Anti-falling radio frequency connector

Abstract

The invention relates to the technical field of radio frequency connectors, and discloses an anti-falling radio frequency connector which comprises a radio frequency connecting male head, a radio frequency connecting female head is inserted into the end of the radio frequency connecting male head, and a cable is arranged at the ends, away from each other, of the radio frequency connecting male head and the radio frequency connecting female head. The surfaces of the radio frequency connection male head and the radio frequency connection female head are respectively provided with a fixing part. The fixing part comprises a fixing ring, the surface of the fixing ring is fixedly connected with a limiting plate, and the end, away from the fixing ring, of the limiting plate is fixedly connected with a clamping frame. After the radio frequency connecting male head and the radio frequency connecting female head are inserted into the fixing ring, the clamping frame is inserted into the surface of the cable, the clamping frame is located at the end, close to each other, of the cable and the radio frequency connecting male head, the cable is protected through the clamping frame, and the situation that the connecting ends of the cable and the radio frequency connecting male head and the radio frequency connecting female head are in a bent state for a long time is avoided; and the connecting end of the cable and the radio frequency connecting male head is in a bent state and is easy to crack.

Description

Technical Field

[0001] The invention relates to the technical field of radio frequency connectors, in particular to an anti-falling radio frequency connector. Background Art

[0002] RF connector is an electronic component used for high-frequency signal transmission. It is usually installed on a cable or instrument as a component for electrically connecting or separating transmission lines. Its main function is to connect or disconnect two RF ports when necessary to achieve electrical connection, separation, or transfer of different types of transmission lines. Current RF connectors are generally connected by plugging, but the plugging end of the RF connector is relatively weak. When the RF connector is plugged in and out multiple times or the force is applied in the wrong direction, it is easy to cause its fit to decrease. The reduced fit will cause the RF connector to become loose after installation, affecting the stability of the RF connector for signal transmission. Summary of the invention

[0003] The object of the present invention is to provide a radio frequency connector that prevents falling off, so as to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is an anti-dropping radio frequency connector, comprising a radio frequency connection male head, an end of the radio frequency connection male head is plugged with a radio frequency connection female head, a cable is arranged at one end of the radio frequency connection male head and the radio frequency connection female head which are away from each other, and the surfaces of the radio frequency connection male head and the radio frequency connection female head are respectively provided with fixing components; The fixing component includes a fixing ring, a limiting plate is fixedly connected to the surface of the fixing ring, a clamping frame is fixedly connected to one end of the limiting plate away from the fixing ring, a slot is provided on the inner wall of the clamping frame, a plug-in block is inserted into the inner wall of the slot, an elastic telescopic rod is fixedly connected to the surface of the plug-in block, a circular groove is provided inside the fixing ring, a sealing ring is fixedly connected to the inner wall of the circular groove, a locking component is provided on the surface of the fixing ring, and a sealing component is provided at the end of the fixing ring.

[0005] Furthermore, there are two fixing rings, the sealing rings inside the two fixing rings are in contact with the surface of the RF connector male head and the RF connector female head respectively, and the inner wall of the card holder is in contact with the surface of the cable.

[0006] Furthermore, the number of the plug blocks is four, the four plug blocks are arranged into two groups, and the number of each group is two, the elastic telescopic rod is located at one end where the two plug blocks are close to each other, and the card holder is located at one end of the cable close to the RF connector.

[0007] Further, the locking component includes a round hole rod, the inner wall of the round hole rod is slidably connected with the round rod, the surface of the fixing ring is fixedly connected with a mounting plate, the end of the round hole rod away from the round rod is fixedly connected to the mounting plate, the end of the round rod away from the round hole rod is rotatably connected to the surface of the mounting plate, the surface of the round hole rod is provided with a plug hole, the surface of the round rod is provided with a groove, the inner wall of the groove is fixedly connected with an elastic rod, the end of the elastic rod away from the groove is fixedly connected with a stabilizing plate, the end of the stabilizing plate away from the elastic rod is hinged with an inclined plate, the top of the inclined plate is hinged with a locking block, the bottom of the locking block is fixedly connected with a telescopic rod, and the bottom of the telescopic rod is fixedly connected to the bottom of the inner wall of the groove.

