Test fixture for automobile control panel production

Abstract

The invention relates to the technical field of automobile testing, in particular to a testing clamp for automobile control panel production, which comprises a testing seat, a mounting groove is formed in the top of the testing seat, and horizontal transverse sliding plates are slidably mounted at the positions, close to the top end, of the two ends of the mounting groove in a penetrating manner; a vertical sliding plate is slidably installed at the position, close to the inner end, of the transverse sliding plate in a penetrating mode. The device has the beneficial effects that the side toothed plates are in driving connection with the transverse sliding plate, the middle toothed plate is in driving connection with the vertical sliding plate, and the top ends of the side toothed plates are higher than the top end of the middle toothed plate, so that after the control panel is placed into the mounting groove, the control panel firstly presses the side toothed plates downwards, the inner end of the transverse sliding plate is driven to move to the position above the control panel, and then the control panel is driven to rotate; and then the middle toothed plate is pressed downwards, the bottom end of the vertical sliding plate is driven to abut against the control panel, the control panel can be automatically clamped and fixed through the arrangement, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive testing, and particularly relates to a test fixture for the production of automotive control panels. Background Art

[0002] With the continuous development of automotive electronic technology, as an important carrier for vehicle internal operations and information interaction, the functions and complexity of automotive control panels are increasing day by day. In order to ensure that automotive control panels can meet the design requirements and usage needs during the production process, a series of functional tests and performance detections are usually required. In this process, the test fixture, as a key auxiliary device, is used to stably fix the automotive control panel on the test seat for relevant tests.

[0003] Currently, during the testing process of automotive control panels, most test fixtures use manual operation methods to clamp and fix the control panels. This manual clamping method not only has low efficiency, but also easily causes uneven clamping force or inaccurate clamping position due to improper human operation, thus affecting the accuracy of test results. In addition, manual clamping may also cause surface scratches or other mechanical damages to the product, reducing the yield rate of the product.

[0004] Therefore, a test fixture for the production of automotive control panels is needed to solve the above problems. Summary of the Invention

[0005] In order to solve the above problems, that is, to solve the problem that the existing fixture cannot automatically clamp and fix the control panel, the present invention provides a test fixture for the production of automotive control panels.

[0006] A test fixture for the production of automotive control panels includes a test seat. An installation groove is provided at the top of the test seat. Horizontal cross sliders are slidably installed through both ends of the installation groove near the top. A vertical vertical slider is slidably installed through a position near the inner end of the cross slider. Side tooth plates and middle tooth plates are slidably installed near both ends inside the installation groove. The top of the side tooth plate is higher than the top of the middle tooth plate. The side tooth plate is drivingly connected to the cross slider, and the middle tooth plate is drivingly connected to the vertical slider. By drivingly connecting the side tooth plate to the cross slider, drivingly connecting the middle tooth plate to the vertical slider, and making the top of the side tooth plate higher than the top of the middle tooth plate, after the control panel is placed in the installation groove, the control panel will first press down the side tooth plate, driving the inner end of the cross slider to move above the control panel, and then press down the middle tooth plate, driving the bottom end of the vertical slider to abut against the control panel. This setting can automatically clamp and fix the control panel, improving work efficiency.

[0007] Preferably, a fifth retraction cavity is formed at the top end of the vertical slide plate. A spring rod is slidably installed inside the fifth retraction cavity. The bottom end of the spring rod is connected to the bottom end of the fifth retraction cavity through a sixth abutting spring. The top end of the spring rod extends above the vertical slide plate and is fixedly connected to the top plate. The lower surface of the top plate is connected to the upper surface of the horizontal slide plate through a first abutting spring. By slidably installing the vertical slide plate at the bottom of the top plate, when the top plate is pulled down to drive the vertical slide plate to slide down, when the bottom end of the vertical slide plate abuts against the control panel, it does not affect the continuous downward sliding of the top plate, so that it does not affect the continuous downward sliding of the intermediate toothed plate, enabling the device to be applicable to control panels of various thicknesses.

