A welding and positioning tool for air conditioning refrigeration pipes

Abstract

The present invention relates to the field of welding processing technology, and discloses an air conditioning refrigeration pipe welding positioning tool, the air conditioning refrigeration pipe welding positioning tool, comprising a first feeding part, the first feeding part comprises a fixed machine base and a slide rail, the upper surface of the fixed machine base is provided with a placement hole, and a fixing component is arranged along the circumferential outer diameter of the placement hole; the second feeding part, the second feeding part comprises a slidable machine base, the interior of the slidable machine base is fixedly connected with a placement tube that coincides with the central axis of the placement hole, a clamping piece is arranged on the circumferential outer surface of the placement tube, and a limit assembly is arranged on the lower surface of the slidable machine base for preventing the flat pipe in the placement tube from falling. The advantage of the present invention is that it ensures that the central axes of the flat pipe and the expanded pipe always coincide during the welding process, improves the welding quality, and at the same time, avoids the shaking of the flat pipe during the welding process, thereby causing the problem of unstable welding pool and poor weld formation.

Description

Technical Field

[0001] The invention relates to the technical field of welding processing, and in particular to a welding positioning tool for air-conditioning refrigeration pipes. Background Art

[0002] With the progress of society, various household appliances have improved people's quality of life, such as air conditioners. When installing or repairing the outdoor unit of the air conditioner, workers need to weld and extend the refrigeration pipe connecting the indoor unit and the outdoor unit of the air conditioner according to actual needs. Before welding, workers manually plug the two pipes together, and then use high temperature to melt the solder to the gap between the two pipes. After the solder is completely cooled and solidified, the pipes are welded.

[0003] There are two traditional welding methods, namely vertical welding and horizontal welding. In the horizontal welding process, under the action of gravity, the melted solder tends to gather downward, which will affect the overall welding and cause a cold weld. Therefore, in order to better ensure the welding performance, vertical welding is usually adopted. In the vertical welding process, the expanded pipe is first fixed with a clamp. The worker holds the flat pipe and inserts it into the expanded pipe while holding the welding gun to weld it. During the welding process, the flat pipe and the expanded pipe cannot always keep the central axis coincident. At the same time, during the welding process, the flat pipe is prone to shaking, which leads to unstable welding pool and poor weld formation, such as undercut, weld nodule, incomplete penetration, pores, slag inclusions and other welding defects. Summary of the invention

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an air-conditioning refrigeration pipe welding positioning tool, which can effectively solve the problem in the prior art that during the welding process, the flat-end pipe and the expanded pipe cannot always keep the central axis coincident, and at the same time, the flat-end pipe is prone to shaking during the welding process, which leads to unstable welding molten pool and poor weld formation, such as undercut, weld nodule, incomplete penetration, air holes, slag inclusion and other welding defects.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The present invention provides an air-conditioning refrigeration pipe welding positioning tool, comprising:

[0009] A first loading part, the first loading part comprises a fixed machine base and a slide rail located above the fixed machine base, a placement hole for accommodating the expanded pipe is opened on the upper surface of the fixed machine base, and a fixed component for wrapping the expanded pipe in the placement hole is arranged along the circumferential outer diameter of the placement hole;

[0010] A second loading part, the second loading part comprises a slidable machine base sliding with the inner side of the slide rail, the slidable machine base is arranged directly above the fixed component, the interior of the slidable machine base is fixedly connected with a placement tube coinciding with the central axis of the placement hole, the circumferential outer surface of the placement tube is provided with a clamping piece for clamping a flat-end pipe, and the lower surface of the slidable machine base is provided with a limit assembly for preventing the flat-end pipe in the placement tube from falling off;

[0011] Among them, the clamping member includes a clamping block that slides with the inside of the placement tube, and the clamping blocks are provided with two and are symmetrically distributed with the placement tube as the center. A linkage that rotates with the upper surface of the sliding base is provided below the clamping block, and a push block that can be used to adjust the position of the clamping block is slidably connected inside the edge plate of the sliding base.

[0012] Furthermore, the fixing assembly includes a first fixing ring and a second fixing ring horizontally arranged with the first fixing ring, the first fixing ring is connected to the lower surface of the second fixing ring via a telescopic rod arranged on its upper surface, and a compression spring connected to the lower surface of the second fixing ring is sleeved on the circumferential outer side of the telescopic rod.

