An automatic wire feeding device for arc welding on a CNC lathe

Abstract

This invention relates to the field of arc welding technology, and discloses an automatic wire feeding device for arc welding on a CNC lathe. The device includes a lathe body, a feeder mounted on the top of the lathe body, and a straightening mechanism located near the feeder base. The straightening mechanism includes a housing, a motor inside the housing, a drive wheel mounted on the motor's output shaft, an outer support on the housing away from the motor, a driven wheel on the outer support near the drive wheel (the driven wheel meshes with the drive wheel), an inner support inside the outer support, and a cylinder on the inner support near the driven wheel. Three guide holes are arranged in a ring array on the inner support near the driven wheel. By using the straightening mechanism, the welding wire is straightened from multiple angles through a rotating motion, gradually restoring it to a straight state during travel. Different travel distances are preset for the pressure rollers, facilitating rapid switching to accommodate welding wires of different diameters.

Description

Technical Field

[0001] This invention relates to the field of arc welding technology, and in particular to an automatic wire feeding device for arc welding on a CNC lathe. Background Technology

[0002] The automatic wire feeder for arc welding on CNC lathes is a highly efficient welding auxiliary device integrated into CNC lathes. Its core function is to automate and precisely feed the welding wire. Through coordinated operation between the CNC system and the lathe spindle and feed axes, it can precisely control the wire feed speed, start / stop timing, and wire position, ensuring a stable and continuous welding process. This device can replace manual wire feeding, effectively avoiding problems such as uneven wire feed speed and positional deviation, significantly improving welding efficiency and consistency, and reducing operator workload. Simultaneously, precise wire feed control helps optimize arc stability, reduce welding defects, and improve weld quality. It is particularly suitable for automated welding scenarios such as circumferential and longitudinal seams on rotating parts, and is a key component for expanding the welding functions of CNC lathes and achieving composite machining.

[0003] Traditional wire feeding devices are widely used in welding, but due to limitations in their structure and working principle, they often present some significant problems. During wire straightening, traditional feeders typically apply force in a single or fixed angle, primarily through several fixedly arranged straightening rollers that apply radial pressure. This results in a limited direction of straightening force, making it difficult to comprehensively cover the bending deformation that may occur in multiple dimensions of the welding wire. Especially when the welding wire exhibits spiral bends, compound bends, or complex deformations due to winding or storage, traditional feeders often cannot achieve multi-angle, all-around straightening, thus affecting the straightness and feeding stability of the welding wire. Furthermore, the fixed force direction limits the adjustment range of the straightening rollers, making it difficult to adapt to welding wires of different diameters and materials. A single-direction straightening force can easily cause scratches or uneven deformation on the welding wire surface, further affecting the stability of the welding process and the quality of the weld. Therefore, the limitations of traditional feeders in straightening not only reduce feeding accuracy and continuity but may also lead to problems such as unstable welding arcs and wire blockage, hindering the efficiency and reliability of automated welding. Summary of the Invention

[0004] In view of the problem that the feeder cannot straighten the welding wire from multiple angles in the existing technology, an automatic wire feeding device for arc welding on CNC lathe is proposed.

[0005] Its purpose is to enable the feeder to straighten the welding wire from multiple angles and adapt to welding wires of different diameters.

[0006] The technical solution of the present invention is an automatic wire feeding device for arc welding of CNC lathe, including lathe body, feeder disposed on the top of lathe body, and straightening mechanism disposed on the side near the base of feeder.

[0007] The straightening mechanism includes a housing, a motor disposed inside the housing, a drive wheel disposed on the output shaft of the motor, an outer support disposed on the side of the housing away from the motor, a driven wheel disposed on the side of the outer support near the drive wheel, the driven wheel being meshed with the drive wheel, an inner support disposed inside the outer support, a cylinder disposed on the inner support near the driven wheel, three guide holes in a ring array on the side of the inner support near the driven wheel, the guide holes penetrating both ends of the inner support, a material hole disposed at the center of the side of the outer support near the driven wheel, three drive holes in a ring array on the side of the outer support near the discharge hole, the drive holes penetrating both ends of the outer support, a pressure roller disposed inside the guide holes, the two ends of the pressure roller passing through the guide holes and the drive holes in sequence, three pressure blocks in a ring array disposed on the side of the outer support near the material hole, and a positioning unit disposed on the side of the outer support near the driven wheel;

[0008] The motor drives the driven wheel to rotate through the driving wheel, and the driven wheel drives the outer support to rotate. The pressure block is fixed to the inner support by abutting against it. When the outer support rotates, it drives the inner support to rotate through the pressure block. When the outer support and the inner support rotate relative to each other, the pressure roller moves through the drive hole.

