A laser welding machine for alloy resistance

Abstract

This invention provides a laser welding machine for alloy resistors, comprising a guiding mechanism, a leveling mechanism, a cleaning mechanism, a welding mechanism, a receiving mechanism, and a winding reel arranged sequentially along the feeding direction of the alloy resistor strip. The welding mechanism includes a double-head welding platform and a fixture. The fixture has two clearance openings. The double-head welding platform has two laser welding heads and a translational slide matching each laser welding head. Each laser welding head faces one clearance opening. The translational slide drives the two laser welding heads to move horizontally, causing them to stagger. The two laser welding heads are staggered and weld simultaneously, allowing welding of two different parts in a single feed. This reduces the welding process of the alloy resistor strip by half, improving welding efficiency. Simultaneously, the transmission distance of the alloy resistor strip is also reduced by half, eliminating the need for a separate welding device for secondary welding, thus saving both equipment manufacturing costs and space.

Description

Technical Field

[0001] The invention relates to the field of alloy resistor processing, in particular to a laser welding machine for alloy resistors. Background Art

[0002] Figure 1 The present invention discloses an alloy resistor strip material 20, which is a semi-finished alloy resistor, and includes a resistor body 21 and two conductors 22. The two conductors 22 are distributed on both sides of the resistor body 21. The conductors 22 and the resistor body 21 are connected by welding, and a first weld 23 and a second weld 24 are formed at the boundary between the resistor body 21 and the conductor 22. In other words, the alloy resistor strip material 20 is essentially formed by welding three metal alloy resistor strips, and the alloy resistor strip material 20 needs to be subjected to resistance adjustment, pelletizing and other processes in subsequent processes to obtain the finished alloy resistor.

[0003] During the process of making the alloy resistor strip material 20, the above three alloy resistor strip materials need to be welded together. When the existing equipment welds the alloy resistor strip material 20, the resistor 21 raw material and one of the conductor 22 raw materials are pulled by a traction mechanism, and a track is set on the feeding tracks of the two. The two are guided to approach each other through the track, and then they are welded by a laser welding machine. The conductor 22 is welded on one side of the resistor 21. The alloy resistor strip material that has been welded once enters the next welding equipment under the action of the traction mechanism, and another conductor 22 raw material is configured at the equipment, and the conductor 22 is welded on the other side of the resistor 21 in the same way.

[0004] It can be seen that in the existing process, the process of welding the conductor 22 on both sides of the resistor 21 requires two weldings, and two welding devices need to be configured on the forward track of the alloy resistor strip material. The processing process is long, the efficiency is low, and the equipment occupies a large area. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a laser welding machine for alloy resistors, thereby improving the welding efficiency of alloy resistor strips, reducing the size of the equipment, and improving the space utilization rate in the workshop.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A laser welding machine for alloy resistors, comprising a material guiding mechanism, a leveling mechanism, a cleaning mechanism, a welding mechanism, a material receiving mechanism and a winding disk arranged in sequence along the feeding direction of the alloy resistor strip material;

[0008] The welding mechanism includes a double-head welding platform and a jig, the jig is provided with two avoidance openings, the double-head welding platform is provided with two laser welding heads and a translation slide matching the laser welding heads, each of the laser welding heads faces one of the avoidance openings, and the translation slide is used to drive the two laser welding heads to translate and stagger the two laser welding heads.

[0009] In one embodiment, the fixture includes an upper cover, a base, an upper pressure rod, a lower pressure rod, a reference guide column and a distance adjustment block. The upper cover is rotatably arranged on the base, the upper pressure rod is arranged in the upper cover, and the lower pressure rod is located in the base. The upper pressure rod and the lower pressure rod are used to press the upper and lower end faces of the alloy resistance strip material; the reference guide column is arranged in the base, and the distance adjustment block is slidably arranged in the base. A limit column is provided on the distance adjustment block, and the limit column and the reference guide column are used to make multiple alloy resistance strips close to each other.

[0010] In one embodiment, the fixture further includes a blocking sheet, and the blocking sheet is used to protect the upper pressure rod, the lower pressure rod, the reference guide column and the distance adjustment block.

[0011] In one of the embodiments, a rotating sleeve is provided at a position on the reference guide column and the limit column that contacts the alloy resistance strip material.