[0008] Furthermore, the round hole rod and the round rod are located at one end of the two fixing rings close to each other, and one end of the round rod close to the mounting plate extends to the outer end of the round hole rod.

[0009] Furthermore, a plurality of inserting holes are provided on the top of the round hole rod, and two elastic rods are arranged inside the groove, and the two elastic rods are symmetrically arranged with the locking block as the center.

[0010] Furthermore, the surface of the stabilizing plate is slidably connected to the inner wall of the groove, the end of the inclined plate away from the stabilizing plate is arranged to be inclined upward, and the surface of the locking block contacts the inner wall of the insertion hole.

[0011] Furthermore, the sealing component comprises an extrusion ring, the surface of which is fixedly connected to the end of the fixing ring, an extrusion groove is formed at one end of the extrusion ring away from the fixing ring, and a rubber sleeve is inserted into the inner wall of the extrusion groove.

[0012] Furthermore, there are two extrusion rings, which are symmetrically arranged with the rubber sleeve as the center. The rubber sleeve is located at one end where the RF connection male head and the RF connection female head are close to each other, and the two extrusion rings are located at one end where the two fixing rings are close to each other.

[0013] The present invention has the following beneficial effects: After the RF male connector and the RF female connector are inserted into the interior of the fixing ring, the card holder is inserted into the surface of the cable, the card holder is located at one end of the cable and the RF male connector that are close to each other, the card holder is used to protect the cable to prevent the connecting ends of the cable and the RF male connector and the RF female connector from being in a bent state for a long time, and the connecting ends of the cable and the RF male connector are prone to cracking in a completely bent state, the insert block utilizes the elasticity of the elastic telescopic rod to be inserted into the interior of the slot and squeeze the inner wall of the slot to prevent the card holder and the cable from falling off.

[0014] When the RF connection male head of the present invention is plugged into the RF connection female head, the fixing ring will push the round hole rod and the round rod to move away from each other, and the round rod will be inserted into the inside of the round hole rod as the fixing ring moves. After the locking block is pushed into the inside of the groove, the round rod is twisted to rotate so that the locking block can contact the bottom of the inner wall of the round hole rod. At this time, the round rod can move into the inside of the round hole rod as the RF connection male head moves. After the RF connection male head and the RF connection female head are completely plugged in, the round rod is twisted to rotate inside the round hole rod. When the locking block corresponds to the inner wall of the jack, the elastic rod will push the stabilizing plate to move inside the groove. When the stabilizing plate moves Push the inclined plate to move, and the locking block will limit the top of the inclined plate. When the inclined plate moves toward the bottom of the locking block, the locking block will move upward and be inserted into the inside of the jack. The locking block is used to clamp the round rod inside the round hole rod to limit the fixing ring. The fixing ring squeezes and limits the RF connection male head through the clamping frame, thereby improving the stability of the RF connection male head and the RF connection female head after plugging in, and avoiding the RF connection male head and the RF connection female head from falling off after plugging in. The round rod is inserted into the inside of the round hole rod to protect the RF connection male head and the RF connection female head, and avoiding the connection ends of the RF connection male head and the RF connection female head from being broken due to stress.

