Metal wire feeding mechanism for electric arc additive material

Abstract

The invention discloses a metal wire feeding mechanism for electric arc material increase, and belongs to the field of material increase equipment. The mechanism comprises a straightening box, two sets of straightening wheels are rotationally connected into the straightening box, one set of straightening wheels are transversely arranged, the other set of straightening wheels are longitudinally arranged, worm wheels are connected to the two sets of straightening wheels, two rotating shafts are rotationally connected into the straightening box, and two sets of worms meshed with the two sets of worm wheels are arranged on the two rotating shafts. Clamping blocks matched with the two sets of worms are radially and slidably connected to the side walls of the two rotating shafts, first wedge blocks are connected to the clamping blocks, sliding rods are slidably connected to the interiors of the two rotating shafts, a second wedge block is connected to the position, close to the wire inlet end, of one sliding rod, and a third wedge block is connected to the position, close to the wire outlet end, of the other sliding rod; second wedge blocks and third wedge blocks are arranged on the two sides, away from the wire inlet end and the wire outlet end, of the first wedge blocks, of the two sliding rods. The mechanism can adjust the tensioning degree of the metal wire in the straightening process.

Description

Technical Field

[0001] The present invention relates to the technical field of material adding equipment, and in particular to a metal wire feeding mechanism for arc material adding. Background Art

[0002] As arc additive manufacturing technology is booming, the performance of the wire feeding mechanism, as a key component, plays a decisive role in the quality and efficiency of additive manufacturing.

[0003] With the growing demand for complex metal parts in industrial production, arc additive manufacturing has gradually emerged in many fields such as aerospace, automobile manufacturing, and mold processing, thanks to its ability to quickly and accurately manufacture customized metal parts. In this process, metal wire, as the raw material for additive manufacturing, its feeding stability and accuracy are crucial. However, the existing wire feeding mechanism faces many challenges.

[0004] During the feeding process, the wire tension is very likely to be unstable due to various factors, such as fluctuations in wire feeding speed and uneven friction inside the equipment. When the wire tension is too high, it may not only cause the wire to break during the straightening process, affecting the continuity of additive manufacturing, but also cause residual stress inside the straightened wire, reducing the quality of the final product; and when the wire tension is too low, the wire is prone to loosening, entanglement and other problems, resulting in unsmooth feeding, making it difficult to ensure that the wire is accurately delivered to the welding head during additive manufacturing, thus affecting the forming accuracy of the parts. Summary of the invention

[0005] The object of the present invention is to provide a metal wire feeding mechanism for arc material addition, which solves the problem that the tension of the metal wire in the straightening part of the existing wire feeding mechanism is difficult to adjust.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A metal wire feeding mechanism for arc material addition, comprising a straightening box, wherein two groups of straightening wheels are rotatably connected in the straightening box, one group of straightening wheels is arranged horizontally, and the other group of straightening wheels is arranged longitudinally, and both groups of straightening wheels are connected to worm gears, and two rotating shafts are rotatably connected in the straightening box, and two groups of worms meshing with the two groups of worm gears are arranged on the two rotating shafts;

[0007] The worm gear near the wire feeding end continues to rotate, and the other worm gears stop rotating to loosen the wire, and the worm gear near the wire outlet end continues to rotate, and the other worm gears stop rotating to tighten the wire.

[0008] Preferably, a clamping block cooperating with the two groups of worm gears is radially slidably connected on the side walls of the two rotating shafts, a first wedge block is connected to the clamping block, and sliding rods are slidably connected in the two rotating shafts, one of the sliding rods is connected to a second wedge block near the wire feeding end, and the other sliding rod is connected to a third wedge block near the wire outlet end, and the second wedge block and the third wedge block are arranged on both sides of the two sliding rods away from the wire feeding end and the wire outlet end.

