RU2826335C1 - Hydraulic system and engineering machine - Google Patents

Abstract

FIELD: hydraulics.

SUBSTANCE: in accordance with the present invention, a hydraulic system and an engineering machine are proposed, wherein the hydraulic system comprises: hydraulic system oil tank; pump station connected to hydraulic system oil tank; first multi-link multi-way valve connected to the pump station; second multi-link multi-way valve connected to the pump station; first reversible hydraulic distribution valve, wherein, when the first reversible hydraulic control valve is in the first position, the first multi-link multi-way valve is connected to the pump station, and when the first reversible hydraulic control valve is in the second position, the first multi-link multi-way valve is connected to the hydraulic system oil tank; a second reversible hydraulic control valve connected to the second multi-link multi-way valve; third reversible hydraulic control valve connected to the second multi-link multi-way valve; a first drive element connected to a second reversible hydraulic control valve and connected to a third reversible hydraulic control valve, wherein, when the second reversible hydraulic control valve is in the first position, and the third reversible hydraulic control valve is in the first position, the first drive element is in the working state; and a second drive element connected to the second reversible hydraulic distribution valve and connected to the third reversible hydraulic distribution valve, wherein when the second reversible hydraulic distribution valve is in the second position and when the third reversible hydraulic distribution valve is in the second position, the second drive element is in working condition.

EFFECT: hydraulic system and engineering machine are disclosed.

10 cl, 3 dwg

Description

[0001] The present invention claims priority under Chinese Patent Application No. 202210896774.1, filed with the National Intellectual Property Administration of China on July 28, 2022, and entitled “HYDRAULIC SYSTEM AND ENGINEERING MACHINE”, which is incorporated herein by reference in its entirety.

AREA OF TECHNOLOGY

[0002] The present invention relates to the field of engineering machine and, in particular, relates to a hydraulic system and an engineering machine.

LEVEL OF TECHNOLOGY

[0003] In the prior art, the sub-beam driven by human physical force often has a relatively low efficiency and is easy to cause injuries in situations such as falling steel beams; the sub-beam driven by a motor must be equipped with a driving or transmission device such as a motor and a screw, and the structure is complex, the flexibility is relatively low, and the precise positioning is relatively difficult to achieve.

DISCLOSURE OF THE ESSENCE OF THE INVENTION

[0004] To solve or improve at least one of the above problems, the object of the present invention is to provide a hydraulic system.

[0005] Another object of the present invention is to provide an engineering machine that comprises the above-mentioned hydraulic system.

[0006] In order to solve the above-mentioned problems, according to the first aspect of the present disclosure, a hydraulic system is proposed, comprising: an oil tank of a hydraulic system; a pump station connected to the oil tank of the hydraulic system; a first multi-link multi-way valve connected to the pump station; a second multi-link multi-way valve connected to the pump station; a first reversible hydraulic distribution valve connected to the first multi-link multi-way valve and further connected to the pump station and the oil tank of the hydraulic system, wherein when the first reversible hydraulic distribution valve is in a first position, the first multi-link multi-way valve communicates with the pump station, and when the first reversible hydraulic distribution valve is in a second position, the first multi-link multi-way valve communicates with the oil tank of the hydraulic system; a second reversible hydraulic distribution valve connected to the second multi-link multi-way valve; a third reversible hydraulic distribution valve connected to the second multi-link multi-way valve; a first drive element connected to the second reversible hydraulic control valve and connected to the third reversible hydraulic control valve, wherein when the second reversible hydraulic control valve is in the first position and the third reversible hydraulic control valve is in the first position, the first drive element is in the working state; and a second drive element connected to the third reversible hydraulic control valve and connected to the second reversible hydraulic control valve, wherein when the second reversible hydraulic control valve is in the second position and when the third reversible hydraulic control valve is in the second position, the second drive element is in the working state.

[0007] According to the embodiments of the hydraulic system proposed in the present disclosure, the driving member is driven by a hydraulic system, and compared with the methods of performing the driving by physical force of a person or a motor, the structure is simple, has high flexibility and is easy to perform accurate positioning, and the efficiency and safety performance can be further improved. The first driving member is used for a tunneling operation, the second driving member is used for a supporting operation; a branch oil channel is further provided on the hydraulic oil channel of the first driving member to control the second driving member and provide a function of switching between the tunneling operation and the supporting operation; when the second driving member is in the working state, the first driving member is in a locked state. In addition, by further providing the first reversible hydraulic distribution valve when performing the supporting operation, the sprocket and the mono-transport motor are in a locked state, and this prevents injury to personnel or damage to equipment due to improper operation.

[0008] In an embodiment, the hydraulic system comprises a hydraulic system oil tank, a pump station, a first multi-link multi-way valve, a second multi-link multi-way valve, a first reversible hydraulic distribution valve, a second reversible hydraulic distribution valve, a third reversible hydraulic distribution valve, a first drive element and a second drive element. The hydraulic system oil tank is a storage container and is configured to store a working medium. The working medium may be a medium such as hydraulic oil. The pump station is connected to the hydraulic system oil tank. The first multi-link multi-way valve is connected to the pump station, and the second multi-link multi-way valve is connected to the pump station. In an embodiment, the pump station comprises at least two pump parts connected to each other, wherein one of the pump parts is used for connection with the first multi-link multi-way valve, wherein the pump part can pump the working medium from the hydraulic system oil tank to the first multi-link multi-way valve, and then by means of the first multi-link multi-way valve the working medium is distributed to the corresponding actuator components; the other pump part is used for connection with the second multi-link multi-way valve, wherein the pump part can pump the working medium from the hydraulic system oil tank to the second multi-link multi-way valve, and then by means of the second multi-link multi-way valve the working medium is distributed to the corresponding actuator components. In an embodiment, the first multi-link multi-way valve is used for connection with the left sprocket motor, the right sprocket motor, the mono-transport motor, etc. The second multi-link multi-way valve is used for connection with the blade plate lifting-lowering drive element, the cutting head lifting-lowering drive element, the cutting head rotation drive element, the cutting head telescopic drive element, the rear support drive element, the left-hand drive element, the right-hand drive element, etc.

[0009] In addition, the first reversible hydraulic distribution valve is connected to the first multi-link multi-way valve. The first reversible hydraulic distribution valve is connected to the pump station. The first reversible hydraulic distribution valve is connected to the oil tank of the hydraulic system. In an embodiment, the first reversible hydraulic distribution valve comprises a first interface, a second interface and a third interface. The first interface of the first reversible hydraulic distribution valve is connected to the first multi-link multi-way valve; the second interface of the first reversible hydraulic distribution valve is connected to the pump station; and the third interface of the first reversible hydraulic distribution valve is connected to the oil tank of the hydraulic system.

[0010] When the first reversible hydraulic distribution valve is in the first position, the first interface is connected to the second interface, and then the first multi-link multi-way valve communicates with the pump station. In an embodiment, the pump station comprises a first pump part and a second pump part, which are connected to each other. The first pump part comprises an oil outlet and an adjustment oil outlet. The first multi-link multi-way valve comprises an oil inlet and a load-sensing oil outlet. The oil outlet of the first pump part is connected to the oil inlet of the first multi-link multi-way valve. The load-sensing oil outlet is connected to the first interface. The second interface is connected to the adjustment oil outlet. When the first reversible hydraulic distribution valve is in the first position, the first interface is connected to the second interface, the feedback oil channel passes sequentially through the load-sensing oil outlet, the first interface, the second interface and the adjustment oil outlet. After the working medium of the feedback oil channel enters the adjustment oil hole, the first pump part can pump the working medium from the hydraulic system oil tank to the first multi-link multi-way valve, and then, using the first multi-link multi-way valve, the working medium is distributed to such drive elements as the left sprocket motor, the right sprocket motor, or the single-transport motor. It should be understood that when the first reversible hydraulic distribution valve is in the first position, the drive elements such as the left sprocket motor, the right sprocket motor, and the single-transport motor are in working condition.

[0011] When the first reversible hydraulic control valve is in the second position, the first multi-link multi-way valve communicates with the hydraulic system oil tank. In an embodiment, when the first reversible hydraulic control valve is in the first position, the first interface is connected to the third interface, the feedback oil channel passes sequentially through the load-sensing oil hole, the first interface, the third interface and the hydraulic system oil tank. The working medium of the feedback oil channel does not enter the adjustment oil hole of the first pump part, and at this moment the first pump part will not pump the working medium to the first multi-link multi-way valve. It should be understood that when the first reversible hydraulic control valve is in the second position, the driving elements such as the left sprocket motor, the right sprocket motor and the mono-transport motor are in a locked state.

