A method for expanding and welding a heat exchanger

Abstract

This invention relates to the field of heat exchanger processing technology, specifically a method for expansion and welding in heat exchanger manufacturing. It includes an expansion mechanism for tightly fitting the outer wall of a heat exchange tube to the inner wall of a circular hole, and two extrusion mechanisms. The expansion mechanism is located inside the heat exchange tube and includes a slide rod with connecting plates fixedly connected to both ends. In this invention, the heat exchange tube is inserted into the circular hole on a baffle plate. The expansion mechanism is then inserted into the heat exchange tube and moved to the circular hole on the baffle plate. Activating the expansion mechanism compresses the heat exchange tube portion inside the circular hole, causing it to press against the inner wall of the hole. Simultaneously, the expansion mechanism pushes out two annular protrusions on the outer wall of the heat exchange tube, securing these protrusions to opposite sides of the baffle plate. The two extrusion mechanisms then flatten the two annular protrusions, pressing them tightly against the baffle plate. Finally, the flattened annular protrusions are welded to the baffle plate, thereby increasing the welding area between the baffle plate and the heat exchange plate, and improving the weld strength between them.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger processing technology, specifically a method for expansion and welding in heat exchanger manufacturing. Background Technology

[0002] A heat exchanger is a device that transfers heat from a hot fluid to a cold fluid. Common heat exchangers include fixed tube sheet heat exchangers. A fixed tube sheet heat exchanger consists of tube boxes, a shell, tube sheets, baffles, and heat exchange tubes. The two ends of the heat exchange tubes are connected to two tube sheets, and the two tube sheets are fixedly sleeved to the two ends of the shell. Two tube boxes are fixed to the two tube sheets. The baffles are mostly semi-circular. By adding multiple staggered baffles inside the shell, the water flow inside the shell will form a wave-shaped flow path due to the obstruction of the baffles. A fluid is injected into a tube box, flows through the heat exchange tubes, and is discharged from another tube box. Pipes are connected to both ends of the shell, and another fluid is injected and discharged through the two pipes. The other fluid flows through the shell and exchanges heat with the first fluid through the heat exchange tubes.

[0003] The baffle plate has pre-drilled holes for the heat exchange tubes to pass through. The baffle plate guides the liquid flow by blocking the flow of liquid inside the shell, allowing the liquid to flow through the gap between the baffle plate and the shell. However, the holes on the baffle plate are generally not fixed to the heat exchange tubes, resulting in a certain gap between the holes and the heat exchange tubes. The heat exchange tubes are only supported and positioned by the tube sheets at both ends. However, the heat exchange tubes are generally quite long, and during the operation of the heat exchanger, the heat exchange tubes are not only subject to liquid flow inside, but also to the impact of the liquid flow inside the shell. Positioning and fixing the heat exchange tubes only by the tube sheets at both ends can easily cause the middle of the heat exchange tubes to be subjected to greater liquid flow impact, affecting the service life of the heat exchange tubes. Furthermore, the gap between the baffle plate and the heat exchange tubes can easily allow liquid flow to pass through the gap between the heat exchange tubes and the baffle plate, causing eddies and other problems in the liquid flow inside the shell, affecting the normal flow of liquid inside the shell, which is quite inconvenient. Summary of the Invention

[0004] The purpose of this invention is to provide an expansion and welding method for manufacturing heat exchangers, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for expansion and welding in the manufacturing and processing of heat exchangers, the method being used to process baffles and heat exchange tubes, comprising:

[0007] Step 1: By machining multiple circular holes on one side of the baffle, insert the heat exchange tube into the circular holes on the baffle, and then use the expansion mechanism in the heat exchanger manufacturing and processing equipment in conjunction with two extrusion mechanisms to extrude two annular protrusions on the outer wall of the heat exchange tube, with the two annular protrusions located on opposite sides of the baffle.

[0008] Step 2: By using the extrusion mechanism to extrude the two annular protrusions on the heat exchange tube, the two annular protrusions are deformed and flattened under pressure, and the two flattened annular protrusions are tightly attached to the opposite sides of the baffle plate. Then, the two annular protrusions are welded to the baffle plate.

