A welding tool for a forklift truck tail frame

Abstract

The utility model relates to a forklift part machining technical field, concretely relates to a kind of assembly welding tool of forklift tail frame, including bottom positioning assembly, bottom positioning assembly includes the center support base of forming positioning reference;Forward positioning assembly is set at the center support base front, and forward positioning assembly can be clamped and positioned forklift tail frame forward with the center support base;Rear positioning assembly is set at the center support base rear, and rear positioning assembly includes the V-shaped centering plate matched with bent plate, and V-shaped centering plate can be clamped and positioned forklift tail frame rear with the center support base.The utility model forms forklift tail frame positioning reference by bottom positioning assembly, forms positioning by forward positioning assembly to limit forklift tail frame to move forward, forms positioning by V-shaped centering plate to limit tail plate to move rear, so that the degree of freedom of forklift tail frame horizontal direction is zero, and then guarantee the positional relationship between each component in the welding process of forklift tail frame, guarantee the structure precision after forklift tail frame welding.

Description

Technical Field

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

[0002] The forklift tail carriage is the core load-bearing and connecting structure at the rear of the forklift frame. It uses counterweights to counteract the tipping moment of the cargo at the forks, preventing the forklift from tilting forward during operation. For example... Figure 1 and Figure 2 As shown, the main structure of the forklift tail carriage includes a support center plate 601. A first fixed plate 602 and a second fixed plate 603 with a folded design are welded to the left and right sides of the support center plate 601, respectively. Limiting ribs 604 are welded to the bottom of the two plates to support their bending. A counterweight fixing plate is welded to the upper front side of the support center plate 601. Parallel support plates 606 are welded to the lower front and lower rear sides of the support center plate 601. A V-shaped bent plate 607 is horizontally welded to the support plate 606 at the rear side. The support plate 606 and the bent plate 607 are reinforced by a tail rib 608 to enhance their structural strength. A limiting hole 609 is formed in the middle of the support center plate 601. A Z-shaped counterweight connecting seat 610 is welded between the support plates 606 on the front and rear sides. The open end of the counterweight connecting seat 610 is fixedly connected to the forklift frame with bolts. The existing forklift tailstock welding process usually involves using a combination crane and welding fixtures to position, clamp, spot weld, and weld the parts in a certain sequence. However, this welding method involves clamping and positioning the parts multiple times during the welding process, which causes the errors generated in each positioning process to accumulate together, resulting in a large error in the final welded forklift tailstock and a low yield rate.

[0003] Chinese patent CN218836595U discloses a forklift tailstock welding fixture, belonging to the field of forklift tailstock welding technology. It includes a positioning component for defining the position of a workpiece. The positioning component includes a base plate, two support plates, a telescopic clamping mechanism that extends and retracts vertically, and a counterweight positioning component. The base plate is provided with two first positioning blocks and a rear axle positioning block. The two ends of the workpiece's upper curved plate are respectively positioned on the top of the two first positioning blocks. The number of rear axle positioning blocks is equal to the number of rear axle mounting plates on the workpiece. In this invention, the base plate, support plates, telescopic clamping mechanism, and counterweight positioning component simultaneously position the various components of the workpiece. The various components are first assembled and positioned to form the basic shape of the workpiece, and then the various components are welded and fixed together. That is, the workpiece only needs to be positioned once before it becomes a finished product. However, in this scheme, the bent plate is only limited in the horizontal left and right directions and the vertical direction by the first positioning block. The bent plate is not clamped and positioned from back to front, so the reinforcing rib and the bent base plate are not clamped and positioned from back to front. The bent base plate is only horizontally limited by static friction generated by the telescopic clamping mechanism. However, this horizontal limiting method is prone to insufficient clamping force, resulting in insufficient friction, or the lateral impact on the bent base plate is greater than the static friction, which causes the position of the bent plate or the bent base plate to shift during spot welding. This causes relative shift between the various structures of the workpiece, resulting in the welded workpiece structure not meeting the requirements. Utility Model Content

