CN107906059B - A high-pressure pump voltage stabilization system and method - Google Patents
A high-pressure pump voltage stabilization system and method Download PDFInfo
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- CN107906059B CN107906059B CN201711076454.7A CN201711076454A CN107906059B CN 107906059 B CN107906059 B CN 107906059B CN 201711076454 A CN201711076454 A CN 201711076454A CN 107906059 B CN107906059 B CN 107906059B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000006641 stabilisation Effects 0.000 title claims abstract description 9
- 238000011105 stabilization Methods 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 62
- 230000000087 stabilizing effect Effects 0.000 claims description 20
- 230000009471 action Effects 0.000 claims description 13
- 238000012360 testing method Methods 0.000 abstract description 14
- 230000001276 controlling effect Effects 0.000 description 22
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000010349 pulsation Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/50—Pressure control
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- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
一种高压液压泵测试的稳压系统和方法，所述稳压系统包括被试液压泵，高压蓄能器，低压蓄能器，蓄能器切换装置，压力传感器，控制部，所述高压蓄能器与液压泵出口油路接通，所述低压蓄能器通过蓄能器切换装置与液压泵出口油路接通，所述被试液压泵开启后，压力传感器监测油路压力，当压力小于预设值，油液通过蓄能器切换装置进入低压蓄能器，由低压蓄能器维持系统压力稳定，当压力大于预设值，控制部控制所述蓄能器切换装置进行切换，油路与所述低压蓄能器通道截止，由高压蓄能器维持系统压力稳定。
A voltage stabilization system and method for testing a high-pressure hydraulic pump, the voltage stabilization system includes a tested hydraulic pump, a high-pressure accumulator, a low-pressure accumulator, an accumulator switching device, a pressure sensor, a control unit, and the high-pressure accumulator. The accumulator is connected to the hydraulic pump outlet oil circuit, and the low-pressure accumulator is connected to the hydraulic pump outlet oil circuit through the accumulator switching device. After the tested hydraulic pump is turned on, the pressure sensor monitors the oil circuit pressure. When the pressure is less than the preset value, the oil enters the low-pressure accumulator through the accumulator switching device, and the low-pressure accumulator maintains the system pressure stable. When the pressure is greater than the preset value, the control part controls the accumulator switching device to switch, and the oil The road is cut off from the channel of the low-pressure accumulator, and the high-pressure accumulator keeps the system pressure stable.
Description
Technical Field
The invention relates to a pressure stabilizing system of a hydraulic pump, in particular to a pressure stabilizing system for testing a high-pressure hydraulic pump and a using method thereof.
Background
At present, a plunger type structure is generally adopted in a high-pressure hydraulic pump, so that pressure and flow pulsation often occur in a hydraulic system, the pulsation can be reduced by connecting an energy accumulator at the outlet of the hydraulic pump, but in a performance test of the high-pressure hydraulic pump, due to the fact that the nominal pressure of the high-pressure pump is very high, and an overload test is carried out in a delivery test of the hydraulic pump, the pressure regulating range of the whole oil system is very large, and even reaches 0-50 Mpa. The existing pump test hydraulic system generally adopts a single energy accumulator, and in a high-pressure test system, if the inflation pressure of the energy accumulator is low, although the pressure stabilizing requirement of the system in a low-pressure state can be met, in a high-pressure state, the energy accumulator exceeds a load range, so that the energy accumulator is greatly damaged, and even certain danger exists. On the contrary, if the pressure of the accumulator is high, although the pressure stabilizing requirement of the system in a high-pressure state can be met, when the system is in a low-pressure state, the accumulator cannot well absorb the pressure and flow pulsation of the high-pressure pump, and certain impact can be caused on the whole hydraulic system.
Disclosure of Invention
The invention provides a pressure stabilizing system of a high-pressure hydraulic pump, which comprises a tested hydraulic pump, a high-pressure accumulator, a low-pressure accumulator, an accumulator switching device, a pressure sensor and a control part, wherein the pressure sensor is connected with the pressure sensor; the high-pressure accumulator is communicated with an oil path at the outlet of the hydraulic pump, the low-pressure accumulator is communicated with the oil path at the outlet of the hydraulic pump through an accumulator switching device, after the tested hydraulic pump is started, a pressure sensor monitors the pressure of the oil path, when the pressure is smaller than a preset value, oil enters the low-pressure accumulator through the accumulator switching device, the pressure of the system is maintained to be stable by the low-pressure accumulator, when the pressure is larger than the preset value, the control part controls the accumulator switching device to switch, the oil path is cut off from a channel of the low-pressure accumulator, and the pressure of the system is maintained to be.
