Automatic welding device and method for assembling cryogenic refrigerator

Abstract

The invention relates to the technical field of welding, and particularly discloses an automatic welding device and method for assembling a cryogenic refrigerator, the automatic welding device comprises a sleeve, two pipelines arranged in the sleeve in a sleeving manner, and a first clamping mechanism arranged at the top of a machine table and used for fixing the sleeve, so that after the pipelines are inserted into the sleeve, the pipelines and the sleeve are welded; the sleeve is arranged outside the two pipelines, needing to be welded, of the cryogenic refrigerator in a sleeving mode, so that the two pipelines are connected and fixed, compared with a traditional mode that the end faces of the two pipelines are directly welded, welding is conducted from the outer walls of the pipelines, welding slag and the like are prevented from entering the pipelines, and the welding efficiency is improved. And the welding area of the sleeve and the pipelines is increased through the open grooves, the welding stability is improved, it is guaranteed that the two pipelines abut against each other through the limiting rings, meanwhile, flowing of liquid in the pipelines is prevented from being affected, and therefore actual use of the cryogenic refrigerator is not affected.

Description

Technical Field

[0001] This invention relates to the field of welding technology, specifically to an automated welding device and method for assembling cryogenic refrigerators. Background Technology

[0002] Welding provides high sealing performance, preventing refrigerant leakage and ensuring long-term stable system operation. At the same time, welded joints are strong, resistant to vibration and temperature changes, and meet the stringent requirements of cryogenic operating conditions, making them widely used in the assembly of cryogenic refrigerators.

[0003] CN211248866U discloses a welding device for assembling cryogenic refrigerators. The background art raises the following problem: The welding machines used for assembling cryogenic refrigerators on the market are too simple in structure and lack parts storage devices. Most of them are placed directly on the ground, which often causes parts to wear or be lost. In addition, the welding hose is too long and drags on the ground, causing serious wear.

[0004] Based on existing technologies, the following problems exist: Existing automated welding equipment for assembling cryogenic refrigerators typically only welds the connection point after two pipes are joined, resulting in a small welding area and affecting welding stability. However, due to the high temperature difference resistance and high sealing requirements of cryogenic refrigerators, the stability of subsequent use is also affected. Referring to the aforementioned application documents, the welding machine's wire harness is only wound up to reduce wear, but this does not solve the problem of welding stability and has certain shortcomings. To solve the above problems, an automated welding device and method for assembling cryogenic refrigerators is proposed. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automated welding device for assembling a cryogenic refrigerator, comprising a machine base, a sleeve, two pipes fitted inside the sleeve, and a first clamping mechanism disposed on the top of the machine base for fixing the sleeve, so that after the pipes are inserted into the sleeve, the pipes and the sleeve are welded together to connect the pipes for assembling the cryogenic refrigerator. Second clamping mechanisms for fixing the pipes are disposed on both sides of the first clamping mechanism on the top of the machine base, and a welding mechanism is disposed on the top of the machine base between the first and second clamping mechanisms. The sleeve includes: The limiting ring is fixedly sleeved on the middle of the inner wall of the sleeve to limit the position of the pipe inserted into the sleeve. The inner diameter of the limiting ring is the same as the inner diameter of the pipe. The outer wall of the limiting ring is sealed to the inner wall of the sleeve. Grooves are cut at both ends of the sleeve to increase the area that can be welded between the pipe and the sleeve. The inner wall of the groove is designed to be inclined.

[0006] Furthermore, the first clamping mechanism includes: The first ring body is fixedly installed on the top of the machine platform. The second ring body is fixedly sleeved on the inner wall of the first ring body, and the inner wall diameter of the first ring body is larger than the outer wall diameter of the second ring body, so that there is a gap between the first ring body and the second ring body. The clamping plates are movably disposed within the second ring body and arranged in a circular array to clamp and fix the sleeve.