[0008] Preferably, steps are fixedly installed at the bottoms of both ends of the installation groove. A second retraction cavity is formed at the middle position of the top of the step. The intermediate toothed plate is slidably installed inside the second retraction cavity through a third abutting spring. The top end of the intermediate toothed plate extends outside the second retraction cavity. The setting of the steps can prevent the electrical components at the bottom of the control panel from being damaged.

[0009] Preferably, a linkage cavity is formed inside the horizontal slide plate. A second linkage shaft is rotatably installed inside the linkage cavity. A first pull rope is fixedly installed on the lower surface of the top plate. The bottom end of the first pull rope extends into the linkage cavity and is fixedly connected to the second linkage shaft. A communication sliding hole is formed through the bottom of the linkage cavity.

[0010] Preferably, a sliding sleeve is slidably installed on the outer surface of the second linkage shaft. A limiting sliding groove is formed on the outer surface of the second linkage shaft. A limiting sliding block is fixedly installed on the inner surface of the sliding sleeve. The limiting sliding block slides inside the limiting sliding groove. A holding ring is rotatably installed on the outer surface of the sliding sleeve. A fixing rod is fixedly installed on the outer surface of the holding ring. The bottom end of the fixing rod passes through the communication sliding hole and is fixedly connected to the test seat. A gear shaft is rotatably installed inside the test seat. A second gear is coaxially fixedly installed at one end of the gear shaft. The second gear is meshed with the intermediate toothed plate. A second pull rope is wound around the outer surface of the sliding sleeve. The bottom end of the second pull rope is fixedly connected to the outer surface of the gear shaft. By providing the second linkage shaft and the sliding sleeve sliding on the second linkage shaft, even when the horizontal slide plate slides, the intermediate toothed plate can still pull the top plate and the vertical slide plate to slide down when sliding down.

[0011] Preferably, a driving tooth groove is formed on the lower surface of the cross slide plate. A third gear is rotatably installed inside the test base. The third gear is meshed and connected with the driving tooth groove. One end of the third gear is coaxially and fixedly installed with a fourth bevel gear. A first linkage shaft is rotatably installed inside the test base. The top end and the bottom end of the first linkage shaft are respectively coaxially and fixedly installed with a third bevel gear and a second bevel gear. The third bevel gear is meshed and connected with the fourth bevel gear. A torsion spring shaft is rotatably installed inside the test base. The two ends of the torsion spring shaft are respectively coaxially and fixedly installed with a first bevel gear and a first gear. The first bevel gear is meshed and connected with the second bevel gear.

[0012] Preferably, first retraction cavities are respectively formed at positions close to both ends on the upper surface of the step. A portal frame is slidably installed in the first retraction cavity through a second abutting spring. The horizontal section of the portal frame is located above the intermediate tooth plate. The side tooth plate is integrally installed at a position close to the bottom inside one of the vertical sections of the portal frame. The first gear is meshed and connected with the side tooth plate; when the control panel presses the portal frame, the side tooth plate drives the cross slide plate to slide inwards. By arranging the torsion spring shaft, when the cross slide plate abuts against the side of the control meter plate, the portal frame can still slide down. At this time, the torsion spring shaft starts to wind up. After the upper surface of the control panel passes over the cross slide plate, the torsion spring shaft relaxes, and the inner end of the cross slide plate slides to the upper side of the control panel.

[0013] Preferably, a reset shaft is rotatably installed in the bottom wall of the test base. One end of the reset shaft extends out of the test base. Oblique tooth grooves are respectively formed at positions close to the top on the outer side of the portal frame and on one side of the intermediate tooth plate. Three third retraction cavities are formed inside one of the steps. The three third retraction cavities are respectively located on both sides of the portal frame and on the side of the intermediate tooth plate. An oblique tooth block is slidably installed in the third retraction cavity through a fourth abutting spring. A rope passing hole is formed at the outer end of the third retraction cavity. The other end of the rope passing hole is communicated with the reset shaft. The outer end of the oblique tooth block is connected with the reset shaft through a third pulling rope; when the portal frame and the intermediate tooth plate both slide to the bottommost position, the oblique tooth block will be stuck in the oblique tooth groove to prevent the portal frame and the intermediate tooth plate from sliding upwards. When the portal frame and the intermediate tooth plate need to be reset, rotate the reset shaft, and pull the oblique tooth block out of the oblique tooth groove through the third pulling rope.

[0014] The beneficial effects of the present invention are as follows: 1. In the present invention, by drivingly connecting the side tooth plate to the cross slide plate and the middle tooth plate to the vertical slide plate, and making the top end of the side tooth plate higher than the top end of the middle tooth plate, after the control panel is placed in the installation groove, the control panel will first press down the side tooth plate, driving the inner end of the cross slide plate to move above the control panel, and then press down the middle tooth plate, driving the bottom end of the vertical slide plate to abut against the control panel. This setting can automatically clamp and fix the control panel, improving work efficiency.

[0015] 2. In the present invention, by slidably mounting the vertical slide plate at the bottom of the top plate, when the top plate is pulled down to drive the vertical slide plate to slide down, when the bottom end of the vertical slide plate abuts against the control panel, it does not affect the top plate to continue sliding down, thus not affecting the middle tooth plate to continue sliding down, enabling the device to be applicable to control panels of various thicknesses.

[0016] 3. In the present invention, by providing a second linkage shaft and a sliding sleeve sliding on the second linkage shaft, even if the cross slide plate slides, the middle tooth plate can still pull the top plate and the vertical slide plate to slide down when sliding down. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the external structure of the present invention; Figure 2 is a schematic diagram of the side tooth plate structure of the present invention; Figure 3 is a schematic cross-sectional view of the vertical slide plate of the present invention; Figure 4 is a schematic diagram of the middle tooth plate structure of the present invention; Figure 5 is a schematic cross-sectional view of the second linkage shaft of the present invention; Figure 6 is a schematic cross-sectional view of the step of the present invention; Figure 7 is of the present invention Figure 6 the enlarged structure schematic diagram at A in; Figure 8 is a schematic diagram of the bottom structure of the cross slide plate of the present invention.

[0018] In the figure: 1. Test base; 2. Installation groove; 3. Horizontal slide plate; 4. Vertical slide plate; 5. Side tooth plate; 6. Intermediate tooth plate; 7. Fifth retraction cavity; 8. Spring rod; 9. Sixth abutting spring; 10. Top plate; 11. First abutting spring; 12. Step; 13. Second retraction cavity; 14. Third abutting spring; 15. Linkage cavity; 16. Second linkage shaft; 17. First pulling rope; 18. Connecting slide hole; 19. Slide sleeve; 20. Limit slide groove; 21. Limit slider; 22. Holding ring; 23. Fixed rod; 24. Gear shaft; 25. Second gear; 26. Second pulling rope; 27. Driving tooth groove; 28. Third gear; 29. Fourth bevel gear; 30. First linkage shaft; 31. Third bevel gear; 32. Second bevel gear; 33. Torsion spring shaft; 34. First bevel gear; 35. First gear; 36. First retraction cavity; 37. Second abutting spring; 38. Gantry; 39. Reset shaft; 40. Helical tooth groove; 41. Third retraction cavity; 42. Fourth abutting spring; 43. Helical tooth block; 44. Rope passing hole; 45. Third pulling rope. Detailed implementation manners

[0019] The preferred implementation manners of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these implementation manners are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0020] As Figure 1 shown, an embodiment of the present invention discloses a test fixture for the production of an automotive control panel, including a test base 1. An installation groove 2 is opened at the top of the test base 1. Horizontal slide plates 3 are slidably installed through both ends of the installation groove 2 near the top. A vertical slide plate 4 is slidably installed through the inner end of the horizontal slide plate 3. Side tooth plates 5 and intermediate tooth plates 6 are slidably installed near both ends inside the installation groove 2. The top end of the side tooth plate 5 is higher than the top end of the intermediate tooth plate 6. The side tooth plate 5 is drivingly connected to the horizontal slide plate 3, and the intermediate tooth plate 6 is drivingly connected to the vertical slide plate 4. By drivingly connecting the side tooth plate 5 to the horizontal slide plate 3, drivingly connecting the intermediate tooth plate 6 to the vertical slide plate 4, and making the top end of the side tooth plate 5 higher than the top end of the intermediate tooth plate 6, after the control panel is placed in the installation groove 2, the control panel will first press down the side tooth plate 5, driving the inner end of the horizontal slide plate 3 to move above the control panel, and then press down the intermediate tooth plate 6, driving the bottom end of the vertical slide plate 4 to abut against the control panel. This setting can automatically clamp and fix the control panel, improving work efficiency.

[0021] As Figure 1 and Figure 3As shown in the figure, a fifth retraction cavity 7 is opened at the top end of the vertical slide plate 4. A spring rod 8 is slidably installed inside the fifth retraction cavity 7. The bottom end of the spring rod 8 is connected to the bottom end of the fifth retraction cavity 7 through a sixth abutting spring 9. The top end of the spring rod 8 extends above the vertical slide plate 4 and is fixedly connected to the top plate 10. The lower surface of the top plate 10 is connected to the upper surface of the horizontal slide plate 3 through a first abutting spring 11. By slidably installing the vertical slide plate 4 at the bottom of the top plate 10, when the top plate 10 is pulled down to drive the vertical slide plate 4 to slide down, when the bottom end of the vertical slide plate 4 abuts against the control panel, it does not affect the top plate 10 to continue sliding down, thus not affecting the intermediate tooth plate 6 to continue sliding down, making the device applicable to control panels of various thicknesses.

[0022] As Figure 1 and Figure 4 shown in the figure, steps 12 are fixedly installed at the bottoms of both ends of the installation groove 2. A second retraction cavity 13 is opened at the middle position of the top of the step 12. The intermediate tooth plate 6 is slidably installed inside the second retraction cavity 13 through a third abutting spring 14. The top end of the intermediate tooth plate 6 extends outside the second retraction cavity 13. The setting of the step 12 can prevent the electrical components at the bottom of the control panel from being damaged.

[0023] As Figure 4 shown in the figure, a linkage cavity 15 is opened inside the horizontal slide plate 3. A second linkage shaft 16 is rotatably installed inside the linkage cavity 15. A first pull rope 17 is fixedly installed on the lower surface of the top plate 10. The bottom end of the first pull rope 17 extends into the linkage cavity 15 and is fixedly connected to the second linkage shaft 16. A communication slide hole 18 is opened through the bottom of the linkage cavity 15.

[0024] As Figure 4 - Figure 5 shown in the figure, a sliding sleeve 19 is slidably installed on the outer surface of the second linkage shaft 16. A limiting chute 20 is opened on the outer surface of the second linkage shaft 16. A limiting slider 21 is fixedly installed on the inner surface of the sliding sleeve 19. The limiting slider 21 slides in the limiting chute 20. A holding ring 22 is rotatably installed on the outer surface of the sliding sleeve 19. A fixing rod 23 is fixedly installed on the outer surface of the holding ring 22. The bottom end of the fixing rod 23 passes through the communication slide hole 18 and is fixedly connected to the test seat 1. A gear shaft 24 is rotatably installed inside the test seat 1. A second gear 25 is coaxially fixedly installed at one end of the gear shaft 24. The second gear 25 is meshed with the intermediate tooth plate 6. A second pull rope 26 is wound around the outer surface of the sliding sleeve 19. The bottom end of the second pull rope 26 is fixedly connected to the outer surface of the gear shaft 24. By setting the second linkage shaft 16 and the sliding sleeve 19 sliding on the second linkage shaft 16, even if the horizontal slide plate 3 slides, the intermediate tooth plate 6 can still pull the top plate 10 and the vertical slide plate 4 to slide down when sliding down.

[0025] As Figure 2As shown, a driving tooth groove 27 is formed on the lower surface of the cross slide 3. A third gear 28 is rotatably installed inside the test seat 1. The third gear 28 is meshed with the driving tooth groove 27. One end of the third gear 28 is coaxially and fixedly installed with a fourth bevel gear 29. A first linkage shaft 30 is rotatably installed inside the test seat 1. The top and bottom ends of the first linkage shaft 30 are respectively coaxially and fixedly installed with a third bevel gear 31 and a second bevel gear 32. The third bevel gear 31 is meshed with the fourth bevel gear 29. A torsion spring shaft 33 is rotatably installed inside the test seat 1. The two ends of the torsion spring shaft 33 are respectively coaxially and fixedly installed with a first bevel gear 34 and a first gear 35. The first bevel gear 34 is meshed with the second bevel gear 32.

[0026] As Figure 1 - Figure 2 shown, first inner contraction cavities 36 are formed at positions near both ends on the upper surface of the step 12. A portal frame 38 is slidably installed in the first inner contraction cavity 36 through a second abutting spring 37. The horizontal section of the portal frame 38 is located above the middle tooth plate 6. The side tooth plate 5 is integrally installed at a position near the bottom inside one of the vertical sections of the portal frame 38. The first gear 35 is meshed with the side tooth plate 5; when the control panel presses the portal frame 38, the side tooth plate 5 drives the cross slide 3 to slide inwards. By setting the torsion spring shaft 33, when the cross slide 3 abuts against the side of the control panel, the portal frame 38 can still slide downwards. At this time, the torsion spring shaft 33 starts to wind up. After the upper surface of the control panel passes over the cross slide 3, the torsion spring shaft 33 unwinds, and the inner end of the cross slide 3 slides above the control panel again.

[0027] As Figure 1 and Figure 6 - Figure 7 shown, a reset shaft 39 is rotatably installed inside the bottom wall of the test seat 1. One end of the reset shaft 39 extends outside the test seat 1. Helical tooth grooves 40 are formed at positions near the top on the outside of the portal frame 38 and on one side near the top of the middle tooth plate 6. Three third inner contraction cavities 41 are formed inside one of the steps 12. The three third inner contraction cavities 41 are respectively located on both sides of the portal frame 38 and on the side of the middle tooth plate 6. An inclined tooth block 43 is slidably installed in the third inner contraction cavity 41 through a fourth abutting spring 42. A rope passing hole 44 is formed at the outer end of the third inner contraction cavity 41. The other end of the rope passing hole 44 is communicated with the reset shaft 39. The outer end of the inclined tooth block 43 is connected with the reset shaft 39 through a third pull rope 45; when the portal frame 38 and the middle tooth plate 6 both slide to the bottommost position, the inclined tooth block 43 will be stuck in the helical tooth groove 40 to prevent the portal frame 38 and the middle tooth plate 6 from sliding upwards. When the portal frame 38 and the middle tooth plate 6 need to be reset, rotate the reset shaft 39, and pull the inclined tooth block 43 out of the helical tooth groove 40 through the third pull rope 45.

[0028] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0030] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A test fixture for the production of an automotive control panel, comprising a test base (1), characterized in that, The top of the test base (1) is provided with an installation groove (2). At both ends of the installation groove (2) near the top, horizontally sliding cross-sliding plates (3) are installed through. At a position near the inner end of the cross-sliding plate (3), a vertically sliding vertical sliding plate (4) is installed through. At both ends of the installation groove (2) near the two ends, side tooth plates (5) and middle tooth plates (6) are slidably installed. The top of the side tooth plate (5) is higher than the top of the middle tooth plate (6). The side tooth plate (5) is drivingly connected to the cross-sliding plate (3), and the middle tooth plate (6) is drivingly connected to the vertical sliding plate (4).

2. The test fixture for producing an automotive control panel according to claim 1, characterized in that, The top of the vertical sliding plate (4) is provided with a fifth retraction cavity (7). Inside the fifth retraction cavity (7), a spring rod (8) is slidably installed. The bottom end of the spring rod (8) is connected to the bottom end of the fifth retraction cavity (7) through a sixth abutting spring (9). The top end of the spring rod (8) extends above the vertical sliding plate (4) and is fixedly connected to a top plate (10). The lower surface of the top plate (10) is connected to the upper surface of the cross-sliding plate (3) through a first abutting spring (11).

3. The test fixture for manufacturing an automotive control panel according to claim 2, wherein Steps (12) are fixedly installed at the bottoms of both ends of the installation groove (2). At the middle position of the top of the steps (12), a second retraction cavity (13) is opened. The middle tooth plate (6) is slidably installed inside the second retraction cavity (13) through a third abutting spring (14). The top end of the middle tooth plate (6) extends outside the second retraction cavity (13).

4. The test fixture for producing an automotive control panel according to claim 3, characterized in that, A linkage cavity (15) is opened inside the cross-sliding plate (3). Inside the linkage cavity (15), a second linkage shaft (16) is rotatably installed. The lower surface of the top plate (10) is fixedly installed with a first pull rope (17). The bottom end of the first pull rope (17) extends into the linkage cavity (15) and is fixedly connected to the second linkage shaft (16). A communication sliding hole (18) is opened through the bottom of the linkage cavity (15).

5. The test fixture for producing an automotive control panel according to claim 4, characterized in that, A sliding sleeve (19) is slidably installed on the outer surface of the second linkage shaft (16). A limiting sliding groove (20) is opened on the outer surface of the second linkage shaft (16). A limiting sliding block (21) is fixedly installed on the inner surface of the sliding sleeve (19). The limiting sliding block (21) slides inside the limiting sliding groove (20). A holding ring (22) is rotatably installed on the outer surface of the sliding sleeve (19). A fixing rod (23) is fixedly installed on the outer surface of the holding ring (22). The bottom end of the fixing rod (23) passes through the communication sliding hole (18) and is fixedly connected to the test base (1). A gear shaft (24) is rotatably installed inside the test base (1). One end of the gear shaft (24) is coaxially and fixedly installed with a second gear (25). The second gear (25) is meshed with the middle tooth plate (6). A second pull rope (26) is wound around the outer surface of the sliding sleeve (19). The bottom end of the second pull rope (26) is fixedly connected to the outer surface of the gear shaft (24).

6. The test fixture for manufacturing an automotive control panel according to claim 5, wherein, The lower surface of the cross slide plate (3) is provided with a driving tooth groove (27). A third gear (28) is rotatably installed inside the test seat (1). The third gear (28) is meshed and connected with the driving tooth groove (27). One end of the third gear (28) is coaxially and fixedly installed with a fourth bevel gear (29). A first linkage shaft (30) is rotatably installed inside the test seat (1). The top and bottom ends of the first linkage shaft (30) are respectively coaxially and fixedly installed with a third bevel gear (31) and a second bevel gear (32). The third bevel gear (31) is meshed and connected with the fourth bevel gear (29). A torsion spring shaft (33) is rotatably installed inside the test seat (1). The two ends of the torsion spring shaft (33) are respectively coaxially and fixedly installed with a first bevel gear (34) and a first gear (35). The first bevel gear (34) is meshed and connected with the second bevel gear (32).

7. The test fixture for manufacturing an automotive control panel according to claim 6, characterized in that, First retraction cavities (36) are respectively arranged at positions near both ends on the upper surface of the step (12). A portal frame (38) is slidably installed in the first retraction cavity (36) through a second abutting spring (37). The horizontal section of the portal frame (38) is located above the middle tooth plate (6). The side tooth plate (5) is integrally installed at a position near the bottom inside one of the vertical sections of the portal frame (38). The first gear (35) is meshed and connected with the side tooth plate (5).

8. A test fixture for the production of an automotive control panel according to claim 7, characterized in that, A reset shaft (39) is rotatably installed inside the bottom wall of the test seat (1). One end of the reset shaft (39) extends to the outside of the test seat (1). Oblique tooth grooves (40) are respectively arranged at positions near the top on the outer side of the portal frame (38) and at a position near the top on one side of the middle tooth plate (6). Three third retraction cavities (41) are arranged inside one of the steps (12). The three third retraction cavities (41) are respectively located on both sides of the portal frame (38) and on the side of the middle tooth plate (6). An oblique tooth block (43) is slidably installed in the third retraction cavity (41) through a fourth abutting spring (42). A rope passing hole (44) is arranged at the outer end of the third retraction cavity (41). The other end of the rope passing hole (44) is communicated with the reset shaft (39). The outer end of the oblique tooth block (43) is connected with the reset shaft (39) through a third pull rope (45).

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