A quick positioning and welding device and method for elbow pipe

Abstract

The application discloses a kind of elbow quick positioning welding device and method, including intermediate frequency inverter welding machine, the upper electrode base and lower electrode base of upper and lower distribution are equipped on the intermediate frequency inverter welding machine, the circulating cooling water path is equipped on the intermediate frequency inverter welding machine, the combined electrode is equipped between the upper electrode base and lower electrode base, elbow exhaust pipe is inserted and fixed in the combined electrode, compressor shell is placed on the intermediate frequency inverter welding machine, the compressor shell is between combined electrode and lower electrode base, elbow exhaust pipe is connected with compressor shell by steel ring, the present application reduces the cumbersome dismounting process and slow welding time when welding exhaust elbow on compressor shell, improves the production efficiency of elbow welding, so that the assembly volume of compressor can be reduced, the production cost of compressor can be reduced, the welding operation environment of elbow exhaust pipe is optimized, the welding step is simplified, and the employee happiness is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioner compressor processing technology, and in particular to a quick-positioning welding device and method for bending pipes. Background Technology

[0002] Currently, air conditioner compressor casings typically use vertically welded exhaust pipes. Vertical exhaust pipes are simple in structure, easy to position, and have high manufacturing precision. While elbow exhaust pipes can cleverly utilize space and reduce the compressor assembly volume, they are more complex in structure, more difficult to position, and require more assembly steps. In particular, welding is primarily done manually with flame welding, which is characterized by a poor welding environment and slow welding speed. Furthermore, complex positioning fixtures are needed, and the cumbersome disassembly and assembly process leads to a greater time commitment to welding parts together, resulting in increased product costs and lower production efficiency.

[0003] For example, the artificial flame welding process requires first positioning the compressor housing 4a and the elbow exhaust pipe 3a using a positioning fixture, which takes 15-20 seconds. After positioning, welding is performed using brazing filler metal, which takes 12-15 seconds. After welding, cooling takes 15-20 seconds, and then the positioning fixture is disassembled, which takes 15-20 seconds. The total welding time is 57-75 seconds, resulting in low production efficiency and high production costs. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of this invention is to improve the production efficiency of pipe bending welding, thereby reducing the assembly volume of the compressor, reducing the production cost of the compressor, and improving the overall production efficiency of the air conditioner.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a quick positioning welding device for bent pipes, including a medium-frequency inverter welding machine, wherein the medium-frequency inverter welding machine is provided with an upper electrode base and a lower electrode base distributed vertically, the medium-frequency inverter welding machine is provided with a circulating cooling water channel, a combined electrode is provided between the upper electrode base and the lower electrode base, a bent exhaust pipe is inserted into and fixed in the combined electrode, a compressor housing is placed on the medium-frequency inverter welding machine, the compressor housing is located between the combined electrode and the lower electrode base, and the bent exhaust pipe is connected to the compressor housing through a steel ring.

[0006] As a further improvement of the present invention: the combined electrode includes an upper groove electrode, the front end of the upper groove electrode is provided with an upper through-hole groove of a bent pipe, the bottom of the upper groove electrode is provided with a lower through-hole groove of a bent pipe that connects to the upper through-hole groove of the bent pipe, and the elbow exhaust pipe passes through the upper through-hole groove of the bent pipe and enters the lower through-hole groove of the bent pipe for limiting and fixing.

[0007] As a further improvement of the present invention: a middle electrode slot is provided at the bottom of the upper groove electrode, a positioning middle electrode piece is inserted into the middle electrode slot, the positioning middle electrode piece is provided with a through groove, the elbow exhaust pipe passes through the through groove of the positioning middle electrode piece into the upper groove electrode, and the upper end of the steel ring is engaged with the bottom opening of the through groove of the positioning middle electrode piece.

[0008] As a further improvement of the present invention: a tapered lower electrode is provided at the bottom of the steel ring, and the tapered lower electrode abuts between the lower electrode base and the steel ring.

