Expanded connection and welding method for heat exchanger manufacturing and machining

Abstract

The invention relates to the technical field of heat exchanger machining, in particular to an expanded connection and welding method for heat exchanger manufacturing and machining.The expanded connection and welding method comprises an expanded connection mechanism and two extrusion mechanisms, the expanded connection mechanism is used for enabling the outer wall of a heat exchange tube to be tightly attached to the inner wall of a circular hole, and the expanded connection mechanism is located in the heat exchange tube and comprises a sliding rod; and the two ends of the sliding rod are fixedly connected with connecting plates. According to the heat exchanger, the heat exchange tube is inserted into the circular hole in the baffle plate, the expanded connection mechanism is inserted into the heat exchange tube and moved to the circular hole in the baffle plate, the expanded connection mechanism is started to enable part of the heat exchange tube in the circular hole to be pressed and tightly attached to the inner wall of the circular hole, and meanwhile the expanded connection mechanism abuts against the outer side wall of the heat exchange tube out of the two annular protrusions; two annular protrusions are arranged on the baffle plate, the two annular protrusions are clamped on the two opposite sides of the baffle plate, then the two extrusion mechanisms are used for flattening the two annular protrusions to be tightly attached to the baffle plate, and then the flattened annular protrusions are welded to the baffle plate, so that the welding area between the baffle plate and the heat exchange plate is increased, and the welding firmness between the baffle plate and the heat exchange plate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchanger processing, and specifically to a method for expansion jointing and welding in the manufacturing and processing of heat exchangers. Background Technique

[0002] A heat exchanger is a device that transfers the heat of a hot fluid to a cold fluid. Common heat exchangers include fixed tube sheet heat exchangers, etc. A fixed tube sheet heat exchanger consists of a tube box, a shell, tube sheets, baffle plates, and heat exchange tubes. Both ends of the heat exchange tubes are respectively connected to two tube sheets, and the two tube sheets are fixedly sleeved at both ends of the shell. Two tube boxes are respectively fixed at the two tube sheets. The baffle plates are mostly semi-circular. By adding a plurality of staggeredly arranged baffle plates inside the shell, the water flow in the shell will form a wavy flow path due to the obstruction of the baffle plates. By injecting a fluid into the tube box, the fluid flows through the heat exchange tubes and then discharges from the other tube box, and pipelines are connected at both ends of the shell. By injecting and discharging another fluid through the two pipelines, the other fluid flows through the shell and exchanges heat with one fluid through the heat exchange tubes;

[0003] Holes are pre-opened on the baffle plates for the heat exchange tubes to penetrate. The baffle plates guide the liquid flow by blocking the liquid flow in the shell and making the liquid flow through the gap between the baffle plates and the shell. Generally, the holes on the baffle plates are not fixed to the heat exchange tubes, resulting in a certain gap between the holes on the baffle plates and the heat exchange tubes. The heat exchange tubes are only supported and positioned by the tube sheets at both ends. Generally, the length of the heat exchange tubes is relatively long, and when the heat exchanger is in use, not only will there be liquid flow inside the heat exchange tubes, but also the heat exchange tubes will be impacted by the liquid flow inside the shell outside. Only positioning and fixing the heat exchange tubes by the tube sheets at both ends of the heat exchange tubes easily causes the middle part of the heat exchange tubes to be greatly impacted by the liquid flow, affecting the service life of the heat exchange tubes. And generally, there is a gap between the baffle plates and the heat exchange tubes, which easily causes the liquid flow to pass through the gap between the heat exchange tubes and the baffle plates, thereby causing situations such as eddy currents in the liquid flow inside the shell, affecting the normal flow of the liquid flow inside the shell, which is rather inconvenient. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for expansion jointing and welding in the manufacturing and processing of heat exchangers to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A method for expansion jointing and welding in the manufacturing and processing of heat exchangers, the method for expansion jointing and welding in the manufacturing and processing of heat exchangers is used for processing baffle plates and heat exchange tubes, including:

[0007] Step 1: By machining a plurality of circular holes on one side of the baffle plate, inserting the heat exchange tubes into the circular holes on the baffle plate, and then using the expansion joint mechanism and two extrusion mechanisms in the heat exchanger manufacturing and processing equipment to extrude two annular protrusions on the outer wall of the heat exchange tubes, and the two annular protrusions are respectively located on opposite sides of the baffle plate;

