A method for preparing a flexible stainless steel refrigerant pipe

Abstract

The present invention belongs to the technical field of preparation of refrigerant pipes, and in particular to a method for preparing a flexible stainless steel refrigerant pipe, the preparation method comprising S4, internal leveling: using a leveling device to level the inside of the pipe after welding, to ensure that the inner and outer surfaces of the pipe are smooth, so as to facilitate subsequent processing and improve the quality of the pipeline. The method for preparing the flexible stainless steel refrigerant pipe, after the transmission motor controls the transmission gear to rotate, can transmit power to a plurality of rotating wheels through meshing with the transmission thread, so that the wheels rotate and drive the workpiece to be processed to rotate, thereby leveling the circumferential surface of the workpiece to be processed, and the polishing stone on its surface can polish the outer surface of the workpiece to be processed, to ensure that the inner and outer surfaces are smooth and flat.

Description

Technical Field

[0001] The invention relates to the technical field of refrigerant pipe preparation, and in particular to a method for preparing a flexible stainless steel refrigerant pipe. Background Art

[0002] Flexible stainless steel refrigerant pipes are widely used in air conditioning, refrigeration equipment, refrigerators and other industries as an important part of connecting various parts of the system. Its main function is to carry the flow of refrigerant and ensure the efficient operation of the refrigeration system. Compared with traditional copper or aluminum pipes, flexible stainless steel refrigerant pipes are gradually widely used in the refrigeration industry due to their excellent corrosion resistance, strong pressure resistance, good flexibility and high and low temperature resistance. Its production methods and technologies are constantly improved to meet market demand.

[0003] With the advancement of refrigeration technology, the requirements for refrigerant pipes are getting higher and higher. Not only do they require good corrosion resistance and pressure resistance, but they also need to be flexible enough to facilitate installation and bending, and to ensure long-term stable operation. Therefore, the manufacturing process of flexible stainless steel refrigerant pipes is gradually developing towards higher precision and lower cost. The quality requirements of flexible stainless steel refrigerant pipes are high, especially in terms of the inner wall finish of the pipe, surface treatment process and welding quality, which will directly affect the working efficiency and reliability of the refrigeration system.

[0004] Although there are many flexible stainless steel refrigerant pipe products on the market, the current production methods often have some technical bottlenecks, such as the difficulty in ensuring the smoothness of the inner and outer walls of the pipe, the uneven bendability and tensile properties of the pipe, and other problems. The production process of flexible stainless steel pipes is complicated and requires precise control of forming, welding, stretching, annealing and other links. Especially for pipes with high requirements for the inner wall, how to ensure that the inner and outer surfaces are smooth and flat while maintaining strength, and at the same time ensure that the leveling equipment can cover the leveling area of ​​the refrigerant pipe is a problem that needs to be solved urgently, so the invention solves the shortcomings of the above technical problems. Summary of the invention

[0005] Based on the above existing technical problems, the present invention proposes a method for preparing a flexible stainless steel refrigerant pipe.

[0006] The present invention provides a method for preparing a flexible stainless steel refrigerant pipe, the method comprising the following steps:

[0007] S1. Unwinding of steel strip: The raw material is stainless steel strip, which is first unwound by an unwinding machine in preparation for subsequent processing.

[0008] S2. Steel strip forming: The steel strip is processed into a tube blank according to the required shape and size through a forming machine to initially form the shape of the steel pipe.

[0009] S3. Argon arc welding: The formed steel strip is subjected to argon arc welding. The two sides of the steel strip are welded together through the argon arc welding process to form a tubular structure. During argon arc welding, the welding current is controlled between 80-125A.

[0010] S4. Internal leveling: Use leveling equipment to level the inside of the pipe after welding to ensure that the inner and outer surfaces of the pipe are smooth for subsequent processing and to improve the quality of the pipeline.

[0011] S5. Shape adjustment: After internal leveling, the stainless steel pipe enters the shaping process, and the upper, lower, left and right shaping rollers are used to finely adjust the shape of the stainless steel pipe to ensure that the outer roundness and flatness of the pipe meet the requirements.

[0012] S6. Online high-frequency annealing: High-frequency annealing is to heat the stainless steel pipe with high-frequency current to keep it at a high temperature for a certain period of time to improve the mechanical properties and toughness of the pipe. This process is usually carried out with gas protection to avoid oxidation. The electromagnetic frequency used for high-frequency annealing is 65-93kHz.

[0013] S7. Heat treatment: During the high-frequency annealing process, protective gas is used to protect the surface of the steel pipe to avoid oxidation and ensure the corrosion resistance of the pipe. Then after annealing, the pipe is quickly cooled by online water cooling to fix the organizational structure of the pipe and ensure its dimensional stability and mechanical properties.

[0014] S8. Eddy current flaw detection: The traction unit stretches the pipeline through mechanical traction to make its size meet the design requirements. Eddy current flaw detection technology is used to perform non-destructive testing on the pipeline to ensure that the pipeline has no internal defects and cracks. The frequency used for eddy current flaw detection is usually between 45-80kHz.

[0015] S9, Laser marking: Mark the pipeline to identify product batch, production date, and specification information for subsequent traceability and management.

[0016] S10, Finished pipe coiling: Finally, qualified steel pipes are coiled into coils, packaged and stored as finished pipes, ready to enter the subsequent processing link.

[0017] Preferably, the leveling equipment in S4 includes a CNC machine tool, a workpiece to be processed and an internal leveling core rod arranged inside the workpiece to be processed, the upper surface of the bottom plate of the CNC machine tool is provided with a supporting bottom plate for reciprocating movement, the upper surface of the supporting bottom plate is symmetrically distributed and fixedly connected with support columns, the upper surface of the support columns is fixedly connected with a mounting top plate, the upper surface of the bottom plate of the CNC machine tool is provided with a reciprocating mechanism, the upper surface of the supporting bottom plate is provided with a supporting rotating mechanism, the lower surface of the mounting top plate is provided with a material pressing mechanism, and both ends of the workpiece to be processed are provided with material clamping and conveying mechanisms.

