An adjustable diameter-expanding assembly for stainless steel pipes

Abstract

The present invention discloses an adjustable diameter expanding assembly for stainless steel pipes, which includes a clamping main body. The clamping main body includes a base, and a pedestal is fixedly connected to the top of the base. A fixture assembly for fixing the outer surface of the steel pipe is arranged inside the pedestal, and a diameter expanding assembly. The diameter expanding assembly includes an equipment box. The present invention relates to the technical field of steel pipe flaring. The adjustable diameter expanding assembly for stainless steel pipes can effectively solve the problems in the prior art that when expanding the orifice of stainless steel, the volatile oil is usually stored in a container. For a batch of long and thin steel pipes to be flared, the ends to be flared need to be dipped into the volatile oil one by one, which is very troublesome (usually by tilting the container and bending the long and thin steel pipes at the same time), and the effective length of dipping the volatile oil cannot be controlled. When expanding the orifice horizontally subsequently, it is easy to cause the volatile oil to flow into the inside of the thin steel pipe, affecting subsequent welding and other problems.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe flaring, and particularly relates to an adjustable diameter expanding assembly for stainless steel pipes. Background Art

[0002] Some stainless steel pipes need to be necked and flared before they can be used to produce products. Necking and flaring of stainless steel pipes is a forming process in which a pre-formed steel pipe has its mouth part reduced or enlarged through necking and flaring dies.

[0003] Carry the product to be flared to the side of the flaring equipment workbench, and neatly place the port to be flared facing the flaring punch; adjust the fixture limit to correspond to the flaring size. For some thin steel pipes, the flaring end needs to be dipped in volatile oil, and then the steel pipe dipped in volatile oil is placed in the flaring fixture and pressed against the static die notch, aligning the pipe orifice with the fixture limit, and step on the foot switch to perform flaring. Volatile oil is usually stored in a container. For a batch of long and thin steel pipes to be flared, their flaring ends need to be dipped in volatile oil one by one, which is very troublesome (usually by tilting the container and bending the long and thin steel pipes at the same time), and the effective length of dipping in volatile oil cannot be controlled. During subsequent horizontal flaring, it is easy for the volatile oil to flow into the interior of the thin steel pipe, affecting subsequent welding, etc. Summary of the Invention

[0004] Technical Problem to be Solved

[0005] In view of the above-mentioned drawbacks of the prior art, the present invention provides an adjustable diameter expanding assembly for stainless steel pipes, which can effectively solve the problems in the prior art that when flaring stainless steel, volatile oil is usually stored in a container. For a batch of long and thin steel pipes to be flared, their flaring ends need to be dipped in volatile oil one by one, which is very troublesome (usually by tilting the container and bending the long and thin steel pipes at the same time), and the effective length of dipping in volatile oil cannot be controlled. During subsequent horizontal flaring, it is easy for the volatile oil to flow into the interior of the thin steel pipe, affecting subsequent welding, etc.

[0006] Technical Solution

[0007] To achieve the above object, the present invention is realized through the following technical solutions:

[0008] The present invention provides an adjustable diameter expanding assembly for stainless steel pipes, comprising:

[0009] A clamping main body, the clamping main body includes a base, a pedestal is fixedly connected to the top of the base, and a fixture assembly for fixing the outer surface of the steel pipe is arranged inside the pedestal;

[0010] Diameter-expanding assembly, the diameter-expanding assembly includes an equipment box, an electric slide rail fixedly connected to the top of the base and slidably connected to the bottom of the equipment box, and an oiling assembly and a flaring punch are respectively slidably connected to one side of the equipment box close to the fixture assembly;

[0011] Among them, the oiling assembly includes a connecting frame, the upper surface of the connecting seat of the equipment box is slidably connected to the outer surface of the connecting frame, an oiling pipe fixedly connected to the inner side of the connecting frame and slidably connected to the inside of the connecting seat of the equipment box, the oiling pipe is slidably connected with an oiling member through a limiting ring arranged on its inner wall, and an adjusting member for driving the oiling member to rotate is arranged inside the oiling pipe.

[0012] Further, the fixture assembly includes a fixed mold and a movable mold, the inside of the fixed mold is detachably installed inside the base through a bolt group, the inside of the base is slidably connected to the inside of the movable mold through a connecting rod, and one side of the movable mold away from the fixed mold is fixedly connected with a pneumatic telescopic rod fixedly connected to the top of the base.

