Welding device for relay production

Abstract

The invention relates to a relay production welding device which comprises a rotary welding table driven by a motor to rotate, and an inner cavity of the rotary welding table is provided with three machining stations which are evenly arranged and used for placing relays. The feeding mechanism is arranged on the side edge of the rotary welding table and used for feeding, and the welding mechanism is used for welding the relays in the machining stations; the invention relates to the technical field of relay production. According to the welding device for relay production, through the integrated design that three stations of the rotary welding table cooperate, a micro-positive pressure inert environment is formed through press fit of a sealing cover and a piston drives protective gas to be circularly filtered, core breakthroughs of near-zero loss of welding protective gas and reduction of the oxidation rate of a welding spot to 0.08% are achieved; on one hand, by means of gas storage tank volume optimization and an interference sealing structure, it is ensured that argon-nitrogen mixed gas is stably isolated from oxygen in dynamic welding; on the other hand, splashing impurities are automatically removed through the filter screen translation slag scraping mechanism, and secondary pollution is thoroughly eliminated.

Description

Technical Field

[0001] The present invention relates to the technical field of relay production, in particular to a relay production welding device. Background Art

[0002] Relay welding is a core process to ensure the electrical conductivity and mechanical strength of contacts. Traditional welding devices have the following technical defects: Serious waste of shielding gas Open workstations require continuous gas supply (argon flow rate ≥ 10L / min), and the actual utilization rate is less than 30%, which is very costly.

[0003] Direct gas emissions lead to a decrease in oxygen content in the workshop, posing a safety hazard.

[0004] Insufficient sealing reliability Static sealing rings are prone to aging at high temperatures (rubber hardness decreases by 40% at temperatures above 150°C), and air infiltration causes oxidation of solder joints (contact resistance increases by 20% to 50%).

[0005] Welding slag splashes and contaminates the contacts, and the removal rate of traditional dust collection devices is less than 70%.

[0006] Low production efficiency The single-station welding cycle is >45 seconds, which cannot match the automated production line rhythm (<25 seconds / piece).

[0007] The existing unresolved issues of gas recycling and dynamic filtration of welding slag result in an overall defect rate of >5%. Summary of the Invention

[0008] In view of the deficiencies in the prior art, the present invention provides a relay production welding device that solves the above-mentioned problems.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: a relay production welding device, comprising a rotary welding table driven by a motor, the inner cavity of the rotary welding table having three evenly spaced processing stations for placing relays, a loading mechanism disposed on the side of the rotary welding table for loading materials, and a welding mechanism for welding the relays in the processing stations; The processing station includes an air storage tank and a processing tank distributed sequentially from bottom to top in the inner cavity of the rotary welding table. The top of the air storage tank is connected to the inner cavity of the processing tank through a connecting groove. The inner cavity of the air storage tank is slidably sealed with a piston plate driven by a cylinder. The side of the processing tank is connected to an air nozzle connected to a shielding gas source. The processing station also includes a filter mechanism arranged in the inner cavity of the rotary welding table for filtering the shielding gas. The welding mechanism includes a frame arranged on the side of the rotary welding table, the top of the frame is slidably connected to an upper cover plate driven by a driving mechanism, the inner cavity of the upper cover plate is equipped with a welding head, and the bottom of the frame is sealed with the processing station through a sealing mechanism. When in use, shielding gas is injected downward through the air nozzle in advance. Because the shielding gas is heavier than air, it sinks into the processing tank and the gas storage tank. Then, the relay is placed in the processing tank in the processing station through the loading mechanism, and then rotated 120 degrees to place the reed through the unloading mechanism, and then rotated 120 degrees to the bottom of the welding mechanism. At this time, the frame drives the upper cover plate to descend, driving the welding head and the sealing strip to descend. The sealing strip is embedded in the sealing groove to isolate the processing groove from the outside world. At this time, the welding head descends to weld, and is protected by the shielding gas to prevent contact with oxygen in the air. After the processing is completed, there may be sputtered solid impurities in the air. At this time, the piston plate descends to form a negative pressure in the gas storage tank, and the shielding gas is drawn into the gas storage tank, and then filtered through the filter to filter out the impurities, and then the double-rod cylinder drives the connecting rod to drive the filter to move back into the inner groove. At this time, the top of the filter is scraped by the sealing scraper, and the impurities on the surface are scraped into the storage tank for storage, and then the upper cover plate opens and rises, and the piston plate moves to squeeze the shielding gas in the storage tank upward and lift it into the gas storage tank for repeated recycling. Then the relay is taken out and the next cycle is carried out. The three-station cycle processing.

[0010] As a further solution of the present invention: the processing groove is embedded, and the air nozzle is located above the relay. The argon-nitrogen mixed gas shielding gas, which is heavier than air, is injected through the air nozzle. The shielding gas sinks and squeezes the air upwards, so that the relay is surrounded by the shielding gas, resulting in a better welding effect.