[0009] Heat exchanger manufacturing and processing equipment, including:

[0010] An expansion joint mechanism and two extrusion mechanisms are used to tightly fit the outer wall of the heat exchange tube to the inner wall of the circular hole. The expansion joint mechanism is located inside the heat exchange tube. The expansion joint mechanism includes a slide rod, and both ends of the slide rod are fixedly connected to connecting plates. Two collars are slidably sleeved on the outer wall of the slide rod, and multiple guide rails are provided on the outer wall of the slide rod. Both ends of the multiple guide rails are rotatably connected to guide rods. The middle of the two guide rods on any guide rail are rotatably connected to each other. One end of the two guide rods on any guide rail is rotatably connected to the outer wall of the two collars respectively. Two abutments are slidably engaged inside each guide rail. The two extrusion mechanisms are both located outside the heat exchange tube and are located on opposite sides of the baffle plate.

[0011] Furthermore, each guide rail has an adjusting screw rotatably connected between its two ends, each abutment has a threaded hole on one side, and each guide rail has two abutments that are screwed into the adjacent adjusting screw through the threaded hole. Each adjusting screw is a screw with both positive and negative threads.

[0012] Furthermore, each of the two connecting plates is provided with a positioning plate on opposite sides, and multiple fixing rods are fixedly connected between each positioning plate and the adjacent connecting plate. An air cylinder is fixedly connected to one side of each positioning plate, and a piston rod is slidably sleeved inside each air cylinder. One end of each piston rod is located outside the adjacent air cylinder, and a U-shaped rod is fixedly connected to one end of each piston rod. Both ends of each U-shaped rod penetrate the adjacent connecting plate and are fixedly connected to the adjacent collar.

[0013] Furthermore, each positioning plate has a pull rope fixedly connected to the other side.

[0014] Furthermore, each end of the heat exchange tube is provided with a motor box, and each motor box contains a drive motor. The motor shafts of the two drive motors are fixedly connected to rotating plates, and one side of each rotating plate has multiple insertion holes. Multiple drive rods are provided between the two rotating plates, and each drive rod corresponds one-to-one with multiple insertion holes on any rotating plate. Both ends of each drive rod pass through the corresponding insertion holes on the two rotating plates. Both ends of each drive rod are threaded and screwed with nuts. The outer walls of the two positioning plates are fixedly connected with multiple positioning holes, and each positioning hole on any positioning plate corresponds one-to-one with multiple drive rods. Each drive rod is movably inserted into the corresponding positioning hole.

[0015] Furthermore, each motor box has a support plate fixedly connected to both ends on one side, each support plate has two engagement holes on one side, each support plate is equipped with an engagement rod, each engagement rod is engaged with the adjacent engagement hole, and each engagement rod has an arc plate rotatably connected to one end, with the two arc plates on each motor box arranged alternately.

[0016] Furthermore, the extrusion mechanism includes:

[0017] The system comprises a cylinder, multiple U-shaped plates, and multiple pressure strips for pressing against the heat exchange tubes. The cylinder is movably connected to the heat exchange tubes. The multiple U-shaped plates are located inside the cylinder, and one side of each U-shaped plate is fixedly connected to the inner wall of the cylinder. An adjusting screw is rotatably connected between the two arms of any U-shaped plate. Each adjusting screw has both positive and negative threads. The multiple pressure strips correspond one-to-one with the multiple U-shaped plates. Each pressure strip has a rotating rod rotatably connected to both ends. One end of each of the two rotating rods on each pressure strip is rotatably connected to a slider. The two sliders on each pressure strip are slidably engaged between the two arms of adjacent U-shaped plates. Each slider has a screw hole on one side, and the inner wall of the screw hole on each slider is screwed into the outer wall of the adjacent adjusting screw.

[0018] Furthermore, the cylinders on both extrusion mechanisms are rotatably connected to opposite ends with toothed rings, and a gear is fixedly sleeved on one end of any adjusting screw. The teeth on any toothed ring mesh with the teeth on multiple adjacent gears.

[0019] Furthermore, the two cylinders are provided with slide rails below them, and each slide rail is slidably engaged with a moving rod. Each of the two moving rods is fixedly connected to a fixing ring at its top end, and the inner sidewalls of the two fixing rings are rotatably sleeved with the outer sidewalls of the two cylinders respectively. Each of the two slide rails is fixedly connected to a hydraulic cylinder at both ends, and the movable ends of the two hydraulic cylinders are fixedly connected to the two moving rods respectively.

