Elevator sill profile welding tool

Abstract

The invention discloses an elevator sill profile welding tool, and relates to the field of elevator equipment manufacturing, the elevator sill profile welding tool comprises a base, an elevator sill profile positioning table is arranged in the middle of the base, a head abutting device is arranged at one end of the elevator sill profile positioning table, and a tail abutting device is arranged at the other end of the elevator sill profile positioning table; a middle clamp tool is arranged on the side face of the elevator sill profile positioning table. The middle clamp tool comprises a lifting structure connected with the base and a lifting plate connected with the tail end of an output shaft of the lifting structure. The tail abutting device, the middle clamp tool and the head abutting device are arranged and used in cooperation, the position of the elevator sill profile is fixed, meanwhile, key functional components are conveyed to the head welding position and the tail welding position of the profile, the key functional components are positioned, and the welding efficiency of the elevator sill profile is improved. Therefore, the key functional component and the elevator sill profile can be stably welded, and the welding quality and the welding efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of elevator equipment manufacturing, and in particular to a welding fixture for elevator sill profiles. Background Technology

[0002] Elevator sill profiles are the core load-bearing and guiding components of elevator door systems. They serve as the "track base" for the opening and closing of elevator car doors and landing doors (fixed doors at the elevator entrance on each floor), directly affecting the smoothness, sealing, and safety of elevator door opening and closing. They are mainly installed in two key locations:

[0003] Car sill: Fixed to the bottom of the car door, the slider / roller at the bottom of the car door slides along its groove to ensure that the car door is aligned with the edge of the car;

[0004] Landing door sill: Fixed to the floor at the entrance of the elevator lobby on each floor (embedded in the floor or raised), the bottom of the landing door slides along its groove, and at the same time forms a "connection gap" with the car sill to prevent people or objects from getting stuck.

[0005] In the existing technology, the basic form (extrusion molding) of the sill profile cannot meet the requirements of "installation and fixing, structural reinforcement and functional adaptation" of the elevator door system. It is necessary to use welding process to connect the "extrusion profile body" and "key functional accessories" (such as nut seat and reinforcing rib) into one piece to finally realize the complete function of the sill.

[0006] Currently, the welding of elevator sill profiles in the industry mainly relies on automated welding equipment (such as welding robots) to achieve efficient and stable processing. The effective operation of automated welding equipment depends heavily on the precise positioning of the elevator sill profile and key functional accessories by the welding fixture. Only by ensuring that the relative positions of the profile body and accessories (such as nut seats and reinforcing ribs) strictly meet the design requirements can problems such as dimensional deviations and weld seam offsets after welding be avoided, thus ensuring the final performance of the sill.

[0007] Existing welding positioning fixtures for sill profiles mainly include the following types: Fixed fixtures with limit grooves and quick clamps: The limit plate on the fixed plate achieves the initial positioning of the profile, and the quick clamp completes the fixation; Adjustable slide rail-slide seat clamping fixtures: The welding fixture is slidably installed using the slot on the crossbeam, and then multi-point synchronous top clamping is achieved through the slide seat on the slide rail; Rotary angle adjustment fixtures: For long profiles or scenarios requiring angle welding, a design with a rotating connection between the left and right plates is adopted, and the angle adjustment component is used to achieve angle limiting to prevent the welding end from tilting up, which is suitable for welding irregular profiles; Lever-type telescopic positioning fixtures: The telescopic positioning column is achieved through the lever mechanism (pedal, lever, positioning column) on the base plate, and the longitudinal channel steel fixation area is used to complete the precise positioning of the profile. Although the aforementioned tooling improves welding efficiency and ease of operation to some extent, they all share a common defect: their design focuses only on positioning the main body of the sill profile (such as stainless steel square tubes and profile channels), without considering the positioning constraints of key functional accessories (such as nut seats, reinforcing ribs, adjusting blocks, etc.). This results in the need for an additional "secondary positioning" operation during the welding process, which reduces welding efficiency and makes it difficult to ensure the relative positional accuracy of the accessories and the profile.

