CN115890105A - Bottom carriage welding tool - Google Patents

Abstract

The invention discloses a bottom carriage welding tool which comprises a welding fixing device, wherein the welding fixing device comprises a limiting frame consisting of cross supports and longitudinal supports, the cross supports on two sides are provided with follow tools for tightly pushing against a cylinder to form an upper limit for the follow tools, the cross supports are connected with a position changer through a connecting seat, the bottom of the connecting seat is provided with a lower support, and the lower support forms a lower limit for the follow tools; the longitudinal support is provided with a bottom compartment jacking cylinder, the extending end of the bottom compartment jacking cylinder is connected with a cross beam, and jacking supports are uniformly distributed on the cross beam along the length direction to form upper limit on the bottom plate monomer. Compared with the prior art, the bottom carriage welding tool disclosed by the invention has the advantages that in the welding process, the following tool, the bottom carriage and the welder are designed into a sandwich welding structure, the deformation generated in the welding process of the bottom carriage is controlled, and the precision requirement of robot welding is met.

Description

Bottom carriage welding tool

Technical Field

The invention belongs to the technical field of bottom carriage welding, and particularly relates to a bottom carriage welding tool.

Background

The bottom compartment of the sweeper for the environmental sanitation products mainly comprises a bottom compartment framework and a bottom plate, is 5m in length and 2.5m in width, and is mainly used for spread-type manual operation at present. The bottom box framework is composed of materials such as longitudinal beams, oil cylinder seats, lifting turnover seats, lock hook seats and the like, the mutual connection positions of all parts are required to be welded in all positions, the welding deformation is large, and 180-degree turnover welding is required; the bottom plate is positioned on one side of the bottom box framework, the welding stress is concentrated, the welding can be performed only in a squatting position during manual welding, and the integral labor intensity is high; the bottom plate is made of stainless steel, the bottom box framework part is made of carbon steel, the thermal expansion coefficient of the stainless steel is larger than that of the carbon steel, welding deformation is large, local deformation of the bottom plate in the welding process is large, a gap is formed in the position of a welding line of the framework and the bottom plate, the gap is larger than 10mm under the condition that no control measure is adopted, and welding of a subsequent welding line is seriously influenced. During manual operation, the butt joint clearance of not more than 2mm is required to be controlled at each connecting position of the bottom box framework and the bottom plate, and welding can be performed; when the robot is used for automatic welding, the butt joint gap of not more than 1mm needs to be controlled, and then the connecting welding line of the framework and the bottom plate can be welded. During manual operation, a local fixed movable type compaction measure is adopted, the position with a large gap is adjusted by a welding measure, but the deformation is large after the integral welding, mechanical correction is needed, the production efficiency is low, and the manufacturing cost is high.

The application number is 202011030308.2, and discloses a rotary intelligent automatic welding workstation for five large sheets of a passenger car body framework, which comprises more than 2 railway wagon chassis stations, wherein the more than 2 railway wagon chassis stations are continuously and sequentially arranged along the production and transportation direction of a railway wagon chassis, and the central lines of the more than 2 railway wagon chassis stations are positioned on the same straight line; the flexible production line station of the railway wagon underframe further comprises an automatic transmission vehicle, and the railway wagon underframe shuttles among more than 2 railway wagon underframe stations through the automatic transmission vehicle so as to sequentially complete each process of the railway wagon underframe production. This production line can realize assembly line beat production, and the finished product chassis is automatic to be qualified for the next round of competitions after automated inspection, and fundamentally has simplified the production mode of freight train chassis steel construction, but in welding process, does not propose in welding process, fixes the welding piece, just makes welding piece emergence deformation in welding process easily to the required precision of robot can not be satisfied in welding process.

Also disclosed in application No. 202010773394, X is a flexible production line of a rail wagon underframe and a production process thereof, comprising a welding workshop and a rotary positioner, wherein a feeding and discharging station is arranged in front of the welding workshop, a welding station is arranged in the welding workshop, the first half part of the rotary positioner is arranged in front of the welding workshop, the second half part of the rotary positioner is arranged below the welding workshop, the first half part of the rotary positioner is arranged as a first station, the second half part of the rotary positioner is arranged as a second station, welding tools are respectively arranged on the first station and the second station, a rotary main shaft is connected to the lower side of the rotary positioner, the rotary main shaft is connected with a driving device through a transmission mechanism, the rotary positioner can rotate around the rotary main shaft, a grating protection device is arranged in front of the rotary positioner, at least one welding robot is respectively arranged on the left side and the right side of the rotary positioner in the welding workshop, the welding robots are respectively arranged on a base, a robot arm of any one welding robot is respectively provided with a special robot, a laser positioning tracking device and a welding gun is arranged on one side of the welding workshop, a welding robot is provided with a welding gun, a safety welding robot lifting and a welding robot, a welding gun is arranged in front of a welding workshop, a welding robot lifting and a welding robot monitoring control welding workshop, a welding robot and a welding robot lifting and a welding robot lifting control welding robot are arranged in front of a welding workshop, a welding robot. In the welding process, only the edge of the welding part is limited, and the upper part of the welding part is not limited, so that the upper part of the welding part is easy to deform.