[0020] Furthermore, each pressure strip is arc-shaped, each pressure strip has a hollow structure, and each pressure strip contains a magnet.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. By inserting the heat exchange tube into the circular hole on the baffle plate, and then inserting the expansion mechanism into the heat exchange tube and moving the expansion mechanism to the circular hole on the baffle plate, the expansion mechanism is activated to compress the heat exchange tube portion inside the circular hole and make it statically and tightly adhere to the inner wall of the circular hole. At the same time, the expansion mechanism pushes out two annular protrusions on the outer wall of the heat exchange tube and makes the two annular protrusions lock onto the opposite sides of the baffle plate, improving the fixing effect between the heat exchange tube and the baffle plate. Then, two extrusion mechanisms are used to flatten the two annular protrusions and press them tightly against the baffle plate. Finally, the flattened annular protrusions are welded to the baffle plate, thereby increasing the welding area between the baffle plate and the heat exchange plate, improving the welding firmness between the baffle plate and the heat exchange plate, and sealing the gap between the baffle plate and the heat exchange tube to prevent liquid flow.

[0023] 2. By inserting the slide rod into the heat exchange tube, and then passing multiple drive rods through the positioning holes on the positioning plate and the insertion holes on the rotating plate, the nut is tightened. Then, when the tightening rod is rotated, the two arc plates on the same motor box move towards each other by the same distance to clamp the heat exchange tube. When the two arc plates on the same motor box are crossed, they abut against each other, thereby fixing the heat exchange tube to the center of the rotating plate. Then, the two drive motors are started to drive the two collars to rotate through the rotating plate, the positioning plate drive rod, the connecting plate and the U-shaped rod. The two collars drive multiple guide rails to rotate synchronously. The distance between the two abutting blocks in the same guide rail is adjusted by pre-rotating multiple adjusting screws. The abutting blocks of the rotating guide rail abut against the inner wall of the heat exchange tube, so that the guide rail abuts against the heat exchange tube and makes its outer wall fit tightly against the circular hole. The abutting blocks abut against the heat exchange tube and make its outer wall form an annular protrusion.

[0024] 3. High-pressure gas is injected into the gas cylinder by the air pump, which pushes the piston rod inside the gas cylinder to move. This causes the piston rod to push the two collars to move through the U-shaped rod. The two collars then drive multiple adjacent guide rails to move away from or towards the slide rod simultaneously through the adjacent guide rods. This adjusts the position of the guide rails, so that the guide rails and the abutment gradually come into contact with the heat exchange tube during rotation.

[0025] 4. By rotating the gear ring on the cylinder, multiple adjacent gears are driven to rotate, which in turn drives multiple adjusting screws to rotate. The adjusting screws cause adjacent sliders to move synchronously towards or away from each other. This allows the sliders to adjust the distance between the pressure strips and the heat exchange tubes via the rotating rod. By rotating the gear ring, the distance between multiple pressure strips and the heat exchange tubes is adjusted, causing multiple pressure strips to adhere to the heat exchange tubes. Subsequently, the pressure strips adhere to the guide rails, and the pressure strips drive the guide rails to rotate, thus limiting the heat exchange tubes and reducing excessive deformation when the annular protrusion is pushed out by the abutment. Then, by resetting the two collars, the guide rails and abutment blocks are disengaged from the heat exchange tubes. Then, the two hydraulic cylinders are activated to drive the two cylinders to move back and forth, causing the pressure strips to flatten the annular protrusion and adhere to the baffle plate. This flattens the annular groove inside the heat exchange tube, thus making it less likely to affect the water flow through the heat exchange tubes. During the reciprocating movement of the pressure strips, the cylinders can be manually rotated to press the pressure strips on various parts of the annular protrusion. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram showing the positional relationship between the expansion mechanism and the extrusion mechanism in this invention;

[0028] Figure 3 This is a schematic diagram of the expansion joint mechanism in this invention;

[0029] Figure 4 This is an exploded view of the expansion joint mechanism in this invention;

[0030] Figure 5 This is a schematic diagram of the extrusion mechanism in this invention;

[0031] Figure 6 This is an exploded view of the extrusion mechanism structure in this invention;

[0032] Figure 7 This is a schematic diagram of the heat exchange tube cross-section structure after the expansion joint mechanism in this invention has been used.

[0033] Figure 8 This is a schematic diagram of the heat exchange tube cross-section structure after the extrusion mechanism in this invention has been used.

