A method for processing a refrigeration pipe member including a steel main pipe-copper branch pipe structure

Abstract

The application discloses a processing method of a refrigeration pipeline piece containing a steel main pipe-copper branch pipe structure, a copper head mounting structure is obtained through flaring treatment at the end of a stainless steel main pipe, a copper head is assembled in the structure, and welding is completed through solder in a tunnel furnace, local high-frequency heating is performed on the copper head mounting structure area to complete the welding of the copper head and the copper branch pipe, and thus the problem that the copper connecting pipe becomes soft and cannot meet the air tightness detection due to the direct welding of the copper connecting pipe in the tunnel furnace can be avoided. An elliptical hole which meets the final end face and is high and meets the size requirement of the design flange structure is pre-punched on the stainless steel pipe piece, the end part of the flange structure can be ensured to be flush during the forming of the outer flange, and thus the solder of the uniform welding bead in the tunnel furnace can be ensured, and the pipe piece quality can be ensured.

Description

Technical Field

[0001] This invention relates to refrigeration system piping manufacturing technology, specifically a processing method for refrigeration piping components comprising a steel main pipe and copper branch pipe structure. Background Technology

[0002] Refrigeration system piping components are generally welded together from a large-diameter main pipe and a smaller-diameter branch pipe. Traditionally, refrigeration system piping components are made of copper pipes, which are expensive, resulting in high costs. Piping components made of stainless steel main pipes and copper branch pipes have emerged on the market, using stainless steel instead of copper, thus saving costs compared to all-copper piping components. However, there are some problems with the manufacturing of these components:

[0003] 1. Most of these pipe fittings are manufactured using a tunnel furnace to complete the welding of stainless steel main pipes and copper branch pipes and copper connecting pipes. After the pipe fittings are manufactured, when they arrive at the OEM factory, the copper connecting pipe ends on the main pipe need to be tested for air tightness. The air tightness test requires sealing the copper connecting pipe ends under a certain pressure. However, due to the high temperature treatment in the tunnel furnace, the copper connecting pipes soften and cannot meet the requirements of the air tightness test.

[0004] 2. When processing this type of pipe fitting, it is necessary to pull outwards the pre-punched round hole to form a flange. If the area of ​​the pre-punched round hole is pulled directly, it will cause uneven ends and a crescent shape on the end face. The appearance of this crescent shape will make it impossible to guarantee the uniformity of the weld in subsequent welding operations. It is easy for material to be missing at both ends due to the accumulation in the middle of the crescent shape, which will lead to pipe fitting quality problems.

[0005] 3. For this type of pipe fitting, after the flange structure is formed, the existing technology lacks the operation of shaping the inner circle of the flange structure. This can easily lead to problems such as the inner circle of the flange not being round and the axial dimensions being inconsistent when the flange is formed by pulling outwards. When assembling copper branch pipes, local looseness may occur, which will prevent the welding liquid from effectively filling the weld bead, thus causing pipe fitting quality problems.

[0006] 4. For this type of pipe fitting, since the copper branch pipe is relatively softer than the stainless steel pipe fitting, if the installation is not kept coaxial during the assembly process, it is easy to cause uneven thickness of the circumferential weld bead, resulting in misalignment between the axis of the copper branch pipe and the flange structure, leading to pipe fitting quality problems. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the inventors, through practice and summarization, derived the technical solution of this invention, which adopts the following technical solution:

[0008] A method for fabricating a refrigeration piping component comprising a steel main pipe and copper branch pipe structure, comprising the following steps:

[0009] Step 1: Fabrication of the stainless steel main pipe:

[0010] Select qualified stainless steel pipe fittings for cutting. After cutting, deburr both ends and pre-punch elliptical holes in the pipe fittings.

[0011] The pre-punched elliptical hole is flanged to obtain a flanged structure with the flanged ends at the same height on the pipe fitting.

[0012] The inner diameter of the flange structure is adjusted, and the inner circle of the flange structure is shaped.

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

[0014] Step 2, Copper branch pipe fabrication:

[0015] Select copper pipe fittings that meet the design requirements for cutting, reduce the end of the copper pipe fitting, bend the copper pipe fittings that need to be bent into shape, and finally engrave the other end of the copper pipe fitting.

[0016] Step 3, Piping fitting fabrication:

[0017] A welding ring is fitted on the outside of the wire-cut end of the copper branch pipe. The wire-cut end of the copper branch pipe is axially inserted into the inner circle of the flange structure, and the welding ring is fitted to the end face of the flange structure. The wire-cut end of the copper branch pipe and the flange structure are in a tight fit.

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

[0019] The assembled stainless steel main pipe and copper branch pipe are placed vertically on the chain belt of the tunnel furnace, and the assembly is completed inside the tunnel furnace.

[0020] After cooling to room temperature, copper pipes are welded to the copper head mounting structure area by high-frequency local heating to obtain stainless steel pipe fittings.

[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, and a vertical plate is installed on the rear side of the assembly platform. An upper positioning body is installed on the vertical plate. The vertical position of the upper positioning body relative to the lower positioning body is adjustable. The upper positioning body moves downward to cooperate with the lower positioning body to fix the stainless steel main pipe.

[0023] The assembly platform is also equipped with irregularly shaped branch pipe moving seats and straight branch pipe moving seats. The irregularly shaped branch pipe moving seats and straight branch pipe moving seats slide relative to the assembly platform. The irregularly shaped branch pipe moving seats are equipped with irregularly shaped pipe positioning structures, and the straight branch pipe moving seats are equipped with straight branch pipe positioning structures.

[0024] A fixed seat is installed on the irregular branch pipe moving seat. The fixed seat is set vertically and is located on the side of the irregular branch pipe moving seat away from the upper positioning body. The irregular branch pipe moving seat is provided with a slide groove for the vertical stainless steel main pipe. A sliding plate is slidably fitted in the slide groove. A spring is installed between the sliding plate and the fixed seat. The sliding plate is used to limit the top position of the irregular branch pipe.

