CN217002464U - Multifunctional mobile hydraulic workstation - Google Patents
Multifunctional mobile hydraulic workstation Download PDFInfo
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- CN217002464U CN217002464U CN202220202517.9U CN202220202517U CN217002464U CN 217002464 U CN217002464 U CN 217002464U CN 202220202517 U CN202220202517 U CN 202220202517U CN 217002464 U CN217002464 U CN 217002464U
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Abstract
The utility model discloses a multifunctional mobile hydraulic workstation which comprises a hydraulic trolley, a workstation oil tank, a motor, a coupler, a gear pump, an S oil port, a T oil port, an S oil port reversing valve, a T oil port reversing valve and an operation platform, wherein the hydraulic trolley is arranged on the workstation oil tank; the hydraulic trolley is provided with a box body structure, and a workstation oil tank is arranged in the box body structure; the motor is arranged on the upper part of the box body structure and is connected with the gear pump through a coupler; the S oil port is connected with an S oil port reversing valve, the S oil port reversing valve is connected with a gear pump through a pipeline, and the gear pump is connected with a workstation oil tank through a pipeline; the T oil port is connected with a T oil port reversing valve through a pipeline; the operation panel comprises a display, a controller and operation keys.
Description
Technical Field
The utility model relates to the field of aviation ground equipment, in particular to a multifunctional mobile hydraulic workstation.
Background
At present, in airport ground equipment at home and abroad, a hydraulic system is basically used, along with the increase of the equipment, the service time is prolonged, the hydraulic system has faults, a special oiling machine, a special hydraulic test table and special hydraulic cleaning and pressurizing equipment are added for solving the problem of the hydraulic system, and the equipment is higher in cost, larger in size and required to be operated and maintained by a specially-assigned person, so that the maintenance cost of the equipment is increased.
Therefore, the technical problems of how to improve the stability of the hydraulic system in the equipment, increase the normal operation time of the equipment, quickly service the hydraulic system and reduce the maintenance cost of the hydraulic system are solved.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model provides a multifunctional mobile hydraulic workstation which comprises a hydraulic trolley, a workstation oil tank, a motor, a coupler, a gear pump, an S oil port, a T oil port, an S oil port reversing valve, a T oil port reversing valve and an operation table;
the hydraulic trolley is provided with a box body structure, and a workstation oil tank is arranged in the box body structure;
the motor is arranged on the upper part of the box body structure and is connected with the gear pump through a coupler;
the S oil port is connected with an S oil port reversing valve, the S oil port reversing valve is connected with a gear pump through a pipeline, and the gear pump is connected with a workstation oil tank through a pipeline;
the T oil port is connected with a T oil port reversing valve through a pipeline;
the operation panel comprises a display, a controller and operation keys.
Preferably, the multifunctional mobile hydraulic workstation further comprises a one-way valve, a high-pressure filter, a main reversing valve, a normally open reversing valve, a particle detection sensor, an oil return filter and an air-cooling heat exchanger; the gear pump is connected with an oil tank of a workstation through a pipeline, and the one-way valve, the high-pressure filter, the main reversing valve, the normally open reversing valve, the particle detection sensor, the oil return filter, the T oil port reversing valve and the air-cooling heat exchanger are sequentially connected in series.
Preferably, a liquid level sensor and an air cleaner are mounted on the upper portion of the case structure.
Preferably, the multifunctional mobile hydraulic workstation further comprises a flow sensor, and the flow sensor is connected in series on a pipeline connecting the T oil port and the T oil port reversing valve.
Preferably, the multifunctional mobile hydraulic workstation further comprises an oil port B, an oil port A1, an oil port A2, an oil port A3, a reversing valve for the oil port B16, a reversing valve for the oil port A1, a reversing valve for the oil port A2 and a reversing valve for the oil port A3; the oil port B is connected in series with a reversing valve of the oil port B to a main reversing valve through a pipeline; the A1 oil port is connected in series with the reversing valve of the A1 oil port to the main reversing valve through a pipeline; the A2 oil port is connected in series with the reversing valve of the A2 oil port to the main reversing valve through a pipeline; the A3 oil port is connected in series with the reversing valve of the A3 oil port to the main reversing valve through a pipeline;
preferably, the multifunctional mobile hydraulic workstation further comprises an air inlet and a pneumatic reversing valve; the air inlet is connected in series with the pneumatic reversing valve to the main reversing valve through a pipeline.