Disclosure of Invention

In order to solve the technical problem, the invention provides a bottom compartment welding tool.

The specific scheme is as follows:

a bottom carriage welding tool comprises a welding fixing device, wherein the welding fixing device comprises a limiting frame consisting of cross braces and longitudinal braces, the cross braces on two sides are provided with follow tools to tightly push against a cylinder to form an upper limit for the follow tools, the cross braces are connected with a positioner through a connecting seat, the bottom of the connecting seat is provided with a lower support, and the lower support forms a lower limit for the follow tools; the longitudinal support is provided with a bottom compartment jacking cylinder, the extending end of the bottom compartment jacking cylinder is connected with a cross beam, and jacking supports are uniformly distributed on the cross beam along the length direction to form upper limit on the bottom plate monomer.

The pallet is of a frame structure consisting of pallet cross braces and pallet longitudinal braces, the middle longitudinal braces are uniformly arranged between the two pallet longitudinal braces at the two sides, a gap is formed between every two adjacent pallet longitudinal braces, and the bottom plate clamping part is arranged on the pallet longitudinal braces;

the bottom plate clamping part comprises at least two bottom plate clamping mechanisms, the bottom plate clamping mechanisms comprise bottom plate clamping bases fixed on the longitudinal support, bottom plate clamping supporting seats are fixed on the upper surfaces of the bottom plate clamping bases, U-shaped blocks are fixed on the upper surfaces of the bottom plate clamping supporting seats and used for being positioned with the framework monomer, and bottom box clamping bottom boxes are arranged above the U-shaped blocks and fixed.

The top of the lower support is provided with a taper pin, the taper pin is matched with a taper pin sleeve on the follow-up tool, and cushion blocks are arranged on two sides of the taper pin.

Compared with the prior art, the bottom carriage welding tool disclosed by the invention has the advantages that in the welding process, the following tool, the bottom carriage and the welder are designed into a sandwich welding structure, the deformation generated in the welding process of the bottom carriage is controlled, and the precision requirement of robot welding is met.

Drawings

FIG. 1 is a schematic view of a bottom welding system;

FIG. 2 is a schematic structural view of a framework docking station;

FIG. 3 is a schematic structural view of a skeleton welding station;

FIG. 4 is a schematic structural diagram of a bottom plate docking station;

FIG. 5 is a schematic view of a base plate welding station;

FIG. 6 is a schematic view of the structure of an accessory welding and quality acceptance station;

FIG. 7 is a schematic diagram of a bottom box buffer storage station structure;

FIG. 8 is a schematic structural view of a framework docking tool;

FIG. 9 is a schematic structural view of a frame clamping unit;

FIG. 10 is a schematic view of a welding tool structure;

FIG. 11 is a schematic view of a connecting seat structure;

FIG. 12 is a schematic view of a welding fixture;

FIG. 13 is a schematic view of a traveling tool structure;

FIG. 14 is a schematic view of a jacking leg mechanism;

FIG. 15 is a schematic view of a bottom plate clamping unit.

In the figure: a bottom carriage framework butt joint station 1, an RGV vehicle A1-1, a framework butt joint tool 1-2, a framework clamping part 1-3, a framework clamping support 1-3-1, a framework clamping fixed block 1-3-2, a framework clamping cylinder 1-3, a framework clamping puller block 1-3-4, a framework clamping fixed block 1-3-5, a bottom carriage framework welding station 2, a bottom carriage bottom plate butt joint station 3, an RGV vehicle B3-1, a follower tool clamping part 3-2, a bottom carriage bottom plate welding station 4, an accessory welding and quality inspection station 5, a bottom carriage cache station 6, a follower tool 7 and a follower tool cross brace 7-1, the device comprises a trailing tool longitudinal support 7-2, a bottom plate clamping part 7-3, a bottom plate clamping base 7-3-1, a bottom plate clamping support seat 7-3-2, a U-shaped block 7-3-3, a clamp 7-3-4, a framework 8, a bottom plate 9, a positioner 10, a welding device 11, a welding tool 12, a welding fixing device 12-1, a cross support 12-1-1, a longitudinal support 12-1-2, a trailing tool jacking cylinder 12-1-3, a connecting seat 12-1-4, an upper support 12-1-5, a lower support 12-1-6, a bottom carriage jacking cylinder 12-2, a cross beam 12-3, a jacking support 12-4, a gantry type sliding rack 13, a hoisting device 14 and an RGV vehicle C15.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are merely exemplary of the invention, and that all other embodiments that can be made by one skilled in the art without inventive faculty are within the scope of the invention.

