Forklift gantry welding positioning device

Abstract

The invention relates to the field of forklift welding, in particular to a forklift gantry welding positioning device which comprises a supporting frame, a stand column fixing mechanism used for fixing gantry stand columns, a part positioning mechanism used for driving parts to move, a plurality of feeding mechanisms and a control unit. And the control unit is electrically connected with the stand column fixing mechanism and the component positioning mechanism. The stand column fixing mechanism is used for clamping, fixing and rotating positioning of the portal stand column, the part positioning mechanism is arranged for moving and positioning parts, the whole process is controlled by a motor, the automation degree of portal welding and the welding positioning precision are improved, and the production efficiency is improved. Meanwhile, various parts can be clamped and fixed through the part positioning mechanism, and the welding tool does not need to be replaced.

Description

Technical Field

[0001] The invention relates to the field of forklift welding, in particular to a forklift door frame welding positioning device. Background Art

[0002] As an industrial handling vehicle, a forklift can realize short-distance cargo loading, unloading and stacking. The forklift mast is an important component of the forklift. In order to ensure that the stacking height or loading and unloading height of the forklift is sufficient, the forklift mast is often configured to form a telescopic structure consisting of a slide, a primary mast and a secondary mast. When welding the forklift mast, it is first necessary to pre-fix the components by spot welding, and then perform secondary welding for reinforcement after the pre-fixation of the components is completed. At present, when pre-fixing each component, a clamping device is usually used for manual positioning or a welding tool is used to position the component.

[0003] At present, a Chinese invention patent application with publication number CN 221435445 U and publication date July 30, 2024 proposes a first-level gantry welding tooling, including a base, two first positioning seats, two second positioning seats, two third positioning seats, two fourth positioning seats, two fifth positioning seats and a sixth positioning seat.

[0004] When in use, first place each component on a corresponding positioning seat, which can support and fix the component, and then weld and fix each component.

[0005] With respect to the above-mentioned related technologies, a specific first-level gantry can be welded and positioned. When welding a second-level gantry or welding other components on the first-level gantry, other types of tooling need to be replaced for auxiliary positioning. Moreover, since there are many components on the forklift gantry and the types and positions of welded components on each forklift gantry are the same, when using welding tooling or clamping devices to position the components, it is necessary to replace multiple welding tooling or clamping devices for positioning, which wastes time. Summary of the invention

[0006] In order to improve the efficiency of forklift door frame positioning welding and optimize the assembly tooling used in the forklift door frame positioning welding process, the present invention provides a forklift door frame welding positioning device.

[0007] The present invention provides a forklift door frame welding positioning device, which adopts the following technical solution: A forklift gantry welding positioning device comprises a supporting frame, wherein the supporting frame is provided with a column fixing mechanism, a component positioning mechanism, a feeding mechanism and a control unit, wherein the column fixing mechanism is used to fix the gantry column on the supporting frame, and the mounting surface of the gantry column is fixedly installed on the column fixing mechanism facing the component positioning mechanism; the component positioning mechanism comprises a sliding assembly, a lifting assembly, a telescopic assembly and a component clamping piece, wherein the sliding assembly is arranged at the side of the column fixing mechanism along the length direction of the gantry column, the lifting assembly is fixedly arranged at the moving end of the sliding assembly, and the lifting assembly slides along the length direction of the column The lifting assembly is movably installed on the sliding assembly, the telescopic assembly is installed on the moving end of the lifting assembly, the telescopic assembly is slidably installed on the lifting assembly along the vertical direction, the component clamp is installed on the moving end of the telescopic assembly, the component clamp is slidably installed on the telescopic assembly along the direction perpendicular to the length of the gantry column, the sliding assembly, the lifting assembly and the telescopic assembly are all electrically connected to the control unit; there are multiple feeding mechanisms, and the multiple feeding mechanisms are all fixedly arranged on one side of the component positioning mechanism close to the column fixing mechanism, and various components are placed one by one in the corresponding feeding mechanisms along a specific direction.

[0008] By adopting this technical solution, when welding and positioning the forklift mast, first, the mast column is fixedly installed on the column fixing mechanism. When the mast column is fixed on the column fixing mechanism, the mounting surface of the column needs to be set toward the side component positioning mechanism. Secondly, the parts to be installed are placed one by one in the corresponding feeding mechanism. When the parts are placed in the corresponding feeding mechanism, the mounting surface of the parts needs to be set toward the column. In this way, there is no need to adjust the angle of the parts when installing the parts. It is only necessary to move the parts a specific distance so that the mounting surface of the parts and the mounting surface of the mast column are in contact. Finally, the sliding assembly, lifting assembly and telescopic assembly are respectively set in the control unit when installing different parts. The distance from the corresponding feeding mechanism to the installation position is sufficient. When the component positioning mechanism moves different components to the installation position, the components are first clamped and fixed in the order of the telescopic component contracting, the sliding component moving to the corresponding position of the component, the lifting component moving to the corresponding height of the component, the telescopic component extending to the side of the feeding mechanism, and the component clamping and fixing the component. Secondly, the sliding component moves to the corresponding position of the installation position, the lifting component moves to the corresponding height of the installation position, and the telescopic component extends to the mounting surface of the component and the mounting surface of the mast column to achieve the movement and positioning of the component. Finally, the mounting surface of the component and the mounting surface of the column are contacted by electric welding. In this way, after the component positioning mechanism clamps and fixes the components in the feeding mechanism according to a specific installation angle, the control unit is used to control the component positioning mechanism to drive the components to move and position. On the one hand, different movement routes can be set in the control unit according to the installation positions of different components; on the other hand, the control unit controls the movement of the components, which can effectively control the accuracy of the movement of the components and improve the accuracy of the welding positioning of the components on the forklift mast.

[0009] Optionally, the column fixing mechanism includes a column telescopic member, a first driving member and two groups of fixed clamping assemblies symmetrically mounted on the support frame, the two groups of fixed clamping assemblies are symmetrically arranged on the opposite inner end surfaces of the support frame along the length direction of the support frame, the column telescopic member is fixedly arranged between one group of the fixed clamping assemblies and the support frame, and the telescopic direction of the column telescopic member is consistent with the length direction of the support frame; the fixed clamping assembly includes a first rotating member, a load-bearing arm fixedly mounted on the first rotating member and two groups of column clamping assemblies symmetrically arranged about the axis of the first rotating member, one of the first rotating members is fixedly mounted on the On the movable end of the column telescopic member, another first rotating member is fixedly installed on the supporting frame, the load-bearing arm is fixedly installed on the movable end of the first rotating member, the load-bearing arm is symmetrically arranged about the axis of the first rotating member, and two groups of column clamping assemblies are respectively installed at the two ends of the load-bearing arm; the first rotating member on one side or both sides is transmission-connected with the first driving member, and the first driving member is electrically connected with the control unit; two component positioning mechanisms are correspondingly arranged with the column clamping assemblies, the two component positioning mechanisms are symmetrically arranged about the axis of the first rotating member, and the component positioning mechanisms are arranged one by one on the side of the column clamping assembly.

