A resistance strip laser welding device

Abstract

The utility model provides a kind of resistance material belt laser welding device, it includes feeding assembly, welding assembly and winding frame sequentially arranged along material belt feeding direction.Welding assembly includes jig, vacuum box, distance adjusting support and two laser welding machines on distance adjusting support;Jig includes base, sealing cover, upper support, limit sliding block and two auxiliary clamping blocks, base is equipped with feeding end, discharge end and welding area, auxiliary clamping block is equipped with gas groove;Sealing cover is equipped with optical glass, optical glass is attached with anti -reflective film;First retaining roller and reference shaft are equipped in welding area, upper support is located in sealing cover, upper support is equipped with second retaining roller, limit sliding block is equipped with limit shaft.First retaining roller, second retaining roller, limit shaft and reference shaft cooperate to provide limit to material belt, avoid to occur to deviate or to miss weld, and vacuum box and auxiliary clamping block are vacuumized in welding position, remove the impurity generated in welding process, avoid the formation of blowhole or inclusion in weld position, improve welding quality.

Description

Technical Field

[0001] This utility model relates to the field of alloy resistor production, and in particular to a laser welding device for resistor strips. Background Technology

[0002] Figure 1 The diagram shows a cross-sectional view of the alloy resistor 20, which consists of a resistor body 21 and electrodes 22 welded to both sides of the resistor body 21. Before manufacturing the alloy resistor 20, two electrode strips are welded to both sides of the resistor strip to prepare the alloy resistor strip. In the subsequent processing station, the strip is cut radially, and the cut individual units are then shaped, repaired, coated with a protective layer, and other processes to activate the alloy resistor 20.

[0003] In the raw material preparation process, two strips of material, which serve as electrodes, need to be welded to both sides of the resistive material strip. All three strips are thin, long, and soft. During welding, the strips are prone to misalignment. Since the welding target is the strip, the welding machine needs to perform welding operations continuously for a long time. Impurities or gases generated in the welding work area are easily drawn into the molten pool, forming pores or inclusions, which affect the welding quality. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a resistance strip laser welding device that limits the strip to prevent displacement or incomplete welding, and vacuums the welding position to remove impurities generated during the welding process, thereby preventing the formation of pores or inclusions at the weld and improving welding quality.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A resistance strip laser welding device includes: a feeding assembly, a welding assembly, and a winding frame arranged sequentially along the strip feeding direction;

[0007] The welding assembly includes a fixture, a vacuum chamber, an adjustable support, and two laser welding machines mounted on the adjustable support. The strip to be welded is threaded through the fixture.

[0008] The fixture includes a base, a sealing cover, an upper support, a limiting slider, and two auxiliary clamps. The sealing cover covers the base to form a box-shaped structure with a sealed top. The vacuum chamber is connected to the inner cavity of the base. The base is provided with a feeding end, a discharging end, and a welding area. The two auxiliary clamps are respectively located on the feeding end and the discharging end. The auxiliary clamps are provided with air grooves, which are connected to an external air pump. The air grooves cooperate with the vacuum chamber to keep the inner cavity of the base under negative pressure.

[0009] An optical glass is provided on the sealing cover facing the welding area, and an anti-reflective film is attached to the surface of the optical glass;

[0010] The welding area is provided with a first retaining roller and a reference shaft. The upper support is located inside the sealing cover. The upper support is provided with a second retaining roller. The first retaining roller and the second retaining roller cooperate to clamp the front and back sides of the material strip. The limiting slider is slidably provided in the welding area. The limiting slider is provided with a limiting shaft. The limiting shaft cooperates with the reference shaft to drive multiple material strips to move closer to each other.

[0011] In one embodiment, the auxiliary clamp is provided with a bolt and a wing nut, and the sealing cover is provided with a U-shaped groove that matches the bolt. The U-shaped groove is used to accommodate the bolt, and rotating the wing nut is used to lock the sealing cover.

[0012] In one embodiment, the auxiliary clamp is provided with a quick-change connector, which is in communication with the air groove.

[0013] In one embodiment, both the feed end and the discharge end are provided with a hanging plate, the hanging plate is provided with a first elastic pad, and the sealing cover is provided with a second elastic pad that matches the first elastic pad. The first elastic pad and the second elastic pad cooperate to clamp the material strip.

[0014] In one embodiment, the hanging plate is provided with an elastic hook for holding the first elastic pad.

[0015] In one embodiment, a knob is provided in the welding area, and the knob is threadedly connected to the limiting slider. Rotating the knob is used to drive the limiting slider closer to or away from the reference axis.

