A method for processing a sanitary ring pipe

Abstract

This invention discloses a processing method for sanitary ring pipes, relating to the field of fluid sanitary pipeline manufacturing technology. The invention uses stainless steel pipes as the blank for the sanitary ring pipe; performs online bright solution treatment on the stainless steel pipes; then uses a pipe bender to bend two stainless steel pipes into two semi-ring pipes; removes excess material from the ends of the semi-ring pipes; performs rough polishing on the inner surface of the semi-ring pipes using a handheld polishing machine; mills the two end faces of the semi-ring pipes flat using a CNC boring and milling machine; performs local spot welding on the weld seams at the joints of the complete ring pipe; then performs stress-relieving bright annealing on the complete ring pipe; finally, uses a CNC floor-mounted boring machine to enlarge and bore the mounting holes and outlet holes of the first, second, third, and fourth connecting pipes on the complete ring pipe, and countersinks the stop surfaces of the mounting holes. This invention, by optimizing the processing technology of the sanitary ring pipe, effectively improves the processing quality of the sanitary ring pipe.

Description

Technical Field

[0001] This invention belongs to the field of fluid sanitary pipeline processing and manufacturing technology, and relates to a processing method for a sanitary ring pipe, specifically a processing method for a sanitary ring pipe for a beverage filling machine. Background Technology

[0002] The ring tube, used as a filling container for fruit juice and dairy beverages in filling machines, is a key component. Because sugary drinks are highly susceptible to bacterial growth, if there are unsanitary areas within the ring tube's inner cavity during manufacturing, the CIP (Clean-In-Place) cleaning process of the filling machine may not guarantee thorough cleaning of the tube's interior, leading to bacterial growth. Therefore, the ring tube, which comes into direct contact with the beverage, has extremely high hygiene requirements. This large-size ring tube is a relatively complex welded structure. Existing ring tube technologies typically employ... 121×6 stainless steel seamless pipes (316L) are rolled into shape. Traditional processes for this thickness involve rolling industrial-grade steel pipes and then polishing the surface to achieve sanitary standards. However, industrial-grade steel pipes, whether cold-drawn or hot-rolled, have relatively rough walls, potentially leading to defects such as folds, delamination, and scale buildup. Furthermore, during the rolling process of ring pipes, thicker wall rings are prone to folds and wrinkles, which cannot be completely eliminated by subsequent polishing. Additionally, ring pipes are susceptible to deformation during forming, welding, machining, and heat treatment, affecting subsequent assembly and equipment stability. Therefore, a processing method for sanitary ring pipes is urgently needed to address these issues. Summary of the Invention

[0003] The present invention provides a method for processing a sanitary ring pipe, the purpose of which is to solve the technical problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0005] This invention relates to a method for processing a sanitary annular pipe, the sanitary annular pipe comprising a complete annular pipe; a first connecting pipe, a second connecting pipe, a third connecting pipe, and a fourth connecting pipe are welded to the outer surface of the complete annular pipe; a plurality of liquid outlet holes are evenly distributed along the axial direction on the outer surface of the complete annular pipe; studs are provided on both sides of the liquid outlet holes along the axial direction of the complete annular pipe; one end of each stud is welded to the outer surface of the complete annular pipe; four overlapping plates are horizontally welded to the outer surface of the complete annular pipe; the four overlapping plates are evenly distributed on the inner side of the complete annular pipe.

[0006] The processing method is characterized by comprising the following steps:

[0007] Step 1: Select two 121mm×4mm stainless steel pipe is used as the blank for sanitary ring pipe, and the length of the welded pipe is 2300mm~2400mm;

[0008] Step 2: First, perform online bright solution treatment on the stainless steel pipe, then use a pipe bender to... The 1400 ring pipe is made by bending two stainless steel pipes into two semi-ring pipes respectively;

[0009] Step 3: Place the semi-circular tube horizontally on the workbench and draw the inner and outer contour lines of the semi-circular tube in orthographic projection on the workbench. Then draw the cutting lines for the excess material at both ends of the semi-circular tube. After leaving a 3mm to 5mm allowance at each end of the semi-circular tube, cut off the excess material at the end of the semi-circular tube.

