Solid state disk assembling and pressing device

Abstract

The utility model relates to the related technical field of solid state disk assembly, in particular to a solid state disk assembly pressing device which comprises a control cabinet, universal wheels installed at the four corners of the bottom end of the control cabinet, a rotating column body installed in the middle of the top end of the control cabinet, and an operation table installed on the top of the rotating column body. A round hole with the same size as the rotating column body is formed in the middle of the operating table corresponding to the rotating column body; the buffering assembly is arranged on the first connecting block, and the buffering assembly is used for reducing impact force during pressing; the discharging assembly is arranged above the buffering assembly, and the discharging assembly is used for taking down the pressed solid state disk; the clamping assembly is arranged on the discharging assembly, the clamping assembly is used for clamping the solid state disk to be pressed, and the solid state disk assembling and pressing device aims at solving the problem of improving the production efficiency in the assembling and pressing work of the solid state disk with large-scale production.

Description

Technical Field

[0001] The utility model relates to the technical field related to the assembly of solid-state drives, in particular to a pressing device for the assembly of solid-state drives. Background Art

[0002] Currently, with the rapid development of information technology, solid-state drives, as the core components for data storage, have an increasing market demand. The traditional SSD assembly process relies on manual operation, with problems such as low efficiency, insufficient precision, and high costs. Therefore, developing a device that can automatically complete all the assembly steps of SSDs, especially the key pressing process, is of great significance for improving production efficiency and ensuring product quality.

[0003] In the prior art, the Chinese patent document with the publication number CN215658850U proposed a solid-state drive casing pressing device. By setting a base and a back plate vertically arranged on the base, a jig for placing the solid-state drive is provided on the base, and a pressing head located above the jig and a driving mechanism for driving the pressing head to move are provided on the back plate. The driving mechanism is connected to the pressing head. The solid-state drive casing pressing device proposed by the utility model first assembles components such as the circuit board and the hard disk in the upper and lower covers, then places the upper and lower covers into the jig, and finally drives the pressing head to move towards the upper and lower covers through the driving mechanism, so that the pressing head presses on the upper and lower covers, thereby closing the upper and lower covers together to achieve the mechanical assembly of the solid-state drive casing. However, consistent with the conventional technology, this device is only suitable for the assembly and pressing work of a single solid-state drive and is not suitable for large-scale production operations, with poor practicability. Therefore, the present application discloses a pressing device for the assembly of solid-state drives to solve the problem of improving production efficiency in the assembly and pressing work of solid-state drives with large-scale production. Summary of the Utility Model

[0004] In view of this, the purpose of the present utility model is to propose a pressing device for the assembly of solid-state drives to solve the problem of improving production efficiency in the assembly and pressing work of solid-state drives with large-scale production.

[0005] Based on the above purpose, the present utility model provides a pressing device for the assembly of solid-state drives, including: a control cabinet, universal wheels are installed at the four corners of the bottom end of the control cabinet, a rotating column is installed in the middle of the top end of the control cabinet, an operating table is installed at the top of the rotating column, a circular hole with the same size as the rotating column is opened in the middle of the operating table corresponding to the position of the rotating column, and a plurality of groups of first connection blocks are evenly arranged in an array around the top surface of the operating table. And a first mounting seat is installed on one side of the top of the control cabinet, a feeding slope is installed on the first mounting seat, a rotating column is installed on the control cabinet on one side of the feeding slope, a sliding groove is installed at the top end of the rotating column, and an upper pressing machine is installed at one end of the sliding groove.

[0006] A buffer assembly, which is arranged on the first connection block and is used to reduce the impact force during pressing.

[0007] A blanking assembly, which is arranged above the buffer assembly and is used to take down the pressed solid-state drive.

[0008] A clamping assembly, which is arranged on the blanking assembly and is used to clamp the solid-state drive to be pressed.

[0009] Preferably, the buffer assembly includes two groups of vertical guide rods. The two groups of vertical guide rods are slidably inserted on the first connection block. Circular grooves with the same size as the vertical guide rods are opened at the positions of the two groups of vertical guide rods at the upper end of the first connection block. A vertical spring is sleeved on the first connection block, and mounting frames are installed at the tops of the vertical guide rods.

