CN220271039U - Pavement material strength tester - Google Patents
Pavement material strength tester Download PDFInfo
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- CN220271039U CN220271039U CN202321978674.XU CN202321978674U CN220271039U CN 220271039 U CN220271039 U CN 220271039U CN 202321978674 U CN202321978674 U CN 202321978674U CN 220271039 U CN220271039 U CN 220271039U
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- 238000012360 testing method Methods 0.000 claims abstract description 28
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 abstract description 4
- 230000001681 protective effect Effects 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The application discloses pavement material strength test appearance belongs to pavement material test instrument technical field, it includes the tester body, the top surface of tester body is provided with the stand, the stand overhead has the roof, the bottom surface of roof is provided with the dead lever, the bottom of dead lever is provided with pressure test table, the bottom of pressure test table is provided with the pressure disk, the cavity has been seted up to the inside cavity of tester body, the through-hole has been seted up to the interior top surface of cavity, the interior bottom surface of cavity is provided with the cylinder, the top of cylinder piston rod is fixed with the loading disc, the loading disc passes the through-hole, the week side of loading disc is provided with the guard frame, be provided with the push pedal in the guard frame, the bottom surface of push pedal is laminated with the top surface of tester body mutually, be provided with the actuating mechanism who is used for driving the push pedal to remove along tester body length direction on the guard frame. The pavement material cleaning device has the advantage that pavement materials broken on the tester body are convenient to clean.
Description
Technical Field
The application relates to the field of pavement material testing instruments, in particular to a pavement material strength tester.
Background
Along with the development of society, the traffic roads in China develop rapidly, so that the quality requirements on the roads are higher and higher, the strength of the road surface materials is required to be detected, so that the strength requirements of the road surface materials are ensured, and the road surface material strength tester is an instrument which is frequently used in the detection of the strength of the road surface materials.
The utility model discloses a road surface material intensity tester as in chinese patent with bulletin number CN219265888U, including the tester body, the stand that the symmetry set up is passed through at the top of tester body is connected with the roof, the bottom of roof sets up and is connected with pressure sensor and cross-section and is the clamp plate of trapezoidal form through the dead lever, the tester body is connected with the test plate through being rectangular form's lifter, one side of test plate is provided with adjustment mechanism, be provided with cleaning mechanism on the stand on tester body right side, adjustment mechanism is including the regulation pole that is "L" form, the screw groove has been seted up to one side of test plate, the regulation pole is close to the one end outer wall of test plate and is provided with the external screw thread, regulation pole and screw groove threaded connection, the top rotation of regulation pole is connected with the adjustment handle that is "L" form, fixedly connected with magnet on the adjustment handle, one side fixedly connected with that the magnet is close to the test plate is the first spring of slope form, the bottom and regulation pole fixedly connected with of first spring, cleaning mechanism includes the telescopic link with one of being one of stand outer wall fixedly connected with of one of them, the telescopic link is close to the one end fixedly connected with magnet plate, the bottom fixedly connected with of magnet is evenly distributed's cleaning post, be equipped with on the telescopic link, second stand is equipped with the second and the second end fixedly connected with the second stand with collection box of spring, the second stand is connected with the other end of the second spring, the second stand is fixedly connected with the top with the second spring.
In the above-mentioned related art, because the test board and the clamp plate extrude the pavement material, make pavement material extrusion broken, the pavement material of extrusion broken not only can fall on the test board, still can fall everywhere on the tester body to be inconvenient for the staff to clear up broken pavement material on the tester body.
Disclosure of Invention
In order to solve the problem that the staff is inconvenient to clear up the pavement material on the tester body, the application provides a pavement material strength tester.
