Single tube reducing processing equipment and processing method

Abstract

The application discloses a single-pipe reducing processing equipment, which comprises a rack, a buckling unit for buckling processing on one end of a pipe, so that a buckling head is formed on the one end of the pipe, a straightening unit for straightening the pipe, a necking die unit located on one side of the straightening unit, the necking die unit comprising a necking die, a reducing hole being arranged on the necking die, a taper being arranged on one side of the reducing hole, and the diameter of the reducing hole being larger than the maximum width of the buckling head, the pipe passing through the reducing hole, an oil injection mechanism being arranged on the necking die for oil injection to the pipe, a die clamping and feeding unit located on the side of the necking die unit away from the straightening unit, for clamping and moving the pipe, and a chipless cutting unit for cutting the pipe.

Description

Technical Field

[0001] This invention relates to the field of pipe fitting processing technology, and in particular to a single-pipe diameter reduction processing equipment and processing method. Background Technology

[0002] In traditional pipe fittings, when undergoing diameter reduction processing, one end of the fitting is first passed through the diameter reduction hole on the reducing die. After passing through the reducing hole, the fitting is clamped at one end by a pipe pulling device and pulled to move the fitting, allowing it to gradually pass through the reducing hole. The diameter of the reducing hole is smaller than the outer diameter of the fitting, and the reducing die compresses the outer wall of the fitting. After passing through the reducing hole, the fitting achieves the diameter reduction function, and the compression increases the hardness of the outer wall of the fitting.

[0003] However, before actual processing, one end of the pipe fitting needs to be manually passed through the reducing hole on the reducing die before the pipe fitting can be clamped and pulled by the pipe pulling device. The diameter of the reducing hole is smaller than the outer diameter of the pipe fitting, making it difficult for the pipe fitting to pass through the reducing hole. Secondly, traditional pipe fitting reducing processing equipment does not have pipe fitting cutting function and has a single function. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a single-tube diameter reduction processing equipment and processing method.

[0005] The objective of this invention is achieved through the following technical solution: a single-tube diameter reduction processing device, comprising:

[0006] frame;

[0007] A crimping unit is used to crimp one end of a pipe fitting, forming a crimping head at one end of the fitting.

[0008] The straightening unit is used to straighten pipe fittings;

[0009] The necking and drawing unit is located on one side of the straightening unit. The necking and drawing unit includes a necking die, which has a necking hole. A tapered opening is provided on one side of the necking hole. The diameter of the necking hole is larger than the maximum width of the crimping head. The pipe passes through the necking hole. The necking die is provided with an oil spraying mechanism for spraying oil onto the pipe.

[0010] The clamping and feeding unit is located on the side of the constriction and pulling unit away from the straightening unit, and is used to clamp the pipe fitting and drive the pipe fitting to move.

[0011] The chipless cutting unit is located on the side of the clamping and feeding unit away from the necking and pulling unit, and is used to cut pipe fittings.

[0012] Preferably, the clamping unit includes an outer plate assembly and a clamping sliding component assembly. The inner side of the outer plate assembly is provided with at least three limiting blocks, and a guide groove is formed between two adjacent limiting blocks. The clamping sliding component assembly includes a plurality of clamping sliding components, which are slidably connected in the guide grooves and arranged in a rotationally symmetrical manner. The outer side of the outer plate assembly is provided with a clamping cylinder corresponding to the clamping sliding component. One end of the clamping sliding component is connected to the clamping cylinder, and the other end of the clamping sliding component is provided with a clamping block, which forms a clamping groove. The clamping sliding component is moved simultaneously by being driven by the clamping cylinder.

[0013] Preferably, the straightening unit includes a base, on which a guide roller group, a vertical straightening roller group, and a horizontal straightening roller group are provided.

[0014] Preferably, the guide roller group consists of two guide rollers, the vertical straightening roller group consists of four vertical straightening rollers, and the horizontal straightening roller group consists of four horizontal straightening rollers.

[0015] Preferably, the oil spraying mechanism includes an annular oil channel, an oil spray hole, and an oil inlet channel disposed on the conical mold. One end of the oil spray hole is connected to the annular oil channel, and the other end of the oil spray hole penetrates the surface of the conical opening. One end of the oil inlet channel is connected to the annular oil channel.