[0009] Furthermore, the outer support has three screw holes arranged in a ring array near the material hole, and a stud is provided at the end of the pressure block away from the pressure roller. The stud is engaged with the inner wall of the screw hole.

[0010] Furthermore, the inner support has a through hole extending to the other end at one end near the driven wheel, and the outer support has a round hole at the end away from the material hole, with the inner wall of the round hole rotatably connected to the outer support.

[0011] Furthermore, the diameter of the middle part of the pressure roller is smaller than that of the two ends, and the end faces of the two ends are provided with short shafts, the outer sides of which are slidably connected to the guide hole and the drive hole in sequence.

[0012] Furthermore, the outer side of the cylinder is provided with several shallow grooves in an annular array, and the outer diameter of the cylinder matches the inner diameter of the material hole.

[0013] Furthermore, the positioning unit includes three square slots arranged in a ring array near the drive hole on the outer bracket, a guide post arranged on the side of the square slot near the corresponding drive hole, sliding grooves symmetrically arranged on both sides of the guide post, a slider sleeved on the outside of the guide post, a rotating arm sleeved on the outside of the slider, and a nut arranged on the side of the guide post away from the slider.

[0014] Furthermore, the slider has a sliding hole at one end near the nut, and the inner wall of the sliding hole is slidably connected to the guide post.

[0015] Furthermore, the outer side of the guide post is threaded, and the guide post is threadedly connected to the nut.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. By setting up a straightening mechanism, the limitation of the fixed force direction of traditional devices is changed. This mechanism adopts a circumferential rotation method to straighten the welding wire from multiple angles, so that it gradually returns to a straight state during the journey. Unlike the traditional unidirectional force application method, multi-angle straightening can act more evenly on the surface of the welding wire, reduce local stress concentration, and avoid twisting or bending. This design ensures that the welding wire maintains a stable shape before entering the next process, improving the smoothness of the wire feeding process. The straightening mechanism and the wire feeding action are coordinated and can achieve continuous operation without additional adjustments, providing a reliable wire feeding guarantee for subsequent welding processes.

[0018] 2. By setting a positioning unit, different travel distances can be preset for the pressure roller, facilitating rapid switching to accommodate welding wires of different diameters. Operators can adjust the position of the pressure roller according to the welding wire specifications, allowing the device to quickly enter working condition when changing welding wires. This design reduces adjustment time and improves work efficiency. The preset position of the pressure roller ensures uniform pressure distribution during wire feeding, avoiding unstable wire feeding or welding wire deformation caused by improper clamping. The introduction of the positioning unit enables the device to flexibly respond to the switching needs of various welding wire specifications, enhancing its versatility. In scenarios of continuous operation or frequent welding wire changes, this function demonstrates good adaptability and reduces operational difficulty.

[0019] 3. By setting up inner and outer supports, the distance between different pressure rollers can be adjusted to accommodate welding wires of different diameters. Operators can adjust the inner support accordingly based on the welding wire specifications to match the pressure roller spacing with the welding wire diameter. This design ensures that the pressure rollers uniformly press the welding wire, avoiding unstable wire feeding or welding wire deformation caused by improper spacing. The adjustment function of the inner support makes the device more adaptable and can meet the needs of using welding wires of various specifications. In scenarios where welding wires are frequently changed, the adjustment method of the inner support is simple and quick, reducing the preparation time for operation. This structural design enhances the versatility of the device. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0021] Figure 2 This is a schematic diagram showing the relative positions of the feeder and the straightening mechanism of the present invention;

[0022] Figure 3 This is an enlarged schematic diagram of the straightening mechanism of the present invention;

[0023] Figure 4 This is a schematic diagram of the internal structure of the outer shell of the present invention;

[0024] Figure 5 This is a schematic diagram of the external support structure of the present invention;

[0025] Figure 6 This is a schematic diagram of the internal support structure of the present invention;

[0026] Figure 7 This is a schematic diagram of the connection between the inner support and the pressure roller of the present invention;

[0027] Figure 8 This is a schematic diagram of the connection between the outer support and the pressure roller of the present invention;

[0028] Figure 9 This is a schematic diagram showing the connection between the pressure block and the outer support of the present invention;

[0029] Figure 10 This is a schematic diagram of the square groove structure of the present invention;

[0030] Figure 11 This is a schematic diagram of the rotating arm and slider structure of the present invention.