[0025] A vertical guide groove is provided on the vertical plate, and the upper positioning body slides in the vertical guide groove. A quick clamp is installed on the vertical plate, which is used to make the vertical position of the upper positioning body relative to the lower positioning body adjustable.

[0026] The assembly platform is equipped with a guide table for the vertical stainless steel main pipe and a second quick clamp. The irregular branch pipe moving seat and the straight branch pipe moving seat slide on the guide table. The second quick clamp moves the irregular branch pipe moving seat and the straight branch pipe moving seat closer to or further away from the stainless steel main pipe.

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

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

[0029] Preferably, the assembly platform is provided with a weld ring correction component, which is located on the side of the irregular branch pipe moving seat and the straight branch pipe moving seat near the stainless steel main pipe. The weld ring correction component is used to correct the weld ring and fit it on the outside of the branch pipe.

[0030] Preferably, the welding ring correction assembly includes a movable piece one and a movable piece two. The movable piece two is located on the side of the movable piece one away from the stainless steel main pipe, and a welding ring holding slot is provided on the side of the movable piece two opposite to the movable piece one. The top of the welding ring holding slot is open. Two sets of movable pieces one and two are symmetrically arranged.

[0031] The bottom of the movable piece 1 is provided with a sliding pin 1, and the assembly platform is provided with a sliding groove 1 parallel to the stainless steel main pipe. The sliding pin 1 is slidably installed inside the sliding groove 1. The sliding groove 1 includes a slot 1 perpendicular to the stainless steel main pipe and a slot 2 parallel to the stainless steel main pipe. One end of the slot 2 and one end of the slot 1 meet. The sliding pin 1 is connected to the assembly platform by a spring.

[0032] The bottom of the second movable piece is provided with a sliding pin, and the assembly platform is provided with a vertical stainless steel main pipe with a sliding groove, and the sliding pin is slidably installed inside the sliding groove.

[0033] An elastic block is provided on the side of the movable seat near the stainless steel main pipe. The elastic block undergoes elastic deformation before the spring on the sliding pin deforms, thus completing the welding ring fitting on the outer wall of the branch pipe.

[0034] As the movable seat approaches the stainless steel main pipe, the second movable piece presses the weld ring inside the slot into the first movable piece to complete the roundness.

[0035] Preferably, when it is necessary to scribing the end of a copper pipe fitting that requires bending, the copper pipe fitting is clamped and fixed using an upper positioning block and a lower positioning block, and the vertical position of the upper positioning block relative to the lower positioning block is adjustable;

[0036] The upper and lower positioning blocks are each provided with an irregular positioning structure on their opposite sides, and the upper and lower positioning blocks are positioned by the irregular positioning structure.

[0037] The axial position of the exposed end of the copper pipe fitting is adjusted by the wire-cutting mold, which is pressed and fixed by the upper and lower positioning blocks, and the exposed end is shaped and wire-cut.

[0038] The wire engraving mold includes a wire engraving ring whose axial position relative to the pipe opening of the irregular pipe fitting is adjustable. Wire engraving bodies are evenly distributed inside the wire engraving ring. A flared opening is provided near the pipe opening of the wire engraving ring for shaping the pipe opening of the irregular pipe fitting. The wire engraving bodies are used to evenly engrave wires on the surface of the pipe opening after shaping.

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

[0040] The two sides of the wire cutter body, near the wire cutter ring, are both concave arc-shaped structures with a radius of 0.02-0.05 mm. The wire cutter body is obtained by wire cutting.

[0041] The thickness of the wire cutter near the end of the irregular pipe fitting is less than the thickness away from the end of the irregular pipe fitting. By strictly limiting the thickness of the wire cutter, it is easy to obtain a wire cutter depth on the outer wall of the pipe opening that gradually decreases to zero away from the pipe opening, so that the welding liquid flows to the side closer to the stainless steel pipe fitting.

[0042] The end of the wire ring away from the port of the irregular pipe fitting has an inward structure, which is used to form a certain slope or taper at the port of the irregular pipe fitting.

[0043] The inner structure is a ring-shaped structure set inside the wire-cutting ring at the end away from the port of the irregular pipe fitting. The width of the inner structure is 2-4mm. The size of the inner structure at the end closer to the port of the irregular pipe fitting is larger than the size of the end away from the port of the irregular pipe fitting. The included angle between the inner ring of the inner 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, the fixed block is provided with a notch groove, and the fixed block is provided with a recessed positioning structure, and the stainless steel pipe fitting is radially positioned by the limiting structure and the positioning structure.

[0045] By inserting an inner socket tube into a stainless steel pipe fitting, a drive wedge rod is slidably fitted inside the inner socket tube. A radial through hole is provided on the side wall of the inner socket tube, and a puller is slidably fitted inside the radial through hole. An oblique guide groove is provided on the side wall of the end of the drive wedge rod, and a guide block is provided at the bottom of the puller. The guide block and the oblique guide groove are slidably fitted. The movement of the drive wedge rod inside the inner socket tube causes the puller to extend or retract in and out of the radial through hole, and to pull out and flip the elliptical hole.

[0046] A guide rod is installed on the fixed block, and a spring and an ear plate are fitted on the guide rod. The ear plate is located on top of the spring, and a sleeve is fixed on the ear plate. A hole-calibrating component is rotatably installed inside the sleeve. The hole-calibrating component is located directly above the radial through hole and at the top of the notch groove. The vertical position of the hole-calibrating component relative to the notch groove is adjustable. A forming part and a socket part are installed on the hole-calibrating component, as well as a gradient part set between the forming part and the socket part.

[0047] The end of the plug is provided with a mating blind hole, which is compatible with the socket part;

[0048] The blind hole is provided with a hook groove and a magnetic block is provided in the groove. An eccentric block is provided on the outside of the socket. The magnetic block is used to attract the eccentric block so that the eccentric block is biased in the blind hole to form a hook structure.

[0049] The top of the hole-calibrating component is equipped with a rotating handle, which is operated to separate the magnetic block and the eccentric block.