Preferably, the multifunctional mobile hydraulic workstation further comprises a normally closed directional control valve; the normally closed reversing valve is connected between the main reversing valve and the workstation oil tank in series.
Preferably, the multifunctional mobile hydraulic workstation further comprises a safety valve, and the safety valve is connected between the gear pump and the T oil port reversing valve in series.
Preferably, the multifunctional mobile hydraulic workstation further comprises a visual liquid level meter, and the visual liquid level meter is arranged on the workstation oil tank. The multifunctional mobile hydraulic workstation further comprises an oil drain ball valve, and the oil drain ball valve is arranged on an oil tank of the workstation.
Compared with the prior art, the technical scheme of the utility model highly integrates various functions such as refueling, flushing, power station and pressurizing in the movable operation cart, adopts visual operation, reduces operation difficulty, comprehensively serves a hydraulic system, ensures stable operation of the hydraulic system, really realizes multiple purposes, reduces maintenance cost of equipment and improves maintenance efficiency of the equipment.
Drawings
FIG. 1 is a schematic structural view of a multifunctional mobile hydraulic workstation
Fig. 2 is a hydraulic and electric control schematic diagram of the multifunctional mobile hydraulic workstation.
Description of the reference numerals
1. Hydraulic pushing; 2. a gear pump; 3. a controller; 4. a liquid level sensor; 5. an air cleaner; 6. an operation table; 7.a coupling; 8.a motor; 9.a high pressure filter; 10. an air-cooled heat exchanger; a T oil port reversing valve; 12. an oil return filter; 13. a particle detection sensor; 14. a pneumatic directional control valve; 15, an S oil port reversing valve; a reversing valve of the oil port B; 17, A3 oil port reversing valve; 18.A2 port reversing valve; 19, A1 oil port reversing valve; 20. a main directional control valve; 21. a normally open directional valve; 22. a one-way valve; 23. a normally closed directional control valve; 24. a safety valve; 25. a flow sensor; 26. a visual level gauge; 27. oil drain ball valve
Detailed Description
As shown in fig. 1 and fig. 2, the multifunctional mobile hydraulic workstation of the present embodiment includes a hydraulic cart 1, a workstation oil tank, a motor 8, a coupler 7, a gear pump 2, an S oil port, a T oil port, an S oil port reversing valve 15, a T oil port reversing valve 11, and an operation table 6;
the hydraulic trolley 1 is provided with a box body structure, and a workstation oil tank is arranged in the box body structure; the motor 8 is arranged at the upper part of the box body structure, and the motor 8 is connected with the gear pump 2 through a coupler 7; the S oil port is connected with an S oil port reversing valve 15, the S oil port reversing valve 15 is connected with a gear pump 2 through a pipeline, and the gear pump 2 is connected with a workstation oil tank through a pipeline; the T oil port is connected with a T oil port reversing valve 11 through a pipeline; the console 6 includes a display, a controller 3, and operation keys.
The multifunctional mobile hydraulic workstation further comprises a one-way valve 22, a high-pressure filter 9, a main reversing valve 20, a normally open reversing valve 21, a particle detection sensor 13, an oil return filter 12 and an air-cooled heat exchanger 10; in the process that the gear pump 2 is connected with a workstation oil tank through a pipeline, the one-way valve 22, the high-pressure filter 9, the main reversing valve 20, the normally open reversing valve 21, the particle detection sensor 13, the oil return filter 12, the T oil port reversing valve 11 and the air-cooling heat exchanger 10 are sequentially connected in series.
And a liquid level sensor 4 and an air filter 5 are arranged at the upper part of the box body structure.
The multifunctional mobile hydraulic workstation further comprises a flow sensor 25, and the flow sensor 25 is connected in series with a pipeline connecting the T oil port and the T oil port reversing valve 11.