[0010] Step 4: Lift the semi-circular tube and point one end of the semi-circular tube toward the light source. Then, use a handheld polisher to rough polish the inner surface of the semi-circular tube.

[0011] Step 5: Use a CNC boring and milling machine to mill the two ends of the semi-ring tube flat, so that the two ends of the semi-ring tube are on the same plane and the outline of the semi-ring tube is a 180° circle. Then, make a 3mm×30° welding bevel on the outer edge of the port of the semi-ring tube.

[0012] Step Six: Draw a crosshair on the surface of half of the ring pipe. The position of this crosshair is the installation position of the first connecting pipe. Then, pre-drill a hole at the position of the crosshair. 6mm single-sided hole; then combine the two half-ring tubes into a complete ring tube on the workbench, and leave a gap of 1mm to 2mm at the joint of the complete ring tube;

[0013] Step 7: Under the protection of argon gas, perform local spot welding on the weld seam at the splice of the ring pipe, then perform stress-relieving bright annealing on the ring pipe, and then use a CNC floor-mounted boring machine to enlarge the mounting holes and liquid outlet holes of the first, second, third and fourth connecting pipes on the ring pipe, and countersink the stop surface of the mounting holes.

[0014] Step 8: Using the pipe positioning fixture, combine the first pipe, second pipe, third pipe and fourth pipe with the complete ring pipe respectively. Then, under the protection of argon gas, use the single-sided welding double-sided forming technology to weld the first pipe, second pipe, third pipe and fourth pipe onto the complete ring pipe in sequence.

[0015] Step 9: First, use the stud positioning tool to weld the studs to the surface of the ring tube on both sides of the liquid outlet. Then, draw the combination position lines of the four mounting plates on the inside of the ring tube. Finally, weld the four mounting plates horizontally to the outer surface of the ring tube.

[0016] Step 10: First, relieve the welding stress of the whole ring pipe, then draw a cross matching combination line at the connection of the two half ring pipes, and then use an angle grinder to grind away the weld points of the whole ring pipe to separate the two half ring pipes.

[0017] Step 11: First, repeat step 4 to perform a second fine polishing on the semi-ring tube. Then, polish the outer surface and end face of the semi-ring tube. Finally, use an endoscope to inspect and take X-rays of the semi-ring tube.

[0018] Step 12: Combine the two half-ring tubes into a complete ring tube again, and check the cross-shaped matching line. Leave a gap of 1mm to 2mm at the splice of the complete ring tube. Then, under the protection of argon gas, weld the splice of the complete ring tube using the single-sided welding double-sided forming technology.

[0019] Step 13: First, use a CNC gantry milling machine to mill and clean the mounting holes and stops of the mounting plate. Then, perform X-ray inspection on the weld of the entire ring pipe. Next, use pipe plug tool to seal the first, second, third, and fourth connecting pipes, and use hole plug tool to seal the liquid outlet. Perform a water leakage test on the sanitary ring pipe with a water pressure of not less than 0.8 MPa.

[0020] Step 14: First, perform acid pickling and passivation treatment on the inner cavity of the sanitary loop pipe. Then, rinse and clean the inner cavity of the sanitary loop pipe. Finally, perform a quality inspection on the sanitary loop pipe.

[0021] As a preferred embodiment of the present invention, in step four, the handheld polishing machine includes a servo motor and a handle fixed to the tail end of the servo motor; the output shaft of the servo motor is coaxially connected to one end of a first transmission shaft; the other end of the first transmission shaft is connected to one end of a second transmission shaft via a universal joint; a polishing wheel is coaxially fixed to the other end of the second transmission shaft.

[0022] In a preferred embodiment of the present invention, in step eight, the pipe positioning fixture includes a U-shaped positioning bracket; both ends of the positioning bracket have arc-shaped edges; the two ends of the positioning bracket can be fitted to the outer circumference of the ring pipe; the two arms of the positioning bracket are connected by a support strip; a positioning rod is slidably inserted on the support strip; one end of the positioning rod slidably passes through the middle arm of the positioning bracket; and an extension column is coaxially fixed to the other end of the positioning rod.

