A welding device for titanium heat exchanger processing

Abstract

The present invention relates to the technical field of welding equipment, and specifically discloses a welding equipment for the processing of titanium heat exchangers, including a bottom plate, a tube sheet and titanium alloy tubes. A positive and negative thread bidirectional lead screw is rotatably installed on the bottom plate, and internal thread blocks are sleeved on the two threaded rods of the positive and negative thread bidirectional lead screw with opposite thread directions. A limiting mechanism for limiting the internal thread blocks is arranged on the bottom plate. In the present invention, the inside of the sealing shell is filled with argon to wrap the weld seam, thereby providing protection during argon arc welding of the weld seam, avoiding the phenomenon that the weld seam absorbs hydrogen when heated and is prone to brittle fracture in the later stage. Using two sealing shells to completely seal the weld seam between the tube sheet and the titanium alloy tube can prevent hydrogen in the external air from being absorbed by the weld seam during welding, can isolate the hydrogen in the external air from the weld seam, and avoid the phenomenon that the weld seam absorbs hydrogen when heated during welding.

Description

Technical Field

[0001] The present invention relates to the technical field of welding equipment, and particularly relates to a welding equipment for processing titanium heat exchangers. Background Art

[0002] A titanium heat exchanger is a heat exchange device made of high-quality titanium tubes that transfers part of the heat of a hot fluid to a cold fluid.

[0003] After retrieval, it is found that the Chinese patent with the application number 201610396529.9 discloses "an electron beam welding method for tubes and tube sheets in a titanium alloy heat exchanger. The tubes and tube sheets assembled with a tooling are fixed on the rotating table of an electron beam welding machine. The rotating table is located on an XY workbench, and the XY workbench includes an X track and a Y track perpendicular to each other. The center coordinates of the tube to be welded are (x1, y1), and the center coordinates of the rotating table are (x0, y0). First, move the XY workbench to make the center of the electron gun located at the position of (x1 + R + L, y1). Then, adjust the electron gun to move its beam spot to (x1 + R, y1). Next, while the rotating table rotates uniformly, adjust the XY workbench to make the rotating table move along the X track and the Y track to keep the center of the tube to be welded at the position of (x1, y1) and rotate uniformly, and weld the connection between the tube to be welded at the position of (x1 + R, y1) and the tube sheet with an electron gun with a fixed emission position and direction". However, when welding the weld between the tube sheet and the titanium alloy tube by the above electron beam welding method for tubes and tube sheets in a titanium alloy heat exchanger, the weld between the tube sheet and the titanium alloy tube is exposed to the outside. When welding the weld between the tube sheet and the titanium alloy tube, the titanium alloy tube will absorb hydrogen when the temperature rises due to heat, resulting in easy brittle fracture of the titanium alloy tube. Therefore, in order to solve such problems, a welding equipment for processing titanium heat exchangers is proposed. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art, and a welding equipment for processing titanium heat exchangers is proposed.

[0005] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0006] A welding equipment for processing titanium heat exchangers includes a bottom plate, a tube sheet and a titanium alloy tube. A left - right hand double - lead screw is rotatably installed on the bottom plate. Inner - threaded blocks are sleeved on both threaded rods of the left - right hand double - lead screw with opposite thread directions. A limiting mechanism for limiting the inner - threaded blocks is arranged on the bottom plate. Sealing mechanisms for sealing the welding joints of the tube sheet and the titanium alloy tube are arranged on both inner - threaded blocks.

[0007] The sealing mechanism includes a first electric telescopic rod installed on the top of the internal thread block. The end of the piston rod of the first electric telescopic rod is connected to a mounting block. The top of the mounting block is connected to a fixing frame. The end of the fixing frame is installed with a strip plate. A sealing shell is slidably installed on the side of the strip plate. A welding assembly is rotatably arranged in the sealing shell.

[0008] Preferably, the welding assembly includes an annular third guide rail installed on the inner bottom wall of the sealing shell. A third electric slider is slidably installed on the third guide rail. A rectangular plate is installed on the side of the third electric slider. A fourth guide rail is installed on the side of the rectangular plate. A fourth electric slider is slidably installed on the fourth guide rail. A first mounting plate is installed on the side of the fourth electric slider. A third mounting plate is installed on the side of the first mounting plate. A third motor is installed on the side of the third mounting plate. The output shaft of the third motor is connected to a fourth mounting plate. A second electric telescopic rod and a third electric telescopic rod are installed on the side of the fourth mounting plate. The end of the piston rod of the second electric telescopic rod is installed with a triangular alumina grinding wheel. The weld between the tube sheet and the titanium alloy tube can be in contact with the end of the triangular alumina grinding wheel. The end of the piston rod of the third electric telescopic rod is installed with an argon arc welding gun head.

[0009] Preferably, an annular cavity is formed inside the sealing shell. A plurality of air injection holes communicating with the cavity are formed on the inner ring wall of the sealing shell. The bottom of the outer wall of the sealing shell is provided with an air jet port communicating with the cavity. An argon gas cylinder is installed on the top of the mounting block. The air outlet end of the argon gas cylinder is connected to the air jet port through a first corrugated pipe. A first electronic valve is arranged in the air jet port. A second mounting plate is installed on the top of the first mounting plate. A second motor is installed on the side of the second mounting plate. The output shaft of the second motor is connected to a mounting shaft. A plurality of fan blades are installed on the outer wall of the mounting shaft. The fan blades are located between a plurality of air jet ports. An air outlet hole communicating with the sealing shell is formed on the top of the outer wall of the sealing shell. A second electronic valve is arranged in the air outlet hole.