[0050] Preferably, the movable block is provided with an arc-shaped groove, a rotating plate is slidably fitted in the arc-shaped groove, a clearance groove is provided on the top of the rotating plate, the clearance groove and the notch groove surround the flanged outer forming area, and a horizontal bar is installed on the top side of the rotating plate.

[0051] The top of the fixed block has a horizontal groove on the side facing the moving block for positioning the horizontal rod, and the horizontal rod can be selectively fitted into the horizontal groove.

[0052] Preferably, a hook plate is rotatably mounted on the side of the fixing block. The hook plate is used to hook a horizontal bar and confine it within a horizontal groove. An arc-shaped guide groove is provided on the rear side of the hook plate, and a pin is installed in the arc-shaped guide groove. The pin is installed on the side of the fixing block.

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

[0054] To address problem 1, this invention involves flaring the end of the stainless steel main pipe to obtain a copper head mounting structure. The copper head is then assembled inside this structure and welded in a tunnel furnace using solder. High-frequency local heating is applied to the area of ​​the copper head mounting structure to complete the welding of the copper head and the copper branch pipe. This avoids the problem of the copper pipe becoming soft and unable to meet the airtightness test requirements due to direct welding in the tunnel furnace.

[0055] To address issue 2, this invention pre-punches elliptical holes on stainless steel pipe fittings that meet the final end face height and the design flange structure size requirements. This ensures that the flange structure ends are flush during the outer flange forming process, thereby ensuring the homogenization of the weld bead in the tunnel furnace and guaranteeing the quality of the pipe fittings.

[0056] To address problem 3, this invention performs hole alignment within the outer flange structure formed by drawing. This hole alignment ensures the flange structure is rounded, facilitating uniform melting and distribution of the weld ring within the weld bead after the copper branch pipe is installed in the tunnel furnace, thus guaranteeing the quality of the pipe fitting. This invention employs a method of outward movement of the drawing head and inward movement of the flange alignment hole, efficiently completing the flange forming operation.

[0057] To address problem 4, this invention proposes a dedicated assembly fixture. The upper positioning body corrects and centers the outer flange on the stainless steel pipe fitting during positioning, while the lower positioning body precisely positions and clamps the main stainless steel pipe. A weld ring correction assembly corrects the weld ring to form a circular ring. The weld ring has an open-loop structure and is fitted during the axial insertion of the copper branch pipe. After insertion, the weld ring is adhered to the end face of the flange structure. The capillary drainage of the engraved wires on the copper branch pipe ensures the uniformity of the weld slurry, thus guaranteeing the quality of the pipe fitting manufacturing. Attached Figure Description

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

[0059] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

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

[0061] Figure 4 for Figure 3 Diagram showing the position and structure of the sliding plate on the irregularly shaped branch pipe moving seat.

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

[0063] Figure 6 for Figure 5 A magnified view of a section at point B in the middle.

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

[0065] Figure 8 for Figure 7 A magnified view of a section at point C.

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

[0067] Figure 10 This is a diagram showing the positional relationship between the wire-cutting mold, the upper positioning block, and the lower positioning block in this invention.

[0068] Figure 11 for Figure 10 Internal structure diagram of the scribe mold.

[0069] Figure 12 for Figure 11 Side view of the scribe die.

[0070] Figure 13 for Figure 12 A magnified view of a section at point D.

[0071] Figure 14 for Figure 10 A magnified view of the area near the flared end of the filament.

[0072] Figure 15 This is a diagram showing the location distribution of the moving block, inner socket tube, alignment component, and fixed block.

[0073] Figure 16 for Figure 15 A magnified view of a section at point E in the middle.

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

[0075] Figure 18 for Figure 15 Location distribution diagram of the inner socket tube, drive wedge rod, and puller.

[0076] Figure 19 for Figure 15 A schematic diagram of the structure after the collimation hole and the puller are fitted together.

[0077] Figure 20 for Figure 15 Top view of the center section.

[0078] In the picture:

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

[0080] 200. Assembly platform; 2001. Guide table; 2002. Quick clamp II; 2003. Main pipe positioning groove; 2004. Outer flange positioning groove; 201. Lower positioning body; 202. Vertical plate; 2021. Quick clamp I; 203. Upper positioning body; 204. Irregular branch pipe moving seat; 2041. Irregular pipe positioning structure; 2042. Fixed seat; 2043. Slide plate; 205. Straight branch pipe moving seat; 2051. Straight branch pipe positioning structure; 210. Weld ring correction assembly; 211. Movable piece I; 212. Movable piece II; 213. Weld ring holding slot; 214. Sliding pin I; 215. Sliding groove I; 216. Sliding pin II; 217. Sliding groove II; 218. Elastic block;

[0081] 301. Upper positioning block; 302. Lower positioning block; 303. Cutting die; 3031. Cutting ring; 3032. Cutting body; 3033. Inward structure;

[0082] 401. Moving block; 402. Fixed block; 4021. Notch; 403. Inner socket tube; 404. Drive wedge rod; 405. Pulling head; 4051. Mating blind hole; 4052. Magnetic block; 406. Radial through hole; 407. Guide rod; 408. Ear plate; 409. Sleeve; 4010. Hole straightening component; 4011. Eccentric block; 4012. Rotating plate; 4013. Horizontal rod; 4014. Horizontal groove; 4015. Hook plate; 4016. Arc-shaped guide groove. Detailed Implementation

[0083] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0084] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0085] Example 1

[0086] like Figure 1 , Figure 2 As shown, a method for processing a refrigeration piping component comprising a steel main pipe and copper branch pipe structure is described below:

[0087] Step 1: Fabrication of Stainless Steel Pipe 101:

[0088] Select qualified stainless steel pipe fittings for cutting. After cutting, deburr both ends and pre-punch elliptical holes in the pipe fittings.

[0089] The pre-punched elliptical hole is flanged to obtain a flanged structure 1011 with the flanged end at the same height on the pipe fitting;

[0090] The inner diameter of the flange structure 1011 is adjusted, and the inner circle of the flange structure 1011 is shaped.

