Passenger car seat framework welding tool

Abstract

The utility model discloses a passenger car seat framework welding tool, which relates to the technical field of passenger car seat processing, and comprises a positioning plate, a positioning mechanism and a clamping mechanism, the positioning mechanism comprises a longitudinal beam positioning shaft, a longitudinal beam positioning block, a plurality of plane positioning blocks and a plurality of vertical surface positioning blocks, positioning pin shafts are arranged on the plane positioning block and the vertical surface positioning block and are used for positioning a workpiece to be welded; the clamping mechanism comprises a horizontal clamping cylinder and a rotary pressing clamping cylinder which are used for clamping and fixing; the jacking air cylinder is used for jacking the welded workpiece upwards by a set height, so that the seat framework is convenient to disassemble; front and rear longitudinal beams, left and right angle steel, a plurality of flat plates and angle steel of a seat framework are positioned through cooperation of the positioning shaft and the positioning blocks, positioning accuracy is improved, meanwhile, the multiple clamping air cylinders are pneumatically and synchronously pressed, welding seam deviation and welding deformation generated when a seat underframe is welded are reduced, welding accuracy is improved, and welding efficiency is improved. The product quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bus passenger seat processing, in particular to a bus seat frame welding tool. Background Art

[0002] As a core component of a seat, the seat frame structurally determines its support and safety, making its welding accuracy crucial. Robotic welding ensures excellent weld accuracy and strength, significantly improving weld quality, efficiency, and labor intensity. Its application in bus seat welding production is growing. However, existing frame welding tooling suffers from poor positioning accuracy and inconsistent clamping. This can easily lead to deviations in the weld seam of the welding robot during welding, resulting in poor weld quality. Furthermore, the frame can be disassembled slowly after welding, impacting production efficiency. Utility Model Content

[0003] In response to the deficiencies in the above-mentioned prior art, the utility model provides a passenger car seat frame welding tool that can accurately position and synchronously clamp the frame to be welded, reduce or eliminate welding deformation caused by the seat frame during welding, improve welding accuracy, and enhance product quality.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A passenger car seat frame welding tool comprises a positioning plate and a positioning mechanism and a clamping mechanism fixedly mounted on the positioning plate. The positioning mechanism comprises a longitudinal beam positioning shaft, a longitudinal beam positioning block, and a plurality of plane positioning blocks and vertical positioning blocks. The plane positioning blocks and vertical positioning blocks are provided with positioning pins for positioning the workpiece to be welded. The clamping mechanism comprises a horizontal clamping cylinder and a rotary downward clamping cylinder. The horizontal clamping cylinder cooperates with the vertical positioning block to clamp the workpiece, and the rotary downward clamping cylinder cooperates with the longitudinal beam positioning block and the plane positioning block to clamp the workpiece.

[0006] It also includes a lifting cylinder, which is used to push the welded workpiece upward to a set height to facilitate the disassembly of the seat frame.

[0007] As a further implementation, the longitudinal beam positioning block includes two positioning blocks 1 arranged at both ends of the positioning plate, and both ends of each positioning block 1 are respectively processed with positioning grooves for accommodating the front and rear longitudinal beams.

[0008] As a further implementation method, the positioning shaft is fixedly installed on the outside of the positioning block 1, and the front and rear longitudinal beams are provided with an axial hole for the longitudinal beam positioning shaft to pass through. The longitudinal beam positioning shaft cooperates with the longitudinal beam positioning block to position the front and rear longitudinal beams to ensure the accuracy and stability of the positioning of the front and rear longitudinal beams.

[0009] As a further implementation method, the vertical positioning block includes a fixed positioning block and a movable positioning block. The fixed positioning block is in contact with one side of the workpiece, and the movable positioning block is provided with a guide rod. The guide rod cooperates with the horizontal clamping cylinder to move the movable positioning block to clamp the workpiece.

[0010] As a further implementation, the horizontal clamping cylinder is installed on a side of the movable positioning block away from the fixed positioning block, and is used to push the movable positioning block to clamp the workpiece.

[0011] As a further implementation method, the lifting cylinders are arranged under the front and rear longitudinal beams, including lifting cylinder 1 and lifting cylinder 2 arranged diagonally, which can stably lift the welded workpiece to a certain height to facilitate the disassembly of materials.

[0012] As a further implementation method, the horizontal clamping cylinder and the rotary downward clamping cylinder are connected in series to form a first air circuit, which can act synchronously, thereby reducing the displacement of parts during re-clamping, avoiding weld offset, and improving welding quality; the lifting cylinder one and the lifting cylinder two are connected in series to form a second air circuit, and the first air circuit and the second air circuit are arranged in parallel.

