CN216691651U - Hydraulic system for amplitude-variable control of suspension arm - Google Patents
Hydraulic system for amplitude-variable control of suspension arm Download PDFInfo
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- CN216691651U CN216691651U CN202122731264.2U CN202122731264U CN216691651U CN 216691651 U CN216691651 U CN 216691651U CN 202122731264 U CN202122731264 U CN 202122731264U CN 216691651 U CN216691651 U CN 216691651U
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Abstract
The utility model provides a hydraulic system for amplitude variation control of a suspension arm, which comprises a first amplitude rising oil way, a first amplitude descending oil way, a second amplitude rising oil way and a second amplitude descending oil way, wherein the first amplitude rising oil way is connected with the first amplitude descending oil way; the first amplitude-variable communicating oil way is connected with the first amplitude-variable ascending oil way and the first amplitude-variable descending oil way; the second variable-amplitude communicating oil way is connected with the second variable-amplitude ascending oil way and the second variable-amplitude descending oil way; the flow of the hydraulic oil in the first variable-amplitude ascending oil way is consistent with that of the hydraulic oil in the second variable-amplitude ascending oil way; the flow of the hydraulic oil in the first amplitude-variable descending oil way is consistent with that of the hydraulic oil in the second amplitude-variable descending oil way; the flow of hydraulic oil is consistent through the first variable amplitude balance valve and the second balance valve; so that the first variable amplitude hydraulic motor and the second variable amplitude hydraulic motor can synchronously rotate; so that the amplitude-variable winch can stably act; while reducing the risk of pressure imbalances in the hydraulic system.
Description
Technical Field
The utility model relates to the field of cranes, in particular to a hydraulic system for amplitude variation control of a suspension arm.
Background
The marine crane is a special crane for carrying out transportation operation in the marine environment, and is mainly used for important tasks of transportation and transfer of goods among ships, marine supply, throwing and recovering of underwater operation equipment and the like. The amplitude variation system provides power and brake for the amplitude variation winch platform. When the oil pressure is suddenly increased and the pressure of a hydraulic system of the crane is unbalanced, hydraulic elements can be out of work or damaged, oil leakage of an oil pipe can be caused, and even the oil pipe is cracked, so that the safety of operation can be seriously threatened.
To solve the above technical problems; in chinese application No. 201811289896.4; the patent document with publication number 2020.5.8 discloses a crane hydraulic system and a working method; it discloses a luffing system; the amplitude varying system is connected with one end of a first amplitude varying hydraulic motor through an amplitude varying ascending oil supply pipeline; the other variable-amplitude ascending oil supply pipeline is connected with one end of a second variable-amplitude hydraulic motor; is connected with the other end of the first variable-amplitude hydraulic motor through a variable-amplitude descending oil supply pipeline; the other amplitude-variable descending oil supply pipeline is connected with one end of a second amplitude-variable hydraulic motor; but the two amplitude-variable ascending oil supply pipelines and the two amplitude-variable descending oil supply pipelines are not communicated; when the flow of hydraulic oil entering a pipeline is large; when the flow of the hydraulic oil entering the other pipeline is small, the pressure born by the two pipelines is inconsistent; meanwhile, the two pipelines have the condition of inconsistent hydraulic oil flow; the flow of hydraulic oil passing through the first luffing balance valve and the second luffing balance valve respectively is inconsistent; the flow of hydraulic oil entering the first variable amplitude hydraulic motor and the flow of hydraulic oil entering the second variable amplitude hydraulic motor cannot be kept consistent; so that the first variable amplitude hydraulic motor and the second variable amplitude hydraulic motor can not synchronously rotate; hydraulic system pressure imbalance is easily created.
Disclosure of Invention
The utility model provides a hydraulic system and a control method for amplitude variation control of a suspension arm, wherein the flow of hydraulic oil entering a first amplitude variation hydraulic motor and the flow of hydraulic oil entering a second amplitude variation hydraulic motor are kept consistent.