[0016] The outer side of the necking die is equipped with an oil inlet control valve body and a heat reaction plate. The oil inlet control valve body is equipped with a guide groove, and fixed valve holes are provided on both sides of the guide groove, with the fixed valve holes on both sides corresponding to each other. A movable valve block is slidably connected in the guide groove, and the movable valve block is equipped with a movable valve hole. One end of the heat reaction plate is connected to the necking die, and the movable valve block is equipped with a groove corresponding to the heat reaction plate. The end of the heat reaction plate away from the necking die extends into the groove on the movable valve block. One fixed valve hole on one side of the oil inlet control valve body is connected to the oil inlet channel through a connecting pipe, and the fixed valve hole on the other side of the oil inlet control valve body is connected to the oil inlet pipe.

[0017] The heat-reacting plate consists of a first metal layer and a second metal layer. The coefficient of thermal expansion of the first metal layer is greater than that of the second metal layer. When the temperature of the shrinking die rises, the heat-reacting plate bends to one side, causing the movable valve block to move and increasing the overlap between the movable valve hole and the fixed valve hole on the movable valve block.

[0018] Preferably, the clamping die feeding unit includes a servo moving device, on which a first clamping die and a second clamping die are provided. The second clamping die is located on the side of the first clamping die away from the constriction and drawing die unit. The first clamping die is provided with two opposing first clamping blocks, which are used to clamp the clamping head on the pipe fitting. The second clamping die is provided with two opposing second clamping blocks, which are used to clamp the pipe fitting.

[0019] Preferably, the opposing surfaces of the two first clamping blocks are the first clamping surfaces, which are flat and have strip-shaped protrusions; the opposing surfaces of the two second clamping blocks are the second clamping surfaces, which have clamping grooves.

[0020] A processing method for a single-tube diameter reduction processing device includes the following specific steps:

[0021] Step 1) The crimping unit crimps one end of the pipe fitting to be processed, forming a crimping head at one end. During the crimping process, the pipe fitting is inserted into the crimping groove on the crimping unit. The crimping cylinder simultaneously drives each sliding crimping component to move towards the center of the crimping unit. Pressure is applied to the outer surface of the pipe fitting by the crimping block. The pipe fitting deforms under the pressure of the crimping block to form a crimping head. Then the crimping cylinder resets, pulling the crimping head out of the crimping groove.

[0022] Step 2) The end of the pipe fitting with the crimping head first passes through the straightening unit, and then through the diameter reduction hole on the diameter reduction die;

[0023] Step 3) When the first and second clamping dies on the servo moving device are positioned near the end of the necking and drawing die unit, they are in the first feeding position; when they are positioned away from the necking and drawing die unit, they are in the second feeding position. The clamping die feeding unit drives the tube to move towards the chipless cutting unit. The specific steps are as follows:

[0024] S1: The first clamping die at the first feeding position clamps the clamping head and drives the first clamping die to move to the second feeding position through the servo moving device, causing the pipe to move towards the chipless cutting unit; when the first clamping die reaches the second feeding position, the first clamping die releases the pipe and then returns to the first feeding position;

[0025] S2: The second clamping mold clamps the pipe fitting, and the servo moving device drives the second clamping mold to move to the second feeding position, causing the pipe fitting to move towards the chipless cutting unit; after the second clamping mold reaches the second feeding position, the second clamping mold releases the pipe fitting, and then the second clamping mold returns to the first feeding position;

[0026] S3: Repeat step S2 to keep the pipe moving toward the chipless cutting unit;

[0027] Step 4) Cut the pipe fitting using the chipless cutting unit.

[0028] The beneficial effects of this invention are as follows: Before reducing the diameter of the pipe fitting, this invention first uses a crimping unit to crimp one end of the pipe fitting, forming a crimping head at the end of the pipe fitting. The maximum width of the crimping head is smaller than the diameter of the reducing hole, thus facilitating the passage of one end of the pipe fitting through the reducing hole and solving the problem of one end of the pipe fitting being difficult to pass through the reducing hole. This invention also includes a chipless cutting unit, which cuts the pipe fitting, enabling this invention to simultaneously perform pipe reducing and cutting functions, thus solving the problem of the single function of traditional pipe reducing equipment. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of the present invention.