[0018] Among them, the reciprocating mechanism includes two pulling cylinders arranged opposite to each other, both of which are installed on the upper surface of the base plate of the CNC machine tool, and the two pulling cylinders move intermittently and independently, thereby driving the supporting base plate to reciprocate in the horizontal direction.

[0019] Wherein, the supporting rotation mechanism comprises a rotating wheel, the outer surface of which contacts the outer surface of the lower end of the workpiece to be processed, and when the rotating wheel rotates, it drives the workpiece to be processed to rotate in a uniform circumferential direction.

[0020] Wherein, the pressing mechanism includes a pressing cylinder, which is fixedly mounted on the upper surface of the mounting top plate. When the piston rod of the pressing cylinder is pushed downward, pressure can be applied to the outer surface of the workpiece to be processed, thereby flattening its shape.

[0021] Wherein, the clamping and conveying mechanism comprises clamping rollers, and the clamping rollers adaptively clamp the outer edges of both sides of the workpiece to be processed, thereby trimming the outer surface.

[0022] Preferably, the reciprocating mechanism also includes a supporting guide rail symmetrically distributed and fixedly connected to the upper surface of the base plate of the CNC machine tool, the outer surface of the supporting guide rail is slidably clamped with a guide slider, the upper surface of the guide slider is fixedly connected to the lower surface of the supporting base plate, and the upper surface of the base plate of the CNC machine tool is symmetrically distributed and fixedly connected with a limit abutment plate, and the limit switch on the limit abutment plate is in sliding contact with one side surface of the supporting base plate.

[0023] Through the above technical scheme, in order to control the transportation of the workpiece to be processed and complete the processing, the support base plate can push the workpiece to be processed when it reciprocates horizontally on the outer surface of the support guide rail through the support of the guide slider. In order to control the moving stroke of the support base plate, the two pulling cylinders realize stroke control through the contact between the limit stop plate and the support base plate when they each pull the support base plate to move.

[0024] Preferably, the supporting rotating mechanism includes a mounting shell which is fixedly connected to the upper surface of the supporting base plate through a pad and is symmetrically distributed, and a plurality of rotating wheels are rotationally connected to the end surface of the mounting shell through a rotating shaft, and the outer surface of the rotating wheels is fixedly connected with polishing stones distributed in a circular array.

[0025] Through the above technical scheme, in order to enable the workpiece to be rotated circumferentially when being conveyed forward, thereby achieving uniform leveling of its inner and outer surfaces, the rotating wheels at both ends of the workpiece rotate synchronously when being leveled, thereby forcing the workpiece to be processed to rotate, and the polishing stone on its surface can polish the outer surface of the workpiece to be processed.

[0026] Preferably, the supporting rotation mechanism also includes a first pulley housing fixedly installed on one side surface of the mounting housing, a second pulley housing is fixedly connected to one side surface of the first pulley housing, the upper surface of the cushion block is rotatably connected to a transmission shaft through a supporting ear plate, the outer surfaces at both ends of the transmission shaft respectively extend to the corresponding interior of the second pulley housing, the upper surface of the supporting base plate is fixedly connected to a transmission motor, the outer surface of the output shaft of the transmission motor is fixedly sleeved with a transmission gear, the middle outer surface of the transmission shaft is fixedly sleeved with a transmission thread, and the transmission gear is meshed with the transmission thread.

[0027] Through the above technical scheme, in order to drive the rotating pulleys on the mounting shell to rotate synchronously, the pulley assembly in the first pulley shell will link the rotating shaft of the corresponding rotating pulley, and the pulley assembly in the second pulley shell will link the transmission shaft with the pulley assembly in the first pulley shell, so that after the transmission motor controls the rotation of the transmission gear, the power can be transmitted to multiple rotating pulleys through the engagement with the transmission thread, so that the rotation of the pulleys drives the workpiece to be processed to rotate.

[0028] Preferably, the supporting rotation mechanism also includes fixed rods that are symmetrically distributed and fixedly connected to the two side surfaces of the mounting shell, the surface of the fixed rod is hinged with a movable rod through a torsion spring shaft, the lower surface of the free end of the movable rod is rotatably connected to a limiting roller through a connecting block, the outer surface of the limiting roller is in sliding contact with the outer surface of the workpiece to be processed, and the free end of the movable rod is rotatably connected to a pressing roller.

[0029] Through the above technical scheme, in order to clamp and limit the workpiece to be processed and facilitate its processing, the workpiece to be processed is placed on the upper surface of the rotating resistance wheel, and then pressure is applied downward to the upper surface of the pressing roller, so that the movable rod is bent, and then the outer surface of the limiting resistance wheel is squeezed and contacted with the outer surface of the workpiece to be processed, thereby achieving clamping and limiting.

[0030] Preferably, the pressing mechanism also includes a driving plate movably sleeved on the outer surface of the support column, the upper surface of the driving plate is fixedly connected to the lower surface of the piston rod of the pressing cylinder, the lower surface of the driving plate is symmetrically distributed and fixedly connected with a pressing block with a circular arc surface, and the outer surface of the pressing block is in sliding contact with the outer surface of the pressing roller.

[0031] Through the above technical scheme, in order to realize the clamping processing of the limit roller, the driving plate is driven downward by the downward pressure cylinder, so that the downward pressure block is pressed on the outer surface of the pressure roller and continues to move downward until the movable rod bends so that the limit roller clamps the workpiece to be processed to achieve the limiting effect.

[0032] Preferably, the pressing mechanism also includes leveling rollers arranged on the upper and lower surfaces of the workpiece to be processed, the surface of the leveling roller is in a concave arc shape and fits the outer surface of the workpiece to be processed, the outer surface of the leveling roller is rotatably mounted with a support frame through a rotating shaft, a movable groove is opened on the surface of the support base plate, and a push cylinder extending to the lower surface of the support base plate is installed on the inner bottom wall of the movable groove, the upper surface of the piston rod of the push cylinder is fixedly connected to the lower surface of the support frame at the lower end, and the outer surface of the support frame at the lower end is slidably connected to the inner wall of the movable groove.

