CN218363504U - Clamp for cylinder body machining - Google Patents
Clamp for cylinder body machining Download PDFInfo
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- CN218363504U CN218363504U CN202222368799.2U CN202222368799U CN218363504U CN 218363504 U CN218363504 U CN 218363504U CN 202222368799 U CN202222368799 U CN 202222368799U CN 218363504 U CN218363504 U CN 218363504U
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Abstract
The utility model relates to a clamp for processing a cylinder body, which comprises a workbench, a first positioning component, a second positioning component and a third positioning component; the first positioning component comprises a Y-shaped positioning piece, one contact of the Y-shaped positioning piece is connected with the workbench, and the other two contacts of the Y-shaped positioning piece are abutted with the crankshaft semicircular hole of the cylinder body; the second positioning assembly comprises a positioning sleeve, a first driving piece and two sliding blocks which are oppositely arranged, the positioning sleeve can be arranged in a cylinder hole of the cylinder body, the two sliding blocks are both in sliding connection with the positioning sleeve, and the first driving piece is fixedly connected with the positioning sleeve; the third positioning assembly comprises a second driving piece and two clamping blocks, the two clamping blocks are rotatably connected with the workbench to form a clamping gap, and the second driving piece is fixedly connected with the workbench; the problem of when the cylinder body when the great manufacturing procedure of external force such as drilling and milling, because the gravity of cylinder body self is great, only can not effectively fix the cylinder body through the packing force, the cylinder body easily shifts, and the machining precision is low is solved.
Description
Technical Field
The utility model relates to an engine processing technology field especially relates to an anchor clamps are used in cylinder body processing.
Background
The engine is a machine capable of converting other forms of energy into mechanical energy, and in order to ensure efficient and stable operation of the engine, the requirement on the machining precision of parts such as a cylinder body, a cylinder cover and the like is very high. In the process of drilling and milling an exhaust surface of an engine cylinder block, the cylinder block needs to be kept fixed, and at the moment, a special clamp for fixing the engine cylinder block needs to be equipped.
For example, a novel automobile engine cylinder body adds clamping apparatus that utility model patent application No. CN201721887924.3 proposed, wherein, including workstation, mounting panel, location structure and the tight structure of clamp, mounting panel and workstation fixed connection make the cylinder body be fixed in the mounting panel through location structure to through pressing from both sides tight structure and mounting panel cooperation, make the cylinder body press from both sides tightly on the workstation, thereby accomplish the location clamp work to the cylinder body.
However, when the cylinder body is subjected to a machining process with a large external force such as drilling and milling, the cylinder body cannot be effectively fixed only by pressing force due to the large gravity of the cylinder body, the cylinder body is easy to displace, and the machining precision is low.
SUMMERY OF THE UTILITY MODEL
In view of the above, there is a need for providing a cylinder block processing fixture, which is used to solve the problems that when a cylinder block is subjected to a processing procedure with a large external force, such as drilling and milling, the cylinder block cannot be effectively fixed only by pressing force due to the large gravity of the cylinder block, the cylinder block is easy to displace, and the processing precision is low.
The utility model provides a clamp for processing a cylinder body, which comprises a workbench, a first positioning component, a second positioning component and a third positioning component; the first positioning component comprises a Y-shaped positioning piece, one contact of the Y-shaped positioning piece is connected with the workbench, and the other two contacts of the Y-shaped positioning piece are abutted to a crankshaft semicircular hole of the cylinder body; the second positioning assembly comprises a positioning sleeve, a first driving piece and two sliding blocks which are oppositely arranged, the positioning sleeve can be arranged in a cylinder hole of the cylinder body, the two sliding blocks are connected with the positioning sleeve in a sliding mode, the sliding direction of the two sliding blocks is perpendicular to the inner wall of the cylinder hole, the first driving piece is fixedly connected with the positioning sleeve, the output end of the first driving piece is connected with the two sliding blocks, and the first driving piece is used for driving the two sliding blocks to move back to abut against the inner wall of the cylinder hole; the third locating component comprises a second driving piece and two clamping blocks, the two clamping blocks are connected with the workbench in a rotating mode and form a clamping gap, the second driving piece is fixedly connected with the workbench, the output end of the second driving piece is connected with the two clamping blocks, and the clamping gap can be adjusted to be used for clamping the crankshaft crotch of the cylinder body.