When the energy accumulator switching device closes the oil passage and the low-pressure energy accumulator passage, the passage between the low-pressure energy accumulator and the liquid tank is opened, and the residual oil in the low-pressure energy accumulator returns to the liquid tank through the passage.
Preferably, the accumulator switching device adopts a pilot type electromagnetic reversing valve.
Preferably, the high-pressure energy accumulator and the low-pressure energy accumulator are precharged with different pressure values, for example, the precharge pressure value of the high-pressure energy accumulator is 30-40MPa, the precharge pressure value of the low-pressure energy accumulator is 15-25MPa in a hydraulic system with the pressure regulating range of 0-50MPa,
the invention also provides a pressure stabilizing method of the hydraulic pump, which is characterized in that: the oil circuit is connected with a high-pressure energy accumulator, a low-pressure energy accumulator, an electromagnetic directional valve and a pressure sensor, the high-pressure energy accumulator is communicated with the oil circuit at the outlet of the hydraulic pump, and the low-pressure energy accumulator is communicated with the oil circuit at the outlet of the hydraulic pump through the electromagnetic directional valve. The control method comprises the following steps:
opening an oil way and presetting a pressure value;
b, a control signal is not sent to an electromagnetic pilot valve for controlling the valve core of the electromagnetic directional valve to act, the valve core of the electromagnetic directional valve does not act, and a channel between oil and the low-pressure accumulator is opened;
c, monitoring the current pressure of the oil circuit system by a pressure sensor, and when the system pressure is lower than the set pressure, proceeding to the step D, and when the system pressure is higher than the set pressure, proceeding to the step E;
d, when the pressure of the system is lower than the set pressure, stopping sending a control signal to an electromagnetic pilot valve for controlling the valve core of the electromagnetic directional valve to act, opening a channel between the system and the low-pressure energy accumulator, allowing oil to enter the low-pressure energy accumulator through the electromagnetic directional valve, and maintaining the pressure of the system to be stable by the low-pressure energy accumulator;
when the pressure of the system is greater than a preset value, a control signal is sent to an electromagnetic directional valve for controlling the valve core of the electromagnetic directional valve to act, the valve core of the electromagnetic directional valve is reversed, a channel between the system and a low-pressure energy accumulator is closed, a channel between the low-pressure energy accumulator and a liquid tank is opened, residual oil in the low-pressure energy accumulator returns to the liquid tank through the channel, and the pressure of the system is maintained to be stable by a high-pressure energy accumulator;
F. c, judging, if the detected high-pressure pump does not stop working, repeating the steps C to E, and if the high-pressure pump stops working, performing the step G;
g, stopping sending a control signal to the control electromagnetic directional valve, resetting the valve core of the electromagnetic directional valve, opening a channel between the low-pressure energy accumulator and the outlet of the hydraulic pump, conducting the low-pressure energy accumulator and the outlet of the hydraulic pump, and stopping a channel between the low-pressure energy accumulator and the liquid tank.
Preferably, the electromagnetic directional valve is a pilot type electromagnetic directional valve.
Preferably, in the step F, the upper computer performs the delay determination.
In another embodiment, the accumulator switching device is a solenoid directional valve with a double-valve-core structure, preferably a pilot-operated solenoid directional valve with a double-valve-core structure. The pilot-operated electromagnetic valve comprises a first valve core and a second valve core, wherein an inlet of the first valve core is communicated with an oil path of an outlet of the hydraulic pump, an outlet of the first valve core is communicated with an inlet of the second valve core and the low-pressure accumulator, an inlet of the second valve core is communicated with an outlet of the first valve core and the low-pressure accumulator, a channel connected with a liquid tank is reserved on the second valve core, and the channel is cut off in an initial state. The first valve core controls the on-off state, and the second valve core can discharge residual liquid in the energy accumulator. When the pressure is larger than the preset value, the control part controls the first valve core to change direction so that the oil way is cut off from the low-pressure accumulator channel, meanwhile, the second valve core changes direction so that the channel between the low-pressure accumulator and the liquid tank is opened, and residual oil in the low-pressure accumulator returns to the liquid tank through the second valve core.
