Variable-speed wire feeder of digital welding machine and use method of variable-speed wire feeder

Abstract

The variable-speed wire feeder comprises an outer shell, a reset power assembly and a straightening assembly, the reset power assembly and the straightening assembly are arranged in the outer shell, and the reset power assembly comprises a sliding rail and a first telescopic rod which are fixedly arranged on the inner bottom face of the outer shell; the first telescopic rod is arranged in the sliding rail, a sliding plate is fixedly arranged at the telescopic end of the first telescopic rod, a sliding groove arranged outside the sliding plate in a sleeving mode is formed in the sliding rail, and two limiting frames are symmetrically arranged on the sliding plate. By using the reset power assembly, the straightening assembly and the limiting assembly, welding wires which are being conveyed and bent and twisted can be conveniently and rapidly corrected, the problem that the welding wires are clamped in the wire feeder is solved, the welding wires are prevented from being wound in the wire feeder, and then mechanical parts in the wire feeder are prevented from being damaged; and meanwhile, the welding wires pulled out of the rotating disc can be limited, great abrasion generated by the welding wires can be reduced, and use is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of welding machine equipment, and in particular to a variable speed wire feeder of a digital welding machine and a use method thereof. Background Art

[0002] A digital welding machine is a welding machine controlled by a microprocessor. It has the core advantages of high precision, high flexibility and high reliability. Compared with traditional analog welding machines, digital welding machines use digital signal processing technology to improve the accuracy and stability of the system. In order to facilitate the use of digital welding machines, a variable speed wire feeder is required to transport the welding wire. The wire feeder can improve the efficiency of conveying welding wire and at the same time can better improve the accuracy of wire feeding.

[0003] The existing wire feeder can only feed the welding wire gradually when in use, and is unable to quickly correct the welding wire that is being fed and is bent and twisted, which can easily cause the wire to get stuck inside the wire feeder, which is not conducive to improving the wire feeding efficiency. It can easily cause the welding wire to get tangled inside the wire feeder, which can easily cause damage to the mechanical parts inside the wire feeder, which is not conducive to increasing the service life of the parts inside the wire feeder. At the same time, it is unable to limit the welding wire pulled out from the turntable, which can easily cause the welding wire to be pulled and cause greater wear between parts, which is not conducive to the complete protection of the welding wire. Summary of the invention

[0004] The object of the present invention is to provide a variable speed wire feeder for a digital welding machine and a method for using the same, so as to solve the problem that the existing wire feeder cannot quickly correct the bent and twisted welding wire being conveyed during use, which easily causes the wire to get stuck inside the wire feeder, and the welding wire is wound inside the wire feeder, which easily causes damage to the mechanical parts inside the wire feeder. At the same time, the welding wire pulled out from the turntable cannot be limited, which easily causes the welding wire to be pulled and causes greater wear between the parts.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions. The present invention comprises an outer shell, a reset power assembly and a straightening assembly, wherein the reset power assembly and the straightening assembly are installed in the outer shell, the reset power assembly comprises a slide rail and a telescopic rod 1 fixedly installed on the inner bottom surface of the outer shell, the telescopic rod 1 is installed in the slide rail and a slide plate is fixedly installed on the telescopic end, the slide rail is provided with a slide groove sleeved on the outside of the slide plate, the slide plate is symmetrically provided with two limit frames, the straightening assembly comprises two symmetrically provided straightening structures, the straightening structure comprises a motor 1 fixedly installed inside the limit frame and a gear and a rotating shaft penetrated inside the limit frame, the rotating shaft is provided with a tooth groove, the gear is fixedly connected to the output shaft of the motor 1 and meshed with the tooth groove, two clamps are symmetrically installed inside the rotating shaft, each of the clamps is fixedly provided with a telescopic rod 2 fixedly connected to the rotating shaft, and a heating wire is installed inside each of the clamps.

[0006] Preferably, a limiting component is installed inside the outer shell, and the limiting component is used to limit the welding wire.

[0007] Preferably, the limiting assembly includes a bracket fixedly connected to the slide rail and two symmetrically installed limiting wheels, the bracket is fixedly provided with a bidirectional push rod, and the two telescopic ends of the bidirectional push rod are fixedly provided with bearings respectively inserted into the two limiting wheels.

