A welding tool and welding device for a side shifter of a forklift truck

Abstract

The utility model relates to a forklift part machining technical field, concretely relates to a welding tool and welding device of forklift side shifter, including installation assembly, installation assembly includes spacing roof, spacing roof sets up in the just above of lower crossbeam and guide pipe, forms the upper limit position of lower crossbeam and guide pipe, sets up on the leveling assembly of installation assembly, leveling assembly elevates lower crossbeam and guide pipe with different height, until with spacing roof contact, above and below clamps lower crossbeam and guide pipe. The utility model discloses through setting up leveling assembly independent elevating lower crossbeam and guide pipe, makes the lower crossbeam and guide pipe of different thickness contact with spacing roof simultaneously, and further its contact surface is in the same plane, when spacing roof and leveling assembly guarantee the positional relationship between lower crossbeam and guide pipe, the both clamps and fixes lower crossbeam and guide pipe, avoids its because of welding heat deformation, improves the structure precision after rectangular frame welding, and further improves the structure precision of forklift side shifter.

Description

Technical Field

[0001] This utility model relates to the field of forklift parts processing technology, specifically to a welding fixture and welding device for a forklift side shifter. Background Technology

[0002] A forklift's side-shift fork carriage includes a side-shift mechanism and a fork carriage. The side-shift mechanism uses a hydraulic system to achieve lateral movement of the fork carriage, which in turn drives the forks to move laterally. For example... Figure 1 As shown, the lateral shifter 5 includes a roller assembly 51 connected to the forklift lifting mechanism, a rectangular frame 52 mounting the roller assembly 51, and a fork carriage connected to the rectangular frame 52. The roller assembly 51 drives the rectangular frame 52 to rise and fall along the lifting mechanism, and the fork carriage moves relative to the rectangular frame 52 and carries the forks (the fork carriage is a common structure in the forklift field and is not shown in the figure). The rectangular frame 52 includes two support columns 521, a lower crossbeam 522, and a guide tube 523. A hydraulic cylinder drives the fork carriage to move laterally left and right along the guide tube 523, thereby driving the forks to move laterally. During the welding process of the rectangular frame 52, the support columns 521, the lower crossbeam 522, and the guide tube 523 need to be positioned and fixed by a positioning mold to determine the final shape of the rectangular frame 52. Then, spot welding is used to connect the support columns 521, the lower crossbeam 522, and the guide tube 523. The guide tube 523 is welded into a rectangular frame pre-processed part, and then the rectangular frame pre-processed part is welded to form a rectangular frame 52. During the welding of the rectangular frame pre-processed part, the side of the rectangular frame 52 connected to the roller assembly 51 is a plane. Taking this plane as a reference, the direction perpendicular to this plane is the thickness and height direction. The thickness of the support column 521 and the lower crossbeam 522 is the same. The thickness of the guide tube 523 is the diameter and wall thickness of the internal through hole. Its thickness is greater than the thickness of the lower crossbeam 522. This makes the bottom support height of the guide tube 523 less than the bottom support height of the lower crossbeam 522 during the welding process. As a result, the side of the guide tube 523 and the lower crossbeam 522 close to the roller assembly 51 is a plane. Thus, the support column 521, the lower crossbeam 522 and the guide tube 523 are all connected to the roller assembly 51 and welded to form a fixing part.

[0003] Chinese patent CN210476031U has been published, which relates to a welding fixture for a side-shift forklift attachment. It includes a pad, side uprights, a guide tube, and a lower crossbeam. The pad elevates the side uprights, guide tube, and lower crossbeam, and provides a certain operating clearance between these components and the mounting platform, facilitating welding of the side uprights, guide tube, and lower crossbeam. However, during the process of welding the side uprights to the guide tube and the lower crossbeam at both ends separately, the guide tube and lower crossbeam undergo bending deformation due to heat, reducing the structural accuracy of the side-shift forklift and consequently affecting its structural strength. Utility Model Content

