Heat-sensitive sensor forming welding equipment and welding method

Abstract

The heat-sensitive sensor forming welding equipment comprises an upper pressing welding part and a lower clamping positioning part, and the upper pressing welding part comprises a mounting support, an upper pressing air cylinder, a lifting guide sliding table, an upper electrode base and an upper electrode; the lower clamping and positioning part comprises a positioning mounting seat, a lower electrode seat, a forming base and a movable pressing mechanism, a positioning groove and an isolation groove for placing a pin and a lead wire core are formed in the forming base, and the movable pressing mechanism is connected with a driving cylinder; the driving cylinder drives a left insulation pressing block in the movable pressing mechanism to be close to a right insulation pressing block to press the pin and the lead wire core; a cooling water circulation channel is arranged in the upper electrode seat and the positioning mounting seat and is in control connection with a cooling water circulation device; the upper electrode compresses the sensor pin and the lead wire core and then is electrified for electric resistance welding. According to the invention, resistance welding is carried out after compression molding, so that the sensor pin and the lead wire core are welded in place after compression molding, and reliable welding quality is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic automation equipment, and in particular to a thermal sensor forming welding device and a welding method. Background Art

[0002] The core production process of thermistors (also known as thermistors) is the forming and resistance welding process between the sensor pins and leads. The existing process needs to be divided into two welding processes to complete the forming and welding of thermistor leads when processed using conventional resistance welding equipment. During the two welding processes, resistance welding is first used to weld the multiple round wire cores in the wire into lead cores with a square cross-section, and then resistance welding is used to weld the square lead cores and the pins of the thermistor together.

[0003] This method of using two welding processes requires two devices and different fixtures to perform forming positioning and welding positioning respectively. After pressure forming, the sensor pins and lead wire cores will produce certain deformation when the fixture is loosened, and need to be clamped again during welding. Re-clamping and positioning can easily cause the sensor pins and lead wire cores to not be pressed into place, which can easily cause electrode adhesion during welding, resulting in poor welding quality, insufficient pulling force after welding, and a high welding defect rate. It is necessary to develop dedicated integrated forming and welding equipment. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide a thermal sensor forming welding device and a welding method, which performs welding after one-time pressing and forming, ensuring that the sensor pins and lead wire cores are welded in place after pressing and forming, thereby ensuring reliable welding quality.

[0005] To achieve the above object, the present invention adopts the following technical solutions: A thermal sensor forming welding device comprises an upper clamping welding component and a lower clamping positioning component, wherein the upper clamping welding component comprises a mounting bracket, an upper clamping cylinder, a lifting guide slide, an upper electrode seat and an upper electrode, wherein the upper clamping cylinder is arranged on the mounting bracket, and the output end of the upper clamping cylinder is connected to the lifting guide slide, the upper electrode seat is fixed on the lifting guide slide, and the upper electrode is arranged on the lower end of the upper electrode seat; the lower clamping positioning component comprises a positioning mounting seat, a lower electrode seat, a forming base and a movable clamping mechanism, the lower electrode seat is arranged on the positioning mounting seat, the forming base is arranged in the lower electrode seat, two positioning grooves and an isolation groove are arranged in the forming base, an intermediate insulating pressure plate is arranged in the isolation groove, and two pins of the sensor are placed in the In the positioning groove, the two lead wire cores to be processed are respectively overlapped on the pins of the sensor, and the movable clamping mechanism includes a left insulating clamp and a right insulating clamp, and the movable clamping mechanism is connected to a driving cylinder, and the driving cylinder drives the left insulating clamp, the forming base and the middle insulating clamp to move away from or close to the right insulating clamp to clamp the sensor pins and lead wire cores from the side during forming and welding; the upper electrode seat and the lower electrode seat are respectively connected to the positive and negative poles of the welding power supply through cables, and the upper electrode seat and the positioning mounting seat are provided with cooling water circulation channels inside, which are controlled and connected to the cooling water circulation device; after the lower end of the upper electrode clamps the sensor pins and lead wire cores, the upper electrode and the lower electrode seats are energized to perform resistance welding on the formed sensor pins and lead wire cores.

[0006] Furthermore, the movable clamping mechanism is provided with a clamping slider for fixing the left insulating pressure block, the right insulating pressure block is arranged at one end of the lower electrode seat, the clamping slider and the bottom of the forming base are slidably arranged in the guide groove of the lower electrode seat, a spring is respectively provided in the guide groove between the clamping slider and the forming base and between the forming base and the lower electrode seat, an elastic tensioning block is provided on the rear side of the clamping slider, and the driving cylinder is used to deform the elastic tensioning block to push the clamping slider and the forming base to slide in the guide groove.