[0007] Furthermore, the first clamping mechanism also includes: A bevel gear disc is rotatably mounted on the outer wall of the second ring body and located within the first ring body; A threaded rod is rotatably mounted on the side wall of the first ring body and extends into the second ring body. A bevel gear is fixedly sleeved on one end of the threaded rod located between the first and second ring bodies. The bevel gear meshes with a bevel gear disc. A threaded tube is threadedly connected to the side wall of one end of the threaded rod located in the second ring body. The end of the threaded tube is fixedly connected to the clamping plate. The outer wall of the threaded tube is slidably connected to the inner wall of the second ring body.

[0008] Furthermore, the second clamping mechanism is identical to the first clamping mechanism except for its dimensions. The second ring body of both the first and second clamping mechanisms is coaxially arranged with the first ring body. A drive mechanism for driving the first and second clamping mechanisms is provided at the top of the machine base. A moving mechanism is provided at the bottom of the clamping plate of the second clamping mechanism, and the moving mechanism includes: A slide groove is formed at the bottom of the clamping plate of the second clamping mechanism, and a guide groove is formed on the top inner wall of the slide groove; A slider is fitted inside a groove. A guide block is fixedly provided on the top of the slider. The side wall of the guide block fits against the inner wall of the guide groove. A first spring is fitted inside the guide groove, and the first spring is located on the side of the guide block closer to the first limiting mechanism.

[0009] Furthermore, the drive mechanism includes: The first servo motor is fixedly mounted on the top of the machine base. The output shaft of the first servo motor is equipped with a transmission mechanism, which drives the bevel gear disks of the first clamping mechanism and the second clamping mechanism to rotate synchronously through the transmission mechanism. The tensioning mechanism is located on the outside of the transmission mechanism to tension the chain of the transmission mechanism.

[0010] Furthermore, the welding mechanism includes: A rotating ring is rotatably mounted on the top of the base and located between the first ring body of the first clamping mechanism and the second clamping mechanism; The housing is hinged to the inner wall of the rotating ring, and a first electric push rod is fixedly provided on the side wall of the rotating ring. The telescopic shaft of the first electric push rod is hinged to the outer wall of the housing to adjust the angle of the housing. A welding torch is movably provided on the inner wall of the housing.

[0011] Furthermore, the welding mechanism also includes: The first electromagnet is fixedly installed on the inner wall of the housing, and the second electromagnet is sleeved on the inner wall of the housing. A connecting rod is fixedly installed on the side of the second electromagnet away from the first electromagnet. The connecting rod extends outside the housing and is fixedly connected to the welding gun. A second spring is sleeved on the side wall of the connecting rod inside the housing, and the second spring is located on the side of the second electromagnet away from the first electromagnet.

[0012] Furthermore, the welding mechanism also includes: The toothed grooves are arranged in a ring array on the inner wall of the rotating ring; The second servo motor is fixedly mounted on the top of the base. The output shaft of the second servo motor is fixedly equipped with a transmission gear through a coupling, and the transmission gear meshes with the tooth groove.

[0013] Furthermore, both ends of the machine are equipped with a pushing mechanism to ensure that the pipe is pressed tightly against the sleeve. The pushing mechanism includes: The second electric push rod is fixedly mounted at the end of the base, and the telescopic shaft of the second electric push rod is fixedly equipped with a clamping seat.

[0014] This invention also provides a method of using an automated welding device for assembling cryogenic refrigerators. The method, employing the aforementioned automated welding device for assembling cryogenic refrigerators, includes the following steps: S1: The sleeve is clamped and fixed by the first clamping mechanism, and at the same time, the two pipes to be welded are fixed by the second clamping mechanism. Then, the two pipes are inserted into the sleeve. S2: After the two pipes are inserted into the sleeve, the sleeve and pipes are welded together by a welding mechanism to connect the pipes and assemble the cryogenic refrigerator.