[0008] Step 2: By using the extrusion mechanism to extrude the two annular protrusions on the heat exchange tubes, making the two annular protrusions deformed and flattened under pressure, and making the two flattened annular protrusions closely abut against the opposite sides of the baffle plate, and then welding the two annular protrusions to the baffle plate;

[0009] The heat exchanger manufacturing and processing equipment includes:

[0010] An expansion joint mechanism and two extrusion mechanisms for closely attaching 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 sliding rod, and connecting plates are fixedly connected to both ends of the sliding rod. Two collar rings are slidably sleeved on the outer wall of the sliding rod, and a plurality of guide rails are arranged on the outer wall of the sliding rod. Both ends of each of the plurality of guide rails are rotatably connected to a guide rod. The middle parts of the two guide rods on any one of the guide rails are rotatably connected to each other. One end of each of the two guide rods on any one of the guide rails is rotatably connected to the outer wall of the adjacent collar ring. Two abutting blocks are slidably clamped inside each of the guide rails. The two extrusion mechanisms are both located outside the heat exchange tube, and the two extrusion mechanisms are respectively located on opposite sides of the baffle plate.

[0011] Furthermore: An adjusting screw is rotatably connected between both ends inside each of the guide rails. A threaded hole is opened on one side of each of the abutting blocks. The two abutting blocks inside each of the guide rails are screwed with the adjacent adjusting screw through the threaded holes. Each of the adjusting screws is a double-threaded screw.

[0012] Furthermore: Positioning plates are arranged on the opposite sides of the two connecting plates. A plurality of fixing rods are fixedly connected between any one of the positioning plates and the adjacent connecting plate. An air cylinder is fixedly connected to one side of each of the positioning plates. A piston rod is slidably sleeved inside each of the air cylinders. One end of each of the piston rods is located outside the adjacent air cylinder. One end of each of the piston rods is fixedly connected to a U-shaped rod. Both ends of each of the U-shaped rods penetrate through the adjacent connecting plate and are fixedly connected to the adjacent collar ring.

[0013] Furthermore: A pull rope is fixedly connected to the other side of each of the positioning plates.

[0014] Furthermore, motor boxes are provided at both ends of the heat exchange tube, and drive motors are arranged inside both motor boxes. Motor shafts of the two drive motors are fixedly connected with rotating plates, and a plurality of jacks are formed on one side of each rotating plate. A plurality of drive rods are arranged between the two rotating plates, and the plurality of drive rods correspond to the plurality of jacks on any one of the rotating plates one by one. Both ends of any one drive rod respectively penetrate into the corresponding jacks on the two rotating plates, threads are formed at both ends of any one drive rod, and nuts are screwed thereon. A plurality of positioning holes are fixedly connected to the outer side walls of the two positioning plates, the plurality of positioning holes on any one positioning plate correspond to the plurality of drive rods one by one, and any one drive rod is movably inserted into the corresponding positioning hole.

[0015] Furthermore, at both ends on one side of any one motor box, support plates are fixedly connected, two screwing holes are formed on one side of any one support plate, screwing rods are arranged for each support plate, any one screwing rod is screwed with the adjacent screwing hole, one end of any one screwing rod is rotatably connected with an arc-shaped plate, and the two arc-shaped plates on any one motor box are arranged staggeredly.

[0016] Furthermore, the extrusion mechanism includes:

[0017] A cylinder, a plurality of U-shaped plates and a plurality of pressing strips for pressing the heat exchange tube. The inside of the cylinder is movably sleeved with the heat exchange tube. The plurality of U-shaped plates are all located inside the cylinder. One side of each of the plurality of U-shaped plates is fixedly connected with the inner side wall of the cylinder. An adjusting screw rod is rotatably connected between the two arms of any one U-shaped plate. Any one adjusting screw rod is a left-right hand thread screw rod. The plurality of pressing strips correspond to the plurality of U-shaped plates one by one. Both ends of any one pressing strip are rotatably connected with rotating rods. One ends of the two rotating rods on any one pressing strip are rotatably connected with sliding blocks. The two sliding blocks on any one pressing strip are slidably clamped between the two arms of the adjacent U-shaped plate. A screw rod hole is formed on one side of any one sliding block, and the inner side wall of the screw rod hole on any one sliding block is screwed with the outer side wall of the adjacent adjusting screw rod.

