CN213184041U - Interlocking mechanism of three-power-supply automatic transfer switch - Google Patents
Interlocking mechanism of three-power-supply automatic transfer switch Download PDFInfo
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- CN213184041U CN213184041U CN202021733148.3U CN202021733148U CN213184041U CN 213184041 U CN213184041 U CN 213184041U CN 202021733148 U CN202021733148 U CN 202021733148U CN 213184041 U CN213184041 U CN 213184041U
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Abstract
The utility model discloses an interlocking mechanism of a three-power automatic transfer switch, which comprises a shell, wherein a clapboard is arranged in the shell and divides the inner space of the shell into a first cavity and a second cavity; a first circuit breaker, a second circuit breaker and a third circuit breaker are arranged in the first cavity, the first circuit breaker is provided with a first handle, the second circuit breaker is provided with a second handle, the third circuit breaker is provided with a third handle, and the first handle, the second handle and the third handle all extend into the second cavity; and a first electromagnet, a second electromagnet and a third electromagnet are arranged in the second chamber, the first electromagnet is used for driving the first handle to open or close the first circuit breaker, the second electromagnet is used for driving the second handle to open or close the second circuit breaker, and the third electromagnet is used for driving the third handle to open or close the third circuit breaker. The utility model relates to a three power automatic transfer switch's interlocking device, its is rational in infrastructure, and has effectively improved three power transfer switch's safety in utilization.
Description
Technical Field
The utility model relates to an interlocking device of three power automatic transfer switch.
Background
In some industries and departments with higher requirements on power supply, a dual-power automatic transfer switch is generally adopted to control power supply. For specific places with very strict power supply requirements, such as hospitals, airports, telecommunication departments and the like, the requirements cannot be met generally when dual power supplies are adopted, and three power supplies are required to meet the requirements of the hospitals, airports, telecommunication departments on power supply, namely a main power supply, a first standby power supply and a second standby power supply. The prior art three-power automatic transfer switch is mostly composed of two-stage double-power automatic transfer devices. The input end of the first-stage double-power-supply automatic conversion device is a main power supply and a first standby power supply, the input end of the second-stage double-power-supply automatic conversion device is composed of the output end of the first-stage double-power-supply automatic conversion device and a second standby power supply, the output end of the second-stage double-power-supply automatic conversion device is connected with a load, and automatic conversion control of three paths of power supplies is achieved through the two-stage double-power-supply automatic. The actuating mechanism of the three-power-supply automatic change-over switch needs two sets of independent mechanical interlocking devices of the double-power-supply automatic change-over device, the number of the devices controlled by the three-power-supply automatic change-over switch is increased by the scheme, the use cost is increased, the use risk is increased, and the safety factor of the three-power-supply automatic change-over switch is reduced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a three power automatic transfer switch's interlocking device, its is rational in infrastructure, and has effectively improved three power transfer switch's safety in utilization.
In order to achieve the purpose, the technical scheme of the utility model is to design an interlocking mechanism of a three-power automatic transfer switch, which comprises a shell, wherein a clapboard is arranged in the shell and divides the inner space of the shell into a first cavity and a second cavity;
a first circuit breaker, a second circuit breaker and a third circuit breaker are arranged in the first chamber, a first handle is arranged on the first circuit breaker, a second handle is arranged on the second circuit breaker, and a third handle is arranged on the third circuit breaker;
the second chamber is internally provided with a first electromagnet, a second electromagnet and a third electromagnet, the first electromagnet is fixed at the left end of the partition plate through a first bracket, the movable iron core of the first electromagnet is arranged towards the right, the movable iron core of the first electromagnet is connected with a first transverse sliding strip, the first transverse sliding strip is slidably connected to the partition plate, the top of the first transverse sliding strip is provided with a first push block, the first push block is provided with a first opening, the partition plate is provided with a first strip-shaped hole corresponding to the first push block, the first handle penetrates through the first strip-shaped hole and is placed in the first opening, the second electromagnet and the third electromagnet are fixed at the right end of the partition