A welding device for an elevator guide rail

Abstract

The application relates to the technical field of welding equipment, in particular to a welding device for elevator guide rails, which comprises a welding robot, is used for welding after butt joint of the guide rails, and further comprises a mounting rack, two groups of mirror image distributed positioning and cleaning mechanisms arranged on the mounting rack and driving lead screws used for driving the positioning and cleaning mechanisms to act; the positioning and cleaning mechanisms comprise a friction positioning assembly which is driven to move along the driving lead screws in the axial direction; and a slide rail assembly is used for clamping the guide rails. When the guide rails are initially clamped on the slide rail assembly, the butt joint surface is in abutment with the friction positioning assembly; when the friction positioning assembly is driven to move, the guide rails slide on the slide rail assembly and follow the friction positioning assembly to move; and after the friction positioning assembly moves to the end of the stroke, the guide rails move through the friction positioning assembly to the butt joint position, so that convenient butt joint positioning of the guide rails can be realized, and the friction positioning assembly can synchronously realize friction cleaning of the butt joint surface of the guide rails when moving from the starting end to the end.

Description

Technical Field

[0001] This invention relates to the field of welding equipment technology, specifically to a welding device for elevator guide rails. Background Technology

[0002] During the production and assembly of elevator guide rails, welding is required to connect the rails according to installation needs, using high-temperature heat to fuse the mating surfaces between different guide rail structures. Current technology primarily utilizes welding equipment with butt-jointing capabilities to achieve the butt-joining and welding of the guide rails.

[0003] For example, invention patent CN106181191A discloses an elevator beam welding fixture, including a support frame, a set of guide rails disposed above the support frame, a beam positioning assembly, a safety clamp seat plate positioning assembly, and a bracket positioning assembly respectively disposed on the guide rails. The safety clamp seat plate positioning assembly is located at one end of the guide rails, the bracket positioning assembly is located at the other end of the guide rails, and the beam positioning assembly is located between the safety clamp seat plate positioning assembly and the bracket positioning assembly. By setting the clamp seat plate and other positioning components on the support frame, it achieves the docking and positioning of the parts to be welded.

[0004] As with the prior art of the aforementioned patent, although it can achieve docking and positioning of the guide rail, it mainly relies on positioning pins and control hand dials for adjustment, making it difficult to achieve rapid positioning of the guide rail. In addition, before welding, it is difficult to effectively pre-treat impurities such as rust and oxide scale on the guide rail docking surface, which leads to the risk of porosity and slag inclusion defects in the weld. Therefore, there is an urgent need for a welding device for elevator guide rails to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a welding device for elevator guide rails to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a welding device for elevator guide rails, including a welding robot for welding after the guide rails are joined, and further including: an installation frame, wherein the installation frame is provided with two sets of mirror-distributed positioning and cleaning mechanisms and a drive screw for driving the positioning and cleaning mechanisms to move.

[0007] The positioning and cleaning mechanism includes a friction positioning component that is driven to move axially along a drive screw; a slide rail component for clamping a guide rail; and a transmission component for transmitting power between the friction positioning component and the slide rail component.

[0008] When the friction positioning component moves from the beginning to the end of its stroke, the guide rail moves along the slide rail component. The friction positioning component cleans the mating surface of the guide rail by friction during its movement. When the friction positioning component moves to the end of its stroke, the guide rail passes through the friction positioning component and moves to the mating position. At this time, the friction positioning component can drive the guide rail to rotate axially through the slide rail component.

[0009] Preferably, the drive screw is movably mounted inside the mounting frame, the friction positioning assembly is movably mounted on the mounting frame, and the drive screw and the friction positioning assembly are connected by a screw.

[0010] Preferably, the friction positioning assembly includes a mounting housing, which is connected to a drive screw. Inside the mounting housing, a friction disc and a transmission gear are rotatably mounted and meshed. The transmission gear is engaged with the outside of the drive screw, and the drive screw rotates synchronously with the transmission gear.