[0015] When the RF connector male head and the RF connector female head are plugged in, the RF connector male head and the RF connector female head are inserted into the rubber sleeve, the end of the rubber sleeve contacts the inner wall of the extrusion groove, the extrusion groove is used to limit the rubber sleeve, and the fixing ring squeezes the rubber sleeve through the extrusion ring when moving, thereby improving the stability of the rubber sleeve after being sleeved on the surface of the RF connector male head. The rubber sleeve is used to protect the connection end of the RF connector male head and the RF connector female head. At the same time, the rubber sleeve can isolate dust from the outside of the connection end of the RF connector male head and the RF connector female head, thereby preventing dust from entering the interior of the RF connector male head.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the radio frequency connection male connector of the present invention; Figure 3 This is a schematic diagram of the connection between the RF male connector and the RF female connector of the present invention; Figure 4It is a schematic diagram of the overall structure of the fixing component of the present invention; Figure 5 It is another structural schematic diagram of the fixing component of the present invention; Figure 6 It is a schematic diagram of the overall structure of the locking component of the present invention; Figure 7 For the present invention Figure 6 A magnified schematic diagram of part A in FIG. Figure 8 It is a schematic diagram of the overall structure of the sealing component of the present invention.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows: In the figure: 1. RF connector male; 2. RF connector female; 3. Cable; 4. Fixing component; 5. Locking component; 6. Sealing component; 10. Fixing ring; 11. Limiting plate; 12. Card holder; 13. Circular ring groove; 14. Sealing ring; 15. Slot; 16. Insert block; 17. Elastic telescopic rod; 20. Round rod; 21. Round hole rod; 22. Insert hole; 23. Groove; 24. Locking block; 25. Stabilizing plate; 26. Elastic rod; 27. Telescopic rod; 28. Inclined plate; 29. ​​Mounting plate; 30. Extrusion ring; 31. Extrusion groove; 32. Rubber sleeve. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 8 As shown, the present invention is an anti-dropping RF connector, comprising a RF male connector 1, an RF female connector 2 is plugged into the end of the RF male connector 1, a cable 3 is provided at one end of the RF male connector 1 and the RF female connector 2 that are away from each other, and fixing components 4 are respectively provided on the surfaces of the RF male connector 1 and the RF female connector 2; The fixing component 4 includes a fixing ring 10, the surface of which is fixedly connected to a limiting plate 11, an end of the limiting plate 11 away from the fixing ring 10 is fixedly connected to a bracket 12, an inner wall of the bracket 12 is provided with a slot 15, an inner wall of the slot 15 is plugged with an insert block 16, an elastic telescopic rod 17 is fixedly connected to the surface of the insert block 16, an annular groove 13 is provided inside the fixing ring 10, a sealing ring 14 is fixedly connected to the inner wall of the annular groove 13, a locking component 5 is provided on the surface of the fixing ring 10, and a sealing component 6 is provided at the end of the fixing ring 10.

[0022] There are two fixing rings 10. After the RF connector male head 1 and the RF connector female head 2 are inserted into the fixing ring 10, the card holder 12 is inserted into the surface of the cable 3. The card holder 12 is located at the end where the cable 3 and the RF connector male head 1 are close to each other. The card holder 12 is used to protect the cable 3 to prevent the connecting ends of the cable 3 and the RF connector male head 1 and the RF connector female head 2 from being in a bent state for a long time. The connecting ends of the cable 3 and the RF connector male head 1 are in a completely bent state and are prone to cracking. The insert block 16 utilizes the elasticity of the elastic telescopic rod 17 to be inserted into the interior of the slot 15 and squeeze the inner wall of the slot 15 to prevent the card holder 12 and the cable 3 from falling off. The sealing rings 14 inside the two fixing rings 10 are in contact with the surfaces of the RF connector male head 1 and the RF connector female head 2 respectively, and the inner wall of the card holder 12 is in contact with the surface of the cable 3.

[0023] There are four plug-in blocks 16 , which are arranged in two groups, and each group has two plug-in blocks. The elastic telescopic rod 17 is located at one end where the two plug-in blocks 16 are close to each other, and the card holder 12 is located at one end of the cable 3 close to the RF connector 1 .

[0024] The locking component 5 includes a round hole rod 21, the inner wall of the round hole rod 21 is slidably connected with the round rod 20, the surface of the fixing ring 10 is fixedly connected with a mounting plate 29, the end of the round hole rod 21 away from the round rod 20 is fixedly connected to the mounting plate 29, the end of the round rod 20 away from the round hole rod 21 is rotatably connected to the surface of the mounting plate 29, the surface of the round hole rod 21 is provided with a plug hole 22, the surface of the round rod 20 is provided with a groove 23, the inner wall of the groove 23 is fixedly connected with an elastic rod 26, the end of the elastic rod 26 away from the groove 23 is fixedly connected with a stabilizing plate 25, the end of the stabilizing plate 25 away from the elastic rod 26 is hinged with an inclined plate 28, the top of the inclined plate 28 is hinged with a locking block 24, the bottom of the locking block 24 is fixedly connected with a telescopic rod 27, and the bottom of the telescopic rod 27 is fixedly connected to the bottom of the inner wall of the groove 23.