[0012] In addition, the second reversible hydraulic control valve is connected to the second multi-link multi-way valve. The third reversible hydraulic control valve is connected to the second multi-link multi-way valve. In an embodiment, the second reversible hydraulic control valve and the third reversible hydraulic control valve are connected to the same link of the second multi-link multi-way valve. In addition, the first drive element is connected to the second reversible hydraulic control valve, and the first drive element is connected to the third reversible hydraulic control valve. In an embodiment, the first drive element is a telescopic drive element of the cutting head; the second drive element is a drive element of the sub-beam. In an embodiment, the first drive element is a first oil cylinder, wherein the first oil cylinder comprises a first rod cavity and a first rodless cavity; the second drive element is a second oil cylinder, wherein the second oil cylinder comprises a second rod cavity and a second rodless cavity. The second reversible hydraulic distribution valve comprises a fourth interface, a fifth interface and a sixth interface. The fourth interface is connected to the second multi-link multi-way valve; the fifth interface is connected to the first rodless cavity; and the sixth interface is connected to the second rodless cavity. The fourth interface is selectively connected to the fifth interface or the sixth interface. When the second reversible hydraulic control valve is in the first position, the fourth interface is connected to the fifth interface, and in this case the second pump part of the pump station can pass the working medium from the oil tank of the hydraulic system sequentially through the second multi-link multi-way valve, the fourth interface and the fifth interface, after which the working medium enters the first rodless cavity; when the second reversible hydraulic control valve is in the second position, the fourth interface is connected to the sixth interface, and in this case the second pump part of the pump station can pass the working medium from the oil tank of the hydraulic system sequentially through the second multi-link multi-way valve, the fourth interface and the sixth interface, after which the working medium enters the second rodless cavity.

[0013] In addition, the second drive element is connected to the third reversible hydraulic control valve, and the second drive element is connected to the second reversible hydraulic control valve. In an embodiment, the third reversible hydraulic control valve comprises a seventh interface, an eighth interface and a ninth interface. The seventh interface is connected to the second multi-link multi-way valve; the eighth interface is connected to the first rod cavity; and the ninth interface is connected to the second rod cavity. The seventh interface is selectively connected to the eighth interface or the ninth interface. When the third reversible hydraulic control valve is in the first position, the seventh interface is connected to the eighth interface, and in this case the second pump part of the pump station can pass the working medium from the oil tank of the hydraulic system sequentially through the second multi-link multi-way valve, the seventh interface and the eighth interface, after which the working medium enters the first rod cavity; when the third reversible hydraulic control valve is in the second position, the seventh interface is connected to the ninth interface, and in this case the second pump part of the pump station can pass the working medium from the oil tank of the hydraulic system sequentially through the second multi-link multi-way valve, the seventh interface and the ninth interface, after which the working medium enters the second rod cavity.

[0014] In other words, when the second reversible hydraulic adjustment valve is in the first position, and the third reversible hydraulic adjustment valve is in the first position, the first drive member is in the operating state. When the second reversible hydraulic adjustment valve is located in the second position, and the third reversible hydraulic adjustment valve is located in the second position, the second drive member is in the operating state.

[0015] In the embodiment proposed in the present disclosure, the driving member is driven by a hydraulic system, and compared with the methods of implementing the driving by physical force of a person or a motor, the structure is simple, has high flexibility and is easy to implement precise positioning, and the efficiency and safety performance can be further improved. The first driving member is used for a tunneling operation, the second driving member is used for a supporting operation; a branch oil channel is further provided on the hydraulic oil channel of the first driving member to control the second driving member and provide a function of switching between the tunneling operation and the supporting operation; when the second driving member is in the working state, the first driving member is in a locked state. In addition, by further providing the first reversible hydraulic distribution valve when performing the supporting operation, the sprocket and the mono-transport motor are in a locked state, and this prevents injury to personnel or damage to equipment due to improper operation.

[0016] Furthermore, the above-described embodiment proposed in the present disclosure further comprises the following additional features:

[0017] In the above embodiment, the first multi-link multi-way valve comprises an oil inlet and a load-sensing oil hole; the first reversible hydraulic adjustment valve comprises a first interface, a second interface and a third interface; the first interface is connected to the load-sensing oil hole, the second interface is connected to the pump station, and the third interface is connected to the oil tank of the hydraulic system; the first interface is configured to selectively connect to the second interface or the third interface; when the first reversible hydraulic adjustment valve is in the first position, the first interface is connected to the second interface; when the first reversible hydraulic adjustment valve is in the second position, the first interface is connected to the third interface.

[0018] In an embodiment, the first interface of the first reversible hydraulic control valve is connected to the load-sensing oil orifice (LS orifice) of the first multi-link multi-way valve; the second interface of the first reversible hydraulic control valve is connected to the regulating oil orifice of the pump station; and the third interface of the first reversible hydraulic control valve is connected to the oil tank of the hydraulic system. When the engineering machine is in the tunneling state, the first reversible hydraulic control valve is in the first position (the first interface is connected to the second interface), the feedback oil channel passes sequentially through the load-sensing oil orifice, the first interface, the second interface and the regulating oil orifice. After the working medium of the feedback oil channel enters the adjustment oil hole, the first pump part can pump the working medium from the hydraulic system oil tank to the first multi-link multi-way valve, and then, using the first multi-link multi-way valve, the working medium is distributed to such driving elements as the left sprocket motor, the right sprocket motor or the single-transport motor. It should be understood that when the first reversible hydraulic distribution valve is in the first position, the driving elements such as the left sprocket motor, the right sprocket motor and the single-transport motor are in the working state; when the engineering machine performs a support operation, the first reversible hydraulic distribution valve is in the second position (the first interface is connected to the third interface), the feedback oil channel passes sequentially through the load-sensing oil hole, the first interface, the third interface and the hydraulic system oil tank. The working medium of the feedback oil channel does not enter the adjustment oil hole of the first pump part, and at this moment, the first pump part will not pump the working medium to the first multi-link multi-way valve. It should be understood that when the first reversible hydraulic distribution valve is in the second position, the driving elements such as the left sprocket motor, the right sprocket motor and the mono-transport motor are in a locked state.

[0019] In the embodiments defined in the present disclosure, the first reversible hydraulic control valve is added to the load-sensing oil feedback passage of the first multi-link multi-way valve to ensure that the sprocket and the mono-transport motor are locked during the supporting operation, which prevents personnel injury and equipment damage due to improper operation. The first reversible hydraulic control valve changes position so that the load-sensing oil passage of the first multi-link multi-way valve changes direction, and the initial return supply to the front pump (the first pump part) of the pump station is changed to return to the oil tank of the hydraulic system; since the plunger pump used in the hydraulic system according to the present disclosure is a load-sensing pump, in the absence of feedback through the load-sensing oil passage, the rotation angle of the swash plate of the front pump is a minimum angle, the front pump does not output a flow; When the guide handles of the sprocket and the single-transport engine are pressed, the sprocket and the single-transport engine do not move, i.e. the sprocket and the single-transport engine are locked when the sub-beam is operating.

[0020] In the above embodiment, the first drive element is a first oil cylinder, wherein the first oil cylinder comprises a first rod cavity and a first rodless cavity; the second drive element is a second oil cylinder, wherein the second oil cylinder comprises a second rod cavity and a second rodless cavity; the second reversible hydraulic control valve comprises a fourth interface, a fifth interface and a sixth interface, wherein the fourth interface is connected to the second multi-link multi-way valve, the fifth interface is connected to the first rodless cavity, and the sixth interface is connected to the second rodless cavity; the fourth interface is configured to be selectively connected to the fifth interface or the sixth interface, when the second reversible hydraulic control valve is in the first position, the fourth interface is connected to the fifth interface; when the second reversible hydraulic control valve is in the second position, the fourth interface is connected to the sixth interface; the third reversible hydraulic control valve comprises a seventh interface, an eighth interface and a ninth interface; the seventh interface is connected to the second multi-link multi-way valve; the eighth interface is connected to the first rod cavity; and the ninth interface is connected to the second rod cavity; the seventh interface is configured to selectively connect to the eighth interface or the ninth interface; when the third reversible hydraulic distribution valve is in the first position, the seventh interface is connected to the eighth interface; and when the third reversible hydraulic distribution valve is in the second position, the seventh interface is connected to the ninth interface.

