Machining method of refrigeration pipeline piece comprising steel main pipe-copper branch pipe structure

Abstract

The invention discloses a processing method of a refrigeration pipeline piece comprising a steel main pipe-copper branch pipe structure, which comprises the following steps of: performing flaring treatment on the end part of a stainless steel main pipe to obtain a copper head mounting structure, assembling a copper head in the copper head mounting structure, and welding in a tunnel furnace through welding flux; high-frequency local heating is carried out on the copper head installation structure area to complete welding operation of the copper head and the copper branch pipe, and then the problem that the copper connecting pipe becomes soft and cannot meet airtightness detection due to the fact that the copper connecting pipe is directly welded in the tunnel furnace can be solved. The stainless steel pipe fitting is pre-punched with the elliptical hole which is flush with the terminal end face and meets the requirement for designing the size of the flanging structure, it can be ensured that the end of the flanging structure is flush when the outer flanging is formed, then it can be ensured that welding flux of a welding bead is homogenized in a tunnel furnace, and the quality of the pipe fitting is ensured.

Description

Technical Field

[0001] The invention relates to a refrigeration system pipeline manufacturing technology, in particular to a processing method of a refrigeration pipeline component including a steel main pipe-copper branch pipe structure. Background Art

[0002] Refrigeration system pipe fittings are generally welded from a main pipe with a larger diameter and a branch pipe with a smaller diameter. Traditional refrigeration system pipe fittings are made of copper pipes. The high price of copper makes the pipe fittings costly. Pipe fittings made of stainless steel main pipes and copper branch pipes have appeared on the market. By replacing copper with stainless steel, the cost is saved compared to all-copper pipe fittings. However, there are some problems in the production of this type of pipe fittings:

[0003] 1. For this type of pipe fittings, tunnel furnaces are mostly used to complete the welding of stainless steel main pipes, copper branches and copper pipes. After the pipe fittings are manufactured, they need to be tested for air tightness on the ends of the copper pipes on the main pipes when entering the main engine factory. The air tightness test requires sealing the ends of the copper pipes with a certain pressure. Due to the high temperature treatment in the tunnel furnace, the copper pipes will become soft and cannot meet the requirements of the air tightness test.

[0004] 2. When processing this type of pipe fittings, the pre-punched round hole needs to be pulled outward to form a flanging. If the pre-punched round hole area is directly pulled, the port will be uneven and a crescent shape will appear on the end face. The appearance of this crescent shape cannot guarantee the uniformity of the weld in subsequent welding operations, and it is easy for material shortages to occur at both ends in the middle of the crescent shape, which will lead to quality problems of the pipe fittings.

[0005] 3. After the flanging structure of this type of pipe fittings is formed, the existing technology lacks the inner circle shaping operation of the flanging structure, which will lead to the problem of the inner circle of the flanging being not round and the axial size being different when the flanging is formed by external drawing. When assembling the copper branch pipe, it will be partially too loose, resulting in the inability of the welding liquid to effectively fill the weld, and then there will be quality problems of the pipe fittings.

[0006] 4. For this type of pipe fittings, since the material of the copper branch pipe is softer than that of the stainless steel pipe fittings, if the coaxial installation is not maintained during the assembly process, it is easy to cause uneven circumferential weld thickness, and the axis of the copper branch pipe and the flange structure will not be coaxial, resulting in quality problems of the pipe fittings. Summary of the invention

[0007] In order to solve the above technical problems, the inventors have obtained the technical solution of the present invention through practice and summary. The present invention adopts the following technical solution:

[0008] A processing method for a refrigeration pipeline component including a steel main pipe-copper branch pipe structure, the manufacturing steps are as follows:

[0009] Step 1: Production of stainless steel main pipe:

[0010] Select stainless steel pipe fittings that meet the design requirements for cutting, deburr both ends after cutting, and pre-punch elliptical holes on the pipe fittings;

[0011] The pre-punched elliptical hole is flanging-processed to obtain a flanging structure with the flanging port flush with the height of the flanging port on the pipe fitting;

[0012] The inner diameter of the flange structure is calibrated and the inner circle of the flange structure is shaped;

[0013] One end of the pipe fitting is expanded to obtain a copper head installation structure;

[0014] Step 2: Making copper branch pipes:

[0015] Select copper pipe fittings that meet the design requirements for cutting, shrink one end of the copper pipe fittings, bend the copper pipe fittings that need to be bent, and finally cut the other end of the copper pipe fittings;

[0016] Step 3: Pipeline fittings production:

[0017] A welding ring is mounted on the outer side of the copper branch pipe threaded end, the copper branch pipe threaded end is axially inserted into the inner circle of the flange structure and the welding ring is ensured to fit on the end surface of the flange structure, wherein the copper branch pipe threaded end and the flange structure are in a tight fit state;

[0018] Install the copper head and the required welding ring in the copper head mounting structure;

[0019] Place the assembled stainless steel main pipe and copper branch pipe vertically on the chain belt of the tunnel furnace and complete the assembly in the tunnel furnace;

[0020] After cooling to room temperature, the copper pipe is welded to the copper head installation structure area by high-frequency local heating to obtain a stainless steel pipe fitting.

[0021] Preferably, in step 3, the copper branch pipe is axially inserted into the inner circle of the flange structure on the assembly platform;

[0022] The assembly platform is provided with a lower positioning body, a vertical plate is installed on the rear side of the assembly platform, an upper positioning body is installed on the vertical plate, the upper positioning body is adjustable in vertical position relative to the lower positioning body, and the upper positioning body is downwardly moved to cooperate with the lower positioning body to fix the stainless steel main pipe;

[0023] The assembly platform is also equipped with a special-shaped branch pipe moving seat and a straight branch pipe moving seat, which are slidably matched relative to the assembly platform, and the special-shaped branch pipe moving seat is provided with a special-shaped pipe positioning structure, and the straight branch pipe moving seat is provided with a straight branch pipe positioning structure;

[0024] A fixed seat is installed on the special-shaped branch pipe moving seat, the fixed seat is arranged vertically, and the fixed seat is located on the side of the special-shaped branch pipe moving seat away from the upper positioning body. A slide groove of a vertical stainless steel main pipe is arranged on the special-shaped branch pipe moving seat, and a slide plate is slidably matched in the slide groove. A spring is installed between the slide plate and the fixed seat, and the slide plate is used to limit the top position of the special-shaped branch pipe;

[0025] A vertical guide groove is provided on the vertical plate, and the upper positioning body is slidably fitted in the vertical guide groove. A quick pressing clamp 1 is installed on the vertical plate, and the quick pressing clamp 1 is used to drive the upper positioning body to adjust the vertical position relative to the lower positioning body;

[0026] A guide table and a second quick press clamp for a vertical stainless steel main pipe are installed on the assembly platform. The special-shaped branch pipe moving seat and the straight branch pipe moving seat are slidably matched on the guide table. The second quick press clamp drives the special-shaped branch pipe moving seat and the straight branch pipe moving seat to move closer to or away from the stainless steel main pipe.

