A forming process for spiral heat exchange tube

Abstract

The present invention discloses a forming process of a spiral heat exchange tube, comprising the following steps: heating a magnesium alloy billet by a three-stage low-temperature heating process, then heating the mold and then performing spiral extrusion to obtain a spiral heat exchange tube; bending and shaping the spiral heat exchange tube, adjusting the height of the first limiting axis according to the diameter of the spiral heat exchange tube, then placing multiple spiral heat exchange tubes between the first limiting axis and the second limiting axis, then placing a base filled with multiple spiral heat exchange tubes on the lower bracket, then fixing the base, and then controlling the operation of the first cylinder to drive the bending plate to rotate along the movable mounting seat, and by rotating the bending plate, the spiral heat exchange tube is bent and formed. By improving the bending and forming process, the present invention can not only place spiral heat exchange tubes of different diameters according to process requirements, but also place multiple spiral heat exchange tubes and perform bending and forming operations at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange tubes, and in particular to a forming process of a spiral heat exchange tube. Background Art

[0002] The heat exchange tube is one of the components of the heat exchanger, placed inside the cylinder, and used for heat exchange between two media;

[0003] Chinese patent CN103302121B discloses a new type of energy-saving heat exchanger magnesium alloy spiral tube. Its preparation process is: first, the chemical composition of the magnesium alloy is proportioned and smelted into a magnesium alloy billet; then the billet is heated by a three-stage heating process, and then the mold is heated and spiral extrusion is performed to achieve one-time molding of the spiral tube, and finally it is cut, manually trimmed, inspected, packaged and sent to the warehouse. Since the one-time spiral extrusion molding of the spiral tube is achieved by the extrusion process, the technology is advanced and the process is simplified, which improves production efficiency, reduces the weight of the whole machine, reduces processing costs, and has good energy-saving effects. It has low density, good thermal conductivity, easy forming, light weight and good shielding performance. It has heat resistance, high corrosion resistance, shock absorption resistance, good thermal conductivity, processing costs, good energy-saving effects, improved use efficiency, reduced operating costs, extended service life, reduced processing costs, significant energy-saving effects, and greatly improved product quality.

[0004] In the prior art, when a spiral heat exchange tube is bent and formed, a bending wheel is usually used to rotate to achieve the effect of bending the heat exchange tube. However, this method cannot bend and form multiple spiral heat exchange tubes at the same time, thereby affecting the overall progress of the spiral heat exchange tube forming. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems of the above-mentioned background technology and propose a forming process for a spiral heat exchange tube. By improving the bending forming process, the present invention can not only place spiral heat exchange tubes of different diameters according to process requirements, but also place multiple spiral heat exchange tubes and perform bending forming operations at the same time.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A forming process for a spiral heat exchange tube comprises the following steps:

[0008] Step 1: The magnesium alloy billet is heated using a three-stage heating process, and then the mold is heated before spiral extrusion to obtain a spiral heat exchange tube;

[0009] Step 2: Bend and shape the spiral heat exchange tube in step 1. According to the diameter of the spiral heat exchange tube, operate the telescopic rod to adjust the height of the first limit axis. Then, place multiple spiral heat exchange tubes between the first limit axis and the second limit axis. Then place the base filled with multiple spiral heat exchange tubes on the lower bracket, and then fix the base. Then, by controlling the operation of the first cylinder, drive the bending plate to rotate along the movable mounting seat. By rotating the bending plate, the spiral heat exchange tube is bent and formed.

[0010] As a further solution of the present invention, the base is fixed in the following manner: by controlling the operation of the second cylinder, the base plate is driven to move downward, and the fixing block is inserted into the fixing hole on the base.

[0011] As a further solution of the present invention: the bent plate is a rectangular plate.

[0012] As a further solution of the present invention: one first limiting shaft is provided, two second limiting shafts are provided, and the first limiting shaft is located in the middle of the two second limiting shafts.

[0013] As a further solution of the present invention: the height of the first limiting axis is higher than the height of the second limiting axis.

[0014] As a further solution of the present invention: a positioning column is provided between the two bent plates, and the positioning column is adapted to the positioning hole on the base.

[0015] As a further solution of the present invention: the positioning column is a cylindrical or square structure.

