CN217735873U - High-response hydraulic actuator driven by electro-hydraulic servo valve - Google Patents
High-response hydraulic actuator driven by electro-hydraulic servo valve Download PDFInfo
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- CN217735873U CN217735873U CN202221343305.9U CN202221343305U CN217735873U CN 217735873 U CN217735873 U CN 217735873U CN 202221343305 U CN202221343305 U CN 202221343305U CN 217735873 U CN217735873 U CN 217735873U
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Abstract
The utility model relates to a high response hydraulic actuator based on electro-hydraulic servo valve drive, including first casing and second casing, the inside pump chamber that is formed with of first casing, main part oil storage chamber and energy storage chamber, the pump chamber is used for holding micropump, the micropump is driven by torque motor, the energy storage intracavity can be connected with first piston with sliding, first piston separates the energy storage chamber for first oil storage chamber and first air cavity, the inside hydraulic cavity that is formed with of second casing, the inside piston rod that can be connected with sliding of hydraulic cavity, still be connected with electro-hydraulic servo valve on the second casing, the oil-out of micropump communicates through electro-hydraulic servo valve and hydraulic cavity, the oil inlet and the main part oil storage chamber of micropump are linked together, electro-hydraulic servo valve still is linked together with the first oil storage chamber in energy storage chamber. The utility model discloses the degree of integrating is higher, has realized overall structure's lightweight and miniaturization, has also effectively realized hydraulic actuator's high-efficient response simultaneously.
Description
Technical Field
The utility model belongs to the technical field of the hydraulic control technique and specifically relates to indicate a high response hydraulic pressure executor based on electro-hydraulic servo valve drive.
Background
In an existing hydraulic control system with a hydraulic actuator, the hydraulic actuator is usually directly driven by a hydraulic pump, and high response of the hydraulic pump is difficult to achieve, so that the hydraulic actuator cannot achieve high response, and the execution efficiency is low. In addition, the hydraulic actuator is usually installed in a distributed mode, each component exists separately, the problem of leakage at multiple positions is prone to occurring, maintenance is not prone to occurring, meanwhile, the overall structure is large in size, large in occupied area, complex in structure and low in control reliability.
Therefore, the existing hydraulic actuator has low structural integration level, cannot realize high-efficiency response, and cannot meet the use requirement.
SUMMERY OF THE UTILITY MODEL
Therefore, the utility model aims to solve the technical problem that overcome among the prior art hydraulic actuator structure integration degree lower and can't realize the defect of high-efficient response.
In order to solve the technical problem, the utility model provides a high response hydraulic actuator based on electro-hydraulic servo valve drive, its characterized in that: the oil-saving type micro pump comprises a first shell and a second shell, wherein a pump cavity, a main body oil storage cavity and an energy storage cavity are formed in the first shell, the pump cavity is used for accommodating a micro pump, the micro pump is driven by a torque motor, a first piston is connected in the energy storage cavity in a sliding manner, the energy storage cavity is divided into a first oil storage cavity and a first inflation cavity by the first piston, a hydraulic cavity is formed in the second shell, a piston rod is connected in the hydraulic cavity in a sliding manner, an electro-hydraulic servo valve is further connected to the second shell, an oil outlet of the micro pump is communicated with the hydraulic cavity through the electro-hydraulic servo valve, an oil inlet of the micro pump is communicated with the main body oil storage cavity, and the electro-hydraulic servo valve is further communicated with the first oil storage cavity of the energy storage cavity.
In an embodiment of the present invention, a second piston is slidably connected in the main body oil storage cavity, the second piston separates the main body oil storage cavity into a second oil storage cavity and a second inflation cavity, and the oil inlet of the micro pump is communicated with the second oil storage cavity.
The utility model discloses an embodiment, still be connected with first pressure sensor on the pump chamber, first pressure sensor is used for detecting the oil pressure of the delivery port department of micropump.
In an embodiment of the present invention, a safety valve is further connected between the oil outlet of the micro pump and the second oil storage chamber.
In an embodiment of the present invention, the piston rod includes a piston body and a rod body connected to the piston body, the piston body separates the hydraulic cavity into a first execution chamber and a second execution chamber, the electrohydraulic servo valve includes a main oil inlet, a main oil return port, a first control oil port and a second control oil port, the first control oil port is communicated with the first execution chamber, the second control oil port is communicated with the second execution chamber, the main oil return port is communicated with the second oil storage chamber, the main oil inlet is communicated with the oil outlet of the micropump, and the main oil inlet is also communicated with the first oil storage chamber of the energy storage chamber.