[0008] Preferably, a conveying component is installed in the outer shell, and the conveying component is used to convey the welding wire.

[0009] Preferably, the conveying assembly includes a base fixedly mounted in the outer shell, two pulleys 1 and a top frame are symmetrically mounted on the base, each of the top frames is fixedly mounted with a pulley 2 located above the pulley 1, and two motors 2 are symmetrically mounted on the side walls of the base, and the output shafts of the two motors 2 are respectively fixedly connected to the side walls of the two pulleys 1.

[0010] Preferably, a support assembly is installed in the outer shell, and the support assembly is used for retracting and releasing the welding wire.

[0011] Preferably, the support assembly includes a support transverse axis fixedly connected to the inner side wall of the outer shell, a turntable is sleeved on the support transverse axis and a screw hole is opened at the end, a bolt is threadedly connected to the screw hole, and a handle located on one side of the turntable is fixedly mounted on the bolt.

[0012] Preferably, a joint is fixedly mounted on the side wall of the outer shell.

[0013] Preferably, a supporting leg is fixedly mounted below the outer shell.

[0014] Preferably, a method for pre-processing a test specimen comprises the following steps:

[0015] Step 1: After the welding wire is passed through the two clamping plates, the clamping plates connected thereto are driven to clamp and extrude the welding wire by starting the second telescopic rod, the first motor is started to drive the gear to rotate, the gear rotation drives the rotating shaft to rotate through the tooth groove, the rotating shaft rotation drives the clamping plates to rotate through the second telescopic rod, the clamping plates squeeze and rotate around the welding wire, and at the same time, the heating wire is started to heat the welding wire through the clamping plates, so that the welding wire can be clamped straight;

[0016] Step 2: The telescopic rod 1 is started to drive the slide to move, the slide drives the limit frame to move, the limit frame drives the clamping plate to move through the rotating shaft and the telescopic rod 2, and the clamping plate moves synchronously with the moving welding wire;

[0017] Step three: The welding wire is passed through between the two limiting wheels. The bearings on both sides are driven to approach each other by starting the two-way push rod. The bearings on both sides respectively drive the limiting wheels on both sides to approach the welding wire at the same time. The gap between the two limiting wheels is at the same height as the gap between the upper and lower clamping plates. The welding wire between the two limiting wheels enters horizontally between the two clamping plates.

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

[0019] 1. Through the coordinated use of the resetting power assembly and the straightening assembly, it is possible to quickly correct the welding wire that is bent and twisted during transportation, prevent the welding wire from being stuck inside the wire feeder, and prevent the welding wire from being wound inside the wire feeder, thereby damaging the internal mechanical parts of the wire feeder.

[0020] 2. By using the limit assembly, the welding wire pulled out from the turntable can be limited, which can facilitate the horizontal transportation of the welding wire into the space between the upper and lower clamping plates, greatly reducing the wear caused by the welding wire being stretched and transported. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view structural schematic diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the split structure of the resetting power component and the straightening component of the present invention;

[0023] Figure 3 It is a schematic cross-sectional structure diagram of the resetting power assembly and the straightening assembly of the present invention;

[0024] Figure 4 It is a right view structural schematic diagram of the limit assembly of the present invention;

[0025] Figure 5 It is a left-side structural schematic diagram of the conveying assembly of the present invention;

[0026] Figure 6 It is a schematic diagram of the split structure of the support assembly of the present invention;

[0027] Figure 7 It is a right view structural schematic diagram of the present invention.

[0028] The numbers in the figure represent:

[0029] 1. Outer shell; 2. Reset power assembly; 201. Slide rail; 202. Telescopic rod 1; 203. Slide plate; 204. Limiting frame; 3. Straightening assembly; 301. Motor 1; 302. Gear; 303. Rotating shaft; 304. Clamp; 305. Telescopic rod 2; 306. Heating wire; 4. Slide groove; 5. Tooth groove; 6. Limiting assembly; 601. Bracket; 602. Limiting wheel; 603. Two-way push rod; 604. Bearing; 7. Conveying assembly; 701. Base; 702. Pulley 1; 703. Top frame; 704. Pulley 2; 705. Motor 2; 8. Support assembly; 801. Support horizontal axis; 802. Turntable; 803. Bolt; 804. Handle; 9. Screw hole; 10. Joint; 11. Leg. DETAILED DESCRIPTION