[0023] As a preferred embodiment of the present invention, in step nine, the stud positioning fixture includes a support plate; a pair of positioning pins are fixed on one surface of the support plate along the annular direction; an insertion pin is coaxially fixed at one end of each positioning pin; a pair of mating holes are formed on one surface of the support plate along the annular direction; the two pairs of mating holes are respectively located on both sides of the two positioning pins.

[0024] As a preferred embodiment of the present invention, in step thirteen, the pipe plug tool includes a U-shaped block and a first sealing post disposed inside the U-shaped block; both ends of the U-shaped block have hooks; the middle arm of the U-shaped block is threaded with a locking stud perpendicular to it; one end of the locking stud abuts against one end face of the first sealing post.

[0025] As a preferred technical solution of the present invention, in step thirteen, the hole plugging fixture includes a mounting plate and a second sealing post vertically fixed to one surface of the mounting plate; a pair of receiving holes corresponding to the studs are opened on one surface of the mounting plate in a circumferential direction; the studs are inserted into the receiving holes; and a locking nut can be threaded onto the studs.

[0026] The present invention has the following beneficial effects:

[0027] This invention optimizes the selection of raw materials for the annular pipe, the arrangement of processing procedures and steps, the rational selection of processing equipment, and the design of specific specifications for a series of processing methods, including welding positioning fixtures to assist in processing, forming, welding, machining, heat treatment, and surface treatment. Combined with a series of inspection methods such as endoscopy, weld X-ray flaw detection, and pressure testing for leak detection, this invention ensures the processing quality of sanitary annular pipe welds and better meets the product's usage requirements.

[0028] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the sanitary ring tube of the present invention.

[0031] Figure 2 This is a schematic diagram illustrating the use of the handheld polishing machine of the present invention.

[0032] Figure 3 This is a schematic diagram of the structure of the semi-circular tube after the end face has been milled flat according to the present invention.

[0033] Figure 4 This is a schematic diagram of the structure of the mounting hole after the stop surface of the present invention has been countersunk.

[0034] Figure 5 This is a schematic diagram illustrating the use of the nozzle positioning tool of the present invention.

[0035] Figure 6 This is a schematic diagram illustrating the use of the stud positioning fixture of the present invention.

[0036] Figure 7 for Figure 6 Top view of the structure.

[0037] Figure 8 This is a schematic diagram of the two halves of the ring pipe after welding according to the present invention.

[0038] Figure 9 This is a schematic diagram illustrating the use of the pipe plug tool of the present invention.

[0039] Figure 10 This is a schematic diagram illustrating the use of the hole plug tool of the present invention.

[0040] Figure 11 This is a schematic diagram of the structure of the first connecting pipe of the present invention. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Specific Implementation Example 1:

[0043] Please see Figure 1-10 As shown, this invention relates to a method for processing a sanitary ring pipe, the structure of which is as follows: Figure 1 As shown, it includes a complete ring pipe 1; the outer surface of the complete ring pipe 1 is welded with a first connecting pipe 2, a second connecting pipe 3, a third connecting pipe 4, and a fourth connecting pipe 5; the first connecting pipe 2, the second connecting pipe 3, the third connecting pipe 4, and the fourth connecting pipe 5 have the same structure; multiple liquid outlet holes 6 are evenly distributed along the axial direction on the outer surface of the complete ring pipe 1; studs 7 are provided on both sides of the liquid outlet holes 6 along the axial direction of the complete ring pipe 1; one end of the stud 7 is welded to the outer surface of the complete ring pipe 1; four mounting plates are horizontally welded to the outer surface of the complete ring pipe 1; the four mounting plates are evenly distributed on the inner side of the complete ring pipe 1; the processing method includes the following steps:

[0044] Step 1: Since this ring-shaped container is a low-pressure sanitary pipe, the industry generally prefers standard-specification sanitary pipes (welded pipes) for rolling and forming. Because the sanitary round pipe base material for rolling the ring-shaped pipe can achieve a very high surface roughness (Ra0.1~Ra0.4) before welding, coupled with a reduced wall thickness (national standard sanitary pipe wall thickness), after rolling and forming, many inherent material defects are avoided compared to industrial round pipes. Therefore, two... A 121mm × 4mm stainless steel pipe is used as the blank for the sanitary ring pipe, and the rolling diameter of the sanitary ring pipe is... 1400, so it is more appropriate to splice and weld two 180° semi-circular pipes together. Therefore, the length of the welded pipe is 2300mm~2400mm, that is, the material is cut according to the unfolded length of the sanitary ring pipe of 2199mm + 200mm (pressure head allowance).