[0010] Preferably, a connecting plate is installed on the side of the first mounting plate away from the second mounting plate. An L-shaped guide plate is installed on the side of the connecting plate. A plurality of guide channels are formed on the side of the L-shaped guide plate close to the fan blades. The alumina grinding wheel is located between the fan blades and the L-shaped guide plate.

[0011] Preferably, a dust suction port is formed on the side of the sealing shell. A dust collector is installed on the top of the mounting block. The dust suction end of the dust collector is connected to the dust suction port through a second corrugated pipe.

[0012] Preferably, a first guide rail is installed on the side of the strip plate. A first electric slider is slidably installed on the first guide rail. The sealing shell is installed on the side of the first electric slider.

[0013] Preferably, the sealing shell is provided with an opening, the titanium alloy tube is located within the opening, a support plate is mounted on the top of the bottom plate, a limiting strip is mounted on the top of the support plate, a limiting groove is provided on the top of the limiting strip, the bottom end of the tube plate is located within the limiting groove, the tube plate is located between two sealing shells, a cross plate is mounted on the side of the sealing shell close to the strip plate, a second guide rail is mounted on the bottom of the cross plate, a second electric slider is slidably mounted on the second guide rail, a limiting block is mounted on the bottom of the second electric slider, and the limiting block is concentric with the opening.

[0014] Preferably, an annular groove is provided on the side of the sealing shell close to the tube plate, a rubber ring is mounted within the annular groove, a mounting ring is mounted on the inner wall of the sealing shell, an annular groove is provided on the side of the mounting ring close to the third guide rail, a water-absorbing sponge is mounted within the annular groove, acetone is adsorbed within the water-absorbing sponge, and the alumina grinding wheel is located between the mounting ring and the rectangular plate.

[0015] Preferably, the limiting mechanism includes a first fixing plate and a second fixing plate symmetrically mounted on the top of the bottom plate, a positive and negative thread bidirectional lead screw is rotatably mounted between the first fixing plate and the second fixing plate, a first motor is mounted on the side of the first fixing plate away from the positive and negative thread bidirectional lead screw, an output shaft of the first motor is connected to the positive and negative thread bidirectional lead screw, a bearing is mounted on the side of the second fixing plate close to the positive and negative thread bidirectional lead screw, an end of the positive and negative thread bidirectional lead screw is mounted within an inner ring of the bearing, a sliding rod is mounted between the first fixing plate and the second fixing plate, sliding sleeves are mounted on the bottoms of two internal thread blocks, and the sliding sleeves are slidably sleeved on the sliding rod.

[0016] Preferably, a loading rack and a collection box are mounted on the top of the bottom plate, the loading rack is used for supporting the titanium alloy tube, the tube plate is located between the loading rack and the collection box, and the bottom plate is provided with a mounting hole.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1: In the present invention, argon gas is filled within the sealing shell to wrap the weld seam, thereby providing protection during argon arc welding of the weld seam, avoiding the phenomenon that the weld seam absorbs hydrogen when heated and is prone to brittle cracking in the later stage. By using two sealing shells to completely seal the weld seam between the tube plate and the titanium alloy tube, it is possible to prevent hydrogen in the external air from being absorbed by the weld seam during welding, isolate the hydrogen in the external air from the weld seam, avoid the phenomenon that the weld seam absorbs hydrogen when heated, and by using two sealing shells to seal the weld seam and using argon gas to wrap the weld seam, the weld seam is completely surrounded by argon gas, providing protection for the weld seam with argon gas and improving the welding quality during argon arc welding of the weld seam.

[0019] 2: In the present invention, two sealed shells are used to completely seal the weld seam. At the same time, the parts of the tube sheet and the titanium alloy tube that are heated by welding are also sealed within the two sealed shells. This allows the parts of the titanium alloy tube that are heated by welding during welding to be within the sealed shells and protected by the argon gas inside the sealed shells, avoiding hydrogen absorption and brittle cracking at the parts of the titanium alloy tube that are heated during welding, and improving the comprehensiveness of the protection for the weld seam welding.

[0020] 3: In the present invention, the fan blade blows the argon gas towards the L-shaped guide plate. The guide flow channel on the side of the L-shaped guide plate can then guide the argon gas. Thus, the argon gas fanned by the fan blade is guided to the position where the argon arc welding gun head is welding through the L-shaped guide plate and the guide flow channel, thereby guiding the argon gas so that the guided argon gas blows argon on the part where the argon arc welding gun head is welding. While fully ensuring that the weld seam is fully protected by argon gas during the welding of the argon arc welding gun head, the argon gas flow formed by the fanned argon gas blows and cools the welding area, avoiding overheating of the weld seam welding area and causing grain growth in the welding zone, which affects the welding quality.

