CN110227891A - Bottom frame spot-welding work station and bottom frame spot-welding system - Google Patents

Abstract

Embodiments of the present invention provide a chassis spot welding workstation and a chassis spot welding system, which relate to the field of automatic production equipment for automobiles. The underframe spot welding workstation includes a truss robot, a spot welding robot and a welding mechanism. The welding mechanism includes a track system and at least two manipulators. The at least two manipulators are arranged on the track system at intervals and can move relatively through the track system. The truss robot is arranged above the welding mechanism, and is used to grab the raw materials to be welded one by one to at least two manipulators or the raw materials to be welded fixed by the manipulators, and the manipulators are used to grab and fix the raw materials to be welded. The spot welding robot is set close to the welding mechanism and is used to weld adjacent raw materials to be welded. The manipulator is also used to lift the raw materials to be welded to the transportation line after welding. The underframe spot welding workstation can automatically grab the raw materials to be welded and complete the functions of welding and transmission, saving time and effort and high efficiency.

Description

Chassis spot welding workstation and chassis spot welding system

technical field

The invention relates to the field of automatic production equipment for automobiles, in particular to an underframe spot welding workstation and an underframe spot welding system.

Background technique

At this stage, the assembly and spot welding of small parts of the new energy bus chassis is carried out manually. Due to the complex structure of the product and the variety of models, the whole positioning tool needs to be replaced every time the model is changed, and dozens of square tubes need to be moved every time the on-site personnel assemble. After putting it into the predetermined position, switch to a welding torch to spot-weld the connection position of each square tube, and then manually carry it, which is time-consuming and laborious and the quality is unstable.

Contents of the invention

The object of the present invention includes providing an underframe spot welding workstation, which can automatically grab the raw materials to be welded and complete the functions of welding and conveying, saving time and labor, and high efficiency.

The object of the present invention also includes providing a base frame spot welding system, which adopts the base frame spot welding workstation provided by the present invention, which can automatically grab the raw materials to be welded and complete the functions of welding and transmission, saving time and effort, and high efficiency.

Embodiments of the present invention can be realized like this:

In the first aspect, an embodiment of the present invention provides a chassis spot welding workstation, including a truss robot, a spot welding robot, and a welding mechanism;

The welding mechanism includes a track system and at least two manipulators, at least two manipulators are arranged on the track system at intervals, and can move relatively through the track system; the truss robot is arranged on the welding mechanism above, and used to grab the materials to be welded one by one to at least two of the manipulators or the materials to be welded fixed by the manipulators, the manipulators are used to grab and fix the materials to be welded; The spot welding robot is arranged close to the welding mechanism, and is used for welding the adjacent raw materials to be welded, and the manipulator is also used to lift the raw materials to be welded to the transportation line after welding.

In an optional embodiment, the track system includes a first track, a first driving member and a second track; the first track is arranged along a first direction, the second track is arranged along a second direction, and The first track is slidingly fitted, and the first direction and the second direction form an angle; the first driving member is connected to the second track and is used to drive the second track along the first The direction slides relative to the first track, and a plurality of the manipulators are arranged at intervals on the second track.

In an optional embodiment, the track system further includes a plurality of second driving members, and the plurality of second driving members are arranged on the second track and are connected to the plurality of manipulators in one-to-one correspondence, Each of the second driving members is used to drive the corresponding manipulator to slide relative to the second track along the second direction.

In an optional embodiment, the number of the second track is multiple, and a plurality of the second tracks are arranged on the first track in parallel at intervals, and each of the second tracks is provided with at least two two manipulators, and at least two manipulators are used to cooperate with each other and fix the raw materials to be welded.

In an optional embodiment, the track system further includes a limit block, the limit block is arranged between two adjacent second rails, and the limit block is arranged on the first On the first track, limit the sliding distance of the second track.

In an optional embodiment, the track system includes a base frame and a connecting plate, the first track is fixed on the base frame, and at least one second track is fixed to the base frame through the connecting plate The number of the first driving member is multiple, and the multiple first driving members are set corresponding to the multiple second rails that slide relative to the first rail, and the rail system also includes a slide rail, The first driving part is slidingly matched with the slide rail, and the second track is arranged on the first driving part.