[0009] As a further improvement of the present invention, the steel ring is a cone shape with a smaller top and a larger bottom.

[0010] As a further improvement of the present invention: a lower electrode slot is provided at the bottom of the conical lower electrode, and the lower electrode base is engaged in the lower electrode slot.

[0011] As a further improvement of the present invention: the top of the upper groove electrode protrudes upward to form an upper electrode retaining protrusion, which is engaged in the upper electrode base.

[0012] As a further improvement of the present invention: an upper positioning groove is provided at the front end of the upper groove electrode, an upper electrode positioning piece is provided in the upper positioning groove, and a groove for inserting and fixing the elbow exhaust pipe is formed below the upper electrode positioning piece.

[0013] A method for rapid positioning and welding of bent pipes, specifically including the following steps:

[0014] S1: Take the upper groove electrode, align the upper electrode protrusion of the upper groove electrode with the upper electrode base of the medium frequency inverter welding machine and insert it, then install the upper electrode positioning piece into the upper positioning groove.

[0015] S2: Take the tapered lower electrode, align the lower electrode slot of the tapered lower electrode with the lower electrode base of the medium frequency inverter welding machine, and insert and fix it.

[0016] S3: Take the elbow exhaust pipe, and pass the end of the elbow exhaust pipe away from the steel ring out from the inside of the compressor housing. Insert the steel ring into the compressor housing. Take the positioning electrode plate, and pass it through the end of the elbow exhaust pipe away from the steel ring, and make the bottom of the positioning electrode plate adhere to the upper surface of the compressor housing.

[0017] S4: Push the compressor housing with the elbow exhaust pipe into the operating platform of the medium frequency inverter welding machine, so that the bottom of the steel ring is inserted into the top of the conical lower electrode, and the elbow exhaust pipe is aligned with the lower end of the upper groove electrode and passes through the groove.

[0018] S5: Press the start button of the medium frequency inverter welding machine with both hands to start the medium frequency welding power supply and circulating water circuit, so that the upper electrode base and the lower electrode base are close to each other. The upper grooved electrode is quickly pressed down on the positioning electrode plate. During this period, the upper electrode positioning plate is adjusted left and right. The elbow exhaust pipe passes through the groove from the bottom of the elbow and through the groove from the top of the elbow. Finally, the upper grooved electrode, the steel ring, the compressor housing and the conical lower electrode conduct electricity together. The time is 5-10 seconds.

[0019] S6: After the operation is completed, the upper groove electrode rises rapidly. After the action stops, the positioning electrode plate and the compressor housing are removed, and the welding is completed.

[0020] As a further improvement of the present invention: the operating current of the medium frequency inverter welding machine is controlled at 30-60KA, the welding time is 80-110ms, and the gas pressure is 0.25-0.6Mpa.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This invention utilizes a medium-frequency inverter welding machine and combined electrodes to quickly position and weld an elbow exhaust pipe with a steel ring at the end onto the compressor housing. Compared to manual flame welding, this method reduces the cumbersome disassembly and assembly process and slow welding time when welding the exhaust elbow to the compressor housing, improves the production efficiency of elbow welding, thereby reducing the assembly volume of the compressor, reducing the production cost of the compressor, and improving the overall production efficiency of the air conditioner.

[0023] This invention optimizes the welding environment of elbow exhaust pipes, simplifies welding steps, and improves employee well-being. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a side view of the medium-frequency inverter welding machine of the present invention;

[0026] Figure 3 For the present invention Figure 1 Enlarged view at point A;

[0027] Figure 4 This is a schematic diagram of the elbow exhaust pipe of the present invention fixed inside the combined electrode;

[0028] Figure 5 This is a schematic diagram of the grooved electrode structure of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the upper electrode positioning plate of the present invention;

[0030] Figure 7 This is a schematic diagram of the electrode sheet structure in the positioning process of the present invention;

[0031] Figure 8 This is a schematic diagram of the conical lower electrode structure of the present invention;

[0032] Figure 9 This is a schematic diagram of the elbow exhaust pipe structure of the present invention.

