Multifunctional ladder upper and lower part 3D welding tool

Abstract

The utility model relates to the technical field of escalator machining, and discloses a multifunctional escalator upper and lower portion 3D welding tool which comprises a supporting frame, the upper end of the supporting frame is fixedly connected with a bottom plate, a 3D adjusting device is arranged on the upper surface of the bottom plate, and a positioning limiting device is arranged on the outer side of the 3D adjusting device. A bottom anti-impact device is arranged below the bottom plate, and escalator side plates are placed above the supporting frame. By means of the fixed plate, the transverse sliding bin, the movable plate, the threaded rod, the handle, the longitudinal sliding bin, the sliding support and the fixed support, when escalator assemblies with different lengths and widths are assembled, a main body frame of the escalator assemblies can be fixed and positioned, and therefore assembling of the upper portions and the lower portions of escalators with different widths, lengths and models is met; therefore, the full-coverage type 3D positioning effect is achieved, the cost input for manufacturing matched tools is saved, and tool elimination caused by production halt of products is reduced.

Description

3D welding fixture for upper and lower parts of multi-functional escalator Technical Field

[0001] This utility model relates to the field of escalator processing technology, specifically a multifunctional 3D welding fixture for the upper and lower parts of an escalator. Background Technology

[0002] An escalator is a mechanical device that facilitates people moving between floors. It is typically installed in public places or large buildings, including shopping malls, train stations, airports, and office buildings. It consists of a series of alternating walkways arranged in a continuous loop or straight line along a staircase track, allowing people to move along with the escalators.

[0003] In the current technology, the specifications and types of escalators in the market are becoming increasingly diverse and personalized. In order to meet the different needs of customers, when manufacturing the upper and lower parts of escalators of different specifications, it is necessary to equip them with corresponding 3D assembly tools, so as to facilitate the assembly of the internal parts of the escalator.

[0004] However, in actual use, the existing fixed splicing fixtures have fixed internal positioning columns, which can only assemble the upper and lower parts of a single model and specification of escalator. This cannot meet the increasingly diverse production needs of various types of escalator upper and lower parts in the market. The semi-fixed 3D assembly fixtures, on the other hand, have added transverse guide rails and can be adjusted laterally by screw rods on the base plate where one of the columns is located. This allows for the assembly of upper and lower parts of escalators of different widths and the same model, which is more versatile than the fixed 3D assembly fixtures. However, their application scope is still limited. Therefore, we propose a multi-functional 3D welding fixture for escalator upper and lower parts. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides a multifunctional 3D welding fixture for the upper and lower parts of an escalator, which solves the problem of increased investment in tooling costs, supporting facilities and equipment, and tooling placement space for manufacturing plants in order to equip the corresponding 3D assembly fixture.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a multifunctional escalator upper and lower D welding fixture, including a support frame, a base plate fixedly connected to the upper end of the support frame, a 3D adjustment device provided on the upper surface of the base plate, a positioning limiting device provided on the outside of the 3D adjustment device, a bottom anti-impact device provided below the base plate, and an escalator side plate placed above the support frame.

[0007] The 3D adjustment device includes a fixed plate, a transverse sliding chamber fixedly connected to the rear end of the fixed plate, a movable plate fixedly connected to the rear end of the transverse sliding chamber, a threaded rod threadedly connected to the inner surface of the movable plate, a handle fixedly connected to the rear end of the threaded rod, a longitudinal sliding chamber fixedly connected to the upper surface of the movable plate, a sliding bracket fixedly connected to the left side of the longitudinal sliding chamber, and fixed brackets provided on the upper surfaces of both the fixed plate and the movable plate.

[0008] Preferably, the positioning limiting device includes a positioning plate, with rubber pads fixedly connected to both the upper and lower ends of the positioning plate, and a set of contact blocks slidably connected to both the upper and lower ends of the positioning plate. A slide rod is in contact with the lower part of the inner surface of the positioning plate, and a connecting block is threadedly connected to the end of the slide rod away from the positioning plate. A slide rail is fixedly connected to the end of the positioning plate away from the connecting block, and a limit block is slidably connected to the inner surface of the slide rail. A stop block is fixedly connected to the end of the positioning plate away from the connecting block.