[0013] As a further implementation, the air inlet ends of the first air path and the second air path are connected to the air pressure source via a pressure reducing valve, and the pressure reducing valve is used to stabilize the output pressure of the cylinder and is not affected by changes in upstream pressure.

[0014] As a further implementation method, a first reversing valve is provided on the first gas circuit, and a second reversing valve is provided on the second gas circuit, so as to control the working states of the two gas circuits respectively, accurately and efficiently.

[0015] As a further implementation, the horizontal clamping cylinder and the lifting cylinder are both thin cylinders, and the rotary downward clamping cylinder is an angle cylinder.

[0016] As a further implementation method, the positioning plate is provided with a plurality of hollows to reserve space for the welding gun and the welding manipulator to move, and at the same time can reduce weight.

[0017] By adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0018] 1. The utility model can position the front and rear longitudinal beams, left and right angle steels, and several flat plates and angle steels of the seat frame respectively through the cooperation of the positioning shaft and several positioning blocks to ensure the accuracy of positioning. At the same time, the horizontal clamping cylinder, the rotary downward clamping cylinder and the lifting cylinder are used in conjunction with each positioning block to perform pneumatic synchronous clamping, and can effectively reduce or even eliminate the weld offset and welding deformation caused by the seat frame during welding, thereby improving welding accuracy and product quality, and has high operating efficiency and convenient control.

[0019] 2. The utility model realizes the synchronous action of all the horizontal clamping cylinders and the rotary downward clamping cylinders through the linkage control of the reversing valve one, and controls the lifting cylinder through the reversing valve two to quickly lift up the seat frame after welding, thereby realizing the rapid disassembly of the frame on the tooling, overcoming the difficulty of the robot or manual labor in avoiding the tooling to remove the welded frame, greatly improving the production efficiency, and at the same time reducing the displacement of the parts during the clamping process, which is beneficial to reducing welding deformation and improving welding quality.

[0020] 3. In the present invention, the left angle steel and the second flat plate in the seat frame are positioned and clamped by cooperating with the horizontal clamping cylinder and the vertical positioning block, which ensures accurate positioning and convenient operation.

[0021] 4. In the present invention, the positioning shaft, positioning block and all cylinders are fixed to the positioning plate by bolt connection, which is convenient for assembly and disassembly and has low installation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0023] Figure 1 This is a schematic diagram of a seat frame workpiece in an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of the positioning mechanism arrangement of an embodiment of the utility model;

[0025] Figure 3 A top view of the clamping mechanism arrangement according to an embodiment of the present utility model;

[0026] Figure 4 A side view of the clamping mechanism arrangement of an embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the movable positioning block according to an embodiment of the present utility model;

[0028] Figure 6 Schematic diagram of the pneumatic circuit of an embodiment of the present utility model.

[0029] In the figure: 1. Positioning plate; 2. Positioning mechanism; 3. Clamping mechanism; 4. Lifting cylinder 1; 5. Lifting cylinder 2; 6. Pressure reducing valve; 7. Air pressure source; 8. Reversing valve 1; 9. Reversing valve 2;

[0030] 201, longitudinal beam positioning axis; 202, positioning block 1; 2021, positioning groove; 203, positioning block 2; 204, positioning block 3; 205, positioning block 4; 206, positioning block 5; 207, positioning block 6; 208, fixed positioning block 1; 209, movable positioning block 1; 210, fixed positioning block 2; 211, movable positioning block 2; 212, positioning pin shaft;

[0031] 301, rotary pressing cylinder 1; 302, rotary pressing cylinder 2; 303, rotary pressing cylinder; 304, rotary pressing cylinder 4; 305, rotary pressing cylinder 5; 306, rotary pressing cylinder 6; 307, rotary pressing cylinder 7; 308, rotary pressing cylinder 8; 309, rotary pressing cylinder 9; 310, clamping cylinder 1; 311, clamping cylinder 2;