[0010] The structure of the forklift mast is generally symmetrically arranged. By adopting this technical solution, when the column is fixedly installed, firstly, the distance of the column telescopic member extending out is adjusted according to the length of the column, and then the distance between the two column clamping assemblies is adjusted. Secondly, the two columns of the forklift mast are respectively fixedly installed on two sets of symmetrically arranged fixed clamping assemblies. Finally, the first driving member is controlled to rotate so that the load-bearing arm drives the mast column to rotate and adjust the angle of the mast column installation surface. When the parts are moved and positioned, two component positioning mechanisms symmetrically arranged on the side of the fixed clamping assembly are used to clamp and move the parts. In this way, the parts can be positioned and moved to the columns on both sides at the same time. On the one hand, the moving and positioning on both sides can improve the installation efficiency. On the other hand, when the mast crossbeam is moved and positioned, the crossbeam can be clamped and moved on both sides to realize the installation and positioning of the mast crossbeam and the mast column; the column telescopic member can flexibly adjust the distance between the column clamping assemblies according to the mast columns of different sizes, realize the welding and positioning of mast columns of various sizes, and increase the applicability of the device.

[0011] Optionally, the column clamping assembly includes a second rotating member fixedly mounted on the load-bearing arm, a column clamping member fixedly mounted on the movable end of the second rotating member, and a column positioning member fixedly mounted on the column clamping member, wherein a second driving member is provided on the load-bearing arm on one side, wherein the second rotating member on one side is transmission-connected with the second driving member, and the second driving member is electrically connected to the control unit.

[0012] By adopting this technical solution, when fixing the portal column, the installation position of the portal column is first debugged, and after the debugging is completed, the positioning piece is abutted against one side of the portal column and fixed on the clamping piece, so that when the portal column is subsequently installed and positioned, the portal column is abutted against the positioning piece to determine the installation position of the portal column, and then the clamping piece is used to clamp and position the portal column at the current position, and finally the second driving piece is controlled to drive the second rotating piece to drive the clamping piece and the portal column to rotate, and the installation surface of the portal column is set toward the component positioning mechanism. The arrangement of such positioning parts makes it possible to quickly determine the installation position of the portal column, thereby effectively improving the installation efficiency of the portal column. At the same time, since different components need to be installed at different positions on the portal column, the portal column can be driven to rotate by the second driving member driving the second rotating member and the clamping member to rotate, thereby adjusting the different installation surfaces of the portal column to be arranged toward the component positioning mechanism. Different components can be moved and positioned on the corresponding installation surfaces of the portal column without re-disassembling the portal column, thereby improving the efficiency of component welding and positioning.

[0013] Optionally, the column fixing mechanism also includes a column measuring assembly, which includes at least three distance sensors, and multiple of the distance sensors are fixedly arranged on the side of the column clamping assembly. The multiple distance sensors are distributed in a triangular shape in a vertical plane and are all arranged toward the column clamping assembly. The mounting surfaces of the multiple distance sensors are parallel to the mounting surface of the component positioning mechanism.

[0014] By adopting this technical solution, when the column clamping assembly drives the gantry column to rotate until the mounting surface of the gantry column faces the component positioning mechanism, the three distance sensors respectively measure the distance between the distance sensor and the mounting surface of the gantry column. Since the three distance sensors are distributed in a triangular shape in the vertical plane, the three distance sensors can measure the parallelism between the mounting surface of the gantry column and the mounting surface of the component positioning mechanism, and can also measure the distance between the mounting surface of the gantry column and the mounting surface of the component positioning mechanism. In this way, the position of the column clamping assembly and the component positioning mechanism can be more accurately controlled during the installation and debugging of the column clamping assembly and the component positioning mechanism, and the accuracy of the welding positioning of the gantry column and the components can be improved; at the same time, it can also play a monitoring role in the subsequent welding positioning process, so as to timely detect the deviation of the gantry column and improve the yield rate of the welded gantry.

[0015] Optionally, the column measurement assembly also includes a projection device, which is fixedly mounted on the support frame, arranged toward the column clamping assembly, electrically connected to the control unit, and used to project an installation position reference line onto the installation surface of the portal column.

[0016] By adopting this technical solution, after the mounting surface of the portal column is fixed by the column measuring assembly, the projection device is turned on. Since the mounting surface of the portal column faces the mounting surface of the component positioning mechanism and the projection device is arranged toward the column clamping assembly, the projection device will directly project reference lines of the mounting positions of each component on the mounting surface of the portal column, so that the component positioning mechanism can serve as a reference when moving the component to the mounting surface of the portal column, and thus timely discover the problem of inaccurate positioning when the installation position of the component is inconsistent with the position of the reference line, thereby improving the accuracy of component welding positioning and improving the yield rate of forklift portal frame welding.

[0017] Optionally, the component clamping parts are at least two electromagnets, the end faces of the two electromagnets facing the door frame column are located in the same plane, and the two electromagnets are electrically connected to the control unit; the feeding mechanism includes a shell and a guide assembly, the end face of the shell away from the column fixing mechanism is provided with a guide groove, the guide groove and the electromagnet are arranged in coordination, the end face of the shell close to the component positioning mechanism is provided with an outlet, the guide assembly is arranged inside the shell, and the guide assembly is used to control the moving direction of the parts inside the shell.

[0018] Since the forklift mast plays a load-bearing role, the material used to make the forklift mast is generally high-strength alloy steel. Most alloy steels are ferromagnetic and can be attracted by electromagnets. By adopting this technical solution, an electromagnet is used as a component clamp, and two electromagnets are used to adsorb the components at the same time. The two electromagnets clamp and fix the components in different directions, which can increase the stability of the component clamp adsorbing the components. When the electromagnet clamps the component, the control unit first controls the electromagnet to not be energized, and then the electromagnet moves to the guide groove. The control unit controls the electromagnet to be energized again, and the electromagnet adsorbs and fixes the component from the end of the component away from the mounting surface. Finally, the electromagnet drives the component to move from the exit on the shell to the outside of the shell and moves the component to the installation position. When the component is placed in the shell, the mounting surface of the component needs to be set toward the mounting surface of the mast column, and the component is placed in the shell at a specific installation angle, so that the component can be moved to the installation position only by translation, and the guide assembly can move the next component to the guide groove along a specific angle after one component moves away. In this way, the electromagnet is used as a component clamp, which simplifies the way of fixing the components, can effectively increase the speed of fixing and loosening the components, and improve work efficiency; the setting of the guide groove and the guide assembly can simplify the way of moving the components, thereby improving the accuracy of the components when they are moved to the installation position.

