Inner cavity supporting mechanism for stainless steel thin-wall steel pipe machining

Abstract

The invention relates to the technical field of stainless steel thin-wall steel pipe machining, in particular to a stainless steel thin-wall steel pipe machining inner cavity supporting mechanism which comprises a supporting rod, a fixing barrel is fixedly connected to the middle section of the supporting rod, the portions, located on the two sides of the fixing barrel, of the supporting rod are wrapped with annular expansion air bags, and an air cavity is formed in an inner cavity of the fixing barrel of the supporting rod. According to the inner cavity supporting mechanism for machining of the stainless steel thin-wall steel pipe, flexible self-adaptive supporting of the annular expansion air bag and point supporting of the rigid supporting roller capable of being rotationally adjusted are ingeniously combined, and a reliable limiting abutting ring, a pull rope, a contraction groove and integrated air supply are used in an auxiliary mode; the problem of supporting deformation prevention during machining of the inner cavity of the stainless steel thin-wall steel pipe is efficiently solved, meanwhile, flexible avoiding of the machining position is achieved, and the machining precision and efficiency are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of stainless steel thin-walled steel pipe processing, in particular to an inner cavity support mechanism for stainless steel thin-walled steel pipe processing. Background Art

[0002] In the field of mechanical processing, especially when drilling, milling, and other internal machining operations on thin-walled stainless steel pipes, a key challenge is how to effectively support the pipe's interior to prevent deformation. Thin-walled steel pipes inherently have limited rigidity. During machining, especially when subjected to point forces (such as drilling) or lateral forces, they are prone to plastic deformation such as dents, flattening, or ovalization due to tool pressure or clamping forces. This not only leads to a significant decrease in machining accuracy (inaccurate hole diameters and positional offsets), but can even render the workpiece scrapped.

[0003] Traditional support methods usually have the following significant defects: Rigid support blocks / plugs: Require precise matching of the inner diameter of the steel pipe, resulting in poor versatility; difficult to install and remove; when the workpiece needs to be rotated or the processing position needs to be adjusted, the support block itself may obstruct the tool path or be unable to adjust accordingly, resulting in loss of support in some areas.

[0004] Adjustable mandrel / expansion sleeve: Although they can accommodate a certain range of inner diameters, their structure is often complex and the cost is high. Their support surface is usually a continuous circle. When processing (such as drilling) needs to be performed near the support position, the support body itself will block the tool, and the support must be removed first, which makes the area to be processed lose support, posing a dilemma.

[0005] Single airbag support: Although it can provide uniform radial support force and adapt to different inner diameters, the airbag itself is flexible. When it is locally subjected to a large point load (such as drill bit impact), the airbag may be over-compressed, resulting in insufficient support and deformation of the tube wall behind it; and the airbag cannot provide precise axial positioning.

[0006] Therefore, there is an urgent need for a support mechanism that can provide reliable and uniform inner cavity support, flexibly avoid the processing area, and is easy to install and adjust, so as to meet the needs of high-quality and high-efficiency processing of stainless steel thin-walled steel pipes. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the present invention provides a stainless steel thin-walled steel pipe processing inner cavity support mechanism, which solves the above-mentioned problems.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a stainless steel thin-walled steel tube is processed into an inner cavity support mechanism, comprising a support rod, a fixed cylinder is fixedly connected to the middle section of the support rod, an annular expansion airbag is wrapped on both sides of the support rod located on the fixed cylinder, an air cavity is opened in the inner cavity of the fixed cylinder of the support rod, and an air supply mechanism for supplying air to the annular expansion airbag and the air cavity is provided on the side of the support rod; The inner cavity of the fixed cylinder is slidably sealed with a piston block through a guide groove, one end of the piston block is fixedly connected to a connecting rod that penetrates and extends to the surface of the fixed cylinder, one end of the connecting rod is rotatably connected to a support roller, the inner cavity of the air cavity is fixedly connected to a guide rod that coincides with the center line of the support rod through a positioning rod, one side of the piston block is fixedly connected to a pull rope, and the other end of the pull rope is fixedly connected to the guide rod; The support rod is located on the surface of the two side surfaces of the annular expansion airbag and is threadedly connected with an abutment ring through a threaded groove, and the abutment ring abuts the side of the annular expansion airbag for limiting the position. When in use, the support rod is placed on the inner wall of the steel pipe, and then the piston rod is driven by the driving cylinder to move the air guide groove to pressurize the internal air into the annular expansion airbag. The annular expansion airbag expands and supports the inner wall of the steel pipe for support. At this time, the air cavity is inflated, and the piston block drives the support roller to move outward to support the inner wall of the steel pipe. Then, processing is performed at this time. When punching is required, the support rod is rotated to drive the fixed cylinder to rotate and adjust its angle. At this time, the support roller squeezes the inner wall of the steel pipe and rotates, and the side of the fixed cylinder without the guide groove is directed to the hole position to be punched, and then punching is performed. It can effectively support the inner wall of the steel pipe to prevent it from being squeezed and deformed by the outside during processing, and the support position can be continuously rotated and adjusted by the setting of the support roller without affecting its normal punching operation.

