CN103994216A - Hydraulic control system for manual steering hydraulic power tractor - Google Patents
Hydraulic control system for manual steering hydraulic power tractor Download PDFInfo
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- CN103994216A CN103994216A CN201410202222.1A CN201410202222A CN103994216A CN 103994216 A CN103994216 A CN 103994216A CN 201410202222 A CN201410202222 A CN 201410202222A CN 103994216 A CN103994216 A CN 103994216A
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- 239000007788 liquid Substances 0.000 claims abstract description 11
- 239000002828 fuel tank Substances 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims 14
- 239000000945 filler Substances 0.000 claims 9
- 238000010521 absorption reaction Methods 0.000 claims 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/26—Generation or transmission of movements for final actuating mechanisms
- F16H61/28—Generation or transmission of movements for final actuating mechanisms with at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted
- F16H61/30—Hydraulic or pneumatic motors or related fluid control means therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
本发明涉及一种手动转向液压动力牵引车液压控制系统，它包括动力泵站、液压表、液压控制阀组、柱塞缸、液压马达，其中动力泵站包括电动机、油箱、液位液温计、空气过滤器、吸油过滤器、液压泵、单向阀、溢流阀、回油过滤器，液压控制阀组包括M型三位四通手动换向阀、溢流阀、液动换向阀、Y型三位四通手动换向阀、二位四通手动换向阀、液控单向阀、节流阀。本发明能够方便实现在不同载荷工况下对工作装置中柱塞缸伸缩的控制和行驶过程中快速与慢速驱动档位的切换，系统结构简洁，操作方便快捷，控制简单，安全可靠，同时消除了操作人员的安全隐患。
The invention relates to a hydraulic control system of a manual steering hydraulic power tractor, which includes a power pump station, a hydraulic gauge, a hydraulic control valve group, a plunger cylinder, and a hydraulic motor, wherein the power pump station includes an electric motor, an oil tank, and a liquid level and temperature gauge , air filter, oil suction filter, hydraulic pump, check valve, relief valve, oil return filter, hydraulic control valve group including M-type three-position four-way manual reversing valve, relief valve, hydraulic reversing valve, Y-type three-position four-way manual directional valve, two-position four-way manual directional valve, hydraulic control check valve, throttle valve. The invention can conveniently realize the telescopic control of the plunger cylinder in the working device under different load conditions and the switching of fast and slow driving gears during driving. The system has simple structure, convenient and quick operation, simple control, safety and reliability, and at the same time Eliminate the potential safety hazard of the operator.
Description
技术领域 technical field
本发明涉及一种液压控制系统，尤其涉及一种手动转向液压动力牵引车液压控制系统。属于液压控制技术领域。 The invention relates to a hydraulic control system, in particular to a hydraulic control system of a manual steering hydraulic power tractor. It belongs to the technical field of hydraulic control.
背景技术 Background technique
目前，半挂车或全挂车的正常行驶均需要牵引汽车的牵引才能够实现。由于牵引汽车体积大，转弯半径大，对场地要求较高，不适合在狭小空间或短距离转运，有时甚至不能实现理想作业要求，而且牵引汽车系统复杂，操作繁琐，需要专业驾驶员，灵活性差，工作效率低。手动转向液压动力牵引车结构紧凑，总长宽高尺寸小，非常适合在厂区内或短距离往返转移空载挂车或短距离运输轻载货物，可大幅提高生产效率，节约时间和成本，但是由于要满足不同载荷和不同车速等工况的要求，目前这类车的大部分功能是通过人力或其他方式实现的，不但操作繁琐，导致工作效率低下，而且工作过程中对操作人员造成一定的安全隐患。 At present, the normal driving of a semi-trailer or a full-trailer all requires the traction of a tractor to realize it. Due to the large volume and large turning radius of the tractor, it has high requirements on the site, and is not suitable for transshipment in a small space or short distance, and sometimes it cannot even achieve the ideal operation requirements. Moreover, the tractor system is complicated, the operation is cumbersome, professional drivers are required, and the flexibility is poor. , low work efficiency. The manual steering hydraulic power tractor has a compact structure and small overall length, width and height. To meet the requirements of different loads and different speeds and other working conditions, most of the functions of this type of vehicle are realized by manpower or other means, which not only is cumbersome to operate, but also leads to low work efficiency, and causes certain safety hazards to operators during the work process .