[0015] This invention provides an automated welding apparatus and method for assembling cryogenic refrigerators. Compared with the prior art, it has the following advantages: 1. This invention connects and fixes two cryogenic refrigerator pipes by sleeves being fitted over the two pipes to be welded. Compared to the traditional method of directly welding the ends of the two pipes, welding is performed from the outer wall of the pipes, which avoids welding slag from entering the pipes. Furthermore, the grooves increase the welding area between the sleeve and the pipes, improving the stability of the weld. The limiting rings ensure that the two pipes are tightly pressed together while avoiding affecting the flow of liquid inside the pipes, thus not affecting the actual use of the cryogenic refrigerator.

[0016] 2. The present invention can synchronously drive the first clamping mechanism and the second clamping mechanism to clamp the sleeve and the pipe through the driving mechanism. After clamping, the sleeve and the pipe are arranged coaxially to facilitate the insertion of the pipe into the sleeve, thereby improving the stability of the connection between the sleeve and the pipe and facilitating subsequent welding.

[0017] 3. The present invention facilitates the disconnection of the first clamping mechanism and the second clamping mechanism through the driving mechanism, thereby making it easy to adjust the position of the clamping plate of the first clamping mechanism or the second clamping mechanism separately. This allows for adjustment based on the difference in outer diameter between the sleeve and the pipe, ensuring that the pipe and the sleeve are in a coaxial position after clamping. This invention is suitable for welding pipes of different sizes.

[0018] 4. The present invention facilitates the insertion of the pipe into the sleeve by means of a moving mechanism and a pushing mechanism, thereby facilitating subsequent welding and ensuring that the pipe is tightly pressed against the limiting ring. This prevents liquid from entering the outer wall of the pipe and the inner wall of the sleeve after welding, making it convenient for practical use and not affecting the use of clamping the pipe. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the rear structure of the machine tool of the present invention; Figure 3 This is a schematic diagram of the structure of the first clamping mechanism, the second clamping mechanism, the welding mechanism, the sleeve, and the driving mechanism of the present invention; Figure 4 This is a schematic diagram of the top structure of the first servo motor and tensioning mechanism of the present invention; Figure 5 This is a schematic diagram of the transverse cross-sectional structure of the first and second ring bodies of the present invention; Figure 6 This is a schematic diagram of the longitudinal cross-sectional structure of the threaded tube of the present invention; Figure 7 This is a schematic diagram of the second clamping mechanism and the moving mechanism of the present invention; Figure 8 This is a schematic diagram of the welding mechanism structure of the present invention; Figure 9 This is a schematic diagram of the tooth groove structure of the present invention; Figure 10 This is a schematic diagram of the longitudinal cross-sectional structure of the housing of the present invention; Figure 11 This is a schematic diagram of the longitudinal cross-sectional structure of the sleeve of the present invention.

[0020] The reference numerals in the above figures are as follows: 1. Machine base; 2. Drive mechanism; 3. First clamping mechanism; 4. Welding mechanism; 5. Pipe; 6. Second clamping mechanism; 7. Sleeve; 8. Pushing mechanism; 9. Moving mechanism; 21. First servo motor; 22. Tensioning mechanism; 23. Transmission mechanism; 31. First ring body; 32. Second ring body; 33. Bevel gear disc; 34. Threaded rod; 35. Bevel gear; 36. Threaded tube; 37. Clamping plate; 41. Rotating ring; 42. Connecting rod; 43. Second servo motor; 44. Transmission gear; 45. Welding torch; 46. Gear groove; 47. Housing; 48. First electric push rod; 49. First electromagnet; 491. Second electromagnet; 71. Limiting ring; 72. Grooving; 81. Second electric actuator; 82. Clamping seat; 91. Slider; 92. Guide block; 93. Guide groove; 94. Slide groove. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 11 An automated welding device for assembling a cryogenic refrigerator includes a machine base 1, a sleeve 7, two pipes 5 fitted inside the sleeve 7, and a first clamping mechanism 3 located on the top of the machine base 1 for fixing the sleeve 7. The device allows the pipes 5 to be inserted into the sleeve 7, and then welded to the sleeve 7 to connect the pipes 5 for assembling the cryogenic refrigerator. Second clamping mechanisms 6 are located on the top of the machine base 1 and on both sides of the first clamping mechanism 3 for fixing the pipes 5. A welding mechanism 4 is located on the top of the machine base 1 and between the first clamping mechanism 3 and the second clamping mechanism 6. The sleeve 7 includes: The limiting ring 71 is fixedly sleeved on the middle of the inner wall of the sleeve 7 to limit the position of the pipe 5 inserted into the sleeve 7. The inner diameter of the limiting ring 71 is the same as the inner diameter of the pipe 5. The outer wall of the limiting ring 71 is sealed with the inner wall of the sleeve 7. Grooves 72 are formed at both ends of sleeve 7 to increase the area that can be welded between pipe 5 and sleeve 7. The inner wall of groove 72 is designed to be inclined.

