CN210240193U - Hydraulic power station for mobile platform - Google Patents
Hydraulic power station for mobile platform Download PDFInfo
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- CN210240193U CN210240193U CN201920547342.3U CN201920547342U CN210240193U CN 210240193 U CN210240193 U CN 210240193U CN 201920547342 U CN201920547342 U CN 201920547342U CN 210240193 U CN210240193 U CN 210240193U
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Abstract
The utility model discloses a hydraulic power station for moving platform belongs to hydraulic pressure technical field. The hydraulic power station comprises a shell, an electric control module and a hydraulic module; the hydraulic module comprises an oil tank, a hydraulic pump, an unloading valve, a safety valve and a proportional overflow valve, wherein the input end of the hydraulic pump is communicated with the output end of the oil tank, the output end of the hydraulic pump is communicated with an oil port a of the unloading valve, an oil port b of the unloading valve is communicated with the input end of the oil tank, the oil port a of the safety valve is communicated with the oil port a of the unloading valve, the oil port b of the safety valve is communicated with the oil port b of the unloading valve, the oil port a of the proportional overflow valve is communicated with the oil port a of the safety valve, and the; the electric control module comprises a motor, a driver, a controller and a direct current transformer, wherein the driver is electrically connected with the motor, the direct current transformer is electrically connected with the driver and the controller, and the controller is respectively electrically connected with the driver, the unloading valve and the proportional overflow valve. The utility model discloses hydraulic power station's overflow loss has been reduced.
Description
Technical Field
The utility model belongs to the technical field of hydraulic pressure, in particular to hydraulic power station for moving platform.
Background
A hydraulic power station is a common power source used to provide hydraulic energy to hydraulic equipment. The common hydraulic power station mainly comprises an oil tank, a motor, a hydraulic pump and an electric control module, wherein the electric control module controls the motor to work, so that the motor drives the hydraulic pump to pump out hydraulic oil in the oil tank, and hydraulic energy is provided for hydraulic equipment.
In the process of implementing the present invention, the inventor finds that the prior art has at least the following problems:
the mobile platform is a movable hydraulic device, and needs to carry other executing devices, so that the volume of the hydraulic power station is required to be small. The existing hydraulic power station is simple in structure, the output flow of the hydraulic power station cannot be adjusted according to user requirements, so that the overflow loss is high, the heating is serious, and the integration of the hydraulic power station is not facilitated.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a hydraulic power station for moving platform can reduce hydraulic power station's overflow loss. The technical scheme is as follows:
the embodiment of the utility model provides a hydraulic power station for moving platform, including casing, electronic control module and hydraulic module all install in the casing;
the hydraulic module comprises an oil tank, a hydraulic pump, an unloading valve, a safety valve and a proportional overflow valve, wherein the input end of the hydraulic pump is communicated with the output end of the oil tank, the output end of the hydraulic pump is communicated with an oil a port of the unloading valve, an oil b port of the unloading valve is communicated with the input end of the oil tank, an oil a port of the safety valve is communicated with the oil a port of the unloading valve, an oil b port of the safety valve is communicated with the oil b port of the unloading valve, a control oil port of the safety valve is communicated with the oil a port of the safety valve, an oil a port of the proportional overflow valve is communicated with the oil a port of the safety valve, an oil b port of the proportional overflow valve is communicated with the oil b port of the safety valve, and a;
the electric control module comprises a motor, a driver, a controller and a direct current transformer, the motor is in transmission connection with the hydraulic pump, the driver is electrically connected with the motor, the direct current transformer is respectively electrically connected with the driver and the controller, and the controller is respectively electrically connected with the driver, the unloading valve and the proportional overflow valve.
The utility model discloses an among the implementation, automatically controlled module still includes the terminal box, the terminal box the driver the controller with DC transformer all fixes on the side of casing, the driver the controller with DC transformer passes through terminal box electric connection is in the same place.
The utility model discloses an in another kind of implementation, electronic control module still includes motor temperature sensor, motor temperature sensor sets up in the motor, motor temperature sensor with the controller electricity is connected.