[0021] In an embodiment, when the second reversible hydraulic control valve is in the first position (the fourth interface is connected to the fifth interface), the second pump part of the pump station can pass the working medium from the oil tank of the hydraulic system sequentially through the second multi-link multi-way valve, the fourth interface and the fifth interface, and then the working medium enters the first rodless cavity; when the second reversible hydraulic control valve is in the second position (the fourth interface is connected to the sixth interface), the second pump part of the pump station can pass the working medium from the oil tank of the hydraulic system sequentially through the second multi-link multi-way valve, the fourth interface and the sixth interface, and then the working medium enters the second rodless cavity. When the third reversible hydraulic adjustment valve is in the first position (the seventh interface is connected to the eighth interface), the second pump part of the pumping station can pass the working medium from the hydraulic system oil tank sequentially through the second multi-link multi-way valve, the seventh interface and the eighth interface, and then the working medium enters the first rod cavity; when the third reversible hydraulic adjustment valve is in the second position (the seventh interface is connected to the ninth interface), the second pump part of the pumping station can pass the working medium from the hydraulic system oil tank sequentially through the second multi-link multi-way valve, the seventh interface and the ninth interface, and then the working medium enters the second rod cavity.

[0022] In other words, when the second reversible hydraulic adjustment valve is in the first position, and the third reversible hydraulic adjustment valve is in the first position, the first drive member is in the operating state. When the second reversible hydraulic adjustment valve is in the second position, and the third reversible hydraulic adjustment valve is in the second position, the second drive member is in the operating state.

[0023] In the above embodiment, the sixth interface is connected to the second rodless cavity through the first fluid passageway, and the hydraulic system further comprises a group of speed control valves that are located in the first fluid passageway.

[0024] In the embodiment, the second multi-link multi-way valve is a pressure-reducing valve and can regulate the moving speed of the driving element, but the pressure and flow rate of the multi-way valve are set in advance, and thus the speed control range of the second driving element has certain limitations, which cannot satisfy the requirement of accurate positioning of the sub-beam after it has moved to the working position. Due to the additional provision of a group of speed control valves, the oil passage of the oil cylinder of the sub-beam can be significantly reduced, and thus the oil cylinder of the sub-beam can ensure real-time speed control even at a lower pressure and flow rate, and accurate positioning of the sub-beam can be further ensured after it has moved to a position close to the working position.

[0025] In the above embodiment, the group of speed control valves comprises: a manual reversing valve that comprises a tenth interface, an eleventh interface and a twelfth interface, wherein the tenth interface is connected to the sixth interface, the eleventh interface is connected to the sixth interface, the twelfth interface is connected to the second rodless cavity, the twelfth interface is configured to selectively connect to the tenth interface or the eleventh interface; a throttle valve located on the eleventh interface, and when the twelfth interface is connected to the tenth interface, the working medium sequentially passes through the sixth interface, the tenth interface, the twelfth interface and the second rodless cavity; when the twelfth interface is connected to the eleventh interface, the working medium sequentially passes through the sixth interface, the throttle valve, the eleventh interface, the twelfth interface and the second rodless cavity.

[0026] In an embodiment, the group of speed control valves comprises a manual reversing valve and a throttle valve. In an embodiment, the manual reversing valve comprises a tenth interface, an eleventh interface and a twelfth interface. The tenth interface of the manual reversing valve is connected to the sixth interface of the second reversing hydraulic control valve; the eleventh interface of the manual reversing valve is connected to the sixth interface of the second reversing hydraulic control valve; and the twelfth interface of the manual reversing valve is connected to the second rodless cavity. The throttle valve is located on the eleventh interface of the manual reversing valve. The twelfth interface is configured to be selectively connected to the tenth interface or the eleventh interface.

[0027] In the embodiment, when the manual reversing valve is in the left position, the twelfth interface is connected to the tenth interface, the working medium sequentially passes through the sixth interface, the tenth interface, the twelfth interface and the second rodless cavity, and then the moving speed of the second drive member can be adjusted by controlling the opening of the handle unit; when the manual reversing valve is in the right position, the twelfth interface is connected to the eleventh interface, the working medium sequentially passes through the sixth interface, the throttle valve, the eleventh interface, the twelfth interface and the second rodless cavity, and since the oil passage is provided with a throttle valve, the throttle valve performs throttling, the low-speed operation mode can be switched by moving the manual reversing valve to the right position. By this method, the oil passage of the second drive element can be significantly reduced, and thus the second drive element can perform real-time speed adjustment even at a lower pressure and flow rate, and accurate positioning of the sub-beam can be further ensured after it is moved to a position close to the working position.

[0028] In the above embodiment, the first multi-link multi-way valve comprises a first oil hole of the control circuit, the second multi-link multi-way valve comprises a second oil hole of the control circuit, and the hydraulic system further comprises: a shuttle valve connected to the first oil hole of the control circuit, wherein the shuttle valve is connected to the second oil hole of the control circuit; a handle assembly connected to the shuttle valve; a retractable valve connected to the shuttle valve, wherein the retractable valve is connected to the first reversible hydraulic distribution valve, the retractable valve is connected to the second reversible hydraulic distribution valve, and the retractable valve is connected to the third reversible hydraulic distribution valve.

[0029] In an embodiment, the hydraulic system further comprises a shuttle valve, a handle assembly, and a retractable valve. In an embodiment, the first multi-link multi-way valve comprises a first oil hole of the control circuit (X-port), and the second multi-link multi-way valve comprises a second oil hole of the control circuit (X-port). The shuttle valve is connected to the first oil hole of the control circuit, and the shuttle valve is connected to the second oil hole of the control circuit. In an embodiment, by arranging the shuttle valve, a pressure selection function can be provided, and a working medium with a higher pressure is selected for passage. In addition, the handle assembly is connected to the shuttle valve. In an embodiment, the handle assembly comprises a guide handle and a four-position handle, which are connected to each other. The guide handle is configured to control the forward and backward movements of the left-hand stroke driving element; the guide handle is configured to control the forward and backward movements of the right-hand stroke driving element; the guide handle is configured to control the extension and retraction of the rear support drive element; the guide handle is configured to control the lowering and raising of the blade plate lifting-lowering drive element; the guide handle is configured to control the forward and backward rotation of the monotransport motor; and the guide handle is configured to control the forward and backward rotation of the sprocket motor. In addition, the four-position handle is configured to control the lifting and lowering of the cutting head lifting-lowering drive element; and the four-position handle is configured to control the left and right rotation of the cutting head rotation drive element. In addition, the retractable valve is connected to the shuttle valve, the retractable valve is connected to the first reversible hydraulic distribution valve, the retractable valve is connected to the second reversible hydraulic distribution valve, and the retractable valve is connected to the third reversible hydraulic distribution valve. The pop-up valve controls the opening and closing of the oil channel of the control circuit, when the position of the pop-up valve changes, the first reversible hydraulic control valve, the second reversible hydraulic control valve and the third reversible hydraulic control valve can return to their original positions.

[0030] In the above embodiment, the hydraulic system further comprises a balancing valve connected to the second reversible hydraulic control valve and further connected to the first drive element; and/or the balancing valve is connected to the third reversible hydraulic control valve, and the balancing valve is connected to the second drive element.

[0031] In an embodiment, by arranging the equalizing valve, the purpose of changing the resistance to the flow passing through the valve can be achieved to adjust the flow rate. Generally, the medium has a relatively large pressure difference or flow rate difference, when the medium is located in the corresponding parts of the pipe or container, the equalizing valve can reduce or balance the pressure difference, and it is used to adjust the relative pressure balance on both sides or achieve flow balance by diverting the flow.

[0032] In the above embodiment, the handle assembly comprises a guide handle and a four-position handle, which are connected to each other.

