A welding gun for U-shaped dense pipe

Abstract

The present application discloses a welding gun for U-shaped dense tubes, which relates to the field of welding equipment, and includes a fuselage and a machine head. The machine head is arranged at one end of the fuselage, and a receiving cavity is formed in the machine head. The receiving cavity is arranged at an end away from the fuselage, and the U-shaped tube and two straight tubes connected to the U-shaped tube extend from the open end of the receiving cavity into the receiving cavity of the machine head, and the end wall of the machine head away from the fuselage abuts against the outer wall of the heat exchanger chassis, and a welding mechanism is arranged on one side of the machine head located in the receiving cavity, and the welding mechanism welds the plug-in joint of the U-shaped tube and the straight tube. The present application uses the fuselage to drive the machine head to move, and the machine head is arranged on a U-shaped tube and two straight tubes through the receiving cavity cover, so as to weld the plug-in joint of the U-shaped tube and a straight tube, thereby facilitating the welding of the dense tube bundle of the heat exchanger.

Description

Technical Field

[0001] The present application relates to the field of welding equipment, and in particular to a welding gun for a U-shaped dense pipe. Background Art

[0002] Reference Figure 1 The heat exchanger is composed of a chassis 36 and multiple groups of tube bundles, which are sequentially connected and installed in the chassis 36. Each group of tube bundles is composed of a straight tube 37 and a U-shaped tube 38. The straight tube 37 is fixedly installed in the chassis 36, and both ends of the straight tube 37 extend out of the chassis 36. The two ends of each U-shaped tube 38 are respectively plugged into the same end of two adjacent straight tubes 37, and a welding machine is used to weld the plug-in parts of the multiple U-shaped tubes 38 and the straight tubes 37.

[0003] Referring to the Chinese patent with publication number CN114850630B, a U-tube welding machine is disclosed, including a handle, a transmission mechanism, a welding mechanism, a support mechanism and a power mechanism, the welding mechanism including a welding shell, the welding shell is extended with a slot that is the same as the groove in the support mechanism, the slot is connected to the groove, the welding shell is provided with a welding part positioning block, a welding part rotating block, a tungsten needle and a gas outlet block, the welding part rotating block is connected to the transmission shaft, the welding part positioning block and the welding part rotating block are arranged in parallel in the welding shell, the welding part rotating block is positioned, the tungsten needle is arranged at the bottom of the welding shell, and the needle head faces the weld position. In actual use, the welding gun is moved so that the plug-in part of the straight tube and the U-shaped tube enters the slot, the welding mechanism surrounds the plug-in part of one of the straight tubes and the U-shaped tube, and then the welding gun is started, the welding part rotating block rotates, and the tungsten needle is driven to weld the surrounding side of the plug-in part of the straight tube and the U-shaped tube.

[0004] When the tube bundle of the heat exchanger is arranged densely, the spacing between adjacent U-shaped tubes becomes smaller, and it is difficult for the welding mechanism to extend between two adjacent U-shaped tubes, thereby affecting the tube bundle welding. Summary of the invention

[0005] In order to facilitate welding of dense tube bundles of heat exchangers, the present application provides a welding gun for U-shaped dense tubes.

[0006] The present application provides a U-shaped dense pipe welding gun adopts the following technical solution:

[0007] A welding gun for U-shaped dense tubes comprises a body and a head, wherein the head is arranged at one end of the body, a receiving cavity is formed in the head, and the receiving cavity is opened at one end away from the body. The U-shaped tube and two straight tubes connected to the U-shaped tube extend from the open end of the receiving cavity into the receiving cavity of the head, and the end wall of the head away from the body abuts against the outer wall of a heat exchanger case. A welding mechanism is arranged on one side of the head located in the receiving cavity, and the welding mechanism welds the joints between the U-shaped tube and the straight tube.

[0008] By adopting the above technical solution, the machine body is used to drive the machine head to move, and the machine head is set on a U-shaped tube and two straight tubes through the accommodating cavity, and the end of the machine head is abutted against the outer wall of the heat exchanger chassis, and the welding mechanism is used to weld the plug-in joint between the U-shaped tube and a straight tube. After welding, the machine head is moved outward and pulled out, and the machine head is rotated 180°, and the machine head is again covered on the U-shaped tube, and the welding mechanism is used to weld the plug-in joint between the U-shaped tube and another straight tube, so that the welding of the two ends of a U-shaped tube can be completed, and then the above steps are repeated to weld the next U-shaped tube. With such a configuration, when welding the heat exchanger tube bundle, the machine head is moved along the length direction of the straight tube, and the machine head cover is set on the U-shaped tube, so that the plug-in joint between the U-shaped tube and the straight tube can be welded, thereby facilitating the welding of the dense tube bundle of the heat exchanger.

