Core rod structure with adjustable outer diameter

Abstract

The utility model discloses a core rod structure with an adjustable outer diameter, and relates to the field of preparation and processing of titanium alloy pipes. The device specifically comprises a threaded rod, a special-shaped sliding sleeve arranged on the threaded rod in a sleeving mode, a special-shaped combined sleeve arranged on the special-shaped sliding sleeve in a sleeving mode, an adjusting nut connected to the threaded rod in a threaded mode and connected with one end of the special-shaped sliding sleeve in an abutting mode, and a limiting column coaxially and fixedly connected to the end, away from the adjusting nut, of the threaded rod. The compression spring sleeves the threaded rod; the sliding sleeve is slidably connected with the threaded rod. The special-shaped combined sleeve is formed by splicing four special-shaped combined sleeve components, the inner walls of the special-shaped combined sleeve components are in sliding connection with the outer wall of the special-shaped sliding sleeve in the inclined direction, and the special-shaped combined sleeve components are in sliding connection with the limiting columns in the radial direction. On one hand, the device can adapt to deformation generated in the titanium alloy pipe machining process, good supporting performance is guaranteed, and on the other hand, the core rod structure can be easily taken out of the deformed titanium alloy pipe.

Description

Technical Field

[0001] This utility model relates to the field of preparation and processing of titanium alloy tubes, specifically to a mandrel structure with adjustable outer diameter. Background Technology

[0002] Aerospace gas cylinders must possess high reliability and safety, thus requiring materials with high strength and plasticity. Titanium alloys, due to their high specific strength, excellent corrosion resistance, and non-magnetic properties, are ideal raw materials for manufacturing aerospace gas cylinders. Applying titanium alloys to seamless high-pressure gas cylinders can significantly reduce cylinder weight, improve corrosion resistance and service life, lower maintenance and repair costs, and ultimately enhance safety, mobility, stability, and reliability.

[0003] The mandrel, as a support in the processing of titanium alloy tubes, plays a decisive role in the rigidity of the tubes. In current processing, mandrels are mostly made of aluminum rods, rubber rods, etc., with a fixed diameter. However, titanium alloy tubes are prone to deformation and vibration during actual processing. The deformed titanium alloy tubes are not standard circular cross-sections, which means that the mandrel with a fixed diameter cannot provide good support, cannot enhance the overall rigidity of the tube, and may even increase the bending deformation and local thin spots of the titanium alloy tubes during processing, resulting in a low yield of titanium alloy tubes. On the other hand, due to the deformation of titanium alloy tubes during processing, it is very difficult to remove the mandrel with a fixed diameter, which can easily cause deformation and scratches to the titanium alloy tubes. Utility Model Content

[0004] This invention provides a mandrel structure with an adjustable outer diameter to solve the problems of existing mandrels having a fixed diameter, resulting in poor support for titanium alloy tubes that deform during processing, low yield of titanium alloy tubes, and difficulty in mandrel removal.

[0005] The mandrel structure with adjustable outer diameter of this utility model adopts the following technical solution:

[0006] The device includes: a threaded rod, a special-shaped sliding sleeve sleeved on the threaded rod, a special-shaped combined sleeve sleeved on the special-shaped sliding sleeve, an adjusting nut threadedly connected to the threaded rod and abutting against one end of the special-shaped sliding sleeve, a limiting post coaxially fixedly connected to one end of the threaded rod away from the adjusting nut, and a compression spring sleeved on the threaded rod and abutting between the special-shaped sliding sleeve and the limiting post.

[0007] The sliding sleeve is slidably connected to the threaded rod;

[0008] The irregularly shaped combined sleeve is assembled from four irregularly shaped combined sleeve components. The inner wall of the irregularly shaped combined sleeve component is slidably connected to the outer wall of the irregularly shaped sliding sleeve in an inclined direction, and the irregularly shaped combined sleeve component is slidably connected to the limiting post in a radial direction.

[0009] Preferably, the outer wall of the irregular sliding sleeve is provided with a plurality of protrusions arranged in an array along the circumferential and axial directions, and the inner wall of the irregular combined sleeve is provided with a plurality of inclined grooves corresponding one-to-one with the positions of the protrusions; the protrusions are slidably connected to the inclined grooves.

[0010] Preferably, the irregularly shaped sliding sleeve is provided with four protrusions arranged in a circumferential ring array.

[0011] Preferably, the inner end of the irregularly shaped combined sleeve component is embedded on the circumferential surface of the limiting post and is slidably connected to the limiting post in the radial direction.

[0012] Preferably, an extension tube is threaded onto one end of the threaded rod near the adjusting nut.