[0010] Preferably, the bottom end of the vertical spring is installed on the surface of the upper end of the first connection block, and the top end of the vertical spring is installed on the bottom end of the mounting frame.

[0011] Preferably, the blanking assembly includes a connecting flat plate. Both ends of the connecting flat plate are connected to one side of the bottom ends of the two groups of mounting frames. A second mounting seat is installed in the middle of the connecting flat plate. Through circular grooves are opened on both sides of the top end of the second mounting seat. A first rotating shaft is rotatably inserted in the circular grooves, and limiting rings are installed at both ends of the first rotating shaft.

[0012] Preferably, movable blocks are installed at the positions of the two ends of the first rotating shaft corresponding to the mounting frames. The width of the movable blocks is greater than the width of the mounting frames. Square grooves that fit the mounting frames are opened at the parts of the lower end surfaces of the movable blocks corresponding to the mounting frames. A vertical cylinder is installed on the top surface of one end of the mounting frame. A set of through circular holes are opened at the top end of the vertical cylinder. A horizontal cylinder is rotatably inserted in the circular holes, and both ends of the horizontal cylinder are installed on the inner walls of the square grooves opened at the lower end surfaces of the movable blocks. A placement table is installed on the upper end surface of the movable block.

[0013] Preferably, the clamping assembly includes a third mounting seat, which is installed on the top surface of the placement table. A groove is opened in the middle of the third mounting seat. A rotating rod is installed on the inner wall of the groove. A limiting block is rotatably sleeved on the rotating rod. The limiting block is L-shaped. A fourth mounting seat is installed on the bottom surface of the limiting block. A groove identical to the third mounting seat is opened in the middle of the fourth mounting seat. A second rotating shaft is installed on the side wall of the groove. A set of second connection blocks are rotatably sleeved in the middle of the second rotating shaft.

[0014] Preferably, one end of the second connecting block is equipped with a telescopic rod, the other end of the telescopic rod is equipped with another group of the second connecting blocks, a telescopic spring is sleeved on the telescopic rod, and both ends of the telescopic spring are abutted against the side walls of the two groups of the second connecting blocks. A third rotating shaft is rotatably installed in the middle of the second connecting block installed at the lower end of the telescopic rod, and fifth mounting seats are installed at both ends of the third rotating shaft, and the fifth mounting seats are installed on the upper end surface of the placing table.

[0015] Advantages of the present utility model:

[0016] Flexible movement and efficient operation: By installing universal wheels at the bottom of the control cabinet, the flexible movement of the device is realized, which is convenient for quickly transferring between different working areas, improving the operation efficiency and convenience. At the same time, the design of the rotating cylinder and the operating platform installed on the top of the control cabinet enables the working angle to be adjusted without moving the device.

[0017] Buffer protection mechanism: The provided buffer assembly is directly installed on the first connecting block on the operating platform, effectively reducing the impact force generated between the upper press and the solid-state drive during the pressing process, avoiding damage to the solid-state drive or performance degradation caused by direct collision, and improving the yield and reliability of the product.

[0018] Automated blanking and efficient collection: The ingenious combination of the blanking assembly and the buffer assembly enables the solid-state drive after pressing to automatically slide down the blanking slope, realizing the automation and rapid collection of blanking, greatly saving the manual operation time and improving the production efficiency.

[0019] Precise clamping to ensure pressing quality: The setting of the clamping assembly can stably and precisely clamp the solid-state drive to be pressed, ensuring that the position of the solid-state drive remains fixed during the pressing process, thus avoiding problems such as uneven pressing or failure caused by position deviation, and improving the pressing quality and consistency. Description of the drawings

[0020] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only those of the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the present utility model;

[0022] Figure 2 It is a three-dimensional structural schematic diagram of a partial component cross-section of the present utility model;

[0023] Figure 3Schematic three-dimensional structure diagram of the clamping assembly of the present utility model;

[0024] Figure 4 The present utility model Figure 1 Enlarged structure diagram of part A in the present utility model.