发明内容 Contents of the invention
本发明的目的在于克服上述不足，提供一种手动转向液压动力牵引车液压控制系统，可以方便地实现不同载荷下执行元件的运动，降低牵引汽车的系统结构，简化操作，提高工作效率和安全性。 The purpose of the present invention is to overcome the above disadvantages and provide a hydraulic control system for a manual steering hydraulic power tractor, which can easily realize the movement of actuators under different loads, reduce the system structure of the tractor, simplify operation, and improve work efficiency and safety .
本发明的目的是这样实现的：一种手动转向液压动力牵引车液压控制系统，它包括动力泵站、液压控制阀组、柱塞缸和液压马达，所述动力泵站的出油口与液压控制阀组的进油口相连接，所述动力泵站的回油口分别与液压控制阀组的回油口和第一液压马达、第二液压马达的回油口相连接，所述液压控制阀组包括第一M型三位四通手动换向阀、第二溢流阀、第三溢流阀、液动换向阀、Y型三位四通手动换向阀、第二M型三位四通手动换向阀、二位四通手动换向阀、液控单向阀和节流阀，所述第一M型三位四通手动换向阀的一个油口与动力泵站的出油口相连，另两个油口分别与Y型三位四通手动换向阀和第二M型三位四通手动换向阀的一个油口相连，所述Y型三位四通手动换向阀的一个油口与液控单向阀的进油口相连，所述液控单向阀的出油口通过节流阀与柱塞缸的进油口相连接，所述Y型三位四通手动换向阀的另一个油口与液控单向阀的控油口相连，所述液动换向阀的进油口与液压控制阀组的进油口相连接，所述液动换向阀的两个出油口分别连接两个对系统压力起限制作用的第二溢流阀和第三溢流阀，所述第二溢流阀和第三溢流阀的出油口分别与所述第一M型三位四通手动换向阀、第二M型三位四通手动换向阀和Y型三位四通手动换向阀的一个油口相连，所述液动换向阀的控油口与液控单向阀的进油口相连接，所述第二M型三位四通手动换向阀的一个油口分别与第一液压马达的进油口和二位四通手动换向阀的一个油口相连接，所述第一液压马达的出油口与二位四通手动换向阀的一个油口相连接，所述二位四通手动换向阀的另一个油口分别与第二M型三位四通手动换向阀的一个油口和第二液压马达的出油口相连接，所述二位四通手动换向阀的一个油口与第二液压马达的出油口相连接。 The object of the present invention is achieved in this way: a hydraulic control system for a manual steering hydraulic power tractor, which includes a power pump station, a hydraulic control valve group, a plunger cylinder and a hydraulic motor, the oil outlet of the power pump station is connected to the hydraulic pressure The oil inlet of the control valve group is connected, and the oil return port of the power pump station is respectively connected with the oil return port of the hydraulic control valve group and the oil return ports of the first hydraulic motor and the second hydraulic motor. The valve group includes the first M-type three-position four-way manual reversing valve, the second relief valve, the third relief valve, hydraulic reversing valve, Y-type three-position four-way manual reversing valve, the second M-type three-position Four-way manual reversing valve, two-position four-way manual reversing valve, hydraulic control check valve and throttle valve, one oil port of the first M-type three-position four-way manual reversing valve is connected to the outlet of the power pump station The other two oil ports are respectively connected with one oil port of the Y-type three-position four-way manual reversing valve and the second M-type three-position four-way manual reversing valve. The Y-type three-position four-way manual reversing valve One oil port of the directional valve is connected with the oil inlet port of the hydraulic control check valve, and the oil outlet port of the hydraulic control check valve is connected with the oil inlet port of the plunger cylinder through the throttle valve, and the Y-type three-position The other oil port of the four-way manual reversing valve is connected with the oil control port of the hydraulic control check valve, the oil inlet of the hydraulic reversing valve is connected with the oil inlet of the hydraulic control valve group, and the hydraulic reversing valve The two oil outlets of the two oil outlets are respectively connected to two second relief valves and third relief valves that limit the system pressure, and the oil outlets of the second relief valve and the third relief valve are respectively connected to the The first M-type three-position four-way manual reversing valve, the second M-type three-position four-way manual reversing valve and one oil port of the Y-type three-position four-way manual reversing valve are connected. The port is connected with the oil inlet port of the hydraulic control check valve, and one oil port of the second M-type three-position four-way manual reversing valve is respectively connected with the oil inlet port of the first hydraulic motor and the two-position four-way manual reversing valve. One oil port of the valve is connected, the oil outlet of the first hydraulic motor is connected with one oil port of the two-position four-way manual reversing valve, and the other oil port of the two-position four-way manual reversing valve is respectively It is connected with an oil port of the second M-type three-position four-way manual reversing valve and the oil outlet of the second hydraulic motor, and one oil port of the two-position four-way manual reversing valve is connected with the outlet of the second hydraulic motor The oil port is connected.