The multifunctional mobile hydraulic workstation further comprises an oil port B, an oil port A1, an oil port A2, an oil port A3, a reversing valve of the oil port B16, a reversing valve of the oil port A1 19, a reversing valve of the oil port A2 and a reversing valve of the oil port A3 17;
the oil port B is connected in series with a reversing valve 16 of the oil port B to a main reversing valve 20 through a pipeline; the A1 oil port is connected in series with the reversing valve 19 of the A1 oil port to the main reversing valve 20 through a pipeline; the A2 oil port is connected in series with the reversing valve 18 with the A2 oil port to the main reversing valve 20 through a pipeline; the A3 oil port is connected in series with the reversing valve 17 of the A3 oil port to the main reversing valve 20 through a pipeline;
the multifunctional mobile hydraulic workstation further comprises an air inlet and a pneumatic reversing valve 14; the air inlet is connected in series through a conduit from the pneumatic directional valve 14 to the main directional valve 20.
The multifunctional mobile hydraulic workstation further comprises a normally closed reversing valve 23; the normally closed reversing valve 23 is connected in series between the main reversing valve 20 and the workstation oil tank. The multifunctional mobile hydraulic workstation further comprises a safety valve 24, and the safety valve 24 is connected between the gear pump 2 and the T oil port reversing valve 11 in series to protect the pressure of the whole system.
Multi-functional removal hydraulic pressure workstation still includes visual level gauge 26, visual level gauge 26 sets up on the workstation oil tank, what of observation oil tank medium that can be convenient. The multifunctional mobile hydraulic workstation further comprises an oil drain ball valve 27, wherein the oil drain ball valve 27 is arranged on an oil tank of the workstation, and can be used for discharging all media in the oil tank and cleaning the oil tank.
The multifunctional mobile hydraulic workstation of the specific embodiment is a comprehensive performance mobile hydraulic workstation integrating mechanical, electrical and hydraulic functions, can realize various functions such as oiling, flushing and power station, can conveniently switch between automatic and manual modes according to the use requirements of users, and specifically describes the working process of each function in detail below.
The oiling function comprises three sub-functions of oiling the workstation, oiling the hydraulic oil stored in the workstation to the equipment and oiling the hydraulic oil in a standard oil drum or other oil tanks to the equipment.
Refuel for self workstation, during this function mainly is with the hydraulic oil filling to the workstation in the standard oil drum or other oil tanks, make self have sufficient medium to operate. The working process comprises the following steps: firstly, the S port is connected with an oil drum or an oil tank through an S oil absorption steel pipe or a hose, a motor 8 is started, the motor enables a gear pump 2 to run through a coupler 7, so that hydraulic oil in the oil drum or the oil tank enters the gear pump through the S port and an S oil port reversing valve 15, the hydraulic oil is output under the action of the gear pump and sequentially passes through a check valve 22, a high-pressure filter 9, a main reversing valve 20, a normally open reversing valve 21, a particle detection sensor 13, an oil return filter 12, a T oil port reversing valve 11 and an air-cooled heat exchanger 10, and then enters the oil tank of a workstation, when the liquid level sensor 4 detects that the requirement is met, the motor stops, and oil filling is completed.
The hydraulic oil stored in the workstation is added to the equipment, and the function is mainly to add the hydraulic oil in the oil tank of the workstation to the required equipment, so that the equipment can normally operate. The working process comprises the following steps: firstly, a T port is connected with an oil tank of equipment through a T port oil outlet steel pipe or a hose, a motor 8 is started, the motor 8 enables a gear pump 2 to operate through a coupler 7, so that hydraulic oil in the oil tank of the workstation enters the gear pump through an S oil suction port reversing valve 15, the hydraulic oil is output through the action of the gear pump, sequentially passes through a one-way valve 22, a high-pressure filter 9, a main reversing valve 20, a normally open reversing valve 21, a particle detection sensor 13, an oil return filter 12, a T port reversing valve 11, a flow sensor 25, the T port and the T oil outlet steel pipe or hose, then enters the oil tank of the equipment, and when the flow sensor 25 detects that the requirements are met, the motor stops and oil filling is completed.