[0031] In the picture:

[0032] 1. Lathe body; 2. Feeder; 3. Straightening mechanism; 31. Housing; 32. Motor; 33. Drive wheel; 34. Outer support; 35. Driven wheel; 36. Inner support; 37. Cylinder; 38. Guide hole; 39. Material hole; 310. Drive hole; 311. Pressure roller; 312. Pressure block; 313. Square channel; 314. Guide post; 315. Slide groove; 316. Slider; 317. Rotary arm; 318. Nut. Detailed Implementation

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Example 1, referring to Figures 1-11This invention provides an automatic wire feeding device for arc welding on a CNC lathe, comprising a lathe body 1, a feeder 2 fixedly connected to the top of the lathe body 1, and a straightening mechanism 3 installed near the base of the feeder 2. The straightening mechanism 3 includes a housing 31, a motor 32 fixedly connected inside the housing 31, a drive wheel 33 fixedly connected to the output shaft of the motor 32, an outer support 34 rotatably connected to the side of the housing 31 away from the motor 32, a driven wheel 35 fixedly connected to the outer support 34 near the drive wheel 33, the driven wheel 35 meshing with the drive wheel 33, an inner support 36 rotatably connected to the inner side of the outer support, a cylinder 37 fixedly connected to the inner support 36 near the driven wheel 35, and three guide holes 38 arranged in a ring array on the side of the inner support 36 near the driven wheel 35. The guide holes 38 penetrate both ends of the inner support 36 and are located on the outer support. The outer support 34 has a material hole 39 at the center of one end near the driven wheel 35. Three drive holes 310 are arranged in a ring array at the end of the outer support 34 near the material hole 39. The drive holes 310 pass through both ends of the outer support 34. The pressure roller 311 is slidably connected inside the guide hole 38. The two ends of the pressure roller 311 pass through the guide hole 38 and the drive hole 310 in sequence. Three pressure blocks 312 are threadedly connected in a ring array to the end of the outer support 34 near the material hole 39. A positioning unit is also assembled on the end of the outer support 34 near the driven wheel 35. The motor 32 drives the driven wheel 35 to rotate through the drive wheel 33. The driven wheel 35 drives the outer support 34 to rotate. The pressure blocks 312 are fixed by abutting against the inner support 36. When the outer support 34 rotates, it drives the inner support 36 to rotate through the pressure blocks 312. When the outer support 34 and the inner support 36 rotate relative to each other, the pressure roller 311 moves through the drive holes 310.

[0035] Specifically, the outer casing 31 is connected to the feeder 2, thus securing itself. The motor 32 is also secured by its fixed connection to the outer casing 31. After the motor 32 starts, it drives the drive wheel 33 to rotate via its output shaft. The drive wheel 33 then drives the driven wheel 35 to rotate. Simultaneously, the driven wheel 35 rotates, causing the outer support 34 to move as well. Due to the constraint of the outer casing 31, the two ends of the outer support 34 rotate around its own axis after being driven by the driven wheel 35. As the outer support 34 rotates, the force is transmitted to the inner support 36 via the pressure block 312, causing the inner support 36 to rotate as well. During the synchronous rotation of the inner support 36 and the outer support 34, the three pressure rollers 311 rotate, passing the welding wire through the inner support 36 along its axis. Since the pressure rollers 311 have a certain deflection relative to the axis of the inner support 36, the pressure rollers 311 will pass through the middle section and contact the welding wire. The welding wire comes into contact with the pressure roller 311, which rotates rapidly around the welding wire, squeezing it from different angles to straighten it. While rotating with the inner support 36, the pressure roller 311 also rotates on its own axis. By rotating the pressure block 312, it releases itself from contact with the inner support 36. Then, the cylinder 37 rotates, causing the inner support 36 to rotate. The inner support 36 and the outer support 34 rotate relative to each other. At this time, the pressure roller 311 moves under the combined pressure of the guide hole 38 and the drive hole 310. By rotating the cylinder 37 in different directions, the pressure roller 311 can move closer to or further away from each other. After adjusting the pressure roller 311 to the desired position, the pressure block 312 is rotated, causing it to abut against the inner support 36 and thus fix it. At this time, the inner support 36 and the outer support 34 cannot rotate relative to each other, thereby fixing the distance between the different pressure rollers 311.

[0036] Reference Figures 5-9 The outer support 34 has three screw holes arranged in a ring array near the material hole 39. The end of the pressure block 312 away from the pressure roller 311 is provided with a stud, which meshes with the inner wall of the screw hole.

[0037] Specifically, as the pressure block 312 rotates, it moves along its own axis under the meshing action with the screw hole. When the pressure block 312 is tightly fitted with the inner bracket 36, it will fix the inner bracket 36.