plate through a second bracket, the movable iron cores of the second electromagnet and the third electromagnet are arranged towards the left, the second electromagnet is positioned above the first electromagnet, and the movable iron core of the second electromagnet is connected with a second transverse sliding strip, the second transverse sliding strip is connected to the partition board in a sliding manner, a second push block is arranged at the top of the second transverse sliding strip, a second opening is formed in the second push block, a second strip-shaped hole corresponding to the second push block is formed in the partition board, the second handle penetrates through the second strip-shaped hole and is placed in the second opening, the third electromagnet is located below the first electromagnet, a movable iron core of the third electromagnet is connected with a third transverse sliding strip, the third transverse sliding strip is connected to the partition board in a sliding manner, a third push block is arranged at the bottom of the third transverse sliding strip, a third opening is formed in the third push block, a third strip-shaped hole corresponding to the third push block is formed in the partition board, the third handle penetrates through the third strip-shaped hole and is placed in the third opening, a first stop block corresponding to the second transverse sliding strip is arranged at the top of the right end of the first transverse sliding strip, and a second stop block corresponding to the third transverse sliding strip is arranged at the bottom of the right end of the first transverse sliding strip, a vertical slide bar is arranged between the second transverse slide bar and the third transverse slide bar and is connected to the partition board in a sliding manner, a first through hole corresponding to the vertical slide bar is formed in the second transverse slide bar, a second through hole corresponding to the vertical slide bar is formed in the third transverse slide bar, the upper end and the lower end of the vertical slide bar extend into the first through hole and the second through hole respectively, a first driven inclined plane and a second driven inclined plane are arranged at the upper end and the lower end of the vertical slide bar respectively, a first driving inclined plane corresponding to the first driven inclined plane is arranged on the hole wall of the first through hole, a second driving inclined plane corresponding to the second driven inclined plane is arranged on the hole wall of the second through hole, an upper convex block and a lower convex block are symmetrically arranged at the side part of the vertical slide bar, a fixed block positioned between the upper convex block and the lower convex block is arranged on the partition board, and an upper guide rod penetrating through the upper convex block is arranged, the upper lug is provided with a sliding hole for the upper guide rod to penetrate through, an upper spring sleeved on the upper guide rod is connected between the upper lug and the fixed block, a lower guide rod penetrating through the lower lug is arranged on the fixed block, the lower lug is provided with a sliding hole for the lower guide rod to penetrate through, and a lower spring sleeved on the lower guide rod is connected between the lower lug and the fixed block.
Preferably, the length of the first strip-shaped hole, the length of the second strip-shaped hole and the length of the third strip-shaped hole are equal.
Preferably, the upper end of the upper guide rod is provided with an upper limiting block, and the lower end of the lower guide rod is provided with a lower limiting block.
Preferably, the first bracket and the second bracket are both L-shaped structures.
The utility model has the advantages and the beneficial effects that: the interlocking mechanism of the three-power-supply automatic transfer switch is reasonable in structure and effectively improves the use safety of the three-power-supply automatic transfer switch.
Under initial state, the movable iron cores of the first electromagnet, the second electromagnet and the third electromagnet are all in a retraction state, the first handle is located at the left end of the first strip-shaped hole, the second handle and the third handle are respectively located at the right ends of the second strip-shaped hole and the third strip-shaped hole, and the first circuit breaker, the second circuit breaker and the third circuit breaker are all located in a brake-separating state at the moment.
When a common power supply needs to be switched on, the movable iron core of the first electromagnet is controlled to extend out, so that the first transverse sliding strip is driven to slide rightwards, the first handle is pushed by the first push block to move to the right end of the first strip-shaped hole, the first circuit breaker is in a closing state at the moment, and the common power supply is switched on; and after the first transverse sliding strip slides rightwards, the first stop block and the second stop block on the first transverse sliding strip abut against the second transverse sliding strip and the third transverse sliding strip respectively, so that the second transverse sliding strip and the third transverse sliding strip cannot move leftwards, and the second circuit breaker and the third circuit breaker are locked in a brake-off state.