[0004] This utility model addresses the problem of heat-induced deformation of the guide tube and lower crossbeam during the welding of a forklift side-shifting forklift carriage. It provides a welding fixture and welding device for this forklift side-shifting device, with the specific technical solution as follows: A welding fixture for a forklift side shifter, the welding fixture being used to place a rectangular frame pre-processed component, the rectangular frame pre-processed component including a lower crossbeam and a guide tube, characterized in that the welding fixture includes: an installation assembly, the installation assembly including a limiting top plate, the limiting top plate being disposed directly above the lower crossbeam and the guide tube to form the upper limit position of the lower crossbeam and the guide tube; and a leveling assembly disposed on the installation assembly, the leveling assembly being capable of raising and lowering the lower crossbeam and the guide tube at different heights until they contact the limiting top plate, thereby clamping the lower crossbeam and the guide tube from above and below.

[0005] Furthermore, the leveling assembly includes a fixed leveling component for raising and lowering the guide tube and a movable leveling component for raising and lowering the lower crossbeam. Both the fixed and movable leveling components include: a hydraulic cylinder for raising and lowering the lower crossbeam or guide tube, the extension and retraction direction of the hydraulic cylinder being the thickness direction of the lower crossbeam or guide tube; a mounting plate connected to the extension and retraction end of the hydraulic cylinder, the mounting plate being a horizontal plate, with guide shafts respectively provided at both ends of the mounting plate, the hydraulic cylinder being able to drive the mounting plate to rise and fall along the guide shafts; and a support block connected to the mounting plate and located away from the hydraulic cylinder, the lower crossbeam or guide tube being placed at the working end of the support block away from the mounting plate, the top surface of the working end being tangent to the lower crossbeam or guide tube, the height difference between the tangency points being the thickness difference between the lower crossbeam and the guide tube.

[0006] Preferably, the limiting top plates are respectively set directly above the two ends of the lower crossbeam and the guide tube, and the length direction of the limiting top plates is perpendicular to the length direction of the lower crossbeam and the guide tube. The hydraulic cylinder can push the support block to raise and lower the lower crossbeam or the guide tube. When the two ends of the lower crossbeam or the guide tube are restricted in their rising height by the limiting plates, the support block applies a vertically upward supporting force F1 to the middle position of the lower crossbeam or the guide tube, and the limiting top plates simultaneously apply a vertically downward pressure F2 to the two ends of the lower crossbeam and the guide tube to resist the tendency of the rectangular frame pre-processed component to deform due to heat.

[0007] Preferably, both the fixed leveling component and the movable leveling component further include an elastic support shaft connected to the mounting plate and located away from the hydraulic cylinder. The elastic support shaft is arranged at both ends of the support block along the length direction of the mounting plate to provide multi-point support for the lower crossbeam or guide tube. The lower crossbeam or guide tube is in both the height and thickness directions of the lifting direction. The thickness of the lower crossbeam is less than the thickness of the guide tube. The elastic support shaft can undergo elastic deformation along the height direction. The maximum distance between the end of the elastic support shaft near the lower crossbeam or guide tube and the mounting plate is greater than the thickness of the support block. The minimum distance between the end of the elastic support shaft near the lower crossbeam or guide tube and the mounting plate is not greater than the thickness of the support block.

[0008] Preferably, the mounting assembly further includes a welding base for supporting the leveling assembly. The welding base is connected to the leveling assembly via a mounting base plate. A limiting top plate is disposed above the welding base, and the leveling assembly is disposed between the welding base and the limiting top plate.

[0009] Preferably, it also includes a distance adjustment assembly disposed on the mounting base plate and connected to the movable leveling component. The distance adjustment assembly includes a movable base plate for mounting the hydraulic cylinder. The movable leveling component moves up and down relative to the movable base plate in the height direction. The movable base plate drives the movable leveling component to move through a servo screw and a slide rail. The moving direction of the movable base plate is perpendicular to the length direction between the lower crossbeam and the guide tube, so as to adjust the distance between the movable leveling component and the fixed leveling component.