[0009] When the two sliding rods slide synchronously toward the wire outlet end, multiple second wedge blocks are away from the first wedge block, and multiple third wedge blocks are close to the first wedge block, so that the block close to the wire outlet end maintains abutting against the inner wall of the worm, and the remaining blocks are away from the inner wall of the worm to loosen the metal wire, and, when the two sliding rods slide synchronously toward the wire outlet end, multiple third wedge blocks are away from the first wedge block, and multiple second wedge blocks are close to the first wedge block, so that the block close to the wire outlet end maintains abutting against the inner wall of the worm, and the remaining blocks are away from the inner wall of the worm to tighten the metal wire.

[0010] Preferably, a swing frame is hingedly connected to the lower part of the wire outlet section of the straightening box, and a detection wheel is rotatably connected to the swing frame. The metal wire is driven by the detection wheel. When the swing frame swings down, the two slide bars slide synchronously toward the wire outlet end, and when the swing frame swings up, the two slide bars slide synchronously toward the wire inlet end.

[0011] A mounting block is fixedly connected to the straightening box, a rotating shaft of the swing frame is rotatably connected to the mounting block, and a torsion spring is connected between the rotating shaft and the mounting block.

[0012] Preferably, the straightening box is fixedly connected to an electric telescopic rod, the output end of the electric telescopic rod is fixedly connected to a connecting plate, and the two sliding rods are fixedly connected to the connecting plate;

[0013] A first switch for controlling the shortening of the electric telescopic rod and a second switch for controlling the lengthening of the electric telescopic rod are respectively arranged on the mounting block in the downward and upward swinging directions of the swing frame. The first switch can be pressed when the swing frame swings downward, and the second switch can be pressed when the swing frame swings upward.

[0014] Preferably, it also includes a wire feeding frame, on which a wire feeding roller is rotatably connected, and a first motor is arranged on the wire feeding frame, and an output end of the first motor is connected to the roller shaft of the wire feeding roller.

[0015] Preferably, the output end of the first motor is connected to a conical column, the end of the roller shaft is connected to a conical ring, and when the conical column abuts against the inner conical surface of the conical ring, the first motor drives the wire feeding roller to rotate.

[0016] Preferably, the wire feeding frame is fixedly connected to a mounting frame, the mounting frame is fixedly connected to a first passive cylinder, an output end of the first passive cylinder is connected to a rack, and a gear ring meshing with the rack is connected to the roller shaft via a one-way bearing;

[0017] A first active cylinder is fixedly connected to the straightening box, a first air pipe is connected between the first active cylinder and the first passive cylinder, a convex plate is provided on the side of the connecting plate, the output end of the first active cylinder is hung on the convex plate, when the connecting plate moves toward the wire outlet end, the convex plate pulls the first active cylinder to extend, so that the first passive cylinder is shortened, so that the rack drives the wire feeding roller to rotate instantly through the gear ring, thereby further releasing the metal wire.

[0018] Preferably, a tension spring is connected in the cylinder body of the first active cylinder, and the tension spring is connected to the cylinder rod of the first active cylinder.

[0019] Preferably, a base is slidably connected to the mounting frame, the first motor is fixedly connected to the base, a second passive cylinder is fixedly connected between the base and the wire feeding frame, a second active cylinder is fixedly connected to the straightening box, a second air pipe is connected between the second active cylinder and the second passive cylinder, and when the connecting plate moves toward the direction of the first motor, the connecting plate pushes the second active cylinder to shorten, so that the second passive cylinder extends, so that the cone column moves away from the cone ring, so that the wire feeding roller stops rotating.

