SMA metal wire resistance welding device

Abstract

The invention relates to the technical field of SMA metal wire welding, in particular to an SMA metal wire resistance welding device which comprises an electrode holder, an electrode tip and a metal isolation belt. The electrode tip can move towards the direction of the positioning part; and the body of the metal isolation strip passes through the space between the electrode holder and the electrode tip. The metal isolation strip is arranged between the electrode holder and the electrode tip, in the welding process, the electrode tip is close to the electrode holder and applies pressure to the SMA metal wire across the metal isolation strip, an insulating layer on the surface of the SMA metal wire can be effectively punctured, it can be ensured that current flows through the SMA metal wire through the metal isolation strip, and reliable welding is achieved. And meanwhile, the metal isolation belt can prevent molten enameled residues from being attached to the electrode tip, so that stable operation and welding quality of equipment are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of SMA wire welding technology, and more particularly to an SMA wire resistance welding apparatus. Background Technology

[0002] Resistance welding is a welding technique that uses the resistance heat generated by the current flowing through the workpiece and its contact interface to achieve localized heating, and then applies pressure to complete the connection. When applied to SMA wire, because its surface is covered with an insulating layer, the molten enamel residue from the welding process can easily adhere to the electrodes that puncture the insulating layer. Over time, this can affect the normal operation of the equipment and the welding quality. Summary of the Invention

[0003] The present invention aims to solve the problem that the adhesion of enameled residue to the electrode affects the normal operation of the equipment and the welding quality.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an SMA metal wire resistance welding device, comprising: An electrode holder, wherein the top surface of the electrode holder is provided with a positioning part; An electrode head, which is movable toward the positioning part; A metal isolation strip passes between the electrode holder and the electrode head.

[0005] The beneficial effects of this invention are as follows: By setting a metal insulating strip between the electrode holder and the electrode head, during the welding process, the electrode head approaches the electrode holder and applies pressure to the SMA wire through the metal insulating strip. This not only effectively pierces the insulation layer on the surface of the SMA wire but also ensures that the current flows through the SMA wire via the metal insulating strip, achieving reliable welding. Simultaneously, the metal insulating strip prevents molten enameled residue from adhering to the electrode head, thereby ensuring stable equipment operation and welding quality. Attached Figure Description

[0006] Figure 1 This is a schematic diagram of the structure of an SMA metal wire resistance welding device proposed in this invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of an SMA metal wire resistance welding device proposed in this invention. Figure 2 ; Figure 3 This is a schematic diagram of the cross-sectional structure of the metal isolation strip passing through the electrode head in an SMA metal wire resistance welding device proposed in this invention. Figure 4 This is a schematic diagram of the wire feeding and cutting section of an SMA metal wire resistance welding device proposed in this invention. Figure 5This is a schematic diagram of the regulator structure of an SMA metal wire resistance welding device proposed in this invention; Figure 6 This is a schematic diagram of the feeding device structure of an SMA metal wire resistance welding apparatus proposed in this invention. Figure 7 This is a schematic diagram of the output SMA metal wire routing of the feeding device of the SMA metal wire resistance welding apparatus proposed in this invention. Figure 8 This is a schematic diagram of the rotating shaft structure of an SMA metal wire resistance welding device proposed in this invention; Figure 9 A schematic diagram of the rocker structure of an SMA metal wire resistance welding device proposed in this invention; Figure 10 for Figure 6 Enlarged view of part A of an SMA metal wire resistance welding device; Label Explanation: 1. Electrode holder; 2. Electrode head; 21. Electrode post; 22. Guide block; 221. Guide groove; 3. Metal isolation belt; 4. Belt pulley; 5. Belt pulley; 51. First drive motor; 6. Feeding nozzle; 7. Cutting knife; 8. Regulator; 81. First linear reciprocating device; 82. Second linear reciprocating device; 83. Rotator; 9. Feeding device; 91. Frame; 92. Wire spool; 93. Rocker arm; 931. Roller; 932. Assembly hole; 94. Tension sensor; 95. Second drive motor; 96. Output plate; 961. Wire hole; 97. Rotating shaft; 971. Flat end; 10. SMA metal wire. Detailed Implementation

[0007] To explain in detail the technical content, objectives, and effects of the present invention, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0008] Resistance welding is a welding technique that uses the resistance heat generated by the current flowing through the workpiece and its contact interface to achieve localized heating, and then applies pressure to complete the connection. When applied to SMA metal wire, because its surface is covered with an insulating layer, molten enameled residue can easily adhere to the electrode that punctures the insulating layer during welding. Over time, this can affect the normal operation of the equipment and the welding quality. In this embodiment, a metal isolation strip 3 is set between the electrode holder 1 and the electrode head 2. During the welding process, the metal isolation strip 3 can prevent molten enameled residue from adhering to the electrode head 2, ensuring that the electrode head 2 is clean. At the same time, the SMA metal wire 10 is pre-stretched by the feeding device 9 to ensure welding accuracy.