[0010] Preferably, the pitch adjustment assembly further includes a protective cover for enclosing the servo lead screw, and the moving base plate moves relative to the protective cover.

[0011] Preferably, the mounting base plate forms a through moving groove. During the movement of the moving base plate and the moving leveling component, the hydraulic cylinder passes through the moving groove, and the hydraulic cylinder does not interfere with the mounting base plate during the movement.

[0012] A welding apparatus, characterized in that it comprises: a welding fixture and a welding robot, wherein the welding end of the welding robot is capable of welding a rectangular frame pre-processed part placed on the welding fixture.

[0013] As can be seen from the above technical solution, this utility model has the following beneficial effects: This invention features a leveling assembly that independently raises and lowers the lower crossbeam and guide tube, allowing the lower crossbeam and guide tube of different thicknesses to simultaneously contact the limiting top plate, thus ensuring their contact surfaces are on the same plane. Furthermore, when the limiting top plate and the leveling assembly maintain the positional relationship between the lower crossbeam and guide tube, they can clamp and fix the lower crossbeam and guide tube, thereby preventing deformation due to welding heat, improving the structural accuracy of the rectangular frame after welding, and consequently improving the structural accuracy of the forklift side shifter. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of an existing forklift side shifter; Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the present utility model; Figure 4 for Figure 3 Enlarged view of the structure at point A in the image; Figure 5 This is a schematic diagram of the forces acting on the pre-treated rectangular frame component. Figure 6 for Figure 3 Another structural diagram from a different angle; Figure 7 This is a schematic diagram of the structure of Embodiment 1 of the present invention with the protective cover removed.

[0015] In the diagram: 1. Mounting assembly; 11. Welding base; 12. Mounting base plate; 13. Moving groove; 14. Limiting top plate; 2. Leveling assembly; 21. Fixed leveling component; 22. Moving leveling component; 23. Hydraulic cylinder; 24. Guide shaft; 25. Mounting plate; 26. Elastic support shaft; 27. Support block; 3. Adjustment assembly; 31. Servo screw component; 32. Protective cover; 33. Moving base plate; 34. Slide rail; 4. Welding robot; 5. Side shifter; 51. Roller assembly; 52. Rectangular frame; 521. Support column; 522. Lower crossbeam; 523. Guide tube. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] Example 1 like Figure 2 As shown, this embodiment 1 is a welding fixture for a forklift side shifter 5. The welding fixture is used to place a rectangular frame pre-processed component, which includes a lower crossbeam 522 and a guide tube 523. The welding fixture is characterized by including: a mounting assembly 1, which includes a limiting top plate 14, which is positioned directly above the lower crossbeam 522 and the guide tube 523 to form the upper limit position of the lower crossbeam 522 and the guide tube 523; and a leveling assembly 2, which is provided on the mounting assembly 1. The leveling assembly 2 can raise and lower the lower crossbeam 522 and the guide tube 523 at different heights until they contact the limiting top plate 14, thereby clamping the lower crossbeam 522 and the guide tube 523 from above and below.

[0019] Specifically, the height direction of the rectangular frame pre-processed component is the Z-axis direction in the figure, with its upward direction being the positive Z-axis direction and its downward direction being the negative Z-axis direction. The lower crossbeam 522, guide tube 523, and two supporting columns 521 are sequentially and vertically spot-welded to form the rectangular frame pre-processed component, ensuring that the lower crossbeam 522 and guide tube 523 remain parallel, and that one side of the lower crossbeam 522 and guide tube 523 are flush, while the other side is not flush due to differences in thickness. Next, the rectangular frame pre-processed component is placed between the leveling component 2 and the limiting top plate 14. The leveling component 2 raises and lowers the lower crossbeam 522 and guide tube 523 respectively through an independent lifting mechanism, allowing both the lower crossbeam 522 and guide tube 523, with their different thicknesses, to rise to the limiting top plate 14. This rising position is the limit position for both, thus allowing the leveling component 2, through the lifting mechanism, to clamp the lower crossbeam 522 and guide tube 523 together with the limiting top plate 14.