In order to achieve the purpose, the technical scheme of the utility model is as follows: a hydraulic system for amplitude variation control of a suspension arm; the hydraulic control system comprises a first variable amplitude hydraulic motor, a second variable amplitude hydraulic motor, a first variable amplitude balance valve, a second variable amplitude balance valve, a variable amplitude winch, a variable amplitude brake mechanism, a first variable amplitude reversing valve and a variable amplitude shuttle valve; one end of the first variable amplitude hydraulic motor is connected with a first variable amplitude ascending oil way; the first variable-amplitude ascending oil way is connected with a control oil port BA 1; the other end of the first variable amplitude hydraulic motor is connected with a first variable amplitude descending oil way; the first amplitude-variable descending oil way is connected with a control oil port BB 1; the first amplitude-variable ascending oil way is connected with a first amplitude-variable balance valve; one end of the second variable-amplitude hydraulic motor is connected with a second variable-amplitude ascending oil way; the second variable-amplitude ascending oil way is connected with a control oil port BA 2; the other end of the second variable-amplitude hydraulic motor is connected with a second variable-amplitude descending oil way; the second amplitude-variable descending oil way is connected with a control oil port BB 2; a second variable-amplitude ascending oil path is connected with a second variable-amplitude balance valve; a first variable-amplitude oil-communicating passage is connected between the first variable-amplitude oil-rising passage and the second variable-amplitude oil-rising passage; the flow of the hydraulic oil in the first variable-amplitude ascending oil way is consistent with that of the hydraulic oil in the second variable-amplitude ascending oil way; a second variable-amplitude descending oil way is connected between the first variable-amplitude descending oil way and the second variable-amplitude descending oil way; the flow of the hydraulic oil in the first amplitude-variable descending oil way is consistent with that of the hydraulic oil in the second amplitude-variable descending oil way.
The first variable amplitude communicating oil way is arranged; hydraulic oil in the first amplitude-variable ascending oil way flows into the second amplitude-variable ascending oil way; hydraulic oil in the second amplitude ascending oil way flows into the first amplitude ascending oil way; the flow of the hydraulic oil in the first variable-amplitude ascending oil way is consistent with that of the hydraulic oil in the second variable-amplitude ascending oil way; a second amplitude-variable communicating oil way is arranged; hydraulic oil in the first amplitude-variable descending oil way flows into the second amplitude-variable descending oil way; hydraulic oil in the second amplitude-variable descending oil way flows into the first amplitude-variable descending oil way; the flow of the hydraulic oil in the first amplitude-variable descending oil way is consistent with that of the hydraulic oil in the second amplitude-variable descending oil way; thus, the pressure born by the first amplitude ascending oil circuit and the second amplitude ascending oil circuit is consistent; the pressure born by the first amplitude-variable descending oil circuit and the second amplitude-variable descending oil circuit is consistent; meanwhile, the flow rates of hydraulic oil between the two amplitude ascending oil ways and between the two amplitude ascending oil ways are consistent; the flow of hydraulic oil is consistent through the first variable amplitude balance valve and the second balance valve; the flow rates of the hydraulic oil respectively entering the first variable amplitude hydraulic motor and the second variable amplitude hydraulic motor are the same; the first variable amplitude hydraulic motor and the second variable amplitude hydraulic motor can synchronously rotate; so that the amplitude-variable winch can stably act; while reducing the risk of pressure imbalance in the hydraulic system.
Furthermore, the amplitude-variable brake mechanism comprises a first amplitude-variable hydraulic brake and a second amplitude-variable hydraulic brake; the first amplitude-variable hydraulic brake clamps the power output end of the first amplitude-variable hydraulic motor; the second variable amplitude hydraulic brake clamps the power output end of the second variable amplitude hydraulic motor; the first amplitude-variable hydraulic brake and the second amplitude-variable hydraulic brake are both connected with one end of the first amplitude-variable reversing valve; the other end of the first variable amplitude reversing valve is connected with an emergency oil way; the emergency oil way is connected with a control oil port BR; the signal end of the first amplitude-changing reversing valve is connected with the output end of the amplitude-changing shuttle valve; one input end of the amplitude-variable shuttle valve is connected with the first amplitude-variable ascending oil path; the other input end of the amplitude-variable shuttle valve is connected with the first amplitude-variable descending oil way.