[0004] This utility model addresses the problem of structural deviations occurring during the welding process of forklift tailstocks due to the front-to-back freedom of the support block. It provides a welding fixture for assembling forklift tailstocks, with the specific technical solution as follows: A welding fixture for a forklift tail carriage is provided. The welding fixture is used to define the forklift tail carriage for welding in the front-back and left-right directions. The bent plate of the forklift tail carriage is located in the rear direction of the welding fixture. The welding fixture includes: a bottom positioning component, which includes a central support base for forming a positioning reference for the forklift tail carriage; a forward positioning component located in front of the central support base, which can clamp and position the forklift tail carriage in the forward direction with the central support base; and a rearward positioning component located behind the central support base, which includes a V-shaped centering plate that matches the bent plate, which can clamp and position the forklift tail carriage in the rear direction with the central support base.

[0005] Furthermore, the rearward positioning assembly also includes a second positioning screw that pushes the V-shaped centering plate to move; the V-shaped centering plate forms a pair of symmetrical sides with the same bending angle as the bent plate, and the V-shaped centering plate is symmetrical about the second positioning screw.

[0006] Furthermore, the rear positioning assembly also includes: a vertical support rod for supporting the bent plate, the vertical support rod being perpendicular to the bent plate; a rear support base for mounting a second positioning screw, the second positioning screw rotating relative to the rear support base to push the V-shaped centering plate to move relative to the rear support base; and an H-shaped limiting plate rotatably connected to the upper part of the V-shaped centering plate, the H-shaped limiting plate having the same line of symmetry as the V-shaped centering plate, the open end of the H-shaped limiting plate being able to fix the rear stiffener of the forklift tailstock.

[0007] Preferably, the bottom positioning assembly further includes: a limiting pin disposed on the top of the central support base, the limiting pin engaging with the bottom of the counterweight connecting seat of the forklift tail carriage; an elastic support member disposed in the front-rear direction of the central support base, the top of the elastic support member forming a groove matching the side of the support plate of the forklift tail carriage, the groove being able to drive the support plate to move relative to the counterweight connecting seat; and a centering clamping member disposed on the top of the central support base, the centering clamping member clamping the support center plate of the forklift tail carriage in the left-right direction via a bidirectional screw.

[0008] Preferably, the elastic support includes a retaining plate with a groove formed on its top, which moves up and down relative to the guide base via a compression spring.

[0009] Preferably, the bottom positioning assembly further includes a telescopic clamping member disposed on the top of the central support base. The clamping end of the telescopic clamping member moves perpendicular to the central support base, and the clamping end of the telescopic clamping member can pass through the central support plate and clamp the central support plate.

[0010] Preferably, the forward positioning component includes a forward support base, a first positioning screw is provided in the middle of the forward support base, one end of the first positioning screw moves relative to the central support base through a thread, and a linkage mechanism is provided at the top of the forward support base to move relative to the central support base. The linkage mechanism forms a limiting pin to position the counterweight fixing block of the forklift tail carriage.

[0011] Preferably, the forward positioning assembly further includes a guide seat disposed on the top of the forward support base. The guide seat guides the guide shaft to move forward relative to the central support base. A forward positioning plate is disposed at one end of the guide shaft near the central support base. The forward positioning plate is fixed to the counterweight fixing block by a limiting pin. The other end of the guide shaft is connected in sequence to a connecting rod, a push-pull handle, and a movable base. The guide shaft, connecting rod, push-pull handle, and movable base that move relative to the guide seat form a linkage mechanism. The movable base is the frame of the linkage mechanism. One end of the guide shaft and the movable base form a sliding pair. Both ends of the connecting rod and both ends of the push-pull handle are rotating pairs. When the push-pull handle rotates relative to the movable base, the connecting rod drives the guide shaft to move relative to the movable base and the guide seat.

[0012] Preferably, it further includes left and right positioning components respectively disposed in the left and right directions of the bottom positioning component. The left and right positioning components include left and right support bases for fixing the limiting base plate and the left and right limiting side plates. The limiting base plate is used to limit the height of the limiting rib plate of the forklift tail frame relative to the central support base, and the left and right limiting side plates are used to limit the left and right positions of the limiting rib plate relative to the central support base.