[0018] Furthermore, ring gears are rotatably connected to the opposite ends of the cylinders on the two extrusion mechanisms. A gear is fixedly sleeved on one end of any one adjusting screw rod, and the teeth on any one ring gear are meshed with the teeth on the adjacent plurality of gears.

[0019] Furthermore, slide rails are arranged below the two cylinders, and moving rods are slidably clamped inside the two slide rails. Fixed rings are fixedly connected to the tops of the two moving rods, and the inner side walls of the two fixed rings are respectively rotatably sleeved with the outer side walls of the two cylinders. Hydraulic cylinders are fixedly connected to both ends of the two slide rails, and the movable ends of the two hydraulic cylinders are respectively fixedly connected with the two moving rods.

[0020] Furthermore, any one pressing strip is arc-shaped, any one pressing strip is of a hollow structure, and a magnet is arranged inside any one pressing strip.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Insert the heat exchange tube into the circular hole on the baffle, then insert the expansion mechanism into the heat exchange tube, and move the expansion mechanism to the circular hole on the baffle, and then start the expansion mechanism to press the heat exchange tube part inside the circular hole and close to the inner wall of the circular hole. At the same time, the expansion mechanism pushes out two annular protrusions from the outer wall of the heat exchange tube, and the two annular protrusions are stuck on the opposite sides of the baffle to improve the fixing effect between the heat exchange tube and the baffle, and then use two extrusion mechanisms to flatten the two annular protrusions and press them against the baffle, and then weld the flattened annular protrusions to the baffle, so as to increase the welding area between the baffle and the heat exchange plate, improve the welding firmness between the baffle and the heat exchange plate, and at the same time block the gap between the baffle and the heat exchange tube to prevent liquid from flowing through.

[0023] 2. Insert the slide rod into the heat exchange tube, and then pass multiple drive rods through the positioning holes on the positioning plate and the jacks on the rotating plate, and then screw the nuts together. Then, when the screwing 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, and the two arc plates on the same motor box contact each other when staggered, so that the heat exchange tube is fixed to the center of the rotating plate. Then, start the two drive motors to drive the two sleeves to rotate through the rotating plate, the positioning plate drive rod, the connecting plate and the U-shaped rod, so that the two sleeves drive multiple guide rails to rotate synchronously, and rotate multiple adjustment screws in advance to adjust the distance between the two stop blocks in the same guide rail, and the stop blocks of the rotating guide rail contact the inner wall of the heat exchange tube, so that the guide rail contacts the heat exchange tube so that its outer wall is closely attached to the circular hole, and the stop blocks contact the heat exchange tube so that its outer wall forms an annular protrusion;

[0024] 3. Inject high-pressure gas into the cylinder through an air pump, so that the piston rod in the cylinder is pushed by the gas to move, so that the piston rod pushes the two rings to move through the U-shaped rod, so that the two rings drive the adjacent multiple guide rails to move away from the slide rod or approach the slide rod synchronously through the adjacent guide rod, thereby adjusting the position of the guide rail, so that the guide rail and the block gradually contact the heat exchange tube during the rotation process;

[0025] 4. By rotating the toothed ring on the cylinder, multiple adjacent gears are driven to rotate, thereby driving multiple adjusting lead screws to rotate, causing the adjusting lead screws to drive two adjacent sliders to move synchronously towards or away from each other. As a result, the sliders adjust the distance between the pressing strip and the heat exchange tube through the rotating rod. By rotating the toothed ring, the distances between multiple pressing strips and the heat exchange tube are adjusted, causing the multiple pressing strips to abut against the heat exchange tube. Subsequently, the pressing strip adsorbs to the guide rail, and the pressing strip drives the guide rail to rotate, enabling the multiple pressing strips to limit the heat exchange tube, reducing excessive deformation of the heat exchange tube when it is pushed out of the annular protrusion by the abutting block. Then, by resetting the two collar rings, the guide rail and the abutting block are separated from the heat exchange tube. Subsequently, two hydraulic cylinders are started to drive the two cylinders to reciprocate, causing the pressing strip to flatten the annular protrusion and abut against the baffle plate, flattening the internal annular groove of the heat exchange tube, thereby not easily affecting the water flow through the heat exchange tube. When the pressing strip reciprocates, the pressing strip can be manually rotated to press various parts of the annular protrusion by rotating the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0027] Figure 2 is a schematic diagram of the positional relationship between the expansion joint mechanism and the extrusion mechanism in the present invention;

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

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

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

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

[0032] Figure 7 is a schematic diagram of the cross-sectional structure of the heat exchange tube after the expansion joint mechanism in the present invention is used up;

[0033] Figure 8 is a schematic diagram of the cross-sectional structure of the heat exchange tube after the extrusion mechanism in the present invention is used up.