The above setting is carried out; when the amplitude-variable winch carries out lifting action; hydraulic oil is input from the first amplitude-variable ascending oil path and is input into a signal end of the first amplitude-variable reversing valve; reversing the first variable amplitude reversing valve; hydraulic oil entering from the emergency oil way flows into a variable amplitude hydraulic brake and a second variable amplitude hydraulic brake to open the brake; the first variable amplitude hydraulic motor and the second variable amplitude hydraulic motor synchronously rotate; when the amplitude-variable winch descends; hydraulic oil is input into a signal end of the first amplitude-variable reversing valve from the first amplitude-variable descending oil way; reversing the first variable amplitude reversing valve; hydraulic oil entering from the emergency oil way flows into a variable amplitude hydraulic brake and a second variable amplitude hydraulic brake to open the brake; the first amplitude-variable hydraulic motor and the second amplitude-variable hydraulic motor rotate synchronously.
Furthermore, the device also comprises an amplitude-variable upper limiting reversing valve and an amplitude-variable lower limiting reversing valve; the amplitude variation upper limiting reversing valve is connected between the amplitude variation shuttle valve and the first amplitude variation ascending oil way; the amplitude-variable lower limiting reversing valve is connected between the amplitude-variable shuttle valve and the first amplitude-variable descending oil way. Therefore, the lifting and the descending of the amplitude-variable winch can be respectively limited.
Furthermore, an oil drain port of the first variable amplitude hydraulic motor, an oil drain port of the second variable amplitude hydraulic motor, one end of the first variable amplitude reversing valve, one end of the variable amplitude upper limiting reversing valve and one end of the variable amplitude lower limiting reversing valve are connected with an oil return line; the oil return oil way is connected with a control oil port BL.
Further, the first amplitude-variable balance valve comprises a first amplitude-variable one-way valve and a first amplitude-variable overflow valve; an oil inlet of the first variable amplitude overflow valve is connected with one end of the first variable amplitude hydraulic motor; an oil outlet of the first variable amplitude overflow valve is connected with a control oil port BA 1; a control oil port of the first variable-amplitude overflow valve is connected with the second variable-amplitude descending oil way; an oil inlet of the first variable amplitude one-way valve is connected with an oil outlet of the first variable amplitude overflow valve; an oil outlet of the first variable amplitude one-way valve is connected with an oil inlet of the first variable amplitude overflow valve.
Further, the second amplitude-variable balance valve comprises a second amplitude-variable one-way valve and a second amplitude-variable overflow valve; an oil inlet of the second variable amplitude overflow valve is connected with one end of the second variable amplitude hydraulic motor; an oil outlet of the second variable-amplitude overflow valve is connected with a control oil port BA 2; a control oil port of the second variable-amplitude overflow valve is connected with the second variable-amplitude descending oil way; an oil inlet of the second variable amplitude one-way valve is connected with an oil outlet of the second variable amplitude overflow valve; an oil outlet of the second variable amplitude one-way valve is connected with an oil inlet of the second variable amplitude overflow valve.
Drawings
FIG. 1 is a hydraulic schematic of the hydraulic system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1; a hydraulic system for amplitude variation control of a suspension arm; the hydraulic control system comprises a first amplitude-variable hydraulic motor 21, a second amplitude-variable hydraulic motor 22, a first amplitude-variable balance valve 23, a second amplitude-variable balance valve 24, an amplitude-variable winch 25, an amplitude-variable brake mechanism, a first amplitude-variable reversing valve 26, an amplitude-variable shuttle valve 27, an amplitude-variable upper limiting reversing valve 28 and an amplitude-variable lower limiting reversing valve 29.
One end of the first variable amplitude hydraulic motor 21 is connected with a first variable amplitude ascending oil path 201; the first variable-amplitude ascending oil path 201 is connected with a control oil port BA 1; the other end of the first luffing hydraulic motor 21 is connected with a first luffing descent oil path 202; the first luffing descent oil passage 202 is connected with a control oil port BB 1. The oil drain port of the first variable amplitude hydraulic motor 21 and the oil drain port of the second variable amplitude hydraulic motor 22 are connected with an oil return path 207; the oil return passage 207 is connected to a control port BL.