[0013] Further, the limiting ring includes an outer connecting ring and an inner connecting ring, the outer connecting ring is sleeved on the circumferential outer surface of the inner connecting ring, the inner side of the outer connecting ring is rotatably connected to the outer surface of the inner connecting ring, the outer surface of the outer connecting ring is fixedly connected to the inner wall of the oiling pipe, a through hole is opened inside the outer connecting ring, and a special-shaped hole is opened inside the inner connecting ring.

[0014] Further, the oiling member includes an oil storage pipe, the circumferential outer surface of the oil storage pipe is slidably connected to the inner side of the inner connecting ring, the outer surface of the oil storage pipe is fixedly communicated with a water-permeable plate slidably connected to the inner wall of the special-shaped hole, a sponge block is fixedly connected to one side of the water-permeable plate away from the oil storage pipe, a square rod is fixedly connected to one end of the oil storage pipe close to the flaring punch, and a threaded rod is rotatably connected to one end of the square rod away from the oil storage pipe.

[0015] Further, the adjusting member includes an adjusting rod, one end of the adjusting rod away from the oil storage pipe is rotatably connected to the inside of the oiling pipe, a square hole slidably connected to the outer surface of the square rod is opened inside the adjusting rod, a threaded block threadedly connected to the outer surface of the threaded rod is fixedly connected to the inner wall of one end of the square hole away from the square rod, and a spiral groove is opened on the outer surface of the adjusting rod.

[0016] Further, a support rod is slidably connected to the inner wall of the through hole, there are two support rods and they are symmetrically distributed with the square rod as the center, a support ring slidably connected to the inner wall of the oiling pipe is fixedly connected to the outer surface of a pair of support rods, a light ball fitted to the inner wall of the spiral groove is fixedly connected to one side of the support rod close to the square rod, and the support ring is connected to the inner wall of the oiling pipe through a strong spring arranged on its outer surface.

[0017] Further, a convex ring is fixedly connected to one end of the oiling pipe away from the connecting frame.

[0018] Beneficial effects

[0019] The technical solution provided by the present invention has the following beneficial effects compared with the prior art:

[0020] The present invention is provided with an oiling component. When a steel pipe is held by hand and slides along one side of the fixed mold, the end of the steel pipe passes through the convex ring on the oiling component. The end face of the steel pipe contacts the supporting rod, driving the supporting rod to slide along the inner wall of the through hole, driving the supporting ring to slide horizontally along the inner wall of the oiling pipe, and the light ball to slide along the spiral groove on the adjusting part. Since the light ball is affected by the acting force of the supporting rod and moves horizontally, the adjusting rod on the adjusting part is driven to rotate around the inside of the oiling pipe, driving the whole oiling part to rotate. At this time, during the pushing process of the steel pipe, the sponge block on the oiling part continuously rotates and oils the inner wall of the steel pipe until the end face of the steel pipe abuts against the outer surface of the limiting ring and stops moving, realizing the limitation of the steel pipe. During this process, the sponge block and the inner wall of the steel pipe are always in close contact, and the two perform relative rotation and horizontal movement, so that the inner wall of the steel pipe is evenly coated with volatile oil, and the coating length of the volatile oil is determined by the sliding length of the steel pipe (matching the flaring length), and the sliding length is set by the limitation of the limiting ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the state transformation of the diameter-expanding component in a three-dimensional state of an embodiment of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the state transformation of the fixture component in a three-dimensional state of an embodiment of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the diameter-expanding component in a three-dimensional multi-angle of an embodiment of the present invention;

[0026] Figure 5 It is a structural schematic diagram of a three-dimensional partial section of the oiling component of an embodiment of the present invention;

[0027] Figure 6 It is a three-dimensional structural schematic diagram of the length change of the oiling part of an embodiment of the present invention;

[0028] Figure 7 It is a three-dimensional structural schematic diagram of the angle rotation of the oiling part and the adjusting part of an embodiment of the present invention;

[0029] Figure 8 Schematic diagram of the three-dimensional separation structure of the oiling component in the embodiment of the present invention;

[0030] Figure 9 Schematic diagram of the partial cross-section of the oiling part and the three-dimensional structure of the adjusting part in the embodiment of the present invention;

[0031] Figure 10 Schematic diagram of the three-dimensional separation and partial cross-section structure of the oiling part in the embodiment of the present invention.