[0011] Preferably, when the guide rail is initially clamped, the mating surface abuts against the friction disc. When the positioning and cleaning mechanism moves from the beginning to the end of its stroke, the friction disc is driven to rotate and perform friction cleaning on the mating surface of the guide rail.

[0012] Preferably, the friction disc has a release groove, and when the friction disc moves to the end of its stroke, the guide rail can pass through the release groove and move to the docking position.

[0013] Preferably, the slide rail assembly includes a guide slide rail with its bottom end facing the center of the mounting frame, and a positioning roller group is slidably mounted on the guide slide rail for engaging the guide rail.

[0014] Preferably, the positioning and cleaning mechanism further includes a rotating component for limiting the position of the slide rail assembly. The rotating component includes a positioning collar, which is rotatably mounted on the mounting frame; and a connecting arm, which is fixedly connected to the positioning collar for connecting the slide rail assembly.

[0015] Preferably, the transmission component is mounted on the connecting arm, and one end of the transmission component near the middle of the mounting frame is engaged with the friction disc. When the friction disc moves to the end of its stroke, it is connected to the slide rail assembly via the transmission component.

[0016] Preferably, the transmission assembly includes an outer transmission sleeve and an inner transmission sleeve that is movably fitted inside the outer transmission sleeve. The end of the inner transmission sleeve near the friction disc is fixedly connected to a connecting claw. When the friction disc moves to the end of its stroke, the inner transmission sleeve can be pulled to drive the connecting claw to engage with the friction disc.

[0017] Preferably, a locking rod is fixedly installed on the side of the mounting housing near the rotating component to restrict the rotation of the rotating component before the mounting housing moves to the end of its stroke.

[0018] In the above technical solution, the beneficial effects of the present invention are as follows: when the guide rail is initially clamped on the slide rail assembly, the mating surface abuts against the friction positioning component. When the friction positioning component is driven to move, the guide rail slides on the slide rail assembly and follows the movement of the friction positioning component. After the friction positioning component moves to the end of its stroke, the guide rail passes through the friction positioning component and moves to the mating position, which can realize convenient mating and positioning of the guide rail. Moreover, when the friction positioning component moves from the beginning to the end, it can simultaneously clean the mating surface of the guide rail by friction, avoiding the impact of impurities such as rust and oxide scale on the mating surface of the guide rail on the welding quality. In addition, after the friction positioning component moves to the end of its stroke, it can drive the guide rail to rotate through the slide rail assembly, which facilitates the adjustment of the welding position of the guide rail and reduces the welding difficulty.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0020] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the overall assembled structure of the present invention;

[0023] Figure 2 This is a front view of the overall structure of the positioning and cleaning mechanism of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the guide rail after centering and positioning according to the present invention;

[0025] Figure 4 This is a schematic diagram of the overall structure of the positioning and cleaning mechanism of the present invention;

[0026] Figure 5 This is a schematic diagram of the overall structure of the friction positioning component of the present invention;

[0027] Figure 6 This is a schematic diagram of the cross-sectional structure of the friction positioning component of the present invention;

[0028] Figure 7 This is a schematic diagram of the connection between the rotating component and the slide rail component of the present invention;

[0029] Figure 8This is a schematic diagram of the overall structure of the slide rail assembly of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of the slide rail assembly and the guide rail of the present invention.

[0031] Figure 10 This is a schematic diagram of the structure of the transmission component and the friction disc of the present invention.

