Large forklift frame welding device and welding process

Abstract

The present application relates to the technical field of forklift frame welding, and particularly relates to a large forklift frame welding device and welding process. The large forklift frame welding device comprises: a frame positioning table for placing and positioning a forklift frame; a welding device for welding a material piece; a connecting seat transfer device comprising a conveying device, a connecting frame body and a movable frame body, the connecting frame body is installed on the conveying device, the movable frame body is connected to the connecting seat away from the driving seat on one side, the movable frame body is movably installed on the connecting frame body, and the movable frame body can be flipped on the connecting frame body; a posture limiting device is arranged on the connecting frame body, the posture limiting device is used for limiting the movable frame body to a first posture, the movable frame body can be flipped around the bottom edge of the connecting surface to the connecting surface and the limiting surface, and at this time, the movable frame body is in a second posture. The automatic conveying and positioning of the connecting seat are realized, the intermediate operation steps and auxiliary time are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of forklift frame welding technology, specifically to a large forklift frame welding device and welding process. Background Technology

[0002] The drive unit of a large forklift frame is connected to the fork arm seat via a connecting seat to reinforce the frame. During welding, one end of the drive unit must first be welded to the fork arm seat, and then the connecting seat is placed on the inclined limiting surface on the drive unit to weld the connecting seat between the drive unit and the fork arm seat.

[0003] To ensure the positioning accuracy between the connector and the drive seat, the existing welding process involves setting a detachable positioning frame at the lower end of the connector. The positioning surface on the positioning frame supports the bottom surface of the connector and forms a V-shape with the limiting surface to achieve the positioning of the connector.

[0004] The shortcomings of existing technology are: On the one hand, during the welding process, the positioning frame needs to be removed in order to weld the parts that are blocked by the positioning frame (especially the bottom of the connecting seat), which affects the welding efficiency.

[0005] On the other hand, the process of moving the connecting seat needs to be done manually or by a separate conveying device, which results in low handling efficiency and easily affects positioning accuracy. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a large forklift frame welding device that realizes automatic conveying and positioning of the connecting seat, reduces intermediate operation steps and auxiliary time, and improves production efficiency.

[0007] To achieve the above objectives, the present invention provides a large forklift frame welding device, comprising: A frame positioning platform is used to place and position the forklift frame; Welding equipment, used for welding materials; A connecting seat transfer device includes a conveying device, a connecting frame and a movable frame. The connecting frame is installed on the conveying device, and the movable frame is connected to the side of the connecting seat away from the drive seat. The movable frame is movably installed on the connecting frame and can rotate on the connecting frame. An attitude limiting device is installed on the connecting frame. The attitude limiting device is used to limit the movable frame to a first attitude. At this time, the conveying device can move the connecting frame in the horizontal direction so that the bottom edge of the connecting surface abuts against the limiting surface. In this case, when the attitude limiting device releases the limitation on the movable frame, the movable frame can rotate around the bottom edge of the connecting surface on the connecting frame until the connecting surface is in contact with the limiting surface. At this time, the movable frame is in a second attitude. A clamping device, which is mounted on the movable frame, is used to clamp the connecting seat.

[0008] Furthermore, in this application, a large forklift frame welding device includes a fork arm support comprising a base and a body support extending upward from one end of the base, the upper end of the body support having a first functional hole; the frame positioning platform includes: The outer limiting seat is located on both sides of a pair of fork arm seats. The outer limiting seat is provided with a first limiting adjustment post that abuts against the outer wall of the base. The first limiting adjustment post is threadedly connected to the outer limiting seat. The lifting lug limiting frame includes a pair of support seats and a crossbeam connected between the pair of support seats. The crossbeam is provided with a lifting lug limiting post, which is connected to the first functional hole. A drive seat limiting bracket, which cooperates with the drive seat to limit the drive seat to the end of the fork arm seat. As a preferred embodiment of this application, based on the above device, the frame positioning platform is used to stably support and accurately position the various components of the forklift frame, ensuring that their relative positions remain unchanged during welding. The outer limiting bracket adapts to bases of different widths by adjusting the first limiting adjustment post, achieving lateral positioning of the fork arm seat; the lifting lug limiting bracket inserts the lifting lug limiting post into the first functional hole to complete the axial positioning and angular fixation of the vehicle body seat; the drive seat limiting bracket abuts against the drive seat from the outside, ensuring accurate contact between the connecting surface and the limiting surface, thereby improving welding accuracy and structural consistency.

[0009] Furthermore, in a large forklift frame welding device of this application, an inner limiting seat is provided on the crossbeam located inside the fork arm seat, and a third limiting adjustment column is provided on the inner limiting seat that abuts against the inner wall of the vehicle body seat. The third limiting adjustment column is threadedly connected to the inner limiting seat, and the lifting lug limiting column is installed on the inner limiting seat.

