A double-sided spot welder

Abstract

The utility model relates to a double -sided spot welding machine belongs to welding technical field, its characterized in that: including spot welding machine body and slip support frame, spot welding machine body can be installed on slip support frame, the utility model can make improvement on the basis of portable small -size machine, through design into the form of split structure, it is convenient for the workpiece in the equipment bottom surface or narrow space to carry out remote welding operation, through setting slip support frame, can drive the outer stretching body that implements welding to separate fixed body, reaches the workpiece in narrow space, and the worker need not enter the space, can carry out remote control welding operation, operation is more convenient, and the application range is wider.

Description

Technical Field

[0001] This invention belongs to the field of welding technology, specifically a double-sided spot welding machine. Background Technology

[0002] A spot welding machine is a type of electric welding equipment that utilizes the principle of double-sided, double-point overcurrent welding. During operation, two electrodes clamp a layered metal workpiece from both sides, causing the two layers of metal to form a certain contact resistance under the pressure of the two electrodes. When the welding current flows from one electrode to the other electrode, an instantaneous thermal fusion is formed between the two contact resistance points. The welding current also flows instantaneously from the other electrode along the two workpieces to this electrode to form a circuit, without damaging the internal structure of the workpiece being welded, thus achieving the welding operation.

[0003] Existing double-sided spot welding equipment can be divided into two types according to size: large benchtop machines and portable mini machines. Large spot welding machines can provide a larger welding current and are used for welding thicker materials; while portable mini machines are lightweight and have a smaller welding current, making them suitable for welding thinner plates. For example, the utility model patent with publication number 205464771U, entitled "Portable Double-Sided Spot Welding Machine," is a typical example of this type of equipment. However, both types of double-sided spot welding machines require manual operation, which is extremely inconvenient when welding workpieces on the bottom of the equipment or in confined working spaces.

[0004] In view of this, a double-sided spot welding machine is proposed, which can be improved based on a portable small machine. By designing a split structure, it is convenient to perform remote welding operations on the bottom surface of the equipment or in a narrow space. Summary of the Invention

[0005] The purpose of this invention is to provide a double-sided spot welding machine to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a double-sided spot welding machine, comprising a spot welding machine body and a sliding support frame, wherein the spot welding machine body can be mounted on the sliding support frame; the spot welding machine body comprises a fixed body and an extended body, the extended body being detachably inserted into the fixed body; the fixed body comprises a fixed housing, within which a transformer, a circuit board, and a wire reel are disposed, and a power socket is provided on the fixed housing, the power socket being connected to the transformer and the circuit board via a fixed wire; the wire reel comprises a rotating body made of insulating material, and a winding handle is provided on the outside of the rotating body; a metal inner ring is embedded in the inner wall of the rotating shaft of the rotating body, and the circuit board elastically contacts the metal inner ring of the wire reel via a metal contact rod; an extended wire is wound around the rotating shaft of the rotating body, one end of the extended wire is fixedly connected to the metal inner ring, and the other end of the extended wire passes through the wire outlet hole of the fixed housing and connects to the first welding arm and the second welding arm inside the extended body.

[0007] Preferably, the extended body includes an extended shell, with an electrical wire inlet at the rear end of the extended shell, through which the extended electrical wire extends into the extended shell; a first sliding strip hole and a second sliding strip hole are provided at the front end of the extended shell, and a first welding arm and a second welding arm are respectively disposed in the first sliding strip hole and the second sliding strip hole; one end of the first welding arm and the second welding arm inserted into the extended shell are respectively connected to the positive and negative terminals of the extended electrical wire; the first welding arm and the second welding arm are connected by a closing arm control device, which can drive the first welding arm to move closer together or separate; a first welding head and a second welding head are respectively installed at the ends of the first welding arm and the second welding arm that extend out of the extended shell.

