Waterproof assembly of electric connector

Abstract

The utility model belongs to the technical field of electric connectors, and discloses a waterproof assembly of an electric connector, which is arranged at the rear end part of a pipe fitting of the electric connector, a first nut is screwed on the outer wall of the rear end of the pipe fitting, and an annular blocking edge is formed on the inner wall of the rear end of the first nut. A first assembling space is formed between the front end face of the annular blocking edge and the rear end face of the pipe fitting. The waterproof assembly comprises a waterproof ring and a waterproof ring cover cap which is sleeved outside the waterproof ring and is in close fit with the waterproof ring, and the waterproof ring cover cap and the front end part of the waterproof ring are pressed in the first assembly space from back to front; and the waterproof ring cover cap and the rear end part of the waterproof ring are arranged in a space enclosed by the annular blocking edge in a penetrating manner. The waterproof assembly of the electric connector can improve the sealing and waterproof performance of the electric connector.

Description

Technical Field

[0001] This utility model relates to the field of electrical connector technology, and in particular to a waterproof component for electrical connectors. Background Technology

[0002] The electrical connector mainly consists of a connector body, a tubing connected to the rear end of the connector body, and a waterproof component. The waterproof component is located between the rear end face of the tubing and the connecting nut. Its main function is to prevent external moisture from entering the tubing through the threaded connection at the rear end, thereby preventing moisture from entering the connector body along the tubing. This is crucial for ensuring the long-term stable operation of the connector.

[0003] Traditional waterproof components typically use a waterproof ring located between the rear end of the fitting and the connecting nut to block external moisture. However, this type of waterproof component is relatively flimsy and easily affected by usage time and environmental factors (such as temperature and humidity). Over time, the waterproof ring may lose its original waterproof performance due to aging, deformation, or displacement, allowing moisture to penetrate into the connector and potentially threatening its normal operation. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a waterproof component for electrical connectors that improves the waterproof performance of electrical connectors.

[0005] To solve the above-mentioned technical problems, the present invention provides a waterproof component for an electrical connector, which is disposed at the rear end of the tubing of the electrical connector. A first nut is screwed onto the outer wall of the rear end of the tubing, and an annular retaining flange is formed on the inner wall of the rear end of the first nut. A first assembly space is formed between the front end face of the annular retaining flange and the rear end face of the tubing. The waterproof component includes a waterproof ring and a waterproof ring cap that is fitted over and tightly fitted to the waterproof ring. The front end portions of the waterproof ring cap and the waterproof ring are pressed into the first assembly space from back to front, and the rear end portions of the waterproof ring cap and the waterproof ring pass through the space enclosed by the annular retaining flange.

[0006] Furthermore, the waterproof ring cap includes a first ring whose outer diameter is adapted to both the outer diameter of the rear end of the pipe fitting and the inner diameter of the first nut, and a second ring formed at the rear end of the first ring whose outer diameter is adapted to the space enclosed by the annular flange; the first ring, as the front end portion of the waterproof ring cap, is accommodated in the first assembly space, and the second ring, as the rear end portion of the waterproof ring cap, passes through the enclosed space; a second assembly space is formed between the inner wall of the first ring and the inner wall of the pipe fitting for assembling the front end portion of the waterproof ring, and the front end portion of the waterproof ring is tightly fitted within the second assembly space.

[0007] Furthermore, the waterproof ring cap also includes a plurality of insert arms that are circumferentially distributed around the front end of the first ring body, the plurality of insert arms extending forward from the front end of the first ring body; the rear outer wall of the pipe fitting is provided with a plurality of slots at the positions of the plurality of insert arms, and the plurality of insert arms are respectively inserted into the plurality of slots along the axial direction of the pipe fitting.

[0008] Furthermore, the front end face of the first ring abuts against the rear end face of the pipe fitting, the outer wall of the first ring is adapted to the inner wall of the first nut, and the rear end face of the first ring forms a first step portion, which abuts against the front end face of the annular retaining edge.