[0030] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0031] Embodiment 1

[0032] The present invention provides a technical solution: a variable speed wire feeder for a digital welding machine and a method for using the same, such as Figure 1-3 and Figure 7As shown, it includes an outer shell 1, a reset power component 2 and a straightening component 3, the reset power component 2 and the straightening component 3 are installed in the outer shell 1, the reset power component 2 includes a slide rail 201 and a telescopic rod 202 fixedly installed on the inner bottom surface of the outer shell 1, the slide rail 201 can conveniently fix the telescopic rod 202, the telescopic rod 202 can drive the slide plate 203 to move, the telescopic rod 202 is installed in the slide rail 201 and the slide plate 203 is fixedly installed on the telescopic end, the slide plate 203 can support the limit frame 204, the slide rail 201 is provided with a slide groove 4 sleeved on the outside of the slide plate 203, the slide groove 4 can limit and support the slide plate 203, two limit frames 204 are symmetrically installed on the slide plate 203, the limit frames 204 can support and limit the rotating shaft 303, the straightening component 3 includes two symmetrically installed straightening structures, the straightening structure It includes a motor 1 301 fixedly mounted inside the limit frame 204 and a gear 302 and a rotating shaft 303 penetrated inside the limit frame 204. The motor 1 301 can drive the gear 302 to rotate, and the gear 302 can drive the tooth groove 5 to rotate. The rotating shaft 303 can support the telescopic rod 2 305. The rotating shaft 303 is provided with a tooth groove 5, and the tooth groove 5 can mesh with the gear 302. The gear 302 is fixedly connected to the output shaft of the motor 1 301 and meshes with the tooth groove 5. Two clamping plates 304 are symmetrically mounted inside the rotating shaft 303, and the clamping plates 304 can conveniently clamp the welding wire. Each clamping plate 304 is fixedly mounted with a telescopic rod 2 305 fixedly connected to the rotating shaft 303. The telescopic rod 2 305 can drive the clamping plate 304 to move. A heating wire 306 is mounted inside each clamping plate 304, and the heating wire 306 can heat the clamping plate 304.

[0033] The welding wire pulled out from the rotating disk 802 is passed between the upper and lower clamping plates 304 on both sides, and the clamping plates 304 connected thereto are driven to move by starting each telescopic rod 2 305 at the same time. The clamping plates 304 on both sides are close to and clamp the welding wire, and the clamping plates 304 can squeeze the bent parts on the welding wire. At this time, the welding wire is passed through the inside of the rotating shaft 303, and the welding wire clamped by the clamping plates 304 inside the rotating shaft 303 is in the central axis area of ​​the rotating shaft 303. By starting the motor 1 301, the gear 302 is driven to rotate, the gear 302 drives the tooth groove 5 to rotate, and the tooth groove 5 drives the rotating shaft 303 03 rotates, the rotating shaft 303 rotates around its own central axis, the rotation of the rotating shaft 303 can drive the telescopic rod 2 305 to rotate, the telescopic rod 2 305 can drive the clamping plate 304 to rotate, the clamping plate 304 inside the rotating shaft 303 can rotate around the central axis of the rotating shaft 303, the rotation of the clamping plate 304 can surround and extrude the welding wire, and at the same time, the heating wire 306 is started to heat the clamping plate 304, and the heating of the clamping plate 304 can heat the welding wire, which can be beneficial to change the characteristics of the welding wire, facilitate the welding wire to be surrounded and clamped by the clamping plate 304 to form, and is beneficial to the welding wire to be quickly clamped and straightened.