As shown in figures 1-15, the invention discloses a bottom carriage welding tool, which comprises a welding fixing device 12-1, wherein the welding fixing device 12-1 comprises a limiting frame consisting of cross braces 12-1-1 and longitudinal braces 12-1-2, the cross braces 12-1-1 on two sides are provided with a follow tool 7 tightly pushing against an air cylinder 12-1-3 to form upper limiting on the follow tool 7, the cross braces 12-1-1 are connected with a positioner 10 through connecting seats 12-1-4, the bottoms of the connecting seats 12-1-4 are provided with lower supporting seats 12-1-6, and the lower supporting seats 12-1-6 form lower limiting on the follow tool 7; the longitudinal support 12-1-2 is provided with a bottom carriage jacking cylinder 12-2, the extending end of the bottom carriage jacking cylinder 12-2 is connected with a cross beam 12-3, and jacking supports 12-4 are uniformly distributed on the cross beam 12-3 along the length direction to limit the upper part of the single bottom plate 9. The welding tool is suitable for the framework welding tool 12 and the bottom compartment welding tool 13.

As shown in fig. 1-15, the present invention discloses a bottom welding system, comprising: a bottom carriage framework butt joint station 1, a bottom carriage framework welding station 2, a bottom carriage bottom plate butt joint station 3 and a bottom carriage bottom plate welding station 4;

the system comprises a bottom carriage framework butt joint station 1, an RGV vehicle A1-1 top fixed framework butt joint tool 1-2, an RGV vehicle A1-1 and an existing RGV vehicle are selected from the bottom carriage framework butt joint station 1 and the bottom carriage framework welding station 2, the fixed framework butt joint tool 1-2 is arranged at the top of the RGV vehicle A1-1, the RGV vehicle A1-1 and the framework butt joint tool 1-2 are positioned and fixed through a taper pin structure, a framework clamping part 1-3 is fixed at the top of the framework butt joint tool 1-2 and a follow tool 7 is detachably placed on the framework butt joint tool 1-2, the follow tool 7 is of a framework structure, a framework clamping part 1-3 penetrates through a framework gap and clamps a framework 8 monomer, and a bottom plate clamping part 7-3 is arranged at the periphery of the gap; the framework clamping single body is arranged in the mounting hole according to a framework drawing at first, a gap of the follow tool 7 penetrates through the framework clamping single body and is arranged on a framework butt joint station 1, and then the bottom plate clamping mechanism is arranged on a longitudinal support 12-1-2 according to a bottom box drawing: in the positioning of the single carbon steel material of the framework 8, the welding seam of the individual material is shielded by the rear-mounted part and needs to be manually welded in advance.

The bottom carriage framework welding station 2 comprises a framework welding tool 12 controlled by a framework welding positioner 10, wherein the framework welding tool 12 is used for receiving the follow tool 7 conveyed by the RGV vehicle A1-1, limiting the follow tool 7 and the framework 8 up and down to form a sandwich-like structure, and welding by a robot framework welding device 11; after the framework 8 monomer is positioned, clicking and starting are carried out on a man-machine interaction interface of a workstation, and the following tool 7, the bottom carriage framework 8 and the customized tool fixture are conveyed to the bottom carriage framework welding station 2 from the bottom carriage framework butt joint station 1 along with the RGV vehicle A1-1.