[0012] In one embodiment, the leveling mechanism includes a base, a movable bracket and a lifting cylinder connected to the movable bracket, a plurality of lower leveling rollers are provided in the base, a plurality of upper leveling rollers are provided on the movable bracket, and the lower leveling rollers are staggered with the upper leveling rollers, the upper leveling rollers and the lower leveling rollers cooperate to roll the alloy resistance strip material, and the lifting cylinder is used to drive the upper leveling rollers to approach or move away from the lower leveling rollers.

[0013] In one embodiment, the cleaning mechanism includes a felt, a pressure plate, a supporting platform and a downward pressure cylinder. The pressure plate is arranged at the output end of the downward pressure cylinder. The pressure plate pushes the felt to press the alloy resistor strip material on the supporting platform. The felt is used to wipe off foreign matter on the surface of the alloy resistor strip material.

[0014] In one embodiment, the cleaning mechanism is provided with an unwinding wheel, a winding wheel, a first tensioning wheel, a second tensioning wheel and a third tensioning wheel; the unwinding wheel, the pressure plate and the downward pressure cylinder are located above the supporting platform, and the winding wheel is located below the supporting platform; the felt is wound on the unwinding wheel, and the end of the felt is connected to the winding wheel; the first tensioning wheel is located above the downward pressure cylinder, the second tensioning wheel is located above the unwinding wheel, and the third tensioning wheel is located below the unwinding wheel; the unwound portion of the felt passes through the pressure plate and the first tensioning wheel, the second tensioning wheel and the third tensioning wheel and is then laid flat on the supporting platform, so that the unwound portion of the felt is distributed in a spiral shape.

[0015] In one embodiment, the cleaning mechanism is provided with an upper traction wheel group and a lower traction wheel group, and each of the upper traction wheel group and the lower traction wheel group is provided with a felt, the felt in the upper traction wheel group passes through the pressure plate, and the moving direction of the felt on the pressure plate is consistent with the feeding direction of the alloy resistor strip material; the felt in the lower traction wheel group passes through the supporting platform, and the moving direction of the felt on the supporting platform is consistent with the feeding direction of the alloy resistor strip material; when the pressure plate is close to the supporting platform, the two felts jointly clamp the alloy resistor strip material.

[0016] In one embodiment, the upper traction wheel group includes a first traction wheel and a second traction wheel, the felt is wound on the first traction wheel, and the end of the felt is connected to the second traction wheel.

[0017] In one embodiment, the pressure plate includes a main body, a limiting roller and a locking block, the limiting roller and the locking block are respectively located on both sides of the main body, and the cleaning mechanism is provided with a locking cylinder matching the locking block, and the output end of the locking cylinder extends out to push the locking block tightly against the outer wall of the main body and thereby clamp the felt.

[0018] The above laser welding machine for alloy resistance has the following advantages:

[0019] The two laser welding heads are staggered and perform welding at the same time. A single feed can be used to weld two different parts, reducing the welding process of the alloy resistor strip by half. While improving the welding efficiency, the transmission distance of the alloy resistor strip is also reduced by half. There is no need to set up another welding equipment for secondary welding, which saves equipment manufacturing costs and space. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the alloy resistance strip material;

[0022] Figure 2 It is a schematic diagram of the structure of a laser welding machine for alloy resistance;

[0023] Figure 3 is a front view of a laser welding machine for alloy resistance;

[0024] Figure 4 The figure is a schematic diagram of the disassembly of the leveling mechanism;

[0025] Figure 5 It is a structural schematic diagram of the welding mechanism;

[0026] Figure 6 It is a structural diagram of the fixture;

[0027] Figure 7 It is a schematic diagram of the cooperation between the strip material and the reference guide column and the limit column;

[0028] Figure 8 It is a schematic diagram of the cooperation between the strip material and the upper pressure rod and the lower pressure rod;

[0029] Fig. 9 It is a structural schematic diagram of the cleaning mechanism in Example 1;

[0030] Fig.10 It is a structural schematic diagram of the cleaning mechanism in Example 2;

[0031] Fig.11 for Fig.10 A schematic diagram of the cooperation between the felt and the alloy resistance strip material in the cleaning mechanism shown;

[0032] Fig.12 It is a structural schematic diagram of the cleaning mechanism in Example 3;

[0033] Fig.13 for Fig.12 A schematic diagram of the cooperation between the felt and the alloy resistance strip material in the cleaning mechanism shown;

[0034] Fig.14 It is a structural schematic diagram of the pressure plate. DETAILED DESCRIPTION

[0035] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly understood.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] See also Figure 2 and Figure 3 The present invention provides a laser welding machine 10 for alloy resistors, which includes a material guiding mechanism 100, a leveling mechanism 200, a cleaning mechanism 300, a welding mechanism 400, a material receiving mechanism 500 and a winding disk 600 arranged in sequence along the feeding direction of the alloy resistor strip material 20.