[0010] Furthermore, in a large forklift frame welding device of this application, the drive seat limiting frame is supported as a whole under the drive seat to support the drive seat. The drive seat limiting frame is provided with a transverse support plate, which is located on the side of the drive seat away from the fork arm seat. When the connecting seat moves to abut against the limiting surface, the transverse support plate is used to laterally press against the drive seat to prevent the drive seat from shifting in the moving direction of the connecting seat.

[0011] Furthermore, in this application, a large forklift frame welding device is provided, wherein the connecting frame includes a pair of side plates, and the side plates are provided with an arc-shaped slide rail and an obliquely extending straight slide rail, wherein the center of the arc-shaped slide rail is on the straight line where the bottom edge of the connecting surface is located. The movable frame includes a clamping frame and a drive frame. The drive frame is slidably connected to the clamping frame. The clamping frame has first limiting rollers on both sides, which are slidably disposed in an arc-shaped slide rail. The drive frame has second limiting rollers on both sides, which are slidably disposed in a straight slide rail. When the movable frame is in a first posture, the second limiting rollers are located at the high position of the straight slide rail and away from the limiting surface. When the movable frame is in a second posture, the second limiting rollers are located at the low position of the straight slide rail and close to the limiting surface. A drive spring connects the clamping frame and the drive frame. When the bottom edge of the connecting surface abuts against the limiting surface and the attitude limiting device releases its restriction on the movable frame, the drive spring applies a spring force to the drive frame, causing the movable frame to flip from the first attitude to the second attitude. As a preferred embodiment of this application, based on the above structure, the arc-shaped slide rail cooperates with the first limiting roller to ensure that the movable frame rotates around a fixed axis at point O during the flipping process, ensuring the stability and predictability of the flipping trajectory. The straight slide rail cooperates with the second limiting roller to convert the spring force into the initial driving force for flipping the movable frame. Because the straight slide rail extends obliquely downwards, during the flipping process, the momentum of the second limiting roller sliding along the straight slide rail coincides with the direction of the movable frame's flipping, thereby ensuring the continuity and reliability of the flipping action and avoiding jamming.

[0012] Since two points determine a straight line, the movable frame can ensure the stability of the movable frame in the first and second postures through the cooperation of a pair of limiting rollers and a pair of slides.

[0013] Furthermore, in the large forklift frame welding device of this application, when the movable frame is in the first posture, the connecting surface is in an upright posture. When the movable frame is in the first posture, the first limiting roller is located at the high position of the arc-shaped slide rail and away from the limiting surface. When the movable frame is in the second posture, the straight slide rail is located at the low position of the arc-shaped slide rail and close to the limiting surface. As a preferred embodiment of this application, during the rotation of the movable frame, the trajectory of the first limiting roller is a downward arc, and its momentum is consistent with the rotation direction of the connecting seat, which can further ensure the continuity and reliability of the rotation action and avoid jamming.

[0014] Furthermore, in this application, a large forklift frame welding device includes a clamping frame comprising: The first base support is used to support the bottom of the connecting seat. The first base support is provided with a fourth limiting adjustment post that abuts against the bottom of the connecting seat. The fourth limiting adjustment post is threadedly connected to the first base support. A clamping seat is located above the first base, and a clamping device is installed on the clamping seat. The clamping device is used to clamp the connecting seat onto the first base. The positioning side plate abuts against the side of the connecting seat away from the connecting surface. As a preferred embodiment of this application, after the connecting surface and the limiting surface are in contact, adjusting the fourth limiting adjustment column can adjust the position between the connecting seat and the drive seat to ensure the positioning accuracy between the drive seat and the connecting seat.

[0015] Furthermore, in this application, a large forklift frame welding device includes a telescopic cylinder as the clamping device. A positioning pin is connected to the movable component of the clamping device, and the side of the positioning pin is tapered. A second functional hole is provided on the top of the connecting seat. When the clamping device is activated, the positioning pin is inserted into the second functional hole, and the tapered surface presses against the edge of the second functional hole. As a preferred embodiment of this application, when the clamping device is reset, the positioning pin retracts from the second functional hole to release the positioning constraint on the connecting seat. Based on the above structure, precise positioning between the connecting seat and the movable frame can be achieved.

[0016] Furthermore, in this application, a large forklift frame welding device is provided, wherein the connecting frame includes a mounting seat located between a pair of side plates, a second base is provided at the bottom of the side plates, and a posture limiting device is installed on the mounting seat. The posture limiting device includes a drive cylinder and a pressing rod that is induced to be connected to the piston rod of the drive cylinder. When the movable frame is in the first posture, the second base supports the bottom of the connecting seat, and the pressing rod presses against the top of the connecting seat to limit the movable frame to the first posture; when the posture limiting device releases the limitation on the movable frame, the drive cylinder drives the pressing rod to move until it disengages from the top of the connecting seat.