Further, Y type setting element includes fixed block and two supporting pins, the bottom of fixed block with the workstation can be dismantled and be connected, the top of fixed block is provided with two relatively the supporting pin, two the supporting pin relative slope set up and with fixed block form a Y type structure, two the top of supporting pin all with the arcwall face butt of bent axle semicircle orifice.
Further, the bottom of the positioning sleeve can be detachably connected with the workbench through the first driving piece.
Further, first driving piece includes first hydro-cylinder and first wedge, first hydro-cylinder can dismantle set up in on the workstation, the output of first hydro-cylinder with first wedge is connected for the drive first wedge removes along vertical direction, the wedge face and two of first wedge the slider slides the butt, the position sleeve place in on the first hydro-cylinder.
Furthermore, the second driving piece comprises a second oil cylinder and a second wedge-shaped block, the second oil cylinder is detachably arranged on the workbench, the output end of the second oil cylinder is connected with the second wedge-shaped block, and the wedge-shaped surface of the second wedge-shaped block is connected with the two clamping blocks in a sliding and abutting mode.
Furthermore, one side, opposite to the clamping blocks, of each of the two clamping blocks is fixedly connected with a positioning pin, and a clamping gap is formed between the two positioning pins and used for clamping the crankshaft open crotch of the cylinder body.
Furthermore, one side opposite to the clamping block is fixedly connected with a butting pin, and the butting pin is in sliding butting with the wedge surface of the second wedge block.
Furthermore, the cylinder body clamping device further comprises a pressing component, the pressing component is fixedly connected with the workbench, the pressing component is provided with a pressing end, and a pressing gap used for clamping the cylinder body is formed between the pressing end and the workbench.
Furthermore, the compressing assembly comprises a compressing oil cylinder, a driving arm, a connecting arm and a pressing plate, the compressing oil cylinder is fixedly arranged on the workbench, the output end of the compressing oil cylinder is hinged to the driving arm, the driving arm is hinged to the workbench through the connecting arm, one end of the driving arm is hinged to the output end of the compressing oil cylinder, and the other end of the driving arm is fixedly connected with the pressing plate.
Further, still include supporting component, supporting component including fixed set up in a plurality of fixed pins on the workstation, it is a plurality of the top of fixed pin with the bottom cooperation of cylinder body is connected.
Compared with the prior art, the first positioning assembly comprises a Y-shaped positioning part, one contact of the Y-shaped positioning part is connected with the workbench, the other two contacts of the Y-shaped positioning part are abutted with the crankshaft semicircular hole of the cylinder body, the top of the cylinder body can be fixed from the crankshaft semicircular hole of the cylinder body, the cylinder body can be effectively supported, and the cylinder body can be prevented from shaking along the circumferential direction, meanwhile, the second positioning assembly comprises a positioning sleeve, a first driving part and two opposite sliding blocks, the positioning sleeve can be arranged in the cylinder hole of the cylinder body, the two sliding blocks are both in sliding connection with the positioning sleeve, the sliding direction is perpendicular to the inner wall of the cylinder hole, the first driving part is fixedly connected with the positioning sleeve, the output end is connected with the two sliding blocks, the two sliding blocks are driven to move back to abut against the inner wall of the cylinder hole, and the cylinder body can be fixed from the inner wall of the cylinder hole, through the interaction force between the sliding block and the cylinder hole, the movement of the cylinder body along the circumferential direction or the vertical direction can be limited, furthermore, through the arrangement of the third positioning assembly, the third positioning assembly comprises a second driving piece and two clamping blocks, the two clamping blocks are rotatably connected with the workbench and form a clamping gap, the second driving piece is fixedly connected with the workbench, the output end of the second driving piece is connected with the two clamping blocks, the size of the clamping gap can be adjusted to be used for clamping the crankshaft crotch of the cylinder body, the cylinder body can be positioned at the position of the crankshaft crotch, the movement of the cylinder body along the circumferential direction can be limited, through the arrangement of the first positioning assembly, the second positioning assembly and the third positioning assembly, the cylinder body can be limited on the workbench from multiple directions and angles, when the cylinder body is applicable to the machining process with large external force such as drilling and milling, the cylinder body can be effectively prevented from shaking, and the machining precision is improved.