[0020] During the welding of the rectangular frame pretreatment component, the lower crossbeam 522 and guide tube 523 are heated and bent along the Z-axis. The leveling component 2 uses a lifting mechanism to press the lower crossbeam 522 and guide tube 523 toward the limiting top plate 14, so that the leveling component 2 and the limiting top plate 14 can clamp the lower crossbeam 522 and guide tube 523, thereby limiting the bending deformation of the two along the Z-axis. This ensures that the lower crossbeam 522 and guide tube 523 meet the required straightness during the reinforcement welding of the rectangular frame pretreatment component, thereby ensuring the structural accuracy of the rectangular frame pretreatment component.

[0021] like Figure 3 and Figure 4 As shown, the leveling assembly 2 includes a fixed leveling component 21 for raising and lowering the guide tube 523 and a movable leveling component 22 for raising and lowering the lower crossbeam 522. Both the fixed leveling component 21 and the movable leveling component 22 include: a hydraulic cylinder 23 for raising and lowering the lower crossbeam 522 or the guide tube 523, the extension and retraction direction of the hydraulic cylinder 23 being the thickness direction of the lower crossbeam 522 or the guide tube 523; a mounting plate 25 connected to the extension and retraction end of the hydraulic cylinder 23, the mounting plate 25 being a horizontal plate; and a support block 27 connected to the mounting plate 25 and located away from the hydraulic cylinder 23. The lower crossbeam 522 or the guide tube 523 is placed at the working end of the support block 27 away from the mounting plate 25, the top surface of the working end being tangent to the lower crossbeam 522 or the guide tube 523, and the height difference between the tangent points being the thickness difference between the lower crossbeam 522 and the guide tube 523.

[0022] Specifically, the fixed leveling component 21, the movable leveling component 22, the guide tube 523, and the lower crossbeam 522 all have the same length direction. The mounting plate 25 is a horizontal plate, and the lifting direction of the hydraulic cylinder 23 is the Z-axis direction. Its telescopic end is fixedly connected to the middle position of the mounting plate 25 by bolts. The top surface of the mounting plate 25 is fixedly connected to the support block 27 by bolts, and the top surface of the support block 27 is curved. Among them, the top surface of the support block 27 of the fixed leveling component 21 is tangent to the bottom of the guide tube 523. The hydraulic cylinder 23 of the fixed leveling component 21 raises the guide tube 523 through the support block 27, so that it contacts the bottom of the limiting top plate 14, thereby clamping the guide tube. Guide tube 523; secondly, the top surface of the support block 27 of the movable leveling component 22 is tangent to the bottom of the lower crossbeam 522. The hydraulic cylinder 23 of the movable leveling component 22 raises the lower crossbeam 522 through the support block 27, so that it contacts the bottom of the limiting top plate 14, thereby clamping the guide tube 523. The lower crossbeam 522 and the guide tube 523 have the same upper limit position. Due to the difference in their thicknesses, the extension lengths of the hydraulic cylinders 23 of the two are different, which in turn causes a height difference between the support blocks 27 of the two. This ensures that the structure of the rectangular frame pre-processed component is not damaged during the process of fixing the lower crossbeam 522 and the guide tube 523, and ensures the welding quality.

[0023] The leveling assembly 2 also includes a guide shaft 24 fixedly connected to the bottom of the mounting plate 25. The axial direction of the guide shaft 24 is consistent with the extension and retraction direction of the hydraulic cylinder 23, that is, consistent with the Z-axis direction. During the process of the hydraulic cylinder 23 driving the mounting plate 25 to rise and fall, the guide shaft 24 slides relative to the mounting assembly 1, thereby guiding the mounting plate 25 to rise and fall relative to the mounting assembly 1 along the Z-axis, improving its movement accuracy. At the same time, both ends of the mounting plate 25 are connected to the guide shaft 24, so that it will not rotate along the center line during the lifting and falling process, improving the stability of the lifting and falling.