[0033] In the above embodiment, the guide handle is configured to control the forward and backward movements of the left-hand drive element; the guide handle is configured to control the forward and backward movements of the right-hand drive element; the guide handle is configured to control the extension and retraction of the rear support drive element; the guide handle is configured to control the lowering and raising of the blade plate lifting-lowering drive element; the guide handle is configured to control the forward and backward rotation of the monotransport motor; and the guide handle is configured to control the forward and backward rotation of the sprocket motor. The four-position handle is configured to control the lifting and lowering of the cutting head lifting-lowering drive element; and the four-position handle is configured to control the left and right rotation of the cutting head rotation drive element.

[0034] In the above embodiment, the pumping station comprises at least two pumping parts that are connected to each other, wherein at least one pumping part is connected to the first multi-link multi-way valve, and the pumping part is connected to the first reversible hydraulic control valve; and at least one pumping part is connected to the second multi-link multi-way valve.

[0035] In an embodiment, the pump station comprises at least two pump parts connected to each other, wherein the number of pump parts is at least two, i.e. there may be two or a plurality of pump parts, and the arrangement of the pump parts may be flexible in accordance with actual needs. At least one pump part is connected to a first multi-link multi-way valve, and the pump part is connected to a first reversible hydraulic adjustment valve; and at least one pump part is connected to a second multi-link multi-way valve. In an embodiment, the pump station comprises a first pump part and a second pump part, which are connected to each other. The first pump part comprises an oil outlet and an adjustment oil outlet. The first multi-link multi-way valve comprises an oil inlet and a load-sensing oil outlet. The oil outlet of the first pump part is connected to the oil inlet of the first multi-link multi-way valve. The load-sensitive oil hole is connected to the first interface. The second interface is connected to the adjustment oil hole of the first pump part. When the first reversible hydraulic distribution valve is in the first position, the first interface is connected to the second interface, the feedback oil channel passes sequentially through the load-sensitive oil hole, the first interface, the second interface and the adjustment oil hole. After the working medium of the feedback oil channel enters the adjustment oil hole, the first pump part can pump the working medium from the hydraulic system oil tank to the first multi-link multi-way valve, and then, using the first multi-link multi-way valve, the working medium is distributed to such drive elements as the left sprocket motor, the right sprocket motor or the mono-transport engine. In addition, the second pump part can pump the working medium from the hydraulic system oil tank to the second multi-link multi-way valve, and then, using the second multi-link multi-way valve, the working medium is distributed to the drive elements.

[0036] According to a second aspect of the present disclosure, there is provided an engineering machine comprising: a hydraulic system according to any of the above embodiments; and a sub-beam connected to a second drive element of the hydraulic system.

[0037] According to an embodiment of the engineering machine according to the present disclosure, the engineering machine comprises a hydraulic system and a sub-bar according to any of the above embodiments. The sub-bar is connected to a second drive element of the hydraulic system. In an embodiment, the engineering machine further comprises a cutting unit, a sprocket motor and a mono-transport motor. The cutting unit is connected to the first drive element; the sprocket motor is connected to the first multi-link multi-way valve; and the mono-transport motor is connected to the first multi-link multi-way valve.

[0038] It should be noted that an engineering machine may be equipment such as a tunneling machine.

[0039] Furthermore, the engineering machine comprises any of the hydraulic systems according to the above-described first aspect, and thus has the advantageous effects of any of the above embodiments, which are not repeated here.

[0040] Additional aspects and advantages of embodiments of the present disclosure will be apparent from the following description or may be learned by practice of the present disclosure.

BRIEF DESCRIPTION OF DRAWINGS

[0041] Fig. 1 is a schematic view of a hydraulic system in accordance with an embodiment of the present disclosure;

[0042] Fig. 2 is a schematic view of a speed control valve group in accordance with an embodiment of the present disclosure; and

[0043] Fig. 3 is a schematic view of an engineering machine in accordance with an embodiment of the present disclosure.

[0044] In this case, the corresponding relationship between the reference positions in Fig. 1 - Fig. 3 and the names of the elements is as follows:

[0045] 100 - hydraulic system, 111 - hydraulic system oil tank, 112 - pump station, 1121 - first pump part, 1122 - second pump part, 121 - first multi-link multi-way valve, 1211 - oil inlet, 1212 - load-sensing oil hole, 1213 - first control circuit oil hole, 122 - second multi-link multi-way valve, 1221 - second control circuit oil hole, 131 - first reversible hydraulic distribution valve, 1311 - first interface, 1312 - second interface, 1313 - third interface, 132 - second reversible hydraulic distribution valve, 1321 - fourth interface, 1322 - fifth interface, 1323 - sixth interface, 133 - third reversible hydraulic distribution valve, 1331 - seventh interface, 1332 - eighth interface, 1333 - ninth interface, 141 - first driving element, 1411 - first rod cavity; 1412 - first rodless cavity, 142 - second driving element, 1421 - second rod cavity, 1422 - second rodless cavity, 150 - speed control valve group; 151 - manual reversing valve, 1511 - tenth interface, 1512 - eleventh interface, 1513 - twelfth interface, 152 - throttle valve, 161 - shuttle valve, 162 - pop-up valve, 163 - equalizing valve, 170 - handle unit, 171 - guide handle; 172 - four-position handle; 181 - first channel for passage of fluid medium; 200 - engineering machine; 210 - sub-beam.

IMPLEMENTATION OF THE INVENTION

[0046] For a more clear understanding of the above-stated objects, features and advantages of the embodiments of the present disclosure, the embodiments of the present disclosure are described in more detail below in conjunction with the accompanying drawings and implementation methods. It should be noted that, in the absence of contradictions, the embodiments and features of the embodiments of the present disclosure can be combined with each other.

[0047] Many details in the following description are shown for the convenience of a complete understanding of the present disclosure, but embodiments of the present disclosure may be further implemented using methods other than those described herein. Therefore, the scope of protection of the present disclosure is not limited to the embodiments disclosed in the following text.

[0048] With reference to Fig. 1 - Fig. 3, a hydraulic system 100 and an engineering machine 200 proposed by some embodiments of the present disclosure are described below.

[0049] Variant 1 of the invention:

[0050] As shown in Fig. 1, according to an embodiment of the present disclosure, a hydraulic system 100 is proposed, comprising: a hydraulic system oil tank 111, a pump station 112, a first multi-link multi-way valve 121, a second multi-link multi-way valve 122, a first reversible hydraulic control valve 132, a third reversible hydraulic control valve 133, a first drive element 141 and a second drive element 142. The hydraulic system oil tank 111 is a storage container and is configured to store a working medium. The working medium may be a medium such as hydraulic oil. The pump station 112 is connected to the hydraulic system oil tank 111. The first multi-link multi-way valve 121 is connected to the pump station 112, and the second multi-link multi-way valve 122 is connected to the pump station 112. In an embodiment, the pump station 112 comprises at least two pump parts connected to each other, wherein one of the pump parts is used for connection with the first multi-link multi-way valve 121, wherein the pump part can pump the working medium from the oil tank 111 of the hydraulic system to the first multi-link multi-way valve 121, and then, using the first multi-link multi-way valve 121, the working medium is distributed to the corresponding actuator components; the other pump part is used for connection with the second multi-link multi-way valve 122, wherein the pump part can pump the working medium from the oil tank 111 of the hydraulic system to the second multi-link multi-way valve 122, and then by means of the second multi-link multi-way valve 122 the working medium is distributed to the corresponding actuator components. In the embodiment, the first multi-link multi-way valve 121 is used for connection with the left sprocket motor, the right sprocket motor, the mono-transport motor, etc. The second multi-link multi-way valve 122 is used for connection with the blade plate lifting-lowering drive element, the cutting head lifting-lowering drive element, the cutting head rotation drive element, the cutting head telescopic drive element, the rear support drive element, the left-hand stroke drive element, the right-hand stroke drive element, etc.

[0051] In addition, the first reversible hydraulic distribution valve 131 is connected to the first multi-link multi-way valve 121. The first reversible hydraulic distribution valve 131 is connected to the pump station 112. The first reversible hydraulic distribution valve 131 is connected to the oil tank 111 of the hydraulic system. In an embodiment, the first reversible hydraulic distribution valve 131 comprises a first interface 1311, a second interface 1312 and a third interface 1313. The first interface 1311 of the first reversible hydraulic distribution valve 131 is connected to the first multi-link multi-way valve 121; the second interface 1312 of the first reversible hydraulic distribution valve 131 is connected to the pump station 112; and the third interface 1313 of the first reversible hydraulic distribution valve 131 is connected to the oil tank 111 of the hydraulic system.