When a first standby power supply needs to be switched on, the movable iron core of the first electromagnet is controlled to retract, so that the first transverse sliding strip is driven to slide leftwards, the first handle is pushed by the first push block to move to the left end of the first strip-shaped hole, the first breaker is in a brake-off state at the moment, the common power supply is switched off, then the movable iron core of the second electromagnet is controlled to extend out, so that the second transverse sliding strip is driven to slide leftwards, the second handle is pushed by the second push block to move to the left end of the second strip-shaped hole, the second breaker is in a switch-on state at the moment, and the first standby power supply is switched on; after the second transverse sliding strip slides leftwards, the second transverse sliding strip abuts against the first stop block, therefore, the first transverse sliding strip cannot move rightwards, the first circuit breaker is locked in the opening state, in the process that the second transverse sliding strip slides leftwards, the vertical sliding strip is driven to move downwards through the matching of the first driving inclined plane and the first driven inclined plane, the upper end of the vertical sliding strip is made to exit from the first through hole and compress the upper spring and stretch the lower spring, the third transverse sliding strip can be blocked after the vertical sliding strip moves downwards, the third transverse sliding strip is prevented from moving leftwards, and therefore the third circuit breaker is also locked in the opening state.
When a second standby power supply needs to be switched on, the movable iron core of the second electromagnet is controlled to retract, so that the second transverse sliding strip is driven to slide rightwards, the second handle is pushed by the second push block to move to the right end of the second strip-shaped hole, the second circuit breaker is in a switching-off state at the moment, the first standby power supply is switched off, in the process that the second transverse sliding strip slides rightwards, the vertical sliding strip moves upwards under the action of elastic restoring force of the upper spring and the lower spring, the upper end of the vertical sliding strip is inserted into the first through hole, the vertical sliding strip releases the blocking of the third transverse sliding strip, then the movable iron core of the third electromagnet is controlled to extend out, so that the third transverse sliding strip is driven to slide leftwards, the third handle is pushed by the third push block to move to the left end of the third strip-shaped hole, the third circuit breaker is in a switching-on state at the moment, and the; after the third transverse sliding strip slides leftwards, the third transverse sliding strip abuts against the second stop block, so that the first transverse sliding strip cannot move rightwards, the first circuit breaker is locked in the brake-separating state, in the process that the third transverse sliding strip slides leftwards, the vertical sliding strip is driven to move upwards through the matching of the second driving inclined plane and the second driven inclined plane, the lower end of the vertical sliding strip is made to exit from the second through hole and compress the lower spring and stretch the upper spring, the second transverse sliding strip can be stopped after the vertical sliding strip moves upwards, the second transverse sliding strip is prevented from moving leftwards, and the second circuit breaker is also locked in the brake-separating state.
Drawings
Fig. 1 is a first schematic diagram of the present invention.
Fig. 2 is a second schematic diagram of the present invention.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
The utility model discloses the technical scheme who specifically implements is:
as shown in fig. 1 and 2, an interlocking mechanism of a three-power automatic transfer switch includes a housing 1, a partition plate 2 is disposed in the housing 1, and the partition plate 2 divides an inner space of the housing 1 into a first chamber and a second chamber;
a first circuit breaker, a second circuit breaker and a third circuit breaker are arranged in the first chamber, a first handle 3 is arranged on the first circuit breaker, a second handle 4 is arranged on the second circuit breaker, and a third handle 5 is arranged on the third circuit breaker;