[0016] In one embodiment, a protective baffle is provided within the welding area.

[0017] In one embodiment, the sealing cover is provided with an L-shaped slot, and the optical glass is slidably disposed in the L-shaped slot.

[0018] In one embodiment, a shaping frame is provided between the welding assembly and the winding frame, and a shaping roller is provided inside the shaping frame. The shaping roller is used to roll the strip that has been welded.

[0019] In one embodiment, a cleaning table is provided between the feeding assembly and the welding assembly, and a felt is provided on the cleaning table, the felt being in contact with the surface of the strip to be welded.

[0020] The first holding roller, the second holding roller, the limiting shaft, and the reference shaft work together to limit the material strip, preventing deviation or incomplete welding. The vacuum box and auxiliary clamping blocks evacuate the welding position to remove impurities generated during the welding process, preventing the formation of pores or inclusions at the weld position and improving welding quality. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the cross-section of an alloy resistor;

[0023] Figure 2 This is a schematic diagram of the structure of a resistance strip laser welding device;

[0024] Figure 3 This is a schematic diagram of the welding assembly;

[0025] Figure 4 This is a schematic diagram of the cross-section of the fixture;

[0026] Figure 5 This is a diagram showing the disassembly of the fixture;

[0027] Figure 6 This is a schematic diagram showing the clamping of the material strip by the cooperation of the limiting shaft and the reference shaft;

[0028] Figure 7 This is a schematic diagram illustrating the disassembly of the auxiliary clamping block.

[0029] Reference numerals: 10, Laser welding device for resistance strip; 100, Feeding assembly; 200, Welding assembly; 210, Vacuum chamber; 220, Adjustable spacing bracket; 230, Laser welding machine; 300, Rewinding frame; 400, Fixture; 410, Base; 41, Feeding end; 42, Discharge end; 43, Welding zone; 411, First holding roller; 412, Reference shaft; 413, Hanging plate; 4131, Elastic hook; 414, First elastic pad; 4 15. Knob; 416. Protective baffle; 420. Sealing cover; 421. Optical glass; 422. Second elastic pad; 423. L-shaped slot; 424. U-shaped slot; 430. Upper bracket; 431. Second retaining roller; 440. Limiting slider; 441. Limiting shaft; 450. Auxiliary clamp; 451. Air groove; 452. Bolt; 453. Wing nut; 454. Quick-change connector; 500. Shaping frame; 600. Cleaning table. Detailed Implementation

[0030] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0033] Please see Figure 2 This utility model provides a resistance strip laser welding device 10, which includes: a feeding component 100, a welding component 200 and a winding frame 300 arranged sequentially along the strip feeding direction.

[0034] Please see Figure 3 The welding assembly 200 includes a fixture 400, a vacuum chamber 210, an adjustable support 220, and two laser welding machines 230 mounted on the adjustable support 220. The strip to be welded is threaded through the fixture 400.

[0035] Please see Figure 4 and Figure 5 The fixture 400 includes a base 410, a sealing cover 420, an upper support 430, a limiting slider 440, and two auxiliary clamping blocks 450. The sealing cover 420 covers the base 410 to form a box-shaped structure with a sealed top. The vacuum box 210 is connected to the inner cavity of the base 410. The base 410 is provided with a feeding end 41, a discharging end 42, and a welding area 43. The two auxiliary clamping blocks 450 are respectively provided on the feeding end 41 and the discharging end 42. An air groove 451 is provided on the auxiliary clamping block 450. The air groove 451 is connected to an external air pump. The air groove 451 cooperates with the vacuum box 210 to make the inner cavity of the base 410 a negative pressure state.

[0036] Please see Figure 4 and Figure 5 An optical glass 421 is provided on the sealing cover 420 facing the welding area 43. An anti-reflection film is attached to the surface of the optical glass 421. The anti-reflection film on the surface of the optical glass 421 can reduce reflected light, allowing more laser energy to penetrate the optical glass 421 and enter the welding area 43, thereby improving welding accuracy and efficiency.

[0037] Please see Figure 4 and Figure 6 The welding area 43 is provided with a first retaining roller 411 and a reference shaft 412. The upper support 430 is located inside the sealing cover 420. The upper support 430 is provided with a second retaining roller 431. The first retaining roller 411 and the second retaining roller 431 cooperate to clamp the front and back sides of the material strip. The limiting slider 440 is slidably provided in the welding area 43. The limiting slider 440 is provided with a limiting shaft 441. The limiting shaft 441 cooperates with the reference shaft 412 to drive multiple material strips to move closer to each other.