In an embodiment of the present invention, the first execution chamber is connected to a second pressure sensor, and the second execution chamber is connected to a third pressure sensor.
In an embodiment of the present invention, the main oil inlet of the electro-hydraulic servo valve is communicated with the oil outlet of the micro-pump through a first flexible pipe, and the main oil return port is communicated with the second oil storage chamber through a second flexible pipe.
In an embodiment of the present invention, a cover is connected to both ends of the second casing, a sliding hole is provided on the cover, both ends of the piston body are connected to a rod body, the rod body at one end of the piston body is inserted into the sliding hole at one end of the second casing, and the rod body at the other end of the piston body is inserted into the sliding hole at the other end of the second casing.
In one embodiment of the present invention, the first inflation chamber and the second inflation chamber are filled with nitrogen gas.
In an embodiment of the present invention, a first end cap for closing the first inflation cavity is connected to the first inflation cavity.
Compared with the prior art, the technical scheme of the utility model have following advantage:
high response hydraulic actuator based on electro-hydraulic servo valve driven, realized the integrated arrangement of a plurality of hydraulic pressure parts, the degree of integrating is higher, has realized overall structure's lightweight and miniaturization, has also effectively realized hydraulic actuator's high-efficient response simultaneously.
Drawings
In order to make the content of the present invention more clearly understood, the present invention will be described in further detail with reference to the following specific embodiments of the present invention in conjunction with the accompanying drawings.
Fig. 1 is a schematic structural diagram of a high-response hydraulic actuator based on electro-hydraulic servo valve driving according to the present invention;
FIG. 2 is a schematic diagram of the internal structure of the hydraulic actuator shown in FIG. 1;
FIG. 3 is a schematic diagram of the connection of the electro-hydraulic servo valve and the hydraulic chamber;
the specification reference numbers indicate: 1. a torque motor; 2. a first housing; 21. a pump chamber; 22. a main body oil storage chamber; 221. a second piston; 222. a second oil storage chamber; 223. a second plenum chamber; 224. a second end cap; 23. an energy storage cavity; 231. a first piston; 232. a first oil storage chamber; 233. a first plenum chamber; 234. a first end cap; 3. a second housing; 31. a hydraulic chamber; 311. a first execution chamber; 312. a second execution chamber; 32. a piston rod; 321. a piston body; 322. a rod body; 33. a cover body; 4. a micro-pump; 5. an electro-hydraulic servo valve; 6. a first pressure sensor; 7. a second pressure sensor; 8. a third pressure sensor; 9. a safety valve; 10. a first flexible tube; 11. a second flexible tube.
Detailed Description
The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
Referring to fig. 1-2, the embodiment discloses a high-response hydraulic actuator driven by an electro-hydraulic servo valve 5, which comprises a first shell 2 and a second shell 3;
a pump cavity 21, a main body oil storage cavity 22 and an energy storage cavity 23 are formed in the first shell 2, the pump cavity 21 is used for accommodating the micro pump 4, the micro pump 4 is driven by the torque motor 1, a first piston 231 is connected in the energy storage cavity 23 in a sliding manner, the energy storage cavity 23 is divided into a first oil storage cavity 232 and a first inflation cavity 233 by the first piston 231, the first oil storage cavity 232 is used for storing hydraulic oil, and gas is filled in the first inflation cavity 233;
a hydraulic cavity 31 is formed inside the second shell 3, a piston rod 32 is connected inside the hydraulic cavity 31 in a sliding manner, and the hydraulic cavity 31 and the piston rod 32 form a hydraulic actuating element; the second shell 3 is also connected with an electro-hydraulic servo valve 5;
an oil outlet of the micro pump 4 is communicated with the hydraulic cavity 31 through the electro-hydraulic servo valve 5, and an oil inlet of the micro pump 4 is communicated with the main body oil storage cavity 22; the hydraulic oil in the main body oil storage chamber 22 enters the electro-hydraulic servo valve 5 through the micro pump 4 and is output to the hydraulic chamber 31 of the second housing 3 through the electro-hydraulic servo valve 5, so as to push the piston rod 32 to move.