[0038] Reference Figure 5 and Figure 6 The inner support 36 has a through hole at one end near the driven wheel 35, which extends to the other end, and the outer support 34 has a round hole at the end away from the material hole 39.

[0039] Specifically, the through holes in the inner support 36 serve as reserved space, allowing welding wires of different diameters to pass through smoothly.

[0040] Reference Figures 5-7The diameter of the middle part of the pressure roller 311 is smaller than that of the two ends, and the end faces of the two ends are provided with short shafts. The outer side of the short shafts is slidably connected to the guide hole 38 and the drive hole 310 in sequence.

[0041] Specifically, since the pressure roller 311 has a certain inclination relative to the inner support 36, it contacts the welding wire through the recessed part in the middle to accommodate the angular deviation between the two.

[0042] Reference Figure 5 and Figure 6 The outer side of the cylinder 37 has several shallow grooves arranged in a ring array, and the outer diameter of the cylinder 37 matches the inner diameter of the material hole 39.

[0043] Specifically, the outer side of the cylinder 37 is provided with several shallow grooves to increase friction and facilitate rotation of the cylinder 37. Operators can also use tools to insert into the shallow grooves to rotate the cylinder 37.

[0044] Example 2, refer to Figures 1-11 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the positioning unit includes three square slots 313 arranged in a ring array on the outer bracket 34 near the drive hole 310, a guide post 314 fixedly connected to the square slot 313 near the corresponding drive hole 310, sliding grooves 315 symmetrically opened on both sides of the guide post 314, a slider 316 sleeved on the outside of the guide post 314, a rotating arm 317 sleeved on the outside of the slider 316, and a nut 318 threadedly connected to the side of the guide post 314 away from the slider 316.

[0045] Specifically, the interior of groove 313 accommodates other components of the positioning unit. Rotating nut 318 allows it to move along guide post 314, enabling slider 316 to move along guide post 314. Simultaneously, slider 316 moves, driving rotating arm 317 to move. Rotating arm 317 can rotate around its connection point with slider 316. Slider 316 stops rotating after contacting nut 318. Therefore, nut 318 limits the maximum movement distance of slider 316. When rotating arm 317 rotates into drive hole 310, pressure roller 311 is blocked after contacting rotating arm 317 and stops moving. Therefore, moving pressure roller 311 a certain distance... After separation, rotate the rotating arm 317 into the drive hole 310, and adjust the position of the rotating arm 317 by the slider 316 so that the rotating arm 317 contacts the pressure roller 311. Then adjust the nut 318 to contact the slider 316 to record the current position of the pressure roller 311. When the pressure roller 311 needs to be adjusted to this position again, simply keep the nut 318, make the slider 316 contact the nut 318, then rotate the rotating arm 317 into the drive hole 310, and then move the pressure roller 311 to contact the rotating arm 317. At this time, the position of the pressure roller 311 is the recorded position. Only one rotating arm 317 needs to be used at the same time. Therefore, the three rotating arms 317 of the straightening mechanism 3 can record three positions.

[0046] Reference Figure 11 The slider 316 has a sliding hole at one end near the nut 318, and the inner wall of the sliding hole is slidably connected to the guide post 314.

[0047] Specifically, the slider 316 is engaged with the guide post 314 and the groove 315 through the sliding hole. Therefore, the slider 316 can only move along the guide post 314 and does not have the freedom of rotation.

[0048] Reference Figure 11 The guide post 314 has threads on its outer side, and the guide post 314 is threadedly connected to the nut 318.

[0049] Specifically, while the nut 318 rotates, it moves along the axis of the guide post 314 under the action of the thread, and the rest of the structure is the same as that of Embodiment 1.

[0050] Based on embodiments 1-2, the working principle of this invention is as follows: After the welding wire tip passes through the straightening mechanism 3, the inner support 36 is rotated to bring the three pressure rollers 311 closer together until they reach a suitable distance. Then, the rotation of the inner support 36 is stopped, and the pressure block 312 is rotated to move closer to the inner support 36, locking the inner support 36. At this time, any one of the rotating arms 317 is rotated into the corresponding drive hole 310, and the rotating arm 317 is moved by the slider 316, so that the rotating arm 317 and the pressure roller 311 are aligned. Contact the side closest to the axis of the inner support 36, move the nut 318 to contact the slider 316, and complete the recording of the current position of the pressure roller 311. Then rotate the rotating arm 317 into the corresponding square groove 313 to wait for call. When the recorded position is needed, move the pressure rollers 311 away from each other to the maximum stroke, rotate the rotating arm 317 of the recording position into the corresponding drive hole 310, and then make the pressure roller 311 in the same drive hole 310 contact the rotating arm 317. At this time, the pressure roller 311 is in the recorded position.