[0034] In the figure: 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, abutting block; 343, guide rod; 350, positioning plate; 351, fixing rod; 352, pulling rope; 360, air cylinder; 361, piston rod; 370, motor box; 371, rotating plate; 372, driving rod; 380, support plate; 381, screwing rod; 382, arc plate; 400, extrusion mechanism; 410, cylinder; 420, toothed ring; 430, U-shaped plate; 431, adjusting lead screw; 432, gear; 440, pressing strip; 441, rotating rod; 442, slider; 450, slide rail; 451, moving rod; 452, hydraulic cylinder. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1-8 , in the embodiment of the present invention, a method for expansion joint and welding in the manufacturing and processing of a heat exchanger, the method for expansion joint and welding in the manufacturing and processing of a heat exchanger is used for processing the baffle plate 100 and the heat exchange tube 200, including:

[0037] Step 1: By processing a plurality of 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 joint mechanism 300 in the heat exchanger manufacturing and processing equipment to cooperate with the two extrusion mechanisms 400 to extrude two annular protrusions on the outer side wall of the heat exchange tube 200, and the two annular protrusions are respectively located on the opposite sides of the baffle plate 100;

[0038] Step 2: By using the extrusion mechanism 400 to extrude the two annular protrusions on the heat exchange tube 200, making the two annular protrusions deformed and flattened under pressure, and making the two flattened annular protrusions closely adhere to the opposite sides of the baffle plate 100, and then welding the two annular protrusions to the baffle plate 100;

[0039] The heat exchanger manufacturing and processing equipment includes:

[0040] An expansion joint mechanism 300 and two extrusion mechanisms 400. The expansion joint mechanism 300 is located inside the heat exchange tube 200. The expansion joint mechanism 300 includes a sliding rod 310, and connecting plates 320 are fixedly connected to both ends of the sliding rod 310. Two collar rings 330 are slidably sleeved on the outer sidewall of the sliding rod 310, and a plurality of guide rails 340 are arranged on the outer sidewall of the sliding rod 310. Guide rods 343 are rotatably connected to both ends of the plurality of guide rails 340. The middle parts of the two guide rods 343 on any one of the guide rails 340 are rotatably connected to each other. One end of the two guide rods 343 on any one of the guide rails 340 is respectively rotatably connected to the outer sidewall of the two collar rings 330. Two abutting blocks 342 are slidably clamped inside any one of the guide rails 340. Both of the two extrusion mechanisms 400 are located outside the heat exchange tube 200, and the two extrusion mechanisms 400 are respectively located on opposite sides of the baffle 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, and at the same time, the adverse effect on the liquid flow inside the shell is reduced. 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 part of the heat exchange tube 200 moves to the circular hole on the baffle 100. Then, the expansion joint mechanism 300 is inserted into the heat exchange tube 200 until the expansion joint mechanism 300 moves to the circular hole on the baffle 100. Then, the two extrusion mechanisms 400 are sleeved outside the heat exchange tube 200, and the two extrusion mechanisms 400 are respectively located on the opposite sides of the baffle 100. Then, by starting the expansion joint mechanism 300, the part of the heat exchange tube 200 inside the circular hole bulges and closely adheres to the circular hole, and the expansion joint mechanism 300 extrudes two annular protrusions on the outer side wall of the heat exchange tube 200, and the two annular protrusions are respectively located on the opposite sides of the baffle 100, so that the two annular protrusions closely adhere to both sides of the baffle 100, improving the fixing effect between the heat exchange tube 200 and the baffle 100. Since the annular protrusions are formed by the extrusion of the inner side wall of the heat exchange tube 200, there will be two annular grooves on the inner side wall of the heat exchange tube 200. The water flow flowing through the heat exchange tube 200 may be affected by the annular grooves when passing through the annular grooves. Then, the two extrusion mechanisms 400 are used to squeeze and flatten the two annular protrusions on the heat exchange tube 200, so that the inner walls of the two annular grooves are close to each other due to the extrusion of the annular protrusions, so that the water flow is not easily affected, and the flattened annular protrusions after being pressed are more closely attached to the baffle 100, and the diameter of the flattened annular protrusions increases. Then, the flattened annular protrusions are welded to the baffle 100, thereby increasing the welding area between the heat exchange tube 200 and the baffle 100 and improving the welding firmness between the baffle 100 and the heat exchange tube 200. When in use, the sliding rod 310 and the two connecting plates 320 can be inserted into the heat exchange tube 200 and moved to the circular hole. Then, the two abutting blocks 342 on any one of the guide rails 340 are moved, so that the two abutting blocks 342 move to the opposite sides of the baffle 100. Then, by rotating the two collar rings 330, the multiple guide rails 340 are driven to rotate synchronously. At the same time, when the collar rings 330 rotate, the two collar rings 330 are moved towards each other, so that the two collar rings 330 drive the multiple guide rails 340 to abut against the inner side wall of the heat exchange tube 200 through the guide rods 343, and at the same time, the abutting blocks 342 abut against the inner side wall of the heat exchange tube 200, so that the guide rails 340 abut against the inner side wall of the heat exchange tube 200 to squeeze the heat exchange tube 200 to closely adhere to the inside of the circular hole, and the abutting blocks 342 slide the inner side wall of the heat exchange tube 200, so that annular protrusions are formed on the outer side wall of the heat exchange tube 200.