[0008] Based on this, this application proposes a welding fixture for elevator sill profiles. Summary of the Invention

[0009] This application proposes a welding fixture for elevator sill profiles, which has the following advantages: by using a tail abutment device, a middle clamping fixture, and a head abutment device in combination, the elevator sill profile is fixed in position while key functional components are delivered to the head and tail welding positions of the profile and positioned, so that the key functional components and the elevator sill profile can be stably welded, improving welding quality and welding efficiency, and solving the technical problems mentioned in the background art.

[0010] To achieve the above objectives, this application adopts the following technical solution: a welding fixture for elevator sill profiles, including a base, an elevator sill profile positioning platform is provided in the middle of the base, a head abutment device is provided at one end of the elevator sill profile positioning platform, a tail abutment device is provided at the other end of the elevator sill profile positioning platform, and a middle clamping fixture is provided on the side of the elevator sill profile positioning platform.

[0011] The central fixture includes a lifting structure connected to the base, a lifting plate connected to the end of the output shaft of the lifting structure, a fixed seat movably connected to the top of the lifting plate, a rotating horizontal plate movably connected to the fixed seat, and a first accessory support block connected to the rotating horizontal plate; a first linear movement structure is provided on one side of the top of the lifting plate, the fixed seat is driven to move linearly through the first linear movement structure, two adjacent fixed seats are connected by a connecting rod, a driving structure is provided on the fixed seat, and the rotating horizontal plate is driven to rotate through the driving structure; the bottom of the lifting plate is symmetrically provided with push blocks adapted to the elevator sill profile.

[0012] Preferably, the head abutment device includes a second linear moving structure connected to the base, the output shaft end of the second linear moving structure is connected to an abutment plate adapted to the elevator sill profile, and the abutment plate is provided with second accessory support blocks evenly arranged on the side near the elevator sill profile positioning platform.

[0013] Preferably, both the second accessory support block and the first accessory support block are provided with magnetic attraction points on their tops, and both the second accessory support block and the first accessory support block are provided with positioning protrusions on one side that are adapted to the key functional accessories of the elevator sill profile.

[0014] Preferably, the tail abutment device includes a tail end positioning platform connected to the base, and the top of the tail end positioning platform is provided with a plurality of magnetic attraction points.

[0015] Preferably, the elevator sill profile positioning platform includes a plurality of evenly distributed positioning components. Each positioning component includes a fixed plate connected to a base. The fixed plate is provided with a plurality of limiting groups adapted to the elevator sill profile. Each limiting group includes a roller movably connected to the fixed plate and a limiting block fixedly connected to the fixed plate. The distance between the roller and the limiting block is adapted to the elevator sill profile.

[0016] Preferably, the tail end positioning platform is L-shaped, the top of the horizontal end of the tail end positioning platform is at the same height as the top of the fixing plate, and the vertical end of the tail end positioning platform is provided with another magnetic attraction point.

[0017] Preferably, the top of the base is provided with a groove, and the horizontal end of the push block is adapted to the groove. When the first accessory support block is located in the inner cavity of the elevator sill profile, the horizontal end of the push block is located below the elevator sill profile. When the bottom of the first accessory support block is at the same height as the top of the elevator sill profile, the top of the push block is at the same height as the top of the fixing plate.

[0018] Preferably, magnetic blocks are provided on both sides of the fixed seat, and the rotating cross plate is magnetically attracted to the magnetic blocks. The number of fixed seats is the same as the number of key functional accessories provided in the middle of the elevator sill profile.

[0019] Preferably, the first accessory support block is L-shaped, the horizontal end of the first accessory support block is adapted to the inner cavity of the elevator sill profile, the rotating horizontal plate is located above the horizontal end of the first accessory support block, and the vertical end of the first accessory support block is detachably connected to the rotating horizontal plate.