[0032] Figure 11 This is a schematic diagram of the overall structure of the internal transmission sleeve rod of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] In the diagram: 1. Welding robot; 2. Mounting frame; 3. Guide rail; 4. Positioning and cleaning mechanism; 41. Friction positioning assembly; 411. Mounting housing; 412. Friction disc; 413. Release groove; 414. Connecting ring groove; 415. Transmission gear; 42. Rotation assembly; 421. Mounting ring frame; 422. Positioning collar; 423. Connecting arm; 43. Slide rail assembly; 431. Guide slide rail; 432. Positioning roller group; 433. Baffle adjustment part; 44. Transmission assembly; 441. Outer transmission sleeve; 442. Inner transmission sleeve; 443. Return spring; 444. Connecting claw; 45. Locking rod; 5. Servo motor; 6. Drive screw. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0036] Please see Figure 1-11 The present invention provides a technical solution: a welding device for elevator guide rails, including a welding robot 1 for welding guide rails 3 after docking, and also including: a mounting frame 2, on which two sets of mirror-distributed positioning and cleaning mechanisms 4 and a drive screw 6 for driving the positioning and cleaning mechanisms 4 to move.

[0037] The positioning and cleaning mechanism 4 includes a friction positioning component 41, which is driven to move axially along the drive screw 6; a slide rail component 43, which is used to clamp the guide rail 3; and a transmission component 44, which is used to transmit power between the friction positioning component 41 and the slide rail component 43.

[0038] When the friction positioning component 41 moves from the beginning to the end of its stroke, the guide rail 3 moves along the slide rail component 43 following the friction positioning component 41. The friction positioning component 41 cleans the mating surface of the guide rail 3 by friction during its movement. When the friction positioning component 41 moves to the end of its stroke, the guide rail 3 passes through the friction positioning component 41 and moves to the mating position. At this time, the friction positioning component 41 can drive the guide rail 3 to rotate axially through the slide rail component 43.

[0039] The welding robot 1 is located in the middle of the left and right sides of the mounting frame 2, and between the two sets of positioning and cleaning mechanisms 4. The two sets of positioning and cleaning mechanisms 4 can dock and position the two sets of guide rails 3, and make the docking position of the two sets of guide rails 3 located in the middle of the mounting frame 2, and make the docking position of the two sets of guide rails 3 correspond to the position of the welding robot 1. The welding robot 1 is controlled by the existing control system and can weld the docked and positioned guide rails 3.

[0040] Specifically, the two guide rails 3 that need to be butt-welded are respectively clamped onto the slide rail assemblies 43 in the two sets of positioning and cleaning mechanisms 4, and the mating surfaces of the guide rails 3 abut against the friction positioning assembly 41; the drive screw 6 is driven to rotate, causing the friction positioning assembly 41 to move from the first end to the last end. The slide rail assembly 43 is tilted. When the friction positioning assembly 41 moves, the guide rails 3 can slide on the slide rail assembly 43 under the action of gravity and follow the movement of the friction positioning assembly 41, so that the mating surfaces of the guide rails 3 are always in contact with the friction positioning assembly 41; during the movement, the friction positioning assembly 41 can remove rust and oxide scale from the mating surfaces of the guide rails 3. Impurities are removed by friction; when the friction positioning component 41 moves to the end of its stroke, it releases its obstruction of the guide rail 3, and the guide rail 3 passes through the friction positioning component 41 and slides on the slide rail component 43, moving towards the middle of the mounting frame 2 to the docking position, thereby positioning the guide rail 3 in the welding position; when the friction positioning component 41 moves to the end of its stroke, it is connected to the slide rail component 43 through the transmission component 44, and the friction positioning component 41 is driven to rotate the slide rail component 43 and the guide rail 3 through the transmission component 44, thereby adjusting the welding position of the guide rail 3.

[0041] Compared with the prior art, when the guide rail 3 is initially clamped on the slide rail assembly 43, the mating surface abuts against the friction positioning assembly 41. When the friction positioning assembly 41 is driven to move, the guide rail 3 slides on the slide rail assembly 43 and follows the movement of the friction positioning assembly 41. After the friction positioning assembly 41 moves to the end of its stroke, the guide rail 3 passes through the friction positioning assembly 41 and moves to the mating position, which can realize convenient mating and positioning of the guide rail 3. When the friction positioning assembly 41 moves from the beginning to the end, it can simultaneously achieve friction cleaning of the mating surface of the guide rail 3, avoiding the impact of impurities such as rust and oxide scale on the mating surface of the guide rail 3 on the welding quality. In addition, after the friction positioning assembly 41 moves to the end of its stroke, it can drive the guide rail 3 to rotate through the slide rail assembly 43, which facilitates the adjustment of the welding position of the guide rail 3 and reduces the welding difficulty.