[0025] The markings in the figure are:

[0026] 1. Control cabinet; 2. Operating table; 3. Universal wheel; 4. Feeding slope; 5. First mounting seat; 6. Rotating column; 7. Sliding groove; 8. Rotating column body; 9. Upper press; 10. First connecting block; 11. Vertical guide rod; 12. Vertical spring; 13. Mounting frame; 14. Vertical cylinder; 15. Horizontal cylinder; 16. Connecting flat plate; 17. Second mounting seat; 18. First rotating shaft; 19. Limiting ring; 20. Third mounting seat; 21. Limiting block; 22. Placing table; 23. Fourth mounting seat; 24. Second rotating shaft; 25. Second connecting block; 26. Third rotating shaft; 27. Expansion rod; 28. Expansion spring; 29. Fifth mounting seat; 30. Movable block. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with specific embodiments.

[0028] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the present utility model should have the ordinary meanings understood by those with ordinary skills in the field to which the present utility model belongs. The "first", "second" and similar terms used in the present utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0029] The present utility model provides a Figures 1 to 4 solid state drive assembly pressing device as shown in

[0030] Control cabinet 1, universal wheels 3 are installed at the four corners of the bottom end of the control cabinet 1, a rotating cylinder 8 is installed in the middle of the top end of the control cabinet 1, an operating platform 2 is installed at the top of the rotating cylinder 8, a circular hole with the same size as the rotating cylinder 8 is opened in the middle of the operating platform 2 corresponding to the position of the rotating cylinder 8, and a plurality of groups of first connection blocks 10 are evenly arranged around the top surface of the operating platform 2. And a first mounting seat 5 is installed on one side of the top of the control cabinet 1, a blanking slope 4 is installed on the first mounting seat 5, a rotating column 6 is installed on the control cabinet 1 on one side of the blanking slope 4, a sliding groove 7 is installed at the top end of the rotating column 6, and an upper press 9 is installed at one end of the sliding groove 7; a buffer assembly, the buffer assembly is arranged on the first connection block 10 and is used to reduce the impact force during pressing; a blanking assembly, the blanking assembly is arranged above the buffer assembly and is used to take off the pressed solid-state drive; a clamping assembly, the clamping assembly is arranged on the blanking assembly and is used to clamp the solid-state drive to be pressed. By installing the universal wheels 3 at the bottom end of the control cabinet 1, the flexible movement of the device is realized, which is convenient for quickly transferring between different working areas, improving the operation efficiency and convenience. At the same time, the design of the rotating cylinder 8 and the operating platform 2 installed on the top of the control cabinet 1 enables the working angle to be adjusted without moving the device. The buffer assembly directly installed on the first connection block 10 on the operating platform 2 effectively reduces the impact force generated between the upper press 9 and the solid-state drive during the pressing process, avoiding the damage or performance degradation of the solid-state drive caused by direct collision, and improving the product yield and reliability. The ingenious combination of the blanking assembly and the buffer assembly enables the pressed solid-state drive to automatically slide down to the blanking slope 4, realizing the automation and rapid collection of blanking, greatly saving the manual operation time and improving the production efficiency. The setting of the clamping assembly can stably and accurately clamp the solid-state drive to be pressed, ensuring that the position of the solid-state drive remains fixed during the pressing process, thus avoiding the problems of uneven pressing or failure caused by position deviation, and improving the pressing quality and consistency.