[0030] Figure 2 This is a schematic diagram of the crimping unit.

[0031] Figure 3 A schematic diagram of the crimping unit after removing the outer plate assembly and the crimping cylinder.

[0032] Figure 4 This is a front view of the crimping unit after removing the outer panel assembly.

[0033] Figure 5 This is a structural schematic diagram of the snap-fit ​​sliding component assembly.

[0034] Figure 6 This is a schematic diagram of the clamping block.

[0035] Figure 7 This is a schematic diagram of the structure of one end of the pipe fitting after crimping.

[0036] Figure 8 This is a cross-sectional view of the crimping head.

[0037] Figure 9 This is a structural diagram of the alignment unit.

[0038] Figure 10 This is a schematic diagram of the constriction die unit.

[0039] Figure 11 This is a cross-sectional view of the necking die.

[0040] Figure 12 for Figure 11 Enlarged view of section A.

[0041] Figure 13 This is a schematic diagram of the structure of the thermal reaction plate.

[0042] Figure 14 This is a schematic diagram of the local structure at the location of the thermal reaction plate when the temperature of the shrinking mold is too high.

[0043] Figure 15This is a schematic diagram of the local structure at the location of the thermal reaction sheet when the temperature of the shrinking mold is too low.

[0044] Figure 16 This is a schematic diagram of the clamping mold feeding unit.

[0045] Figure 17 This is a schematic diagram of the first clamping mold.

[0046] Figure 18 This is a schematic diagram of the structure of the first clamping block.

[0047] Figure 19 This is a schematic diagram of the second clamping mold.

[0048] Figure 20 This is a schematic diagram of the second clamping block.

[0049] In the diagram: 1. Frame; 2. Crimping Unit; 21. Outer Panel Assembly; 22. Crimping Cylinder; 23. Limiting Block; 24. Crimping Sliding Part; 25. Crimping Block; 26. Crimping Groove; 3. Straightening Unit; 31. Base; 32. Guide Roller; 33. Vertical Straightening Roller; 34. Horizontal Straightening Roller; 4. Narrowing Die Unit; 41. Mounting Base; 42. Narrowing Die; 43. Bolt Hole; 44. Oil Injection Hole; 45. Annular Oil Channel; 46. Oil Inlet Control Valve Body; 47. Guide Groove; 48. Oil Inlet Channel; 49. Movable Valve 410. Movable valve hole, 411. Fixed valve hole, 412. Oil inlet pipe, 413. Heat reaction plate, 414. First metal layer, 415. Second metal layer, 416. Connecting pipe, 417. Groove, 418. Reduction hole, 419. Conical opening, 5. Clamping die feeding unit, 51. Servo moving device, 52. First clamping die, 53. Second clamping die, 54. First clamping block, 55. Strip-shaped protrusion, 56. Second clamping block, 57. Clamping groove, 6. Chipless cutting unit, 7. Hydraulic station, 8. Pipe fitting, 81. Crimping head. Detailed Implementation

[0050] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0051] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0052] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0053] like Figure 1-20 As shown, a single-pipe diameter reduction processing equipment includes a frame 1, a crimping unit 2, a straightening unit 3, a diameter reduction drawing unit 4, a clamping and feeding unit 5, a chipless cutting unit 6, and a hydraulic station 7.

[0054] The crimping unit 2 is used to crimp one end of the pipe fitting 8, forming a crimping head 81 at one end of the pipe fitting 8. Specifically, the crimping unit 2 includes an outer plate assembly 21 and a crimping sliding component assembly. The outer plate assembly 21 consists of six outer plates and has a cuboid shape. At least three limiting blocks 23 are provided on the inner side of the outer plate assembly 21; in this embodiment, four limiting blocks 23 are provided, arranged in a rotationally symmetrical manner. A guide groove is formed between two adjacent limiting blocks 23. The crimping sliding component assembly includes several crimping sliding components 24, the number of which is the same as the number of limiting blocks 23. In this embodiment, four crimping sliding components 24 are provided. The crimping sliding components 24 are slidably connected in the guide grooves and arranged in a rotationally symmetrical manner. The outer panel assembly 21 has a clamping cylinder 22 corresponding to the clamping sliding component 24 on its outer side. One end of the clamping sliding component 24 is connected to the clamping cylinder 22, and the other end of the clamping sliding component 24 has a clamping block 25. The clamping block 25 encloses and forms a clamping groove 26, which has a square cross-section. The clamping cylinder 22 drives the clamping sliding component 24 to move simultaneously. When the clamping cylinder 22 drives the clamping sliding component 24 to move towards the center of the clamping unit, the clamping groove 26 gradually shrinks; when the clamping cylinder 22 drives the clamping sliding component 24 to move towards the outer side of the clamping unit, the clamping groove 26 gradually expands.

