Efficient mechanical pressing device for new energy battery packaging

Abstract

The invention belongs to the technical field of battery manufacturing, and discloses an efficient mechanical pressing device for new energy battery packaging. A transverse positioning assembly; a longitudinal positioning assembly; a moving assembly; and a driving assembly and a pressing assembly. Through the Z-shaped pressing assembly and the four third hydraulic rods, the stroke is increased at the same time, the Z-shaped plate is vertically downward, the top shell and the bottom shell are subjected to one-time pressing in the vertical direction, and after the top shell and the bottom shell are lifted downward again, the stroke of the two third hydraulic rods on the right side is longer than that of the third hydraulic rods on the left side, so that the Z-shaped plate can conduct one-time inclined pressing on the top cover in a left inclined mode; and in the pressing process, the Z-shaped plate can rotate around the axis where two second rotating shafts and a third rotating shaft are located and compress a plurality of third springs in the Z-shaped plate, and the problem that an existing pressing device only adopts a single longitudinal pressing mode from top to bottom to conduct one-time pressing, so that the pressing efficiency is high is solved. Therefore, the problem that the pressing gaps of the corresponding edges between the upper cover and the bottom shell are inconsistent is possibly caused.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery manufacturing, and in particular relates to a high-efficiency mechanical pressing device for packaging new energy batteries. Background Art

[0002] New energy battery packaging is a crucial link in the manufacturing process of power batteries. It is directly related to the performance, safety, life and cost of the battery. Square batteries are widely used by domestic automakers due to their customizable volume, compact arrangement, higher energy density than cylindrical batteries, simpler production process, thinner volume, and good heat dissipation. The packaging process involves not only physical protection, but also electrical connection, thermal management, mechanical stability and other factors.

[0003] The battery pack mainly includes battery cells, shell structures and management systems, among which the shell structures play the role of placement and protection. Generally, an upper and lower cover method is adopted. After the battery cells and other circuit boards in the bottom shell are placed, the upper cover is locked with bolts. However, in the actual production process, there are production tolerances between the upper cover and the bottom shell. Generally, they need to be mechanically pressed before they can be bolted. However, the existing pressing device only uses a single top-down longitudinal pressing method for one-time pressing, which may cause the corresponding edge pressing gaps between the upper cover and the bottom shell to be inconsistent, resulting in inconsistent stress of the bolts in the next bolt locking process, thereby causing deformation of the upper cover. Summary of the invention

[0004] The purpose of the present invention is to provide a high-efficiency mechanical pressing device for new energy battery packaging to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an efficient mechanical pressing device for new energy battery packaging, comprising a supporting component, wherein both the front and rear sides of the supporting component are fixedly installed with a lateral positioning component, and further comprising a linkage pressing structure, which comprises two longitudinal positioning components, wherein both the longitudinal positioning components are fixedly installed on the left and right sides of the supporting component, and a moving component is fixedly installed on the inner side of the two longitudinal positioning components, and the inner movable card of the moving component is connected with a driving component;

[0006] A pressing assembly, wherein the pressing assembly is movably hinged at the bottom of the driving assembly, and the pressing assembly includes a Z-shaped plate, which can be divided into three parts: a top plate, an inclined plate and a bottom plate from top to bottom, and the connecting parts thereof are all hinged. Two groups of U-shaped rods are fixedly installed on the top of the Z-shaped plate, a second rotating shaft is movably hinged on the left side of the upper layer of the Z-shaped plate, and a third rotating shaft is movably hinged on the right side of the lower layer of the Z-shaped plate. A plurality of third springs are elastically connected to the upper and lower sides of the inclined plate of the Z-shaped plate, and a rotating balance is rotatably installed at the middle position of the inclined plate of the Z-shaped plate.

[0007] Preferably, the top end of the third spring on the left side is elastically connected to the top plate of the Z-shaped plate, and the top end of the third spring on the right side is elastically connected to the bottom plate of the Z-shaped plate.