[0009] As a further solution of the present invention: there are multiple guide grooves, and they are evenly arranged in the range of 10° to 350° of the fixed cylinder. The lengths of the multiple pull ropes are the same. The position of the piston block is limited by the pull rope to prevent excessive movement of a single block.

[0010] As a further solution of the present invention: the air supply mechanism includes a driving cylinder fixed on the surface of the support rod, the inner cavity of the support rod is provided with an air guide groove connected to the annular expansion airbag and the air cavity through a pipe, the inner cavity of the air guide groove is slidably connected with a piston rod, and the piston end of the driving cylinder is fixedly connected to the piston rod through a connecting piece. The driving cylinder drives the piston rod to move to squeeze the air in the air guide groove, so that the air enters the annular expansion airbag and the air cavity, causing it to expand and support the inner wall of the stainless steel pipe.

[0011] As a further solution of the present invention: a contraction groove is provided at the end of the guide groove, and the inner diameter of the contraction groove is smaller than the inner diameter of the piston block.

[0012] Compared with the prior art, the present invention has the following beneficial effects: Double support, both rigid and flexible, strong anti-deformation ability: Annular expansion airbag: provides uniform radial expansion force, fits the inner wall of the steel pipe, forms a preliminary and adaptive flexible support, effectively disperses part of the load, and adapts to a certain range of inner diameter changes.

[0013] Retractable support rollers: In addition to the initial support provided by the airbag, they provide rigid point support. Driven by air pressure, the support rollers extend directly against critical stress points on the steel pipe's inner wall (such as those near the processing point). This significantly enhances local rigidity and resistance to point pressure, effectively resisting the concentrated impact forces of drilling and other operations, and preventing pipe wall dents and deformation. The synergistic effect of the airbag and support rollers, complementing rigidity and flexibility, delivers support far superior to any single support method.

[0014] The processing position is flexible and adjustable, with good avoidance performance: The entire support mechanism (support rod) can rotate freely inside the steel pipe.

[0015] By rotating the support rod, the side without the guide groove (i.e., the side without the support roller extending) can be easily aligned with the location where processing (such as drilling) is required. At this time, there are no obstacles in front of this location (the support roller has been rotated to another direction), and the tool can directly contact and process the pipe wall without any obstacles.

[0016] At the same time, after the support roller rotates to other angles, it can still provide rigid support to the adjacent areas, ensuring the stability of the overall structure of the steel pipe during processing.

[0017] Dynamic adjustment of support position without affecting processing continuity: The support roller contacts the inner wall of the steel pipe through the support roller, rather than a fixed block. When the support rod is rotated to adjust the processing position, the support roller can roll on the inner wall of the steel pipe, avoiding hard friction or jamming with the pipe wall, making angle adjustment smooth and convenient.

[0018] Reliable positioning and limiting: Threaded abutment ring: By tightening the threads, the annular expansion airbag is compressed from the side to prevent it from axial movement during inflation or processing, ensuring that the support position is accurately fixed.

[0019] Guide grooves and pull ropes: Guide grooves precisely guide the movement of the piston blocks and support rollers. Equal length pull ropes connect each piston block to the central guide rod, effectively limiting the over-extension of a single piston block / support roller, ensuring consistent extension of all support rollers and evenly distributing the support force.

[0020] Compact structure and easy operation: A single air supply mechanism (driving cylinder + piston rod + air guide groove) is used to simultaneously control the expansion of the annular expansion airbag and the extension and retraction of the support roller, which simplifies the operating steps and external connections.

[0021] All core components are integrated on the support rod and the fixed cylinder. The overall structure is compact and easy to put into and take out of the steel pipe cavity.

[0022] Safety and anti-falling: The contraction groove at the end of the guide groove is designed with an inner diameter smaller than the diameter of the piston block, forming a mechanical stop that effectively prevents the piston block from completely falling out of the guide groove under the action of air pressure or in unexpected circumstances, thereby improving the safety of equipment use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view of the structure of the present invention; Figure 2 It is a structural side view of the fixing cylinder of the present invention.