[0032] 001, front longitudinal beam; 002, rear longitudinal beam; 003, left end angle steel; 004, right end angle steel; 005, first angle steel; 006, second angle steel; 007, third angle steel; 008, fourth angle steel; 009, first flat plate; 010, second flat plate; 011, third flat plate. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] In a typical embodiment of the present application, a bus seat frame welding tool is provided, such as Figure 1-6As shown, it includes a positioning plate 1 and a positioning mechanism 2 and a clamping mechanism 3 fixedly mounted on the positioning plate, the positioning mechanism 2 includes a longitudinal beam positioning shaft 201, a longitudinal beam positioning block and a plurality of plane positioning blocks and vertical positioning blocks, the plane positioning block and the vertical positioning block are provided with a positioning pin shaft 212 for positioning the workpiece to be welded; the clamping mechanism 3 includes a horizontal clamping cylinder and a rotary downward clamping cylinder for clamping and fixing parts; the horizontal clamping cylinder cooperates with the vertical positioning block to clamp the workpiece, and the rotary downward clamping cylinder cooperates with the longitudinal beam positioning block and the plane positioning block to clamp the workpiece; it also includes a lifting cylinder for pushing the workpiece after welding upward to a set height to facilitate the disassembly of the seat frame.

[0037] Specifically, the passenger car seat frame structure processed in this embodiment is as follows: Figure 1 As shown, it includes a front longitudinal beam 001, a rear longitudinal beam 002, a left end angle steel 003 and a right end angle steel 004, wherein the left end angle steel 003 and the right end angle steel 004 are welded between the front longitudinal beam 001 and the rear longitudinal beam 002, and are located at the left and right ends respectively. Three angle steels need to be welded on the front longitudinal beam 001, namely the first angle steel 005, the second angle steel 006 and the third angle steel 007. Two flat plates and one angle steel need to be welded on the rear longitudinal beam 002, namely the first flat plate 009, the third flat plate 011 and the fourth angle steel 008. A second flat plate 010 arranged vertically needs to be welded between the third angle steel 007 and the fourth angle steel 008.

[0038] In order to overcome the defects of weld deviation and welding quality caused by poor positioning accuracy of the seat frame and asynchronous clamping of multiple fixtures in welding production, in this embodiment, a positioning mechanism 2 and a clamping mechanism 3 are arranged on the positioning plate to improve the welding quality and production efficiency of this type of passenger car seat frame.

[0039] Specifically, if Figure 1 As shown, positioning blocks 202 are installed at both ends of the positioning plate 1. The two positioning blocks 202 are arranged in parallel. Each positioning block 202 is concave in shape, with a hollow center to avoid the robot and welding gun. Square positioning grooves 2021 are machined at both ends of the positioning block 202 to accommodate the front longitudinal beam 001 and the rear longitudinal beam 002. The two positioning blocks are used to roughly position the front and rear longitudinal beams. Figure 1As shown, two longitudinal beam positioning shafts 201 are mounted on the outer side of the left-side positioning block 1. The longitudinal beam positioning shafts 201 are vertically mounted on the positioning plate 1. Both the front and rear longitudinal beams are machined with axial holes for the longitudinal beam positioning shafts to pass through. The tops of the longitudinal beam positioning shafts pass through the axial holes, thereby achieving precise positioning of the front and rear longitudinal beams placed in the positioning grooves. In this embodiment, positioning block 1 is used to position the three surfaces of the front and rear longitudinal beams. The positioning shafts and axial holes are then combined to achieve three-surface, one-hole positioning. This restricts the five degrees of freedom of the front and rear longitudinal beams, effectively improving the accuracy and stability of the front and rear longitudinal beam positioning.

[0040] like Figure 1 As shown, a positioning block 203 is installed at the rightmost end of the positioning plate. The outer angle of the positioning block 203 is a right angle, which is used to fit with the two surfaces of the right-end angle steel 004 for surface positioning. At the same time, a positioning pin 212 is fixed on the upper end surface of the positioning block 203, which can pass through the process hole of the right-end angle steel to achieve precise positioning. Similarly, a positioning block 3 204 is provided at the front end of the positioning plate 1, which is located between the two positioning blocks 1 and is used to position the second angle steel 006. A positioning block 4 205 is fixed on the inner side of the positioning block 3 and is used to position the first angle steel 005. The rear side of the positioning plate is provided with a collinearly arranged positioning block 5 206 and a positioning block 6 207. The positioning block 5 206 and the positioning block 6 207 have the same shape and structure and are used to position the first flat plate 009 and the third flat plate 011, respectively. In this embodiment, positioning block two 203, positioning block three 204, positioning block four 205, positioning block five 206 and positioning block six 207 are collectively referred to as plane positioning blocks, the top of which is a plane and is used for surface positioning of some angle steels and flat plates.