[0045] Step two: First, perform online bright solution treatment on the stainless steel pipe. This reduces material stress and improves material toughness, facilitating subsequent processing and forming. Then, use a conventional pipe bender in this field according to... The 1400 ring pipe is made by bending two stainless steel pipes into two semi-ring pipes respectively;

[0046] Step 3: Place the semi-circular tube horizontally on the workbench and draw the inner and outer contour lines of the semi-circular tube in orthographic projection on the workbench. Then draw the material cutting lines at both ends of the semi-circular tube. The two material cutting lines are on the 180° semicircle line of the inner and outer contour lines of the semi-circular tube. After leaving a 3mm to 5mm allowance at each end of the semi-circular tube, cut off the material at the end of the semi-circular tube.

[0047] Step 4: Lift the semi-circular tube and point one end towards the light source. The bright reflection created by the light shining on the inner wall of the semi-circular tube allows for clear observation of the polishing condition of the inner surface. Then, use a handheld polishing machine to perform rough polishing on the inner surface of the semi-circular tube (e.g., ...). Figure 2 (as shown)

[0048] Step 5: Using a conventional CNC boring and milling machine in this field, mill the two ends of the semi-ring tube flat, so that the two ends of the semi-ring tube are on the same plane and the outline of the semi-ring tube is a 180° circle. Then, chamfer a 3mm × 30° welding bevel on the outer edge of the port of the semi-ring tube (e.g., Figure 3 (as shown)

[0049] Step Six: Draw a crosshair on the surface of half of the ring pipe. The position of this crosshair is the installation position of the first connecting pipe 2. Then, pre-drill a hole at the position of the crosshair. A 6mm single-hole is used as a welding ventilation hole; then, two half-ring pipes are combined into a complete ring pipe 1 on the worktable, and a gap of 1mm to 2mm is left at the splice of the complete ring pipe 1 to facilitate full penetration of the weld.

[0050] Step 7: Under argon gas protection, perform local spot welding on the weld seam at the splice of the ring pipe 1, and then perform stress-relieving bright annealing on the ring pipe 1 to eliminate residual stress, stabilize dimensions, and reduce deformation. Then, using a conventional CNC floor-type boring machine, enlarge the mounting holes of the first connecting pipe 2, the second connecting pipe 3, the third connecting pipe 4, and the fourth connecting pipe 5 on the ring pipe 1, as well as the liquid outlet hole 6. Each mounting hole should be countersunk to the nominal diameter of the connecting pipe + 0.10 / 0 tolerance to facilitate positioning and welding (e.g., ...). Figure 4 (as shown)

[0051] Step 8: Using the connector positioning fixture, assemble the first connector 2, the second connector 3, the third connector 4, and the fourth connector 5 with the complete ring pipe 1 respectively. Then, under argon gas protection, use single-sided welding and double-sided forming technology to sequentially weld the first connector 2, the second connector 3, the third connector 4, and the fourth connector 5 onto the complete ring pipe 1 (e.g., ...). Figure 5 (as shown)

[0052] Step 9: First, using the stud positioning tool, weld the studs 7 sequentially onto the surface of the ring tube 1 on both sides of the outlet hole 6. Then, draw the assembly position lines of the four mounting plates on the inner side of the ring tube 1 (the lower surfaces of the four mounting plates are on the same plane, with a flatness of ±0.5). Next, weld the four mounting plates horizontally onto the outer surface of the ring tube 1 sequentially (e.g., ...). Figure 6-7 (as shown)

[0053] Step 10: First, remove the welding stress from the entire ring tube 1. The welding stress removal methods are natural aging (it is recommended to place it in a natural state for two days) and vibration (it is recommended to vibrate for 20 to 30 minutes). Then, draw a cross pairing combination line at the connection of the two half ring tubes to facilitate the later assembly and correction. Then, use a conventional angle grinder in this field to grind away the weld points of the entire ring tube 1 at the spot weld of the two half ring tubes to separate the two half ring tubes.

