Metal shell welding machine for industrial manufacturing

Abstract

The invention relates to the technical field of welding equipment, in particular to a metal shell welding machine for industrial manufacturing, which comprises a base, a welding platform is formed on the upper end surface of the base, and a welding assembly is mounted on the welding platform and comprises a welding arm and a welding head; the longitudinal sliding group is mounted on the welding platform and comprises a longitudinal sliding plate; the transverse sliding group is mounted on the longitudinal sliding plate and comprises a transverse sliding plate; the clamping table is installed on the transverse sliding plate, the clamping table is provided with a clamping station, and a locking assembly is arranged on the clamping table; the locking assembly comprises a longitudinal locking piece, a transverse locking piece and a vertical locking piece, the longitudinal locking piece can slide in the longitudinal direction relative to the clamping station, the transverse locking piece can slide in the transverse direction relative to the clamping station, and the vertical locking piece can move in the vertical direction relative to the clamping station. The metal shell welding machine for industrial manufacturing is efficient and flexible in clamping, accurate in positioning, capable of achieving all-directional welding, safe and reliable.

Description

Technical Field

[0001] This invention relates to the technical field of welding equipment, and in particular to a metal casing welding machine for industrial manufacturing. Background Technology

[0002] In the industrial manufacturing sector, welding of metal casings is a crucial process, widely used in the production of machinery, electrical cabinets, and enclosure structures. As manufacturing moves towards intelligent and flexible operations, the market demands higher levels of automation, processing precision, and versatility for welding equipment in handling diverse product types and small batches. Traditional manual welding is not only inefficient and suffers from poor quality consistency, but also heavily relies on worker skills. Therefore, specialized equipment capable of automated clamping and welding has become an urgent need for the industry.

[0003] Currently, automated welding solutions on the market mainly fall into two categories. One type uses simple tooling fixtures with a fixed welding torch. While this type of equipment is lower in cost, its fixtures are often custom-designed and lack flexibility. When the workpiece size or shape changes slightly, the tooling needs to be replaced or adjusted, making it difficult to adapt to flexible production tasks. Furthermore, since the workpiece can usually only move in one or two directions, the welding torch lacks multi-degree-of-freedom adjustment capabilities, resulting in blind spots when welding complex three-dimensional contours or multi-angle welds, requiring subsequent manual welding, thus affecting overall efficiency and quality. The other type uses general-purpose six-axis industrial robots for welding. While highly flexible, the overall investment cost is huge, and it has high requirements for workspace and factory environment. In the mass production of small and medium-sized workpieces at high speeds, its efficiency is not fully realized, resulting in poor economic performance. In addition, many existing positioning slides often use rigid limits at the end of their stroke, which easily generate impact noise and mechanical damage, affecting the equipment's lifespan. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a highly efficient, flexible clamping, precise positioning, omnidirectional welding, and safe and reliable metal casing welding machine for industrial manufacturing.

[0005] The above-mentioned objective of this invention is achieved through the following technical solutions: A metal casing welding machine for industrial manufacturing includes: a base, a welding platform formed on the upper surface of the base, and a welding platform mounted on the welding platform; A welding assembly includes a welding arm and a welding head, wherein the welding arm is mounted on the welding platform and the welding head is mounted on the end of the welding arm away from the welding platform; A longitudinal sliding assembly, mounted on the welding platform, includes a longitudinal sliding plate that can slide relative to the welding platform; A transverse sliding assembly, mounted on the longitudinal sliding plate, includes a transverse sliding plate that can slide relative to the longitudinal sliding plate; A clamping table is installed on the transverse sliding plate. The clamping table has a groove to form a clamping station and a locking component is provided on the clamping table. The locking assembly includes a longitudinal locking member, a transverse locking member, and a vertical locking member. The longitudinal locking member is slidable relative to the clamping station in the longitudinal direction. The transverse locking member is slidable relative to the clamping station in the transverse direction. The vertical locking member is movable relative to the clamping station in the vertical direction.

[0006] In one specific embodiment of the metal casing welding machine for industrial manufacturing disclosed in this invention, the clamping platform is connected to the transverse sliding plate via several connecting columns, forming a placement space between the clamping platform and the transverse sliding plate. The clamping platform is fixedly equipped with a first locking drive, a second locking drive, and a third locking drive. The output end of the first locking drive is connected to the transverse locking member, the output end of the second locking drive is connected to the longitudinal locking member, and the output end of the third locking drive is connected to the vertical locking member.