[0009] Preferably, the bottom impact-resistant device includes a hollow chamber, a rubber block is fixedly connected to the upper end of the hollow chamber, movable blocks are piston-connected to both the front and rear ends of the hollow chamber, a support rod is hinged to the upper end of the outer arc surface of the movable block, a piston plate is fixedly connected to the end of the movable block near the hollow chamber, and a connecting rod is piston-connected to the center of the inner surface of the movable block.

[0010] Preferably, the support frame is welded from multiple sets of H-beams, the upper surface of the base plate is provided with multiple sets of arc-shaped protrusions, the lower end of the fixing plate is fixedly connected to the support frame, and two sets of transverse sliding chambers are provided, with the two sets of transverse sliding chambers respectively located at the left and right ends of the support frame.

[0011] Preferably, a rectangular protrusion is provided on the lower surface of the movable plate, and a threaded groove is provided inside the rectangular protrusion. The front end of the threaded rod is rotatably connected to a support frame, and both the longitudinal sliding chamber and the transverse sliding chamber are multi-layered designs.

[0012] Preferably, there are two sets of longitudinal sliding chambers, and the two sets of longitudinal sliding chambers are located at the left ends of the movable plate and the fixed plate, respectively. There are multiple sets of fixed brackets, and the multiple sets of fixed brackets are located at the four corners of the area formed by the fixed plate and the movable plate.

[0013] Preferably, the inner surface of the positioning plate has through holes in the middle and lower parts, the inner surface of the rubber pad has a through rectangular hole, the end of the contact block near the rubber pad is a rectangular plane, the end of the contact block away from the rubber pad is a bevel, the outer arc surface of the contact block has a rectangular protrusion, the outer surface of the contact block is in contact with the limiting block, the end of the slide rod away from the positioning plate has a thread, the outer surface of the connecting block is fixedly connected to the fixing bracket, and the front end of the connecting block has a threaded groove.

[0014] Preferably, two sets of slide rails are provided, and the two sets of slide rails are located at the upper and lower ends of the positioning plate, respectively. The end of the limiting block near the positioning plate is provided with a rectangular groove. Two sets of limiting blocks are provided, and they are located at the upper and lower ends of the positioning plate, respectively. The near ends of the two sets of positioning plates are both set as arc-shaped and the arc surface is made of rubber. The far ends of the two sets of positioning plates are both set as inclined surfaces. The outer surface of the stop block is fixedly connected to the positioning plate. The outer surface of the stop block is elastically connected to the limiting block by a spring.

[0015] Preferably, the hollow chamber has through holes at both the front and rear ends, the upper end of the rubber block is fixedly connected to the base plate, the movable block has through holes at the center of its inner surface, the support rod is inclined as a whole, and the upper end of the support rod is fixedly connected to the base plate.

[0016] Preferably, the inner surface of the piston plate has multiple sets of through holes, the outer arc surface of the piston plate is connected to the hollow chamber piston, the hollow chamber stores fluid, the front and rear ends of the connecting rod are fixedly connected to the support frame, and two sets of movable blocks are provided, with the two sets of movable blocks symmetrically distributed about the center line of the hollow chamber as the axis of symmetry.

[0017] Working principle: During use, the escalator components to be assembled and welded are placed on the sliding and fixed supports using a suspension device. The distance between the front and rear supports and the total length of the left and right supports can be adjusted by pulling the sliding support and turning the handle. After adjustment, the suspension device is removed and the escalator frame is fixed using the positioning bolts on the upper end of the fixed and sliding supports. At the same time, the positioning limiting device on the upper end of the fixed support completes the positioning process of the escalator components.

[0018] Simultaneously, when the sliding rod inside the rotating positioning and limiting device moves the positioning plate toward the escalator side panel, the contact block extends out of the positioning plate and will preferentially contact the escalator side panel. At this time, the contact block will move toward the limiting block due to the contact with the escalator side panel, and the mutual contact of the inclined surfaces between the two will push the upper and lower sets of limiting blocks to move toward each other. The arc surface of the limiting block gradually restricts the rotation of the sliding rod, which means that the clamping process is about to be completed. In order to ensure that the positioning plate and the fixed bracket can form a stable support for the escalator side panel, the sliding rod can be rotated one more turn to ensure the tightness of the contact between the two. At the same time, the obstruction of the sliding rod by the limiting block makes it difficult for people to over-clamp the escalator side panel by rotating the sliding rod.