[0031] Further, in this example, as Figure 2As shown in the figure, the buffer assembly includes two sets of vertical guide rods 11. The two sets of vertical guide rods 11 are slidably inserted into the first connection block 10. At the positions of the two sets of vertical guide rods 11 on the upper end of the first connection block 10, circular grooves with the same size as the vertical guide rods 11 are provided. A vertical spring 12 is sleeved on the first connection block 10. Mounting brackets 13 are installed at the tops of the vertical guide rods 11. The bottom end of the vertical spring 12 is installed on the upper surface of the first connection block 10, and the top end of the vertical spring 12 is installed at the bottom end of the mounting bracket 13. When the press 9 performs a pressing operation, its downward pressure is first transmitted to the vertical guide rods 11 through the mounting brackets 13. Since the vertical guide rods 11 are designed to be slidably inserted into the circular grooves on the first connection block 10, this design allows the vertical guide rods 11 to slide to a certain extent along the axial direction of the circular grooves when subjected to external forces. During the sliding process of the vertical guide rods 11, the vertical spring 12 sleeved between the first connection block 10 and the mounting bracket 13 starts to play a role. The bottom end of the vertical spring 12 is fixed on the upper surface of the first connection block 10, and the top end abuts against the bottom end of the mounting bracket 13. Therefore, as the vertical guide rods 11 move downward, the vertical spring 12 will be gradually compressed, thereby converting part of the kinetic energy generated by the downward pressure into the elastic potential energy of the spring for storage. This process effectively slows down the direct impact of the downward pressure on the solid-state drive and plays a buffering role. When the pressing operation is completed, with the release of the external force, the vertical spring 12 will use the stored elastic potential energy to push the mounting bracket 13 and the vertical guide rods 11 to reset upward, thus returning to the initial state and preparing for the next pressing operation.

[0032] Further, in this example, as Figure 2 and Figure 4As shown, the blanking component includes a connecting flat plate 16. Both ends of the connecting flat plate 16 are connected to one side of the bottom ends of two groups of mounting frames 13. In the middle of the connecting flat plate 16, a second mounting seat 17 is installed. Through circular grooves are opened on both sides of the top end of the second mounting seat 17. A first rotating shaft 18 is rotatably inserted into the circular grooves. Limiting rings 19 are installed at both ends of the first rotating shaft 18. Moving blocks 30 are installed at the positions of both ends of the first rotating shaft 18 where they are located on the mounting frames 13. The width of the moving blocks 30 is greater than the width of the mounting frames 13. Square grooves that fit the mounting frames 13 are opened on the parts of the lower end surfaces of the moving blocks 30 that are located on the mounting frames 13. A vertical cylinder 14 is installed on the top surface of one end of the mounting frame 13. A group of through circular holes are opened at the top end of the vertical cylinder 14. A horizontal cylinder 15 is rotatably inserted into the circular holes. Both ends of the horizontal cylinder 15 are installed on the inner walls of the square grooves opened on the lower end surfaces of the moving blocks 30. A placing table 22 is installed on the upper end surface of the moving blocks 30. First of all, the connecting flat plate 16 serves as the basic framework of the entire blanking component. Its two ends are connected to one side of the bottom ends of two groups of mounting frames 13, ensuring a stable connection between the blanking component and the buffer component. In the middle of the connecting flat plate 16, the second mounting seat 17 is fixedly installed. The through circular grooves opened on it provide space for the rotation of the first rotating shaft 18. The first rotating shaft 18 is restricted in the circular grooves by the limiting rings 19, realizing stable rotation. At the same time, moving blocks 30 are installed at both ends of the first rotating shaft 18 respectively. The designed width of these moving blocks 30 is greater than that of the mounting frames 13, ensuring that they can be firmly connected to the mounting frames 13. In particular, square grooves that fit the mounting frames 13 are opened on the lower end surfaces of the moving blocks 30. This design enables the moving blocks 30 to slide and position precisely along the mounting frames 13. The vertical cylinder 14 is a key driving component of the blanking component. One end of it is installed on the top surface of the mounting frame 13, and the other end is connected to the horizontal cylinder 15 through the circular holes inside it. Both ends of the horizontal cylinder 15 are respectively fixed on the inner walls of the square grooves on the lower end surfaces of the moving blocks 30. In this way, when the vertical cylinder 14 expands and contracts, it can drive the moving blocks 30 to move up and down through the horizontal cylinder 15. After the pressing operation is completed, the solid-state drive is placed on the placing table 22. At this time, the vertical cylinder 14 starts to work, driving the moving blocks 30 and the placing table 22 as a whole to move downward. Due to the width design of the moving blocks 30, they will gradually break away from direct contact with the mounting frames 13 during the upward movement, but still maintain a stable movement trajectory under the restriction of the horizontal cylinder 15. When the placing table 22 rises to a certain height, the solid-state drive will slide into the blanking slope 4 along with it, thus completing the blanking process. At this time, the vertical cylinder 14 works again, driving the moving blocks 30 and the placing table 22 to return to the initial position, preparing for the next pressing and blanking operations.