[0007] As a specific embodiment of the metal shell welding machine for industrial manufacturing disclosed in this invention, a rotating seat is installed on the side wall of the clamping table, and a rotating rod is rotatably connected to the rotating seat. The output end of the third locking drive member is rotatably connected to the end of the vertical locking member away from the clamping table, and the end of the rotating rod away from the rotating seat is rotatably connected to the vertical locking member.

[0008] As a specific embodiment of the metal shell welding machine for industrial manufacturing disclosed in this invention, the clamping table has a limit groove on the side wall facing the longitudinal locking member and the side wall facing the transverse locking member, and a limit post is placed in the limit groove.

[0009] As a specific embodiment of the metal shell welding machine for industrial manufacturing disclosed in this invention, the limiting post is rotatably installed in the limiting groove, and the outer wall of the limiting post is made of permanent magnetic material.

[0010] As a specific embodiment of the metal shell welding machine for industrial manufacturing disclosed in this invention, the clamping table has a support platform, and the side wall of the support platform facing the longitudinal locking member and the side wall facing the transverse locking member are both provided with clearance grooves.

[0011] In one specific embodiment of the metal shell welding machine for industrial manufacturing disclosed in this invention, the side of the support platform that contacts the clamping platform is made of a rigid material, while the side of the support platform that is away from the clamping platform is made of a flexible material.

[0012] As a specific embodiment of the metal shell welding machine for industrial manufacturing disclosed in this invention, the longitudinal sliding group includes two sets of longitudinal guide rods, the lower end face of the longitudinal sliding plate is provided with a longitudinal sliding block that slides and cooperates with the longitudinal guide rods, the welding platform is also equipped with a longitudinal driving component, the output end of the longitudinal driving component is connected to the longitudinal sliding plate, the lower end face of the longitudinal sliding plate is equipped with a limiting plate, and the welding platform is also equipped with two sets of limiting components.

[0013] As a specific embodiment of the metal shell welding machine for industrial manufacturing disclosed in this invention, the transverse sliding group includes two sets of transverse guide rods, the lower end face of the transverse sliding plate is provided with a transverse sliding block that slides and cooperates with the transverse guide rods, the longitudinal sliding plate is equipped with a transverse driving member, the output end of the transverse driving member is connected to the transverse sliding plate, the lower end face of the transverse sliding plate is equipped with a limiting plate, and the longitudinal sliding plate is also equipped with two sets of limiting members.

[0014] As a specific embodiment of the metal shell welding machine for industrial manufacturing disclosed in this invention, the limiting member includes a fixed plate, through which a thrust member passes. The thrust member includes a thrust shell fixed to the fixed plate, a thrust rod slidably connected to the thrust shell, and the thrust rod is connected to the inner wall of the thrust shell by a spring. A thrust head is provided on the side of the thrust rod facing the limiting plate.

[0015] In summary, the present invention has at least one of the following beneficial technical effects: 1. The welding machine disclosed in this invention achieves efficient, flexible clamping and precise positioning of workpieces. The composite structure design of the support platform combined with the magnetic limiting column not only protects the workpiece surface but also simplifies the feeding process. 2. The welding machine disclosed in this invention can adapt to workpieces with certain dimensional tolerances through locking components in three directions, reducing the difficulty of operation and the requirements for initial accuracy. At the same time, the two-dimensional sliding platform ensures that any welding point on the workpiece can be accurately delivered to the welding head, greatly improving positioning accuracy and repeatability.

[0016] 3. The welding machine disclosed in this invention significantly improves the automation level, applicability and operational safety of welding processing. The multi-degree-of-freedom welding arm gives the welding head an adjustment capability with a near hemispherical working space, which can easily handle complex three-dimensional welds and realize flexible welding in all directions.