[0019] Optionally, the guide assembly includes a slide groove and a push rod, a plurality of first positioning holes are provided at the bottom of the shell, a plurality of second positioning holes are provided at the bottom of the slide groove to cooperate with the first positioning holes, one end of the slide groove extends to the outlet of the shell, and the slide groove is used to limit the moving direction of the component; the fixed end of the push rod is installed inside the shell, the movable end of the push rod is in contact with the component, the extension direction of the push rod is consistent with the extension direction of the slide groove, and the push rod is used to push the component in the slide groove to the guide groove.

[0020] By adopting this technical solution, the slide groove is set according to the installation direction of the component, and the angle of the component when the component moves along the slide groove to the guide groove position is the angle during installation, and the push rod pushes the component along the slide groove from the end away from the guide groove to the guide groove position along the direction of the slide groove, thereby helping the component to move more stably along the slide groove to the guide groove position, making the relative position of the component and the guide groove more precise, so that each time the clamping member clamps and fixes the component at the guide groove position, the relative position of the clamping member and the component can remain consistent, thereby improving the accuracy of the component when it is moved and positioned to the mounting surface of the portal column.

[0021] Optionally, the sliding assembly includes a slide rail, a horizontal slider, a horizontal screw rod and a first motor, the slide rail is fixedly arranged on the support frame, the extension direction of the slide rail is parallel to the mounting surface of the portal column, the slide rail is arranged on the side of the column clamping assembly, the horizontal screw rod is rotatably installed above the slide rail, the axial direction of the horizontal screw rod is consistent with the extension direction of the slide rail, the first motor is fixedly installed on the slide rail and is transmission connected to the horizontal screw rod, the first motor is electrically connected to the control unit, the horizontal slider is slidably installed above the slide rail and is transmission connected to the horizontal screw rod, and the lifting assembly is fixedly installed on the horizontal slider.

[0022] By adopting this technical solution, the control unit controls the first motor to work and then drives the horizontal screw to rotate. The horizontal slider cooperates with the horizontal screw so that the horizontal slider can move in a square along the axial direction of the horizontal screw, and the axial direction of the horizontal screw is parallel to the mounting surface of the portal column, so that the horizontal slider can move in a direction parallel to the mounting surface of the portal column. The slide rail provides sliding support for the horizontal slider under the horizontal slider, and when the load-bearing device is installed on the horizontal slider, the deformation of the horizontal slider caused by the horizontal slider can be reduced, thereby improving the stability of the movement of the horizontal slider. The horizontal screw is used to drive the horizontal slider, so the moving distance of the horizontal screw can be controlled more accurately.

[0023] The cam is a chain which has a first end mounted on the horizontal slider and a second end mounted on the horizontal slider, the second end being mounted on the slider to move the first and second wheels, the second end being mounted on the slider to move the first and second wheels, respectively.

[0024] When the horizontal slider moves on the slide rail, since the lifting assembly, telescopic assembly, holding assembly and parts are all carried on the horizontal slider, one end of the horizontal slider needs to bear a large weight, which in turn causes the end of the horizontal slider close to the lifting assembly to be pressed against the slide rail, which in turn causes serious friction between the horizontal slider and the slide rail. By adopting this technical solution, a roller support plate is provided below the side of the slide rail close to the lifting assembly and a second roller is provided below the horizontal slider, so that the roller support plate can roll and support the horizontal slider below the horizontal slider on the side of the horizontal slider close to the lifting assembly, thereby reducing the friction between the horizontal slider and the slide rail. At the same time, in order to reduce the pressure of the horizontal slider on the horizontal lead screw, a roller pressure plate is provided above the slide rail and a first roller is provided above the horizontal slider. The roller pressure plate can roll and support the horizontal slider above the horizontal slider, thereby reducing the pressure of the horizontal slider on the horizontal lead screw. In this way, a lever can be formed with the contact point between the second roller and the roller support plate as the fulcrum, and the contact point between the first roller and the roller pressure plate and the contact point between the horizontal slider and the lifting assembly as two force points, and the pressure of the horizontal slider on the horizontal screw rod arranged between the first roller and the fulcrum is reduced, thereby reducing the deformation of the horizontal screw rod and at the same time reducing the pressure of the horizontal slider on the slide rail arranged between the second roller and the fulcrum, thereby reducing the friction between the horizontal slider and the horizontal screw rod, optimizing the force at both ends of the horizontal slider, and improving the stability and accuracy of the movement of the horizontal slider.

[0025] Optionally, the lifting assembly is fixed in the vertical direction on a side of the horizontal sliding block close to the column fixing mechanism; the telescopic assembly includes a guide rail, a first connecting block fixedly installed in the guide rail, a second connecting block slidably installed in the guide rail, a driving screw installed inside the guide rail, a third connecting block, two connecting rods rotatably connected to both sides of the third connecting block and a third motor, the guide rail is fixedly installed on the moving end of the lifting assembly, the third motor is fixedly installed on the guide rail and is transmission-connected to the driving screw, one end of one of the connecting rods is rotatably connected to the first connecting block, and the other end is rotatably connected to the third connecting block, one end of the other connecting rod is rotatably connected to the second connecting block, and the other end is rotatably connected to an end of the third connecting block away from the first connecting block, and the driving screw is used to drive the second connecting block to move in the guide rail; the component clamp is fixedly installed on one end of the third connecting block close to the column fixing mechanism.

[0026] By adopting this technical solution, the lifting assembly can drive the telescopic assembly to move in the vertical direction. When the telescopic assembly is extended, the third motor controls the driving screw to rotate, and the driving screw drives the second connection block to move in the direction close to the first connection block. When the second connection block moves in the direction of the first connection block, the connecting rods on both sides of the third connection block rotate respectively and then lift the third connection block to the side close to the column fixing mechanism, so that the third connection block is extended; when the telescopic assembly is retracted, the third motor controls the driving screw to rotate in the opposite direction, and the driving screw drives the second connection block to move in the direction away from the first connection block. At this time, the connecting rods on both sides of the third connection block rotate and then pull the third connection block back to the side away from the column fixing mechanism, so that the third connection block is retracted. In this way, the articulated telescopic structure is used to drive the component clamp to move in the direction close to or away from the column fixing mechanism. On the one hand, the entire structure of the telescopic assembly can be set on the side of the lifting assembly close to the column fixing structure, reducing the probability of interference between the telescopic assembly and the sliding assembly. On the other hand, the length of the guide rail can be flexibly adjusted according to the distance between the door frame column and the component positioning mechanism, without considering the influence of the length of the telescopic assembly on the installation position, making the structural layout more compact.