[0034] When the motor 1 301 is started, the slide rail 201 fixes the fixed end of the telescopic rod 1 202, and the slide plate 203 is driven to move by starting the telescopic rod 1 202. The slide plate 203 slides in the slide slot 4 and drives the limit frame 204 to move. The movement of the limit frame 204 drives the rotation shaft 303 to move. The movement of the rotation shaft 303 drives the telescopic rod 2 305 to move. The telescopic rod 2 305 drives the clamping plate 304 to move. Figure 1 As shown, the clamping plate 304 clamps the welding wire straight and moves to the right synchronously with the welding wire, which can reduce the friction between the clamping plate 304 and the welding wire. When the rotating shaft 303 on the right side moves to the right side of the slide rail 201, the clamping plate 304 is driven away from the welding wire through the telescopic rod 205, and the telescopic rod 1 202 drives the slide plate 203 to move left, and the slide plate 203 drives the limiting frame 204 to move left, and the limiting frame 204 drives the rotating shaft 303 to move left, and the rotating shaft 303 drives the telescopic rod 2 305 to move left, and the telescopic rod 2 305 drives the clamping plate 304 to move left. The two clamping plates 304 on the left side can be clamped on the welding wire at one end between the two rotating shafts 303 in the previous step, and the two clamping plates 304 on the left side can be clamped on the welding wire that has just extended from between the two limiting wheels 602. Repeating the above movement can continuously clamp the welding wire straight.

[0035] Embodiment 2

[0036] like Figure 1 , Figure 4 and Figure 7 As shown, a limit assembly 6 is installed inside the outer shell 1, and the limit assembly 6 is used to limit the welding wire. The limit assembly 6 includes a bracket 601 fixedly connected to the slide rail 201 and two symmetrically installed limit wheels 602. The bracket 601 can conveniently support the two-way push rod 603, and the limit wheel 602 can limit the welding wire. The bracket 601 is fixedly installed with a two-way push rod 603, and the two-way push rod 603 can drive the bearings 604 on the upper and lower sides to move. The two telescopic ends of the two-way push rod 603 are fixedly installed with bearings 604 respectively inserted into the two limit wheels 602, and the bearings 604 can conveniently support the limit wheels 602.

[0037] The welding wire pulled out from the turntable 802 is passed between the two limiting wheels 602, and the bracket 601 can fix and support the fixed end of the two-way push rod 603, and the bearings 604 on the upper and lower sides are driven to approach each other by starting the two-way push rod 603. The two bearings 604 approach each other and drive the limiting wheels 602 on the upper and lower sides to approach each other, and the limiting wheels 602 on both sides are close to the welding wire, and the limiting wheels 602 can limit the welding wire. When the welding wire moves inside the limiting wheels 602, the limiting wheels 602 can rotate, which can reduce the friction caused by the mutual misalignment between the welding wire and the limiting wheels 602. The center point of the gap between the two limiting wheels 602 and the center point of the gap between the upper and lower clamping plates 304 always maintain the same height, and the welding wire entering between the two clamping plates 304 from between the two limiting wheels 602 always maintains a horizontal state, which can reduce the grinding caused by the inclination of the welding wire and the friction between the clamping plates 304.

[0038] like Figure 1 , Figure 5 and Figure 7 As shown, a conveying assembly 7 is installed in the outer shell 1, and the conveying assembly 7 is used to convey the welding wire. The conveying assembly 7 includes a base 701 fixedly installed in the outer shell 1, and the base 701 can conveniently support pulley one 702, top frame 703 and motor two 705. Two pulleys one 702 and a top frame 703 are symmetrically installed on the base 701. Pulley one 702 can support the welding wire, and the top frame 703 can support pulley two 704. Each top frame 703 is fixedly provided with pulley two 704 located above pulley one 702, and pulley two 704 can be used in conjunction with pulley one 702 to convey the welding wire. Two motors two 705 are symmetrically installed on the side wall of the base 701, and motor two 705 can drive pulley one 702 to rotate, and the output shafts of the two motors two 705 are fixedly connected to the side walls of the two pulleys one 702 respectively.

[0039] The welding wire is passed between pulley one 702 and pulley two 704, and the top frame 703 can pressurize pulley two 704 downward. Pulley one 702 is limited and supported by the base 701, and pulley two 704 can squeeze the welding wire on pulley one 702, which can increase the friction between the welding wire and pulley one 702 and pulley two 704. By starting two motors two 705 at the same time, the start of motor two 705 can drive the two pulleys one 702 to rotate synchronously, and the rotation of pulley one 702 can drive the welding wire to move. The movement of the welding wire can also drive pulley two 704 to rotate, which can facilitate the transportation of the welding wire.