In an optional embodiment, the manipulator includes a lifting part and a grabbing part arranged on the lifting part, and the lifting part is arranged on the track system and is used to drive the grabbing part Close to or away from the track system, the grasping part is used to carry and fix the raw material to be welded.

In an optional embodiment, the lifting part includes a jacking part, and the grabbing part includes a bearing plate, a first clamping plate, a second clamping plate and a clamping driving part, and the jacking part and The clamping driving part is connected and used to drive the clamping driving part close to or away from the track system, the bearing plate and the first clamping plate are respectively fixed on the clamping driving part, the The second clamping plate is fixed on the carrier plate, and the first clamping plate and the second clamping plate are oppositely arranged to form a clamping opening, and the clamping driver is used to drive the first The clamping plate approaches or moves away from the second clamping plate, so as to adjust the size of the clamping opening, and clamp or release the material to be welded.

In an optional embodiment, a limiting guide groove is provided on the bearing plate, and the first clamping plate is slidably matched with the limiting guiding groove.

In the second aspect, an embodiment of the present invention provides an underframe spot welding system, including a silo and the underframe spot welding workstation according to any one of the foregoing embodiments, the silo is arranged under the truss robot, And set on one side of the welding mechanism.

The beneficial effects of the embodiments of the present invention include:

The underframe spot welding workstation provided by the embodiment of the present invention can grab the raw materials to be welded one by one by the truss robot to the manipulator, and grab and fix the raw materials to be welded by the manipulator. The manipulator can move relatively through the track system to adjust the The location of the welding raw materials, so that the raw materials that need to be welded are close to each other, and the welding preparation is done, and the chassis spot welding workstation provided by the embodiment of the present invention can also grab the raw materials to be welded by the truss robot according to the welding needs. On the fixed raw materials to be welded, prepare for welding, and then use the spot welding robot to weld the adjacent raw materials to be welded together. After the welding work is completed, the welded raw materials to be welded can be lifted to the transportation line by the robot. The underframe spot welding workstation can automatically grab the raw materials to be welded, and automatically complete the welding and transmission work, which saves time and effort, and has high efficiency.

The underframe spot welding system provided by the embodiment of the present invention, due to the use of the underframe spot welding workstation, can grab the raw materials to be welded one by one by the truss robot to the manipulator, and weld the adjacent raw materials to be welded by the spot welding robot Together, after the electric welding work is completed, the raw materials to be welded after welding can also be lifted to the transportation line by the manipulator. Therefore, the degree of automation is high, time and effort are saved, and the efficiency is high.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

Fig. 1 is a structural schematic diagram of a chassis spot welding system provided by a specific embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a chassis spot welding workstation provided by a specific embodiment of the present invention.

FIG. 3 is an enlarged view of A in FIG. 2 .

Fig. 4 is a structural schematic diagram of the mechanical arm of the truss robot of the underframe spot welding workstation provided by a specific embodiment of the present invention.

Fig. 5 is a structural schematic diagram of the welding mechanism of the underframe spot welding workstation provided by a specific embodiment of the present invention.

Fig. 6 is a structural schematic diagram of a manipulator of a chassis spot welding workstation provided by a specific embodiment of the present invention.

Icons: 200-underframe spot welding system; 210-material bin; 211-accommodating tank; 201-raw materials to be welded; 100-underframe spot welding workstation; 110-truss robot; 112-support; 113-running truss; 1131 - first guide; 1132 - second guide; 1133 - third guide; 1134 - first guide drive; 1135 - second guide drive; 1136 - third guide drive; 114 - mechanical arm; 1141 -installation plate; 1142-rotation drive; 1143-clamping structure; 1041-first splint; 1042-second splint; 1043-clamping drive; 1044-first hook; - second hook; 120 - spot welding robot; 130 - welding mechanism; 131 - track system; 1311 - chassis; 1312 - first track; 1313 - first drive; 1314 - second track; Two driving parts; 1316-connecting plate; 1317-connecting sheet metal; 1318-limiting block; 132-manipulator; 1321-lifting part; 1301-fixing plate; Loading plate; 1304-first clamping plate; 1305-second clamping plate; 1306-clamping driving member; 101-limiting guide groove.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.

Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that like numerals and letters denote similar items in the following figures, therefore, once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that if the orientation or positional relationship indicated by the terms "upper", "lower", "inner" and "outer" appear, it is based on the orientation or positional relationship shown in the drawings, or It is the orientation or positional relationship that the invention product is usually placed in use, and it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation , and therefore cannot be construed as a limitation of the present invention.