The hydraulic oil in the standard oil barrel or other oil tanks is filled into the equipment, and the function is mainly to fill the hydraulic oil in the standard oil barrel or other oil tanks into the required equipment, so that the equipment can normally run. The working process comprises the following steps: firstly, the S port is connected with an oil drum or an oil tank through an oil suction steel pipe or a hose, the T port is connected with an oil tank of equipment through a T port oil outlet steel pipe or a hose, a motor 8 is started, the motor enables a gear pump 2 to operate through a coupler 7, so that hydraulic oil in the oil drum or the oil tank enters the gear pump through the S port and an S oil suction port reversing valve 15, the hydraulic oil is output through the action of the gear pump, sequentially passes through a one-way valve 22, a high-pressure filter 9, a main reversing valve 20, a normally open reversing valve 21, a particle detection sensor 13, an oil return filter 12, a T oil port reversing valve 11, a flow sensor 25, the T port and a T oil outlet steel pipe or hose, then enters the equipment oil tank, and when the detection of the flow sensor 25 meets the requirement, the motor stops and the oil filling is completed.
The flushing function comprises four functions of filtering hydraulic oil in the workstation, filtering hydraulic oil in an equipment oil tank, flushing and filtering the equipment pipeline and clearing away the hydraulic oil in the equipment pipeline.
The hydraulic oil in the workstation is filtered, and the function is mainly to circularly filter the hydraulic oil in the workstation to ensure that the hydraulic oil is in a clean state and the cleanliness required by long-term operation is achieved. The working process comprises the following steps: firstly, confirming that enough media exist in a workstation, starting a motor 8, enabling the motor to enable a gear pump 2 to operate through a coupler 7, enabling hydraulic oil in an oil tank of the workstation to enter the gear pump through an S oil suction port reversing valve 15, outputting the hydraulic oil through the action of the gear pump, sequentially passing through a check valve 22, a high-pressure filter 9, a main reversing valve 20, a normally open reversing valve 21, a particle detection sensor 13, an oil return filter 12, a T oil port reversing valve and an air cooling heat exchanger 10, and then entering the oil tank of the workstation, so that the hydraulic oil in the workstation is always in a circulating filtering state, when the particle detection sensor 13 detects that the hydraulic oil meets the requirement, stopping the motor, and completing the function.
The hydraulic oil in the oil tank of the equipment is filtered, and the function is mainly to circularly filter the hydraulic oil in the equipment to ensure that the hydraulic oil is in a clean state and the cleanliness required by long-term operation is achieved. The working process comprises the following steps: firstly, the S port is connected with an oil suction port or an oil discharge port of an equipment oil tank through a hose, the T port is connected with an oil return port of the equipment oil tank through a hose, meanwhile, sufficient media are confirmed in the equipment, a motor 8 is started, the motor enables a gear pump 2 to operate through a coupler 7, so that hydraulic oil in the equipment oil tank enters the gear pump through an S oil suction port reversing valve 15, then the hydraulic oil is output through the action of the gear pump, sequentially passes through a one-way valve 22, a high-pressure filter 9, a main reversing valve 20, a normally open reversing valve 21, a particle detection sensor 13, an oil return filter 12, a T oil port reversing valve 11, a flow sensor 25, the T port and a T oil outlet hose, and then returns to the equipment oil tank, so that the hydraulic oil in the equipment is always in a circulating filtration state, when the particle detection sensor 13 meets the requirement, the motor stops, and the function is completed.
The pipeline of the equipment is washed and filtered, and the function is mainly to wash and filter the pipeline on the equipment, so that the pipeline is in a clean state, and the long-term normal operation of the equipment is guaranteed. The working process comprises the following steps: firstly, the oil port B and the oil ports A1-A3 are connected with an equipment pipeline through hoses, and the motor 8 is started after confirming that enough media exist in a workstation, the motor enables the gear pump 2 to operate through the coupling 7, so that the hydraulic oil in the oil tank of the workstation enters the gear pump through the S oil suction port reversing valve 15, is output under the action of the gear pump, sequentially passes through the check valve 22, the high-pressure filter 9, the main reversing valve 20, the B oil port reversing valve 16, enters the equipment pipeline through the B port, returns to the main reversing valve 20 through the reversing valves A1-A3, returns to the normally open reversing valve 21, the particle detection sensor 13, the return oil filter 12, the T oil port reversing valve 11 and the air-cooled heat exchanger 10, and then returning to the oil tank of the workstation, so that the equipment pipeline is always in a high-speed flushing state, and when the particle detection sensor 13 detects that the requirement is met, the motor stops and the equipment pipeline is flushed.