[0017] 4. At the same time, the modular sliding assembly, in conjunction with the buffer-type limiting component, not only achieves smooth and precise movement control, but also effectively absorbs impact energy through soft limiting, avoiding equipment damage caused by hard collisions, extending service life, and adapting to the welding requirements of various metal shells in industrial manufacturing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a specific embodiment of the welding of a metal shell for industrial manufacturing disclosed in this invention; Figure 2 This is a schematic diagram of the structure of a welding assembly according to a specific embodiment of the welding of a metal shell for industrial manufacturing disclosed in this invention; Figure 3 This is a schematic diagram of the longitudinal sliding assembly of a specific embodiment of the welding of a metal shell for industrial manufacturing disclosed in this invention; Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle; Figure 5 This is a schematic diagram of the transverse sliding assembly of a specific embodiment of the welding of a metal shell for industrial manufacturing disclosed in this invention; Figure 6 This is a schematic diagram of the structure of a clamping platform for welding metal shells for industrial manufacturing, as disclosed in this invention, according to a specific embodiment. Figure 7 This is a schematic diagram of the structure of a locking assembly for welding a metal casing for industrial manufacturing, as disclosed in this invention. Figure 1 ; Figure 8 This is a schematic diagram of the structure of a locking assembly for welding a metal casing for industrial manufacturing, as disclosed in this invention. Figure 2 .

[0019] Figure label: 1. Base; 11. Support legs; 12. Welding platform; 2. Welding assembly; 21. Welding arm; 22. Welding head; 211. Rotating seat; 212. Crank arm; 3. Longitudinal sliding assembly; 31. Longitudinal sliding plate; 32. Longitudinal guide rod; 33. Longitudinal sliding block; 34. Longitudinal drive component; 4. Lateral sliding assembly; 41. Lateral sliding plate; 42. Lateral guide rod; 43. Lateral sliding block; 44. Lateral drive component; 5. Limiting component; 51. Fixing plate; 52. Thrust shell; 53. Thrust rod; 54. Thrust head; 6. Clamping table; 61. Clamping station; 611. Limiting groove; 612. Limiting post; 62. Loading platform; 7. Locking assembly; 71. First locking drive; 72. Lateral locking component; 73. Second locking drive; 74. Longitudinal locking component; 75. Third locking drive; 76. Vertical locking component; 761. Buffer pad; 77. Rotating seat; 78. Rotating rod. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Please see Figures 1-8 The present invention discloses an industrial metal shell welding machine, which includes a base 1, a welding assembly 2, a longitudinal sliding assembly 3, a transverse sliding assembly 4, a limiting member 5, a clamping table 6, and a locking assembly 7.

[0022] The base 1 serves as the supporting structure for the entire equipment. It is rectangular in shape, with a flat welding platform 12 on its top. This welding platform 12 is preferably made of high-strength alloy steel, possessing excellent rigidity, wear resistance, and deformation resistance to ensure long-term stability. The base 1 has an internal cavity structure to centrally house the electrical control system, power module, and pneumatic components. Multiple wiring holes and access doors are provided externally for easy maintenance and management. The base 1 has height-adjustable support feet 11 at its four corners, which can be adjusted via threads to adapt to uneven ground, ensuring the machine's levelness during operation.

[0023] The welding platform 12 is typically made of high-strength metal to ensure stability and durability. The central area of ​​the welding platform 12 is used to mount the welding assembly 2, and the surface of the welding platform 12 is precision-machined to ensure smooth operation of all moving parts.

[0024] Welding assembly 2 includes a welding arm 21 and a welding head 22. The welding arm 21 is mounted on the welding platform 12, and its base is fixed on the central axis of the welding platform 12 to optimize the symmetry of the welding range. A cylindrical rotating seat 77211 is mounted on the base, and the rotating seat 77211 is rotatably connected to the base through a bearing structure to achieve horizontal rotation. Multiple sections of curved arms 212 are hinged sequentially on the rotating seat 77211, and adjacent curved arms 212 are connected by hinge shafts with locking function, allowing for swing adjustment within a specific plane. The end of the last curved arm 212 is connected to the welding head 22 through a quick-change interface. This interface is compatible with various welding terminals such as arc welding guns, laser welding heads, or inert gas shielded welding torches, allowing users to flexibly select the appropriate type based on the weld type, base material type, and process requirements. The multi-degree-of-freedom articulated arm 212 structure allows the welding head 22 to adjust its spatial coordinates and incident angle arbitrarily within a hemispherical working space centered on the base, making it particularly suitable for metal shell components with complex three-dimensional contours or multiple circumferential or vertical seams.

