Welding equipment for titanium heat exchanger machining

Abstract

The invention relates to the technical field of welding equipment, in particular to welding equipment for titanium heat exchanger machining, which comprises a bottom plate, a tube plate and a titanium alloy tube, a positive and negative tooth bidirectional screw rod is rotatably mounted on the bottom plate, and two sections of threaded rods with opposite thread directions of the positive and negative tooth bidirectional screw rod are sleeved with internal threaded blocks; and a limiting mechanism for limiting the internal thread block is arranged on the bottom plate. The sealing shells are filled with argon to wrap the welding seam, then protection is provided when argon arc welding is conducted on the welding seam, the phenomenon that the welding seam is prone to embrittlement in the later period due to the fact that the welding seam absorbs hydrogen after being heated is avoided, and the welding seam of the tube plate and the titanium alloy tube is completely sealed through the two sealing shells; hydrogen in external air can be prevented from being absorbed when being welded by a welding seam, the hydrogen in the external air can be isolated from the welding seam, and the phenomenon that the welding seam is heated to absorb hydrogen when being welded is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of welding equipment, and in particular to welding equipment used for machining titanium heat exchangers. Background Art

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

[0003] After searching, it was found that the Chinese patent with application number 201610396529.9 disclosed "an electron beam welding method for tubes and tube sheets in titanium alloy heat exchangers, wherein the tubes and tube sheets assembled with tooling are fixed on a rotating table of an electron beam welding machine, the rotating table is located on an XY worktable, the XY worktable 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, the XY worktable is moved so that the center of the electron gun is located at the position (x1+R+L, y1), then, the electron gun is adjusted so that its beam spot moves to (x1+R, y1), then, while the rotating table rotates at a uniform speed, the XY worktable is adjusted. The rotating table moves along the X track and the Y track to keep the center of the tube to be welded at the position (x1, y1) and rotate at a constant speed, and the connection between the tube to be welded and the tube sheet rotated to the position (x1+R, y1) is welded by an electron gun with a fixed emission position and direction". However, in the above-mentioned electron beam welding method of the tube and the tube sheet in the titanium alloy heat exchanger, when welding the weld between the tube sheet and the titanium alloy tube, the weld between the tube sheet and the titanium alloy tube is exposed to the outside world, and when welding the weld between the tube sheet and the titanium alloy tube, the titanium alloy tube will absorb hydrogen when the temperature rises, which makes the titanium alloy tube prone to brittle cracking. Therefore, in order to solve such problems, a welding device for titanium heat exchanger processing is proposed. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a welding device for titanium heat exchanger processing.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A welding device for titanium heat exchanger processing, comprising a bottom plate, a tube plate and a titanium alloy tube, wherein a forward and reverse bidirectional screw rod is rotatably mounted on the bottom plate, and internal thread blocks are sleeved on two sections of the thread rod with opposite thread rotation directions of the forward and reverse bidirectional screw rod, a limiting mechanism for limiting the internal thread blocks is arranged on the bottom plate, and a sealing mechanism for sealing the welding point between the tube plate and the titanium alloy tube is arranged on the two internal thread blocks; The sealing mechanism includes a first electric telescopic rod installed on the top of the internal thread block, the piston rod end of the first electric telescopic rod is connected to the mounting block, the top of the mounting block is connected to a fixing frame, a strip plate is installed at the end of the fixing frame, a sealing shell is slidably installed on the side of the strip plate, and a welding assembly is rotatably arranged in the sealing shell.

[0006] 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 the fourth mounting plate, a second electric telescopic rod and a third electric telescopic rod are installed on the side of the fourth mounting plate, a triangular alumina grinding wheel is installed at the end of the piston rod of the second electric telescopic rod, the weld between the tube plate and the titanium alloy tube can contact the end of the triangular alumina grinding wheel, and an argon arc welding gun head is installed at the end of the piston rod of the third electric telescopic rod.

