Clamping device for slender tubes with large length-to-diameter ratio
By designing components of the clamping device, such as the clamping body, the elastic clamping cone, and the rolling column, the problems of accuracy and efficiency in the processing of slender tubes with large length-to-diameter ratios were solved, achieving stable clamping and high-precision processing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAN HUASHENG MECHANICAL & ELECTRICAL TECHNOLOGY CO LTD
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-26
AI Technical Summary
Due to poor rigidity and weak cutting force, it is difficult to guarantee accuracy when machining slender tubes with a large length-to-diameter ratio, resulting in machining defects that affect quality and efficiency.
A clamping device was designed, including components such as a clamping body, an elastic clamping cone, a rolling element retainer, a rolling column, and a guide column. The device achieves stable clamping and limiting of the pipe fitting by tightening the clamping nut. The rolling column is in contact with the surface of the pipe fitting to avoid jumping. Combined with the wear resistance of the needle roller bearing, the device ensures machining accuracy.
It improves the machining accuracy and efficiency of slender tubes with large length-to-diameter ratios and is applicable to a variety of materials, especially zirconium tubes and silicon carbide tubes for third- and fourth-generation nuclear reactors.
Smart Images
Figure CN224274757U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of machining technology, and more specifically, to a clamping device for slender tubes with a large length-to-diameter ratio. Background Technology
[0002] High aspect ratio slender tubes, namely SIC / SIC composite material cladding tubes, are used to seal and protect fuel leaks. Composite material cladding tubes have excellent high temperature resistance, corrosion resistance, radiation resistance, high toughness, high strength, chemical stability at high temperatures, and excellent high temperature mechanical properties, giving them significant advantages in ensuring reactor safety and efficiency.
[0003] Slender tube machining is a precision manufacturing process for tubular parts with a large height-to-diameter ratio. It is widely used in aerospace, medical devices, precision instruments and automotive industries. Due to the characteristics of slender tubes, such as thin structure, low rigidity and easy deformation, the machining process has strict requirements on equipment precision, process parameters and clamping methods.
[0004] In the prior art, due to the poor rigidity and weak cutting force of slender tubes with large length-to-diameter ratios, it is difficult to guarantee the accuracy of slender tubes with large length-to-diameter ratios, resulting in defects in the tubes during processing, which affects the processing quality and efficiency of the tubes. The device of this application can achieve a length-to-diameter ratio of 400:1; and the device of this application can process various materials, such as zirconium tubes widely used in third-generation commercial pressurized water reactors and silicon carbide tubes used in fourth-generation advanced pressurized water reactors. Utility Model Content
[0005] To overcome the above deficiencies, this utility model provides a clamping device for slender tubes with a large length-to-diameter ratio that overcomes or at least partially solves the above technical problems.
[0006] This utility model is implemented as follows:
[0007] This utility model provides a clamping device for slender tubes with a large length-to-diameter ratio, including a clamping body. The right side of the clamping body is connected to an elastic clamping cone. A rolling element retainer passes through the elastic clamping cone. The rolling element retainer has an elongated hole, and a rolling column is provided in the elongated hole. A clamping nut is threaded to the outer surface of the clamping body. The left side of the clamping body passes through a needle roller bearing, and the other end of the needle roller bearing is disposed in a limiting sleeve.
[0008] In a preferred embodiment, both the flange and the limiting sleeve are provided with matching guide post holes. A guide post is provided in the guide post hole. The guide post passes through the guide post holes of the flange and the limiting sleeve, and the flange and the limiting sleeve are threadedly connected by a nut.
[0009] In a preferred embodiment, there are multiple elongated holes.
[0010] In a preferred embodiment, there are six guide post holes, which are evenly spaced.
[0011] In a preferred embodiment, the rolling column is a cylinder, and the diameter of the elongated hole is smaller than the diameter of the rolling column.
[0012] The clamping device for slender tubes with a large length-to-diameter ratio provided by this utility model has the following advantages:
[0013] 1. By setting clamping bolts, the rolling body can be squeezed and moved to clamp the pipe when the clamping nut is tightened. This makes it easier to clamp or limit the pipe and prevents the pipe from jumping during processing, which would affect the processing accuracy of the pipe.