Preferably, the two valve core strings adopt an integrated structure and are connected with the valve body through screw sleeves.
Preferably, the control valve core of the first valve core is provided with an air hole, so that a closed air cavity is formed between the inner cavity of the control valve core and the liquid passing sleeve in the process of preventing the thrust valve core from acting and the reliable stop cannot be realized.
In another embodiment, an electromagnetic directional valve with a double-valve-core structure is adopted as an energy accumulator switching device, wherein a high-pressure energy accumulator and a low-pressure energy accumulator are connected in an oil path, the electromagnetic directional valve comprises a first valve core and a second valve core, and a pressure sensor, the high-pressure energy accumulator is communicated with an oil path at an outlet of a hydraulic pump, the low-pressure energy accumulator is communicated with the oil path at the outlet of the hydraulic pump through the electromagnetic directional valve, and the pressure stabilization control method comprises the following steps:
opening the oil circuit A, presetting a pressure value,
b, sending no control signal to the electromagnetic pilot valves for controlling the first valve core and the second valve core to act, wherein the first valve core and the second valve core do not act, the oil liquid at the outlet of the hydraulic pump and the low-pressure accumulator channel are opened, and the passage between the low-pressure accumulator and the liquid tank is cut off;
c, monitoring the current pressure of the oil circuit system by a pressure sensor, and going to step D when the system pressure is lower than the set pressure, and going to step E when the system pressure is higher than the set pressure
D, when the system pressure is lower than the set pressure, stopping sending a control signal to an electromagnetic pilot valve for controlling the first valve core and the second valve core to act, enabling the first valve core and the second valve core of the electromagnetic directional valve to not act, opening a passage between oil liquid at an outlet of the hydraulic pump and a low-pressure energy accumulator, stopping a passage between the low-pressure energy accumulator and a liquid tank, enabling the oil liquid to respectively pass through a liquid hole of the first valve core and a liquid passage between the first valve core and the second valve core, enabling an annular cavity outside the second valve core to enter the low-pressure energy accumulator, and enabling the system to be kept stable in pressure by the low-;
when the pressure of the system is larger than a preset value, a control system sends a control signal to an electromagnetic pilot valve for controlling the action of a first valve core, the first valve core acts, an outlet oil way of a hydraulic pump is cut off from a passage of a low-pressure energy accumulator, oil stops entering the low-pressure energy accumulator, the system maintains stable pressure by the high-pressure energy accumulator, meanwhile, the electromagnetic pilot valve for controlling the action of a second valve core sends a control signal, the second valve core acts, a passage between the low-pressure energy accumulator and a liquid tank is opened, and residual oil in the low-pressure energy accumulator returns to the liquid tank;
F. c, judging, if the detected high-pressure pump does not stop working, repeating the steps C to E, and if the high-pressure pump stops working, performing the step G;
g, stopping sending control signals to the electromagnetic directional valve for controlling the first valve core to move and the second valve core to move, resetting the first valve core and the second valve core, opening a channel between the low-pressure energy accumulator and the outlet of the hydraulic pump, conducting the low-pressure energy accumulator and the outlet of the hydraulic pump, and stopping a channel between the low-pressure energy accumulator and the liquid tank.
Preferably, the electromagnetic directional valve is a pilot type electromagnetic directional valve.
Preferably, in the step F, the upper computer performs the delay determination.
According to the system pressure stabilizing scheme for switching the high-pressure accumulator and the low-pressure accumulator, the problem that a single accumulator cannot well meet the test requirement of a high-pressure pump test hydraulic system is solved by arranging the two accumulators with different pressure ranges, and automatic stopping and liquid leakage of the low-pressure accumulator in the high-pressure state of the system are realized, so that the pressure stability of the hydraulic system in different pressure states is maintained.