[0007] Preferably, an annular cavity is provided inside the sealing shell, a plurality of jet holes connected to the cavity are provided on the inner ring wall of the sealing shell, a jet port connected to the cavity is provided at the bottom of the outer wall of the sealing shell, an argon gas bottle is installed on the top of the mounting block, the gas outlet end of the argon gas bottle is connected to the jet port through a first bellows, a first electronic valve is provided in the 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 the mounting shaft, a plurality of fan blades are installed on the outer wall of the mounting shaft, the fan blades are located between the plurality of jet ports, an air outlet hole connected to the sealing shell is provided on the top of the outer wall of the sealing shell, and a second electronic valve is provided in the air outlet hole.

[0008] 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 opened on the side of the L-shaped guide plate close to the fan blades, and the alumina grinding wheel is located between the fan blades and the L-shaped guide plate.

[0009] Preferably, a dust suction port is opened on the side of the sealing shell, a dust collector is installed on the top of the mounting block, and the dust suction end of the dust collector is connected to the dust suction port through a second corrugated pipe.

[0010] 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, and a sealing shell is installed on the side of the first electric slider.

[0011] Preferably, the sealing shell is provided with an opening, the titanium alloy tube is located in the opening, a support plate is installed on the top of the bottom plate, a limit strip is installed on the top of the support plate, a limit groove is provided on the top of the limit strip, the bottom end of the tube plate is located in the limit groove, the tube plate is located between the two sealing shells, a cross plate is installed on the side of the sealing shell close to the strip plate, a second guide rail is installed at the bottom of the cross plate, a second electric slider is slidably installed on the second guide rail, a limit block is installed at the bottom of the second electric slider, and the limit block is concentric with the opening.

[0012] Preferably, an annular groove is provided on the side of the sealing shell close to the tube plate, a rubber ring is installed in the annular groove, a mounting ring is installed 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 installed in the annular groove, acetone is adsorbed in the water-absorbing sponge, and an alumina grinding wheel is located between the mounting ring and the rectangular plate.

[0013] Preferably, the limiting mechanism includes a first fixed plate and a second fixed plate symmetrically installed on the top of the base plate, a positive and negative bidirectional screw rod rotatably installed between the first fixed plate and the second fixed plate, a first motor is installed on the side of the first fixed plate away from the positive and negative bidirectional screw rod, an output shaft of the first motor is connected to the positive and negative bidirectional screw rod, a bearing is installed on the side of the second fixed plate close to the positive and negative bidirectional screw rod, an end of the positive and negative bidirectional screw rod is installed on the inner ring of the bearing, a sliding rod is installed between the first fixed plate and the second fixed plate, a sliding sleeve is installed at the bottom of the two internal thread blocks, and the sliding sleeve is slidably connected to the sliding rod.

[0014] Preferably, a loading rack and a collecting box are installed on the top of the base plate, the loading rack is used to support the titanium alloy tube, the tube sheet is located between the loading rack and the collecting box, and the base plate is provided with a mounting hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1: In the present invention, a sealed shell is filled with argon gas to wrap the weld, thereby providing protection for the weld during argon arc welding to prevent the weld from absorbing hydrogen due to heat, which may lead to brittle cracking in the later stage. Two sealed shells are used to completely seal the welds of the tube sheet and the titanium alloy tube, thereby preventing hydrogen in the outside air from being absorbed by the weld during welding, and isolating hydrogen in the outside air from the weld to prevent hydrogen absorption due to heat during welding. In addition, two sealed shells are used to seal the weld, and argon gas is used to wrap the weld, so that the weld is completely surrounded by argon gas, and argon gas is used to provide protection for the weld, thereby improving the welding quality of the weld during argon arc welding.

[0016] 2: In the present invention, two sealing shells are used to completely seal the weld, and at the same time, the parts of the tube sheet and the titanium alloy tube that are heated by welding are also sealed in the two sealing shells, so that the parts of the titanium alloy tube that are heated by welding are also in the sealing shells and protected by the argon gas in the sealing shells during welding, thereby avoiding hydrogen absorption and brittle cracking of the heated parts of the titanium alloy tube during welding, thereby improving the comprehensiveness of the protection of the weld.