Drawings
Fig. 1 is a schematic structural diagram of an entire embodiment of a cylinder machining fixture according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a first positioning assembly in an embodiment of the clamp for cylinder machining according to the embodiment of the present invention;
fig. 3 is a schematic structural view of a second positioning assembly in an embodiment of the clamp for cylinder machining according to the embodiment of the present invention;
fig. 4 is a schematic view illustrating a position of the third positioning assembly mounted at the crankshaft crotch of the cylinder in an embodiment of the clamp for machining a cylinder according to the present invention;
fig. 5 is an enlarged schematic view of a portion a in fig. 4 in an embodiment of the clamp for machining a cylinder body according to the embodiment of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the invention, which is to be read in connection with the accompanying drawings, forms a part of this application, and together with the embodiments of the invention, serve to explain the principles of the invention and not to limit its scope.
As shown in fig. 1, fig. 2, fig. 3 and fig. 5, the present invention provides a fixture for cylinder block machining, which includes a worktable 100, a first positioning assembly 200, a second positioning assembly 300 and a third positioning assembly 400; the first positioning assembly 200 comprises a Y-shaped positioning member 210, one contact of the Y-shaped positioning member 210 is connected with the workbench 100, and the other two contacts of the Y-shaped positioning member 210 are abutted with the crankshaft semicircular hole of the cylinder; the second positioning assembly 300 comprises a positioning sleeve 310, a first driving member 320 and two sliding blocks 330 arranged oppositely, the positioning sleeve 310 can be arranged in a cylinder hole of the cylinder body, the two sliding blocks 330 are both connected with the positioning sleeve 310 in a sliding manner, the sliding direction of the two sliding blocks is perpendicular to the inner wall of the cylinder hole, the first driving member 320 is fixedly connected with the positioning sleeve 310, the output end of the first driving member is connected with the two sliding blocks 330, and the first driving member 320 and the two sliding blocks 330 are used for driving the two sliding blocks 330 to move back to abut against the inner wall of the cylinder hole; the third positioning assembly 400 includes a second driving member 410 and two clamping blocks 420, the two clamping blocks 420 are rotatably connected with the worktable 100 and form a clamping gap, the second driving member 410 is fixedly connected with the worktable 100, and the output end is connected with the two clamping blocks 420, the size of the clamping gap can be adjusted to clamp the crankshaft crotch of the cylinder block.
In this embodiment, by providing the first positioning assembly 200, the first positioning assembly 200 comprises a Y-shaped positioning member 210, one contact of the Y-shaped positioning member 210 is connected to the worktable 100, the other two contacts of the Y-shaped positioning member 210 are abutted to the crankshaft semicircular hole of the cylinder body, so that the top of the cylinder body can be fixed from the crankshaft semicircular hole of the cylinder body, the cylinder body can be effectively supported, and the cylinder body can be prevented from shaking along the circumferential direction, meanwhile, by providing the second positioning assembly 300, the second positioning assembly 300 comprises a positioning sleeve 310, a first driving member 320 and two sliding blocks 330 arranged oppositely, the positioning sleeve 310 can be arranged in the cylinder hole of the cylinder body, both sliding blocks 330 are slidably connected to the positioning sleeve 310, and the sliding direction is perpendicular to the inner wall of the cylinder hole, the first driving member 320 is fixedly connected to the positioning sleeve 310, and the output end is connected to both sliding blocks 330, so as to drive the two sliding blocks 330 to move back and forth to abut to the inner wall of the cylinder hole, the cylinder body can be fixed from the inner wall of the cylinder hole, the movement of the cylinder body along the circumferential direction or the vertical direction can be limited through the interaction force between the sliding block 330 and the cylinder hole, furthermore, through arranging the third positioning assembly 400, the third positioning assembly 400 comprises a second driving part 410 and two clamping blocks 420, the two clamping blocks 420 are rotatably connected with the workbench 100 and form a clamping gap, the second driving part 410 is fixedly connected with the workbench 100, the output end is connected with the two clamping blocks 420, the size of the clamping gap can be adjusted to clamp the crankshaft crotch of the cylinder body, the cylinder body can be positioned from the crankshaft crotch, the movement of the cylinder body along the circumferential direction can be limited, through arranging the first positioning assembly 200, the second positioning assembly 300 and the third positioning assembly 400, the cylinder body can be limited on the workbench 100 from multiple directions and angles, when the cylinder body is suitable for a processing procedure with larger external force such as drilling and milling, the cylinder body can be effectively prevented from shaking, and the machining precision is improved.