[0042] As a preferred technical solution in this embodiment, the drive screw 6 is movably installed inside the mounting frame 2, and the friction positioning component 41 is movably installed on the mounting frame 2. The drive screw 6 and the friction positioning component 41 are connected by a screw. Specifically, a servo motor 5 is fixedly installed inside the mounting frame 2, and the output shaft of the servo motor 5 is fixedly connected to one end of the drive screw 6. The servo motor 5 drives the drive screw 6 to rotate, which can drive the friction positioning component 41 to move along the axial direction of the drive screw 6. A slide rail that cooperates with the friction positioning component 41 is fixedly installed at the bottom of the inner side of the mounting frame 2 to limit the position of the friction positioning component 41 and ensure the stability of the friction positioning component 41 when it moves.

[0043] As a preferred technical solution of this embodiment, the friction positioning assembly 41 includes a mounting housing 411, which is connected to the drive screw 6. A friction disc 412 and a transmission gear 415 are rotatably mounted inside the mounting housing 411. The transmission gear 415 is engaged with the outside of the drive screw 6. When the drive screw 6 rotates, it synchronously drives the transmission gear 415 to rotate. Specifically, the mounting housing 411 and the drive screw 6 are helically connected. When the drive screw 6 rotates, it can drive the mounting housing 411 to move axially, thereby adjusting the overall position of the friction positioning assembly 41. A slot is provided on the outside of the drive screw 6 to cooperate with the transmission gear 415. When the drive screw 6 rotates and drives the friction positioning assembly 41 to move as a whole, it can synchronously drive the transmission gear 415 and the friction disc 412 to rotate.

[0044] As a preferred technical solution in this embodiment, when the guide rail 3 is initially clamped, the mating surface abuts against the friction disk 412. When the positioning and cleaning mechanism 4 moves from the beginning to the end of the stroke, the friction disk 412 is driven to rotate and perform friction cleaning on the mating surface of the guide rail 3. Specifically, when the drive screw 6 rotates to adjust the axial position of the friction positioning component 41, the transmission gear 415 and the friction disk 412 can be driven to rotate synchronously through the slot transmission. Since the guide rail 3 slides on the slide rail component 43 and follows the movement of the friction disk 412, the friction disk 412 can perform friction cleaning on the mating surface of the guide rail 3 for impurities such as rust and oxide scale when it rotates.

[0045] As a preferred technical solution in this embodiment, a release groove 413 is provided on the friction disc 412. When the friction disc 412 moves to the end of its stroke, the guide rail 3 can pass through the release groove 413 and move to the docking position. Specifically, when the friction disc 412 moves from the beginning to the end of its stroke, the guide rail 3 slides on the slide rail assembly 43 at an angle, and the axial displacement and height of the guide rail 3 are adjusted simultaneously. When the friction disc 412 moves to the end of its stroke, the upper edge and both sides of the release groove 413 correspond to the upper edge and both sides of the guide rail 3, respectively. The friction disc 412 releases the obstruction of the guide rail 3 position. The guide rail 3 continues to slide downward on the slide rail assembly 43 and to the middle position of the mounting frame 2, and moves through the release groove 413 to the docking position, thereby realizing the quick and convenient positioning of the guide rail 3 to the welding position.

