A method of producing a thermocouple

Abstract

The application relates to a production method of a thermocouple, belonging to the technical field of vice guns, and comprising the following steps: (1) welding of a couple of wires; (2) wire threading; (3) annealing; (4) fixing of the couple of wires; (5) polarity detection; (6) assembly of a compensation lead; (7) compensation lead welding; (8) polarity detection; (9) fixing of the compensation lead; (10) sleeve installation; (11) moisturizing; and (12) drying. The produced thermocouple is stable in quality, the phenomenon of line non-conduction or poor connection does not occur, the test success rate of the vice gun probe is improved, the measurement accuracy is high, and batch production of the thermocouple can be realized.

Description

Technical Field

[0001] This invention relates to a method for producing thermocouples, belonging to the field of secondary gun technology. Background Technology

[0002] To improve steelmaking efficiency and quality, some modern steel plants both domestically and internationally have equipped their converters with auxiliary lances on the top of the converter. During converter blowing, without tilting the converter, the auxiliary lance is used to measure parameters such as molten steel temperature and carbon content. The auxiliary lance probe is a disposable consumable used during measurement. Thermocouples are the main measuring components of the auxiliary lance probe, and their success rate and accuracy directly affect steelmaking efficiency and steel quality.

[0003] Currently, during the production process of thermocouples, issues such as circuit non-conductivity or poor connection frequently occur, leading to a decrease in the success rate and measurement accuracy of the auxiliary probe. Therefore, improving the quality of thermocouples and enhancing their success rate and measurement accuracy are key and challenging issues in thermocouple production. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a thermocouple production method that addresses the above-mentioned shortcomings. The thermocouples produced by the present invention have stable quality and do not have problems such as circuit non-conductivity or poor connection. It improves the test success rate and measurement accuracy of the sub-gun probe and enables mass production of thermocouples.

[0005] To solve the above technical problems, the present invention adopts the following technical solution: a method for producing a thermocouple, comprising the following steps:

[0006] (1) Couple wire welding: Couple wires include positive couple wires and negative couple wires. The positive couple wires and negative couple wires are welded together using a couple wire welding machine, and then cut using a couple wire cutting machine.

[0007] (2) Threading the coupler wire: Use tweezers to thread the welded and cut coupler wire into the U-shaped quartz tube;

[0008] (3) Annealing: The U-shaped quartz tube with the ferrule inserted is placed into a quartz cup and placed in an annealing furnace and annealed at 1100℃ for 4 hours;

[0009] (4) Fixing the coupler wires: Place the welding points of the positive and negative coupler wires at the center of the U-shaped quartz tube, and then apply glue to both ends of the U-shaped quartz tube to fix the coupler wires;

[0010] (5) Polarity detection: Use a polarity detector to check whether the positive and negative poles of the coupler wire are correct. If they pass, proceed to the next step.

[0011] (6) Assemble the compensating wire: Insert the compensating wire into the corresponding hole of the bracket. The distance between the upper end of the compensating wire and the protrusion of the bracket is 3-5mm. Adjust the welding boss to the front.

[0012] (7) Welding of compensating wires: The positive and negative dipole wires are welded to the welding bosses of the corresponding compensating wires using a dipole wire welding machine.

[0013] (8) Polarity test: Use a polarity tester to check the continuity and polarity of the welding compensating wire after welding. If it passes, proceed to the next step.

[0014] (9) Fixing the compensating wire: Apply glue to the joint between the compensating wire and the bracket to fix it;

[0015] (10) Inserting the sleeve: Insert the fixed workpiece into the sleeve and fill the sleeve with high-temperature resistant castable;

[0016] (11) Moisturizing: Place the assembled sleeve into a moisturizing oven and keep it moist for 6 hours before removing it;

[0017] (12) Drying: Place the moisturized sleeve into a drying oven and dry for 6 hours before taking it out.

[0018] As a further improvement to the above technical solution:

[0019] The positive electrode wire is a platinum-rhodium 10 wire, and the negative electrode wire is a platinum wire. The wire is cut to a length of 80mm using a wire cutting machine. Both the positive and negative electrode wires are 40mm long.