[0009] Preferably, the machine head includes an outer cover, a mounting block and an end ring, the outer cover is arranged on the fuselage, the accommodating cavity is located in the outer cover, the mounting block is arranged in the outer cover, the end ring is arranged at the end of the mounting block away from the fuselage, an inlet groove is formed in the end ring, a accommodating groove connecting the inlet groove and the accommodating cavity is formed in the mounting block, and the welding mechanism is arranged in the mounting block.

[0010] By adopting the above technical solution, when the moving cover of the machine head is arranged on the U-shaped tube, the U-shaped tube first enters the machine head from the inlet groove of the end ring, and then enters the accommodating cavity of the outer cover through the accommodating groove of the mounting block. When the end ring abuts against the heat exchanger chassis, the machine head stops moving. At this time, the joint of the U-shaped tube and the straight tube is located in the accommodating groove of the mounting block and corresponds to the welding mechanism, so that the positioning of the welding point is quickly completed, thereby facilitating the rapid welding of the joint of the U-shaped tube and the straight tube.

[0011] Preferably, the welding mechanism includes a ring gear, a tungsten needle, a limiting ring, a driving member, a transmission gear assembly, two first gears, a transmission rod and a second gear, the limiting ring is fixedly arranged in the mounting block, the ring gear is rotatably arranged in the limiting ring, the limiting ring and the ring gear are both C-shaped, the tungsten needle is arranged in the ring gear, the driving member is arranged in the fuselage, the transmission gear assembly is arranged on the outer cover, the two first gears are rotatably arranged on the outer cover, the driving member drives the two first gears to rotate synchronously through the transmission gear assembly, the two transmission rods are fixedly arranged on the two first gears, the transmission rods are rotatably arranged in the outer cover and the mounting block, the two second gears are rotatably arranged at the ends of the two transmission rods away from the first gears, and the two second gears are meshed with the ring gear.

[0012] By adopting the above technical solution, when the head cover is arranged on the U-shaped tube, the joint between the U-shaped tube and the straight tube is located at the tungsten needle, the driving member drives the two first gears to rotate synchronously through the transmission gear assembly, the first gear drives the second gear to rotate through the transmission rod, the second gear drives the gear ring to rotate on the limit ring, the gear ring drives the tungsten needle to move around the joint between the U-shaped tube and the straight tube, and the tungsten needle welds the joint between the U-shaped tube and the straight tube.

[0013] Preferably, a cooling ring is provided on one side of the mounting block close to the welding mechanism, and a water inlet pipe and a water outlet pipe are provided in the fuselage, and the ends of the water inlet pipe and the water outlet pipe are fixedly connected to the head and tail ends of the cooling ring respectively.

[0014] By adopting the above technical solution, when the welding mechanism is welding, cooling water enters the cooling ring from the water inlet pipe, flows through the cooling ring and cools the welding mechanism, thereby cooling the machine head, and the cooling water after absorbing heat flows out from the water outlet pipe.

[0015] Preferably, an air inlet pipe is arranged in the fuselage, an air inlet hole is opened on the outer cover, the air inlet hole connects the air inlet pipe and the accommodating cavity, and a plurality of exhaust grooves are opened on the side wall of the end ring away from the mounting block.

[0016] By adopting the above technical solution, when the welding mechanism is welding, argon gas is introduced into the air inlet pipe, and the argon gas enters the containing cavity from the air inlet hole and fills the containing cavity. The argon gas serves as a protective gas, which isolates the air and prevents metal oxidation in the welding area, thereby improving the overall quality of the welded joint. The argon gas in the containing cavity is then discharged from the exhaust groove, so that the argon gas can flow in the containing cavity, further improving the protective effect of the argon gas.

[0017] Preferably, the inlet groove is a waist-shaped groove, and the end ring is located at one end of the inner side wall of the inlet groove and is fixedly provided with a limiting arc body, and the limiting arc body is affixed to the outer side wall of a straight tube, and the end ring is located at the other end of the inner side wall of the inlet groove and is provided with a spring pin, and the end of the spring pin abuts against the outer side wall of another straight tube.

[0018] By adopting the above technical solution, when the machine head cover is arranged on the U-shaped tube, the limiting arc is attached to the outer wall of a straight tube, and the end of the spring pin abuts against the outer wall of another straight tube, so that the machine head can be quickly positioned so that the joint between the U-shaped tube and the straight tube is located inside the gear ring.

[0019] Preferably, the outer cover and the mounting block are provided with an observation port on one side of the accommodating groove, and the mounting block is rotatably provided with a side cover in the observation port.