[0038] The process by which the aforementioned resistance strip laser welding device 10 welds the resistance strip to two electrode strips together is as follows:

[0039] The ends of the three strips are fixed to the take-up frame 300, and the resistive strip is positioned between the two electrode strips. Each strip passes through the feeding assembly 100 and the welding assembly 200. When the take-up frame 300 rotates, it provides traction force to drive the strips to feed. The feeding assembly 100 is equipped with rollers to roll the strips and shape them before welding. The welding assembly 200 welds the strips together by laser welding.

[0040] When the strip passes through the fixture 400, the first holding roller 411 and the second holding roller 431 cooperate to clamp the front and back sides of the strip, flattening the portion of the strip located in the welding area 43 and preventing the strip from warping. The limiting shaft 441 and the reference shaft 412 cooperate to squeeze the strip from the side, bringing the strips closer together and ensuring contact between adjacent strips to avoid incomplete welding. The first holding roller 411, the second holding roller 431, the limiting shaft 441, and the reference shaft 412 provide all-round limiting for the parts of the strip to be welded, ensuring accurate welding position.

[0041] Meanwhile, when the laser welding machine 230 welds the strip in the welding area 43, the vacuum box 210 extracts the gas from the inner cavity of the base 410 and draws the impurities generated during the welding process into the vacuum box 210 to prevent impurities from being drawn into the molten pool and causing inclusions or bubbles to form at the weld. Because the welding strip continuously moves from the feed end 41 to the discharge end 42 during the welding process, the feed end 41 and the discharge end 42 are not completely sealed. External gas and foreign objects can enter the welding zone 43 from here, making the welding zone 43 approximately a vacuum. To prevent the feed strip from bringing external impurities into the welding zone 43 and to maintain the air pressure at the welding zone 43, this application provides two auxiliary clamps 450. The air grooves 451 inside these clamps are connected to an external air pump, which can extract gas at both the feed end 41 and the discharge end 42, sucking away the air that enters the fixture 400 from the feed end 41 and the discharge end 42. That is, the feed end 41, the discharge end 42, and the welding zone 43 are all equipped with independent air extraction structures. The three work together to maintain the air pressure in the welding zone 43, ensuring that impurities and gas generated during the welding process are not drawn into the molten pool, thus guaranteeing the quality of the weld.

[0042] Please see Figure 5 and Figure 7 In one embodiment, the auxiliary clamping block 450 is provided with a bolt 452 and a wing nut 453, and the sealing cover 420 is provided with a U-shaped groove 424 that matches the bolt 452. The U-shaped groove 424 is used to accommodate the bolt 452, and rotating the wing nut 453 is used to lock the sealing cover 420. The bolt 452 and the auxiliary clamping block 450 body are rotatably connected. After loosening the wing nut 453, the bolt 452 can be moved to separate it from the U-shaped groove 424, thereby releasing the lock on the sealing cover 420. After moving the bolt 452 to contact the U-shaped groove 424, tightening the wing nut 453 will lock the wing nut 453 on the base 410, which is convenient for maintenance personnel to remove the fixture 400 to replace the material strip before production begins.

[0043] Please see Figure 5 In one embodiment, the auxiliary clamping block 450 is provided with a quick-change connector 454, which is connected to the air groove 451.

[0044] Please see Figure 4 and Figure 7In one embodiment, both the feed end 41 and the discharge end 42 are provided with a hanging plate 413. A first elastic pad 414 is provided on the hanging plate 413, and a second elastic pad 422 matching the first elastic pad 414 is provided on the sealing cover 420. The first elastic pad 414 and the second elastic pad 422 cooperate to clamp the material strip. Both the first elastic pad 414 and the second elastic pad 422 are elastic. When they clamp the material strip, only the parts in contact with the material strip deform, while the rest remain in a close fit, thereby reducing the gap between the feed end 41 and the discharge end 42, and thus improving the sealing performance of the fixture 400. Preferably, the hanging plate 413 is provided with an elastic hook 4131, which is used to clamp the first elastic pad 414. The first elastic pad 414 contacts the material strip, and the material strip rubs against the first elastic pad 414 when feeding, causing wear. Providing the elastic hook 4131 allows for quick replacement of the first elastic pad 414, reducing the maintenance difficulty of the equipment.