[0008] Preferably, the arm closing control device includes a first arm clamp, a second arm clamp, a first return spring, a second return spring, a first drive rod, a second drive rod, and an arm closing control motor. A partition mounting plate is provided in the middle of the extended housing. One end of the first return spring and the second return spring are respectively connected to the lower side of the upper side of the partition mounting plate. The other end of the first return spring and the second return spring are respectively connected to the first arm clamp and the second arm clamp. The first arm clamp and the second arm clamp respectively hold and fix the first welding arm and the second welding arm.

[0009] A longitudinal mounting slot is made in the partition mounting plate, and a closing arm control motor is installed in the longitudinal mounting slot. The closing arm control motor is powered by a built-in rechargeable battery. An active drive gear is installed on the motor shaft of the closing arm drive motor. A first drive rack and a second drive rack are respectively set on the side walls of the first drive rod and the second drive rod. The outer ends of the first drive rod and the second drive rod are respectively connected to and fixed to the first arm clamp and the second arm clamp. The inner ends of the first drive rod and the second drive rod are respectively inserted into the longitudinal mounting slot. The first drive rack and the second drive rack mesh with the active drive gear from both sides.

[0010] When the arm drive motor is started to rotate in the forward or reverse direction, it can engage the first drive rack and the second drive rack through the active drive gear, thereby causing the first drive rod and the second drive rod to move closer or further apart. At the same time, it drives the first arm clamp and the first welding arm, the second arm clamp and the second welding arm to move closer or further apart, thereby realizing the clamping and welding or releasing of the first welding head and the second welding head.

[0011] Preferably, a front guide rod and a rear guide rod are respectively provided on the front and rear sides of the inner side of the extended housing, and two guide sliding holes are respectively opened on the first drive arm and the second drive arm. The first drive arm and the second drive arm are respectively fitted onto the front guide rod and the rear guide rod through the two guide sliding holes.

[0012] Preferably, a flared clamping ring is provided at the front end of the fixed housing, and four clamping cylinders are arranged in a circular array on the inner wall of the clamping ring. The outer ends of the clamping cylinders are fixed to the inner wall of the clamping ring, and the inner ends of the clamping cylinders are open. A clamping spring is installed at the bottom of the fixed end of the clamping cylinder, and a clamping rubber block is installed at the outer end of the clamping spring. Each clamping rubber block can clamp and fix the rear end of the extended housing inserted into the clamping ring.

[0013] Preferably, two or more spherical insertion protrusions are provided on the front end face of the fixed housing, and the same number of spherical slots are provided on the rear end face of the extended housing; the spherical insertion protrusions are made of elastic material and can be inserted into the spherical slots; a fixing ring is provided on the outer periphery of the wire outlet hole, one end of a retaining spring is fixed on the fixing ring, and a retaining block is installed on the other end of the retaining spring; the retaining block can press against the outer wall of the spherical slot when the spherical insertion protrusions are inserted into the spherical slots.

[0014] Preferably, a fixed magnetic layer is provided on the inner side wall of the rear end of the extended housing, and several magnetic cylinders are linearly fitted on the positive and negative terminals of the extended wires that extend into the extended housing. When the first welding arm and the second welding arm approach each other, the positive and negative terminals and the magnetic cylinders fitted on them are driven to detach from the fixed magnetic layer. When the first welding arm and the second welding arm move away from each other, the fixed magnetic layer attracts the magnetic cylinders fitted on the positive and negative terminals, so that the positive and negative terminals are attached to the inner wall of the rear end of the extended housing.

[0015] Preferably, the sliding support frame includes a frame body, with electric wheels installed at the bottom of the frame body; a first support block and a second support block are installed at the upper end of the frame body, with fixing grooves provided on the first and second support blocks; a fixing arc plate is installed on the first and second support blocks by bolts; the shape of the clamping space formed by the fixing arc plate and the fixing groove matches the shape of the extended housing; the extended housing can be clamped and fixed between the fixing arc plate and the fixing groove; an external rechargeable battery is fixed on the frame body, which can provide power to the electric wheels.