[0032] The reference numerals in the figure respectively represent: 1, clamping main body; 11, base; 12, pedestal; 13, fixture assembly; 131, fixed mold; 132, movable mold; 133, pneumatic telescopic rod; 2, diameter-expanding assembly; 21, equipment box; 22, electric slide rail; 23, oiling assembly; 231, connecting frame; 232, oiling pipe; 2321, convex ring; 233, limiting ring; 2331, external connecting ring; 2332, internal connecting ring; 2333, through hole; 2334, special-shaped hole; 234, oiling part; 2341, oil storage pipe; 2342, water-permeable plate; 2343, sponge block; 2344, square rod; 2345, threaded rod; 235, adjusting part; 2351, adjusting rod; 2352, square hole; 2353, threaded block; 2354, spiral groove; 236, support rod; 237, support ring; 238, light ball; 239, strong spring; 24, flaring punch. Detailed implementation manners

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] The present invention will be further described below with reference to the embodiments.

[0035] Embodiment:

[0036] Please refer to Figures 1-10 , the present invention provides a technical solution: an adjustable diameter-expanding assembly for stainless steel pipes, including:

[0037] A clamping main body 1, the clamping main body 1 includes a base 11, a pedestal 12 is fixedly connected to the top of the base 11, and a fixture assembly 13 for fixing the outer surface of the steel pipe is arranged inside the pedestal 12;

[0038] The diameter-expanding assembly 2, the diameter-expanding assembly 2 includes an equipment box 21, an electric slide rail 22 is fixedly connected to the top of the base 11 and is slidably connected to the bottom of the equipment box 21, and an oiling assembly 23 and a flaring punch 24 are respectively slidably connected to one side of the equipment box 21 close to the fixture assembly 13;

[0039] Among them, the oiling assembly 23 includes a connecting frame 231, the upper surface of the connecting seat of the equipment box 21 is slidably connected to the outer surface of the connecting frame 231, an oiling pipe 232 is fixedly connected to the inner side of the connecting frame 231 and is slidably connected to the inside of the connecting seat of the equipment box 21, an oiling member 234 is slidably connected to the oiling pipe 232 through a limiting ring 233 arranged on its inner wall, and an adjusting member 235 for driving the oiling member 234 to rotate is arranged inside the oiling pipe 232.

[0040] The fixture assembly 13 includes a fixed mold 131 and a movable mold 132. The fixed mold 131 is detachably installed inside the base 12 through a bolt group. The inner side of the base 12 is slidably connected to the inside of the movable mold 132 through a connecting rod. A pneumatic telescopic rod 133 fixedly connected to the top of the base 12 is fixedly connected to one side of the movable mold 132 away from the fixed mold 131.

[0041] The limiting ring 233 includes an outer connecting ring 2331 and an inner connecting ring 2332. The outer connecting ring 2331 is sleeved on the circumferential outer surface of the inner connecting ring 2332. The inner side of the outer connecting ring 2331 is rotatably connected to the outer surface of the inner connecting ring 2332 (axial relative sliding does not occur between the outer connecting ring 2331 and the inner connecting ring 2332, and a snap-fit nested rotation installation can be adopted). The outer surface of the outer connecting ring 2331 is fixedly connected to the inner wall of the oiling pipe 232. A through hole 2333 is opened inside the outer connecting ring 2331, and a special-shaped hole 2334 is opened inside the inner connecting ring 2332.

[0042] The oiling member 234 includes an oil storage pipe 2341. The circumferential outer surface of the oil storage pipe 2341 is slidably connected to the inner side of the inner connecting ring 2332. A water-permeable plate 2342 fixedly communicated with the outer surface of the oil storage pipe 2341 is slidably connected to the inner wall of the special-shaped hole 2334. A sponge block 2343 is fixedly connected to one side of the water-permeable plate 2342 away from the oil storage pipe 2341. There are two groups of sponge blocks 2343 and they are evenly distributed horizontally to prevent the volatile oil inside the oil storage pipe 2341 from continuously flowing into the sponge block 2343 through the water-permeable plate 2342 too much (only 1 / 3 of the volatile oil is filled in the oil storage pipe 2341). Only when the sponge block 2343 rotates and wipes, the volatile oil can enter the sponge block 2343 through the water-permeable plate 2342, controlling the oil volume in the sponge block 2343 and reducing waste. A square rod 2344 is fixedly connected to one end of the oil storage pipe 2341 close to the flaring punch 24, and a threaded rod 2345 is rotatably connected to one end of the square rod 2344 away from the oil storage pipe 2341.