[0046] As a preferred embodiment, the slide rail assembly 43 includes a guide slide rail 431, the bottom of which faces the middle of the mounting frame 2. A positioning roller assembly 432 is slidably mounted on the guide slide rail 431 for engaging the guide rail 3. Specifically, the guide slide rail 431 is tilted so that when the friction disc 412 moves axially, the guide rail 3 can slide tilted on the guide slide rail 431, adjusting the axial and height positions of the guide rail 3. This allows the mating surface of the guide rail 3 to abut against the friction disc 412 when the friction disc 412 moves, achieving friction cleaning of the mating surface of the guide rail 3 by the rotation of the friction disc 412. Simultaneously, when the friction disc 412 reaches the end of its stroke, the guide rail 3 can move to the central axis position of the friction disc 412, facilitating subsequent adjustment of the welding position by the friction disc 412 driving the guide rail 3 to rotate. The positioning roller assembly 432... The guide rail 3 is mounted on several rollers, and the guide rail 3 can be engaged with these rollers. The gap between the rollers is adapted to the size of the guide rail 3, ensuring the stability of the guide rail 3 after it is installed on the positioning roller assembly 432. The slide rail assembly 43 also includes a baffle adjustment part 433, which is located below the inner side of the guide slide rail 431. It consists of an adjustment screw and a baffle. Rotating the adjustment screw can adjust the position of the baffle. When the guide rail 3 is initially installed, the mating surface abuts against the friction disc 412. By restricting the positioning roller assembly 432 through the baffle adjustment part 433, the guide rail 3 can be aligned and moved to the mating position after the positioning roller assembly 432 moves down to the position. It should be noted that by making the baffle adjustment part 433 adjustable, the downward position of the positioning roller assembly 432 can be finely adjusted to compensate for the differences in the size of the guide rail 3.

[0047] As a preferred technical solution of this embodiment, the positioning and cleaning mechanism 4 further includes a rotating component 42 for restricting the position of the slide rail assembly 43. The rotating component 42 includes a positioning collar 422, which is rotatably mounted on the mounting frame 2; and a connecting arm 423, which is fixedly connected to the positioning collar 422 for connecting the slide rail assembly 43. Specifically, the rotating component 42 also includes a mounting ring frame 421, which is fixedly mounted on the mounting frame 2, and the positioning collar 422 is rotatably mounted inside the mounting ring frame 421. The end of the connecting arm 423 away from the positioning collar 422 is fixedly connected to the guide slide rail 431, thereby realizing the fixed connection between the positioning collar 422 and the guide slide rail 431, ensuring that the guide slide rail 431, the positioning roller group 432, and the guide rail 3 can rotate stably on the mounting ring frame 421 through the positioning collar 422.

[0048] As a preferred technical solution in this embodiment, the transmission component 44 is mounted on the connecting arm 423, and one end of the transmission component 44 near the middle of the mounting frame 2 is engaged with the friction disk 412. When the friction disk 412 moves to the end of its stroke, it is connected to the slide rail assembly 43 through the transmission component 44. Specifically, the friction disk 412 is provided with a connecting ring groove 414 that cooperates with the transmission component 44. When the friction disk 412 moves from the beginning to the end of its stroke, the end of the transmission component 44 slides in the connecting ring groove 414, ensuring that the friction disk 412 can rotate to rub and clean the mating surface of the guide rail 3. At the same time, after the friction disk 412 moves into place, the transmission component 44 can be pulled through the connecting ring groove 414 to achieve a rigid connection between the friction disk 412 and the slide rail assembly 43 through the transmission component 44, ensuring that the friction disk 412 can drive the slide rail assembly 43 and the guide rail 3 to rotate through the transmission component 44.