[0055] During the crimping process by the crimping unit 2, the pipe fitting 8 is inserted into the crimping groove 26 on the crimping unit. The crimping cylinder 22 simultaneously drives each sliding crimping component 24 to move towards the center of the crimping unit 2. The crimping block 25 applies pressure to the outer surface of the pipe fitting 8. The pipe fitting 8 deforms under the pressure of the crimping block 25 to form a crimping head 81. The cross-section of the crimping head 81 is square.

[0056] The straightening unit 3 is used to straighten the pipe fitting 8. Specifically, the straightening unit 3 includes a base 31, on which a guide roller assembly 32, a vertical straightening roller assembly 33, and a horizontal straightening roller assembly 34 are provided. The guide roller assembly 32 consists of two guide rollers, the vertical straightening roller assembly 33 consists of four vertical straightening rollers arranged on the same vertical plane, and the horizontal straightening roller assembly 34 consists of four horizontal straightening rollers arranged on the same horizontal plane. When straightening the pipe fitting 8 through the straightening unit 3, the pipe fitting passes through the guide roller assembly 32, the vertical straightening roller assembly 33, and the horizontal straightening roller assembly 34 in sequence.

[0057] The necking and drawing mold unit 4 is located on one side of the straightening unit 3. The necking and drawing mold unit 4 includes a mounting base 41 and a necking mold 42. The necking mold 42 is annular and has bolt holes 43. The necking mold 42 is fixedly mounted on the mounting base 41 by bolts. The necking mold 42 has a necking hole 418, and a tapered opening 419 is provided on one side of the necking hole 418. The diameter of the necking hole 418 is larger than the maximum width of the crimping head 81. The pipe fitting 8 passes through the necking hole 418, and the necking mold 42 is equipped with an oil spraying mechanism for spraying oil onto the pipe fitting 8.

[0058] Specifically, the oil spraying mechanism includes an annular oil channel 45, an oil spray hole 44, and an oil inlet channel 48 disposed on the conical die 42. One end of the oil spray hole 44 is connected to the annular oil channel 45, and the other end of the oil spray hole 44 penetrates the surface of the conical opening 419. One end of the oil inlet channel 48 is connected to the annular oil channel 45, and the other end of the oil inlet channel 48 penetrates the outer surface of the conical die 42.

[0059] The outer side of the necking die 42 is provided with an oil inlet control valve body 46 and a heat reaction plate 413. The oil inlet control valve body 46 is provided with a guide groove 47, which is arranged vertically. Fixed valve holes 411 are provided on both sides of the guide groove 47, and the fixed valve holes 411 on both sides correspond to each other. A movable valve block 49 is slidably connected in the guide groove 47. The two outer side walls of the movable valve block 49 are in close contact with the two inner side walls of the guide groove 47, and the movable valve block 49 can slide up and down in the guide groove 47. The movable valve block 49 is provided with a movable valve hole 410. One end of the heat reaction plate 43 is connected to the necking die 42. The movable valve block 49 is provided with a groove 417 corresponding to the heat reaction plate 413. The end of the heat reaction plate 413 away from the necking die 42 extends into the groove 417 on the movable valve block 49. One side of the fixed valve hole 411 on the oil inlet control valve body 46 is connected to the oil inlet channel 48 through the connecting pipe 416, and the other side of the fixed valve hole 411 on the oil inlet control valve body 46 is connected to the oil inlet pipe 412, which is connected to the oil supply device.

