CN213206154U - Buffer gear and loader of variable pump - Google Patents
Buffer gear and loader of variable pump Download PDFInfo
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- CN213206154U CN213206154U CN202021968426.3U CN202021968426U CN213206154U CN 213206154 U CN213206154 U CN 213206154U CN 202021968426 U CN202021968426 U CN 202021968426U CN 213206154 U CN213206154 U CN 213206154U
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Abstract
The utility model relates to a hydraulic system technical field especially relates to a buffer gear and loader of variable pump. The utility model provides a buffer gear of variable pump, including the oil outlet pipe, feedback pipe and control main valve between variable pump and oil cylinder, characterized by that, still set up the cushion valve between variable pump and control main valve; the buffer valve comprises a valve body, and the valve body is provided with a first port communicated with the oil outlet pipe and a second port communicated with the oil tank; the valve body is internally provided with a movable valve core, the valve core is provided with a through hole, and the valve core moves to different positions in the valve body so as to control the opening and closing of the first port and the second port. The buffer mechanism of the variable displacement pump is provided with the buffer valve, so that the phenomena of pressure impact, system vibration and the like of the system caused by abnormal increase of the pressure at the outlet of the pump are avoided. Two repelling permanent magnets arranged on the buffer valve realize extra thrust, and compared with a spring, the buffer valve reduces the resistance of opening the valve in the unloading process and increases the unloading reaction speed.
Description
Technical Field
The utility model relates to a hydraulic system technical field especially relates to a buffer gear of variable pump.
Background
Work devices of construction machines such as loaders are currently powered by hydraulic systems in which a variable displacement pump is used as a power source. When the work device starts to act, the variable displacement pump starts to increase from zero displacement to the required displacement, typically the maximum displacement.
The inventors have found that at the end of the work implement event, a transition time is required for the variable displacement pump to begin decreasing from the current displacement to zero displacement. However, the instant valve core of the main valve is controlled to be closed, so that the flow of the pump outlet cannot be discharged, the oil pressure of the pump outlet rises instantly and steeply, the vibration abnormal sound of the whole machine occurs, the related sealing element is damaged, the oil leaks, and the service life of the pump is shortened.
Disclosure of Invention
The utility model discloses a when solving current engineering machine tool equipment action and ending, the control main valve case is closed in the twinkling of an eye, because pump export flow can't be excreted, leads to the pump oil pressure to rise suddenly in the twinkling of an eye, and the complete machine vibrations cause the problem of damage risk to equipment.
In order to achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
a buffer gear of variable pump, including the oil outlet pipe, feedback pipe and control main valve between oil cylinder and the variable pump, characterized by that, set up the cushion valve between variable pump and control main valve;
the buffer valve comprises a valve body, and the valve body is provided with a first port communicated with the oil outlet pipe and a second port communicated with the oil tank;
the valve body is internally provided with a movable valve core, the valve core is provided with a through hole, and the valve core moves to different positions in the valve body so as to control the opening and closing of the first port and the second port;
one end of the valve core is communicated with an oil outlet pipe oil way and is stressed by oil pressure in the oil outlet pipe; the other end of the oil pipe is communicated with an oil way of the feedback pipe and is stressed by the oil pressure in the feedback pipe; and a thrust device is arranged at the feedback pipe end of the valve core to provide thrust for pushing the valve core to move towards the oil outlet pipe end.
In a further improvement, the valve core is cylindrical, the valve body is provided with a cavity which is adaptive to the shape of the valve core and allows the valve core to move, and the cylindrical surface of the valve core is movably and hermetically contacted with the cylindrical surface wall of the cavity.
In a further improvement, the thrust device comprises a compression spring, one end of the compression spring is connected with the valve core, and the other end of the compression spring is connected with the valve body.
In a further improvement, the thrust device comprises two repulsive permanent magnets, wherein one permanent magnet is arranged at the feedback pipe end of the valve core, and the other permanent magnet is arranged on the valve body at a position corresponding to the feedback pipe end of the valve core.
In a further improvement, the variable displacement pump is communicated with the oil tank.
In a further improvement, the control main valve is communicated with the oil tank.
In a further improvement, when the through hole is positioned at a position corresponding to the first port and the second port, the buffer valve is in an open state; when the through hole is in a position staggered with the first port and the second port, the buffer valve is in a closed state.
The valve is further improved, one end of the compressed spring is connected with the valve core in a welding mode, and the other end of the compressed spring is connected with the valve body in a welding mode.
In a further improvement, one of the two repellent permanent magnets is embedded at the feedback pipe end of the valve core, and the other permanent magnet is embedded at the position, corresponding to the feedback pipe end of the valve core, on the valve body.
The utility model also provides a loader, buffer gear including aforementioned variable pump.
Compared with the prior art, the beneficial effect of above one or more technical scheme:
(1) the buffer mechanism of the variable displacement pump is provided with the buffer valve, the buffer valve is instantly switched to the left position when the main valve of the system is closed, the pump outlet oil pipe is communicated with the hydraulic oil tank through the buffer valve, the pump outlet oil liquid is unloaded to the oil tank at low pressure, and the phenomena that pressure impact, system vibration and the like occur to the system due to the fact that the pressure at the pump outlet is abnormally increased are avoided to cause damage to related sealing elements.