In addition, terms such as "first" and "second" are used only for distinguishing descriptions, and should not be understood as indicating or implying relative importance.

It should be noted that, in the case of no conflict, the features in the embodiments of the present invention may be combined with each other.

FIG. 1 is a schematic structural diagram of a chassis spot welding system 200 provided in this embodiment. Please refer to FIG. 1 , the present embodiment provides an underframe spot welding system 200 , which includes a feed bin 210 , an underframe spot welding workstation 100 and a transport line (not shown). Both the silo 210 and the transportation line are set close to the underframe spot welding workstation 100, the hopper 210 is used to store the raw materials 201 to be welded, and the transportation line is used to transport the products welded by the underframe spot welding workstation 100 out of the underframe spot welding workstation 100 . Optionally, in this embodiment, the raw material 201 to be welded can be a square tube, so multiple accommodating slots 211 that match the shape of the square tube and are easy to grab can be set on the silo 210 to accommodate different types of square tube.

FIG. 2 is a schematic structural diagram of the chassis spot welding workstation 100 provided in this embodiment. Please refer to FIG. 1 and FIG. 2 in conjunction. In this embodiment, the chassis spot welding workstation 100 includes a truss robot 110 , a spot welding robot 120 and a welding mechanism 130 . The truss robot 110 , the spot welding robot 120 and the welding mechanism 130 are arranged adjacent to each other at intervals, and are electrically connected or communicated with each other to facilitate control.

Among them, the truss robot 110 is used to grab the raw materials 201 to be welded from the silo 210 to the welding mechanism 130 one by one, or to grab the raw materials 201 to be welded that have been fixed on the welding mechanism 130 according to welding requirements, so as to make Good solder ready. The welding mechanism 130 is used to receive the material to be welded 201 grabbed by the truss robot 110 and fix the material to be welded 201 , and is also used to adjust the position of the material to be welded 201 to meet different welding requirements. The spot welding robot 120 is used to weld two or more adjacent raw materials 201 to be welded. When the welding of the raw materials 201 to be welded is completed to form a product, the welding mechanism 130 is also used to lift the product to the transportation line.

FIG. 3 is an enlarged view of A in FIG. 2 . Please refer to FIG. 2 and FIG. 3 in conjunction. In this embodiment, the truss robot 110 includes a support 112 , a running truss 113 and a mechanical arm 114 . The running truss 113 is arranged on the support 112, and the mechanical arm 114 is installed on the running truss 113, so that the mechanical arm 114 is arranged above the material bin 210 and the welding mechanism 130, which is convenient for taking and discharging materials. The robotic arm 114 can move in multiple directions on the running truss 113 .

Optionally, there are two brackets 112, which are relatively parallel. The running truss 113 includes a first guide 1131 respectively arranged at the top ends of the two supports 112 , a second guide 1132 connected between the two first guides 1131 , and a third guide 1132 slidably connected to the second guide 1132 Item 1133. In this embodiment, the first guide 1131 , the second guide 1132 and the third guide 1133 are vertically arranged in pairs.

In this embodiment, the running truss 113 also includes a first guide driver 1134, a second guide driver 1135 and a third guide driver 1136, wherein the first guide driver 1134 is arranged on the first guide 1131 and is used for Drive the second guide 1132 to slide along the extension direction of the first guide 1131, the second guide driver 1135 is arranged on the second guide 1132, and is used to drive the third guide 1133 to slide along the extension direction of the second guide 1132 , the third guide driver 1136 is disposed on the third guide 1133 and used to drive the mechanical arm 114 to slide along the extension direction of the third guide 1133 .

It should be noted that, in this embodiment, the first guiding driving member 1134 , the second guiding driving member 1135 and the third guiding driving member 1136 can all use linear motors.

FIG. 4 is a schematic structural diagram of the mechanical arm 114 of the truss robot 110 of the chassis spot welding workstation 100 provided in this embodiment. Please refer to Fig. 4 , in this embodiment, the mechanical arm 114 includes a mounting plate 1141, a rotating drive member 1142 and a clamping structure 1143. The holding structure 1143 is used to clamp the raw material 201 to be welded.