Clear away the inside hydraulic oil of equipment pipeline, this function is mainly clear away the hydraulic oil in the pipeline on the equipment with pure compressed air, is in the oilless state in the messenger pipeline, and the pipeline of being convenient for is dismantled or whole oil change work. The working process comprises the following steps: firstly, an oil port B and an oil port A1-A3 are connected with an equipment pipeline through hoses, an Air inlet (Air inlet) is connected with a pure compressed Air pipeline through an Air pipe, the pressure of compressed Air is confirmed to be within an allowable range, a pneumatic reversing valve 14 is opened, the compressed Air sequentially passes through a main reversing valve 20, a reversing valve 19, enters the equipment pipeline through the port B, returns to the main reversing valve 20 through a reversing valve A1-A3 and then returns to a work station oil tank, all hydraulic oil in the equipment pipeline is blown into the work station oil tank through the compressed Air, the pneumatic reversing valve 14 is closed, and oil in the pipeline is removed.
The power station function comprises the functions of performing functional test on a hydraulic oil cylinder in the equipment and performing pressure test on a pipeline in the equipment.
The functional test is carried out on the hydraulic oil cylinder in the equipment, and the function is mainly to carry out the functional test on the oil cylinder on the equipment, so that the normal work of an executive component is guaranteed. The working process comprises the following steps: firstly, an oil port B and an oil port A1 or an oil port A2 or an oil port A3 are connected with an equipment oil cylinder through hoses, sufficient media are confirmed in a workstation, a motor 8 is started, the motor enables a gear pump 2 to operate through a coupler 7, so that hydraulic oil in an oil tank of the workstation enters the gear pump through an S oil suction port reversing valve 15, the hydraulic oil is output through the action of a gear pump, sequentially passes through a check valve 22, a high-pressure filter 9, a main reversing valve 20, an oil port B reversing valve 16, enters the equipment oil cylinder through an oil port B, hydraulic oil in the other cavity of the oil cylinder returns to the main reversing valve 20, a normally open reversing valve 21, a particle detection sensor 13, an oil return filter 12, an oil port T reversing valve 11 and an air cooling heat exchanger 10 through the reversing valve of A1 or A2 or A3, then returns to the oil tank of the workstation, the direction of the main reversing valve is switched, so that the equipment oil cylinder can extend or retract, and the oil cylinder is convenient to test the oil cylinder, and when the test purpose is achieved, the motor stops, and the test of the equipment oil cylinder is completed.
The pressure testing device has the advantages that the pressure testing is carried out on the pipeline in the equipment, the function is mainly that the pressure testing is carried out on the pipeline on the equipment, and the leakage phenomenon at the joint of the pipeline is detected, so that the whole equipment can normally run. The working process comprises the following steps: firstly, an oil port B and an oil port A1-A3 are connected with an equipment pipeline through hoses, sufficient media are confirmed in a workstation, a motor 8 is started, the motor enables a gear pump 2 to operate through a coupler 7, so that hydraulic oil in an oil tank of the workstation enters the gear pump through an S oil suction port reversing valve 15, then is output under the action of the gear pump, sequentially passes through a check valve 22, a high-pressure filter 9, a main reversing valve 20, an oil port B reversing valve 16, enters the equipment pipeline through an oil port B, then is loaded to the maximum test pressure and is maintained, meanwhile, whether leakage phenomenon exists at each connection part of the equipment pipeline is checked, and after the check is qualified, the hydraulic oil returns to the main reversing valve 20, the normally open reversing valve 21, a particle detection sensor 13, an oil return filter 12, a T oil port reversing valve 11 and an air-cooled heat exchanger 10 through the reversing valves A1-A3 and then returns to the oil tank of the workstation, and (4) relieving the pressure of the equipment pipeline, and stopping the motor after the pressure test is finished.
The present invention has been described in detail with reference to the specific embodiments and examples, but these are not intended to limit the present invention. Many variations and modifications may be made by one of ordinary skill in the art without departing from the principles of the present invention, which should also be considered as within the scope of the present invention.