[0008] Preferably, the supporting assembly includes a base, and a plurality of rollers are rotatably installed in the middle position of the base, the front rotating ends of the plurality of rollers are fixedly connected to pulleys, the outer edges of the plurality of pulleys are movably sleeved with belts, the rotating shaft of the right pulley is fixedly connected to a motor, and the bottom of the motor is fixedly connected to the base.

[0009] Preferably, the two lateral positioning assemblies include a fixing plate, the two fixing plates are fixedly mounted on the front and rear sides of the base, two first hydraulic rods are fixedly mounted on the top of the fixing plates, the telescopic ends of the two first hydraulic rods are fixedly connected with a Y-shaped rod, and the front ends of the two Y-shaped rods are rotatably mounted with two rubber wheels.

[0010] Preferably, the two longitudinal positioning assemblies include two groups of support seats, and the two groups of support seats are respectively fixedly mounted on the left and right sides of the base, and a second hydraulic rod is obliquely mounted on the top of the support seat, and the telescopic end of the second hydraulic rod is fixedly connected to a trapezoidal block, and a first rotating shaft is rotatably mounted on the right side of the middle part of the trapezoidal block, and a first rotating shaft is elastically connected to a first spring on the outer edge, and the other end of the first spring is fixedly connected to a fixed shaft, and the fixed shaft is fixedly mounted on the top of the support seat.

[0011] Preferably, the moving assembly includes four longitudinal rods, the four longitudinal rods are fixedly installed on the top of the base, two screw rods are fixedly installed on the top of the four longitudinal rods, the outer edges of the two screw rods are threadedly connected to the stepper motor, the outer edges of the two stepper motors are fixedly installed with a rectangular frame, and the inner sides of the two long sides of the rectangular frame are provided with tracks.

[0012] Preferably, the driving assembly includes four electric wheels, and the four electric wheels are movably clamped in the two tracks. The central axes of the four electric wheels are fixedly connected with L-shaped blocks, the bottoms of the four L-shaped blocks are fixedly connected with third hydraulic rods, the outer edges of the telescopic ends of the four third hydraulic rods are movably sleeved with second springs, and the telescopic ends of the four third hydraulic rods are movably hinged to the four U-shaped rods.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. The present invention is equipped with a Z-shaped pressing assembly, and four third hydraulic rods increase their strokes at the same time. The Z-shaped plate moves vertically downward, and the top shell and the bottom shell are pressed in the vertical direction. After being lifted downward again, the strokes of the two third hydraulic rods on the right are longer than those on the left, so that the Z-shaped plate can press the top cover in an oblique manner in a left-oblique manner, and the right-oblique pressing is performed in the opposite direction. During the pressing process, the Z-shaped plate rotates around the two second rotating shafts and the axis where the third rotating shaft is located, rotates toward the position of the oblique plate between the bottom plate and the top plate, and compresses multiple third springs therein, thereby solving the problem that the existing pressing device only uses a single top-down longitudinal pressing method for one-time pressing, which may cause the corresponding edge pressing gaps between the top cover and the bottom shell to be inconsistent.

[0015] 2. The present invention is equipped with a newly designed longitudinal positioning assembly. When the roller drives the bottom shell to move to the middle position of the supporting assembly, the two longitudinal positioning assemblies are started, and the second hydraulic rod increases the stroke to obliquely push the trapezoidal blocks to the left and right sides of the bottom shell. During the movement of the trapezoidal blocks, the first rotating shaft will rotate and displace, pulling the first spring on the fixed shaft to complete the elastic deformation. When the four trapezoidal blocks complete the clamping of the bottom shell, the bottom shell is at the longitudinal center of the supporting assembly. The contact part of the trapezoidal blocks and the bottom shell will have a certain displacement clearance through the first spring to prevent the damage of the bottom shell by the hydraulic pressure.