a first electromagnet 6, a second electromagnet 7 and a third electromagnet 8 are arranged in the second chamber, the first electromagnet 6 is fixed at the left end of the partition plate 2 through a first support 9, a movable iron core of the first electromagnet 6 is arranged towards the right, the movable iron core of the first electromagnet 6 is connected with a first transverse sliding strip 10, the first transverse sliding strip 10 is slidably connected to the partition plate 2, a first push block 11 is arranged at the top of the first transverse sliding strip 10, a first opening is arranged on the first push block 11, a first strip-shaped hole 12 corresponding to the first push block 11 is arranged on the partition plate 2, the first handle 3 penetrates through the first strip-shaped hole 12 and is arranged in the first opening, the second electromagnet 7 and the third electromagnet 8 are fixed at the right end of the partition plate 2 through a second support 13, the movable iron cores of the second electromagnet 7 and the third electromagnet 8 are arranged towards the left, the second electromagnet 7 is positioned above the first electromagnet 6, the movable iron core of the second electromagnet 7 is connected with a second transverse sliding bar 14, the second transverse sliding bar 14 is slidably connected to the partition plate 2, a second push block 15 is arranged at the top of the second transverse sliding bar 14, a second opening is arranged on the second push block 15, a second strip-shaped hole 16 corresponding to the second push block 15 is arranged on the partition plate 2, the second handle 4 passes through the second strip-shaped hole 16 and is placed in the second opening, the third electromagnet 8 is positioned below the first electromagnet 6, the movable iron core of the third electromagnet 8 is connected with a third transverse sliding bar 17, the third transverse sliding bar 17 is slidably connected to the partition plate 2, a third push block 18 is arranged at the bottom of the third transverse sliding bar 17, a third opening is arranged on the third push block 18, a third strip-shaped hole 19 corresponding to the third push block 18 is arranged on the partition plate 2, the third handle 5 passes through the third strip-shaped hole 19 and is placed in the third opening, a first stop block 20 corresponding to the second transverse slide bar 14 is arranged at the top of the right end of the first transverse slide bar 10, a second stop block 21 corresponding to the third transverse slide bar 17 is arranged at the bottom of the right end of the first transverse slide bar 10, a vertical slide bar 22 is arranged between the second transverse slide bar 14 and the third transverse slide bar 17, the vertical slide bar 22 is connected to the partition board 2 in a sliding manner, a first through hole 23 corresponding to the vertical slide bar 22 is arranged on the second transverse slide bar 14, a second through hole 24 corresponding to the vertical slide bar 22 is arranged on the third transverse slide bar 17, the upper end and the lower end of the vertical slide bar 22 respectively extend into the first through hole 23 and the second through hole 24, a first driven inclined surface 25 and a second driven inclined surface 26 are respectively arranged at the upper end and the lower end of the vertical slide bar 22, and a first driving inclined surface 27 corresponding to the first driven inclined surface 26 is arranged on the hole wall of the first through hole 23, the wall of the second through hole 24 is provided with a second driving inclined surface 28 corresponding to the second driven inclined surface 26, the side of the vertical slide bar 22 is symmetrically provided with an upper lug 29 and a lower lug 30, the partition board 2 is provided with a fixing block 31 positioned between the upper lug 29 and the lower lug 30, the fixing block 31 is provided with an upper guide rod 32 penetrating through the upper lug 29, the upper lug 29 is provided with a slide hole for the upper guide rod 32 to penetrate through, an upper spring 33 sleeved on the upper guide rod 32 is connected between the upper lug 29 and the fixing block 31, the fixing block 31 is provided with a lower guide rod 34 penetrating through the lower lug 30, the lower lug 30 is provided with a slide hole for the lower guide rod 34 to penetrate through, and a lower spring 35 sleeved on the lower guide rod 34 is connected between the lower lug 30 and the fixing block 31.
The length of the first bar hole 12, the length of the second bar hole 16, and the length of the third bar hole 19 are equal to each other.
An upper limit block 36 is provided at the upper end of the upper guide bar 32, and a lower limit block 37 is provided at the lower end of the lower guide bar 34.
The first bracket 9 and the second bracket 13 are both L-shaped structures.
The utility model has the advantages and the beneficial effects that: the interlocking mechanism of the three-power-supply automatic transfer switch is reasonable in structure and effectively improves the use safety of the three-power-supply automatic transfer switch.
Under initial state, the movable iron cores of the first electromagnet 6, the second electromagnet 7 and the third electromagnet 8 are all in a retraction state, the first handle 3 is located at the left end of the first strip-shaped hole 12, the second handle 4 and the third handle 5 are respectively located at the right ends of the second strip-shaped hole 16 and the third strip-shaped hole 19, and at the moment, the first circuit breaker, the second circuit breaker and the third circuit breaker are all in a brake separating state.