[0013] As can be seen from the above technical solution, this utility model has the following beneficial effects: This invention establishes a positioning reference for the forklift tailstock using a bottom positioning component, restricts the forward movement of the forklift tailstock using a forward positioning component, and restricts the backward movement of the bent tail plate using a V-shaped centering plate of a rear positioning component, thus achieving zero horizontal degree of freedom for the forklift tailstock. This ensures the positional relationship between the components during the welding process of the forklift tailstock and guarantees the structural accuracy of the welded forklift tailstock. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the forklift tailstock of this utility model; Figure 2 for Figure 1 Another structural diagram; Figure 3 This is a schematic diagram of the structure of the forklift tailstock fixed to an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 5 This is a structural schematic diagram of an embodiment of the bottom positioning component; Figure 6 This is a structural schematic diagram of an embodiment of the backward positioning component; Figure 7 This is a schematic diagram of the structure of an embodiment of the forward positioning component; Figure 8 for Figure 7 Enlarged view of the structure at point B in the image; Figure 9 for Figure 4 Enlarged view of the structure at point A in the image.

[0015] In the diagram: 1. Bottom positioning assembly; 11. Central support base; 12. Centering clamping component; 13. Telescopic clamping component; 14. Elastic support component; 141. Groove; 142. Clamping plate; 143. Compression spring; 144. Guide base; 2. Rear positioning assembly; 21. Vertical support rod; 22. Rear support base; 23. Second positioning screw; 24. V-shaped centering plate; 25. H-shaped limiting plate; 3. Forward positioning assembly; 31. Forward support base; 32. First positioning screw; 33. Forward positioning plate; 34. 35. Guide seat; 36. Guide shaft; 37. Push-pull handle; 38. Moving base; 4. Connecting rod; 5. Left and right positioning components; 69. Left and right support base; 40. Limiting base plate; 61. Left and right limiting side plates; 62. Limiting pin; 63. Forklift tail frame; 604. Support center plate; 605. First fixing plate; 606. Second fixing plate; 607. Limiting rib plate; 608. Counterweight fixing block; 609. Support upright plate; 600. Bend plate; 600. Tail rib plate; 610. Limiting hole; 62. Counterweight connecting seat. Detailed Implementation

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

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

[0018] like Figure 3 and Figure 4As shown, this embodiment is a welding fixture for a forklift tail carriage. The welding fixture is used to limit the welding of the forklift tail carriage 6 in the front-back and left-right directions. The bent plate 607 of the forklift tail carriage 6 is set in the rear direction of the welding fixture. The welding fixture is characterized by including: a bottom positioning component 1, which includes a central support base 11 for forming a positioning reference for the forklift tail carriage 6; a forward positioning component 3 set in front of the central support base 11, which can clamp and position the forklift tail carriage 6 in the front direction; and a rearward positioning component 2 set in the rear direction of the central support base 11, which includes a V-shaped centering plate 24 that matches the bent plate 607, which can clamp and position the forklift tail carriage 6 in the rear direction.

[0019] Specifically, in the diagram, the X-axis represents the front-to-back direction, with the positive X-axis pointing forward; the Y-axis represents the left-to-right direction, with the positive Y-axis pointing to the right; and the Z-axis represents the up-to-down direction, with the positive Z-axis pointing upward.

[0020] Secondly, the bottom of the central support base 11 is mounted on a horizontal plate, and a limiting pin 5 is formed at its top to cooperate with the bottom through hole of the counterweight connecting seat 610, so that it can limit the horizontal position of the forklift tail carriage 6. Thus, the central support base 11 limits the relative position of the forklift tail carriage 6 through the limiting function of the limiting pin 5. Secondly, the forward positioning component 3 moves closer to or further away from the forward direction of the forklift tail carriage 6 through a movable mechanism. When it moves closer to or even applies pressure to the forward direction of the forklift tail carriage 6, the forward positioning component 3 can fix the forward position of the forklift tail carriage 6 relative to the central support base 11, so that the forklift tail carriage 6 will not shift forward during the welding process. The rearward positioning component 2 moves closer to or further away from the rear of the forklift tail carriage 6 via a movable V-shaped centering plate 24. When the V-shaped centering plate 24 moves closer to the rear of the forklift tail carriage 6, that is, closer to the bent plate 607, the bending angles of the V-shaped centering plate 24 and the bent plate 607 are the same, and the two match each other, so that the V-shaped centering plate 24 can fix the position of the bent plate 607, thereby fixing the position of the rearward of the forklift tail carriage 6 relative to the central support base 11. This prevents the forklift tail carriage 6 from shifting backward during the welding process, and prevents it from shifting forward or backward during the welding process, thereby improving the structural accuracy of the forklift tail carriage 6 after welding.