[0016] 3. The present invention is equipped with a displacement mechanism in which a moving assembly and a driving assembly are matched. The stepping motor drives the rectangular frame to move longitudinally on the screw rod, moves the driving assembly and the pressing assembly to a position close to the battery bottom shell and the top cover, and then starts the four electric wheels. The four electric wheels move in the track and position the pressing assembly to the longitudinal position of the bottom shell again. Through the moving and positioning action of the moving assembly and the driving assembly, it is ensured that the pressing assembly is directly above the top shell, thereby improving the accuracy of the pressing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the supporting assembly structure of the present invention;

[0019] Figure 3 For the present invention Figure 2 A schematic diagram of the structure enlargement in the middle;

[0020] Figure 4 For the present invention Figure 2 A magnified schematic diagram of the structure at B in the middle;

[0021] Figure 5 This is a schematic diagram of the structure of the mobile assembly of the present invention;

[0022] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at C in the middle;

[0023] Figure 7 It is a schematic diagram of the structure of the pressing assembly of the present invention.

[0024] In the figure: 1. supporting assembly; 2. lateral positioning assembly; 3. longitudinal positioning assembly; 4. moving assembly; 5. driving assembly; 6. pressing assembly; 11. base; 12. roller; 13. pulley; 14. belt; 15. motor; 21. fixed plate; 22. first hydraulic rod; 23. Y-shaped rod; 24. rubber wheel; 31. supporting seat; 32. second hydraulic rod; 33. trapezoidal block; 34. first rotating shaft; 35. first spring; 36. fixed shaft; 41. longitudinal rod; 42. screw rod; 43. rectangular frame; 44. stepping motor; 45. track; 51. electric wheel; 52. L-shaped block; 53. third hydraulic rod; 54. second spring; 61. Z-shaped plate; 62. U-shaped rod; 63. second rotating shaft; 64. third rotating shaft; 65. third spring; 66. rotational balancing. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] like Figures 1 to 7 As shown, an embodiment of the present invention provides a high-efficiency mechanical pressing device for new energy battery packaging, including a supporting component 1, a lateral positioning component 2 is fixedly installed on both the front and rear sides of the supporting component 1, and also includes:

[0027] The linkage pressing structure includes two longitudinal positioning components 3, which are fixedly installed on the left and right sides of the supporting component 1, and the inner sides of the two longitudinal positioning components 3 are fixedly installed with a moving component 4, and the inner side of the moving component 4 is movably connected with a driving component 5;

[0028] The pressing assembly 6 is hinged at the bottom of the driving assembly 5. The pressing assembly 6 includes a Z-shaped plate 61. The Z-shaped plate 61 can be divided into three parts: a top part, an inclined plate and a bottom plate from top to bottom. The connecting parts are all hinged. Two groups of U-shaped rods 62 are fixedly installed on the top of the Z-shaped plate 61. The upper left side of the Z-shaped plate 61 is hinged with a second rotating shaft 63. The lower right side of the Z-shaped plate 61 is hinged with a third rotating shaft 64. The upper and lower sides of the inclined plate of the Z-shaped plate 61 are elastically connected to a plurality of third springs 65. A rotating balance 66 is rotatably installed in the middle of the inclined plate of the Z-shaped plate 61. The top end of the left third spring 65 is elastically connected to the top plate of the Z-shaped plate 61, and the top end of the right third spring 65 is elastically connected to the bottom plate of the Z-shaped plate 61.

[0029] The stroke of the four third hydraulic rods 53 on the left and right is increased at the same time, and the Z-shaped plate 61 hinged thereto will move vertically downward to press the top shell and the bottom shell in the vertical direction. At this time, the four third hydraulic rods 53 shorten their strokes again to drive the Z-shaped plate 61 to lift once and then move downward again. This time, the strokes of the two third hydraulic rods 53 on the right are longer than those on the left, so that the Z-shaped plate 61 can press the top cover obliquely in a left oblique manner. The right oblique pressing is performed in the opposite way. During the pressing process, the Z-shaped plate 61 rotates around the axis where the two second rotating shafts 63 and the third rotating shaft 64 are located, rotates toward the oblique plate position between the bottom plate and the top plate, and compresses the multiple third springs 65 therein. When pressing left and right obliquely, a motor is installed in the rotary balancing 66, which automatically rotates to the opposite position of the pressing to complete the balancing, thereby solving the problem that the existing pressing device only uses a single top-down longitudinal pressing method for one-time pressing, which may cause the corresponding edge pressing gaps between the top cover and the bottom shell to be inconsistent.