The utility model discloses an in another implementation, automatically controlled module still includes floater level gauge and fluid temperature sensor, the floater level gauge with fluid temperature sensor all with the controller electricity is connected, the floater level gauge with fluid temperature sensor all fixes the top surface of oil tank, the bottom surface of oil tank with the bottom surface of casing is together fixed.
The utility model discloses an in another implementation, hydraulic module still includes air-cooled ware and high pressure filter, the air-cooled ware intercommunication is in the input of oil tank with on the oil circuit between the b hydraulic fluid port of off-load valve, the bottom surface of air-cooled ware with the bottom surface of casing is together fixed, high pressure filter intercommunication is in the output of hydraulic pump with on the oil circuit between the a hydraulic fluid port of off-load valve, high pressure filter fixes the top surface of air-cooled ware.
In yet another implementation of the present invention, the hydraulic module further includes an ambient temperature switch and a fan, the ambient temperature switch is fixed to the top surface of the air cooler, the fan is disposed between the side of the oil tank and the side of the casing, the side of the casing corresponds to the position of the fan is provided with a heat dissipation hole, and the fan passes through the ambient temperature switch and the dc transformer are electrically connected.
In yet another implementation of the present invention, the hydraulic module further includes a check valve, an input of the check valve communicates with the hydraulic pump, an output of the check valve communicates with the air cooler.
In yet another implementation of the present invention, the electronic control module further includes a pressure sensor, the pressure sensor is connected to the output end of the hydraulic pump, and the pressure sensor is electrically connected to the controller.
In another implementation of the present invention, the check valve, the pressure sensor and the safety valve are integrated on a central valve block, and the central valve block is fixed on the motor.
In another implementation of the present invention, the unloading valve and the proportional overflow valve are integrated on a control valve block, and the control valve block is fixed on the central valve block.
The embodiment of the utility model provides a beneficial effect that technical scheme brought is:
through the embodiment of the utility model provides a when hydraulic power station provides hydraulic energy for moving platform, direct current transformer conversion external power supply for driver and controller power supply. The controller drives the motor to work through the driver, and the motor drives the hydraulic pump to pump out the hydraulic oil in the oil tank, so that the hydraulic energy output of the hydraulic power station is realized. When the hydraulic power station works, the driver can be controlled through the controller according to actual demands to adjust the rotating speed of the motor, so that the output flow of the hydraulic power station is controlled, the overflow loss is reduced, the heat generation of the hydraulic power station is reduced, the integration of the hydraulic power station is facilitated, and the size of the hydraulic power station can be reduced. In addition, the system pressure of the hydraulic power station can be adjusted through the proportional overflow valve. And when the output of the hydraulic power station needs to be cut off urgently, the unloading valve can be controlled to be opened through the controller, so that the hydraulic oil pumped out of the hydraulic pump is discharged into the oil return tank through the unloading valve, an active safety effect is achieved, and the reliability of the hydraulic power station is improved. In addition, the hydraulic power station also comprises a safety valve, and when the output pressure of the hydraulic pump is higher than the threshold value set by the safety valve, the safety valve can discharge the hydraulic oil back to the oil tank, so that a passive safety function is achieved, and the reliability of the hydraulic power station is further improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a hydraulic diagram of a hydraulic power station provided by an embodiment of the present invention;
fig. 2 is an external structural schematic diagram of a hydraulic power station according to an embodiment of the present invention;
fig. 3 is a schematic diagram of one side internal structure of the hydraulic power station provided by the embodiment of the present invention;
fig. 4 is a schematic view of the internal structure of the other side of the hydraulic power station provided by the embodiment of the present invention;
the symbols in the drawings represent the following meanings:
1. a housing; 11. a top surface; 12. a bottom surface; 13. a long side; 14. a short side; 15. a power interface; 16. a communication interface; 21. an oil tank; 22. a hydraulic pump; 23. an unloading valve; 24. a safety valve; 25. a proportional relief valve; 26. an air cooler; 27. a high pressure filter; 28. an ambient temperature switch; 29. a fan; 210. a one-way valve; 31. a motor; 32. a driver; 33. a controller; 34. a DC transformer; 35. a junction box; 36. a floating ball liquid level meter; 37. an oil temperature sensor; 38. a motor temperature sensor; 39. a pressure sensor; 4. a central valve block; 5. and a control valve block.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the utility model provides a hydraulic power station for moving platform, hydraulic power station include casing 1, electronic control module and hydraulic module, and electronic control module and hydraulic module are all installed in casing 1.