[0007] Furthermore, the elastic tensioning block is arranged on the positioning mounting seat, a tensioning wedge is arranged in the elastic tensioning block, and a screw is arranged in the tensioning wedge to pass downward through the positioning mounting seat and be connected to the output end of the driving cylinder.

[0008] Furthermore, the driving cylinder is arranged on a mounting base plate at the bottom of the positioning mounting seat, and the positioning mounting seat is further fixed to the bottom of the mounting bracket.

[0009] Furthermore, the elastic tensioning block is provided with a tensioning inclined surface, an elastic vertical plate and a tensioning push block, and the tensioning wedge is provided with a wedge-shaped curved surface.

[0010] Furthermore, two electrode protrusions are provided at the lower end of the upper electrode, and the two electrode protrusions are respectively used to press a sensor pin and a lead wire core.

[0011] Furthermore, the upper pressing cylinder is connected to an electrical proportional valve for adjusting the output pressure of the upper pressing cylinder.

[0012] Furthermore, according to the above-mentioned welding method of the thermal sensor forming welding equipment, the following steps are included: S1: placing two pins of the sensor in the positioning grooves, and then lap-connecting the two lead wire cores to be processed onto the pins of the sensor respectively; S2: The driving cylinder deforms the elastic tension block through the tension wedge, thereby pushing the clamping slider and the forming base to slide in the guide groove, pushing the left insulating pressure block and the right insulating pressure block to center close to the middle insulating pressure plate and press the sensor pins and lead wire cores from the side; S3: The upper pressing cylinder pushes the upper electrode holder and the upper electrode to move downward, and the lower end of the upper electrode presses the sensor pin and the lead wire core placed in the positioning groove; S4: When the output force of the upper clamping cylinder reaches a preset value, the welding power supply outputs welding current to the upper electrode and the forming base through the upper electrode seat and the lower electrode seat respectively to perform resistance welding on the clamped sensor pins and lead wire cores; S5: After resistance welding, the cooling water circulation device is started, and the upper electrode holder, the upper electrode, the lower electrode holder and the forming base are cooled by the cooling water circulation channel. After cooling, the upper clamping cylinder drives the upper electrode to lift, and the driving cylinder drives the elastic tensioning block to retract so that the left insulating block and the right insulating block are respectively away from the middle insulating pressure plate.

[0013] Furthermore, the upper pressing cylinder, the driving cylinder, the welding power supply and the cooling water circulation device are connected to the automatic control system.

[0014] The present invention has the following beneficial effects: 1. The present invention arranges an upper clamping welding component and a lower clamping positioning component, wherein an upper clamping cylinder, a lifting guide slide and an upper electrode are arranged in the upper clamping welding component, and a lower clamping positioning component comprises a positioning mounting seat, a lower electrode seat, a molding base and a movable clamping mechanism. A molding base and a movable clamping mechanism are arranged in the lower clamping positioning component, and the movable upper electrode, the molding base and the movable clamping mechanism are used to continuously clamp the sensor pins and the lead wire cores first, and then power is turned on to continue resistance welding after the sensor pins and the lead wire cores are compressed and formed, so as to ensure reliable welding quality; the present invention is particularly suitable for semi-automatic use during manual loading and unloading operations.

[0015] 2. A left insulating pressure block and a right insulating pressure block are arranged in the movable clamping mechanism in the lower clamping and positioning component of the present invention, and an intermediate insulating pressure plate is arranged between the left insulating pressure block and the right insulating pressure block. The driving cylinder drives the left insulating pressure block, the molding base and the intermediate insulating pressure plate to approach the right insulating pressure block through the elastic tensioning block, so that the sensor pins and lead wire cores can be pressed from the side during molding and welding, avoiding displacement and deformation during the welding process, thereby ensuring reliable welding.

[0016] 3. The upper electrode of the present invention is driven by the upper clamping cylinder, and the upper clamping cylinder is connected to the electric proportional valve. The output pressure of the clamping cylinder on the electric proportional valve can be adjusted to ensure that the sensor pins and the lead wire cores can be continuously clamped and not loose. After welding, the sensor pins and the lead wire cores are more tightly fused and have greater welding strength, which can better ensure the welding quality.

[0017] 4. In the present invention, cooling water circulation channels are arranged inside the upper electrode holder and the lower electrode holder, and the cooling water circulation channels are connected to the cooling water circulation device through pipelines, so as to cool the welding electrodes in time after resistance welding, and effectively solve the problem of adhesion between the sensor pins and the lead wire cores and the electrodes during welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the thermal sensor forming welding equipment of the present invention.