[0023] In practical implementation, the sleeve 7 is fitted over the two cryogenic refrigeration pipes 5 that need to be welded, so that the outer walls of the two pipes 5 are welded to the sleeve 7, thereby connecting and fixing the two pipes 5. Compared with the traditional method of directly welding the end faces of the two pipes 5, welding from the outer wall of the pipes 5 avoids welding slag from entering the pipes 5. In addition, the groove 72 increases the area that the sleeve 7 and the pipes 5 can weld, improving the stability of the welding. Furthermore, the limiting ring 71 ensures that the two pipes 5 are tightly pressed together, while avoiding affecting the flow of liquid in the pipes 5, thus not affecting the actual use of the cryogenic refrigeration machine.

[0024] By making the inner diameter of the limiting ring 71 the same as the inner diameter of the pipe 5, the flow of liquid in the pipe 5 is not affected, and the inner wall of the sleeve 7 fits the outer wall of the pipe 5, which facilitates actual welding and improves stability.

[0025] The dimensions of sleeve 7, limit ring 71 and slot 72 are all adjusted according to the dimensions of pipe 5 to accommodate pipes of different sizes.

[0026] Please see Figure 5 and Figure 6 The first clamping mechanism 3 includes: The first ring body 31 is fixedly installed on the top of the machine base 1. The inner wall of the first ring body 31 is fixedly fitted with the second ring body 32, and the inner wall diameter of the first ring body 31 is larger than the outer wall diameter of the second ring body 32, so that there is a gap between the first ring body 31 and the second ring body 32. The clamping plate 37 is movably disposed within the second ring body 32 and arranged in a ring array to clamp and fix the sleeve 7.

[0027] The first clamping mechanism 3 also includes: The bevel gear disk 33 is rotatably disposed on the outer wall of the second ring body 32 and located inside the first ring body 31; A threaded rod 34 is rotatably disposed on the side wall of the first ring body 31 and extends into the second ring body 32. A bevel gear 35 is fixedly sleeved on one end of the threaded rod 34 located between the first ring body 31 and the second ring body 32. The bevel gear 35 meshes with the bevel gear disk 33. A threaded tube 36 is threadedly connected to the side wall of the threaded rod 34 located inside the second ring body 32. The end of the threaded tube 36 is fixedly connected to the clamping plate 37. The outer wall of the threaded tube 36 is slidably connected to the inner wall of the second ring body 32.

[0028] In specific implementation, the drive mechanism 2 drives the bevel gear disk 33 of the first clamping mechanism 3 to rotate. While the bevel gear disk 33 rotates, it drives the bevel gear 35 and the threaded rod 34 to rotate. While the threaded rod 34 rotates, it drives the threaded tube 36 and the clamping plate 37 to move. Through the transmission of the bevel gear disk 33 and the bevel gear 35, as well as the transmission of the threaded rod 34 and the threaded tube 36, the clamping plates 37 arranged in a ring array can move closer to each other or further away from each other to clamp and fix the sleeve 7 or remove the fixation, so as to ensure the stability of the sleeve 7. This facilitates the subsequent welding of the pipe 5 and the sleeve 7 after the pipe 5 is inserted into the sleeve 7.