The bottom carriage bottom plate butt joint station 3 comprises an RGV vehicle B3-1, an RGV vehicle B3-1 (the structure of the top of the RGV vehicle B3-1 is the same as that of the fixed accompanying tool at the top of the RGV vehicle C15), a top peripheral fixed accompanying tool clamping part 3-2 for receiving and releasing the accompanying tool 7, and a bottom plate clamping part 7-3 for clamping a bottom plate 9, wherein the RGV vehicle B3-1, the RGV bottom plate butt joint station 3 and the bottom carriage bottom plate welding station 4 move back and forth; the bottom plate 9 is composed of at least two bottom plate 9 monomers, the bottom plate 9 monomers are fixed between two adjacent bottom plate 9 monomers through spot welding after being positioned, the follow tool clamping part 3-2 is fixed through clamping the periphery of a frame of the follow tool 7, and the follow tool 7 and the RGV vehicle B3-1 are positioned through taper pins.

The bottom carriage and bottom plate welding station 4 comprises a bottom carriage welding tool 12 controlled by a bottom carriage welding positioner 10, the bottom carriage welding tool 12 is used for receiving and releasing a follow tool 7 conveyed by an RGV (red-green-V) vehicle B3-1, the follow tool 7, a bottom plate 9 single body and a framework 8 are limited up and down to form a structure similar to a sandwich, and welding is carried out through a robot bottom carriage welding device 11.

The framework welding tool 12 and the bottom carriage welding tool 12 both comprise a welding fixing device 12-1, the welding fixing device 12-1 comprises a limiting frame consisting of cross braces 12-1-1 and longitudinal braces 12-1-2, the cross braces 12-1-1 on two sides are provided with a follow tool 7 and push against an air cylinder 12-1-3 to form upper limiting on the follow tool 7, the cross braces 12-1-1 are connected with a positioner 10 through connecting seats 12-1-4, the bottoms of the connecting seats 12-1-4 are provided with lower supporting seats 12-1-6, and the lower supporting seats 12-1-6 form lower limiting on the follow tool 7; the longitudinal support 12-1-2 is provided with a bottom carriage jacking cylinder 12-2, the jacking cylinder 12-2 directly acts on a main longitudinal beam of the framework to limit the upper part of the framework monomer, the extending end of the bottom carriage jacking cylinder 12-2 can be selected to be connected with a cross beam 12-3 aiming at the bottom plate, and jacking supports 12-4 are uniformly distributed on the cross beam 12-3 along the length direction to limit the upper part of the bottom plate 9 monomer. The framework welding tool 12 and the bottom chamber welding tool 12 are also provided with a water-cooling welding system, the provided arc welding software package meets the functional requirements of contact sensing, arc tracking, multi-layer and multi-channel and the like, and the repetition precision of the robot is +/-0.1 mm. The work station area is provided with grating sensing hardware, personnel and materials enter the sensing area, and the equipment stops running immediately; each scram signal of the robot workstation is connected to the PLC, and effective response can be achieved at the first time.

An upper support 12-1-5 is arranged on the upper portion of the connecting seat 12-1-4, the upper support 12-1-5 is connected with the longitudinal support 12-1-2, a taper pin is arranged in the middle of the lower support 12-1-6 and matched with a taper pin sleeve at the bottom of the transverse support 12-1-17-1 of the follow-up fixture 7, so that the effect of positioning the follow-up fixture 7 is achieved, and cushion blocks are arranged on two sides of the taper pin. When the follow tool 7 is transported to the position of the welding tool 12, the electric sensor is used for sensing and positioning, the welding tool 12 descends along with the positioner 10, and the follow tool 7 is opened to push against the air cylinder 12-1-3.

For the framework, firstly, a welding device 11 (a robot) positions the upper plane of a main longitudinal beam of the bottom compartment framework 8 from top to bottom; the robot accurately identifies the position of a welding seam through the welding wire locating function, and firstly welds a vertical welding seam and a flat welding seam on an upper plane of the bottom compartment framework 8; after the vertical welding line of the bottom carriage framework 8 and the flat welding line of the upper plane are welded, the lifting type double-column single-shaft welding positioner 10 positions the follow-up tool 7, the follow-up tool 7 is lifted from bottom to top, the follow-up tool 7 is separated from the follow-up tool clamping part 3-2, the follow-up tool clamping part 3-2 returns to the bottom carriage framework butt joint station 1 along with the RGV vehicle A1-1, and the welding tool 12 jacks the upper plane of the main longitudinal beam of the bottom carriage framework 9 from top to bottom for a second time, so that the effects of rigid fixation and welding deformation control are achieved. The welding robot is turned over 180 degrees along with the lifting type double-upright single-shaft welding positioner 10, the position of a welding seam is accurately identified through a welding wire locating function, and flat welding seam welding of the lower plane of the bottom box framework 8 is carried out; after the flat welding seam on the lower plane of the bottom box framework 8 is welded, the lifting type double-upright-post single-shaft welding positioner 10 is turned over by 180 degrees.