[0042] Embodiment 1

[0043] As Figures 2-4As shown, in this embodiment, an adjusting screw 341 is rotatably connected between the two ends inside any guide rail 340. A threaded hole is formed on one side of any abutting block 342. The two abutting blocks 342 inside any guide rail 340 are screwed with the adjacent adjusting screw 341 through the threaded holes. Any adjusting screw 341 is a positive and negative thread screw. Positioning plates 350 are arranged on the opposite sides of the two connecting plates 320. A plurality of fixing rods 351 are fixedly connected between any positioning plate 350 and the adjacent connecting plate 320. An air cylinder 360 is fixedly connected to one side of any positioning plate 350. A piston rod 361 is slidably sleeved inside any air cylinder 360. One end of any piston rod 361 is located outside the adjacent air cylinder 360. A U-shaped rod is fixedly connected to one end of any piston rod 361. Both ends of any U-shaped rod penetrate through the adjacent connecting plate 320 and are fixedly connected to the adjacent collar 330. A pull rope 352 is fixedly connected to the other side of any positioning plate 350. Motor boxes 370 are arranged at both ends of the heat exchange tube 200. Driving motors are arranged inside the two motor boxes 370. Motor shafts of the two driving motors are fixedly connected with rotating plates 371. A plurality of jacks are formed on one side of the rotating plate 371. A plurality of driving rods 372 are arranged between the two rotating plates 371. The plurality of driving rods 372 correspond to the plurality of jacks on any rotating plate 371 one by one. Both ends of any driving rod 372 penetrate through the corresponding jacks inside the two rotating plates 371. Threads are formed at both ends of any driving rod 372 and are screwed with nuts. A plurality of positioning holes are fixedly connected to the outer side walls of the two positioning plates 350. The plurality of positioning holes on any positioning plate 350 correspond to the plurality of driving rods 372 one by one. Any driving rod 372 is movably inserted into the corresponding positioning hole. Support plates 380 are fixedly connected to both ends at one side of any motor box 370. Two screwing holes are formed on one side of any support plate 380. Any support plate 380 is provided with a screwing rod 381 in a matching manner. Any screwing rod 381 is screwed with the adjacent screwing hole. One end of any screwing rod 381 is rotatably connected with an arc-shaped plate 382. The two arc-shaped plates 382 on any motor box 370 are arranged in a staggered manner.