[0025] Multiple longitudinal sliding groups 3 can be configured and installed on the welding platform 12 to drive the workpiece to move longitudinally. Each longitudinal sliding group 3 includes a longitudinal sliding plate 31, two longitudinal guide rods 32, a longitudinal sliding block 33, a longitudinal drive component 34, and a limiting component 5. The two longitudinal guide rods 32 are fixedly installed on the upper end face of the welding platform 12 and arranged in parallel to provide stable guidance. The lower end face of the longitudinal sliding plate 31 is provided with a longitudinal sliding block 33 that matches the longitudinal guide rods 32. A linear bearing can be embedded inside the sliding block to ensure that the sliding plate moves smoothly along the guide rods. The longitudinal drive component 34 can be a servo motor or a cylinder. The longitudinal drive component 34 is installed on the welding platform 12, and its output end is connected to the longitudinal sliding plate 31 through a coupling or connecting rod to drive the sliding plate to move longitudinally. A limiting plate is also installed on the lower end face of the longitudinal sliding plate 31 to cooperate with the limiting component 5 to prevent the sliding plate from overtravel. Two sets of limiting components 5 are installed on the welding platform 12, located at both ends of the longitudinal stroke, to precisely control the movement range of the sliding plate.

[0026] The transverse sliding assembly 4 is mounted on the longitudinal sliding plate 31 and is used to drive the workpiece to move laterally. The transverse sliding assembly 4 includes a transverse sliding plate 41, two transverse guide rods 42, a transverse sliding block 43, a transverse drive component 44, and a limiting component 5. The two transverse guide rods 42 are fixedly mounted on the longitudinal sliding plate 31 and arranged in parallel to provide stable guidance. The lower end face of the transverse sliding plate 41 is provided with a transverse sliding block 43 that matches the transverse guide rods 42. The sliding block can also use a linear bearing to achieve smooth movement. The transverse drive component 44 can be a servo motor or a cylinder. The transverse drive component 44 is mounted on the longitudinal sliding plate 31, and its output end is connected to the transverse sliding plate 41 to drive the sliding plate to move laterally. A limiting plate is installed on the lower end face of the transverse sliding plate 41 to cooperate with the limiting component 5. Two sets of limiting components 5 are installed on the longitudinal sliding plate 31, located at both ends of the transverse stroke, to limit the range of movement of the transverse sliding plate 41.

[0027] The limiting component 5 is used to limit the travel of the longitudinal and lateral sliding assembly 4, ensuring safe movement. The limiting component 5 includes a fixed plate 51, a thrust shell 52, a thrust rod 53, a spring, and a thrust head 54. The fixed plate 51 is fixed to the welding platform 12 or the longitudinal sliding plate 31 by bolts. A thrust member is installed through the center of the fixed plate 51. The thrust member includes a thrust shell 52 fixed to the fixed plate 51. The thrust shell 52 has a hollow internal structure and is slidably connected to the thrust rod 53. One end of the thrust rod 53 is located inside the thrust shell 52 and is connected to the inner wall of the thrust shell 52 by a compression spring; the other end is provided with a thrust head 54. The thrust head 54 is usually made of wear-resistant materials such as nylon or rubber to reduce impact noise. When the limiting plate or lateral fiberboard on the sliding plate contacts the thrust head 54, the spring is compressed to absorb the impact force, thereby providing soft limiting and avoiding hardware damage.

[0028] The clamping table 6 is fixedly mounted on the transverse sliding plate 41 by several connecting columns, forming a placement space between the clamping table 6 and the transverse sliding plate 41 to accommodate the drive components and cables. A groove is formed in the center of the clamping table 6, creating a clamping station 61 for placing the workpiece to be welded. The clamping table 6 is equipped with a locking assembly 7, including a longitudinal locking member 74, a transverse locking member 72, and a vertical locking member 76, which limit and lock the workpiece from three directions respectively.

[0029] The longitudinal locking member 74 can slide relative to the clamping station 61 in the longitudinal direction to apply clamping force from the front and rear sides of the workpiece; the transverse locking member 72 can slide relative to the clamping station 61 in the transverse direction to apply clamping force from the left and right sides of the workpiece; the vertical locking member 76 can move relative to the clamping station 61 in the vertical direction to apply clamping force from above the workpiece.