[0013] Furthermore, the limit assembly includes a first limit rod and a first limit block, the end of the first limit rod away from the slide rail is fixedly connected to the outer surface of the first limit block, the first limit block is located directly below the lower pipe opening of the placement tube, and the lower surface of the sliding base is provided with a movable part for the first limit rod to slide.

[0014] Furthermore, the limiting assembly also includes a second limiting member and a second limiting block, the second limiting member is fixedly connected to the outer surface of the second limiting block through an L-shaped rod, the second limiting block is provided with two and symmetrically distributed with the first limiting block as the center, and the side of the second limiting member away from the second limiting block is connected to the gear that is transmitted to the side of the first limiting rod through tooth meshing.

[0015] Furthermore, a limit block is provided at one end of the first limit rod away from the first limit block, and a sliding groove that fits with the roller rod inside the limit block is opened on the side of the slide rail close to the slidable machine base, and the upper and lower ends of the sliding groove are designed with large arc edges.

[0016] Furthermore, the linkage includes a first linkage member and a second linkage member fixedly connected to the first linkage member, the end of the first linkage member is rotatably connected to the lower surface of the clamping block through a rotating shaft, the end of the first linkage member away from the clamping block is rotatably connected to the upper surface of the sliding base, the second linkage member is provided with two and is symmetrically distributed with the placement tube as the center, and the adjacent ends of a pair of the second linkage members are connected by tooth meshing.

[0017] Furthermore, the push block is fixedly connected to the end face of the clamping block by a connecting rod arranged at its outer end, and the side of the connecting rod is provided with a spring sheet connected to the edge plate surface of the slidable machine base, the slide rail is connected to a return spring through a blocking block arranged on its outer surface, and a moving block that fits with the lower surface of the push block is installed on the top of the return spring, and the side of the slide rail close to the slidable machine base is slidably connected to the side of the moving block through a track, and in the initial state, the moving block is located at the upper end of the sliding groove.

[0018] Furthermore, the upper surface of the second limit block and the upper surface of the second limit piece are located in the same horizontal plane, and the central axis of the space surrounded by the first limit block and the two second limit blocks coincides with the central axis of the placement tube, the first fixing ring, the second fixing ring and the placement hole. Beneficial Effects

[0019] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0020] The present invention is provided with a first loading part, which includes a fixed machine base, a slide rail and a placement hole. In the prior art, workers need to hold the expanded pipe to be welded during welding, while in the present invention, the expanded pipe is always placed in the placement hole and fixed by the fixed machine base, so that workers do not need to use other tools to fix the expanded pipe during welding.

[0021] The present invention is provided with a first feeding part, the first feeding part includes a fixing component, the fixing component includes a first fixing ring and a second fixing ring horizontally arranged with the first fixing ring, the first fixing ring is connected with the lower surface of the second fixing ring by a telescopic rod arranged on its upper surface, and a compression spring connected with the lower surface of the second fixing ring is sleeved on the circumferential outer side of the telescopic rod. In this way, when the worker is feeding the expanded pipe, he only needs to apply downward pressure to the second fixing ring so that the second fixing ring moves downward in the direction close to the first fixing ring, at which time the telescopic rod contracts and the compression spring is compressed; after the force applied to the second fixing ring disappears, the telescopic rod is stretched upward by the rebound force of the compression spring, thereby driving the second fixing ring to return to its initial state, and the expansion pipe is restricted by the first fixing ring and the second fixing ring, so as to further prevent the expansion pipe in the placement hole from shaking.

[0022] The present invention is provided with a second loading part, which includes a slidable machine base that slides with the inner side of the slide rail, and the slidable machine base is arranged directly above the fixed component. The interior of the slidable machine base is fixedly connected with a placement tube that coincides with the central axis of the placement hole, so that the flat-mouthed pipe in the placement tube and the expanded pipe in the placement hole after loading remain coaxial. The slidable machine base slides downward toward the fixed component through the slide rail, so that the end of the flat-mouthed pipe in the placement tube that needs to be welded is plugged into the end of the expanded pipe in the placement hole that needs to be welded. In this way, the coaxiality of the flat-mouthed pipe and the expanded pipe is guaranteed during the plug-in process, so that the welds of the flat-mouthed pipe and the expanded pipe are neat and uniform, thereby ensuring the welding quality.