[0034] In the diagram: 100, baffle plate; 200, heat exchange tube; 300, expansion joint mechanism; 310, slide bar; 320, connecting plate; 330, collar; 340, guide rail; 341, adjusting screw; 342, stop block; 343, guide rod; 350, positioning plate; 351, fixing rod; 352, pull rope; 360, air cylinder; 361, piston rod; 370, motor box; 371, rotating plate; 372, drive rod; 380, support plate; 381, screw rod; 382, ​​arc plate; 400, extrusion mechanism; 410, cylinder; 420, gear ring; 430, U-shaped plate; 431, adjusting screw; 432, gear; 440, pressure bar; 441, rotating rod; 442, slider; 450, slide rail; 451, moving rod; 452, hydraulic cylinder. Detailed Implementation

[0035] 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.

[0036] Please see Figures 1-8 In this embodiment of the invention, a method for expansion and welding in the manufacturing and processing of a heat exchanger is provided. This method is used to process a baffle plate 100 and a heat exchange tube 200, and includes:

[0037] Step 1: By machining multiple circular holes on one side of the baffle plate 100, inserting the heat exchange tube 200 into the circular holes on the baffle plate 100, and then using the expansion mechanism 300 in the heat exchanger manufacturing and processing equipment in conjunction with two extrusion mechanisms 400 to extrude two annular protrusions on the outer wall of the heat exchange tube 200, and the two annular protrusions are located on opposite sides of the baffle plate 100 respectively.

[0038] Step 2: By using the extrusion mechanism 400 to extrude the two annular protrusions on the heat exchange tube 200, the two annular protrusions are deformed and flattened under pressure, and the two flattened annular protrusions are tightly attached to the opposite sides of the baffle plate 100. Then, the two annular protrusions are welded to the baffle plate 100.

[0039] Heat exchanger manufacturing and processing equipment, including:

[0040] The expansion joint mechanism 300 and two extrusion mechanisms 400 are located inside the heat exchange tube 200. The expansion joint mechanism 300 includes a slide rod 310, and both ends of the slide rod 310 are fixedly connected to a connecting plate 320. Two collars 330 are slidably sleeved on the outer wall of the slide rod 310, and multiple guide rails 340 are provided on the outer wall of the slide rod 310. Both ends of the multiple guide rails 340 are rotatably connected to guide rods 343. The two guide rods 343 on any guide rail 340 are rotatably connected to each other in the middle. One end of the two guide rods 343 on any guide rail 340 is rotatably connected to the outer wall of the two collars 330 respectively. Two abutments 342 are slidably engaged inside any guide rail 340. The two extrusion mechanisms 400 are both located outside the heat exchange tube 200, and the two extrusion mechanisms 400 are located on opposite sides of the baffle plate 100.

[0041] Specifically, by fixing the baffle 100 to the heat exchange tube 200, the auxiliary fixing effect of the baffle 100 on the heat exchange tube 200 is improved, while reducing the adverse effects on the liquid flow inside the shell. When the baffle 100 is fixed to the middle of the heat exchange tube 200, the heat exchange tube 200 can be inserted into the circular hole on the baffle 100, so that the middle of the heat exchange tube 200 moves to the circular hole on the baffle 100. Then, the expansion mechanism 300 is inserted into the heat exchange tube 200 until the expansion mechanism 300 moves to the circular hole on the baffle 100. Finally, the two extrusion mechanisms 400 are sleeved on the outside of the heat exchange tube 200, and the two extrusion mechanisms 400 are respectively located at the baffle. At opposite sides of the baffle plate 100, the expansion mechanism 300 is activated to cause the portion of the heat exchange tube 200 located inside the circular hole to expand and tightly adhere to the circular hole. The expansion mechanism 300 also forces two annular protrusions onto the outer wall of the heat exchange tube 200, with these two annular protrusions positioned at opposite sides of the baffle plate 100. This ensures the two annular protrusions are tightly attached to both sides of the baffle plate 100, improving the fixation between the heat exchange tube 200 and the baffle plate 100. Because the heat exchange tube 200 forms annular protrusions through inner wall compression, two annular grooves appear on the inner wall of the heat exchange tube 200. Water flowing through the heat exchange tube 200 may experience flow obstruction due to these annular grooves. Further... Two extrusion mechanisms 400 flatten the two annular protrusions on the heat exchange tube 200, causing the inner walls of the two annular grooves to come together due to the pressure on the annular protrusions. This reduces the impact on water flow and makes the flattened annular protrusions fit more tightly against the baffle plate 100, increasing the diameter of the flattened annular protrusions. The flattened annular protrusions are then welded to the baffle plate 100, increasing the welding area between the heat exchange tube 200 and the baffle plate 100, thus improving the weld strength between them. In use, the slide rod 310 and the two connecting plates 320 can be inserted into the heat exchange tube 200 and moved to the circular hole, and then either guide rail 3 can be moved. The two abutments 342 on the 40 move to opposite sides of the baffle 100. Then, by rotating the two collars 330, multiple guide rails 340 rotate synchronously. At the same time, the two collars 330 move towards each other while rotating, so that the two collars 330 drive multiple guide rails 340 to abut against the inner wall of the heat exchange tube 200 through the guide rod 343. At the same time, the abutments 342 abut against the inner wall of the heat exchange tube 200. This causes the guide rails 340 to press the heat exchange tube 200 tightly against the inside of the circular hole, and the abutments 342 to slide the inner wall of the heat exchange tube 200, so that the outer wall of the heat exchange tube 200 forms an annular protrusion.