[0033] Further, in this example, as Figure 3 and Figure 4As shown in the figure, the clamping assembly includes a third mounting base 20, which is mounted on the top surface of the placement table 22. A groove is provided in the middle of the third mounting base 20. A rotating rod is mounted on the inner wall of the groove. A limiting block 21 is rotatably sleeved on the rotating rod. The limiting block 21 is L-shaped. A fourth mounting base 23 is mounted on the bottom surface of the limiting block 21. A groove identical to that of the third mounting base 20 is provided in the middle of the fourth mounting base 23. A second rotating shaft 24 is mounted on the side wall of the groove. A set of second connecting blocks 25 is rotatably sleeved in the middle of the second rotating shaft 24. One end of the second connecting block 25 is mounted with a telescopic rod 27. The other end of the telescopic rod 27 is mounted with another set of second connecting blocks 25. A telescopic spring 28 is sleeved on the telescopic rod 27. Both ends of the telescopic spring 28 abut against the side walls of the two sets of second connecting blocks 25. A third rotating shaft 26 is rotatably mounted in the middle of the second connecting block 25 mounted at the lower end of the telescopic rod 27. Fifth mounting bases 29 are mounted at both ends of the third rotating shaft 26. The fifth mounting bases 29 are mounted on the upper end surface of the placement table 22. First of all, the third mounting base 20 is fixed on the top surface of the placement table 22. The groove inside it provides space for the installation of other components. On the rotating rod mounted on the inner wall of the groove, an L-shaped limiting block 21 is sleeved. This design enables the limiting block 21 to rotate around the rotating rod, so as to adjust its position to adapt to solid-state drives of different sizes. A fourth mounting base 23 is mounted on the bottom surface of the limiting block 21. It also has a groove and a second rotating shaft 24 is mounted on its side wall. Two sets of second connecting blocks 25 are sleeved on the second rotating shaft 24. These two sets of second connecting blocks 25 are connected by a telescopic rod 27. The telescopic spring 28 sleeved on the telescopic rod 27 plays a role of buffering and resetting. When it is necessary to clamp the solid-state drive, the operator can put in the solid-state drive. At this time, the telescopic rod 27 contracts, thereby driving the two sets of second connecting blocks 25 to approach each other. Due to the existence of the telescopic spring 28, there will be a certain resistance during this process. But as the telescopic rod 27 continues to contract, the telescopic spring 28 is gradually compressed until the second connecting block 25 reaches the predetermined clamping position. At this time, the third rotating shaft 26 mounted in the middle of the second connecting block 25 at the lower end of the telescopic rod 27 starts to play a role. Fifth mounting bases 29 are respectively mounted at both ends of the third rotating shaft 26. These fifth mounting bases 29 are fixed on the upper end surface of the placement table 22, ensuring the stability of the clamping assembly. As the rotating shaft mounted on the inner wall of the groove of the third mounting base 20 rotates, the top of the limiting block 21 starts to clamp the solid-state drive. When the pressing operation is completed, with the operation of the blanking assembly, the solid-state drive is released. The entire clamping process is both stable and reliable, ensuring that the position of the solid-state drive remains unchanged during the pressing process, improving the pressing quality and production efficiency.