[0009] Furthermore, the first step portion is provided with a plurality of first protruding ribs at intervals around its circumference, and the plurality of first protruding ribs are radially distributed with the center of the first step portion as the center; the front end surface of the annular retaining edge is provided with a plurality of second protruding ribs corresponding to the plurality of first protruding ribs.

[0010] Furthermore, a first annular groove is formed on the inner wall of the first ring body, the first annular groove extending forward through the front end face of the first ring body, and the first annular groove also extending radially inward through the inner wall of the first ring body; a second annular groove is formed on the rear end inner wall of the pipe fitting, directly opposite the first annular groove, the second annular groove extending backward through the rear end face of the pipe fitting, and also extending radially inward through the rear end inner wall of the pipe fitting; the bottom wall of the first annular groove, the side wall of the first annular groove, the bottom wall of the second annular groove, and the side wall of the second annular groove together form a second assembly space with an inward opening, and the front end portion of the waterproof ring is pressed into the second assembly space.

[0011] Furthermore, the waterproof ring includes an annular body and a first protruding ring portion formed on the outer wall of the front end of the annular body and whose shape is adapted to the second assembly space. The first protruding ring portion serves as the front end portion of the waterproof ring and is tightly fitted within the second assembly space.

[0012] Furthermore, the waterproof ring also includes a second convex ring portion formed on the outer wall of the rear end of the annular body, the second convex ring portion being tightly fitted with the inner wall of the second annular body.

[0013] Furthermore, the rear end of the pipe fitting has a first pipe wall with a larger outer diameter and a second pipe wall with a smaller outer diameter located at the rear end of the first pipe wall, and the outer wall of the second pipe wall has a first external thread; the first nut is screwed onto the first external thread.

[0014] Furthermore, the outer wall of the first nut is provided with a plurality of clamping planes distributed around its circumference.

[0015] In summary, the waterproof component of this utility model for electrical connectors has the following advantages: The waterproof ring is positioned using a waterproof ring cap, preventing misalignment during assembly and ensuring a tight seal; compared to traditional thin-plate waterproof rings, the waterproof ring has a larger axial dimension and is fixed and positioned by the waterproof ring cap, making it less prone to deformation and displacement, thus solving the problems of poor waterproof performance and easy deformation of traditional thin-plate waterproof rings; the waterproof component is positioned between the rear end of the first nut and the rear end face of the pipe fitting, and is pressed between them during the tightening of the first nut, making operation extremely simple and quick, reducing assembly complexity and improving assembly efficiency; the screw-locking method of the first nut can effectively press the waterproof component against the rear end of the pipe fitting, and even if the waterproof ring shrinks subsequently, a margin can be provided between the front end face of the first nut and the first pipe wall, allowing the first nut to be tightened again to press the shrunken sealing ring, improving waterproof sealing efficiency. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a schematic diagram of the assembly of the waterproof component of the electrical connector and the rear end of the tubing of the electrical connector in one embodiment of this utility model.

[0018] Figure 2 yes Figure 1 Exploded view.

[0019] Figure 3 yes Figure 1 An exploded view from another perspective.

[0020] Figure 4 yes Figure 1 Mid-length sectional view.

[0021] Figure 5 yes Figure 4 The diagram below the waterproofing diagram is hidden.

[0022] Figure 6 yes Figure 5 The diagram shows the structure behind the waterproof ring cap.

[0023] The meanings of the labels in the attached diagram are as follows:

[0024] Elbow 200; First nut 210; First internal thread 211; Annular flange 212; Clamping plane 213; Second rib 212b; Enclosed space 212a; First pipe wall 220; Second pipe wall 230; Slot 232; First external thread 231; First assembly space 240;

[0025] Waterproof component 300; waterproof ring 310; annular body 311; first convex ring portion 312; second convex ring portion 313; waterproof ring cap 320; first ring body 321; first step portion 321a; first convex rib 321b; second ring body 322; insert arm 323; second assembly space 330; first annular groove 331; second annular groove 332. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0029] Please see Figures 1 to 6 In this article, combined with Figures 1 to 6 The structure shown is an illustrative example of the waterproof electrical connector assembly of this utility model, to more clearly demonstrate the various components and mating relationships of the waterproof electrical connector assembly. It should be understood that, although the following will... Figures 1 to 2 The illustrated waterproof electrical connector assembly is described in detail as an example, but is not intended to limit the scope of the waterproof electrical connector assembly of this utility model. Apart from the components that solve the essential technical problem of this utility model, the other components can be regarded as non-essential technical elements. These non-essential technical elements can be replaced by other technical elements with the same or similar functions or structures in other embodiments, or these non-essential technical elements may not be needed in other embodiments.