[0021] like Figure 5 As shown, the rear positioning assembly 2 also includes a second positioning screw 23 that pushes the V-shaped centering plate 24 to move; the V-shaped centering plate 24 forms a pair of symmetrical sides with the same bending angle as the bent plate 607, and the V-shaped centering plate 24 is symmetrical about the second positioning screw 23.

[0022] Specifically, the axis of the second positioning screw 23 is horizontal and parallel to the X-axis. One end of the screw is connected to a connecting rod with an extended lever arm. The middle position of the screw is determined by a threaded pair to define the Z-axis position. The other end of the screw is rotatably connected to the V-shaped centering plate 24 through a bearing, so that the rotation of the second positioning screw 23 can push the V-shaped centering plate 24 to move along the X-axis. Secondly, the V-shaped centering plate 24 is symmetrical about the axis of the second positioning screw 23. Its left and right sides form an included angle α, and the two sides of the bent plate 607 facing the negative X-axis form an included angle β, where α = β. This allows the V-shaped centering plate 24 to approach and cooperate with the bent plate 607, preventing the bent plate 607 from moving backward. The second positioning screw 23 then pushes the bent plate 607 closer to and fixes it to the support center plate 601. The left and right sides of the V-shaped centering plate 24 align their own lines of symmetry with the lines of symmetry of the bent plate 607 through centering and positioning, thereby applying left and right positioning to the bent plate 607 and determining the horizontal position of the bent plate 607 relative to the V-shaped centering plate 24.

[0023] Furthermore, the rear positioning assembly 2 also includes: a vertical support rod 21 for supporting the bent plate 607, the vertical support rod 21 being perpendicular to the bent plate 607; a rear support base 22 for mounting the second positioning screw 23, the second positioning screw 23 rotating relative to the rear support base 22 to push the V-shaped centering plate 24 to move relative to the rear support base 22; and an H-shaped limiting plate 25 rotatably connected to the upper part of the V-shaped centering plate 24, the H-shaped limiting plate 25 having the same line of symmetry as the V-shaped centering plate 24, the open end of the H-shaped limiting plate 25 being able to fix the rear stiffener 608 of the forklift tail carriage 6.

[0024] Specifically, the rearward positioning assembly 2 includes three vertical support rods 21. The height direction of the vertical support rods 21 is consistent with the Z-axis direction, and their tops are used to support the bent plate 607. They are respectively set at the left and right ends of the bent plate 607 and at the middle position near the support center plate 601, forming three support points for supporting the bent plate 607, thereby forming a support plane and improving the support effect of the bent plate 607. Secondly, the top of the rearward support base 22 is threadedly connected to the second positioning screw 23, so that the second positioning screw 23 rotates and moves relative to the rearward support base 22 along the thread. The tops of the left and right ends of the rearward support base 22 are respectively fixedly connected to slide rails, which are slidably connected to the bottom ends of the V-shaped centering plate 24 through sliders. The second positioning screw 23 can push the V-shaped centering plate 24 to move along the slide rail, ensuring the straightness of the movement trajectory of the V-shaped centering plate 24, thereby ensuring its positioning effect on the bent plate 607; secondly, the H-shaped limiting plate 25 is H-shaped with open ends at both the front and rear. Its rearward open end is rotatably connected to the middle position of the V-shaped centering plate 24, and its forward open end is aligned with and fixes the tail rib 608. The symmetrical planes of the H-shaped limiting plate 25, the V-shaped centering plate 24, the bent plate 607 and the tail rib 608 all coincide, so that during the process of the V-shaped centering plate 24 pressing the bent plate 607, the open end of the H-shaped limiting plate 25 limits the tail rib 608 to the left and right and to the up and down, so that the position of the tail rib 608 relative to the bent plate 607 is fixed.