[0020] Preferably, a first locking ring is fixedly connected to the cylinder body of the second passive cylinder, and a second locking ring is provided on the outer wall of the cone ring, and when the first motor is away from the cone ring, the first locking ring abuts against the second locking ring to lock the wire feeding roller;

[0021] A guide rod is fixedly connected to the base, the guide rod is plugged into the mounting frame, and a spring is sleeved on the guide rod, and two ends of the spring are respectively abutted against the base and the mounting frame.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] When the tension of the metal wire is too large, the two slide bars of the present invention slide toward the wire outlet end synchronously. At this time, the plurality of third wedge blocks approach and squeeze the first wedge block, so that the block connected to the first wedge block slides toward the inner direction of the rotating shaft. Except for the block closest to the wire feeding end, the rest are retracted into the rotating shaft, and the two straightening wheels that cooperate with each other near the wire feeding end continue to rotate, while the rest of the straightening wheels stop rotating. The straightening wheel at the wire feeding end feeds the metal wire into the straightening box, so that the total length of the metal wire in the straightening box increases, thereby avoiding excessive tightening of the metal wire in the straightening box; if the tension of the metal wire is too small, the two slide bars slide toward the wire feeding end synchronously. Since the end of the slide bar closest to the wire outlet end does not have the second wedge block, only the two straightening wheels that cooperate with each other closest to the wire outlet end continue to rotate, while the rest of the straightening wheels stop rotating. At this time, the straightening wheel at the wire outlet end tightens the metal wire in the straightening box. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the straightening box of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the card block of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the conveying roller of the present invention;

[0028] Figure 5 It is a structural schematic diagram of the L-shaped frame of the present invention;

[0029] Figure 6 It is a structural schematic diagram of the gear ring of the present invention;

[0030] Figure 7 It is a schematic diagram of the structure of the detection wheel of the present invention.

[0031] In the figure: 1, straightening box; 11, rotating shaft; 12, worm; 13, rotating rod; 14, worm wheel; 15, straightening wheel; 16, driven wheel; 17, second motor; 18, driving wheel; 2, connecting plate; 21, sliding rod; 22, second wedge block; 23, third wedge block; 24, clamping block; 25, first wedge block; 3, wire feeding frame; 31, wire feeding roller; 32, roller shaft; 33, cone ring; 34, gear ring; 35, first motor; 36, cone column; 4, electric telescopic rod; 4 1. L-shaped frame; 42. first active cylinder; 421. first air pipe; 43. second active cylinder; 431. second air pipe; 44. first passive cylinder; 441. rack; 45. second passive cylinder; 451. first locking ring; 452. second locking ring; 46. base; 47. guide rod; 48. spring; 49. mounting frame; 5. mounting block; 51. swing frame; 52. detection wheel; 53. torsion spring; 54. first switch; 55. second switch. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Reference Figure 1-Figure 7The present embodiment provides a technical solution: a metal wire feeding mechanism for electric arc material addition, comprising a straightening box 1, wherein two groups of straightening wheels 15 are rotatably connected in the straightening box 1, wherein one group of straightening wheels 15 is arranged horizontally, and the other group of straightening wheels 15 is arranged longitudinally, and both groups of straightening wheels 15 are connected with worm gears 14, and two rotating shafts 11 are rotatably connected in the straightening box 1, and two groups of worms 12 meshing with the two groups of worm gears 14 are arranged on the two rotating shafts 11; a clamping block 24 cooperating with the two groups of worms 12 is radially slidably connected on the side walls of the two rotating shafts 11, and a first wedge block 25 is connected to the clamping block 24, and sliding rods 21 are slidably connected in the two rotating shafts 11, wherein one of the sliding rods 21 is connected with a second wedge block 22 near the wire feeding end, and the other sliding rod 21 is connected with a third wedge block 25 near the wire outlet end. Wedge block 23, second wedge blocks 22 and third wedge blocks 23 are arranged on both sides of multiple first wedge blocks 25 at the two sliding rods 21 away from the wire feeding end and the wire outlet end; when the two sliding rods 21 slide toward the wire outlet end synchronously, multiple second wedge blocks 22 are away from the first wedge block 25, and multiple third wedge blocks 23 are close to the first wedge block 25, so that the block 24 close to the wire feeding end maintains the state of abutting the inner wall of the worm 12, and the remaining blocks 24 are away from the inner wall of the worm 12 to loosen the metal wire, and, when the two sliding rods 21 slide toward the wire feeding end synchronously, multiple third wedge blocks 23 are away from the first wedge block 25, and multiple second wedge blocks 22 are close to the first wedge block 25, so that the block 24 close to the wire outlet end maintains the state of abutting the inner wall of the worm 12, and the remaining blocks 24 are away from the inner wall of the worm 12 to tighten the metal wire.