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

[0092] Step 2, Fabrication of copper branch pipe 102:

[0093] Select copper pipe fittings that meet the design requirements for cutting, reduce the end of the copper pipe fitting, bend the copper pipe fitting that needs to be bent, and finally engrave the other end of the copper pipe fitting to obtain a copper branch pipe with engraved end.

[0094] Step 3, Piping fitting fabrication:

[0095] A welding ring is fitted on the outside of the wire-cut end of the copper branch pipe 102. The wire-cut end of the copper branch pipe 102 is axially inserted into the inner circle of the flange structure 1011 and the welding ring is fitted to the end face of the flange structure 1011. The wire-cut end of the copper branch pipe 102 and the flange structure 1011 are in a tight fit state.

[0096] Install the copper head and the required welding ring within the copper head mounting 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 inside the tunnel furnace.

[0098] After cooling to room temperature, copper pipe 104 is welded to the area of ​​copper head mounting structure 103 by high-frequency local heating to obtain stainless steel pipe fittings.

[0099] By using a pre-punched elliptical hole that meets the required specifications, a flange structure 1011 is formed by drawing the elliptical hole outwards. This ensures that the end face of the final flange structure 1011 is flush, guaranteeing the uniform distribution of subsequent solder on the end face and ensuring assembly quality. Next, the end of the stainless steel main pipe 101 is flared, and a copper head is installed inside. High-frequency local heating is then applied to this area to complete the welding of the copper head and the copper branch pipe. This ensures that the hardness of the copper connecting pipe 104 is not affected during welding, guaranteeing the airtightness testing work at the OEM.

[0100] Example 2

[0101] In the manufacturing method, in step 3, as follows 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, and 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 vertical position of the upper positioning body 203 relative to the lower positioning body 201 is adjustable. 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 non-circular branch pipe moving seat 204 and a straight branch pipe moving seat 205. The non-circular branch pipe moving seat 204 and the straight branch pipe moving seat 205 slide relative to the assembly platform 200. The non-circular branch pipe moving seat 204 is provided with a non-circular 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 clamp 2021 is installed on the vertical plate 202. The quick clamp 2021 is used to drive the upper positioning body 203 to adjust its vertical position relative to the lower positioning body 201.

[0105] The assembly platform 200 is equipped with a guide table 2001 for the vertical stainless steel main pipe 101 and a quick clamp 2002. The irregular branch pipe moving seat 204 and the straight branch pipe moving seat 205 are slidably fitted on the guide table 2001. The quick clamp 2002 drives the irregular 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 outward flange positioning groove 2004. The outward flange positioning groove 2004 of the main pipe upper positioning structure is a U-shaped structure.

[0107] The quick clamp 2021 drives the upper positioning body 203 to move down, pressing and fixing the main pipe installed by the lower positioning structure of the main pipe. During the downward movement, the U-shaped structure of the outer flange positioning groove 2004 will guide and center the flange structure 1011, which is convenient for accurate positioning and fixing of the main pipe, and ensures the position of the upper flange structure 1011 of the main pipe.

[0108] Because one end of the stainless steel main pipe 101 has a bend (the end with the copper connecting pipe 104 welded on), under the action of gravity, the stainless steel main pipe 101 (especially the outward flange) on the lower positioning body 201 will not be in a horizontal state when it is rotated upward. The irregular branch pipe is installed on the irregular branch pipe moving seat 14, and the straight branch pipe is installed on the straight branch pipe moving seat 15. The irregular branch pipe moving seat 14 and the straight branch pipe moving seat 15 are moved along the corresponding guide table 101 by the quick clamp 102, so that the assembly operation of each branch pipe can be quickly realized, with high efficiency and high assembly accuracy.

[0109] By setting 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 and inserting structure (moving seat and guide table 2001) on the assembly platform 200, irregular-shaped branch pipes and straight branch pipes are axially inserted and assembled into the flanged 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 flanged structure 1011 is in a horizontal state. The corresponding branch pipes are moved into the flanged structure 1011 and inserted and fixed by the irregular-shaped branch pipe moving seat 204 and the straight branch pipe moving seat 205. The efficiency and accuracy are both high.

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

[0111] By providing a sliding plate 2043 on the irregular branch pipe moving seat 204, the irregular branch pipe is partially constrained by the sliding plate 2043, preventing vertical angular deviation during assembly and thus ensuring the assembly accuracy of the irregular branch pipe. The exposed dimensions of the irregular end of the irregular branch pipe are limited (generally around 15mm), and a horizontal positioning structure alone cannot effectively ensure the positional accuracy of the irregular branch pipe. Therefore, the above-mentioned structure is designed to circumvent this problem. The sliding plate 2043 effectively fixes the irregular branch pipe, ensuring stability during axial assembly and guaranteeing the assembly accuracy of the branch pipe.

[0112] The assembly platform 200 is equipped with a weld ring correction component 210. The weld ring correction component 210 is located on the side of the irregular branch pipe moving seat 204 and the straight branch pipe moving seat 205 near the stainless steel main pipe 101. The weld ring correction component 210 is used to correct the weld ring and is fitted onto the outside of the branch pipe.

[0113] The welding ring correction assembly 210 includes a first movable piece 211 and a second movable piece 212. The second movable piece 212 is located on the side of the first movable piece 211 away from the stainless steel main pipe 101, and a welding ring holding slot 213 is provided on the side of the second movable piece 212 opposite to the first movable piece 211. The top of the welding ring holding slot 213 is open. Two sets of the first movable piece 211 and the second movable piece 212 are symmetrically arranged.

[0114] The bottom of the movable piece 211 is provided with a sliding pin 214, and the assembly platform 200 is provided with a sliding groove 215 parallel to the stainless steel main pipe 101. The sliding pin 214 is slidably installed inside the sliding groove 215. The sliding groove 215 includes a slot 1 perpendicular to the stainless steel main pipe 101 and a slot 2 parallel to the stainless steel main pipe 101. One end of the slot 2 and one end of the slot 1 meet. The sliding pin 214 is connected to the assembly platform 200 by a spring.