The table 100 in this embodiment provides load bearing for the cylinder, the first positioning assembly 200, the second positioning assembly 300, and the third positioning assembly 400.
The first positioning assembly 200 in this embodiment is used to support the structure of the fixed cylinder block from the crankshaft semicircular hole of the cylinder block. Specifically, the first positioning assembly 200 includes a Y-shaped positioning member 210, one contact of the Y-shaped positioning member 210 is connected to the worktable 100, and the other two contacts of the Y-shaped positioning member 210 are abutted to the crankshaft semicircular hole of the cylinder, and are abutted to the arc-shaped surface of the crankshaft semicircular hole through the Y-shaped positioning member 210, so as to support the cylinder at a non-planar position.
As shown in fig. 2, in one embodiment, the Y-shaped positioning element 210 includes a fixed block 220 and two support pins, the bottom of the fixed block 220 is detachably connected to the worktable 100, the top of the fixed block 220 is provided with two support pins, the two support pins are relatively inclined and form a Y-shaped structure with the fixed block 220, and the top ends of the two support pins are abutted to the arc-shaped surface of the crankshaft semicircular hole.
As shown in fig. 3, the second positioning assembly 300 in the present embodiment serves to fix the structure of the cylinder block from the cylinder bore. Specifically, the second positioning assembly 300 includes a positioning sleeve 310, a first driving member 320 and two sliding blocks 330 disposed oppositely, the positioning sleeve 310 may be disposed in a cylinder hole of the cylinder body, the two sliding blocks 330 are both slidably connected to the positioning sleeve 310 and disposed perpendicular to the inner wall of the cylinder hole in a sliding direction, the first driving member 320 is fixedly connected to the positioning sleeve 310, and the output end is connected to the two sliding blocks 330, so as to drive the two sliding blocks 330 to move back to the inner wall of the cylinder hole for abutting.
In one embodiment, the bottom of the positioning sleeve 310 may be removably coupled to the table 100 via the first drive 320. Specifically, first driving piece 320 includes first hydro-cylinder 321 and first wedge 322, and first hydro-cylinder 321 can dismantle and set up on workstation 100, and the output and the first wedge 322 of first hydro-cylinder 321 are connected for drive first wedge 322 removes along vertical direction, and the wedge face and two sliders 330 slip butt of first wedge 322, and location sleeve 310 places on first hydro-cylinder 321, and one side that two sliders 330 carried on the back mutually all is provided with a arch 331.
The third positioning member 400 in this embodiment is used to fix the cylinder block from the crotch of the crankshaft. Specifically, the third positioning assembly 400 includes a second driving member 410 and two clamping blocks 420, the two clamping blocks 420 are rotatably connected with the worktable 100 and form a clamping gap, the second driving member 410 is fixedly connected with the worktable 100, and the output end of the second driving member is connected with the two clamping blocks 420, so that the size of the clamping gap can be adjusted to clamp the crankshaft crotch of the cylinder block.
As shown in fig. 4 to 5, in an embodiment, the second driving member 410 includes a second cylinder 411 and a second wedge block 412, the second cylinder 411 is detachably disposed on the workbench 100, an output end of the second cylinder 411 is connected to the second wedge block 412, and a wedge surface of the second wedge block 412 is slidably abutted to the two clamping blocks 420.
In order to clamp the crankshaft crotch of the cylinder body conveniently, a positioning pin 421 is fixedly connected to one side of each of the two clamping blocks 420, and a clamping gap is formed between the two positioning pins 421 to clamp the crankshaft crotch of the cylinder body.
