A bottom compartment welding tool

Abstract

The present invention discloses a bottom compartment welding fixture, comprising a welding fixture, the welding fixture comprising a limit frame composed of a horizontal brace and a longitudinal brace, a traveling fixture tightening cylinder being provided on the horizontal brace on both sides to form an upper limit position for the traveling fixture, and the horizontal brace being connected to a positioner via a connecting seat, a lower support being provided at the bottom of the connecting seat, the lower support forming a lower limit position for the traveling fixture; a bottom compartment tightening cylinder being provided on the longitudinal brace, the protruding end of the bottom compartment tightening cylinder being connected to a crossbeam, and tightening supports being evenly distributed along the length direction of the crossbeam to form an upper limit position for the bottom plate unit. Compared with the prior art, the bottom compartment welding fixture disclosed by the present invention designs the traveling fixture, the bottom compartment and the welding fixture into a "sandwich" welding structure during the welding process, thereby controlling the deformation generated during the bottom compartment welding and meeting the precision requirements of the robot welding.

Description

Technical Field

[0001] The invention belongs to the technical field of bottom compartment welding, and in particular relates to a bottom compartment welding tool. Background Art

[0002] The sanitation vehicle floor consists primarily of a floor frame and a floor plate, measuring 5 meters in length and 2.5 meters in width. Currently, this process is primarily performed manually, using a floor-based approach. The floor frame is composed of various longitudinal and transverse beams, a cylinder mount, a lifting and tilting mount, and a hook mount. Each component connection requires full-position welding, resulting in significant welding distortion and the need for a 180° rotation. The floor plate is located on one side of the floor frame, where welding stress is concentrated. Manual welding requires a squatting position, making the overall labor intensive. The floor plate is made of stainless steel, while the floor frame components are made of carbon steel. Stainless steel has a greater coefficient of thermal expansion than carbon steel, resulting in significant welding distortion. This localized deformation of the floor plate during welding can lead to gaps between the floor frame and the floor plate. Without control measures, these gaps can exceed 10 mm, severely impacting subsequent welds. Manual welding requires a minimum gap of 2 mm at each joint between the floor frame and the floor plate. Robotic welding requires a minimum gap of 1 mm at each joint between the floor frame and the floor plate. During manual operation, a local fixed mobile clamping measure is first used, and then welding measures are used to adjust the position where the gap is large. However, the overall deformation after welding is large and mechanical correction is required, which results in low production efficiency and high manufacturing cost.

[0003] Application No. 202011030308.2 discloses a rotary intelligent automatic welding workstation for the five-piece passenger car body frame, comprising two or more railway wagon chassis workstations, which are arranged sequentially along the production and transportation direction of the railway wagon chassis, and the center lines of the two or more railway wagon chassis workstations are located on the same straight line; the railway wagon chassis flexible production line workstations also include an automatic transfer vehicle, through which the railway wagon chassis shuttles between the two or more railway wagon chassis workstations to sequentially complete the various production processes of the railway wagon chassis. This production line can achieve assembly line rhythm production, and the finished chassis automatically rolls off the production line after automatic inspection, fundamentally simplifying the production method of the wagon chassis steel structure. However, during the welding process, it is not proposed to fix the welded parts during the welding process, which can easily cause the welded parts to deform during the welding process and cannot meet the robot's precision requirements during the welding process.

[0004] Also disclosed in application number 202010773394.X is a flexible production line and production process for railway freight car chassis, including a welding workshop and a rotary positioner. A loading and unloading station is provided in front of the welding workshop, and a welding station is provided in the welding workshop. The front half of the rotary positioner is provided in front of the welding workshop, and the rear half of the rotary positioner is provided below the welding workshop. The front half of the rotary positioner is provided as the first station, and the rear half is provided as the second station. The first station and the second station are respectively provided with welding tooling. A rotating spindle is connected to the lower side of the rotary positioner, and the rotating spindle is connected to the driving device through a transmission mechanism. The rotary positioner can rotate around the rotating spindle. A grating protection device is provided in front of the rotary positioner. In the welding workshop, there are respectively provided on the left and right sides of the rotary positioner. At least one welding robot is installed, each of which is mounted on a base. Each robot's mechanical arm is equipped with a dedicated welding gun. Each robot is equipped with a laser positioning tracking device and an anti-collision device. Each robot is equipped with a wire feeder, a wire drum, and a gun cleaning, wire cutting, and silicone oil spraying device on one side. A hoisting device is installed in front of the welding room. A welding room monitoring device is installed inside the welding room. A welding room monitoring system display is installed outside the welding room. A dust removal duct device is installed on the top of the welding room. A safety protection door is installed on the rear side of the welding room. An installation and maintenance passage is installed inside the welding room. A robot control cabinet, a pneumatic system control cabinet, and a workstation master control cabinet are installed on one side of the welding room. During the welding process, only the edges of the welded parts are limited, and the upper part of the welded parts is not limited, which easily causes deformation of the upper part of the welded parts. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a bottom compartment welding tool.