[0044] In this embodiment, when inserting the expansion joint mechanism 300 into the interior of the heat exchange tube 200, the position of the expansion joint mechanism 300 within the heat exchange tube 200 can be adjusted by pulling two draw ropes 352. Then, a plurality of 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. Then, nuts are screwed onto the drive rods 372 for fixation. Then, the draw ropes 352 are tied to the drive rods 372 to fix the position of the expansion joint mechanism 300. Then, by starting two drive motors, the two rotating plates 371 can be driven to rotate, and the two rotating plates 371 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 abutting blocks 342 on the guide rail 340 according to the width of the baffle 100. By rotating the adjusting screw rod 341, the two abutting blocks 342 inside the adjacent guide rails 340 can be driven to move towards or away from each other, so as to adjust the position of the abutting blocks 342. When the user needs to move the collar 330, the pipeline connection air cylinder 360 can be injected with high-pressure gas through an air pump, so that an equal amount of high-pressure gas is injected into the two air cylinders 360. 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, pipeline, high-pressure gas, etc. are all prior arts and will not be elaborated here. And before use, the user can rotate the two screwing rods 381 on any one of the motor boxes 370, so that the two arc-shaped plates 382 on any one of the motor boxes 370 move towards each other by the same distance, and the two arc-shaped plates 382 intersect to clamp and press the heat exchange tube 200, so that the center of the rotating plate 371 and the central axis of the sliding rod 310 are both located on the central axis of the heat exchange tube 200, so that the expansion joint mechanism 300 can be positioned at the central axis of the heat exchange tube 200. The motor box 370 can be fixed to a suitable position through the connecting mounting bracket.

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

[0046] The cylinder 410, a plurality of U-shaped plates 430 and a plurality of pressure strips 440 for pressing the heat exchange tube 200, the interior of the cylinder 410 is movably connected to the heat exchange tube 200, the plurality of U-shaped plates 430 are all located inside the cylinder 410, one side of the plurality of U-shaped plates 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, and any adjusting screw 431 is a positive and negative threaded screw, and the plurality of pressure strips 440 correspond to the plurality of U-shaped plates 430 one by one, and both ends of any pressure strip 440 are rotatably connected to a rotating rod 441, and the two ends of any pressure strip 440 are rotatably connected to the rotating rod 441, and the two ends of any pressure strip 440 are fixedly connected to the inner wall of the cylinder 410. One end of each rotating rod 441 is rotatably connected to a slider 442, and the two sliders 442 on any pressure strip 440 are slidably clamped between the two arms of the adjacent U-shaped plate 430. A screw hole is opened on one side of any slider 442, and the inner side wall of the screw hole on any slider 442 is screwed with the outer side wall of the adjacent adjusting screw 431. The cylinders 410 on the two extrusion mechanisms 400 are rotatably connected to the gear ring 420 at the opposite ends, and a gear 432 is fixedly sleeved on one end of any adjusting screw 431, and the teeth on any gear ring 420 are meshed with the teeth on the adjacent multiple gears 432.

[0047] In a specific implementation, before use, the cylinders 410 on the two extrusion mechanisms 400 can be sleeved on the outside of the heat exchange tube 200 and located on the opposite sides of the baffle 100. When the multiple guide rails 340 press, the heat exchange tube 200 is close to the inner wall of the circular hole on the baffle 100, and the multiple blocks 342 press the inner wall of the heat exchange tube 200 to form an annular protrusion on the outer wall of the heat exchange tube 200. The adjacent gears 432 can be driven to rotate synchronously by rotating the gear ring 420, so that the gears 432 drive the adjacent adjusting screw rods 431 to rotate. When the adjusting screw rods 431 rotate, the two adjacent sliders 442 can be driven to rotate synchronously toward or toward each other. The slider 442 moves away from the adjacent pressure strips 440 through the adjacent rotating rods 441 when it moves, and the spacing between the pressure strips 440 and the heat exchange tube 200 is adjusted, so that multiple pressure strips 440 in any cylinder 410 are synchronously pressed against the outer wall of the heat exchange tube 200, and the user can weld an internal threaded ring on the outer wall of the cylinder 410, and screw in the abutment bolts in the internal threaded ring, and use the abutment bolts to press against the toothed ring 420 to fix the position of the toothed ring 420, and when the guide rail 340 and the abutment block 342 press against the heat exchange tube 200, the pressure strips 440 on the outside are tightly pressed against the limit, thereby reducing excessive deformation of the heat exchange tube 200.

[0048] Embodiment 2

[0049] On the basis of the first embodiment, the positions of the two cylinders 410 are adjusted conveniently by providing a slide rail 450 .