[0016] Preferably, the outer wall of the extended housing is cylindrical, and the clamping space formed by the fixed arc plate and the fixed groove is also cylindrical; several spherical crown-shaped grooves are opened on the working surfaces of the fixed arc plate and the fixed groove, and guide balls are set in the spherical crown-shaped grooves, with each guide ball slidingly contacting the extended housing set in the clamping space; welding angle adjustment devices are set in both the first support block and the second support block; the welding angle adjustment device includes an angle adjustment motor, with an active adjustment gear mounted on the motor shaft of the angle adjustment motor, and the active adjustment gear meshing with the passive adjustment gear; an adjustment hole is opened on the side wall of the fixed groove, and part of the gear surface of the passive adjustment gear extends into the fixed groove through the adjustment hole; a gear ring is fitted on the outer wall of the extended housing, and the outer tooth surface of the passive adjustment gear meshes with the gear ring; when the angle adjustment motor drives the active adjustment gear to rotate, the passive adjustment gear meshes with the gear ring, driving the extended housing to rotate in the clamping space; the angle adjustment motor is a servo motor.

[0017] Preferably, it also includes a controller, which is capable of remotely controlling the boom control motor, the angle adjustment motor, and the electric walking wheels; a camera mounting bracket is set on the sliding support frame, and a wireless camera is installed on the camera mounting bracket.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention improves upon the portable miniature machine by designing a split structure, which facilitates remote welding operations on workpieces on the bottom surface of the equipment or in confined spaces.

[0020] 2. By setting up a sliding support frame, the extended body for welding can be moved away from the fixed body and reach the workpiece in a confined space for remote control welding operations. Workers do not need to enter the space, making the operation more convenient and the application range wider.

[0021] 3. The arm closing control device drives the welding head to close via the arm closing drive motor, enabling double-sided spot welding. The first and second return springs ensure that the two welding arms remain in a tensile and stable state whether they are separated or close together. The front and rear guide rods ensure that the first and second welding arms remain parallel during movement, preventing any jamming.

[0022] 4. A fixed magnetic layer is installed on the inner wall of the rear end of the extended housing. Several magnetic cylinders are linearly fitted onto the positive and negative terminals of the extended wires that extend into the extended housing. When the first welding arm and the second welding arm approach each other, the positive and negative terminals and the magnetic cylinders fitted onto them are pulled away from the fixed magnetic layer. When the first welding arm and the second welding arm move away from each other, the fixed magnetic layer attracts the magnetic cylinders fitted onto the positive and negative terminals, causing the positive and negative terminals to adhere to the inner wall of the rear end of the extended housing, preventing wire wear and short circuits from occurring after long-term use.

[0023] 5. This invention provides two methods for connecting and fixing the extended body and the fixed body, both of which can firmly fix the two and are easy to separate. Repeated use will not affect the connection firmness, effectively extending the service life of the equipment. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the spot welding machine body in Example 1 (the fixed body and the extended body are inserted together).

[0025] Figure 2 for Figure 1 Enlarged view of part A;

[0026] Figure 3 This is a schematic diagram of the spot welding machine body in Example 1 (extended body state).

[0027] Figure 4 This is a schematic diagram of the sliding support frame.

[0028] Figure 5 This is a schematic diagram of the internal structure of the first support block;

[0029] Figure 6 This is a schematic diagram of the structure of an electric telescopic boom;

[0030] Figure 7 This is a schematic diagram of the structure of the spot welding machine body in Example 2;