[0030] Please see Figure 1 , Figure 1This is a schematic diagram of the assembly of the waterproof component of the electrical connector and the rear end of the connector fitting 200. The front end of the fitting 200 can be assembled with the connector body (not shown) of the electrical connector using any known assembly method; however, this document only provides a detailed description of the waterproof component 300 at the rear end of the fitting 200. A first nut 210 is screwed onto the outer wall of the rear end of the fitting 200, and the waterproof component 300 prevents moisture from entering the interior of the fitting 200 from the screw connection.

[0031] Please see Figures 2 to 6 In the illustrated embodiment, the rear end of the pipe fitting 200 has a first pipe wall 220 with a larger outer diameter and a second pipe wall 230 with a smaller outer diameter located at the rear end of the first pipe wall 220. The outer wall of the second pipe wall 230 has a first external thread 231. The outer wall of the first nut 210 is provided with a plurality of clamping planes 213 distributed circumferentially around it. The inner wall of the first nut 210 is provided with a first internal thread 211 that mates with the first external thread 231. The first nut 210 is screwed to the first external thread 231 through its first internal thread 211. The rear inner wall of the first nut 210 has an annular flange 212, which is formed by the rear inner wall of the first nut 210 protruding radially inward. The inner diameter of the space 212a (i.e., the hollow portion) enclosed by the annular flange 212 is smaller than the inner diameter of the portion of the first nut 210 located in front of the annular flange 212. That is, the first nut 210 has two sections with different inner diameters. The inner diameter of the part located in front of the annular flange 212 is adapted to the outer diameter of the second pipe wall 230, and the inner diameter of the space 212a enclosed by the annular flange 212 is adapted to the inner diameter of the pipe fitting 200.

[0032] The axial length of the first nut 210 is greater than the axial length of the second pipe wall 230 of the pipe fitting 200. Therefore, when the first nut 210 is tightened onto the second pipe wall 230, a first assembly space 240 exists between the front end face of the annular flange 212 and the rear end face of the pipe fitting 200 (the rear end face of the second pipe wall 230). The axial dimension of the first assembly space 240 changes with the forward and backward movement of the first nut 210. That is, the first assembly space 240 is formed by the front end face of the annular flange 212, the rear end face of the pipe fitting 200, and a section of the inner wall of the first nut 210 located between them.

[0033] The waterproof component 300 includes a waterproof ring 310 and a waterproof ring cap 320 that is fitted over and tightly fitted to the waterproof ring 310. The front ends of the waterproof ring cap 320 and the waterproof ring 310 are pressed into the first assembly space 240 from back to front, and the rear ends of the waterproof ring cap 320 and the waterproof ring 310 pass through the space 212a enclosed by the annular flange 212.

[0034] Specifically, the waterproof cap 320 includes a first ring 321 whose outer diameter is adapted to both the outer diameter of the rear end of the pipe fitting 200 (the outer diameter of the second pipe wall 230) and the inner diameter of the first nut 210; a second ring 322 formed at the rear end of the first ring 321; and a plurality of insert arms 323 (e.g., two symmetrically arranged in this embodiment) circumferentially distributed around the first ring 321 at intervals at the front end of the first ring 321. The outer diameter of the second ring 322 is adapted to the inner diameter of the space 212a enclosed by the annular flange 212. The plurality of insert arms 323 extend forward from the front end of the first ring 321. Correspondingly, a plurality of slots 232 are provided on the rear end outer wall of the pipe fitting 200 (the outer wall of the second pipe wall 230) at the positions of the plurality of insert arms 323. The plurality of insert arms 323 are respectively inserted into the plurality of slots 232 along the axial direction of the pipe fitting 200. The configuration of the multiple inserts 323 and slots 232 ensures that the waterproof ring cap 320 is stably positioned on the rear end face of the pipe fitting 200 during the tightening of the first nut 210, preventing misalignment of the waterproof ring 310 and ensuring that the waterproof ring cap 320 and the waterproof ring 310 inside it remain coaxial with the pipe fitting 200 and the first nut 210, thereby improving the accuracy of positional assembly and ensuring waterproof performance.