The first variable-amplitude ascending oil path 201 is connected with a first variable-amplitude balance valve 23; one end of the second luffing hydraulic motor 22 is connected with a second luffing oil lifting oil path 203; the second variable-amplitude ascending oil way 203 is connected with a control oil port BA 2; the other end of the second variable-amplitude hydraulic motor 22 is connected with a second variable-amplitude descending oil path 204; the second amplitude descending oil way 204 is connected with a control oil port BB 2; the second variable-amplitude ascending oil way 203 is connected with a second variable-amplitude balance valve 24; a first amplitude-variable communication oil way 205 is connected between the first amplitude-variable ascending oil way 201 and the second amplitude-variable ascending oil way 203; the flow rate of the hydraulic oil in the first variable-amplitude ascending oil path 201 is consistent with that of the hydraulic oil in the second variable-amplitude ascending oil path 203; a second amplitude-variable descending oil passage 206 is connected between the first amplitude-variable descending oil passage 202 and the second amplitude-variable descending oil passage 204; the flow rate of the hydraulic oil in the first amplitude descending oil path 202 is consistent with that of the hydraulic oil in the second amplitude descending oil path 204.
The power output end of the first amplitude-variable hydraulic motor 21 and the power output end of the second amplitude-variable hydraulic motor 22 are respectively connected with an amplitude-variable winch 25, and the amplitude-variable brake mechanism comprises a first amplitude-variable hydraulic brake 31 and a second amplitude-variable hydraulic brake 32; the first luffing hydraulic brake 31 clamps the power output end of the first luffing hydraulic motor 21; the second luffing hydraulic brake 32 clamps the power output of the second luffing hydraulic motor 22; the first luffing hydraulic brake 31 and the second luffing hydraulic brake 32 are both connected to the B5 end of the first luffing reversing valve 26; the A5 end of the first variable amplitude reversing valve 26 is connected with the emergency oil way 208; the P5 end of the first variable amplitude reversing valve 26 is connected with the oil return path 207; the emergency oil way 208 is connected with a control oil port BR; the signal end of the first luffing shuttle valve 26 is connected to the output end of the luffing shuttle valve 27.
One input end of the luffing shuttle valve 27 is connected with the B3 end of the luffing upper limiting reversing valve 28; the P3 end of the luffing upper limiting directional valve 28 is connected to the first luffing oil rising passage 201. The other input end of the luffing shuttle valve 27 is connected with the end B4 of the luffing lower limiting reversing valve 29; the P4 end of the amplitude lower limiting directional control valve 29 is connected to the first amplitude lowering oil passage 202. Thus, the lifting and the descending of the amplitude-variable winch 25 can be respectively limited. The end T3 of the amplitude upper limit reversing valve 28 and the end T4 of the amplitude lower limit reversing valve 29 are connected with the oil return passage 207. The end A3 of the upper amplitude limiting directional valve 28 and the end a4 of the lower amplitude limiting directional valve 29 are stopped. In the present embodiment, the amplitude upper limit reversing valve 28 and the amplitude lower limit reversing valve 29 are both two-position four-way mechanical reversing valves.
The first amplitude balance valve 23 comprises a first amplitude one-way valve 231 and a first amplitude overflow valve 232; an oil inlet of the first variable amplitude overflow valve 232 is connected with one end of the first variable amplitude hydraulic motor 21; an oil outlet of the first variable amplitude overflow valve 232 is connected with a control oil port BA 1; a control oil port of the first amplitude-variable overflow valve 232 is connected with the second amplitude-variable descending oil way 204; an oil inlet of the first variable amplitude one-way valve 231 is connected with an oil outlet of the first variable amplitude overflow valve 232; an oil outlet of the first variable amplitude one-way valve 231 is connected with an oil inlet of the first variable amplitude overflow valve 232.
The second amplitude balance valve 24 comprises a second amplitude one-way valve 241 and a second amplitude overflow valve 242; an oil inlet of the second variable amplitude overflow valve 242 is connected with one end of the second variable amplitude hydraulic motor 22; an oil outlet of the second variable amplitude overflow valve 242 is connected with a control oil port BA 2; a control oil port of the second amplitude-variable overflow valve 242 is connected with the second amplitude-variable descending oil path 204; an oil inlet of the second variable amplitude one-way valve 241 is connected with an oil outlet of the second variable amplitude overflow valve 242; the oil outlet of the second variable amplitude one-way valve 241 is connected with the oil inlet of the second variable amplitude overflow valve 242.