[0033] A push-down cylinder is installed on the lower surface of the driving plate through a mounting plate, and the lower surface of the piston rod of the push-down cylinder is fixedly connected to a side surface of the support frame at the lower end.

[0034] Through the above technical solution, in order to ensure the smoothness of the inner and outer surfaces of the pipe for subsequent processing and to improve the quality of the pipeline, after the lower pressure block is pressed down, the push cylinder and the push cylinder are respectively actuated to make their respective piston rods push the corresponding support frame, so that the upper and lower leveling rollers apply the same pressure to the outer surface of the workpiece to be processed, and with the support of the internal leveling core rod, the workpiece to be processed can be leveled.

[0035] Preferably, the material clamping and conveying mechanism also includes driven bevel gears fixedly sleeved on the outer surfaces of the lower ends of the roller shafts of the two material clamping rollers, the upper surface of the support base plate is rotatably connected to the drive shaft through a support beam, the outer surface of the drive shaft is symmetrically sleeved with active bevel gears, the active bevel gears are meshed with the driven bevel gears, the upper surface of the support base plate is fixedly connected to a rotating motor, and the outer surface of the output shaft of the rotating motor is fixedly connected to the outer surface of the drive shaft through a coupling.

[0036] Through the above technical scheme, in order to improve the leveling efficiency of the workpiece to be processed, that is, when the workpiece to be processed is rotated to be leveled, it is slowly pushed forward at a uniform speed, so that the inside and outside of the length direction of the workpiece to be processed are leveled, and in order to clamp the workpiece to be processed and transport it forward, the shape of the two clamping rollers is consistent with the leveling roller, and then after fitting the outer surface of the workpiece to be processed, the driving shaft is driven to rotate by the rotating motor, and then the rotation of the two clamping rollers is realized under the meshing of the active bevel gear and the driven bevel gear, so that not only the workpiece to be processed is pushed, but also the outer surface of the workpiece to be processed can be clamped and trimmed to keep it in a round tube shape.

[0037] Preferably, the material clamping and conveying mechanism also includes a keyway provided on the outer surface of the driving shaft, the inner surface of the toothed ring of the active bevel gear moves horizontally on the outer surface of the driving shaft through the cooperation of the key block and the keyway, an adjustment groove is provided on the upper surface of the supporting base plate, the inner wall of the adjustment groove is rotatably connected with a bidirectional adjustment screw, the bidirectional threaded outer surface of the bidirectional adjustment screw is threadedly sleeved with an adjustment plate, the upper surface of the adjustment plate is rotatably connected with the outer surface of the roller shaft of the material clamping roller and the outer surface of the active bevel gear through supporting side plates respectively, and a motor block for driving the bidirectional adjustment screw to rotate is fixedly installed on the end surface of the supporting base plate.

[0038] Through the above technical scheme, in order to accurately adjust the roundness of the workpiece to be processed, that is, to adjust the contact pressure between the clamping roller and the workpiece to be processed, the motor inside the motor block drives the bidirectional adjustment screw to rotate, so that it controls the relative movement of the two adjustment plates, and then can simultaneously drive the two clamping rollers to be relatively close and the two active bevel gears to move horizontally on the outer surface of the drive shaft. Therefore, the clamping pressure of the clamping roller on the workpiece to be processed can be adjusted in time while the clamping roller rotates, so that the clamping roller can complete the leveling of the workpiece to be processed through the support of the internal leveling core rod.

[0039] The beneficial effects of the present invention are:

[0040] 1. By setting up a supporting rotation mechanism, the workpiece to be processed can be supported and driven to rotate circumferentially at a uniform speed, thereby improving the leveling effect. During the adjustment process, after the transmission motor controls the transmission gear to rotate, the power can be transmitted to multiple rotating wheels through the engagement with the transmission thread, so that the rotation of the workpiece to be processed drives the workpiece to rotate, thereby leveling the circumferential surface of the workpiece to be processed, and the polishing stone on its surface can polish the outer surface of the workpiece to be processed to ensure that the inner and outer surfaces are smooth and flat.

[0041] 2. By setting up a clamping and conveying mechanism, the outer edges of both sides of the workpiece to be processed can be adaptively clamped, so as to trim its outer surface. During the adjustment process, the two clamping rollers are controlled to be relatively close and the two active bevel gears are synchronously moved horizontally on the outer surface of the drive shaft until the clamping rollers fit the outer surface of the workpiece to be processed with a clamping force that adjusts the roundness of the workpiece to be processed, and then the motor is rotated to drive the drive shaft to rotate, and then the two clamping rollers are rotated under the meshing of the active bevel gear and the driven bevel gear and the cooperation of the key and the keyway, so that not only the workpiece to be processed is pushed, but also the outer surface of the workpiece to be processed can be clamped and trimmed to keep it in a round tube shape.

[0042] 3. By setting up a pressing mechanism, the workpiece to be processed can be limited to facilitate processing. During the adjustment process, the driving plate is driven downward by the downward pressure cylinder, so that the downward pressure block is pressed on the outer surface of the pressing roller and continues to move downward until the movable rod is bent so that the limiting roller clamps the workpiece to be processed, thereby ensuring the circumferential rotation of the workpiece to be processed. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A three-dimensional diagram of the driving plate structure of a method for preparing a flexible stainless steel refrigerant tube proposed by the present invention;

[0044] Figure 2 A three-dimensional diagram of the downward pressure cylinder structure of a method for preparing a flexible stainless steel refrigerant pipe proposed by the present invention;

[0045] Figure 3 A three-dimensional diagram of a push-down cylinder structure of a method for preparing a flexible stainless steel refrigerant pipe proposed by the present invention;

[0046] Figure 4 A three-dimensional diagram of the installation shell structure of a method for preparing a flexible stainless steel refrigerant pipe proposed by the present invention;

[0047] Figure 5 A three-dimensional diagram of the structure of the movable rod of the method for preparing the flexible stainless steel refrigerant tube proposed by the present invention;

[0048] Figure 6 A three-dimensional diagram of a flattening roller structure of a method for preparing a flexible stainless steel refrigerant pipe proposed by the present invention;

[0049] Figure 7 A three-dimensional diagram of the clamping roller structure of the method for preparing a flexible stainless steel refrigerant tube proposed by the present invention.