[0030] The supporting assembly 1 includes a base 11, a plurality of rollers 12 are rotatably mounted at the middle of the base 11, the front rotating ends of the plurality of rollers 12 are fixedly connected to pulleys 13, the outer edges of the plurality of pulleys 13 are movably sleeved with belts 14, the rotating shaft of the right pulley 13 is fixedly connected to a motor 15, and the bottom of the motor 15 is fixedly connected to the base 11;

[0031] The motor 15 is started, and the motor 15 rotates clockwise, and the belt 14 and the pulley 13 drive the multiple motors 15 to rotate clockwise, so that the multiple rollers 12 can convey the battery bottom shell from left to right;

[0032] The two lateral positioning components 2 include a fixing plate 21, which is fixedly mounted on the front and rear sides of the base 11, and two first hydraulic rods 22 are fixedly mounted on the top of the fixing plate 21, and the telescopic ends of the two first hydraulic rods 22 are fixedly connected with Y-shaped rods 23, and the front ends of the two Y-shaped rods 23 are rotatably mounted with two rubber wheels 24;

[0033] During the transportation of the bottom shell, the front and rear two transverse positioning assemblies 2 are started, the first hydraulic rod 22 increases the stroke, and the four sets of rubber wheels 24 are driven to approach the bottom shell through the Y-shaped rod 23, and the bottom shell is slowly positioned so that it can be located at the transverse center of the supporting assembly 1;

[0034] The two longitudinal positioning components 3 include two groups of support seats 31, which are fixedly installed on the left and right sides of the base 11 respectively. A second hydraulic rod 32 is obliquely installed on the top of the support seat 31. The telescopic end of the second hydraulic rod 32 is fixedly connected to a trapezoidal block 33. A first rotating shaft 34 is rotatably installed at the right position of the middle part of the trapezoidal block 33. The outer edge of the first rotating shaft 34 is elastically connected to a first spring 35. The other end of the first spring 35 is fixedly connected to a fixed shaft 36. The fixed shaft 36 is fixedly installed on the top of the support seat 31.

[0035] When the roller 12 drives the bottom shell to move to the middle position of the supporting assembly 1, the two longitudinal positioning assemblies 3 are started, and the second hydraulic rod 32 increases the stroke, obliquely pushing the trapezoidal block 33 to the left and right sides of the bottom shell. During the movement of the trapezoidal block 33, the first rotating shaft 34 will rotate and move, pulling the first spring 35 on the fixed shaft 36 to complete elastic deformation, so that the contact part of the trapezoidal block 33 and the bottom shell will have a certain displacement clearance to prevent the hydraulic pressure from damaging the bottom shell. When the four trapezoidal blocks 33 complete the clamping of the bottom shell, the bottom shell is at the longitudinal center of the supporting assembly 1;

[0036] The moving assembly 4 includes four longitudinal rods 41, which are fixedly mounted on the top of the base 11. Two screw rods 42 are fixedly mounted on the top of the four longitudinal rods 41. The outer edges of the two screw rods 42 are threadedly connected to stepper motors 44. A rectangular frame 43 is fixedly mounted on the outer edges of the two stepper motors 44. Tracks 45 are provided on the inner sides of the two long sides of the rectangular frame 43.

[0037] The stepper motor 44 drives the rectangular frame 43 to move longitudinally on the screw rod 42, moves the driving assembly 5 and the pressing assembly 6 to a position close to the battery bottom shell and the top cover, and then starts the four electric wheels 51, which move in the track 45 to position the pressing assembly 6 at the longitudinal position of the bottom shell again. Through the moving and positioning action of the moving assembly 4 and the driving assembly 5, it is ensured that the pressing assembly 6 is directly above the top shell;

[0038] The driving assembly 5 includes four electric wheels 51, which are all movably connected to the two tracks 45. The central axes of the four electric wheels 51 are all fixedly connected with L-shaped blocks 52, and the bottoms of the four L-shaped blocks 52 are all fixedly connected with third hydraulic rods 53. The outer edges of the telescopic ends of the four third hydraulic rods 53 are all movably sleeved with second springs 54, and the telescopic ends of the four third hydraulic rods 53 are all movably hinged with four U-shaped rods 62.