[0027] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The column fixing mechanism can clamp and fix the portal column, and can adjust the angle of the portal column mounting surface so that the mounting surface of the portal column can be set toward the component positioning mechanism. By setting the component positioning mechanism, the components to be welded on the portal column are moved and positioned, and the mounting surface of the components to be installed on the portal column is set toward the portal column, so that when the components are moved to the mounting surface of the portal column, the mounting surface of the components can be set opposite to the mounting surface of the portal column, and then the mounting surface of the components and the mounting surface of the portal column can be positioned and welded. During the whole process, the rotation positioning of the portal column and the movement of the components are controlled by the motor, which improves the degree of automation of the portal welding and the accuracy of welding positioning. At the same time, the component positioning mechanism can clamp and fix a variety of components, and set different moving routes according to the installation positions of different components, so that the positioning device in the present application can complete the positioning welding of most parts in the forklift portal frame, reduce the trouble of replacing welding tooling, and improve the welding positioning efficiency.

[0028] 2. Since most forklift masts are symmetrically arranged, two groups of symmetrical column clamping assemblies are arranged on the column fixing mechanism, and two groups of component positioning mechanisms are symmetrically arranged on both sides of the two groups of symmetrical column clamping assemblies. Each group of component positioning mechanisms and each group of column clamping assemblies are arranged correspondingly, so that the mast columns symmetrically arranged on both sides of the forklift mast can be welded and positioned at the same time, thereby further improving the welding efficiency. In addition, when welding the mast crossbeam, the component positioning mechanisms on both sides can be used to clamp both sides of the mast crossbeam at the same time and drive the mast crossbeam to move, thereby realizing the movement and positioning of the mast crossbeam, and improving the stability of the mast crossbeam movement and the accuracy of positioning.

[0029] 3. Multiple distance sensors and projection devices are arranged on the column fixing mechanism. The multiple distance sensors can measure the orientation of the mounting surface of the gantry column when the column fixing mechanism controls the rotation of the gantry column by a three-point plane method, thereby making the mounting surface of the gantry column better parallel to the mounting surface of the component, thereby increasing the accuracy of welding; the projection device can project the reference line of the component installation position on the mounting surface of the gantry column for auxiliary positioning when the gantry column is oriented correctly, and then after the component positioning mechanism moves the component to the mounting surface of the gantry column, it is compared with the reference line, so as to promptly discover the problem of inaccurate positioning and reduce the output rate of low-quality forklift masts.

[0030] 4. Install a feeding mechanism on the support frame, and set corresponding slide grooves and push rods in the feeding mechanism. When installing components in the feeding mechanism, set corresponding slide grooves according to the installation angles of the components on the portal column. The installation angles of the components can be adjusted on the feeding mechanism without adjusting the installation angles during the movement of the components, thereby reducing the movement parameters of the component positioning mechanism and reducing the probability of errors. The push rod can apply pressure to the components during the movement of the components, thereby improving the stability of the movement of the components in the slide groove, thereby improving the consistency of the position and angle of the components when they are discharged from the feeding mechanism, and improving the accuracy of welding positioning when the components are moved to the mounting surface of the portal column. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the first state of the overall structure of an embodiment of the present invention; Figure 2 is a schematic diagram of the second state of the overall structure of an embodiment of the present invention; Figure 3 is a schematic diagram of a column fixing structure according to an embodiment of the present invention; Figure 4 yes Figure 3 A partial enlarged schematic diagram of part I; Figure 5 is a top view of the overall structure of an embodiment of the present invention; Figure 6 yes Figure 5 Schematic cross-sectional view of AA in the figure; Figure 7 yes Figure 6 A partial enlarged schematic diagram of part II; Figure 8 is a schematic diagram of a component positioning mechanism according to an embodiment of the present invention; Fig. 9 yes Figure 8 A partial enlarged schematic diagram of part III.

[0032] Description of reference numerals: 1. Support frame; 2. Column fixing mechanism; 21. Column telescopic member; 22. First driving member; 23. Fixed clamping assembly; 231. First rotating member; 232. Load-bearing arm; 24. Column clamping assembly; 241. Second rotating member; 242. Column clamping member; 243. Column positioning member; 244. Second driving member; 25. Column measuring assembly; 251. Distance sensor; 252. Projection device; 3. Component positioning mechanism; 31. Sliding assembly; 311. Slide rail; 312. Horizontal slider; 313. Horizontal lead screw; 314. First motor; 32. Lifting assembly; 33 , telescopic assembly; 331, guide rail; 332, driving screw; 333, first connecting block; 334, second connecting block; 335, third connecting block; 336, connecting rod; 337, third motor; 34, component clamp; 341, electromagnet; 35, roller assembly; 351, first roller; 352, second roller; 353, roller pressure plate; 354, roller support plate; 4, feeding mechanism; 41, shell; 411, guide groove; 412, outlet; 413, first positioning hole; 42, guide assembly; 421, slide groove; 422, push rod; 423, second positioning hole; 5, control unit. DETAILED DESCRIPTION

[0033] The following combination Figures 1 to 9 The present invention is described in further detail.

[0034] The embodiment of the present invention discloses a forklift door frame welding positioning device. Figure 1 to Figure 2A forklift gantry welding positioning device mainly includes a support frame 1, a column fixing mechanism 2 fixedly installed in the middle position of the support frame 1, a component positioning mechanism 3 fixedly installed on both sides of the support frame 1, a feeding mechanism 4 fixedly installed on the support frame 1 and a control unit 5 for controlling the movement of the column fixing mechanism 2 and the component positioning mechanism 3, wherein the component positioning mechanism 3 is symmetrically arranged with two groups about the support frame 1, and the two groups of component positioning mechanisms 3 are respectively arranged on the outside of the column fixing mechanism 2, and the feeding mechanism 4 is provided with multiple types of parts to be installed, and the positions of the multiple feeding mechanisms 4 are matched with the installation positions of the component positioning mechanisms 3, and the control unit 5 is electrically connected with the column fixing mechanism 2 and the component positioning mechanism 3. When welding the portal frame, firstly, the two portal columns are symmetrically mounted on the column fixing mechanism 2, and then the components to be welded on the portal columns are placed in the corresponding feeding mechanism 4, and then the installation angle of the portal column on the column fixing mechanism 2 is set in the control unit 5 so that the installation surface of the portal column faces the component positioning mechanism 3, and the position where the component positioning mechanism 3 takes materials from the feeding mechanism 4 and the installation position of the component on the installation surface of the portal column driven by the component positioning mechanism 3 are set in the control unit 5, and the moving route is set for debugging and optimization, and finally, after the component positioning mechanism 3 drives the component to move to a specific position on the installation surface of the portal column, the installation surface of the component and the installation surface of the portal column can be manually or automatically welded and fixed.