[0052] When the first reversible hydraulic distribution valve 131 is in the first position, the first interface 1311 is connected to the second interface 1312, and then the first multi-link multi-way valve 121 communicates with the pump station 112. In an embodiment, the pump station 112 comprises a first pump part 1121 and a second pump part 1122, which are connected to each other. The first pump part 1121 comprises an oil outlet hole and an oil adjustment hole. The first multi-link multi-way valve 121 comprises an oil inlet 1211 and a load-sensing oil outlet 1212. The oil outlet of the first pump part 1121 is connected to the oil inlet 1211 of the first multi-link multi-way valve 121. The load-sensing oil outlet 1212 is connected to the first interface 1311. The second interface 1312 is connected to the regulating oil outlet. When the first reversible hydraulic distribution valve 131 is in the first position, the first interface 1311 is connected to the second interface 1312, the feedback oil channel passes sequentially through the load-sensing oil outlet 1212, the first interface 1311, the second interface 1312 and the regulating oil outlet. After the working medium of the feedback oil channel enters the adjustment oil hole, the first pump part 1121 can pump the working medium from the oil tank 111 of the hydraulic system to the first multi-link multi-way valve 121, and then, using the first multi-link multi-way valve 121, the working medium is distributed to such drive elements as the left sprocket motor, the right sprocket motor, or the single-transport motor. It should be understood that when the first reversible hydraulic distribution valve 131 is in the first position, the drive elements such as the left sprocket motor, the right sprocket motor, and the single-transport motor are in the working state.

[0053] When the first reversible hydraulic control valve 131 is in the second position, the first multi-link multi-way valve 121 communicates with the oil tank 111 of the hydraulic system. In an embodiment, when the first reversible hydraulic control valve 131 is in the first position, the first interface 1311 is connected to the third interface 1313, the oil feedback channel passes sequentially through the load-sensing oil hole 1212, the first interface 1311, the third interface 1313 and the oil tank 111 of the hydraulic system. The working medium of the feedback oil channel does not enter the adjustment oil hole of the first pump part 1121, and at this moment the first pump part 1121 will not pump the working medium to the first multi-link multi-way valve 121. It should be understood that when the first reversible hydraulic distribution valve 131 is in the second position, the drive elements, such as the left sprocket motor, the right sprocket motor and the mono-transport motor, are in a locked state.

[0054] In addition, the second reversible hydraulic control valve 132 is connected to the second multi-link multi-way valve 122. The third reversible hydraulic control valve 133 is connected to the second multi-link multi-way valve 122. In an embodiment, the second reversible hydraulic control valve 132 and the third reversible hydraulic control valve 133 are connected to the same link of the second multi-link multi-way valve 122. In addition, the first drive element 141 is connected to the second reversible hydraulic control valve 132, and the first drive element 141 is connected to the third reversible hydraulic control valve 133. In an embodiment, the first drive element 141 is a telescopic drive element of the cutting head; the second drive element 142 is a drive element of the sub-beam. In an embodiment, the first drive element 141 is a first oil cylinder, wherein the first oil cylinder comprises a first rod cavity 1411 and a first rodless cavity 1412; the second drive element 142 is a second oil cylinder, wherein the second oil cylinder comprises a second rod cavity 1421 and a second rodless cavity 1422. The second reversible hydraulic distribution valve 132 comprises a fourth interface 1321, a fifth interface 1322 and a sixth interface 1323. The fourth interface 1321 is connected to the second multi-link multi-way valve 122; the fifth interface 1322 is connected to the first rodless cavity 1412; and the sixth interface 1323 is connected to the second rodless cavity 1422. The fourth interface 1321 is selectively connected to the fifth interface 1322 or the sixth interface 1323. When the second reversible hydraulic control valve 132 is in the first position, the fourth interface 1321 is connected to the fifth interface 1322, and in this case the second pump part 1122 of the pump station 112 can pass the working medium from the oil tank 111 of the hydraulic system sequentially through the second multi-link multi-way valve 122, the fourth interface 1321 and the fifth interface 1322, after which the working medium enters the first rodless cavity 1412; when the second reversible hydraulic control valve 132 is in the second position, the fourth interface 1321 is connected to the sixth interface 1323, and in this case the second pump part 1122 of the pump station 112 can pass the working medium from the oil tank 111 of the hydraulic system sequentially through the second multi-link multi-way valve 122, the fourth interface 1321 and the sixth interface 1323, after which the working medium enters the second rodless cavity 1422.

[0055] In addition, the second actuator 142 is connected to the third reversible hydraulic control valve 133, and the second actuator 141 is connected to the second reversible hydraulic control valve 132. In an embodiment, the third reversible hydraulic control valve 133 comprises a seventh interface 1331, an eighth interface 1332 and a ninth interface 1333. The seventh interface 1321 is connected to the second multi-link multi-way valve 122; the eighth interface 1332 is connected to the first rod cavity 1411; and the ninth interface 1333 is connected to the second rod cavity 1421. The seventh interface 1331 is selectively connected to the eighth interface 1332 or the ninth interface 1333. When the third reversible hydraulic control valve 133 is in the first position, the seventh interface 1331 is connected to the eighth interface 1332, and in this case the second pump part 1122 of the pump station 112 can pass the working medium from the oil tank 111 of the hydraulic system sequentially through the second multi-link multi-way valve 122, the seventh interface 1331 and the eighth interface 1332, after which the working medium enters the first rod cavity 1411; when the third reversible hydraulic control valve 133 is in the second position, the seventh interface 1331 is connected to the ninth interface 1333, and in this case the second pump part 1122 of the pump station 112 can pass the working medium from the oil tank 111 of the hydraulic system sequentially through the second multi-link multi-way valve 122, the seventh interface 1331 and the ninth interface 1333, after which the working medium enters the second rod cavity 1421.

[0056] In other words, when the second reversible hydraulic adjustment valve 132 is in the first position, and the third reversible hydraulic adjustment valve 133 is in the first position, the first drive member 141 is in the operating state. When the second reversible hydraulic adjustment valve 132 is in the second position, and the third reversible hydraulic adjustment valve 133 is in the second position, the second drive member 142 is in the operating state.

[0057] In the embodiment proposed in the present invention, the driving member is driven by a hydraulic system 100, and compared with the driving methods by physical force of a person or a motor, the structure is simple, has high flexibility and is easy to perform accurate positioning, and the efficiency and safety performance can be further improved. The first driving member 141 is used for a tunneling operation, the second driving member 142 is used for a supporting operation; a branch oil passage is further provided on the hydraulic oil passage of the first driving member 141 for controlling the second driving member 142 and providing a function of switching between the tunneling operation and the supporting operation; when the second driving member 142 is in the operating state, the first driving member 141 is in a locked state. In addition, by further providing the first reversible hydraulic distribution valve 131, when the supporting operation is performed, the star and mono-transport motor are in a locked state, and this prevents injury to personnel or damage to equipment due to improper operation.

[0058] In another embodiment, the first multi-link multi-way valve is a three-link multi-way valve. By using a three-link multi-way valve as the first multi-link multi-way valve, said first multi-link multi-way valve can be connected to a left sprocket motor, a right sprocket motor, a mono-transport motor, etc.

[0059] In another embodiment, the second multi-link multi-way valve is a seven-link multi-way valve. The second multi-link multi-way valve is used to connect with a blade plate lifting-lowering drive element, a cutting head lifting-lowering drive element, a cutting head rotation drive element, a cutting head telescopic drive element, a rear support drive element, a left-hand stroke drive element, a right-hand stroke drive element, etc.

