CN220943652U - Spot welding device with movable bearing trolley - Google Patents

Abstract

The utility model relates to a spot welding device with a movable carrying trolley, which comprises a main body machine table, a spot welding unit and a movable carrying trolley, wherein the spot welding unit is arranged on the main body machine table, the movable carrying trolley can move relative to the main body machine table and is used for loading products, the main body machine table is provided with an avoidance space, the movable carrying trolley can be embedded into the avoidance space, and the output end of the spot welding unit faces the avoidance space and can perform spot welding operation on the products loaded on the movable carrying trolley which are arranged in the avoidance space. The utility model provides a spot welding device with a movable carrying trolley, which provides an effective solution for the spot welding operation problem of large and heavy products such as power batteries, and improves the production efficiency, the flexibility, the automation degree, the safety and the maintenance convenience through the application of the movable carrying trolley.

Description

Spot welding device with movable bearing trolley

Technical Field

The utility model relates to the field of cell spot welding, in particular to a spot welding device with a movable carrying trolley.

Background

When a conventional spot welding device performs spot welding operation on large and heavy products such as power batteries, the efficiency is often low due to the fact that a manipulator is difficult to perform a transport task. The manipulator is easy to be limited by the shape, the size and the weight of the object in the carrying process, and quick and accurate carrying is difficult to realize. Furthermore, the use of the robot arm also requires a significant amount of maintenance costs and time, as calibration and maintenance are required on a regular basis. Therefore, the design and manner of use of conventional spot welding devices is difficult to meet the needs of efficient and accurate spot welding operations, particularly for handling and spot welding operations of large, heavy products, requiring further improvements and optimization.

Disclosure of utility model

In view of the above, the utility model provides a spot welding device with a movable carrying trolley, which provides an effective solution for the spot welding operation problem of large and heavy products such as power batteries, and improves the production efficiency, flexibility, automation degree, safety and maintenance convenience through the application of the movable carrying trolley.

The aim of the utility model is achieved by the following technical scheme:

The utility model provides a spot welding device with portable carrier trolley, includes main part board, sets up the spot welding unit on the main part board, can remove and be used for loading the portable carrier trolley of product for the main part board, the main part board is provided with dodges the space, portable carrier trolley can imbed and dodge in the space, the output of spot welding unit is dodged the space and can be placed and dodge the product of carrying on the portable carrier trolley in the space and carry out spot welding operation.

The spot welding device with the movable carrying trolley provides an effective solution for the spot welding operation difficult problem of large and heavy products such as power batteries, and improves the production efficiency, the flexibility, the automation degree, the safety and the maintenance convenience through the application of the movable carrying trolley. The design of the mobile load-bearing trolley enables spot welding operation of large and heavy products such as power batteries, and for some products to be spot welded which are large and heavy, the traditional manipulator can be difficult to effectively carry and operate, and the spot welding device with the mobile load-bearing trolley can easily cope with the products. The movable bearing trolley is designed to enable the layout of the production line to be more flexible, and when the production line needs to be adjusted or the production flow needs to be changed, the movable characteristic of the movable bearing trolley enables adjustment to be simple, so that the adaptability of the production line is improved. The spot welding device with the movable carrying trolley combines the spot welding unit and the movable carrying trolley, has higher automation degree, can automatically load products through a preset program, and performs spot welding operation on the main machine, thereby not only reducing manual intervention, but also improving production efficiency. Meanwhile, the preset avoiding space can avoid the damage to the product in the spot welding process, and the safety of spot welding operation is ensured. The spot welding device with the movable carrying trolley adopts a modularized design, so that maintenance work is simplified. When the fault occurs, the device can be quickly replaced or maintained, the downtime of the device is reduced, and the usability of the device is improved.

Preferably, the movable bearing trolley is provided with an alignment wheel, and the main body machine table is provided with an alignment sleeve matched with the alignment roller.

The matching design of the alignment wheel and the alignment sleeve improves the alignment precision of the movable bearing trolley on the main body machine table, ensures the precision of spot welding operation, reduces the abrasion between the movable bearing trolley and the main body machine table, and prolongs the service life of the equipment.