[0054] Step 11: First, repeat step 4 to perform a second fine polishing on the semi-ring tube. Polish the inner wall of the ring tube to meet the requirement of Ra≤0.4um. Then polish the outer surface (including the weld and the weld-affected zone) and end face of the semi-ring tube. Finally, use a conventional endoscope in this field to inspect and photograph the semi-ring tube.

[0055] Step 12: On the workbench, reassemble the two semi-ring tubes into a complete ring tube 1, and align the cross-shaped assembly lines. Leave a 1mm to 2mm gap at the joint of the complete ring tube 1 to ensure full penetration of the weld. Then, under argon gas protection, weld the joint of the complete ring tube 1 using a single-sided welding and double-sided forming technique (e.g., Figure 8 (as shown)

[0056] Step 13: First, use a CNC gantry milling machine to mill and clean the mounting holes and stops of the mounting plate, ensuring that the mounting holes and stops are coplanar. Then, perform X-ray inspection on the welds of the entire ring pipe 1. Next, use pipe plugs to seal the first connecting pipe 2, the second connecting pipe 3, the third connecting pipe 4, and the fourth connecting pipe 5, and use hole plugs to seal the outlet hole 6. Under pressure holding conditions of not less than 2 hours, conduct a leakage test on the sanitary ring pipe with a water pressure of not less than 0.8 MPa (e.g., Figure 9-10 (as shown)

[0057] Step 14: First, perform acid pickling and passivation treatment on the inner cavity of the sanitary loop pipe. Then, rinse and clean the inner cavity of the sanitary loop pipe. Finally, perform a quality inspection on the sanitary loop pipe.

[0058] All the above pipe processing, fabrication and inspection shall comply with the relevant provisions of the standard GB / T 14976-2012 Seamless Stainless Steel Pipes for Fluid Transportation.

[0059] Among them, such as Figure 11 As shown, the first connector 2, the second connector 3, the third connector 4, and the fourth connector 5 have the same structure. The manufacturing process of the first connector 2, the second connector 3, the third connector 4, and the fourth connector 5 is as follows: Select straight sanitary pipe 30 blank → Cut each sanitary straight pipe 30 according to the drawing dimensions using a pipe cutting machine → Purchase standard threaded connectors 31 → Use single-sided welding double-sided forming welding technology (gas shielded welding) to weld the threaded connectors 31 and sanitary straight pipes 30 together → Wait for final welding with the complete ring pipe 1.

[0060] The manufacturing process of stud 7 is as follows: the material blank is selected as round steel → the material is cut by a saw → the total length of both sides is machined by CNC turning according to the dimensions in the drawing → one end is chamfered 2×45° → the other end is fitted with M6-6g thread to meet the length requirements → wait for final welding with the whole ring tube 1.

[0061] The manufacturing process of the cladding plate is as follows: Select stainless steel plate blank (no machining allowance is left for plate thickness due to the design of installation holes and stops) → CNC plasma cutting with machining allowance around the perimeter → Plane the length and width to the six sides according to the drawing dimensions → Polish the plate surface → Wait for final welding with the ring pipe 1. Specific Implementation Example 2:

[0063] Based on specific embodiment one, as follows Figure 2As shown, the handheld polisher includes a conventional servo motor 10 and a handle 11 fixed to the tail end of the servo motor 10 housing. The handle 11 has a conventional structure. The output shaft of the servo motor 10 is coaxially connected to one end of a first drive shaft 12 via a conventional coupling. The other end of the first drive shaft 12 is connected to one end of a second drive shaft 14 via a conventional universal joint 13. A conventional polishing wheel 15 is coaxially fixed to the other end of the second drive shaft 14. The polishing wheel 15 consists of a cylindrical wheel body and a scouring pad fixedly wrapped around the outer circumference of the cylindrical wheel body. In use, the polishing wheel 15 is inserted into the interior of the semi-annular tube, with the circumference of the polishing wheel 15 abutting against the inner wall of the semi-annular tube. Then, the servo motor 10 is started, causing the servo motor 10 to drive the polishing wheel 15 to rotate via the first drive shaft 12, universal joint 13, and second drive shaft 14. Then, the servo motor 10 is pulled back and forth by operating the handle 11, causing the polishing wheel 15 to move inside the semi-annular tube, thereby achieving the polishing treatment of the semi-annular tube. Specific Implementation Example 3:

[0065] Based on the second specific embodiment, as follows Figure 5 As shown, the pipe positioning fixture includes a U-shaped positioning bracket 16; both ends of the positioning bracket 16 have arc-shaped edges; the two ends of the positioning bracket 16 can fit into the outer circumference of the ring pipe 1; the two arms of the positioning bracket 16 are connected by a support strip 17; the two ends of the support strip 17 are respectively welded to the two arms of the positioning bracket 16; a positioning rod 18 is slidably inserted on the support strip 17; one end of the positioning rod 18 slides through the middle arm of the positioning bracket 16; the other end of the positioning rod 18 is coaxially fixed with an extension column 19; the diameter of the extension column 19 is smaller than the diameter of the positioning rod 18. In use, the two ends of the positioning bracket 16 are fitted to the outer circumference of the shaped tube 1. Both arms of the positioning bracket 16 are set radially along the shaped tube 1. Then, one end face of the first connector 2 (or the second connector 3, the third connector 4, or the fourth connector 5) abuts against the stop face 9 of the mounting hole. Then, the extension post 19 is slidably inserted into the first connector 2, so that the other end face of the positioning rod 18 abuts against the other end face of the first connector 2. Then, the positioning rod 18 is manually pressed to make the first connector 2 stably set on the shaped tube 1. At this time, the central axis of the first connector 2 coincides with the central axis of the mounting hole. Then, the first connector 2 (or the second connector 3, the third connector 4, or the fourth connector 5) is welded using welding technology. This not only effectively improves the welding efficiency and welding accuracy of the first connector 2 (or the second connector 3, the third connector 4, or the fourth connector 5), but also ensures that the form and position tolerances (angle, perpendicularity, position) of each connector meet the requirements. Specific Implementation Example 4:

[0067] Based on the third specific embodiment, as follows Figure 6-7As shown, the stud positioning fixture includes a support plate 20; a pair of positioning pins 21 are welded to one surface of the support plate 20 along the annular direction; an insert pin 22 is coaxially welded to one end of the positioning pin 21; the diameter of the insert pin 22 is smaller than the diameter of the positioning pin 21; a pair of mating holes 23 are opened on one surface of the support plate 20 along the annular direction; the two pairs of mating holes 23 are respectively set on both sides of the two positioning pins 21; the mating holes 23 are blind holes; the mating holes 23 can slide with the stud 7. In use, the two insert pins 22 are slidably inserted into the two adjacent liquid outlet holes 6 respectively, and one end of the stud 7 is slidably inserted into the mating hole 23. Then, one end of the stud 7 abuts against the circumferential side wall of the shaping tube 1, and then one end of the positioning pin 21 abuts against the circumferential side wall of the shaping tube 1. Thus, the stud 7 can be stably set on the circumference of the shaping tube 1. Then, the stud 7 is welded to the shaping tube 1 using welding technology, so that the form and position tolerances (angle, perpendicularity, position) of the stud 7 meet the requirements. Specific Implementation Example 5:

[0069] Based on specific embodiment four, as follows Figure 9 As shown, the pipe plugging fixture includes a U-shaped block 24 and a first sealing post 25 disposed inside the U-shaped block 24; both ends of the U-shaped block 24 have hooks; the middle arm of the U-shaped block 24 is threaded with a perpendicular locking stud 26; one end of the locking stud 26 abuts against one end face of the first sealing post 25; the other end of the first sealing post 25 has a tapered structure; the first sealing post 25 is a nylon rod. In use, the other end of the first sealing post 25 is inserted into the first connecting pipe 2, and the two hooks of the U-shaped block 24 are hooked onto the joint step surface of the first connecting pipe 2. Then, by rotating the locking stud 26, one end of the locking stud 26 abuts against one end face of the first sealing post 25, and by continuously rotating the locking stud 26, the first sealing post 25 is stably inserted into the first connecting pipe 2, thereby achieving a seal on the first connecting pipe 2. The same operation method is used to plug the second connecting pipe 3, the third connecting pipe 4, and the fourth connecting pipe 5.