[0040] like Figure 1 and Figure 6-7As shown, a support assembly 8 is installed in the outer shell 1, and the support assembly 8 is used for retracting and releasing the welding wire. The support assembly 8 includes a support transverse axis 801 fixedly connected to the inner side wall of the outer shell 1, and the support transverse axis 801 can support a turntable 802. A turntable 802 is sleeved on the support transverse axis 801 and a screw hole 9 is opened at the end. The turntable 802 can be convenient for winding the welding wire, and the screw hole 9 can be conveniently connected to the bolt 803. The screw hole 9 is threadedly connected with the bolt 803, and the bolt 803 can be connected to the screw hole 9. A handle 804 located on one side of the turntable 802 is fixedly installed on the bolt 803, and the rotation of the handle 804 can drive the bolt 803 to rotate.

[0041] By turning the handle 804, the bolt 803 is driven to rotate, and the bolt 803 can be pulled out from the screw hole 9, and the turntable 802 wrapped with the welding wire is mounted on the supporting horizontal axis 801. Then, by aligning the bolt 803 with the screw hole 9, the handle 804 is turned to drive the bolt 803 to rotate, and the bolt 803 can be inserted into the screw hole 9. The screw hole 9 and the bolt 803 are fixed, which can drive the supporting horizontal axis 801 and the handle 804 to be fixed. The handle 804 can limit the turntable 802 to prevent the turntable 802 from detaching from the supporting horizontal axis 801.

[0042] like Figure 6-7 As shown, a joint 10 is fixedly mounted on the side wall of the outer shell 1, and the joint 10 can be connected to a pipeline for conveying welding wire.

[0043] like Figure 1-3 As shown, a support leg 11 is fixedly installed below the outer shell 1 , and the support leg 11 can support the outer shell 1 .

[0044] A method for pre-processing a test specimen comprises the following steps:

[0045] Step 1: After the welding wire is passed through the two clamping plates 304, the clamping plates 304 connected thereto are driven to clamp and squeeze the welding wire by starting the second telescopic rod 305, the motor 1 301 is started to drive the gear 302 to rotate, the gear 302 rotates through the tooth groove 5 to drive the rotating shaft 303 to rotate, the rotating shaft 303 rotates through the second telescopic rod 305 to drive the clamping plates 304 to rotate, the clamping plates 304 squeeze and rotate around the welding wire, and at the same time, the heating wire 306 is started to heat the welding wire through the clamping plates 304, so that the welding wire can be clamped straight;

[0046] Step 2: The telescopic rod 1 202 is started to drive the slide plate 203 to move, the slide plate 203 drives the limit frame 204 to move, the limit frame 204 drives the clamping plate 304 to move through the rotating shaft 303 and the telescopic rod 2 305, and the clamping plate 304 moves synchronously with the moving welding wire;

[0047] Step 3: The welding wire is passed between the two limiting wheels 602. By starting the two-way push rod 603, the bearings 604 on both sides are driven to approach each other. The bearings 604 on both sides respectively drive the limiting wheels 602 on both sides to approach the welding wire at the same time. The gap between the two limiting wheels 602 is at the same height as the gap between the upper and lower clamping plates 304. The welding wire between the two limiting wheels 602 enters horizontally between the two clamping plates 304.

[0048] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. A variable speed wire feeder for a digital welding machine, characterized in that: The invention comprises an outer shell (1), a reset power assembly (2) and a straightening assembly (3), wherein the reset power assembly (2) and the straightening assembly (3) are installed in the outer shell (1), the reset power assembly (2) comprises a slide rail (201) fixedly installed on the inner bottom surface of the outer shell (1) and a telescopic rod (202), the telescopic rod (202) is installed in the slide rail (201) and a slide plate (203) is fixedly installed on the telescopic end, the slide rail (201) is provided with a slide groove (4) sleeved on the outside of the slide plate (203), the slide plate (203) is symmetrically installed with two limit frames (204), and the straightening assembly (3) comprises a symmetrically installed The invention relates to two straightening structures, wherein the straightening structures include a motor 1 (301) fixedly mounted inside the limiting frame (204) and a gear (302) and a rotating shaft (303) penetrating inside the limiting frame (204); a tooth groove (5) is provided on the rotating shaft (303); the gear (302) is fixedly connected to the output shaft of the motor 1 (301) and meshes with the tooth groove (5); two clamping plates (304) are symmetrically mounted inside the rotating shaft (303); each of the clamping plates (304) is fixedly mounted with a telescopic rod 2 (305) fixedly connected to the rotating shaft (303); and each of the clamping plates (304) is mounted with a heating wire (306).