[0016] Beneficial effects of the present invention:

[0017] The present invention prepares a spiral heat exchange tube that can be directly used through stretching and bending. By improving the bending forming process, the present invention can not only place spiral heat exchange tubes of different diameters according to process requirements, but also place multiple spiral heat exchange tubes and perform bending forming operations at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 It is a flowchart of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the molding device of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the bending mechanism of the present invention;

[0022] Figure 4 This is a schematic structural diagram of the heat exchange tube placement component of the present invention;

[0023] Figure 5 It is a top view of the heat exchange tube placement component of the present invention.

[0024] In the figure: 1. Lower bracket; 2. Upper bracket; 3. Bending mechanism; 4. Fixing mechanism; 5. Mounting plate; 6. First cylinder; 7. Bending plate; 8. Movable mounting seat; 9. Positioning column; 10. Second cylinder; 11. Limit rod; 12. Bottom plate; 13. Fixing block; 14. Base; 15. Positioning hole; 16. Telescopic rod; 17. First limiting axis; 18. Vertical rod; 19. Second limiting axis; 20. Fixing hole. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making any creative efforts shall fall within the scope of protection of the present invention.

[0026] Example 1

[0027] See also Figure 1 As shown, the present invention is a forming process of a spiral heat exchange tube, comprising the following steps:

[0028] Step 1: The magnesium alloy billet is heated using a three-stage heating process, and then the mold is heated before spiral extrusion is performed to achieve one-time forming of the spiral tube to obtain a spiral heat exchange tube;

[0029] Step 2: Bend and shape the spiral heat exchange tube in step 1. According to the diameter of the spiral heat exchange tube, operate the telescopic rod 16 to adjust the height of the first limit axis 17. Then, place multiple spiral heat exchange tubes between the first limit axis 17 and the second limit axis 19. Then, place the base 14 filled with multiple spiral heat exchange tubes on the lower bracket 1. By controlling the second cylinder 10 to work, drive the bottom plate 12 to move downward, and insert the fixing block 13 into the fixing hole 20 on the base 14 to fix the base 14. Then, by controlling the first cylinder 6 to work, drive the bending plate 7 to rotate along the movable mounting seat 8. By rotating the bending plate 7, the spiral heat exchange tube is bent and formed.

[0030] Example 2

[0031] See also Figure 2-5 As shown, a forming device for a spiral heat exchange tube includes a lower bracket 1, an upper bracket 2, a bending mechanism 3, and a fixing mechanism 4;

[0032] An upper bracket 2 is provided on the lower bracket 1, a bending mechanism 3 is provided on the lower bracket 1, a fixing mechanism 4 is provided on the upper bracket 2, and a heat exchange tube placement piece is provided on the bending mechanism 3;

[0033] Among them, the bending mechanism 3 includes a mounting plate 5, a first cylinder 6, a bending plate 7, a movable mounting seat 8, and a positioning column 9; two first cylinders 6 are symmetrically arranged along the center line of the lower bracket 1, the bottom surface of the lower bracket 1 is provided with a mounting plate 5, the first cylinder 6 is movably arranged on the mounting plate 5, and a movable mounting seat 8 is provided on the top surface of the lower bracket 1. The bending plate 7 is rotatably installed between the movable mounting seats 8, and the output end of the first cylinder 6 passes through the top surface of the lower bracket 1 and is movably connected to the bending plate 7;

[0034] A positioning column 9 is provided between the two bent plates 7. The positioning column 9 is a cylindrical or square structure and is installed on the lower bracket 1. The positioning column 9 cooperates with the heat exchange tube placement piece. Therefore, the setting of the positioning column 9 facilitates fixing the heat exchange tube placement piece on the lower bracket 1.

[0035] When the bending mechanism 3 is working, the first cylinder 6 is controlled to work, driving the bending plate 7 to rotate along the movable mounting seat 8. By rotating the bending plate 7, the spiral heat exchange tube is bent and formed to meet the needs of different production processes. Among them, the bending mechanism 3 has the advantages of simple structure and convenient operation. The bending plate 7 is preferably a rectangular plate, so when the spiral heat exchange tube is bent and formed, multiple spiral heat exchange tubes can be operated at the same time, thereby improving the overall efficiency of the spiral heat exchange tube forming;