[0019] Furthermore, when operators are assembling and welding components above the base plate, to prevent the center of the base plate from sinking when stepped on, when the center of the base plate tends to move downwards, the rubber pad will first squeeze the hollow chamber below. The compression deformation of the rubber pad will provide initial buffering of the impact force above and provide support for the base plate. At the same time, during the sinking process of the base plate, the support rods on both sides will also rotate and push the two sets of movable blocks at the lower end to move towards each other. This allows the springs on the outside of the movable blocks to be stretched, thereby providing secondary buffering of the impact force through their elastic deformation. While the movable blocks are moving, the piston plate will also be driven to move into the hollow chamber, thereby squeezing the damping fluid stored inside the hollow chamber. Since the piston plate has through holes inside, the piston plate will not be completely blocked from moving, but only its movement will be hindered. Thus, the resistance generated by the piston plate moving in the damping fluid can form motion damping of the base plate. In this way, the damping and buffering method can complete the buffering and shock absorption effect on the upper base plate.

[0020] This utility model provides a multifunctional 3D welding fixture for the upper and lower parts of an escalator. It has the following beneficial effects:

[0021] 1. This utility model, through the setting of a fixed plate, a transverse sliding compartment, a movable plate, a threaded rod, a handle, a longitudinal sliding compartment, a sliding bracket, and a fixed bracket, can fix and position the main frame of escalator components of different lengths and widths during assembly. This satisfies the needs of escalator assembly of different widths and different lengths, achieving a full-coverage 3D positioning effect. This saves on the cost of manufacturing matching tooling and reduces the obsolescence of tooling due to product discontinuation.

[0022] 2. This utility model, through the setting of contact blocks, rubber pads, positioning plates, sliding rods, connecting blocks, limiting blocks, slide rails, and stops, can avoid the clamping state of being too tight or too loose due to manual twisting of the threaded rod when fixing the outer components of the escalator using a fixed bracket. This makes the surface of the escalator components less prone to scratches caused by rigid collisions when they are positioned. At the same time, the movement position of the limiting blocks can also allow people to roughly judge whether the clamping force is appropriate.

[0023] 3. This utility model, through the setting of rubber blocks, support rods, connecting rods, movable blocks, hollow chambers, and piston plates, can buffer and dampen the impact force on the base plate when an operator steps on it or when components fall onto it, thereby improving the service life of the base plate and the overall support strength of the device, and thus reducing the maintenance costs required during the use of the device. Attached Figure Description

[0024] Figure 1 is a perspective view of this utility model;

[0025] Figure 2 is a bottom view of this utility model;

[0026] Figure 3 is a schematic diagram of the upper structure of this utility model;

[0027] Figure 4 is a schematic diagram of the front structure of the positioning plate of this utility model;

[0028] Figure 5 is a schematic diagram of the back structure of the positioning plate of this utility model;

[0029] Figure 6 is a schematic diagram of the structure at the limiting block of this utility model;

[0030] Figure 7 is a schematic diagram of the bottom impact-resistant device of this utility model;

[0031] Figure 8 is a schematic diagram of the cross-section of the hollow compartment of this utility model.

[0032] The components include: 1. Support frame; 2. 3D adjustment device; 3. Positioning limiting device; 4. Bottom impact resistance device; 5. Escalator side plate; 6. Base plate; 201. Fixed plate; 202. Lateral sliding compartment; 203. Movable plate; 204. Threaded rod; 205. Handle; 206. Longitudinal sliding compartment; 207. Sliding bracket; 208. Fixed bracket; 301. Contact block; 302. Rubber pad; 303. Positioning plate; 304. Slide rod; 305. Connecting block; 306. Limiting block; 307. Slide rail; 308. Stop block; 401. Rubber block; 402. Support rod; 403. Connecting rod; 404. Movable block; 405. Hollow compartment; 406. Piston plate. Detailed Implementation

[0033] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] Please refer to Figures 1-3. This utility model embodiment provides a multifunctional escalator upper and lower 3D welding fixture, including a support frame 1, a base plate 6 fixedly connected to the upper end of the support frame 1, a 3D adjustment device 2 provided on the upper surface of the base plate 6, a positioning limiting device 3 provided on the outside of the 3D adjustment device 2, a bottom anti-impact device 4 provided below the base plate 6, and an escalator side plate 5 placed above the support frame 1.