[0049] As a preferred embodiment, the transmission assembly 44 includes an outer transmission sleeve 441 and an inner transmission sleeve 442 movably fitted inside the outer transmission sleeve 441. A connecting claw 444 is fixedly connected to one end of the inner transmission sleeve 442 near the friction disc 412. When the friction disc 412 moves to the end of its stroke, the inner transmission sleeve 442 can be pulled to engage the connecting claw 444 onto the friction disc 412. Specifically, a return spring 443 located inside the outer transmission sleeve 441 is movably fitted outside the inner transmission sleeve 442 to reset the inner transmission sleeve 442. A locking hole that mates with the connecting claw 444 is provided on the inner side of the connecting ring groove 414. When the connecting ring groove 414 moves to the end of its stroke by 5-10 mm, the friction disc 412 begins to move through the connecting ring groove 414. The outer transmission sleeve 441 is moved, and the end of the inner transmission sleeve 442 away from the friction disc 412 is restricted by the connecting arm 423. There is relative movement between the outer transmission sleeve 441 and the inner transmission sleeve 442. When the friction disc 412 moves into place, the connecting claw 444 can then engage with the locking hole inside the connecting ring groove 414, thereby locking the position of the transmission component 44 on the friction disc 412. This allows the friction disc 412 to continue rotating, and the transmission component 44 can rotate to drive the slide rail component 43 and the guide rail 3 to rotate synchronously. The axial cross-sectional shape of the outer transmission sleeve 441 and the inner transmission sleeve 442 is hexagonal, which prevents the axial rotation of the outer transmission sleeve 441 and the inner transmission sleeve 442, thereby ensuring that the connecting claw 444 can accurately engage with the locking hole inside the connecting ring groove 414.

[0050] As a preferred technical solution in this embodiment, a locking rod 45 is fixedly installed on the side of the mounting housing 411 near the rotating component 42. This locking rod is used to restrict the rotation of the rotating component 42 before the mounting housing 411 moves to the end of its stroke. Specifically, the locking rod 45 is inserted into the positioning collar 422. When the friction positioning component 41 moves from the beginning to the end of its stroke, the locking rod 45 restricts the rotation of the positioning collar 422, thereby ensuring the stability of the position of the slide rail component 43 and the guide rail 3, and ensuring that the two sets of guide rails 3 can be stably connected. When the friction positioning component 41 moves into place at the end of its stroke, the locking rod 45 just disengages from the rotating component 42, ensuring that the positioning collar 422 and the slide rail component 43 can be rotated synchronously when the friction disc 412 continues to rotate.

[0051] It should be noted that the drive screw 6 has a helical groove on its exterior that mates with the mounting housing 411; the end of the slot near the middle of the drive screw 6 is 5-10 cm longer than the end of the helical groove near the middle of the drive screw 6; when the friction positioning assembly 41 moves to the end of its stroke towards the middle of the drive screw 6, the mounting housing 411 moves to the end of the helical groove on the exterior of the drive screw 6, and the mounting housing 411 is disconnected from the helical groove. The transmission gear 415 is still engaged with the slot on the exterior of the drive screw 6. When the drive screw 6 continues to rotate, it will not drive the mounting housing 411 to move axially along the drive screw 6, but it can still drive the transmission gear 415 to rotate. Therefore, after the friction positioning assembly 41 moves to the end of its stroke, the drive screw 6 can continue to drive the transmission gear 415 and the friction disc 412 to rotate, thereby driving the slide rail assembly 43 and the guide rail 3 to rotate, adjusting the welding position of the guide rail 3; drive The movable screw 6 is externally fitted with a compression spring that mates with the mounting housing 411. After the guide rail 3 is docked and welded, the servo motor 5, under the control of the existing servo control system, drives the drive screw 6 to reverse. The compression spring applies elastic force to the mounting housing 411, allowing the mounting housing 411 to quickly reconnect with the spiral groove on the outside of the drive screw 6. The drive screw 6 then drives the friction positioning assembly 41 to reset. It should also be noted that after the guide rail 3 is welded, it is pulled out along the slide rail assembly 43 for unloading. In order to achieve the reset of the positioning roller assembly 432 on the guide slide rail 431 after the guide rail 3 is disengaged from the slide rail assembly 43, a spring can be set on the guide slide rail 431 following the tilt direction of the guide slide rail 431 to press the positioning roller assembly 432 to automatically reset, or a magnet can be set at the top of the guide slide rail 431 to manually push the positioning roller assembly 432 to reset and fix it by magnetic attraction.