[0023] The present invention is provided with a clamping piece, which is arranged on the circumferential outer surface of the placement tube. The clamping piece is used to clamp the flat-end pipe in the placement tube. The clamping piece includes a clamping block and a linkage. Two clamping blocks are provided and are symmetrical with the placement tube as the center so that the flat-end pipe in the placement tube is fixed, and the two clamping blocks are provided with soft materials such as felt, sponge or silicone on the end faces of one side close to each other to prevent the flat-end pipe from being broken due to excessive force when the two clamping blocks clamp the flat-end pipe in the placement tube; the linkage is arranged below the two clamping blocks and can rotate with the upper surface of the sliding machine base. Through the linkage action of the linkage, the two clamping blocks can move synchronously, thereby ensuring that the flat-end pipe clamped by the two clamping blocks always remains coaxial with the expanded pipe in the placement hole.

[0024] The present invention is provided with a limit assembly, which is arranged on the lower surface of the slidable machine base. The limit assembly can be used to prevent the flat-end pipe in the placement tube from falling, so that when the slidable machine base slides downward close to the fixed machine base, the flat-end pipe in the placement tube will not fall freely but fall directly.

[0025] The present invention is provided with a limit block, which is located at one end of the first limit rod away from the first limit block, and a sliding groove that fits with the roller rod inside the limit block is opened on the side of the slide rail close to the sliding base. In this way, as the sliding base falls along the slide rail, the first limit rod drives the first limit block to move toward the axial direction close to the placement tube, and there is no need to manually move the first limit rod, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A three-dimensional schematic diagram of an embodiment of the present invention from one viewing angle;

[0028] Figure 2 A three-dimensional schematic diagram of another viewing angle of an embodiment of the present invention;

[0029] Figure 3 For the embodiment of the present invention Figure 2 A schematic diagram of the structure with a partial enlargement at the center;

[0030] Figure 4 A top view of an embodiment of the present invention;

[0031] Figure 5 is a three-dimensional schematic diagram of the second feeding part according to an embodiment of the present invention;

[0032] Figure 6 This is a structural separation diagram of the second feeding part according to an embodiment of the present invention;

[0033] Figure 7 is a three-dimensional schematic diagram of the limiting assembly according to an embodiment of the present invention;

[0034] Figure 8 This is a structural separation diagram of the fixing component according to an embodiment of the present invention.

[0035] The numbers in the figure represent respectively: 1. first feeding part; 11. fixed base; 12. slide rail; 13. placement hole; 14. fixed assembly; 141. first fixed ring; 142. second fixed ring; 143. telescopic rod; 144. compression spring; 2. second feeding part; 21. slidable base; 22. placement tube; 23. clamping member; 231. clamping block; 232. linkage; 2321. first linkage member; 2322. second linkage member; 233. push block; 234. connecting rod; 24. limiting assembly; 241. first limiting rod; 242. first limiting block; 243. moving member; 244. second limiting member; 245. second limiting block; 246. gear; 247. limiting block; 25. sliding groove; 26. spring; 27. blocking block; 28. reset spring; 29. ​​moving block. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] The present invention will be further described below in conjunction with the embodiments. Example

[0038] See also Figure 1-Figure 8 The present invention provides a technical solution: an air-conditioning refrigeration pipe welding positioning tool, comprising:

[0039] A first loading part 1, comprising a fixed machine base 11 and a slide rail 12 located above the fixed machine base 11, a placement hole 13 for accommodating the expanded pipe is provided on the upper surface of the fixed machine base 11, and a fixing component 14 for wrapping the expanded pipe in the placement hole 13 is provided along the circumferential outer diameter of the placement hole 13;

[0040] A second loading part 2, the second loading part 2 comprises a slidable machine base 21 which slides with the inner side of the slide rail 12, the slidable machine base 21 is arranged directly above the fixing assembly 14, the interior of the slidable machine base 21 is fixedly connected with a placement tube 22 which coincides with the central axis of the placement hole 13, the circumferential outer surface of the placement tube 22 is provided with a clamping member 23 which can be used to clamp a flat-end pipe, and the lower surface of the slidable machine base 21 is provided with a limit assembly 24 which is used to prevent the flat-end pipe in the placement tube 22 from falling;

[0041] Among them, the clamping member 23 includes a clamping block 231 that slides with the inside of the placement tube 22. The clamping block 231 is provided with two and is symmetrically distributed with the placement tube 22 as the center. A linkage 232 that rotates with the upper surface of the sliding base 21 is provided below the clamping block 231. The edge plate of the sliding base 21 is slidably connected inside with a push block 233 that can be used to adjust the position of the clamping block 231.