[0013] Preferably, the outer wall of the irregularly shaped combined sleeve is provided with multiple annular grooves, and an elastic ring is embedded in the annular grooves.

[0014] The advantages of this utility model compared to the prior art are:

[0015] In this invention, the limiting post can restrict the axial movement of the irregularly shaped combined sleeve component along the threaded rod. At the same time, since the inner wall of the irregularly shaped combined sleeve component and the outer wall of the irregularly shaped sliding sleeve are slidably connected in the inclined direction, when the irregularly shaped sliding sleeve moves along the axial direction of the threaded rod, the irregularly shaped combined sleeve component will only move radially under the push of the irregularly shaped sliding sleeve. When the irregularly shaped combined sleeve component moves radially, the outer diameter of the irregularly shaped combined sleeve is flexibly adjustable. On the one hand, it can adapt to the deformation generated during the processing and ensure good support. On the other hand, it can also easily remove the mandrel structure from the deformed titanium alloy tube. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a cross-sectional view of the present invention.

[0018] Figure 2 This utility model is based on Figure 1 A cross-sectional view along the AA direction.

[0019] Figure 3 This is a front view of the threaded rod and the limiting post of this utility model.

[0020] Explanation of reference numerals in the attached figures

[0021] 1. Threaded rod; 2. Irregular sliding sleeve; 3. Irregular combined sleeve; 4. Adjusting nut; 5. Limiting post; 6. Compression spring; 7. Extension tube; 8. Elastic ring; 21. Protrusion; 31. Irregular combined sleeve component; 51. Slide groove; 311. Inclined groove; 312. Extension section. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] An embodiment of the mandrel structure with adjustable outer diameter according to this utility model, such as... Figures 1 to 3 As shown, the device includes: a threaded rod 1, a non-shaped sliding sleeve 2 sleeved on the threaded rod 1, a non-shaped combined sleeve 3 sleeved on the non-shaped sliding sleeve 2, an adjusting nut 4 threadedly connected to the threaded rod 1 and abutting against one end of the non-shaped sliding sleeve 2, a limiting post 5 coaxially fixedly connected to one end of the threaded rod 1 away from the adjusting nut 4, and a compression spring 6 sleeved on the threaded rod 1 and abutting between the non-shaped sliding sleeve 2 and the limiting post 5;

[0024] The sliding sleeve 2 is slidably connected to the threaded rod 1;

[0025] The irregularly shaped combined sleeve 3 is assembled from four irregularly shaped combined sleeve components 31. The inner wall of the irregularly shaped combined sleeve component 31 is slidably connected to the outer wall of the irregularly shaped sliding sleeve 2 in an inclined direction, and the irregularly shaped combined sleeve component 31 is slidably connected to the limiting post 5 in a radial direction.

[0026] In this embodiment, it should be noted that the outer wall of the irregularly shaped combined sleeve component 31 is a quarter-cylindrical surface.

[0027] In this embodiment, it should be noted that the limiting post 5 restricts the axial movement of the irregularly shaped combined sleeve component 31 along the threaded rod 1. At the same time, since the inner wall of the irregularly shaped combined sleeve component 31 and the outer wall of the irregularly shaped sliding sleeve 2 are slidably connected in the inclined direction, when the irregularly shaped sliding sleeve 2 moves along the axial direction of the threaded rod 1, the irregularly shaped combined sleeve component 31 will only move radially under the push of the irregularly shaped sliding sleeve 2. When the irregularly shaped combined sleeve component 31 moves radially, the outer diameter of the irregularly shaped combined sleeve 3 can be adjusted.

[0028] In this embodiment, the outer wall of the irregular sliding sleeve 2 is provided with a plurality of protrusions 21 arranged in a circumferential and axial array, and the inner wall of the irregular combined sleeve 3 is provided with a plurality of inclined grooves 311 corresponding one-to-one with the positions of the protrusions; the protrusions 21 are slidably connected to the inclined grooves 311.

[0029] In this embodiment, it should be noted that the width of the protrusion 21 is adapted to the width of the inclined groove 311, and the protrusion 21 can slide in the inclined groove 311.

[0030] In this embodiment, the irregular sliding sleeve 2 is provided with four protrusions 21 arranged in a circumferential ring array.

[0031] In this embodiment, it should be noted that the inclined grooves 311 on the inner wall of the irregularly shaped combined sleeve component 31 are arranged in a linear array along the axial direction.

[0032] In this embodiment, the inner end of the irregularly shaped combined sleeve component 31 is embedded on the circumferential surface of the limiting post 5 and is slidably connected to the limiting post 5 in the radial direction.