[0052] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A welding device for elevator guide rails, comprising a welding robot (1) for welding guide rails (3) after they are joined, characterized in that, It also includes: a mounting frame (2), on which two sets of mirror-distributed positioning and cleaning mechanisms (4) and a drive screw (6) for driving the positioning and cleaning mechanisms (4) to move. The positioning and cleaning mechanism (4) includes a friction positioning component (41) which is driven to move axially along the drive screw (6); a slide rail component (43) for clamping the guide rail (3); and a transmission component (44) for transmitting power between the friction positioning component (41) and the slide rail component (43). When the friction positioning component (41) moves from the beginning to the end of its stroke, the guide rail (3) moves along the slide rail component (43) following the friction positioning component (41). The friction positioning component (41) cleans the mating surface of the guide rail (3) by friction during its movement. When the friction positioning component (41) moves to the end of its stroke, the guide rail (3) passes through the friction positioning component (41) and moves to the mating position. At this time, the friction positioning component (41) can drive the guide rail (3) to rotate axially through the slide rail component (43). The friction positioning assembly (41) includes a mounting housing (411), which is connected to the drive screw (6) via transmission. Inside the mounting housing (411), a friction disc (412) and a transmission gear (415) are rotatably mounted and meshed with each other. The transmission gear (415) is engaged with the outside of the drive screw (6). When the drive screw (6) rotates, it synchronously drives the transmission gear (415) to rotate. When the guide rail (3) is initially clamped, the mating surface abuts against the friction disk (412). When the positioning and cleaning mechanism (4) moves from the beginning to the end of the stroke, the friction disk (412) is driven to rotate and rub and clean the mating surface of the guide rail (3). The friction disc (412) is provided with a release groove (413). When the friction disc (412) moves to the end of its stroke, the guide rail (3) can pass through the release groove (413) and move to the docking position. The slide rail assembly (43) includes a guide slide rail (431) with its bottom end facing the middle of the mounting frame (2). A positioning roller group (432) is slidably mounted on the guide slide rail (431) for engaging the guide rail (3).

2. The welding device for elevator guide rails according to claim 1, characterized in that, The drive screw (6) is movably mounted inside the mounting frame (2), and the friction positioning assembly (41) is movably mounted on the mounting frame (2). The drive screw (6) and the friction positioning assembly (41) are connected by a screw.

3. The welding device for elevator guide rails according to claim 1, characterized in that, The positioning and cleaning mechanism (4) further includes a rotating component (42) for limiting the position of the slide rail assembly (43). The rotating component (42) includes a positioning collar (422) which is rotatably mounted on the mounting frame (2); and a connecting arm (423) which is fixedly connected to the positioning collar (422) for connecting the slide rail assembly (43).

4. The welding device for elevator guide rails according to claim 3, characterized in that, The transmission component (44) is mounted on the connecting arm (423), and one end of the transmission component (44) near the middle of the mounting frame (2) is engaged with the friction disc (412). When the friction disc (412) moves to the end of its stroke, it is connected to the slide rail component (43) through the transmission component (44).

5. The welding device for elevator guide rails according to claim 4, characterized in that, The transmission assembly (44) includes an outer transmission sleeve (441) and an inner transmission sleeve (442) movably fitted inside the outer transmission sleeve (441). The inner transmission sleeve (442) is fixedly connected to a connecting claw (444) at one end near the friction disc (412). When the friction disc (412) moves to the end of its stroke, it can pull the inner transmission sleeve (442) to drive the connecting claw (444) to engage with the friction disc (412).

6. The welding device for elevator guide rails according to claim 3, characterized in that, A locking rod (45) is fixedly installed on the side of the mounting housing (411) near the rotating assembly (42) to restrict the rotation of the rotating assembly (42) before the mounting housing (411) moves to the end of its stroke.

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