[0017] The forklift frame welding process, based on a welding device, includes the following steps: S1: Position the fork arm seat and drive seat on the frame positioning platform, and weld the drive seat to one end of the fork arm seat using a welding device; S2: The connecting seat is clamped onto the movable frame by the clamping device, and the movable frame is limited to the first posture by the posture limiting device; S3: Move the connecting frame through the conveying device so that the bottom edge of the connecting surface abuts against the limiting surface at a preset position; S4: The attitude limiting device releases the limit on the movable frame, allowing the movable frame to flip to the second attitude, with the connecting surface and the limiting surface in contact. At this time, the two sides of the connecting seat are in contact with the inner walls of a pair of fork arm seats. S5: The two sides of the connecting seat are welded and fixed to the inner wall of the fork arm seat by a welding device; S6: The clamping device releases its grip on the connector, and the conveying device drives the connector frame to reset, so as to make room for the remaining welding. S7: The welding device continues to weld and fix the connecting seat to other components, including the drive seat.

[0018] As can be seen from the above technical solution, the present invention has the following beneficial effects: This invention provides a welding device and process for large forklift frames. Through a connecting seat transfer device (including a conveying device, a connecting frame, and a movable frame), the handling, positioning, and welding preparation processes of the connecting seat are integrated into an automated system. This eliminates the reliance on manual labor or independent conveying devices for handling in existing technologies, achieving automatic delivery and precise positioning of the connecting seat, reducing intermediate operation steps and auxiliary time. After completing the critical welding between the connecting seat and the fork arm seat (S5), the clamping device can release its grip, and the transfer device can reset to make room for welding (S6). This means that welding robots or welders can immediately and continuously weld the connecting seat and other components such as the drive seat (S7) without waiting for the disassembly of the positioning fixture. The previously separate steps of handling, positioning, fixture disassembly, and welding are integrated into an automated, sequential, and continuous process. Operators only need to perform simple operations such as clamping, starting, and monitoring, reducing reliance on skilled workers and minimizing quality risks caused by errors in multiple stages of operation. Therefore, it fundamentally solves the problem of welding interruption caused by the need to disassemble the positioning frame in the existing technology, realizes the continuity of the welding process, and significantly improves the overall welding operation efficiency.

[0019] Furthermore, the connecting seat transfer device based on this application utilizes the contact between the bottom edge of the connecting surface and the limiting surface of the drive seat in the "first posture" as the initial positioning reference. Subsequently, through the controllable rotation of the movable frame, the connecting seat is naturally and accurately guided into the "second posture," ensuring complete contact between the connecting surface and the limiting surface. This mechanically guided positioning method has high repeatability and effectively avoids deviations that may occur during manual placement, ensuring the precise position of the connecting seat in the frame. The clamping device and the posture limiting device work together to firmly maintain the posture of the connecting seat during transfer and positioning, preventing it from moving or deforming before welding, providing a solid foundation for obtaining a stable and high-quality welded joint. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the forklift frame welding device in Embodiment 1 of this application; Figure 2 This is a schematic diagram of the forklift frame structure in the embodiments of this application; Figure 3 for Figure 2 Schematic diagram showing the positional relationship between the drive unit and the connecting unit; Figure 4 This is a structural schematic diagram of the forklift frame welding device in Embodiment 2 of this application (State 1). Figure 5 This is a structural schematic diagram of the forklift frame welding device in Embodiment 2 of this application (State 2). Figure 6This is a schematic diagram of the vehicle frame positioning platform in Embodiment 2 of this application; Figure 7 This is a schematic diagram of the connecting frame in Embodiment 2 of this application; Figure 8 This is a schematic diagram of the movable frame in Embodiment 2 of this application; Figure 9 A three-dimensional schematic diagram of the positional relationship between the movable frame and the connecting frame (in the first posture); Figure 10 A three-dimensional schematic diagram of the positional relationship between the movable frame and the connecting frame (in the second posture); Figure 11 This is a plan view showing the positional relationship between the movable frame and the connecting frame (in the first posture). Figure 12 Force analysis diagram of the spring on the movable frame when in the first and second postures; Figure 13 This is a plan view showing the positional relationship between the movable frame and the connecting frame (in the second posture).