Preferably, the movable bearing trolley comprises a frame, a lifting mechanism arranged on the frame, a bearing plate pushed to lift by the lifting mechanism, and a product positioning jig arranged on the bearing plate, wherein the product is clamped on the product positioning jig.

The application of the lifting mechanism enables the bearing plate to be lifted along with the movement of the movable bearing trolley, and the operation flow is simplified. When the product is aligned, the bearing plate can be quickly lifted to a proper position, so that the production efficiency is improved. The design of the product positioning jig enables the product to be accurately positioned and clamped, so that the processing quality and the processing precision of the product are guaranteed. The product positioning jig can be adjusted and replaced according to different product types and sizes, and has wide application range and flexibility.

Preferably, the main body machine table is provided with a first limit bar and a second limit bar, the first limit bar is connected with a first limit roller, the second limit bar is connected with a second limit roller, and the distance between the first limit bar and the second limit bar is equal to the width of the frame.

The movable bearing trolley can enter the avoidance space along the appointed direction by the aid of the first limiting strips and the second limiting strips, other parts are prevented from being collided when the movable bearing trolley moves, equipment damage is avoided, and production cost is increased. Meanwhile, the stability of the movable bearing trolley on the main body machine table is improved due to the cooperation of the limiting strips and the limiting rollers, and the production efficiency and the product quality are further improved.

Preferably, the main body machine is provided with a first bearing table and a second bearing table, and two sides of the bearing plate can be respectively pressed on the first bearing table and the second bearing table.

Through setting up first plummer and second plummer, can be with the loading board steady support on two mesa, increased the stability of loading board, avoided the product machining error that leads to because of the loading board is unstable. The design of the two bearing tables enables the supports on the two sides of the bearing plate to be independently adjusted, and the adjustment can be carried out according to different product requirements and processing requirements, so that the adaptability and the flexibility of the device are improved.

Preferably, the lifting mechanism comprises a hand rotating wheel, a transmission shaft in transmission connection with the hand rotating wheel and a screw nut component in transmission connection with the transmission shaft.

The design of the hand rotating wheel makes the operation of the lifting mechanism simple and convenient, and the lifting of the whole device can be controlled easily through the hand rotating wheel, so that the labor intensity and the operation difficulty are reduced. Through the design of screw nut subassembly, can realize elevating system's altitude mixture control to change the height of loading board, make the loading board can press at first plummer and second plummer, realize the stability of loading board, make the product keep stable in spot welding operation.

Preferably, the transmission shaft comprises a first reversing box connected with the hand rotating wheel, a first shaft connected with the first reversing box, a second reversing box connected with the first shaft, a second shaft connected with the second reversing box and forming a 90-degree included angle with the first shaft, a third shaft connected with the first reversing box and forming a 180-degree included angle with the first shaft, a third reversing box connected with the third shaft, and a fourth shaft connected with the third reversing box and forming a 90-degree included angle with the third shaft, wherein a plurality of screw nut assemblies are arranged and uniformly distributed on the second shaft and the fourth shaft.

The design of the transmission shaft comprises a plurality of reversing boxes and shafts, and the reasonable layout of the parts enables the whole lifting mechanism to be compact in structure and small in occupied space, and is beneficial to miniaturization and portability of the device. Through multistage switching-over and multiaxis transmission's design, can realize elevating system's steady operation, reduced friction and the energy consumption of device simultaneously, improved transmission efficiency, prolonged the life of device. The design of uniform distribution of the screw nut assemblies ensures that each part is stressed uniformly, local overload and damage are not easy to occur, and long-term stable operation of the device is facilitated. Meanwhile, the design is convenient for maintenance and replacement of damaged parts, and the maintenance cost is reduced.

Preferably, the screw nut assembly comprises a nut seat and a screw, the nut seat is in transmission connection with the transmission shaft, the top of the screw is connected with an end seat, and the end seat is arranged at the bottom of the bearing plate.

The structural stability of the whole device is improved due to the connection design of the nut seat and the transmission shaft, so that the device is stable in the operation process, and unnecessary vibration and error are avoided. The top of screw rod is connected with the end seat, and the end seat is installed in the bottom of loading board, and this kind of design makes maintenance and change part more convenient, has reduced maintenance cost.