[0019] Figure 2 It is a three-dimensional schematic diagram of the lower clamping and positioning component of the present invention.

[0020] Figure 3 It is a schematic cross-sectional view of the lower clamping and positioning component of the present invention.

[0021] Figure 4 It is a three-dimensional schematic diagram of the upper electrode in the present invention.

[0022] Figure 5 It is a three-dimensional schematic diagram of the lower electrode holder in the present invention.

[0023] Figure 6 It is a three-dimensional schematic diagram of the molding base in the present invention.

[0024] Figure 7 It is a three-dimensional schematic diagram of the left insulating pressing block and the pressing sliding block in the present invention.

[0025] Figure 8 It is a three-dimensional schematic diagram of the elastic tensioning block in the present invention.

[0026] Fig. 9 It is a three-dimensional schematic diagram of the tensioning wedge in the present invention.

[0027] Description of reference numerals: 1. Upper clamping welding component; 11. Mounting bracket; 12. Upper clamping cylinder; 13. Lifting guide slide; 14. Upper electrode seat; 15. Upper electrode; 151. Electrode protrusion; 2. Lower clamping positioning component; 21. Positioning mounting seat; 211. Mounting base plate; 22. Lower electrode seat; 221. Guide groove; 23. Forming base; 231. Positioning groove; 232. Isolation groove; 24. Movable clamping mechanism; 241. Left insulating pressure block; 242. Right insulating pressure block; 243. Clamping slide block; 25. Middle insulating pressure plate; 26. Driving cylinder; 27. Spring; 28. Elastic tensioning block; 281. Tensioning inclined plane; 282. Elastic vertical plate; 283. Tensioning push block; 29. ​​Tensioning wedge; 291. Wedge-shaped curved surface. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: See also Figure 1-9As shown, the thermal sensor forming welding equipment includes an upper clamping welding component 1 and a lower clamping positioning component 2, the upper clamping welding component 1 includes a mounting bracket 11, an upper clamping cylinder 12, a lifting guide slide 13, an upper electrode holder 14 and an upper electrode 15, the upper clamping cylinder 12 is arranged on the mounting bracket 11, the output end of the upper clamping cylinder 12 is connected to the lifting guide slide 13, the upper electrode holder 14 is fixed on the lifting guide slide 13, and the upper electrode 15 is further arranged at the lower end of the upper electrode holder 14; the lower end of the upper electrode 15 is provided with two electrode bumps 151, and the two electrode bumps 151 are respectively used The lower clamping and positioning component 2 comprises a positioning mounting seat 21, a lower electrode seat 22, a molding base 23 and a movable clamping mechanism 24. The lower electrode seat 22 is arranged on the positioning mounting seat 21, and the molding base 23 is arranged in the lower electrode seat 22. The molding base 23 is provided with two positioning grooves 231 and an isolation groove 232. The isolation groove 232 is provided with an intermediate insulating pressing plate 25. The two pins of the sensor are placed in the positioning groove 231. The two lead wire cores to be processed are respectively overlapped on the pins of the sensor. The movable clamping mechanism 24 comprises a left insulating pressing block 2 41 and the right insulating pressing block 242, the movable clamping mechanism 24 is connected to a driving cylinder 26, the driving cylinder 26 is arranged on the mounting base 211 at the bottom of the positioning mounting seat 21, and the positioning mounting seat 21 is fixed to the bottom of the mounting bracket 11; the driving cylinder 26 drives the left insulating pressing block 241, the molding base 23 and the middle insulating pressing plate 25 away from or close to the right insulating pressing block 242 to press the sensor pins and lead wire cores from the side during molding and welding; the movable clamping mechanism 24 is provided with a clamping slider 243 for fixing the left insulating pressing block 241, and the right insulating pressing block 242 is arranged at one end of the lower electrode seat 22, the bottom of the clamping slider 243 and the molding base 23 are slidably arranged in the guide groove 221 of the lower electrode seat 22 (the bottom of the clamping slider 243 and the molding base 23 are provided with a tenon that matches the guide groove 221), a spring 27 is respectively arranged in the guide groove 221 between the clamping slider 243 and the molding base 23 and between the molding base 23 and the lower electrode seat 22, and an elastic tensioning block 28 is arranged at the rear side of the clamping slider 243, and the driving cylinder 26 is used to deform the elastic tensioning block 28 so as to push the clamping slider 243 and the molding base 23 to slide in the guide groove 221. The elastic tensioning block 28 is arranged on the positioning mounting seat 21, and a tensioning wedge 29 is arranged in the elastic tensioning block 28, and a screw is arranged in the tensioning wedge 29 to pass downward through the positioning mounting seat 21 and connect with the output end of the driving cylinder 26.The elastic tensioning block 28 is provided with a tensioning inclined surface 281, an elastic vertical plate 282 and a tensioning push block 283, and the tensioning wedge 29 is provided with a wedge-shaped curved surface 291; when the tensioning wedge 29 moves downward, the wedge-shaped curved surface 291 squeezes the tensioning inclined surface 281 so that the tensioning push block 283 can extend to both sides, and when the tensioning push block 283 extends, it pushes the clamping slider 243 and the forming base 23 to move so that the left insulating pressure block 241 and the middle insulating pressure plate 25 are close to the right insulating pressure block 242 to clamp the sensor pins and lead wire cores from the side, and when the tensioning wedge 29 moves upward, the tensioning push block 283 retracts. The upper clamping cylinder 12, the driving cylinder 26, the welding power supply and the cooling water circulation device are connected to the automatic control system; the upper electrode seat 14 and the lower electrode seat 22 are respectively connected to the positive and negative poles of the welding power supply through cables, and the upper electrode seat 14 and the positioning mounting seat 21 are provided with cooling water circulation channels inside and connected to the cooling water circulation device control; after the lower end of the upper electrode 15 clamps the sensor pins and lead wire cores, the upper electrode 15 and the lower electrode seat 22 are energized to perform resistance welding on the formed sensor pins and lead wire cores.