[0021] In the diagram: 1-Forklift frame; 11-Fork arm mount; 111-Base; 112-Body mount; 1120-First functional hole; 121-Drive mount; 1210-Limiting surface; 122-Connecting mount; 1220-Connecting surface; 1221-Second functional hole; 2-Chassis positioning platform; 21-Outer limiting seat; 211-First limiting adjustment column; 22-Inner limiting seat; 221-Support seat; 222-Crossbeam; 223-Hanger lug limiting column; 224-Inner limiting seat; 225-Third limiting adjustment column; 23-Drive seat limiting frame; 231-Transverse support plate; 3-Welding apparatus; 4-Connecting seat transfer device; 41-Conveying device; 42-Connecting frame; 421-Side plate; 422-Arc-shaped slide rail; 423-Straight slide rail; 424-Mounting seat; 425-Second base support; 43-Modible frame; 431-Clamping frame; 4311-First base support; 4312-Clamping seat; 4313-Positioning side plate; 4314-Fourth limit adjustment column; 432-First limit roller; 433-Second limit roller; 434-Drive frame; 435-Drive spring; 5-Attitude limiting device; 51-Drive cylinder; 52-Pressure rod; 6-Clamping device; 61-Positioning pin. Detailed Implementation

[0022] Example 1 Combination Figures 1 to 3 As shown Several components are welded into a forklift frame 1. The components include a pair of fork arm seats 11, a drive seat 121, and a connecting seat 122. The drive seat 121 is connected to one end of the pair of fork arm seats 11. The drive seat 121 has an inclined limiting surface 1210 on the side near the fork arm seats 11. The connecting seat 122 has a connecting surface 1220 connected to the limiting surface 1210. The connecting seat 122 is located between the pair of fork arm seats 11. The two sides of the connecting seat 122 are welded to the inner sidewalls of the pair of fork arm seats 11 respectively. During welding, one end of the drive seat 121 should be welded to the fork arm seat 11 first, and then the connecting seat 122 should be placed on the inclined limiting surface 1210 on the drive seat 121 to weld the connecting seat 122 between the drive seat 121 and the fork arm seat 11.

[0023] To ensure the positioning accuracy between the connector 122 and the drive seat 121, the welding process in this embodiment is as follows: Figure 1 As shown, a detachable positioning frame is provided at the lower end of the connecting seat 122. The positioning surface on the positioning frame supports the bottom surface of the connecting seat 122 and forms a V-shape with the limiting surface 1210 to achieve positioning of the connecting seat 122.

[0024] Example 2 Combination Figure 4 and Figure 5 As shown, unlike Embodiment 1, this embodiment provides a welding device for welding the forklift frame 1 in Embodiment 1, including: Frame positioning platform 2, which is used to place and position the forklift frame 1; Welding device 3, which is used to weld the workpiece; The connecting seat transfer device 4 includes a conveying device 41, a connecting frame 42 and a movable frame 43. The connecting frame 42 is mounted on the conveying device 41, and the movable frame 43 is connected to the side of the connecting seat 122 away from the drive seat 121. The movable frame 43 is movably mounted on the connecting frame 42 and can rotate on the connecting frame 42. The attitude limiting device 5 is installed on the connecting frame 42. The attitude limiting device 5 is used to limit the movable frame 43 as follows: Figure 11 The movable frame 43 is in the first position. In this position, the conveying device 41 can move the connecting frame 42 horizontally so that the bottom edge of the connecting surface 1220 abuts against the limiting surface 1210. In this case, when the posture limiting device 5 releases its restriction on the movable frame 43, the movable frame 43 can rotate around the bottom edge of the connecting surface 1220 on the connecting frame 42 until the connecting surface 1220 is in contact with the limiting surface 1210. At this time, the movable frame 43 is in the second position. Figure 13 As shown; The clamping device 6 is mounted on the movable frame 43 and is used to clamp the connecting seat 122.

[0025] In this embodiment, the welding device 3 is a conventional arc welding robot. The conveying device 41 is a ceiling-rail conveyor, which moves horizontally along a preset track to drive the overall displacement of the connecting frame 42. Specifically, the connecting surface 1220 is composed of a pair of laterally extending plate edges.

[0026] Combination Figure 6 As shown, further, in this embodiment, the fork arm seat 11 includes a base 111 and a body seat 112 extending upward from one end of the base 111, the upper end of the body seat 112 being provided with a first functional hole 1120; the frame positioning platform 2 includes: The outer limiting seat 21 is located on both sides of a pair of fork arm seats 11. The outer limiting seat 21 is provided with a first limiting adjustment post 211 that abuts against the outer wall of the base 111. The first limiting adjustment post 211 is threadedly connected to the outer limiting seat 21. The lifting lug limiting frame 22 includes a pair of support seats 221 and a crossbeam 222 connected between the pair of support seats 221. The crossbeam 222 is provided with a lifting lug limiting post 223, and the lifting lug limiting post 223 is connected to the first functional hole 1120. The drive seat limit bracket 23 cooperates with the drive seat 121 to limit the drive seat 121 to the end of the fork arm seat 11.