[0017] 3: In the present invention, the fan blades fan the argon gas toward the L-shaped guide plate, and the guide flow channel on the side of the L-shaped guide plate can guide the argon gas, and then the L-shaped guide plate and the guide flow channel are used to guide the argon gas fanned by the fan blades to the welding part of the argon arc welding gun head, and then the argon gas is guided so that the guided argon gas blows argon gas to the welding part of the argon arc welding gun head, which fully ensures that the weld is fully protected by the argon gas during welding by the argon arc welding gun head. At the same time, the argon gas flow formed by the fanning argon gas is used to blow and cool the welding part, so as to avoid overheating of the weld and cause grain growth in the welding area, affecting the welding quality.

[0018] 4: In the present invention, the alumina grinding wheel performs circular grinding treatment on the weld, and the oxide scale on the surface of the weld can be ground away, thereby ensuring the cleanliness of the weld before welding and improving the later welding effect. The alumina grinding wheel is brought into contact with the water-absorbing sponge, and then the alumina grinding wheel is dipped in acetone in the water-absorbing sponge, and the grinding step of the alumina grinding wheel is repeated. The acetone dipped in the alumina grinding wheel can be smeared on the weld when rubbing against the weld, and then the grease on the weld is cleaned by acetone to ensure the cleanliness of the weld before welding. The weld has just been ground by the alumina grinding wheel to remove the oxide scale, and acetone is applied to remove the grease on the weld. After the weld is cleaned, the weld can be welded in time, and the weld can be welded in a fully clean state, thereby ensuring that the weld is in a clean state during welding, and improving the welding quality of the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a welding device for titanium heat exchanger processing proposed by the present invention from a first perspective; Figure 2 A schematic structural diagram of a welding device for titanium heat exchanger processing proposed by the present invention from a second perspective; Figure 3 A schematic diagram of the connection between a first fixing plate and a first motor of a welding device for machining a titanium heat exchanger proposed by the present invention; Figure 4 This is a schematic diagram of the connection between a sliding sleeve and a sliding rod of a welding device for titanium heat exchanger processing proposed by the present invention; Figure 5 This is a schematic 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; Figure 6 This is a schematic diagram of the connection between a fixing frame and a strip plate of a welding device for titanium heat exchanger processing proposed by the present invention; Figure 7 This is a 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; Figure 8 A 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; Fig. 9 A schematic diagram of the connection between a rectangular plate and a fourth guide rail of a welding device for titanium heat exchanger processing proposed by the present invention; Fig.10 A schematic diagram of the connection between a fourth electric slider and a first mounting plate of a welding device for titanium heat exchanger processing proposed by the present invention; Fig.11 This is a schematic diagram of the connection between a mounting ring and a water-absorbing sponge of a welding device for machining a titanium heat exchanger proposed by the present invention.

[0020] 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 screw rod; 7, bearing; 8, internal thread block; 9, sleeve; 10, slide rod; 11, loading rack; 12, collecting box; 13, support plate; 14, limit strip; 15, tube plate; 16, titanium alloy tube; 17, first electric telescopic rod; 18, mounting block; 19, fixing frame; 20, strip plate; 21, argon gas bottle; 22, first bellows; 23, jet nozzle; 24, vacuum cleaner; 25, second bellows; 26, sealing shell; 27, air outlet; 28, dust suction port; 29, first guide rail; 30, first electric slider; 31, horizontal Plate; 32. Second guide rail; 33. Second electric slider; 34. Limit 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. TIG welding gun head; 53. Connecting plate; 54. L-shaped guide plate; 55. Guide channel; 56. Mounting ring; 57. Water-absorbing sponge; 58. Jet hole. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Reference Figure 1-11A welding device for titanium heat exchanger processing, comprising a bottom plate 1, a tube sheet 15 and a titanium alloy tube 16, a forward and reverse bidirectional screw rod 6 is rotatably mounted on the bottom plate 1, two sections of the forward and reverse bidirectional screw rod 6 with opposite thread rotation directions are sleeved with internal thread blocks 8, a limiting mechanism for limiting the internal thread blocks 8 is provided on the bottom plate 1, and a sealing mechanism for sealing the welding position of the tube sheet 15 and the titanium alloy tube 16 is provided on the two internal thread blocks 8; The sealing mechanism includes a first electric telescopic rod 17 installed 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 installed at the end of the fixing frame 19, a sealing shell 26 is slidably installed on the side of the strip plate 20, and a welding assembly is rotatably arranged inside the sealing shell 26.