[0020] The twin wire cutting machine in the above steps includes a base plate with a sliding groove. A box is located at the center of the base plate. Sliding seats are slidably connected in the sliding grooves on both sides of the box. A vertical plate is provided on the sliding seat. A cutting component is provided on the vertical plate. The cutting component includes a first blade and a second blade. The second blade is in close contact with the vertical plate, and the first blade is in close contact with the second blade. A rotating shaft is connected to the lower ends of the first blade and the second blade. The rotating shaft passes through the lower ends of the first blade and the second blade. The first blade is rotatably connected to the rotating shaft, and the second blade is fixedly connected to the rotating shaft.

[0021] The rotating shaft extends through the upright plate. The end of the rotating shaft near the box body has a thread, and a clamping nut is threadedly connected to the rotating shaft. A third spring is provided on the rotating shaft between the clamping nut and the two blades. A punch is fixed to the side of the first blade on one of the upright plates near the box body. The punch has a protrusion. The lower end of the punch is hinged through the rotating shaft. A die is fixedly connected to the end of the upright plate near the second blade. The die has a groove. The punch and die correspond to each other, and the protrusion and groove cooperate.

[0022] The upright plate is provided with a strip-shaped hole, and a second shaft is slidably connected in the strip-shaped hole. The two ends of the second shaft pass through the box body and the strip-shaped holes on the two upright plates, respectively.

[0023] The box is equipped with a baffle, and a second pull wire is connected to the second shaft inside the box. The second pull wire passes through the baffle and is connected to a second foot switch. A fourth spring is provided on the second pull wire between the baffle and the second shaft. The lower end of the first blade is rotatably connected to the second shaft.

[0024] The box body has a support base at the center of the front side, and the support base has an arc-shaped protrusion ring.

[0025] The coupled wire welding machine in the above steps includes a base, a first support on the base, the first support being perpendicular to the base, a crossbeam connected to the upper end of the first support, the crossbeam being perpendicular to the first support, a first shaft on the crossbeam, the first shaft being perpendicular to the crossbeam, the upper end of the first shaft passing through the crossbeam and the lower end passing through the base and slidingly connected to the crossbeam and the base, the lower end of the first shaft being connected to a first pull wire, the first pull wire being connected to a first foot switch; a first electrode seat is provided below the crossbeam, the shaft is located at one end of the first electrode seat, a first electrode is provided at the end of the first electrode seat away from the shaft, a second electrode seat is provided on the base directly below the first electrode, and a second electrode is provided on the second electrode seat.

[0026] A second bracket is fixedly connected to the lower part of the first electrode holder. The second bracket is "┒" shaped. A slider is fixedly connected to the lower end of the second bracket. A slide rail is fixedly connected to the lower end of the first bracket. The slide rail and the slider are slidably connected. A sleeve is provided above the crossbeam. A pressure cap is provided above the sleeve. A shaft passes through the sleeve and the pressure cap and is slidably connected to the pressure cap. A second spring is provided on the shaft between the first electrode holder and the pressure cap.

[0027] The second bracket has a switch seat below it. A shaft passes through the switch seat and is fixedly connected to the switch seat. A first spring is provided on the shaft between the switch seat and the base. A normally closed switch is provided on the switch seat. The normally closed switch is electrically connected to the power supply, the first electrode and the second electrode. The normally closed switch has a spring piece. The second bracket presses the spring piece tightly.

[0028] The present invention adopts the above technical solution and has the following advantages: the thermocouples produced by the present invention have stable quality and will not have the phenomenon of circuit non-conductivity or poor connection. It improves the test success rate and measurement accuracy of the auxiliary gun probe and enables the mass production of thermocouples.

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the thermocouple structure in an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the wire welding machine in an embodiment of the present invention.

[0032] Figure 3This is a schematic diagram of the structure of the twin wire cutting machine in an embodiment of the present invention;

[0033] Figure 4 yes Figure 3 A top view of the structure after rotating it 90 degrees clockwise;

[0034] Figure 5 yes Figure 4 Enlarged view of part A in the middle;

[0035] Figure 6 This is a schematic diagram of the structure of the support base and the arc-shaped protrusion plate in an embodiment of the present invention.