[0029] The threaded rod 34 and the threaded tube 36 are limited by the first ring body 31 and the second ring body 32, which improves the stability of the movement of the threaded tube 36 and the stability of the rotation of the threaded rod 34.

[0030] Please see Figure 5 and Figure 7 The second clamping mechanism 6 is the same as the first clamping mechanism 3 except for its size. The second ring body 32 and the first ring body 31 of the first clamping mechanism 3 and the second clamping mechanism 6 are coaxially arranged. The top of the machine base 1 is provided with a drive mechanism 2 for driving the first clamping mechanism 3 and the second clamping mechanism 6 to operate. The bottom of the clamping plate 37 of the second clamping mechanism 6 is provided with a moving mechanism 9.

[0031] In specific implementation, the bevel gear disk 33 of the second clamping mechanism 6 is synchronously driven to rotate by the drive mechanism 2, specifically the step of clamping and fixing the sleeve 7 by the first clamping mechanism 3, thereby clamping and fixing the pipe 5. Since the first ring 31 and the second ring 32 of the first clamping mechanism 3 and the second clamping mechanism 6 are coaxially arranged and both clamp the sleeve 7 and the pipe 5 centripetally, in addition, the first clamping mechanism 3 and the second clamping mechanism 6 are both driven by the drive mechanism 2, so that after the first clamping mechanism 3 and the second clamping mechanism 6 clamp the sleeve 7 and the pipe 5, the sleeve 7 and the pipe 5 are arranged coaxially, so that the pipe 5 can be inserted into the sleeve 7 through the cooperation of the moving mechanism 9 and the pushing mechanism 8, thereby improving the stability of the connection between the sleeve 7 and the pipe 5 and facilitating subsequent welding.

[0032] Please see Figure 3 and Figure 4 The drive mechanism 2 includes: The first servo motor 21 is fixedly mounted on the top of the machine base 1. The output shaft of the first servo motor 21 is equipped with a transmission mechanism 23, so as to drive the bevel gear disk 33 of the first clamping mechanism 3 and the second clamping mechanism 6 to rotate synchronously through the transmission mechanism 23. Tensioning mechanism 22 is located on the outside of transmission mechanism 23 to tension the chain of transmission mechanism 23.

[0033] In specific implementation, the drive mechanism 2 facilitates the synchronous rotation of the bevel gear disk 33 of the first clamping mechanism 3 and the second clamping mechanism 6, thereby facilitating the synchronous movement of the clamping plates 37 of the first clamping mechanism 3 and the second clamping mechanism 6 towards or away from each other, so as to synchronously clamp and fix the sleeve 7 and the pipe 5, and to make the sleeve 7 and the pipe 5 coaxially arranged, so as to facilitate the subsequent insertion of the pipe 5 into the sleeve 7.

[0034] The tensioning mechanism 22 facilitates the disconnection of the first clamping mechanism 3 and the second clamping mechanism 6, thereby allowing for individual adjustment of the position of the clamping plate 37 of the first clamping mechanism 3 or the second clamping mechanism 6. This adjustment is made based on the difference in outer diameter between the sleeve 7 and the pipe 5, ensuring that the pipe 5 and the sleeve 7 are in a coaxial position after clamping.

[0035] The transmission mechanism 23 includes a transmission bevel gear 35 that meshes with the bevel gear disk 33. The inner wall of the transmission bevel gear 35 is fixedly provided with a rotating shaft that is rotatably connected to the first ring body 31. The side wall of the rotating shaft located outside the first ring body 31 is connected to the transmission through gear and chain transmission, so that the first servo motor 21 synchronously drives the first clamping mechanism 3 and the second clamping mechanism to operate. When the first clamping mechanism 3 is adjusted separately, the rotating shaft of the first clamping mechanism 3 can be rotated by an external wrench, thereby driving the corresponding bevel gear disk 33 to rotate. Alternatively, the first clamping mechanism 3 can be adjusted separately by the servo motor so that the clamping plate 37 of the first clamping mechanism 3 is arranged correspondingly to the clamping plate 37 of the second clamping mechanism 6.