[0014] 2. By setting guide posts, the guide posts can limit the movement of the limiting sleeve, allowing the limiting sleeve to move stably and preventing it from shifting during movement. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the main cross-sectional structure provided by an embodiment of the present invention;
[0017] Figure 2 A schematic diagram of the installation state of the rolling column provided for an embodiment of this utility model;
[0018] Figure 3 A schematic diagram of the rolling main body structure provided for an embodiment of this utility model;
[0019] In the diagram: 1. Clamping body; 2. Elastic clamping cone; 3. Rolling element retainer; 4. Clamping nut; 5. Needle roller bearing; 6. Limit sleeve; 7. Flange; 8. Guide post hole; 9. Guide post; 10. Nut; 11. Elongated hole; 12. Rolling column. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0021] Reference Figures 1-3 This utility model provides a technical solution: a clamping device for a slender tube with a large length-to-diameter ratio, including a clamping body 1. The right side of the clamping body 1 is connected to an elastic clamping cone 2. A rolling element retainer 3 passes through the elastic clamping cone 2. The rolling element retainer 3 has an elongated hole 11, and a rolling column 12 is provided in the elongated hole 11. A clamping nut 4 is threadedly connected to the outer surface of the clamping body 1. The left side of the clamping body 1 passes through a needle roller bearing 5. The other end of the needle roller bearing 5 is set in a limiting sleeve 6. After the clamping nut 4 is tightened, it can compress the elastic clamping cone 2. When the elastic clamping cone 2 is compressed, the rolling column 12 fits against the surface of the tube, which facilitates clamping or limiting the tube and prevents the tube from jumping during processing, thus affecting the processing accuracy of the tube. In addition, the installed needle roller bearing 5 has good wear resistance and is not worn.
[0022] Reference Figures 1-3 In a preferred embodiment, both the flange 7 and the limiting sleeve 6 are provided with matching guide pin holes 8. A guide pin 9 is provided in the guide pin hole 8. The guide pin 9 passes through the guide pin hole 8 of the flange 7 and the limiting sleeve 6, and the flange 7 and the limiting sleeve 6 are threadedly connected by a nut 10. There are 6 guide pin holes 8, which are equally spaced, so that the guide pin 9 can limit the limiting sleeve 6, allowing the limiting sleeve 6 to move stably and preventing deviation during movement. In addition, it is worth noting that there are multiple elongated holes 11, and the rolling column 12 is cylindrical. The diameter of the elongated hole 11 is smaller than the diameter of the rolling column 12, which allows the rolling column 12 to move in the elongated hole 11 when it is squeezed, thereby allowing the rolling column 12 to move and fit with the pipe.
[0023] Specifically, the working process or working principle of the clamping device for the long and thin tube with a large length-to-diameter ratio is as follows: When in use, after tightening the clamping nut 4, the clamping nut 4 will squeeze the elastic clamping cone 2. When the elastic clamping cone 2 is squeezed, the rolling column 12 will move inward, so that the rolling column 12 will fit against the surface of the tube, thereby facilitating the clamping or limiting of the tube and preventing the tube from jumping during processing, which would affect the processing accuracy of the tube.
Claims
1. Clamping device for large aspect ratio elongated tubes comprising a clamping body (1), characterized in that; The right side of the clamping body (1) is connected to the elastic clamping cone (2), the rolling element retainer (3) passes through the elastic clamping cone (2), the rolling element retainer (3) is provided with an elongated hole (11), the elongated hole (11) is provided with a rolling column (12), the clamping nut (4) is threadedly connected to the outer surface of the clamping body (1), the left side of the clamping body (1) passes through the needle roller bearing (5), and the other end of the needle roller bearing (5) is set in the limiting sleeve (6).
2. The clamping device for a slender tube with a large length-to-diameter ratio according to claim 1, characterized in that, The flange (7) and the limiting sleeve (6) are both provided with matching guide pin holes (8). The guide pin hole (8) is provided with a guide pin (9). The guide pin (9) passes through the guide pin holes (8) of the flange (7) and the limiting sleeve (6), and the flange (7) and the limiting sleeve (6) are threadedly connected by a nut (10).
3. The clamping device for a slender tube with a large length-to-diameter ratio according to claim 1, characterized in that, There are multiple elongated holes (11).
4. The clamping device for a slender tube with a large length-to-diameter ratio according to claim 2, characterized in that, There are 6 guide post holes (8), and they are evenly spaced.
5. The clamping device for a slender tube with a large length-to-diameter ratio according to claim 1, characterized in that, The rolling column (12) is a cylinder, and the diameter of the elongated hole (11) is smaller than the diameter of the rolling column (12).