[0020] By adopting the above technical solution, the side cover is rotated to open the observation port, and the staff can observe the pipeline welding condition through the observation port. At the same time, the observation port is convenient for cleaning the welding slag in the machine head.

[0021] The lock member is a pair of locks, each of which has a first end and a second end, and the second end of the lock member is engaged with the first and second ends of the lock member, and the lock member is engaged with the first and second ends of the lock member.

[0022] By adopting the above technical solution, different types of heat exchangers have different lengths of straight tubes extending out of the chassis. When welding the straight tubes and U-shaped tubes, it is necessary to first position the welding mechanism so that when the end ring abuts the side wall of the chassis, the welding mechanism can correspond to the joint between the straight tube and the U-shaped tube. The machine head is first sleeved on the U-shaped tube, and the second elastic member pushes the end ring to move and abut against the side wall of the chassis through the sliding rod. The insertion rod is then inserted into the insertion hole, and the end head is fixed in the insertion hole, so that the limit rod abuts against the outer wall of the U-shaped tube. At this time, the first elastic member is in an elastic compression state, and the machine head is moved toward the side wall of the heat exchanger chassis, and the machine head drives the limit rod to move through the insertion rod. When the limit rod moves to the joint of the straight tube and the U-shaped tube, the first elastic member pushes the limit rod to move, so that the end of the limit rod is inserted into the gap at the joint of the straight tube and the U-shaped tube, so that the machine head cannot continue to move. At this time, the sliding rod is locked using a locking member, so that the position of the end ring can be locked, so that the machine head is sleeved on the U-shaped tube, and when the end head abuts against the side wall of the chassis, the welding mechanism can correspond to the joint of the straight tube and the U-shaped tube, thereby facilitating the welding of the tube bundle.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The accommodating cavity allows the die head to be sleeved on the U-shaped tube. When welding the heat exchanger tube bundle, the die head is moved along the length direction of the straight tube, and the die head cover is set on the U-shaped tube, so that the insertion point of the U-shaped tube and the straight tube can be welded, thereby facilitating the welding of the dense tube bundle of the heat exchanger;

[0025] 2. With the help of the cooling ring, when the welding mechanism is welding, cooling water enters the cooling ring from the water inlet pipe, flows through the cooling ring and cools the welding mechanism, thereby cooling the machine head, and the cooling water after absorbing heat flows out from the water outlet pipe;

[0026] 3. Through the limiting arc and the spring pin, when the machine head cover is arranged on the U-shaped tube, the limiting arc is attached to the outer wall of a straight tube, and the end of the spring pin is abutted against the outer wall of another straight tube, so that the machine head can be quickly positioned so that the joint between the U-shaped tube and the straight tube is located inside the gear ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a heat exchanger in the background technology of this application;

[0028] Figure 2 This is a schematic diagram of the overall structure of the welding gun in Example 1 of the present application;

[0029] Figure 3 This is a forward exploded view of the nose in Example 1 of the present application;

[0030] Figure 4 This is a reverse exploded view of the nose in Example 1 of the present application;

[0031] Figure 5 This is an exploded view of the mounting block in Example 1 of the present application;

[0032] Figure 6 This is a schematic diagram of the structure of the machine head in Example 1 of the present application;

[0033] Figure 7 is a cross-sectional view of the welding gun in Example 1 of the present application;

[0034] Figure 8 It is a side view of the welding gun in Example 1 of the present application;

[0035] Fig. 9 This is a schematic diagram of the side cover in the open state in Example 1 of the present application;

[0036] Fig.10 This is a schematic diagram of the structure of the head in Example 2 of the present application;

[0037] Fig.11 is a cross-sectional view of the convex strip in Example 2 of the present application;

[0038] Fig.12 It is a cross-sectional view of the nose in Example 2 of the present application;

[0039] Fig.13 A cross-sectional view of the insertion rod in Example 2 of the present application;

[0040] Fig.14This is a schematic diagram of the sliding movement of the limiting rod against the U-shaped tube in Example 2 of the present application.

[0041] Figure numerals: 1, fuselage; 2, accommodating chamber; 3, nose; 31, outer cover; 32, mounting block; 33, end ring; 4, welding mechanism; 41, gear ring; 42, tungsten needle; 43, limit ring; 44, driving member; 45, transmission gear assembly; 46, first gear; 47, transmission rod; 48, second gear; 5, inlet groove; 6, accommodating groove; 7, cooling ring; 8, water inlet pipe; 9, water outlet pipe; 10, air inlet pipe; 11, air inlet hole; 12, exhaust groove; 13. Limiting arc; 14. Spring pin; 15. Observation port; 16. Side cover; 17. Insertion hole; 18. End; 19. Insertion rod; 20. Limiting rod; 21. First elastic member; 22. Slide rod; 23. Slide hole; 24. Second elastic member; 25. Locking member; 26. Bellows; 27. Through hole; 28. Raised strip; 29. ​​Annular groove; 34. Storage hole; 36. Chassis; 37. Straight tube; 38. U-shaped tube; 39. Mounting ring; 40. Storage block. DETAILED DESCRIPTION

[0042] The following is combined with Figure 2-14 This application is described in further detail.