[0034] The metal wire enters the straightening box 1 through the wire inlet end thereof, and is straightened by two sets of straightening wheels 15 arranged horizontally and vertically. The straightened metal wire is released through the wire outlet end of the straightening box 1, and then is sent to the welding head through the wire feeding wheel of the equipment for use. During the wire feeding process, if the wire tension is too large, the two slide bars 21 slide synchronously toward the wire outlet end. At this time, the plurality of third wedge blocks 23 all approach and squeeze the first wedge block 25, so that the block 24 connected to the first wedge block 25 moves toward the inner side of the rotating shaft 11. The end of the slide bar 21 closest to the wire outlet does not have the third wedge block 23, so that except for the block 24 closest to the wire inlet end, the rest are retracted into the rotating shaft 11, that is, the two straightening wheels 15 that cooperate with each other near the wire inlet end continue to rotate, and the rotation speed of the other straightening wheels 15 is reduced or stopped, and the straightening wheel 15 at the wire inlet end feeds the metal wire into the straightening box 1, so that the total length of the metal wire in the straightening box 1 is increased, thereby avoiding the metal wire in the straightening box 1 from being too tight;

[0035] If the wire tension is too small, the two slide bars 21 will slide synchronously toward the wire feeding end. Since the end of the slide bar 21 closest to the wire outlet does not have the second wedge 22, only the two straightening wheels 15 that cooperate with each other closest to the wire outlet continue to rotate, and the other straightening wheels 15 stop rotating. At this time, the straightening wheel 15 at the wire outlet tightens the wire in the straightening box 1.

[0036] The worm 12 is arranged in sections, and the straightening wheels 15 are symmetrically arranged on both sides of the worm 12. The straightening wheels 15 are fixedly connected to the worm wheels 14 through the rotating rod 13. The multi-section worm 12 is arranged corresponding to every two symmetrically arranged worm wheels 14. When the worm 12 rotates, the worm wheels 14 on both sides thereof are driven to rotate synchronously and in the opposite direction.

[0037] The contact part between the straightening wheel 15 and the metal wire is smooth, so when the straightening wheel 15 at the wire inlet continues to rotate to feed the metal wire into the straightening box 1, the wire outlet exerts a pulling force on the metal wire so that the metal wire entering the straightening box 1 can be straightened without being too tight. When the straightening wheel 15 at the wire outlet continues to rotate and the other straightening wheels 15 stop rotating, the straightening wheel 15 at the wire outlet can further pull the metal wire so that the metal wire in the straightening box 1 is tightened.

[0038] There is magnetic attraction between the block 24 and the inner wall of the worm 12, so that after the second wedge block 22 or the third wedge block 23 moves away from the first wedge block 25, the block 24 can be magnetically attracted to the inner wall of the worm 12, and the contact parts between the block 24 and the worm 12 are provided with anti-slip grooves to ensure the stability of the transmission. When the remaining blocks 24 move away from the worm 12, the reduced magnetic attraction between the two causes the rotating shaft 11 to drive the remaining worms 12 to rotate slowly or not rotate, thereby reducing the friction of the metal wire.

[0039] The ends of the two rotating shafts 11 are connected to driven wheels 16 , and the second motor 17 drives the two driven wheels 16 to rotate through the driving wheel 18 , so that the two rotating shafts 11 rotate synchronously.