[0043] The adjusting member 235 includes an adjusting rod 2351. One end of the adjusting rod 2351 away from the oil storage pipe 2341 is rotatably connected to the inside of the oil wiping pipe 232. A square hole 2352 is formed inside the adjusting rod 2351 and is slidably connected to the outer surface of the square rod 2344. One end inner wall of the square hole 2352 away from the square rod 2344 is fixedly connected with a threaded block 2353 threadedly connected to the outer surface of the threaded rod 2345. A spiral groove 2354 is formed on the outer surface of the adjusting rod 2351.

[0044] A support rod 236 is slidably connected to the inner wall of the through hole 2333. There are two support rods 236 and they are symmetrically distributed with the square rod 2344 as the center. A support ring 237 fixedly connected to the outer surface of a pair of support rods 236 is slidably connected to the inner wall of the oil wiping pipe 232. One side of the support rod 236 close to the square rod 2344 is fixedly connected with a light ball 238 that fits the inner wall of the spiral groove 2354. The support ring 237 is connected to the inner wall of the oil wiping pipe 232 through a strong spring 239 provided on its outer surface.

[0045] One end of the oil wiping pipe 232 away from the connecting frame 231 is fixedly connected with a convex ring 2321. The convex ring 2321 plays a role in supporting and blocking the end of the oil wiping pipe 232 (to support the steel pipe from sliding in), preventing the volatile oil inside the sponge block 2343 from dripping and flowing out of the oil wiping pipe 232. When there is some volatile oil in the space surrounded by the convex ring 2321 and the oil wiping pipe 232, a syringe tip is used to re-inject the volatile oil into the oil pipe 2341.

[0046] Reference Figures 1-10 , some existing stainless steel pipes need to be necked and flared to produce products. Usually, the product to be flared is carried to the side of the flaring equipment workbench, and the port to be flared is neatly placed facing the flaring punch; the fixture limit is adjusted to correspond to the flaring size. For some thin steel pipes, the flaring end needs to be dipped in volatile oil (without dipping in volatile oil, the extrusion force of the flaring needle is likely to cause defects such as cracking, skewing, and wrinkling of the pipe orifice). Then, the steel pipe dipped in volatile oil is placed in the flaring fixture and pressed against the static die notch, aligning the pipe orifice with the fixture limit, and stepping on the foot switch to perform flaring. The volatile oil is usually stored in a container. For a batch of long and thin steel pipes to be flared, their flaring ends need to be dipped in volatile oil one by one, which is very troublesome (usually by tilting the container and bending the long and thin steel pipes at the same time for dipping), and the effective length of dipping in volatile oil cannot be controlled. When performing horizontal flaring subsequently, it is easy for the volatile oil to flow into the thin steel pipe, affecting subsequent welding, etc.;

[0047] In order to overcome the above-mentioned existing defects, the present invention designs an adjustable diameter expansion assembly for stainless steel pipes.

[0048] Specifically, initially, the fixed mold 131 and the movable mold 132 on the fixture assembly 13 are in a separated state, facilitating the insertion of the steel pipe. Subsequently, the electric slide rail 22 on the diameter-expanding assembly 2 drives the equipment box 21, the oiling assembly 23, and the flaring punch 24 to move synchronously towards the pneumatic telescopic rod 133 until the stroke is maximized. At this time, the center line of the oiling assembly 23 coincides with the semi-circular center line of the fixed mold 131. Then, the electric push rod inside the equipment box 21 drives the entire oiling assembly 23 to slide into the space enclosed by the fixed mold 131 and the movable mold 132 (the outer surface of the oiling assembly 23 slides along one side of the fixed mold 131) until the connecting frame 231 of the oiling assembly 23 fits against the outer surface of the connecting seat of the equipment box 21 (at this time, the stroke of the oiling assembly 23 is maximized).