[0006] The specific plan is as follows:

[0007] A bottom compartment welding tooling includes a welding fixture, which includes a limit frame composed of a transverse brace and a longitudinal brace. A traveling tooling tightening cylinder is arranged on the transverse brace on both sides to form an upper limit position for the traveling tooling, and the transverse brace is connected to the positioner through a connecting seat. A lower support is arranged at the bottom of the connecting seat, and the lower support forms a lower limit position for the traveling tooling; a bottom compartment tightening cylinder is arranged on the longitudinal brace, and the protruding end of the bottom compartment tightening cylinder is connected to a transverse beam, and the transverse beam is evenly distributed with tightening supports along the length direction to form an upper limit position for the bottom plate unit.

[0008] The accompanying tooling is composed of a frame structure including an accompanying tooling horizontal brace and an accompanying tooling longitudinal brace. Middle longitudinal braces are evenly arranged between the accompanying tooling longitudinal braces on both sides. A gap is formed between two adjacent accompanying tooling longitudinal braces. The bottom plate clamping part is arranged on the accompanying tooling longitudinal brace.

[0009] The bottom plate clamping part is composed of at least two bottom plate clamping mechanisms, and the bottom plate clamping mechanism includes a bottom plate clamping base fixed on the longitudinal support, a bottom plate clamping support seat fixed on the upper surface of the bottom plate clamping base, and a U-shaped block fixed on the upper surface of the bottom plate clamping support seat. The U-shaped block is used to position the skeleton monomer, and a bottom compartment clamp is arranged above the U-shaped block for fixing the bottom compartment.

[0010] A taper pin is provided on the top of the lower support, the taper pin cooperates with a taper pin sleeve on the accompanying tooling, and cushion blocks are provided on both sides of the taper pin.

[0011] The present invention discloses a bottom compartment welding tool. Compared with the prior art, during the welding process, the accompanying tool, the bottom compartment and the welding tool are designed as a "sandwich" welding structure to control the deformation generated during the bottom compartment welding and meet the accuracy requirements of robot welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural diagram of the bottom compartment welding system;

[0013] Figure 2 This is a schematic diagram of the skeleton docking station structure;

[0014] Figure 3 This is a schematic diagram of the skeleton welding station structure;

[0015] Figure 4 This is a schematic diagram of the bottom plate docking station structure;

[0016] Figure 5 This is a schematic diagram of the bottom plate welding station structure;

[0017] Figure 6 This is a schematic diagram of the accessory welding and quality acceptance station structure;

[0018] Figure 7 This is a schematic diagram of the bottom compartment buffer station structure;

[0019] Figure 8 It is a structural diagram of the skeleton docking tooling;

[0020] Figure 9 Schematic diagram of the structure of the skeleton clamping monomer;

[0021] Figure 10 This is a schematic diagram of the welding tooling structure;

[0022] Figure 11 Schematic diagram of the connecting seat structure;

[0023] Figure 12 This is a schematic diagram of the welding fixture structure;

[0024] Figure 13 This is a schematic diagram of the accompanying tooling structure;

[0025] Figure 14 Schematic diagram of the jacking support mechanism;

[0026] Figure 15 Schematic diagram of the bottom plate clamping monomer structure.