[0034] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0035] The present invention is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A solid-state drive assembly pressing device, characterized in that, Including: A control cabinet (1), universal wheels (3) are installed at the four corners of the bottom end of the control cabinet (1), a rotating cylinder (8) is installed in the middle of the top end of the control cabinet (1), an operating platform (2) is installed at the top of the rotating cylinder (8), a round hole with the same size as the rotating cylinder (8) is opened in the middle of the operating platform (2) corresponding to the position of the rotating cylinder (8), and a plurality of groups of first connecting blocks (10) are evenly arranged in an array around the top surface of the operating platform (2). And a first mounting seat (5) is installed on one side of the top of the control cabinet (1), a blanking slope (4) is installed on the first mounting seat (5), a rotating column (6) is installed on the control cabinet (1) on one side of the blanking slope (4), a sliding groove (7) is installed at the top end of the rotating column (6), and an upper press (9) is installed at one end of the sliding groove (7); A buffer assembly, the buffer assembly is arranged on the first connecting block (10), and the buffer assembly is used to reduce the impact force during pressing; A blanking assembly, the blanking assembly is arranged above the buffer assembly, and the blanking assembly is used to take down the pressed solid-state drive; A clamping assembly, the clamping assembly is arranged on the blanking assembly, and the clamping assembly is used to clamp the solid-state drive to be pressed.

2. The solid-state drive assembly pressing device according to claim 1, wherein The buffer assembly includes two vertical guide rods (11), the two vertical guide rods (11) are slidably inserted on the first connecting block (10), round grooves with the same size as the vertical guide rods (11) are opened in the first connecting block (10) at the positions of the two vertical guide rods (11) at the upper end, a vertical spring (12) is sleeved on the first connecting block (10), and mounting frames (13) are installed at the top ends of the vertical guide rods (11).

3. The assembly and pressing device for a solid-state drive according to claim 2, wherein The bottom end of the vertical spring (12) is installed on the surface of the upper end of the first connecting block (10), and the top end of the vertical spring (12) is installed on the bottom end of the mounting frame (13).

4. A solid-state drive assembly pressing device according to claim 3, characterized in that, The blanking assembly includes a connecting flat plate (16), both ends of the connecting flat plate (16) are connected to one side of the bottom ends of the two mounting frames (13), a second mounting seat (17) is installed in the middle of the connecting flat plate (16), through round grooves are opened on both sides of the top end of the second mounting seat (17), a first rotating shaft (18) is rotatably inserted in the round grooves, and limiting rings (19) are installed at both ends of the first rotating shaft (18).

5. The solid state drive assembly pressing device according to claim 4, wherein, At both ends of the first rotating shaft (18) located at the position of the mounting bracket (13), movable blocks (30) are installed. The width of the movable blocks (30) is greater than the width of the mounting bracket (13). A square groove that fits the mounting bracket (13) is formed in the part of the lower end surface of the movable block (30) located at the mounting bracket (13). A vertical cylinder (14) is installed on the top surface of one end of the mounting bracket (13). A group of through round holes are formed at the top end of the vertical cylinder (14). A horizontal cylinder (15) is rotatably inserted in the round holes. Both ends of the horizontal cylinder (15) are installed on the inner wall of the square groove formed in the lower end surface of the movable block (30). A placing table (22) is installed on the upper end surface of the movable block (30).

6. The solid-state drive assembly pressing device according to claim 5, wherein The clamping assembly includes a third mounting seat (20). The third mounting seat (20) is installed on the top surface of the placing table (22). A groove is formed in the middle of the third mounting seat (20). A rotating rod is installed on the inner wall of the groove. A limiting block (21) is rotatably sleeved on the rotating rod. The limiting block (21) is L-shaped. A fourth mounting seat (23) is installed on the bottom surface of the limiting block (21). A groove identical to the third mounting seat (20) is formed in the middle of the fourth mounting seat (23). A second rotating shaft (24) is installed on the side wall of the groove. A group of second connecting blocks (25) are rotatably sleeved in the middle of the second rotating shaft (24).

7. The SSD assembly pressing device according to claim 6, wherein One end of the second connecting block (25) is installed with a telescopic rod (27). The other end of the telescopic rod (27) is installed with another group of the second connecting blocks (25). A telescopic spring (28) is sleeved on the telescopic rod (27). Both ends of the telescopic spring (28) are abutted against the side walls of the two groups of the second connecting blocks (25). A third rotating shaft (26) is rotatably installed in the middle of the second connecting block (25) installed at the lower end of the telescopic rod (27). Both ends of the third rotating shaft (26) are installed with fifth mounting seats (29). The fifth mounting seats (29) are installed on the upper end surface of the placing table (22).

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