[0043] The embodiment of the present application discloses a welding gun for a U-shaped dense pipe.

[0044] Example 1

[0045] Reference Figure 2 and Figure 3 The U-shaped dense pipe welding gun includes a body 1 and a head 3, and the head 3 is installed at one end of the body 1 in the length direction. The head 3 includes an outer cover 31, a mounting block 32 and an end ring 33. The outer cover 31 is fixedly installed at one end of the body 1, and a receiving chamber 2 with an open end is formed in the outer cover 31. The mounting block 32 is fixedly installed at the open end of the receiving chamber 2 of the outer cover 31 by bolts, and the end ring 33 is fixedly installed at the end of the mounting block 32 away from the outer cover 31 by bolts. A receiving groove 6 is formed in the mounting block 32, and an inlet groove 5 is formed in the end ring 33. The receiving groove 6 and the inlet groove 5 are both waist-shaped grooves, and the receiving groove 6 connects the inlet groove 5 and the receiving chamber 2.

[0046] Reference Figure 4 , Figure 5 , Figure 6 and Figure 7A welding mechanism 4 is installed in the mounting block 32, and the welding mechanism 4 includes a ring gear 41, a tungsten needle 42, a limiting ring 43, a driving member 44, a transmission gear assembly 45, two first gears 46, a transmission rod 47 and a second gear 48. The limiting ring 43 and the ring gear 41 are both C-shaped. The limiting ring 43 is fixedly installed in the mounting block 32, and the ring gear 41 is coaxially rotatably installed in the limiting ring 43. A plurality of through holes 27 are opened in the ring gear 41 at equal intervals along its own axial direction, and the tungsten needle 42 is fixedly installed in a through hole 27 of the ring gear 41.

[0047] The driving member 44 is fixedly mounted in the fuselage 1, the transmission gear assembly 45 is mounted on the side wall of the outer cover 31 close to the fuselage 1, the two first gears 46 are rotatably mounted on the side wall of the outer cover 31 close to the fuselage 1, the two second gears 48 are rotatably mounted in the mounting block 32 and mesh with the gear ring 41, and the two transmission rods 47 connect the two first gears 46 and the second gears 48. In the present application, the driving member 44 can be selected as a servo motor.

[0048] The transmission gear assembly 45 is composed of a driving gear, a driven gear and two synchronous gears. The driving gear is fixedly connected to the driving end of the driving member 44, the driven gear is meshed with the driving gear, the two synchronous gears are meshed with the driven gear, and the two synchronous gears are respectively meshed with the two first gears 46. The driving member 44 drives the driving gear to rotate, the driving gear drives the driven gear to rotate, the driven gear drives the two synchronous gears to rotate synchronously, and the two synchronous gears drive the two first gears 46 to rotate synchronously.

[0049] The end of the mounting block 32 away from the end ring 33 is fixedly mounted with a mounting ring 39 by bolts. The transmission rod 47 is composed of two rods and a coupling. One rod is rotatably mounted in the outer cover 31, and the first gear 46 is fixedly mounted at the end of the rod. The other rod is rotatably mounted in the mounting block 32 and the mounting ring 39. The first gear 46 is fixedly mounted at the end of the rod. The coupling is rotatably mounted in the outer cover 31 and connects the two rods. The first gear 46 drives the second gear 48 to rotate through the two rods and the coupling, and the second gear 48 can drive the gear ring 41 to rotate, thereby driving the tungsten needle 42 to rotate.

[0050] When welding the dense tube bundle of the heat exchanger, first insert the two ends of the U-shaped tube 38 into the two straight tubes 37, and then spot weld the joints between the U-shaped tube 38 and the straight tube 37 to achieve the initial fixation of the U-shaped tube 38 and the straight tube 37. The machine head 3 is driven to move by the machine body 1, and the U-shaped tube 38 first enters the machine head 3 from the inlet groove 5 of the end ring 33, and then enters the accommodating cavity 2 of the outer cover 31 through the accommodating groove 6 of the mounting block 32. When the end ring 33 abuts against the heat exchanger chassis 36, the machine head 3 stops moving, and at this time, the joint between the U-shaped tube 38 and the straight tube 37 is located at the tungsten needle 42. The driving member 44 drives the two first gears 46 to rotate synchronously through the transmission gear assembly 45. The first gear 46 drives the second gear 48 to rotate through the transmission rod 47. The second gear 48 drives the ring gear 41 to rotate on the limiting ring 43. The ring gear 41 drives the tungsten needle 42 to rotate around the joint between the U-shaped tube 38 and the straight tube 37. During the rotation of the tungsten needle 42, the joint between the U-shaped tube 38 and the straight tube 37 is welded.