[0027] Preferably, the lower positioning body is provided with a main pipe lower positioning structure, and the upper positioning body is provided with a main pipe lower positioning structure;

[0028] The main pipe lower positioning structure and the main pipe upper positioning structure both include a main pipe positioning groove and an outer flange positioning groove, and the outer flange positioning groove of the main pipe upper positioning structure is a U-shaped structure.

[0029] Preferably, a welding ring correction component is provided on the assembly platform, and the welding ring correction component is located on the side of the special-shaped branch pipe moving seat and the straight branch pipe moving seat close to the stainless steel main pipe. The welding ring correction component is used to correct the welding ring and is sleeved on the outside of the branch pipe.

[0030] Preferably, the welding ring correction assembly comprises a movable piece 1 and a movable piece 2, wherein the movable piece 2 is located on a side of the movable piece 1 away from the stainless steel main pipe, and a welding ring containing notch is provided on a side of the movable piece 2 opposite to the movable piece 1, and the top of the welding ring containing notch is open, and the movable piece 1 and the movable piece 2 are both symmetrically provided with two groups;

[0031] A sliding pin 1 is arranged at the bottom of the movable piece 1, a sliding groove 1 arranged parallel to the stainless steel main pipe is arranged on the assembly platform, the sliding pin 1 is slidably installed inside the sliding groove 1, the sliding groove 1 includes a notch 1 arranged perpendicular to the stainless steel main pipe and a notch 2 arranged parallel to the stainless steel main pipe, one end of the notch 2 intersects with one end of the notch 1, and the sliding pin 1 is connected to the assembly platform through a spring;

[0032] A second slide pin is provided at the bottom of the second movable piece, and a second slide groove is provided on the assembly platform and is vertically provided with a stainless steel main pipe, and the second slide pin is slidably installed inside the second slide groove;

[0033] An elastic block is arranged on one side of the moving seat close to the stainless steel main pipe, and the elastic block is elastically deformed before the spring on the sliding pin 1 is elastically deformed, so that the welding ring is sleeved on the outer wall of the branch pipe;

[0034] When the movable seat approaches the stainless steel main pipe, the movable sheet 2 acts to squeeze the welding ring inside the welding ring receiving groove onto the movable sheet 1 to complete a full circle.

[0035] Preferably, when the copper pipe end of the elbow needs to be threaded, the upper positioning block and the lower positioning block are used to compress and fix the copper pipe, and the vertical position height of the upper positioning block relative to the lower positioning block is adjustable;

[0036] The upper positioning block and the lower positioning block are both provided with special-shaped positioning structures on the opposite side, and the upper positioning block and the lower positioning block are used to position the special-shaped pipe fittings through the special-shaped positioning structures;

[0037] The axial position of the exposed end of the copper pipe fitting is adjusted by pressing and fixing the exposed end of the copper pipe fitting with the upper positioning block and the lower positioning block through the thread cutting die, and the exposed end is shaped and thread cut;

[0038] The cutting die comprises a cutting ring with an adjustable axial position relative to the orifice of the special-shaped pipe fitting, cutting bodies are evenly arranged in the cutting ring, a trumpet is arranged near the port of the special-shaped pipe fitting on the cutting ring for shaping the orifice of the special-shaped pipe fitting, and the cutting body is used to evenly cut the surface of the orifice after shaping.

[0039] Preferably, the cutout body is an isosceles triangle structure, the angles between the two sides of the cutout body are 15-25°, and the thickness of the cutout body is 0.1-0.15 mm;

[0040] The areas near the cutting ring on both sides of the cutting body are both concave arc structures, the radius of the arc structure is 0.02-0.05mm, and the cutting body is obtained by wire cutting;

[0041] The thickness of the cutting body near the port of the special-shaped pipe fitting is less than the thickness of the position far from the port of the special-shaped pipe fitting. By strictly limiting the thickness of the cutting body, it is easy to obtain a cutting depth on the outer wall of the pipe opening away from the pipe opening, which gradually decreases to zero, so that the welding liquid flows to the side close to the stainless steel pipe fitting;

[0042] An end of the engraving ring away from the port of the special-shaped pipe fitting is provided with an inward-retracting structure, and the inward-retracting structure is used to form a certain slope or taper at the port of the special-shaped pipe fitting;

[0043] The inward-retracting structure is an annular structure arranged in the wire cutting ring at the end away from the special-shaped pipe port. The width of the inward-retracting structure is 2-4mm. The size of the end of the inward-retracting structure close to the special-shaped pipe port is larger than the size of the end away from the special-shaped pipe port, and the angle between the inner circle of the inward-retracting structure and the inner wall of the wire cutting ring is 2-5°.

[0044] Preferably, in step 1, when flanging the pre-punched elliptical hole, the stainless steel pipe fitting is installed in the limiting structure on the moving block, the moving block is slidably fitted on the fixed block, a notch groove is provided on the fixed block, and an inwardly concave positioning structure is provided on the fixed block, and the stainless steel pipe fitting is radially positioned by the limiting structure and the positioning structure;

[0045] By inserting the inner bell-and-spigot pipe into the stainless steel pipe fitting, a driving wedge rod is slidably matched inside the inner bell-and-spigot pipe, a radial through hole is arranged on the side wall of the inner bell-and-spigot pipe, a pulling head is slidably matched inside the radial through hole, an oblique guide groove is arranged on the side wall of the end of the driving wedge rod, a guide block is arranged at the bottom of the pulling head, the guide block and the oblique guide groove are slidably matched, and the movement of the driving wedge rod in the inner bell-and-spigot pipe drives the pulling head to extend or retract inside or outside the radial through hole, and the elliptical hole is pulled outward and flanging;

[0046] A guide rod is installed on the fixed block, a spring and an ear plate are sleeved on the guide rod, the ear plate is located on the top of the spring, a sleeve is fixed on the ear plate, a hole calibration piece is rotatably installed in the sleeve, the hole calibration piece is located just above the radial through hole, the hole calibration piece is located on the top of the notch groove, the vertical position of the hole calibration piece relative to the notch groove is adjustable, and a forming part and a socket part and a gradient part arranged between the forming part and the socket part are installed on the hole calibration piece;

[0047] The end of the pull head is provided with a matching blind hole, and the matching blind hole and the socket part are adapted;

[0048] A hooking groove is provided at the root of the matching blind hole and a magnetic block is provided in the groove, an eccentric block is provided on the outer side of the socket part, and the magnetic block is used to absorb the eccentric block so that the eccentric block is offset in the matching blind hole to form a hooking structure;

[0049] A rotating crown is arranged on the top of the hole adjustment piece, and the magnetic attraction block and the eccentric block are separated by operating the rotating crown.

[0050] Preferably, the moving block is provided with an arc groove, a rotating plate is slidably fitted in the arc groove, an avoidance groove is provided on the top of the rotating plate, the avoidance groove and the notch groove are surrounded to form a flange outer molding area, and a horizontal rod is installed on the top side of the rotating plate;

[0051] A horizontal groove for positioning the horizontal rod is arranged on one side of the top of the fixed block facing the movable block, and the horizontal rod is selectively adapted in the horizontal groove.