The application provides a pavement material intensity tester adopts following technical scheme:
the utility model provides a pavement material intensity test appearance, includes the tester body, the top surface of tester body is provided with the stand, the stand overhead has the roof, the bottom surface of roof is provided with the dead lever, the bottom of dead lever is provided with pressure test table, pressure test table's bottom is provided with the pressure disk, the cavity has been seted up to the inside cavity of tester body, the through-hole has been seted up to the interior top surface of cavity, the interior bottom surface of cavity is provided with the cylinder, the top of cylinder piston rod is fixed with the loading disc, the loading disc passes the through-hole, the week side of loading disc is provided with the protection frame, be provided with the push pedal in the protection frame, the bottom surface of push pedal with the top surface of tester body is laminated mutually, be provided with on the protection frame and be used for the drive the push pedal is followed the actuating mechanism that tester body length direction removed.
Through adopting above-mentioned technical scheme, place road surface material on the loading tray, start the cylinder, the piston rod drive loading tray of cylinder upwards moves, makes the loading tray drive road surface material upwards move, makes the top surface of road surface material and the bottom surface butt of pressure disk, and the loading tray continues to upwards move to road surface material extrusion breakage to accomplish the intensity test to road surface material. Then start the cylinder, make the piston rod of cylinder drive the loading tray and move downwards, make the top surface of loading tray and the top surface coplane of tester body, then through actuating mechanism drive push pedal removal, make the push pedal push away broken road surface side material on the tester body to one side of tester body to the staff of being convenient for clear up broken road surface material on the tester body.
Preferably, the protection frame comprises a first side plate and a second side plate which are arranged in parallel, a third side plate is fixed between the first side plate and the second side plate, a fourth side plate is hinged to one end, away from the third side plate, of the first side plate, and a fixing assembly is detachably connected with the fourth side plate.
Through adopting above-mentioned technical scheme, with curb plate IV and curb plate one articulated, when the push pedal pushes away broken road surface material on with the tester body to be close to one side of curb plate IV to be convenient for open curb plate IV, clear up broken road surface material, also be convenient for simultaneously place the road surface material that awaits measuring on the loading disc.
Preferably, the driving mechanism comprises a screw rod fixed on two sides of the side face of the bearing disc, the screw rod is far away from one end of the push plate and penetrates through the side plate III, the screw rod is in sliding connection with the side plate III, the side plate III is far away from two sides of the side face of the bearing disc and is provided with driving pipes in a rotating mode, the two screw rods penetrate through the two driving pipes respectively, the screw rod is in threaded connection with the driving pipes, and a driving assembly used for driving the two driving pipes to rotate simultaneously is arranged on the side plate III.
Through adopting above-mentioned technical scheme, through two actuating tubes of actuating assembly simultaneous drive rotation, the actuating tube drive screw moves towards the direction that is close to curb plate four, and the screw rod drives the push pedal and moves towards the direction that is close to curb plate four to be convenient for the push pedal push the broken road surface material on the tester body to one side of tester body top surface, the staff of being convenient for clear up.
Preferably, the driving assembly comprises a motor fixed on the side surface of the bearing disc, which is far away from the side surface of the bearing disc, a driving belt wheel is arranged on an output shaft of the motor, driven belt wheels are arranged on two driving pipes, and a driving belt is wound on the outer peripheral surface of the driving belt wheel and the outer peripheral surfaces of the driven belt wheels respectively.
Through adopting above-mentioned technical scheme, start the motor, the motor drives the driving pulley and rotates, and the driving pulley drives two drive belts simultaneously and rotates to make two drive belts drive two drive tubes simultaneously and rotate.
Preferably, the tester body is far away from the side surface of the side plate III, a through hole is formed in the inner top surface of the mounting groove, the through hole is positioned between the side plate IV and the bearing plate, and a receiving box is arranged in the mounting groove in a sliding manner.
Through adopting above-mentioned technical scheme, when the push pedal promotes broken road surface material on with the tester body towards the direction that is close to curb plate four, makes broken road surface material propelling movement to opening department, and broken road surface material drops to the material receiving box through the opening in to be convenient for collect the clearance to broken road surface material.
Preferably, the second side plate is close to the fourth side plate, the fourth side plate is close to the second side plate, the sliding groove is formed in the end face of the second side plate, the fixing assembly comprises a clamping block which is arranged in the sliding groove in a sliding mode, one end of the clamping block can be inserted into the clamping groove, the sliding groove is far away from the third side plate, a through groove is formed in the inner side surface of the third side plate, the clamping block is far away from the third side plate, a moving block is fixed on the side surface of the third side plate, and one end of the moving block, far away from the third side plate, penetrates through the through groove.