Fig. 1 is a hydraulic diagram of a hydraulic power station, and referring to fig. 1, a hydraulic module includes an oil tank 21, a hydraulic pump 22, an unloading valve 23, a safety valve 24, and a proportional overflow valve 25, an input end of the hydraulic pump 22 is communicated with an output end of the oil tank 21, an output end of the hydraulic pump 22 is communicated with an oil a port of the unloading valve 23, an oil b port of the unloading valve 23 is communicated with an input end of the oil tank 21, an oil a port of the safety valve 24 is communicated with the oil a port of the unloading valve 23, an oil b port of the safety valve 24 is communicated with the oil b port of the unloading valve 23, a control port of the safety valve 24 is communicated with the oil a port of the safety valve 24, an oil a port of the proportional overflow valve 25 is communicated with the oil a port of the safety valve 24, an oil b port of.
The electric control module comprises a motor 31, a driver 32, a controller 33 and a direct current transformer 34, wherein the motor 31 is in transmission connection with the hydraulic pump 22, the driver 32 is electrically connected with the motor 31, the direct current transformer 34 is respectively electrically connected with the driver 32 and the controller 33, and the controller 33 is respectively electrically connected with the driver 32, the unloading valve 23 and the proportional relief valve 25.
Through the embodiment of the utility model provides a when hydraulic power station provides hydraulic energy for moving platform, direct current transformer 34 conversion external power supply for driver 32 and controller 33 power supply. The controller 33 drives the motor 31 to work through the driver 32, and the motor 31 drives the hydraulic pump 22 to pump out the hydraulic oil in the oil tank 21, so that the hydraulic energy output of the hydraulic power station is realized. When the hydraulic power station works, the driver 32 can be controlled through the controller 33 according to actual requirements, the rotating speed of the motor 31 is adjusted, the output flow of the hydraulic power station is controlled, the overflow loss is reduced, the heat generation of the hydraulic power station is reduced, the integration of the hydraulic power station is facilitated, and the size of the hydraulic power station can be reduced. In addition, by arranging the proportional overflow valve 25, an operator can adjust the oil supply pressure of the hydraulic power station in real time according to the actual output requirement, so that the throttling pressure drop loss of the hydraulic power station can be reduced, the heating is reduced, and the service efficiency of a power supply is improved. In addition, when the output of the hydraulic power station needs to be cut off urgently, the unloading valve 23 can be controlled to be opened through the controller 33, so that the hydraulic oil pumped out from the hydraulic pump 22 is drained back to the oil tank 21 through the unloading valve 23, an active safety effect is achieved, and the reliability of the hydraulic power station is improved. In addition, the hydraulic power station further comprises a safety valve 24, when the output pressure of the hydraulic pump 22 is higher than the threshold value set by the safety valve 24, the safety valve 24 can drain the hydraulic oil back to the oil tank 21, so that a passive safety function is achieved, and the reliability of the hydraulic power station is further improved.
In this embodiment, the motor 31 may be a servo motor, a brushless motor, or the like, and the present invention is not limited thereto.
Fig. 2 is a schematic external structural diagram of a hydraulic power station, and in conjunction with fig. 2, in this embodiment, the casing 1 may be a rectangular parallelepiped structural member, which includes a top surface 11, a bottom surface 12, two opposite long side surfaces 13 and two opposite short side surfaces 14, the top surface 11 and the bottom surface 12 are arranged in parallel, and the two long side surfaces 13 and the two short side surfaces 14 are sequentially enclosed together to form a rectangular parallelepiped.