[0021] 4: In the present invention, the alumina grinding wheel performs a circular grinding treatment on the weld seam, which can grind and remove the oxide scale on the surface of the weld seam, ensuring the cleanliness before welding of the weld seam, improving the later welding effect. The alumina grinding wheel comes into contact with the water-absorbing sponge, and thus the alumina grinding wheel dips into the acetone inside the water-absorbing sponge. By repeating the grinding step of the alumina grinding wheel, the acetone dipped by the alumina grinding wheel can be smeared on the weld seam when it rubs against the weld seam. Then, the acetone is used to clean the oil stain on the weld seam, ensuring the cleanliness before welding of the weld seam. Just after the oxide scale on the weld seam is ground off by the alumina grinding wheel and the oil stain on the weld seam is removed by smearing acetone, after the weld seam is cleaned, welding treatment can be carried out on the weld seam in a timely manner. This can complete the welding of the weld seam in a fully clean state, thereby ensuring that the weld seam is in a clean state during welding and improving the welding quality of the weld seam. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural view of a welding device for titanium heat exchanger processing proposed by the present invention from the first perspective;

[0023] Figure 2 is a schematic structural view of a welding device for titanium heat exchanger processing proposed by the present invention from the second perspective;

[0024] Figure 3 is a schematic connection view of the first fixing plate and the first motor of a welding device for titanium heat exchanger processing proposed by the present invention;

[0025] Figure 4 is a schematic connection view of the sliding sleeve and the sliding rod of a welding device for titanium heat exchanger processing proposed by the present invention;

[0026] Figure 5Schematic diagram of the connection between the mounting block and the fixing frame of a welding device for titanium heat exchanger processing proposed by the present invention;

[0027] Figure 6 Schematic diagram of the connection between the fixing frame and the strip plate of a welding device for titanium heat exchanger processing proposed by the present invention;

[0028] Figure 7 Schematic diagram of the connection between the mounting block and the argon gas cylinder of a welding device for titanium heat exchanger processing proposed by the present invention;

[0029] Figure 8 Schematic diagram of the connection between the third guide rail and the third electric slider of a welding device for titanium heat exchanger processing proposed by the present invention;

[0030] Figure 9 Schematic diagram of the connection between the rectangular plate and the fourth guide rail of a welding device for titanium heat exchanger processing proposed by the present invention;

[0031] Figure 10 Schematic diagram of the connection between the fourth electric slider and the first mounting plate of a welding device for titanium heat exchanger processing proposed by the present invention;

[0032] Figure 11 Schematic diagram of the connection between the mounting ring and the water-absorbing sponge of a welding device for titanium heat exchanger processing proposed by the present invention.

[0033] In the figure: 1, bottom plate; 2, mounting hole; 3, first fixing plate; 4, second fixing plate; 5, first motor; 6, positive and negative thread bidirectional lead screw; 7, bearing; 8, internal thread block; 9, sliding sleeve; 10, sliding rod; 11, loading rack; 12, collection box; 13, support plate; 14, limiting strip; 15, tube sheet; 16, titanium alloy tube; 17, first electric telescopic rod; 18, mounting block; 19, fixing frame; 20, strip plate; 21, argon gas cylinder; 22, first bellows; 23, jet orifice; 24, vacuum cleaner; 25, second bellows; 26, sealing shell; 27, air outlet hole; 28, dust suction port; 29, first guide rail; 30, first electric slider; 31, cross plate; 32, second guide rail; 33, second electric slider; 34, limiting block; 35, rubber ring; 36, opening; 37, third guide rail; 38, third electric slider; 39, rectangular plate; 40, fourth guide rail; 41, fourth electric slider; 42, first mounting plate; 43, second mounting plate; 44, second motor; 45, fan blade; 46, third mounting plate; 47, third motor; 48, fourth mounting plate; 49, second electric telescopic rod; 50, alumina grinding wheel; 51, third electric telescopic rod; 52, argon arc welding gun head; 53, connecting plate; 54, L-shaped guide plate; 55, guiding flow channel; 56, mounting ring; 57, water-absorbing sponge; 58, air jet hole. Detailed implementation mode

[0034] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0035] Refer to Figures 1-11 , a welding device for titanium heat exchanger processing, including a bottom plate 1, a tube sheet 15 and a titanium alloy tube 16. A positive and negative thread bidirectional lead screw 6 is rotatably installed on the bottom plate 1. Inner thread blocks 8 are sleeved on the two threaded rods of the positive and negative thread bidirectional lead screw 6 with opposite thread rotation directions. A limiting mechanism for limiting the inner thread block 8 is arranged on the bottom plate 1. Sealing mechanisms for sealing the welding joints of the tube sheet 15 and the titanium alloy tube 16 are arranged on both inner thread blocks 8;

[0036] The sealing mechanism includes a first electric telescopic rod 17 installed on the top of the inner thread block 8. The end of the piston rod of the first electric telescopic rod 17 is connected to a mounting block 18. The top of the mounting block 18 is connected to a fixing frame 19. A strip plate 20 is installed at the end of the fixing frame 19. A sealing shell 26 is slidably installed on the side of the strip plate 20. A welding assembly is rotatably arranged in the sealing shell 26.