When a common power supply needs to be switched on, the movable iron core of the first electromagnet 6 is controlled to extend out, so that the first transverse sliding strip 10 is driven to slide rightwards, the first handle 3 is pushed by the first push block 11 to move to the right end of the first strip-shaped hole 12, the first circuit breaker is in a closing state at the moment, and the common power supply is switched on; and after the first transverse slide bar 10 slides to the right, the first stop 20 and the second stop 21 on the first transverse slide bar 10 will abut against the second transverse slide bar 14 and the third transverse slide bar 17, respectively, so that the second transverse slide bar 14 and the third transverse slide bar 17 cannot move to the left, and the second breaker and the third breaker are locked in the opening state.
When a first standby power supply needs to be switched on, the movable iron core of the first electromagnet 6 is controlled to retract, so that the first transverse sliding strip 10 is driven to slide leftwards, the first handle 3 is pushed by the first push block 11 to move to the left end of the first strip-shaped hole 12, the first circuit breaker is in a brake-off state at the moment, a common power supply is switched off, then the movable iron core of the second electromagnet 7 is controlled to extend, so that the second transverse sliding strip 14 is driven to slide leftwards, the second handle 4 is pushed by the second push block 15 to move to the left end of the second strip-shaped hole 16, the second circuit breaker is in a switch-on state at the moment, and the first standby power supply is switched on; when the second transverse slide bar 14 slides leftwards, the second transverse slide bar 14 abuts against the first stop block 20, so that the first transverse slide bar 10 cannot move rightwards, and the first circuit breaker is locked in the opening state, and in the process that the second transverse slide bar 14 slides leftwards, the vertical slide bar 22 is driven to move downwards through the matching of the first driving inclined plane 27 and the first driven inclined plane 25, so that the upper end of the vertical slide bar 22 exits the first through hole 23 and compresses the upper spring 33 and the lower tension spring 35, and after the vertical slide bar 22 moves downwards, the third transverse slide bar 17 can be blocked, so that the third transverse slide bar 17 is prevented from moving leftwards, and therefore, the third circuit breaker is also locked in the opening state.
When the second standby power supply needs to be switched on, the movable iron core of the second electromagnet 7 is controlled to retract, so that the second transverse slide bar 14 is driven to slide rightwards, and the second handle 4 is pushed by the second push block 15 to move to the right end of the second strip-shaped hole 16, at the moment, the second breaker is in a brake-off state, the first standby power supply is disconnected, during the rightward sliding of the second horizontal slide 14, the vertical slide 22 will move upward under the elastic restoring force of the upper spring 33 and the lower spring 35, the upper end of the vertical slide 22 will be inserted into the first through hole 23, and the vertical slide bar 22 will release the blocking of the third transverse slide bar 17, and then the movable iron core of the third electromagnet 8 is controlled to extend out, thereby driving the third transverse slide bar 17 to slide leftwards, and pushing the third handle 5 to move to the left end of the third strip-shaped hole 19 through the third push block 18, at this time, the third breaker is in a closing state, and the second standby power supply is switched on; when the third transverse slide bar 17 slides to the left, the third transverse slide bar 17 abuts against the second stop 21, so that the first transverse slide bar 10 cannot move to the right, and the first circuit breaker is locked in the open state, and in the process that the third transverse slide bar 17 slides to the left, the vertical slide bar 22 is driven to move upwards through the matching of the second driving inclined plane 28 and the second driven inclined plane 26, so that the lower end of the vertical slide bar 22 exits the second through hole 24 and compresses the lower spring 35 and stretches the upper spring 33, and the second transverse slide bar 14 can be stopped after the vertical slide bar 22 moves upwards, so that the second transverse slide bar 14 is prevented from moving to the left, and therefore the second circuit breaker is also locked in the open state.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (4)
1. The interlocking mechanism of the three-power automatic transfer switch is characterized by comprising a shell, wherein a partition plate is arranged in the shell and divides the inner space of the shell into a first chamber and a second chamber;
a first circuit breaker, a second circuit breaker and a third circuit breaker are arranged in the first chamber, a first handle is arranged on the first circuit breaker, a second handle is arranged on the second circuit breaker, and a third handle is arranged on the third circuit breaker;