[0036] In the picture,

[0037] 1-Positive dipole wire, 2-Negative dipole wire, 3-U-shaped quartz tube, 4-Welding point, 5-Compensating wire, 6-Bracket, 7-Sleeve, 8-High-temperature resistant castable, 9-Base, 10-First bracket, 11-Crossbeam, 12-First shaft, 13-First pull wire, 14-First foot switch, 15-First electrode holder, 16-First electrode, 17-Second electrode holder, 18-Second electrode, 19-Insulating pad, 20-Second bracket, 21-Slider, 22-Slide rail, 23-Switch holder, 24-First spring, 25-Normally closed switch, 26-Sleeve, 2 7-Cover, 28-Second spring, 29-Spring piece, 30-Base plate, 31-Slide groove, 32-Box body, 33-Sliding seat, 34-Upright plate, 35-First blade, 36-Second blade, 37-Rotating shaft, 38-Clamping nut, 39-Third spring, 40-Punch, 41-Protrusion, 42-Die, 43-Groove, 44-Strip hole, 45-Second shaft, 46-Baffle, 47-Second pull wire, 48-Second foot switch, 49-Fourth spring, 50-Support seat, 51-Arc-shaped protrusion, 52-Bracket protrusion, 53-Welding boss. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Example

[0041] like Figure 1 As shown, a thermocouple includes a sheath 7, inside which is a high-temperature resistant castable 8. A U-shaped quartz tube 3 is provided at the upper part of the sheath 7 and is inserted into the high-temperature resistant castable 8 at the upper part of the sheath 7. A positive electrode wire 1 and a negative electrode wire 2 are welded together inside the U-shaped quartz tube 3. A support 6 is provided at the lower part of the sheath 7 and is inserted into the high-temperature resistant castable 8 at the lower part of the sheath 7. Two compensating wires 5 are provided on the support 6 and are respectively connected to the positive electrode wire 1 and the negative electrode wire 2.

[0042] A method for producing a thermocouple includes the following steps:

[0043] (1) Couple wire welding: The couple wires include positive couple wire 1 and negative couple wire 2. Positive couple wire 1 is a platinum-rhodium 10 wire and negative couple wire 2 is a platinum wire. Positive couple wire 1 and negative couple wire 2 are welded together with a couple wire welding machine and then cut to 80mm length with a couple wire cutting machine. Positive couple wire 1 and negative couple wire 2 are both 40mm.

[0044] (2) Threading the coupler wire: Use tweezers to thread the welded and cut coupler wire into the U-shaped quartz tube 3;

[0045] (3) Annealing: The U-shaped quartz tube 3 with the ferrule inserted is placed into the quartz cup and placed in the annealing furnace and annealed at 1100℃ for 4 hours;

[0046] (4) Fixing the coupler wires: Place the welding point 4 of the positive coupler wire 1 and the negative coupler wire 2 at the center of the U-shaped quartz tube, and then apply glue to both ends of the U-shaped quartz tube to fix the coupler wires.

[0047] (5) Polarity detection: Use a polarity detector to check whether the positive and negative poles of the coupler wire are correct. If they pass, proceed to the next step.

[0048] (6) Assemble the compensating wire: Insert the compensating wire 5 into the corresponding hole of the bracket 6. The distance between the upper end of the compensating wire 5 and the bracket protrusion 52 is 3-5mm. Adjust the welding protrusion 53 to the front.

[0049] (7) Welding of compensating wires: The positive electrode wire 1 and the negative electrode wire 2 are welded to the welding boss 53 of the corresponding compensating wire 5 using a wire welding machine;

[0050] (8) Polarity test: Use a polarity tester to check the continuity of the welding compensating wire 5 and whether the positive and negative poles of the coupler wire are correct. If it passes, proceed to the next step.

[0051] (9) Fixing the compensating wire: Use a hot melt gun to apply glue to the joint between the compensating wire 5 and the bracket 6 to fix it;

[0052] (10) Inserting the sleeve: Insert the fixed workpiece into the sleeve 7 and fill the sleeve 7 with high temperature resistant castable 8;

[0053] (11) Moisturizing: Place the assembled sleeve 7 into a moisturizing oven and moisturize for 6 hours before removing it;

[0054] (12) Drying: Place the moisturized sleeve 7 into the drying oven and dry for 6 hours before taking it out.

[0055] The twin wire welding machine in the steps, such as Figure 2 As shown, the device includes a base 9, on which a first support 10 is mounted. The first support 10 is perpendicular to the base 9. A crossbeam 11 is connected to the upper end of the first support 10. The crossbeam 11 is perpendicular to the first support 10. A first shaft 12 is mounted on the crossbeam 11. The first shaft 12 is perpendicular to the crossbeam 11. The upper end of the first shaft 12 extends through the crossbeam 11, and the lower end extends through the base 9 and is slidably connected to the crossbeam 11 and the base 9. A first pull wire 13 is connected to the lower end of the first shaft 12. The first pull wire 13 is connected to a first foot switch 14.