[0024] In the figure: 1. Support rod; 2. Threaded groove; 3. Abutment ring; 4. Annular expansion airbag; 5. Fixing cylinder; 6. Support roller; 7. Guide groove; 8. Piston block; 9. Connecting rod; 10. Positioning rod; 11. Guide rod; 12. Pull rope; 13. Piston rod; 14. Driving cylinder; 15. Air guide groove. DETAILED DESCRIPTION

[0025] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0026] See also Figure 1-2 The present invention provides a technical solution: a stainless steel thin-walled steel pipe is processed into an inner cavity support mechanism, comprising a support rod 1, a fixed cylinder 5 is fixedly connected to the middle section of the support rod 1, an annular expansion airbag 4 is wrapped on both sides of the support rod 1 located on the fixed cylinder 5, an air cavity is opened in the inner cavity of the fixed cylinder 5 of the support rod 1, and an air supply mechanism for supplying air to the annular expansion airbag 4 and the air cavity is provided on the side of the support rod 1; The inner cavity of the fixed cylinder 5 is slidably sealed with a piston block 8 through a guide groove 7. One end of the piston block 8 is fixedly connected to a connecting rod 9 that penetrates and extends to the surface of the fixed cylinder 5. One end of the connecting rod 9 is rotatably connected to a support roller 6. The inner cavity of the air cavity is fixedly connected to a guide rod 11 that coincides with the center line of the support rod 1 through a positioning rod 10. A pull rope 12 is fixedly connected to one side of the piston block 8, and the other end of the pull rope 12 is fixedly connected to the guide rod 11; The surfaces of the support rod 1 located on the sides of the two annular expansion airbags 4 are threadedly connected with abutment rings 3 through threaded grooves 2, and the abutment rings 3 abut against the sides of the annular expansion airbags 4 for limiting. When in use, the support rod 1 is placed on the inner wall of the steel pipe, and then the piston rod 13 is driven by the driving cylinder 14 to move to pressurize the air guide groove 15, and the internal air enters the annular expansion airbag 4. The annular expansion airbag 4 expands to support the inner wall of the steel pipe for support. At this time, the air cavity is inflated, and the piston block 8 drives the support roller 6 to move outward and support the inner wall of the steel pipe. Then, processing is carried out at this time. When punching is required, the support rod 1 is rotated to drive the fixed cylinder 5 to rotate and adjust its angle. At this time, the support roller 6 squeezes the inner wall of the steel pipe and rotates, and the side of the fixed cylinder 5 without the guide groove 7 is directed to the hole position to be punched, and then the punching is carried out. It can effectively support the inner wall of the steel pipe to prevent it from being deformed by external extrusion during processing, and through the setting of the support roller 6, the support position can be continuously rotated and adjusted without affecting its normal punching operation.

[0027] There are multiple guide grooves 7, and they are evenly arranged in the range of 10° to 350° of the fixed cylinder 5. The multiple pull ropes 12 are of the same length. The position of the piston block 8 is limited by the pull ropes 12 to prevent excessive movement of a single piece.

[0028] The air supply mechanism includes a driving cylinder 14 fixed on the surface of the support rod 1. The inner cavity of the support rod 1 is provided with an air guide groove 15 which is connected to the annular expansion airbag 4 and the air cavity through a pipe. The inner cavity of the air guide groove 15 is slidably connected with the piston rod 13. The piston end of the driving cylinder 14 is fixedly connected to the piston rod 13 through a connecting piece. The driving cylinder 14 drives the piston rod 13 to move and squeeze the air in the air guide groove 15, so that the air enters the annular expansion airbag 4 and the air cavity, causing it to expand and support the inner wall of the stainless steel pipe.

[0029] A contraction groove is formed at the end of the guide groove 7 , and the inner diameter of the contraction groove is smaller than the inner diameter of the piston block 8 .

[0030] When the present invention is used, the installation and positioning are as follows: the support rod 1 is inserted into the inner cavity of the stainless steel thin-walled steel pipe to be processed, and adjusted to the axial position that needs to be supported.

[0031] Initial flexible support balloon inflation: Start the air supply mechanism to drive the air cylinder 14.

[0032] The driving cylinder 14 pushes the piston rod 13 to move in the air guide groove 15 inside the support rod 1 , compressing the air in the air guide groove 15 .

[0033] The compressed air is simultaneously filled into the two annular expansion air bags 4 and the air cavity in the fixed tube 5 through the pipeline.

[0034] The annular expansion airbag 4 is inflated, and its outer wall is tightly attached to the inner wall of the steel pipe, providing uniform radial support force and initially fixing the support rod 1 in the steel pipe. At the same time, the abutment ring 3 is tightened to press against the side of the airbag to prevent the airbag from moving axially.

[0035] Enhanced rigidity support roller extension: The air pressure filled into the air chamber pushes the piston block 8 to slide outward along the guide groove 7.