The invention adopts the realization scheme of double valve cores, so that the structure is more compact; meanwhile, if one of the electromagnetic pilot valves fails, the system pressure stability is not greatly affected, and the system stability is higher. The electromagnetic pilot valve can realize automatic switching of the valve; the control valve core is provided with an air hole to ensure the reliable sealing of the valve core and the valve seat; the valve core string adopts an integral plug-in type structure, and is convenient to disassemble and assemble.
The whole pressure stabilizing system is simple and reliable to build, the automatic control of the whole hydraulic pressure stabilization can be realized by combining with upper computer software, and the operation is convenient and fast.
Drawings
FIG. 1 is a system schematic of a first embodiment of a surge system for testing a hydraulic pump according to the present disclosure;
FIG. 2 is a flow chart of a method of a first embodiment of a pressure stabilizing system for testing a hydraulic pump according to the present disclosure;
FIG. 3 is a system schematic of a second embodiment of a pressure stabilizing system for hydraulic pump testing of the present disclosure;
reference numerals:
1-tested high pressure pump; 2-driving the motor; 3-a filter; 4-a low pressure accumulator; 5-a pilot-operated electromagnetic directional valve; 6-a pressure sensor; 7-a high pressure accumulator; 8-pressure regulating valve; 9-a cooler; 10-safety valve; 11-liquid tank.
12 pilot type double-spool electromagnetic directional valve; 12-1 a first valve core; 12-2 second valve core, 12-3 electromagnetic pilot valve for controlling first valve core action; 12-4, an electromagnetic pilot valve for controlling the action of the second valve core;
Detailed Description
The technical solutions in the embodiments of the present disclosure will be described below in a clear and complete manner with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Example 1
Fig. 1 is a schematic diagram of a pressure stabilizing system for testing a hydraulic pump according to the present invention, which mainly comprises: 1-tested high pressure pump; 2-driving the motor; 3-a filter; 4-a low pressure accumulator; 5-a pilot-operated electromagnetic directional valve; 6-a pressure sensor; 7-a high pressure accumulator; 8-pressure regulating valve; 9-a cooler; 10-safety valve; 11-liquid tank.
The driving motor 2 drives the tested high-pressure pump 1 to absorb liquid from the liquid tank 11, and the oil returns to the liquid tank again after passing through the pressure regulating valve 8 and the cooler 9 of the filter 3; the outlet of the tested high-pressure pump 1 is connected with a high-pressure energy accumulator 7 and a low-pressure energy accumulator 4 in parallel, wherein the front part of the low-pressure energy accumulator 4 is connected with a pilot-operated electromagnetic reversing valve 5 in series; meanwhile, the outlet of the tested high-pressure pump 1 is connected with a pressure sensor 6 and a safety valve 10.
The filter filters oil, the pressure sensor feeds back the system pressure, the automatic control of the system is realized by matching with upper computer software, the cooler cools the oil, and the safety valve plays a role in overload protection of the system.
The hydraulic pump test system is realized by adopting the following method, and the control flow is shown in figure 2 by combining with upper computer software:
the tested high-pressure pump 1 is started, the system is in a no-load starting state, a preset pressure value is set in software of the upper computer, the upper computer does not send a control signal to an electromagnetic pilot valve of the electromagnetic directional valve 5 at the moment, oil enters the low-pressure energy accumulator 4 through the electromagnetic directional valve 5, the high-pressure energy accumulator 7 is always connected, but the pressure of the system is high, so that the air bag of the system cannot generate large deformation, and the pressure of the system is low at the moment, so that the low-pressure energy accumulator 4 with low inflation pressure realizes a pressure stabilizing effect. Then, the system is judged in a software circulation mode, when the system pressure is lower than the set pressure, the electromagnetic pilot valve of the pilot type electromagnetic directional valve 5 does not send a control signal, and the system still realizes the pressure stabilizing effect by the low-pressure energy accumulator 4 with low inflation pressure; when the system pressure is larger than the set pressure value, the upper computer sends a control signal to the electromagnetic pilot valve of the pilot electromagnetic directional valve 5, the valve core of the pilot electromagnetic directional valve is reversed, the channel from the system to the low-pressure energy accumulator 4 is cut off, meanwhile, the channel between the low-pressure energy accumulator 4 and the liquid tank is opened, the oil remained in the low-pressure energy accumulator 4 returns to the liquid tank through the channel, at the moment, the pump outlet is cut off from the low-pressure energy accumulator 4, and the system is kept stable in pressure by the high-pressure energy accumulator 7. And (3) slightly delaying in the software of the upper computer, continuously judging, if the detected high-pressure pump 1 stops working, stopping sending a control signal to the electromagnetic pilot valve of the electromagnetic directional valve 5 by the upper computer, and if the detected high-pressure pump 1 does not stop working, returning to continuously and circularly judge the relation between the system pressure value and the preset pressure value.