[0050] like Figure 2 and Figure 5As shown, in the present embodiment, a slide rail 450 is provided below the two cylinders 410, and a moving rod 451 is slidably engaged inside the two slide rails 450, the tops of the two moving rods 451 are fixedly connected with a fixing ring, and the inner walls of the two fixing rings are rotatably sleeved with the outer walls of the two cylinders 410 respectively, hydraulic cylinders 452 are fixedly connected at both ends of the two slide rails 450, and the movable ends of the two hydraulic cylinders 452 are fixedly connected with the two moving rods 451 respectively, any pressure strip 440 is arc-shaped, any pressure strip 440 is a hollow structure, and a magnet is provided inside any pressure strip 440.

[0051] In a specific implementation, the magnet inside the pressure strip 440 is adsorbed with the adjacent guide rail 340. The guide rail 340 is made of iron material, and the pressure strip 440 is made of a rubidium magnet with high magnetism, so that the pressure strip 440 can be closely adsorbed with 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 pressure strip 440 and the material of the heat exchange tube 200 is small, so that when the guide rail 340 rotates, the pressure strip 440 can be driven to rotate synchronously. When the block 342 pushes the heat exchange tube 200 to form an annular protrusion, there is a certain gap between the cylinder 410 and the baffle 100, which is convenient for the annular protrusion to be formed. After the annular protrusion is formed, it is necessary to When the annular protrusion is squeezed by the squeezing mechanism 400, the high-pressure gas inside the gas cylinder 360 can be extracted to reset the sleeve 330, and the stop block 342 and the guide rail 340 can be separated from the heat exchange tube 200. Then, the two hydraulic cylinders 452 are started to drive the two cylinders 410 to move back and forth, so that the pressure strip 440 on the cylinder 410 squeezes the annular protrusion, thereby flattening the annular protrusion and making it close to the baffle 100. In addition, the user can manually turn the cylinder 410 to rotate when the cylinder 410 moves, so that the pressure strip 440 rotates synchronously with the cylinder 410 to apply pressure to all parts of the annular protrusion, so that the annular groove inside the heat exchange tube 200 is pressurized and closed.

[0052] It will be apparent to those skilled in the art that the 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 the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0053] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard 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. An expansion and welding method for manufacturing a heat exchanger, the expansion and welding method for manufacturing a heat exchanger being used for processing a baffle (100) and a heat exchange tube (200), characterized in that: include: Step 1: a plurality of circular holes are machined on one side of the baffle plate (100), a heat exchange tube (200) is inserted into the circular holes on the baffle plate (100), and then an expansion mechanism (300) in a heat exchanger manufacturing and processing device is used in conjunction with two extrusion mechanisms (400) to extrude two annular protrusions from the outer wall of the heat exchange tube (200), wherein the two annular protrusions are respectively located on opposite sides of the baffle plate (100); Step 2: using the extrusion mechanism (400) to extrude the two annular protrusions on the heat exchange tube (200), so that the two annular protrusions are deformed and flattened under pressure, and the two flattened annular protrusions are tightly attached to 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 mechanism (300) is located inside the heat exchange tube (200), the expansion mechanism (300) comprises a slide rod (310), and both ends of the slide rod (310) are fixedly connected to a connecting plate (320), the outer wall of the slide rod (310) is slidably sleeved with two collars (330), and the outer wall of the slide rod (310) is provided with a plurality of guide rails (340), both ends of the plurality of guide rails (340) are rotatably connected to guide rods (343), the middle parts of the two guide rods (343) on any guide rail (340) are rotatably connected to each other, one end of the two guide rods (343) on any guide rail (340) is rotatably connected to the outer walls of the two collars (330), and two abutment blocks (342) are slidably clamped 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 respectively located at two opposite sides of the baffle plate (100).

2. The expansion and welding method for heat exchanger manufacturing according to claim 1, characterized in that: An adjusting screw (341) is rotatably connected between the two ends of each guide rail (340), a threaded hole is provided on one side of each stop block (342), and two stop blocks (342) in each guide rail (340) are screwed together with adjacent adjusting screws (341) through the threaded holes, and each adjusting screw (341) is a positive and negative thread screw.