[0035] Reference Figure 3 to Figure 4The column fixing mechanism 2 includes a column telescopic member 21, a first driving member 22, a fixed clamping assembly 23 and a column clamping assembly 24. The support frame 1 is arranged on both sides of the column fixing mechanism 2, and a control unit 5 is arranged inside the support frame 1 on one side. The fixed clamping assembly 23 is provided with two groups and is respectively installed on the support frames 1 on both sides. The two groups of fixed clamping assemblies 23 are arranged opposite to each other on the inner side of the support frame 1. The fixed clamping assembly 23 includes a first rotating member 231 and a load-bearing arm 232. The first rotating member 231 and the first driving member 22 are installed on the support frame 1 on the side where the control unit 5 is installed. The first rotating member 231 includes a bearing seat fixedly installed on the support frame 1 and a bearing rotatably installed inside the bearing seat. The first driving member 22 is a three-phase motor and the first driving member 22 is connected to the bearing transmission of the fixed clamping assembly 23 through a gear set; the column telescopic member 21 and the fixed clamping assembly 23 are installed on the support frame 1 on the other side, the column telescopic member 21 is arranged on the support frame 1 and is driven by the hydraulic cylinder, the bearing seat of the first rotating member 231 is fixedly installed at the protruding end of the hydraulic cylinder, and the bearing of the first rotating member 231 is rotatably installed inside the bearing seat; the load-bearing arm 232 is fixedly arranged on the bearing, and the load-bearing arm 232 is symmetrically arranged about the bearing, and the column clamping assembly 24 is provided with four groups, and the four groups of column clamping assemblies 24 are symmetrically arranged on the load-bearing arms 232 on both sides, and two groups of column clamping assemblies 24 are symmetrically arranged at both ends of each load-bearing arm 232.

[0036] Reference Figure 4The column clamping assembly 24 includes a second rotating member 241, a column clamping member 242 and a column positioning member 243. The second rotating member 241 is rotatably mounted on the end of the load-bearing arm 232. The second rotating member 241 includes a sleeve shaft fixedly mounted on the load-bearing arm 232 and a rotating shaft rotatably mounted in the sleeve shaft. The column clamping member 242 includes a load-bearing plate fixedly arranged on the rotating shaft and an oil cylinder installed on one side of the load-bearing plate. The extension direction of the oil cylinder is set toward the load-bearing plate on the other side. The gantry column is placed between the two load-bearing plates. The oil cylinder extends out of one side of the gantry column and presses the gantry column to the other side against the load-bearing plate to fix the gantry column. The column positioning assembly includes a right-angle connecting plate fixedly arranged on the load-bearing plate and a limiting plate fixedly arranged on the right-angle connecting plate. A slot is set on one side of the right-angle connecting plate, and a slot is passed through the slot. By installing bolts in the slots, the right-angle connecting plate can be fixed on the load-bearing plate, the limit plate can be fixed on the other side of the right-angle connecting plate, and fixed on the right-angle connecting plate by screws. After the door frame column is fixed and clamped, one side of the limit plate is attached to the side of the door frame column, and then the right-angle connecting plate is fixed on the load-bearing plate to fix the position of the column positioning member 243. Then, when the door frame column is installed later, the bottom edge of the door frame column is placed on the inner side of the load-bearing plate, and the edge of the door frame column is attached to the limit plate to position the door frame column, thereby realizing the rapid positioning and installation of the door frame column; a second driving member 244 is also provided on the load-bearing arm 232 close to the first driving member 22, and the second driving member 244 is connected to the rotating shaft of the second rotating member 241 to realize the control of the door frame column to rotate.

[0037] Reference Figures 5 to 7The component positioning mechanism 3 includes a sliding assembly 31, a lifting assembly 32, a telescopic assembly 33 and a component clamping piece 34. The component positioning mechanism 3 is symmetrically arranged with two groups about the column fixing mechanism 2. The two ends of the sliding assembly 31 are respectively fixed on the supporting frames 1 on both sides. The lifting assembly 32 is arranged on the relatively inner side of the sliding assembly 31, the telescopic assembly 33 is arranged on the relatively inner side of the lifting assembly 32, and the component clamping piece 34 is arranged on the relatively inner side of the telescopic assembly 33. The sliding assembly 31 includes a slide rail 311, a horizontal slider 312, a horizontal screw rod 313 and a first motor 314. The slide rail 311 is arranged in the horizontal direction, and the extension direction of the slide rail 311 is consistent with the rotation axis of the fixed clamping assembly 23. The horizontal screw rod 313 extends along the slide rail 311. The horizontal guide rod 313 is rotatably mounted on the guide rail 311, and the first motor 314 is fixedly mounted at one end of the guide rail 311. One end of the horizontal guide rod 313 is rotatably mounted on the guide rail 311, and the other end is connected to the output shaft of the first motor 314. The horizontal slider 312 is slidably mounted on the guide rail 311, and a guide rod sleeve shaft cooperating with the sliding assembly 31 is arranged in the middle of the horizontal slider 312. When the first motor 314 drives the horizontal guide rod 313 to rotate, the horizontal slider 312 and the horizontal guide rod 313 cooperate to slide on the guide rail 311 along the axial direction of the horizontal guide rod 313. In order to reduce the pressure of the horizontal slider 312 on the guide rail 311 and the horizontal guide rod 313 when the horizontal slider 312 slides on the guide rail 311, a roller assembly 35 is arranged on the horizontal slider 312.