[0027] In the figure: bottom compartment frame docking station 1, RGV car A1-1, frame docking tool 1-2, frame clamping part 1-3, frame clamping support 1-3-1, frame clamping fixed block 1-3-2, frame clamping cylinder 1-3-3, frame clamping top block 1-3-4, frame clamping fixed block 1-3-5, bottom compartment frame welding station 2, bottom compartment bottom plate docking station 3, RGV car B3-1, accompanying tool clamping part 3-2, bottom compartment bottom plate welding station 4, accessory welding and quality acceptance station 5, bottom compartment buffer station 6, accompanying tool 7, accompanying tool cross brace 7-1, accompanying tool longitudinal brace 7-2, bottom Plate clamping part 7-3, bottom plate clamping base 7-3-1, bottom plate clamping support base 7-3-2, U-shaped block 7-3-3, clamp 7-3-4, skeleton 8, bottom plate 9, positioner 10, welding device 11, welding tool 12, welding fixture 12-1, cross brace 12-1-1, longitudinal brace 12-1-2, accompanying tool tightening cylinder 12-1-3, connecting base 12-1-4, upper support 12-1-5, lower support 12-1-6, bottom compartment tightening cylinder 12-2, cross beam 12-3, tightening support 12-4, gantry slide 13, lifting equipment 14, RGV vehicle C15. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the implementation of the present invention, not the entire implementation. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0029] like Figures 1-15As shown, the present invention discloses a bottom compartment welding tool, including a welding fixture 12-1, the welding fixture 12-1 includes a limit frame composed of a transverse brace 12-1-1 and a longitudinal brace 12-1-2, and the transverse brace 12-1-1 on both sides is provided with a tightening cylinder 12-1-3 for the accompanying tool 7 to form an upper limit position for the accompanying tool 7, and the transverse brace 12-1-1 is connected to the positioner 10 through a connecting seat 12-1-4, and a lower support 12-1-6 is provided at the bottom of the connecting seat 12-1-4, and the lower support 12-1-6 forms a lower limit position for the accompanying tool 7; the longitudinal brace 12-1-2 is provided with a bottom compartment tightening cylinder 12-2, and the protruding end of the bottom compartment tightening cylinder 12-2 is connected to the crossbeam 12-3, and the crossbeam 12-3 is evenly distributed with tightening supports 12-4 along the length direction to form a single upper limit position for the bottom plate 9. This welding tool is suitable for the frame welding tool 12 and the bottom compartment welding tool 13.

[0030] like Figures 1-15 As shown, the present invention discloses a bottom compartment welding system, comprising: a bottom compartment frame docking station 1, a bottom compartment frame welding station 2, a bottom compartment bottom plate docking station 3, and a bottom compartment bottom plate welding station 4;

[0031] The bottom car frame docking station 1 includes an RGV car A1-1 that travels back and forth between the bottom car frame docking station 1 and the bottom car frame welding station 2. A frame docking tool 1-2 is fixed on the top of the RGV car A1-1. The RGV car A1-1 uses an existing RGV car. The fixed frame docking tool 1-2 is set on the top of the RGV car A1-1. The RGV car A1-1 and the frame docking tool 1-2 are positioned and fixed by a cone pin structure. The frame clamping part 1-3 is fixed on the top of the frame docking tool 1-2 and the accompanying tool 7 can be detachably placed. The accompanying tooling 7 has a frame structure, the skeleton clamping part 1-3 passes through the gap of the frame and clamps the skeleton 8 monomer, and the bottom plate clamping part 7-3 is set around the gap; at the beginning, the skeleton clamping monomer should be installed in the mounting hole according to the skeleton drawing, and the gap of the accompanying tooling 7 should be passed through the skeleton clamping monomer and installed on the skeleton docking station 1, and then the bottom plate clamping mechanism should be installed on the longitudinal support 12-1-2 according to the bottom compartment drawing: In the positioning of the carbon steel material of the skeleton 8 monomer, the welds of some materials are blocked by the later-installed parts and need to be manually welded in advance.

[0032] The bottom car frame welding station 2 includes a frame welding tool 12 controlled by a frame welding positioner 10. The frame welding tool 12 is used to receive the accompanying tool 7 transported by the RGV car A1-1, and to limit the accompanying tool 7 and the frame 8 up and down to form a "sandwich" structure, which is welded by a robot frame welding device 11; after the frame 8 is positioned individually, click to start on the human-computer interaction interface of the workstation, and the accompanying tool 7, the bottom car frame 8 and the customized tool fixture are transported from the bottom car frame docking station 1 to the bottom car frame welding station 2 along with the RGV car A1-1.

[0033] The bottom compartment floor plate docking station 3 includes an RGV vehicle B3-1 that travels back and forth between the bottom compartment frame welding station 2, the bottom compartment floor plate docking station 3 and the bottom compartment floor plate welding station 4. The top periphery of the RGV vehicle B3-1 (the structure of the fixed accompanying tooling on the top of the RGV vehicle B3-1 and the top of the RGV vehicle C15 is the same) is fixed with an accompanying tooling clamping part 3-2 to receive and release the accompanying tooling 7, and the bottom plate clamping part 7-3 is used to clamp the bottom plate 9; the bottom plate 9 is composed of at least two bottom plate 9 monomers. After the bottom plate 9 monomers are positioned, they are spot welded between two adjacent bottom plate 9 monomers. The accompanying tooling clamping part 3-2 is fixed by clamping the frame periphery of the accompanying tooling 7, and the accompanying tooling 7 and the RGV vehicle B3-1 are positioned by tapered pins.