[0035] The first ring 321, as the front end portion of the waterproof ring cap 320, is accommodated (pressed onto) in the first assembly space 240, and the second ring 322, as the rear end portion of the waterproof ring cap 320, passes through the enclosed space 212a.

[0036] A second assembly space 330 is formed between the inner wall of the first ring 321 and the inner wall of the pipe fitting 200 for assembling the front end portion of the waterproof ring 310. The front end portion of the waterproof ring 310 is tightly fitted within the second assembly space 330. The front end face of the first ring 321 abuts against the rear end face of the pipe fitting 200 (second pipe wall 230), the outer wall of the first ring 321 is adapted to the inner wall of the first nut 210, and the rear end face of the first ring 321 forms a first step portion 321a, which abuts against the front end face of the annular flange 212. The first step portion 321a is provided with a plurality of first protruding ribs 321b spaced around its circumference. These first protruding ribs 321b are radially distributed with the center of the first step portion 321a as the center. The length of each first protruding rib 321b is adapted to the radial dimension of the first step portion 321a, and the convex surface of each first protruding rib 321b is a backward-curved arc surface. Correspondingly, the front end face of the annular retaining edge 212 is provided with a plurality of second protruding ribs 212b corresponding to the plurality of first protruding ribs 321b. The length of each second protruding rib 212b is adapted to the radial dimension of the annular retaining edge 212, and the convex surface of each second protruding rib 212b is a forward-curved arc surface. When the first nut 210 is tightened, the first protruding ribs 321b and second protruding ribs 212b continuously misalign in the circumferential direction, generating sound and improving the user experience. Simultaneously, the first protruding ribs 321b and second protruding ribs 212b can increase structural strength.

[0037] The second assembly space 330 can be formed with the following structure: a first annular groove 331 is formed on the inner wall of the first annular body 321. The first annular groove 331 extends forward through the front end face of the first annular body 321 and also extends radially inward through the inner wall of the first annular body 321. The annular sidewall of the first annular groove 331 is inclined forward and outward, thereby making the included angle between the annular sidewall of the first annular groove 331 and the bottom wall of the first annular groove 331 an obtuse angle greater than 90 degrees. This configuration can increase the radial dimension of the second assembly space 330, which can increase the volume and surface area of ​​the front end portion of the waterproof ring 310 (the portion pressed and assembled in the second assembly space 330), increase the contact area between the waterproof ring 310 and the second assembly space 330, and improve the waterproof sealing performance.

[0038] The inner rear wall of the pipe fitting 200 has a second annular groove 332 directly opposite the first annular groove 331. The second annular groove 332 extends rearward through the rear end face of the pipe fitting 200 and also extends radially inward through the inner rear wall of the pipe fitting 200. The bottom wall of the first annular groove 331, the side wall of the first annular groove 331, the bottom wall of the second annular groove 332, and the side wall of the second annular groove 332 together form an inwardly opening second assembly space 330, and the front end of the waterproof ring 310 is pressed into the second assembly space 330. The side wall of the second annular groove 332 is inclined rearward and outward, thereby making the included angle between the side wall of the second annular groove 332 and the bottom wall of the second annular groove 332 an obtuse angle greater than 90 degrees. Similarly, this configuration can increase the radial dimension of the second assembly space 330, and the two ring sidewalls facing different directions form two contact surfaces, both of which are inclined. The advantage is that, while keeping the axial length of the first ring body 321 unchanged, the axial length of the first ring groove 331 and the second ring groove 332 is extended, the axial length of the second assembly space 330 is extended, the contact area between the waterproof ring 310 and the second assembly space 330 is increased, and the waterproof sealing performance is improved.