[0039] The four electric wheels 51 move in the track 45 to position the pressing assembly 6 at the longitudinal position of the bottom shell again. Through the moving and positioning action of the moving assembly 4 and the driving assembly 5, it is ensured that the pressing assembly 6 is directly above the top shell.

[0040] Working principle:

[0041] When using the present invention, firstly, the battery bottom shell and the upper cover to be pressed together are placed on the supporting assembly 1, and the motor 15 is started. The motor 15 rotates clockwise, and the belt 14 and the pulley 13 drive the multiple motors 15 to rotate clockwise, so that the multiple rollers 12 can convey the battery bottom shell from left to right;

[0042] During the transportation of the bottom shell, the front and rear two transverse positioning assemblies 2 are started, the first hydraulic rod 22 increases the stroke, and the four sets of rubber wheels 24 are driven to approach the bottom shell through the Y-shaped rod 23, and the bottom shell is slowly positioned so that it can be located at the transverse center of the supporting assembly 1;

[0043] When the roller 12 drives the bottom shell to move to the middle position of the supporting assembly 1, the two longitudinal positioning assemblies 3 are started, and the second hydraulic rod 32 increases the stroke, obliquely pushing the trapezoidal block 33 to the left and right sides of the bottom shell. During the movement of the trapezoidal block 33, the first rotating shaft 34 will rotate and move, pulling the first spring 35 on the fixed shaft 36 to complete elastic deformation, so that the contact part of the trapezoidal block 33 and the bottom shell will have a certain displacement clearance to prevent the hydraulic pressure from damaging the bottom shell. When the four trapezoidal blocks 33 complete the clamping of the bottom shell, the bottom shell is at the longitudinal center of the supporting assembly 1;

[0044] The battery shell is displaced to the exact center of the supporting assembly 1, the moving assembly 4 is started, and the stepping motor 44 drives the rectangular frame 43 to move longitudinally on the screw rod 42, and the driving assembly 5 and the pressing assembly 6 are moved to a position close to the battery bottom shell and the top cover, and then the four electric wheels 51 are started, and the four electric wheels 51 move in the track 45, and the pressing assembly 6 is positioned at the longitudinal position of the bottom shell again. After the moving and positioning action of the moving assembly 4 and the driving assembly 5, it is ensured that the pressing assembly 6 is directly above the top shell;

[0045] At this time, the stroke of the four third hydraulic rods 53 on the left and right are increased at the same time, and the Z-type plate 61 hinged thereto will move vertically downward to press the top shell and the bottom shell in the vertical direction. At this time, the four third hydraulic rods 53 shorten their strokes again to drive the Z-type plate 61 to lift once, and then move downward again. This time, the stroke of the two third hydraulic rods 53 on the right is longer than that on the left, so that the Z-type plate 61 can press the top cover obliquely in a left-oblique manner, and the right-oblique pressing is the opposite operation. During the pressing process, the Z-type plate 61 will rotate around the axis where the two second rotating shafts 63 and the third rotating shaft 64 are located, rotate toward the oblique plate position between the bottom plate and the top plate, and compress the multiple third springs 65 therein. When pressing left and right, a motor is installed in the rotary balancing 66, which automatically rotates to the opposite position of the pressing to complete the balancing, and the workflow ends here.