[0052] Preferably, a hook plate is rotatably installed on the side of the fixed block, the hook plate is used to hook the horizontal rod and be confined in the horizontal groove, an arc guide groove is provided on the rear side of the hook plate, a pin shaft is installed in the arc guide groove, and the pin shaft is installed on the side of the fixed block.

[0053] Compared with the prior art, the present invention has the following beneficial effects:

[0054] In response to problem 1, the present invention expands the end of the stainless steel main pipe to obtain a copper head installation structure, assembles the copper head inside the structure, and completes welding with solder in a tunnel furnace. High-frequency local heating is performed on the copper head installation structure area to complete the welding of the copper head and the copper branch pipe, thereby avoiding the problem of the copper pipe becoming soft and unable to meet the air tightness test due to direct welding of the copper pipe in the tunnel furnace.

[0055] In response to question 2, the present invention pre-punches an elliptical hole on the stainless steel pipe fitting that meets the final end face height and the design flange structure size requirements. This can ensure that the ends of the flange structure are flush during the outer flange forming, thereby ensuring that the solder of the weld is homogenized in the tunnel furnace, thereby ensuring the quality of the pipe fitting.

[0056] In response to question 3, the present invention performs hole calibration inside the outer flange structure formed by drawing, and uses the hole calibration to make the inner part of the flange structure round, which is conducive to the melting of the welding ring in the tunnel furnace after the copper branch pipe is installed and evenly distributed in the weld bead, ensuring the quality of pipe fittings. The present invention uses a method of pulling the head outward and flanging inward to calibrate the hole, and efficiently completes the flanging forming operation of the hole.

[0057] In response to question 4, the present invention proposes a special assembly tool, which uses an upper positioning body to perform correction and centering when positioning the outer flange on the stainless steel pipe fitting, and cooperates with the lower positioning body to accurately position and tighten the stainless steel main pipe. The welding ring can be corrected to form a circular ring through the welding ring correction assembly. The welding ring is an open-ring structure, which is installed during the axial socketing process of the copper branch pipe, and can be attached to the end face of the flange structure after the socketing. The capillary drainage of the engraved wire on the copper branch pipe can ensure the uniformity of the welding liquid and ensure the quality of pipe fitting manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 This is a structural diagram of the stainless steel pipeline assembly of the present invention.

[0059] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0060] Figure 3 It is a structural diagram of the assembly platform of the present invention.

[0061] Figure 4 for Figure 3 Position structure diagram of the middle slide plate on the movable seat of the special-shaped branch pipe.

[0062] Figure 5 for Figure 3 Top view of the structure on the assembly platform.

[0063] Figure 6 for Figure 5 A partial enlarged view of point B in the middle.

[0064] Figure 7 for Figure 3 Top view of the center guide and weld ring correction assembly.

[0065] Figure 8 for Figure 7 A partial enlarged view of point C in the middle.

[0066] Fig. 9 for Figure 3 Bottom structure diagram of the middle and upper positioning body.

[0067] Fig.10 The figure is a positional relationship diagram of the wire cutting mold and the upper positioning block and the lower positioning block in the present invention.

[0068] Fig.11 for Fig.10 Diagram of the internal structure of the medium wire cutting mold.

[0069] Fig.12 for Fig.11 Side view of the medium wire cutting die.

[0070] Fig.13 for Fig.12 A partial enlarged view of point D in the middle.

[0071] Fig.14 for Fig.10 A magnified view of the part of the middle engraved body near the bell mouth.

[0072] Fig.15 It is the position distribution diagram of the movable block, inner bell pipe, hole adjustment piece and fixed block.

[0073] Fig.16 for Fig.15 A partial enlarged view of point E in the middle.

[0074] Fig.17 for Fig.16 Side view of the fixed block and movable block.

[0075] Fig.18 for Fig.15 Position distribution diagram of the inner bell pipe, driving wedge rod and pulling head.

[0076] Fig.19 for Fig.15 Schematic diagram of the structure after the center hole fitting and the pulling head are matched.

[0077] Fig. 20 for Fig.15 Top view of the pull head.

[0078] In the figure:

[0079] 101. Stainless steel main pipe; 1011. Flanging structure; 102. Copper branch pipe; 103. Copper head installation structure; 104. Copper connecting pipe;

[0080] 200, assembly platform; 2001, guide platform; 2002, quick press clamp 2; 2003, main pipe positioning groove; 2004, outer flange positioning groove; 201, lower positioning body; 202, vertical plate; 2021, quick press clamp 1; 203, upper positioning body; 204, special-shaped branch pipe moving seat; 2041, special-shaped pipe positioning structure; 2042, fixed seat; 2043, slide plate; 205, straight branch pipe moving seat; 2051, straight branch pipe positioning structure; 210, welding ring correction component; 211, movable piece 1; 212, movable piece 2; 213, welding ring holding notch; 214, sliding pin 1; 215, slide groove 1; 216, sliding pin 2; 217, slide groove 2; 218, elastic block;

[0081] 301, upper positioning block; 302, lower positioning block; 303, wire cutting mold; 3031, wire cutting ring; 3032, wire cutting body; 3033, inward structure;

[0082] 401, moving block; 402, fixed block; 4021, notched groove; 403, inner socket; 404, driving wedge rod; 405, pulling head; 4051, matching blind hole; 4052, magnetic block; 406, radial through hole; 407, guide rod; 408, ear plate; 409, sleeve; 4010, hole adjustment piece; 4011, eccentric block; 4012, rotating plate; 4013, horizontal rod; 4014, horizontal groove; 4015, hook plate; 4016, arc guide groove. DETAILED DESCRIPTION

[0083] 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.

[0084] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0085] Example 1

[0086] like Figure 1 , Figure 2 As shown, a processing method of a refrigeration pipeline component including a steel main pipe-copper branch pipe structure, the manufacturing steps are as follows:

[0087] Step 1: Stainless steel main pipe 101 production:

[0088] Select stainless steel pipe fittings that meet the design requirements for cutting, deburr both ends after cutting, and pre-punch elliptical holes on the pipe fittings;

[0089] The pre-punched elliptical hole is flanging-processed to obtain a flanging structure 1011 with the flanging port flush with the pipe fitting;

[0090] Perform hole calibration on the inner diameter of the flanging structure 1011 and perform shaping on the inner circle of the flanging structure 1011;

[0091] One end of the pipe is expanded to obtain a copper head mounting structure 103;

[0092] Step 2: Making copper branch pipe 102:

[0093] Select copper pipe fittings that meet the design requirements for cutting, shrink one end of the copper pipe fittings, bend the copper pipe fittings that need to be bent, and finally cut the other end of the copper pipe fittings to obtain copper branches with cut ends;

[0094] Step 3: Pipeline fittings production:

[0095] A welding ring is mounted on the outer side of the threaded end of the copper branch tube 102, and the threaded end of the copper branch tube 102 is axially inserted into the inner circle of the flange structure 1011 and ensures that the welding ring fits on the end surface of the flange structure 1011, wherein the threaded end of the copper branch tube 102 and the flange structure 1011 are in a tight fit state;

[0096] Install the copper head and the required welding ring in the copper head installation structure 103;

[0097] The assembled stainless steel main pipe 101 and copper branch pipe 102 are placed vertically on the chain belt of the tunnel furnace, and the assembly is completed in the tunnel furnace;

[0098] After cooling to room temperature, the copper head mounting structure 103 area is locally heated by high frequency to weld the copper connecting pipe 104 to obtain a stainless steel pipeline component.