[0037] As a technical optimization scheme of the present invention, the welding assembly includes an annular third guide rail 37 installed on the inner bottom wall of the sealing shell 26. A third electric slider 38 is slidably installed on the third guide rail 37. A rectangular plate 39 is installed on the side of the third electric slider 38. A fourth guide rail 40 is installed on the side of the rectangular plate 39. A fourth electric slider 41 is slidably installed on the fourth guide rail 40. A first mounting plate 42 is installed on the side of the fourth electric slider 41. A third mounting plate 46 is installed on the side of the first mounting plate 42. A third motor 47 is installed on the side of the third mounting plate 46. The output shaft of the third motor 47 is connected to a fourth mounting plate 48. A second electric telescopic rod 49 and a third electric telescopic rod 51 are installed on the side of the fourth mounting plate 48. The end of the piston rod of the second electric telescopic rod 49 is installed with a triangular alumina grinding wheel 50. The weld between the tube sheet 15 and the titanium alloy tube 16 can be in contact with the end of the triangular alumina grinding wheel 50. The end of the piston rod of the third electric telescopic rod 51 is installed with a tungsten inert gas welding gun head 52.

[0038] As a technical optimization solution of the present invention, an annular cavity is provided inside the sealing shell 26. A plurality of air jet holes 58 communicating with the cavity are provided on the inner ring wall of the sealing shell 26. A jet port 23 communicating with the cavity is provided at the bottom of the outer wall of the sealing shell 26. An argon gas cylinder 21 is installed on the top of the mounting block 18. The gas outlet end of the argon gas cylinder 21 is connected to the jet port 23 through a first corrugated pipe 22. A first electronic valve is provided in the jet port 23. A second mounting plate 43 is installed on the top of the first mounting plate 42. A second motor 44 is installed on the side of the second mounting plate 43. The output shaft of the second motor 44 is connected to a mounting shaft. A plurality of fan blades 45 are installed on the outer wall of the mounting shaft. The fan blades 45 are located between a plurality of jet ports 23. An air outlet hole 27 communicating with the sealing shell 26 is provided at the top of the outer wall of the sealing shell 26. A second electronic valve is provided in the air outlet hole 27. The mounting shaft can provide an installation position for the fan blades 45, facilitating the rotation of the mounting shaft driven by the output shaft of the second motor 44, and further causing the fan blades 45 to rotate.

[0039] As a technical optimization solution of the present invention, a connecting plate 53 is installed on the side of the first mounting plate 42 away from the second mounting plate 43. An L-shaped guide plate 54 is installed on the side of the connecting plate 53. A plurality of guide channels 55 are provided on the side of the L-shaped guide plate 54 close to the fan blades 45. The alumina grinding wheel 50 is located between the fan blades 45 and the L-shaped guide plate 54.

[0040] As a technical optimization solution of the present invention, a dust suction port 28 is provided on the side of the sealing shell 26. A dust collector 24 is installed on the top of the mounting block 18. The dust suction end of the dust collector 24 is connected to the dust suction port 28 through a second corrugated pipe 25. By the combined use of the dust collector 24, the second corrugated pipe 25 and the dust suction port 28, it is convenient to collect and process the waste chips ground off by the alumina grinding wheel 50.

[0041] As a technical optimization solution of the present invention, a first guide rail 29 is installed on the side of the strip plate 20. A first electric slider 30 is slidably installed on the first guide rail 29. The sealing shell 26 is installed on the side of the first electric slider 30.

[0042] As a technical optimization solution of the present invention, the sealing shell 26 is provided with an opening 36. The titanium alloy pipe 16 is located in the opening 36. A support plate 13 is installed on the top of the bottom plate 1. A limiting strip 14 is installed on the top of the support plate 13. A limiting groove is provided on the top of the limiting strip 14. The bottom end of the tube plate 15 is located in the limiting groove. The tube plate 15 is located between two sealing shells 26. A cross plate 31 is installed on the side of the sealing shell 26 close to the strip plate 20. A second guide rail 32 is installed on the bottom of the cross plate 31. A second electric slider 33 is slidably installed on the second guide rail 32. A limiting block 34 is installed on the bottom of the second electric slider 33. The limiting block 34 is concentric with the opening 36. The limiting groove on the top of the limiting strip 14 can facilitate the limitation of the tube plate 15.

[0043] As a technical optimization solution of the present invention, an annular groove is provided on one side of the sealing shell 26 close to the tube sheet 15. A rubber ring 35 is installed in the annular groove. An installation ring 56 is installed on the inner wall of the sealing shell 26. An annular groove is provided on one side of the installation ring 56 close to the third guide rail 37. A water-absorbing sponge 57 is installed in the annular groove. Acetone is adsorbed in the water-absorbing sponge 57. The alumina grinding wheel 50 is located between the installation ring 56 and the rectangular plate 39. The annular groove can facilitate the connection between the water-absorbing sponge 57 and the installation ring 56.

[0044] As a technical optimization solution of the present invention, the limiting mechanism includes a first fixing plate 3 and a second fixing plate 4 symmetrically installed on the top of the bottom plate 1. A left-right hand double-threaded lead screw 6 is rotatably installed between the first fixing plate 3 and the second fixing plate 4. A first motor 5 is installed on one side of the first fixing plate 3 away from the left-right hand double-threaded lead screw 6. The output shaft of the first motor 5 is connected to the left-right hand double-threaded lead screw 6. A bearing 7 is installed on one side of the second fixing plate 4 close to the left-right hand double-threaded lead screw 6. The end of the left-right hand double-threaded lead screw 6 is installed in the inner ring of the bearing 7. A slide bar 10 is installed between the first fixing plate 3 and the second fixing plate 4. Slide sleeves 9 are installed at the bottoms of both internal thread blocks 8. The slide sleeves 9 are slidably sleeved on the slide bar 10.