Illustratively, a power interface 15, a communication interface 16, a high-voltage interface P and a low-voltage interface T are arranged on one short side 14, and the power interface 15 is electrically connected with a direct current transformer 34 for connecting an external power supply. The communication interface 16 is used for connecting an external operating system through a CAN bus to receive a control instruction. The high-pressure interface P and the low-pressure interface T are respectively used for connecting a high-pressure interface and a low-pressure interface of external hydraulic equipment so as to realize communication between the external hydraulic equipment and the hydraulic power station.
Fig. 3 is a schematic diagram of an internal structure of one side of the hydraulic power station, and referring to fig. 3, in this embodiment, the electronic control module further includes a junction box 35, the driver 32, the controller 33, and the dc transformer 34 are all fixed on a side surface of the housing 1, and the driver 32, the controller 33, and the dc transformer 34 are electrically connected together through the junction box 35.
In the implementation mode, the driver 32, the controller 33 and the direct current transformer 34 are electrically connected together through the junction box 35, so that wiring in the hydraulic power station can be facilitated, the integration degree of the hydraulic power station can be effectively improved, and the reduction of the size of the hydraulic power station is facilitated.
Illustratively, the controller 33 and the dc transformer 34 are disposed on one long side 13 of the housing 1, and the driver 32 and the junction box are disposed on the other long side 13 of the housing 1, so that the space in the housing 1 can be effectively utilized to reduce the size of the hydraulic power station.
In this embodiment, the electronic control module further includes a float level meter 36 and an oil temperature sensor 37, the float level meter 36 and the oil temperature sensor 37 are both electrically connected to the controller 33, the float level meter 36 and the oil temperature sensor 37 are both fixed to the top surface of the oil tank 21, and the bottom surface of the oil tank 21 is fixed to the bottom surface of the housing 1.
In the above implementation, the float level meter 36 is used to monitor the level of the hydraulic oil in the oil tank 21, and when the level of the hydraulic oil is too low or too high, the controller 33 will issue an alarm to remind the operator to remove the fault. The oil temperature sensor 37 is used to monitor the temperature of the hydraulic oil in the oil tank 21, and when the temperature of the hydraulic oil is too high, the controller 33 will send out an alarm to remind the operator to remove the fault.
For example, by providing a buzzer, when an alarm needs to be issued, the controller 33 controls the buzzer to sound the alarm, so as to remind the operator.
Fig. 4 is a schematic diagram of the internal structure of the other side of the hydraulic power station, and in fig. 4, in order to better show the internal structure of the hydraulic power station, a part of the oil tank 21 is hidden, so that the float level gauge 36 and the oil temperature sensor 37 are suspended.
With reference to fig. 4, in this embodiment, the electronic control module further includes a motor temperature sensor 38, the motor temperature sensor 38 is disposed on the motor 31, and the motor temperature sensor 38 is electrically connected to the controller 33.
In the above implementation, the motor temperature sensor 38 is used to monitor the temperature of the motor 31, and when the temperature of the motor 31 is too high, the controller 33 sends an alarm to remind the operator to remove the fault.
For example, when the temperature of the motor 31 is too high, an alarm may be issued by the buzzer.
When it needs to be explained, in order to distinguish different faults, the alarm sounds under different faults can be set differently. For example, when the liquid level of the hydraulic oil is too low or too high, the buzzer sounds once, and then sounds once after 2 seconds, and so on. When the temperature of the hydraulic oil is too high, the buzzer continuously makes two sounds (the interval between the two sounds is 0.5 second), and after the two sounds, the buzzer makes two sounds after the interval is 2 seconds, and so on. When the temperature of the motor 31 is too high, the buzzer continuously makes three sounds (the interval between the three sounds is 0.5 second), and after the three sounds, the buzzer makes three sounds after 2 seconds, and so on. Therefore, different faults can be reported through one buzzer, the internal structure of the hydraulic power station is further simplified, and the size of the hydraulic power station is reduced.
It should be noted that, because the CAN bus is disposed on the communication interface 16, when the hydraulic power station has the above-mentioned fault, an operator may connect to the fault diagnosis device through the CAN bus, and the controller sends a fault code to the control diagnosis device, so that the operator CAN know what kind of fault has occurred in the hydraulic power station.