[0049] The oiling and limiting of the steel pipe are carried out synchronously:

[0050] Hold the steel pipe and slide it along one side of the fixed mold 131. Visually observe that the end of the steel pipe passes through the convex ring 2321 on the oiling assembly 23. At this time, the convex ring 2321 wraps the outer surface of the steel pipe. Continue to slide the steel pipe. The steel pipe contacts the end face of the support rod 236 (the width of the end face of the support rod 236 is much larger than the wall thickness of the steel pipe), driving the support rod 236 to slide along the inner wall of the through hole 2333, driving the support ring 237 to slide horizontally along the inner wall of the oiling pipe 232, and the light ball 238 to slide along the spiral groove 2354 on the adjusting part 235 (the strong spring 239 is compressed). Since the light ball 238 is subjected to the force of the support rod 236 and moves horizontally, it further drives the adjusting rod 2351 on the adjusting part 235 to rotate inside the oiling pipe 232, driving the entire oiling part 234 to rotate. At this time, during the pushing process of the steel pipe, the sponge block 2343 on the oiling part 234 continuously rotates and oils the inner wall of the steel pipe (the oil storage pipe 2341 is pre-filled with volatile oil through a valve). Until the end face of the steel pipe abuts against the outer surface of the limiting ring 233 and stops moving, the limiting of the steel pipe is realized. During this process, the sponge block 2343 and the inner wall of the steel pipe are always in close contact, and the two perform relative rotation and horizontal movement, so that the inner wall of the steel pipe is evenly coated with volatile oil, and the coating length of the volatile oil is determined by the sliding length of the steel pipe (matching the flaring length), and the sliding length is set by the limiting of the limiting ring 233.

[0051] To sum up, first, through the cooperation of the oiling assembly 23 and the sliding of the steel pipe, the inner wall of the steel pipe is evenly coated with volatile oil, and the coating length of the volatile oil matches the flaring length. With the limitation of the limiting ring 233, it successfully overcomes the trouble of having to dip the volatile oil one by one at the end to be flared for the existing long and thin steel pipes. Secondly, it avoids the situation where there is also volatile oil on the outside of the steel pipe, facilitating subsequent oil removal. Thirdly, the inner wall of the steel pipe is evenly coated with volatile oil (with a limited content), and then flaring is carried out to avoid the situation where the volatile oil flows into the inside of the thin steel pipe.

[0052] The flaring of the steel pipe:

[0053] After the end face of the steel pipe abuts against the outer surface of the limit ring 233, step on the foot switch, and the pneumatic telescopic rod 133 pushes the moving die 132 to cooperate with the fixed die 131 to clamp and fix the outer surface of the steel pipe (the space enclosed by the fixed die 131 and the moving die 132 is larger than the outer diameter of the oiling assembly 23). Then, the electric push rod inside the equipment box 21 drives the oiling assembly 23 to reset as a whole. At the same time, the support ring 237 is affected by the elastic force of the strong spring 239, driving the adjusting part 235 and the support rod 236 to reset, facilitating the continuous application of volatile oil in the follow-up. Then, the electric slide rail 22 drives the equipment box 21, the oiling assembly 23, and the flaring punch 24 to move synchronously away from the pneumatic telescopic rod 133 until the stroke is maximized. At this time, the center line of the flaring punch 24 coincides with the semi-circular center line of the fixed die 131 (the stroke of the electric slide rail 22 is the same as the distance between the center lines of the oiling assembly 23 and the flaring punch 24), and the flaring punch 24 flares the end of the steel pipe smeared with volatile oil.

[0054] During the flaring of the steel pipe, there may be deviations in the flaring and oiling length of the steel pipe that need to be fine-tuned. At this time, after the machine stops, the threaded rod 2345 can be manually rotated around the threaded block 2353, driving the square rod 2344 to slide along the inner wall of the square hole 2352, driving the oil storage pipe 2341 to slide along the inner side of the inner connection ring 2332, and the sponge block 2343 to slide along the inner wall of the special-shaped hole 2334, thereby changing the effective lengths of the oil storage pipe 2341 and the sponge block 2343. Without changing the sliding stroke of the steel pipe (the position of the limit ring 233 remains unchanged), the flaring and oiling length of the steel pipe is adjustable (by replacing the flaring punch 24 and the fixture assembly 13, the oiling requirements for the flaring length within a certain range can be met).