[0034] The bottom compartment bottom plate welding station 4 includes a bottom compartment welding tool 12 controlled by a bottom compartment welding positioner 10. The bottom compartment welding tool 12 is used to receive and release the accompanying tool 7 transported by the RGV vehicle B3-1, and to limit the accompanying tool 7, the bottom plate 9 monomer, and the skeleton 8 up and down to form a "sandwich" structure, and welding is performed by a robot bottom compartment welding device 11.

[0035] The skeleton welding tool 12 and the bottom compartment welding tool 12 both include a welding fixture 12-1, which includes a limit frame composed of a transverse brace 12-1-1 and a longitudinal brace 12-1-2. The transverse brace 12-1-1 on both sides is provided with a tightening cylinder 12-1-3 for the accompanying tool 7 to form an upper limit position for the accompanying tool 7, and the transverse brace 12-1-1 is connected to the positioner 10 through a connecting seat 12-1-4. The connecting seat 12-1-4 A lower support 12-1-6 is provided at the bottom, forming the lower limit for the accompanying tooling 7. The longitudinal support 12-1-2 is provided with a bottom compartment tightening cylinder 12-2, which acts directly on the main longitudinal beam of the skeleton, forming the upper limit for the skeleton unit. For the bottom plate, a crossbeam 12-3 can be connected to the extended end of the bottom compartment tightening cylinder 12-2. The crossbeam 12-3 has tightening supports 12-4 evenly distributed along the length to form the upper limit for the bottom plate 9 unit. The skeleton welding tooling 12 and the bottom compartment welding tooling 12 are also equipped with a water-cooled welding system. The arc welding software package meets the functional requirements of contact sensing, arc tracking, multi-layer and multi-pass, and the robot repeatability is ±0.1mm. The workstation area is equipped with grating sensing hardware. When personnel or materials enter the sensing area, the equipment stops running immediately. The emergency stop signals of the robot workstation are connected to the PLC to achieve an effective response in the first time.

[0036] An upper support 12-1-5 is provided on the top of the connecting base 12-1-4, and the upper support 12-1-5 is connected to the longitudinal support 12-1-2. A taper pin is provided in the middle of the lower support 12-1-6. The taper pin cooperates with the taper pin sleeve at the bottom of the transverse support 12-1-17-1 of the accompanying tool 7 to achieve the effect of positioning the accompanying tool 7. Pads are provided on both sides of the taper pin. When the accompanying tool 7 is transported to the position of the welding tool 12, the electrical sensor senses the position, the welding tool 12 is lowered along with the positioner 10, and the tightening cylinder 12-1-3 of the accompanying tool 7 is opened.

[0037] For the skeleton, first, the welding device 11 (robot) locates the upper plane of the main longitudinal beam of the bottom car skeleton 8 from top to bottom; the robot accurately identifies the weld position through the wire positioning function, and first welds the vertical welds of the bottom car skeleton 8 and the flat welds of the upper plane; after the vertical welds and the flat welds of the upper plane of the bottom car skeleton 8 are welded, the lifting double-column single-axis welding positioner 10 locates the accompanying tooling 7, lifts the accompanying tooling 7 from the bottom to the top, and the accompanying tooling 7 is separated from the accompanying tooling clamping part 3-2, and the accompanying tooling clamping part 3-2 returns to the bottom car skeleton docking station 1 with the RGV car A1-1, and the welding tooling 12 tightens the upper plane of the main longitudinal beam of the bottom car skeleton 9 from the top to the bottom for a second time, which plays a role in rigid fixation and controlling welding deformation. As the lifting double-column single-axis welding positioner 10 flips 180°, the robot uses the wire positioning function to accurately identify the weld position and welds the flat weld on the lower plane of the bottom car frame 8; after the flat weld on the lower plane of the bottom car frame 8 is completed, the lifting double-column single-axis welding positioner 10 flips 180°.