[0029] According to the above-mentioned welding method of the thermal sensor forming welding equipment, the following steps are included: S1: placing two pins of the sensor in the positioning groove 231, and then lap-connecting the two lead wire cores to be processed to the pins of the sensor respectively; S2: The driving cylinder 26 deforms the elastic tensioning block 28 through the tensioning wedge 29, thereby pushing the pressing slider 243 and the forming base 23 to slide in the guide groove 221, pushing the left insulating pressing block 241 and the right insulating pressing block 242 to center and approach the middle insulating pressing plate 25 to press the sensor pins and lead wire cores from the side; S3: The upper pressing cylinder 12 pushes the upper electrode holder 14 and the upper electrode 15 to move downward, and the lower end of the upper electrode 15 presses the sensor pins and lead wire cores placed in the positioning groove 231; S4: When the output force of the upper clamping cylinder 12 reaches a preset value, the welding power supply outputs welding current to the upper electrode 15 and the forming base 23 through the upper electrode seat 14 and the lower electrode seat 22 respectively to perform resistance welding on the compressed sensor pins and lead wire cores; S5: After resistance welding, the cooling water circulation device is started, and the cooling water circulation channel is used to cool the upper electrode seat 14, the upper electrode 15, the lower electrode seat 22 and the forming base 23. After cooling, the upper clamping cylinder 12 drives the upper electrode 15 to lift, and the driving cylinder 26 drives the elastic tensioning block 28 to retract so that the left insulating block 241 and the right insulating block 242 are respectively away from the middle insulating plate 25.

[0030] The above description is only a specific implementation mode of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A thermal sensor forming welding device, comprising an upper pressing welding component (1) and a lower clamping positioning component (2), characterized in that: The upper clamping welding component (1) comprises a mounting bracket (11), an upper clamping cylinder (12), a lifting guide slide (13), an upper electrode seat (14) and an upper electrode (15); the upper clamping cylinder (12) is arranged on the mounting bracket (11); the output end of the upper clamping cylinder (12) is connected to the lifting guide slide (13); the upper electrode seat (14) is fixed on the lifting guide slide (13); and the upper electrode (15) is arranged at the lower end of the upper electrode seat (14). The lower clamping and positioning component (2) comprises a positioning mounting seat (21), a lower electrode seat (22), a molding base (23) and a movable clamping mechanism (24); the lower electrode seat (22) is arranged on the positioning mounting seat (21); the molding base (23) is arranged in the lower electrode seat (22); two positioning grooves (231) and an isolation groove (232) are arranged in the molding base (23); an intermediate insulating pressure plate (25) is arranged in the isolation groove (232); two pins of the sensor are arranged In the positioning groove (231), two lead wire cores to be processed are respectively overlapped on the pins of the sensor, and the movable clamping mechanism (24) includes a left insulating clamping block (241) and a right insulating clamping block (242). The movable clamping mechanism (24) is connected to a driving cylinder (26), and the driving cylinder (26) drives the left insulating clamping block (241), the molding base (23) and the middle insulating clamping plate (25) to move away from or close to the right insulating clamping block (242) for molding and During welding, the sensor pin and the lead wire core are compressed from the side; the upper electrode seat (14) and the lower electrode seat (22) are respectively connected to the positive and negative electrodes of the welding power source via cables; the upper electrode seat (14) and the positioning mounting seat (21) are provided with cooling water circulation channels inside and are connected to the control of the cooling water circulation device; after the lower end of the upper electrode (15) compresses the sensor pin and the lead wire core, the upper electrode (15) and the lower electrode seat (22) are energized to perform resistance welding on the formed sensor pin and the lead wire core.