所述动力泵站包括电动机、油箱、液位液温计、空气过滤器、吸油过滤器、液压泵、单向阀和回油过滤器，所述电动机的输出端与液压泵相连，所述液位液温计和空气过滤器均设置于油箱上，所述液压泵的进油口通过吸油过滤器与油箱相连接，所述液压泵的出油口通过单向阀与液压控制阀组的进油口相连接，所述动力泵站的回油口通过回油过滤器与油箱相连接。 The power pump station includes an electric motor, an oil tank, a liquid level thermometer, an air filter, an oil suction filter, a hydraulic pump, a one-way valve and an oil return filter, the output end of the electric motor is connected with the hydraulic pump, and the hydraulic pump Both the liquid level thermometer and the air filter are set on the oil tank, the oil inlet of the hydraulic pump is connected with the oil tank through the oil suction filter, and the oil outlet of the hydraulic pump is connected to the inlet of the hydraulic control valve group through the check valve. The oil ports are connected, and the oil return port of the power pump station is connected with the oil tank through the oil return filter.
所述液压泵的出油口连接有安全保护作用的第一溢流阀。 The oil outlet of the hydraulic pump is connected to the first relief valve with safety protection function.
与现有技术相比，本发明的有益效果是： Compared with prior art, the beneficial effect of the present invention is:
本发明实现了牵引车的操作方便快捷，消除了操作人员的安全隐患；液动换向阀和两个溢流阀的配合使用，实现了工作装置中柱塞缸和驱动工作压力的单独控制，达到了不同载荷工况下柱塞缸伸缩控制的目的；M型三位四通手动换向阀和二位四通手动换向阀的配合使用，实现了两个液压马达的串并联连接，达到了行驶过程中快速与慢速驱动档位切换的目的；由动力泵站、液压控制阀组和执行机构组成的液压控制系统，结构简洁，控制简单，安全可靠。 The invention realizes the convenient and fast operation of the tractor, and eliminates the hidden danger of the operator; the combined use of the hydraulic reversing valve and two overflow valves realizes the independent control of the plunger cylinder and the driving working pressure in the working device, and achieves The telescopic control of the plunger cylinder under different load conditions is achieved; the M-type three-position four-way manual directional valve and the two-position four-way manual directional valve are used together to realize the series-parallel connection of two hydraulic motors, achieving The purpose of switching between fast and slow driving gears during driving; the hydraulic control system composed of a power pump station, a hydraulic control valve group and an actuator has a simple structure, simple control, and is safe and reliable.
附图说明 Description of drawings
图1为本发明一种手动转向液压动力牵引车液压控制系统的示意图。 Fig. 1 is a schematic diagram of a hydraulic control system of a manual steering hydraulic power tractor according to the present invention.
图2为本发明一种手动转向液压动力牵引车液压控制系统的液压控制阀组模块主视图。 Fig. 2 is a front view of a hydraulic control valve block module of a hydraulic control system of a manual steering hydraulic power tractor according to the present invention.
图3为本发明一种手动转向液压动力牵引车液压控制系统的液压控制阀组模块左视图。 Fig. 3 is a left side view of the hydraulic control valve group module of the hydraulic control system of the tractor with manual steering and hydraulic power according to the present invention.