[0033] The components include: 1. Medium-frequency inverter welding machine; 11. Upper electrode base; 12. Lower electrode base; 2. Combined electrode; 21. Upper grooved electrode; 211. Upper positioning groove; 212. Middle electrode slot; 213. Upper through-hole groove of bent pipe; 214. Lower through-hole groove of bent pipe; 215. Upper electrode protrusion; 22. Upper electrode positioning piece; 23. Positioning middle electrode piece; 24. Conical lower electrode; 241. Lower electrode slot; 3. Elbow exhaust pipe; 31. Steel ring; 4. Compressor housing. Detailed Implementation

[0034] The present invention will now be further described in conjunction with the accompanying drawings and embodiments: See below Figures 1-9 As shown, the present invention provides a rapid positioning welding device for bent pipes, including a medium-frequency inverter welding machine 1. The medium-frequency inverter welding machine 1 is provided with an upper electrode base 11 and a lower electrode base 12 distributed vertically. The medium-frequency inverter welding machine 1 is provided with a circulating cooling water channel. The output end of the circulating cooling water channel is directly opposite the upper electrode base 11 and the lower electrode base 12. A combined electrode 2 is provided between the upper electrode base 11 and the lower electrode base 12. The upper electrode base 11 and the lower electrode base 12 are energized by the combined electrode 2. A bent exhaust pipe 3 is inserted into and fixed in the combined electrode 2. A compressor housing 4 is placed on the medium-frequency inverter welding machine 1. The compressor housing 4 is located between the combined electrode 2 and the lower electrode base 12. The bent exhaust pipe 3 is connected to the compressor housing 4 through a steel ring 31. The combined electrode 2, after being energized, welds the bent exhaust pipe 3 to the compressor housing 4.

[0035] Preferably, the combined electrode 2 includes an upper grooved electrode 21, with a curved tube upper through-hole 213 at the front end of the upper grooved electrode 21 and a curved tube lower through-hole 214 at the bottom of the upper grooved electrode 21, which connects to the curved tube upper through-hole 213. The elbow exhaust pipe 3 passes through the curved tube upper through-hole 213 and into the curved tube lower through-hole 214 for limiting and fixing. The special shape structure of the upper grooved electrode 21 can be used to limit and support the elbow exhaust pipe 3.

[0036] Preferably, the bottom of the upper grooved electrode 21 is provided with a middle electrode slot 212, and a positioning middle electrode piece 23 is inserted into the middle electrode slot 212. The positioning middle electrode piece 23 is provided with a through groove. The elbow exhaust pipe 3 passes through the through groove of the positioning middle electrode piece 23 into the upper grooved electrode 21. The upper end of the steel ring 31 is engaged with the bottom opening of the through groove of the positioning middle electrode piece 23, so that the positioning middle electrode piece 23 limits the upper end of the steel ring 31.

[0037] Preferably, the bottom of the steel ring 31 is provided with a conical lower electrode 24, which abuts between the lower electrode base 12 and the steel ring 31, so that the conical lower electrode 24 limits the lower end of the steel ring 31.

[0038] Preferably, the steel ring 31 is a cone shape with a smaller top and a larger bottom.

[0039] Preferably, the bottom of the conical lower electrode 24 is provided with a lower electrode slot 241, and the lower electrode base 12 is engaged in the lower electrode slot 241. After the conical lower electrode 24 is engaged with the upper and lower electrode bases 12, it is energized.

[0040] Preferably, the top of the upper groove electrode 21 protrudes upward to form an upper electrode retaining protrusion 215, which is engaged in the upper electrode base 11, thereby increasing the connection stability between the upper groove electrode 21 and the upper electrode base 11.