[0070] like Figure 10 As shown, the hole plugging fixture includes a mounting plate 27 and a second sealing post 28 vertically fixed to one surface of the mounting plate 27; one end of the second sealing post 28 has a tapered structure; a pair of receiving holes corresponding to studs 7 are opened along the annular direction on one surface of the mounting plate 27; the studs 7 are inserted into the receiving holes; a locking nut 29 can be threaded onto the studs 7. In use, one end of the second sealing post 28 is inserted into the liquid outlet hole 6, and then the studs 7 on both sides of the liquid outlet hole 6 are respectively inserted into the two receiving holes on the mounting plate 27. Then, the locking nut 29 is threaded onto the studs 7, and the second sealing post 28 seals the liquid outlet hole by adjusting the position of the locking nut 29 on the studs 7.

[0071] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A sanitary annular pipe processing method, the sanitary annular pipe comprising a whole annular pipe (1); a first connecting pipe (2), a second connecting pipe (3), a third connecting pipe (4) and a fourth connecting pipe (5) welded on the outer surface of the whole annular pipe (1); a plurality of liquid outlet holes (6) evenly distributed on the outer surface of the whole annular pipe (1) along the axial direction; studs (7) arranged on both sides of the liquid outlet hole (6) along the axial direction of the whole annular pipe (1); one end of the stud (7) welded on the outer surface of the whole annular pipe (1); four clamping plates horizontally welded on the outer surface of the whole annular pipe (1); the four clamping plates evenly distributed on the inner side of the whole annular pipe (1); characterized in that The processing method comprises the following steps: Step one, select two 121 mm x 4 mm stainless steel pipe as sanitary ring pipe blank, and the length of the welded pipe is 2300 mm to 2400 mm; Step two, first on-line bright solution treatment of stainless steel pipe, then using pipe bender according to 1400 ring pipe size of two stainless steel pipe will be bent into two half ring pipe; Step three, horizontally place the half annular pipe on the workbench, draw the inner and outer contour lines of the half annular pipe in the orthographic projection state on the workbench, then draw the excess material cutting line of the two ends of the half annular pipe, and then cut off the excess material of the end of the half annular pipe after leaving 3mm-5mm excess material; Step four, hoist the half annular pipe, and then direct the port of the half annular pipe towards the light source, and then use the handheld polisher to perform rough polishing on the inner cavity surface of the half annular pipe; Step five, use the numerical control boring and milling machine to mill the two end faces of the half annular pipe flat, so that the two end faces of the half annular pipe are in the same plane and the profile of the half annular pipe is 180° circle, and a 3mm×30° welding bevel is formed on the outer edge of the port of the half annular pipe; Step six, draw a cross center bisector on the surface of one half ring, the position of the cross center bisector is the installation position of the first connecting pipe (2), then pre-drill a 6mm single-sided hole at the position of the cross center bisector 6mm single-sided hole; then combine the two half rings into a whole ring (1) on the workbench, and leave a gap of 1mm-2mm at the joint of the whole ring (1); Step seven, under the condition of argon gas filling protection, locally spot weld the weld joint of the whole annular pipe (1), then perform stress relief bright annealing treatment on the whole annular pipe (1), then use the numerical control floor boring and drilling machine to expand the installation holes of the first connecting pipe (2), the second connecting pipe (3), the third connecting pipe (4) and the fourth connecting pipe (5) on the whole annular pipe (1) and the liquid outlet hole (6), and then flatten the stop face (9) of the installation hole; Step eight, use the connecting pipe positioning tool to combine the first connecting pipe (2), the second connecting pipe (3), the third connecting pipe (4) and the fourth connecting pipe (5) with the whole annular pipe (1) respectively, then use the single-sided welding double-sided forming technology to sequentially weld the first connecting pipe (2), the second connecting pipe (3), the third connecting pipe (4) and the fourth connecting pipe (5) on the whole annular pipe (1) under the condition of argon gas filling protection; Step nine, use the stud positioning tool to sequentially weld the studs (7) on the surface of the whole annular pipe (1) on both sides of the liquid outlet hole (6), then draw the combined position line of the four clamping plates on the inner side of the whole annular pipe (1), and then sequentially horizontally weld the four clamping plates on the outer surface of the whole annular pipe (1); Step ten, first remove the welding stress of the whole annular pipe (1), then draw the cross matching combination line at the connection of the two half annular pipes, then use the angle grinder to grind off the welding points of the whole annular pipe (1) to separate the two half annular pipes; Step eleven, first repeat step four to perform secondary fine polishing on the half annular pipe, then polish the outer surface and end face of the half annular pipe, and then use the endoscope to detect and take pictures of the half annular pipe. Step twelve, the two half ring pipe is combined into whole ring pipe (1) again, and the cross pair combination line is checked, the joint of whole ring pipe (1) is left 1mm-2mm gap, then the joint of whole ring pipe (1) is welded by using single side welding double side forming technology under the condition of argon gas filling protection; Step thirteen, first, the mounting hole and the stopper of the batten are milled and washed by using numerical control gantry milling, then the weld of whole ring pipe (1) is radiographed, then the first connecting pipe (2), the second connecting pipe (3), the third connecting pipe (4) and the fourth connecting pipe (5) are blocked by using pipe blocking tooling, and the liquid outlet hole (6) is blocked by using hole blocking tooling, the sanitary ring pipe is subjected to water leakage test under the pressure of not less than 0.8Mpa water pressure; Step fourteen, first, the inner cavity of the sanitary ring pipe is pickled and passivated, then the inner cavity of the sanitary ring pipe is rinsed and cleaned, finally, the sanitary ring pipe is subjected to quality inspection.