[0011] As a further solution of the present invention: the sealing mechanism includes a sealing strip fixed under the upper cover plate, and the processing station also includes a sealing groove arranged around the side of the processing groove and interference fit with the sealing strip. When the upper cover plate descends, the sealing strip is driven downward to be squeezed into the sealing groove, and under pressure, it is deformed to fill the gap and seal it.

[0012] As a further solution of the present invention: a one-way exhaust port is provided on the top of the upper cover plate, which forms a positive pressure under the squeeze of the protective gas to discharge the top air, and the slightly positive pressure environment can prevent the outside air from entering.

[0013] As a further solution of the present invention: the filtering mechanism includes an inner groove opened in the inner cavity of the rotary welding table, one end of the inner groove is connected to the connecting groove, the side of the inner groove is slidably connected to a connecting rod driven by a double-rod cylinder, one end of the connecting rod is fixedly connected to a filter screen that penetrates and extends to the inner cavity of the inner groove, the inner cavity of the inner groove is fixedly connected to a sealing gasket that abuts the bottom of the filter screen, the inner cavity of the rotary welding table is provided with a receiving groove connected to the inner cavity of the inner groove, and the top of the inner cavity of the inner groove is fixedly connected to a sealing scraper for wiping impurities off the surface of the filter screen.

[0014] As a further solution of the present invention: a guide opening is provided on the surface of the rotary welding table and is connected to the receiving groove through a bolt sealing lock, and the residue in the receiving groove can be cleaned through the guide opening.

[0015] As a further solution of the present invention: the volume of the gas storage tank is greater than the volume of the processing tank and the upper cover plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Protective gas zero waste closed loop system The original five-step cycle of "injection-welding-recovery-filtration-regeneration" reduces argon consumption from 10L / piece to 0.5L / piece.

[0017] Micro-positive pressure + interference seal stabilizes the oxygen content in the welding area to less than 50ppm, and the oxidation rate of the solder joint is reduced from 5% to 0.08%.

[0018] 2. Automatic removal of welding slag The dynamic filter captures >99% of particles ≥50μm under negative pressure suction, and with the 45° inclined sealing scraper, the impurity removal rate is 100%.

[0019] The storage tank is removable, and the maintenance interval is extended from 8 hours to 1 week.

[0020] Gas-slag synchronous processing mechanism: piston plate air extraction and filter screen translation scraping slag timing linkage; Interference self-compensating seal: The trapezoidal sealing strip produces radial deformation under 0.2mm interference, and the high-temperature sealing force is increased by 3 times; Modular filter unit: The inner groove integrates filter screen / sealing scraper / storage slot to achieve quick cleaning in 5 seconds; Volume optimization design: gas storage tank volume > 1.5 times the sum of the processing tank + upper cover plate volume to ensure sufficient gas storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A top view of the structure of the present invention; Figure 2 It is a structural cross-sectional view of the rotary welding table of the present invention; Figure 3 For the present invention Figure 2 A partial enlarged view of point A in the middle.

[0022] In the figure: 1. Rotary welding table; 2. Processing tank; 3. Frame; 4. Upper cover plate; 5. Welding head; 6. Sealing strip; 7. Air nozzle; 8. Air storage tank; 9. Piston plate; 11. Connecting tank; 12. Filter screen; 13. Sealing gasket; 14. Sealing scraper; 15. Connecting rod; 16. Inner groove; 17. Double-rod cylinder; 18. Storage tank; 19. Sealing tank. DETAILED DESCRIPTION