[0041] Since the left end angle steel and the second flat plate are both involved in the upwardly extending facade, in this embodiment, a facade positioning block is provided to achieve accurate positioning and clamping of the two workpieces. Figure 5 As shown, each vertical positioning block includes a fixed positioning block and a movable positioning block, wherein the movable positioning block includes two square blocks, and the two square blocks are respectively provided with guide rods and guide holes to form a relative sliding connection. The guide rods are fixedly connected to the square blocks and can be connected to the horizontal clamping cylinder. The square blocks provided with the guide rods can move along the axial direction of the guide rods to approach the fixed positioning block, thereby limiting the workpiece between the two positioning blocks.

[0042] Specifically, fixed positioning block 1 208 and movable positioning block 1 209 are installed in conjunction with each other between two positioning blocks 1 202. Second plate 010 is installed between the sides of fixed positioning block 1 208 and movable positioning block 1 209 for positioning. At the same time, a positioning pin 212 is fixedly provided on the inner side of fixed positioning block 1 208, which is used to pass through the second plate for precise positioning. Similarly, fixed positioning block 210 and movable positioning block 211 are installed in conjunction with each other on the left side of positioning block 1 to position the left angle steel 003. The back of the left angle steel is in contact with fixed positioning block 2, and movable positioning block 2 is in contact with the other side of the left angle steel. The second clamping cylinder is extended to push movable positioning block 2 against fixed positioning block 2, thereby positioning and clamping the left angle steel.

[0043] As for the positioning of the third and fourth angle steels, after the front longitudinal beam is positioned, the third angle steel is placed on the inner side of the front longitudinal beam for positioning. Similarly, the fourth angle steel is placed on the inner side of the rear longitudinal beam for positioning.

[0044] Specifically, the clamping mechanism 3 includes a horizontal clamping cylinder and a rotary pressing clamping cylinder, wherein there are two horizontal clamping cylinders, namely, clamping cylinder 1 310 and clamping cylinder 2 311. Figure 3 As shown, clamping cylinder 1 310 is fixedly mounted on one side of and connected to movable positioning block 1 209. Clamping cylinder 1 310 drives movable positioning block 1 209 toward fixed positioning block 1 208, thereby clamping the second flat plate. Clamping cylinder 2 311 is fixedly mounted on the left end of movable positioning block 211. Clamping cylinder 2 311 drives movable positioning block 211 toward fixed positioning block 210, thereby clamping the left angle steel.

[0045] In this embodiment, nine rotary pressing clamping cylinders are provided for clamping the front and rear longitudinal beams and other angle steels and flat plates. Figure 3As shown, the rotary downward pressure cylinder 1 301 is fixedly installed on the outside of the positioning block 2 203 and is in the middle position. When the rotary downward pressure cylinder 1 301 is extended, the positioning block 2 can be pressed from top to bottom, thereby fixing the position of the positioning block 2 and ensuring smooth welding. Similarly, on the front side of the positioning plate 1, in order to complete the relative positioning and pressing of the front longitudinal beam and the first angle steel, the second angle steel and the third angle steel, a rotary downward pressing cylinder 2 302, a rotary downward pressing cylinder 3 303, a rotary downward pressing cylinder 4 304 and a rotary downward pressing cylinder 5 305 are sequentially arranged, wherein the rotary downward pressing cylinder 2 302, the rotary downward pressing cylinder 4 304 and the rotary downward pressing cylinder 5 305 are arranged in parallel, the rotary downward pressing cylinder 2 302 and the rotary downward pressing cylinder 5 305 are located at both ends and directly act on the front longitudinal beam to press down, the rotary downward pressing cylinder 4 304 is used to press the third angle steel 007, the rotary downward pressing cylinder 3 303 is adjacent to the rotary downward pressing cylinder 4 304 and is arranged relatively vertically to press and fix the second angle steel 006 connected to the outside of the front longitudinal beam. And, as Figure 3 As shown, a rotary downward pressure cylinder 6 306 is installed on the inner side between the rotary downward pressure cylinder 4 304 and the rotary downward pressure cylinder 5 305 for fixing the first angle steel 005 connected to the inner side of the front longitudinal beam on the seat frame.

[0046] Additionally, on the rear side of positioning plate 1, between the two positioning blocks 1, are mounted parallel to each other: rotary downward pressure cylinder 7 307, rotary downward pressure cylinder 8 308, and rotary downward pressure cylinder 9 309. Rotary downward pressure cylinder 7 307 and rotary downward pressure cylinder 9 309 are used to compress and secure the third flat plate 011 and first flat plate 009, respectively, to facilitate welding to the rear longitudinal beam. Rotary downward pressure cylinder 8 308, located between rotary downward pressure cylinder 7 307 and rotary downward pressure cylinder 9 309, is used to press and secure the fourth angle steel 008, thereby completing the seat frame to be welded. After each workpiece is positioned, it is compressed and secured to facilitate welding operations by the welding robot.