[0042] Example 1

[0043] like Figures 2-4As shown, in this embodiment, an adjusting screw 341 is rotatably connected between both ends of any guide rail 340, and a threaded hole is provided on one side of any abutment 342. Two abutments 342 within any guide rail 340 are screwed into adjacent adjusting screws 341 through the threaded holes. Each adjusting screw 341 is a screw with both positive and negative threads. Positioning plates 350 are provided on opposite sides of the two connecting plates 320. Multiple fixing rods 351 are fixedly connected between each positioning plate 350 and the adjacent connecting plate 320. Each of the 0 and 1 sides is fixedly connected to an air cylinder 360. A piston rod 361 is slidably sleeved inside each air cylinder 360. One end of each piston rod 361 is located outside the adjacent air cylinder 360. A U-shaped rod is fixedly connected to one end of each piston rod 361. Both ends of each U-shaped rod pass through adjacent connecting plates 320 and are fixedly connected to adjacent collars 330. A pull rope 352 is fixedly connected to the other side of each positioning plate 350. Motor boxes 370 are installed at both ends of the heat exchange tube 200, and each motor box 370 contains a drive motor. Both drive motor shafts are fixedly connected to rotating plates 371, and multiple insertion holes are provided on one side of the rotating plates 371. Multiple drive rods 372 are arranged between the two rotating plates 371, and each drive rod 372 corresponds one-to-one with multiple insertion holes on any rotating plate 371. Both ends of each drive rod 372 pass through the corresponding insertion holes on the two rotating plates 371. Both ends of each drive rod 372 are threaded and screwed with nuts. Multiple positioning holes are fixedly connected to the outer walls of the two positioning plates 350. The multiple positioning holes correspond one-to-one with the multiple drive rods 372. Each drive rod 372 is movably inserted into the corresponding positioning hole. Each motor box 370 has a support plate 380 fixedly connected to both ends on one side. Each support plate 380 has two engagement holes on one side. Each support plate 380 is equipped with an engagement rod 381. Each engagement rod 381 is engaged with the adjacent engagement hole. Each engagement rod 381 has an arc plate 382 rotatably connected to one end. The two arc plates 382 on each motor box 370 are arranged alternately.