2. The thermal sensor forming and welding equipment according to claim 1, characterized in that: The movable clamping mechanism (24) is provided with a clamping slider (243) for fixing the left insulating clamping block (241); the right insulating clamping block (242) is provided at one end of the lower electrode seat (22); the clamping slider (243) and the bottom of the molding base (23) are slidably provided in the guide groove (221) of the lower electrode seat (22); a spring (27) is provided in each of the guide grooves (221) between the clamping slider (243) and the molding base (23) and between the molding base (23) and the lower electrode seat (22); an elastic tensioning block (28) is provided on the rear side of the clamping slider (243); and the driving cylinder (26) is used to deform the elastic tensioning block (28) so as to push the clamping slider (243) and the molding base (23) to slide in the guide groove (221).

3. The thermal sensor forming and welding equipment according to claim 2, characterized in that: The elastic tensioning block (28) is arranged on the positioning mounting seat (21), a tensioning wedge (29) is arranged in the elastic tensioning block (28), and a screw is arranged in the tensioning wedge (29) that passes downward through the positioning mounting seat (21) and is connected to the output end of the driving cylinder (26).

4. The thermal sensor forming and welding equipment according to claim 3, characterized in that: The driving cylinder (26) is arranged on a mounting base plate (211) at the bottom of the positioning mounting seat (21), and the positioning mounting seat (21) is fixed to the bottom of the mounting bracket (11).

5. The thermal sensor forming and welding equipment according to claim 3, characterized in that: The elastic tensioning block (28) is provided with a tensioning inclined surface (281), an elastic vertical plate (282) and a tensioning push block (283), and the tensioning wedge (29) is provided with a wedge-shaped curved surface (291).

6. The thermal sensor forming and welding equipment according to claim 1, characterized in that: Two electrode protrusions (151) are provided at the lower end of the upper electrode (15), and the two electrode protrusions (151) are respectively used to press a sensor pin and a lead wire core.

7. The thermal sensor forming and welding equipment according to claim 1, characterized in that: The upper pressing cylinder (12) is connected to an electric proportional valve for adjusting the output pressure of the upper pressing cylinder (12).

8. The processing method of the thermal sensor forming welding equipment according to claim 3 is characterized in that: The steps include: S1: placing two pins of the sensor in the positioning groove (231), and then lap-connecting two lead wire cores to be processed onto the pins of the sensor respectively; S2: The driving cylinder (26) deforms the elastic tensioning block (28) through the tensioning wedge (29), thereby pushing the clamping slider (243) and the forming base (23) to slide in the guide groove (221), pushing the left insulating pressure block (241) and the right insulating pressure block (242) to align close to the middle insulating pressure plate (25) to press the sensor pins and lead wire core from the side; S3: the upper pressing cylinder (12) pushes the upper electrode seat (14) and the upper electrode (15) to move downward, and the lower end of the upper electrode (15) presses the sensor pin and the lead wire core placed in the positioning groove (231); S4: When the output force of the upper pressing cylinder (12) reaches a preset value, the welding power supply outputs welding current to the upper electrode (15) and the forming base (23) through the upper electrode seat (14) and the lower electrode seat (22) respectively to perform resistance welding on the pressed sensor pins and lead wire cores; S5: After resistance welding, the cooling water circulation device is started, and the upper electrode holder (14), the upper electrode (15), the lower electrode holder (22) and the forming base (23) are cooled by using the cooling water circulation channel. After cooling, the upper clamping cylinder (12) drives the upper electrode (15) to lift up, and the driving cylinder (26) drives the elastic tensioning block (28) to retract so that the left insulating clamping block (241) and the right insulating clamping block (242) are respectively away from the middle insulating clamping plate (25).

9. The processing method of the thermal sensor forming welding equipment according to claim 8, characterized in that: The upper pressing cylinder (12), the driving cylinder (26), the welding power source and the cooling water circulation device are connected to the automatic control system.

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