[0038] Reference Figure 7The roller assembly 35 includes a first roller 351, a second roller 352, a roller pressure plate 353 and a roller support plate 354. The first roller 351 is arranged at one end of the horizontal slider 312 away from the lifting assembly 32, and the distance sensor 251 is arranged on the side of the horizontal slider 312 away from the slide rail 311. In cooperation with the first roller 351, a roller pressure plate 353 is arranged above the slide rail 311. A roller groove corresponding to the position of the first roller 351 is opened on the roller pressure plate 353. The first roller 351 rolls in the roller groove to enable the roller pressure plate 353 to support the first roller 351 from above. The second roller 352 is arranged at one end of the horizontal slider 312 close to the lifting assembly 32, and the second roller 352 is arranged on the end surface of the horizontal slider 312 opposite to the first roller 351. In cooperation with the second roller 352, a roller support plate 354 is arranged on the side of the slide rail 311 close to the lifting assembly 32 The support plate 354 and the roller support plate 354 are arranged below the horizontal slider 312, and the second roller 352 rolls on the upper end surface of the roller support plate 354 to realize that the roller support plate 354 supports the second roller 352 from below. Since the screw rod is located between the first roller 351 and the second roller 352 on the horizontal slider 312, and the first roller 351 and the second roller 352 are supported by the roller pressure plate 353 and the roller support plate 354 respectively, the horizontal slider 312 will not cause excessive pressure on the horizontal screw rod 313, thereby reducing the compression deformation of the horizontal screw rod 313. At the same time, a lever system is formed with the second roller 352 as the fulcrum and the contact points of the first roller 351 and the horizontal slider 312 with the lifting component 32 as two force points, which can optimize the force condition of the horizontal slider 312 and reduce the unilateral force condition of the horizontal slider 312 close to the lifting component 32.

[0039] Reference Figure 8 A column measuring component 25 is also installed on the slide rail 311. The column measuring component 25 includes a distance sensor 251 and a projection device 252. The distance sensor 251 is arranged on the side of the slide rail 311 close to the column fixing mechanism 2, and there are three distance sensors 251. The three distance sensors 251 are distributed in an isosceles triangle. The mounting surfaces of the three distance sensors 251 are vertical surfaces and the vertical surfaces are parallel to the axial direction of the horizontal screw rod 313. The projection device 252 is fixedly arranged above the slide rail 311, and there are three projection devices 252 along the extension direction of the slide rail 311 to prevent the lifting component 32 from blocking one of the projection devices 252, resulting in failure to project normally on the mounting surface of the door frame column.

[0040] Reference Figures 8 to 9The lifting assembly 32 is a ball screw fixedly mounted on the side of the horizontal slider 312 close to the column fixing mechanism 2. The ball screw is arranged in the vertical direction, and the sliding assembly 31 is provided with two in the vertical direction, so as to support the lifting assembly 32 at the upper and lower positions, and enhance the stability of the lifting assembly 32 during horizontal movement. The telescopic assembly 33 is fixedly mounted on the moving end of the lifting assembly 32. The telescopic assembly 33 includes a guide rail 331, a driving screw rod 332, a first connecting block 333, a second connecting block 334, a third connecting block 335, a connecting rod 336 and a third motor 337. In order to maximize the use of the lifting space of the lifting assembly 32, the guide rail 331 in this embodiment is arranged in the horizontal direction. In other embodiments, the installation direction of the guide rail 331 is not restricted. The driving screw rod 332 is rotatably mounted in the guide rail 331. The third motor 337 is fixedly mounted on the outside of the guide rail 331 and is transmission-connected to the driving screw rod 332. The first connecting block 333 is fixedly mounted inside the guide rail 331, and the second connecting block 334 slides The guide rail 331 is rotatably installed inside the second connecting block 334, and the second connecting block 334 is transmission-connected with the driving screw rod 332. Two connecting rods 336 are rotatably installed on the first connecting block 333 and the second connecting block 334. The two ends of the third connecting rod 336 are rotatably connected with the connecting rods 336 rotatably installed on the first connecting block 333 and the second connecting block 334 respectively. When the third motor 337 rotates, it drives the second connecting block 334 to move through the driving screw rod 332, and the second connecting block 334 moves closer to the first connecting block 333. When the second connecting block 334 moves in the direction away from the first connecting block 333, the third connecting block 335 will be pulled back in the direction close to the driving screw rod 332 by the connecting rod 336, so as to retract the third connecting rod 336. This structure realizes the telescopic function of the telescopic assembly 33, and at the same time will not interfere with the sliding assembly 31 on the side of the lifting assembly 32 away from the telescopic assembly 33.

[0041] Reference Figure 7 and Fig. 9 The component clamp 34 includes two electromagnets 341 installed on the third connecting block 335. The electromagnets 341 are electrically connected to the control unit 5. When the electromagnets 341 are energized, magnetism can be generated to adsorb and fix the components.

[0042] Reference Figure 3 , Figure 6 and Figure 8The feeding mechanism 4 includes a shell 41 and a guide assembly 42, wherein a first positioning hole 413 is provided at the bottom of the shell 41, a support rod is provided on the support frame 1, and a second positioning hole 423 is provided on the support rod. The shell 41 is fixedly installed on the support frame 1 through the first positioning hole 413 and the second positioning hole 423. A guide groove 411 is provided on one side of the shell 41 close to the component positioning mechanism 3, and an outlet 412 is also provided above the guide groove 411. When the parts are installed in the shell 41, the electromagnet 341 can be inserted into the guide groove 411 when the telescopic assembly 33 is extended, and contact and adsorb with the parts in the shell 41 to be fixed, and then the electromagnet 341 moves along the direction of the guide groove 411 to take the parts out from the outlet 412; the guide assembly 42 is located inside the shell 41, and the guide assembly 42 includes a slide groove 421 and a push rod 422. In this embodiment, the slide groove 421 is a slide groove 421 with a groove structure opened inside the shell 41 according to the shape of the parts. In other embodiments, the slide groove 421 can also be A guide rod is arranged inside the shell 41 to form a slide groove 421 of a track structure, and the push rod 422 is driven by a cylinder. At the same time, the extension direction of the push rod 422 is arranged to match the extension direction of the slide groove 421. A flexible pad is arranged at one end of the push rod 422 close to the guide groove 411. When the push rod 422 is extended, the flexible pad contacts the component and pushes the component to the position of the guide groove 411; for different components, the shell 41 and the slide groove 421 should be arranged in different shapes, and the installation position of the shell 41 is not restricted; in this embodiment, in order to improve space utilization and facilitate the component positioning mechanism 3 to clamp and fix the component and the stability when clamping the component, the shell 41 is arranged below the column fixing mechanism 2. When it is necessary to weld components such as a portal beam or a connecting rod 336 above the portal column, the feeding mechanism 4 can be arranged above the column fixing mechanism 2; the feeding mechanism 4 can also be arranged below, and the fixed clamping assembly 23 can be controlled to drive the portal column to rotate, so as to adjust the relative position of the portal column and the portal beam.