(2) Two repelling permanent magnets arranged on the buffer valve realize extra thrust, and compared with a spring, the buffer valve reduces the resistance of opening the valve in the unloading process and increases the unloading reaction speed.
(3) The loader improves the micro-control performance and the comfort performance of the whole machine by arranging the buffer mechanism of the variable pump.
Drawings
FIG. 1 is a schematic diagram of a pipeline structure of a conventional variable displacement pump driving cylinder;
fig. 2 is a schematic view of a damping mechanism of a variable displacement pump according to an embodiment of the present invention;
FIG. 3 is a schematic view of the state of the cushion valve in the normal operation of the whole machine of the embodiment of the present invention;
FIG. 4 is a schematic diagram of the state of the cushion valve when the main valve is controlled to be closed according to the embodiment of the present invention;
fig. 5 is a schematic diagram of a state in which the thrust device of the cushion valve is two permanent magnets that repel each other according to the embodiment of the present invention;
in the figure:
1 oil cylinder, 2 control main valve, 3 oil outlet pipe, 4 feedback pipe, 5 variable pump, 6 buffer valve, 7 oil tank, 8 thrust device.
Detailed Description
Example 1
The structure of the pipeline of the prior variable pump driving oil cylinder is shown in figure 1, the oil cylinder 1 is an actuating mechanism, a main control valve 2 belongs to a control mechanism, namely whether the oil cylinder acts or not is controlled, an oil outlet pipe 3 of the pump outputs high-pressure oil to push the oil cylinder to act, and a feedback pipe 4 of the pump provides an oil return pipeline.
When the working device starts to act, the displacement of the variable displacement pump 5 is increased from 0 to the required displacement, generally the maximum displacement; when the working device finishes acting, the variable displacement pump needs conversion time when the current displacement is reduced to 0, but the instant valve core of the main valve is controlled to be closed, so that the flow of the pump outlet cannot be discharged, the oil pumping pressure is instantly and steeply raised, the vibration abnormal sound of the whole machine occurs, the related sealing element is damaged, the oil leakage occurs, and the service life of the pump is shortened.
The first embodiment of the present invention provides a buffer mechanism of a variable pump, as shown in fig. 2, comprising an oil outlet pipe 3, a feedback pipe 4 and a control main valve 2 between a variable pump 5 and an oil cylinder 1, and a buffer valve 6 between the variable pump 5 and the control main valve 2; the variable pump 5 is communicated with an oil tank 7, and the control main valve 2 is communicated with the oil tank.
The cushion valve 6 comprises a valve body having a first port communicating with the oil outlet pipe and a second port communicating with the oil tank; the valve body is internally provided with a movable valve core, the valve core is provided with a through hole, and the valve core moves to different positions in the valve body so as to control the opening and closing of the first port and the second port; one end of the valve core is communicated with an oil outlet pipe oil way and is stressed by oil pressure in the oil outlet pipe; the other end of the oil pipe is communicated with an oil way of the feedback pipe and is stressed by the oil pressure in the feedback pipe; at the feedback pipe end of the spool, a thrust device 8 is also provided to provide a thrust force that urges the spool to move towards the outlet pipe end. The valve core is cylindrical, the valve body is provided with a cavity which is adaptive to the shape of the valve core and allows the valve core to move, and the cylindrical surface of the valve core is in movable and sealing contact with the cylindrical surface wall of the cavity.
The oil tank in which the control main valve, the buffer valve and the variable pump are respectively connected is actually the same oil tank as shown in fig. 2.
The working principle of the buffer mechanism of the variable displacement pump is as follows:
in the normal working state, the main valve 2 is controlled to be opened, the variable pump 5 and the oil cylinder 1 work normally, and the buffer valve 6 is in the closed state.
When the main valve 2 is controlled to be closed, the buffer valve 6 is opened by the pressure of the system, and in the process that the output quantity of the variable pump 5 is gradually reduced, oil flows back to the oil tank from the oil outlet pipe 3 through the buffer valve 6, so that unloading is realized, and the impact of instant pressurization on the device is relieved.
Because the buffer mechanism of the variable displacement pump is provided with the buffer valve, the buffer valve is instantly switched to the left position when the main valve of the system is closed, the pump outlet oil pipe is communicated with the hydraulic oil tank through the buffer valve, the pump outlet oil is unloaded to the oil tank at low pressure, and the phenomena of pressure impact, system vibration and the like of the system caused by abnormal pressure increase at the pump outlet are avoided to cause damage to related sealing elements.
The working principle of the cushion valve is as follows:
in a normal working state, the pressure of the oil outlet pipe is slightly greater in the pressures of the oil outlet pipe 3 and the feedback pipe 4, the valve core is pushed to the direction of the end of the oil outlet pipe by an additionally arranged thrust device, the through hole of the valve core is in a position staggered with the first port and the second port, and the buffer valve is in a closed state, as shown in fig. 3.