[0009] Please refer to Figures 1 to 3 As shown, the present invention provides an SMA metal wire resistance welding device, including an electrode holder 1, an electrode head 2, and a metal isolation strip 3. The top surface of the electrode holder 1 is provided with a positioning part; the electrode head 2 is movable toward the positioning part; and the metal isolation strip 3 passes through the space between the electrode holder 1 and the electrode head 2.

[0010] Working principle: A metal insulating strip 3 is set between the electrode holder 1 and the electrode head 2. During the welding process, the electrode head 2 approaches the electrode holder 1 and applies pressure to the SMA wire 10 through the metal insulating strip 3. This not only effectively pierces the insulation layer on the surface of the SMA wire 10, but also ensures that the current flows through the SMA wire 10 through the metal insulating strip 3, achieving reliable welding. At the same time, the metal insulating strip 3 can prevent molten enameled residue from adhering to the electrode head 2, thereby ensuring stable equipment operation and welding quality.

[0011] It is worth noting that the selected metal insulating strip 3 needs to have a melting point higher than the welding temperature of the SMA metal wire 10 to avoid melting the metal insulating strip 3. The positioning part can be a positioning groove or positioning post opened on the top surface of the electrode seat 1 for positioning and placing the material to be welded to the SMA metal wire 10, or it can be a combination of positioning groove and positioning post.

[0012] In some implementations, please refer to Figure 3 As shown, the electrode head 2 includes an electrode post 21 and a guide block 22. The electrode post 21 passes through the guide block 22, and the guide block 22 is provided with a guide groove 221 adapted to the metal isolation strip 3. The metal isolation strip 3 passes between the electrode post 21 and the electrode seat 1. The guide groove 221 can constrain the metal isolation strip 3 to ensure that the metal isolation strip 3 can separate the electrode post 21 from the SMA metal wire 10 during welding.

[0013] In some implementations, please refer to Figure 1 and Figure 2 As shown, the aforementioned SMA metal wire resistance welding apparatus further includes a feed pulley 4 and a winding pulley 5, with both ends of the metal isolation belt 3 wound onto the feed pulley 4 and the winding pulley 5, respectively. By winding the metal isolation belt 3 onto the winding pulley 5, the metal isolation belt 3 on the feed pulley 4 is released, ensuring that the body of the metal isolation belt 3 located below the electrode head 2 can conduct electricity.

[0014] It is worth noting that after one to five welding passes, the winding roller 5 is required to wind up the metal isolation strip 3, which is covered with enameled residue. Each winding is 5mm to 10mm to ensure that the metal isolation strip 3 below the electrode head 2 is clean each time.

[0015] In some implementations, please refer to Figure 2 As shown, the reel 5 is equipped with a first drive motor 51. The first drive motor 51 drives the reel 5 to perform the winding operation of the metal isolation strip 3. At the same time, it prevents the reel 5 from reversing, ensuring that the metal isolation strip 3 below the electrode head 2 is clean during each welding operation.

[0016] In some implementations, please refer to Figure 4 As shown, the above-mentioned SMA metal wire resistance welding device further includes a wire feed nozzle 6 and a cutter 7. The discharge end of the wire feed nozzle 6 faces the electrode base 1, and the cutter 7 is located between the wire feed nozzle 6 and the electrode head 2. The cutter 7 is movable toward the positioning part. The SMA metal wire 10 is fed to the electrode base 1 by the wire feed nozzle 6, and the SMA metal wire 10 is cut by the cutter 7 after welding is completed.

[0017] In some implementations, please refer to Figure 5 As shown, the aforementioned SMA metal wire resistance welding apparatus further includes an adjuster 8, which comprises a first linear reciprocating device 81 and a second linear reciprocating device 82. The first linear reciprocating device 81 is used to drive the electrode holder 1 to move closer to and further away from the electrode head 2 in a horizontal direction, and the second linear reciprocating device 82 is used to drive the electrode holder 1 to adjust its position below the electrode head 2 in a horizontal direction. The first linear reciprocating device 81 avoids the need for operators to handle materials below the electrode head 2; the second linear reciprocating device 82 enables continuous welding of multiple SMA metal wires 10 onto the material.

[0018] In some implementations, please refer to Figure 5 As shown, the regulator 8 also includes a rotator 83, which is used to adjust the angle of the electrode holder 1 below the electrode head 2. The rotator 83 enables welding of the SMA wire 10 in multiple directions on the material.

[0019] In some implementations, please refer to Figure 6 and Figure 7 As shown, the aforementioned SMA metal wire resistance welding apparatus further includes a feeding device 9, which comprises a frame 91, a spool 92, and a rocker arm 93. The spool 92 is rotatably mounted on the frame 91, and the rocker arm 93 is oscillatingly mounted on the frame 91. A roller 931 is rotatably mounted on the rocker arm 93. The SMA metal wire 10 output from the spool 92 passes over the roller 931 and is fed into the wire feed nozzle 6. Since the SMA metal wire 10 shrinks when heated, the pulling force is adjusted by oscillating the rocker arm 93 to pre-stretch the SMA metal wire 10. This elongation is used to compensate for the thermal shrinkage variables during the welding process, thereby ensuring welding accuracy.