Preferably, the product positioning jig comprises a jig table, a transverse baffle plate arranged on the jig table, a transverse movable plate matched with the transverse baffle plate, a transverse screw nut for driving the transverse movable plate to be close to or far away from the transverse baffle plate, a longitudinal baffle plate arranged on the jig table, a longitudinal movable plate matched with the longitudinal baffle plate, and a longitudinal screw nut for driving the longitudinal movable plate to be close to or far away from the longitudinal baffle plate.

The design of the product positioning jig comprises a jig table, a transverse baffle, a transverse movable plate, a transverse screw nut and other components, and the matching of the components enables the product to be accurately positioned and clamped, so that the processing precision and quality of the product are improved. The design of the components such as the jig table, the transverse baffle plate, the transverse movable plate, the transverse screw nut and the like enables the product positioning jig to be adjusted and replaced according to different product types and sizes, and the application range and flexibility of the device are increased.

Preferably, the bottom of the frame is provided with casters.

The bottom of the frame is provided with the truckles, so that the whole device can easily move on the main machine, the processing and the operation of products are convenient, and the production efficiency is improved. The arrangement of the casters can also ensure the stability and safety of the device in the moving process, and avoid unnecessary accidents and damages.

Compared with the prior art, the utility model has the beneficial effects that:

The spot welding device with the movable carrying trolley, provided by the utility model, provides an effective solution for the spot welding operation difficult problem of large and heavy products such as power batteries, and improves the production efficiency, flexibility, automation degree, safety and maintenance convenience through the application of the movable carrying trolley. The design of the mobile load-bearing trolley enables spot welding operation of large and heavy products such as power batteries, and for some products to be spot welded which are large and heavy, the traditional manipulator can be difficult to effectively carry and operate, and the spot welding device with the mobile load-bearing trolley can easily cope with the products. The movable bearing trolley is designed to enable the layout of the production line to be more flexible, and when the production line needs to be adjusted or the production flow needs to be changed, the movable characteristic of the movable bearing trolley enables adjustment to be simple, so that the adaptability of the production line is improved. The spot welding device with the movable carrying trolley combines the spot welding unit and the movable carrying trolley, has higher automation degree, can automatically load products through a preset program, and performs spot welding operation on the main machine, thereby not only reducing manual intervention, but also improving production efficiency. Meanwhile, the preset avoiding space can avoid the damage to the product in the spot welding process, and the safety of spot welding operation is ensured. The spot welding device with the movable carrying trolley adopts a modularized design, so that maintenance work is simplified. When the fault occurs, the device can be quickly replaced or maintained, the downtime of the device is reduced, and the usability of the device is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a block diagram of a spot welding apparatus having a movable carrier vehicle according to an embodiment of the present utility model.

Fig. 2 is a partial structural view of a spot welding apparatus having a movable carrier vehicle according to an embodiment of the present utility model.

Fig. 3 is a block diagram of a mobile load-bearing cart according to an embodiment of the utility model.

Fig. 4 is a block diagram of another view of a mobile load-bearing cart in accordance with an embodiment of the present utility model.

Fig. 5 is a structural diagram of a lifting mechanism according to an embodiment of the present utility model.

Fig. 6 is a block diagram of a product positioning jig according to an embodiment of the utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "left", "right", "vertical", "horizontal", etc. indicate orientations or positional relationships based on those shown in the drawings, or orientations or positional relationships that are conventionally put in use of the product of the application, or orientations or positional relationships that are conventionally understood by those skilled in the art, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

The technical scheme of the application will be described below with reference to the accompanying drawings.

The embodiment provides a spot welding device with movable carrying trolley, including main body machine 100, set up the spot welding unit 200 on main body machine 100, can be for main body machine 100 removal and be used for loading the portable carrying trolley 300 of product, main body machine 100 is provided with dodges space 110, and portable carrying trolley 300 can imbed and dodge in space 110, and the output of spot welding unit 200 is towards dodging space 110 and can be placed and dodge the product of carrying on the portable carrying trolley 300 of space 110 and carry out spot welding operation.