[0027] Based on the above-mentioned device, the frame positioning platform 2 is used to stably support and accurately position the various components of the forklift frame 1, ensuring that their relative positions remain unchanged during the welding process. The outer limiting seat 21 adapts to the base 111 of different widths by adjusting the first limiting adjustment column 211, thereby achieving lateral positioning of the fork arm seat 11; the lifting lug limiting frame 22 is inserted into the first functional hole 1120 through the lifting lug limiting column 223, completing the axial positioning and angular fixation of the body seat 112; the drive seat limiting frame 23 abuts against the drive seat 121 from the outside, ensuring that the connecting surface 1220 and the limiting surface 1210 are accurately fitted, thereby improving welding accuracy and structural consistency.

[0028] In this embodiment, the support base 221 is provided with a second limiting adjustment post that abuts against the outer wall of the fork arm seat 11, and the second limiting adjustment post is threadedly connected to the support base 221.

[0029] Furthermore, in this embodiment, the crossbeam 222 is provided with a pair of inner limiting seats 224 located inside the fork arm seat 11. The inner limiting seats 224 are provided with a third limiting adjustment post 225 that abuts against the inner wall of the vehicle body seat 112. The third limiting adjustment post 225 is threadedly connected to the inner limiting seats 224, and the lifting lug limiting post 223 is installed on the inner limiting seats 224. By setting up the inner and outer double-sided limiting structure, in conjunction with the adjustable limiting adjustment post, precise constraints on the multi-degree-of-freedom of the forklift frame are achieved, effectively preventing displacement and deformation during the welding process, and improving the overall assembly accuracy and stability.

[0030] Furthermore, in this embodiment, the drive seat limiting frame 23 is supported entirely below the drive seat 121 to support the drive seat 121. The drive seat limiting frame 23 is provided with a transverse support plate 231, which is located on the side of the drive seat 121 away from the fork arm seat 11. When the connecting seat 122 moves to abut against the limiting surface 1210, the transverse support plate 231 is used to laterally press against the drive seat 121 to prevent the drive seat 121 from shifting in the moving direction of the connecting seat 122.

[0031] Combination Figures 7 to 10 As shown, further, in this embodiment, the connecting frame 42 includes a pair of side plates 421, and the side plates 421 are provided with an arc-shaped slide rail 422 and an obliquely extending straight slide rail 423. The center O of the arc-shaped slide rail 422 is on the straight line where the bottom edge of the connecting surface 1220 is located. The movable frame 43 includes a clamping frame 431 and a drive frame 434. The drive frame 434 is slidably connected to the clamping frame 431. The clamping frame 431 is provided with first limiting rollers 432 on both sides. The first limiting rollers 432 are slidably disposed in the arc-shaped slide rail 422. The drive frame 434 is provided with second limiting rollers 433 on both sides. The second limiting rollers 433 are slidably disposed in the straight slide rail 423. When the movable frame 43 is in the first posture, the second limiting rollers 433 are located at the high position of the straight slide rail 423 and away from the limiting surface 1210. When the movable frame 43 is in the second posture, the second limiting rollers 433 are located at the low position of the straight slide rail 423 and close to the limiting surface 1210. A drive spring 435 is connected between the clamping frame 431 and the drive frame 434. When the bottom edge of the connecting surface 1220 abuts against the limiting surface 1210 and the posture limiting device 5 releases the limitation on the movable frame 43, the drive spring 435 is used to apply elastic force to the drive frame 434 so that the movable frame 43 flips from the first posture to the second posture.

[0032] Based on the above structure, combined with the cooperation of the arc-shaped slide 422 and the first limiting roller 432, and the fact that the center O of the arc-shaped slide 422 lies on the straight line of the bottom edge of the connecting surface 1220, a rotating pair is formed to ensure that the movable frame 43 can rotate smoothly during the flipping process. Figure 11 The slide rotates about point O on a fixed axis, ensuring the stability and predictability of the flipping trajectory. The cooperation between the linear slide 423 and the second limiting roller 433, as shown... Figure 12As shown, the elastic force F1 of the drive spring 435 can be converted into an initial driving force N1 for rotating the movable frame 43. Because the straight slide rail 423 extends obliquely downwards, during the rotation process, the momentum of the second limiting roller 433 sliding along the straight slide rail 423 coincides with the direction of rotation of the movable frame 43, thus ensuring the continuity and reliability of the rotation action and avoiding jamming. Since two points determine a straight line, the movable frame 43, through the cooperation of a pair of limiting rollers and a pair of slide rails, can ensure the stability of the movable frame 43 in the first and second postures. Specifically, the drive spring 435 includes a pair of tension springs, with both ends detachably connected to the clamping frame 431 and the drive frame 434, respectively. Compared to using a drive device such as a cylinder to rotate the movable frame 43, the above device has the advantages of quick response and simple control. Furthermore, the drive spring 435 is located on the movable frame 43, rather than between the movable frame 43 and the connecting frame 42, which helps to reduce the overall size of the device and improve structural compactness.