[0030] Specifically, the clamping table 6 is fixedly equipped with a first locking drive component 71, a second locking drive component 73, and a third locking drive component 75. These drive components can be electric push rods or hydraulic cylinders. The output end of the first locking drive component 71 is connected to the lateral locking component 72, driving it to move laterally; the output end of the second locking drive component 73 is connected to the longitudinal locking component 74, driving it to move longitudinally; and the output end of the third locking drive component 75 is connected to the vertical locking component 76. Regarding the installation structure of the vertical locking component 76, a rotating seat 77211 is installed on the side wall of the clamping table 6, and the rotating seat 77211 is rotatably connected to a rotating rod 78 via a pin. The output end of the third locking drive 75 is rotatably connected to the end of the vertical locking member 76 away from the clamping table 6. Simultaneously, the end of the rotating rod 78 away from the rotating seat 77211 is also rotatably connected to the vertical locking member 76, forming a lever mechanism. This allows the vertical locking member 76 to move up and down in the vertical direction. This lifting method requires relatively short vertical displacement; that is, the output end of the third locking drive 75 only needs a small displacement to achieve a large angle of rotation of the vertical locking member. It should be understood that a buffer pad 761 can also be added to the side of the vertical locking member facing the clamping station 61 to protect the workpiece.

[0031] The clamping table 6 has limit grooves 611 on both its sidewall facing the longitudinal locking member 74 and its sidewall facing the transverse locking member 72. Limiting posts 612 are placed within the limit grooves 611. The limiting posts 612 are rotatably mounted within the limit grooves 611 via bearings. Their outer walls are made of permanent magnetic material, enabling them to attract metal workpieces and aid in initial positioning. The rotatable design of the limiting posts 612 reduces friction between the workpiece and the limiting posts 612, facilitating fine-tuning of the workpiece.

[0032] A support platform 62 is placed on the clamping table 6. Both the sidewalls of the support platform 62 facing the longitudinal locking member 74 and the sidewalls facing the transverse locking member 72 have clearance grooves to avoid interfering with the movement of the locking members. The side of the support platform 62 that contacts the clamping table 6 is made of a rigid material such as steel or aluminum alloy to provide stable support, while the side away from the clamping table 6 is made of a flexible material such as silicone or rubber to increase friction with the workpiece and prevent scratching the workpiece surface.

[0033] During welding, the workpiece to be welded is first placed on the support platform. Due to the flexible surface of the support platform and the magnetic attraction of the limiting posts 612, the workpiece can quickly come into contact with and adhere to the multiple limiting posts 612, achieving initial alignment. Subsequently, the locking assembly 7 is activated: the longitudinal locking member 74, the transverse locking member 72, and the vertical locking member 76 move toward the workpiece respectively, pressing and limiting the workpiece from three directions. This clamping method has low requirements for the placement accuracy of the workpiece and can accommodate workpieces with certain dimensional deviations.

[0034] After clamping, the workpiece position is adjusted via the longitudinal sliding assembly 3 and the transverse sliding assembly 4. The longitudinal drive component 34 and the transverse drive component 44 precisely drive the sliding plate to move according to control signals, positioning the workpiece at a predetermined position below the welding head 22. During welding, the welding arm 21 adjusts the posture of the welding head 22 through the rotation of the multi-section curved arm 212, achieving omnidirectional welding of the workpiece. The limiting component 5 ensures that the sliding assembly operates within a safe range, preventing collision accidents.

[0035] This embodiment achieves efficient workpiece clamping, precise positioning, and flexible welding through the above structural combination, and is suitable for welding various metal shells in industrial manufacturing.

[0036] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An industrial metal shell welding machine for manufacturing, characterized by, The utility model relates to a welding device, including: Base (1), the upper end face of base (1) forms welding platform (12), and welding platform (12) is installed with; Welding assembly (2) includes welding arm (21) and welding head (22), welding arm (21) is installed on welding platform (12), and the one end of welding arm (21) away from welding platform (12) is installed with welding head (22); Longitudinal sliding group (3) is installed on welding platform (12), and it includes longitudinal sliding plate (31) that can slide relative to welding platform (12); Transverse sliding group (4) is installed on longitudinal sliding plate (31), and it includes transverse sliding plate (41) that can slide relative to longitudinal sliding plate (31); Clamping table (6) is installed on transverse sliding plate (41), and clamping table (6) is opened with recess and forms clamping station (61), and clamping table (6) is equipped with locking assembly (7); Locking assembly (7) includes longitudinal locking piece (74), transverse locking piece (72) and vertical locking piece (76), longitudinal locking piece (74) includes the longitudinal direction sliding of relative to clamping station (61), transverse locking piece (72) includes the transverse direction sliding of relative to clamping station (61), and vertical locking piece (76) can move along vertical direction relative to clamping station (61).