2. A method of processing sanitary annular tubing according to claim 1, wherein, In the step four, the hand-held polishing machine comprises a servo motor (10) and a handle (11) fixed to the tail end of the servo motor (10); the output shaft of the servo motor (10) is coaxially connected with one end of a first transmission shaft (12); the other end of the first transmission shaft (12) is connected with one end of a second transmission shaft (14) through a universal joint (13); the other end of the second transmission shaft (14) is coaxially fixed with a polishing wheel (15).

3. A method of processing sanitary annular tubing according to claim 1 or 2, characterized in that, In the step eight, the connecting pipe positioning tooling comprises a positioning support (16) in U-shaped structure; the edges of the two end portions of the positioning support (16) are in arc-shaped structure; the edges of the two end portions of the positioning support (16) can be fitted on the circumferential outer wall of the whole ring pipe (1); the two side arms of the positioning support (16) are connected through a support strip (17); a positioning rod (18) is slidably inserted through the support strip (17); one end portion of the positioning rod (18) slidably penetrates the middle arm of the positioning support (16); the other end of the positioning rod (18) is coaxially fixed with an extension column (19).

4. A method of processing sanitary annular tubing according to claim 3, wherein In the step nine, the stud positioning tooling comprises a bearing plate (20); one surface of the bearing plate (20) is fixed with a pair of positioning columns (21) in annular direction; one end of the positioning column (21) is coaxially fixed with a plug column (22); one surface of the bearing plate (20) is provided with a pair of matching holes (23) in annular direction; the two pairs of matching holes (23) are respectively arranged on the two sides of the two positioning columns (21).

5. A method of processing sanitary annular tubing according to claim 4, wherein, In the step thirteen, the pipe blocking tooling comprises a U-shaped block (24) and a first sealing column (25) arranged on the inner side of the U-shaped block (24); the two ends of the U-shaped block (24) are provided with hooks; the middle arm of the U-shaped block (24) is threadedly fitted with a perpendicular locking stud (26); one end of the locking stud (26) abuts against one end face of the first sealing column (25).

6. A method of processing sanitary annular tubing according to claim 4 or 5, characterized in that In the step thirteen, the hole blocking tool comprises a mounting plate (27) and a second sealing column (28) vertically fixed to one surface of the mounting plate (27); one surface of the mounting plate (27) is provided with a pair of accommodating holes corresponding to the threaded columns (7) in the annular direction; the threaded columns (7) are inserted into the accommodating holes; and the threaded columns (7) are threadedly matched with lock nuts (29).

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