[0020] Preferably, the top of the lifting plate is provided with a sliding groove, and a slider is movably connected to the inner cavity of the sliding groove. The slider is connected to the bottom of the fixed base.

[0021] In summary, the present invention has the following beneficial effects:

[0022] 1. By using a combination of tail abutment device, middle clamping fixture, and head abutment device, the position of the elevator sill profile is fixed while key functional components are delivered to the head and tail welding positions of the profile. The key functional components are also positioned to ensure stable welding between the key functional components and the elevator sill profile, thereby improving welding quality and efficiency.

[0023] 2. The central clamping fixture can be used to position and fix the key functional components in the middle of the elevator sill profile, and can also smoothly lift the welded whole sill profile away from the elevator sill profile positioning platform, thereby significantly simplifying the disassembly operation of the profile and greatly improving the tooling turnover efficiency and production continuity.

[0024] 3. By setting the positioning components, the limit block serves as a fixed reference, which can strictly limit the position of the elevator sill profile and prevent the profile from shifting during the welding process; the rollers replace rigid contact with rolling contact, which reduces the friction between the elevator sill profile and the positioning components, enabling the elevator sill profile to move quickly and facilitating rapid positioning of the elevator sill profile. Attached Figure Description

[0025] Figure 1 This is a top view schematic diagram of a welding fixture for elevator sill profiles proposed in this invention;

[0026] Figure 2 yes Figure 1 Use diagrams;

[0027] Figure 3 yes Figure 2 back;

[0028] Figure 4 This is an exploded schematic diagram of the fixed base and rotating horizontal plate of the present invention;

[0029] Figure 5 This is a schematic diagram of the central fixture tooling;

[0030] Figure 6 This is a schematic diagram of the head-mounted contact device.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Base; 2. Fixing plate; 3. Limiting block; 4. Roller; 5. Second linear movement structure; 6. Abutment plate; 7. Second accessory support block; 8. Support frame; 9. Lifting structure; 10. Lifting plate; 11. First linear movement structure; 12. Slide groove; 13. Fixing seat; 14. Rotating shaft; 15. Magnetic block; 16. Drive structure; 17. Rotating horizontal plate; 18. First accessory support block; 19. Magnetic point; 20. Positioning protrusion; 21. Groove; 22. Push block; 23. Tail end positioning platform; 24. Slider; 25. Connecting rod. Detailed Implementation

[0033] like Figures 1 to 6 A welding fixture for elevator sill profiles includes a base 1. An elevator sill profile positioning platform is located in the center of the base 1. The positioning platform includes several evenly distributed positioning components. Each positioning component includes a fixed plate 2 connected to the base 1. The fixed plate 2 has several limiting groups adapted to the elevator sill profile. Each limiting group includes a roller 4 movably connected to the fixed plate 2 and a limiting block 3 fixedly connected to the fixed plate 2. The distance between the roller 4 and the limiting block 3 is adapted to the elevator sill profile. Both the roller 4 and the limiting block 3 are detachably connected to the fixed plate 2. Through the positioning components, the limiting block 3 serves as a fixed reference, strictly limiting the position of the elevator sill profile and preventing profile displacement during welding. The roller 4 uses rolling contact instead of rigid contact, reducing the friction between the elevator sill profile and the positioning components, allowing for rapid movement of the elevator sill profile and facilitating rapid positioning.

[0034] One end of the elevator sill profile positioning platform is equipped with a head abutment device. The head abutment device includes a second linear moving structure 5 connected to the base 1. The output shaft end of the second linear moving structure 5 is connected to an abutment plate 6 adapted to the elevator sill profile. The length of the abutment plate 6 is not less than the length of the fixed plate 2. The length of the abutment plate 6 can be set according to requirements and is not limited here. When the second linear moving structure 5 is working, it can drive the abutment plate 6 connected to it to move. With the abutment plate 6, a pushing force can be applied to the profile positioned by the positioning component, thereby achieving the purpose of synchronously adjusting the position of multiple profiles.