[0033] Furthermore, in this embodiment, as Figure 12 As shown, when the movable frame 43 is in the first posture, the direction of the initial driving force N1 is the same as that of direction a; when the movable frame 43 is in the second posture, the direction of the end braking force N2 is opposite to that of direction a. in: The initial driving force N1 is the component of the force F1 of the driving spring 435 acting on the driving frame 434 when the movable frame 43 is in the first posture, along the moving direction of the straight slide 423. Direction a is the direction of movement of the drive frame 434 relative to the straight slide 423 during the process of the movable frame 43 flipping towards the second posture; The end braking force N2 is the component of the force F2 of the drive spring 435 acting on the drive frame 434 when the movable frame 43 is in the second posture, along the moving direction of the straight slide 423.

[0034] Based on the above principle, during the flipping process of the movable frame 43 towards the second posture, the drive spring 435 can generate a force opposite to the direction of movement of the drive frame 434 relative to the linear slide 423, thus achieving a buffering effect. Therefore, in this embodiment, the drive spring 435 serves both to initiate the flipping and to buffer the movement before it ends. This design offers the advantage of good structural rationality.

[0035] Furthermore, in this embodiment, as Figure 11 and 13As shown, when the movable frame 43 is in the first posture, the connecting surface 1220 is in an upright posture. When the movable frame 43 is in the first posture, the first limiting roller 432 is located at the high position of the arc-shaped slide 422 and away from the limiting surface 1210. When the movable frame 43 is in the second posture, the straight slide 423 is located at the low position of the arc-shaped slide 422 and close to the limiting surface 1210. That is, during the rotation of the movable frame 43, the trajectory of the first limiting roller 432 is a downward arc, and its momentum is consistent with the rotation direction of the connecting seat 122, which can further ensure the continuity and reliability of the rotation action and avoid jamming.

[0036] Furthermore, in this embodiment, the clamping frame 431 includes: The first base 4311 is used to support the bottom of the connecting seat 122. The first base 4311 is provided with a fourth limiting adjustment post 4314 that abuts against the bottom of the connecting seat 122. The fourth limiting adjustment post 4314 is threadedly connected to the first base 4311. A clamping seat 4312 is located above the first base 4311. A clamping device 6 is installed on the clamping seat 4312 and is used to clamp the connecting seat 122 onto the first base 4311. The positioning side plate 4313 abuts against the side of the connecting seat 122 away from the connecting surface 1220.

[0037] After the connecting surface 1220 is in contact with the limiting surface 1210, the position between the connecting seat 122 and the driving seat 121 can be adjusted by adjusting the fourth limiting adjustment column 4314 to ensure the positioning accuracy between the driving seat 121 and the connecting seat 122.

[0038] Furthermore, in this embodiment, the clamping device 6 is a telescopic cylinder, and a positioning post 61 is connected to the movable component of the clamping device 6. The side of the positioning post 61 is a tapered surface, and the top of the connecting seat 122 is provided with a second functional hole 1221. When the clamping device 6 is started, the positioning post 61 is inserted into the second functional hole 1221, and the tapered surface is pressed against the edge of the second functional hole 1221.

[0039] When the clamping device 6 is reset, the positioning pin 61 retracts from the second functional hole 1221 to release the positioning constraint on the connecting seat 122. Based on the above structure, precise positioning between the connecting seat 122 and the movable frame 43 can be achieved.

[0040] In this embodiment, the connecting frame 42 includes a mounting base 424 located between a pair of side plates 421. A second base support 425 is provided at the bottom of each side plate 421. An attitude limiting device 5 is mounted on the mounting base 424. The attitude limiting device 5 includes a drive cylinder 51 and a pressing rod 52 that is kinetically connected to the piston rod of the drive cylinder 51. The pressing rod 52 and the piston rod of the drive cylinder 51 are as follows: Figure 9 and Figure 10The transmission connection shown is achieved through an existing linkage mechanism.

[0041] When the movable frame 43 is in the first posture, the second base 425 is supported on the bottom of the connecting seat 122, and the pressing rod 52 is pressed against the top of the connecting seat 122 to limit the movable frame 43 to the first posture; when the posture limiting device 5 releases the limitation on the movable frame 43, the drive cylinder 51 drives the pressing rod 52 to move until it is disengaged from the top of the connecting seat 122.

[0042] Specifically, the posture limiting devices 5 are installed in pairs on both sides of the movable frame 43.