[0051] When the welding wire needs to be straightened, the motor 32 is started so that the driving wheel 33 drives the outer support 34 to rotate through the driven wheel 35. The outer support 34 drives the inner support 36 to rotate. The inner support 36 drives the pressure roller 311 to rotate around the welding wire. The pressure roller 311 rotates around the welding wire and squeezes the welding wire, straightening the welding wire in multiple directions. The pressure roller 311 rotates on its own axis while rotating around the welding wire to reduce damage to the surface of the welding wire and adapt to the axial displacement changes when the welding wire is pulled.

[0052] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automatic wire feeding device for arc welding on a CNC lathe, comprising a lathe body (1) and a feeder (2) disposed on the top of the lathe body (1), characterized in that: It also includes a straightening mechanism (3) located on one side of the base of the feeder (2); The straightening mechanism (3) includes a housing (31), a motor (32) disposed inside the housing (31), a drive wheel (33) disposed on the output shaft of the motor (32), an outer bracket (34) disposed on the side of the housing (31) away from the motor (32), a driven wheel (35) disposed on the side of the outer bracket (34) near the drive wheel (33), the driven wheel (35) meshing with the drive wheel (33), an inner bracket (36) disposed inside the outer bracket, a cylinder (37) disposed on the end of the inner bracket (36) near the driven wheel (35), and three guide holes (38) arranged in a ring array on the side of the inner bracket (36) near the driven wheel (35). (38) Through both ends of the inner support (36), a material hole (39) is opened at the center of the outer support (34) near the driven wheel (35), three drive holes (310) are opened in a ring array at the end of the outer support (34) near the material hole (39), the drive holes (310) pass through both ends of the outer support (34), a pressure roller (311) is set inside the guide hole (38), the two ends of the pressure roller (311) pass through the guide hole (38) and the drive hole (310) in sequence, three pressure blocks (312) are set in a ring array at the end of the outer support (34) near the material hole (39), and a positioning unit is set at the end of the outer support (34) near the driven wheel (35); The motor (32) drives the driven wheel (35) to rotate through the driving wheel (33). The driven wheel (35) drives the outer support (34) to rotate. The pressure block (312) fixes the inner support (36) by abutting against it. When the outer support (34) rotates, the inner support (36) rotates through the pressure block (312). When the outer support (34) and the inner support (36) rotate relative to each other, the pressure roller (311) moves through the drive hole (310).

2. The automatic wire feeding device for arc welding on a CNC lathe according to claim 1, characterized in that: The outer support (34) has three screw holes arranged in a ring array near the material hole (39). The end of the pressure block (312) away from the pressure roller (311) is provided with a stud, which meshes with the inner wall of the screw hole.

3. The automatic wire feeding device for arc welding on a CNC lathe according to claim 1, characterized in that: The inner support (36) has a through hole at one end near the driven wheel (35) that extends to the other end, and the outer support (34) has a round hole at one end away from the material hole (39).

4. The automatic wire feeding device for arc welding on a CNC lathe according to claim 3, characterized in that: The diameter of the middle part of the pressure roller (311) is smaller than that of the two ends, and the end faces of the two ends are provided with short shafts. The outer side of the short shafts is slidably connected to the guide hole (38) and the drive hole (310) in sequence.

5. The automatic wire feeding device for arc welding on a CNC lathe according to claim 1, characterized in that: The outer side of the cylinder (37) is provided with several shallow grooves in a ring array, and the outer diameter of the cylinder (37) matches the inner diameter of the material hole (39).

6. The automatic wire feeding device for arc welding on a CNC lathe according to claim 1, characterized in that: The positioning unit includes three square slots (313) arranged in a ring array on the outer bracket (34) near the drive hole (310), a guide post (314) on the side of the square slot (313) near the corresponding drive hole (310), sliding grooves (315) symmetrically opened on both sides of the guide post (314), a slider (316) sleeved on the outside of the guide post (314), a rotating arm (317) sleeved on the outside of the slider (316), and a nut (318) on the side of the guide post (314) away from the slider (316).

7. The automatic wire feeding device for arc welding on a CNC lathe according to claim 6, characterized in that: The slider (316) has a sliding hole at one end near the nut (318), and the inner wall of the sliding hole is slidably connected to the guide post (314).

8. The automatic wire feeding device for arc welding on a CNC lathe according to claim 6, characterized in that: The guide post (314) has threads on its outer side, and the guide post (314) is threadedly connected to the nut (318) through the threads.

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