[0046] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An efficient mechanical pressing device for packaging new energy batteries, comprising a supporting assembly (1), characterized in that: The supporting component (1) is fixedly provided with a lateral positioning component (2) on both the front and rear sides thereof, and further comprises: A linkage pressing structure, comprising two longitudinal positioning components (3), the two longitudinal positioning components (3) are fixedly mounted on the left and right sides of the supporting component (1), a moving component (4) is fixedly mounted on the inner sides of the two longitudinal positioning components (3), and a driving component (5) is movably connected to the inner side of the moving component (4); A pressing assembly (6), wherein the pressing assembly (6) is movably hinged at the bottom of the driving assembly (5), and the pressing assembly (6) comprises a Z-shaped plate (61). The Z-shaped plate (61) can be divided into three parts from top to bottom, namely, a top part, an inclined plate and a bottom plate, and the connecting parts thereof are all hinged. Two groups of U-shaped rods (62) are fixedly installed at the top of the Z-shaped plate (61), a second rotating shaft (63) is movably hinged at the left side of the upper layer of the Z-shaped plate (61), and a third rotating shaft (64) is movably hinged at the right side of the lower layer of the Z-shaped plate (61), and a plurality of third springs (65) are elastically connected to the upper and lower sides of the inclined plate of the Z-shaped plate (61), and a rotating balance (66) is rotatably installed at the middle position of the inclined plate of the Z-shaped plate (61).

2. According to claim 1, a high-efficiency mechanical pressing device for new energy battery packaging is characterized in that: The top end of the third spring (65) on the left side is elastically connected to the top plate of the Z-shaped plate (61), and the top end of the third spring (65) on the right side is elastically connected to the bottom plate of the Z-shaped plate (61).

3. According to claim 2, a high-efficiency mechanical pressing device for new energy battery packaging is characterized in that: The supporting assembly (1) comprises a base (11), a plurality of rollers (12) are rotatably mounted at the middle of the base (11), the front rotating ends of the plurality of rollers (12) are fixedly connected to pulleys (13), the outer edges of the plurality of pulleys (13) are movably sleeved with belts (14), the rotating shaft of the right pulley (13) is fixedly connected to a motor (15), and the bottom of the motor (15) is fixedly connected to the base (11).

4. According to claim 3, a high-efficiency mechanical pressing device for new energy battery packaging is characterized in that: The two lateral positioning assemblies (2) comprise a fixing plate (21), the two fixing plates (21) being fixedly mounted on the front and rear sides of the base (11), two first hydraulic rods (22) being fixedly mounted on the top of the fixing plates (21), the telescopic ends of the two first hydraulic rods (22) being fixedly connected to a Y-shaped rod (23), and the front ends of the two Y-shaped rods (23) being rotatably mounted with two rubber wheels (24).

5. According to claim 4, a high-efficiency mechanical pressing device for new energy battery packaging is characterized in that: The two longitudinal positioning assemblies (3) comprise two groups of support seats (31), the two groups of support seats (31) are respectively fixedly mounted on the left and right sides of the base (11), a second hydraulic rod (32) is obliquely mounted on the top of the support seat (31), the telescopic end of the second hydraulic rod (32) is fixedly connected to a trapezoidal block (33), a first rotating shaft (34) is rotatably mounted on the right side of the middle of the trapezoidal block (33), the outer edge of the first rotating shaft (34) is elastically connected to a first spring (35), the other end of the first spring (35) is fixedly connected to a fixed shaft (36), and the fixed shaft (36) is fixedly mounted on the top of the support seat (31).

6. The high-efficiency mechanical pressing device for new energy battery packaging according to claim 3 is characterized in that: The moving assembly (4) comprises four longitudinal rods (41), the four longitudinal rods (41) are fixedly mounted on the top of the base (11), two screw rods (42) are fixedly mounted on the top of the four longitudinal rods (41), the outer edges of the two screw rods (42) are threadedly connected to the stepping motor (44), the outer edges of the two stepping motors (44) are fixedly mounted with a rectangular frame (43), and the inner sides of the two long sides of the rectangular frame (43) are provided with tracks (45).

7. The high-efficiency mechanical pressing device for new energy battery packaging according to claim 6 is characterized in that: The driving assembly (5) comprises four electric wheels (51), the four electric wheels (51) are movably clamped in the two tracks (45), the central axes of the four electric wheels (51) are fixedly connected with L-shaped blocks (52), the bottoms of the four L-shaped blocks (52) are fixedly connected with third hydraulic rods (53), the outer edges of the telescopic ends of the four third hydraulic rods (53) are movably sleeved with second springs (54), and the telescopic ends of the four third hydraulic rods (53) are movably hinged with the four U-shaped rods (62).

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