Example 2
Referring to fig. 3, the other connection relationship of the fluid path system is the same as that of embodiment 1, in this embodiment, the electromagnetic directional valve uses a pilot type double-spool electromagnetic directional valve 12, wherein an inlet of a first spool 12-1 is connected with an outlet of the tested high-pressure pump 1, an outlet is communicated with a low-pressure accumulator 4 and an inlet of a second spool 12-2, and an outlet of the second spool 12-2 is communicated with a fluid tank 11. The first valve core is responsible for switching on and switching off, and the second valve core enables the liquid in the low-pressure accumulator to return to the liquid tank.
The pressure stabilizing scheme of the hydraulic pump testing system is realized by adopting the following pressure stabilizing scheme, firstly, a tested high-pressure pump 1 is started, the system is in a no-load starting state, a preset pressure value is set in upper computer software, at the moment, an electromagnetic pilot valve 12-3 for controlling the first valve core to act and an electromagnetic pilot valve 12-4 for controlling the second valve core to act are not sent with control signals, the first valve core 12-1 and the second valve core 12-2 do not act, oil enters a low-pressure energy accumulator 4 through the first valve core 12-1, although a high-pressure energy accumulator 7 is always connected, the system pressure does not enable an air bag of the high-pressure energy accumulator to generate large deformation due to high inflation pressure, and at the moment, the system has the pressure stabilizing effect of the system by the low-pressure energy accumulator 4 with low inflation pressure. Then, the system is judged in a software circulation mode, when the system pressure is lower than a set pressure value, the upper computer still does not send control signals to the electromagnetic pilot valve 12-3 for controlling the first valve core to act and the electromagnetic pilot valve 12-4 for controlling the second valve core to act of the pilot type double-valve-core electromagnetic directional valve 12, and the system still realizes the pressure stabilization effect by the low-pressure energy accumulator 4 with low inflation pressure; when the system pressure reaches or exceeds a preset pressure value, control signals are sent to an electromagnetic pilot valve 12-3 for controlling the first valve core to act and an electromagnetic pilot valve 12-4 for controlling the second valve core to act through the upper computer software, the first valve core 12-1 is reversed, the channel from the system to the low-pressure energy accumulator 4 is cut off, meanwhile, the second valve core 12-2 is reversed, oil liquid remaining in the low-pressure energy accumulator 4 returns to a liquid tank through the second valve core 12-2, at the moment, the low-pressure energy accumulator 4 is cut off, and the system is maintained to be stable in pressure through the high-pressure energy accumulator 7. And (3) slightly delaying in the software of the upper computer, continuously judging, if the detected high-pressure pump 1 stops working, stopping sending a control signal to the electromagnetic pilot valve of the electromagnetic directional valve 5 by the upper computer, and if the detected high-pressure pump 1 does not stop working, returning to continuously and circularly judge the relation between the system pressure value and the preset pressure value.
The first valve core string and the second valve core string are of an integrated structure, are connected through screws and are connected with the valve body through screw sleeves, and therefore the valve is convenient to disassemble and assemble. The two electromagnetic pilot valves are designed in one valve block to form the electromagnetic pilot valve.