[0056] A first electrode seat 15 is provided below the crossbeam 11. A first shaft 12 passes through the first electrode seat 15 and is slidably connected to the first electrode seat 15. The first shaft 12 is located at one end of the first electrode seat 15. A first electrode 16 is provided at the end of the first electrode seat 15 away from the first shaft 12. A second electrode seat 17 is provided on the base 9 directly below the first electrode 16. A second electrode 18 is provided on the second electrode seat 17. An insulating pad 19 is provided between the second electrode seat 17 and the base 9. A second bracket 20 is fixedly connected below the first electrode seat 15. The second bracket 20 is "┒" shaped. A slider 21 is fixedly connected to the lower end of the second bracket 20. A slide rail 22 is fixedly connected to the lower end of the first bracket 10. The slide rail 22 is slidably connected to the slider 21. The first shaft 12 passes through the second bracket 20 in sequence and is slidably connected to the second bracket 20.

[0057] A switch base 23 is provided below the second bracket 20. The first shaft 12 passes through the switch base 23 and is fixedly connected to the switch base 23. A first spring 24 is provided on the first shaft 12 between the switch base 23 and the base 9. A normally closed switch 25 is provided on the switch base 23. The normally closed switch 25 is electrically connected to the power supply, the first electrode 16 and the second electrode 18. The normally closed switch 25 has a spring piece 29. A sleeve 26 is provided above the crossbeam 11. A pressure cap 27 is provided above the sleeve. The first shaft 12 passes through the sleeve 26 and the pressure cap 27 and is slidably connected to the pressure cap 27. A second spring 28 is provided on the first shaft 12 between the first electrode base 15 and the pressure cap 27. Under the action of the first spring 24 and the second spring 28, the second bracket 20 presses the spring piece 29 tightly. At this time, the circuit is not connected, and the first electrode 16 and the second electrode 18 are not energized.

[0058] The twin wire cutting machine in the steps, such as Figure 3-6As shown, the device includes a base plate 30 with a rectangular groove 31. A box 32 is located at the center of the base plate 30. Sliding seats 33 are slidably connected to the grooves 31 on both sides of the box 32. A vertical plate 34 is provided on the sliding seat 33 and is perpendicular to the sliding seat 33. A cutting component is provided on the vertical plate 34, which includes a first blade 35 and a second blade 36. The second blade 36 is in close contact with the vertical plate 34, and the first blade 35 is in close contact with the second blade 36. A rotating shaft 37 is connected to the lower ends of the first blade 35 and the second blade 36. The rotating shaft 37 passes through the lower ends of the first blade 35 and the second blade 36, and the first blade 35 is rotatably connected to the rotating shaft 37. Next, the second blade 36 is fixedly connected to the rotating shaft 37, which extends out of the upright plate 34. The end of the rotating shaft 37 near the box 32 has a thread, and the rotating shaft 37 is threadedly connected to a clamping nut 38. A third spring 39 is provided on the rotating shaft 37 between the clamping nut 38 and the two blades. A punch 40 is fixed on the side of the first blade 35 on one of the upright plates 34 near the box 32. The punch 40 has a protrusion 41, and the lower end of the punch 40 is hinged through the rotating shaft 37. A die 42 is fixedly connected to the end of the upright plate 34 near the second blade 36. The die 42 has a groove 43. The punch 40 and the die 42 correspond to each other, and the protrusion 41 and the groove 43 cooperate.

[0059] The upright plate 34 is provided with a strip hole 44, and a second shaft 45 is slidably connected in the strip hole 44. The two ends of the second shaft 45 pass through the box body 32 and the strip hole 44 on the two upright plates 34 respectively. A baffle 46 is provided in the box body 32. A second pull wire 47 is connected to the position of the second shaft 45 inside the box body 32. The second pull wire 47 passes through the baffle 46 and is connected to a second foot switch 48. A fourth spring 49 is provided on the second pull wire 47 between the baffle 46 and the second shaft 45. The lower end of the first blade 35 is rotatably connected to the second shaft 45.

[0060] A support base 50 is provided at the center of the front side of the box body 32. An arc-shaped protruding ring 51 is provided on the support base 50. The arc-shaped protruding ring 51 is located at the center of the two upright plates 34 as a centering reference.