[0041] Preferably, the upper groove electrode 21 has an upper positioning groove 211 at its front end, and an upper electrode positioning piece 22 is provided in the upper positioning groove 211. A groove for inserting and fixing the elbow exhaust pipe 3 is formed below the upper electrode positioning piece 22. By adjusting the position of the upper electrode positioning piece 22 in the upper positioning groove 211, the welding placement angle of the elbow exhaust pipe 3 can be adjusted.

[0042] This invention provides a method for rapid positioning and welding of bent pipes, specifically including the following steps:

[0043] S1: Take the upper groove electrode 21, align the upper electrode protrusion 215 of the upper groove electrode 21 with the upper electrode base 11 of the medium frequency inverter welding machine 1 and insert it, and then put the upper electrode positioning piece 22 into the upper positioning groove 211.

[0044] S2: Take the tapered lower electrode 24, align the lower electrode slot 241 of the tapered lower electrode 24 with the lower electrode base 12 of the medium frequency inverter welding machine 1 and insert and fix it.

[0045] S3: Take the elbow exhaust pipe 3, and pass the end of the elbow exhaust pipe 3 away from the steel ring 31 outward from the inside of the compressor housing 4. Insert the steel ring 31 into the compressor housing 4. Take the positioning electrode 23, and pass it through the end of the elbow exhaust pipe 3 away from the steel ring 31, and make the bottom of the positioning electrode 23 adhere to the upper surface of the compressor housing 4.

[0046] S4: Push the compressor housing 4 containing the elbow exhaust pipe 3 into the operating platform of the medium frequency inverter welding machine 1, so that the bottom of the steel ring 31 is inserted into the top of the conical lower electrode 24, and the elbow exhaust pipe 3 is aligned with the lower end of the upper groove electrode 21 through the groove 214.

[0047] S5: Press the start button of the medium frequency inverter welding machine 1 with both hands to start the medium frequency welding power supply and the circulating water circuit, so that the upper electrode base 11 and the lower electrode base 12 are close to each other. The upper grooved electrode 21 is quickly pressed down on the positioning electrode plate 23. During this period, the upper electrode positioning plate 22 is adjusted left and right. The elbow exhaust pipe 3 enters from the groove 214 under the elbow and exits from the groove 213 on the elbow. Finally, the upper grooved electrode 21, the steel ring 31, the compressor housing 4 and the conical lower electrode 24 conduct electricity together, which takes 5-10 seconds.

[0048] S6: After the operation is completed, the upper groove electrode 21 rises rapidly. After the action stops, the positioning electrode 23 and the compressor housing 4 are removed, and the welding is completed.

[0049] Preferably, the operating current of the medium-frequency inverter welding machine 1 is controlled at 30-60KA, the welding time is 80-110ms, and the gas pressure is 0.25-0.6MPa.

[0050] Working principle of the invention: The present invention provides a quick positioning welding device and method for bent pipes. By setting up a medium-frequency inverter welding machine 1 and a combined electrode 2, the bent exhaust pipe 3 with a steel ring 31 at the end is quickly positioned and welded onto the compressor housing 4. Compared with manual flame welding, this method reduces the cumbersome disassembly and assembly process and slow welding time when welding the exhaust pipe on the compressor housing 4, optimizes the welding operation environment, improves employee well-being, and increases the production efficiency of bent pipe welding. This can reduce the assembly volume of the compressor, thereby reducing the production cost of the compressor and improving the overall production efficiency of the air conditioner.

[0051] Implementation Case:

[0052] 1. Implementation of the equipment

[0053] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, it represents the configuration of the provided rapid welding equipment. The medium-frequency inverter welding machine 1 includes an upper electrode base 11 and a lower electrode base 12.