[0039] See also Figure 3 and Figure 5 The welding mechanism 400 includes a double-head welding platform 410 and a jig 420. The jig 420 is provided with two avoidance openings 11. The double-head welding platform 410 is provided with two laser welding heads 411 and a translation slide 412 matching the laser welding heads 411. Each laser welding head 411 faces a avoidance opening 11. The translation slide 412 is used to drive the two laser welding heads 411 to translate and stagger the two laser welding heads 411.

[0040] During the welding operation, the raw materials of the resistor 21 and the two conductors 22 are fed from the material guiding mechanism 100, the leveling mechanism 200 rolls the resistor 21 and the conductor 22 to make them flat, the cleaning mechanism 300 wipes the oil and dust on the surface of the resistor 21 and the conductor 22, and then the welding mechanism 400 performs welding at the first weld 23 and the second weld 24, and the three are welded together to form an alloy resistor strip 20. During the above feeding process, the receiving mechanism 500 provides traction, and the welded alloy resistor strip 20 is finally wound on the winding reel 600.

[0041] During the above welding operation, the resistor 21 and the two conductors 22 are fed simultaneously, and the jig 420 provides a limit so that the two conductors 22 are tightly attached to the resistor 21. One of the laser welding heads 411 performs welding along the first weld 23, and the other laser welding head 411 performs welding along the second weld 24.

[0042] It should be noted that the two laser welding heads 411 on the double-head welding platform 410 are arranged at intervals along the feeding direction of the strip, and each laser welding head 411 is equipped with a translation slide 412. The position of the laser welding head 411 is adjusted by the translation slide 412, so that the laser welding head 411 can be adjusted according to the actual position of the first weld 23 and the second weld 24, and welding is performed at the positions of the two welds at the same time after the resistor 21 and the conductor 22 enter the fixture 420; on the other hand, when the width of the resistor 21 or the conductor 22 changes, the position of the laser welding head 411 can be adjusted by the translation slide 412 to realign it with the weld, so that the double-head welding platform 410 can perform welding operations on alloy resistor strips 20 of different specifications, thereby improving the universality of the equipment.

[0043] The above-mentioned laser welding machine 10 for alloy resistors has the following advantages:

[0044] The two laser welding heads 411 are staggered and perform welding at the same time. A single feed can be used to weld two different parts, reducing the welding process of the alloy resistor strip by half. While improving the welding efficiency, the transmission distance of the alloy resistor strip is also reduced by half. There is no need to set up another welding equipment for secondary welding, which saves equipment manufacturing costs and space.

[0045] During the welding process of the laser welding head 411, it is necessary to ensure that the two conductors 22 are closely attached to the two sides of the resistor 21. The raw materials of the resistor 21 and the conductor 22 are both strip-shaped coils. The three are independent of each other. The vibration generated during the operation of the equipment can easily cause the resistor 21 and the conductor 22 to be staggered, thereby causing the problem of welding leakage. On the other hand, when the raw materials of the resistor 21 and the two conductors 22 are strip-shaped coils, the equipment only ensures that the three are fed synchronously, but cannot ensure that the three are exhausted at the same time. When one of the raw materials is exhausted, it is necessary to stop the machine to replace the coil, and after taking out the excess strip in the equipment, the resistor 21 and the two conductors 22 are pulled to the receiving mechanism 500 again, and the receiving mechanism 500 provides traction to drive the strip to continue to move forward. However, this operation process requires cutting the alloy resistor strip 20, taking out the unused strip in the equipment, and replacing it with a new strip, which not only wastes materials, but also the resulting alloy resistor strip 20 is discontinuous, resulting in an unstable length of the alloy resistor strip 20, which is not conducive to subsequent processing.