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. An adjustable diameter expanding assembly for stainless steel pipes, characterized in that, Comprising: A clamping main body (1), the clamping main body (1) includes a base (11), a pedestal (12) is fixedly connected to the top of the base (11), and a fixture assembly (13) for fixing the outer surface of a steel pipe is arranged inside the pedestal (12); An expanding diameter assembly (2), the expanding diameter assembly (2) includes an equipment box (21), an electric slide rail (22) fixedly connected to the top of the base (11) and slidably connected to the bottom of the equipment box (21), and an oiling assembly (23) and an expanding punch (24) are respectively slidably connected to one side of the equipment box (21) close to the fixture assembly (13); Wherein, the oiling assembly (23) includes a connecting frame (231), the upper surface of the connecting seat of the equipment box (21) is slidably connected to the outer surface of the connecting frame (231), an oiling pipe (232) fixedly connected to the inner side of the connecting frame (231) and slidably connected to the inside of the connecting seat of the equipment box (21) is arranged, an oiling member (234) is slidably connected to the oiling pipe (232) through a limiting ring (233) arranged on the inner wall thereof, and an adjusting member (235) for driving the oiling member (234) to rotate is arranged inside the oiling pipe (232); The limiting ring (233) includes an outer connecting ring (2331) and an inner connecting ring (2332), the outer connecting ring (2331) is sleeved on the circumferential outer surface of the inner connecting ring (2332), the inner side of the outer connecting ring (2331) is rotatably connected to the outer surface of the inner connecting ring (2332), the outer surface of the outer connecting ring (2331) is fixedly connected to the inner wall of the oiling pipe (232), a through hole (2333) is opened inside the outer connecting ring (2331), and a special-shaped hole (2334) is opened inside the inner connecting ring (2332); The oiling member (234) includes an oil storage pipe (2341), the circumferential outer surface of the oil storage pipe (2341) is slidably connected to the inner side of the inner connecting ring (2332), a water permeable plate (2342) fixedly communicated with the outer surface of the oil storage pipe (2341) and slidably connected to the inner wall of the special-shaped hole (2334) is arranged, a sponge block (2343) is fixedly connected to one side of the water permeable plate (2342) away from the oil storage pipe (2341), a square rod (2344) is fixedly connected to one end of the oil storage pipe (2341) close to the expanding punch (24), and a threaded rod (2345) is rotatably connected to one end of the square rod (2344) away from the oil storage pipe (2341); The adjusting member (235) includes an adjusting rod (2351), one end of the adjusting rod (2351) away from the oil storage pipe (2341) is rotatably connected to the inside of the oiling pipe (232), a square hole (2352) slidably connected to the outer surface of the square rod (2344) is opened inside the adjusting rod (2351), a threaded block (2353) threadedly connected to the outer surface of the threaded rod (2345) is fixedly connected to the inner wall of one end of the square hole (2352) away from the square rod (2344), and a spiral groove (2354) is opened on the outer surface of the adjusting rod (2351); A support rod (236) is slidably connected to the inner wall of the through hole (2333). There are two support rods (236), which are symmetrically distributed with the square rod (2344) as the center. A support ring (237) fixedly connected to the outer surface of the pair of support rods (236) and slidably connected to the inner wall of the oil wiping pipe (232) is provided. A light ball (238) that fits against the inner wall of the spiral groove (2354) is fixedly connected to one side of the support rod (236) close to the square rod (2344). The support ring (237) is connected to the inner wall of the oil wiping pipe (232) through a strong spring (239) provided on its outer surface.

2. The adjustable diameter-expanding assembly for stainless steel pipes according to claim 1, wherein: The fixture assembly (13) includes a fixed mold (131) and a movable mold (132). The fixed mold (131) is detachably installed inside the base (12) through a bolt group. The inner side of the base (12) is slidably connected to the inside of the movable mold (132) through a connecting rod. An air cylinder telescopic rod (133) fixedly connected to the top of the base (12) is fixedly connected to one side of the movable mold (132) away from the fixed mold (131).

3. The adjustable diameter expanding assembly for stainless steel pipes according to claim 1, wherein: A convex ring (2321) is fixedly connected to one end of the oil wiping pipe (232) away from the connecting frame (231).

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