[0020] For details, please refer to Figure 8 and Figure 9As shown, a rotating shaft 97 is rotatably mounted on the frame 91. The end of the rotating shaft 97 is provided with a flat head 971. The rocker arm 93 is provided with a mounting hole 932 that is adapted to the flat head 971. The rocker arm 93 is assembled with the flat head 971 at the end of the rotating shaft 97 through its mounting hole 932, so that the rotational motion of the rotating shaft 97 can be synchronously transmitted to the rocker arm 93, driving it to rotate accordingly.

[0021] Preferably, the mounting hole 932 is an elongated hole along the length of the rocker arm 93, and the end of the flat head 971 is provided with a threaded hole. The elongated design of the mounting hole 932 allows for adjustment of the mounting position of the flat head 971 and flexible setting of the pre-pull-out force. After the bolt passes through the rocker arm 93, it connects to the threaded hole, and its nut abuts against the rocker arm 93. This not only prevents the flat head 971 from sliding within the mounting hole 932 during operation but also enables rapid assembly of the rocker arm 93 and the rotating shaft 97.

[0022] In some implementations, please refer to Figure 6 and Figure 7 As shown, the feeding device 9 also includes a tension sensor 94. The SMA metal wire 10 output by the roller 931 passes over the detection roller of the tension sensor 94 and is fed into the wire feeding nozzle 6. The tension sensor 94 monitors the drawing force in real time, and the pre-stretch length of the SMA metal wire 10 can be predicted based on the measurement data.

[0023] In some implementations, please refer to Figure 6 and Figure 10 As shown, the frame 91 is provided with an output plate 96, and the output plate 96 is provided with a wire threading hole 961. The SMA metal wire 10 output by the tension sensor 94 can be guided into the wire inlet of the wire feed nozzle 6 through the wire threading hole 961 on the output plate 96.

[0024] In some implementations, please refer to Figure 6 As shown, the feeding device 9 also includes a second drive motor 95, the output shaft of which is connected to the bobbin 92. The second drive motor 95 controls the output of the SMA metal wire 10 from the bobbin 92, thus avoiding affecting the stretching of the SMA metal wire 10.

[0025] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent modifications made based on the content of the present invention specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. An SMA metal wire resistance welding device, characterized in that, include: An electrode holder, wherein the top surface of the electrode holder is provided with a positioning part; An electrode head, which is movable toward the positioning part; A metal isolation strip passes between the electrode holder and the electrode head.

2. The SMA metal wire resistance welding apparatus according to claim 1, characterized in that: The electrode head includes an electrode post and a guide block. The electrode post passes through the guide block, and the guide block is provided with a guide groove adapted to the metal isolation strip. The metal isolation strip passes between the electrode post and the electrode seat.

3. The SMA metal wire resistance welding apparatus according to claim 1, characterized in that: It also includes a tape unwinding pulley and a tape winding pulley, with the two ends of the metal isolation belt wound around the tape unwinding pulley and the tape winding pulley, respectively.

4. The SMA metal wire resistance welding apparatus according to claim 3, characterized in that: The pulley is equipped with a first drive motor.

5. The SMA metal wire resistance welding apparatus according to claim 1, characterized in that: It also includes a wire feeding nozzle and a cutting blade. The discharge end of the wire feeding nozzle faces the electrode seat, and the cutting blade is located between the wire feeding nozzle and the electrode head. The cutting blade can move toward the positioning part.

6. The SMA metal wire resistance welding apparatus according to claim 1, characterized in that: It also includes an adjuster, which includes a first linear reciprocating device and a second linear reciprocating device. The first linear reciprocating device is used to drive the electrode holder to move closer to and further away from the electrode head in a horizontal direction, and the second linear reciprocating device is used to drive the electrode holder to adjust the position of the electrode holder below the electrode head in a horizontal direction.

7. The SMA metal wire resistance welding apparatus according to claim 6, characterized in that: The regulator also includes a rotator for adjusting the angle of the electrode holder below the electrode head.

8. The SMA metal wire resistance welding apparatus according to claim 5, characterized in that: It also includes a feeding device, which includes a frame, a spool, and a rocker arm; the spool is rotatably mounted on the frame, the rocker arm is oscillatingly mounted on the frame, and a roller is rotatably mounted on the rocker arm; the SMA metal wire output by the spool passes around the roller and is fed into the wire feeding nozzle.

9. The SMA metal wire resistance welding apparatus according to claim 8, characterized in that: The feeding device also includes a tension sensor, and the SMA metal wire output by the roller is fed into the wire feeding nozzle after passing around the detection roller of the tension sensor.

10. The SMA metal wire resistance welding apparatus according to claim 8, characterized in that: The feeding device also includes a second drive motor, the output shaft of which is connected to the bobbin drive.

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