[0051] After the U-shaped tube 38 is welded to a straight tube 37, the machine head 3 is moved away from the heat exchanger chassis 36 and pulled out, and the machine head 3 is rotated 180°, and the machine head 3 is again covered on the U-shaped tube 38, and the welding mechanism 4 is used to weld the plug-in joint between the U-shaped tube 38 and another straight tube 37, so that the welding of the two ends of a U-shaped tube 38 can be completed, and the above steps are repeated to weld the next U-shaped tube 38. In this way, when welding the heat exchanger tube bundle, the machine head 3 is moved along the length direction of the straight tube 37, and the machine head 3 is covered on the U-shaped tube 38, so that the plug-in joint between the U-shaped tube 38 and the straight tube 37 can be welded, thereby facilitating the welding of the dense tube bundle of the heat exchanger.

[0052] Reference Figure 5 , Figure 6 and Figure 7 A C-shaped cooling ring 7 is installed in the mounting block 32, and a cooling flow channel is formed in the cooling ring 7. The end surface of the mounting ring 39 away from the fuselage 1 abuts against the cooling ring 7, thereby positioning the cooling ring 7. The cooling ring 7 and the limiting ring 43 clamp and limit the gear ring 41, so that the rotation of the gear ring 41 is more stable. An inlet pipe 8 and an outlet pipe 9 are installed in the fuselage 1. The end of the inlet pipe 8 passes through the outer cover 31 and the mounting ring 39 and is connected to one end of the cooling ring 7. The end of the outlet pipe 9 passes through the outer cover 31 and the mounting ring 39 and is connected to the other end of the cooling ring 7.

[0053] When the welding mechanism 4 is welding, cooling water enters the cooling ring 7 from the water inlet pipe 8, flows in the cooling channel and cools the welding mechanism 4, thereby cooling the machine head 3, and the cooling water after absorbing heat flows out from the water outlet pipe 9.

[0054] Reference Figure 3 and Figure 8The end ring 33 is located on one side of the inlet groove 5 in the length direction and has an integrally formed limiting arc 13. The end ring 33 is located on the other side of the inlet groove 5 in the length direction and has a spring pin 14 embedded therein. The end of the spring pin 14 extends into the inlet groove 5. When the machine head 3 is covered on the U-shaped tube 38, the limiting arc fits on the outer wall of one straight tube 37, and the end of the spring pin 14 abuts on the outer wall of another straight tube 37, which can quickly position the machine head 3, so that the straight tube 37 to be welded is coaxial with the gear ring 41, thereby making the welding more accurate.

[0055] Reference Figure 3 , Figure 6 , Figure 7 and Figure 8 An air intake pipe 10 is installed in the fuselage 1, and the end of the air intake pipe 10 is connected to the air supply device. A plurality of air intake holes 11 are provided at the end of the outer cover 31 close to the fuselage 1, and a plurality of exhaust grooves 12 are provided on the end wall of the end ring 33 away from the mounting block 32. When welding the tube bundle, the air supply device supplies argon gas into the fuselage 1 through the air intake pipe 10, and the argon gas enters the accommodating cavity 2 of the outer cover 31 from the air intake hole 11. Since the short tube abuts against the chassis 36, the argon gas can fill the accommodating cavity 2. Argon gas, as a protective gas, plays a role in isolating air and preventing metal oxidation in the welding area, thereby improving the overall quality of the welded joint. At the same time, part of the argon gas in the accommodating cavity 2 will be discharged from the exhaust groove 12, so that the argon gas can flow in the accommodating cavity 2, further improving the protective effect of the argon gas.

[0056] Reference Figure 2 and Fig. 9 An observation port 15 is provided on one side of the outer cover 31 and the mounting block 32. The observation port 15 is communicated with the receiving groove 6, and the mounting block 32 is rotatably mounted with a side cover 16 in the observation port 15. The side cover 16 is rotated to open the observation port 15, and the staff can observe the pipeline welding condition through the observation port 15, and at the same time, the observation port 15 is convenient for cleaning the welding slag in the machine head 3.