[0025] The round hole rod 21 and the round rod 20 are located at one end where the two fixing rings 10 are close to each other. When the RF connection male head 1 and the RF connection female head 2 of the present invention are plugged in, the fixing ring 10 will push the round hole rod 21 and the round rod 20 to move away from each other. The round rod 20 will be inserted into the inside of the round hole rod 21 as the fixing ring 10 moves. After the locking block 24 is pushed into the inside of the groove 23, the round rod 20 is twisted to rotate so that the locking block 24 can contact the bottom of the inner wall of the round hole rod 21. At this time, the round rod 20 can move toward the inside of the round hole rod 21 as the RF connection male head 1 moves. After the RF connection male head 1 and the RF connection female head 2 are plugged in, the end of the round rod 20 close to the mounting plate 29 extends to the outer end of the round hole rod 21.

[0026] A plurality of insertion holes 22 are provided at the top of the round hole rod 21. The round rod 20 is twisted to rotate inside the round hole rod 21. When the locking block 24 corresponds to the inner wall of the insertion hole 22, the elastic rod 26 will push the stabilizing plate 25 to move inside the groove 23. When the stabilizing plate 25 moves, it pushes the inclined plate 28 to move. The locking block 24 will limit the top of the inclined plate 28. When the inclined plate 28 moves toward the bottom of the locking block 24, the locking block 24 will move upward and be inserted into the inside of the insertion hole 22. The locking block 24 is used to clamp the round rod 20 inside the round hole rod 21 to limit the fixing ring 10. Two elastic rods 26 are arranged inside the groove 23, and the two elastic rods 26 are symmetrically arranged with the locking block 24 as the center.

[0027] The surface of the stabilizing plate 25 is slidably connected to the inner wall of the groove 23, and the fixing ring 10 squeezes and limits the RF connector male head 1 through the bracket 12, thereby improving the stability of the RF connector male head 1 and the RF connector female head 2 after being plugged in, and preventing the RF connector male head 1 and the RF connector female head 2 from falling off after being plugged in. The round rod 20 is inserted into the inside of the round hole rod 21 to protect the RF connector male head 1 and the RF connector female head 2. The end of the inclined plate 28 away from the stabilizing plate 25 is inclined upward, and the surface of the locking block 24 contacts the inner wall of the jack 22.

[0028] The sealing component 6 includes an extrusion ring 30 , the surface of which is fixedly connected to the end of the fixing ring 10 , an extrusion groove 31 is formed at one end of the extrusion ring 30 away from the fixing ring 10 , and a rubber sleeve 32 is inserted into the inner wall of the extrusion groove 31 .

[0029] There are two extrusion rings 30. When the RF connection male head 1 and the RF connection female head 2 are plugged in, the RF connection male head 1 of the present invention are inserted into the inside of the rubber sleeve 32. The end of the rubber sleeve 32 contacts the inner wall of the extrusion groove 31. The extrusion groove 31 is used to limit the rubber sleeve 32. When the fixed ring 10 moves, the rubber sleeve 32 is squeezed by the extrusion ring 30 to improve the stability of the rubber sleeve 32 after being sleeved on the surface of the RF connection male head 1. The rubber sleeve 32 is used to protect the connection end of the RF connection male head 1 and the RF connection female head 2. At the same time, the rubber sleeve 32 can isolate dust from the outside of the connection end of the RF connection male head 1 and the RF connection female head 2 to prevent dust from entering the inside of the RF connection male head 1. The two extrusion rings 30 are symmetrically arranged with the rubber sleeve 32 as the center. The rubber sleeve 32 is located at the end where the RF connection male head 1 and the RF connection female head 2 are close to each other, and the two extrusion rings 30 are located at the end where the two fixing rings 10 are close to each other.