[0115] The bottom of the movable piece 212 is provided with a sliding pin 216, and the assembly platform 200 is provided with a vertical stainless steel main pipe 101 with a sliding groove 217. The sliding pin 216 is slidably installed inside the sliding groove 217.

[0116] An elastic block 218 is provided on the side of the movable seat near the stainless steel main pipe 101. The elastic block 218 undergoes elastic deformation before the spring on the sliding pin 214 undergoes elastic deformation, thus completing the welding ring fitting on the outer wall of the branch pipe.

[0117] As the movable seat approaches the stainless steel main pipe 101, the movable plate 212 presses the weld ring inside the weld ring holding slot 213 onto the movable plate 211 to complete the rounding.

[0118] The welding ring is inserted from the top of the welding ring receiving slot 213. When the moving seat approaches the stainless steel main pipe 101, the moving seat will drive the movable plate 22 to approach the stainless steel main pipe 101. During the process of approaching the stainless steel main pipe 101, the welding ring will be rounded first. Since the original ring is an open ring structure, there is an axial deviation in the circumferential direction, so this step is necessary. Secondly, the movable plate 22 will squeeze the elastic block 28 under the obstruction of the movable plate 21, so that the movable plate 21 and the movable plate 22 will fit the rounded 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 is completed, movable pieces 21 and 22 will move together with the movable seat towards the stainless steel main pipe 101. During this process, the sliding pin 24 will be stretched by the spring installed on it. When it enters the end of the slot, it will be pulled, causing movable piece 21 to disengage from movable piece 22. As movable piece 22 disengages, the elastic block 28 will push the welding ring towards the stainless steel main pipe 101 and deliver it to fit against the end face of the assembly hole. The welding ring correction assembly 210 can assemble the welding ring at the opening position of the flange structure 1011 while assembling each branch pipe. This structure can first round the welding ring to prevent axial twisting when the welding ring is fitted on the outside of the branch pipe. Once twisting occurs, uneven welding liquid will occur during subsequent welding assembly, which will easily lead to substandard weld air tightness. Therefore, when assembling the branch pipe, the welding ring can be neatly fitted on the outside of the branch pipe and assembled simultaneously with the axial assembly of the branch pipe, resulting in better assembly efficiency and better assembly effect.

[0120] Example 3

[0121] In the manufacturing method described above, such as Figures 10 to 14 As shown, when wire is cut at the end of a copper pipe fitting that requires bending, the upper positioning block 301 and the lower positioning block 302 are used to clamp and fix the copper pipe fitting. The vertical position of the upper positioning block 301 relative to the lower positioning block 302 is adjustable. A cylinder is installed at the end of the upper positioning block 301 facing away from the lower positioning block 302. The cylinder is used to adjust the vertical position 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 each provided with an irregular positioning structure on their opposite sides. The upper positioning block 301 and the lower positioning block 302 are used to position the irregular pipe fittings through the irregular positioning structure.

[0123] The wire-cutting mold 303 adjusts 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, and shapes and cuts the exposed end.

[0124] The wire cutting mold 303 includes a wire cutting ring 3031 whose axial position relative to the pipe opening of the irregular pipe is adjustable. Wire cutting bodies 3032 are evenly distributed inside the wire cutting ring 3031. The wire cutting ring 3031 is provided with a flared mouth near the pipe opening for shaping the pipe opening. The wire cutting bodies 3032 are used to evenly cut wires on the surface of the shaped pipe opening.

[0125] The etched wire 3032 has an isosceles triangular structure, with the included angle between the two sides of the etched wire 3032 being 15-25°, and the thickness of the etched wire 3032 being 0.1-0.15mm.

[0126] The two sides of the scribe body 3032 near the scribe ring 3031 are both concave arc-shaped structures. The concave arc-shaped structure can release the scribe stress. The radius of the arc-shaped structure is 0.02-0.05mm. The scribe body 3032 is obtained by wire cutting.

[0127] The thickness of the wire cutter 3032 near the end of the irregular pipe fitting is less than the thickness away from the end of the irregular pipe fitting. By strictly limiting the thickness of the wire cutter 3032, it is easy to obtain a wire cut depth on the outer wall of the pipe opening that gradually decreases to zero away from the pipe opening, so that the welding liquid flows to the side closer to the stainless steel pipe fitting.

[0128] The end of the engraving ring 3031 away from the port of the irregular pipe fitting is provided with an inward structure 3033. The inward structure 3033 is used to form a certain slope or taper at the port of the irregular pipe fitting, so as to facilitate the axial assembly of the branch pipe within the flange structure 1011.

[0129] The inner structure 3033 is a ring structure located inside the wire-cutting ring 3031 at the end away from the port of the irregular pipe fitting. The width of the inner structure 3033 is 2-4mm. The size of the inner structure 3033 at the end near the port of the irregular pipe fitting is larger than the size of the end away from the port of the irregular pipe fitting. The included angle between the inner ring of the inner structure 3033 and the inner wall of the wire-cutting ring 3031 is 2-5°. The tapered end of the shaped pipe fitting, after being wired, is trimmed by the inward-facing structure 3033 to form a certain taper, which facilitates axial insertion and installation onto the stainless steel main pipe 101. The fitting is then welded in a tunnel furnace along with the stainless steel main pipe 101. It is important to note that before inserting the fitting onto the stainless steel main pipe 101, a welding ring with an open-loop structure of 0.1-1mm in diameter is first fitted onto the end of the shaped pipe fitting. After insertion, the welding ring will adhere to the outer wall of the stainless steel pipe fitting end. In the tunnel furnace, the welding ring melts along the wired structure and enters the tight fit between the end of the shaped pipe fitting and the end of the flanged structure 1011 to complete the assembly.