[0057] The implementation principle of a U-shaped dense tube welding gun in the embodiment of the present application is as follows: when welding the dense tube bundle of the heat exchanger, first insert the two ends of the U-shaped tube 38 into the two straight tubes 37, and then spot weld the plug-in joints of the U-shaped tube 38 and the straight tube 37 to achieve the preliminary fixation of the U-shaped tube 38 and the straight tube 37. The machine head 3 is driven to move by the machine body 1, and the U-shaped tube 38 first enters the machine head 3 from the inlet groove 5 of the end ring 33, and then enters the accommodating cavity 2 of the outer cover 31 through the accommodating groove 6 of the mounting block 32. When the end ring 33 abuts against the heat exchanger chassis 36, the machine head 3 stops moving, and at this time, the plug-in joint of the U-shaped tube 38 and the straight tube 37 is located at the tungsten needle 42. The driving member 44 drives the two first gears 46 to rotate synchronously through the transmission gear assembly 45, the first gear 46 drives the second gear 48 to rotate through the transmission rod 47, the second gear 48 drives the gear ring 41 to rotate on the limit ring 43, the gear ring 41 drives the tungsten needle 42 to rotate around the plug-in joint of the U-shaped tube 38 and the straight tube 37, and the tungsten needle 42 welds the plug-in joint of the U-shaped tube 38 and the straight tube 37 during the rotation process. After the U-shaped tube 38 and a straight tube 37 are welded, the machine head 3 is moved away from the heat exchanger chassis 36 and pulled out, and the machine head 3 is rotated 180°, and the machine head 3 is covered on the U-shaped tube 38 again, and the welding mechanism 4 is used to weld the plug-in joint of the U-shaped tube 38 and another straight tube 37, so that the welding of the two ends of a U-shaped tube 38 can be completed, and the above steps are repeated to weld the next U-shaped tube 38. In this way, when welding the heat exchanger tube bundle, the machine head 3 is moved along the length direction of the straight tube 37, and the machine head 3 is covered on the U-shaped tube 38, so that the joint between the U-shaped tube 38 and the straight tube 37 can be welded, thereby facilitating the welding of the dense tube bundle of the heat exchanger.

[0058] Example 2

[0059] Reference Fig.10 and Fig.11 The difference between this embodiment and the first embodiment is that the end ring 33 is slidably mounted on the mounting block 32 along the length direction of the machine head 3, four slide bars 22 are fixedly mounted on the outer wall of the end ring 33, and four convex strips 28 are integrally formed on the outer wall of the outer cover 31. Each convex strip 28 has a slide hole 23 along its own length direction in the inner side of the end ring 33, and the four slide bars 22 are slidably mounted in the four slide holes 23 respectively. The convex strip 28 is located in each slide hole 23 and a second elastic member 24 is installed. The end of the second elastic member 24 abuts against the end of the slide bar 22 away from the end ring 33. In the present application, the second elastic member 24 can be selected as a spring. The second elastic member 24 can push the end ring 33 to slide in the direction away from the mounting block 32 through the slide bar 22.

[0060] The outer wall of the convex strip 28 is threadedly mounted with a locking piece 25, and the ends of the four locking pieces 25 respectively abut against the outer walls of the four slide bars 22. In the present application, the locking piece 25 can be selected as a hand-tightened bolt, and the slide bar 22 can be locked by rotating the locking piece 25. A bellows 26 is fixedly mounted on the side wall of the end ring 33 close to the mounting block 32, and one end of the bellows 26 away from the end ring 33 is fixedly connected to the side wall of the mounting block 32.

[0061] Reference Fig.12 , Fig.13 and Fig.14 , a socket 17 is obliquely provided in the outer cover 31 and the mounting block 32, the top of the socket 17 is a threaded hole, and a terminal 18 is detachably installed in the threaded hole at the top of the socket 17, and a plug rod 19 is fixedly installed at the bottom end of the terminal 18, the plug rod 19 is located in the socket 17, and the bottom end of the plug rod 19 extends into the accommodating groove 6. A limit rod 20 is slidably installed in the bottom end of the plug rod 19 along its own length direction, and a first elastic member 21 is installed in the plug rod 19, the bottom end of the first elastic member 21 abuts against the top end of the limit rod 20, and along the width direction of the machine head 3, the limit rod 20 and the tungsten needle 42 are located in the same plane. In the present application, the first elastic member 21 can be selected as a spring, and the first elastic member 21 can push the limit rod 20 to move away from the plug rod 19.