[0060] Variant 2 of the invention:

[0061] As shown in Fig. 1, the first interface 1311 of the first reversible hydraulic distribution valve 131 is connected to the load-sensing oil hole 1212 (LS hole) of the first multi-link multi-way valve 121; the second interface 1312 of the first reversible hydraulic distribution valve 131 is connected to the regulating oil hole of the pump station 112; and the third interface 1313 of the first reversible hydraulic distribution valve 131 is connected to the oil tank 111 of the hydraulic system. When the engineering machine 200 is in the tunneling state, the first reversible hydraulic distribution valve 131 is in the first position (the first interface 1311 is connected to the second interface 1312), the feedback oil channel passes sequentially through the load-sensitive oil hole 1212, the first interface 1311, the second interface 1312 and the adjustment oil hole. After the working medium of the feedback oil channel enters the adjustment oil hole, the first pump part 1121 can pump the working medium from the oil tank 111 of the hydraulic system to the first multi-link multi-way valve 121, and then, by means of the first multi-link multi-way valve 121, the working medium is distributed to such drive elements as the left sprocket motor, the right sprocket motor or the mono-transport motor. It should be understood that when the first reversible hydraulic distribution valve 131 is in the first position, the drive elements such as the left sprocket motor, the right sprocket motor and the mono-transport motor are in the working state; when the engineering machine 200 performs a support operation, the first reversible hydraulic distribution valve 131 is in the second position (the first interface 1311 is connected to the third interface 1313), the feedback oil channel passes sequentially through the load-sensitive oil hole 1212, the first interface 1311, the third interface 1313 and the oil tank 111 of the hydraulic system. The working medium of the feedback oil channel does not enter the adjustment oil hole of the first pump part 1121, and at this moment the first pump part 1121 will not pump the working medium to the first multi-link multi-way valve 121. It should be understood that when the first reversible hydraulic distribution valve 131 is in the second position, the drive elements, such as the left sprocket motor, the right sprocket motor and the mono-transport motor, are in a locked state.

[0062] In the embodiments defined in the present disclosure, the first reversible hydraulic control valve 131 is added to the load-sensing oil feedback passage of the first multi-link multi-way valve 121 to ensure that the sprocket and the mono-transport motor are locked during the supporting operation, which prevents personal injury and equipment damage due to improper operation. The first reversible hydraulic control valve 131 changes position so that the load-sensing oil passage of the first multi-link multi-way valve 121 changes direction, and the original return feed to the front pump (first pump part 1121) of the pump station 112 changes to a return to the oil tank 111 of the hydraulic system; Since the plunger pump used in the hydraulic system 100 according to the present disclosure is a load-sensing pump, when there is no feedback through the load-sensing oil passage, the rotation angle of the swash plate of the front pump is the minimum angle, the front pump does not output flow; when the guide handles 171 of the sprocket and the mono-transport motor are pressed, the sprocket and the mono-transport motor do not move, that is, the sprocket and the mono-transport motor are locked when the sub-beam 210 operates.

[0063] Variant 3 of the invention:

[0064] As shown in Fig. 1, when the second reversible hydraulic control valve 132 is in the first position (the fourth interface 1321 is connected to the fifth interface 1322), the second pump part 1122 of the pump station 112 can pass the working medium from the oil tank 111 of the hydraulic system sequentially through the second multi-link multi-way valve 122, the fourth interface 1321 and the fifth interface 1322, after which the working medium enters the first rodless cavity 1412; when the second reversible hydraulic control valve 132 is in the second position (the fourth interface 1321 is connected to the sixth interface 1323), the second pump part 1122 of the pump station 112 can pass the working medium from the oil tank 111 of the hydraulic system sequentially through the second multi-link multi-way valve 122, the fourth interface 1321 and the sixth interface 1323, after which the working medium enters the second rodless cavity 1422. When the third reversible hydraulic control valve 133 is in the first position (the seventh interface 1331 is connected to the eighth interface 1332), the second pump part 1122 of the pump station 112 can pass the working medium from the oil tank 111 of the hydraulic system sequentially through the second multi-link multi-way valve 122, the seventh interface 1331 and the eighth interface 1332, after which the working medium enters the first rod cavity 1411; and when the third reversible hydraulic control valve 133 is in the second position (the seventh interface 1331 is connected to the ninth interface 1333), the second pump part 1122 of the pump station 112 can pass the working medium from the oil tank 111 of the hydraulic system sequentially through the second multi-link multi-way valve 122, the seventh interface 1331 and the ninth interface 1333, after which the working medium enters the second rod cavity 1421.

[0065] In other words, when the second reversible hydraulic adjustment valve 132 is in the first position, and the third reversible hydraulic adjustment valve 133 is in the first position, the first drive member 141 is in the operating state. When the second reversible hydraulic adjustment valve 132 is in the second position, and the third reversible hydraulic adjustment valve 133 is in the second position, the second drive member 142 is in the operating state.

[0066] Variant 4 of the invention:

[0067] As shown in Fig. 1 and Fig. 2, the hydraulic system 100 further comprises a group 150 of speed control valves. In the embodiment, the sixth interface 1323 is connected to the second rodless cavity 1422 through the first fluid passage 181, and the group 150 of speed control valves is located in the first fluid passage 181. The second multi-link multi-way valve 122 is a pressure-reducing valve and can regulate the speed of movement of the driving element, but the pressure and flow rate of the multi-way valve are set in advance, and thus the speed control range of the second driving element 142 has certain limitations, which cannot satisfy the requirement of precise positioning of the sub-beam 210 after it has moved to the working position. Due to the additional provision of the group of speed control valves 150, the oil passage of the oil cylinder of the sub-beam can be significantly lowered, and thus the oil cylinder of the sub-beam can provide real-time speed control even at a lower pressure and flow rate, and accurate positioning of the sub-beam 210 can be further ensured after it has moved to a position close to the working position.

[0068] In addition, the group 150 of speed control valves comprises a manual reversing valve 151 and a throttle valve 152. In an embodiment, the manual reversing valve 151 comprises a tenth interface 1511, an eleventh interface 1512 and a twelfth interface 1513. The tenth interface 1511 of the manual reversing valve 151 is connected to the sixth interface 1323 of the second reversing hydraulic control valve 132; the eleventh interface 1512 of the manual reversing valve 151 is connected to the sixth interface 1323 of the second reversing hydraulic control valve 132; and the twelfth interface 1513 of the manual reversing valve 151 is connected to the second rodless cavity 1422. The throttle valve 152 is located on the eleventh interface 1512 of the manual reversing valve 151. The twelfth interface 1513 is selectively connected to the tenth interface 1511 or the eleventh interface 1512.

[0069] In an embodiment, when the manual reversing valve 151 is in the left position, the twelfth interface 1513 is connected to the tenth interface 1511, the working medium sequentially passes through the sixth interface 1323, the tenth interface 1511, the twelfth interface 1513 and the second rodless cavity 1422, and then the speed of movement of the second drive element 142 can be adjusted by controlling the opening of the handle assembly 170; when the manual reversing valve 151 is in the right position, the twelfth interface 1513 is connected to the eleventh interface 1512, the working medium passes sequentially through the sixth interface 1323, the throttle valve 152, the eleventh interface 1512, the twelfth interface 1513 and the second rodless cavity 1422, and since the oil channel is provided with the throttle valve 152, the throttle valve 152 performs throttling, and the low-speed operation mode can be switched by moving the manual reversing valve 151 to the right position. By this method, the oil passage of the second driving element 142 can be significantly lowered, and thus the second driving element 142 can perform real-time speed adjustment even at a lower pressure and flow rate, and the precise positioning of the sub-beam 210 can be further ensured after it has been moved to a position close to the working position. [0070] Embodiment 5 of the invention:

[0071] As shown in Fig. 1, the hydraulic system 100 further comprises a shuttle valve 161, a handle assembly 170, and a retractable valve 162. In an embodiment, the first multi-link multi-way valve 121 comprises a first oil hole 1213 of the control circuit (X-port), and the second multi-link multi-way valve 122 comprises a second oil hole 1221 of the control circuit (X-port). The shuttle valve 161 is connected to the first oil hole 1213 of the control circuit, and the shuttle valve 161 is connected to the second oil hole 1221 of the control circuit. In an embodiment, by arranging the shuttle valve 161, a pressure selection function can be provided, and a working medium with a higher pressure is selected for passing. In addition, the handle assembly 170 is connected to the shuttle valve 161. In an embodiment, the handle assembly 170 comprises a guide handle 171 and a four-position handle 172, which are connected to each other. The guide handle 171 is configured to control the forward and backward movements of the left-hand drive element; the guide handle 171 is configured to control the forward and backward movements of the right-hand drive element; the guide handle 171 is configured to control the extension and retraction of the rear support drive element; the guide handle 171 is configured to control the lowering and lifting of the blade plate lifting-lowering drive element; the guide handle 171 is configured to control the forward and backward rotation of the monotransport motor; and the guide handle 171 is configured to control the forward and backward rotation of the sprocket motor. In addition, the four-position handle 172 is configured to control the lifting and lowering of the driving element for lifting and lowering the cutting head; and the four-position handle 172 is configured to control the left and right rotation of the driving element for turning the cutting head. In addition, the retractable valve 162 is connected to the shuttle valve 161, the retractable valve 162 is connected to the first reversible hydraulic distribution valve 131, the retractable valve 162 is connected to the second reversible hydraulic distribution valve 132, and the retractable valve 162 is connected to the third reversible hydraulic distribution valve 133. The retractable valve 162 controls the opening and closing of the oil channel of the control circuit, when the position of the retractable valve 162 changes, the first reversible hydraulic distribution valve 131, the second reversible hydraulic distribution valve 132 and the third reversible hydraulic distribution valve 133 can return to their original positions.