[0130] The upper positioning block 301 and lower positioning block 302 are used to press and fix the body of the irregular pipe fitting near the short end, restricting the irregular part of the pipe fitting and preventing angular and positional deviations during grooving. This ensures the position and exposed size of the irregular pipe fitting end. The flared end of the grooving ring 3031 is used to shape the irregular pipe fitting end. The reason is that this type of pipe fitting requires multiple bending and forming operations, but it needs to be assembled onto a stainless steel main pipe later. In order to ensure the welding quality of the weld joint, the pipe end of this type of pipe fitting has been previously grooved to achieve capillary drainage of the welding liquid. If the grooving step is placed before the bending and forming operation, due to the limited reserved length at the pipe end (about 15mm), the surface of the grooved end needs to be clamped during the bending and forming operation. This clamping damage to the grooved surface will affect the capillary drainage effect and may even cause pipe end deformation in severe cases. Therefore, the wire engraving operation needs to be performed after the pipe bending process. However, this method, due to the excessively tight distance between the end and the bending area, can cause pipe deformation during the bending process. While direct wire engraving can achieve this, the deformation at the pipe end makes it impossible to ensure precise wire engraving on the outer wall. This leads to uneven capillary flow of the welding flux later, potentially causing insufficient airtightness of the pipe fitting. Simultaneously, the wire engraving body 3032 inside the wire engraving ring 3031 axially engraves the outer wall of the pipe fitting. The end of the wire engraving ring 303 furthest from the irregularly shaped pipe fitting can be fitted with a cylinder or other actuator to adjust its axial position.

[0131] In practical use, the upper positioning block 301 is located on top of the lower positioning block 302. The irregular-shaped pipe is installed on the irregular-shaped positioning structure of the lower positioning block 3020, and the upper positioning block 301 moves down through the irregular-shaped positioning structure to press and fix the irregular-shaped pipe. The exposed length of the pipe opening of the irregular-shaped pipe is limited. The driver drives the wire cutting ring 303 to move axially close to the positioning structure to perform the first shaping and then wire cutting of the pipe opening of the irregular-shaped pipe in one step.

[0132] Example 4

[0133] In the manufacturing method described above, such as 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. The moving block 401 is slidably fitted onto the fixed block 402. The fixed block 402 is provided with a notch 4021, which corresponds to the flanging structure 1011. The fixed block 402 is provided with a recessed positioning structure. 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, allowing the moving block 401 to move closer to or away from the fixed block 402.

[0134] An inner socket tube 403 is inserted into a stainless steel pipe fitting. A drive wedge rod 404 is slidably fitted inside the inner socket tube 403. A radial through hole 406 is provided on the side wall of the inner socket tube 403. A puller 405 is slidably fitted inside the radial through hole 406. An oblique guide groove is provided on the side wall of the end of the drive wedge rod 404. A guide block is provided at the bottom of the puller 405. The guide block and the oblique guide groove are slidably fitted. The axial movement of the drive wedge rod 404 in the inner socket tube 403 causes the puller 405 to extend or retract in and out of the radial through hole 406. When the puller 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 fitted on the guide rod 407. The ear plate 408 is located on top of the spring. A sleeve 409 is fixed on the ear plate 408. A hole-calibrating component 4010 is rotatably installed inside the sleeve 409. The hole-calibrating component 4010 is located directly above the radial through hole 406 and on top of the notch groove 4021. The vertical position of the hole-calibrating component 4010 relative to the notch groove 4021 is adjustable. A forming part, a socket part, and a gradient part set between the forming part and the socket part are installed on the hole-calibrating component 4010. The flange structure 1011 is flanged using the hole-aligning part 4010 to ensure consistent axial dimensions, which facilitates the installation of branch pipes with socket fitting. At the same time, the inner circle of the flange structure 1011 is also shaped. When the flange is flanged by the puller 405, flanged flanging is required due to the draft angle. Also, due to the outward pulling of the pipe wall, uneven force may occur during the outward pulling process, which may lead to the inner circle of the flange structure being out of round.

[0136] The end of the puller head 405 is provided with a mating blind hole 4051, which is adapted to the socket portion. A hook groove is provided at the base of the mating blind hole 4051, and a magnetic block 4052 is installed within the groove. An eccentric block 4011 is provided on the outer side of the socket portion. The magnetic block 4052 is used to attract the eccentric block 4011, causing the eccentric block 4011 to be offset within the mating blind hole 4051 and form a hook structure with the hook groove. The mating blind hole 4051 allows the eccentric block 4011 to enter. The mating blind hole 4051 is eccentrically positioned at the top of the puller head 405. The magnetic block 4052 is located on one side of the hook groove, used to attract the eccentric block 4011 and cause it to deflect at a certain angle, thus forming a hook structure. This allows the hole alignment operation to be completed in one step when the puller head 405 is retracted, with high coaxiality.

[0137] The top of the hole-calibrating component 4010 is equipped with a rotating handle, which is operated to separate the magnetic block 4052 and the eccentric block 4011. When separation is required after hole calibration, the magnetic block 4052 and the eccentric block 4011 are separated by rotating the rotating handle.

[0138] The movable block 401 is provided with an arc-shaped groove, and a rotating plate 4012 is slidably fitted inside the arc-shaped groove. The top of the rotating plate 4012 is provided with a clearance groove. The clearance groove and the notch groove 4021 surround the flange outer forming area. A horizontal rod 4013 is installed on the top side of the rotating plate 4012.

[0139] The top of the fixed block 402 is provided with a horizontal groove 4014 for positioning the horizontal rod 4013 on the side facing the moving block 401. The horizontal rod 4013 is selectively adapted to the horizontal groove 4014.

[0140] A hook plate 4015 is rotatably mounted on the side of the fixing block 402. The hook plate 4015 is used to hook the horizontal rod 4013 and confine it within the horizontal groove 4014. An arc-shaped guide groove 4016 is provided on the rear side of the hook plate 4015, and a pin is installed in the arc-shaped guide groove 4016. The pin is installed on the side of the fixing block 402. In use, after clamping the pipe fitting, the horizontal rod 4013 is pulled upward and inserted into the horizontal groove 4014. The hook plate 4015 hooks and confines the horizontal rod 4013 within the horizontal groove 4014, thereby achieving the combination of the clearance groove and the notch groove 4021 to ensure the molding quality. After all operations are completed, the hook plate 4015 is pulled upward to separate from the horizontal rod 4013, and the rotating plate 4012 is rotated downward to reset and remove the pipe fitting.