[0062] Different models of heat exchangers have different lengths of straight tubes 37 extending out of the chassis 36. When welding the straight tube 37 and the U-shaped tube 38, it is necessary to first locate the position of the tungsten needle 42 so that when the end ring 33 abuts the side wall of the chassis 36, the tungsten needle 42 can correspond to the joint between the straight tube 37 and the U-shaped tube 38.

[0063] First, the machine head 3 is sleeved on the U-shaped tube 38, and the second elastic member 24 pushes the end ring 33 to move away from the mounting block 32 through the slide rod 22, and the end ring 33 moves to abut the side wall of the chassis 36. Then, the insertion rod 19 is inserted into the insertion hole 17, and the rotating end head 18 is fixed in the insertion hole 17. At this time, the bottom end of the limit rod 20 abuts against the outer wall of the U-shaped tube 38, and the abutment point is point D, and the first elastic member 21 is in an elastically compressed state.

[0064] An annular groove 29 is formed at the joint of the U-shaped tube 38 and the straight tube 37. The head 3 is moved toward the side wall of the heat exchanger case 36, and the head 3 drives the limit rod 20 to move through the insertion rod 19. The limit rod 20 moves from the abutment point D toward the annular groove 29. When the abutment point of the limit rod 20 moves into the annular groove 29, the first elastic member 21 pushes the limit rod 20 to move, so that the end of the limit rod 20 is inserted into the annular groove 29.

[0065] At this time, the limit rod 20 limits the movement of the machine head 3, and the tungsten needle 42 is located at the insertion point of the U-shaped tube 38 and the straight tube 37. The locking member 25 is rotated to lock the slide bar 22, and the position of the end ring 33 can be locked, so that the machine head 3 is sleeved on the U-shaped tube 38, and when the end head 18 abuts against the side wall of the chassis 36, the tungsten needle 42 can correspond to the insertion point of the straight tube 37 and the U-shaped tube 38, so as to facilitate the welding of different types of heat exchanger tube bundles.

[0066] Reference Fig.10 and Fig.12 A receiving block 40 is integrally formed on the outer wall of the outer cover 31, and a receiving hole 34 is formed at the top of the receiving block 40. The top of the receiving hole 34 is a threaded hole. After the locking member 25 is rotated to lock the slide bar 22, the end head 18 is rotated to remove the insertion rod 19 from the insertion hole 17, and then the end head 18 is rotated to insert the insertion rod 19 into the receiving hole 34, so that the insertion rod 19 can be stored.

[0067] The implementation principle of Example 2 is as follows: first, the machine head 3 is sleeved on the U-shaped tube 38, and the second elastic member 24 pushes the end ring 33 to move away from the mounting block 32 through the slide rod 22, and the end ring 33 moves to abut the side wall of the chassis 36. Then, the insertion rod 19 is inserted into the insertion hole 17, and the rotating end head 18 is fixed in the insertion hole 17. At this time, the bottom end of the limit rod 20 abuts against the outer wall of the U-shaped tube 38, and the abutment point is point D, and the first elastic member 21 is in an elastic compression state. An annular groove 29 is formed at the insertion point of the U-shaped tube 38 and the straight tube 37. When the machine head 3 is moved toward the side wall of the heat exchanger chassis 36, the machine head 3 drives the limit rod 20 to move through the insertion rod 19. The limiting rod 20 moves from the contact point D toward the annular groove 29. When the contact point of the limiting rod 20 moves into the annular groove 29, the first elastic member 21 pushes the limiting rod 20 to move, so that the end of the limiting rod 20 is inserted into the annular groove 29. At this time, the limiting rod 20 limits the movement of the machine head 3, and the tungsten needle 42 is located at the insertion point of the U-shaped tube 38 and the straight tube 37. The locking member 25 is rotated to lock the slide bar 22, and the position of the end ring 33 can be locked, so that the machine head 3 is sleeved on the U-shaped tube 38, and when the end head 18 abuts against the side wall of the chassis 36, the tungsten needle 42 can correspond to the insertion point of the straight tube 37 and the U-shaped tube 38, so as to facilitate the welding of different types of heat exchanger tube bundles.