[0045] As a technical optimization solution of the present invention, a loading rack 11 and a collection box 12 are installed on the top of the bottom plate 1. The loading rack 11 is used to support the titanium alloy tube 16. The tube sheet 15 is located between the loading rack 11 and the collection box 12. Installation holes 2 are provided on the bottom plate 1. The collection box 12 can facilitate the collection of the welded tube sheet 15 and titanium alloy tube 16.

[0046] When the present invention is in use and it is necessary to weld the titanium alloy tube 16 to the tube sheet 15, first, the conveyor belt of the peripheral device is used to convey the tube sheet 15 to the middle position between the two sealing shells 26. The first motor 5 is started, and the output shaft of the first motor 5 drives the left - and - right - hand threaded bidirectional lead screw 6 to rotate, causing the two internal - threaded blocks 8 to move closer to each other. The two internal - threaded blocks 8 moving closer to each other drive the two fixing frames 19 to move closer to each other, and further cause the two sealing shells 26 to move closer to each other to clamp the tube sheet 15. The two sealing shells 26 moving closer to each other can be used to clamp and fix the titanium alloy tube 16 conveyed to the middle of the two sealing shells 26. After the titanium alloy tube 16 is clamped and fixed by the two sealing shells 26, the two first electric sliders 30 are started simultaneously. The first electric sliders 30 slide on the first guide rail 29 to adjust the position of the sealing shells 26, and further adjust the position of the tube sheet 15 clamped and fixed by the two sealing shells 26. The tube sheet 15 can be adjusted to be directly above the limiting strip 14. At this time, the two first electric telescopic rods 17 are started simultaneously. The piston rods of the two first electric telescopic rods 17 retract to drive the two sealing shells 26 to move downward, and further drive the tube sheet 15 clamped and fixed by the two sealing shells 26 to move downward. The tube sheet 15 can be moved downward into the limiting groove opened at the top of the limiting strip 14, thereby completing the automatic feeding process of the tube sheet 15.

[0047] After automatically feeding the tube sheet 15 into the limit groove opened at the top of the limit bar 14, start the first motor 5 again to make the two sealing shells 26 move away from each other until the distance between the two sealing shells 26 is greater than the length of the titanium alloy tube 16 and then stop. At this time, start one of the first electric sliders 30 to slide on the first guide rail 29, and one of the sealing shells 26 can be adjusted to the side of the titanium alloy tube 16 and stop when the opening 36 of one of the sealing shells 26 is concentric with the titanium alloy tube 16. At this time, start the first motor 5 again to make the two sealing shells 26 move closer to each other again, and one of the sealing shells 26 that is concentric with the titanium alloy tube 16 moves closer to the titanium alloy tube 16 until the titanium alloy tube 16 is inserted into the opening 36 of the sealing shell 26. At this time, start the first electric telescopic rod 17 connected to the sealing shell 26 to make the sealing shell 26 move upward, and then make the sealing shell 26 drive the titanium alloy tube 16 to move upward, lift the titanium alloy tube 16 from the loading rack 11 so that the titanium alloy tube 16 is separated from the loading rack 11, and use the cooperation of the first electric slider 30, the first guide rail 29 and the first electric telescopic rod 17 to adjust the sealing shell 26 connected with the titanium alloy tube 16 to the position where the titanium alloy tube 16 is concentric with the through hole of the tube sheet 15. At this time, start the first motor 5 to make the two sealing shells 26 move closer to each other, and then make the sealing shell 26 connected with the titanium alloy tube 16 move closer to the tube sheet 15 to insert the titanium alloy tube 16 into the through hole of the tube sheet 15, and make the titanium alloy tube 16 pass through the through hole of the tube sheet 15 and enter the opening 36 of the other sealing shell 26. And at this time, start the two second electric sliders 33 at the same time. The second electric sliders 33 slide on the second guide rail 32 to make the limit blocks 34 move closer to the tube sheet 15, and then use the limit blocks 34 to push the titanium alloy tube 16 so that the titanium alloy tube 16 is located between the two limit blocks 34, thus completing the removal of the titanium alloy tube 16 from the loading rack 11 and inserting the titanium alloy tube 16 into the through hole of the tube sheet 15.

[0048] After connecting the titanium alloy tube 16 and the tube sheet 15, start the first motor 5 to make the two sealing shells 26 move closer to each other until the two sealing shells 26 contact the side of the tube sheet 15, and then make the weld between the tube sheet 15 and the titanium alloy tube 16 be located between the two sealing shells 26, and use the two sealing shells 26 to seal the weld between the tube sheet 15 and the titanium alloy tube 16.