[0038] For the bottom plate, first, the welding device 11 (robot) locates the bottom plate 9 from top to bottom, 50 mm away from the splicing weld position; the robot uses the laser positioning function to accurately identify the weld position and first welds the flat splicing weld on the stainless steel bottom plate 9; after the welding of the flat splicing weld on the stainless steel bottom plate 9 is completed, the lifting double-column single-axis welding positioner 10 locates the accompanying tooling 7, lifts the accompanying tooling 7 from the bottom to the top, and the accompanying tooling 7 is separated from the accompanying tooling clamping part 3-2. The accompanying tooling clamping part 3-2 returns to the bottom plate docking station 3 with the RGV vehicle B3-1, and the welding tooling 12 presses the upper plane of the bottom plate 9 from top to bottom for the second time, pressing the large area of ​​the bottom plate 9, which plays a role in rigid fixation and controlling welding deformation. As the lifting double-column single-axis welding positioner 10 flips 180°, the robot uses the laser positioning function to accurately identify the weld position and weld the connecting weld between the bottom plate 9 and the frame 8; after the connecting weld between the bottom plate 9 and the bottom compartment frame 8 is completed, the lifting double-column single-axis welding positioner 10 flips 180°.

[0039] The bottom car frame welding station 2 and the bottom car floor welding station 4 both include a gantry slide 13 arranged above the welding fixture 12-1, on which a seven-axis welding robot is slidably arranged, and the seven-axis welding robot has an integrated wire positioning function; the positioner 10 is a lifting double-column single-axis welding positioner 10;

[0040] The bottom compartment frame docking station 1 also includes a frame lifting device 14 for the above materials and a welding machine cantilever wire feeding device;

[0041] The floor panel docking station 3 further comprises a panel lifting device 14 .

[0042] The accompanying tooling 7 is composed of a frame structure including an accompanying tooling horizontal support 7-1 and an accompanying tooling longitudinal support 7-2. The middle longitudinal support 7-2 is evenly arranged between the two side longitudinal supports 7-2. A gap is formed between two adjacent accompanying tooling longitudinal supports 7-2. The bottom plate clamping portion 7-3 is arranged on the accompanying tooling 7 longitudinal supports 7-2.

[0043] The bottom plate clamping part 7-3 is composed of at least two bottom plate clamping mechanisms, and the bottom plate clamping mechanism includes a bottom plate clamping base 7-3-1 fixed on the longitudinal support 7-2, a bottom plate clamping support seat 7-3-2 is fixed on the upper surface of the bottom plate clamping base 7-3-1, and a U-shaped block 7-3-3 is fixed on the upper surface of the bottom plate clamping support seat 7-3-2. The U-shaped block 7-3-3 is used to position the skeleton 8 alone, and a bottom compartment clamp 7-3-4 is provided above the U-shaped block 7-3-3 to fix the bottom compartment.

[0044] The skeleton docking tooling 1-2 includes a skeleton docking base fixed on the top of the RGV vehicle A1-1, and mounting holes are evenly distributed on the top of the skeleton docking base; according to the mounting holes at different positions, the skeleton clamping units are positioned at different positions according to the production of different models of bottom compartments.

[0045] The skeleton clamping part 1-3 is composed of at least one skeleton clamping unit, which is fixed in the mounting hole; the skeleton clamping unit includes a skeleton clamping support 1-3-1, a skeleton clamping fixing block 1-3-5 is arranged on the upper part of the skeleton clamping support 1-3-1, a skeleton clamping cylinder 1-3-3 is arranged on the side wall of the skeleton clamping support 1-3-1, the movable end of the skeleton clamping cylinder 1-3-3 is fixed to the skeleton clamping tightening block 1-3-4, and the skeleton clamping cylinder 1-3-3 adjusts the distance between the skeleton clamping tightening block 1-3-4 and the skeleton clamping fixing block 1-3-5.

[0046] The bottom compartment floor welding station 4 further includes an RGV car C15, which travels back and forth between the bottom compartment floor welding station 4 and the accessory welding and quality acceptance station 5.

[0047] The present invention also discloses a bottom compartment welding process, comprising:

[0048] Step 1: Position and clamp the skeleton 8, and set a portable tool 7 under the skeleton 8 to eject the skeleton 8 after welding;

[0049] Step 2: Weld the upper surface of the frame 8 by positioning the welding wire. After welding, press and flip the frame 8 and the accompanying tooling 7. Then, weld the lower surface of the frame 8 by positioning the welding wire.