[0025] like Figure 6 As shown, the bottom positioning assembly 1 also includes: a limiting pin 5 disposed on the top of the central support base 11, the limiting pin 5 engaging with the bottom of the counterweight connecting seat 610 of the forklift tail carriage 6; an elastic support member 14 disposed in the front-rear direction of the central support base 11, the top of the elastic support member 14 forming a groove 141 matching the side of the support plate 606 of the forklift tail carriage 6, the groove 141 being able to drive the support plate 606 to move relative to the counterweight connecting seat 610; and a centering clamping member 12 disposed on the top of the central support base 11, the centering clamping member 12 clamping the support center plate 601 of the forklift tail carriage 6 in the left-right direction via a bidirectional screw.

[0026] Specifically, the counterweight connecting seat 610 is a type of support with a through hole at its bottom that engages with the limiting pin 5. The limiting pin 5 forms the front and rear positions of the top of the central support base 11 and engages with the counterweight connecting seat 610 at the front and rear positions of the forklift tail carriage 6, thus forming four limiting pins 5 engaging with four through holes, thereby limiting the horizontal movement of the counterweight connecting seat 610 and forming the positioning reference of the forklift tail carriage 6. Secondly, the bottom of the support plate 606 at the front and rear positions engages with the top groove 141 of the elastic support member 14, restricting its left and right position. At the same time, the support... The upright plate 606 can push the elastic support member 14 downward to compress and deform until it is compressed to its minimum position. At this time, the positional relationship between the support upright plate 606 and the counterweight connecting seat 610 is determined. Secondly, the centering clamping member 12 forms a rotating pair with the fixed block connected to the top of the central support base 11 through the bidirectional screw, so that the bidirectional screw rotates only relative to the fixed block. When it rotates, the clamping members at both ends of the bidirectional screw move towards the middle, thereby clamping the left and right sides of the support center plate 601 to the middle position of the bidirectional screw, thereby realizing the centering and positioning of the support center plate 601.

[0027] Furthermore, the elastic support 14 includes a retaining plate 142 with a groove 141 formed on its top, and the retaining plate 142 moves up and down relative to the guide base 144 by a compression spring 143.

[0028] Specifically, elastic support members 14 are placed at the front and rear ends of the central support base 11 to support and fix the position of the support plate 606 at the front and rear positions. Compression springs 143 and guide members are respectively provided at the left and right ends of the guide base 144. The bottom of the compression spring 143 is connected to the guide base 144, and the top of the spring 143 is connected to a retaining plate 142. The top of the retaining plate 142 forms a groove 141 that matches the bottom of the support plate 606. The retaining plate 142 can move closer to the guide base 144 along the axis of the compression spring 143, thereby driving the support plate 606 to move towards the guide base 144 until the distance between the retaining plate 142 and the guide base 144 is minimized, and the position of the support plate 606 and the counterweight connecting seat 610 along the Z-axis is determined.

[0029] Furthermore, the bottom positioning component 1 also includes a telescopic clamping member 13 disposed on the top of the central support base 11. The clamping end of the telescopic clamping member 13 moves perpendicular to the central support base 11, and the clamping end of the telescopic clamping member 13 can pass through the support center plate 601 and clamp the support center plate 601.

[0030] Specifically, the axis of the telescopic clamping member 13 is parallel to the Z-axis, its bottom is fixed relative to the central support base 11, and its top is the telescopic end, which passes through the support center plate 601 through the limiting hole 609; secondly, the telescopic clamping member 13 drives the pressure block through the cylinder to press the support center block against the central support base 11, so that the position of the support center block and the central support base 11 is relatively fixed.

[0031] like Figure 7 As shown, the forward positioning assembly 3 includes a forward support base 31. A first positioning screw 32 is provided in the middle of the forward support base 31. One end of the first positioning screw 32 moves relative to the central support base 11 through a thread. A linkage mechanism is provided at the top of the forward support base 31 and moves relative to the central support base 11. The linkage mechanism forms a limit pin 5 to position the counterweight fixing block 605 of the forklift tail frame 6.