The oil inlet of the electro-hydraulic servo valve 5 is also communicated with the first oil storage cavity 232 of the energy storage cavity 23, so that when the output hydraulic oil of the micro pump 4 is insufficient, the energy storage device is used for providing instantaneous energy for the electro-hydraulic servo valve 5, and the electro-hydraulic servo valve 5 is replenished with hydraulic oil.
The energy storage cavity 23 is divided into a first oil storage cavity 232 and a first gas charging cavity 233, the pressure of the first oil storage cavity 232 and the pressure of the first gas charging cavity 233 are the same under normal conditions, at this time, the first piston 231 is in a static state, once the actuator needs a large flow rate, the pressure at the oil discharge port of the micro pump 4 is low, so that the pressure at the oil inlet of the electro-hydraulic servo valve 5 is low, and therefore, hydraulic oil in the first oil storage cavity 232 can be automatically sucked into the electro-hydraulic servo valve 5 and enters the hydraulic cavity 31 of the second housing 3 through the electro-hydraulic servo valve 5 to perform an oil supplementing function, so that the high response of the actuator is effectively ensured, and the stability of the hydraulic system is improved.
The structure can effectively improve the dynamic response speed and the control precision by driving the piston rod 32 in the hydraulic actuating element by the electro-hydraulic servo valve 5, thereby effectively realizing the high response of the hydraulic actuator.
In addition, the structure of the hydraulic actuator integrates all the parts on the first shell 2 and the second shell 3 respectively, so that the integration degree of the structure is greatly improved, the miniaturization and the light weight of the structure are realized, and meanwhile, the reliability of the whole hydraulic actuator system is also effectively improved.
Further, the electro-hydraulic servo valve 5 is electrically connected to the controller, and the controller controls the electro-hydraulic servo valve 5 to operate, thereby changing the movement speed or the movement direction of the piston rod 32.
In one embodiment, a second piston 221 is slidably connected to the main body oil storage chamber 22, the second piston 221 divides the main body oil storage chamber 22 into a second oil storage chamber 222 and a second gas filling chamber 223, and an oil inlet of the micro pump 4 is communicated with the second oil storage chamber 222 to form a pressure oil tank structure, so as to conveniently adjust the oil supply pressure.
In one embodiment, the pump cavity 21 is further connected with a first pressure sensor 6, the first pressure sensor 6 is used for detecting oil pressure at an oil outlet of the micro pump 4, and an oil pressure signal is processed and then fed back to the torque motor 1 in real time, so that the torque motor 1 can change the rotation speed of the torque motor 1 according to the oil pressure at the oil outlet of the micro pump 4, and pressure at the oil outlet of the micro pump 4 can be automatically adjusted.
In one embodiment, a safety valve 9 is connected between the oil outlet of the micro-pump 4 and the second oil storage chamber 222 to provide overpressure protection for the electro-hydraulic servo valve 5.
In one embodiment, as shown in fig. 3, the piston rod 32 includes a piston body 321 and a rod body 322 connected to the piston body 321, the piston body 321 divides the hydraulic cavity 31 into a left chamber and a right chamber, which are the first execution chamber 311 and the second execution chamber 312, the electrohydraulic servo valve 5 includes a main oil inlet (P), a main oil return port (T), a first control oil port (a), and a second control oil port (B), the first control oil port (a) is communicated with the first execution chamber 311, the second control oil port (B) is communicated with the second execution chamber 312, the main oil return port (T) is communicated with the second oil storage chamber 222, the main oil inlet (P) is communicated with the oil outlet of the micro pump 4, and the main oil inlet (P) is further communicated with the first oil storage chamber 232 of the energy storage chamber 23.
When the hydraulic actuator works: if the command signal inputted to the electro-hydraulic servo valve 5 is positive, the electro-hydraulic servo valve 5 is actuated to communicate the main oil inlet (P port) with the first control oil port (A port) and the main oil return port (T port) with the second control oil port (B port). At this time, the pressure of the first control port (port a) is greater than the pressure of the second control port (port B). Hydraulic oil flows out from an oil outlet of the micro pump 4, flows into a main oil inlet (port P) of the electro-hydraulic servo valve 5, flows out from a first control oil port (port A) to a first execution chamber 311 at the left end of the hydraulic cavity 31, and hydraulic oil in a second execution chamber 312 flows out through a second control oil port (port B) and flows back to a second oil storage cavity 222 in the main oil storage cavity 22 through a main oil return port (port T); in the above process, the pressure of the first actuation chamber 311 is greater than the pressure of the second actuation chamber 312, thereby pushing the piston rod 32 to move to the right.