[0072] In addition, the hydraulic system 100 further comprises a balancing valve 163. In an embodiment, the balancing valve 163 is connected to the second reversible hydraulic adjustment valve 132 and is further connected to the first driving element 141; and/or the balancing valve 163 is connected to the third reversible hydraulic adjustment valve 133, and the balancing valve 163 is connected to the second driving element 142. By arranging the balancing valve 163, the purpose of changing the resistance to the flow passing through the valve can be achieved to adjust the flow rate. Typically, the medium has a relatively large pressure difference or flow rate difference, when the medium is located in the corresponding parts of the pipe or container, the balancing valve 163 can reduce or balance the pressure difference, and it is used to adjust the relative pressure equilibrium on both sides or achieve flow equilibrium by diverting the flow.

[0073] Embodiment 6 of the invention:

[0074] As shown in Fig. 1, the pump station 112 comprises at least two pump parts connected to each other, wherein the number of the pump parts is at least two, i.e. there may be two or a plurality of pump parts, and the arrangement of the pump parts may be flexible according to actual needs. At least one pump part is connected to the first multi-link multi-way valve 121, and the pump part is connected to the first reversible hydraulic adjustment valve 131; and at least one pump part is connected to the second multi-link multi-way valve 122. In an embodiment, the pump station 112 comprises a first pump part 1121 and a second pump part 1122, which are connected to each other. The first pump part 1121 comprises an oil outlet and an adjustment oil outlet. The first multi-link multi-way valve 121 comprises an oil inlet 1211 and a load-sensing oil outlet 1212. The oil outlet of the first pump part 1121 is connected to the oil inlet 1211 of the first multi-link multi-way valve 121. The load-sensing oil outlet 1212 is connected to the first interface 1311. The second interface 1312 is connected to the adjustment oil outlet of the first pump part 1121. When the first reversible hydraulic distribution valve 131 is in the first position, the first interface 1311 is connected to the second interface 1312, the feedback oil channel passes sequentially through the load-sensing oil outlet 1212, the first interface 1311, the second interface 1312 and the adjustment oil outlet. After the working medium of the feedback oil channel enters the adjustment oil hole, the first pump part 1121 can pump the working medium from the oil tank 111 of the hydraulic system to the first multi-link multi-way valve 121, and then, using the first multi-link multi-way valve 121, the working medium is distributed to such drive elements as the left sprocket motor, the engine or the mono-transport motor. In addition, the second pump part 1122 can pump the working medium from the oil tank 111 of the hydraulic system to the second multi-link multi-way valve 122, and then, using the second multi-link multi-way valve 122, the working medium is distributed to the drive elements.

[0075] Variant 7 of the invention:

[0076] As shown in Fig. 1 and Fig. 2, the hydraulic system 100 proposed in accordance with the present disclosure can provide an interconnection between the support operation and the tunneling operation. In the embodiment, when the sub-cylinder 210 is for carrying out the supporting operation, through the X-ports (control circuit oil holes) of the seven-link multi-way valve (the second multi-link multi-way valve 122) and the three-link multi-way valve (the first multi-link multi-way valve 121), the control circuit oil source is subjected to the pressure value selection process carried out by the shuttle valve 161 and then guided in parallel to the guide handle 171, the four-way handle 172 and the sliding valve 162. By extending the sliding valve 162, which has a positioning function, the control oil passages of the reversible hydraulic distribution valves (comprising the first reversible hydraulic distribution valve 131, the second reversible hydraulic distribution valve 132 and the third reversible hydraulic distribution valve 133) can communicate with the X-ports of the multi-way valves and generate pressure, and then the valve cores are pushed to ensure the change of direction of the reversible hydraulic control valves. The second reversible hydraulic control valve 132 and the third reversible hydraulic control valve 133 change direction to change the communication components of the oil passages of the fourth links A and B of the seven-link valve (the second multi-link multi-way valve 122) from the telescopic oil cylinder of the cutting head (the first driving element 141) to the oil cylinder of the sub-beam (the second driving element 142). At this moment, the corresponding telescopic guide handle 171 of the cutting head is pressed, the oil cylinder of the sub-beam starts to perform a supporting operation, and under the action of the equalizing valve 163, the telescopic oil cylinder of the cutting head is held in the current stroke position. Meanwhile, the first reversible hydraulic distribution valve 131 changes direction, so that the load-sensing oil passage of the three-link multi-way valve 121 changes direction and changes the initial return feed to the front pump (the first pump part 1121) of the pump station 112 on the return of the oil tank 111 of the hydraulic system; since the plunger pump used in the hydraulic system 100 according to the present invention is a load-sensing pump, in the absence of feedback on the load-sensing oil passage, the rotation angle of the swash plate of the front pump is the minimum angle, the front pump does not output flow, and thus, when the guide handles 171 of the sprocket and the mono-transport motor are pressed, the sprocket and the mono-transport motor do not move, that is, the locking of the sprocket and the mono-transport motor is ensured during the operation of the sub-beam 210.

[0077] The present disclosure provides a real-time speed control of the sub-beam 210 to meet various operating conditions by further providing a speed control valve group 150 in the oil passage of the rodless cavity (the second rodless cavity 1422) of the oil cylinder of the sub-beam. When oil enters the oil passage of the second rodless cavity 1422, the high-pressure oil fluid is pumped out of the pump station 112, enters the second reversible hydraulic distribution valve 132 and the equalizing valve 163 through the fourth link of the seven-link multi-way valve, and then enters the speed control valve group 150. When the manual reversible valve 151 in the speed control valve group 150 is located in the left position, the oil fluid enters the rodless cavity of the oil cylinder of the sub-beam through the manual reversible valve 151; Since the control method of the guide handle 171 adopted in the present system is proportional control, the movement speed of the sub-beam oil cylinder can be adjusted by adjusting the opening of the guide handle 171, but the pressure and flow rate of the multi-way valve are set in advance, so the speed adjustment range of the sub-beam oil cylinder has certain limitations, which cannot satisfy the requirement of accurate positioning of the sub-beam 210 after it is moved to the working position. The low-speed operation mode can be switched by pulling the manual reversing valve 151 to the right position, at this moment the manual reversing valve 151 in the group 150 of speed control valves is switched to the right position, after throttling by the throttle valve 152, the oil fluid enters the rodless cavity of the oil cylinder of the sub-beam, by means of this method, the oil channel of the oil cylinder (second drive element 142) of the sub-beam can be significantly lowered and, thus, the oil cylinder of the sub-beam can carry out speed adjustment in real time even at a lower pressure and flow rate, and the precise positioning of the sub-beam 210 can be further ensured after it is moved to a position close to the working position.

[0078] In the embodiments specified in the present invention, on the one hand, the reconstruction can be carried out on the basis of the existing hydraulic system 100 to achieve the adjustment of the speed of the sub-beam 210 in real time and the relationship of the support operation and the tunneling operation; on the other hand, the moving speed of the sub-beam 210 can be adjusted in real time under the condition that the flow rate and the pressure of the multi-way valve do not need to be adjusted, and the sub-beam 210 can adjust the moving speed in real time in both the low-speed mode and the high-speed mode; further, when the sub-beam 210 performs the support operation, the star-shaped, mono-transport motor and the telescopic mechanism of the cutting head are locked, the actuators do not move, and personal injury and equipment damage caused by factors such as improper operation are prevented.