Through adopting above-mentioned technical scheme, when placing the road surface material that awaits measuring on the loading tray, rotate the direction that is close to curb plate two with curb plate four orientation, make the draw-in groove aim at the draw-in groove, move the movable block towards the direction that is close to curb plate two, the movable block drives the fixture block and moves towards the direction that is close to curb plate two, makes the one end of fixture block insert and locates in the draw-in groove to with curb plate two and four fixed connection of curb plate.
Preferably, a spring is fixed on the end surface of the clamping block far away from the second side plate, and one end of the spring far away from the clamping block is fixed on the inner side surface of the sliding groove far away from the second side plate.
Through adopting above-mentioned technical scheme, rotate the direction that is close to curb plate two with curb plate four orientation, make the sliding tray be close to the draw-in groove, the fixture block removes towards the direction that is close to curb plate two under the spring action of spring, makes the fixture block keep away from the one end of spring insert establish with in the draw-in groove to reduce the possibility that the fixture block breaks away from the draw-in groove.
Preferably, a limiting block is fixed on the side surface of the second side plate, which is close to the first side plate, and the side surface of the limiting block, which is far away from the third side plate, can be abutted with the side surface of the fourth side plate, which is close to the third side plate.
Through adopting above-mentioned technical scheme, when rotating the direction that is close to curb plate two with curb plate four orientation, make the side that curb plate four is close to curb plate three and the side looks away from curb plate three with the stopper looks away from the side looks butt of curb plate three to make the draw-in groove aim at the draw-in groove, the fixture block of being convenient for inserts and locates in the draw-in groove.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the method comprises the steps that pavement materials are placed on a bearing disc, an air cylinder is started, a piston rod of the air cylinder drives the bearing disc to move upwards, the bearing disc drives the pavement materials to move upwards, the top surface of the pavement materials are abutted to the bottom surface of a pressure disc, and the bearing disc continues to move upwards until the pavement materials are extruded and crushed, so that the strength test of the pavement materials is completed. Then, starting the air cylinder to enable a piston rod of the air cylinder to drive the bearing disc to move downwards, enabling the top surface of the bearing disc to be coplanar with the top surface of the tester body, and then driving the pushing plate to move through the driving mechanism, so that the pushing plate pushes broken pavement side materials on the tester body to one side of the tester body, and a worker can conveniently clean broken pavement materials on the tester body;
2. the side plate IV is hinged with the side plate I, when the pushing plate pushes the broken pavement material on the tester body to one side close to the side plate IV, the side plate IV is conveniently opened, the broken pavement material is conveniently cleaned, and meanwhile, the pavement material to be tested is conveniently placed on the bearing disc;
3. when the push plate pushes the broken pavement material on the tester body towards the direction close to the side plate IV, the broken pavement material is pushed to the through hole, and falls into the material receiving box through the through hole, so that the broken pavement material is convenient to collect and clean.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a pavement material strength tester according to an embodiment of the present application.
FIG. 2 is a cross-sectional view of a tester body in an embodiment of the present application.
Fig. 3 is an enlarged schematic view at a in fig. 2.
Fig. 4 is a cross-sectional view of a protective frame in an embodiment of the present application.
Reference numerals: 1. a tester body; 11. a column; 12. a top plate; 13. a fixed rod; 14. a pressure test meter; 15. a pressure plate; 2. a cavity; 21. a cylinder; 22. a through hole; 23. a carrying tray; 3. a protective frame; 31. a first side plate; 32. a second side plate; 33. a side plate III; 34. a side plate IV; 4. a sliding groove; 41. a clamping block; 42. a spring; 43. a through groove; 44. a moving block; 45. a clamping groove; 46. a limiting block; 5. a push plate; 51. a slide block; 52. a chute; 53. a screw; 54. a driving tube; 55. a motor; 56. a driving pulley; 57. a driven pulley; 58. a transmission belt; 6. a mounting groove; 61. a through port; 62. and receiving a material box.