[0054] like Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the combined electrode 2 includes an upper groove electrode 21, an upper electrode positioning piece 22, a conical lower electrode 24, and a positioning middle electrode piece 23. The upper groove electrode 21 and the upper electrode positioning piece 22 form the upper electrode, which is mounted on the upper electrode base 11, and the conical lower electrode 24 is mounted on the lower electrode base 12.

[0055] like Figure 3 , Figure 4 , Figure 9As shown, a steel ring 31 is connected to the bottom end of the elbow exhaust pipe 3. The elbow exhaust pipe 3 passes through the compressor housing 4. The bottom of the steel ring 31 is aligned with the conical lower electrode 24. The elbow exhaust pipe 3 is fitted with a positioning electrode plate 23 to fix its position. The intermediate frequency power supply and the circulating water circuit are started.

[0056] 2. Process Implementation:

[0057] Once the above-mentioned equipment is prepared, welding will be carried out according to the prescribed process.

[0058] 1) The process parameter setting range is as follows:

[0059] The current should be controlled at 30-60 kA, the welding time at 80-110 ms, and the gas pressure at 0.25-0.6 MPa.

[0060] 2) Press the start button with both hands. The upper groove electrode 21 is quickly pressed down to the positioning electrode plate 23. During this time, the upper electrode positioning plate 22 is adjusted left and right. Finally, it conducts electricity together with the steel ring 31, the compressor housing 4 and the conical lower electrode 24. The time is 5-10 seconds.

[0061] 3) During operation, observe whether there are any abnormalities in the device, whether the welds are normal, and whether the electrodes are burned.

[0062] 4) After the operation is completed, the upper groove electrode 21 rises rapidly. After the action stops, the positioning electrode 23 and the compressor housing 4 are removed, and the welding is completed.

[0063] 5) Post-weld sampling shall be performed in accordance with standard ISO15614-12 for macroscopic cross-sectional inspection of the weld.

[0064] When t≥3mm (t is the thicker plate), the weld nugget width D≥4mm, where D=d1+d2, the weld is full.

[0065] Welding of C49 exhaust bends: Adjust current to 40KA, hold pressure at 0.45MPa for 90ms. d1 = 1.78mm, d2 = 4.11mm, D = 5.89mm. The weld is full and passes the test.

[0066] Based on the above-mentioned equipment and process, the process parameters were adjusted to weld the C49 exhaust bend. The current was adjusted to 65KA, the pressure was maintained at 0.65MPa, and after 120ms, the weld slag spattered, the shell was welded through and fell off, and the test failed.

[0067] The main function of this invention is that the medium-frequency inverter welding machine 1 and the combined electrode 2 are combined to fix the elbow exhaust pipe 3 and the compressor housing 4 between the upper electrode base 11 and the lower electrode base 12. Under certain medium-frequency inverter current, pressurization time and pressure, the medium-frequency inverter welding machine 1 and the combined electrode 2 weld the elbow exhaust pipe 3 with steel ring 31 at the end to the compressor housing 4.

[0068] The current is controlled at 30-60KA, the welding time is 80-110ms, and the gas pressure is 0.25-0.6MPa.

[0069] Macroscopic cross-sectional inspection of weld quality shall be conducted in accordance with standard ISO15614-12.

[0070] In summary, after reading this invention document, those skilled in the art can make various other corresponding modifications to the technical solutions and concepts based on this invention without creative mental effort, and all of these modifications fall within the scope of protection of this invention.