[0044] In this embodiment, when the expansion mechanism 300 is inserted into the heat exchange tube 200, the position of the expansion mechanism 300 inside the heat exchange tube 200 can be adjusted by pulling the two pull ropes 352. Then, multiple drive rods 372 are passed through the positioning holes on the two positioning plates 350 and then through the insertion holes on the two rotating plates 371. The drive rods 372 are then tightened with nuts to fix them. The pull ropes 352 are then tied to the drive rods 372 to fix the position of the expansion mechanism 300. Then, by starting the two drive motors, the two rotating plates 371 can be driven to rotate, and the two rotating plates 371 can drive the two positioning plates 350 and the connecting plate 320 to rotate synchronously through the drive rods 372. The connecting plate 320 drives the adjacent collar 330 and the guide rail 340 to rotate synchronously through the U-shaped rod. Before use, the user can adjust the distance between the two abutments 342 on the guide rail 340 according to the width of the baffle plate 100. By rotating the adjusting screw 341, the two abutments inside the adjacent guide rail 340 can be driven to rotate synchronously. The abutment blocks 342 can be moved towards or away from each other to adjust their position. When the user needs to move the collar 330, the pipe-connected air cylinder 360 can be injected with high-pressure gas through the air pump, so that the two air cylinders 360 are filled with an equal amount of high-pressure gas. The high-pressure gas pushes the piston rod 361 to move, and the piston rod 361 pushes the collar 330 to move. The air pump, pipe, and high-pressure gas are all existing technologies and will not be described in detail here. Before use, the user can rotate the two screw rods 381 on any motor box 370 to move the two arc plates 382 on any motor box 370 towards each other by an equal distance. The two arc plates 382 will clamp and press the heat exchange tube 200 in an alternating manner, so that the center of the rotating plate 371 and the central axis of the slide rod 310 are both located at the central axis of the heat exchange tube 200. This allows the expansion mechanism 300 to be positioned at the central axis of the heat exchange tube 200. The motor box 370 can be fixed to a suitable position by connecting the mounting bracket.

[0045] like Figure 2 and Figures 5-6 As shown, in this embodiment, the extrusion mechanism 400 includes:

[0046] The system comprises a cylinder 410, multiple U-shaped plates 430, and multiple pressure strips 440 for pressing against the heat exchange tubes 200. The cylinder 410 is movably connected to the heat exchange tubes 200. The multiple U-shaped plates 430 are all located inside the cylinder 410, and one side of each U-shaped plate 430 is fixedly connected to the inner wall of the cylinder 410. An adjusting screw 431 is rotatably connected between the two arms of each U-shaped plate 430. Each adjusting screw 431 has both positive and negative threads. The multiple pressure strips 440 correspond one-to-one with the multiple U-shaped plates 430. Each pressure strip 440 has a rotating rod 441 rotatably connected to both ends. Each rotating rod 441 has a slider 442 rotatably connected to one end. The two sliders 442 on any pressure bar 440 are slidably engaged between the two arms of the adjacent U-shaped plate 430. Each slider 442 has a lead screw hole on one side. The inner wall of the lead screw hole on each slider 442 is screwed into the outer wall of the adjacent adjusting lead screw 431. The cylinders 410 on the two extrusion mechanisms 400 are rotatably connected to toothed rings 420 at opposite ends. Each adjusting lead screw 431 has a gear 432 fixedly sleeved at one end. The teeth on each toothed ring 420 mesh with the teeth on the adjacent gears 432.

[0047] In practical implementation, before use, the cylinders 410 on the two extrusion mechanisms 400 can be fitted onto the outside of the heat exchange tube 200 and positioned on opposite sides of the baffle plate 100. Before the heat exchange tube 200 is pressed tightly against the inner wall of the circular hole on the baffle plate 100 by the multiple guide rails 340 and before the inner wall of the heat exchange tube 200 is pressed by the multiple blocks 342 to form an annular protrusion on the outer wall of the heat exchange tube 200, the adjacent gears 432 can be rotated synchronously by rotating the gear ring 420. This causes the gears 432 to drive the adjacent adjusting screws 431 to rotate. When the adjusting screws 431 rotate, they can drive the two adjacent sliders 442 to move synchronously towards each other or towards each other. The movement of the slider 442 causes the adjacent pressure strip 440 to move via the adjacent rotating rod 441, adjusting the distance between the pressure strip 440 and the heat exchange tube 200. This allows multiple pressure strips 440 in any cylinder 410 to simultaneously abut against the outer wall of the heat exchange tube 200. Furthermore, the user can weld an internal threaded ring to the outer wall of the cylinder 410 and screw an abutment bolt into the internal threaded ring. The abutment bolt abuts against the toothed ring 420 to fix the position of the toothed ring 420. When the guide rail 340 and the abutment block 342 abut against the heat exchange tube 200, the external pressure strip 440 is tightly abutted and limited, reducing excessive deformation of the heat exchange tube 200.

[0048] Example 2

[0049] Based on Embodiment 1, the slide rail 450 is provided to facilitate the adjustment of the positions of the two cylinders 410.