[0141] When processing the outer flange of the elliptical hole, the outer forming area of ​​the flange is enclosed by the relief groove and the notch groove 4021 to pull the pipe wall of the flange part, so as to ensure that the pipe wall will not be deformed. In this way, the end face height can be accurately controlled and the thickness of the flange structure 1011 is relatively uniform.

[0142] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made to the technical solutions and inventive concepts of the present invention should all be covered within the scope of protection of the present invention.

Claims

1. A method for processing a refrigeration piping component comprising a steel main pipe and copper branch pipe structure, characterized in that, The production steps are as follows: Step 1, Fabrication of the stainless steel main pipe (101): Select qualified stainless steel pipe fittings for cutting. After cutting, deburr both ends and pre-punch elliptical holes in the pipe fittings. The pre-punched elliptical hole is flanged to obtain a flanged structure with the flanged end at the same height on the pipe fitting (1011). The inner diameter of the flange structure (1011) is adjusted, and the inner circle of the flange structure (1011) is shaped. One end of the pipe fitting is flared to obtain a copper head mounting structure (103). Step 2, Fabrication of copper branch pipe (102): Select copper pipe fittings that meet the design requirements for cutting, reduce the end of the copper pipe fitting, bend the copper pipe fitting that needs to be bent, and finally engrave the other end of the copper pipe fitting to obtain a copper branch pipe with engraved end. Step 3, Piping fitting fabrication: A welding ring is fitted on the outside of the wire-cut end of the copper branch pipe (102). The wire-cut end of the copper branch pipe (102) is axially inserted into the inner circle of the flange structure (1011) and the welding ring is fitted to the end face of the flange structure (1011). The wire-cut end of the copper branch pipe (102) and the flange structure (1011) are in a tight fit. Install the copper head and the required welding ring within the copper head mounting 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 inside the tunnel furnace. After cooling to room temperature, copper pipes (104) are welded to the area of ​​the copper head mounting structure (103) by high-frequency local heating to obtain stainless steel pipe fittings; 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), and 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 vertical position of the upper positioning body (203) relative to the lower positioning body (201) is adjustable. The upper positioning body (203) moves downward to cooperate with the lower positioning body (201) to fix the stainless steel main pipe (101). The assembly platform (200) is also equipped with a non-circular branch pipe moving seat (204) and a straight branch pipe moving seat (205). The non-circular branch pipe moving seat (204) and the straight branch pipe moving seat (205) are slidably engaged with the assembly platform (200). The non-circular branch pipe moving seat (204) is provided with a non-circular 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 irregular branch pipe moving seat (204). The fixed seat (2042) is vertically arranged and located on the side of the irregular branch pipe moving seat (204) away from the upper positioning body (203). A sliding groove for a vertical stainless steel main pipe (101) is provided on the irregular branch pipe moving seat (204). A sliding plate (2043) is slidably fitted in the sliding groove. A spring is installed between the sliding plate (2043) and the fixed seat (2042). The sliding plate (2043) is used to limit the top position of the irregular 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 clamp (2021) is installed on the vertical plate (202). The quick clamp (2021) is used to drive the upper positioning body (203) to adjust its vertical position relative to the lower positioning body (201). The assembly platform (200) is equipped with a guide table (2001) for the vertical stainless steel main pipe (101) and a quick clamping clamp (2002). The irregular branch pipe moving seat (204) and the straight branch pipe moving seat (205) are slidably fitted on the guide table (2001). The quick clamping clamp (2002) drives the irregular branch pipe moving seat (204) and the straight branch pipe moving seat (205) to move closer to or further away from the stainless steel main pipe (101).

2. The processing method of a refrigeration piping component comprising a steel main pipe and copper branch pipe structure according to claim 1, characterized in that, The lower positioning body (201) is provided with a main lower positioning structure, and the upper positioning body (203) is provided with a main upper positioning structure; Both the lower positioning structure and the upper positioning structure of the main pipe include a main pipe positioning groove (2003) and an outer flange positioning groove (2004). The outer flange positioning groove (2004) of the upper positioning structure of the main pipe is a U-shaped structure.

3. A method for processing a refrigeration piping component comprising a steel main pipe and copper branch pipe structure according to claim 1, characterized in that, The assembly platform (200) is provided with a weld ring correction component (210). The weld ring correction component (210) is located on the side of the irregular branch pipe moving seat (204) and the straight branch pipe moving seat (205) close to the stainless steel main pipe (101). The weld ring correction component (210) is used to correct the weld ring and fit it on the outside of the branch pipe.

4. A method for processing a refrigeration piping component comprising a steel main pipe and copper branch pipe structure according to claim 3, characterized in that, The welding ring correction assembly (210) includes a movable plate one (211) and a movable plate two (212). The movable plate two (212) is located on the side of the movable plate one (211) away from the stainless steel main pipe (101), and a welding ring holding slot (213) is provided on the side of the movable plate two (212) opposite to the movable plate one (211). The top of the welding ring holding slot (213) is open. Two sets of movable plates one (211) and movable plates two (212) are symmetrically arranged. The bottom of the movable piece 1 (211) is provided with a sliding pin 1 (214), and the assembly platform (200) is provided with a sliding groove 1 (215) provided by the parallel stainless steel pipe (101). The sliding pin 1 (214) is slidably installed inside the sliding groove 1 (215). The sliding groove 1 (215) includes a slot 1 provided by the vertical stainless steel pipe (101) and a slot 2 provided by the parallel stainless steel pipe (101). One end of the slot 2 and one end of the slot 1 meet. The sliding pin 1 (214) is connected to the assembly platform (200) by a spring. The bottom of the movable piece 2 (212) is provided with a sliding pin 2 (216), and the assembly platform (200) is provided with a sliding groove 2 (217) provided by the vertical stainless steel pipe (101). The sliding pin 2 (216) is slidably installed inside the sliding groove 2 (217). An elastic block (218) is provided on the side of the movable seat near the stainless steel main pipe (101). The elastic block (218) undergoes elastic deformation before the spring on the sliding pin (214) undergoes elastic deformation, thus completing the welding ring being fitted onto the outer wall of the branch pipe. As the moving seat approaches the stainless steel main pipe (101), the second movable piece (212) presses the weld ring inside the weld ring holding slot (213) against the first movable piece (211) to complete the rounding.