[0039] The outer wall of the waterproof ring 310 is tightly fitted to the inner wall of the waterproof ring cap 320. The waterproof ring 310 includes an annular body 311, a first protruding ring portion 312 formed on the front outer wall of the annular body 311 and whose shape is adapted to the second assembly space 330, and a second protruding ring portion 313 formed on the rear outer wall of the annular body 311. The outer wall of the waterproof ring 310, except for the first protruding ring portion 312, is tightly fitted to the inner wall of the waterproof ring cap 320, except for the first annular groove 331. The first protruding ring portion 312 serves as the front end portion of the waterproof ring 310 and is tightly fitted within the second assembly space 330. The outer surface shape of the first protruding ring portion 312 is adapted to the second assembly space 330, and the front end face of the first protruding ring portion 312 is located on the same plane as the front end face of the annular body 311. When the first protruding ring portion 312 is pressed into the second assembly space 330, the front end face of the first protruding ring portion 312 and the annular body 311 abuts against the bottom surface of the second annular groove 332, the outer peripheral surface of the first protruding ring portion 312 is tightly fitted to the annular sidewall of the first annular groove 331 and the second annular groove 332, and the rear end face of the first protruding ring portion 312 is flush with the bottom surface of the first annular groove 331.

[0040] Based on the above embodiments, when assembling the waterproof component 300 to the rear end of the pipe fitting 200, firstly, the waterproof ring cap 320 is pressed onto the outer periphery of the waterproof ring 310, with the rear end face of the waterproof ring 310 flush with the rear end face of the waterproof ring cap 320. The first convex ring of the waterproof ring 310 is located in the first annular groove 331, and the outer wall of the waterproof ring 310 is tightly fitted with the inner wall of the waterproof ring cap 320. Secondly, the insert arm 323 of the waterproof ring cap 320 is inserted into the slot 232 to coaxially position the waterproof ring cap 320 and the waterproof ring 310. The rear end face of the pipe fitting 200; then, the first nut 210 is screwed onto the outer wall of the rear end of the pipe fitting 200. During this process, as the first nut 210 gradually moves forward, the rear end of the waterproof ring cap 320 protrudes from the annular flange 212 and is flush with the rear end face of the first nut 210. The annular flange 212 of the first nut 210 gradually presses the waterproof ring cap 320 and the waterproof ring 310 forward, thereby making the waterproof ring 310 axially abut against the rear end face of the pipe fitting 200 and the annular flange 212 of the first nut 210, thus achieving a seal.

[0041] Based on the above embodiments, the waterproof component 300 for the electrical connector of this utility model has the following beneficial effects: The waterproof ring 310 is positioned by the waterproof ring cap 320, preventing the waterproof ring 310 from shifting during assembly and causing a loose seal; compared with the traditional thin-plate waterproof ring 310, the waterproof ring 310 has a larger axial dimension, and is fixed and positioned by the waterproof ring cap 320, making it less prone to deformation and displacement, thus solving the problems of poor waterproof performance and easy deformation of the traditional thin-plate waterproof ring 310; the waterproof component 300 is located at the first nut 21. The rear end of the 0 and the rear end face of the pipe fitting 200 are pressed together during the tightening of the first nut 210, making the operation extremely simple and quick, reducing assembly complexity and improving assembly efficiency. The screw-locking method of the first nut 210 can effectively press the waterproof component 300 against the rear end of the pipe fitting 200. Even if the waterproof ring 310 shrinks later, the shrinking sealing ring can be pressed again by setting a margin between the front end face of the first nut 210 and the first pipe wall 220, thereby improving the waterproof sealing efficiency.