[0050] like Figure 2 and Figure 5As shown, in this embodiment, slide rails 450 are provided below the two cylinders 410, and movable rods 451 are slidably engaged inside the two slide rails 450. The top ends of the two movable rods 451 are fixedly connected to fixed rings, and the inner sidewalls of the two fixed rings are rotatably sleeved with the outer sidewalls of the two cylinders 410 respectively. Hydraulic cylinders 452 are fixedly connected to both ends of the two slide rails 450, and the movable ends of the two hydraulic cylinders 452 are fixedly connected to the two movable rods 451 respectively. Any pressure bar 440 is arc-shaped, any pressure bar 440 is a hollow structure, and a magnet is provided inside any pressure bar 440.

[0051] In specific implementation, the magnet inside the pressure strip 440 attracts the adjacent guide rail 340. The guide rail 340 is made of iron, while the pressure strip 440 uses a neodymium magnet with high magnetic strength, allowing the pressure strip 440 to be tightly attracted to the guide rail 340. The material of the pressure strip 440 depends on the material of the heat exchange tube 200. The friction between the material of the pressure strip 440 and the material of the heat exchange tube 200 is small, so that when the guide rail 340 rotates, it can drive the pressure strip 440 to rotate synchronously. When the abutment block 342 pushes the heat exchange tube 200 to form the annular protrusion, there is a certain gap between the cylinder 410 and the baffle plate 100 to facilitate the formation of the annular protrusion. After the annular protrusion is formed, it needs to be... When the extrusion mechanism 400 extrudes the annular protrusion, the high-pressure gas inside the air cylinder 360 is extracted, causing the collar 330 to reset and the abutment 342 and guide rail 340 to disengage from the heat exchange tube 200. Then, the two hydraulic cylinders 452 are activated to drive the two cylinders 410 to move back and forth, causing the pressure strips 440 on the cylinders 410 to extrude the annular protrusion, thereby flattening the annular protrusion and making it fit tightly against the baffle plate 100. Furthermore, the user can manually rotate the cylinders 410 while they are moving, so that the pressure strips 440 rotate synchronously with the cylinders 410 to apply pressure to all parts of the annular protrusion, thereby sealing the annular groove inside the heat exchange tube 200.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for expansion and welding in the manufacturing and processing of a heat exchanger, wherein the method is used to process baffles (100) and heat exchange tubes (200), characterized in that, include: Step 1: By machining multiple circular holes on one side of the baffle plate (100), insert the heat exchange tube (200) into the circular holes on the baffle plate (100), and then use the expansion mechanism (300) in the heat exchanger manufacturing and processing equipment in conjunction with two extrusion mechanisms (400) to extrude two annular protrusions on the outer wall of the heat exchange tube (200), and the two annular protrusions are located on opposite sides of the baffle plate (100); Step 2: By using the extrusion mechanism (400) to extrude the two annular protrusions on the heat exchange tube (200), the two annular protrusions are deformed and flattened under pressure, and the two flattened annular protrusions are closely attached to the opposite sides of the baffle plate (100), and then the two annular protrusions are welded to the baffle plate (100). Heat exchanger manufacturing and processing equipment, including: An expansion joint mechanism (300) is located inside the heat exchange tube (200). The expansion joint mechanism (300) includes a slide rod (310), and both ends of the slide rod (310) are fixedly connected to connecting plates (320). Two collars (330) are slidably sleeved on the outer wall of the slide rod (310), and multiple guide rails (340) are provided on the outer wall of the slide rod (310). Both ends of the multiple guide rails (340) are rotatably connected to guide rods (343). The two guide rods (343) on any guide rail (340) are rotatably connected to each other in the middle. One end of the two guide rods (343) on any guide rail (340) is rotatably connected to the outer wall of the two collars (330) respectively. Two abutments (342) are slidably engaged inside any guide rail (340). The two extrusion mechanisms (400) are located outside the heat exchange tube (200), and the two extrusion mechanisms (400) are located on opposite sides of the baffle plate (100).

2. The expansion and welding method for heat exchanger manufacturing and processing according to claim 1, characterized in that, An adjusting screw (341) is rotatably connected between the two ends inside any guide rail (340), and a threaded hole is opened on one side of any abutment (342). The two abutments (342) inside any guide rail (340) are screwed into the adjacent adjusting screw (341) through the threaded hole. Any adjusting screw (341) is a screw with both positive and negative threads.