[0060] The heat-reacting plate 413 consists of a first metal layer 414 and a second metal layer 415. The coefficient of thermal expansion of the first metal layer 414 is greater than that of the second metal layer 415, and the first metal layer 414 is located above the second metal layer 415. When the temperature of the necking die 42 rises, the heat-reacting plate bends to one side, causing the movable valve block 49 to move, increasing the overlap between the movable valve hole 410 and the fixed valve hole 411 on the movable valve block 49. When the pipe 8 passes through the necking die 42, a large amount of heat is generated due to the significant friction between the outer wall of the pipe and the inner wall of the necking hole, causing the temperature of the pipe and the necking die to rise. This also makes it easy to scratch the pipe and reduce the service life of the necking die. The present invention sprays oil onto the surface of the pipe through an oil spraying mechanism. The lubricating oil provided by the oil supply device is sprayed out through the oil spraying hole and sprayed onto the position between the pipe and the necking die. On the one hand, it can lubricate the surface of the pipe, reduce friction, reduce scratches on the pipe, and improve the service life of the die. On the other hand, it can cool down the necking die and the pipe. The movable valve hole 410 and the fixed valve hole 411 are partially offset. The degree of overlap between the movable valve hole 410 and the fixed valve hole 411 can be adjusted by moving the movable valve block 49, thereby adjusting the fuel injection quantity.

[0061] When the temperature of the necking die 42 and the pipe fitting 8 rises, heat transfer occurs between the necking die 42 and the heat-reacting plate 413, causing the temperature of the heat-reacting plate 413 to rise as well. Since the coefficient of thermal expansion of the first metal layer 414 is greater than that of the second metal layer 415, the expansion of the first metal layer 414 is greater than that of the second metal layer 415, causing the heat-reacting plate 413 to bend downwards. This causes the movable valve block 49 to move downwards, increasing the overlap between the movable valve hole 410 and the fixed valve hole 411 on the movable valve block 49. This increases the actual oil flow area and increases the oil injection volume. By increasing the oil injection volume, the cooling effect on the pipe fitting and the necking die is improved, thereby suppressing the temperature rise of the pipe fitting and the necking die and preventing the temperature from becoming too high. Conversely, when the temperature of the shrinking die 42 and the pipe fitting 8 drops, the heat reaction plate 413 bends upward, causing the movable valve block 49 to move upward, reducing the overlap between the movable valve hole 410 and the fixed valve hole 411 on the movable valve block 49, thereby reducing the actual oil flow area, which in turn reduces the amount of oil injected and lowers the working pressure of the lubricating oil circulation system.

[0062] The clamping and feeding unit 5 is located on the side of the necking and pulling die unit 4 away from the straightening unit 3, and is used to clamp the pipe fitting 8 and drive the pipe fitting 8 to move. The clamping and feeding unit 5 includes a servo moving device 51, on which a first clamping die 52 and a second clamping die 53 are provided. The second clamping die 53 is located on the side of the first clamping die 52 away from the necking and pulling die unit 4. The servo moving device 51 drives the first clamping die 52 and the second clamping die 53 to move synchronously.

[0063] The first clamping mold 52 has two opposing first clamping blocks 54. The two first clamping blocks 54 are driven to move relative to each other by a clamping drive mechanism on the first clamping mold 52. The two first clamping blocks 54 are used to clamp the clamping head 81 on the pipe fitting 8. The opposing surfaces of the two first clamping blocks 54 are first clamping surfaces. The first clamping surfaces are provided with strip-shaped protrusions 55. The strip-shaped protrusions 55 are arranged vertically and have a triangular cross-section.

[0064] The second clamping mold 53 is provided with two opposing second clamping blocks 56. The two second clamping blocks 56 are driven to move relative to each other by the clamping drive mechanism on the second clamping mold 53. The two second clamping blocks 56 are used to clamp the pipe fitting 8. The opposing surfaces of the two second clamping blocks 56 are the second clamping surfaces, and the second clamping surfaces are provided with clamping grooves 57. The cross-section of the clamping grooves 57 is semi-circular.

[0065] The chipless cutting unit 6 is located on the side of the clamping and feeding unit 5 away from the necking and pulling unit 4, and is used to cut the pipe fitting 8. In this invention, the chipless cutting unit 6 adopts existing technology.