[0030] When in use, after the RF connection male connector 1 and the RF connection female connector 2 are inserted into the interior of the fixing ring 10, the card holder 12 is inserted into the surface of the cable 3, and the card holder 12 is located at the end where the cable 3 and the RF connection male connector 1 are close to each other. The card holder 12 is used to protect the cable 3 to prevent the connection ends of the cable 3, the RF connection male connector 1 and the RF connection female connector 2 from being in a bent state for a long time. The connection ends of the cable 3 and the RF connection male connector 1 are in a completely bent state and are prone to cracking. The plug block 16 uses the elasticity of the elastic telescopic rod 17 to insert into the interior of the slot 15 and squeeze the inner wall of the slot 15 to prevent the card holder 12 and the cable 3 from falling off. The RF connection male connector 1 and the RF connection female connector When the head 2 is plugged in, the fixing ring 10 will push the round hole rod 21 and the round rod 20 to move away from each other, and the round rod 20 will be inserted into the inside of the round hole rod 21 as the fixing ring 10 moves. After pushing the locking block 24 into the inside of the groove 23, the round rod 20 is twisted to rotate so that the locking block 24 can contact the bottom of the inner wall of the round hole rod 21. At this time, the round rod 20 can move toward the inside of the round hole rod 21 as the RF connection male head 1 moves. After the RF connection male head 1 and the RF connection female head 2 are completely plugged in, the round rod 20 is twisted to rotate inside the round hole rod 21. When the locking block 24 corresponds to the inner wall of the jack 22, the elastic rod 26 will push the stabilizing plate 25 to move inside the groove 23. The stabilizing plate When moving, 25 pushes the inclined plate 28 to move, and the locking block 24 will limit the top of the inclined plate 28. When the inclined plate 28 moves toward the bottom of the locking block 24, the locking block 24 will move upward and be inserted into the inside of the jack 22. The locking block 24 is used to clamp the round rod 20 inside the round hole rod 21 to limit the fixing ring 10. The fixing ring 10 squeezes and limits the RF connection male head 1 through the bracket 12, thereby improving the stability of the RF connection male head 1 and the RF connection female head 2 after plugging, and preventing the RF connection male head 1 and the RF connection female head 2 from falling off after plugging. The round rod 20 is inserted into the inside of the round hole rod 21 to protect the RF connection male head 1 and the RF connection female head 2, thereby preventing the RF connection male head 1 and the RF connection female head 2 from falling off after plugging. The connecting end of the RF connector female connector 2 is broken by the force. When the RF connector male connector 1 is plugged into the RF connector female connector 2, it is inserted into the rubber sleeve 32. The end of the rubber sleeve 32 contacts the inner wall of the extrusion groove 31. The extrusion groove 31 is used to limit the rubber sleeve 32. The fixing ring 10 squeezes the rubber sleeve 32 through the extrusion ring 30 when moving, so as to improve the stability of the rubber sleeve 32 after being sleeved on the surface of the RF connector male connector 1. The rubber sleeve 32 is used to protect the connecting end of the RF connector male connector 1 and the RF connector female connector 2. At the same time, the rubber sleeve 32 can isolate dust from the outside of the connecting end of the RF connector male connector 1 and the RF connector female connector 2 to prevent dust from entering the inside of the RF connector male connector 1.

[0031] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An anti-dropout radio frequency connector, comprising a radio frequency connector male head (1), characterized in that: The end of the RF male connector (1) is plugged with the RF female connector (2), a cable (3) is provided at one end of the RF male connector (1) and the RF female connector (2) that are away from each other, and fixing components (4) are respectively provided on the surfaces of the RF male connector (1) and the RF female connector (2); The fixing component (4) comprises a fixing ring (10), a surface of the fixing ring (10) is fixedly connected to a limiting plate (11), one end of the limiting plate (11) away from the fixing ring (10) is fixedly connected to a bracket (12), an inner wall of the bracket (12) is provided with a slot (15), an inner wall of the slot (15) is plugged with an insert block (16), a surface of the insert block (16) is fixedly connected to an elastic telescopic rod (17), an inner ring groove (13) is provided inside the fixing ring (10), an inner wall of the circular groove (13) is fixedly connected to a sealing ring (14), a locking component (5) is provided on the surface of the fixing ring (10), and a sealing component (6) is provided at the end of the fixing ring (10).