In this embodiment, the hydraulic module further includes an air cooler 26 and a high pressure filter 27, the air cooler 26 is communicated with an oil path between the input end of the oil tank 21 and the oil port b of the unloading valve 23, the bottom surface of the air cooler 26 is fixed with the bottom surface of the housing 1, the high pressure filter 27 is communicated with an oil path between the output end of the hydraulic pump 22 and the oil port a of the unloading valve 23, and the high pressure filter 27 is fixed on the top surface of the air cooler 26.
In the above implementation, the air cooler 26 is used to cool the hydraulic oil returned to the oil tank 21, and the high-pressure filter 27 is used to filter the hydraulic oil pumped out by the hydraulic pump 22. The high pressure filter 27 is fixed on the top surface of the air cooler 26, so that the height of the shell 1 can be effectively utilized, and the miniaturization of the hydraulic power station is facilitated.
Referring to fig. 3 again, in the present embodiment, the hydraulic module further includes an ambient temperature switch 28 and a fan 29, the ambient temperature switch 28 is fixed on the top surface of the air cooler 26, the fan 29 is disposed between the side surface of the oil tank 21 and the side surface of the housing 1, the side surface of the housing 1 is provided with a heat dissipation hole corresponding to the position of the fan 29, and the fan 29 is electrically connected to the dc transformer 34 through the ambient temperature switch 28.
In the above implementation, the ambient temperature switch 28 can be automatically turned on and off according to the ambient temperature. When the ambient temperature is higher than a certain threshold value, the ambient temperature switch 28 is automatically turned on, so that the fan 29 is communicated with the direct current transformer 34, and the fan 29 is powered to work so as to cool the environment in the housing 1. When the ambient temperature is lower than the threshold value, the ambient temperature switch 28 is automatically turned off, so that the fan 29 and the direct current transformer 34 are disconnected, and the fan 29 is turned off, thereby saving energy and reducing noise.
Illustratively, the fan 29 is disposed between the oil tank 21 and the long side of the case 1, and the dc transformer 34 is disposed above the fan 29, so that the oil tank 21 and the dc transformer 34 can be effectively cooled. The oil tank 21 and the direct current transformer 34 are main heating points of the hydraulic power station, and the internal environment temperature of the housing 1 can be effectively reduced by radiating the oil tank and the direct current transformer.
Optionally, the louvre can be honeycomb holes, rectangular holes etc to guarantee the radiating effect promptly, guaranteed the structural strength of 1 long side of casing again.
Referring again to fig. 4, in this embodiment, the hydraulic module further includes a check valve 210, an input of the check valve 210 is in communication with the hydraulic pump 22, and an output of the check valve 210 is in communication with the air cooler 26.
In the above implementation, the check valve 210 is used to prevent the hydraulic oil pumped by the hydraulic pump 22 from flowing back, which improves the reliability of the hydraulic power station.
In this embodiment, the electronic control module further includes a pressure sensor 39, the pressure sensor 39 is in communication with the output of the hydraulic pump 22, and the pressure sensor 39 is electrically connected to the controller 33.
In the above implementation, the pressure sensor 39 is configured to monitor the output pressure of the hydraulic pump 22 and feed back the pressure value to the controller 33, and the controller 33 may compare the detected pressure value with a set pressure value, so as to adjust the opening degree of the proportional relief valve 25, thereby implementing the internal feedback adjustment.
In the present embodiment, the check valve 210, the pressure sensor 39, and the relief valve 24 are all integrated on the center valve block 4, and the center valve block 4 is fixed to the motor 31.
In the above implementation, the check valve 210, the pressure sensor 39 and the relief valve 24 are integrated into one valve block, further improving the integration of the hydraulic power station.
In the present embodiment, the unloading valve 23 and the proportional relief valve 25 are integrated on the control valve block 5, and the control valve block 5 is fixed on the motor 31.