[0035] The 3D adjustment device 2 includes a fixed plate 201. A transverse sliding chamber 202 is fixedly connected to the rear end of the fixed plate 201. A movable plate 203 is fixedly connected to the rear end of the transverse sliding chamber 202. A threaded rod 204 is threadedly connected to the inner surface of the movable plate 203. A handle 205 is fixedly connected to the rear end of the threaded rod 204. A longitudinal sliding chamber 206 is fixedly connected to the upper surface of the movable plate 203. A sliding bracket 207 is fixedly connected to the left side of the longitudinal sliding chamber 206. Fixed brackets 208 are provided on the upper surfaces of both the fixed plate 201 and the movable plate 203. Positioning bolts are provided at the upper ends of both the fixed brackets 208 and the sliding brackets 207.

[0036] The support frame 1 is welded from multiple sets of H-beams to form a hollow frame in the shape of a "U". Multiple sets of arc-shaped protrusions are provided on the upper surface of the base plate 6, increasing the friction between the assembly personnel and the base plate 6 when moving above it. The lower end of the fixed plate 201 is fixedly connected to the support frame 1. Two sets of transverse sliding chambers 202 are provided, located at the left and right ends of the support frame 1 respectively. This allows the left and right sides of the movable plate 203 to slide synchronously when the handle 205 is turned. A rectangular protrusion is provided on the lower surface of the movable plate 203, and a threaded groove is formed inside the rectangular protrusion, allowing the movable plate 203 to engage with the threaded rod 20. The four components form a threaded connection. The front end of the threaded rod 204 is rotatably connected to the support frame 1, so that the threaded rod 204 will not interfere with the support frame 1 when it rotates. Both the longitudinal sliding chamber 206 and the transverse sliding chamber 202 are multi-layered designs, so they can extend a long distance. There are two sets of longitudinal sliding chambers 206, and the two sets of longitudinal sliding chambers 206 are located at the left end of the movable plate 203 and the fixed plate 201, respectively. This allows the sliding bracket 207 to adapt to escalator frame components of different lengths by extending. There are multiple sets of fixed brackets 208, and the multiple sets of fixed brackets 208 are located at the four corners of the area formed by the fixed plate 201 and the movable plate 203.

[0037] Please refer to Figures 2 and 4-6. The positioning limiting device 3 includes a positioning plate 303. Rubber pads 302 are fixedly connected to both the upper and lower ends of the positioning plate 303. A set of contact blocks 301 are slidably connected to both the upper and lower ends of the positioning plate 303. A slide rod 304 is in contact with the lower part of the inner surface of the positioning plate 303. A connecting block 305 is threadedly connected to the end of the slide rod 304 away from the positioning plate 303. A slide rail 307 is fixedly connected to the end of the positioning plate 303 away from the connecting block 305. A limit block 306 is slidably connected to the inner surface of the slide rail 307. A stop block 308 is fixedly connected to the end of the positioning plate 303 away from the connecting block 305.

[0038] The inner surface of the positioning plate 303 has through holes at its lower and middle parts, allowing the contact block 301 and slide rod 304 to move within it. The inner surface of the rubber pad 302 has a through rectangular hole, preventing the rubber pad 302 from interfering with the movement of the contact block 301. The end of the contact block 301 near the rubber pad 302 is a rectangular plane, while the end away from the rubber pad 302 is a bevel. This allows it to be pushed vertically when it contacts the limit block 306, which is also beveled. The outer arc surface of the contact block 301 has a rectangular protrusion to prevent it from coming out of the positioning plate 303 during movement. The outer surface of the contact block 301 contacts the limit block 306. The end of the slide rod 304 away from the positioning plate 303 is threaded, allowing it to form a threaded connection with the connecting block 305. The outer surface of the connecting block 305 is fixedly connected to the fixing bracket 208. The front end of the connecting block 305... The slide rail 307 has a threaded groove and is provided in two sets, with the two sets of slide rail 307 located at the upper and lower ends of the positioning plate 303, respectively. The limiting block 306 has a rectangular groove at the end near the positioning plate 303, which can accommodate the spring located inside it. The limiting block 306 is provided in two sets, located at the upper and lower ends of the positioning plate 303, respectively. Therefore, the movement of the slide rod 304 can be restricted by clamping it from the upper and lower sides. The near ends of the two sets of positioning plates 303 are both set as arc-shaped and the arc surface is made of rubber. The rubber surface has a large coefficient of friction, thereby restricting the movement of the slide rod 304 through friction. The far ends of the two sets of positioning plates 303 are both set as inclined surfaces. The outer surface of the stop block 308 is fixedly connected to the positioning plate 303. The outer surface of the stop block 308 is elastically connected to the limiting block 306 through the spring. Therefore, when it is not necessary to limit the position of the slide rod 304, the spring can drive the limiting blocks 306 at the upper and lower ends to reset, and the movement of the limiting blocks 306 can drive the contact blocks 301 at the upper and lower ends to reset.