[0043] Example 3 The forklift frame welding process, based on the welding apparatus of Example 2, includes the following steps: S1: Position the fork arm seat 11 and drive seat 121 on the frame positioning platform 2, and weld the drive seat 121 to one end of the fork arm seat 11 using the welding device 3. S2: Combination Figure 4 and Figure 9 As shown, the connecting seat 122 is clamped onto the movable frame 43 by the clamping device 6, and the movable frame 43 is limited to the first posture by the posture limiting device 5. S3: The connecting frame 42 is moved by the conveying device 41 so that the bottom edge of the connecting surface 1220 abuts against the limiting surface 1210 at a preset position; S4: Combination Figure 5 and Figure 10 As shown, the posture limiting device 5 releases the restriction on the movable frame 43, causing the movable frame 43 to flip to the second posture, and the connecting surface 1220 and the limiting surface 1210 are in contact. At this time, the two sides of the connecting seat 122 are in contact with the inner walls of the pair of fork arm seats 11. S5: The two sides of the connecting seat 122 are welded and fixed to the inner wall of the fork arm seat 11 by the welding device 3; S6: The clamping device 6 releases its grip on the connecting seat 122, and the conveying device 41 drives the connecting frame 42 to reset, so as to make room for the remaining welding. S7: Welding device 3 continues to weld and fix the connecting seat 122 to other components including the drive seat 121.

[0044] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can conceive of other specific embodiments of the invention without creative effort, and these embodiments will all fall within the scope of protection of the present invention.

Claims

1. A large forklift frame welding device, characterized in that: Used to weld several parts into a forklift frame (1), the parts including a drive seat (121) and a connecting seat (122); the drive seat (121) has an inclined limiting surface (1210) on one side, and the connecting seat (122) has a connecting surface (1220) connected to the limiting surface (1210). include: A frame positioning platform (2) is used to place and position the forklift frame (1). Welding device (3), which is used to weld the workpiece; The connecting seat transfer device (4) includes a conveying device (41), a connecting frame (42) and a movable frame (43). The connecting frame (42) is mounted on the conveying device (41), and the movable frame (43) is connected to the side of the connecting seat (122) away from the drive seat (121). The movable frame (43) is movably mounted on the connecting frame (42) and can rotate on the connecting frame (42). The attitude limiting device (5) is provided on the connecting frame (42). The attitude limiting device (5) is used to limit the movable frame (43) to the first attitude. At this time, the conveying device (41) can move the connecting frame (42) in the horizontal direction so that the bottom edge of the connecting surface (1220) abuts against the limiting surface (1210). In this case, when the attitude limiting device (5) releases the limitation on the movable frame (43), the movable frame (43) can be flipped around the bottom edge of the connecting surface (1220) on the connecting frame (42) until the connecting surface (1220) and the limiting surface (1210) are in contact. At this time, the movable frame (43) is in the second attitude. A clamping device (6) is provided on the movable frame (43) for clamping the connecting seat (122).

2. The large forklift frame welding device according to claim 1, characterized in that: The component includes a pair of fork arm seats (11), and the drive seat (121) is connected to one end of the pair of fork arm seats (11). The limiting surface (1210) is located at the end of the drive seat (121) near the fork arm seats (11). The fork arm seat (11) includes a base (111) and a body seat (112) extending upward from one end of the base (111). The upper end of the body seat (112) is provided with a first functional hole (1120). The frame positioning platform (2) includes: The outer limiting seat (21) is located on both sides of a pair of fork arm seats (11). The outer limiting seat (21) is provided with a first limiting adjustment post (211) that abuts against the outer wall of the base (111). The first limiting adjustment post (211) is threadedly connected to the outer limiting seat (21). The lifting lug limiting frame (22) includes a pair of support seats (221) and a crossbeam (222) connected between the pair of support seats (221). The crossbeam (222) is provided with a lifting lug limiting post (223), and the lifting lug limiting post (223) is connected to the first functional hole (1120). A drive seat limit bracket (23) cooperates with the drive seat (121) to limit the drive seat (121) to the end of the fork arm seat (11).

3. The large forklift frame welding device according to claim 2, characterized in that: The crossbeam (222) is provided with an inner limiting seat (224) located inside the fork arm seat (11). The inner limiting seat (224) is provided with a third limiting adjustment post (225) that abuts against the inner wall of the vehicle body seat (112). The third limiting adjustment post (225) is threadedly connected to the inner limiting seat (224). The lifting lug limiting post (223) is installed on the inner limiting seat (224).

4. The large forklift frame welding device according to claim 2, characterized in that: The drive seat limiting frame (23) is supported as a whole under the drive seat (121). The drive seat limiting frame (23) is provided with a transverse support plate (231), which is located on the side of the drive seat (121) away from the fork arm seat (11).