Claims (10)
1. The utility model provides a multi-functional removal hydraulic pressure workstation which characterized in that:
the multifunctional mobile hydraulic workstation comprises a hydraulic trolley, a workstation oil tank, a motor, a coupler, a gear pump, an S oil port, a T oil port, an S oil port reversing valve, a T oil port reversing valve and an operation platform;
the hydraulic trolley is provided with a box body structure, and a workstation oil tank is arranged in the box body structure;
the motor is arranged on the upper part of the box body structure and is connected with the gear pump through a coupler;
the S oil port is connected with an S oil port reversing valve, the S oil port reversing valve is connected with a gear pump through a pipeline, and the gear pump is connected with a workstation oil tank through a pipeline;
the T oil port is connected with a T oil port reversing valve through a pipeline;
the operation panel comprises a display, a controller and operation keys.
2. The multi-function mobile hydraulic workstation of claim 1, wherein:
the multifunctional mobile hydraulic workstation further comprises a one-way valve, a high-pressure filter, a main reversing valve, a normally open reversing valve, a particle detection sensor, an oil return filter and an air-cooled heat exchanger;
the gear pump is connected with an oil tank of a workstation through a pipeline, and the one-way valve, the high-pressure filter, the main reversing valve, the normally open reversing valve, the particle detection sensor, the oil return filter, the T oil port reversing valve and the air-cooling heat exchanger are sequentially connected in series.
3. The multi-function mobile hydraulic workstation of claim 2, wherein:
and the upper part of the box body structure is provided with a liquid level sensor and an air filter.
4. The multi-function mobile hydraulic workstation of claim 2, wherein:
the multifunctional mobile hydraulic workstation further comprises a flow sensor, and the flow sensor is connected in series with a pipeline between the T oil port and the T oil port reversing valve.
5. The multi-function mobile hydraulic workstation of claim 2, wherein:
the multifunctional mobile hydraulic workstation further comprises an oil port B, an oil port A1, an oil port A2, an oil port A3, a reversing valve of the oil port B, a reversing valve of the oil port A1, a reversing valve of the oil port A2 and a reversing valve of the oil port A3;
the oil port B is connected in series with the reversing valve of the oil port B to the main reversing valve through a pipeline;
the A1 oil port is connected in series with the reversing valve of the A1 oil port to the main reversing valve through a pipeline;
the A2 oil port is connected in series with the reversing valve of the A2 oil port to the main reversing valve through a pipeline;
the A3 oil port is connected in series with the reversing valve of the A3 oil port to the main reversing valve through a pipeline.
6. The multi-function mobile hydraulic workstation of claim 5, wherein:
the multifunctional mobile hydraulic workstation further comprises an air inlet and a pneumatic reversing valve;
the air inlet is connected in series with the pneumatic reversing valve to the main reversing valve through a pipeline.
7. The multi-function mobile hydraulic workstation of claim 5, wherein:
the multifunctional mobile hydraulic workstation further comprises a normally closed reversing valve;
the normally closed reversing valve is connected between the main reversing valve and the workstation oil tank in series.
8. The multi-function mobile hydraulic workstation of claim 2, wherein:
the multifunctional mobile hydraulic workstation further comprises a safety valve, and the safety valve is connected between the gear pump and the T oil port reversing valve in series.
9. The multi-function mobile hydraulic workstation of claim 2, wherein:
the multifunctional mobile hydraulic workstation further comprises a visual liquid level meter, and the visual liquid level meter is arranged on the workstation oil tank.
10. The multi-function mobile hydraulic workstation of claim 2, wherein:
the multifunctional mobile hydraulic workstation further comprises an oil drain ball valve, and the oil drain ball valve is arranged on an oil tank of the workstation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220202517.9U CN217002464U (en) | 2022-01-25 | 2022-01-25 | Multifunctional mobile hydraulic workstation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220202517.9U CN217002464U (en) | 2022-01-25 | 2022-01-25 | Multifunctional mobile hydraulic workstation |
Publications (1)
| Publication Number | Publication Date |
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| CN217002464U true CN217002464U (en) | 2022-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220202517.9U Active CN217002464U (en) | 2022-01-25 | 2022-01-25 | Multifunctional mobile hydraulic workstation |
Country Status (1)
| Country | Link |
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| CN (1) | CN217002464U (en) |
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2022
- 2022-01-25 CN CN202220202517.9U patent/CN217002464U/en active Active
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