[0031] In the diagram: 1. First welding head; 2. First welding arm; 3. Arm closing control device; 4. Second welding head; 5. Outer housing; 6. Fixed housing; 7. Rotary wheel; 8. Metal inner ring; 9. Power socket; 10. Transformer; 11. Circuit board; 12. Retracting handle; 13. Metal contact rod; 14. Second welding arm; 15. Front guide rod; 16. First return spring; 17. First arm clamp; 18. First drive rod; 19. First drive rack; 20. Rear guide rod; 21. Positive terminal connection; 22. Fixed magnetic layer; 23. Spherical slot; 24. Spherical insertion protrusion; 25. Clamping block; 26. Clamping spring; 27. Fixing ring; 28. Wire outlet; 29. ​​Wire inlet; 30. Negative terminal connection; 31. Middle partition mounting plate; 32. Second drive rack; 33. Second drive rod; 34. Second Arm clamp; 35. Second return spring; 36. Guide slide hole; 37. Second sliding bar hole; 38. Arm closing control motor; 39. Longitudinal mounting slot; 40. Active drive gear; 41. First sliding bar hole; 42. Fixed wire; 43. Outgoing wire; 44. Electric walking wheel; 45. External rechargeable battery; 46. Camera mounting bracket; 47. First support block; 48. Second support block; 49. Frame; 50. Control module; 51. Fixed groove; 52. Fixed arc plate; 53. Guide ball; 54. Spherical crown groove; 55. Adjustment hole; 56. Passive adjustment gear; 57. Active adjustment gear; 58. Angle adjustment motor; 59. Electric gripper; 60. Electric telescopic rod; 61. Clamping cylinder; 62. Clamping spring; 63. Clamping rubber block; 64. Clamping ring. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figure 1 , 2 As shown in Figures 3, 4, 5 and 6, the double-sided spot welding machine of the present invention includes a spot welding machine body and a sliding support frame, wherein the spot welding machine body can be mounted on the sliding support frame.

[0035] like Figure 1 , 2As shown in Figure 3, the spot welding machine body includes a fixed body and an extended body. The extended body is detachably inserted into the fixed body. The fixed body includes a fixed housing 6, in which a transformer 10, a circuit board 11, and a wire reel are disposed. A power socket 9 is provided on the fixed housing 6, and the power socket 9 is connected to the transformer 10 and the circuit board 11 through a fixed wire 42. The wire reel includes a rotating body 7, which is made of insulating material. A winding handle 12 is provided on the outside of the rotating body 7. A metal inner ring 8 is embedded in the inner wall of the rotating shaft of the rotating body 7. The circuit board 11 elastically contacts the metal inner ring 8 of the wire reel through a metal contact rod 13. An extended wire 43 is wound on the rotating shaft of the rotating body 7. One end of the extended wire 43 is fixedly connected to the metal inner ring 8, and the other end of the extended wire 43 passes through the wire outlet 28 of the fixed housing and connects to the first welding arm 2 and the second welding arm 14 inside the extended body.

[0036] like Figure 2 As shown, the extended body includes an extended shell 5. An electric wire inlet 29 is provided at the rear end of the extended shell 5, through which an extended electric wire 43 extends into the extended shell 5. A first sliding strip hole 41 and a second sliding strip hole 37 are provided at the front end of the extended shell 5. A first welding arm 2 and a second welding arm 14 are respectively disposed in the first sliding strip hole 41 and the second sliding strip hole 37. One end of the first welding arm 2 and the second welding arm 14 inserted into the extended shell is respectively connected to the positive terminal 21 and the negative terminal 30 of the extended electric wire 43. The first welding arm 2 and the second welding arm 14 are connected by a closing control device 3, which can drive the first welding arm 2 to move closer together or separate. A first welding head 1 and a second welding head 4 are respectively installed at the ends of the first welding arm 2 and the second welding arm 14 that extend out of the extended shell 5.

[0037] The arm closing control device 3 includes a first arm clamp 17, a second arm clamp 34, a first return spring 16, a second return spring 35, a first drive rod 18, a second drive rod 33, and an arm closing control motor 38. A partition mounting plate 31 is provided in the middle of the extended housing 5. One end of the first return spring 16 and the second return spring 35 are respectively connected to the lower end of the partition mounting plate 31. The other end of the first return spring 16 and the second return spring 35 are respectively connected to the first arm clamp 17 and the second arm clamp 34. The first arm clamp 17 and the second arm clamp 34 respectively clamp and fix the first welding arm 2 and the second welding arm 14.