[0042] The fixing assembly 14 includes a first fixing ring 141 and a second fixing ring 142 horizontally arranged with the first fixing ring 141. The first fixing ring 141 is connected to the lower surface of the second fixing ring 142 via a telescopic rod 143 arranged on its upper surface. A compression spring 144 connected to the lower surface of the second fixing ring 142 is sleeved on the circumferential outer side of the telescopic rod 143.

[0043] The limiting assembly 24 includes a first limiting rod 241 and a first limiting block 242. The end of the first limiting rod 241 away from the slide rail 12 is fixedly connected to the outer surface of the first limiting block 242. The first limiting block 242 is located directly below the lower tube opening of the placement tube 22. The lower surface of the slidable base 21 is provided with a moving part 243 for the first limiting rod 241 to slide.

[0044] The limiting assembly 24 also includes a second limiting member 244 and a second limiting block 245. The second limiting member 244 is fixedly connected to the outer surface of the second limiting block 245 through an L-shaped rod. The second limiting block 245 is provided with two and is symmetrically distributed with the first limiting block 242 as the center. The side of the second limiting member 244 away from the second limiting block 245 is connected to the gear 246 which is transmitted to the side of the first limiting rod 241 through tooth meshing.

[0045] A limit block 247 is provided at one end of the first limit rod 241 away from the first limit block 242, and a sliding groove 25 that fits with the internal roller of the limit block 247 is opened on the side of the slide rail 12 close to the slidable machine base 21, and the upper and lower ends of the sliding groove 25 are designed with large arc edges.

[0046] The linkage 232 includes a first linkage member 2321 and a second linkage member 2322 fixedly connected to the first linkage member 2321, the end of the first linkage member 2321 is rotatably connected to the lower surface of the clamping block 231 through a rotating shaft, the end of the first linkage member 2321 away from the clamping block 231 is rotatably connected to the upper surface of the sliding base 21, and the second linkage member 2322 is provided with two and is symmetrically distributed with the placement tube 22 as the center, and the adjacent ends of a pair of the second linkage members 2322 are connected by tooth meshing.

[0047] The push block 233 is fixedly connected to the end face of the clamping block 231 by a connecting rod 234 arranged at its outer end, and a spring 26 connected to the edge plate surface of the slidable base 21 is arranged on the side of the connecting rod 234, and the slide rail 12 is connected to a return spring 28 through a blocking block 27 arranged on its outer surface, and a moving block 29 that fits with the lower surface of the push block 233 is installed on the top of the return spring 28, and the side of the slide rail 12 close to the slidable base 21 is slidably connected to the side of the moving block 29 through a track, and in the initial state, the moving block 29 is located at the upper end of the sliding groove 25.

[0048] The upper surface of the second limit block 245 and the upper surface of the second limit piece 244 are located in the same horizontal plane, and the central axis of the space surrounded by the first limit block 242 and the two second limit blocks 245 coincides with the central axis of the placement tube 22, the first fixing ring 141, the second fixing ring 142 and the placement hole 13.

[0049] Feeding process of expanded and flat tubes:

[0050] The worker places the flat-end pipe to be welded into the placement tube 22 from top to bottom, so that the flat-end pipe falls downward under the action of gravity until the end of the flat-end pipe to be welded abuts against the first limit block 242 and the second limit block 245 .

[0051] The slidable base 21 moves downward along the slide rail 12 toward the fixed base 11 until the lower surface of the push block 233 is in contact with the lower surface of the moving block 29. As the slidable base 21 continues to move downward, the moving block 29 continues to move downward under the thrust of the push block 233, thereby driving the return spring 28 to be compressed, and the push block 233 drives the clamping block 231 to move toward the central axis of the placement tube 22 through the connecting rod 234. The first linkage 2321 is then driven by the clamping block 231 to rotate, so that the two second linkages 2322 rotate at a certain angle, and finally drive the other clamping block 231 to move toward the central axis of the placement tube 22, thereby clamping the wall of the flat-end pipe in the placement tube 22.