2. The metal shell welding machine for industrial manufacturing according to claim 1, characterized in that: Clamping table (6) is connected with transverse sliding plate (41) through several connecting columns, and the space of placing is formed between clamping table (6) and transverse sliding plate (41), and clamping table (6) is fixedly installed with first locking drive (71), second locking drive (73) and third locking drive (75), the output end of first locking drive (71) is connected with transverse locking piece (72), the output end of second locking drive (73) is connected with longitudinal locking piece (74), and the output end of third locking drive (75) is connected with vertical locking piece (76).

3. The metal shell welding machine for industrial manufacturing according to claim 1, characterized in that: Rotary seat (77) (211) is installed on the side wall of clamping table (6), rotary seat (77) (211) is rotatably connected with rotary rod (78), the output end of third locking drive (75) and the one end of vertical locking piece (76) away from clamping table (6) are rotatably connected, and the one end of rotary rod (78) away from rotary seat (77) (211) is rotatably connected with vertical locking piece (76).

4. The metal shell welding machine for industrial manufacturing of claim 1, wherein: The side wall of clamping table (6) opposite longitudinal locking piece (74) and the side wall opposite transverse locking piece (72) are opened with limiting groove (611), and limiting groove (611) is placed with limiting column (612).

5. A metal shell welding machine for industrial manufacturing according to claim 4, characterized in that: Limiting column (612) is rotatably installed in limiting groove (611), and the outer wall of limiting column (612) is permanent magnetic material.

6. The metal shell welding machine for industrial manufacturing of claim 4, wherein: Clamping table (6) is placed with object receiving table (62), and the side wall of object receiving table (62) towards longitudinal locking piece (74) and the side wall of object receiving table (62) towards transverse locking piece (72) are all opened with avoiding groove.

7. A metal shell welding machine for industrial manufacturing according to claim 6, characterized in that: The side of the object supporting platform (62) in contact with the clamping platform (6) is made of hard material, and the side of the object supporting platform (62) away from the clamping platform (6) is made of flexible material.

8. The metal shell welding machine for industrial manufacturing of claim 1, wherein: The longitudinal sliding group (3) comprises two groups of longitudinal guide rods (32), the lower end surface of the longitudinal sliding plate (31) is provided with longitudinal sliding blocks (33) in sliding cooperation with the longitudinal guide rods (32), the welding platform (12) is further provided with longitudinal driving members (34), the output ends of the longitudinal driving members (34) are connected with the longitudinal sliding plate (31), the lower end surface of the longitudinal sliding plate (31) is provided with a limiting plate, and the welding platform (12) is further provided with two groups of limiting members (5).

9. The metal shell welding machine for industrial manufacturing of claim 1, wherein: The transverse sliding group (4) comprises two groups of transverse guide rods (42), the lower end surface of the transverse sliding plate (41) is provided with transverse sliding blocks (43) in sliding cooperation with the transverse guide rods (42), the longitudinal sliding plate (31) is provided with transverse driving members (44), the output ends of the transverse driving members (44) are connected with the transverse sliding plate (41), the lower end surface of the transverse sliding plate (41) is provided with a limiting plate, and the longitudinal sliding plate (31) is further provided with two groups of limiting members (5).

10. A metal shell welding machine for industrial manufacturing according to claim 8 or 9, characterized in that: The limiting member (5) comprises a fixed plate (51), a thrust member penetrates through the fixed plate (51), the thrust member comprises a thrust shell (52) fixed to the fixed plate (51), the thrust shell (52) is connected with a thrust rod (53) in sliding mode, the thrust rod (53) is connected with the inner wall of the thrust shell (52) through a spring, and a thrust head (54) is arranged on the side of the thrust rod (53) facing the limiting plate.

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