For the bottom plate, firstly, a welding device 11 (a robot) positions the bottom plate 9 of the bottom carriage from top to bottom, and the distance between the welding device and the splicing welding seam is 50mm; the robot accurately identifies the position of a welding line through a laser locating function, and firstly welds a plane splicing welding line on the stainless steel bottom plate 9; after the plane splicing welding seam on the stainless steel bottom plate 9 is welded, the lifting type double-column single-shaft welding positioner 10 positions the following tool 7, the following tool 7 is lifted from bottom to top, the following tool 7 is separated from a following tool clamping part 3-2, the following tool clamping part 3-2 returns to a bottom carriage bottom plate butt joint station 3 along with an RGV vehicle B3-1, the welding tool 12 tightly jacks the upper plane of the bottom carriage bottom plate 9 from top to bottom for two times, and the bottom plate 9 is tightly jacked by a large area, so that the effects of rigid fixation and welding deformation control are achieved. The welding robot is turned over 180 degrees along with the lifting type double-upright single-shaft welding positioner 10, accurately identifies the position of a welding line through a laser locating function, and performs welding on the connecting welding line of the bottom plate 9 and the framework 8; after the connecting welding seam of the bottom plate 9 and the bottom box framework 8 is welded, the lifting type double-upright-post single-shaft welding positioner 10 is turned over by 180 degrees.

The bottom carriage framework welding station 2 and the bottom carriage bottom plate welding station 4 both comprise a gantry type sliding table frame 13 arranged above the welding fixing device 12-1, seven welding robots are arranged on the gantry type sliding table frame 13 in a sliding mode, and the seven welding robots integrate a welding wire locating function; the positioner 10 is a lifting double-upright single-shaft welding positioner 10;

the bottom box framework docking station 1 further comprises framework hoisting equipment 14 for loading materials and a welding machine cantilever wire feeding device;

the bottom compartment floor docking station 3 further comprises a plate lifting device 14.

The pallet tooling 7 is of a frame structure consisting of pallet tooling cross braces 7-1 and pallet tooling longitudinal braces 7-2, the middle longitudinal braces 7-2 are uniformly arranged between the two side longitudinal braces 7-2, a gap is formed between every two adjacent pallet tooling longitudinal braces 7-2, and the bottom plate clamping part 7-3 is arranged on the pallet tooling 7 longitudinal braces 7-2;

the bottom plate clamping part 7-3 consists of at least two bottom plate clamping mechanisms, each bottom plate clamping mechanism comprises a bottom plate clamping base 7-3-1 fixed on the longitudinal support 7-2, a bottom plate clamping supporting seat 7-3-2 is fixed on the upper surface of the bottom plate clamping base 7-3-1, a U-shaped block 7-3-3 is fixed on the upper surface of the bottom plate clamping supporting seat 7-3-2, the U-shaped block 7-3-3 is positioned with a framework 8 monomer, and a bottom box clamp 7-3-4 is arranged above the U-shaped block 7-3-3 to fix a bottom box.

The framework butt joint tool 1-2 comprises a framework butt joint base fixed on the top of the RGV A1-1, and mounting holes are uniformly distributed in the top of the framework butt joint base; and positioning the framework clamping units at different positions according to the mounting holes at different positions and the production of bottom compartments of different models.

The framework clamping part 1-3 consists of at least one framework clamping monomer, and the framework clamping monomer is fixed in the mounting hole; the framework clamping monomer comprises a framework clamping support 1-3-1, a framework clamping fixing block 1-3-5 is arranged on the upper portion of the framework clamping support 1-3-1, a framework clamping cylinder 1-3-3 is arranged on the side wall of the framework clamping support 1-3-1, a framework clamping jacking block 1-3-4 is fixed at the movable end of the framework clamping cylinder 1-3-3, and the framework clamping cylinder 1-3-3 adjusts the distance between the framework clamping jacking block 1-3-4 and the framework clamping fixing block 1-3-5.

The bottom carriage bottom plate welding station 4 further comprises an RGV vehicle C15, and the RGV vehicle C15 reciprocates between the bottom carriage bottom plate welding station 4 and the accessory welding and quality inspection station 5.