[0024] Combination Figure 5 As shown, the limiting top plate 14 is respectively set directly above the two ends of the lower crossbeam 522 and the guide tube 523. The length direction of the limiting top plate 14 is perpendicular to the length direction of the lower crossbeam 522 and the guide tube 523. The hydraulic cylinder 23 can push the support block 27 to raise or lower the lower crossbeam 522 or the guide tube 523. When the two ends of the lower crossbeam 522 or the guide tube 523 are restricted in their rising height by the limiting plate, the support block 27 applies a vertically upward supporting force F1 to the middle position of the lower crossbeam 522 or the guide tube 523. At the same time, the limiting top plate 14 applies a vertically downward pressure F2 to the two ends of the lower crossbeam 522 and the guide tube 523 to resist the tendency of the rectangular frame pre-processed parts to deform due to heat.

[0025] Specifically, the length of the limiting top plate 14 is not less than the distance between the lower crossbeam 522 and the guide tube 523, so that it can fully contact one end of the lower crossbeam 522 and the guide tube 523. The top curved surface of the support block 27 is tangent to the bottom surface of the lower crossbeam 522 or the guide tube 523 at the middle position. When the hydraulic cylinder 23 pushes the lower crossbeam 522 and the guide tube 523 to be fixed with the limiting top plate 14 at the same time, the contact points between the limiting top plate 14 and the lower crossbeam 522 and the guide tube 523 are at their two ends, and the contact points between the support block 27 and the lower crossbeam 522 and the guide tube 523 are at their two ends. The contact point of 523 is located in the middle of the two, so that the middle positions of the lower crossbeam 522 and the guide tube 523 are both subjected to a vertically upward supporting force F1, and both ends of the two are subjected to a vertically downward pressure F2. This results in a bending moment at both ends of the lower crossbeam 522 and the guide tube 523 towards the middle, making the total moment zero. At the same time, it can counteract the deformation moment of the lower crossbeam 522 and the guide tube 523 in the opposite direction during the welding process of the rectangular frame pre-processed parts, thereby ensuring the straightness of the two and ensuring the structural accuracy of the rectangular frame pre-processed parts.

[0026] like Figure 4 As shown, both the fixed leveling component 21 and the movable leveling component 22 also include an elastic support shaft 26 connected to the mounting plate 25 and located away from the hydraulic cylinder 23. The elastic support shaft 26 is arranged at both ends of the support block 27 along the length direction of the mounting plate 25 to provide multi-point support for the lower crossbeam 522 or the guide tube 523. The height and thickness directions of the lower crossbeam 522 or the guide tube 523 are both lifting directions. The thickness of the lower crossbeam 522 is less than the thickness of the guide tube 523. The elastic support shaft 26 can undergo elastic deformation along the height direction. The maximum distance between the end of the elastic support shaft 26 near the lower crossbeam 522 or the guide tube 523 and the mounting plate 25 is greater than the thickness of the support block 27. The minimum distance between the end of the elastic support shaft 26 near the lower crossbeam 522 or the guide tube 523 and the mounting plate 25 is not greater than the thickness of the support block 27.

[0027] Specifically, the spring support shaft consists of a compression spring and a T-shaped shaft. The T-shaped shaft passes through and is perpendicularly fixed to the mounting plate 25 of the leveling component 21 or the movable leveling component 22. Its T-end and the support block 27 are both located at the top of the mounting plate 25, and it contacts the bottom of the lower crossbeam 522 or the guide tube 523. When the T-end is compressed, it compresses the spring and slides along the mounting plate 25 to shorten the distance between it and the mounting plate 25. When the hydraulic cylinder 23 raises the lower crossbeam 522 or the guide tube 523 to the limiting top plate 14, the bottom of the lower crossbeam 522 or the guide tube 523 only contacts the T-end of the T-shaped shaft, leaving a gap between it and the top of the support block 27. When the hydraulic cylinder 23 continues to rise, the limiting top plate 14 restricts the lower crossbeam 522 or guide tube 523 from rising further, so that the compression spring of the support shaft at the T end is compressed, thereby shortening the distance between the T end and the mounting plate 25, thus buffering the impact on the lower crossbeam 522 and guide tube 523, until the top curved surface of the support block 27 contacts the bottom of the lower crossbeam 522 or guide tube 523 and applies a vertically upward supporting force F1; wherein, the extension length of the hydraulic cylinder 23 of the fixed leveling component 21 and the movable leveling component 22 is different, and the difference in the extension length of the two is equal to the difference in thickness between the lower crossbeam 522 and the guide tube 523.