A first variable amplitude communicating oil way 205 is arranged; the hydraulic oil in the first amplitude ascending oil path 201 flows into the second amplitude ascending oil path 203; the hydraulic oil in the second amplitude ascending oil path 203 flows into the first amplitude ascending oil path 201; the flow rate of the hydraulic oil in the first variable-amplitude ascending oil path 201 is consistent with that of the hydraulic oil in the second variable-amplitude ascending oil path 203; a second variable amplitude communication oil way 206 is arranged; the hydraulic oil in the first amplitude descending oil path 202 flows into the second amplitude descending oil path 204; the hydraulic oil in the second amplitude descending oil path 204 flows into the first amplitude descending oil path 202; the flow rate of the hydraulic oil in the first amplitude-varying descending oil path 202 is consistent with that of the hydraulic oil in the second amplitude-varying descending oil path 204; thus, the pressure born by the first amplitude ascending oil path 201 and the pressure born by the second amplitude ascending oil path 203 are consistent; the pressure born by the first amplitude-varying descending oil path 202 and the second amplitude-varying descending oil path 204 is consistent; meanwhile, the flow rates of hydraulic oil between the two amplitude ascending oil ways and between the two amplitude ascending oil ways are consistent; the flow rate of hydraulic oil is consistent through the first luffing balance valve 23 and the second balance valve; so that the flow rates of the hydraulic oil respectively entering the first luffing hydraulic motor 21 and the second luffing hydraulic motor 22 are the same; so that the first variable amplitude hydraulic motor 21 and the second variable amplitude hydraulic motor 22 can synchronously rotate; so that the amplitude-variable winch 25 can stably act; while reducing the risk of pressure imbalance in the hydraulic system.
When the amplitude-variable winch carries out lifting action; hydraulic oil is input from the first amplitude-variable ascending oil path and is input into a signal end of the first amplitude-variable reversing valve; reversing the first variable amplitude reversing valve; hydraulic oil entering from the emergency oil way flows into a variable amplitude hydraulic brake and a second variable amplitude hydraulic brake to open the brake; the first variable amplitude hydraulic motor and the second variable amplitude hydraulic motor synchronously rotate; when the amplitude-variable winch descends; hydraulic oil is input into a signal end of the first amplitude-variable reversing valve from the first amplitude-variable descending oil way; reversing the first variable amplitude reversing valve; hydraulic oil entering from the emergency oil way flows into a variable amplitude hydraulic brake and a second variable amplitude hydraulic brake to open the brake; the first amplitude-variable hydraulic motor and the second amplitude-variable hydraulic motor rotate synchronously.
Claims (6)
1. A hydraulic system for controlling the amplitude of a suspension arm comprises a first amplitude hydraulic motor, a second amplitude hydraulic motor, a first amplitude balance valve, a second amplitude balance valve, an amplitude winch, an amplitude brake mechanism, a first amplitude reversing valve and an amplitude shuttle valve; the method is characterized in that: the power output end of the first variable-amplitude hydraulic motor and the power output end of the second variable-amplitude hydraulic motor are respectively connected with a variable-amplitude winch; one end of the first variable amplitude hydraulic motor is connected with a first variable amplitude ascending oil way; the first variable-amplitude ascending oil way is connected with a control oil port BA 1; the other end of the first variable amplitude hydraulic motor is connected with a first variable amplitude descending oil way; the first amplitude-variable descending oil way is connected with a control oil port BB 1; the first amplitude-variable ascending oil way is connected with a first amplitude-variable balance valve; one end of the second variable-amplitude hydraulic motor is connected with a second variable-amplitude ascending oil way; the second variable-amplitude ascending oil way is connected with a control oil port BA 2; the other end of the second variable-amplitude hydraulic motor is connected with a second variable-amplitude descending oil way; the second amplitude-variable descending oil way is connected with a control oil port BB 2; a second variable-amplitude ascending oil path is connected with a second variable-amplitude balance valve; a first variable-amplitude oil-communicating passage is connected between the first variable-amplitude oil-rising passage and the second variable-amplitude oil-rising passage; the flow of the hydraulic oil in the first variable-amplitude ascending oil way is consistent with that of the hydraulic oil in the second variable-amplitude ascending oil way; a second variable-amplitude descending oil way is connected between the first variable-amplitude descending oil way and the second variable-amplitude descending oil way; the flow of the hydraulic oil in the first amplitude-variable descending oil way is consistent with that of the hydraulic oil in the second amplitude-variable descending oil way.