[0035] The abutment plate 6 is evenly provided with second accessory support blocks 7 on one side near the elevator sill profile positioning platform. The top of the second accessory support block 7 is provided with magnetic attraction points 19. Using the magnetic attraction points 19, key functional accessories such as reinforcing ribs that are compatible with the elevator sill profile can be fixed on the second accessory support block 7. One side of the second accessory support block 7 is provided with positioning protrusions 20 that are compatible with the key functional accessories of the elevator sill profile. The positioning protrusions 20 can be used to position key functional accessories such as reinforcing ribs, improve the fixing efficiency of key functional accessories, and ensure that the positions of key functional accessories of the same type on the second accessory support block 7 are consistent, thus ensuring the welding quality of the elevator sill profile.

[0036] As described above, the head abutment device uses magnetic attraction point 19 to fix key functional accessories. While positioning the profile, the head abutment device simultaneously locks and fixes the key functional accessories (such as nut seats, reinforcing ribs, etc.), integrating the original secondary positioning operation of accessories into the overall positioning process. This eliminates the intermediate step of adjusting the position of accessories separately, effectively reducing positioning time and operation steps, and thus improving the welding efficiency of elevator sill profiles.

[0037] The other end of the elevator sill profile positioning platform is equipped with a tail abutment device. The tail abutment device includes a tail end positioning platform 23 connected to the base 1. The top of the tail end positioning platform 23 is provided with several magnetic attraction points 19. The tail end positioning platform 23 is L-shaped. The top of the horizontal end of the tail end positioning platform 23 is at the same height as the top of the fixing plate 2. The vertical end of the tail end positioning platform 23 is provided with another magnetic attraction point 19. The tail end positioning platform 23 is used to abut and position the tail end of the sill profile. The other magnetic attraction point 19 provided on the tail end positioning platform 23 can attract and hold key functional components such as reinforcing ribs used to reinforce the tail end of the profile, so that the key functional components at the tail end can remain stable during welding.

[0038] The coordinated action of the head abutment device and the tail abutment device enables the clamping and positioning of both ends of the profile, and delivers the key functional components to the head welding position and the tail welding position of the profile, and positions the key functional components so that the key functional components can be stably welded to the elevator sill profile, thereby improving the welding quality and welding efficiency.

[0039] The side of the elevator sill profile positioning platform is equipped with a central clamping fixture. The central clamping fixture is used to move the key functional components in the middle of the profile to the appropriate welding position and fix the key functional components.

[0040] The central fixture includes a lifting structure 9 connected to the base 1 and a lifting plate 10 connected to the end of the output shaft of the lifting structure 9; the extension and retraction of the lifting structure 9 can change the height of the lifting plate 10 connected to it. In embodiment 1, the lifting structure 9 is a hydraulic telescopic rod, and a support frame 8 is fixedly sleeved on the outer ring of the top of the lifting structure 9. The bottom of the support frame 8 is connected to the top of the base 1, and the lifting plate 10 is connected to the end of the output shaft of the lifting structure 9.

[0041] The top of the lifting plate 10 is provided with a slide groove 12, and a slider 24 is movably connected to the inner cavity of the slide groove 12. A fixed seat 13 is connected to the top of the slider 24. The fixed seat 13 is U-shaped, and a rotating shaft 14 is movably connected to the end of the fixed seat 13 away from the fixed plate 2. A rotating horizontal plate 17 is fixedly connected to the outer ring of the rotating shaft 14. A drive structure 16 is provided on the fixed seat 13, and the rotating horizontal plate 17 is driven to rotate through the drive structure 16. In embodiment 2, the drive structure 16 is a servo motor. The output shaft end of the drive structure 16 is connected to the rotating shaft 14 through a reducer and a coupling. When the drive structure 16 drives the rotating shaft 14 to rotate, the rotating shaft 14 drives the rotating horizontal plate 17 connected to it to rotate, and the tilt angle of the rotating horizontal plate 17 can be changed.