[0043] The implementation principle of a forklift gantry welding positioning device according to an embodiment of the present invention is as follows: when the device of the present application is working, first, the gantry column is fixedly installed in the symmetrically arranged column clamping assembly 24. When the gantry column is installed in the column clamping assembly 24, it is necessary to adjust the position of the load-bearing arm 232 to be horizontal, and open the column clamping piece 242 to place the gantry column between the column clamping pieces 242, and then use the column positioning piece 243 to position it. After the positioning is completed, the column clamping piece 242 clamps and fixes the gantry column; secondly, the direction of the gantry column mounting surface is adjusted through the column measuring assembly 25, and the distance sensor 251 is turned on to measure the positions of the three distance sensors 251 from the gantry column mounting surface respectively. When the distances measured by the three distance sensors 251 are the same or less than the error value, it proves that the mounting surface of the gantry column is facing the component positioning mechanism 3. When the distance difference measured by the three distance sensors 251 is too large, the second rotating piece 241 is adjusted to drive the gantry column to rotate until the distances measured by the three distance sensors 251 are the same or less than the error value. value; place the parts in the corresponding feeding mechanism 4 again, and set the position of the part positioning mechanism 3 in each feeding mechanism 4 for taking materials and the installation position of the part positioning mechanism 3 on the installation surface in the control unit 5, set the welding order of the parts in the control unit 5, and set the coordinate values ​​for each feeding mechanism 4 and the installation surface of each part, the control unit 5 controls the sliding assembly 31 and the lifting assembly 32 to move at each coordinate value, and the telescopic assembly 33 moves to the corresponding coordinate value to extend the set distance, clamps and fixes the parts in the feeding mechanism 4 or moves the parts to the installation surface of the portal column; finally, when the installation surface of the part contacts the installation surface of the portal column, a comparison test is performed through the projection device 252, and the portal column and each part are pre-fixed and welded in position by spot welding; when installing different installation surfaces of the portal column, the column clamping assembly 24 can be controlled to rotate by the second driving member 244, and the installation surfaces of different portal columns can be directed toward the part positioning mechanism 3 under the detection of the distance sensor 251.

[0044] In summary, in the present application, the column clamping assembly 24 can clamp and fix the gantry column, and adjust the angle of the gantry column mounting surface with the cooperation of the second driving member 244 and the distance sensor 251, so that the mounting surface of the gantry column faces the component positioning mechanism 3, the sliding assembly 31 and the lifting assembly 32 can drive the component clamping member 34 to move, and the telescopic assembly 33 extends out to clamp the component or move the component to the mounting surface of the gantry column when the component clamping member 34 moves to the corresponding position, thereby realizing the automatic welding positioning of various components of the forklift gantry and reducing the trouble of welding tooling; the rotation of the forklift gantry and the movement of the components are driven by a motor, which improves the accuracy of welding positioning compared with manual movement positioning; a plurality of distance sensors 251 and a projection device 252 are arranged on the column fixing mechanism 2, and the plurality of distance sensors 251 can measure the direction of the gantry column mounting surface when the column fixing mechanism 2 controls the rotation of the gantry column by a three-point plane determination method, thereby making the gantry column mounting surface better aligned with the components. The mounting surface is parallel to that of the portal column, thereby increasing the accuracy of welding; the projection device 252 can project the reference line of the component installation position on the mounting surface of the portal column when the portal column is facing correctly to assist in positioning, and then after the component positioning mechanism 3 moves the component to the mounting surface of the portal column, it is compared with the reference line to promptly discover the problem of inaccurate positioning; a corresponding slide groove 421 and a push rod 422 are set in the feeding mechanism 4, and when the component is installed in the feeding mechanism 4, the corresponding slide groove 421 is set according to the mounting angle of the component on the portal column, so that the mounting angle of the component can be adjusted in the feeding mechanism 4, and there is no need to adjust the mounting angle during the movement of the component, thereby reducing the movement parameters of the component positioning mechanism 3 and reducing the probability of errors; the push rod 422 can apply pressure during the movement of the component to improve the stability of the component movement in the slide groove 421, thereby improving the consistency of the position and angle of the component when it is discharged from the feeding mechanism 4, and improving the accuracy of welding positioning when the component is moved to the mounting surface of the portal column.

[0045] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A forklift gantry welding positioning device, comprising a support frame (1), characterized in that: The support frame (1) is provided with a column fixing mechanism (2), a component positioning mechanism (3), a feeding mechanism (4) and a control unit (5); the column fixing mechanism (2) is used to fix the portal column on the support frame (1); the mounting surface of the portal column is fixedly mounted on the column fixing mechanism (2) facing the component positioning mechanism (3); The component positioning mechanism (3) comprises a sliding assembly (31), a lifting assembly (32), a telescopic assembly (33) and a component clamp (34); the sliding assembly (31) is arranged on the side of the column fixing mechanism (2) along the length direction of the portal frame column; the lifting assembly (32) is fixedly arranged at the moving end of the sliding assembly (31); the lifting assembly (32) is slidably mounted on the sliding assembly (31) along the length direction of the column; the telescopic assembly (33) is mounted at the moving end of the lifting assembly (32); the telescopic assembly (33) is slidably mounted on the lifting assembly (32) in a vertical direction; the component clamp (34) is mounted at the moving end of the telescopic assembly (33); the component clamp (34) is slidably mounted on the telescopic assembly (33) in a direction perpendicular to the length of the portal frame column; the sliding assembly (31), the lifting assembly (32) and the telescopic assembly (33) are all electrically connected to the control unit (5); A plurality of the feeding mechanisms (4) are provided, and the plurality of feeding mechanisms (4) are all fixedly arranged on a side of the component positioning mechanism (3) close to the column fixing mechanism (2), and a plurality of components are placed one by one in the corresponding feeding mechanisms (4) along a specific direction.

2. A forklift mast welding positioning device according to claim 1, characterized in that: The column fixing mechanism (2) comprises a column telescopic member (21), a first driving member (22) and two groups of fixed clamping assemblies (23) symmetrically mounted on the support frame (1), the two groups of fixed clamping assemblies (23) being symmetrically arranged on opposite inner end surfaces of the support frame (1) along the length direction of the support frame (1), the column telescopic member (21) being fixedly arranged between one group of the fixed clamping assemblies (23) and the support frame (1), and the telescopic direction of the column telescopic member (21) being consistent with the length direction of the support frame (1); The fixed clamping assembly (23) comprises a first rotating member (231), a load-bearing arm (232) fixedly mounted on the first rotating member (231), and two groups of column clamping assemblies (24) symmetrically arranged about the axis of the first rotating member (231), wherein one of the first rotating members (231) is fixedly mounted on the movable end of the column telescopic member (21), the other first rotating member (231) is fixedly mounted on the supporting frame (1), the load-bearing arm (232) is fixedly mounted on the movable end of the first rotating member (231), the load-bearing arm (232) is symmetrically arranged about the axis of the first rotating member (231), and the two groups of column clamping assemblies (24) are respectively mounted at two ends of the load-bearing arm (232); The first rotating member (231) on one side or both sides is in transmission connection with the first driving member (22), and the first driving member (22) is electrically connected with the control unit (5); Two of the component positioning mechanisms (3) are arranged corresponding to the column clamping assembly (24); the two component positioning mechanisms (3) are arranged symmetrically about the axis of the first rotating member (231); and the component positioning mechanisms (3) are arranged one by one on the side of the column clamping assembly (24).