[0050] In the figure: 1, CNC machine tool; 2, workpiece to be processed; 3, inner mandrel; 4, supporting bottom plate; 41, supporting column; 42, mounting top plate; 5, reciprocating mechanism; 51, pulling cylinder; 52, supporting guide rail; 53, guide slide block; 54, limit plate; 6, supporting rotating mechanism; 61, rotating wheel; 62, mounting housing; 63, polishing stone; 64, first pulley housing; 65, second pulley housing; 66, transmission shaft; 67, transmission motor; 68, transmission gear; 69, transmission thread; 70, fixing rod; 71. Movable rod; 72. Limit roller; 73. Pressing roller; 8. Pressing mechanism; 81. Driving plate; 82. Pressing cylinder; 83. Pressing block; 84. Leveling roller; 85. Support frame; 86. Moving groove; 87. Pushing cylinder; 88. Pushing cylinder; 9. Clamping and conveying mechanism; 91. Clamping roller; 92. Driven bevel gear; 93. Driving shaft; 94. Active bevel gear; 95. Rotating motor; 96. Keyway; 97. Adjusting slot; 98. Bidirectional adjusting screw; 99. Adjusting plate; 991. Motor block. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0052] Reference Figure 1 A method for preparing a flexible stainless steel refrigerant pipe comprises the following steps:

[0053] S1. Unwinding of steel strip: The raw material is stainless steel strip, which is first unwound by an unwinding machine in preparation for subsequent processing.

[0054] S2. Steel strip forming: The steel strip is processed into a tube blank according to the required shape and size through a forming machine to initially form the shape of the steel pipe.

[0055] S3. Argon arc welding: The formed steel strip is subjected to argon arc welding. The two sides of the steel strip are welded together through the argon arc welding process to form a tubular structure. During argon arc welding, the welding current is controlled between 80-125A.

[0056] S4. Internal leveling: Use leveling equipment to level the inside of the pipe after welding to ensure that the inner and outer surfaces of the pipe are smooth for subsequent processing and to improve the quality of the pipeline.

[0057] S5. Shape adjustment: After internal leveling, the stainless steel pipe enters the shaping process, and the upper, lower, left and right shaping rollers are used to finely adjust the shape of the stainless steel pipe to ensure that the outer roundness and flatness of the pipe meet the requirements.

[0058] S6. Online high-frequency annealing: High-frequency annealing is to heat the stainless steel pipe with high-frequency current to keep it at a high temperature for a certain period of time to improve the mechanical properties and toughness of the pipe. This process is usually carried out with gas protection to avoid oxidation. The electromagnetic frequency used for high-frequency annealing is 65-93kHz.

[0059] S7. Heat treatment: During the high-frequency annealing process, protective gas is used to protect the surface of the steel pipe to avoid oxidation and ensure the corrosion resistance of the pipe. Then after annealing, the pipe is quickly cooled by online water cooling to fix the organizational structure of the pipe and ensure its dimensional stability and mechanical properties.

[0060] S8. Eddy current flaw detection: The traction unit stretches the pipeline through mechanical traction to make its size meet the design requirements. Eddy current flaw detection technology is used to perform non-destructive testing on the pipeline to ensure that the pipeline has no internal defects and cracks. The frequency used for eddy current flaw detection is usually between 45-80kHz.

[0061] S9, Laser marking: Mark the pipeline to identify product batch, production date, and specification information for subsequent traceability and management.

[0062] S10, Finished pipe coiling: Finally, qualified steel pipes are coiled into coils, packaged and stored as finished pipes, ready to enter the subsequent processing link.

[0063] Reference Figure 1-Figure 7 The leveling equipment in S4 includes a CNC machine tool 1, a workpiece 2 to be processed and an inner leveling core rod 3 arranged inside the workpiece 2 to be processed. A supporting base plate 4 for reciprocating movement is arranged on the upper surface of the base plate of the CNC machine tool 1. The upper surface of the supporting base plate 4 is symmetrically distributed and fixedly connected with supporting columns 41. The upper surface of the supporting columns 41 is fixedly connected with a mounting top plate 42. A reciprocating mechanism 5 is arranged on the upper surface of the base plate of the CNC machine tool 1. A supporting rotating mechanism 6 is arranged on the upper surface of the supporting base plate 4. A pressing mechanism 8 is arranged on the lower surface of the mounting top plate 42. Both ends of the workpiece 2 to be processed are provided with a clamping and conveying mechanism 9.

[0064] Among them, the reciprocating mechanism 5 includes two pulling cylinders 51 arranged opposite to each other, both of which are installed on the upper surface of the base plate of the CNC machine tool 1, and the two pulling cylinders 51 move intermittently respectively, thereby driving the supporting base plate 4 to reciprocate in the horizontal direction.

[0065] In order to control the conveying of the workpiece 2 to be processed and complete the processing, the reciprocating mechanism 5 also includes a supporting guide rail 52 which is symmetrically distributed and fixedly connected to the upper surface of the bottom plate of the CNC machine tool 1. The outer surface of the supporting guide rail 52 is slidably clamped with a guide slider 53. The upper surface of the guide slider 53 is fixedly connected to the lower surface of the supporting bottom plate 4. The upper surface of the bottom plate of the CNC machine tool 1 is symmetrically distributed and fixedly connected with a limit stop plate 54. The limit switch on the limit stop plate 54 is in sliding contact with one side surface of the supporting bottom plate 4. When the supporting bottom plate 4 is supported by the guide slider 53 and reciprocates horizontally on the outer surface of the supporting guide rail 52, the workpiece 2 to be processed can be pushed. In order to control the moving stroke of the supporting bottom plate 4, the two pulling cylinders 51 realize stroke control through the contact between the limit stop plate 54 and the supporting bottom plate 4 when they each pull the supporting bottom plate 4 to move.