2. The anti-dropping radio frequency connector according to claim 1, characterized in that: The number of the fixing rings (10) is two, and the sealing rings (14) inside the two fixing rings (10) are in contact with the surfaces of the RF connection male head (1) and the RF connection female head (2) respectively, and the inner wall of the card frame (12) is in contact with the surface of the cable (3).

3. The anti-dropping radio frequency connector according to claim 2, characterized in that: The number of the plug blocks (16) is four, and the four plug blocks (16) are arranged in two groups, and the number of each group is two, the elastic telescopic rod (17) is located at one end where the two plug blocks (16) are close to each other, and the card holder (12) is located at one end of the cable (3) close to the radio frequency connection male head (1).

4. The anti-dropping radio frequency connector according to claim 3, characterized in that: The locking component (5) comprises a round hole rod (21), the inner wall of the round hole rod (21) is slidably connected to a round rod (20), the surface of the fixing ring (10) is fixedly connected to a mounting plate (29), one end of the round hole rod (21) away from the round rod (20) is fixedly connected to the mounting plate (29), one end of the round rod (20) away from the round hole rod (21) is rotatably connected to the surface of the mounting plate (29), the surface of the round hole rod (21) is provided with a plug hole (22), and the surface of the round rod (20) is provided with a plug hole (22). A groove (23) is provided, the inner wall of the groove (23) is fixedly connected to an elastic rod (26), one end of the elastic rod (26) away from the groove (23) is fixedly connected to a stabilizing plate (25), one end of the stabilizing plate (25) away from the elastic rod (26) is hingedly connected to an inclined plate (28), the top of the inclined plate (28) is hingedly connected to a locking block (24), the bottom of the locking block (24) is fixedly connected to a telescopic rod (27), and the bottom of the telescopic rod (27) is fixedly connected to the bottom of the inner wall of the groove (23).

5. The anti-dropping radio frequency connector according to claim 4, characterized in that: The round hole rod (21) and the round rod (20) are located at one end of the two fixing rings (10) close to each other, and the end of the round rod (20) close to the mounting plate (29) extends to the outer end of the round hole rod (21).

6. The anti-dropping radio frequency connector according to claim 5, characterized in that: A plurality of insertion holes (22) are provided on the top of the round hole rod (21), and two elastic rods (26) are arranged inside the groove (23). The two elastic rods (26) are symmetrically arranged with the locking block (24) as the center.

7. The anti-dropping radio frequency connector according to claim 6, characterized in that: The surface of the stabilizing plate (25) is slidably connected to the inner wall of the groove (23); the end of the inclined plate (28) away from the stabilizing plate (25) is inclined upward; and the surface of the locking block (24) is in contact with the inner wall of the insertion hole (22).

8. The anti-dropping radio frequency connector according to claim 7, characterized in that: The sealing component (6) comprises an extrusion ring (30), the surface of the extrusion ring (30) being fixedly connected to the end of the fixing ring (10), an extrusion groove (31) being formed at one end of the extrusion ring (30) away from the fixing ring (10), and a rubber sleeve (32) being inserted into the inner wall of the extrusion groove (31).

9. The anti-dropping radio frequency connector according to claim 8, characterized in that: The number of the extrusion rings (30) is two, and the two extrusion rings (30) are symmetrically arranged with the rubber sleeve (32) as the center. The rubber sleeve (32) is located at one end where the RF connection male head (1) and the RF connection female head (2) are close to each other, and the two extrusion rings (30) are located at one end where the two fixing rings (10) are close to each other.

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