[0028] Secondly, the thickness direction of the support block 27 is the Z-axis direction, and the end of the elastic support shaft 26 near the lower crossbeam 522 or the guide tube 523 is the T-end. When the maximum distance between the T-end and the mounting plate 25 is not greater than the thickness of the support block 27, it cannot absorb the impact on the lower crossbeam 522 and the guide tube 523 through the compression spring, causing the two to make direct hard contact with the limiting top plate 14, which affects the surface quality of the two. When the minimum distance between the T-end and the mounting plate 25 is greater than the thickness of the support block 27, when the compression spring is compressed to the limit position, there is still a gap between the top curved surface of the support block 27 and the bottom of the lower crossbeam 522 or the guide tube 523, which makes it unable to apply a vertical upward support force F1 to the two, and thus unable to resist the deformation trend of the two due to heat.

[0029] As shown in Figure 1, the mounting assembly 1 also includes a welding base 11 for supporting the leveling assembly 2. The welding base 11 is connected to the leveling assembly 2 through the mounting base plate 12. The limiting top plate 14 is disposed above the welding base 11, and the leveling assembly 2 is disposed between the welding base 11 and the limiting top plate 14.

[0030] Specifically, the welding base 11 is a frame structure, with its lower part used to support the leveling component 2, and its upper part forming two parallel portal frames. The portal frames are perpendicular to the length direction of the lower crossbeam 522 or the guide tube 523, and both pass through the two portal frames. Secondly, the side of the portal frame close to the mounting base plate 12 is fixedly connected to the mounting base plate 12 by welding or bolts, thereby fixing the leveling component 2. The side of the portal frame located directly above the lower crossbeam 522 or the guide tube 523 is welded with a limit plate 14, thereby forming the upper limit position of the lower crossbeam 522 or the guide tube 523.

[0031] like Figure 7 As shown, this embodiment also includes a distance adjustment assembly 3 disposed on the mounting base plate 12 and connected to the movable leveling component 22. The distance adjustment assembly 3 includes a movable base plate 33 for mounting the hydraulic cylinder 23. The movable leveling component 22 moves up and down relative to the movable base plate 33 in the height direction. The movable base plate 33 drives the movable leveling component 22 to move through the servo screw component 31 and the slide rail 34. The moving direction of the movable base plate 33 is perpendicular to the length direction between the lower crossbeam 522 and the guide tube 523, so as to adjust the distance between the movable leveling component 22 and the fixed leveling component 21.

[0032] Specifically, the servo lead screw component 31 consists of a servo motor, a lead screw, and a connecting block threaded into the lead screw. The servo motor drives the lead screw to rotate, thereby driving the connecting block to move along the axis of the lead screw. Secondly, the movable base plate 33 is bolted to the hydraulic cylinder 23 and guide shaft 24 of the movable leveling component 22. Both ends of the movable base plate 33 are slidably connected to the slide rail 34 fixed on the mounting base plate 12. The movable base plate 33 is also bolted to the connecting block, allowing the connecting block to move along the lead screw and thus drive the movable leveling component 22. The movable base plate 33 and the movable leveling component 22 move along the lead screw. The length direction of the lead screw is perpendicular to the fixed leveling component 21 and the movable leveling component 22, so that the servo transmission component can adjust the distance between the fixed leveling component 21 and the movable leveling component 22, thereby adapting to rectangular frame pre-processed components of different sizes. Secondly, the hydraulic cylinder 23 on the movable base plate 33 pushes the mounting plate 25 up and down along the guide shaft 24, thereby giving the movable leveling component 22 a degree of freedom in two directions, improving the applicability of the fixed welded rectangular frame pre-processed component in this embodiment.