[0045] Please see Figure 6 In one embodiment, a knob 415 is provided in the welding area 43. The knob 415 is threadedly connected to the limiting slider 440. Rotating the knob 415 is used to drive the limiting slider 440 closer to or further away from the reference axis 412. The position of the limiting slider 440 can be adjusted by the knob 415 to increase or decrease the distance between the limiting axis 441 and the reference axis 412 to adapt to strips of different widths.

[0046] Please see Figure 4 In one embodiment, a protective baffle 416 is provided in the welding area 43 to provide a barrier and prevent laser scattering from damaging the first holding roller 411 and the second holding roller 431 during welding.

[0047] Please see Figure 5 In one embodiment, the sealing cover 420 is provided with an L-shaped slot 423, and the optical glass 421 is slidably disposed in the L-shaped slot 423 to facilitate replacement of the optical glass 421.

[0048] Please see Figure 2 In one embodiment, a shaping frame 500 is provided between the welding assembly 200 and the winding frame 300, and a shaping roller is provided inside the shaping frame 500. The shaping roller is used to roll the strip that has been welded.

[0049] Please see Figure 2 In one embodiment, a cleaning table 600 is provided between the feeding assembly 100 and the welding assembly 200. The cleaning table 600 is provided with a felt, which contacts the surface of the strip to be welded. When the strip is fed, it rubs against the felt, and the impurities on the surface of the strip are removed by wiping with the felt.

[0050] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A laser welding apparatus for resistance strips, characterized in that, include: The feeding assembly, welding assembly, and winding frame are arranged sequentially along the feeding direction of the material strip; The welding assembly includes a fixture, a vacuum chamber, an adjustable support, and two laser welding machines mounted on the adjustable support. The strip to be welded is threaded through the fixture. The fixture includes a base, a sealing cover, an upper support, a limiting slider, and two auxiliary clamps. The sealing cover covers the base to form a box-shaped structure with a sealed top. The vacuum chamber is connected to the inner cavity of the base. The base is provided with a feeding end, a discharging end, and a welding area. The two auxiliary clamps are respectively located on the feeding end and the discharging end. The auxiliary clamps are provided with air grooves, which are connected to an external air pump. The air grooves cooperate with the vacuum chamber to keep the inner cavity of the base under negative pressure. An optical glass is provided on the sealing cover facing the welding area, and an anti-reflective film is attached to the surface of the optical glass; The welding area is provided with a first retaining roller and a reference shaft. The upper support is located inside the sealing cover. The upper support is provided with a second retaining roller. The first retaining roller and the second retaining roller cooperate to clamp the front and back sides of the material strip. The limiting slider is slidably provided in the welding area. The limiting slider is provided with a limiting shaft. The limiting shaft cooperates with the reference shaft to drive multiple material strips to move closer to each other.

2. The resistance strip laser welding apparatus according to claim 1, characterized in that, The auxiliary clamp is provided with a bolt and a wing nut, and the sealing cover is provided with a U-shaped groove that matches the bolt. The U-shaped groove is used to accommodate the bolt, and rotating the wing nut is used to lock the sealing cover.

3. The resistance strip laser welding apparatus according to claim 1, characterized in that, The auxiliary clamp is equipped with a quick-change connector, which is connected to the air groove.

4. The resistance strip laser welding apparatus according to claim 1, characterized in that, Both the feed end and the discharge end are provided with a hanging plate, the hanging plate is provided with a first elastic pad, and the sealing cover is provided with a second elastic pad that matches the first elastic pad. The first elastic pad and the second elastic pad cooperate to clamp the material strip.

5. The resistance strip laser welding apparatus according to claim 4, characterized in that, The hanging plate is provided with an elastic hook, which is used to clamp the first elastic pad.

6. The resistance strip laser welding apparatus according to claim 1, characterized in that, A knob is provided in the welding area. The knob is threadedly connected to the limiting slider. Rotating the knob is used to drive the limiting slider closer to or away from the reference axis.

7. The resistance strip laser welding apparatus according to claim 1, characterized in that, The welding area is equipped with protective barriers.

8. The resistance strip laser welding apparatus according to claim 1, characterized in that, The sealing cover is provided with an L-shaped slot, and the optical glass is slidably disposed in the L-shaped slot.

9. The resistance strip laser welding apparatus according to claim 1, characterized in that, A shaping frame is provided between the welding assembly and the winding frame, and a shaping roller is provided inside the shaping frame. The shaping roller is used to roll the strip that has been welded.

10. The resistance strip laser welding apparatus according to claim 1, characterized in that, A cleaning table is provided between the feeding assembly and the welding assembly. A felt is provided on the cleaning table, and the felt is in contact with the surface of the strip to be welded.

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