[0038] A longitudinal mounting groove 39 is formed on the partition mounting plate 31, and a closing arm control motor 38 is installed in the longitudinal mounting groove 39. The closing arm control motor 38 is powered by a built-in rechargeable battery. An active drive gear 40 is installed on the motor shaft of the closing arm drive motor. A first drive rack 19 and a second drive rack 32 are respectively set on the side walls of the first drive rod 18 and the second drive rod 33. The outer ends of the first drive rod 18 and the second drive rod 33 are respectively connected and fixed to the first arm clamp 17 and the second arm clamp 34. The inner ends of the first drive rod 18 and the second drive rod 33 are respectively inserted into the longitudinal mounting groove 39. The first drive rack 19 and the second drive rack 32 mesh with the active drive gear 40 from both sides.

[0039] When the arm drive motor is started to rotate in the forward or reverse direction, the first drive rack 19 and the second drive rack 32 are respectively engaged by the active drive gear 40, which causes the first drive rod 18 and the second drive rod 33 to move closer or further apart. At the same time, the first arm clamp 17 and the first welding arm, the second arm clamp 34 and the second welding arm move closer or further apart, thereby realizing the clamping and welding or release of the first welding head 1 and the second welding head 4.

[0040] A front guide rod 15 and a rear guide rod 20 are respectively provided on the front and rear sides of the inner side of the extended housing 5. Two guide sliding holes 36 are respectively opened on the first drive arm and the second drive arm. The first drive arm and the second drive arm are respectively fitted onto the front guide rod 15 and the rear guide rod 20 through the two guide sliding holes 36.

[0041] Two or more spherical insertion protrusions 24 are provided on the front end face of the fixed housing, and the same number of spherical slots 23 are provided on the rear end face of the extended housing. The spherical insertion protrusions 24 are made of elastic material and can be inserted into the spherical slots 23. A fixing ring 27 is provided on the outer periphery of the wire outlet hole 28. One end of the clamping spring 26 is fixed on the fixing ring 27, and a clamping block 25 is installed on the other end of the clamping spring 26. The clamping block 25 can press against the outer wall of the spherical slot 23 when the spherical insertion protrusions 24 are inserted into the spherical slots 23.

[0042] A fixed magnetic layer 22 is provided on the inner side wall of the rear end of the extended housing. Several magnetic tubes are linearly mounted on the positive terminal 21 and negative terminal 30 of the extended wire 43 that extends into the extended housing. When the first welding arm 2 and the second welding arm 14 approach each other, the positive terminal 21 and the negative terminal 30 and the magnetic tubes mounted on them are driven to detach from the fixed magnetic layer 22. When the first welding arm 2 and the second welding arm 14 move away from each other, the fixed magnetic layer 22 attracts the magnetic tubes mounted on the positive terminal 21 and the negative terminal 30, so that the positive terminal 21 and the negative terminal 30 are attached to the inner wall of the rear end of the extended housing.

[0043] like Figure 4 and 5As shown, the sliding support frame includes a frame body 49, which is a lifting support frame (the lifting function is generally implemented as follows: the frame body 49 is divided into an upper frame body and a lower frame body, and the upper frame body is installed on the lower frame body by a lifting cylinder). Electric walking wheels 44 are installed at the bottom of the frame body 49; a first support block 47 and a second support block 48 are installed at the upper end of the frame body 49. Fixing grooves 51 are provided on the first support block 47 and the second support block 48. A fixing arc plate 52 is installed on the first support block 47 and the second support block 48 by bolts. The shape of the clamping space formed by the fixing arc plate 52 and the fixing groove 51 matches the shape of the extended housing; the extended housing 5 can be clamped and fixed between the fixing arc plate 52 and the fixing groove 51; an external rechargeable battery 45 is fixed on the frame body 49, which can provide power to the electric walking wheels 44.