[0023] 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 the 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, a triangular alumina grinding wheel 50 is installed at the end of the piston rod of the second electric telescopic rod 49, the weld between the tube sheet 15 and the titanium alloy tube 16 can contact the end of the triangular alumina grinding wheel 50, and an argon arc welding gun head 52 is installed at the end of the piston rod of the third electric telescopic rod 51.

[0024] As a technical optimization scheme of the present invention, an annular cavity is provided inside the sealing shell 26, and a plurality of jet holes 58 connected to the cavity are provided on the inner ring wall of the sealing shell 26. A jet port 23 connected to 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, and the gas outlet end of the argon gas bottle 21 is connected to the jet port 23 through the first bellows 22, and 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, and 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 the mounting shaft, and a plurality of fan blades 45 are installed on the outer wall of the mounting shaft, and the fan blades 45 are located between the plurality of jet ports 23. An air outlet 27 connected to the sealing shell 26 is provided on the top of the outer wall of the sealing shell 26, and a second electronic valve is provided in the air outlet 27. The mounting shaft can provide a mounting position for the fan blade 45, so that the output shaft of the second motor 44 drives the mounting shaft to rotate, thereby rotating the fan blade 45.

[0025] 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, and a plurality of guide channels 55 are opened on the side of the L-shaped guide plate 54 close to the fan blades 45, and the alumina grinding wheel 50 is located between the fan blades 45 and the L-shaped guide plate 54.

[0026] As a technical optimization solution of the present invention, a dust suction port 28 is opened on the side of the sealing shell 26, and a vacuum cleaner 24 is installed on the top of the mounting block 18. The dust suction end of the vacuum cleaner 24 is connected to the dust suction port 28 through the second bellows 25. By using the vacuum cleaner 24, the second bellows 25 and the dust suction port 28 in coordination, the waste chips polished off by the alumina grinding wheel 50 can be easily collected and processed.

[0027] 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 , and the sealing shell 26 is installed on the side of the first electric slider 30 .

[0028] As a technical optimization scheme of the present invention, 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 sheet 15 is located in the limit groove, the tube sheet 15 is located between the 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 at the bottom of the cross 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, the limit block 34 is cocentric with the opening 36, and the limit groove at the top of the limit strip 14 can facilitate the limiting of the tube sheet 15.

[0029] As a technical optimization solution of the present invention, an annular groove is provided on the side of the sealing shell 26 close to the tube sheet 15, and 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 the side of the mounting ring 56 close to the third guide rail 37, and 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 mounting ring 56 and the rectangular plate 39. The annular groove can facilitate the connection between the water-absorbing sponge 57 and the mounting ring 56.

[0030] As a technical optimization scheme of the present invention, the limiting mechanism includes a first fixed plate 3 and a second fixed plate 4 symmetrically installed on the top of the base plate 1, and a positive and negative bidirectional screw rod 6 is rotatably installed between the first fixed plate 3 and the second fixed plate 4. A first motor 5 is installed on the side of the first fixed plate 3 away from the positive and negative bidirectional screw rod 6, and the output shaft of the first motor 5 is connected to the positive and negative bidirectional screw rod 6. A bearing 7 is installed on the side of the second fixed plate 4 close to the positive and negative bidirectional screw rod 6, and the end of the positive and negative bidirectional screw rod 6 is installed on the inner ring of the bearing 7. A sliding rod 10 is installed between the first fixed plate 3 and the second fixed plate 4, and a sliding sleeve 9 is installed at the bottom of the two internal thread blocks 8, and the sliding sleeve 9 is slidably connected to the sliding rod 10.

[0031] As a technical optimization solution of the present invention, a loading rack 11 and a collecting box 12 are installed on the top of the base 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. The base plate 1 is provided with a mounting hole 2. The collecting box 12 can facilitate the collection of the welded tube sheet 15 and the titanium alloy tube 16.