其中： in:
动力泵站1 Power pumping station 1
液压表2 Hydraulic gauge 2
液压控制阀组3 Hydraulic control valve group 3
柱塞缸4 Plunger cylinder 4
第一液压马达51 First hydraulic motor 51
第二液压马达52 Second hydraulic motor 52
电动机6 motor 6
油箱7 fuel tank 7
液位液温计8 Liquid level thermometer 8
空气过滤器9 air filter 9
吸油过滤器10 Oil suction filter 10
液压泵11 hydraulic pump 11
单向阀12 Check valve 12
第一溢流阀13 First relief valve 13
回油过滤器14 Oil return filter 14
第一M型三位四通手动换向阀15 The first M-type three-position four-way manual reversing valve 15
第二溢流阀16 Second relief valve 16
第三溢流阀17 The third relief valve 17
液动换向阀18 Hydraulic reversing valve 18
Y型三位四通手动换向阀19 Y-type three-position four-way manual reversing valve 19
第二M型三位四通手动换向阀20 The second M-type three-position four-way manual reversing valve 20
二位四通手动换向阀21 Two-position four-way manual reversing valve 21
液控单向阀22 Hydraulic control check valve 22
节流阀23。 Throttle valve 23.
具体实施方式 Detailed ways
参见图1—图3，本发明涉及一种手动转向液压动力牵引车液压控制系统，该系统包括动力泵站1、液压表2、液压控制阀组3、柱塞缸4、第一液压马达51和第二液压马达52，所述动力泵站1包括电动机6、油箱7、液位液温计8、空气过滤器9、吸油过滤器10、液压泵11、单向阀12、第一溢流阀13和回油过滤器14，所述电动机6的输出端与液压泵11相连，所述液位液温计8和空气过滤器9均设置于油箱7上，所述液压泵11的进油口通过吸油过滤器10与油箱7相连接，所述液压泵11的出油口通过单向阀12与液压控制阀组3的进油口P相连接，所述液压表2设置于动力泵站1的液压泵11出油口，用于显示系统压力，所述液压泵11的出油口连接有安全保护作用的第一溢流阀13，所述动力泵站1的回油口T1、T2分别与液压控制阀组3的回油口T和第一液压马达51、第二液压马达52的回油口L相连接，所述动力泵站1的回油口通过回油过滤器14与油箱7相连接。 Referring to Fig. 1-Fig. 3, the present invention relates to a hydraulic control system of a manual steering hydraulic power tractor, the system includes a power pump station 1, a hydraulic gauge 2, a hydraulic control valve group 3, a plunger cylinder 4, and a first hydraulic motor 51 and a second hydraulic motor 52, the power pump station 1 includes an electric motor 6, an oil tank 7, a liquid level thermometer 8, an air filter 9, an oil suction filter 10, a hydraulic pump 11, a one-way valve 12, a first overflow Valve 13 and oil return filter 14, the output end of the motor 6 is connected with the hydraulic pump 11, the liquid level liquid temperature gauge 8 and the air filter 9 are all arranged on the oil tank 7, the oil inlet of the hydraulic pump 11 The port is connected to the oil tank 7 through the oil suction filter 10, the oil outlet of the hydraulic pump 11 is connected to the oil inlet P of the hydraulic control valve group 3 through the check valve 12, and the hydraulic gauge 2 is set at the power pump station The oil outlet of the hydraulic pump 11 of 1 is used to display the system pressure. The oil outlet of the hydraulic pump 11 is connected to the first overflow valve 13 with a safety protection function. The oil return ports T1 and T2 of the power pump station 1 They are respectively connected to the oil return port T of the hydraulic control valve group 3 and the oil return port L of the first hydraulic motor 51 and the second hydraulic motor 52, and the oil return port of the power pump station 1 is connected to the oil tank through the oil return filter 14 7 phase connections.