[0044] The outer wall of the extended shell 5 is cylindrical, and the clamping space formed by the fixed arc plate 52 and the fixed groove 51 is also cylindrical. Several spherical crown-shaped grooves 54 are formed on the working surfaces of the fixed arc plate 52 and the fixed groove 51. Guide balls 53 are arranged within the spherical crown-shaped grooves 54, and each guide ball 53 slides in contact with the extended shell 5 located within the clamping space. Welding angle adjustment devices are provided in both the first support block 47 and the second support block 48. The welding angle adjustment device includes an angle adjustment motor 58, and a motor shaft of the angle adjustment motor 58 is mounted on... An active adjusting gear 57 is installed, which meshes with a passive adjusting gear 56. An adjusting hole 55 is opened on the side wall of the fixed groove 51, and part of the gear surface of the passive adjusting gear 56 extends into the fixed groove 51 through the adjusting hole 55. A toothed ring is fitted on the outer wall of the extended housing 5, and the outer tooth surface of the passive adjusting gear 56 meshes with the toothed ring. When the angle adjusting motor 58 drives the active adjusting gear to rotate, the passive adjusting gear 56 can mesh with the toothed ring, thereby driving the extended housing to rotate within the clamping space. The angle adjusting motor 58 is a servo motor.

[0045] It also includes a controller, which can be a remote control with an LCD screen, or the remote control function can be integrated into a smartphone for use as a remote controller. The controller can remotely control the boom control motor 38, the angle adjustment motor 58, and the electric travel wheels 44. A camera mounting bracket 46 can be installed on the sliding support frame, and a wireless camera can be mounted on the camera mounting bracket 46. A control module 50 is installed inside the sliding support frame to receive video information acquired by the wireless camera and send it to the LCD screen on the controller to display the real-time operation status. The control module 50 also integrates a signal receiver to receive the wireless control signal from the controller, thereby causing the motor shaft of the angle adjustment motor 58 to rotate to the required angle. Similarly, a similar control module 50 can be installed inside the extended body to receive wireless signals and control the boom drive motor in the boom control device 3, ensuring smooth welding operations.

[0046] like Figure 6 As shown, it also includes an electric telescopic arm, which includes an electric telescopic rod body 60. An electric gripper 59 is installed at the front end of the electric telescopic rod body 60. The electric gripper 59 can automatically open and close to grip and slide the support frame. The electric telescopic arm can grip the sliding support frame or the extended body through the electric gripper 59 and drive it to move short distances.

[0047] The method of using this device is as follows:

[0048] When performing ordinary double-sided spot welding, the extended body needs to be inserted and fixed on the fixed body. The arm closing drive motor of the arm closing control device 3 is controlled to bring the first welding arm 2 and the second welding arm 14 closer together, so that the first welding head 1 and the second welding head 4 clamp and weld the thin metal sheet workpiece between them.

[0049] When welding workpieces need to be welded to the bottom of the equipment or in confined spaces, first, the fixed body of the welding machine is securely placed on the workbench or ground. The extended body is then detached from the fixed body and fixed within the clamping space formed by the fixed arc plate 52 and the fixed groove 51 on the sliding support frame, secured with bolts. For close-range operations, the electric telescopic arm can clamp and drive the sliding support frame, extending and retracting it to the working position. For long-range operations, such as welding on the bottom of large equipment, the electric wheels 44 of the sliding support frame can be controlled via remote control, combined with real-time imaging from a wireless camera, to move the extended body to the welding position. Then, the angle adjustment motor 58 is remotely controlled to rotate the extended body to a preset angle within the clamping space. Finally, the remote-controlled arm closing device 3 moves the first welding arm 2 and the second welding arm 14 closer together for real-time welding.

[0050] After the welding operation is completed, the extended wire 43 can be re-coiled onto the reel body 7 by rotating the take-up handle 12, and the extended head can be re-inserted back onto the fixed body to restore the initial state.