[0099] By using an elliptical hole that meets the required requirements at the pre-punching position, the elliptical hole is pulled outward to form a flange structure 1011, so that the end surface of the final flange structure 1011 is flush, which can ensure the uniform distribution of subsequent solder on the end surface and ensure the assembly quality. Secondly, the end of the stainless steel main pipe 101 is expanded and a copper head is installed inside it. Subsequently, high-frequency local heating is performed on this part to complete the welding operation of the copper head and the copper branch pipe. In this way, the hardness of the copper pipe 104 is not affected during welding, ensuring the subsequent air tightness detection operation of the main engine factory.

[0100] Example 2

[0101] In the production method, in step 3, as Figures 3 to 9 As shown, the copper branch pipe 102 is axially inserted into the inner circle of the flange structure 1011 on the assembly platform 200.

[0102] The assembly platform 200 is provided with a lower positioning body 201, a vertical plate 202 is installed at the rear side of the assembly platform 200, an upper positioning body 203 is installed on the vertical plate 202, the upper positioning body 203 is vertically adjustable relative to the lower positioning body 201, and the upper positioning body 203 moves downward to cooperate with the lower positioning body 201 to fix the stainless steel main pipe 101.

[0103] The assembly platform 200 is also equipped with a special-shaped branch pipe moving seat 204 and a straight branch pipe moving seat 205. The special-shaped branch pipe moving seat 204 and the straight branch pipe moving seat 205 are slidably matched relative to the assembly platform 200. The special-shaped branch pipe moving seat 204 is provided with a special-shaped pipe positioning structure 2041, and the straight branch pipe moving seat 205 is provided with a straight branch pipe positioning structure 2051.

[0104] A vertical guide groove is provided on the vertical plate 202, and the upper positioning body 203 is slidably fitted in the vertical guide groove. A quick pressing clamp 2021 is installed on the vertical plate 202, and the quick pressing clamp 2021 is used to drive the upper positioning body 203 to adjust its vertical position relative to the lower positioning body 201.

[0105] A guide platform 2001 and a second quick pressing clamp 2002 perpendicular to the stainless steel main pipe 101 are installed on the assembly platform 200. The special-shaped branch pipe moving seat 204 and the straight branch pipe moving seat 205 are slidably fitted on the guide platform 2001. The second quick pressing clamp 2002 drives the special-shaped branch pipe moving seat 204 and the straight branch pipe moving seat 205 to move closer to or away from the stainless steel main pipe 101.

[0106] The lower positioning body 201 is provided with a main pipe lower positioning structure, and the upper positioning body 203 is provided with a main pipe lower positioning structure. Both the main pipe lower positioning structure and the main pipe upper positioning structure include a main pipe positioning groove 2003 and an outer flange positioning groove 2004. The outer flange positioning groove 2004 of the main pipe upper positioning structure is a U-shaped structure.

[0107] The upper positioning body 203 is driven downward by a quick pressing clamp 2021 to press and fix the main pipe installed through the positioning structure under the main pipe. During the downward process, the flange structure 1011 will be guided and centered through the U-shaped structure of the outer flange positioning groove 2004, which is convenient for accurately positioning and fixing the main pipe and ensuring the position of the flange structure 1011 on the main pipe.

[0108] Since one end of the stainless steel main pipe 101 has an elbow area (an end welded with a copper pipe 104), under the action of gravity, the stainless steel main pipe 101 (especially the outer flange) on the lower positioning body 201 will not be in a horizontal state when it is turned up. The special-shaped branch pipe is installed on the special-shaped branch pipe moving seat 14, and the straight branch pipe is installed on the straight branch pipe moving seat 15. The special-shaped branch pipe moving seat 14 and the straight branch pipe moving seat 15 are moved along the corresponding guide platform 101 by the quick pressing clamp 102, so that the assembly operation of each branch pipe can be quickly realized with high efficiency and high assembly accuracy.

[0109] By arranging a main pipe positioning structure (a structure composed of a lower positioning body 201 and an upper positioning body 203) and a branch pipe conveying socket structure (a movable seat and a guide platform 2001) on the assembly platform 200, the special-shaped branch pipe and the straight branch pipe are axially socket-assembled in the flanging structure 1011 on the stainless steel main pipe 101. The main pipe positioning structure is pressed and fixed by the upper positioning body 203 and the lower positioning body 201 so that the flanging structure 1011 is in a horizontal state. The corresponding branch pipe is moved into the flanging structure 1011 and socket-fixed by the special-shaped branch pipe moving seat 204 and the straight branch pipe moving seat 205, which has high efficiency and high precision.

[0110] A fixed seat 2042 is installed on the special-shaped branch pipe moving seat 204. The fixed seat 2042 is vertically arranged. The fixed seat 2042 is located on the side of the special-shaped branch pipe moving seat 204 away from the upper positioning body 203. A slide groove of a vertical stainless steel main pipe 101 is arranged on the special-shaped branch pipe moving seat 204. A slide plate 2043 is slidably matched in the slide groove. A spring is installed between the slide plate 2043 and the fixed seat 2042. The slide plate 2043 is used to limit the top position of the special-shaped branch pipe.

[0111] By providing a slide plate 2043 on the special-shaped branch pipe moving seat 204, the slide plate 2043 is used to restrict the special-shaped branch pipe to a limited extent, so as to prevent the special-shaped branch pipe from deflecting at an angle up and down during assembly, thereby ensuring the assembly accuracy of the special-shaped branch pipe. The exposed size of the special-shaped end of the special-shaped branch pipe is limited (generally about 15 mm), and the position accuracy of the special-shaped branch pipe cannot be effectively ensured only by the special-shaped pipe positioning structure on the horizontal plane, so the above structure is designed to avoid this problem. The special-shaped branch pipe can be effectively fixed by the slide plate 2043, ensuring the stability of the state during axial assembly and ensuring the assembly accuracy of the branch pipe.

[0112] A welding ring correction component 210 is provided on the assembly platform 200. The welding ring correction component 210 is located on the side of the special-shaped branch pipe moving seat 204 and the straight branch pipe moving seat 205 close to the stainless steel main pipe 101. The welding ring correction component 210 is used to correct the welding ring and is sleeved on the outside of the branch pipe.

[0113] The welding ring correction assembly 210 includes a movable piece 1 211 and a movable piece 212. The movable piece 212 is located on a side of the movable piece 1 211 away from the stainless steel main pipe 101. The movable piece 212 is provided with a welding ring receiving notch 213 on a side of the movable piece 1 211 opposite to the movable piece 1 211. The top of the welding ring receiving notch 213 is open. The movable piece 1 211 and the movable piece 2 212 are both symmetrically provided with two groups.