[0061] During operation, the operator places the positive electrode wire 1 and the negative electrode wire 2 to be welded between the first electrode 16 and the second electrode 18 of the wire welding machine, aligns them correctly, and then steps on the first foot switch 14. The first foot switch 14 drives the first shaft 12 downward through the first pull wire 13. The first shaft 12 drives the switch seat 23 downward, and the first electrode seat 15 is pressed down under the action of the second spring 28, thereby driving the first electrode 16 downward. When the first electrode 16 and the second electrode 18 press the two types of wires tightly, the first shaft 12 continues to move downward, driving the switch seat 23 to continue downward. The spring 2 of the normally closed switch 25... 9. After leaving the second support 20, the circuit is turned on, and the first electrode 16 and the second electrode 18 are energized to weld the two types of ferrules together. Then, the weld points of the two types of ferrules are aligned with the arc-shaped protrusion 51 of the ferrule cutting machine. The second foot switch 48 is stepped on, and the second foot switch 48 pulls the second shaft 45 through the second pull wire 47, thereby driving the first blade 35 to cut the ferrules. At this time, the two types of ferrules cut by the two cutting components are of the same length. At the same time as cutting, the punch 40 and the die 42 will press indentations on one type of ferrule to prevent the two types of ferrules from being indistinguishable after welding and cutting.

[0062] The thermocouples produced by this invention are of stable quality and will not have problems such as circuit non-conductivity or poor connection. They improve the test success rate and measurement accuracy of the sub-gun probe and enable mass production of thermocouples.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for producing a thermocouple, characterized in that: Includes the following steps: (1) Couple wire welding: Couple wires include positive couple wire (1) and negative couple wire (2). The positive couple wire (1) and negative couple wire (2) are welded together using a couple wire welding machine, and then cut using a couple wire cutting machine. (2) Threading the coupler wire: Use tweezers to thread the welded and cut coupler wire into the U-shaped quartz tube (3); (3) Annealing: The U-shaped quartz tube (3) with the ferrule inserted is placed into the quartz cup and placed in the annealing furnace and annealed at 1100℃ for 4 hours; (4) Fixing the coupler wires: Place the welding point (4) of the positive coupler wire (1) and the negative coupler wire (2) at the center of the U-shaped quartz tube, and then apply glue to both ends of the U-shaped quartz tube to fix the coupler wires; (5) Polarity detection: Use a polarity detector to check whether the positive and negative poles of the coupler wire are correct. If they pass, proceed to the next step. (6) Assemble the compensating wire: Insert the compensating wire (5) into the corresponding hole of the bracket (6). The distance between the upper end of the compensating wire (5) and the bracket protrusion (52) is 3-5mm. Adjust the welding boss (53) to the front. (7) Welding of compensating wires: The positive electrode wire (1) and the negative electrode wire (2) are welded to the welding boss (53) of the corresponding compensating wire (5) using a wire welding machine; (8) Polarity test: Use a polarity tester to test the continuity of the welding compensating wire (5) and whether the positive and negative poles of the coupler wire are correct. If it passes, proceed to the next step. (9) Fix the compensating wire: Apply glue to the joint between the compensating wire (5) and the bracket (6) to fix it; (10) Inserting the sleeve: Insert the fixed workpiece into the sleeve (7) and fill the sleeve (7) with high temperature resistant casting material (8); (11) Moisturizing: Place the assembled sleeve (7) into a moisturizing oven and moisturize for 6 hours before removing it; (12) Drying: Place the moisturized sleeve (7) into a drying oven and dry for 6 hours before removing it; The twin wire cutting machine in step (1) includes a base plate (30), a groove (31) on the base plate (30), a box (32) at the center of the base plate (30), sliding seats (33) on both sides of the groove (31) of the box (32) respectively, a vertical plate (34) on the sliding seat (33), and a cutting component on the vertical plate (34). The cutting component includes a first blade (35) and a second blade (36). The second blade (36) is close to the vertical plate (34), and the first blade (35) is close to the second blade (36). The lower ends of the first blade (35) and the second blade (36) are connected to a rotating shaft (37). The rotating shaft (37) passes through the lower ends of the first blade (35) and the second blade (36). The first blade (35) is rotatably connected to the rotating shaft (37), and the second blade (36) is fixedly connected to the rotating shaft (37).