[0033] In this embodiment, it should be noted that the inner wall of the irregularly shaped combined sleeve component 31 located at the limiting post 5 is provided with an extension portion 312 in the radial direction, and a sliding groove 51 is provided on the circumferential surface of the limiting post 5. The extension portion 312 is inserted into the sliding groove 51 and can slide relative to each other in the radial direction in the sliding groove 51.

[0034] In this embodiment, an extension tube 7 is threadedly connected to one end of the threaded rod 1 near the adjusting nut 4.

[0035] In this embodiment, it should be noted that the extension tube 7 serves as a handheld part, which facilitates the insertion of the mandrel structure into a long titanium alloy tube to be processed. Since the threaded rod 1 itself has external threads, any tube with a matching internal thread of any length can be used as the extension tube 7.

[0036] In this embodiment, multiple annular grooves are provided on the outer wall of the irregularly shaped combined sleeve 3, and elastic rings 8 are embedded in the annular grooves.

[0037] In this embodiment, it should be noted that multiple annular grooves are arranged along the axial direction, and the elastic ring 8 is sleeved in the annular groove. The wall thickness of the elastic ring 8 is less than the depth of the annular groove, ensuring that the elastic ring 8 is completely embedded in the annular groove and avoiding any protruding parts that may affect the processing of the titanium alloy tube.

[0038] like Figure 1As shown, in actual use, when it is necessary to increase the outer diameter of the mandrel structure, tighten the adjusting nut 4. The adjusting nut 4 moves to the right along the threaded rod 1, and at the same time pushes the irregular sliding sleeve 2 to move to the right. At this time, since the limiting post 5 restricts the axial movement of the irregular combined sleeve component 31, the protrusion 21 on the outer wall of the irregular sliding sleeve 2 pushes the irregular combined sleeve component 31 to move radially outward in the inclined groove 312, that is, the outer diameter of the irregular combined sleeve 3 increases. When it is necessary to remove the mandrel structure from the titanium alloy tube and reduce the outer diameter of the mandrel structure, loosen the adjusting nut 4. The adjusting nut 4 moves to the left, and the irregular sliding sleeve 2 moves to the left under the elastic force of the compression spring 6. Similarly, the outer diameter of the irregular combined sleeve 3 can be reduced.

[0039] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A mandrel structure with adjustable outer diameter, characterized in that, Includes a threaded rod (1), a special-shaped sliding sleeve (2) sleeved on the threaded rod (1), a special-shaped combined sleeve (3) sleeved on the special-shaped sliding sleeve (2), an adjusting nut (4) threadedly connected to the threaded rod (1) and abutting against one end of the special-shaped sliding sleeve (2), a limiting post (5) coaxially fixedly connected to one end of the threaded rod (1) away from the adjusting nut (4), and a compression spring (6) sleeved on the threaded rod (1) and abutting between the special-shaped sliding sleeve (2) and the limiting post (5); The sliding sleeve (2) is slidably connected to the threaded rod (1); The irregularly shaped combined sleeve (3) is assembled from four irregularly shaped combined sleeve components (31). The inner wall of the irregularly shaped combined sleeve component (31) is slidably connected to the outer wall of the irregularly shaped sliding sleeve (2) in an inclined direction. The irregularly shaped combined sleeve component (31) is slidably connected to the limiting post (5) in a radial direction.

2. The mandrel structure with adjustable outer diameter according to claim 1, characterized in that, The outer wall of the irregular sliding sleeve (2) is provided with a plurality of protrusions (21) arranged in a circumferential and axial array, and the inner wall of the irregular combined sleeve (3) is provided with a plurality of inclined grooves (311) corresponding one-to-one with the positions of the protrusions (21); the protrusions (21) are slidably connected to the inclined grooves (311).

3. The mandrel structure with adjustable outer diameter according to claim 2, characterized in that, The irregular sliding sleeve (2) is provided with four protrusions (21) arranged in a circumferential ring array.

4. The mandrel structure with adjustable outer diameter according to claim 1, characterized in that, The inner end of the irregularly shaped combined sleeve component (31) is embedded on the circumferential surface of the limiting post (5) and is slidably connected to the limiting post (5) in the radial direction.

5. The mandrel structure with adjustable outer diameter according to claim 1, characterized in that, An extension tube (7) is threaded to one end of the threaded rod (1) near the adjusting nut (4).

6. The mandrel structure with adjustable outer diameter according to claim 1, characterized in that, The outer wall of the irregularly shaped combined sleeve (3) is provided with multiple annular grooves, and an elastic ring (8) is embedded in the annular grooves.

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