In the above implementation, the unloading valve 23 and the proportional relief valve 25 are integrated into a single valve block, which further improves the integration of the hydraulic power station.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A hydraulic power station for a mobile platform, characterized in that the hydraulic power station comprises a housing, an electronic control module and a hydraulic module, wherein the electronic control module and the hydraulic module are both mounted in the housing;
the hydraulic module comprises an oil tank, a hydraulic pump, an unloading valve, a safety valve and a proportional overflow valve, wherein the input end of the hydraulic pump is communicated with the output end of the oil tank, the output end of the hydraulic pump is communicated with an oil a port of the unloading valve, an oil b port of the unloading valve is communicated with the input end of the oil tank, an oil a port of the safety valve is communicated with the oil a port of the unloading valve, an oil b port of the safety valve is communicated with the oil b port of the unloading valve, a control oil port of the safety valve is communicated with the oil a port of the safety valve, an oil a port of the proportional overflow valve is communicated with the oil a port of the safety valve, an oil b port of the proportional overflow valve is communicated with the oil b port of the safety valve, and a;
the electric control module comprises a motor, a driver, a controller and a direct current transformer, the motor is in transmission connection with the hydraulic pump, the driver is electrically connected with the motor, the direct current transformer is respectively electrically connected with the driver and the controller, and the controller is respectively electrically connected with the driver, the unloading valve and the proportional overflow valve.
2. The hydraulic power station of claim 1, wherein the electronic control module further comprises a junction box, the driver, the controller, and the dc transformer being secured to a side of the housing, the driver, the controller, and the dc transformer being electrically connected together by the junction box.
3. The hydraulic power station of claim 1, wherein the electronic control module further comprises a motor temperature sensor disposed within the motor, the motor temperature sensor being electrically connected to the controller.
4. The hydraulic power station of claim 1, wherein the electronic control module further comprises a float level gauge and an oil temperature sensor, the float level gauge and the oil temperature sensor are electrically connected to the controller, the float level gauge and the oil temperature sensor are fixed to a top surface of the oil tank, and a bottom surface of the oil tank is fixed to a bottom surface of the housing.
5. The hydraulic power station as claimed in claim 1, wherein the hydraulic module further comprises an air cooler and a high pressure filter, the air cooler is communicated with an oil path between the input end of the oil tank and the oil port b of the unloading valve, the bottom surface of the air cooler is fixed with the bottom surface of the housing, the high pressure filter is communicated with an oil path between the output end of the hydraulic pump and the oil port a of the unloading valve, and the high pressure filter is fixed on the top surface of the air cooler.
6. The hydraulic power station as claimed in claim 5, wherein the hydraulic module further comprises an ambient temperature switch and a fan, the ambient temperature switch is fixed on the top surface of the air cooler, the fan is arranged between the side surface of the oil tank and the side surface of the housing, the side surface of the housing is provided with heat dissipation holes corresponding to the position of the fan, and the fan is electrically connected with the DC transformer through the ambient temperature switch.
7. The hydraulic power station of claim 5, wherein the hydraulic module further comprises a one-way valve, an input of the one-way valve being in communication with the hydraulic pump and an output of the one-way valve being in communication with the air cooler.
8. The hydraulic power station of claim 7, wherein the electronic control module further comprises a pressure sensor in communication with an output of the hydraulic pump, the pressure sensor being electrically connected to the controller.
9. The hydraulic power station of claim 8, wherein the check valve, the pressure sensor, and the relief valve are integrated into a center valve block that is secured to the motor.
10. The hydraulic power station of claim 9, wherein the unloading valve and the proportional relief valve are integrated on a control valve block that is fixed to the central valve block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920547342.3U CN210240193U (en) | 2019-04-19 | 2019-04-19 | Hydraulic power station for mobile platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920547342.3U CN210240193U (en) | 2019-04-19 | 2019-04-19 | Hydraulic power station for mobile platform |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210240193U true CN210240193U (en) | 2020-04-03 |
Family
ID=69967449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920547342.3U Expired - Fee Related CN210240193U (en) | 2019-04-19 | 2019-04-19 | Hydraulic power station for mobile platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210240193U (en) |
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2019
- 2019-04-19 CN CN201920547342.3U patent/CN210240193U/en not_active Expired - Fee Related
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