[0050] Step 3: Position and clamp the bottom plate 9 monomers, and perform spot welding between the two bottom plate 9 monomers;

[0051] Step 4: The upper surface of the bottom plate 9 is welded by laser positioning. After welding, the bottom plate 9, the frame 8 and the accompanying tooling 7 are pressed and turned over, and the lower surface of the bottom plate 9 is welded by laser positioning;

[0052] Step 5: Flip the bottom box 180 degrees after welding so that the frame 8 faces upwards, and weld the accessories;

[0053] Step 6: Check the overall quality of the bottom compartment. After passing the inspection and re-inspection, store it in the bottom compartment buffer station 6.

[0054] During the process from step 1 to step 2, the positioned frame 8 and accompanying tooling 7 are transported by the RGV vehicle A1-1 to the bottom compartment frame welding station 2;

[0055] During the process from step 2 to step 3 and from step 3 to step 4, the welded skeleton 8 and accompanying tooling 7 are transported to the bottom compartment floor docking station 3 by the RGV vehicle B3-1, and the bottom plate 9, skeleton 8 and accompanying tooling 7 after positioning are transported to the bottom compartment floor welding station 4.

[0056] In step six, after the welded bottom compartment is placed in the bottom compartment buffer station 6, the accompanying tool 7 is transported to the bottom of the skeleton 8 monomer that needs to be positioned and clamped by the accompanying tool 7 lifting equipment 14.

[0057] The present invention discloses a bottom compartment welding system and a welding process thereof. Compared with the prior art, 1. the docking direction of the skeleton 8 and the bottom plate 9 is adjusted. Starting from the skeleton docking station 1, the docking direction of the bottom plate is kept on the upper side of the bottom compartment skeleton, so that the accompanying tooling is always kept on the lower side of the skeleton, supporting the skeleton and facilitating the hanging and docking of the bottom plate from top to bottom; 2. The accompanying tooling 7 is used to fix the bottom compartment, which moves between the stations with the RGV vehicle, rigidly fixes the bottom compartment and controls welding deformation; 3. During the welding process, the accompanying tooling 7, the bottom compartment and the welding tooling 12 are designed as a "sandwich" welding structure to control the deformation generated in the bottom compartment welding and meet the precision requirements of robot welding; 4. It gets rid of the stall-type production mode and realizes robot-automated welding. The material flipping does not require a crane, and the positioner 10 is used for automatic flipping, thereby improving production safety.

[0058] The technical means disclosed in the solutions of the present invention are not limited to those disclosed in the above-mentioned embodiments, but also include technical solutions composed of any combination of the above-mentioned technical features. It should be noted that those skilled in the art may make various improvements and modifications without departing from the principles of the present invention, and such improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A bottom compartment welding tool, characterized in that: It includes a welding fixture, which includes a limit frame composed of a horizontal brace and a longitudinal brace. The horizontal braces on both sides are provided with a traveling tool tightening cylinder to form an upper limit for the traveling tool, and the horizontal brace is connected to the positioner through a connecting seat. The bottom of the connecting seat is provided with a lower support to form a lower limit for the traveling tool; the longitudinal brace is provided with a bottom compartment tightening cylinder, the protruding end of the bottom compartment tightening cylinder is connected to the crossbeam, and the crossbeam has tightening supports evenly distributed along the length direction to form an upper limit for the bottom plate unit; the bottom compartment welding fixture is used to receive and release the traveling tool, and to limit the traveling tool, the bottom plate unit, and the frame up and down to form a "sandwich" structure; The accompanying tooling is composed of a frame structure including accompanying tooling horizontal braces and accompanying tooling longitudinal braces. Middle longitudinal braces are evenly arranged between the accompanying tooling longitudinal braces on both sides. A gap is formed between two adjacent accompanying tooling longitudinal braces. The bottom plate clamping part is arranged on the accompanying tooling longitudinal braces. The bottom plate clamping part is composed of at least two bottom plate clamping mechanisms, and the bottom plate clamping mechanism includes a bottom plate clamping base fixed on the longitudinal support, a bottom plate clamping support seat fixed on the upper surface of the bottom plate clamping base, and a U-shaped block fixed on the upper surface of the bottom plate clamping support seat. The U-shaped block is used to position the skeleton monomer, and a bottom compartment clamp is arranged above the U-shaped block for fixing the bottom compartment.

2. A bottom compartment welding tool according to claim 1, characterized in that: A taper pin is arranged on the top of the lower support, and the taper pin matches with a taper pin sleeve on the accompanying tooling, and pads are arranged on both sides of the taper pin.

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