[0066] Hydraulic station 7 provides hydraulic power to hydraulic components such as clamping cylinder 22.

[0067] When using this invention, the following specific steps are included:

[0068] Step 1) The crimping unit crimps one end of the pipe fitting to be processed, forming a crimping head at one end of the pipe fitting. During the crimping process, the pipe fitting is inserted into the crimping groove on the crimping unit. The crimping cylinder simultaneously drives each sliding crimping component to move towards the center of the crimping unit. Pressure is applied to the outer surface of the pipe fitting by the crimping block. The pipe fitting deforms under the pressure of the crimping block to form a crimping head. Then the crimping cylinder resets and pulls the crimping head out of the crimping groove.

[0069] Step 2) The end of the fitting with the crimping head first passes through the straightening unit, and then through the reducing hole on the reducing die.

[0070] Step 3) When the first and second clamping dies on the servo moving device are positioned near the end of the necking and drawing die unit, they are in the first feeding position; when they are positioned away from the necking and drawing die unit, they are in the second feeding position. The clamping die feeding unit drives the tube to move towards the chipless cutting unit. The specific steps are as follows:

[0071] S1: The first clamping die at the first feeding position clamps the clamping head and drives the first clamping die to move to the second feeding position through the servo moving device, causing the pipe to move towards the chipless cutting unit; when the first clamping die reaches the second feeding position, the first clamping die releases the pipe and then returns to the first feeding position;

[0072] S2: The second clamping mold clamps the pipe fitting, and the servo moving device drives the second clamping mold to move to the second feeding position, causing the pipe fitting to move towards the chipless cutting unit; after the second clamping mold reaches the second feeding position, the second clamping mold releases the pipe fitting, and then the second clamping mold returns to the first feeding position;

[0073] S3: Repeat step S2 to continuously move the pipe toward the chipless cutting unit.

[0074] Step 4) The pipe is cut into fixed length segments by using a chipless cutting unit.

[0075] Before reducing the diameter of the pipe fitting, this invention first uses a crimping unit to crimp one end of the fitting, forming a crimping head at the end. The maximum width of the crimping head is smaller than the diameter of the reducing hole, thus facilitating the passage of one end of the fitting through the reducing hole and solving the problem of the fitting's difficulty in passing through the reducing hole. This invention also includes a chipless cutting unit to cut the fitting, enabling it to simultaneously perform pipe reducing and cutting functions, overcoming the limitation of traditional pipe reducing equipment having only one function.

[0076] This invention is not limited to the preferred embodiments described above. Anyone can derive other products in various forms under the guidance of this invention. However, regardless of any changes in shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A single-tube diameter reduction processing device, characterized in that, include: frame; A crimping unit is used to crimp one end of a pipe fitting to form a crimping head. The crimping unit includes an outer plate assembly and a crimping sliding component assembly. The inner side of the outer plate assembly is provided with at least three limiting blocks, and a guide groove is formed between two adjacent limiting blocks. The crimping sliding component assembly includes several crimping sliding components, which are slidably connected in the guide grooves and arranged in a rotationally symmetrical manner. A crimping cylinder corresponding to the crimping sliding component is provided on the outer side of the outer plate assembly. One end of the crimping sliding component is connected to the crimping cylinder, and the other end of the crimping sliding component is provided with a crimping block, which forms a crimping groove. The pressing sliding component is moved simultaneously by the pressing cylinder; The straightening unit is used to straighten pipe fittings; A necking and drawing die unit is located on one side of the straightening unit. The necking and drawing die unit includes a necking die with a necking hole. A tapered opening is provided on one side of the necking hole, and the diameter of the necking hole is larger than the maximum width of the crimping head. The pipe passes through the necking hole. The necking die is provided with an oil spraying mechanism for spraying oil onto the pipe. The oil spraying mechanism includes an annular oil channel, an oil spray hole, and an oil inlet channel provided on the necking die. One end of the oil spray hole is connected to the annular oil channel, and the other end of the oil spray hole penetrates the surface of the tapered opening. One end of the oil inlet channel is connected to the annular oil channel. The outer side of the necking die is equipped with an oil inlet control valve body and a heat reaction plate. The oil inlet control valve body is equipped with a guide groove, and fixed valve holes are provided on both sides of the guide groove, with the fixed valve holes on both sides corresponding to each other. A movable valve block is slidably connected in the guide groove, and the movable valve block is equipped with a movable valve hole. One end of the heat reaction plate is connected to the necking die, and the movable valve block is equipped with a groove corresponding to the heat reaction plate. The end of the heat reaction plate away from the necking die extends into the groove on the movable valve block. One fixed valve hole on one side of the oil inlet control valve body is connected to the oil inlet channel through a connecting pipe, and the other fixed valve hole on the oil inlet control valve body is connected to the oil inlet pipe. The heat-reacting plate consists of a first metal layer and a second metal layer. The coefficient of thermal expansion of the first metal layer is greater than that of the second metal layer. When the temperature of the shrinking die rises, the heat-reacting plate bends to one side, causing the movable valve block to move, thus increasing the overlap between the movable valve hole and the fixed valve hole on the movable valve block. The clamping and feeding unit is located on the side of the constriction and pulling unit away from the straightening unit, and is used to clamp the pipe fitting and drive the pipe fitting to move. The chipless cutting unit is located on the side of the clamping and feeding unit away from the necking and pulling unit, and is used to cut pipe fittings.