[0047] In order to achieve the synchronous clamping action of multiple fixtures in the entire tooling and avoid the problem of weld deviation, the horizontal clamping cylinders one and two and the rotary downward pressure cylinders one to nine in this application are connected in series on an air path and opened or closed at the same time to achieve synchronous clamping action, thereby reducing the displacement of parts during the re-clamping process, avoiding weld deviation, and improving welding quality.

[0048] In addition, in order to facilitate the removal of the seat frame from the welding tool after welding, a lifting cylinder 1 4 and a lifting cylinder 2 5 are also provided in this embodiment. Figure 3-4As shown, two lifting cylinders are arranged below the front and rear longitudinal beams. When the lifting cylinders are extended, they lift the front and rear longitudinal beams, thereby lifting the welded frame upward for a distance, making it easier for workers or robotic arms to remove the frame. This solves the problem of interference and collision with positioning and clamping tooling when removing the frame at the original workstation. Specifically, lifting cylinder 1 4 is installed below the front longitudinal beam 001, and lifting cylinder 2 5 is installed below the rear longitudinal beam 002. Lifting cylinder 1 4 and lifting cylinder 2 5 are arranged diagonally to ensure the stability of lifting the frame at two points. Of course, in other embodiments, a larger number of lifting cylinders can be selectively used to eject the frame. However, considering the limited space on the positioning plate and the purpose of simplifying the tooling, this embodiment preferably achieves this through two-point lifting.

[0049] Among them, the horizontal clamping cylinder and the lifting cylinder both use thin cylinders. Compared with ordinary cylinders, the thin cylinders have smaller axial dimensions and are easier to install.

[0050] To prevent interference with the tooling when the rotary downward clamping cylinders are opened, they are all angled cylinders, including left and right angle cylinders. Compared to conventional lever clamping mechanisms, this is more compact and facilitates workpiece removal. Specifically, in this embodiment, rotary downward clamping cylinders 303 and 4 304 are right angle cylinders, while the remaining cylinders are left angle cylinders. These cylinders are compact, easy to arrange, and expand the operating space of the welding manipulator.

[0051] In this embodiment, the longitudinal beam positioning shaft, each positioning block and each cylinder are fixedly mounted on the positioning plate by bolt connection. The bolt fixing holes are countersunk holes, and the hexagonal bolt heads are sunk into the positioning blocks to avoid interference between the workpiece and the bolt heads, making assembly and disassembly convenient.

[0052] In this embodiment, the positioning surface of each positioning block is determined according to the characteristic shape of the component. Since the curved surface needs to be contoured and is difficult to process, the positioning surface preferably adopts the characteristic plane.

[0053] In this embodiment, Figure 2-3 As shown, there are several hollows on the positioning plate to reserve space for the movement of the welding manipulator and reduce the overall weight of the tooling.

[0054] In this embodiment, considering that the lifting cylinder needs to be opened to eject the workpiece when all the clamps are retracted, and the lifting cylinder 1 and the lifting cylinder 2 need to act synchronously, therefore, Figure 6 As shown, the lifting cylinder 1 4 and the lifting cylinder 2 5 are connected in series, and the air circuit where the lifting cylinder is located is connected in parallel with the air circuits where the other cylinders are located at the output end of the air pressure source, and the two air circuits are independently controlled. Its working principle is:

[0055] When loading, all cylinders are in the retracted state at the same time;

[0056] After the loading is completed, the rotary pressing cylinders 1-9 and the clamping cylinders 1 and 2 are started and are in the extended state, while the lifting cylinders 1 and 2 are in the retracted state.

[0057] After welding is completed, the rotary pressing cylinders 1-9 and the clamping cylinders 1 and 2 are closed and return to the retracted state, and the rotary pressing cylinder rotates away from the top of the workpiece;

[0058] The first and second lifting cylinders extend to lift the workpiece and then retract to complete a welding process.

[0059] It should be noted that in this embodiment, the size of the cylinder should be selected to ensure reliable positioning and clamping, and the clamping force is always consistent. When used as a clamping mechanism, in order to ensure the clamping effect, a 10-20mm stroke margin should be added to the calculated stroke. In this embodiment, the design air pressure is 0.5MPa, and a pressure reducing valve 6 is also designed at the air inlet end of the two air paths. Figure 6 As shown, the pressure reducing valve 6 is connected to the air pressure source 7 .