[0032] Specifically, the height direction of the forward support base 31 is the Z-axis direction, and a first positioning screw 32 passes through its middle position. The first positioning screw 32 is connected to it by threads and its axis is parallel to the X-axis. One end of the first positioning screw 32 is provided with a connecting rod with an extended lever arm. The first positioning screw 32 rotates relative to the forward support base 31, and its other end moves relative to the support plate 606 along the X-axis, thereby pressing the support plate 606 against the central support base 11 and fixing it. Next, the linkage mechanism rotates relative to the top of the forward support base 31 along the XZ plane, and its movable end moves relative to the counterweight fixing block 605 along the X-axis. Its movable end forms a limiting pin 5 for fixing the counterweight fixing block 605. The counterweight fixing block 605 forms a through limiting hole 609 along the Y-axis direction. The limiting hole 609 cooperates with the limiting pin 5 of the linkage mechanism, so that the relative position of the counterweight fixing block 605 and the movable end of the linkage mechanism is determined, thereby facilitating welding positioning.

[0033] like Figure 8 As shown, the forward positioning assembly 3 also includes a guide seat 34 disposed on the top of the forward support base 31. The guide seat 34 guides the guide shaft 35 to move forward relative to the central support base 11. A forward positioning plate 33 is disposed at one end of the guide shaft 35 near the central support base 11. The forward positioning plate 33 is fixed to the counterweight fixing block 605 by a limit pin 5. The other end of the guide shaft 35 is connected in sequence to the connecting rod 38, the push-pull handle 36 and the movable base 37. The guide shaft 35, the connecting rod 38, the push-pull handle 36 and the movable base 37 moving relative to the guide seat 34 form a linkage mechanism. The movable base 37 is the frame of the linkage mechanism. The guide shaft 35 and one end of the movable base 37 form a sliding pair. Both ends of the connecting rod 38 and both ends of the push-pull handle 36 are rotating pairs. When the push-pull handle 36 rotates relative to the movable base 37, the connecting rod 38 drives the guide shaft 35 to move relative to the movable base 37 and the guide seat 34.

[0034] Specifically, the top of the forward support base 31 is fixed to the guide seat 34 by bolts or welding. The interior of the guide seat 34 is slidably connected to three guide shafts 35, and the axes of the guide shafts 35 are all parallel to the X-axis. A forward positioning plate 33 is installed at one end of the guide shaft 35 near the central support base 11. It is perpendicular to the guide shaft 35, and the guide shaft 35 is connected to the middle and the left and right sides respectively. The guide shaft 35 is movably connected to the middle of the forward positioning plate 33 by bolts and nuts, so that the position of the guide shaft 35 in the middle position relative to the guide seat 34 during the assembly process can adjust the distance between the forward positioning plate 33 and the guide seat 34, thereby fine-tuning the positional relationship between the limiting pin 5 formed on the forward positioning plate 33 and the limiting hole 609 of the counterweight fixing block 605, and adjusting the positional relationship between the end face of the forward positioning plate 33 and the end face of the counterweight fixing block 605, i.e., parallel or coincident.

[0035] Secondly, the top of the forward support base 31 is fixedly connected to the movable base 37 by bolts. The front end of the movable base 37 is rotatably connected to the push-pull handle 36, and its rear end is slidably connected to the guide shaft 35 in the middle position. At the same time, the guide shaft 35 in the middle position is rotatably connected to one end of the connecting rod 38, and the other end of the connecting rod 38 is rotatably connected to the push-pull handle 36, so that the movable base 37 is the frame of the linkage mechanism. When the push-pull handle rotates relative to the movable base 37, it can drive the connecting rod 38 to swing, and then the connecting rod 38 swings relative to the guide shaft 35 in the middle position. The guide shaft 35 in the middle position slides relative to one end of the movable base 37, thereby driving the forward positioning plate 33 to move relative to the counterweight fixing block 605. This allows the operating push plate handle to push the limiting pin 5 of the forward positioning plate 33 to engage with the limiting hole 609 of the counterweight fixing block 605, and the end face of the forward positioning plate 33 to coincide with the end face of the counterweight fixing block 605 for alignment and positioning, thereby improving the positioning accuracy of the counterweight positioning block.