[0023] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0024] See also Figure 1-3 The present invention provides a technical solution: a relay production welding device, comprising a rotary welding table 1 driven by a motor to rotate, the inner cavity of the rotary welding table 1 is provided with three evenly arranged processing stations for placing relays, and further comprising a loading mechanism arranged on the side of the rotary welding table 1 for loading materials and a welding mechanism for welding the relays in the processing stations; The processing station includes an air storage tank 8 and a processing tank 2 distributed sequentially from bottom to top in the inner cavity of the rotary welding table 1. The top of the air storage tank 8 is connected to the inner cavity of the processing tank 2 through a connecting groove 11. The inner cavity of the air storage tank 8 is slidably sealed with a piston plate 9 driven by a cylinder. The side of the processing tank 2 is connected to an air nozzle 7 connected to a shielding gas source. It also includes a filter mechanism arranged in the inner cavity of the rotary welding table 1 for filtering the shielding gas. The welding mechanism includes a frame 3 arranged on the side of the rotary welding table 1, the top of the frame 3 is slidably connected to an upper cover plate 4 driven by a driving mechanism, and a welding head 5 is built into the inner cavity of the upper cover plate 4. The bottom of the frame 3 is sealed with the processing station through a sealing mechanism. When in use, the shielding gas is injected downward through the air nozzle 7 in advance. Because the shielding gas is heavier than air, it sinks into the processing tank 2 and the gas storage tank 8, and then the relay is first placed in the processing tank 2 in the processing station through the loading mechanism, and then rotated 120 degrees to place the reed through the unloading mechanism, and then rotated 120 degrees to the bottom of the welding mechanism. At this time, the frame 3 drives the upper cover plate 4 to descend, driving the welding head 5 and the sealing strip 6 to descend. The sealing strip 6 is embedded in the sealing groove 19 to isolate the processing tank 2 from the outside world. At this time, the welding head 5 It descends to weld, and under the protection of the shielding gas, it prevents contact with oxygen in the air. After the processing is completed, there may be sputtered solid impurities in the air. At this time, the piston plate 9 descends to form a negative pressure in the air storage tank 8, and the shielding gas is drawn into the air storage tank 8, and then filtered through the filter 12 to filter out the impurities, and then the double-rod cylinder 17 drives the connecting rod 15 to drive the filter 12 to move back into the inner groove 16. At this time, the top of the filter 12 is scraped by the sealing scraper 14, and the impurities on the surface are scraped into the receiving groove 18 for storage, and then the upper cover plate 4 is opened and raised, and the piston plate 9 moves to squeeze the shielding gas in the receiving groove 18 upward and lift it into the air storage tank 8 for repeated recycling, and then the relay is taken out for the next cycle, and the three-station cycle processing.

[0025] The processing groove 2 is embedded, and the air nozzle 7 is located above the relay. The argon-nitrogen mixed gas shielding gas, which is heavier than air, is injected through the air nozzle 7. The shielding gas sinks and squeezes the air upwards, so that the relay is surrounded by the shielding gas, which makes the welding effect better.

[0026] The sealing mechanism includes a sealing strip 6 fixed under the upper cover plate 4. The processing station also includes a sealing groove 19 arranged around the side of the processing groove 2 and interference fit with the sealing strip 6. When the upper cover plate 4 descends, the sealing strip 6 is driven downward to be squeezed into the sealing groove 19. Under pressure, it deforms, fills the gap, and seals it.

[0027] A one-way exhaust port is provided on the top of the upper cover plate 4, which forms a positive pressure under the squeeze of the protective gas to discharge the top air, and the slightly positive pressure environment can prevent the outside air from entering.

[0028] The filtering mechanism includes an inner groove 16 opened in the inner cavity of the rotary welding table 1, one end of the inner groove 16 is connected to the connecting groove 11, and the side of the inner groove 16 is slidably connected to a connecting rod 15 driven by a double-rod cylinder 17. One end of the connecting rod 15 is fixedly connected to a filter screen 12 that penetrates and extends to the inner cavity of the inner groove 16. The inner cavity of the inner groove 16 is fixedly connected to a sealing gasket 13 that abuts the bottom of the filter screen 12. The inner cavity of the rotary welding table 1 is provided with a receiving groove 18 that is connected to the inner cavity of the inner groove 16. The top of the inner cavity of the inner groove 16 is fixedly connected to a sealing scraper 14 for wiping impurities off the surface of the filter screen 12.

[0029] A guide opening is provided on the surface of the rotary welding table 1 and is connected to the receiving groove 18 through a bolt sealing lock, and the residue in the receiving groove 18 can be cleaned through the guide opening.

[0030] The volume of the gas storage tank 8 is greater than the volume of the processing tank 2 and the upper cover plate 4.

[0031] When the present invention is used; Rotary welding station 1: It has three 120° evenly spaced workstations, a drive motor with a power of 0.75kW and a speed of 0.5rpm.

[0032] Processing groove 2: size 20mm×20mm×15mm, accommodating the relay substrate.

[0033] Air storage tank 8: volume 60cm 3 >2 times of the processing groove, connected to the processing groove through the connecting groove 11 with a diameter of 3mm.

[0034] Piston plate 9: silicone sealing ring + aluminum alloy base, driven by 0.6MPa cylinder, stroke ±10mm.

[0035] Welding mechanism: Upper cover plate 4: 304 stainless steel shell, built-in welding head 5 resistance welding power 3kW.

[0036] Sealing strip 6: High temperature resistant fluororubber, trapezoidal cross section design, upper width 8mm / lower width 10mm, interference with sealing groove 19 0.2mm.

[0037] Filter mechanism: Filter 12: 316L stainless steel sintered filter element with a pore size of 50 μm and an effective filtration area of ​​15 cm 2 .

[0038] Sealing scraper 14: made of polytetrafluoroethylene, with an inclination angle of 45° and a scraping efficiency of >98%.

[0039] Storage slot 18: volume 8cm 3 , the side wall is fixed with a removable cover bolt.