If the command signal inputted to the electro-hydraulic servo valve 5 is negative, the electro-hydraulic servo valve 5 is actuated to communicate the main oil inlet (P port) with the second control oil port (B port) and the main oil return port (T port) with the first control oil port (A port). At this time, the pressure of the second control port (port B) is greater than the pressure of the first control port (port a). The hydraulic oil flows out from the oil outlet of the micro pump 4, flows into the main oil inlet (P port) of the electro-hydraulic servo valve 5, then flows out from the second control oil port (B port) to the second execution chamber 312 at the right end of the hydraulic cavity 31, and the hydraulic oil in the first execution chamber 311 flows out through the first control oil port (a port) and flows back to the second oil storage cavity 222 in the main oil storage cavity 22 through the main oil return port (T port); the first actuation chamber 311 is pressurized less than the second actuation chamber 312 during the above process, thereby pushing the piston rod 32 to move to the left.
In one embodiment, the first actuation chamber 311 is connected to a second pressure sensor 7, the second actuation chamber 312 is connected to a third pressure sensor 8, the second pressure sensor 7 is used for detecting the oil pressure in the first actuation chamber 311, and the third pressure sensor 8 is used for detecting the oil pressure in the second actuation chamber 312.
Further, the second pressure sensor 7 and the third pressure sensor 8 are electrically connected to the controller, the second pressure sensor 7 and the third pressure sensor 8 transmit the detected oil pressure to the controller, the controller compares the received oil pressure with a preset oil pressure, and adjusts the pressures of the first control port and the second control port of the electrohydraulic servo valve 5 according to the comparison result, so as to accurately control the pressures of the first execution chamber 311 and the second execution chamber 312 in the hydraulic cavity 31, thereby ensuring the reliable operation of the piston rod 32.
In one embodiment, the main oil inlet of the electro-hydraulic servo valve 5 is communicated with the oil outlet of the micro-pump 4 through the first flexible pipe 10, and the main oil return port is communicated with the second oil storage chamber 222 through the second flexible pipe 11, so that the hydraulic oil flowing out of the main oil return port flows back to the second oil storage chamber 222 through the second flexible pipe 11.
The structure enables the first shell 2 and the second shell 3 to be connected through the flexible pipe, and the flexible pipe is flexible, so that relative position adjustment can be effectively and more conveniently carried out, and the installation flexibility is improved.
In one embodiment, the two ends of the second casing 3 are both connected with the cover 33, the cover 33 is provided with a sliding hole, the two ends of the piston body 321 are both connected with the rod 322, the rod 322 at one end of the piston body 321 is inserted into the sliding hole at one end of the second casing 3 and can slide, the rod 322 at the other end of the piston body 321 is inserted into the sliding hole at the other end of the second casing 3 and can slide, and the above structure ensures the convenience and reliability of installation.
In one embodiment, the first inflation chamber 233 and the second inflation chamber 223 are both filled with nitrogen, are chemically stable, and are not susceptible to chemical reaction with other substances.
In one embodiment, a first end cap 234 for closing the first inflation chamber 233 is attached to the first inflation chamber 233; further, a first endcap 234 is removably coupled to the first plenum 233.
In one embodiment, a second end cap 224 for closing the second inflation chamber 223 is connected to the second inflation chamber 223. Further, a second endcap 224 can be removably coupled to the second inflation lumen 223.
The high-response hydraulic actuator based on the driving of the electro-hydraulic servo valve 5 of the embodiment is characterized in that the structural main body is divided into the first shell 2 and the second shell 3, so that the integrated arrangement of a plurality of hydraulic components is realized, the oil circuit arrangement is relatively simple, the processing difficulty is reduced, the oil circuit arrangement length is shortened, the light weight and miniaturization of the whole structure are realized, meanwhile, the electro-hydraulic servo valve 5 is used as a main control element, the movement direction and the movement speed of the piston rod 32 are controlled by the electro-hydraulic servo valve 5, and the high-efficiency response of the hydraulic actuator can be effectively realized.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious changes and modifications can be made without departing from the scope of the invention.