[0032] When the present invention is used, when it is necessary to weld the titanium alloy tube 16 and the tube sheet 15, the tube sheet 15 is firstly conveyed to the middle position of the two sealing shells 26 by using an external conveyor belt, and the first motor 5 is started. The output shaft of the first motor 5 drives the forward and reverse bidirectional screw rod 6 to rotate so that the two internal thread blocks 8 move closer to each other. The two internal thread blocks 8 move closer to each other and drive the two fixing frames 19 to move closer to each other, thereby making the two sealing shells 26 move closer to each other to clamp the tube sheet 15. The two sealing shells 26 can be used to move closer to each other to clamp and fix the titanium alloy tube 16 conveyed to the middle of the two sealing shells 26. The two sealing shells 26 are used to clamp and fix the titanium alloy tube 16 After the alloy tube 16 is clamped and fixed, the two first electric sliders 30 are started at the same time. The first electric sliders 30 slide on the first guide rail 29 to adjust the position of the sealing shell 26, and then 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 located directly above the limit bar 14. At this time, the two first electric telescopic rods 17 are started at the same time. The piston rods of the two first electric telescopic rods 17 retract to drive the two sealing shells 26 to move downward, and then drive the tube sheet 15 clamped and fixed by the two sealing shells 26 to move downward, and the tube sheet 15 can be moved down to the limit groove opened at the top of the limit bar 14, thereby completing the automatic feeding process of the tube sheet 15.

[0033] After the tube sheet 15 is automatically loaded into the limiting groove opened at the top of the limiting strip 14, the first motor 5 is started 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, one of the first electric sliders 30 is started 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 the opening 36 of one of the sealing shells 26 is made to stop when it is concentric with the titanium alloy tube 16. At this time, the first motor 5 is started 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, the first electric telescopic rod 17 connected to the sealing shell 26 is started to move the sealing shell 26 upward, and then the sealing shell 26 drives the titanium alloy tube 16 to move upward, and the titanium alloy tube 16 is moved up from the loading rack 11 so that the titanium alloy tube 16 16 is separated from the loading rack 11, and the sealing shell 26 connected with the titanium alloy tube 16 is adjusted to the center of the circle of the through hole of the titanium alloy tube 16 and the tube sheet 15 by using the cooperation of the first electric slider 30, the first guide rail 29 and the first electric telescopic rod 17. At this time, the first motor 5 is started to make the two sealing shells 26 move closer to each other, so that the titanium alloy tube 16 is inserted into the through hole of the tube sheet 15 when the sealing shell 26 connected with the titanium alloy tube 16 moves closer to the tube sheet 15, and the titanium alloy tube 16 is inserted into the through hole of the tube sheet 15. The tube 16 passes through the through hole of the tube sheet 15 and enters the opening 36 of another sealing shell 26, and at this time, the two second electric sliders 33 are started at the same time. The second electric sliders 33 slide on the second guide rails 32 to make the limit block 34 move close to the tube sheet 15, and then the titanium alloy tube 16 is pushed by the limit block 34 so that the titanium alloy tube 16 is between the two limit blocks 34, thereby 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.

[0034] After the titanium alloy tube 16 is connected to the tube sheet 15, the first motor 5 is started to make the two sealing shells 26 move closer to each other until the two sealing shells 26 contact the sides of the tube sheet 15, so that the weld between the tube sheet 15 and the titanium alloy tube 16 is located between the two sealing shells 26, and the weld between the tube sheet 15 and the titanium alloy tube 16 is sealed by the two sealing shells 26.

[0035] 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 welding angle of 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 welding seam of the tube sheet 15 and the titanium alloy tube 16 until the alumina grinding wheel 50 contacts the welding seam. At this time, the third electric slider 38 and the vacuum cleaner are started at the same time. 24. The third electric slider 38 slides on the third guide rail 37 and moves circumferentially around the opening 36, thereby driving the alumina grinding wheel 50 to perform circular grinding on the weld, so that the oxide scale on the surface of the weld can be polished away, thereby ensuring the cleanliness of the weld before welding and improving the subsequent welding effect. At the same time, the dust suction end of the vacuum cleaner 24 is used to absorb and collect the waste chips dropped by the alumina grinding wheel 50 through the second bellows 25 and the dust suction port 28, so that the waste chips generated by the welding seam polishing by the alumina grinding wheel 50 can be uniformly collected in the vacuum cleaner 24.