5. A large forklift frame welding device according to claim 1, characterized in that: The connecting frame (42) includes a pair of side plates (421), and the side plates (421) are provided with an arc-shaped slide (422) and an obliquely extending straight slide (423). The center of the arc-shaped slide (422) is on the straight line where the bottom edge of the connecting surface (1220) is located. The movable frame (43) includes a clamping frame (431) and a drive frame (434). The drive frame (434) is slidably connected to the clamping frame (431). The clamping frame (431) is provided with first limiting rollers (432) on both sides. The first limiting rollers (432) are slidably disposed in the arc-shaped slide rail (422). The drive frame (434) is provided with second limiting rollers (433) on both sides. The second limiting rollers (433) are slidably disposed in the straight slide rail (423). When the movable frame (43) is in the first posture, the second limiting rollers (433) are located at the high position of the straight slide rail (423) and away from the limiting surface (1210). When the movable frame (43) is in the second posture, the second limiting rollers (433) are located at the low position of the straight slide rail (423) and close to the limiting surface (1210). A drive spring (435) is connected between the clamping frame (431) and the drive frame (434). When the bottom edge of the connecting surface (1220) abuts against the limiting surface (1210) and the posture limiting device (5) releases the limitation on the movable frame (43), the drive spring (435) applies elastic force to the drive frame (434) to make the movable frame (43) flip from the first posture to the second posture.

6. A large forklift frame welding device according to claim 5, characterized in that: When the movable frame (43) is in the first posture, the connecting surface (1220) is in an upright posture. When the movable frame (43) is in the first posture, the first limiting roller (432) is located at the high position of the arc-shaped slide (422) and away from the limiting surface (1210). When the movable frame (43) is in the second posture, the straight slide (423) is located at the low position of the arc-shaped slide (422) and close to the limiting surface (1210).

7. A large forklift frame welding device according to claim 5, characterized in that: The clamping frame (431) includes: The first base (4311) is used to support the bottom of the connecting seat (122). The first base (4311) is provided with a fourth limiting adjustment post (4314) that abuts against the bottom of the connecting seat (122). The fourth limiting adjustment post (4314) is threadedly connected to the first base (4311). A clamping seat (4312) is located above a first base (4311), and a clamping device (6) is mounted on the clamping seat (4312) for clamping the connecting seat (122) onto the first base (4311); The positioning side plate (4313) abuts against the side of the connecting seat (122) away from the connecting surface (1220).

8. A large forklift frame welding device according to claim 1, characterized in that: The clamping device (6) is a telescopic cylinder. A positioning column (61) is connected to the movable component of the clamping device (6). The side of the positioning column (61) is a conical surface. The top of the connecting seat (122) is provided with a second functional hole (1221). When the clamping device (6) is started, the positioning column (61) is inserted into the second functional hole (1221), and the conical surface is pressed against the edge of the second functional hole (1221).

9. A large forklift frame welding device according to claim 5, characterized in that: The connecting frame (42) includes a mounting base (424) located between a pair of side plates (421), and a second base support (425) is provided at the bottom of the side plates (421). The posture limiting device (5) is mounted on the mounting base (424), and the posture limiting device (5) includes a drive cylinder (51) and a pressing rod (52) that is drivenly connected to the piston rod of the drive cylinder (51). When the movable frame (43) is in the first posture, the second base (425) is supported on the bottom of the connecting seat (122), and the pressing rod (52) is pressed against the top of the connecting seat (122) to limit the movable frame (43) to the first posture; when the posture limiting device (5) releases the limitation on the movable frame (43), the drive cylinder (51) drives the pressing rod (52) to move until it is disengaged from the top of the connecting seat (122).

10. A forklift frame welding process, based on the welding apparatus of claim 2, comprising the following steps: S1: Position the fork arm seat (11) and drive seat (121) on the frame positioning platform (2), and weld the drive seat (121) to one end of the fork arm seat (11) using the welding device (3); S2: The connecting seat (122) is clamped onto the movable frame (43) by the clamping device (6), and the movable frame (43) is limited to the first posture by the posture limiting device (5); S3: The connecting frame (42) is moved by the conveying device (41) so that the bottom edge of the connecting surface (1220) abuts against the limiting surface (1210) at a preset position; S4: The posture limiting device (5) releases the limitation on the movable frame (43), causing the movable frame (43) to flip to the second posture, and the connecting surface (1220) and the limiting surface (1210) are in contact. At this time, the two sides of the connecting seat (122) are in contact with the inner wall of a pair of fork arm seats (11). S5: Weld the two sides of the connecting seat (122) to the inner wall of the fork arm seat (11) by welding device (3); S6: The clamping device (6) releases the clamp on the connecting seat (122), and the conveying device (41) drives the connecting frame (42) to reset, so as to make room for the remaining welding space; S7: The welding device (3) continues to weld and fix the connecting seat (122) to other parts including the drive seat (121).

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