[0040] A swing frame 51 is hingedly connected to the lower part of the wire outlet section of the straightening box 1, and a detection wheel 52 is rotatably connected to the swing frame 51. The metal wire is transmitted to the detection wheel 52. When the swing frame 51 swings down, the two slide bars 21 slide synchronously toward the wire outlet end, and when the swing frame 51 swings up, the two slide bars 21 slide synchronously toward the wire inlet end.

[0041] The metal wire is overlapped on the detection wheel 52 , and the portion where the metal wire is overlapped on the detection wheel 52 has an angle instead of extending in a straight line to the wire feeding wheel, so that the tightening and loosening of the metal wire can affect the swing of the swing frame 51 .

[0042] A mounting block 5 is fixedly connected to the straightening box 1 , a rotating shaft of the swing frame 51 is rotatably connected to the mounting block 5 , and a torsion spring 53 is connected between the rotating shaft and the mounting block 5 .

[0043] The torsion spring 53 applies a positioning force to the swing frame 51, and applies a restoring force for the swing frame 51 to swing upward after the swing frame 51 swings downward, and vice versa for the restoring force for swinging downward. When the wire tension is too large, it will exert pressure on the detection wheel 52, causing the swing frame 51 to swing downward, and vice versa when the swing frame 51 swings upward.

[0044] An electric telescopic rod 4 is fixedly connected to the straightening box 1. The output end of the electric telescopic rod 4 is fixedly connected to a connecting plate 2, and two sliding rods 21 are both fixedly connected to the connecting plate 2; on the mounting block 5, a first switch 54 for controlling the shortening of the electric telescopic rod 4 and a second switch 55 for controlling the elongation of the electric telescopic rod 4 are respectively arranged in the directions of the swing frame 51 swinging downward and upward. When the swing frame 51 swings downward, it can press the first switch 54, and when the swing frame 51 swings upward, it can press the second switch 55.

[0045] The two sliding rods 21 are driven by the same electric telescopic rod 4 to slide. When the wire tension is too large, it will exert pressure on the detection wheel 52. At this time, the detection wheel 52 drives the swing frame 51 to swing downward. When the swing angle of the swing frame 51 reaches the set limit, it can press the first switch 54. At this time, the first switch 54 controls the electric telescopic rod 4 to shorten, thereby driving the sliding rod 21 to slide towards the wire outlet end to loosen the wire. On the contrary, when the wire is too loose, the torsion spring 53 drives the swing frame 51 to swing upward. At this time, the swing frame 51 can squeeze the second switch 55, and the second switch 55 controls the electric telescopic rod 4 to elongate, thereby driving the sliding rod 21 to slide towards the wire inlet end to tighten the wire.

[0046] It further includes a wire feeding frame 3. A wire feeding roller 31 is rotatably connected to the wire feeding frame 3, and a first motor 35 is arranged on the wire feeding frame 3. The output end of the first motor 35 is connected to the roller shaft 32 of the wire feeding roller 31.

[0047] When the first motor 35 is started, it drives the wire feeding roller 31 to rotate and release the wire. The rotation speed of the first motor 35 is coordinated with the rotation speed of the wire feeding wheel, so that the wire tends to be in a state of uniform tension.

[0048] The output end of the first motor 35 is connected with a tapered column 36, and the end of the roller shaft 32 is connected with a tapered ring 33. When the tapered column 36 abuts against the inner tapered surface of the tapered ring 33, the first motor 35 drives the wire feeding roller 31 to rotate.

[0049] The tapered column 36 is inserted into the tapered ring 33, and the outer tapered surface of the tapered column 36 is closely attached to the inner tapered surface of the tapered ring 33. When the first motor 35 is started, it drives the tapered column 36 to rotate, and the tapered column 36 drives the wire feeding roller 31 to rotate through the friction force with the tapered ring 33.