5. A method for processing a refrigeration piping component comprising a steel main pipe and copper branch pipe structure according to claim 4, characterized in that, When it is necessary to cut the end of the copper pipe fitting that is bent, the copper pipe fitting is pressed and fixed by the upper positioning block (301) and the lower positioning block (302). The vertical position height of the upper positioning block (301) relative to the lower positioning block (302) is adjustable. The upper positioning block (301) and the lower positioning block (302) are provided with irregular positioning structures on opposite sides, and the upper positioning block (301) and the lower positioning block (302) position the irregular pipe fittings through the irregular positioning structures; The axial position of the exposed end of the copper pipe fitting is adjusted by the wire cutting mold (303) and the upper positioning block (301) and lower positioning block (302) to press and fix it, and the exposed end is shaped and wire cut. The wire cutting mold (303) includes a wire cutting ring (3031) whose axial position relative to the pipe opening of the irregular pipe is adjustable. Wire cutting bodies (3032) are evenly distributed inside the wire cutting ring (3031). The wire cutting ring (3031) is provided with a flared mouth near the pipe opening for shaping the pipe opening of the irregular pipe. The wire cutting bodies (3032) are used to evenly cut wires on the surface of the pipe opening after shaping.

6. A method for processing a refrigeration piping component comprising a steel main pipe and copper branch pipe structure according to claim 5, characterized in that, The etched wire (3032) has an isosceles triangular structure, with the included angle between the two sides of the etched wire (3032) being 15-25°, and the thickness of the etched wire (3032) being 0.1-0.15mm; The two sides of the scribe body (3032) near the scribe ring (3031) are both concave arc-shaped structures with a radius of 0.02-0.05 mm. The scribe body (3032) is obtained by wire cutting. The thickness of the wire cutter (3032) near the end of the irregular pipe fitting is less than the thickness away from the end of the irregular pipe fitting. By strictly limiting the thickness of the wire cutter (3032), it is easy to obtain a wire cutter depth away from the pipe opening on the outer wall of the pipe opening, which gradually decreases to zero, so that the welding liquid flows to the side closer to the stainless steel pipe fitting. The end of the wire ring (3031) away from the port of the irregular pipe fitting is provided with an inward structure (3033), which is used to form a certain slope or taper at the port of the irregular pipe fitting. The inner structure (3033) is a ring structure set inside the wire ring (3031) at the end away from the port of the irregular pipe fitting. The width of the inner structure (3033) is 2-4mm. The size of the inner structure (3033) near the port of the irregular pipe fitting is larger than the size of the end away from the port of the irregular pipe fitting. The included angle between the inner ring of the inner structure (3033) and the inner wall of the wire ring (3031) is 2-5°.

7. A method for processing a refrigeration piping component comprising a steel main pipe and copper branch pipe structure according to claim 5, 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 fitted on the fixed block (402). The fixed block (402) is provided with a notch (4021) and a recessed positioning structure. The stainless steel pipe fitting is radially positioned by the limiting structure and the positioning structure. An inner socket tube (403) is inserted into a stainless steel pipe fitting. A drive wedge rod (404) is slidably fitted inside the inner socket tube (403). A radial through hole (406) is provided on the side wall of the inner socket tube (403). A puller (405) is slidably fitted inside the radial through hole (406). An oblique guide groove is provided on the side wall of the end of the drive wedge rod (404). A guide block is provided at the bottom of the puller (405). The guide block and the oblique guide groove are slidably fitted. The movement of the drive wedge rod (404) inside the inner socket tube (403) causes the puller (405) to extend or retract inside and outside the radial through hole (406), and the elliptical hole is pulled out and turned outward. A guide rod (407) is installed on a fixed block (402). A spring and an ear plate (408) are fitted on the guide rod (407). The ear plate (408) is located on top of the spring. A sleeve (409) is fixed on the ear plate (408). A hole-calibrating component (4010) is rotatably installed inside the sleeve (409). The hole-calibrating component (4010) is located directly above the radial through hole (406). The hole-calibrating component (4010) is located on top of the notch groove (4021). The vertical position of the hole-calibrating component (4010) relative to the notch groove (4021) is adjustable. A forming part, a socket part, and a gradient part set between the forming part and the socket part are installed on the hole-calibrating component (4010). The end of the puller (405) is provided with a mating blind hole (4051), which is adapted to the socket. A hook groove is provided at the root of the 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. The magnetic block (4052) is used to attract the eccentric block (4011) so that the eccentric block (4011) is biased in the blind hole (4051) to form a hook structure. The top of the hole-aligning component (4010) is provided with a rotating handle, which can be operated to separate the magnetic block (4052) and the eccentric block (4011).

8. A method for processing a refrigeration piping component comprising a steel main pipe and copper branch pipe structure according to claim 7, characterized in that, The movable block (401) is provided with an arc-shaped groove, and a rotating plate (4012) is slidably fitted inside the arc-shaped groove. A clearance groove is provided on the top of the rotating plate (4012). The clearance groove and the notch groove (4021) surround the flange outer forming area. A horizontal rod (4013) is installed on the top side of the rotating plate (4012). The fixed block (402) has a horizontal groove (4014) on the side of the top facing the moving block (401) for positioning the horizontal rod (4013), and the horizontal rod (4013) is selectively adapted to the horizontal groove (4014).

9. A method for processing a refrigeration piping component comprising a steel main pipe and copper branch pipe structure according to claim 8, characterized in that, A hook plate (4015) is rotatably mounted on the side of the fixed block (402). The hook plate (4015) is used to hook the horizontal bar (4013) and confine it in the horizontal groove (4014). An arc-shaped guide groove (4016) is provided on the rear side of the hook plate (4015). A pin is installed in the arc-shaped guide groove (4016). The pin is installed on the side of the fixed block (402).

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