2. The hydraulic system for amplitude control of the boom as claimed in claim 1, wherein: the amplitude-variable brake mechanism comprises a first amplitude-variable hydraulic brake and a second amplitude-variable hydraulic brake; the first amplitude-variable hydraulic brake clamps the power output end of the first amplitude-variable hydraulic motor; the second variable amplitude hydraulic brake clamps the power output end of the second variable amplitude hydraulic motor; the first amplitude-variable hydraulic brake and the second amplitude-variable hydraulic brake are both connected with one end of the first amplitude-variable reversing valve; the other end of the first variable amplitude reversing valve is connected with an emergency oil way; the emergency oil way is connected with a control oil port BR; the signal end of the first amplitude-changing reversing valve is connected with the output end of the amplitude-changing shuttle valve; one input end of the amplitude-variable shuttle valve is connected with the first amplitude-variable ascending oil way; the other input end of the amplitude-variable shuttle valve is connected with the first amplitude-variable descending oil way.
3. The hydraulic system for controlling the amplitude of the boom according to claim 2, wherein: the device also comprises an amplitude-variable upper limiting reversing valve and an amplitude-variable lower limiting reversing valve; the amplitude variation upper limiting reversing valve is connected between the amplitude variation shuttle valve and the first amplitude variation ascending oil way; the amplitude-variable lower limiting reversing valve is connected between the amplitude-variable shuttle valve and the first amplitude-variable descending oil way.
4. The hydraulic system for amplitude control of the boom as claimed in claim 3, wherein: an oil drain port of the first variable-amplitude hydraulic motor, an oil drain port of the second variable-amplitude hydraulic motor, one end of the first variable-amplitude reversing valve, one end of the variable-amplitude upper limiting reversing valve and one end of the variable-amplitude lower limiting reversing valve are connected with an oil return way; the oil return oil way is connected with a control oil port BL.
5. The hydraulic system for amplitude control of the boom as claimed in claim 1, wherein: the first amplitude-variable balance valve comprises a first amplitude-variable one-way valve and a first amplitude-variable overflow valve; an oil inlet of the first variable amplitude overflow valve is connected with one end of the first variable amplitude hydraulic motor; the oil outlet of the first variable amplitude overflow valve is connected with a control oil port BA 1; a control oil port of the first variable-amplitude overflow valve is connected with the second variable-amplitude descending oil way; an oil inlet of the first variable amplitude one-way valve is connected with an oil outlet of the first variable amplitude overflow valve; an oil outlet of the first variable amplitude one-way valve is connected with an oil inlet of the first variable amplitude overflow valve.
6. The hydraulic system for amplitude control of the boom as claimed in claim 5, wherein: the second amplitude-variable balance valve comprises a second amplitude-variable one-way valve and a second amplitude-variable overflow valve; an oil inlet of the second variable amplitude overflow valve is connected with one end of the second variable amplitude hydraulic motor; an oil outlet of the second variable-amplitude overflow valve is connected with a control oil port BA 2; a control oil port of the second variable-amplitude overflow valve is connected with the second variable-amplitude descending oil way; an oil inlet of the second variable amplitude one-way valve is connected with an oil outlet of the second variable amplitude overflow valve; an oil outlet of the second variable amplitude one-way valve is connected with an oil inlet of the second variable amplitude overflow valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122731264.2U CN216691651U (en) | 2021-11-09 | 2021-11-09 | Hydraulic system for amplitude-variable control of suspension arm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122731264.2U CN216691651U (en) | 2021-11-09 | 2021-11-09 | Hydraulic system for amplitude-variable control of suspension arm |
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| Publication Number | Publication Date |
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| CN216691651U true CN216691651U (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122731264.2U Active CN216691651U (en) | 2021-11-09 | 2021-11-09 | Hydraulic system for amplitude-variable control of suspension arm |
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| CN (1) | CN216691651U (en) |
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2021
- 2021-11-09 CN CN202122731264.2U patent/CN216691651U/en active Active
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