When the main control valve 2 is closed, the pressure in the oil outlet pipe 3 is increased instantly, the pressure in the feedback pipe 4 is zero, the pressure in the oil outlet pipe 3 overcomes the thrust of the thrust device, the valve core is pushed to the direction of the end of the feedback pipe, and when the hole is at the position corresponding to the first port and the second port, the buffer valve is in an open state, as shown in fig. 4.
The thrust device has two realization modes.
The first implementation manner of the thrust device is to use a compression spring, one end of the compression spring is connected with the valve core in a welding way, and the other end of the compression spring is connected with the valve body in a welding way, as shown in fig. 3 and 4.
The mode is easy to realize and simple to install. However, as the compression degree of the spring is larger and larger, the change of the elastic force is very obvious, but the pressure of the oil outlet pipe is gradually reduced, so that the buffer valve can not be completely opened, and the unloading reaction speed is influenced.
The second implementation manner of the thrust device is to use two opposing permanent magnets, one of which is embedded in the feedback pipe end of the valve core, and the other permanent magnet is embedded in the valve body at a position corresponding to the feedback pipe end of the valve core, as shown in fig. 5. Although the repulsion between the permanent magnets is increased along with the reduction of the distance, the force factor is the magnetic flux density, and the change rate of the force along with the distance is far smaller than that of the elastic force of the spring along with the compression distance. Compared with a spring, the valve opening resistance in the unloading process is reduced, and the unloading reaction speed is increased.
Example 2
A second embodiment of the present invention provides a loader including the damping mechanism of the variable displacement pump of the first embodiment. Through the arrangement of the buffer mechanism of the variable pump, the micro-control performance and the comfort performance of the whole loader are improved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A buffer gear of variable pump, including the oil outlet pipe, feedback pipe and control main valve between oil cylinder and the variable pump, characterized by that, set up the cushion valve between variable pump and control main valve;
the buffer valve comprises a valve body, and the valve body is provided with a first port communicated with the oil outlet pipe and a second port communicated with the oil tank;
the valve body is internally provided with a movable valve core, the valve core is provided with a through hole, and the valve core moves to different positions in the valve body so as to control the opening and closing of the first port and the second port;
one end of the valve core is communicated with an oil outlet pipe oil way and is stressed by oil pressure in the oil outlet pipe; the other end of the oil pipe is communicated with an oil way of the feedback pipe and is stressed by the oil pressure in the feedback pipe; and a thrust device is arranged at the feedback pipe end of the valve core to provide thrust for pushing the valve core to move towards the oil outlet pipe end.
2. The damping mechanism for a variable displacement pump according to claim 1, wherein the valve body has a cylindrical shape, the valve body has a cavity adapted to the shape of the valve body and allowing movement thereof, and the cylindrical surface of the valve body is in movable and sealing contact with the cylindrical surface wall of the cavity.
3. The damping mechanism for a variable displacement pump according to claim 1, wherein the thrust means comprises a compression spring having one end connected to the valve element and the other end connected to the valve body.
4. The damping mechanism of a variable displacement pump according to claim 1, wherein the thrust means comprises two opposing permanent magnets, one of which is mounted on the feedback port of the spool and the other of which is mounted on the valve body at a position corresponding to the feedback port of the spool.
5. The damping mechanism for a variable displacement pump according to claim 1, wherein the variable displacement pump is in communication with a tank.
6. The damping mechanism for a variable displacement pump according to claim 1, wherein the control main valve is in communication with a tank.
7. The damping mechanism of a variable displacement pump according to claim 1, wherein the damping valve is in an open state when the through hole is at a position corresponding to the first port and the second port; when the through hole is in a position staggered with the first port and the second port, the buffer valve is in a closed state.
8. The damping mechanism for a variable displacement pump according to claim 3, wherein the compression spring is welded to the spool at one end and to the valve body at the other end.
9. The damping mechanism of a variable displacement pump according to claim 4, wherein the two opposing permanent magnets are one of which is embedded in the feedback tube end of the spool and the other of which is embedded in the valve body at a position corresponding to the feedback tube end of the spool.
10. A loader comprising a damping mechanism of a variable displacement pump according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021968426.3U CN213206154U (en) | 2020-09-09 | 2020-09-09 | Buffer gear and loader of variable pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021968426.3U CN213206154U (en) | 2020-09-09 | 2020-09-09 | Buffer gear and loader of variable pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213206154U true CN213206154U (en) | 2021-05-14 |
Family
ID=75819604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021968426.3U Active CN213206154U (en) | 2020-09-09 | 2020-09-09 | Buffer gear and loader of variable pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213206154U (en) |
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2020
- 2020-09-09 CN CN202021968426.3U patent/CN213206154U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: No.75, Huanghe East Road, Huangdao District, Qingdao City, Shandong Province 266599 Patentee after: Lovol Heavy Industry Group Co.,Ltd. Address before: No.75, Huanghe East Road, Huangdao District, Qingdao City, Shandong Province 266599 Patentee before: LOVOL Engineering Machinery Group Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |