A display screen assembly fixture

Abstract

This utility model relates to the field of display screen assembly technology, and provides a display screen assembly fixture, including a receiving box. An L-shaped plate is rotatably mounted on one end of the top of the receiving box via a driving mechanism. A horizontal plate is flipped and mounted on the upper part of one side of the L-shaped plate via a transmission mechanism. Moving blocks are slidably mounted at both ends of one side of the horizontal plate. A first pull-out mechanism is provided in the middle of one side of the horizontal plate, simultaneously driving two moving blocks to move relative to each other. This display screen assembly fixture, after the first pull-out mechanism operates, can move two moving blocks closer or further apart. After the second pull-out mechanism operates, it can move two support blocks closer or further apart, thus adjusting the spacing between several support blocks. This allows it to work with a clamping structure to clamp and fix different displays, improving the applicability of the device.

Description

Technical Field

[0001] This utility model belongs to the field of display screen assembly technology, and in particular relates to a display screen assembly fixture. Background Technology

[0002] An LED display screen is a flat panel display composed of small LED module panels. It is used to display various information such as text, images, videos, and recorded signals. In the manufacturing process of an LED display screen, multiple components need to be assembled onto the LED display screen, which requires the use of multi-component assembly fixtures.

[0003] Chinese patent CN209887476U discloses a multi-set assembly fixture for LED display production. This technical solution uses a clamping mechanism inside the operating table. When an electric push rod is energized, it pushes a gear at the front end to rotate on the upper end of a long rack. At the same time, the gear drives the cylindrical rack to slide inside the guide block. This causes the cylindrical rack to push the LED display onto the right end wall of the positioning block through the support block and the roller at the upper end of the guide cavity, thus fixing the LED display. Meanwhile, the pressure block compresses the spring, causing the spring to deform and contract, which can prevent excessive clamping force from the roller and damage to the LED display. This achieves the advantages of quick and easy fixing of the LED display. However, this display assembly fixture cannot be adapted to fix different specifications of display screens during use, reducing the applicability of the device. Furthermore, it can only assemble the upper surface of the display screen. After the upper surface is assembled, the display screen needs to be removed, flipped over, and fixed again. The operation is cumbersome and time-consuming, which is not conducive to the assembly and use of the display screen. Utility Model Content

[0004] This utility model provides a display screen assembly fixture, which aims to solve the problem that display screen assembly fixtures cannot be adapted to fix different specifications of display screens during use, thus reducing the applicability of the device.

[0005] This utility model is implemented as follows: a display screen assembly fixture includes a housing box. An L-shaped plate is rotatably provided at one end of the top of the housing box through a drive mechanism. A horizontal plate is flipped and provided on the upper part of one side of the L-shaped plate through a transmission mechanism. Movable blocks are slidably provided at both ends of one side of the horizontal plate. A first pull-out mechanism is provided in the middle of one side of the horizontal plate to simultaneously drive the two movable blocks to move relative to each other. The other end of the movable block is fixedly connected to a movable box. Support blocks are slidably arranged at both ends of the opposite surfaces of the two movable boxes. The outer end of the support block is provided with a clamping structure for clamping and fixing the display screen. The inner cavity of the movable box is provided with a second pull-out mechanism that drives the two support blocks to move relative to each other. The top of the receiving box is provided with a vertically movable placement plate for loading and unloading the display screen by means of a lifting mechanism.

[0006] Preferably, the driving mechanism includes a receiving box, a first motor, a driving gear, a rotating shaft, a driven gear, and a connecting plate. The receiving box is fixedly connected to one end of the top of the inner wall of the receiving box. The first motor is fixedly connected to the inner cavity of the receiving box. The driving gear is fixedly connected to the output shaft of the first motor. The rotating shaft is fixedly connected to one end of the top of the receiving box, and the bottom end of the rotating shaft extends into the inner cavity of the receiving box. The driven gear is fixedly connected to the bottom end of the rotating shaft and meshes with the driving gear. The connecting plate is fixedly connected to the top end of the rotating shaft, and the upper surface of the connecting plate is fixedly connected to the lower surface of the L-shaped plate.

[0007] Preferably, a connecting seat is fixedly connected to the upper surface of the L-shaped plate, and a plurality of connecting bolts are provided on the surface of the connecting seat. A plurality of internal threaded holes adapted to the connecting plate are opened on the upper surface of the connecting plate.

[0008] Preferably, the transmission mechanism includes a transmission box, a second motor, a rotating column, and two first pulleys. The transmission box is fixedly connected to the top of the other side of the L-shaped plate. The second motor is fixedly connected to the bottom of the inner cavity of the transmission box. The rotating column is rotatably disposed at the top of the inner cavity of the transmission box. The other end of the rotating column extends rotatably to one side of the L-shaped plate and is fixedly connected to the side wall of the horizontal plate. The two first pulleys are respectively fixedly connected to the other end of the rotating column and the output shaft surface of the second motor, and are connected by belt drive.

[0009] Preferably, the first pull-out mechanism includes a fixed box, a first bidirectional electric telescopic rod, and two connecting arms. The fixed box is fixedly connected to the middle of the other side of the horizontal plate. The first bidirectional electric telescopic rod is fixedly connected to the inner cavity of the fixed box. The two connecting arms are respectively fixedly connected to the two ends of the first bidirectional electric telescopic rod. The other end of the connecting arm is pulled out and extends to the outside of the fixed box, and is fixedly connected to the side wall of the moving block at the same end.

[0010] Preferably, the second pull-out mechanism includes a second bidirectional electric telescopic rod and two connecting blocks. The second bidirectional electric telescopic rod is fixedly connected to the middle of the inner cavity of the movable box. The two connecting blocks are respectively fixedly connected to the two ends of the second bidirectional electric telescopic rod. The inner side of the movable box is provided with a movable opening. The inner end of the support block extends into the inner cavity of the movable box through the movable opening and is fixedly connected to the side wall of the connecting block at the same end.

[0011] Preferably, the clamp structure includes a U-shaped plate, an abutment bolt, a torsion handle, and an elastic plate. The U-shaped plate is fixedly connected to the inner end of the support block, the abutment bolt is disposed on the top of the U-shaped plate, the torsion handle is fixedly connected to the top end of the abutment bolt, and the elastic plate is rotatably connected to the bottom end of the abutment bolt.

[0012] Preferably, the lifting mechanism includes a third motor, a vertical plate, a reinforcing rib, a threaded sleeve, a guide rod, a threaded rod, and two second pulleys. The third motor is fixedly connected to the bottom of the inner wall of the receiving box. The threaded rod is rotatably connected to the other end of the bottom of the inner cavity of the receiving box. The two second pulleys are respectively fixedly connected to the output shaft of the third motor and the bottom end of the surface of the threaded rod, and are connected by belt drive. The vertical plate is pulled out and disposed at the other end of the top of the receiving box. The threaded sleeve is embedded in the bottom of the vertical plate, and its bottom end extends to the outside of the vertical plate and is threadedly connected to the threaded rod. The guide rod is fixedly connected to the other end of the bottom of the inner wall of the receiving box. The vertical plate is slidably sleeved on the surface of the guide rod. The reinforcing rib is fixedly connected between the lower surface of the placement plate and the upper part of the other side of the vertical plate.

[0013] Beneficial effects Compared with the prior art, the beneficial effects of this utility model are: This utility model provides a display screen assembly fixture.

[0014] (1) After the first pull mechanism works, it can drive the two moving blocks to move closer or further away from each other. After the second pull mechanism works, it can drive the two support blocks to move closer or further away from each other. The spacing between several support blocks can be adjusted, and then the clamp structure can be used to clamp and fix different displays, improving the applicability of the device and facilitating the assembly of the display. After the fixing is completed, after the drive mechanism works, it can drive the L-shaped plate to rotate. After the transmission mechanism works, it can drive the horizontal plate to flip, which is convenient to change the angle and surface of the display assembly, thereby improving the assembly efficiency of the display surface.

[0015] (2) After the display screen is placed on the surface of the placement plate, the lifting mechanism can be used to move the display screen up and down, so as to move the display screen to the corresponding height position of several clamping structures, which is convenient for loading and fixing the display screen. After the assembly is completed, the placement plate can be raised to contact the display screen, and the fixing of the display screen can be released, so as to avoid the display screen falling during the unloading operation after the assembly is completed, improve the protection of the display screen during the unloading process, and facilitate the loading and unloading work of the display screen during the assembly process. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the clamp structure in this utility model; Figure 3 This is a schematic diagram of the transmission mechanism in this utility model; Figure 4 This is a schematic diagram of the drive mechanism in this utility model. Figure 5 This is a schematic diagram of the structure of the first pull-out mechanism and the second pull-out mechanism in this utility model; Figure 6 This is a schematic diagram of the lifting mechanism in this utility model.

[0017] In the diagram: 1. Receiving box; 2. Receiving housing; 3. First motor; 4. Driving gear; 5. Rotating shaft; 6. Driven gear; 7. Connecting plate; 8. Internal threaded hole; 9. L-shaped plate; 10. Connecting seat; 11. Connecting bolt; 12. Rotating column; 13. Second motor; 14. First pulley; 15. Horizontal plate; 16. Fixing box; 17. First bidirectional electric telescopic rod; 18. Connecting arm; 19. Moving block; 20. Moving box; 21. Second bidirectional electric telescopic rod; 22. Connecting block; 23. Support block; 24. U-shaped plate; 25. Transmission box; 26. Torque handle; 27. Abutment bolt; 28. Elastic plate; 29. ​​Movable opening; 30. Third motor; 31. Threaded rod; 32. Threaded sleeve; 33. Vertical plate; 34. Placement plate; 35. Reinforcing rib; 36. Second pulley; 37. Guide rod. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0019] First Embodiment Please see Figure 1-3This utility model provides a technical solution: a display screen assembly fixture, including a housing box 1. An L-shaped plate 9 is rotatably arranged at one end of the top of the housing box 1 through a drive mechanism. A horizontal plate 15 is flipped and arranged on the upper part of one side of the L-shaped plate 9 through a transmission mechanism. Movable blocks 19 are slidably arranged at both ends of one side of the horizontal plate 15. A first pull-out mechanism is arranged in the middle of one side of the horizontal plate 15 to simultaneously drive the two movable blocks 19 to move relative to each other.

[0020] The other end of the movable block 19 is fixedly connected to the movable box 20. Support blocks 23 are slidably arranged at both ends of the opposite sides of the two movable boxes 20. The outer end of the support block 23 is provided with a clamping structure for clamping and fixing the display screen. The inner cavity of the movable box 20 is provided with a second pull mechanism that drives the two support blocks 23 to move relative to each other. Above the receiving box 1, a placement plate 34 is provided by a lifting mechanism that moves vertically to support the display screen for loading and unloading.

[0021] In this embodiment, after the display screen is placed on the surface of the placement plate 34, the lifting mechanism can be used to move the display screen up and down, so as to move the display screen to the corresponding height position of several clamping structures, which facilitates the loading and fixing of the display screen in the clamping structures.

[0022] After the first pull-out mechanism is activated, it can drive the two moving blocks 19 to move closer or further apart. After the second pull-out mechanism is activated, it can drive the two support blocks 23 to move closer or further apart. This allows the spacing between several support blocks 23 to be adjusted, thereby enabling the clamping structure to clamp and fix different displays, improving the applicability of the device and facilitating the assembly of the displays.

[0023] After being fixed, the L-shaped plate 9 can be rotated by the drive mechanism, and the horizontal plate 15 can be flipped by the transmission mechanism, which makes it easier to change the angle and surface of the display screen assembly, thereby improving the assembly efficiency of the display screen surface.

[0024] After assembly, the screen can be released from its fixation by the placement plate 34 once it rises to contact the screen. This prevents the screen from falling during the unloading process after assembly, improves the protection of the screen during unloading, and facilitates the loading and unloading of the screen during assembly.

[0025] Second Embodiment Please refer to Figure 1 , Figure 2 and Figure 4Based on the same concept as the first embodiment described above, the drive mechanism includes a receiving box 2, a first motor 3, a driving gear 4, a rotating shaft 5, a driven gear 6, and a connecting plate 7. The receiving box 2 is fixedly connected to one end of the top of the inner wall of the receiving box 1. The first motor 3 is fixedly connected to the inner cavity of the receiving box 2. The driving gear 4 is fixedly connected to the output shaft of the first motor 3. The rotating shaft 5 is fixedly connected to one end of the top of the receiving box 1. The bottom end of the rotating shaft 5 extends into the inner cavity of the receiving box 2. The driven gear 6 is fixedly connected to the bottom end of the rotating shaft 5 and meshes with the driving gear 4. The connecting plate 7 is fixedly connected to the top end of the rotating shaft 5. The upper surface of the connecting plate 7 is fixedly connected to the lower surface of the L-shaped plate 9.

[0026] The upper surface of the L-shaped plate 9 is fixedly connected to a connecting seat 10, and the surface of the connecting seat 10 is provided with several connecting bolts 11. The upper surface of the connecting plate 7 is provided with several internal threaded holes 8 that are compatible with the connecting plate 7.

[0027] In this embodiment, after the first motor 3 starts working, it can drive the drive gear 4 to rotate, and then drive the rotating shaft 5 to rotate through the transmission of the driven gear 6. Then, through the connection of the connecting plate 7, it can drive the L-shaped plate 9 to rotate, which facilitates the adjustment of the screen's orientation.

[0028] Third Embodiment Please refer to Figure 1 and Figure 2 Based on the same concept as the first embodiment described above, the transmission mechanism includes a transmission box 25, a second motor 13, a rotating column 12, and two first pulleys 14. The transmission box 25 is fixedly connected to the top of the other side of the L-shaped plate 9. The second motor 13 is fixedly connected to the bottom of the inner cavity of the transmission box 25. The rotating column 12 is rotatably disposed at the top of the inner cavity of the transmission box 25. The other end of the rotating column 12 extends rotatably to one side of the L-shaped plate 9 and is fixedly connected to the side wall of the horizontal plate 15. The two first pulleys 14 are respectively fixedly connected to the other end of the rotating column 12 and the output shaft surface of the second motor 13, and are connected by belt drive.

[0029] In this embodiment, after the second motor 13 drives the first pulley 14 on the surface of its output shaft to rotate, it can drive the rotating column 12 to rotate through the belt and the first pulley 14 on the surface of the rotating column 12, thereby driving the horizontal plate 15 to flip, so as to facilitate the flipping and assembly of the fixed display screen.

[0030] Fourth embodiment Please refer to Figure 1 , Figure 2 and Figure 5Based on the same concept as the first embodiment described above, the first pull-out mechanism includes a fixed box 16, a first bidirectional electric telescopic rod 17, and two connecting arms 18. The fixed box 16 is fixedly connected to the middle of the other side of the horizontal plate 15. The first bidirectional electric telescopic rod 17 is fixedly connected to the inner cavity of the fixed box 16. The two connecting arms 18 are respectively fixedly connected to the two ends of the first bidirectional electric telescopic rod 17. The other end of the connecting arm 18 is pulled out and extends to the outside of the fixed box 16, and is fixedly connected to the side wall of the same end moving block 19.

[0031] In this embodiment, after the first bidirectional electric telescopic rod 17 is activated, it can drive the two connecting arms 18 to move in the inner cavity of the fixed box 16, thereby driving the two moving blocks 19 to move closer to each other or further away from each other.

[0032] Fifth embodiment Please refer to Figure 1 , Figure 2 and Figure 5 Based on the same concept as the first embodiment described above, the second pull-out mechanism includes a second bidirectional electric telescopic rod 21 and two connecting blocks 22. The second bidirectional electric telescopic rod 21 is fixedly connected to the middle of the inner cavity of the movable box 20, and the two connecting blocks 22 are respectively fixedly connected to the two ends of the second bidirectional electric telescopic rod 21. The inner side of the movable box 20 is laterally provided with an movable opening 29. The inner end of the support block 23 extends movably into the inner cavity of the movable box 20 through the interior of the movable opening 29, and is fixedly connected to the side wall of the corresponding connecting block 22 at the same end.

[0033] In this embodiment, after the second bidirectional electric telescopic rod 21 extends and retracts, the distance between the clamping structures can be changed through the connection between the connecting block 22 and the support block 23, thereby facilitating the clamping and fixing of displays of different specifications.

[0034] Sixth Embodiment Please refer to Figure 1 , Figure 2 and Figure 5 Based on the same concept as the first embodiment described above, the clamp structure includes a U-shaped plate 24, an abutment bolt 27, a torsion handle 26, and an elastic plate 28. The U-shaped plate 24 is fixedly connected to the inner end of the support block 23, the abutment bolt 27 is disposed on the top of the U-shaped plate 24, the torsion handle 26 is fixedly connected to the top of the abutment bolt 27, and the elastic plate 28 is rotatably connected to the bottom end of the abutment bolt 27.

[0035] In this embodiment, after the corner of the display screen is embedded inside the U-shaped plate 24, turning the torsion handle 26 will drive the abutment bolt 27 to rotate. During the rotation of the abutment bolt 27, the elastic plate 28 can be raised and lowered. When the lower surface of the elastic plate 28 abuts against the corner of the display screen, the display screen can be clamped and fixed.

[0036] Sixth Embodiment Please refer to Figure 2 , Figure 5 and Figure 6 Based on the same concept as the first embodiment described above, the lifting mechanism includes a third motor 30, a vertical plate 33, a reinforcing rib 35, a threaded sleeve 32, a guide rod 37, a threaded rod 31, and two second pulleys 36. The third motor 30 is fixedly connected to the bottom of the inner wall of the receiving box 1, and the threaded rod 31 is rotatably connected to the other end of the bottom of the inner cavity of the receiving box 1. The two second pulleys 36 are respectively fixedly connected to the output shaft of the third motor 30 and the bottom end of the surface of the threaded rod 31, and are connected by belt drive.

[0037] The vertical plate 33 is pulled out and installed at the other end of the top of the receiving box 1. The threaded sleeve 32 is embedded in the bottom of the vertical plate 33 and the bottom end extends to the outside of the vertical plate 33 and is threadedly connected to the threaded rod 31. The guide rod 37 is fixedly connected to the other end of the bottom of the inner wall of the receiving box 1. The vertical plate 33 is slidably sleeved on the surface of the guide rod 37. The reinforcing rib 35 is fixedly connected between the lower surface of the placement plate 34 and the upper part of the other side of the vertical plate 33.

[0038] In this embodiment, after the third motor 30 starts working, it can drive the second pulley 36 on the surface of its output shaft to rotate. Then, through the transmission between the belt and the second pulley 36 on the surface of the threaded rod 31, the threaded rod 31 can be driven to rotate. By using the threaded sleeve 32 to move up and down along the surface of the threaded rod 31, the placement plate 34 can be moved by the support of the vertical plate 33, thereby lifting the display screen. The reinforcing rib 35 strengthens the connection between the vertical plate 33 and the placement plate 34, and improves the stability of the placement plate 34 during the support process.

[0039] The working principle and usage process of this utility model are as follows: After the utility model is installed, the display screen is placed on the surface of the placement plate 34. The lifting mechanism then moves the display screen up and down to a position corresponding to the height of several clamping structures. The clamping structures then fix the display screen. The first pulling mechanism moves two moving blocks 19 closer or further apart. The second pulling mechanism moves two support blocks 23 closer or further apart, adjusting the spacing between the support blocks 23. This allows the clamping structures to hold and fix different display screens. After fixing, the drive mechanism rotates the L-shaped plate 9, and the transmission mechanism flips the horizontal plate 15, changing the angle and surface of the display screen assembly and improving the assembly efficiency. After assembly, the placement plate 34 is raised to contact the display screen, releasing the fixation and preventing the display screen from falling during the unloading operation.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A display screen assembly tool comprising a housing case (1), characterized in that: The top of the container (1) is provided with an L-shaped plate (9) through a drive mechanism. The upper part of one side of the L-shaped plate (9) is provided with a horizontal plate (15) through a transmission mechanism. Both ends of one side of the horizontal plate (15) are provided with moving blocks (19). The middle part of one side of the horizontal plate (15) is provided with a first pull-out mechanism that simultaneously drives the two moving blocks (19) to move relative to each other. The other end of the moving block (19) is fixedly connected to a moving box (20). Support blocks (23) are slidably provided at both ends of the opposite surfaces of the two moving boxes (20). The outer end of the support block (23) is provided with a clamping structure for clamping and fixing the display screen. The inner cavity of the moving box (20) is provided with a second pull mechanism for driving the two support blocks (23) to move relative to each other. Above the receiving box (1), a placement plate (34) is provided by a lifting mechanism that moves vertically to support the display screen for loading and unloading.

2. A display screen assembly tool as claimed in claim 1, wherein: The driving mechanism includes a housing (2), a first motor (3), a drive gear (4), a rotating shaft (5), a driven gear (6), and a connecting plate (7). The housing (2) is fixedly connected to one end of the top of the inner wall of the housing (1). The first motor (3) is fixedly connected to the inner cavity of the housing (2). The drive gear (4) is fixedly connected to the output shaft of the first motor (3). The rotating shaft (5) is fixedly connected to one end of the top of the housing (1). The bottom end of the rotating shaft (5) extends to the inner cavity of the housing (2). The driven gear (6) is fixedly connected to the bottom end of the rotating shaft (5) and meshes with the drive gear (4). The connecting plate (7) is fixedly connected to the top end of the rotating shaft (5). The upper surface of the connecting plate (7) is fixedly connected to the lower surface of the L-shaped plate (9).