[0036] The piston block 8 drives the connecting rod 9 and the supporting roller 6 installed at the end of the connecting rod to move outward.

[0037] The support roller 6 is finally extended and pressed against the inner wall of the steel pipe, providing a key rigid point support. The pull rope 12 is straightened to prevent the piston block 8 from excessive movement.

[0038] Machining preparation angle adjustment: When it is necessary to perform operations such as drilling at a specific position of the steel pipe, such as a certain point, the entire support rod 1 is rotated.

[0039] The support rod 1 drives the fixed cylinder 5, the annular expansion airbag 4 and the support roller 6 to rotate together in the steel pipe.

[0040] Since the support roller 6 is designed to be in rolling contact with the pipe wall, the rotation process is smooth.

[0041] The support rod is rotated until the "blank" side wall of the fixed cylinder 5 without the guide groove 7, that is, the area outside the range of 10°-350°, is facing the position to be punched. At this time, there is no support roller extending in front of the processing point, and the field of vision and operating space are open.

[0042] At the same time, the support rollers 6 have rotated to the positions on both sides or behind the point to be processed, continuing to provide rigid support for the adjacent areas and maintaining the overall rigidity of the steel pipe.

[0043] Execute Processing: Once adjusted, you can use a drill or other tool to drill or perform other processing operations from the outside of the pipe, aligning the workpiece with the support rollers. The combined support of the airbag and support rollers effectively resists the processing forces and prevents deformation of the pipe wall.

[0044] Pressure Relief and Recovery: After processing is complete, the air supply mechanism drives cylinder 14 in the reverse direction, releasing the air pressure within air guide groove 15, annular expansion bladder 4, and the air cavity. The bladder deflates, and support roller 6 retracts upon loss of air pressure or, if necessary, spring return (not shown but implicitly or under external force). The retraction groove secures piston block 8 in place. Support rod 1 returns to its original size and can be easily removed from the steel tube.

[0045] Summary: This mechanism cleverly combines the flexible adaptive support of the annular expansion airbag and the point support of the rotatable and adjustable rigid support roller, supplemented by reliable limit abutment rings, pull ropes, shrinkage grooves and integrated air supply, effectively solving the problem of supporting and preventing deformation during the inner cavity processing of stainless steel thin-walled steel pipes. At the same time, it realizes flexible avoidance of the processing position, significantly improving the processing accuracy and efficiency.

[0046] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A stainless steel thin-walled steel pipe processing inner cavity support mechanism, comprising a support rod (1), characterized in that: The middle section of the support rod (1) is fixedly connected to a fixing cylinder (5), and both sides of the support rod (1) located on the fixing cylinder (5) are wrapped with an annular expansion airbag (4), an air cavity is provided in the inner cavity of the fixing cylinder (5) of the support rod (1), and an air supply mechanism for supplying air to the annular expansion airbag (4) and the air cavity is provided on the side of the support rod (1); The inner cavity of the fixed cylinder (5) is slidably sealed with a piston block (8) through a guide groove (7), one end of the piston block (8) is fixedly connected to a connecting rod (9) that penetrates and extends to the surface of the fixed cylinder (5), one end of the connecting rod (9) is rotatably connected to a support roller (6), the inner cavity of the air cavity is fixedly connected to a guide rod (11) that coincides with the center line of the support rod (1) through a positioning rod (10), one side of the piston block (8) is fixedly connected to a pull rope (12), and the other end of the pull rope (12) is fixedly connected to the guide rod (11); The surfaces of the support rod (1) located on the sides of the two annular expansion airbags (4) are threadedly connected to abutment rings (3) through threaded grooves (2), and the abutment rings (3) abut against the sides of the annular expansion airbags (4) to limit the position.

2. The inner cavity support mechanism for processing stainless steel thin-walled steel pipes according to claim 1, characterized in that: The guide grooves (7) are provided in plurality and are evenly arranged within a range of 10° to 350° of the fixed cylinder (5), and the lengths of the plurality of pull ropes (12) are all the same.

3. The inner cavity support mechanism for processing stainless steel thin-walled steel pipes according to claim 1, characterized in that: The air supply mechanism comprises a driving cylinder (14) fixed on the surface of a support rod (1); an inner cavity of the support rod (1) is provided with an air guide groove (15) which is connected to the annular expansion air bag (4) and the air cavity through a pipeline; the inner cavity of the air guide groove (15) is slidably connected to a piston rod (13); and a piston end of the driving cylinder (14) is fixedly connected to the piston rod (13) through a connecting piece.

4. The inner cavity support mechanism for processing stainless steel thin-walled steel pipes according to claim 1, characterized in that: A contraction groove is provided at the end of the guide groove (7), and the inner diameter of the contraction groove is smaller than the inner diameter of the piston block (8).

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