2. The method for producing a thermocouple according to claim 1, characterized in that: The positive dipole wire (1) is a platinum-rhodium 10 wire, and the negative dipole wire (2) is a platinum wire. The wire is cut to a length of 80mm using a dipole wire cutting machine. The positive dipole wire (1) and the negative dipole wire (2) are both 40mm.

3. The method for producing a thermocouple according to claim 2, characterized in that: The rotating shaft (37) extends out of the upright plate (34). The end of the rotating shaft (37) near the box body (32) has a thread. The rotating shaft (37) is threadedly connected to a clamping nut (38). A third spring (39) is provided on the rotating shaft (37) between the clamping nut (38) and the two blades. A punch (40) is fixed on the side of the first blade (35) on one of the upright plates (34) near the box body (32). A protrusion (41) is provided on the punch (40). The lower end of the punch (40) is hinged through the rotating shaft (37). A cavity (42) is fixedly connected to the end of the upright plate (34) near the second blade (36). A groove (43) is provided on the cavity (42). The punch (40) and the cavity (42) correspond to each other. The protrusion (41) and the groove (43) cooperate with each other.

4. A method for producing a thermocouple according to claim 3, characterized in that: The upright plate (34) is provided with a strip hole (44), and a second shaft (45) is slidably connected in the strip hole (44). The two ends of the second shaft (45) pass through the box body (32) and the strip hole (44) on the two upright plates (34), respectively.

5. A method for producing a thermocouple according to claim 4, characterized in that: The box (32) is provided with a baffle (46), and the second shaft (45) is located inside the box (32) and connected to a second pull wire (47). The second pull wire (47) passes through the baffle (46) and is connected to a second foot switch (48). A fourth spring (49) is provided on the second pull wire (47) between the baffle (46) and the second shaft (45). The lower end of the first blade (35) is rotatably connected to the second shaft (45).

6. A method for producing a thermocouple according to claim 5, characterized in that: The box body (32) has a support base (50) at the center of the front side, and an arc-shaped protrusion (51) is provided on the support base (50).

7. A method for producing a thermocouple according to claim 6, characterized in that: The wire welding machine in step (1) includes a base (9), on which a first support (10) is provided. The first support (10) is perpendicular to the base (9). A crossbeam (11) is connected to the upper end of the first support (10). The crossbeam (11) is perpendicular to the first support (10). A first shaft (12) is provided on the crossbeam (11). The first shaft (12) is perpendicular to the crossbeam (11). The upper end of the first shaft (12) passes through the crossbeam (11), and the lower end passes through the base (9) and connects with the crossbeam (11) and the base (9). The first shaft (12) is connected to a sliding connection. The lower end of the first shaft (12) is connected to a first pull wire (13), and the first pull wire (13) is connected to a first foot switch (14). The first electrode seat (15) is provided below the crossbeam (11). The first shaft (12) is located at one end of the first electrode seat (15). The first electrode (16) is provided at the end of the first electrode seat (15) away from the first shaft (12). The second electrode seat (17) is provided on the base (9) directly below the first electrode (16). The second electrode (18) is provided on the second electrode seat (17).

8. A method for producing a thermocouple according to claim 7, characterized in that: A second bracket (20) is fixedly connected to the lower part of the first electrode seat (15). The second bracket (20) is "┒" shaped. A slider (21) is fixedly connected to the lower end of the second bracket (20). A slide rail (22) is fixedly connected to the lower end of the first bracket (10). The slide rail (22) is slidably connected to the slider (21). A sleeve (26) is provided above the crossbeam (11). A pressure cap (19) is provided above the sleeve. A first shaft (12) passes through the sleeve (26) and the pressure cap (19) and is slidably connected to the pressure cap (19). A second spring (28) is provided on the first shaft (12) between the first electrode seat (15) and the pressure cap (19).

9. A method for producing a thermocouple according to claim 8, characterized in that: A switch seat (23) is provided below the second bracket (20). A first shaft (12) passes through the switch seat (23) and is fixedly connected to the switch seat (23). A first spring (24) is provided on the first shaft (12) between the switch seat (23) and the base (9). A normally closed switch (25) is provided on the switch seat (23). The normally closed switch (25) is electrically connected to the power supply, the first electrode (16) and the second electrode (18). The normally closed switch (25) has a spring piece (29). The second bracket (20) presses the spring piece (29) tightly.

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