[0046] See also Figure 6 , Figure 7 and Figure 8 To solve the above problems, the fixture 420 includes an upper cover 421, a base 422, an upper pressure rod 423, a lower pressure rod 424, a reference guide column 425 and a distance adjustment block 426. The upper cover 421 is rotatably arranged on the base 422, the upper pressure rod 423 is arranged in the upper cover 421, and the lower pressure rod 424 is located in the base 422. The upper pressure rod 423 and the lower pressure rod 424 cooperate to press the upper and lower end surfaces of the alloy resistor strip material; the reference guide column 425 is arranged in the base 422, and the distance adjustment block 426 is slidably arranged in the base 422. A limit column 427 is provided on the distance adjustment block 426, and the limit column 427 cooperates with the reference guide column 425 to make a plurality of alloy resistor strips close to each other.

[0047] The fixture 420 further includes a blocking sheet 428 , which is used to protect the upper pressing rod 423 , the lower pressing rod 424 , the reference guide column 425 and the distance adjustment block 426 .

[0048] The reference guide column 425 and the position of the limit column 427 in contact with the alloy resistance strip material are both provided with a rotating sleeve 429 .

[0049] In this way, after the resistor 21 and the conductor 22 enter the fixture 420, the upper pressure rod 423 and the lower pressure rod 424 cooperate to press down the upper and lower end surfaces thereof to prevent the resistor 21 and the conductor 22 from being offset from each other; at the same time, the limit column 427 guides the conductor 22 and the resistor 21 toward the side where the reference guide column 425 is located, thereby providing lateral limitation, so that the resistor 21 and the conductor 22 remain in close contact, thereby ensuring the success rate of welding the alloy resistor strip 20.

[0050] Furthermore, the upper cover 421 and the base 422 are rotatably connected. When the raw materials of the resistor 21 or the conductor 22 are used up, the upper cover 421 can be opened, and the new strip of material can be placed between the limit column 427 and the reference guide column 425. The distance adjustment block 426 is adjusted to make the resistor 21 and the conductor 22 stick together again, and then the upper cover 421 is closed to complete the material replacement operation. When the machine is restarted, the laser welding head 411 continues the welding operation, and the newly placed strip of material can be welded together with other strips. The alloy resistor strip 20 provides traction to make the new strip of material enter the material receiving mechanism 500, thereby completing the strip clamping operation.

[0051] It should be noted that the strip replacement process does not require cutting the alloy resistor strip 20, and the reel 600 can continue to reel the alloy resistor strip 20 until the target length is reached, ensuring that the length of each bundle of alloy resistor strip 20 reeled by the reel 600 is consistent, which is conducive to reducing the waste of raw materials. Among them, the connection position of the new and old strips will become defective products in the subsequent pellet cutting process and be sorted out, and there is no need to set up a new station for special processing, which is conducive to improving the processing efficiency of the alloy resistor and shortening the production process of the alloy resistor.

[0052] See also Figure 4 In one embodiment, the leveling mechanism 200 includes a base 210, a movable bracket 220 and a lifting cylinder 230 connected to the movable bracket 220. A plurality of lower leveling rollers 211 are provided in the base 210, and a plurality of upper leveling rollers 221 are provided on the movable bracket 220. The lower leveling rollers 211 are staggered with the upper leveling rollers 221. The upper leveling rollers 221 and the lower leveling rollers 211 cooperate to roll the resistor 21 and the conductor 22, and perform shaping before the welding operation so that the resistor 21 and the conductor 22 become straight.

[0053] The cleaning mechanism 300 and the receiving mechanism 500 are distributed on both sides of the welding mechanism 400. The cleaning mechanism 300 generates resistance on the raw materials of the resistor 21 and the conductor 22 while cleaning them. The resistance cooperates with the traction force applied by the receiving mechanism 500 to keep the resistor 21 and the conductor 22 taut during the feeding process. The specific structure of the cleaning mechanism 300 is as follows: Embodiment 1:

[0054] See also Fig. 9 The cleaning mechanism 300 includes a felt 310, a pressing plate 320, a supporting platform 330 and a pressing cylinder 340. The pressing plate 320 is arranged at the output end of the pressing cylinder 340. The pressing plate 320 pushes the felt 310 to press the alloy resistor strip material 20 on the supporting platform 330. The felt 310 is used to wipe off foreign matter on the surface of the alloy resistor strip material.