[0114] A sliding pin 214 is provided at the bottom of the movable sheet 211, and a sliding groove 215 provided parallel to the stainless steel main pipe 101 is provided on the assembly platform 200. The sliding pin 214 is slidably installed inside the sliding groove 215. The sliding groove 215 includes a notch 1 provided perpendicular to the stainless steel main pipe 101 and a notch 2 provided parallel to the stainless steel main pipe 101. One end of the notch 2 intersects with one end of the notch 1. The sliding pin 214 is connected to the assembly platform 200 through a spring.

[0115] A second sliding pin 216 is disposed at the bottom of the second movable piece 212 , and a second sliding groove 217 disposed vertically to the stainless steel main pipe 101 is disposed on the assembly platform 200 , and the second sliding pin 216 is slidably installed inside the second sliding groove 217 .

[0116] An elastic block 218 is arranged on one side of the movable seat close to the stainless steel main pipe 101. The elastic block 218 is elastically deformed before the spring on the sliding pin 214 is elastically deformed, so that the welding ring is sleeved on the outer wall of the branch pipe.

[0117] When the movable seat approaches the stainless steel main pipe 101 , the movable piece 212 acts to squeeze the welding ring inside the welding ring receiving notch 213 onto the movable piece 1 211 to complete a full circle.

[0118] The welding ring is put in from the top of the welding ring holding notch 213. When the moving seat approaches the stainless steel main pipe 101, the moving seat will drive the movable piece 2 22 to approach the stainless steel main pipe 101. In the process of approaching the stainless steel main pipe 101, the welding ring will be first processed into a whole circle. Since the originally manufactured circular ring is an open ring structure, there is an axial deviation in the circumferential direction, so this step is required. Secondly, the movable piece 22 will squeeze the elastic block 28 under the obstruction of the movable piece 1 21, so that the movable piece 1 21 and the movable piece 22 will fit the whole circle welding ring on the branch pipe until the elastic block 28 undergoes the maximum elastic deformation to complete the welding ring fitting.

[0119] After the assembly action is completed, the movable piece 1 21 and the movable piece 22 will move together with the moving seat to approach the stainless steel main pipe 101. When approaching the stainless steel main pipe 101, the sliding pin 1 24 will be stretched by the spring installed on itself, and will be pulled after entering the end of the slot 1, so that the movable piece 1 21 will be separated from the movable piece 2 22. When the movable piece 22 is separated, the elastic block 28 will push the welding ring to the side close to the stainless steel main pipe 101 and fit it on the end face of the assembly hole. Through the welding ring correction component 210, the welding ring can be assembled at the orifice position of the flange structure 1011 while assembling each branch pipe. With this structure, the welding ring can be rounded first to prevent axial distortion when the welding ring is mounted on the outside of the branch pipe. Once distortion occurs, the welding liquid will be uneven during the subsequent welding assembly, and the problem of substandard weld air tightness will easily occur. Therefore, when assembling the branch pipe, the welding ring can be neatly mounted on the outside of the branch pipe and assembled together with the axial assembly of the branch pipe, so that the assembly efficiency is better and the assembly effect is better.

[0120] Example 3

[0121] In the production method, Figures 10 to 14 As shown, when the copper pipe end of the elbow needs to be threaded, the upper positioning block 301 and the lower positioning block 302 are used to compress and fix the copper pipe. The vertical position height of the upper positioning block 301 relative to the lower positioning block 302 is adjustable. A cylinder is installed at one end of the upper positioning block 301 facing away from the lower positioning block 302. The cylinder is used to adjust the vertical position height of the upper positioning block 301 relative to the lower positioning block 302. The lower positioning block 302 is fixedly installed.

[0122] The upper positioning block 301 and the lower positioning block 302 are both provided with special-shaped positioning structures on the opposite sides thereof, and the upper positioning block 301 and the lower positioning block 302 position the special-shaped pipe fittings via the special-shaped positioning structures.

[0123] The axial position of the exposed end of the copper pipe fitting, which is pressed and fixed by the upper positioning block 301 and the lower positioning block 302, is adjusted through the wire cutting mold 303, and the exposed end is shaped and wire cut.

[0124] The cutting mold 303 includes a cutting ring 3031 with an adjustable axial position relative to the mouth of the special-shaped pipe fitting. The cutting bodies 3032 are evenly distributed in the cutting ring 3031. The cutting ring 3031 is provided with a trumpet mouth near the port of the special-shaped pipe fitting for shaping the mouth of the special-shaped pipe fitting. The cutting bodies 3032 are used to evenly cut the surface of the mouth after shaping.

[0125] The cutout body 3032 is an isosceles triangle structure, the angles between the two sides of the cutout body 3032 are 15-25°, and the thickness of the cutout body 3032 is 0.1-0.15 mm;

[0126] The areas on both sides of the cutting body 3032 close to the cutting ring 3031 are both concave arc structures, and the cutting stress can be released by using the concave arc structure. The radius of the arc structure is 0.02-0.05mm. The cutting body 3032 is obtained by wire cutting.

[0127] The thickness of the engraved body 3032 near the end of the special-shaped pipe fitting is smaller than the thickness away from the end of the special-shaped pipe fitting. By strictly limiting the thickness of the engraved body 3032, it is easy to obtain a engraved depth on the outer wall of the pipe mouth away from the pipe mouth that gradually decreases to zero, so that the welding liquid flows to the side close to the stainless steel pipe fitting.

[0128] An end of the engraving ring 3031 away from the port of the special-shaped pipe fitting is provided with an inward-retracting structure 3033 , which is used to form a certain slope or taper at the port of the special-shaped pipe fitting, so as to facilitate the axial assembly of the branch pipe in the flanging structure 1011 .

[0129] The inward-retracting structure 3033 is an annular structure arranged in the wire cutting ring 3031 at the end away from the special-shaped pipe port. The width of the inward-retracting structure 3033 is 2-4mm. The size of the end of the inward-retracting structure 3033 close to the special-shaped pipe port is larger than the size of the end away from the special-shaped pipe port, and the angle between the inner circle of the inward-retracting structure 3033 and the inner wall of the wire cutting ring 3031 is 2-5°. The mouth of the special-shaped pipe fitting after cutting is trimmed by the inward structure 3033 to form a certain taper to facilitate axial socket installation on the stainless steel main pipe 101. When the stainless steel main pipe 101 is welded in the tunnel furnace, it should be noted that before the socket is inserted into the stainless steel main pipe 101, a welding ring with an open ring structure with a diameter of 0.1-1mm is first set on the mouth of the special-shaped pipe fitting. After the socket is inserted, the welding ring will fit on the outer wall of the stainless steel pipe fitting port, melt in the tunnel furnace along the cut wire structure, and enter the tight fit seam between the mouth of the special-shaped pipe fitting and the port of the flanging structure 1011 to complete the assembly.