所述液压控制阀组3包括第一M型三位四通手动换向阀15、第二溢流阀16、第三溢流阀17、液动换向阀18、Y型三位四通手动换向阀19、第二M型三位四通手动换向阀20、二位四通手动换向阀21、液控单向阀22和节流阀23，所述第一M型三位四通手动换向阀15的进油口与动力泵站1的出油口相连，所述Y型三位四通手动换向阀19通过液控单向阀22和节流阀23与柱塞缸4的进油口A1相连接，所述第二M型三位四通手动换向阀20和二位四通手动换向阀21分别与第一液压马达51、第二液压马达52的进油口A2、A3和出油口B2、B3相连接，所述液动换向阀18的进油口与液压控制阀组3的进油口P相连接，所述液动换向阀18的两个出油口A、B分别连接两个对系统压力起限制作用的第二溢流阀16和第三溢流阀17，所述液动换向阀18的控制油口与液控单向阀22的进油口相连接。 The hydraulic control valve group 3 includes a first M-type three-position four-way manual reversing valve 15, a second relief valve 16, a third relief valve 17, a hydraulic reversing valve 18, a Y-type three-position four-way manual reversing valve Directional valve 19, second M-type three-position four-way manual reversing valve 20, two-position four-way manual reversing valve 21, hydraulic control check valve 22 and throttle valve 23, the first M-type three-position four-way The oil inlet of the manual reversing valve 15 is connected with the oil outlet of the power pump station 1, and the Y-type three-position four-way manual reversing valve 19 is connected with the plunger cylinder 4 through the hydraulic control check valve 22 and the throttle valve 23. The oil inlet A1 is connected, and the second M-type three-position four-way manual reversing valve 20 and the two-position four-way manual reversing valve 21 are connected with the oil inlets of the first hydraulic motor 51 and the second hydraulic motor 52 respectively. A2, A3 are connected with oil outlets B2, B3, the oil inlet of the hydraulic control valve 18 is connected with the oil inlet P of the hydraulic control valve group 3, and the two oil outlets of the hydraulic control valve 18 Ports A and B are respectively connected to two second relief valves 16 and third relief valves 17 that limit the system pressure. connected to the mouth.
所述动力泵站1的出油口与液压控制阀组3的进油口P相连接，液压控制阀组3的进油口P分别与第一M型三位四通手动换向阀15的油口P和液动换向阀18的油口P相连接，第一M型三位四通手动换向阀15的油口A与Y型三位四通手动换向阀19的油口P相连接，Y型三位四通手动换向阀19的油口A分别与液控单向阀22的进油口和液动换向阀18的控制油口相连接，Y型三位四通手动换向阀19的油口B与液控单向阀22的控制油口相连接，液控单向阀22的出油口与节流阀23的进油口相连接，节流阀23的出油口与柱塞缸4的油口A1相连接，液动换向阀18的油口A和油口B分别与溢流阀16和溢流阀17的进油口相连接，溢流阀16和溢流阀17的出油口经过Y型三位四通手动换向阀19的油口T、M型三位四通手动换向阀20的油口T和M型三位四通手动换向阀15的油口T与液压控制阀组3的出油口T相连接，M型三位四通手动换向阀15的油口B与M型三位四通手动换向阀20的油口P相连接，M型三位四通手动换向阀20的油口A分别与第一液压马达51的进油口A2和二位四通手动换向阀21的油口P相连接，第一液压马达51的出油口B2与二位四通手动换向阀21的油口T相连接，二位四通手动换向阀21的油口B分别与M型三位四通手动换向阀20的油口B和第二液压马达52的出油口B3相连接，二位四通手动换向阀21的油口A与第二液压马达52的出油口A3相连接。 The oil outlet of the power pump station 1 is connected to the oil inlet P of the hydraulic control valve group 3, and the oil inlet P of the hydraulic control valve group 3 is respectively connected to the first M-type three-position four-way manual reversing valve 15. The oil port P is connected with the oil port P of the hydraulic reversing valve 18, and the oil port A of the first M-type three-position four-way manual reversing valve 15 is connected with the oil port P of the Y-type three-position four-way manual reversing valve 19. Connection, the oil port A of the Y-type three-position four-way manual reversing valve 19 is respectively connected with the oil inlet port of the hydraulic control check valve 22 and the control oil port of the hydraulic reversing valve 18, and the Y-type three-position four-way manual reversing valve The oil port B of the directional valve 19 is connected with the control oil port of the hydraulic control check valve 22, the oil outlet of the hydraulic control check valve 22 is connected with the oil inlet of the throttle valve 23, and the oil outlet of the throttle valve 23 port is connected with oil port A1 of plunger cylinder 4, oil port A and oil port B of hydraulic reversing valve 18 are respectively connected with the oil inlet ports of relief valve 16 and relief valve 17, relief valve 16 and relief valve The oil outlet of the flow valve 17 passes through the oil port T of the Y-type three-position four-way manual reversing valve 19, the oil port T of the M-type three-position four-way manual reversing valve 20 and the M-type three-position four-way manual reversing valve The oil port T of 15 is connected with the oil outlet T of the hydraulic control valve group 3, the oil port B of the M-type three-position four-way manual reversing valve 15 is connected with the oil port P of the M-type three-position four-way manual reversing valve 20 The oil port A of the M-type three-position four-way manual reversing valve 20 is connected with the oil inlet A2 of the first hydraulic motor 51 and the oil port P of the two-position four-way manual reversing valve 21 respectively. The oil outlet B2 of the motor 51 is connected to the oil port T of the two-position four-way manual reversing valve 21, and the oil port B of the two-position four-way manual reversing valve 21 is respectively connected to the M-type three-position four-way manual reversing valve 20 The oil port B of the second hydraulic motor 52 is connected to the oil outlet B3 of the second hydraulic motor 52, and the oil port A of the two-position four-way manual reversing valve 21 is connected to the oil outlet A3 of the second hydraulic motor 52.