Detailed Description
The present application is described in further detail below in conjunction with figures 1-4.
The embodiment of the application discloses a pavement material strength tester.
Referring to fig. 1 and 2, a pavement material strength tester includes a tester body 1, two sides of a top surface of the tester body 1 are both fixed with columns 11, a top plate 12 is disposed above the two columns 11, and a bottom surface of the top plate 12 is fixedly connected with the top surfaces of the two columns 11. The bottom surface of roof 12 is fixed with dead lever 13, and the bottom of dead lever 13 is fixed with pressure test table 14, and the bottom mounting of pressure test table 14 has pressure disk 15. The tester body 1 is internally provided with a cavity 2, the inner bottom surface of the cavity 2 is fixedly provided with a cylinder 21, the inner top surface of the cavity 2 is provided with a through hole 22, the top end of a piston rod of the cylinder 21 is fixedly provided with a bearing disc 23, the top end of the bearing disc 23 penetrates through the through hole 22, and the outer peripheral surface of the bearing disc 23 is attached to the inner peripheral surface of the through hole 22.
When the intensity test is needed to be carried out on the pavement material, the pavement material is placed on the bearing disc 23, the air cylinder 21 is started, the piston rod of the air cylinder 21 pushes the bearing disc 23 to move upwards, the top surface of the pavement material is abutted to the bottom surface of the pressure disc 15, the piston rod of the air cylinder 21 continues to push the bearing disc 23 to move upwards, the pavement material is extruded and crushed, and then the staff records the data on the pressure test meter 14, so that the intensity test of the pavement material is completed.
Referring to fig. 1 and 2, a protective frame 3 is disposed on the peripheral side of the carrying tray 23, the protective frame 3 includes two side plates 31 and 32 disposed parallel to each other, and the bottom surface of the side plate 31 and the bottom surface of the side plate 32 are both fixed on the top surface of the tester body 1. A side plate III 33 is fixed between the side plate I31 and the side plate II 32, one side surface of the side plate III 33 is coplanar with one end surface of the side plate I31 and one end surface of the side plate II 32 respectively, and the bottom surface of the side plate III 33 is fixed on the top surface of the tester body 1. One end of the first side plate 31, which is far away from the third side plate 33, is hinged with a fourth side plate 34, and the fourth side plate 34 is positioned between the first side plate 31 and the second side plate 32.
Referring to fig. 2 and 3, a sliding groove 4 is formed in an end surface of the side plate four 34, which is close to the side plate two 32, a clamping block 41 is slidably arranged in the sliding groove 4, a clamping groove 45 is formed in a side surface of the side plate two 32, which is close to the side plate four 34, and one end of the clamping block 41 can be inserted into the clamping groove 45. The end face of the clamping block 41, which is far away from the second side plate 32, is fixed with a spring 42, and one end of the spring 42, which is far away from the second side plate 32, is fixed on the inner side face of the sliding groove 4, which is far away from the second side plate 32. The inner side surface of the sliding groove 4 far away from the side plate III 33 is provided with a through groove 43, the side surface of the clamping block 41 far away from the side plate III 33 is fixedly provided with a moving block 44, and one end of the moving block 44 far away from the clamping block 41 penetrates through the through groove 43. The side surface of the second side plate 32, which is close to the first side plate 31, is fixed with a limiting block 46, and the side surface of the fourth side plate 34, which is close to the third side plate 33, can be abutted against the side surface of the limiting block 46, which is far away from the third side plate 33.