[0130] The upper positioning block 301 and the lower positioning block 302 are used to press and fix the body of the area near the short port of the special-shaped pipe fitting up and down, limit the special-shaped part of the special-shaped pipe fitting, prevent the angle and position deviation from occurring when the groove is cut, ensure the position of the port of the special-shaped pipe fitting and the size of the exposed hole, and shape the port of the special-shaped pipe fitting through the flared mouth at the end of the wire cutting ring 3031. The reason is that: this type of pipe fitting requires multiple pipe bending operations to obtain, but it needs to be assembled on the stainless steel main pipe in the future. In order to ensure the welding quality of the weld, the pipe mouth of this type of pipe fitting has been wired in the past to achieve the capillary drainage of the welding liquid. If the wire cutting step is placed before the pipe bending operation, due to the limited length reserved at the end position of the pipe mouth (about 15mm), during the pipe bending operation, the surface of the wire cutting port needs to be clamped, which will cause clamping damage to the wire cutting surface in the pipe mouth area, affecting the capillary drainage effect, and in severe cases, causing the pipe mouth to deform. Therefore, the wire cutting operation needs to be placed after the tube bending operation. However, this method will cause the tube mouth to deform during the forming process because the port is too close to the tube bending area. Although direct wire cutting can be achieved, it cannot ensure accurate wire cutting on the outer wall of the tube mouth due to the deformation of the tube mouth, which will lead to the uneven capillary drainage of the welding liquid in the later stage, which may easily lead to the problem of insufficient air tightness of the pipe fitting. At the same time, the outer wall of the tube mouth of the pipe fitting is axially wired by the wire cutting body 3032 inside the wire cutting ring 3031, and the end of the wire cutting ring 303 away from the special-shaped pipe fitting can be installed with a cylinder or other driver to adjust the axial position.

[0131] During specific use, the upper positioning block 301 is located on the top of the lower positioning block 302, the special-shaped pipe fitting is installed on the special-shaped positioning structure of the lower positioning block 3020, and the upper positioning block 301 is moved downward through the special-shaped positioning structure thereon to press and fix the special-shaped pipe fitting, the exposed length of the pipe mouth of the special-shaped pipe fitting is limited, and the driver drives the wire cutting ring 303 axially close to the positioning structure to shape the pipe mouth of the special-shaped pipe fitting first and then cut the wire in one step.

[0132] Example 4

[0133] In the production method, Figures 15 to 19 As shown, in step 1, when flanging the pre-punched elliptical hole, the stainless steel pipe fitting is installed in the limiting structure on the moving block 401, and the moving block 401 is slidably matched on the fixed block 402. The fixed block 402 is provided with a notch groove 4021, and the notch groove 4021 is used to correspond to the flanging structure 1011. The fixed block 402 is provided with a concave positioning structure, and the stainless steel pipe fitting is radially positioned by the limiting structure and the positioning structure. A cylinder can be provided on the side of the moving block 401 away from the fixed block 402, so that the moving block 401 can approach or move away from the fixed block 402.

[0134] By socketing the inner bell-and-spigot pipe 403 in the stainless steel pipe fitting, a driving wedge rod 404 is slidably fitted inside the inner bell-and-spigot pipe 403, a radial through hole 406 is provided on the side wall of the inner bell-and-spigot pipe 403, a pulling head 405 is slidably fitted inside the radial through hole 406, an oblique guide groove is provided on the end side wall of the driving wedge rod 404, a guide block is provided at the bottom of the pulling head 405, the guide block and the oblique guide groove are slidably fitted, the axial movement of the driving wedge rod 404 in the inner bell-and-spigot pipe 403 drives the pulling head 405 to extend or retract inward or outward in the radial through hole 406, and when the pulling head 405 extends outward, the elliptical hole is pulled outward and flanged.

[0135] A guide rod 407 is installed on the fixed block 402. A spring and an ear plate 408 are mounted on the guide rod 407. The ear plate 408 is located on the top of the spring. A sleeve 409 is fixed on the ear plate 408. A hole calibration member 4010 is rotatably installed in the sleeve 409. The hole calibration member 4010 is located directly above the radial through hole 406. The hole calibration member 4010 is located on the top of the notch groove 4021. The vertical position of the hole calibration member 4010 relative to the notch groove 4021 is adjustable. A forming portion, a socket portion, and a gradient portion arranged between the forming portion and the socket portion are installed on the hole calibration member 4010. The flange structure 1011 is flanged using the hole adjustment piece 4010 to ensure that the axial dimensions are consistent, which is conducive to the socket-fit installation of the branch pipe. At the same time, the inner circle of the flange structure 1011 is shaped. When the pulling head 405 is pulled out and flanging, flanging is required due to the draft angle. At the same time, due to the pulling out of the pipe wall, uneven force will occur during the pulling out process, which will lead to the problem of the inner circle of the flange structure being not round.

[0136] A matching blind hole 4051 is provided at the end of the pulling head 405. The matching blind hole 4051 is adapted to the socket part. A hooking groove is provided at the root of the matching blind hole 4051 and a magnetic block 4052 is provided in the groove. An eccentric block 4011 is provided on the outside of the socket part. The magnetic block 4052 is used to absorb the eccentric block 4011 so that the eccentric block 4011 is offset in the matching blind hole 4051 and forms a hooking structure with the hooking groove. The matching blind hole 4051 is provided for the eccentric block 4011 to enter. The matching blind hole 4051 is eccentrically arranged at the top of the pulling head 405. The magnetic block 4952 is located on one side of the hooking groove and is used to absorb the eccentric block 4011 and drive the eccentric block 4011 to deflect a certain angle so as to form a hooking structure, so as to realize the hole calibration operation when the pulling head 405 is retracted, which is completed in one time and has high coaxiality.

[0137] A rotating crown is provided on the top of the hole adjustment member 4010, and the magnetic block 4052 and the eccentric block 4011 are separated by operating the rotating crown. When separation is required after the hole adjustment is completed, the magnetic block 4052 and the eccentric block 4011 are separated by rotating the Xi'an rotating crown.

[0138] The moving block 401 is provided with an arc groove, in which a rotating plate 4012 is slidably fitted, and an avoidance groove is provided on the top of the rotating plate 4012. The avoidance groove and the notch groove 4021 are surrounded to form a flange outer molding area, and a horizontal rod 4013 is installed on the top side of the rotating plate 4012.

[0139] A horizontal groove 4014 for positioning the horizontal rod 4013 is provided on one side of the top of the fixed block 402 facing the movable block 401 , and the horizontal rod 4013 is selectively adapted in the horizontal groove 4014 .

[0140] The side of the fixed block 402 is rotatably mounted with a hook plate 4015, which is used to hook the horizontal rod 4013 and limit it in the horizontal groove 4014. The rear side of the hook plate 4015 is provided with an arc guide groove 4016, in which a pin is installed, and the pin is installed on the side of the fixed block 402. When in use, after the pipe is clamped, the horizontal rod 4013 is pushed up and enters the horizontal groove 4014, and the hook plate 4015 is used to hook and limit the horizontal rod 4013 in the horizontal groove 4014, thereby realizing the combination of the avoidance groove and the notch groove 4021 to ensure the molding quality. After all operations are completed, the hook plate 4015 is pushed up to separate from the horizontal rod 4013, and the rotating plate 4012 is rotated down to reset and take out the pipe.