[0042] The above embodiments only illustrate preferred implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A waterproof assembly for an electrical connector, disposed at the rear end of a tubular component of the electrical connector, wherein a first nut is screwed onto the outer wall of the rear end of the tubular component, characterized in that: The inner wall of the rear end of the first nut is formed with an annular retaining edge, and a first assembly space is formed between the front end face of the annular retaining edge and the rear end face of the pipe fitting; the waterproof component includes a waterproof ring and a waterproof ring cap that is fitted over the waterproof ring and tightly fitted thereto, the front end portion of the waterproof ring cap and the waterproof ring being pressed into the first assembly space from back to front, and the rear end portion of the waterproof ring cap and the waterproof ring passing through the space enclosed by the annular retaining edge.

2. The waterproof electrical connector assembly as described in claim 1, characterized in that: The waterproof ring cap includes a first ring whose outer diameter is adapted to both the outer diameter of the rear end of the pipe fitting and the inner diameter of the first nut, and a second ring formed at the rear end of the first ring whose outer diameter is adapted to the space enclosed by the annular flange; the first ring, as the front end portion of the waterproof ring cap, is accommodated in the first assembly space, and the second ring, as the rear end portion of the waterproof ring cap, passes through the enclosed space; a second assembly space is formed between the inner wall of the first ring and the inner wall of the pipe fitting for assembling the front end portion of the waterproof ring, and the front end portion of the waterproof ring is tightly fitted within the second assembly space.

3. The waterproof electrical connector assembly as described in claim 2, characterized in that: The waterproof ring cap also includes a plurality of insert arms that are circumferentially distributed around the front end of the first ring body, and the plurality of insert arms extend forward from the front end of the first ring body; the rear outer wall of the pipe fitting is provided with a plurality of slots at the positions of the plurality of insert arms, and the plurality of insert arms are respectively inserted into the plurality of slots along the axial direction of the pipe fitting.

4. The waterproof electrical connector assembly as described in claim 2, characterized in that: The front end face of the first ring abuts against the rear end face of the pipe fitting, the outer wall of the first ring is adapted to the inner wall of the first nut, and the rear end face of the first ring forms a first step portion, which abuts against the front end face of the annular retaining edge.

5. The waterproof electrical connector assembly as described in claim 4, characterized in that: The first step portion is provided with a plurality of first protruding ribs at intervals around its circumference, and the plurality of first protruding ribs are distributed radially with the center of the first step portion as the center; the front end surface of the annular retaining edge is provided with a plurality of second protruding ribs corresponding to the plurality of first protruding ribs.

6. The waterproof electrical connector assembly as described in claim 5, characterized in that: A first annular groove is formed on the inner wall of the first annular body. The first annular groove extends forward through the front end face of the first annular body and also extends radially inward through the inner wall of the first annular body. A second annular groove is formed on the rear end inner wall of the pipe fitting, which is directly opposite to the first annular groove. The second annular groove extends backward through the rear end face of the pipe fitting and also extends radially inward through the rear end inner wall of the pipe fitting. The bottom wall of the first annular groove, the side wall of the first annular groove, the bottom wall of the second annular groove, and the side wall of the second annular groove together form a second assembly space with an inward opening. The front end of the waterproof ring is pressed into the second assembly space.

7. The waterproof electrical connector assembly as described in claim 6, characterized in that: The waterproof ring includes an annular body and a first protruding ring portion formed on the outer wall of the front end of the annular body and whose shape is adapted to the second assembly space. The first protruding ring portion serves as the front end portion of the waterproof ring and is tightly fitted within the second assembly space.

8. The waterproof electrical connector assembly as described in claim 7, characterized in that: The waterproof ring also includes a second convex ring portion formed on the outer wall of the rear end of the annular body, the second convex ring portion being tightly fitted with the inner wall of the second annular body.

9. The waterproof electrical connector assembly as described in claim 1, characterized in that: The rear end of the pipe has a first pipe wall with a larger outer diameter and a second pipe wall with a smaller outer diameter located at the rear end of the first pipe wall. The outer wall of the second pipe wall has a first external thread. The first nut is screwed onto the first external thread.

10. The waterproof electrical connector assembly as claimed in claim 1, characterized in that: The outer wall of the first nut is provided with several clamping planes distributed around its circumference.

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