[0036] like Figure 9 As shown, it also includes left and right positioning components 4 respectively disposed in the left and right directions of the bottom positioning component 1. The left and right positioning components 4 include left and right support bases 41 for fixing the limiting base plate 42 and the left and right limiting side plates 43. The limiting base plate 42 is used to limit the height of the limiting rib plate 604 of the forklift tail frame 6 relative to the central support base 11, and the left and right limiting side plates 43 are used to limit the left and right positions of the limiting rib plate 604 relative to the central support base 11.

[0037] Specifically, the left and right support bases 41 are symmetrically arranged at the left and right ends of the bottom positioning component 1. They are fixed to the position of the limiting base plate 42 and the left and right limiting side plates 43 relative to themselves by welding. The limiting base plate 42 is used to support the limiting rib plate 604, thereby restricting its downward movement along the Z-axis, thus determining the height position of the limiting rib plate 604, and thus determining the bending angle between the first fixing plate 602, the supporting center plate 601 and the second fixing plate 603. Secondly, the left and right limiting side plates 43 contact the left and right sides of the limiting rib plate 604, thereby restricting its movement in the left and right directions. Together with the limiting base plate 42, they determine the positional relationship between the limiting rib plate 604 and the supporting center plate 601.

[0038] The usage method of this embodiment is as follows: First, the counterweight connecting seat 610 is positioned and installed with the limiting pin 5 at the top of the central support base 11 through the bottom hole. Then, the forward support plate 606 is placed into the forward groove 141 and pushed downward until the groove 141 cannot move. The first positioning screw 32 presses the forward support plate 606 against the forward counterweight connecting seat 610 and fixes it with spot welding. Then, the rear support plate 606 is placed into the rear groove 141 and pushed downward until the groove 141 cannot move. The tail plate is placed on the vertical support rod 21. The second positioning screw 23 pushes the V-shaped centering plate 24 to press the tail plate against the rear support plate 606 and press it against the rear counterweight connecting seat 610 and fix it with spot welding. Then, the tail rib plate 608 is positioned between the V-shaped centering plate 24 and the support plate 606 through the H-shaped limiting plate 25 and fixed with spot welding. The support center plate 601, the first fixing plate 602, and the second fixing plate 603 are integrally formed. The support center plate 601 is then placed on top of the counterweight connecting seat 610. The centering clamping member 12 clamps and centers the support center plate 601 relative to the counterweight connecting seat 610. The telescopic pressing member 13 positions the support center plate 601 horizontally through the middle through hole. The limiting rib plate 604 is positioned by the limiting bottom plate 42 and the left and right limiting side plates 43, thereby determining its position relative to the support center plate 601. It is then spot-welded and fixed. The counterweight fixing block 605 is positioned by the limiting hole 609 and the limiting pin 5 of the forward positioning plate 33. The forward positioning plate 33 moves the counterweight fixing block 605 to the front end of the support center plate 601 through the linkage mechanism and spot-welds and fixes it. After the entire forklift tail frame 6 is pressed and positioned, the overall welding can begin.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

[0040] The technologies, shapes, and structures not described in detail in this utility model are all known technologies.

Claims

1. A welding fixture for a forklift tailstock, the welding fixture being used to limit the forklift tailstock (6) for welding in the front-rear and left-right directions, wherein the bent plate (607) of the forklift tailstock (6) is disposed in the rear direction of the welding fixture, characterized in that, The welding fixture includes: Bottom positioning assembly (1), the bottom positioning assembly (1) includes a central support base (11) for forming a positioning reference for the forklift tail carriage (6); A forward positioning component (3) is disposed on the central support base (11), the forward positioning component (3) and the central support base (11) being capable of clamping and positioning the forklift tail carriage (6) forward; and A rearward positioning component (2) is disposed on the rear of the central support base (11). The rearward positioning component (2) includes a V-shaped centering plate (24) that matches the bent plate (607). The V-shaped centering plate (24) and the central support base (11) are capable of clamping and positioning the forklift tail carriage (6) in the rear.

2. The welding fixture according to claim 1, characterized in that: The rear positioning assembly (2) also includes a second positioning screw (23) that pushes the V-shaped centering plate (24) to move; The V-shaped centering plate (24) forms a pair of symmetrical sides with the same bending angle as the bending plate (607), and the V-shaped centering plate (24) is symmetrical about the second positioning screw (23).