The spot welding device with the movable carrying trolley provides an effective solution to the spot welding operation problem of large and heavy products such as power batteries, and improves the production efficiency, flexibility, automation degree, safety and maintenance convenience through the application of the movable carrying trolley 300. The design of the mobile carrier 300 enables spot welding of large, heavy products such as power cells, which may be difficult to handle and operate effectively with conventional manipulators for some bulky, heavy products to be spot welded, which spot welding apparatus with mobile carrier is easy to handle. The movable loading trolley 300 is designed to enable the layout of the production line to be more flexible, and when the production line needs to be adjusted or the production flow needs to be changed, the movable loading trolley 300 is characterized in that the adjustment work is simplified, so that the adaptability of the production line is improved. The spot welding apparatus having the movable carrier vehicle combines the spot welding unit 200 and the movable carrier vehicle 300, has a high degree of automation, and the movable carrier vehicle 300 can automatically load a product through a preset program and perform a spot welding operation on the main body machine 100, which not only reduces manual intervention, but also improves production efficiency. Meanwhile, the preset avoiding space 110 can prevent the product from being damaged in the spot welding process, and the safety of spot welding operation is ensured. The spot welding device with the movable carrying trolley adopts a modularized design, so that maintenance work is simplified. When the fault occurs, the device can be quickly replaced or maintained, the downtime of the device is reduced, and the usability of the device is improved.

In this embodiment, the movable carriage 300 is provided with an alignment wheel 310, and the main machine 100 is provided with an alignment sleeve 120 matched with the alignment roller.

The matching design of the alignment wheel 310 and the alignment sleeve 120 improves the alignment precision of the movable carrying trolley 300 on the main body machine 100, ensures the precision of spot welding operation, reduces the abrasion between the movable carrying trolley 300 and the main body machine 100, and prolongs the service life of equipment.

In this embodiment, the movable carriage 300 includes a frame 320, a lifting mechanism 330 disposed on the frame 320, a carrying plate 340 pushed to lift by the lifting mechanism 330, and a product positioning jig 350 disposed on the carrying plate 340, where the product is clamped on the product positioning jig 350.

The use of the lifting mechanism 330 allows the carrier 340 to be lifted and lowered with the movement of the movable carriage 300, simplifying the operational procedure. When the products are aligned, the carrying plate 340 can be quickly lifted to a proper position, so that the production efficiency is improved. The design of the product positioning jig 350 enables the product to be accurately positioned and clamped, thereby ensuring the processing quality and precision of the product. The product positioning jig 350 can be adjusted and replaced according to different product types and sizes, and has a wide application range and flexibility.

In this embodiment, the main body machine 100 is provided with a first limiting bar 130 and a second limiting bar 140, the first limiting bar 130 is connected with a first limiting roller 131, the second limiting bar 140 is connected with a second limiting roller, and the distance between the first limiting bar 130 and the second limiting bar 140 is equal to the width of the frame 320.

The arrangement of the first limit bar 130 and the second limit bar 140 enables the movable carrying trolley 300 to enter the avoidance space 110 along the appointed direction, so that the movable carrying trolley 300 is prevented from colliding with other components during movement, equipment damage is avoided, and production cost is increased. Meanwhile, the stability of the movable carrying trolley 300 on the main body machine 100 is improved by matching the limiting strips and the limiting rollers, and the production efficiency and the product quality are further improved.

In this embodiment, the main body machine 100 is provided with a first bearing table 150 and a second bearing table 160, and two sides of the bearing plate 340 can be pressed against the first bearing table 150 and the second bearing table 160 respectively.

By providing the first and second loading tables 150 and 160, the loading plate 340 can be stably supported on two tables, the stability of the loading plate 340 is increased, and the product processing error caused by the instability of the loading plate 340 is avoided. The design of the two bearing tables enables the supports on the two sides of the bearing plate 340 to be independently adjusted, and the adjustment can be carried out according to different product requirements and processing requirements, so that the adaptability and the flexibility of the device are improved.

In this embodiment, the lifting mechanism 330 includes a hand wheel 331, a transmission shaft 332 drivingly connected to the hand wheel 331, and a screw nut assembly 333 drivingly connected to the transmission shaft 332.

The design of the hand rotating wheel 331 makes the operation of the lifting mechanism 330 simple and convenient, and the lifting of the whole device can be easily controlled through the hand rotating wheel 331, so that the labor intensity and the operation difficulty are reduced. Through the design of screw nut subassembly 333, can realize elevating system 330's altitude mixture control to change the height of loading board 340, make loading board 340 can press at first loading board 150 and second loading board 160, realize the stability of loading board 340, make the product keep stable in spot welding operation.