Claims (10)
1. A high-response hydraulic actuator based on electro-hydraulic servo valve driving is characterized in that: the oil-saving type micro pump comprises a first shell and a second shell, wherein a pump cavity, a main body oil storage cavity and an energy storage cavity are formed in the first shell, the pump cavity is used for accommodating a micro pump, the micro pump is driven by a torque motor, a first piston is connected in the energy storage cavity in a sliding manner, the energy storage cavity is divided into a first oil storage cavity and a first inflation cavity by the first piston, a hydraulic cavity is formed in the second shell, a piston rod is connected in the hydraulic cavity in a sliding manner, an electro-hydraulic servo valve is further connected to the second shell, an oil outlet of the micro pump is communicated with the hydraulic cavity through the electro-hydraulic servo valve, an oil inlet of the micro pump is communicated with the main body oil storage cavity, and the electro-hydraulic servo valve is further communicated with the first oil storage cavity of the energy storage cavity.
2. The electro-hydraulic servo valve drive based high response hydraulic actuator of claim 1, wherein: the main part oil storage intracavity can be connected with the second piston with sliding, the second piston will the main part oil storage chamber is separated for second oil storage chamber and second and aerifys the chamber, the oil inlet of micro-pump with the second oil storage chamber is linked together.
3. The electro-hydraulic servo valve drive based high response hydraulic actuator of claim 2, wherein: the oil pump is characterized in that the pump cavity is also connected with a first pressure sensor, and the first pressure sensor is used for detecting the oil pressure at an oil outlet of the micro pump.
4. The electro-hydraulic servo valve drive based high response hydraulic actuator of claim 2, wherein: and a safety valve is connected between the oil outlet of the micro pump and the second oil storage cavity.
5. The electro-hydraulic servo valve drive based high response hydraulic actuator of claim 2, wherein: the piston rod includes the piston body and connects body of rod on the piston body, the piston body will the hydraulic pressure cavity is separated for first execution cavity and second execution cavity, the electro-hydraulic servo valve includes main oil inlet, main oil return opening, first control hydraulic fluid port and second control hydraulic fluid port, first control hydraulic fluid port with first execution cavity is linked together, the second control hydraulic fluid port with second execution cavity is linked together, main oil return opening with the second oil storage chamber is linked together, main oil inlet with the oil-out of micropump is linked together, main oil inlet still is linked together with the first oil storage chamber in energy storage chamber.
6. The electro-hydraulic servo valve drive based high response hydraulic actuator of claim 5, wherein: the first execution chamber is connected with a second pressure sensor, and the second execution chamber is connected with a third pressure sensor.
7. The electro-hydraulic servo valve drive based high response hydraulic actuator of claim 5, wherein: the main oil inlet of the electro-hydraulic servo valve is communicated with the oil outlet of the micro pump through a first flexible pipe, and the main oil return port is communicated with the second oil storage cavity through a second flexible pipe.
8. The electro-hydraulic servo valve drive based high response hydraulic actuator of claim 5, wherein: the two ends of the second shell are both connected with covers, sliding holes are formed in the covers, rod bodies are connected to the two ends of the piston body, the rod body at one end of the piston body penetrates through the sliding hole at one end of the second shell, and the rod body at the other end of the piston body penetrates through the sliding hole at the other end of the second shell.
9. The electro-hydraulic servo valve drive based high response hydraulic actuator of claim 2, wherein: and the first inflation cavity and the second inflation cavity are filled with nitrogen.
10. The electro-hydraulic servo valve drive based high response hydraulic actuator of claim 1, wherein: the first inflation cavity is connected with a first end cover used for sealing the first inflation cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221343305.9U CN217735873U (en) | 2022-05-31 | 2022-05-31 | High-response hydraulic actuator driven by electro-hydraulic servo valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221343305.9U CN217735873U (en) | 2022-05-31 | 2022-05-31 | High-response hydraulic actuator driven by electro-hydraulic servo valve |
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| Publication Number | Publication Date |
|---|---|
| CN217735873U true CN217735873U (en) | 2022-11-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221343305.9U Active CN217735873U (en) | 2022-05-31 | 2022-05-31 | High-response hydraulic actuator driven by electro-hydraulic servo valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217735873U (en) |
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2022
- 2022-05-31 CN CN202221343305.9U patent/CN217735873U/en active Active
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