3. The expansion and welding method for heat exchanger manufacturing according to claim 1, characterized in that: A positioning plate (350) is provided on the opposite side of the two connecting plates (320); a plurality of fixing rods (351) are fixedly connected between any positioning plate (350) and the adjacent connecting plate (320); a gas cylinder (360) is fixedly connected to one side of any positioning plate (350); a piston rod (361) is slidably sleeved inside any gas cylinder (360); one end of any piston rod (361) is located outside the adjacent gas cylinder (360); one end of any piston rod (361) is fixedly connected to a U-shaped rod; and both ends of any U-shaped rod penetrate the adjacent connecting plate (320) and are fixedly connected to the adjacent collar (330).

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

5. The expansion and welding method for heat exchanger manufacturing according to claim 3, characterized in that: Motor boxes (370) are provided at both ends of the heat exchange tube (200), and drive motors are provided inside the two motor boxes (370). The motor shafts of the two drive motors are fixedly connected to a rotating plate (371), and a plurality of plug holes are provided on one side of the rotating plate (371). A plurality of drive rods (372) are provided between the two rotating plates (371), and the plurality of drive rods (372) correspond one-to-one to the plurality of plug holes on any rotating plate (371). Both ends of any drive rod (372) respectively penetrate the corresponding plug holes on the two rotating plates (371). Both ends of any drive rod (372) are provided with threads and screwed with nuts. The outer walls of the two positioning plates (350) are fixedly connected to a plurality of positioning holes. The plurality of positioning holes on any positioning plate (350) correspond one-to-one to the plurality of drive rods (372), and any drive rod (372) is movably plugged into the corresponding positioning holes.

6. The expansion and welding method for heat exchanger manufacturing according to claim 5, characterized in that: Support plates (380) are fixedly connected at both ends of one side of any motor box (370), two screw holes are provided on one side of any support plate (380), and any support plate (380) is equipped with a screw rod (381), and any screw rod (381) is screwed and connected to adjacent screw holes, and one end of any screw rod (381) is rotatably connected to an arc plate (382), and the two arc plates (382) on any motor box (370) are arranged in a staggered manner.

7. The expansion and welding method for heat exchanger manufacturing according to claim 1, characterized in that: The extrusion mechanism (400) comprises: A cylinder (410), the interior of which is movably sleeved with the heat exchange tube (200); A plurality of U-shaped plates (430) are all located inside the cylinder (410); one side of the plurality of U-shaped plates (430) is fixedly connected to the inner wall of the cylinder (410); an adjusting screw rod (431) is rotatably connected between two arms of any U-shaped plate (430); and any adjusting screw rod (431) is a positive and negative threaded screw rod; A plurality of pressure strips (440) correspond one to one with the plurality of U-shaped plates (430); both ends of any pressure strip (440) are rotatably connected to a rotating rod (441); one end of two rotating rods (441) on any pressure strip (440) are rotatably connected to a slider (442); two sliders (442) on any pressure strip (440) are slidably engaged between two arms of adjacent U-shaped plates (430); a screw hole is opened on one side of any slider (442); and the inner side wall of the screw hole on any slider (442) is screwed together with the outer side wall of the adjacent adjusting screw (431).

8. The expansion and welding method for heat exchanger manufacturing according to claim 7, characterized in that: The cylinders (410) on the two extrusion mechanisms (400) are rotatably connected to a gear ring (420) at their opposite ends, and a gear (432) is fixedly sleeved on one end of each adjusting screw rod (431), and the gear teeth on each gear ring (420) are meshed with the gear teeth on adjacent multiple gears (432).

9. The expansion and welding method for heat exchanger manufacturing according to claim 7, characterized in that: A slide rail (450) is provided below the two cylinders (410), and a moving rod (451) is slidably engaged inside the two slide rails (450), the tops of the two moving rods (451) are fixedly connected to a fixing ring, and the inner side walls of the two fixing rings are rotatably sleeved with the outer side walls of the two cylinders (410), and both ends of the two slide rails (450) are fixedly connected to a hydraulic cylinder (452), and the movable ends of the two hydraulic cylinders (452) are fixedly connected to the two moving rods (451).

10. The expansion and welding method for heat exchanger manufacturing according to claim 7, characterized in that: Any pressure strip (440) is arc-shaped, any pressure strip (440) is a hollow structure, and any pressure strip (440) is provided with a magnet inside.

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