[0079] Embodiment 8 of the invention:

[0080] As shown in Fig. 3, an embodiment of the present disclosure provides an engineering machine 200 comprising a hydraulic system 100 and a sub-bar 210 according to any of the above embodiments. The sub-bar 210 is connected to a second drive element 142 of the hydraulic system 100. In the embodiment, the engineering machine 200 further comprises a cutting unit, a sprocket motor, and a mono-transport motor. The cutting unit is connected to the first drive element 141; the sprocket motor is connected to the first multi-link multi-way valve 121; and the mono-transport motor is connected to the first multi-link multi-way valve 121.

[0081] It should be noted that the engineering machine 200 may be equipment such as a tunneling machine.

[0082] According to the embodiments of the hydraulic system and the engineering machine proposed in accordance with the present disclosure, the driving member is driven by a hydraulic system, and compared with the methods of implementing the driving by physical force of a person or a motor, the structure is simple, has high flexibility and is easy to implement precise positioning, and the efficiency and safety performance can be further improved. The first driving member is used for a tunneling operation, the second driving member is used for a supporting operation; a branch oil channel is further provided on the hydraulic oil channel of the first driving member to control the second driving member and provide a function of switching between the tunneling operation and the supporting operation; when the second driving member is in the working state, the first driving member is in a locked state. In addition, by further providing the first reversible hydraulic distribution valve when performing the supporting operation, the sprocket and the mono-transport motor are in a locked state, and this prevents injury to personnel or damage to equipment due to improper operation.

[0083] In the present disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be understood as indicating or implying any relative importance; the term "multiple" refers to two or more unless otherwise indicated. The terms "installation," "connected to," "connection," "fix," and the like are to be understood in a broad sense, for example, the term "connect" may refer to a fixed connection, a detachable connection, or an integral connection; and the term "connected to" may refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art may understand the specific meanings of the aforementioned terms in the present disclosure in accordance with the particular circumstances.

[0084] In describing the present disclosure, it should be understood that the orientation or position relationships referred to by the terms "upper," "lower," "left," "right," "front," "rear," and the like are based on the orientation or position relationships shown in the accompanying drawings, and are intended only to conveniently describe the present disclosure and simplify the description, and do not indicate or imply that the devices or units described must have particular orientations or must be configured or operated in particular orientations, and therefore should not be considered as limiting the present invention.

[0085] In the description of the present disclosure, the terms "an embodiment," "some embodiments," "a particular embodiment," and the like mean that particular features, structures, materials, or characteristics described in conjunction with an embodiment or example are contained in at least one embodiment or example of the present disclosure. In the description, the illustrative expression of the above terms does not necessarily indicate the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described above may be combined in a suitable manner in any or more embodiments or examples.

[0086] The above are only some embodiments of the present disclosure and are not intended to limit the present disclosure, and a person skilled in the art can make various modifications and changes to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure fall within the scope of protection of the present disclosure.

Claims (34)

1. A hydraulic system comprising: hydraulic system oil tank; a pumping station connected to the hydraulic system oil tank; the first multi-link multi-way valve connected to the pumping station; the second multi-link multi-way valve connected to the pumping station; a first reversible hydraulic distribution valve connected to the first multi-link multi-way valve and further connected to the pump station and the oil tank of the hydraulic system, wherein, when the first reversible hydraulic distribution valve is in the first position, the first multi-link multi-way valve communicates with the pump station, and when the first reversible hydraulic distribution valve is in the second position, the first multi-link multi-way valve communicates with the oil tank of the hydraulic system; a second reversible hydraulic distribution valve connected to a second multi-link multi-way valve; a third reversible hydraulic distribution valve connected to the second multi-link multi-way valve; a first drive element connected to the second reversible hydraulic control valve and connected to the third reversible hydraulic control valve, wherein when the second reversible hydraulic control valve is in the first position and the third reversible hydraulic control valve is in the first position, the first drive element is in the operating state; and a second drive element connected to the third reversible hydraulic control valve and connected to the second reversible hydraulic control valve, wherein when the second reversible hydraulic control valve is in the second position and the third reversible hydraulic control valve is in the second position, the second drive element is in the working state. 2. The hydraulic system of claim 1, wherein the first multi-link multi-way valve comprises an oil inlet and a load-sensing oil orifice; the first reversible hydraulic control valve comprises a first interface, a second interface and a third interface; the first interface is connected to the load-sensing oil hole, the second interface is connected to the pump station, and the third interface is connected to the oil tank of the hydraulic system; the first interface is configured to selectively connect to the second interface or the third interface; when the first reversible hydraulic control valve is in the first position, the first interface is connected to the second interface; when the first reversible hydraulic control valve is in the second position, the first interface is connected to the third interface. 3. The hydraulic system according to claim 1, wherein the first drive element is a first oil cylinder, wherein the first oil cylinder comprises a first rod cavity and a first rodless cavity; the second drive element is a second oil cylinder, wherein the second oil cylinder comprises a second rod cavity and a second rodless cavity; the second reversible hydraulic adjustment valve comprises a fourth interface, a fifth interface and a sixth interface; the fourth interface is connected to the second multi-link multi-way valve, the fifth interface is connected to the first rodless cavity, and the sixth interface is connected to the second rodless cavity; the fourth interface is configured to selectively connect to the fifth interface or the sixth interface; when the second reversible hydraulic adjustment valve is in the first position, the fourth interface is connected to the fifth interface; when the second reversible hydraulic adjustment valve is in the second position, the fourth interface is connected to the sixth interface; and the third reversible hydraulic adjustment valve comprises a seventh interface, an eighth interface and a ninth interface; the seventh interface is connected to the second multi-link multi-way valve; the eighth interface is connected to the first rod cavity; and the ninth interface is connected to the second rod cavity; the seventh interface is configured to selectively connect to the eighth interface or the ninth interface; when the third reversible hydraulic adjustment valve is in the first position, the seventh interface is connected to the eighth interface; and when the third reversible hydraulic control valve is in the second position, the seventh interface is connected to the ninth interface. 4. The hydraulic system according to claim 3, wherein the sixth interface is connected to the second rodless cavity through the first fluid passage channel, and the hydraulic system additionally comprises: a group of speed control valves which is located in the first channel for the passage of the fluid. 5. The hydraulic system according to claim 4, wherein the group of speed control valves comprises: a manual reversing valve that includes a tenth interface, an eleventh interface and a twelfth interface, wherein the tenth interface is connected to the sixth interface, the eleventh interface is connected to the sixth interface, the twelfth interface is connected to the second rodless cavity, the twelfth interface is configured to selectively connect to the tenth interface or the eleventh interface; and a throttle valve provided at the eleventh interface, wherein when the twelfth interface is connected to the tenth interface, the working medium sequentially passes through the sixth interface, the tenth interface, the twelfth interface and the second rodless cavity; and when the twelfth interface is connected to the eleventh interface, the working medium sequentially passes through the sixth interface, the throttle valve, the eleventh interface, the twelfth interface and the second rodless cavity. 6. A hydraulic system according to any one of paragraphs 1-5, in which the first multi-link multi-way valve comprises a first oil hole of the control circuit, the second multi-link multi-way valve comprises a second oil hole of the control circuit, and the hydraulic system further comprises: a shuttle valve connected to the first oil hole of the control circuit, wherein the shuttle valve is connected to the second oil hole of the control circuit; a handle assembly connected to the shuttle valve; and a retractable valve connected to the shuttle valve, wherein the retractable valve is connected to the first reversible hydraulic distribution valve, the retractable valve is connected to the second reversible hydraulic distribution valve, and the retractable valve is connected to the third reversible hydraulic distribution valve. 7. The hydraulic system according to any one of claims 1-5, further comprising: a balancing valve connected to the second reversible hydraulic control valve and further connected to the first drive element; and/or the balancing valve is connected to the third reversible hydraulic control valve, and the balancing valve is connected to the second drive element. 8. The hydraulic system of claim 6, wherein the handle assembly comprises a guide handle and a four-position handle that are connected to each other. 9. A hydraulic system according to any one of claims 1 to 5, wherein the pumping station comprises at least two pumping parts that are connected to each other, wherein at least one pumping part is connected to a first multi-link multi-way valve, and the pumping part is connected to a first reversible hydraulic control valve; and at least one pumping part is connected to a second multi-link multi-way valve. 10. An engineering machine comprising: a hydraulic system according to any one of paragraphs 1-9 and a sub-beam connected to a second drive element of the hydraulic system.