[0033] like Figure 3 As shown, the pitch adjustment assembly 3 also includes a protective cover 32 for enclosing the servo lead screw 31, and the movable base plate 33 moves relative to the protective cover 32.

[0034] Specifically, the protective cover 32 is divided into two parts: one part covers the lead screw mechanism and the other part covers the servo motor. This reduces the contact area between the servo lead screw transmission components and the outside world, reduces the risk of wear caused by impurities on the lead screw mechanism, and improves its service life. Secondly, the protective cover 32 covering the lead screw mechanism does not interfere with the moving connecting block and does not affect the movement of the moving leveling component 22.

[0035] like Figure 6 As shown, the mounting base plate 12 forms a through moving groove 13. During the movement of the moving base plate 33 and the moving leveling component 22, the hydraulic cylinder 23 passes through the moving groove 13, and the hydraulic cylinder 23 does not interfere with the mounting base plate 12 during the movement.

[0036] Specifically, the hydraulic cylinder 23 and guide shaft 24 of the movable leveling component 22 both pass through the movable groove 13 of the mounting base plate 12. During the process of the servo screw component 31 driving the hydraulic cylinder 23 and guide shaft 24 of the movable leveling component 22 to move, the hydraulic cylinder 23 and guide shaft 24 do not contact the mounting base plate 12, thus ensuring the stability of the movement of the movable leveling component 22.

[0037] Example 2 like Figure 2 As shown, this second embodiment is a welding device, characterized in that it includes the welding fixture and welding robot 4 as in the first embodiment. The welding end of the welding robot 4 can weld the rectangular frame pre-processed part placed on the welding fixture.

[0038] Specifically, the welding robot 4 is an industrial robot designed specifically for welding tasks. It includes a control cabinet and a robotic arm with a welding end. The robotic arm is programmed to weld rectangular frame pre-processed parts. The robotic arm typically adopts a 6-axis articulated structure and is driven by a servo motor to achieve high-precision positioning and flexible movement of the welding end. The control cabinet is responsible for processing all information and controlling all actions of the robotic arm during its operation.

[0039] Secondly, the welding process of the rectangular frame 52 is as follows: the pre-treated rectangular frame after spot welding is placed in the support position of the leveling component 2, the hydraulic cylinder 23 raises the lower crossbeam 522 and the guide tube 523 respectively, so that they and the limiting top plate 14 fix the pre-treated rectangular frame together, and the control cabinet controls the robotic arm to weld the pre-treated rectangular frame, thereby forming the rectangular frame 52.

[0040] 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.

[0041] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A welding fixture for a forklift side shifter, the welding fixture being used to place a rectangular frame pre-processed component, the rectangular frame pre-processed component comprising a lower crossbeam (522) and a guide tube (523), characterized in that, The welding fixture includes: The mounting assembly (1) includes a limiting top plate (14) which is disposed directly above the lower crossbeam (522) and the guide tube (523) to form the upper limit position of the lower crossbeam (522) and the guide tube (523). The leveling component (2) is installed on the mounting assembly (1). The leveling component (2) can raise and lower the lower crossbeam (522) and the guide tube (523) at different heights until they contact the limiting top plate (14) and clamp the lower crossbeam (522) and the guide tube (523) from above and below.

2. The welding fixture according to claim 1, characterized in that: The leveling assembly (2) includes a fixed leveling component (21) for raising and lowering the guide tube (523) and a movable leveling component (22) for raising and lowering the lower crossbeam (522). Both the fixed leveling component (21) and the movable leveling component (22) include: The hydraulic cylinder (23) that raises and lowers the lower crossbeam (522) or the guide tube (523) has a telescopic direction that is the thickness direction of the lower crossbeam (522) or the guide tube (523). A mounting plate (25) connected to the telescopic end of the hydraulic cylinder (23), the mounting plate (25) being a horizontal plate, with guide shafts (24) respectively provided at both ends of the mounting plate (25), the hydraulic cylinder (23) being able to drive the mounting plate (25) to rise and fall along the guide shafts (24); and A support block (27) connected to the mounting plate (25) and located away from the hydraulic cylinder (23) has a lower crossbeam (522) or a guide tube (523) placed at the working end of the support block (27) away from the mounting plate (25). The top surface of the working end is tangent to the lower crossbeam (522) or the guide tube (523), and the height difference between the tangent points is the thickness difference between the lower crossbeam (522) and the guide tube (523).