[0036] While the weld is being polished with the alumina grinding wheel 50, the second motor 44 can be started, and the output shaft of the second motor 44 drives the fan blades 45 to rotate. The wind fanned out by the fan blades 45 is guided by the guide channel 55 on the L-shaped guide plate 54 to the contact portion between the alumina grinding wheel 50 and the weld, thereby blowing away the waste chips generated when the alumina grinding wheel 50 polishes the weld, and the waste chips generated when the alumina grinding wheel 50 polishes the weld can be blown away, making it convenient for the dust suction port 28 to absorb and collect the waste chips.

[0037] After the oxide scale on the surface of the weld is polished and removed, the third motor 47 and the second electric telescopic rod 49 are used again to make the aluminum oxide grinding wheel 50 contact with the water-absorbing sponge 57, so that the aluminum oxide grinding wheel 50 can dip into the acetone in the water-absorbing sponge 57, and repeat the polishing steps of the aluminum oxide grinding wheel 50. The acetone dipped by the aluminum oxide grinding wheel 50 can be smeared on the weld when rubbing against the weld, and then the acetone can be used to clean the oil stains on the weld to ensure the cleanliness of the weld before welding.

[0038] At this time, the first electronic valve in the jet port 23 and the second electronic valve in the gas outlet 27 are started, and the argon in the argon bottle 21 enters the sealed shell 26 through the first bellows 22, the jet port 23 and the jet hole 58. In addition, based on the principle that the density of argon is greater than that of hydrogen, when argon is introduced into the sealed shell 26, the density of argon introduced into the sealed shell 26 is greater than that of hydrogen, and the argon in the sealed shell 26 is at the bottom of the sealed shell 26, thereby squeezing the hydrogen in the sealed shell 26 out through the gas outlet 27, so that the sealed shell 26 is filled with argon. When the sealed shell 26 is filled with argon, the second electronic valve in the gas outlet 27 is closed, so that the sealed shell 26 is filled with argon. The weld is wrapped with full argon gas, thereby providing protection for the weld during argon arc welding to prevent the weld from absorbing hydrogen due to heat, which may lead to brittle cracking in the later stage. The welds of the tube sheet 15 and the titanium alloy tube 16 are completely sealed with two sealing shells 26 to prevent hydrogen in the outside air from being absorbed by the weld during welding. The hydrogen in the outside air can be isolated from the weld to prevent hydrogen absorption due to heat during welding. The weld is sealed with two sealing shells 26 and wrapped with argon gas so that the weld is completely surrounded by argon gas. Argon gas is used to provide protection for the weld, thereby improving the welding quality of the weld during argon arc welding. The weld is sealed with two sealing shells 26 to prevent the weld from being affected by external factors during welding and affecting the welding effect.

[0039] The weld is completely sealed by two sealing shells 26, and the parts of the tube sheet 15 and the titanium alloy tube 16 that are heated by welding are also sealed in the two sealing shells 26. During welding, the parts of the titanium alloy tube 16 that are heated by welding are also in the sealing shells 26 and protected by the argon gas in the sealing shells 26, thereby avoiding hydrogen absorption and brittle cracking of the heated parts of the titanium alloy tube 16 during welding, thereby improving the comprehensiveness of the protection of the weld.

[0040] After the weld is cleaned, the third motor 47 is started to rotate the argon arc welding gun head 52 to an angle suitable for the weld, and the third electric telescopic rod 51 is started to move the argon arc welding gun head 52 close to the weld until the argon arc welding gun head 52 reaches a preset distance from the weld and stops. At this time, the third electric slider 38 is started, and the third electric slider 38 slides on the third guide rail 37 to allow the argon arc welding gun head 52 to perform circumferential welding around the weld, thereby completing the welding of the weld in one go. The welding process of the weld can be completed without pausing, and the welding process of the weld can be completed in one go, thereby improving the welding quality of the weld.