[0050] A mounting frame 49 is fixedly connected to the wire feeding frame 3, a first passive cylinder 44 is fixedly connected to the mounting frame 49, an output end of the first passive cylinder 44 is connected to a rack 441, a gear ring 34 meshing with the rack 441 is connected to the roller shaft 32 via a one-way bearing; a first active cylinder 42 is fixedly connected to the straightening box 1, a first air pipe 421 is connected between the first active cylinder 42 and the first passive cylinder 44, a convex plate is provided on the side of the connecting plate 2, the output end of the first active cylinder 42 is hung on the convex plate, when the connecting plate 2 moves toward the wire outlet end, the convex plate pulls the first active cylinder 42 to extend, causing the first passive cylinder 44 to shorten, so that the rack 441 drives the wire feeding roller 31 to rotate instantly through the gear ring 34, thereby further releasing the metal wire.

[0051] An L-shaped frame 41 is fixedly connected to the outside of the straightening box 1 , and the first active cylinder 42 and the second active cylinder 43 are both fixedly connected to the L-shaped frame 41 .

[0052] When the electric telescopic rod 4 drives the connecting plate 2 to move toward the wire outlet end, the convex plate on the connecting plate 2 pulls the first active cylinder 42 to extend, so that the air in the first passive cylinder 44 is extracted. At this time, the first passive cylinder 44 is shortened, thereby driving the rack 441 to slide down, driving the gear ring 34 to rotate in the same direction as the first motor 35, and at this time, the rotation speed of the gear ring 34 is slightly greater than the rotation speed of the first motor 35. At this time, the release speed of the wire feeding roller 31 increases instantaneously and then recovers, so that the release amount of the metal wire increases slightly, thereby relieving the taut metal wire;

[0053] The cylinder rod end of the first active cylinder 42 is connected to the convex plate on the circular plate connecting plate 2 and is hung on the circular plate, and the connecting plate 2 will drive the first active cylinder 42 to extend only when it moves toward the wire outlet end, otherwise the convex plate will move away from the circular plate.

[0054] A tension spring is connected in the cylinder body of the first active cylinder 42 , and the tension spring is connected to the cylinder rod of the first active cylinder 42 .

[0055] The setting of the tension spring makes it possible for the electric telescopic rod 4 to drive the connecting plate 2 to return to its original position, and then the tension spring pulls the cylinder rod of the first active cylinder 42 to slide into its cylinder body, so that the first active cylinder 42 is shortened and the first passive cylinder 44 is extended, so that the rack 441 moves up and resets, and at this time the gear ring 34 is driven to rotate in the opposite direction to the wire feeding roller 31.

[0056] A base 46 is slidably connected to the mounting frame 49, the first motor 35 is fixedly connected to the base 46, a second passive cylinder 45 is fixedly connected between the base 46 and the wire feeding frame 3, a second active cylinder 43 is fixedly connected to the straightening box 1, a second air pipe 431 is connected between the second active cylinder 43 and the second passive cylinder 45, when the connecting plate 2 moves toward the direction of the first motor 35, the connecting plate 2 pushes the second active cylinder 43 to shorten, so that the second passive cylinder 45 extends, so that the cone column 36 moves away from the cone ring 33, so that the wire feeding roller 31 stops rotating.

[0057] After the metal wire is relaxed, the electric telescopic rod 4 drives the connecting plate 2 to move toward the first motor 35. At this time, the connecting plate 2 presses the second active cylinder 43, so that the gas in the second active cylinder 43 enters the second passive cylinder 45. At this time, the second passive cylinder 45 extends, so that the first motor 35 is away from the wire feeding roller 31, and the cone column 36 is away from the cone ring 33. At this time, the first motor 35 no longer drives the wire feeding roller 31 to rotate, so that the straightening wheel 15 that continues to rotate at the wire outlet end can tighten the metal wire.

[0058] A first locking ring 451 is fixedly connected to the cylinder body of the second passive cylinder 45, and a second locking ring 452 is provided on the outer wall of the cone ring 33. When the first motor 35 is away from the cone ring 33, the first locking ring 451 abuts against the second locking ring 452 to lock the wire feeding roller 31; a guide rod 47 is fixedly connected to the base 46, the guide rod 47 is inserted into the mounting frame 49, and a spring 48 is sleeved on the guide rod 47, and both ends of the spring 48 abut against the base 46 and the mounting frame 49 respectively.