[0051] Implementation of Column 2

[0052] like Figure 7 As shown, a flared clamping ring 64 is provided at the front end of the fixed housing 6. Four clamping cylinders 61 are arranged in a circular array on the inner wall of the clamping ring 64. The outer end of the clamping cylinder 61 is fixed to the inner wall of the clamping ring 64, and the inner end of the clamping cylinder 61 is open. A clamping spring 62 is installed at the bottom of the fixed end of the clamping cylinder 61. A clamping rubber block 63 is installed at the outer end of the clamping spring 62. Each clamping rubber block 63 can clamp and fix the rear end of the extended housing inserted into the clamping ring 64.

[0053] This embodiment provides another insertion method for the extended body and the fixed body, which can replace the insertion structure of the spherical insertion protrusion 24 and the spherical slot 23 in Embodiment 1.

[0054] Although embodiments of the invention 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 to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-sided spot welder characterized by: The point welder body can be installed on the sliding support frame; the point welder body comprises a fixed body and an extended body, the extended body is detachably inserted into the fixed body; the fixed body comprises a fixed shell, a transformer, a circuit board and a wire reel are arranged in the fixed shell, a power socket is formed on the fixed shell, the power socket is connected with the transformer and the circuit board through fixed wires; the wire reel comprises a rotating body made of insulating material, a winding crank is arranged outside the rotating body, a metal inner ring is embedded on the inner wall of the rotating shaft of the rotating body, the circuit board is elastically contacted with the metal inner ring of the wire reel through a metal contact rod, an extended wire is wound on the rotating shaft of the rotating body, one end of the extended wire is fixedly connected with the metal inner ring, and the other end of the extended wire passes through a wire outlet hole of the fixed shell and is connected with first and second welding arms in the extended body; the extended body comprises an extended shell, a wire inlet hole is formed at the rear end of the extended shell, the extended wire extends into the extended shell through the wire inlet hole, first and second sliding strip holes are formed at the front end of the extended shell, the first and second welding arms are arranged in the first and second sliding strip holes respectively, one end of the first and second welding arms inserted into the extended shell is connected with positive and negative connection wires of the extended wire respectively, the first and second welding arms are connected through an arm control device, the arm control device can drive the first welding arm to approach or separate from each other, and the ends of the first and second welding arms extending out of the extended shell are respectively provided with first and second welding heads; the arm control device comprises first and second arm clamps, first and second return springs, first and second drive rods and an arm control motor, a middle partition plate is arranged in the middle of the extended shell, one end of the first and second return springs is connected with the upper side of the middle partition plate, the other end of the first and second return springs is connected with the first and second arm clamps respectively, and the first and second arm clamps are respectively clamped with the first and second welding arms; a longitudinal installation groove is formed on the middle partition plate, the arm control motor is installed in the longitudinal installation groove, and the arm control motor is powered by a built-in rechargeable battery; a driving gear is installed on the motor shaft of the arm control motor, first and second drive racks are arranged on the side walls of the first and second drive rods respectively, the outer ends of the first and second drive rods are connected with the first and second arm clamps respectively, the inner ends of the first and second drive rods are inserted into the longitudinal installation groove respectively, and the first and second drive racks are respectively meshed with the driving gear from both sides; when the arm control motor is started to rotate forward or reversely, the first and second drive racks can be meshed with the driving gear respectively, then the first and second drive rods approach or separate from each other, and the first and second arm clamps and the first and second welding arms approach or separate from each other, so that the first and second welding heads are clamped and welded or released. The sliding support frame comprises a frame body, an electric walking wheel is installed at the bottom of the frame body, a first support block and a second support block are installed at the upper end of the frame body, a fixed groove is arranged on the first support block and the second support block, a fixed arc plate is installed on the first support block and the second support block through bolts, the shape of the clamping space formed by the fixed arc plate and the fixed groove matches the shape of the outer extension shell, the outer extension shell can be clamped and fixed between the fixed arc plate and the fixed groove, an external charging storage battery is fixed on the frame body, and the external charging storage battery can provide electric energy for the electric walking wheel. The outer wall of the outer extension shell is in a cylindrical shape, the clamping space formed by the fixed arc plate and the fixed groove is also in a cylindrical shape, a plurality of spherical cap-shaped grooves are formed on the working surface of the fixed arc plate and the fixed groove, guide balls are arranged in the spherical cap-shaped grooves, each guide ball is in sliding contact with the outer extension shell arranged in the clamping space, a welding angle adjusting device is arranged in the first support block and the second support block, the welding angle adjusting device comprises an angle adjusting motor, a driving adjusting gear is installed on the motor shaft of the angle adjusting motor, the driving adjusting gear meshes with a driven adjusting gear, an adjusting hole is formed on the side wall of the fixed groove, part of the gear surface of the driven adjusting gear extends into the fixed groove through the adjusting hole, a gear ring is sleeved on the outer wall of the outer extension shell, the outer gear surface of the driven adjusting gear and the gear ring are in meshing engagement, when the angle adjusting motor drives the driving adjusting gear to rotate, the driven adjusting gear meshes with the gear ring to drive the outer extension shell to rotate in the clamping space, and the angle adjusting motor is a servo motor. A controller is further arranged, the controller can remotely control the arm control motor, the angle adjusting motor and the electric walking wheel, a camera mounting bracket is arranged on the sliding support frame, and a wireless camera is mounted on the camera mounting bracket.