[0066] The supporting rotating mechanism 6 includes a rotating wheel 61, the outer surface of the rotating wheel 61 contacts the outer surface of the lower end of the workpiece 2, and the rotating wheel 61 drives the workpiece 2 to rotate in a uniform circumferential direction when rotating.

[0067] In order to enable the workpiece 2 to rotate circumferentially when it is conveyed forward, thereby achieving uniform leveling of its inner and outer surfaces, the supporting rotation mechanism 6 includes a mounting shell 62 that is fixedly connected to the upper surface of the supporting base plate 4 through a pad and is symmetrically distributed, and a plurality of rotating wheels 61 are rotatably connected to the end surface of the mounting shell 62 through a rotating shaft. The outer surfaces of the rotating wheels 61 are fixedly connected with polishing stones 63 distributed in a circular array. When the workpiece 2 is leveled, the rotating wheels 61 at both ends rotate synchronously, thereby forcing the workpiece 2 to rotate, and the polishing stones 63 on their surfaces can polish the outer surface of the workpiece 2.

[0068] In order to drive the rotating pulley 61 on the mounting shell 62 to rotate synchronously, the supporting rotating mechanism 6 also includes a first pulley shell 64 fixedly mounted on one side surface of the mounting shell 62, and a second pulley shell 65 is fixedly connected to one side surface of the first pulley shell 64. The upper surface of the cushion block is rotatably connected to a transmission shaft 66 through a supporting ear plate. The outer surfaces of both ends of the transmission shaft 66 extend to the corresponding interior of the second pulley shell 65 respectively. A transmission motor 67 is fixedly connected to the upper surface of the supporting base plate 4, and a transmission gear is fixedly sleeved on the outer surface of the output shaft of the transmission motor 67. 68. A transmission thread 69 is fixedly sleeved on the middle outer surface of the transmission shaft 66, and the transmission gear 68 is meshed with the transmission thread 69. The pulley assembly in the first pulley housing 64 links the rotating shaft of the corresponding rotating pulley 61, and the pulley assembly in the second pulley housing 65 links the transmission shaft 66 with the pulley assembly in the first pulley housing 64. After the transmission motor 67 controls the transmission gear 68 to rotate, the power can be transmitted to the multiple rotating pulleys 61 through the meshing with the transmission thread 69, so that the rotation of the pulleys drives the workpiece 2 to rotate.

[0069] In order to clamp and limit the workpiece 2 to facilitate its processing, the supporting rotation mechanism 6 also includes fixed rods 70 that are symmetrically distributed and fixedly connected to the two side surfaces of the mounting shell 62. The surface of the fixed rod 70 is hinged with a movable rod 71 through a torsion spring shaft. The lower surface of the free end of the movable rod 71 is rotatably connected to a limiting roller 72 through a connecting block. The outer surface of the limiting roller 72 is in sliding contact with the outer surface of the workpiece 2 to be processed. The free end of the movable rod 71 is rotatably connected to a pressing roller 73. After the workpiece 2 to be processed is placed on the upper surface of the rotating resistance wheel 61, pressure is applied downward to press the upper surface of the pressing roller 73, so that the movable rod 71 bends, and then the outer surface of the limiting resistance wheel is in extrusion contact with the outer surface of the workpiece 2 to be processed, thereby achieving clamping and limiting.

[0070] By setting up a supporting rotating mechanism 6, the workpiece 2 can be supported and driven to rotate circumferentially at a uniform speed, thereby improving the leveling effect. During the adjustment process, after the transmission motor 67 controls the transmission gear 68 to rotate, the power can be transmitted to the multiple rotating wheels 61 through the engagement with the transmission thread 69, so that the rotation of the workpiece 2 drives the workpiece 2 to rotate, so that the circumferential surface of the workpiece 2 can be leveled, and the polishing stone 63 on its surface can polish the outer surface of the workpiece 2 to ensure that the inner and outer surfaces are smooth and flat.

[0071] The pressing mechanism 8 includes a pressing cylinder 82 which is fixedly mounted on the upper surface of the mounting top plate 42. When the piston rod of the pressing cylinder 82 is pushed downward, pressure can be applied to the outer surface of the workpiece to be processed, thereby flattening its shape.

[0072] In order to realize the clamping processing of the limiting roller 72, the pressing mechanism 8 also includes a driving plate 81 movably sleeved on the outer surface of the support column 41, the upper surface of the driving plate 81 is fixedly connected to the lower surface of the piston rod of the pressing cylinder 82, and the lower surface of the driving plate 81 is symmetrically distributed and fixedly connected with a pressing block 83 with a circular arc surface, the outer surface of the pressing block 83 is in sliding contact with the outer surface of the pressing roller 73, and the driving plate 81 is driven by the pressing cylinder 82 to move downward, so that the pressing block 83 is pressed on the outer surface of the pressing roller 73 and continues to move downward until the movable rod 71 bends so that the limiting roller 72 clamps the workpiece 2 to be processed to achieve the limiting effect.

[0073] In order to ensure that the inner and outer surfaces of the pipe are smooth for subsequent processing and to improve the quality of the pipe, the pressing mechanism 8 also includes a leveling roller 84 arranged on the upper and lower surfaces of the workpiece 2 to be processed. The surface of the leveling roller 84 is in a concave arc shape and fits the outer surface of the workpiece 2 to be processed. A support frame 85 is installed on the outer surface of the leveling roller 84 through a rotating shaft. A movable groove 86 is opened on the surface of the supporting bottom plate 4. A push cylinder 87 extending to the lower surface of the supporting bottom plate 4 is installed on the inner bottom wall of the movable groove 86. The upper surface of the piston rod of the push cylinder 87 is fixed to the lower surface of the lower end support frame 85. The outer surface of the lower support frame 85 is slidably connected to the inner wall of the movable groove 86, and the lower surface of the driving plate 81 is installed with a push-down cylinder 88 through a mounting plate. The lower surface of the piston rod of the push-down cylinder 88 is fixedly connected to one side surface of the lower support frame 85. After the lower pressure block 83 is pressed down, the top push cylinder 87 and the push-down cylinder 88 are respectively actuated to make their respective piston rods push the corresponding support frame 85, so that the upper and lower leveling rollers 84 apply the same pressure to the outer surface of the workpiece 2 to be processed, and with the support of the inner leveling core rod 3, the workpiece 2 to be processed can be leveled.