[0141] When processing the outer flanging of the elliptical hole, the avoidance groove and the notch groove 4021 are used to enclose the outer forming area of ​​the flanging to engage the tube wall of the flanging part to ensure that the tube wall will not undergo significant deformation, thereby being able to accurately control the end face height and the thickness of the flanging structure 1011 to be relatively uniform.

[0142] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. The replacement may be a replacement of a part of the structure, device, method step, or a complete technical solution. Any equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A method for processing a refrigeration pipeline component including a steel main pipe-copper branch pipe structure, characterized in that: The production steps are as follows: Step 1: Making the stainless steel main pipe (101): Select stainless steel pipe fittings that meet the design requirements for cutting, deburr both ends after cutting, and pre-punch elliptical holes on the pipe fittings; The pre-punched elliptical hole is flanging-processed to obtain a flanging structure (1011) with the flanging port flush with the pipe fitting; Performing hole calibration on the inner diameter of the flange structure (1011) and shaping the inner circle of the flange structure (1011); Expanding one end of the pipe fitting to obtain a copper head mounting structure (103); Step 2: Making the copper branch pipe (102): Select copper pipe fittings that meet the design requirements for cutting, shrink one end of the copper pipe fittings, bend the copper pipe fittings that need to be bent, and finally cut the other end of the copper pipe fittings to obtain copper branches with cut ends; Step 3: Pipeline fittings production: A welding ring is sleeved on the outer side of the threaded end of the copper branch tube (102), the threaded end of the copper branch tube (102) is axially inserted into the inner circle of the flange structure (1011) and the welding ring is ensured to fit on the end surface of the flange structure (1011), wherein the threaded end of the copper branch tube (102) and the flange structure (1011) are in a tight fit state; Installing the copper head and the required welding ring in the copper head installation structure (103); The assembled stainless steel main pipe (101) and copper branch pipe (102) are placed vertically on the chain belt of the tunnel furnace, and the assembly is completed in the tunnel furnace; After cooling to room temperature, the copper head installation structure (103) area is locally heated by high frequency to weld the copper pipe (104) to obtain a stainless steel pipeline component.

2. A method for processing a refrigeration pipeline component comprising a steel main pipe-copper branch pipe structure according to claim 1, characterized in that: In step 3, the copper branch pipe (102) is axially inserted into the inner circle of the flange structure (1011) on the assembly platform (200); The assembly platform (200) is provided with a lower positioning body (201), a vertical plate (202) is installed on the rear side of the assembly platform (200), an upper positioning body (203) is installed on the vertical plate (202), the upper positioning body (203) is vertically adjustable relative to the lower positioning body (201), and the upper positioning body (203) is downwardly moved to cooperate with the lower positioning body (201) to fix the stainless steel main pipe (101); A special-shaped branch pipe moving seat (204) and a straight branch pipe moving seat (205) are also installed on the assembly platform (200). The special-shaped branch pipe moving seat (204) and the straight branch pipe moving seat (205) are slidably matched relative to the assembly platform (200). The special-shaped branch pipe moving seat (204) is provided with a special-shaped pipe positioning structure (2041), and the straight branch pipe moving seat (205) is provided with a straight branch pipe positioning structure (2051). A fixed seat (2042) is installed on the special-shaped branch pipe moving seat (204), the fixed seat (2042) is arranged vertically, and the fixed seat (2042) is located on the side of the special-shaped branch pipe moving seat (204) away from the upper positioning body (203). A slide groove vertical to the stainless steel main pipe (101) is arranged on the special-shaped branch pipe moving seat (204), and a slide plate (2043) is slidably matched in the slide groove. A spring is installed between the slide plate (2043) and the fixed seat (2042), and the slide plate (2043) is used to limit the top position of the special-shaped branch pipe; A vertical guide groove is provided on the vertical plate (202), and the upper positioning body (203) is slidably fitted in the vertical guide groove. A quick pressing clamp (221) is installed on the vertical plate (202), and the quick pressing clamp (221) is used to drive the upper positioning body (203) to adjust its vertical position relative to the lower positioning body (201); A guide platform (2001) and a second quick pressing clamp (2002) vertically mounted on the stainless steel main pipe (101) are installed on the assembly platform (200); a special-shaped branch pipe moving seat (204) and a straight branch pipe moving seat (205) are slidably matched on the guide platform (2001); and the second quick pressing clamp (2002) drives the special-shaped branch pipe moving seat (204) and the straight branch pipe moving seat (205) to move closer to or farther from the stainless steel main pipe (101).

3. A method for processing a refrigeration pipeline component comprising a steel main pipe-copper branch pipe structure according to claim 2, characterized in that: The lower positioning body (201) is provided with a main pipe lower positioning structure, and the upper positioning body (203) is provided with a main pipe lower positioning structure; The main pipe lower positioning structure and the main pipe upper positioning structure both comprise a main pipe positioning groove (2003) and an outer flange positioning groove (2004); the outer flange positioning groove (2004) of the main pipe upper positioning structure is a U-shaped structure.

4. A method for processing a refrigeration pipeline component comprising a steel main pipe-copper branch pipe structure according to claim 2, characterized in that: A welding ring correction component (210) is arranged on the assembly platform (200). The welding ring correction component (210) is located on one side of the special-shaped branch pipe moving seat (204) and the straight branch pipe moving seat (205) close to the stainless steel main pipe (101). The welding ring correction component (210) is used to correct the welding ring and is sleeved on the outside of the branch pipe.

5. A method for processing a refrigeration pipeline component comprising a steel main pipe-copper branch pipe structure according to claim 2, characterized in that: The welding ring correction component (210) comprises a movable piece 1 (211) and a movable piece 2 (212), wherein the movable piece 2 (212) is located on a side of the movable piece 1 (211) away from the stainless steel main pipe (101), and a welding ring containing notch (213) is provided on a side of the movable piece 2 (212) opposite to the movable piece 1 (211), and the top of the welding ring containing notch (213) is open, and the movable piece 1 (211) and the movable piece 2 (212) are both symmetrically provided with two groups; A sliding pin 1 (214) is provided at the bottom of the movable sheet 1 (211), a sliding groove 1 (215) provided parallel to the stainless steel main pipe (101) is provided on the assembly platform (200), the sliding pin 1 (214) is slidably installed inside the sliding groove 1 (215), the sliding groove 1 (215) includes a notch 1 provided perpendicular to the stainless steel main pipe (101) and a notch 2 provided parallel to the stainless steel main pipe (101), one end of the notch 2 intersects with one end of the notch 1, and the sliding pin 1 (214) is connected to the assembly platform (200) via a spring; A second sliding pin (216) is provided at the bottom of the second movable piece (212), and a second sliding groove (217) vertically provided on the stainless steel main pipe (101) is provided on the assembly platform (200), and the second sliding pin (216) is slidably installed inside the second sliding groove (217); An elastic block (218) is arranged on one side of the movable seat close to the stainless steel main pipe (101), and the elastic block (218) is elastically deformed before the spring on the sliding pin 1 (214) is elastically deformed, so that the welding ring is sleeved on the outer wall of the branch pipe; When the movable seat approaches the stainless steel main pipe (101), the movable piece 2 (212) is used to squeeze the welding ring inside the welding ring receiving notch (213) onto the movable piece 1 (211) to complete a full circle.