Optionally, the clamping structure 1143 includes a first clamping plate 1041, a second clamping plate 1042 and a clamping driver 1043, the first clamping plate 1041 is connected to the rotation driving member 1142, the clamping driver 1043 is installed on the first clamping plate 1041, and It is connected with the second clamping plate 1042 to drive the second clamping plate 1042 close to or away from the first clamping plate 1041 to realize clamping and releasing of the raw material 201 to be welded.

In order to ensure the stability of the clamping structure 1143, in this embodiment, the clamping structure 1143 also includes a first hook 1044 disposed on the side of the first clamping plate 1041 close to the second clamping plate 1042, a clamping driving member 1405 and a clamping driver 1405 disposed on the clamping plate 1041. Hold the second hook 1046 on the driver 1405, the first hook 1044 extends toward the second clamping plate 1042, and the clamping driver 1405 is used to drive the second hook 1046 to approach or move away from the first hook 1044, and the first clamping plate 1041 and the second splint 1042 cooperate to clamp the raw material 201 to be welded.

In this embodiment, the rotating driving part 1142 can be a motor, and both the clamping driving part 1043 and the clamping driving part 1405 can be air cylinders or hydraulic cylinders.

It can be understood that in this embodiment, the truss robot 110 can clamp or release the raw material 201 to be welded by cooperating with the first splint 1041, the second splint 1042, the first hook 1044 and the second hook 1046, and can run The truss 113 and the rotating driving part 1142 etc. realize multi-directional movement, which is convenient for clamping and releasing the raw material 201 to be welded.

FIG. 5 is a schematic structural diagram of the welding mechanism 130 of the chassis spot welding workstation 100 provided in this embodiment. Referring to FIG. 5 , in this embodiment, the welding mechanism 130 includes a track system 131 and at least two manipulators 132 , and at least two manipulators 132 are arranged on the track system 131 at intervals and can move relatively through the track system 131 .

Optionally, in this embodiment, the rail system 131 includes a chassis 1311 , a first rail 1312 , a first driving member 1313 , a second rail 1314 and a plurality of second driving members 1315 .

The first track 1312 is fixed on the base frame 1311 and arranged along a first direction, and the second track 1314 is arranged along a second direction and is slidably matched with the first track 1312 . The first driving member 1313 is connected to the second rail 1314 and is used to drive the second rail 1314 to slide relative to the first rail 1312 along the first direction, and a plurality of manipulators 132 are arranged on the second rail 1314 at intervals.

It should be understood that, in this embodiment, both the first driving member 1313 and the second driving member 1315 can be linear motors.

A plurality of second driving elements 1315 are arranged on the second track 1314, and are connected with the plurality of manipulators 132 in one-to-one correspondence, and each second driving element 1315 is used to drive the corresponding manipulator 132 to slide relative to the second track 1314 along the second direction .

The first direction forms an included angle with the second direction. Optionally, in this embodiment, the first direction and the second direction are perpendicular to each other.

Optionally, the number of second rails 1314 is set to be multiple, and multiple second rails 1314 are arranged on the first rail 1312 at intervals in parallel, and each second rail 1314 is provided with at least two manipulators 132, at least two The manipulator 132 is used to cooperate with each other and fix the raw material 201 to be welded.

It can be understood that two or more manipulators 132 arranged on the same second rail 1314 can cooperate with each other to stably hold a raw material 201 to be welded. Therefore, a plurality of second rails 1314 can be correspondingly provided with a plurality of parallel raw materials 201 to be welded. When multiple parallel raw materials 201 to be welded are fixed, the raw materials 201 to be welded that are at an angle to the extension direction of the fixed raw materials to be welded 201 can be picked up by the truss robot 110 or clamped on two fixed to be welded materials 201 On the raw material 201, prepare for welding.

Optionally, in this embodiment, there are two first rails 1312 and three second rails 1314, and the three second rails 1314 are arranged on the two first rails 1312 across the interval, and each The second track 1314 is provided with two manipulators 132, to complete the welding of the small parts of the bus chassis. It should be understood that in other optional embodiments, the number of the first track 1312 , the second track 1314 and the number of manipulators 132 may be set as required.

In this embodiment, in order to facilitate the sliding of the second rails 1314 , the rail system 131 further includes a connecting plate 1316 , and a plurality of second rails 1314 are fixed to the bottom frame 1311 through the connecting plates 1316 .