In this embodiment, the transmission shaft 332 includes a first reversing box 3321 connected to the hand-turning wheel 331, a first shaft 3322 connected to the first reversing box 3321, a second reversing box 3323 connected to the first shaft 3322, a second shaft 3324 connected to the second reversing box 3323 and forming a 90 degree angle with the first shaft 3322, a third shaft 3325 connected to the first reversing box 3321 and forming a 180 degree angle with the first shaft 3322, a third reversing box 3326 connected to the third shaft 3325, and a fourth shaft 3327 connected to the third reversing box 3326 and forming a 90 degree angle with the third shaft 3325, wherein a plurality of screw nut assemblies 333 are provided, and the plurality of screw nut assemblies 333 are uniformly distributed on the second shaft 3324 and the fourth shaft 3327.

The design of the drive shaft 332 includes a plurality of reversing boxes and shafts, and the reasonable layout of the components enables the whole lifting mechanism 330 to be compact in structure, small in occupied space and beneficial to miniaturization and portability of the device. Through the design of multistage reversing and multi-shaft transmission, the stable operation of the lifting mechanism 330 can be realized, meanwhile, the friction and the energy consumption of the device are reduced, the transmission efficiency is improved, and the service life of the device is prolonged. The design of uniform distribution of the plurality of screw nut assemblies 333 makes each component stressed uniformly, so that local overload and damage are not easy to occur, and long-term stable operation of the device is facilitated. Meanwhile, the design is convenient for maintenance and replacement of damaged parts, and the maintenance cost is reduced.

In this embodiment, the screw nut assembly 333 includes a nut seat 3331 and a screw 3332, the nut seat 3331 is in driving connection with the transmission shaft 332, the top of the screw 3332 is connected with an end seat 3333, and the end seat 3333 is mounted at the bottom of the bearing plate 340.

The design of the connection between the nut seat 3331 and the transmission shaft 332 increases the structural stability of the whole device, so that the device is more stable in the operation process, and unnecessary vibration and error are avoided. The top of screw rod is connected with the end seat, and the end seat is installed in the bottom of loading board 340, and this kind of design makes maintenance and change parts more convenient, has reduced maintenance cost.

In this embodiment, the product positioning jig 350 includes a jig table 351, a transverse baffle 352 disposed on the jig table 351, a transverse movable plate 353 cooperating with the transverse baffle 352, a transverse screw nut 354 driving the transverse movable plate 353 to approach or separate from the transverse baffle 352, a longitudinal baffle 355 disposed on the jig table 351, a longitudinal movable plate 356 cooperating with the longitudinal baffle 355, and a longitudinal screw nut 357 driving the longitudinal movable plate 356 to approach or separate from the longitudinal baffle 355.

The design of the product positioning jig 350 comprises a jig table 351, a transverse baffle 352, a transverse movable plate 353, a transverse screw nut 354 and other components, and the cooperation of the components enables the product to be accurately positioned and clamped, so that the processing precision and quality of the product are improved. The design of the jig table 351, the transverse baffle 352, the transverse movable plate 353, the transverse screw nut 354 and other components enables the product positioning jig 350 to be adjusted and replaced according to different product types and sizes, and the application range and flexibility of the device are increased.

In this embodiment, casters 321 are provided at the bottom of the frame 320.

The bottom of the frame 320 is provided with the casters 321, so that the whole device can easily move on the main machine 100, the processing and operation of products are convenient, and the production efficiency is improved. The arrangement of the casters 321 also ensures stability and safety of the device during movement, avoiding unnecessary accidents and damages.