[0036] The tensioning mechanism 22 tensions the chain of the transmission mechanism 23 by means of the longitudinal position of the gear, thereby disengaging the transmission of the first clamping mechanism 3 and the second clamping mechanism 6. The tensioning mechanism 22 is existing technology and will not be described in detail here.

[0037] Please see Figure 7 The mobile mechanism 9 includes: A slide 94 is provided at the bottom of the clamping plate 37 of the second clamping mechanism 6, and a guide groove 93 is provided on the top inner wall of the slide 94; The slider 91 is fitted inside the slide groove 94. A guide block 92 is fixedly provided on the top of the slider 91. The side wall of the guide block 92 is in contact with the inner wall of the guide groove 93. A first spring is fitted inside the guide groove 93, and the first spring is located on the side of the guide block 92 close to the first limiting mechanism.

[0038] In practice, the slider 91 moves within the groove 94, thereby clamping and fixing the pipe 5 by the first clamping mechanism 3. Under the action of the pushing mechanism 8, the pipe 5 can be moved along its axial direction, thereby inserting the pipe 5 into the sleeve 7.

[0039] By setting guide groove 93 and guide block 92, under the action of the first spring, after the clamping of pipe 5 is released, slider 91 moves away from the first clamping mechanism 3, so that pipe 5 can be inserted into sleeve 7 after clamping pipe 5 next time, and restricts slider 91 from disengaging from groove 94.

[0040] Please see Figure 1 Both ends of the machine base 1 are equipped with a pushing mechanism 8 to ensure that the pipe 5 is pressed tightly against the sleeve 7. The pushing mechanism 8 includes: The second electric push rod 81 is fixedly mounted at the end of the base, and the telescopic shaft of the second electric push rod 81 is fixedly provided with a clamping seat 82.

[0041] In practical implementation, the second electric push rod 81 drives the clamping seat 82 to move, thereby moving the pipe 5 away from the sleeve 7, so as to drive the slider 91 to move along the slide groove 94, thereby inserting the pipe 5 into the sleeve 7 and making the pipe 5 abut against the limiting ring 71. This prevents liquid from entering the outer wall of the pipe 5 and the inner wall of the sleeve 7 after welding, which is convenient for actual use.

[0042] Example 2: Please refer to Figure 3 , Figure 8 , Figure 9 and Figure 10 The technical difference between this embodiment and Embodiment 1 is that the welding mechanism 4 includes: The rotating ring 41 is rotatably mounted on the top of the base and is located between the first ring body 31 of the first clamping mechanism 3 and the second clamping mechanism 6. The housing 47 is hinged to the inner wall of the rotating ring 41, and the side wall of the rotating ring 41 is fixedly provided with a first electric push rod 48. The telescopic shaft of the first electric push rod 48 is hinged to the outer wall of the housing 47 to adjust the angle of the housing 47. The inner wall of the housing 47 is movably provided with a welding torch 45.

[0043] Welding mechanism 4 also includes: The first electromagnet 49 is fixedly disposed on the inner wall of the housing 47, and the second electromagnet 491 is sleeved on the inner wall of the housing 47. The connecting rod 42 is fixedly disposed on the side of the second electromagnet 491 away from the first electromagnet 49. The connecting rod 42 extends to the outside of the housing 47 and is fixedly connected to the welding torch 45. A second spring is sleeved on the side wall of the connecting rod 42 located inside the housing 47, and the second spring is located on the side of the second electromagnet 491 away from the first electromagnet 49.

[0044] Welding mechanism 4 also includes: The toothed grooves 46 are arranged in a ring array on the inner wall of the rotating ring 41; The second servo motor 43 is fixedly mounted on the top of the base. The output shaft of the second servo motor 43 is fixedly mounted with a transmission gear 44 through a coupling, and the transmission gear 44 meshes with the tooth groove 46.