[0059] When the second passive cylinder 45 is extended, the first locking ring 451 on its cylinder body can abut against the second locking ring 452 on the cone ring 33, so that the wire feed roller 31 is locked and no longer rotates, and the spring 48 is in a compressed state at this time. The electric telescopic rod 4 is quickly shortened immediately after being extended, so that the second active cylinder 43 is no longer compressed, and the elastic force of the spring 48 is released, so that the second passive cylinder 45 is shortened, and the cone column 36 is re-engaged in the cone ring 33, and the wire feed roller 31 continues to be driven to release the metal wire;

[0060] In the process of tightening the metal wire, after the control system obtains the shortening signal of the electric telescopic rod 4, it controls the wire feeding wheel to slightly increase the speed and then recover, so that the metal wire between the wire feeding wheel and the detection wheel 52 is tightened.

[0061] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wire feeding mechanism for arc material addition, comprising a straightening box (1), characterized in that: Two groups of straightening wheels (15) are rotatably connected in the straightening box (1), one group of straightening wheels (15) is arranged horizontally, and the other group of straightening wheels (15) is arranged longitudinally, and both groups of straightening wheels (15) are connected to worm gears (14). Two rotating shafts (11) are rotatably connected in the straightening box (1), and two groups of worms (12) meshing with the two groups of worm gears (14) are arranged on the two rotating shafts (11); The worm (12) near the wire feeding end continues to rotate, and the other worms (12) stop rotating to loosen the wire; and the worm (12) near the wire outlet end continues to rotate, and the other worms (12) stop rotating to tighten the wire.

2. The metal wire feeding mechanism for arc material addition according to claim 1, characterized in that: A block (24) cooperating with the two groups of worm gears (12) is radially slidably connected on the side walls of the two rotating shafts (11), and a first wedge block (25) is connected to the block (24). Slide rods (21) are slidably connected inside the two rotating shafts (11), one of the slide rods (21) is connected to a second wedge block (22) near the wire feeding end, and the other slide rod (21) is connected to a third wedge block (23) near the wire outlet end. The second wedge block (22) and the third wedge block (23) are arranged on both sides of the two slide rods (21) away from the wire feeding end and the wire outlet end. When the two slide bars (21) slide synchronously toward the wire-out end, a plurality of the second wedge blocks (22) are all away from the first wedge block (25), and a plurality of the third wedge blocks (23) are all close to the first wedge block (25), so that the block (24) close to the wire-in end maintains abutting against the inner wall of the worm gear (12), and the remaining blocks (24) are away from the inner wall of the worm gear (12) to loosen the metal wire; and when the two slide bars (21) slide synchronously toward the wire-in end, a plurality of the third wedge blocks (23) are all away from the first wedge block (25), and a plurality of the second wedge blocks (22) are all close to the first wedge block (25), so that the block (24) close to the wire-out end maintains abutting against the inner wall of the worm gear (12), and the remaining blocks (24) are away from the inner wall of the worm gear (12) to tighten the metal wire.

3. The metal wire feeding mechanism for arc material addition according to claim 2, characterized in that: The lower part of the wire outlet section of the straightening box (1) is hinged with a swing frame (51), and a detection wheel (52) is rotatably connected to the swing frame (51). The metal wire is driven by the detection wheel (52). When the swing frame (51) swings down, the two slide bars (21) slide synchronously toward the wire outlet end, and when the swing frame (51) swings up, the two slide bars (21) slide synchronously toward the wire inlet end. A mounting block (5) is fixedly connected to the straightening box (1), a rotating shaft of the swing frame (51) is rotatably connected to the mounting block (5), and a torsion spring (53) is connected between the rotating shaft and the mounting block (5).