[0049] At this time, the third motor 47 is started, and the output shaft of the third motor 47 drives the fourth mounting plate 48 to rotate, thereby adjusting the angles of the second electric telescopic rod 49 and the alumina grinding wheel 50, so that the angle of the alumina grinding wheel 50 can be adapted to the weld angle between the tube sheet 15 and the titanium alloy tube 16. At this time, starting the second electric telescopic rod 49 can make the alumina grinding wheel 50 approach the weld between the tube sheet 15 and the titanium alloy tube 16 until the alumina grinding wheel 50 contacts the weld. At this time, the third electric slider 38 and the vacuum cleaner 24 are started simultaneously. The third electric slider 38 slides on the third guide rail 37 and makes a circumferential movement around the opening 36, thereby driving the alumina grinding wheel 50 to perform a circular grinding process on the weld, and the scale on the weld surface can be ground off to ensure the cleanliness before welding and improve the later welding effect. At the same time, the suction end of the vacuum cleaner 24 adsorbs and collects the waste chips ground off by the alumina grinding wheel 50 through the second corrugated pipe 25 and the suction port 28, and the waste chips generated by the alumina grinding wheel 50 grinding the weld can be uniformly collected into the vacuum cleaner 24.

[0050] And while the alumina grinding wheel 50 is grinding the weld, the second motor 44 can be started. The output shaft of the second motor 44 drives the fan blade 45 to rotate. The wind blown by the fan blade 45 is guided by the guide flow channel 55 on the L-shaped guide plate 54 to the contact part between the alumina grinding wheel 50 and the weld, thereby blowing the waste chips generated when the alumina grinding wheel 50 grinds the weld, and the waste chips generated when the alumina grinding wheel 50 grinds the weld can be blown up, which is convenient for the suction port 28 to adsorb and collect the waste chips.

[0051] After the scale on the weld surface is ground off, by using the third motor 47 and the second electric telescopic rod 49 in cooperation again, the alumina grinding wheel 50 can be made to contact the water-absorbing sponge 57, so that the alumina grinding wheel 50 dips into the acetone in the water-absorbing sponge 57, and by repeating the grinding steps of the alumina grinding wheel 50, the acetone dipped by the alumina grinding wheel 50 can be rubbed with the weld and applied to the weld, thereby using acetone to clean the oil stain at the weld and ensuring the cleanliness before welding.

[0052] At this time, the first electronic valve in the jet nozzle 23 and the second electronic valve in the air outlet hole 27 are started. The argon gas in the argon gas cylinder 21 passes through the first corrugated pipe 22, the jet nozzle 23 and the jet hole 58 and enters the sealing shell 26. And based on the principle that the density of argon gas is greater than that of hydrogen gas, when argon gas is introduced into the sealing shell 26, the density of the argon gas introduced into the sealing shell 26 is greater than that of hydrogen gas. The argon gas in the sealing shell 26 is at the bottom of the sealing shell 26, and then the hydrogen gas in the sealing shell 26 is squeezed out through the air outlet hole 27. Thus, the sealing shell 26 is filled with argon gas. And when the sealing shell 26 is filled with argon gas, the second electronic valve in the air outlet hole 27 is closed, which can make the sealing shell 26 filled with argon gas. Using the argon gas filled in the sealing shell 26 to wrap the weld seam, and then providing protection during the argon arc welding of the weld seam, avoiding the weld seam from absorbing hydrogen when heated and being prone to brittle cracking in the later stage. Using two sealing shells 26 to completely seal the weld seam between the tube sheet 15 and the titanium alloy tube 16 can prevent the hydrogen in the outside air from being absorbed by the weld seam during welding, can isolate the hydrogen in the outside air from the weld seam, avoid the weld seam from absorbing hydrogen when heated during welding, and using two sealing shells 26 to seal the weld seam and using argon gas to wrap the weld seam make the weld seam completely surrounded by argon gas, providing protection for the weld seam with argon gas, improving the welding quality during the argon arc welding of the weld seam, and using two sealing shells 26 to seal the weld seam can also prevent the weld seam from being affected by external factors during welding and affecting the welding effect.

[0053] And using two sealing shells 26 to completely seal the weld seam, and at the same time sealing the parts of the tube sheet 15 and the titanium alloy tube 16 that are heated due to welding in the two sealing shells 26 can make the parts of the titanium alloy tube 16 that are heated due to welding during welding also be in the sealing shell 26 and be protected by the argon gas in the sealing shell 26, avoiding brittle cracking caused by the parts of the titanium alloy tube 16 being heated during welding and absorbing hydrogen, and improving the comprehensiveness of the protection for the weld seam welding.

[0054] After the weld seam is cleaned, start the third motor 47 to rotate the argon arc welding gun head 52 to an angle adapted to the weld seam, start the third electric telescopic rod 51, and then make the argon arc welding gun head 52 move closer to the weld seam until it stops when the argon arc welding gun head 52 reaches the preset distance from the weld seam. At this time, start the third electric slider 38. The third electric slider 38 slides on the third guide rail 37 to make the argon arc welding gun head 52 perform circumferential welding around the weld seam. Thus, the weld seam can be welded in one go. During the welding process of the weld seam, there is no need to pause to complete the welding treatment of the weld seam, and the weld seam is welded in one go, improving the welding quality of the weld seam.