[0036] The heat exchange tube placement member includes a base 14, a positioning hole 15, a telescopic rod 16, a first limiting axis 17, a vertical rod 18, and a second limiting axis 19; the volume of the base 14 is adapted to the volume reserved by the two bending plates 7, and a positioning hole 15 adapted to the positioning column 9 is provided at the bottom of the base 14. The first limiting axis 17 and the second limiting axis 19 are respectively provided above the top surface of the base 14. There is one first limiting axis 17 and two second limiting axes 19, and the first limiting axis 17 is located in the middle of the two second limiting axes 19; the height of the first limiting axis 17 is higher than the height of the second limiting axis 19;

[0037] The first limiting shaft 17 is provided with telescopic rods 16 at both ends and is mounted on the base 14 via the telescopic rods 16. The second limiting shaft 19 is provided with vertical rods 18 at both ends and is mounted on the base 14 via the vertical rods 18. By providing the telescopic rods 16, the height of the first limiting shaft 17 can be adjusted, thereby changing the distance between the first limiting shaft 17 and the second limiting shaft 19, so that spiral heat exchange tubes of different diameters can be placed between the first limiting shaft 17 and the second limiting shaft 19.

[0038] When using the heat exchange tube placement member, first operate the telescopic rod 16 according to the diameter of the spiral heat exchange tube to adjust the height of the first limiting axis 17, and then place multiple spiral heat exchange tubes between the first limiting axis 17 and the second limiting axis 19. Therefore, the heat exchange tube placement member can not only place spiral heat exchange tubes of different diameters according to process requirements, but also place multiple spiral heat exchange tubes and perform bending and forming operations at the same time;

[0039] The fixing mechanism 4 includes a second cylinder 10, a limiting rod 11, a bottom plate 12, and a fixing block 13. Two second cylinders 10 are provided, and are respectively located on both sides of the top surface of the upper bracket 2. The output end of the second cylinder 10 passes through the upper bracket 2 and is connected to the bottom plate 12. A fixing block 13 is provided on the bottom surface of the bottom plate 12. Limiting rods 11 are respectively provided on both sides of the top surface of the bottom plate 12. The limiting rods 11 pass through the upper bracket 2 and are slidably connected to the upper bracket 2.

[0040] The base 14 is provided with a fixing hole 20 adapted to the fixing block 13;

[0041] When the fixing mechanism 4 is working, the second cylinder 10 is controlled to work, driving the bottom plate 12 to move downward, and the fixing block 13 is inserted into the fixing hole 20 on the base 14, thereby completing the fixation of the base 14 and ensuring the stability of the spiral heat exchange tube during bending.

[0042] The working principle of the present invention is as follows: a spiral heat exchange tube that can be directly used is prepared by stretching and bending. By improving the bending forming process, the present invention can not only place spiral heat exchange tubes of different diameters according to process requirements, but also place multiple spiral heat exchange tubes and perform bending forming operations at the same time.

[0043] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A forming process for a spiral heat exchange tube, characterized in that: The following steps are involved: Step 1: The magnesium alloy billet is heated using a three-stage heating process, and then the mold is heated before spiral extrusion to obtain a spiral heat exchange tube; Step 2: Bend and shape the spiral heat exchange tube in step 1. According to the diameter of the spiral heat exchange tube, operate the telescopic rod (16) to adjust the height of the first limiting shaft (17). Then, place multiple spiral heat exchange tubes between the first limiting shaft (17) and the second limiting shaft (19). Then, place the base (14) filled with multiple spiral heat exchange tubes on the lower bracket (1). Then, fix the base (14). Then, control the operation of the first cylinder (6) to drive the bending plate (7) to rotate along the movable mounting seat (8). By rotating the bending plate (7), the spiral heat exchange tube is bent and formed. The base (14) is fixed in the following manner: by controlling the second cylinder (10) to operate, the base plate (12) is driven to move downward, and the fixing block (13) is inserted into the fixing hole (20) on the base (14); The bending plate (7) is a rectangular plate; One first limiting shaft (17) is provided, two second limiting shafts (19) are provided, and the first limiting shaft (17) is located in the middle of the two second limiting shafts (19); The height of the first limiting axis (17) is higher than the height of the second limiting axis (19); A positioning column (9) is provided between the two bending plates (7), and the positioning column (9) is adapted to a positioning hole (15) on the base (14); The positioning column (9) is a cylindrical or square structure.

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