[0041] And when welding the weld, the second motor 44 is started, and the output shaft of the second motor 44 drives the fan blades 45 to rotate to fan the argon gas ejected from the jet hole 58, and the fan blades 45 fans the argon gas to the L-shaped guide plate 54, and the guide channel 55 on the side of the L-shaped guide plate 54 can guide the argon gas, and then the L-shaped guide plate 54 and the guide channel 55 are used to guide the argon gas fanned by the fan blades 45 to the welding part of the argon arc welding gun head 52, and then the argon gas is guided, so that the guided argon gas blows argon gas to the welding part of the argon arc welding gun head 52, which fully ensures that the weld of the argon arc welding gun head 52 is fully protected by argon gas, and at the same time, the argon gas flow formed by the fanning argon gas is used to blow and cool the welding part, so as to avoid overheating of the weld welding part and cause grain growth in the welding area, affecting the welding quality.

[0042] In addition, the rotation of the fan blades 45 can fan the argon gas in the sealed shell 26 so that the argon gas is evenly distributed in the sealed shell 26, so that all angles in the sealed shell 26 are filled with argon gas. The rotating fan blades 45 can be used to fan the argon gas to achieve a stirring effect on the argon gas, so that the argon gas is evenly distributed in the sealed shell 26, ensuring that all angles in the sealed shell 26 are filled with argon gas.

[0043] And when the weld is welded by the argon arc welding gun head 52, the weld has just been polished by the alumina grinding wheel 50 to remove the oxide scale, and acetone is applied to remove the oil stains on the weld. After the weld is cleaned, the weld can be welded in time, which can complete the welding of the weld in a fully clean state, thereby ensuring that the weld is in a clean state during welding, improving the welding quality of the weld, and at the same time using two sealing shells 26 to seal the welding process throughout the process, so that the weld can be completed under the condition of being fully protected by argon gas, and the use of welding The sealing can also prevent external dust and impurities from falling and adhering to the weld that has just been welded and affecting the welding quality.

[0044] When welding the weld, two sealing shells 26 are used to seal the weld. The two sealing 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 it is welded to the tube sheet 15, ensuring that the titanium alloy tube 16 and the tube sheet 15 are perpendicular to each other when they are welded, avoiding the titanium alloy tube 16 and the tube sheet 15 from being skewed during welding, and improving the welding accuracy between the titanium alloy tube 16 and the tube sheet 15. In addition, two limit blocks 34 are used to clamp and fix the two ends of the titanium alloy tube 16, so that the titanium alloy tube 16 can be fixed between the two limit blocks 34 during welding, and the limit groove on the top of the limit bar 14 fixes the tube sheet 15, so that both the titanium alloy tube 16 and the tube sheet 15 are fixed when they are welded, thereby improving the stability of the titanium alloy tube 16 and the tube sheet 15 during welding.

[0045] After the welding of the tube sheet 15 and the titanium alloy tube 16 is completed, the first motor 5 is started again to make the two sealing shells 26 break away from the contact with the tube sheet 15, and the first electric slider 30 is used to slide on the first guide rail 29, so that the two sealing shells 26 are between the limit bar 14 and the loading rack 11. At this time, the first motor 5 is started again to make the two sealing shells 26 contact each other, and the first electric slider 30 is made to slide on the first guide rail 29 again, so that the two contacting sealing shells 26 can push the welded tube sheet 15 and the titanium alloy tube 16, and then push the welded tube sheet 15 and the titanium alloy tube 16 from the limit groove into the collection box 12 to complete the unloading processing of the welded tube sheet 15 and the titanium alloy tube 16.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which 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 annular 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).

2. The welding equipment for titanium heat exchanger processing according to claim 1 is characterized in that: 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), a weld between the tube plate (15) and the titanium alloy tube (16) can contact 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).

3. The welding equipment for titanium heat exchanger processing according to claim 2 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).

4. The welding equipment for titanium heat exchanger processing according to claim 3 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).

5. 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).

6. The welding equipment for titanium heat exchanger processing according to claim 1, 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).

7. The welding equipment for titanium heat exchanger processing according to claim 1 is characterized in that: 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).

8. The welding equipment for titanium heat exchanger processing according to claim 2, 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).

9. The welding equipment for titanium heat exchanger processing according to claim 1, 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).

10. 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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