[0068] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A U-shaped dense pipe welding gun, comprising a body (1) and a head (3), wherein the head (3) is arranged at one end of the body (1), characterized in that: A receiving chamber (2) is formed in the machine head (3), and the receiving chamber (2) is open at one end away from the machine body (1). A U-shaped tube (38) and two straight tubes (37) connected to the U-shaped tube (38) extend from the open end of the receiving chamber (2) into the receiving chamber (2) of the machine head (3), and an end wall of the machine head (3) away from the machine body (1) abuts against an outer wall of a heat exchanger case (36). A welding mechanism (4) is provided on one side of the machine head (3) located in the receiving chamber (2), and the welding mechanism (4) welds the insertion joint of the U-shaped tube (38) and the straight tube (37). The machine head (3) comprises an outer cover (31), a mounting block (32) and an end ring (33); the outer cover (31) is arranged on the machine body (1); the accommodating cavity (2) is located in the outer cover (31); the mounting block (32) is arranged in the outer cover (31); the end ring (33) is arranged at an end of the mounting block (32) away from the machine body (1); an inlet groove (5) is formed in the end ring (33); a accommodating groove (6) communicating with the inlet groove (5) and the accommodating cavity (2) is formed in the mounting block (32); and the welding mechanism (4) is arranged in the mounting block (32); The welding mechanism (4) comprises a gear ring (41), a tungsten needle (42), a limiting ring (43), a driving member (44), a transmission gear assembly (45), two first gears (46), a transmission rod (47) and a second gear (48), wherein the limiting ring (43) is fixedly arranged in the mounting block (32), the gear ring (41) is rotatably arranged in the limiting ring (43), the limiting ring (43) and the gear ring (41) are both C-shaped, the tungsten needle (42) is arranged in the gear ring (41), the driving member (44) is arranged in the fuselage (1), and the transmission gear assembly (45) is The two first gears (46) are rotatably arranged on the outer cover (31); the driving member (44) drives the two first gears (46) to rotate synchronously through a transmission gear assembly (45); the two transmission rods (47) are fixedly arranged on the two first gears (46); the transmission rods (47) are rotatably arranged in the outer cover (31) and the mounting block (32); the two second gears (48) are rotatably arranged at the ends of the two transmission rods (47) away from the first gears (46), and the two second gears (48) are meshed with the ring gear (41).

2. A U-shaped dense pipe welding gun according to claim 1, characterized in that: A cooling ring (7) is arranged on one side of the mounting block (32) close to the welding mechanism (4), and a water inlet pipe (8) and a water outlet pipe (9) are arranged in the fuselage (1), and the ends of the water inlet pipe (8) and the water outlet pipe (9) are respectively fixedly connected to the head and tail ends of the cooling ring (7).

3. A U-shaped dense pipe welding gun according to claim 1, characterized in that: An air intake pipe (10) is arranged in the fuselage (1), an air intake hole (11) is provided on the outer cover (31), the air intake hole (11) is connected to the air intake pipe (10) and the accommodating chamber (2), and a plurality of exhaust grooves (12) are provided on the side wall of the end ring (33) away from the mounting block (32).

4. A U-shaped dense pipe welding gun according to claim 1, characterized in that: The inlet groove (5) is a waist-shaped groove. A limiting arc (13) is fixedly arranged on the inner wall of the inlet groove (5) near one end of the end ring (33). The limiting arc (13) is fitted on the outer wall of a straight tube (37). A spring pin (14) is arranged on the inner wall of the inlet groove (5) near the other end of the end ring (33). The end of the spring pin (14) abuts against the outer wall of another straight tube (37).

5. A U-shaped dense pipe welding gun according to claim 1, characterized in that: An observation port (15) is provided on one side of the outer cover (31) and the mounting block (32) close to the receiving groove (6), and a side cover (16) is rotatably provided on the mounting block (32) located in the observation port (15).

6. A U-shaped dense pipe welding gun according to claim 1, characterized in that: The outer cover (31) and the mounting block (32) are provided with a plug hole (17), the plug hole (17) is detachably provided with an end head (18) through an internal thread, a plug rod (19) is fixedly provided on one side of the end head (18) close to the inside of the mounting block (32), the plug rod (19) passes through the plug hole (17) and extends into the receiving groove (6), a limit rod (20) is provided at the end of the plug rod (19) away from the end head (18) and slides along its own length direction, a first elastic member (21) is provided in the plug rod (19) for pushing the limit rod (20) to move in a direction away from the plug rod (19), and the end of the limit rod (20) abuts against the outer wall of the U-shaped tube (38); a plurality of sliding rods (22) are provided on the outer wall of the end ring (33) ), a plurality of convex strips (28) are arranged on the outer wall of the outer cover (31), a sliding hole (23) is opened in the convex strips (28), and a plurality of the sliding rods (22) are respectively slidably arranged in the plurality of sliding holes (23), and a second elastic member (24) is arranged in the sliding hole (23) for pushing the sliding rod (22) to move away from the mounting block (32), and a locking member (25) is arranged on the convex strip (28), and the end of the locking member (25) abuts against the sliding rod (22) and is used to lock the sliding rod (22), and a bellows (26) is arranged between the end ring (33) and the mounting block (32), and the two ends of the bellows (26) are respectively fixedly connected to the end ring (33) and the mounting block (32).

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