the second chamber is internally provided with a first electromagnet, a second electromagnet and a third electromagnet, the first electromagnet is fixed at the left end of the partition plate through a first bracket, the movable iron core of the first electromagnet is arranged towards the right, the movable iron core of the first electromagnet is connected with a first transverse sliding strip, the first transverse sliding strip is slidably connected to the partition plate, the top of the first transverse sliding strip is provided with a first push block, the first push block is provided with a first opening, the partition plate is provided with a first strip-shaped hole corresponding to the first push block, the first handle penetrates through the first strip-shaped hole and is placed in the first opening, the second electromagnet and the third electromagnet are fixed at the right end of the partition plate through a second bracket, the movable iron cores of the second electromagnet and the third electromagnet are arranged towards the left, the second electromagnet is positioned above the first electromagnet, and the movable iron core of the second electromagnet is connected with a second transverse sliding strip, the second transverse sliding strip is connected to the partition board in a sliding manner, a second push block is arranged at the top of the second transverse sliding strip, a second opening is formed in the second push block, a second strip-shaped hole corresponding to the second push block is formed in the partition board, the second handle penetrates through the second strip-shaped hole and is placed in the second opening, the third electromagnet is located below the first electromagnet, a movable iron core of the third electromagnet is connected with a third transverse sliding strip, the third transverse sliding strip is connected to the partition board in a sliding manner, a third push block is arranged at the bottom of the third transverse sliding strip, a third opening is formed in the third push block, a third strip-shaped hole corresponding to the third push block is formed in the partition board, the third handle penetrates through the third strip-shaped hole and is placed in the third opening, a first stop block corresponding to the second transverse sliding strip is arranged at the top of the right end of the first transverse sliding strip, and a second stop block corresponding to the third transverse sliding strip is arranged at the bottom of the right end of the first transverse sliding strip, a vertical slide bar is arranged between the second transverse slide bar and the third transverse slide bar and is connected to the partition board in a sliding manner, a first through hole corresponding to the vertical slide bar is formed in the second transverse slide bar, a second through hole corresponding to the vertical slide bar is formed in the third transverse slide bar, the upper end and the lower end of the vertical slide bar extend into the first through hole and the second through hole respectively, a first driven inclined plane and a second driven inclined plane are arranged at the upper end and the lower end of the vertical slide bar respectively, a first driving inclined plane corresponding to the first driven inclined plane is arranged on the hole wall of the first through hole, a second driving inclined plane corresponding to the second driven inclined plane is arranged on the hole wall of the second through hole, an upper convex block and a lower convex block are symmetrically arranged at the side part of the vertical slide bar, a fixed block positioned between the upper convex block and the lower convex block is arranged on the partition board, and an upper guide rod penetrating through the upper convex block is arranged, the upper lug is provided with a sliding hole for the upper guide rod to penetrate through, an upper spring sleeved on the upper guide rod is connected between the upper lug and the fixed block, a lower guide rod penetrating through the lower lug is arranged on the fixed block, the lower lug is provided with a sliding hole for the lower guide rod to penetrate through, and a lower spring sleeved on the lower guide rod is connected between the lower lug and the fixed block.
2. The interlock mechanism of a triple power automatic transfer switch according to claim 1, wherein the length of the first bar-shaped hole, the length of the second bar-shaped hole, and the length of the third bar-shaped hole are equal.
3. The interlock mechanism of a three power automatic transfer switch according to claim 2, wherein an upper stopper is provided at an upper end of the upper guide bar, and a lower stopper is provided at a lower end of the lower guide bar.
4. The interlock mechanism of a three power automatic transfer switch according to claim 3, wherein the first bracket and the second bracket are each an L-shaped structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021733148.3U CN213184041U (en) | 2020-08-19 | 2020-08-19 | Interlocking mechanism of three-power-supply automatic transfer switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021733148.3U CN213184041U (en) | 2020-08-19 | 2020-08-19 | Interlocking mechanism of three-power-supply automatic transfer switch |
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| Publication Number | Publication Date |
|---|---|
| CN213184041U true CN213184041U (en) | 2021-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021733148.3U Active CN213184041U (en) | 2020-08-19 | 2020-08-19 | Interlocking mechanism of three-power-supply automatic transfer switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213184041U (en) |
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2020
- 2020-08-19 CN CN202021733148.3U patent/CN213184041U/en active Active
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