[0042] A first accessory support block 18 is provided on the rotating horizontal plate 17. The first accessory support block 18 is L-shaped, and its horizontal end is adapted to the inner cavity of the elevator sill profile. The rotating horizontal plate 17 is located above the horizontal end of the first accessory support block 18. The vertical end of the first accessory support block 18 is detachably connected to the rotating horizontal plate 17. A magnetic attraction point 19 is provided on the top of the second accessory support block 7, and a positioning protrusion 20 adapted to the key functional accessories of the elevator sill profile is provided on one side of the second accessory support block 7. In use, the second accessory support block 7 can be used to position and fix the key functional accessories. Under the action of the lifting structure 9, the first accessory support block 18 can be moved into the inner cavity of the elevator sill profile.

[0043] In Example 3, the magnetic attraction point 19 in this application is an electromagnet. The magnetic attraction point 19 is in an energized state, and the magnetic attraction point 19 and the key functional accessories of the elevator sill profile are magnetically attracted to each other. The material of the magnetic attraction point 19 can be set according to the requirements and is not limited here.

[0044] Two adjacent fixed seats 13 are connected by a connecting rod 25. A first linear moving structure 11 is provided on one side of the top of the lifting plate 10. The output shaft end of the first linear moving structure 11 is connected to the adjacent fixed seat 13. Through the connection rod 25 and the first linear moving structure 11, when the first linear moving structure 11 drives the adjacent fixed seat 13 to move, the moving fixed seat 13 can drive the other fixed seats 13 to move through the connecting rod 25, thereby enabling all fixed seats 13 to move synchronously. The fixed seat 13 can drive the key functional accessories to translate by rotating the horizontal plate 17, so that the key functional accessories can be moved to the welding station to facilitate the welding of the key functional accessories to the elevator sill profile.

[0045] In Example 4, both the first linear movement structure 11 and the second linear movement structure 5 are cylinders. The lifting structure 9 is a hydraulic telescopic rod.

[0046] The number of fixed seats 13 is the same as the number of key functional accessories set in the middle of the elevator sill profile. The rotating cross plate 17 and the welding station of key functional accessories are alternately set, so that the key functional components located in the middle of the profile can be placed synchronously, thereby improving welding efficiency.

[0047] In addition, magnetic blocks 15 are provided on both sides of the fixed base 13. The rotating horizontal plate 17 and the magnetic blocks 15 are in a magnetically attracted state. By using the magnetic attraction between the magnetic blocks 15 and the rotating horizontal plate 17, the position of the rotating horizontal plate 17 can be fixed, improving the stability of the rotating horizontal plate 17 and thus reducing the probability of displacement of key workpiece components during welding. The materials of the rotating horizontal plate 17 and the magnetic blocks 15 can be set according to requirements and are not limited here.

[0048] The bottom of the lifting plate 10 is symmetrically provided with push blocks 22 that are adapted to the elevator sill profile. The top of the base 1 is provided with a groove 21, and the horizontal end of the push block 22 is adapted to the groove 21. When the first accessory support block 18 is located in the inner cavity of the elevator sill profile, the horizontal end of the push block 22 is located below the elevator sill profile, so as to avoid affecting the adjustment and welding of the position of the elevator sill profile. When the bottom of the first accessory support block 18 is at the same height as the top of the elevator sill profile, the top of the push block 22 is at the same height as the top of the fixing plate 2. With this configuration, when the first accessory support block 18 separates from the elevator sill profile, the lifting structure 9 continues to move upward, which can drive the elevator sill profile to move upward through the push block 22, so that the elevator sill profile separates from the elevator sill profile positioning platform. After the elevator sill profile separates from the elevator sill profile positioning platform, the drive structure 16 drives the rotating horizontal plate 17 to rotate, so that the first accessory support block 18 separates from the elevator sill profile, which is convenient for removing the elevator sill profile after welding.

[0049] As described above, the central clamping fixture can be used to position and fix the key functional components in the middle of the elevator sill profile, and can also smoothly lift the welded whole sill profile away from the elevator sill profile positioning platform, thereby significantly simplifying the disassembly operation of the profile and greatly improving the tooling turnover efficiency and production continuity.