3. The welding fixture according to claim 2, characterized in that: The limiting top plate (14) is respectively located directly above both ends of the lower crossbeam (522) and the guide tube (523), and the length direction of the limiting top plate (14) is perpendicular to the length direction of the lower crossbeam (522) and the guide tube (523); The hydraulic cylinder (23) can push the support block (27) to raise or lower the lower crossbeam (522) or the guide tube (523). When the two ends of the lower crossbeam (522) or the guide tube (523) are respectively restricted in their rising height by the limiting top plate (14), the support block (27) applies a vertically upward supporting force F1 to the middle position of the lower crossbeam (522) or the guide tube (523), and the limiting top plate (14) simultaneously applies a vertically downward pressure F2 to both ends of the lower crossbeam (522) and the guide tube (523) to resist the tendency of the rectangular frame pre-processed component to deform due to heat.

4. The welding fixture according to claim 2, characterized in that: Both the fixed leveling component (21) and the movable leveling component (22) further include an elastic support shaft (26) connected to the mounting plate (25) and located away from the hydraulic cylinder (23). The elastic support shaft (26) is arranged at both ends of the support block (27) along the length direction of the mounting plate (25) to provide multi-point support for the lower crossbeam (522) or the guide tube (523). The lower crossbeam (522) or the guide tube (523) is in the lifting direction in both the height and thickness directions. The thickness of the lower crossbeam (522) is less than the thickness of the guide tube (523). The elastic support shaft (26) can elastically deform along the height direction. The maximum distance between the end of the elastic support shaft (26) near the lower crossbeam (522) or the guide tube (523) and the mounting plate (25) is greater than the thickness of the support block (27). The minimum distance between the end of the elastic support shaft (26) near the lower crossbeam (522) or the guide tube (523) and the mounting plate (25) is not greater than the thickness of the support block (27).

5. The welding fixture according to claim 4, characterized in that: The mounting assembly (1) further includes a welding base (11) for supporting the leveling assembly (2). The welding base (11) is connected to the leveling assembly (2) via a mounting base plate (12). The limiting top plate (14) is disposed above the welding base (11). The leveling assembly (2) is disposed between the welding base (11) and the limiting top plate (14).

6. The welding fixture according to claim 5, characterized in that: It also includes a distance adjustment assembly (3) disposed on the mounting base plate (12) and connected to the movable leveling component (22). The distance adjustment assembly (3) includes a movable base plate (33) for mounting the hydraulic cylinder (23). The movable leveling component (22) moves up and down relative to the movable base plate (33) along the height direction. The movable base plate (33) drives the movable leveling component (22) to move through a servo screw (31) and a slide rail (34). The moving direction of the movable base plate (33) is perpendicular to the length direction between the lower crossbeam (522) and the guide tube (523) to adjust the distance between the movable leveling component (22) and the fixed leveling component (21).

7. The welding fixture according to claim 6, characterized in that: The adjustable distance assembly (3) also includes a protective cover (32) for enclosing the servo lead screw (31), and the movable base plate (33) moves relative to the protective cover (32).

8. The welding fixture according to claim 7, characterized in that: The mounting base plate (12) forms a through moving groove (13). During the movement of the moving base plate (33) and the moving leveling component (22), the hydraulic cylinder (23) passes through the moving groove (13) and does not interfere with the mounting base plate (12) during the movement.

9. A welding apparatus, characterized in that, include: The welding fixture and welding robot (4) according to any one of claims 1 to 8, wherein the welding end of the welding robot (4) is capable of welding a rectangular frame pre-processed part placed on the welding fixture.

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