[0055] The output end of the pressing cylinder 340 remains in an extended state. In this state, the pressing plate 320 presses the felt 310 toward the supporting platform 330. The resistor 21 and the conductor 22 are in contact with the felt 310 through the cleaning mechanism 300, and the felt 310 wipes off foreign matter such as oil, dust and the like attached to their surfaces. At the same time, the friction force generated between the felt 310 and the resistor 21 and the conductor 22 keeps them in a tensioned state during the feeding process.

[0056] The felt 310 is a consumable material, and foreign matter on the surface of the resistor 21 and the conductor 22 will be retained on the felt 310. In order to ensure the cleanliness of the felt 310, it is necessary to drag the felt 310 regularly to move the contaminated parts away. Embodiment 2:

[0057] See also Fig.10 and Fig.11 , which is different from Example 1 in that the cleaning mechanism 300 is further provided with an unwinding wheel 350, a rewinding wheel 360, a first tensioning wheel 371, a second tensioning wheel 372 and a third tensioning wheel 373, the unwinding wheel 350, the pressing plate 320 and the pressing cylinder 340 are located above the carrier platform 330, the rewinding wheel 360 is located below the carrier platform 330, the felt 310 is rewound on the unwinding wheel 350, the end of the felt 310 is connected to the rewinding wheel 360, the first tensioning wheel 371 is located above the pressing cylinder 340, the second tensioning wheel 372 is located above the unwinding wheel 350, and the third tensioning wheel 373 is located below the unwinding wheel 350;

[0058] The unwound portion of the felt 310 passes through the pressing plate 320 and the first tensioning wheel 371 , the second tensioning wheel 372 and the third tensioning wheel 373 and is then laid flat on the supporting platform 330 , so that the unwound portion of the felt 310 is distributed in a spiral shape, so that when the felt 310 extends from the pressing plate 320 .

[0059] In Example 1, two bundles of felt 310 need to be set on the cleaning mechanism 300, one bundle is responsible for wiping the front side of the raw materials of the resistor 21 and the conductor 22, and the other bundle is responsible for wiping the back side of the raw materials of the resistor 21 and the conductor 22, and the surface of the felt 310 that contacts the raw materials of the resistor 21 and the conductor 22 is the front side of the felt 310. After the front side of the felt 310 is contaminated, it is necessary to drag the felt 310 to move the remaining stained part away so that the clean part on it can contact the raw materials of the resistor 21 and the conductor 22. The operation process always uses the front side of the felt 310 for wiping, while the back side of the felt 310 is not used, resulting in a waste of materials.

[0060] In this embodiment, when the felt 310 passes through the pressure plate 320, its front side faces the support platform 330. In the process of the felt 310 bypassing the first tensioning wheel 371, the second tensioning wheel 372 and the third tensioning wheel 373 and extending to the support platform 330, the felt 310 circles around the unwinding wheel 350 as the center. Since the first tensioning wheel 371, the second tensioning wheel 372 and the third tensioning wheel 373 provide limit stops, the felt 310 is distributed in a vortex shape at this time. The moving direction of the felt 310 is as follows: Fig.11 As shown by the middle arrow, the portion laid on the supporting platform 330 is the back side of the felt 310. The back side of the felt 310 is used to wipe the back side of the raw materials of the resistor 21 and the conductor 22. Only a bundle of felt 310 is provided on the cleaning mechanism 300 to obtain the cleaning effect in Example 1, which is beneficial to improve the utilization rate of the felt 310, avoid material waste, and reduce the production cost of the alloy resistor. Embodiment 3:

[0061] See also Fig.12 and Fig.13 The difference between this embodiment and the first embodiment is that the cleaning mechanism 300 is provided with an upper traction wheel group 380 and a lower traction wheel group 390, and each of the upper traction wheel group 380 and the lower traction wheel group 390 is provided with a felt 310, and the felt 310 in the upper traction wheel group 380 passes through the pressing plate 320, and the moving direction of the felt 310 located on the pressing plate 320 is consistent with the feeding direction of the alloy resistance strip material 20;

[0062] The felt 310 in the lower traction wheel group 390 passes through the carrier 330, and the moving direction of the felt 310 on the carrier 330 is consistent with the feeding direction of the alloy resistance strip material 20; the moving direction of the felt 310 is as follows: Fig.13 Indicated by the arrow.