[0060] In addition, based on the consideration of practicality and safety, this embodiment also provides a manual reversing valve for controlling the cylinder action, and the reversing valve includes a reversing valve 1 8 and a reversing valve 2 9 provided in parallel. Figure 6 As shown, reversing valve 1 (8) is connected in series with all horizontal clamping cylinders and the rotary downward clamping cylinder at one end, and with pressure reducing valve 6 at the outlet of the air pressure source at the other end. This enables coordinated control of clamping cylinders 1 and 2 and rotary downward clamping cylinders 1-9, achieving synchronized movement and effectively reducing displacement during component clamping. Reversing valve 2 (9) is connected in series with two lifting cylinders at one end and with pressure reducing valve 6 at the other end, controlling the lifting cylinders.

[0061] The utility model positions the components of the bus seat frame by setting a positioning shaft and multiple positioning blocks, and clamps and fixes each component synchronously and quickly through a pneumatic clamp, thereby achieving precise positioning and rapid clamping of the bus seat frame, effectively avoiding the situation where the docking position of the seat frame components does not conform to the robot weld, preventing the components from being displaced or deformed due to welding stress during welding, and improving the disassembly speed of the frame after welding.

[0062] It should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Those skilled in the art will appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A bus seat frame welding tool, characterized in that: It includes a positioning plate and a positioning mechanism and a clamping mechanism fixedly mounted on the positioning plate, the positioning mechanism includes a longitudinal beam positioning shaft, a longitudinal beam positioning block, and a plurality of plane positioning blocks and vertical positioning blocks, the plane positioning blocks and vertical positioning blocks are provided with positioning pins for positioning the workpiece to be welded; the clamping mechanism includes a horizontal clamping cylinder and a rotary downward clamping cylinder, the horizontal clamping cylinder cooperates with the vertical positioning block to clamp the workpiece, and the rotary downward clamping cylinder cooperates with the longitudinal beam positioning block and the plane positioning block to clamp the workpiece; It also includes a lifting cylinder for pushing the workpiece after welding to a set height.

2. A bus seat frame welding tool as claimed in claim 1, characterized in that: The longitudinal beam positioning block includes two positioning blocks 1 arranged at both ends of the positioning plate, and both ends of each positioning block 1 are respectively processed with positioning grooves for accommodating the front and rear longitudinal beams.

3. A bus seat frame welding tool as claimed in claim 2, characterized in that: The positioning shaft is fixedly installed on the outer side of the positioning block 1. The front and rear longitudinal beams are provided with shaft holes for the longitudinal beam positioning shaft to pass through. The longitudinal beam positioning shaft cooperates with the longitudinal beam positioning block to position the front and rear longitudinal beams.

4. A bus seat frame welding tool as claimed in claim 1, characterized in that: The vertical positioning block includes a fixed positioning block and a movable positioning block. The fixed positioning block is in contact with one side of the workpiece. The movable positioning block is provided with a guide rod, which cooperates with the horizontal clamping cylinder.

5. A bus seat frame welding tool as claimed in claim 4, characterized in that: The horizontal clamping cylinder is installed on a side of the movable positioning block away from the fixed positioning block, and is used to push the movable positioning block to clamp the workpiece.

6. A bus seat frame welding tool as claimed in claim 1, characterized in that: The lifting cylinders are arranged below the front and rear longitudinal beams, and include a first lifting cylinder and a second lifting cylinder which are arranged diagonally.

7. A bus seat frame welding tool as claimed in claim 6, characterized in that: The horizontal clamping cylinder and the rotary downward clamping cylinder are connected in series to form a first air circuit; the lifting cylinder 1 and the lifting cylinder 2 are connected in series to form a second air circuit, and the first air circuit and the second air circuit are arranged in parallel.

8. A bus seat frame welding tool as claimed in claim 7, characterized in that: The air inlet ends of the first air circuit and the second air circuit are connected to an air pressure source through a pressure reducing valve.

9. A bus seat frame welding tool as claimed in claim 7, characterized in that: A first reversing valve is provided on the first gas path, and a second reversing valve is provided on the second gas path.

10. The bus seat frame welding tool as claimed in claim 1, characterized in that: The horizontal clamping cylinder and the lifting cylinder are both thin cylinders, and the rotary pressing clamping cylinder is an angle cylinder.

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