The invention also discloses a bottom compartment welding process, which comprises the following steps:

the method comprises the following steps: positioning and clamping the single framework 8, and arranging a follow-up tool 7 for ejecting the welded framework 8 below the framework 8;

step two: the upper plane of the framework 8 is positioned by welding wires for welding, after welding, the framework 8 and the following tool 7 are compressed and turned, and the lower plane of the framework 8 is positioned by welding wires for welding;

step three: positioning and clamping the base plate 9 monomers, and performing spot welding fixation between the two base plate 9 monomers;

step four: the upper plane of the bottom plate 9 is positioned by laser to be welded, after welding, the bottom plate 9, the framework 8 and the following tool 7 are compressed and turned, and the lower plane of the bottom plate 9 is positioned by laser to be welded;

step five: turning the welded bottom box 180 degrees to enable the framework 8 to face upwards, and welding accessories;

step six: and (5) checking the overall quality of the bottom compartment, and storing the bottom compartment to a bottom compartment caching station 6 after the bottom compartment is inspected and rechecked to be qualified.

In the process from the first step to the second step, the positioned single framework 8 and the following tool 7 are transported to a bottom compartment framework welding station 2 by an RGV vehicle A1-1;

in the process from the second step to the third step, and from the third step to the fourth step, the welded framework 8 and the following tool 7 are transported to the bottom carriage bottom plate butt joint station 3 through the RGV vehicle B3-1, and the positioned bottom plate 9, the framework 8 and the following tool 7 are transported to the bottom carriage bottom plate welding station 4.

In the sixth step, after the welded bottom carriage is placed at the bottom carriage cache station 6, the pallet tooling 7 is transported to the lower part of the single framework 8 needing to be positioned and clamped through the pallet tooling 7 lifting equipment 14.

Compared with the prior art, the invention has the advantages that 1, the butt joint direction of the framework 8 and the bottom plate 9 is adjusted, and the butt joint direction of the bottom plate is kept to be positioned at the upper side of the framework of the bottom compartment from the framework butt joint station 1, so that the follow-up tool is always kept to be positioned at the lower side of the framework to support the framework, and the bottom plate is conveniently hung and butted from top to bottom; (ii) a 2. The following tool 7 is used for fixing the bottom carriage, and the bottom carriage moves between stations along with the RGV, so that the bottom carriage is rigidly fixed, and welding deformation is controlled; 3. in the welding process, the following tool 7, the bottom compartment and the welding tool 12 are designed into a sandwich welding structure, the deformation generated in the welding of the bottom compartment is controlled, and the precision requirement of robot welding is met; 4. the stall-type production mode is eliminated, the robot automatic welding is realized, a traveling crane is not needed in material overturning, the positioner 10 is used for automatic overturning, and the production safety is improved.

The technical means disclosed in the scheme of the invention are not limited to the technical means disclosed in the above embodiments, but also include the technical means formed by any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and such improvements and modifications are also considered to be within the scope of the present invention.

Claims (4)

1. A bottom carriage welding tool is characterized by comprising a welding fixing device, wherein the welding fixing device comprises a limiting frame consisting of cross braces and longitudinal braces, the cross braces on two sides are provided with follow tools for tightly pushing a cylinder to form an upper limit for the follow tools, the cross braces are connected with a position changer through a connecting seat, the bottom of the connecting seat is provided with a lower support, and the lower support forms a lower limit for the follow tools; the longitudinal support is provided with a bottom compartment jacking cylinder, the extending end of the bottom compartment jacking cylinder is connected with a cross beam, and jacking supports are uniformly distributed on the cross beam along the length direction to form upper limit on the bottom plate monomer.

2. The bottom carriage welding tool according to claim 1, wherein the pallet is of a frame structure consisting of pallet cross braces and pallet longitudinal braces, the middle longitudinal braces are uniformly arranged between the two pallet longitudinal braces at two sides, a gap is formed between every two adjacent pallet longitudinal braces, and the bottom plate clamping part is arranged on the pallet longitudinal braces.

3. The bottom box welding tool according to claim 2, wherein the bottom plate clamping portion comprises at least two bottom plate clamping mechanisms, each bottom plate clamping mechanism comprises a bottom plate clamping base fixed on the longitudinal support, a bottom plate clamping support seat is fixed on the upper surface of each bottom plate clamping base, a U-shaped block is fixed on the upper surface of each bottom plate clamping support seat and is positioned with the framework single body, and a bottom box clamp is arranged above each U-shaped block to clamp the bottom box for fixing.

4. The bottom chamber welding tool as claimed in claim 3, wherein a taper pin is arranged at the top of the lower support, the taper pin is matched with a taper pin sleeve on the follow-up tool, and cushion blocks are arranged on two sides of the taper pin.

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