The pavement material to be subjected to the strength test is placed on the bearing disc 23, the moving block 44 is pushed towards the direction approaching to the first side plate 31, the moving block 44 drives the clamping block 41 to move towards the direction approaching to the first side plate 31, the clamping block 41 is moved into the sliding groove 4, the spring 42 is in a compressed state, the fourth side plate 34 is rotated towards the direction approaching to the second side plate 32, the side surface of the fourth side plate 34 approaching to the third side plate 33 is abutted against the side surface of the limiting block 46 away from the third side plate 33, the sliding groove 4 is aligned with the clamping groove 45, the moving block 44 is loosened, the clamping block 41 moves towards the direction approaching to the second side plate 32 under the action of the elasticity of the spring 42, and one end of the clamping block 41 away from the spring 42 is inserted into the clamping groove 45, so that the fourth side plate 34 is fixedly connected with the second side plate 32, and broken pavement material is conveniently concentrated in the protective frame 3 when the strength test is performed on the pavement material.
Referring to fig. 2 and 4, a push plate 5 is disposed between the first side plate 31 and the second side plate 32, and the bottom surface of the push plate 5 is attached to the top surface of the tester body 1. The sliding blocks 51 are fixed on the two end faces of the push plate 5, sliding grooves 52 are formed in the side faces, close to each other, of the first side plate 31 and the second side plate 32, and the sliding blocks 51 are arranged in the sliding grooves 52 in a sliding mode. Screw rods 53 are fixed on two sides of the side surface of the push plate 5 away from the side plate IV 34, one end of the screw rod 53 away from the push plate 5 penetrates through the side plate III 33, and the two screw rods 53 are respectively connected with the side plate III 33 in a sliding mode. The side plates three 33 are respectively provided with driving pipes 54 in a rotating way on two sides of the side surface far away from the push plate 5, one ends of the two screw rods 53 far away from the push plate 5 respectively penetrate through the two driving pipes 54, and the screw rods 53 are in threaded connection with the driving pipes 54.
Referring to fig. 2 and 4, a motor 55 is fixed to the side surface of the third side plate 33, which is far from the push plate 5, a driving pulley 56 is arranged on the output shaft of the motor 55, driven pulleys 57 are respectively sleeved and fixed on the outer peripheral surfaces of the two rotating tubes, and a driving belt 58 is wound around the outer peripheral surfaces of the driving pulley 56 and the two driven pulleys 57 respectively. The side of the tester body 1 far away from the side plate III 33 is provided with a mounting groove 6, a receiving box 62 is slidably mounted in the mounting groove 6, the inner top surface of the mounting groove 6 is provided with a through hole 61, and the through hole 61 is positioned between the side plate IV 34 and the bearing disc 23.
The implementation principle of the pavement material strength tester of the embodiment of the application is as follows: when the pavement material strength test is finished, the air cylinder 21 is started, and the piston rod of the air cylinder 21 drives the bearing disc 23 to move downwards, so that the top surface of the bearing disc 23 and the top surface of the tester body 1 are coplanar. Then, the motor 55 is started, the output shaft of the motor 55 drives the driving belt pulley 56 to rotate, the driving belt pulley 56 drives the two driving belt belts 58 to rotate respectively, the two driving belt belts 58 drive the two driven belt pulleys 57 to rotate respectively, the two driven belt pulleys 57 drive the two driving pipes 54 to rotate respectively, the driving pipes 54 drive the screw 53 to move towards the direction close to the side plate IV 34, the screw 53 drives the push plate 5 to move towards the direction close to the side plate IV 34, the push plate 5 pushes the pavement materials broken on the top surface of the tester body 1 to the through hole 61, the materials broken on the top surface of the tester body 1 drop into the material receiving box 62 through the through hole 61, and therefore workers can conveniently and intensively clean the pavement materials broken on the top surface of the tester body 1.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (8)
1. The utility model provides a pavement material intensity test appearance, includes tester body (1), the top surface of tester body (1) is provided with stand (11), stand (11) overhead has roof (12), the bottom surface of roof (12) is provided with dead lever (13), the bottom of dead lever (13) is provided with pressure test table (14), the bottom of pressure test table (14) is provided with pressure disk (15), its characterized in that: the utility model discloses a tester, including tester body (1), through-hole (22) have been seted up to inside cavity (2), interior bottom surface of cavity (2) is provided with cylinder (21), the top of cylinder (21) piston rod is fixed with and bears dish (23), bear dish (23) and pass through-hole (22), the week side of bearing dish (23) is provided with protection frame (3), be provided with push pedal (5) in protection frame (3), the bottom surface of push pedal (5) with the top surface of tester body (1) is laminated mutually, be provided with on protection frame (3) and be used for the drive push pedal (5) are followed the actuating mechanism that tester body (1) length direction removed.