Compared with the prior art, the embodiment has the beneficial effects that:

The spot welding device with the movable carrying trolley of the embodiment provides an effective solution to the spot welding operation difficult problem of large and heavy products such as power batteries, and improves the production efficiency, the flexibility, the automation degree, the safety and the maintenance convenience through the application of the movable carrying trolley 300. The design of the mobile carrier 300 enables spot welding of large, heavy products such as power cells, which may be difficult to handle and operate effectively with conventional manipulators for some bulky, heavy products to be spot welded, which spot welding apparatus with mobile carrier is easy to handle. The movable loading trolley 300 is designed to enable the layout of the production line to be more flexible, and when the production line needs to be adjusted or the production flow needs to be changed, the movable loading trolley 300 is characterized in that the adjustment work is simplified, so that the adaptability of the production line is improved. The spot welding apparatus having the movable carrier vehicle combines the spot welding unit 200 and the movable carrier vehicle 300, has a high degree of automation, and the movable carrier vehicle 300 can automatically load a product through a preset program and perform a spot welding operation on the main body machine 100, which not only reduces manual intervention, but also improves production efficiency. Meanwhile, the preset avoiding space 110 can prevent the product from being damaged in the spot welding process, and the safety of spot welding operation is ensured. The spot welding device with the movable carrying trolley adopts a modularized design, so that maintenance work is simplified. When the fault occurs, the device can be quickly replaced or maintained, the downtime of the device is reduced, and the usability of the device is improved.

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

Claims (10)

1. The utility model provides a spot welding device with portable carrier trolley, its characterized in that, includes main part board, sets up the spot welding unit on the main part board, can remove and be used for loading the portable carrier trolley of product for the main part board, the main part board is provided with dodges the space, portable carrier trolley can imbed and dodge in the space, the output of spot welding unit is dodged the space and can be placed and dodge the product of carrying on the portable carrier trolley in the space and carry out spot welding operation.

2. The spot welding apparatus with a movable carrying trolley according to claim 1, wherein an alignment wheel is provided on the movable carrying trolley, and an alignment sleeve matched with the alignment roller is provided on the main body machine.

3. The spot welding device with the movable carrying trolley according to claim 1, wherein the movable carrying trolley comprises a frame, a lifting mechanism arranged on the frame, a carrying plate pushed to lift by the lifting mechanism, and a product positioning jig arranged on the carrying plate, and the product is clamped on the product positioning jig.

4. The spot welding device with the movable carrying trolley according to claim 3, wherein the main body machine table is provided with a first limiting bar and a second limiting bar, the first limiting bar is connected with a first limiting roller, the second limiting bar is connected with a second limiting roller, and the distance between the first limiting bar and the second limiting bar is equal to the width of the frame.

5. A spot welding apparatus with a movable carriage as claimed in claim 3, wherein the main body machine is provided with a first loading table and a second loading table, and both sides of the loading plate are respectively pressed against the first loading table and the second loading table.

6. A spot welding apparatus with a movable carriage as claimed in claim 3 wherein the lifting mechanism comprises a hand wheel, a drive shaft drivingly connected to the hand wheel, a screw nut assembly drivingly connected to the drive shaft.

7. The spot welding apparatus with a movable carrying cart according to claim 6, wherein the transmission shaft comprises a first reversing box connected to the hand wheel, a first shaft connected to the first reversing box, a second reversing box connected to the first shaft, a second shaft connected to the second reversing box and forming an angle of 90 degrees with the first shaft, a third shaft connected to the first reversing box and forming an angle of 180 degrees with the first shaft, a third reversing box connected to the third shaft, and a fourth shaft connected to the third reversing box and forming an angle of 90 degrees with the third shaft, wherein the plurality of screw nut assemblies are provided, and the plurality of screw nut assemblies are uniformly distributed on the second shaft and the fourth shaft.

8. The spot welding device with the movable carrying trolley according to claim 6, wherein the screw nut assembly comprises a nut seat and a screw, the nut seat is in driving connection with the transmission shaft, the top of the screw is connected with an end seat, and the end seat is mounted at the bottom of the carrying plate.

9. A spot welding apparatus with a movable carriage as recited in claim 3, wherein the product positioning jig comprises a jig table, a transverse baffle plate disposed on the jig table, a transverse movable plate engaged with the transverse baffle plate, a transverse screw nut for driving the transverse movable plate toward or away from the transverse baffle plate, a longitudinal baffle plate disposed on the jig table, a longitudinal movable plate engaged with the longitudinal baffle plate, and a longitudinal screw nut for driving the longitudinal movable plate toward or away from the longitudinal baffle plate.

10. A spot welding apparatus with a movable carriage as claimed in claim 3, wherein the bottom of the frame is provided with casters.