[0040] Workflow Step action details technical parameters 1. Protective gas pre-filling nozzle 7 injects argon and nitrogen mixed gas Ar70% / N230%, density 1.25kg / m 3 , fill the gas storage tank 8 at a flow rate of 3L / min → the oxygen content in the processing tank 2 is reduced to <100ppm.

[0041] 2. The workpiece loading mechanism places the relay into the processing slot 2 at station A. The rotary table 1 rotates 120° to station B to assemble the reed with a positioning accuracy of ±0.1mm.

[0042] 3. Dynamic seal welding station C: ① The frame 3 presses down the upper cover plate 4, and the sealing strip 6 is embedded in the sealing groove 19 to form a closed cavity.

[0043] ② The welding head 5 moves downward with a welding pressure of 200N / time of 0.3s.

[0044] ③ Release excess gas from the one-way exhaust port to maintain a slight positive pressure of 0.5kPa in the cavity and a sealing leakage rate of <0.1mL / min.

[0045] 4. The gas recovery piston plate 9 moves down 10 mm, sucking the gas → entering the inner groove 16 through the connecting groove 11 → the filter screen 12 intercepts the welding slag at a negative pressure of -5 kPa, and the extraction rate is 95%.

[0046] 5. The self-cleaning double-rod cylinder 17 drives the connecting rod 15 to retract 80 mm, and the filter screen 12 is scraped by the sealing scraper 14 → impurities fall into the receiving groove 18 with a scraping force of 15 N. The cleaning cycle is 5 seconds.

[0047] 6. The gas regeneration piston plate 9 moves upward, and the purified gas is pressed into the processing tank 2; the rotary table rotates to the next station and the gas recycling rate is greater than 95%.

[0048] Linkage control logic: Welding completion signal → triggers the piston plate 9 to move downward to pump air → the double-rod cylinder 17 acts to scrape slag → the piston plate 9 moves upward to inject air → the upper cover plate 4 opens.

[0049] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A relay production welding device, comprising a rotary welding table (1) driven to rotate by a motor, wherein the inner cavity of the rotary welding table (1) is provided with three evenly arranged processing stations for placing relays, characterized in that: It also includes a loading mechanism arranged on the side of the rotary welding table (1) for loading materials and a welding mechanism for welding relays in the processing station; The processing station includes an air storage tank (8) and a processing tank (2) distributed in sequence from bottom to top in the inner cavity of a rotary welding table (1), the top of the air storage tank (8) is connected to the inner cavity of the processing tank (2) through a connecting groove (11), the inner cavity of the air storage tank (8) is slidably sealed with a piston plate (9) driven by a cylinder, the side of the processing tank (2) is connected to an air nozzle (7) connected to a protective gas source, and also includes a filtering mechanism arranged in the inner cavity of the rotary welding table (1) for filtering the protective gas; The welding mechanism comprises a frame (3) arranged on the side of a rotary welding table (1); the top of the frame (3) is slidably connected to an upper cover plate (4) driven by a driving mechanism; a welding head (5) is built into the inner cavity of the upper cover plate (4); and the bottom of the frame (3) is sealed and connected to a processing station via a sealing mechanism.

2. A relay production welding device according to claim 1, characterized in that: The processing tank (2) is of embedded type, and the air nozzle (7) is located above the relay.

3. A relay production welding device according to claim 1, characterized in that: The sealing mechanism includes a sealing strip (6) fixed below the upper cover plate (4), and the processing station also includes a sealing groove (19) arranged around the side of the processing groove (2) and interference-fitted with the sealing strip (6).

4. A relay production welding device according to claim 1, characterized in that: A one-way exhaust port is provided on the top of the upper cover plate (4).

5. The relay production welding device according to claim 1, characterized in that: The filtering mechanism includes an inner groove (16) provided in the inner cavity of the rotary welding table (1), one end of the inner groove (16) is connected to the connecting groove (11), the side of the inner groove (16) is slidably connected to a connecting rod (15) driven by a double-rod cylinder (17), one end of the connecting rod (15) is fixedly connected to a filter screen (12) that passes through and extends to the inner cavity of the inner groove (16), the inner cavity of the inner groove (16) is fixedly connected to a sealing gasket (13) that abuts the bottom of the filter screen (12), the inner cavity of the rotary welding table (1) is provided with a receiving groove (18) that is connected to the inner cavity of the inner groove (16), and the top of the inner cavity of the inner groove (16) is fixedly connected to a sealing scraper (14) for wiping impurities off the surface of the filter screen (12).

6. A relay production welding device according to claim 1, characterized in that: The surface of the rotary welding table (1) is provided with a guide opening which is connected to the receiving groove (18) through a bolt sealing lock.

7. The relay production welding device according to claim 1, characterized in that: The volume of the gas storage tank (8) is greater than the volumes of the processing tank (2) and the upper cover plate (4).

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