所述第一M型三位四通手动换向阀15处于中位时，柱塞缸4和第一液压马达51、第二液压马达52均没有动作；当第一M型三位四通手动换向阀15切换到左位，Y型三位四通手动换向阀19切换到左位时，油液通过液控单向阀22和节流阀23进入柱塞缸4，实现柱塞缸4的伸出动作，油液同时进入液动换向阀18的控制油口，液动换向阀18切换到右位，系统压力由第二溢流阀16设定压力所决定；当第一M型三位四通手动换向阀15切换到左位，Y型三位四通手动换向阀19切换到右位时，油液进入液控单向阀22的控制油口，液控单向阀22打开，柱塞缸4中的油液通过节流阀23和液控单向阀22回到油箱7，实现柱塞缸4的收缩动作；当第一M型三位四通手动换向阀15切换到右位，通过切换第二M型三位四通手动换向阀20和二位四通手动换向阀21，实现快速与慢速驱动档位的切换，液动换向阀18处于初始位置，系统压力由溢流阀17设定压力所决定。 When the first M-type three-position four-way manual reversing valve 15 is in the neutral position, the plunger cylinder 4, the first hydraulic motor 51, and the second hydraulic motor 52 do not move; when the first M-type three-position four-way manual When the reversing valve 15 is switched to the left position, and when the Y-type three-position four-way manual reversing valve 19 is switched to the left position, the oil enters the plunger cylinder 4 through the hydraulic control check valve 22 and the throttle valve 23, realizing the plunger cylinder 4, the oil enters the control oil port of the hydraulic reversing valve 18 at the same time, the hydraulic reversing valve 18 is switched to the right position, and the system pressure is determined by the set pressure of the second relief valve 16; when the first M type When the three-position four-way manual reversing valve 15 is switched to the left position, and when the Y-type three-position four-way manual reversing valve 19 is switched to the right position, the oil enters the control oil port of the hydraulic control check valve 22, and the hydraulic control check valve 22 is opened, the oil in the plunger cylinder 4 returns to the oil tank 7 through the throttle valve 23 and the hydraulic control check valve 22, and the contraction action of the plunger cylinder 4 is realized; when the first M-type three-position four-way manual reversing valve 15 is switched to the right position. By switching the second M-type three-position four-way manual directional valve 20 and two-position four-way manual directional valve 21, the switch between fast and slow driving gears is realized. The hydraulic directional valve 18 is in the initial state. position, the system pressure is determined by the set pressure of the overflow valve 17.
所述节流阀23通过调节开口大小，可以实现对柱塞缸4伸缩速度快慢的控制。 The throttling valve 23 can realize the control of the telescoping speed of the plunger cylinder 4 by adjusting the size of the opening.
所述第二M型三位四通手动换向阀20切换到左位，二位四通手动换向阀21处于左位时，两个液压马达串联，驱动档位为快速档；当第二M型三位四通手动换向阀20切换到左位，二位四通手动换向阀21切换到右位时，两个液压马达并联，驱动档位为慢速档。 The second M-type three-position four-way manual reversing valve 20 is switched to the left position, and when the two-position four-way manual reversing valve 21 is in the left position, two hydraulic motors are connected in series, and the driving gear is a fast gear; when the second When the M-type three-position four-way manual reversing valve 20 is switched to the left position, and when the two-position four-way manual reversing valve 21 is switched to the right position, the two hydraulic motors are connected in parallel, and the driving gear is the slow gear.
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