3. A forklift door frame welding positioning device according to claim 2, characterized in that: The column clamping assembly (24) comprises a second rotating member (241) fixedly mounted on the load-bearing arm (232), a column clamping member (242) fixedly mounted on the movable end of the second rotating member (241), and a column positioning member (243) fixedly mounted on the column clamping member (242), wherein a second driving member (244) is provided on the load-bearing arm (232) on one side, wherein the second rotating member (241) on one side is transmission-connected to the second driving member (244), and the second driving member (244) is electrically connected to the control unit (5).

4. A forklift mast welding positioning device according to claim 2, characterized in that: The column fixing mechanism (2) further comprises a column measuring assembly (25), the column measuring assembly (25) comprising at least three distance sensors (251), the plurality of distance sensors (251) being fixedly arranged on the side of the column clamping assembly (24), the plurality of distance sensors (251) being distributed in a triangular shape in a vertical plane and being arranged toward the column clamping assembly (24), and the mounting surfaces of the plurality of distance sensors (251) being parallel to the mounting surface of the component positioning mechanism (3).

5. A forklift door frame welding positioning device according to claim 4, characterized in that: The column measuring assembly (25) further comprises a projection device (252), the projection device (252) being fixedly mounted on the support frame (1), the projection device (252) being arranged towards the column clamping assembly (24), the projection device (252) being electrically connected to the control unit (5), and the projection device (252) being used to project an installation position reference line onto the installation surface of the portal column.

6. A forklift gantry welding positioning device according to any one of claims 1 to 5, characterized in that: The component clamping member (34) is at least two electromagnets (341), the end surfaces of the two electromagnets (341) facing the door frame column are located in the same plane, and the two electromagnets (341) are electrically connected to the control unit (5); The feeding mechanism (4) comprises a shell (41) and a guide assembly (42); a guide groove (411) is provided on an end surface of the shell (41) away from the column fixing mechanism (2); the guide groove (411) and the electromagnet (341) are arranged in cooperation; an outlet (412) is provided on an end surface of the shell (41) close to the component positioning mechanism (3); the guide assembly (42) is arranged inside the shell (41); and the guide assembly (42) is used to control the moving direction of the component inside the shell (41).

7. A forklift mast welding positioning device according to claim 6, characterized in that: The guide assembly (42) comprises a slide groove (421) and a push rod (422); a plurality of first positioning holes (413) are arranged at the bottom of the housing (41); a plurality of second positioning holes (423) are arranged at the bottom of the slide groove (421) to cooperate with the first positioning holes (413); one end of the slide groove (421) extends to the outlet (412) of the housing (41); and the slide groove (421) is used to limit the moving direction of the component; The fixed end of the push rod (422) is installed inside the housing (41), the movable end of the push rod (422) contacts the component, the extension direction of the push rod (422) is consistent with the extension direction of the slide groove (421), and the push rod (422) is used to push the component in the slide groove (421) to the guide groove (411).

8. A forklift gantry welding positioning device according to any one of claims 2 to 5, characterized in that: The sliding assembly (31) comprises a sliding rail (311), a horizontal slider (312), a horizontal screw rod (313) and a first motor (314); the sliding rail (311) is fixedly arranged on the supporting frame (1); the extension direction of the sliding rail (311) is parallel to the mounting surface of the door frame column; the sliding rail (311) is arranged on the side of the column clamping assembly (24); the horizontal screw rod (313) is rotatably mounted above the sliding rail (311); the axial direction of the horizontal screw rod (313) is consistent with the extension direction of the sliding rail (311); the first motor (314) is fixedly mounted on the sliding rail (311) and is transmission-connected to the horizontal screw rod (313); the first motor (314) is electrically connected to the control unit (5); the horizontal slider (312) is slidably mounted above the sliding rail (311) and is transmission-connected to the horizontal screw rod (313); and the lifting assembly (32) is fixedly mounted on the horizontal slider (312).

9. A forklift mast welding positioning device according to claim 8, characterized in that: The sliding assembly (31) further comprises a roller assembly (35), wherein the roller assembly (35) comprises a first roller (351) rotatably mounted on the horizontal slider (312), a second roller (352) rotatably mounted on the horizontal slider (312), a roller pressure plate (353) mounted above the horizontal slider (312), and a roller support plate (354) mounted below the horizontal slider (312); The first roller (351) is mounted on an end of the horizontal slider (312) away from the lifting assembly (32), and the first roller (351) is mounted on a side of the horizontal slider (312) away from the slide rail (311); the roller pressure plate (353) is fixedly mounted above the slide rail (311), and the lower end surface of the roller pressure plate (353) is in rotational contact with the outer peripheral surface of the first roller (351); the roller pressure plate (353) is used to support the upper side of the first roller (351); The second roller (352) is mounted on one end of the horizontal slider (312) close to the lifting assembly (32), and the second roller (352) is mounted on one side of the horizontal slider (312) close to the slide rail (311); the roller support plate (354) is fixedly mounted below the slide rail (311), and the upper end surface of the roller support plate (354) is in rotational contact with the outer peripheral surface of the second roller (352); the roller support plate (354) is used to support the lower side of the second roller (352).

10. A forklift mast welding positioning device according to claim 8, characterized in that: The lifting assembly (32) is fixed in the vertical direction on a side of the horizontal sliding block (312) close to the column fixing mechanism (2); The telescopic assembly (33) comprises a guide rail (331), a first connecting block (333) fixedly mounted in the guide rail (331), a second connecting block (334) slidably mounted in the guide rail (331), a driving screw (332) mounted inside the guide rail (331), a third connecting block (335), two connecting rods (336) rotatably connected to both sides of the third connecting block (335), and a third motor (337); the guide rail (331) is fixedly mounted on the moving end of the lifting assembly (32); the third motor (337) is fixedly mounted Installed on the guide rail (331) and drivingly connected to the driving screw rod (332), one end of one of the connecting rods (336) is rotatably connected to the first connecting block (333), and the other end is rotatably connected to the third connecting block (335), another connecting rod (336) has one end rotatably connected to the second connecting block (334), and the other end is rotatably connected to an end of the third connecting block (335) away from the first connecting block (333), and the driving screw rod (332) is used to drive the second connecting block (334) to move in the guide rail (331); The component clamp (34) is fixedly mounted on one end of the third connecting block (335) close to the column fixing mechanism (2).

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