Claims

1. A rapid positioning welding device for pipe bending, comprising a medium-frequency inverter welding machine, characterized in that: The medium-frequency inverter welding machine is provided with an upper electrode base and a lower electrode base distributed vertically. The medium-frequency inverter welding machine is provided with a circulating cooling water circuit. A combined electrode is provided between the upper electrode base and the lower electrode base. An elbow exhaust pipe is inserted into and fixed inside the combined electrode. A compressor housing is placed on the medium-frequency inverter welding machine. The compressor housing is located between the combined electrode and the lower electrode base. The elbow exhaust pipe is connected to the compressor housing through a steel ring. The combined electrode includes an upper grooved electrode, the front end of which has an upper through-hole groove for a bent pipe, and the bottom of which has a lower through-hole groove for a bent pipe that connects to the upper through-hole groove. The elbow exhaust pipe passes through the upper through-hole groove and into the lower through-hole groove for limiting and fixing. The bottom of the upper grooved electrode is provided with a middle electrode slot, and a positioning middle electrode piece is inserted into the middle electrode slot. The positioning middle electrode piece is provided with a through groove. The elbow exhaust pipe passes through the through groove of the positioning middle electrode piece into the upper grooved electrode. The upper end of the steel ring is engaged with the bottom opening of the through groove of the positioning middle electrode piece.

2. The quick positioning and welding device for bending pipes according to claim 1, characterized in that: The bottom of the steel ring is provided with a conical lower electrode, which abuts between the lower electrode base and the steel ring.

3. The quick positioning and welding device for bending pipes according to claim 2, characterized in that: The steel ring is a cone shape, smaller at the top and larger at the bottom.

4. The quick positioning and welding device for bending pipes according to claim 2, characterized in that: The bottom of the conical lower electrode has a lower electrode slot, and the lower electrode base is engaged in the lower electrode slot.

5. A quick positioning and welding device for bending pipes according to claim 1 or 4, characterized in that: The top of the upper groove electrode protrudes upward to form an upper electrode retaining protrusion, which is engaged in the upper electrode base.

6. The quick positioning and welding device for bending pipes according to claim 1, characterized in that: The upper groove electrode has an upper positioning groove at its front end, and an upper electrode positioning piece is provided in the upper positioning groove. A groove for inserting and fixing the elbow exhaust pipe is formed below the upper electrode positioning piece.

7. The welding method using the quick positioning welding device for bending pipes as described in claim 1, characterized in that: Specifically, it includes the following steps: S1: Take the upper groove electrode, align the upper electrode protrusion of the upper groove electrode with the upper electrode base of the medium frequency inverter welding machine and insert it, then install the upper electrode positioning piece into the upper positioning groove. S2: Take the tapered lower electrode, align the lower electrode slot of the tapered lower electrode with the lower electrode base of the medium frequency inverter welding machine, and insert and fix it. S3: Take the elbow exhaust pipe, and pass the end of the elbow exhaust pipe away from the steel ring out from the inside of the compressor housing. Insert the steel ring into the compressor housing. Take the positioning electrode plate, and pass it through the end of the elbow exhaust pipe away from the steel ring, and make the bottom of the positioning electrode plate adhere to the upper surface of the compressor housing. S4: Push the compressor housing with the elbow exhaust pipe into the operating platform of the medium frequency inverter welding machine, so that the bottom of the steel ring is inserted into the top of the conical lower electrode, and the elbow exhaust pipe is aligned with the lower end of the upper groove electrode and passes through the groove. S5: Press the start button of the medium frequency inverter welding machine with both hands to start the medium frequency welding power supply and circulating water circuit, so that the upper electrode base and the lower electrode base are close to each other. The upper grooved electrode is quickly pressed down on the positioning electrode plate. During this period, the upper electrode positioning plate is adjusted left and right. The elbow exhaust pipe passes through the groove from the bottom of the elbow and through the groove from the top of the elbow. Finally, the upper grooved electrode, the steel ring, the compressor housing and the conical lower electrode conduct electricity together. The time is 5-10 seconds. S6: After the operation is completed, the upper groove electrode rises rapidly. After the action stops, the positioning electrode plate and the compressor housing are removed, and the welding is completed.

8. The welding method according to claim 7, characterized in that: The operating current of the medium-frequency inverter welding machine is controlled at 30-60KA, the welding time is 80-110ms, and the gas pressure is 0.25-0.6MPa.

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