[0055] When welding the weld seam, the second motor 44 is started. The output shaft of the second motor 44 drives the fan blade 45 to rotate, which fans the argon gas ejected from the air injection hole 58. The fan blade 45 fans the argon gas towards the L-shaped guide plate 54, and the guide flow channel 55 on the side of the L-shaped guide plate 54 can guide the argon gas. Then, the L-shaped guide plate 54 and the guide flow channel 55 are used to guide the argon gas fanned by the fan blade 45 to the position where the argon arc welding gun head 52 is welding. Further guiding the argon gas, so that the guided argon gas blows argon gas on the part where the argon arc welding gun head 52 is welding. While fully ensuring that the weld seam during the welding of the argon arc welding gun head 52 is fully protected by argon gas, the argon gas flow formed by the fanned argon gas is used to blow and cool the welding area, avoiding overheating of the weld seam welding area and affecting the welding quality due to grain growth in the welding area.

[0056] Moreover, the rotation of the fan blade 45 can fan the argon gas in the sealed shell 26, making the argon gas evenly distributed in the sealed shell 26, so that all angles in the sealed shell 26 are filled with argon gas. The rotating fan blade 45 can be used to fan the argon gas to achieve the stirring effect of the argon gas, making the argon gas evenly distributed in the sealed shell 26 and ensuring that all angles in the sealed shell 26 are filled with argon gas.

[0057] When using the argon arc welding gun head 52 to weld the weld seam, the oxidation scale of the weld seam is just removed by the alumina grinding wheel 50, and acetone is applied to remove the oil stain at the weld seam. After the weld seam is cleaned, the welding treatment of the weld seam can be carried out in time. It can complete the welding of the weld seam in a fully clean state, thereby ensuring that the weld seam is in a clean state during welding, improving the welding quality of the weld seam. At the same time, using two sealed shells 26 to seal the whole welding process can make the weld seam complete welding under the full protection of argon gas, and using the sealing of the weld seam can also prevent external dust and impurities from falling and adhering to the just-welded weld seam, affecting the welding quality.

[0058] When welding the weld seam, two sealed shells 26 are used to seal the weld seam. The two sealed shells 26 can be used to support the titanium alloy tube 16, so that the titanium alloy tube 16 is in a horizontal state when welding with the tube plate 15, ensuring that the titanium alloy tube 16 and the tube plate 15 are perpendicular to each other when welding, avoiding the skew welding of the titanium alloy tube 16 and the tube plate 15, improving the welding accuracy between the titanium alloy tube 16 and the tube plate 15. And using two limit blocks 34 to clamp and fix both ends of the titanium alloy tube 16 can make the titanium alloy tube 16 be fixed between the two limit blocks 34 during welding. The limit groove at the top of the limit strip 14 fixes the tube plate 15, so that both the titanium alloy tube 16 and the tube plate 15 are fixed during welding, improving the stability during the welding of the titanium alloy tube 16 and the tube plate 15.

[0059] After the tube sheet 15 and the titanium alloy tube 16 are welded, start the first motor 5 again to make the two sealing shells 26 disengage from the tube sheet 15, and use the first electric slider 30 to slide on the first guide rail 29 so that the two sealing shells 26 are located between the limiting strip 14 and the loading rack 11. At this time, start the first motor 5 again to make the two sealing shells 26 contact each other, and then make the first electric slider 30 slide on the first guide rail 29 again, so that the two mutually contacting sealing shells 26 can push the welded tube sheet 15 and titanium alloy tube 16, and then push the welded tube sheet 15 and titanium alloy tube 16 from the limiting groove into the collection box 12 to complete the unloading process of the welded tube sheet 15 and titanium alloy tube 16.

[0060] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A welding device for titanium heat exchanger processing, comprising a base plate (1), a tube sheet (15) and a titanium alloy tube (16), characterized in that: A forward and reverse bidirectional screw rod (6) is rotatably mounted on the base plate (1); two sections of the forward and reverse bidirectional screw rod (6) with threads in opposite directions are sleeved with internal thread blocks (8); a limiting mechanism for limiting the position of the internal thread blocks (8) is provided on the base plate (1); and a sealing mechanism for sealing the welding point between the tube sheet (15) and the titanium alloy tube (16) is provided on the two internal thread blocks (8); The sealing mechanism comprises a first electric telescopic rod (17) mounted on the top of the internal thread block (8); the piston rod end of the first electric telescopic rod (17) is connected to a mounting block (18); the top of the mounting block (18) is connected to a fixing frame (19); a strip plate (20) is mounted on the end of the fixing frame (19); a sealing shell (26) is slidably mounted on the side of the strip plate (20); and a welding assembly is rotatably arranged in the sealing shell (26); An annular cavity is provided inside the sealing shell (26); a plurality of gas injection holes (58) communicating with the cavity are provided on the inner ring wall of the sealing shell (26); a gas injection port (23) communicating with the cavity is provided at the bottom of the outer wall of the sealing shell (26); an argon gas bottle (21) is installed on the top of the mounting block (18); a gas outlet end of the argon gas bottle (21) is connected to the gas injection port (23) via a first bellows (22); and a first electronic valve is provided in the gas injection port (23); The welding assembly comprises an annular third guide rail (37) mounted on the inner bottom wall of the sealing shell (26); a third electric slider (38) is slidably mounted on the third guide rail (37); a rectangular plate (39) is mounted on the side of the third electric slider (38); a fourth guide rail (40) is mounted on the side of the rectangular plate (39); a fourth electric slider (41) is slidably mounted on the fourth guide rail (40); a first mounting plate (42) is mounted on the side of the fourth electric slider (41); a third mounting plate (46) is mounted on the side of the first mounting plate (42); and the third mounting plate (46) is mounted on the side of the third mounting plate (46). 6) A third motor (47) is mounted on the side, the output shaft of the third motor (47) is connected to a fourth mounting plate (48), a second electric telescopic rod (49) and a third electric telescopic rod (51) are mounted on the side of the fourth mounting plate (48), a triangular alumina grinding wheel (50) is mounted on the end of the piston rod of the second electric telescopic rod (49), the weld between the tube plate (15) and the titanium alloy tube (16) is capable of contacting the end of the triangular alumina grinding wheel (50), and a argon arc welding gun head (52) is mounted on the end of the piston rod of the third electric telescopic rod (51); The sealing shell (26) is provided with an opening (36), the titanium alloy tube (16) is located in the opening (36), a support plate (13) is installed on the top of the bottom plate (1), a limit strip (14) is installed on the top of the support plate (13), a limit groove is provided on the top of the limit strip (14), the bottom end of the tube plate (15) is located in the limit groove, the tube plate (15) is located between the two sealing shells (26), a transverse plate (31) is installed on one side of the sealing shell (26) close to the strip plate (20), a second guide rail (32) is installed at the bottom of the transverse plate (31), a second electric slider (33) is slidably installed on the second guide rail (32), a limit block (34) is installed at the bottom of the second electric slider (33), and the limit block (34) is cocentric with the opening (36).