[0074] By setting up the pressing mechanism 8, the workpiece 2 can be limited to facilitate processing. During the adjustment process, the driving plate 81 is driven downward by the pressing cylinder 82, so that the pressing block 83 is pressed on the outer surface of the pressing roller 73 and continues to move downward until the movable rod 71 bends so that the limiting roller 72 clamps the workpiece 2 to ensure the circumferential rotation of the workpiece 2.

[0075] The clamping and conveying mechanism 9 includes clamping rollers 91 , which adaptively clamp the outer edges of the workpiece 2 on both sides, thereby trimming the outer surfaces.

[0076] In order to improve the leveling efficiency of the workpiece 2 to be processed, that is, when the workpiece 2 to be processed is rotated and leveled, it is slowly pushed forward at a uniform speed, so that the workpiece 2 to be processed is leveled inside and outside in the length direction. In order to clamp the workpiece 2 to be processed and transport it forward, the clamping and conveying mechanism 9 also includes a driven bevel gear 92 fixedly sleeved on the outer surface of the lower end of the roller shaft of the two clamping rollers 91, and the upper surface of the supporting bottom plate 4 is rotatably connected to a driving shaft 93 through a supporting beam frame. The outer surface of the driving shaft 93 is symmetrically sleeved with active bevel gears 94, and the active bevel gear 94 meshes with the driven bevel gear 92. A rotating motor 95 is fixedly connected to the upper surface of the supporting base plate 4, and the outer surface of the output shaft of the rotating motor 95 is fixedly connected to the outer surface of the driving shaft 93 through a coupling. The appearance of the two clamping rollers 91 is consistent with the leveling roller 84, and then after fitting the outer surface of the workpiece 2 to be processed, the driving shaft 93 is driven to rotate by the rotating motor 95, and then the two clamping rollers 91 are rotated under the meshing of the active bevel gear 94 and the driven bevel gear 92, so that not only the workpiece 2 to be processed can be pushed, but also the outer surface of the workpiece 2 to be processed can be clamped and trimmed to keep it in a round tube shape.

[0077] In order to precisely adjust the roundness of the workpiece 2 to be processed, that is, to adjust the contact pressure between the clamping roller 91 and the workpiece 2 to be processed, the clamping conveying mechanism 9 also includes a keyway 96 provided on the outer surface of the driving shaft 93. The inner surface of the toothed ring of the active bevel gear 94 moves horizontally on the outer surface of the driving shaft 93 through the cooperation between the key block and the keyway 96. An adjusting groove 97 is provided on the upper surface of the supporting bottom plate 4. A bidirectional adjusting screw 98 is rotatably connected to the inner wall of the adjusting groove 97. An adjusting plate 99 is threadedly sleeved on the bidirectional threaded outer surface of the bidirectional adjusting screw 98. The upper surface of the adjusting plate 99 is respectively connected to the support side plate and the clamping roller 91 through the support side plate and the clamping roller 91. The outer surface of the roller shaft and the outer surface of the active bevel gear 94 are rotatably connected, and the end surface of the supporting base plate 4 is fixedly installed with a motor block 991 that drives the two-way adjustment screw 98 to rotate. The motor inside the motor block 991 drives the two-way adjustment screw 98 to rotate, so that it controls the relative movement of the two adjustment plates 99, and then can simultaneously drive the two clamping rollers 91 to approach relatively and the two active bevel gears 94 to move horizontally on the outer surface of the driving shaft 93. Therefore, the clamping pressure of the clamping roller 91 on the workpiece 2 to be processed can be adjusted in time while the clamping roller 91 rotates, so that the clamping roller 91 completes the leveling of the workpiece 2 to be processed through the support of the internal leveling core rod 3.

[0078] By setting up a clamping and conveying mechanism 9, the outer edges of both sides of the workpiece 2 can be adaptively clamped, so that its outer surface can be trimmed. During the adjustment process, the two clamping rollers 91 are controlled to be relatively close and the two active bevel gears 94 are synchronously moved horizontally on the outer surface of the drive shaft 93 until the clamping rollers 91 fit the outer surface of the workpiece 2 with a clamping force that adjusts the roundness of the workpiece 2. Then the motor 95 is rotated to drive the drive shaft 93 to rotate, and then the two clamping rollers 91 are rotated under the meshing of the active bevel gear 94 and the driven bevel gear 92 and the cooperation of the key and the keyway 96. Therefore, not only the workpiece 2 can be pushed, but also the outer surface of the workpiece 2 can be clamped and trimmed to keep it in a round tube shape.