[0063] When the pressing plate 320 is close to the carrying platform 330 , the two felts 310 clamp the alloy resistor strip material together.

[0064] The upper traction wheel group 380 includes a first traction wheel 381 and a second traction wheel 382. The felt 310 is wound on the first traction wheel 381. The end of the felt 310 is connected to the second traction wheel 382. The first traction wheel 381 and the second traction wheel 382 are both equipped with independent motors, and the motors are used to control the timing and angle of rotation of the first traction wheel 381 and the second traction wheel 382. The structure of the lower traction wheel group 390 is the same as that of the upper traction wheel group 380.

[0065] See also Fig. 9 , Fig.11 and Fig.13It can be seen that in Example 1 and Example 2, the moving direction of the felt 310 is perpendicular to the moving direction of the resistor 21 and the conductor 22. Therefore, before driving the felt 310 to move, the resistor 21 and the conductor 22 are stopped from feeding, and the output end of the downward pressure cylinder 340 is retracted, so that the felt 310 no longer squeezes the resistor 21 and the conductor 22. Otherwise, when the felt 310 moves, it will cause the resistor 21 and the conductor 22 to shift laterally, so that the resistor 21 and the conductor 22 are separated from each other, and even cause the resistor 21 or the conductor 22 to bend. Each time the felt 310 is moved, it needs to be stopped, which will affect the welding efficiency of the alloy resistor strip 20; on the other hand, although the downward pressure cylinder 340 is retracted before the felt 310 is moved to remove the pressure on the felt 310, the surface of the felt 310 is rough, and friction will be generated during its movement, and there is a probability that the resistor 21 and the conductor 22 will shift laterally.

[0066] Compared with Embodiment 1 and Embodiment 2, the differences in adjusting the felt 310 in Embodiment 3 are as follows:

[0067] The first traction wheel 381 rotates to unwind the felt 310, and the unwinding speed is lower than the feeding speed of the alloy resistance strip material 20, and the output end of the pressing cylinder 340 is kept in an extended state, providing pressure to make the felt 310 close to the resistor 21 and the conductor 22;

[0068] Since the felt 310 remains in close contact with the strip and the feeding speed of the strip is greater than the unwinding speed of the felt 310, the friction force generated between the felt 310 and the strip will drive the felt 310 to move forward along the feeding direction of the alloy resistor strip 20, and then the contaminated part of the felt 310 moves out of the clamping range of the pressure plate 320 and the pressure plate 320; and in this process, the contaminated felt 310 is rolled up by the second traction wheel 382.

[0069] It should be emphasized that in Example 3, the displacement direction of the felt 310 is changed. By setting the upper traction wheel group 380 and the lower traction wheel group 390, the displacement direction of the felt 310 is consistent with the feeding direction of the alloy resistor 20. Therefore, the friction force generated on the felt 310 when the resistor 21 and the conductor 22 are fed can be used to assist in moving the felt 310. On the one hand, there is no need to stop the machine during the adjustment of the felt 310, thereby avoiding interference with the welding efficiency of the alloy resistor strip 20. Since the displacement direction of the felt 310 is consistent with the feeding direction of the alloy resistor strip 20, the friction force generated during the movement of the felt 310 will not cause lateral displacement of the resistor 21 and the conductor 22, which is beneficial to improving the welding accuracy of the alloy resistor strip 20 and reducing the probability of defective products during the welding process.

[0070] See also Fig.14Preferably, the pressure plate 320 includes a main body 321, a limiting roller 322 and a locking block 323, the limiting roller 322 and the locking block 323 are respectively located on both sides of the main body 321, and a locking cylinder 324 matching the locking block 323 is provided on the cleaning mechanism 300, and the output end of the locking cylinder 324 is extended to push the locking block 323 to fit tightly against the outer wall of the main body 321 and thus clamp the felt 310; the locking cylinder 324 is retracted only when the felt 310 needs to be moved, and the thrust on the locking block 323 is removed, so that the locking block 323 cannot squeeze the felt 310; and when the locking cylinder 324 is extended again, the locking block 324 clamps the felt 310 on the main body 321, so that it will not move during the cleaning process.