2. The pavement material strength tester according to claim 1, wherein: the protection frame (3) comprises a first side plate (31) and a second side plate (32) which are arranged in parallel, a third side plate (33) is fixed between the first side plate (31) and the second side plate (32), one end, away from the third side plate (33), of the first side plate (31) is hinged with a fourth side plate (34), and the second side plate (32) is provided with a fixing component which is detachably connected with the fourth side plate (34).
3. A pavement material strength tester according to claim 2, wherein: the driving mechanism comprises a screw rod (53) which is fixed on two sides of the side face of the bearing disc (23) away from the push plate (5), one end of the screw rod (53) which is far away from the push plate (5) penetrates through the side plate III (33), the screw rod (53) is in sliding connection with the side plate III (33), the side plate III (33) is far away from the two sides of the side face of the bearing disc (23) and is provided with driving pipes (54) in a rotating mode, the two screw rods (53) penetrate through the two driving pipes (54) respectively, the screw rods (53) are in threaded connection with the driving pipes (54), and driving components which are used for driving the two driving pipes (54) to rotate simultaneously are arranged on the side plate III (33).
4. A pavement material strength tester according to claim 3, wherein: the driving assembly comprises a motor (55) fixed on the side surface of the bearing disc (23), wherein the side plate III (33) is far away from the side surface of the bearing disc (23), a driving belt wheel (56) is arranged on an output shaft of the motor (55), driven belt wheels (57) are arranged on two driving pipes (54), and a driving belt (58) is wound on the peripheral surface of the driving belt wheel (56) and the peripheral surfaces of the driven belt wheels (57) respectively.
5. A pavement material strength tester according to claim 3, wherein: the tester is characterized in that the side surface of the tester body (1) away from the side plate III (33) is provided with a mounting groove (6), the inner top surface of the mounting groove (6) is provided with a through hole (61), the through hole (61) is positioned between the side plate IV (34) and the bearing disc (23), and a receiving box (62) is arranged in the mounting groove (6) in a sliding manner.
6. A pavement material strength tester according to claim 2, wherein: the side board II (32) is close to draw-in groove (45) have been seted up to the side of curb plate IV (34), curb plate IV (34) are close to sliding tray (4) have been seted up to the terminal surface of curb plate II (32), fixed subassembly including slide set up in fixture block (41) in sliding tray (4), the one end of fixture block (41) can insert set up with in draw-in groove (45), sliding tray (4) keep away from logical groove (43) have been seted up to the medial surface of curb plate III (33), fixture block (41) keep away from the side of curb plate III (33) is fixed with movable block (44), movable block (44) keep away from one end of curb plate III (33) is passed logical groove (43).
7. The pavement material strength tester according to claim 6, wherein: the end face, far away from the second side plate (32), of the clamping block (41) is fixedly provided with a spring (42), and one end, far away from the clamping block (41), of the spring (42) is fixed on the inner side face, far away from the second side plate (32), of the sliding groove (4).
8. The pavement material strength tester according to claim 6, wherein: a limiting block (46) is fixed on the side surface of the second side plate (32) close to the first side plate (31), and the side surface of the limiting block (46) away from the third side plate (33) can be abutted with the side surface of the fourth side plate (34) close to the third side plate (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321978674.XU CN220271039U (en) | 2023-07-25 | 2023-07-25 | Pavement material strength tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321978674.XU CN220271039U (en) | 2023-07-25 | 2023-07-25 | Pavement material strength tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220271039U true CN220271039U (en) | 2023-12-29 |
Family
ID=89302189
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321978674.XU Active CN220271039U (en) | 2023-07-25 | 2023-07-25 | Pavement material strength tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220271039U (en) |
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2023
- 2023-07-25 CN CN202321978674.XU patent/CN220271039U/en active Active
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