[0045] In practice, when the pipe 5 is inserted into the sleeve 7 and pressed against the limiting ring 71, a welding machine is connected to the welding gun 45. Then, the first electric push rod 48 drives one end of the housing 47 to move, so that the other end of the housing 47 is hinged to the rotating ring 41 and rotates, thereby adjusting the angle of the welding gun 45 so that the welding gun 45 is aligned between the slot 72 and the pipe 5. Then, the repulsive force generated between the first electromagnet 49 and the second electromagnet 491 drives the connecting rod 42 and the welding gun 45 to move to the pipe 5 and the slot 72 for welding. The second servo motor 43 drives the gear to rotate, so that the rotating ring 41 is rotated through the tooth groove 46, thereby welding the pipe 5 and the sleeve 7 along the circumference of the pipe 5.

[0046] The first servo motor 21 and other electronic components of the present invention are all connected to the controller and external power supply through wires to facilitate actual control and use, and the welding gun 45 is connected to an external welding machine. These are all prior art and will not be described in detail here.

[0047] This invention also provides a method for using an automated welding device for assembling cryogenic refrigerators. The method includes the following steps: S1: The sleeve 7 is clamped and fixed by the first clamping mechanism 3. At the same time, the two pipes 5 to be welded are fixed by the second clamping mechanism 6. Then, the two pipes 5 are inserted into the sleeve 7. During the process of the two pipes 5 entering the sleeve 7, the pushing mechanism 8 and the moving mechanism 9 cooperate to enable the first clamping mechanism 3 to stably clamp the pipes 5 while enabling the pipes 5 to move along their axial direction, so that the ends of the two pipes 5 that are close to each other are inserted into the sleeve 7 and abut against the limiting ring 71. S2: After the two pipes 5 are inserted into the sleeve 7, the sleeve 7 and the pipes 5 are welded by the welding mechanism 4 to connect the pipes 5 for the assembly of the cryogenic refrigerator. During welding, the area that can be welded between the pipes 5 and the sleeve 7 is increased by the slot 72, thereby improving the stability of the welding.

[0048] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0049] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automated welding apparatus for assembling cryogenic refrigerators, comprising a machine base, characterized in that, It also includes a sleeve, two pipes fitted inside the sleeve, and a first clamping mechanism located on the top of the machine for fixing the sleeve. After the pipes are inserted into the sleeve, the pipes and sleeve are welded together to connect the pipes for assembling the cryogenic refrigerator. A second clamping mechanism for fixing the pipes is located on both sides of the first clamping mechanism on the top of the machine. A welding mechanism is located on the top of the machine between the first and second clamping mechanisms. The sleeve includes: The limiting ring is fixedly sleeved on the middle of the inner wall of the sleeve to limit the position of the pipe inserted into the sleeve. The inner diameter of the limiting ring is the same as the inner diameter of the pipe. The outer wall of the limiting ring is sealed to the inner wall of the sleeve. Grooves are cut at both ends of the sleeve to increase the area that can be welded between the pipe and the sleeve. The inner wall of the groove is designed to be inclined.

2. The automated welding device for assembling cryogenic refrigerators according to claim 1, characterized in that, The first clamping mechanism includes: The first ring body is fixedly installed on the top of the machine platform. The second ring body is fixedly sleeved on the inner wall of the first ring body, and the inner wall diameter of the first ring body is larger than the outer wall diameter of the second ring body, so that there is a gap between the first ring body and the second ring body. The clamping plates are movably disposed within the second ring body and arranged in a circular array to clamp and fix the sleeve.

3. The automated welding device for assembling cryogenic refrigerators according to claim 2, characterized in that, The first clamping mechanism further includes: A bevel gear disc is rotatably mounted on the outer wall of the second ring body and located within the first ring body; A threaded rod is rotatably mounted on the side wall of the first ring body and extends into the second ring body. A bevel gear is fixedly sleeved on one end of the threaded rod located between the first and second ring bodies. The bevel gear meshes with a bevel gear disc. A threaded tube is threadedly connected to the side wall of one end of the threaded rod located in the second ring body. The end of the threaded tube is fixedly connected to the clamping plate. The outer wall of the threaded tube is slidably connected to the inner wall of the second ring body.