[0050] In summary: When using this elevator sill profile welding fixture, multiple elevator sill profiles are placed side by side in the elevator sill profile positioning table slots on the base 1. The profiles are positioned using the limiting block 3 and the roller 4. Then, key functional components of the elevator sill profiles are placed on the second accessory support block 7 and the first accessory support block 18. Taking the reinforcing rib as an example, reinforcing ribs are placed on both the second accessory support block 7 and the first accessory support block 18, and the reinforcing ribs are made to fit tightly against the positioning protrusion 20 to fix the position of the reinforcing ribs on the second accessory support block 7 or the first accessory support block 18, so that the positions of different reinforcing ribs on the second accessory support block 7 and the first accessory support block 18 are consistent. After the reinforcing ribs are placed, the magnetic attraction point 19 is energized, and the magnetic attraction point 19 and the reinforcing rib are magnetically attracted to each other, thus fixing the reinforcing ribs. The reinforcing ribs are fixed at the tail end positioning table 23 using another magnetic attraction point 19.

[0051] After the reinforcing ribs are fixed, the second linear moving structure 5 moves the abutment plate 6, which in turn moves the second accessory support block 7. The second accessory support block 7 can move within the elevator sill profile cavity, and it also moves the reinforcing ribs connected to it. Under the action of the abutment plate 6, the profile gradually approaches the tail-end positioning platform 23 until the ends of the profile are tightly fitted with both the tail-end positioning platform 23 and the abutment plate 6, achieving both clamping and fixing of the profile, as well as positioning of the profile. Furthermore, the head abutment device moves the key functional components of the profile head to the welding station at the profile head, and the tail abutment device moves the key functional components of the profile tail to the welding station at the profile tail.

[0052] During the operation of the tail abutment device and the head abutment device, the rotating horizontal plate 17 is in a horizontal state under the action of the driving structure 16. The lifting structure 9 drives the lifting plate 10 to move down. The lifting plate 10 drives the rotating horizontal plate 17 to move down through the fixed seat 13. The rotating horizontal plate 17 drives the first accessory support block 18 to move down. When the middle reinforcing rib of the profile connected to the first accessory support block 18 is at the same height as the head reinforcing rib of the profile, the first linear movement structure 11 drives the fixed seat 13 to move horizontally. The fixed seat 13 drives the middle reinforcing rib of the profile to move horizontally through the rotating horizontal plate 17 and the first accessory support block 18 until the middle reinforcing rib of the profile moves to the middle of the profile for welding. The position of the reinforcing rib is fixed and welding can be carried out. After welding is completed, the magnetic attraction point 19 is in a de-energized state. The second linear moving structure 5 drives the second accessory support block 7 to reset, and the first linear moving structure 11 drives the fixed seat 13 to reset. After the first accessory support block 18 separates from the central reinforcing rib, the lifting structure 9 drives the lifting plate 10 to move upward. The lifting plate 10 drives the first accessory support block 18 and the push block 22 to move upward. When the first accessory support block 18 separates from the elevator sill profile, the lifting structure 9 continues to move upward, which can drive the elevator sill profile to move upward through the push block 22, so that the elevator sill profile separates from the elevator sill profile positioning platform. After the elevator sill profile separates from the elevator sill profile positioning platform, the driving structure 16 drives the rotating horizontal plate 17 to rotate, so that the first accessory support block 18 separates from the elevator sill profile, which is convenient for removing the elevator sill profile after welding.