[0039] Please refer to Figures 2 and 7-8. The bottom impact-resistant device 4 includes a hollow chamber 405. A rubber block 401 is fixedly connected to the upper end of the hollow chamber 405. Movable blocks 404 are piston-connected to both the front and rear ends of the hollow chamber 405. A support rod 402 is hinged to the upper end of the outer arc surface of the movable block 404. A piston plate 406 is fixedly connected to the end of the movable block 404 near the hollow chamber 405. A connecting rod 403 is piston-connected to the center of the inner surface of the movable block 404.

[0040] The hollow chamber 405 has through holes at both its front and rear ends, allowing the movable block 404 to slide inside. The upper end of the rubber block 401 is fixedly connected to the base plate 6, thus limiting the position of the hollow chamber 405. This rubber block 401 is also a shock-absorbing rubber, providing initial shock absorption to the base plate 6 when compressed. The movable block 404 has a through hole at its inner center, allowing it to slide on the outer arc surface of the connecting rod 403. The support rod 402 is inclined, allowing it to rotate and slide the movable block 404 when compressed from above. The upper end of the support rod 402 is fixedly connected to the base plate 6. The inner surface of the piston plate 406 has multiple through holes, so that when the piston plate 406 moves inside the damping fluid, it will not be completely blocked by the damping fluid, but only its movement will be hindered by the damping fluid. The outer arc surface of the piston plate 406 is connected to the hollow chamber 405. The hollow chamber 405 stores fluid, which is the damping fluid in the prior art. Therefore, the piston plate 406 experiences greater resistance when it moves inside, thereby reducing vibration through damping. The front and rear ends of the connecting rod 403 are fixedly connected to the support frame 1, thereby ensuring the overall stability of the bottom impact-resistant device 4. Two sets of movable blocks 404 are provided, and the two sets of movable blocks 404 are symmetrically distributed about the center line of the hollow chamber 405.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multifunctional 3D welding fixture for the upper and lower parts of an escalator, comprising a support frame (1), characterized in that, The upper end of the support frame (1) is fixedly connected to a base plate (6). A 3D adjustment device (2) is provided on the upper surface of the base plate (6). A positioning limiting device (3) is provided on the outside of the 3D adjustment device (2). A bottom anti-impact device (4) is provided below the base plate (6). An escalator side plate (5) is placed on top of the support frame (1). The 3D adjustment device (2) includes a fixed plate (201). A transverse sliding chamber (202) is fixedly connected to the rear end of the fixed plate (201). A movable [unclear] is fixedly connected to the rear end of the transverse sliding chamber (202). The movable plate (203) has a threaded rod (204) threadedly connected to its inner surface. A handle (205) is fixedly connected to the rear end of the threaded rod (204). A longitudinal sliding chamber (206) is fixedly connected to the upper surface of the movable plate (203). A sliding bracket (207) is fixedly connected to the left side of the longitudinal sliding chamber (206). Fixed brackets (208) are provided on the upper surfaces of both the fixed plate (201) and the movable plate (203). The positioning limiting device (3) includes a positioning plate (303). The upper surface of the positioning plate (303) has a threaded rod (204) threadedly connected to its inner surface. A handle (205) is fixedly connected to the rear end of the threaded rod (204). A longitudinal sliding chamber (206) is fixedly connected to the upper surface of the movable plate (203). A sliding bracket (207) is fixedly connected to the left side of the longitudinal sliding chamber (206). Fixed brackets (208) are provided on the upper surfaces of both the fixed plate (201) and the movable plate (203). Both ends of the positioning plate (303) are fixedly connected with rubber pads (302). Both ends of the positioning plate (303) are slidably connected with a set of contact blocks (301). The lower part of the inner surface of the positioning plate (303) contacts a slide rod (304). The end of the slide rod (304) away from the positioning plate (303) is threadedly connected to a connecting block (305). The end of the positioning plate (303) away from the connecting block (305) is fixedly connected to a slide rail (307). The inner surface of the slide rail (307) is slidably connected to a limit block (306). The end of the positioning plate (303) away from the connecting block (301) is fixedly connected to a slide rail (307). 5) One end is fixedly connected to a stop block (308); the bottom impact-resistant device (4) includes a hollow chamber (405), the upper end of the hollow chamber (405) is fixedly connected to a rubber block (401), both the front and rear ends of the hollow chamber (405) are piston connected to movable blocks (404), the upper end of the outer arc surface of the movable block (404) is hinged to a support rod (402), the end of the movable block (404) near the hollow chamber (405) is fixedly connected to a piston plate (406), and the center of the inner surface of the movable block (404) is piston connected to a connecting rod (403).