Optionally, the number of the first driving member 1313 is also set to multiple, and each first driving member 1313 corresponds to a two-track arrangement, and the track system 131 also includes a sliding rail, and the first driving member 1313 is slidably matched with the sliding rail , the second track 1314 is disposed on the first driving member 1313 .

Optionally, in this embodiment, the welding mechanism 130 further includes a connecting sheet metal 1317 . A second rail 1314 at the end is fixed on the bottom frame 1311 through a connecting sheet metal 1317 . Therefore, the second track 1314 may not be provided with the first driving member 1313 correspondingly. That is to say, in this embodiment, each first driving member 1313 is set corresponding to the second track 1314 sliding relative to the first track 1312 .

In order to limit the sliding distance of the second rail 1314, in this embodiment, the rail system 131 further includes a limit block 1318, and the limit block 1318 is arranged between two adjacent second rails 1314, and the limit block 1318 is arranged on on the first rail 1312, thereby limiting the sliding distance of the second rail 1314.

FIG. 6 is a schematic structural diagram of the manipulator 132 of the chassis spot welding workstation 100 provided in this embodiment. Please refer to FIG. 6 , in this embodiment, the manipulator 132 includes a lifting part 1321 and a grasping part 1322 arranged on the lifting part 1321. The lifting part 1321 is arranged on the rail system 131 and is used to drive the grasping part 1322 close to Or away from the track system 131 , the grasping part 1322 is used to carry and fix the raw material 201 to be welded.

Optionally, in this embodiment, the lifting part 1321 includes a fixing plate 1301 and a lifting piece 1302, the fixing plate 1301 is used to be fixed on the chassis 1311, and the lifting piece 1302 is installed on the fixing plate 1301, and is used for grasping The picking part 1322 is connected to drive the grabbing part 1322 to move up and down, so as to realize the lifting of the welded product.

Optionally, the grasping part 1322 includes a carrying plate 1303 , a first clamping plate 1304 , a second clamping plate 1305 and a clamping driving member 1306 .

In this embodiment, the jacking member 1302 is connected to the clamping driver 1306, and is used to drive the clamping driver 1306 close to or away from the track system 131, and the carrying plate 1303 and the first clamping plate 1304 are respectively fixed on the clamping driver 1306 On the top, the second clamping plate 1305 is fixed on the carrier plate 1303, and the first clamping plate 1304 and the second clamping plate 1305 are oppositely arranged to form a clamping opening, and the clamping driver 1306 is used to drive the first clamping plate 1304 approaches or moves away from the second clamping plate 1305 to adjust the size of the clamping opening, clamping or releasing the material 201 to be welded.

It can be understood that, in this embodiment, both the jacking member 1302 and the clamping driving member 1306 can be hydraulic cylinders or air cylinders.

In order to ensure the stability of the grasping structure of the manipulator 132 , in this embodiment, a limiting guide groove 101 is provided on the bearing plate 1303 , and the first clamping plate 1304 is slidingly matched with the limiting guiding groove 101 .

Please continue to refer to FIG. 1 and FIG. 2 , when the underframe spot welding system 200 provided in this embodiment is used, the first guide driver 1134 , the second guide driver 1135 , the third guide driver 1136 , and the rotation driver 1142 And the driving action of the clamping driver 1043, and through the cooperation of the first splint 1041, the second splint 1042, the first hook 1044 and the second hook 1046, grab the raw material 201 to be welded from the silo 210 one by one to each The manipulator 132 on the second track 1314 clamps the raw material 201 to be welded by the driving action of the clamping driver 1306 and the mutual cooperation of the first clamping plate 1304 and the second clamping plate 1305. Then, the truss robot 110 can further grab the raw materials 201 to be welded from the silo 210 in the same manner and clamp them between the two fixed raw materials 201 to be welded to form a stable structure. After all the raw materials 201 to be welded that need to be welded are arranged in the above manner, the spot welding robot 120 can be started to respectively weld the adjacent raw materials 201 to be welded together to complete the welding. After the welding is completed, the product can also be lifted to the transportation line under the driving action of the jacking member 1302 .