3. A display screen assembly tool as claimed in claim 2, wherein: The upper surface of the L-shaped plate (9) is fixedly connected to a connecting seat (10), and the surface of the connecting seat (10) is provided with a number of connecting bolts (11). The upper surface of the connecting plate (7) is provided with a number of internal threaded holes (8) that are adapted to the connecting plate (7).

4. The display screen assembly tool of claim 1, wherein: The transmission mechanism includes a transmission box (25), a second motor (13), a rotating column (12), and two first pulleys (14). The transmission box (25) is fixedly connected to the top of the other side of the L-shaped plate (9). The second motor (13) is fixedly connected to the bottom of the inner cavity of the transmission box (25). The rotating column (12) is rotatably disposed at the top of the inner cavity of the transmission box (25). The other end of the rotating column (12) extends rotatably to one side of the L-shaped plate (9) and is fixedly connected to the side wall of the horizontal plate (15). The two first pulleys (14) are respectively fixedly connected to the other end of the rotating column (12) and the output shaft surface of the second motor (13), and are connected by belt drive.

5. A display screen assembly tool as in claim 1, wherein: The first pull-out mechanism includes a fixed box (16), a first bidirectional electric telescopic rod (17) and two connecting arms (18). The fixed box (16) is fixedly connected to the middle of the other side of the horizontal plate (15). The first bidirectional electric telescopic rod (17) is fixedly connected to the inner cavity of the fixed box (16). The two connecting arms (18) are respectively fixedly connected to the two ends of the first bidirectional electric telescopic rod (17). The other end of the connecting arm (18) is pulled out and extends to the outside of the fixed box (16) and is fixedly connected to the side wall of the moving block (19) at the same end.

6. A display screen assembly tool as in claim 1, wherein: The second pull-out mechanism includes a second bidirectional electric telescopic rod (21) and two connecting blocks (22). The second bidirectional electric telescopic rod (21) is fixedly connected to the middle of the inner cavity of the movable box (20). The two connecting blocks (22) are respectively fixedly connected to the two ends of the second bidirectional electric telescopic rod (21). The inner side of the movable box (20) is provided with a movable opening (29). The inner end of the support block (23) extends into the inner cavity of the movable box (20) through the interior of the movable opening (29) and is fixedly connected to the side wall of the corresponding connecting block (22) at the same end.

7. A display screen assembly tool as in claim 1, wherein: The clamp structure includes a U-shaped plate (24), an abutment bolt (27), a torsion handle (26), and an elastic plate (28). The U-shaped plate (24) is fixedly connected to the inner end of the support block (23). The abutment bolt (27) is located at the top of the U-shaped plate (24). The torsion handle (26) is fixedly connected to the top end of the abutment bolt (27). The elastic plate (28) is rotatably connected to the bottom end of the abutment bolt (27).

8. A display screen assembly tool as in claim 1, wherein: The lifting mechanism includes a third motor (30), a vertical plate (33), a reinforcing rib (35), a threaded sleeve (32), a guide rod (37), a threaded rod (31), and two second pulleys (36). The third motor (30) is fixedly connected to the bottom of the inner wall of the receiving box (1), and the threaded rod (31) is rotatably connected to the other end of the bottom of the inner cavity of the receiving box (1). The two second pulleys (36) are respectively fixedly connected to the output shaft of the third motor (30) and the bottom end of the surface of the threaded rod (31), and are connected by belt drive. The vertical plate (33) is pulled out and disposed at the other end of the top of the receiving box (1). The threaded sleeve (32) is embedded in the bottom of the vertical plate (33) and the bottom end extends to the outside of the vertical plate (33) and is threadedly connected to the threaded rod (31). The guide rod (37) is fixedly connected to the other end of the bottom of the inner wall of the receiving box (1). The vertical plate (33) is slidably sleeved on the surface of the guide rod (37). The reinforcing rib (35) is fixedly connected between the lower surface of the placement plate (34) and the upper part of the other side of the vertical plate (33).

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