6. A method for processing a refrigeration pipeline component comprising a steel main pipe-copper branch pipe structure according to claim 2, characterized in that: When the copper pipe end of the bent pipe needs to be threaded, the upper positioning block (301) and the lower positioning block (302) are used to press and fix the copper pipe, and the vertical position height of the upper positioning block (301) relative to the lower positioning block (302) is adjustable; A special-shaped positioning structure is provided on one side opposite to the upper positioning block (301) and the lower positioning block (302), and the upper positioning block (301) and the lower positioning block (302) position the special-shaped pipe fitting via the special-shaped positioning structure; The axial position of the exposed end of the copper pipe fitting is adjusted by pressing and fixing the exposed end of the copper pipe fitting with the upper positioning block (301) and the lower positioning block (302) through the wire cutting die (303), and the exposed end of the copper pipe fitting is shaped and wire cut; The cutting mold (303) comprises a cutting ring (3031) whose axial position relative to the pipe mouth of the special-shaped pipe fitting is adjustable, and cutting bodies (3032) are evenly arranged in the cutting ring (3031). The cutting ring (3031) is provided with a bell mouth near the port of the special-shaped pipe fitting for shaping the pipe mouth of the special-shaped pipe fitting, and the cutting body (3032) is used to evenly cut the surface of the pipe mouth after shaping.

7. A method for processing a refrigeration pipeline component comprising a steel main pipe-copper branch pipe structure according to claim 6, characterized in that: The cutout body (3032) is an isosceles triangle structure, the angles between the two sides of the cutout body (3032) are 15-25°, and the thickness of the cutout body (3032) is 0.1-0.15 mm; The areas on both sides of the cutting body (3032) close to the cutting ring (3031) are both concave arc structures, and the radius of the arc structure is 0.02-0.05mm. The cutting body (3032) is obtained by wire cutting; The thickness of the cutting body (3032) near the end of the special-shaped pipe fitting is smaller than the thickness at a position far from the end of the special-shaped pipe fitting. By strictly limiting the thickness of the cutting body (3032), it is easy to obtain a cutting depth on the outer wall of the pipe opening far from the pipe opening, which gradually decreases to zero, so that the welding liquid flows to the side close to the stainless steel pipe fitting; An end of the engraving ring (3031) away from the port of the special-shaped pipe fitting is provided with an inward-retracting structure (3033), and the inward-retracting structure (3033) is used to form a certain slope or taper at the port of the special-shaped pipe fitting; The retracted structure (3033) is an annular structure arranged in the wire cutting ring (3031) at one end away from the special-shaped pipe port, the width of the retracted structure (3033) is 2-4 mm, the size of the end of the retracted structure (3033) close to the special-shaped pipe port is larger than the size of the end away from the special-shaped pipe port, and the angle between the inner circle of the retracted structure (3033) and the inner wall of the wire cutting ring (3031) is 2-5°.

8. A method for processing a refrigeration pipeline component having a steel main pipe-copper branch pipe structure according to claim 6, characterized in that: In step 1, when flanging the pre-punched elliptical hole, the stainless steel pipe fitting is installed in the limiting structure on the moving block (401), the moving block (401) is slidably matched on the fixed block (402), the fixed block (402) is provided with a notch groove (4021), and the fixed block (402) is provided with an inwardly concave positioning structure, and the stainless steel pipe fitting is radially positioned by the limiting structure and the positioning structure; By inserting an inner bell-and-spigot pipe (403) into a stainless steel pipe fitting, a driving wedge rod (404) is slidably matched inside the inner bell-and-spigot pipe (403), a radial through hole (406) is provided on the side wall of the inner bell-and-spigot pipe (403), a pulling head (405) is slidably matched inside the radial through hole (406), an oblique guide groove is provided on the end side wall of the driving wedge rod (404), a guide block is provided at the bottom of the pulling head (405), the guide block and the oblique guide groove are slidably matched, and the movement of the driving wedge rod (404) in the inner bell-and-spigot pipe (403) drives the pulling head (405) to extend or retract inside or outside the radial through hole (406), and the elliptical hole is pulled outward and flanging; A guide rod (407) is mounted on the fixed block (402), a spring and an ear plate (408) are sleeved on the guide rod (407), the ear plate (408) is located on the top of the spring, a sleeve (409) is fixed on the ear plate (408), a hole calibration member (4010) is rotatably mounted in the sleeve (409), the hole calibration member (4010) is located just above the radial through hole (406), the hole calibration member (4010) is located on the top of the notch groove (4021), the vertical position of the hole calibration member (4010) relative to the notch groove (4021) is adjustable, and a forming portion, a socket portion, and a gradual change portion arranged between the forming portion and the socket portion are mounted on the hole calibration member (4010); The end of the pull head (405) is provided with a matching blind hole (4051), and the matching blind hole (4051) and the socket part are adapted; A hooking groove is arranged at the root of the matching blind hole (4051), and a magnetic block (4052) is arranged in the groove; an eccentric block (4011) is arranged on the outer side of the socket part; the magnetic block (4052) is used to absorb the eccentric block (4011) so that the eccentric block (4011) is offset in the matching blind hole (4051) to form a hooking structure; A rotating crown is provided on the top of the hole adjustment member (4010), and the magnetic attraction block (4052) and the eccentric block (4011) are separated by operating the rotating crown.

9. A method for processing a refrigeration pipeline component comprising a steel main pipe-copper branch pipe structure according to claim 8, characterized in that: The moving block (401) is provided with an arc groove, a rotating plate (4012) is slidably fitted in the arc groove, a avoiding groove is provided on the top of the rotating plate (4012), the avoiding groove and the notch groove (4021) are surrounded to form a flange outer molding area, and a horizontal rod (4013) is installed on the top side of the rotating plate (4012); A horizontal groove (4014) for positioning the horizontal rod (4013) is provided on one side of the top of the fixed block (402) facing the movable block (401), and the horizontal rod (4013) is selectively adapted in the horizontal groove (4014).

10. A method for processing a refrigeration pipeline component comprising a steel main pipe-copper branch pipe structure according to claim 9, characterized in that: A hook plate (4015) is rotatably mounted on the side of the fixed block (402), and the hook plate (4015) is used to hook the horizontal rod (4013) and be restricted in the horizontal groove (4014). An arc guide groove (4016) is arranged on the rear side of the hook plate (4015), and a pin is installed in the arc guide groove (4016), and the pin is installed on the side of the fixed block (402).

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