2. The single-tube diameter reduction processing equipment according to claim 1, characterized in that, The straightening unit includes a base, on which a guide roller group, a vertical straightening roller group, and a horizontal straightening roller group are provided.

3. The single-tube diameter reduction processing equipment according to claim 2, characterized in that, The guide roller assembly consists of two guide rollers, the vertical straightening roller assembly consists of four vertical straightening rollers, and the horizontal straightening roller assembly consists of four horizontal straightening rollers.

4. The single-tube diameter reduction processing equipment according to claim 1, characterized in that, The clamping mold feeding unit includes a servo moving device, on which a first clamping mold and a second clamping mold are provided. The second clamping mold is located on the side of the first clamping mold away from the constriction and drawing mold unit. The first clamping mold is provided with two opposing first clamping blocks, which are used to clamp the clamping head on the pipe fitting. The second clamping mold is provided with two opposing second clamping blocks, which are used to clamp the pipe fitting.

5. The single-tube diameter reduction processing equipment according to claim 4, characterized in that, The opposing surfaces of the two first clamping blocks are the first clamping surfaces, which are flat and have strip-shaped protrusions; the opposing surfaces of the two second clamping blocks are the second clamping surfaces, which have clamping grooves.

6. A processing method based on the single-tube diameter reduction processing equipment according to claim 4, characterized in that, The specific steps include the following: Step 1) The crimping unit crimps one end of the pipe fitting to be processed, forming a crimping head at one end of the pipe fitting. During the crimping process, the pipe fitting is inserted into the crimping groove on the crimping unit. The crimping cylinder simultaneously drives each sliding crimping component to move towards the center of the crimping unit. The crimping block applies pressure to the outer surface of the pipe fitting. The pipe fitting deforms under the pressure of the crimping block to form a crimping head. Then the clamping cylinder resets, pulling the clamping head out of the clamping groove; Step 2) The end of the pipe fitting with the crimping head first passes through the straightening unit, and then through the diameter reduction hole on the diameter reduction die; Step 3) When the first and second clamping dies on the servo moving device are positioned near the end of the necking and drawing die unit, they are in the first feeding position; when they are positioned away from the necking and drawing die unit, they are in the second feeding position. The clamping die feeding unit drives the tube to move towards the chipless cutting unit. The specific steps are as follows: S1: The first clamping die at the first feeding position clamps the clamping head and drives the first clamping die to move to the second feeding position through the servo moving device, causing the pipe to move towards the chipless cutting unit; when the first clamping die reaches the second feeding position, the first clamping die releases the pipe and then returns to the first feeding position; S2: The second clamping mold clamps the pipe fitting, and the servo moving device drives the second clamping mold to move to the second feeding position, causing the pipe fitting to move towards the chipless cutting unit; after the second clamping mold reaches the second feeding position, the second clamping mold releases the pipe fitting, and then the second clamping mold returns to the first feeding position; S3: Repeat step S2 to keep the pipe moving toward the chipless cutting unit; Step 4) Cut the pipe fitting using the chipless cutting unit.

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