To sum up, the underframe spot welding workstation 100 provided in this embodiment can automatically grab the raw material 201 to be welded, and automatically complete the welding and transmission work, saving time and labor, and has high efficiency.

The underframe spot welding system 200 provided in this embodiment, due to the use of the underframe spot welding workstation 100, can use the truss robot 110 to grab the raw materials 201 to be welded on the manipulator 132 one by one, and use the spot welding robot 120 to place adjacent The raw materials 201 to be welded are welded together, and after the electric welding work is completed, the welded raw materials 201 to be welded can also be lifted to the transportation line by the manipulator 132 . Therefore, the degree of automation is high, time and effort are saved, and the efficiency is high.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (10)

1. An underframe spot welding workstation is characterized in that it comprises a truss robot, a spot welding robot and a welding mechanism; The welding mechanism includes a track system and at least two manipulators, at least two manipulators are arranged on the track system at intervals, and can move relatively through the track system; the truss robot is arranged on the welding mechanism above, and used to grab the materials to be welded one by one to at least two of the manipulators or the materials to be welded fixed by the manipulators, the manipulators are used to grab and fix the materials to be welded; The spot welding robot is arranged close to the welding mechanism, and is used for welding the adjacent raw materials to be welded, and the manipulator is also used to lift the raw materials to be welded to the transportation line after welding. 2. The underframe spot welding workstation as claimed in claim 1, wherein the track system comprises a first track, a first driver and a second track; the first track is arranged along a first direction, and the The second track is arranged along the second direction, and is slidably matched with the first track, and the first direction forms an angle with the second direction; the first driving member is connected with the second track, and is used for The second rail is driven to slide relative to the first rail along the first direction, and a plurality of manipulators are arranged on the second rail at intervals. 3. The underframe spot welding workstation according to claim 2, wherein the track system further comprises a plurality of second drivers, a plurality of the second drivers are arranged on the second track, and The plurality of manipulators are connected in one-to-one correspondence, and each of the second driving members is used to drive the corresponding manipulator to slide relative to the second track along the second direction. 4. The underframe spot welding workstation as claimed in claim 3, wherein the number of the second rails is multiple, and a plurality of the second rails are arranged on the first rails in parallel at intervals, each At least two of the manipulators are arranged on each of the second rails, and at least two of the manipulators are used to cooperate with each other and fix the raw materials to be welded. 5. The underframe spot welding workstation according to claim 4, wherein the track system further comprises a limit block, and the limit block is arranged between two adjacent second tracks, And the limiting block is arranged on the first track to limit the sliding distance of the second track. 6. The underframe spot welding workstation as claimed in claim 4, wherein the rail system comprises an underframe and a connecting plate, the first rail is fixed on the underframe, and at least one of the second rails The connecting plate is fixed to the bottom frame; the number of the first driving parts is multiple, and the multiple first driving parts are set corresponding to the multiple second rails that slide relative to the first rails, Moreover, the track system further includes a sliding rail, the first driving part is slidingly matched with the sliding rail, and the second rail is arranged on the first driving part. 7. The underframe spot welding workstation according to claim 1, wherein the manipulator comprises a lifting part and a grasping part arranged on the lifting part, and the lifting part is arranged on the track system, and is used to drive the grabbing part close to or away from the track system, and the grabbing part is used to carry and fix the raw materials to be welded. 8. The underframe spot welding workstation according to claim 7, wherein the lifting part comprises a jacking part, and the grasping part comprises a bearing plate, a first clamping plate, a second clamping plate and a clamping driving member, the jacking member is connected with the clamping driving member, and is used to drive the clamping driving member close to or away from the track system, and the carrying plate and the first clamping plate are respectively fixed On the clamping driver, the second clamping plate is fixed on the bearing plate, and the first clamping plate and the second clamping plate are oppositely arranged to form a clamping opening, the The clamping driver is used to drive the first clamping plate close to or away from the second clamping plate, so as to adjust the size of the clamping opening, and clamp or release the material to be welded. 9 . The underframe spot welding workstation according to claim 8 , wherein a limiting guide groove is provided on the bearing plate, and the first clamping plate is slidably matched with the limiting guiding groove. 10 . 10. An underframe spot welding system, characterized in that it comprises a silo and the underframe spot welding workstation according to any one of claims 1-9, the silo is arranged below the truss robot, and It is arranged on one side of the welding mechanism.