[0052] In this way, since the linkage 232 drives the two clamping blocks 231 to move the same distance, when the two clamping blocks 231 clamp the flat-end pipe in the placement tube 22, the flat-end pipe always remains coincident with the axis of the placement tube 22 without being offset, thereby ensuring coaxiality.

[0053] It is worth mentioning that the two clamping blocks 231 are provided with soft materials such as felt, sponge or silicone at one end face close to the flat-end pipe to prevent the flat-end pipe from breaking due to excessive clamping force when the two clamping blocks 231 clamp the pipe wall of the flat-end pipe in the placement tube 22.

[0054] Furthermore, the worker applies downward pressure to the second fixed ring 142, so that the second fixed ring 142 moves downward toward the first fixed ring 141, thereby driving the telescopic rod 143 located between the first fixed ring 141 and the second fixed ring 142 to contract. At this time, the compression spring 144 arranged on the outer side of the circumference of the telescopic rod 143 is compressed by the downward pressure.

[0055] The worker places the expanded pipe to be welded from the second fixing ring 142 into the placement hole 13, and then releases the pressure applied to the second fixing ring 142, and the elastic potential energy of the compression spring 144 begins to be released and rebounds, thereby driving the telescopic rod 143 to change from a contracted state to an extended state, so that the second fixing ring 142 moves upward in a direction away from the first fixing ring 141. In this way, through the fixing effect of the first fixing ring 141 and the second fixing ring 142, the expanded pipe in the placement hole 13 is fixed without deviation, and the coaxiality is further ensured.

[0056] Welding process of expanded pipe and flat pipe:

[0057] The slidable machine base 21 moves downward along the slide rail 12 toward the direction close to the fixed machine base 11, and when the limit block 247 moves into the sliding groove 25, the first limit rod 241 drives the first limit block 242 to move in the direction away from the axis of the placement tube 22 through the resilience of the tension spring arranged between the second limit member 244 and the slidable machine base 21. At the same time, the two second limit blocks 245 both move in the direction away from the axis of the placement tube 22. In this way, the flat pipe abutting against the first limit block 242 and the two second limit blocks 245 is no longer restricted and falls downward. Since the placement tube 22 and the placement hole 13 are coaxial, the end of the flat pipe to be welded in the placement tube 22 just falls and is plugged into the end of the expanded pipe to be welded in the placement hole 13. At this time, the flat pipe and the flared pipe always remain coaxial. The worker aims the welding gun and solder at the joint of the flat pipe and the flared pipe for welding. The high temperature of the welding gun melts the solder, and the melted solder flows to the joint gap between the flat pipe and the flared pipe. After the solder solidifies and cools, the welding process ends.

[0058] Cutting process of expanded pipe and flat pipe after welding:

[0059] After the solder flowing to the joint gap between the flat pipe and the expanded pipe solidifies and cools, the flat pipe and the expanded pipe are welded. The slidable machine base 21 slides through the slide rail 12 until the end of the flat pipe away from the welding end face is located between the first limit block 242 and the two second limit blocks 245. Then, after the limit block 247 moves out of the sliding groove 25, the first limit block 242 moves toward the direction close to the axis of the placement tube 22. At the same time, the gear 246 is rotated by the first limit rod 241, thereby driving the two second limit blocks 245 to also move toward the direction close to the axis of the placement tube 22. In this way, the end of the flat pipe away from the welding end face is clamped by the first limit block 242 and the two second limit blocks 245. As the slidable machine base 21 continues to move in the direction away from the fixed machine base 11, the expanded pipe welded and fixed to the flat pipe is completely separated from the first fixed ring 141 and the second fixed ring 142. The worker further takes out the flat pipe from the first fixing ring 141 and the second fixing ring 142, thereby completing the cutting of the flat pipe and the expanded pipe after welding.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioning refrigeration pipe welding positioning tool, characterized in that: include: A first loading part (1), the first loading part (1) comprising a fixed machine base (11) and a slide rail (12) located above the fixed machine base (11), a placement hole (13) for accommodating the expanded pipe being provided on the upper surface of the fixed machine base (11), and a fixing component (14) for wrapping the expanded pipe in the placement hole (13) being provided along the circumferential outer diameter of the placement hole (13); A second loading part (2), the second loading part (2) comprising a slidable machine base (21) that slides with the inner side of the slide rail (12), the slidable machine base (21) being arranged directly above the fixed component (14), the interior of the slidable machine base (21) being fixedly connected to a placement tube (22) that coincides with the central axis of the placement hole (13), the circumferential outer surface of the placement tube (22) being provided with a clamping member (23) that can be used to clamp a flat-end pipe, and the lower surface of the slidable machine base (21) being provided with a limit assembly (24) that is used to prevent the flat-end pipe in the placement tube (22) from falling off; The clamping member (23) comprises a clamping block (231) that slides with the inside of the placement tube (22); two clamping blocks (231) are provided and are symmetrically distributed with the placement tube (22) as the center; a linkage (232) that rotates with the upper surface of the slidable base (21) is provided below the clamping block (231); a push block (233) that can be used to adjust the position of the clamping block (231) is slidably connected inside the edge plate of the slidable base (21); The fixing assembly (14) comprises a first fixing ring (141) and a second fixing ring (142) arranged horizontally with the first fixing ring (141); the first fixing ring (141) is connected to the lower surface of the second fixing ring (142) via a telescopic rod (143) arranged on its upper surface; a compression spring (144) connected to the lower surface of the second fixing ring (142) is sleeved on the outer circumference of the telescopic rod (143); the limiting assembly (24) comprises a first limiting rod (241) and a first limiting block (242); an end of the first limiting rod (241) away from the slide rail (12) is fixedly connected to the outer surface of the first limiting block (242); the first limiting block (242) is located directly below the lower tube opening of the placement tube (22); a moving part (243) for sliding the first limiting rod (241) is provided on the lower surface of the slidable base (21); the limiting assembly (24) comprises a first limiting rod (241) and a first limiting block (242); an end of the first limiting rod (241) away from the slide rail (12) is fixedly connected to the outer surface of the first limiting block (242); the first limiting block (242) is located directly below the lower tube opening of the placement tube (22); a moving part (243) for sliding the first limiting rod (241) is provided on the lower surface of the slidable base (21); 24) further comprises a second limiting member (244) and a second limiting block (245), wherein the second limiting member (244) is fixedly connected to the outer surface of the second limiting block (245) via an L-shaped rod, the upper surface of the second limiting block (245) and the upper surface of the second limiting member (244) are located in the same horizontal plane, the second limiting blocks (245) are provided with two and are symmetrically distributed with the first limiting block (242) as the center, and the second limiting member (244) is away from the first limiting block (242). One side of the second limit block (245) is connected to a gear (246) that is driven by the side of the first limit rod (241) through tooth meshing. A limit block (247) is provided at one end of the first limit rod (241) away from the first limit block (242). A sliding groove (25) that fits with the internal roller of the limit block (247) is provided on the side of the slide rail (12) close to the slidable base (21), and the upper and lower ends of the sliding groove (25) are designed with large arc edges.

2. The air conditioning refrigeration pipe welding positioning tool according to claim 1 is characterized in that: The linkage (232) comprises a first linkage member (2321) and a second linkage member (2322) fixedly connected to the first linkage member (2321); an end of the first linkage member (2321) is rotatably connected to the lower surface of the clamping block (231) via a rotating shaft; an end of the first linkage member (2321) away from the clamping block (231) is rotatably connected to the upper surface of the slidable base (21); two second linkage members (2322) are provided and are symmetrically distributed with the placement tube (22) as the center; adjacent ends of a pair of second linkage members (2322) are connected by tooth meshing.

3. The air conditioning refrigeration pipe welding positioning tool according to claim 1 is characterized in that: The push block (233) is fixedly connected to the end surface of the clamping block (231) via a connecting rod (234) arranged at its outer end; a spring sheet (26) connected to the edge plate surface of the slidable base (21) is arranged on the side of the connecting rod (234); the slide rail (12) is connected to a return spring (28) via a blocking block (27) arranged on its outer surface; and a moving block (29) in contact with the lower surface of the push block (233) is installed at the top of the return spring (28); a side of the slide rail (12) close to the slidable base (21) is slidably connected to the side of the moving block (29) via a track; in an initial state, the moving block (29) is located at the upper end of the slide groove (25).

4. The air conditioning refrigeration pipe welding positioning tool according to claim 1 is characterized in that: The central axis of the space enclosed by the first limiting block (242) and the two second limiting blocks (245) coincides with the central axes of the placement tube (22), the first fixing ring (141), the second fixing ring (142) and the placement hole (13).

Images