2. The welding equipment for titanium heat exchanger processing according to claim 1 is characterized in that: A second mounting plate (43) is mounted on the top of the first mounting plate (42), a second motor (44) is mounted on the side of the second mounting plate (43), an output shaft of the second motor (44) is connected to a mounting shaft, a plurality of fan blades (45) are mounted on the outer wall of the mounting shaft, the fan blades (45) are located between the plurality of air jets (23), an air outlet (27) connected to the sealing shell (26) is provided at the top of the outer wall of the sealing shell (26), and a second electronic valve is arranged in the air outlet (27).

3. The welding equipment for titanium heat exchanger processing according to claim 2 is characterized in that: A connecting plate (53) is installed on a side of the first mounting plate (42) away from the second mounting plate (43); an L-shaped guide plate (54) is installed on a side of the connecting plate (53); a plurality of guide flow channels (55) are provided on a side of the L-shaped guide plate (54) close to the fan blade (45); and the alumina grinding wheel (50) is located between the fan blade (45) and the L-shaped guide plate (54).

4. The welding equipment for titanium heat exchanger processing according to claim 1 is characterized in that: A dust suction port (28) is provided on the side of the sealing shell (26), a dust collector (24) is installed on the top of the mounting block (18), and a dust suction end of the dust collector (24) is connected to the dust suction port (28) via a second corrugated pipe (25).

5. The welding equipment for titanium heat exchanger processing according to claim 1 is characterized in that: A first guide rail (29) is installed on the side of the strip plate (20), a first electric slider (30) is slidably installed on the first guide rail (29), and a sealing shell (26) is installed on the side of the first electric slider (30).

6. The welding equipment for titanium heat exchanger processing according to claim 1, characterized in that: The sealing shell (26) is provided with an annular groove on one side close to the tube sheet (15), a rubber ring (35) is installed in the annular groove, a mounting ring (56) is installed on the inner wall of the sealing shell (26), an annular groove is provided on one side close to the third guide rail (37), a water-absorbing sponge (57) is installed in the annular groove, acetone is absorbed in the water-absorbing sponge (57), and an alumina grinding wheel (50) is located between the mounting ring (56) and the rectangular plate (39).

7. The welding equipment for titanium heat exchanger processing according to claim 1 is characterized in that: The limiting mechanism comprises a first fixing plate (3) and a second fixing plate (4) symmetrically mounted on the top of the base plate (1); a forward and reverse bidirectional screw rod (6) is rotatably mounted between the first fixing plate (3) and the second fixing plate (4); a first motor (5) is mounted on a side of the first fixing plate (3) away from the forward and reverse bidirectional screw rod (6); an output shaft of the first motor (5) is connected to the forward and reverse bidirectional screw rod (6); a bearing (7) is mounted on a side of the second fixing plate (4) close to the forward and reverse bidirectional screw rod (6); an end of the forward and reverse bidirectional screw rod (6) is mounted on an inner ring of the bearing (7); a sliding rod (10) is mounted between the first fixing plate (3) and the second fixing plate (4); a sliding sleeve (9) is mounted at the bottom of each of the two internal thread blocks (8); and the sliding sleeve (9) is slidably sleeved on the sliding rod (10).

8. The welding equipment for titanium heat exchanger processing according to claim 1, characterized in that: A loading rack (11) and a collecting box (12) are installed on the top of the bottom plate (1); the loading rack (11) is used to support the titanium alloy tube (16); the tube sheet (15) is located between the loading rack (11) and the collecting box (12); and a mounting hole (2) is provided on the bottom plate (1).

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