[0079] Working principle: In a specific embodiment of the present invention, the formed steel strip is subjected to argon arc welding, and the two sides of the steel strip are welded together by the argon arc welding process to form a tubular workpiece 2 to be processed, and an inner mandrel 3 is inserted according to the inner diameter size of the workpiece 2 to be processed. The inner mandrel 3 runs through the entire device through the connection of steel ropes, and the workpiece 2 to be processed moves horizontally on the outer surface of the inner mandrel 3;

[0080] After the workpiece 2 with the inner integral core rod 3 is placed on the upper surface of the rotating wheel 61, the driving plate 81 is driven downward by the downward pressure cylinder 82, so that the downward pressure block 83 is pressed on the outer surface of the pressing roller 73 and continues to move downward until the movable rod 71 is bent so that the limiting roller 72 clamps the workpiece 2;

[0081] At this time, the inner and outer surfaces of the workpiece 2 are leveled, and the push cylinder 87 and the push cylinder 88 are respectively actuated, so that their respective piston rods push the corresponding support frame 85, so that the upper and lower leveling rollers 84 apply the same pressure to the outer surface of the workpiece 2, and with the support of the inner leveling mandrel 3, the workpiece 2 can be leveled;

[0082] When the leveling roller 84 applies pressure, the transmission motor 67 controls the transmission gear 68 to rotate, and the transmission gear 68 can be meshed with the transmission thread 69 to transmit power to the multiple rotating wheels 61, so that the rotation of the wheels drives the workpiece 2 to rotate, so that the circumferential surface of the workpiece 2 can be leveled, and the polishing stone 63 on the surface can polish the outer surface of the workpiece 2;

[0083] In order to increase the coverage area of ​​one-time leveling, the motor inside the motor block 991 drives the bidirectional adjustment screw 98 to rotate, so that it controls the relative movement of the two adjustment plates 99, and then can simultaneously drive the two clamping rollers 91 to be relatively close and the two active bevel gears 94 to move horizontally on the outer surface of the driving shaft 93, until the clamping rollers 91 fit the outer surface of the workpiece 2 to adjust the roundness of the workpiece 2, and then the motor 95 is rotated to drive the driving shaft 93 to rotate, and then the two clamping rollers 91 are rotated under the meshing of the active bevel gear 94 and the driven bevel gear 92 and the cooperation of the key and the keyway 96, so that not only the workpiece 2 to be processed is pushed, but also the outer surface of the workpiece 2 to be processed can be clamped and trimmed to keep it in a round tube shape;

[0084] When it is necessary to push the workpiece 2 to move to the next process, the two pressure rollers 73 and the clamping roller 91 clamp the workpiece 2, and one of the pulling cylinders 51 pulls the supporting base plate 4 to move horizontally on the outer surface of the supporting guide rail 52, so that the workpiece 2 can be pushed. At this time, the clamping roller 91 and the pressure roller 73 are reset, and the other pulling cylinder 51 pushes the supporting base plate 4 to reset, so that the next section of the workpiece 2 can be leveled.

[0085] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a flexible stainless steel refrigerant pipe, comprising a flattening device, characterized in that: The leveling device comprises a numerically controlled machine tool (1), a workpiece to be processed (2), and an internal leveling core rod (3) arranged inside the workpiece to be processed (2); a support base plate (4) for reciprocating movement is arranged on the upper surface of the base plate of the numerically controlled machine tool (1); support columns (41) are symmetrically distributed and fixedly connected to the upper surface of the support base plate (4); a mounting top plate (42) is fixedly connected to the upper surface of the support column (41); a reciprocating mechanism (5) is arranged on the upper surface of the base plate of the numerically controlled machine tool (1); a supporting rotating mechanism (6) is arranged on the upper surface of the support base plate (4); a material pressing mechanism (8) is arranged on the lower surface of the mounting top plate (42); and material clamping and conveying mechanisms (9) are arranged at both ends of the workpiece to be processed (2); The reciprocating mechanism (5) comprises two pulling cylinders (51) arranged opposite to each other, the two pulling cylinders (51) are both mounted on the upper surface of the bottom plate of the CNC machine tool (1), and the two pulling cylinders (51) move intermittently and independently, thereby driving the supporting bottom plate (4) to perform reciprocating motion in the horizontal direction; The supporting rotation mechanism (6) comprises a rotating wheel (61), the outer surface of the rotating wheel (61) contacts the outer surface of the lower end of the workpiece (2) to be processed, and when the rotating wheel (61) rotates, it drives the workpiece (2) to be processed to rotate in a uniform circumferential direction; The support rotation mechanism (6) comprises a mounting shell (62) fixedly connected to the upper surface of the support base plate (4) via pads and in a symmetrical distribution; The supporting rotation mechanism (6) further comprises fixed rods (70) symmetrically distributed and fixedly connected to the surfaces of both sides of the mounting shell (62); a movable rod (71) is hingedly connected to the surface of the fixed rod (70) via a torsion spring shaft; the lower surface of the free end of the movable rod (71) is rotatably connected to a limiting roller (72) via a connecting block; the outer surface of the limiting roller (72) is in sliding contact with the outer surface of the workpiece (2) to be processed; and the free end of the movable rod (71) is rotatably connected to a pressing roller (73); The material pressing mechanism (8) comprises a downward pressing cylinder (82), wherein the downward pressing cylinder (82) is fixedly mounted on the upper surface of the mounting top plate (42), and when the piston rod of the downward pressing cylinder (82) is pushed downward, pressure can be applied to the outer surface of the workpiece (2) to be processed, thereby flattening its shape; Wherein, the clamping and conveying mechanism (9) comprises clamping rollers (91), and the clamping rollers (91) adaptively clamp the outer edges of both sides of the workpiece (2) to be processed, thereby trimming its outer surface; The clamping and conveying mechanism (9) further comprises driven bevel gears (92) respectively fixedly sleeved on the outer surfaces of the lower ends of the roller shafts of the two clamping rollers (91); the upper surface of the support base plate (4) is rotatably connected to a drive shaft (93) via a support beam; the outer surface of the drive shaft (93) is symmetrically sleeved with driving bevel gears (94); the driving bevel gears (94) are meshed with the driven bevel gears (92); the upper surface of the support base plate (4) is fixedly connected to a rotating motor (95); the outer surface of the output shaft of the rotating motor (95) is fixedly connected to the outer surface of the drive shaft (93) via a coupling; The clamping and conveying mechanism (9) further comprises a keyway (96) provided on the outer surface of the driving shaft (93); the inner surface of the toothed ring of the active bevel gear (94) moves horizontally on the outer surface of the driving shaft (93) through the cooperation between the key block and the keyway (96); an adjusting groove (97) is provided on the upper surface of the supporting base plate (4); a bidirectional adjusting screw (98) is rotatably connected to the inner wall of the adjusting groove (97); an adjusting plate (99) is threadedly sleeved on the bidirectional threaded outer surface of the bidirectional adjusting screw (98); the upper surface of the adjusting plate (99) is rotatably connected to the outer surface of the roller shaft of the clamping roller (91) and the outer surface of the active bevel gear (94) through supporting side plates; a motor block (991) for driving the bidirectional adjusting screw (98) to rotate is fixedly mounted on the end surface of the supporting base plate (4).