3. The expansion and welding method for heat exchanger manufacturing and processing according to claim 1, characterized in that, Each of the two connecting plates (320) is provided with a positioning plate (350) on the opposite side. Each positioning plate (350) is fixedly connected to the adjacent connecting plate (320) with multiple fixing rods (351). Each positioning plate (350) is fixedly connected to one side with an air cylinder (360). Each air cylinder (360) is slidably sleeved with a piston rod (361). One end of each piston rod (361) is located outside the adjacent air cylinder (360). One end of each piston rod (361) is fixedly connected with a U-shaped rod. Both ends of each U-shaped rod pass through the adjacent connecting plate (320) and are fixedly connected to the adjacent collar (330).

4. The expansion and welding method for heat exchanger manufacturing and processing according to claim 3, characterized in that, A pull rope (352) is fixedly connected to the other side of each positioning plate (350).

5. The expansion and welding method for heat exchanger manufacturing and processing according to claim 3, characterized in that, Both ends of the heat exchange tube (200) are provided with motor boxes (370), and both motor boxes (370) are provided with drive motors. The motor shafts of the two drive motors are fixedly connected to rotating plates (371), and multiple insertion holes are opened on one side of the rotating plates (371). Multiple drive rods (372) are provided between the two rotating plates (371), and the multiple drive rods (372) correspond one-to-one with the multiple insertion holes on any rotating plate (371). The two ends of any drive rod (372) pass through the corresponding insertion holes on the two rotating plates (371). Both ends of any drive rod (372) are threaded and screwed with nuts. The outer walls of the two positioning plates (350) are fixedly connected with multiple positioning holes. The multiple positioning holes on any positioning plate (350) correspond one-to-one with the multiple drive rods (372), and each drive rod (372) is movably inserted into the corresponding positioning hole.

6. The expansion and welding method for heat exchanger manufacturing and processing according to claim 5, characterized in that, Each motor box (370) has a support plate (380) fixedly connected to both ends on one side. Each support plate (380) has two engagement holes on one side. Each support plate (380) is equipped with an engagement rod (381). Each engagement rod (381) is engaged with the adjacent engagement hole. Each engagement rod (381) has an arc plate (382) rotatably connected to one end. The two arc plates (382) on each motor box (370) are arranged alternately.

7. The expansion and welding method for manufacturing and processing heat exchangers according to claim 1, characterized in that, The extrusion mechanism (400) includes: The cylinder (410) is movably connected to the heat exchange tube (200) inside; Multiple U-shaped plates (430) are located inside the cylinder (410). One side of each U-shaped plate (430) is fixedly connected to the inner wall of the cylinder (410). An adjusting screw (431) is rotatably connected between the two arms of any U-shaped plate (430). Each adjusting screw (431) is a positive and negative thread screw. Multiple pressure strips (440) correspond one-to-one with multiple U-shaped plates (430). Each pressure strip (440) has a rotating rod (441) rotatably connected to both ends. Each pressure strip (440) has a slider (442) rotatably connected to one end of each of the two rotating rods (441). Each pressure strip (440) has two sliders (442) slidably engaged between the two arms of the adjacent U-shaped plates (430). Each slider (442) has a lead screw hole on one side. The inner wall of the lead screw hole on each slider (442) is screwed into the outer wall of the adjacent adjusting lead screw (431).

8. The expansion and welding method for manufacturing and processing heat exchangers according to claim 7, characterized in that, The cylinders (410) on the two extrusion mechanisms (400) are rotatably connected to toothed rings (420) at opposite ends. A gear (432) is fixedly sleeved on one end of any adjusting screw (431). The teeth on any toothed ring (420) mesh with the teeth on multiple adjacent gears (432).

9. The expansion and welding method for manufacturing and processing heat exchangers according to claim 7, characterized in that, Slide rails (450) are provided below the two cylinders (410), and movable rods (451) are slidably engaged inside the two slide rails (450). Fixed rings are fixedly connected to the top of the two movable rods (451), and the inner sidewalls of the two fixed rings are rotatably sleeved with the outer sidewalls of the two cylinders (410). Hydraulic cylinders (452) are fixedly connected to both ends of the two slide rails (450), and the movable ends of the two hydraulic cylinders (452) are fixedly connected to the two movable rods (451).

10. The expansion and welding method for manufacturing and processing heat exchangers according to claim 7, characterized in that, Each pressure strip (440) is arc-shaped, each pressure strip (440) is a hollow structure, and each pressure strip (440) has a magnet inside.

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