In order to facilitate the second wedge block 412 to push the clamping blocks 420 to rotate, wherein one side of each of the two clamping blocks 420 opposite to each other is fixedly connected with an abutting pin 422, and the two abutting pins 422 are in sliding abutting contact with the wedge-shaped surface of the second wedge block 412.
The embodiment further comprises a pressing assembly 500, the pressing assembly 500 is fixedly connected with the workbench 100, the pressing assembly 500 has a pressing end, and a pressing gap for clamping the cylinder body is formed between the pressing end and the workbench 100. Wherein, the pressing end of the pressing assembly 500 can be matched with the first positioning assembly 200, so that the cylinder body is firmly fixed on the workbench 100 along the vertical direction.
As shown in fig. 3, in one embodiment, the pressing assembly 500 includes a pressing cylinder 510, a driving arm 520, a connecting arm, and a pressing plate 530, the pressing cylinder 510 is fixedly disposed on the worktable 100, an output end of the pressing cylinder 510 is hinged to the driving arm 520, the driving arm 520 is hinged to the worktable 100 via the connecting arm, one end of the driving arm 520 is hinged to the output end of the pressing cylinder 510, and the other end of the driving arm 520 is fixedly connected to the pressing plate 530.
In order to determine the placement position of the cylinder body relative to the workbench 100, the present embodiment further comprises a support assembly 600, wherein the support assembly 600 comprises a plurality of fixing pins fixedly arranged on the workbench 100, and the top ends of the plurality of fixing pins are in fit connection with the bottom of the cylinder body.
Compared with the prior art: by arranging the first positioning assembly 200, the first positioning assembly 200 comprises a Y-shaped positioning part 210, one contact of the Y-shaped positioning part 210 is connected with the workbench 100, the other two contacts of the Y-shaped positioning part 210 are abutted with the crankshaft semicircular hole of the cylinder body, the top of the cylinder body can be fixed from the crankshaft semicircular hole of the cylinder body, the cylinder body can be effectively supported and prevented from shaking along the circumferential direction, meanwhile, by arranging the second positioning assembly 300, the second positioning assembly 300 comprises a positioning sleeve 310, a first driving part 320 and two sliding blocks 330 which are oppositely arranged, the positioning sleeve 310 can be arranged in the cylinder hole of the cylinder body, the two sliding blocks 330 are both in sliding connection with the positioning sleeve 310, the sliding direction of the cylinder hole is vertical to the inner wall of the cylinder hole, the first driving part 320 is fixedly connected with the positioning sleeve 310, the output end of the first driving part is connected with the two sliding blocks 330, and the first driving part is used for driving the two sliding blocks 330 to move back to abut against the inner wall of the cylinder hole, the cylinder body can be fixed from the inner wall of the cylinder hole, the movement of the cylinder body along the circumferential direction or the vertical direction can be limited through the interaction force between the sliding block 330 and the cylinder hole, furthermore, through arranging the third positioning assembly 400, the third positioning assembly 400 comprises a second driving part 410 and two clamping blocks 420, the two clamping blocks 420 are rotatably connected with the workbench 100 and form a clamping gap, the second driving part 410 is fixedly connected with the workbench 100, the output end is connected with the two clamping blocks 420, the size of the clamping gap can be adjusted to clamp the crankshaft crotch of the cylinder body, the cylinder body can be positioned from the crankshaft crotch, the movement of the cylinder body along the circumferential direction can be limited, through arranging the first positioning assembly 200, the second positioning assembly 300 and the third positioning assembly 400, the cylinder body can be limited on the workbench 100 from multiple directions and angles, when the cylinder body is suitable for a processing procedure with larger external force such as drilling and milling, the cylinder body can be effectively prevented from shaking, and the processing precision is improved.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (10)
1. The clamp for machining the cylinder body is characterized by comprising a workbench, a first positioning assembly, a second positioning assembly and a third positioning assembly;
the first positioning component comprises a Y-shaped positioning piece, one contact of the Y-shaped positioning piece is connected with the workbench, and the other two contacts of the Y-shaped positioning piece are abutted to a crankshaft semicircular hole of the cylinder body;
the second positioning assembly comprises a positioning sleeve, a first driving piece and two sliding blocks which are oppositely arranged, the positioning sleeve can be arranged in a cylinder hole of the cylinder body, the two sliding blocks are connected with the positioning sleeve in a sliding mode, the sliding direction of the two sliding blocks is perpendicular to the inner wall of the cylinder hole, the first driving piece is fixedly connected with the positioning sleeve, the output end of the first driving piece is connected with the two sliding blocks, and the first driving piece is used for driving the two sliding blocks to move back to abut against the inner wall of the cylinder hole;
the third locating component comprises a second driving piece and two clamping blocks, the two clamping blocks are connected with the workbench in a rotating mode and form a clamping gap, the second driving piece is fixedly connected with the workbench, the output end of the second driving piece is connected with the two clamping blocks, and the clamping gap can be adjusted to be used for clamping the crankshaft crotch of the cylinder body.