4. An automated welding device for assembling cryogenic refrigerators according to claim 2, characterized in that, The second clamping mechanism is identical to the first clamping mechanism except for its dimensions. The second ring body of both the first and second clamping mechanisms is coaxially arranged with the first ring body. A drive mechanism for driving the first and second clamping mechanisms is provided at the top of the machine base. A moving mechanism is provided at the bottom of the clamping plate of the second clamping mechanism, and the moving mechanism includes: A slide groove is formed at the bottom of the clamping plate of the second clamping mechanism, and a guide groove is formed on the top inner wall of the slide groove; A slider is fitted inside a groove. A guide block is fixedly provided on the top of the slider. The side wall of the guide block fits against the inner wall of the guide groove. A first spring is fitted inside the guide groove, and the first spring is located on the side of the guide block closer to the first limiting mechanism.

5. An automated welding device for assembling cryogenic refrigerators according to claim 4, characterized in that, The drive mechanism includes: The first servo motor is fixedly mounted on the top of the machine base. The output shaft of the first servo motor is equipped with a transmission mechanism, which drives the bevel gear disks of the first clamping mechanism and the second clamping mechanism to rotate synchronously through the transmission mechanism. The tensioning mechanism is located on the outside of the transmission mechanism to tension the chain of the transmission mechanism.

6. An automated welding device for assembling cryogenic refrigerators according to claim 1, characterized in that, The welding mechanism includes: A rotating ring is rotatably mounted on the top of the base and located between the first ring body of the first clamping mechanism and the second clamping mechanism; The housing is hinged to the inner wall of the rotating ring, and a first electric push rod is fixedly provided on the side wall of the rotating ring. The telescopic shaft of the first electric push rod is hinged to the outer wall of the housing to adjust the angle of the housing. A welding torch is movably provided on the inner wall of the housing.

7. An automated welding device for assembling cryogenic refrigerators according to claim 6, characterized in that, The welding mechanism also includes: The first electromagnet is fixedly installed on the inner wall of the housing, and the second electromagnet is sleeved on the inner wall of the housing. A connecting rod is fixedly installed on the side of the second electromagnet away from the first electromagnet. The connecting rod extends outside the housing and is fixedly connected to the welding gun. A second spring is sleeved on the side wall of the connecting rod inside the housing, and the second spring is located on the side of the second electromagnet away from the first electromagnet.

8. An automated welding device for assembling cryogenic refrigerators according to claim 7, characterized in that, The welding mechanism also includes: The toothed grooves are arranged in a ring array on the inner wall of the rotating ring; The second servo motor is fixedly mounted on the top of the base. The output shaft of the second servo motor is fixedly equipped with a transmission gear through a coupling, and the transmission gear meshes with the tooth groove.

9. An automated welding device for assembling cryogenic refrigerators according to claim 1, characterized in that, Both ends of the machine are equipped with a pushing mechanism to press the pipe tightly against the sleeve. The pushing mechanism includes: The second electric push rod is fixedly mounted at the end of the base, and the telescopic shaft of the second electric push rod is fixedly equipped with a clamping seat.

10. A method of using an automated welding device for assembling cryogenic refrigerators, characterized in that, The automated welding apparatus for assembling cryogenic refrigerators according to any one of claims 1-9 comprises the following steps: S1: The sleeve is clamped and fixed by the first clamping mechanism, and at the same time, the two pipes to be welded are fixed by the second clamping mechanism. Then, the two pipes are inserted into the sleeve. S2: After the two pipes are inserted into the sleeve, the sleeve and pipes are welded together by a welding mechanism to connect the pipes and assemble the cryogenic refrigerator.

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