Claims

1. A welding fixture for elevator sill profiles, comprising a base (1), characterized in that: An elevator sill profile positioning platform is provided in the middle of the base (1). One end of the elevator sill profile positioning platform is provided with a head abutment device, and the other end of the elevator sill profile positioning platform is provided with a tail abutment device. A middle clamping fixture is provided on the side of the elevator sill profile positioning platform. The central fixture includes a lifting structure (9) connected to the base (1), a lifting plate (10) connected to the end of the output shaft of the lifting structure (9), a fixed seat (13) movably connected to the top of the lifting plate (10), a rotating horizontal plate (17) movably connected to the fixed seat (13), and a first accessory support block (18) connected to the rotating horizontal plate (17). A first linear movement structure (11) is provided on one side of the top of the lifting plate (10). The fixed seat (13) is driven to move linearly through the first linear movement structure (11). Two adjacent fixed seats (13) are connected by a connecting rod (25). A driving structure (16) is provided on the fixed seat (13). The rotating horizontal plate (17) is driven to rotate through the driving structure (16). A push block (22) adapted to the elevator sill profile is symmetrically provided at the bottom of the lifting plate (10).

2. The elevator sill profile welding fixture according to claim 1, characterized in that: The head abutment device includes a second linear moving structure (5) connected to the base (1). The output shaft end of the second linear moving structure (5) is connected to an abutment plate (6) adapted to the elevator sill profile. The abutment plate (6) is provided with a second accessory support block (7) evenly on one side near the elevator sill profile positioning platform.

3. The elevator sill profile welding fixture according to claim 2, characterized in that: Both the second accessory support block (7) and the first accessory support block (18) have magnetic attraction points (19) on their tops, and both the second accessory support block (7) and the first accessory support block (18) have positioning protrusions (20) on one side that are adapted to the key functional accessories of the elevator sill profile.

4. The elevator sill profile welding fixture according to claim 1, characterized in that: The tail abutment device includes a tail end positioning platform (23) connected to the base (1), and the top of the tail end positioning platform (23) is provided with several magnetic attraction points (19).

5. The elevator sill profile welding fixture according to claim 4, characterized in that: The elevator sill profile positioning platform includes several positioning components evenly distributed. Each positioning component includes a fixed plate (2) connected to the base (1). The fixed plate (2) is provided with several limiting groups adapted to the elevator sill profile. Each limiting group includes a roller (4) movably connected to the fixed plate (2) and a limiting block (3) fixedly connected to the fixed plate (2). The distance between the roller (4) and the limiting block (3) is adapted to the elevator sill profile.

6. The elevator sill profile welding fixture according to claim 5, characterized in that: The tail end positioning platform (23) is L-shaped. The top of the horizontal end of the tail end positioning platform (23) is at the same height as the top of the fixing plate (2). The vertical end of the tail end positioning platform (23) is provided with another magnetic attraction point (19).

7. The welding fixture for elevator sill profiles according to claim 1, characterized in that: The base (1) has a groove (21) on its top. The horizontal end of the push block (22) is adapted to the groove (21). When the first accessory support block (18) is located in the inner cavity of the elevator sill profile, the horizontal end of the push block (22) is located below the elevator sill profile. When the bottom of the first accessory support block (18) and the top of the elevator sill profile are at the same height, the top of the push block (22) and the top of the fixing plate (2) are at the same height.

8. The elevator sill profile welding fixture according to claim 1, characterized in that: Both sides of the fixed seat (13) are provided with magnetic blocks (15), and the rotating horizontal plate (17) and the magnetic blocks (15) are in a magnetic attraction state. The number of fixed seats (13) is the same as the number of key functional accessories provided in the middle of the elevator sill profile.

9. The elevator sill profile welding fixture according to claim 1, characterized in that: The first accessory support block (18) is L-shaped. The horizontal end of the first accessory support block (18) is adapted to the inner cavity of the elevator sill profile. The rotating horizontal plate (17) is located above the horizontal end of the first accessory support block (18). The vertical end of the first accessory support block (18) is detachably connected to the rotating horizontal plate (17).

10. The elevator sill profile welding fixture according to claim 1, characterized in that: The top of the lifting plate (10) is provided with a slide groove (12), and the inner cavity of the slide groove (12) is movably connected to a slider (24), which is connected to the bottom of the fixed seat (13).

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