When the system works, the port P is communicated with the outlet of a tested high-pressure pump, when the system is in a low-pressure state, oil enters the low-pressure energy accumulator through the port P, the first valve core valve rod liquid passing hole, the first valve core screw sleeve liquid passing hole and the channel A, and the system maintains pressure stability through the low-pressure energy accumulator. When the system pressure is higher than the set pressure, the upper computer software is combined, at the moment, control signals are sent to two electromagnets of the electromagnetic pilot valve 28 at the same time, the oil liquid at the port P enters the electromagnetic pilot valve through the filter, and enters the control ports K1 and K2 after being reversed by the electromagnetic pilot valve, wherein the oil liquid at the port K1 enters the control chamber, and the oil liquid acts on the annular end surface of the control chamber at the lower end of the first valve core control valve core, the acting force of the oil liquid is larger than the acting force acting on the annular end surface at the upper end of the first valve core control valve core, so that the first valve core control valve core is pushed to move upwards and is pressed on the first valve seat, the first valve core control valve core is provided with an air hole, so that a closed air cavity is formed between the inner cavity of the control valve core and the valve rod of the first valve core in the process of pushing the first valve core, the P port and the low-pressure accumulator can not be reliably stopped. At the moment, the port P and the first valve core thread sleeve are stopped by the liquid passing hole, and oil cannot enter the low-pressure accumulator; meanwhile, control liquid of the K2 port acts on the control end of the second valve core valve rod, the second valve core valve rod overcomes the spring force of the spring, so that the liquid passing hole of the second valve sleeve is communicated with the liquid passing hole of the second valve core valve rod, residual oil in the low-pressure accumulator is communicated with the liquid passing hole of the second valve core valve rod through the A port and the liquid passing hole of the second valve sleeve, and returns to the liquid tank through the T port, and the pressure of the system is maintained to be stable by the high-pressure accumulator. When the system pressure is lower than the set pressure, the control signal is stopped being sent to the electromagnetic pilot valve, no control liquid exists at K1 and K2 ports, the first valve core control valve core resets under the action of the pressure of the P port, a channel between the P port and the low-pressure accumulator is opened, meanwhile, the valve rod of the second valve core is pressed on the valve seat of the second valve core under the action of the spring force, the low-pressure accumulator and the channel of the T port are stopped, and the system is maintained to be stable in pressure by the low-pressure accumulator again.
The advantage of adopting the double-valve core structure in the second embodiment lies in: if the electromagnetic pilot valve controlling the first valve core to act fails, when the system pressure is greater than the set pressure, the control part simultaneously sends a control signal to the electromagnetic pilot valve controlling the first valve core and the second valve core to act, at the moment, the first valve core does not act due to the failure of the electromagnetic pilot valve controlling the first valve core to act, the second valve core is reversed, so that the low-pressure energy accumulator and a liquid tank channel are opened, at the moment, high-pressure oil from the hydraulic pump returns to the liquid tank through the channel, and the low-pressure energy accumulator is protected; if the electromagnetic pilot valve controlling the second valve core to act is in fault, when the system pressure is greater than the set pressure, the control part simultaneously sends control signals to the electromagnetic pilot valve controlling the first valve core and the second valve core to act, the first valve core is reversed to cut off the oil circuit at the outlet of the hydraulic pump and the channel of the low-pressure accumulator, the system plays a role in stabilizing the pressure by the high-pressure accumulator, and at the moment, the second valve core controls the electromagnetic pilot valve controlling the second valve core to act in fault, but not working, the direct channel between the low-pressure energy accumulator and the liquid tank can not be opened, so that a part of oil liquid can be remained in the low-pressure energy accumulator, when the pressure of the system is lower than a set value or the system stops working, the control part stops sending a control signal to the electromagnetic pilot valve which controls the first valve core and the second valve core to act, the first valve core resets, the low-pressure energy accumulator is communicated with a channel of an oil way at the outlet of the hydraulic pump, and oil remained in the low-pressure energy accumulator is discharged back to the oil tank through the system;
the above embodiments are only suitable for illustrating the present disclosure, and not limiting the present disclosure, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present disclosure, so that all equivalent technical solutions also belong to the scope of the present disclosure, and the scope of the present disclosure should be defined by the claims.
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Address after: 101399 No.27, Linhe Development Zone, Shunyi District, Beijing Patentee after: CCTEG Beijing Tianma Intelligent Control Technology Co.,Ltd. Patentee after: BEIJING CCRI-TIANMA AUTOMATION TECHNOLOGY Co.,Ltd. Address before: 100013, Beijing, Chaoyang District, Hepingli Youth ditch East Road, building 5, one floor Patentee before: BEIJING TIANDI-MARCO ELECTRO-HYDRAULIC CONTROL SYSTEM Co.,Ltd. Patentee before: BEIJING CCRI-TIANMA AUTOMATION TECHNOLOGY Co.,Ltd. |
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