2. The clamp for cylinder processing according to claim 1, wherein the Y-shaped positioning member includes a fixed block and two support pins, the bottom of the fixed block is detachably connected to the worktable, the two support pins are oppositely disposed on the top of the fixed block, the two support pins are oppositely disposed in an inclined manner and form a Y-shaped structure with the fixed block, and the top ends of the two support pins are abutted to the arc-shaped surface of the crankshaft semicircular hole.
3. The cylinder block machining jig according to claim 1, wherein a bottom portion of the positioning sleeve is detachably connected to the table via the first driving member.
4. The fixture for machining the cylinder body according to claim 1, wherein the first driving piece comprises a first oil cylinder and a first wedge block, the first oil cylinder is detachably arranged on the workbench, an output end of the first oil cylinder is connected with the first wedge block and used for driving the first wedge block to move in the vertical direction, a wedge surface of the first wedge block is in sliding abutting joint with the two sliding blocks, and the positioning sleeve is placed on the first oil cylinder.
5. The clamp for machining the cylinder body according to claim 1, wherein the second driving member comprises a second oil cylinder and a second wedge-shaped block, the second oil cylinder is detachably arranged on the workbench, an output end of the second oil cylinder is connected with the second wedge-shaped block, and a wedge surface of the second wedge-shaped block is in sliding butt joint with the two clamping blocks.
6. The jig for cylinder block machining according to claim 5, wherein a positioning pin is fixedly connected to each of opposite sides of the two clamping blocks, and the two positioning pins form the clamping gap therebetween for clamping the crankshaft crotch of the cylinder block.
7. The clamp for machining a cylinder block according to claim 6, wherein an abutting pin is fixedly connected to each of opposite sides of the two clamping blocks, and each of the two abutting pins is in sliding abutment with the wedge surface of the second wedge block.
8. The clamp for machining a cylinder block of claim 1, further comprising a pressing assembly, wherein the pressing assembly is fixedly connected to the worktable and has a pressing end, and a pressing gap for clamping the cylinder block is formed between the pressing end and the worktable.
9. The clamp for cylinder body processing according to claim 8, wherein the pressing assembly includes a pressing cylinder, a driving arm, a connecting arm, and a pressing plate, the pressing cylinder is fixedly disposed on the worktable, an output end of the pressing cylinder is hinged to the driving arm, the driving arm is hinged to the worktable via the connecting arm, one end of the driving arm is hinged to the output end of the pressing cylinder, and the other end of the driving arm is fixedly connected to the pressing plate.
10. The jig for cylinder block machining according to claim 1, further comprising a support assembly including a plurality of fixing pins fixedly provided on the table, wherein top ends of the plurality of fixing pins are fittingly connected to a bottom of the cylinder block.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222368799.2U CN218363504U (en) | 2022-09-05 | 2022-09-05 | Clamp for cylinder body machining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222368799.2U CN218363504U (en) | 2022-09-05 | 2022-09-05 | Clamp for cylinder body machining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218363504U true CN218363504U (en) | 2023-01-24 |
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ID=84971945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222368799.2U Active CN218363504U (en) | 2022-09-05 | 2022-09-05 | Clamp for cylinder body machining |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218363504U (en) |
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2022
- 2022-09-05 CN CN202222368799.2U patent/CN218363504U/en active Active
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