3. The welding fixture according to claim 2, characterized in that: The backward positioning component (2) further includes: A vertical support rod (21) is used to support the bent plate (607), and the vertical support rod (21) is perpendicular to the bent plate (607); A rearward support base (22) for mounting the second positioning screw (23), the second positioning screw (23) rotating relative to the rearward support base (22) to push the V-shaped centering plate (24) to move relative to the rearward support base (22); and An H-shaped limiting plate (25) is rotatably connected to the upper part of the V-shaped centering plate (24). The H-shaped limiting plate (25) has the same line of symmetry as the V-shaped centering plate (24). The open end of the H-shaped limiting plate (25) can fix the tail rib (608) of the forklift tail frame (6).

4. The welding fixture according to claim 1, characterized in that: The bottom positioning component (1) also includes: A limiting pin (5) is provided at the top of the central support base (11), and the limiting pin (5) engages with the bottom of the counterweight connecting seat (610) of the forklift tail carriage (6). An elastic support member (14) is provided in the front-rear direction of the central support base (11). The top of the elastic support member (14) forms a groove (141) that matches the side of the support plate (606) of the forklift tail frame (6). The groove (141) can drive the support plate (606) to move relative to the counterweight connecting seat (610). The centering clamping member (12) is set on the top of the central support base (11), and the centering clamping member (12) clamps the support center plate (601) of the forklift tail frame (6) in the left and right directions by means of a two-way screw.

5. The welding fixture according to claim 4, characterized in that: The elastic support (14) includes a retaining plate (142) with the groove (141) formed on its top, and the retaining plate (142) moves up and down relative to the guide base (144) by a compression spring (143).

6. The welding fixture according to claim 4, characterized in that: The bottom positioning component (1) further includes a telescopic clamping member (13) disposed on the top of the central support base (11). The clamping end of the telescopic clamping member (13) moves perpendicular to the central support base (11). The clamping end of the telescopic clamping member (13) can pass through the support center plate (601) and clamp the support center plate (601).

7. The welding fixture according to claim 1, characterized in that: The forward positioning assembly (3) includes a forward support base (31), a first positioning screw (32) is provided in the middle of the forward support base (31), one end of the first positioning screw (32) moves relative to the central support base (11) by means of a thread, and a linkage mechanism is provided at the top of the forward support base (31) to move relative to the central support base (11), and the linkage mechanism forms a limiting pin (5) to position the counterweight fixing block (605) of the forklift tail frame (6).

8. The welding fixture according to claim 7, characterized in that: The forward positioning component (3) further includes a guide seat (34) disposed on the top of the forward support base (31). The guide seat (34) guides the guide shaft (35) to move forward relative to the central support base (11). A forward positioning plate (33) is disposed at one end of the guide shaft (35) near the central support base (11). The forward positioning plate (33) fixes the counterweight fixing block (605) by the limiting pin (5). The other end of the guide shaft (35) is connected in sequence to the connecting rod (38), the push-pull handle (36), and the movable base (37). The guide shaft (35), the connecting rod (38), the push-pull handle (36), and the movable base (37), which move relative to the guide seat (34), form the linkage mechanism. The movable base (37) is the frame of the linkage mechanism. The guide shaft (35) and one end of the movable base (37) form a sliding pair. Both ends of the connecting rod (38) and both ends of the push-pull handle (36) are rotating pairs. When the push-pull handle (36) rotates relative to the movable base (37), the connecting rod (38) drives the guide shaft (35) to move relative to the movable base (37) and the guide seat (34).

9. The welding fixture according to claim 1, characterized in that, It also includes left and right positioning components (4) respectively disposed in the left and right directions of the bottom positioning component (1). The left and right positioning components (4) include left and right support bases (41) for fixing the limiting base plate (42) and the left and right limiting side plates (43). The limiting base plate (42) is used to limit the height of the limiting rib plate (604) of the forklift tail frame (6) relative to the central support base (11). The left and right limiting side plates (43) are used to limit the left and right positions of the limiting rib plate (604) relative to the central support base (11).

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