2. The method for preparing a flexible stainless steel refrigerant pipe according to claim 1, characterized in that: The method for preparing a flexible stainless steel refrigerant pipe using the flattening device comprises the following steps: S1. Unwinding of steel strip: The raw material is stainless steel strip, which is first unwound by the unwinding machine to prepare for subsequent processing; S2. Steel strip forming: The steel strip is processed into a tube blank according to the required shape and size through a forming machine to initially form the shape of the steel pipe; S3, argon arc welding: the formed steel strip is subjected to argon arc welding, and the two sides of the steel strip are welded together through the argon arc welding process to form a tubular structure. During argon arc welding, the welding current is controlled between 80-125A; S4, internal leveling: Use the leveling equipment to level the inside of the pipe after welding to ensure that the inner and outer surfaces of the pipe are smooth for subsequent processing and to improve the quality of the pipe; S5. Shape adjustment: After internal leveling, the stainless steel pipe enters the shaping process, and the shape of the stainless steel pipe is finely adjusted using the upper, lower, left, and right shaping rollers to ensure that the outer roundness and flatness of the pipe meet the requirements; S6. Online high-frequency annealing: High-frequency annealing is to heat the stainless steel pipe with high-frequency current to keep it at a high temperature for a certain period of time to improve the mechanical properties and toughness of the pipe. This process is usually carried out with gas protection to avoid oxidation. The electromagnetic frequency used for high-frequency annealing is 65-93kHz; S7. Heat treatment: During the high-frequency annealing process, protective gas is used to protect the surface of the steel pipe to avoid oxidation and ensure the corrosion resistance of the pipe. Then after annealing, the pipe is quickly cooled by online water cooling to fix the organizational structure of the pipe and ensure its dimensional stability and mechanical properties. S8. Eddy current flaw detection: The traction unit stretches the pipeline through mechanical traction to make its size meet the design requirements. Eddy current flaw detection technology is used to perform non-destructive testing on the pipeline to ensure that the pipeline has no internal defects and cracks. The frequency used for eddy current flaw detection is usually between 45-80kHz.

3. The method for preparing a flexible stainless steel refrigerant pipe according to claim 1, characterized in that: The reciprocating mechanism (5) further comprises support guide rails (52) symmetrically distributed and fixedly connected to the upper surface of the bottom plate of the CNC machine tool (1); a guide slider (53) is slidably engaged on the outer surface of the support guide rails (52); the upper surface of the guide slider (53) is fixedly connected to the lower surface of the support bottom plate (4); a limit stop plate (54) is symmetrically distributed and fixedly connected to the upper surface of the bottom plate of the CNC machine tool (1); a limit switch on the limit stop plate (54) is in sliding contact with a side surface of the support bottom plate (4).

4. The method for preparing a flexible stainless steel refrigerant pipe according to claim 1, characterized in that: The plurality of rotating wheels (61) are rotatably connected to the end surface of the mounting shell (62) via a rotating shaft, and polishing stones (63) are fixedly connected to the outer surfaces of the rotating wheels (61) in a circular array.

5. The method for preparing a flexible stainless steel refrigerant pipe according to claim 4, characterized in that: The support rotation mechanism (6) further comprises a first pulley housing (64) fixedly mounted on a side surface of the mounting housing (62); a second pulley housing (65) is fixedly connected to a side surface of the first pulley housing (64); an upper surface of the cushion block is rotatably connected to a transmission shaft (66) via a support ear plate; outer surfaces at both ends of the transmission shaft (66) respectively extend to the inside of the corresponding second pulley housing (65); an upper surface of the support base plate (4) is fixedly connected to a transmission motor (67); an outer surface of an output shaft of the transmission motor (67) is fixedly sleeved with a transmission gear (68); a middle outer surface of the transmission shaft (66) is fixedly sleeved with a transmission thread (69); the transmission gear (68) meshes with the transmission thread (69).

6. The method for preparing a flexible stainless steel refrigerant pipe according to claim 5, characterized in that: The material pressing mechanism (8) further comprises a driving plate (81) movably sleeved on the outer surface of the support column (41); the upper surface of the driving plate (81) is fixedly connected to the lower surface of the piston rod of the downward pressing cylinder (82); the lower surface of the driving plate (81) is symmetrically distributed and fixedly connected with a downward pressing block (83) having a circular arc surface; the outer surface of the downward pressing block (83) is in sliding contact with the outer surface of the material pressing roller (73).

7. The method for preparing a flexible stainless steel refrigerant pipe according to claim 6, characterized in that: The pressing mechanism (8) further comprises a leveling roller (84) arranged on the upper and lower surfaces of the workpiece (2) to be processed, the surface of the leveling roller (84) being in a concave arc shape and being fitted to the outer surface of the workpiece (2) to be processed, a support frame (85) being rotatably mounted on the outer surface of the leveling roller (84) via a rotating shaft, a movable groove (86) being provided on the surface of the support base plate (4), a push cylinder (87) extending to the lower surface of the support base plate (4) being mounted on the inner bottom wall of the movable groove (86), the upper surface of the piston rod of the push cylinder (87) being fixedly connected to the lower surface of the support frame (85) at the lower end, and the outer surface of the support frame (85) at the lower end being slidably connected to the inner wall of the movable groove (86); A push-down cylinder (88) is mounted on the lower surface of the driving plate (81) via a mounting plate, and the lower surface of the piston rod of the push-down cylinder (88) is fixedly connected to a side surface of the support frame (85) at the lower end.

Images