2. A dual-sided spot welder as defined in claim 1, wherein: A front guide rod and a rear guide rod are arranged at the inner front side and the inner rear side of the outer extension shell respectively, two guide sliding holes are formed on the first driving arm and the second driving arm respectively, and the first driving arm and the second driving arm are sleeved on the front guide rod and the rear guide rod respectively through the two guide sliding holes.

3. A dual-sided spot welder as defined in claim 2, wherein: A horn-shaped clamping ring body is arranged at the front end of the fixed shell, four clamping cylinders are arranged in an annular array on the inner wall of the clamping ring body, the outer ends of the clamping cylinders are fixed on the inner wall of the clamping ring body, and the inner ends of the clamping cylinders are open, a clamping spring is installed at the bottom of the fixed end of the clamping cylinder, a clamping rubber block is installed at the outer end of the clamping spring, and each clamping rubber block can clamp and fix the rear end of the outer extension shell inserted into the clamping ring body.

4. A dual-sided spot welder as defined in claim 3, wherein: Two or more spherical plug-in protrusions are arranged on the front end surface of the fixed shell, and the same number of spherical plug-in grooves are correspondingly arranged on the rear end surface of the outer extension shell, the spherical plug-in protrusions are made of elastic material and can be inserted into the spherical plug-in grooves, a fixing ring is arranged on the outer periphery of the wire outlet hole, one end of a pressing spring is fixed on the fixing ring, the other end of the pressing spring is installed with a pressing block, and the pressing block can press against the outer wall of the spherical plug-in groove when the spherical plug-in protrusion is inserted into the spherical plug-in groove.

5. A double-sided spot welder according to claim 3 or 4, characterised in that: The fixed magnetic attraction layer is arranged on the inner wall of the rear end of the outer extension machine shell, and a plurality of magnetic attraction cylinders are linearly sleeved on the positive electrode wire and the negative electrode wire of the outer extension electric wire extending into the outer extension machine shell; when the first welding arm and the second welding arm approach each other, the positive electrode wire and the negative electrode wire and the magnetic attraction cylinders sleeved thereon are separated from the adsorption of the fixed magnetic attraction layer; when the first welding arm and the second welding arm move away from each other, the fixed magnetic attraction layer adsorbs the magnetic attraction cylinders sleeved on the positive electrode wire and the negative electrode wire, so that the positive electrode wire and the negative electrode wire are attached to the inner wall of the rear end of the outer extension machine shell.

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