[0071] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A laser welding machine for alloy resistance, characterized in that: It includes a material guiding mechanism, a leveling mechanism, a cleaning mechanism, a welding mechanism, a material receiving mechanism and a winding reel which are sequentially arranged along the feeding direction of the alloy resistance strip material; The welding mechanism comprises a double-head welding platform and a jig, the jig is provided with two avoidance openings, the double-head welding platform is provided with two laser welding heads and a translation slide matched with the laser welding heads, each of the laser welding heads faces one of the avoidance openings, and the translation slide is used to drive the two laser welding heads to translate and stagger the two laser welding heads; The jig comprises an upper cover, a base, an upper pressure rod, a lower pressure rod, a reference guide column and a distance-adjusting block. The upper cover is rotatably arranged on the base, the upper pressure rod is arranged in the upper cover, and the lower pressure rod is located in the base. The upper pressure rod and the lower pressure rod cooperate to press the upper and lower end faces of the alloy resistance strip material; the reference guide column is arranged in the base, and the distance-adjusting block is slidably arranged in the base. A limiting column is provided on the distance-adjusting block, and the limiting column cooperates with the reference guide column to bring a plurality of alloy resistance strip materials closer to each other; the jig also comprises a blocking sheet, and the blocking sheet is used to protect the upper pressure rod, the lower pressure rod, the reference guide column and the distance-adjusting block; the positions of the reference guide column and the limiting column that are in contact with the alloy resistance strip material are provided with rotating sleeves.

2. The laser welding machine for alloy resistance according to claim 1, characterized in that: The leveling mechanism includes a base, a movable bracket and a lifting cylinder connected to the movable bracket, a plurality of lower leveling rollers are provided in the base, a plurality of upper leveling rollers are provided on the movable bracket, and the lower leveling rollers are staggered with the upper leveling rollers, the upper leveling rollers and the lower leveling rollers cooperate to roll the alloy resistance strip material, and the lifting cylinder is used to drive the upper leveling rollers to approach or move away from the lower leveling rollers.

3. The laser welding machine for alloy resistance according to claim 1, characterized in that: The cleaning mechanism includes a felt, a pressure plate, a supporting platform and a downward pressure cylinder. The pressure plate is arranged at the output end of the downward pressure cylinder. The pressure plate pushes the felt to press the alloy resistor strip material on the supporting platform. The felt is used to wipe off foreign matter on the surface of the alloy resistor strip material.

4. The laser welding machine for alloy resistor according to claim 3, characterized in that: The cleaning mechanism is provided with an unwinding wheel, a rewinding wheel, a first tensioning wheel, a second tensioning wheel and a third tensioning wheel, the unwinding wheel, the pressure plate and the downward pressure cylinder are located above the bearing platform, the rewinding wheel is located below the bearing platform, the felt is rolled up on the unwinding wheel, the end of the felt is connected to the rewinding wheel, the first tensioning wheel is located above the downward pressure cylinder, the second tensioning wheel is located above the unwinding wheel, and the third tensioning wheel is located below the unwinding wheel; The unwound portion of the felt passes through the pressure plate and the first tensioning wheel, the second tensioning wheel and the third tensioning wheel and is then laid flat on the supporting platform, so that the unwound portion of the felt is distributed in a spiral shape.

5. The laser welding machine for alloy resistance according to claim 3, characterized in that: The cleaning mechanism is provided with an upper traction wheel group and a lower traction wheel group, each of which is provided with a felt, the felt in the upper traction wheel group passes through the pressing plate, and the moving direction of the felt on the pressing plate is consistent with the feeding direction of the alloy resistance strip material; The felt in the lower traction wheel group passes through the bearing platform, and the moving direction of the felt on the bearing platform is consistent with the feeding direction of the alloy resistance strip material; When the pressing plate is close to the supporting platform, the two felts clamp the alloy resistance strip material together.

6. The laser welding machine for alloy resistors according to claim 5, characterized in that: The upper traction wheel group includes a first traction wheel and a second traction wheel, the felt is wound on the first traction wheel, and the end of the felt is connected to the second traction wheel.

7. The laser welding machine for alloy resistors according to claim 3, characterized in that: The pressure plate includes a main body, a limiting roller and a locking block, the limiting roller and the locking block are respectively located on both sides of the main body, the cleaning mechanism is provided with a locking cylinder matching the locking block, the output end of the locking cylinder extends out to push the locking block tightly against the outer wall of the main body and thus clamp the felt.

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