2. A variable speed wire feeder for a digital welding machine as claimed in claim 1, characterized in that: A limiting component (6) is arranged inside the outer shell (1), and the limiting component (6) is used to limit the position of the welding wire.

3. A variable speed wire feeder for a digital welding machine as claimed in claim 2, characterized in that: The limiting assembly (6) comprises a bracket (601) fixedly connected to the slide rail (201) and two symmetrically arranged limiting wheels (602); a bidirectional push rod (603) is fixedly arranged on the bracket (601); and bearings (604) are fixedly arranged at both telescopic ends of the bidirectional push rod (603) and are respectively penetrated through the two limiting wheels (602).

4. A variable speed wire feeder for a digital welding machine as claimed in claim 3, characterized in that: A conveying assembly (7) is arranged inside the outer shell (1), and the conveying assembly (7) is used for conveying welding wire.

5. A variable speed wire feeder for a digital welding machine as claimed in claim 4, characterized in that: The conveying assembly (7) comprises a base (701) fixedly mounted in the outer shell (1); two pulleys (702) and a top frame (703) are symmetrically mounted on the base (701); each of the top frames (703) is fixedly mounted with a pulley (704) located above the pulley (702); two motors (705) are symmetrically mounted on the side walls of the base (701); the output shafts of the two motors (705) are respectively fixedly connected to the side walls of the two pulleys (702).

6. A variable speed wire feeder for a digital welding machine as claimed in claim 5, characterized in that: A support assembly (8) is installed in the outer shell (1), and the support assembly (8) is used for retracting and releasing welding wire.

7. A variable speed wire feeder for a digital welding machine as claimed in claim 6, characterized in that: The support assembly (8) comprises a support transverse shaft (801) fixedly connected to the inner side wall of the outer shell (1); a turntable (802) is sleeved on the support transverse shaft (801) and a screw hole (9) is opened at the end thereof; a bolt (803) is threadedly connected to the inner thread of the screw hole (9); a handle (804) located on one side of the turntable (802) is fixedly mounted on the bolt (803).

8. A variable speed wire feeder for a digital welding machine as claimed in claim 7, characterized in that: A joint (10) is fixedly mounted on the side wall of the outer shell (1).

9. A variable speed wire feeder for a digital welding machine as claimed in claim 8, characterized in that: A supporting leg (11) is fixedly mounted below the outer shell (1).

10. The method for using a variable speed wire feeder of a digital welding machine according to any one of claim 3, characterized in that: The following steps are involved: Step 1: After the welding wire is inserted into the two clamping plates (304), the clamping plates (304) connected thereto are driven to clamp and extrude the welding wire by starting the second telescopic rod (305), the first motor (301) is started to drive the gear (302) to rotate, the gear (302) rotates through the tooth groove (5) to drive the rotating shaft (303) to rotate, the rotating shaft (303) rotates through the second telescopic rod (305) to drive the clamping plates (304), the clamping plates (304) squeeze and rotate around the welding wire, and at the same time the heating wire (306) is started to heat the welding wire through the clamping plates (304), so that the welding wire can be clamped straight; Step 2: the telescopic rod 1 (202) is started to drive the slide plate (203) to move, the slide plate (203) drives the limiting frame (204) to move, the limiting frame (204) drives the clamping plate (304) to move through the rotating shaft (303) and the telescopic rod 2 (305), and the clamping plate (304) moves synchronously with the moving welding wire; Step three: The welding wire is passed through between the two limiting wheels (602), and the bearings (604) on both sides are driven to approach each other by starting the two-way push rod (603). The bearings (604) on both sides respectively drive the limiting wheels (602) on both sides to approach the welding wire at the same time. The gap between the two limiting wheels (602) and the gap between the upper and lower clamping plates (304) are at the same height, and the welding wire between the two limiting wheels (602) enters horizontally between the two clamping plates (304).

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