2. The multifunctional escalator upper and lower 3D welding fixture according to claim 1, characterized in that, The support frame (1) is welded from multiple sets of H steel. Multiple sets of arc-shaped protrusions are provided on the upper surface of the base plate (6). The lower end of the fixing plate (201) is fixedly connected to the support frame (1). Two sets of transverse sliding chambers (202) are provided, and the two sets of transverse sliding chambers (202) are respectively located at the left and right ends of the support frame (1).

3. The multifunctional escalator upper and lower 3D welding fixture according to claim 1, characterized in that, The lower surface of the movable plate (203) is provided with a rectangular protrusion, and the inside of the rectangular protrusion is provided with a threaded groove. The front end of the threaded rod (204) is rotatably connected to the support frame (1). The longitudinal sliding chamber (206) and the transverse sliding chamber (202) are both multi-layered designs.

4. The multifunctional escalator upper and lower 3D welding fixture according to claim 1, characterized in that, The longitudinal sliding chamber (206) is provided in two sets, and the two sets of longitudinal sliding chambers (206) are respectively located at the left end of the movable plate (203) and the fixed plate (201). The fixed bracket (208) is provided in multiple sets, and the multiple sets of fixed brackets (208) are respectively located at the four corners of the area formed by the fixed plate (201) and the movable plate (203).

5. The multifunctional escalator upper and lower 3D welding fixture according to claim 1, characterized in that, The positioning plate (303) has through holes in the middle and lower parts of its inner surface. The rubber pad (302) has through rectangular holes in its inner surface. The contact block (301) has a rectangular plane at one end near the rubber pad (302) and an inclined plane at the other end away from the rubber pad (302). The outer arc surface of the contact block (301) has a rectangular protrusion. The outer surface of the contact block (301) is in contact with the limiting block (306). The sliding rod (304) has a thread at one end away from the positioning plate (303). The outer surface of the connecting block (305) is fixedly connected to the fixed bracket (208). The front end of the connecting block (305) has a threaded groove.

6. The multifunctional escalator upper and lower 3D welding fixture according to claim 1, characterized in that, Two sets of slide rails (307) are provided, and the two sets of slide rails (307) are located at the upper and lower ends of the positioning plate (303) respectively. The limiting block (306) has a rectangular groove at one end near the positioning plate (303). Two sets of limiting blocks (306) are provided, and they are located at the upper and lower ends of the positioning plate (303) respectively. The near ends of the two sets of positioning plates (303) are both set as arc-shaped and the arc surface is made of rubber. The far ends of the two sets of positioning plates (303) are both set as inclined surfaces. The outer surface of the stop block (308) is fixedly connected to the positioning plate (303). The outer surface of the stop block (308) is elastically connected to the limiting block (306) by a spring.

7. The multifunctional escalator upper and lower 3D welding fixture according to claim 1, characterized in that, The hollow chamber (405) has through holes at both the front and rear ends. The upper end of the rubber block (401) is fixedly connected to the base plate (6). The center of the inner surface of the movable block (404) has through holes. The support rod (402) is set in an inclined shape. The upper end of the support rod (402) is fixedly connected to the base plate (6).

8. The multifunctional escalator upper and lower 3D welding fixture according to claim 1, characterized in that, The inner surface of the piston plate (406) has multiple through holes. The outer arc surface of the piston plate (406) is connected to the piston of the hollow chamber (405). The hollow chamber (405) stores fluid. The front and rear ends of the connecting rod (403) are fixedly connected to the support frame (1). There are two sets of movable blocks (404), and the two sets of movable blocks (404) are symmetrically distributed with the center line of the hollow chamber (405) as the axis of symmetry.

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