4. The metal wire feeding mechanism for arc material addition according to claim 3, characterized in that: The straightening box (1) is fixedly connected to an electric telescopic rod (4), the output end of the electric telescopic rod (4) is fixedly connected to a connecting plate (2), and the two sliding rods (21) are fixedly connected to the connecting plate (2); A first switch (54) for controlling the shortening of the electric telescopic rod (4) and a second switch (55) for controlling the extension of the electric telescopic rod (4) are respectively arranged on the mounting block (5) in the downward and upward swinging directions of the swing frame (51); the first switch (54) can be pressed when the swing frame (51) swings downward, and the second switch (55) can be pressed when the swing frame (51) swings upward.

5. The metal wire feeding mechanism for arc material addition according to claim 4, characterized in that: It also comprises a wire feeding frame (3), to which a wire feeding roller (31) is rotatably connected, and a first motor (35) is arranged on the wire feeding frame (3), wherein the output end of the first motor (35) is connected to the roller shaft (32) of the wire feeding roller (31).

6. The metal wire feeding mechanism for arc material addition according to claim 5, characterized in that: The output end of the first motor (35) is connected to a cone column (36), the end of the roller shaft (32) is connected to a cone ring (33), and when the cone column (36) abuts against the inner cone surface of the cone ring (33), the first motor (35) drives the wire feeding roller (31) to rotate.

7. The metal wire feeding mechanism for arc material addition according to claim 6, characterized in that: The wire feeding frame (3) is fixedly connected to a mounting frame (49), the mounting frame (49) is fixedly connected to a first passive cylinder (44), an output end of the first passive cylinder (44) is connected to a rack (441), and a gear ring (34) meshing with the rack (441) is connected to the roller shaft (32) via a one-way bearing; A first active cylinder (42) is fixedly connected to the straightening box (1); a first air pipe (421) is connected between the first active cylinder (42) and the first passive cylinder (44); a convex plate is provided on the side of the connecting plate (2); an output end of the first active cylinder (42) is hung on the convex plate; when the connecting plate (2) moves toward the wire outlet end, the convex plate pulls the first active cylinder (42) to extend, so that the first passive cylinder (44) shortens, so that the rack (441) drives the wire feeding roller (31) to rotate instantly through the gear ring (34), thereby further releasing the metal wire.

8. The metal wire feeding mechanism for arc material addition according to claim 7, characterized in that: A tension spring is connected in the cylinder body of the first active cylinder (42), and the tension spring is connected to the cylinder rod of the first active cylinder (42).

9. The metal wire feeding mechanism for arc material addition according to claim 8, characterized in that: The mounting frame (49) is slidably connected to a base (46), the first motor (35) is fixedly connected to the base (46), a second passive cylinder (45) is fixedly connected between the base (46) and the wire feeding frame (3), a second active cylinder (43) is fixedly connected to the straightening box (1), a second air pipe (431) is connected between the second active cylinder (43) and the second passive cylinder (45), and when the connecting plate (2) moves toward the direction of the first motor (35), the connecting plate (2) pushes the second active cylinder (43) to shorten, so that the second passive cylinder (45) extends, so that the cone column (36) moves away from the cone ring (33), so that the wire feeding roller (31) stops rotating.

10. The metal wire feeding mechanism for arc material addition according to claim 9, characterized in that: A first locking ring (451) is fixedly connected to the cylinder body of the second passive cylinder (45), and a second locking ring (452) is arranged on the outer wall of the cone ring (33); when the first motor (35) is away from the cone ring (33), the first locking ring (451) abuts against the second locking ring (452) to lock the wire feeding roller (31); A guide rod (47) is fixedly connected to the base (46), the guide rod (47) is plugged into the mounting frame (49), and a spring (48) is sleeved on the guide rod (47), with two ends of the spring (48) respectively abutting against the base (46) and the mounting frame (49).

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