CN106922102B - Combination components of cooling unit - Google Patents

Abstract

A heat dissipation unit assembly element, correspondingly combining a screw locking element with a heat dissipation unit in a correspondingly pivotable manner, the heat dissipation unit assembly element comprising: the clamping device comprises a body, a blocking part, a first inner clamping part, a second inner clamping part and a first outer clamping part; the body is provided with a first part and a second part, a through hole is arranged along the axial direction of the body, and the blocking part is arranged on the outer edge of any one of the first part and the second part in a ring-shaped manner; the first inner clamping part is provided with a plurality of clamping sheets and is arranged corresponding to the blocking part; the second inner clamping part is provided with a plurality of stoppers which are selectively arranged on any one of the first part and the second part; the first outer clamping part is arranged at the outer edge of the other end opposite to the position where the blocking part is arranged; the present invention increases the convenience and stability of the screw locking device temporarily fixed on the heat dissipation unit, and prevents the screw locking device from being disassembled and dropped during transportation.

Description

Combination components of cooling unit

【Technical field】

A combination component of a heat dissipation unit, especially a combination component of a heat dissipation unit that is convenient for temporarily fixing the screw lock component that fixes the heat dissipation unit to the heat dissipation unit to prevent it from falling off during transportation.

【Background technique】

The internal electronic components of current electronic equipment will generate heat sources at the same time during operation, so a heat dissipation unit is needed to increase the efficiency of heat dissipation to avoid damage to the aforementioned electronic components due to excessive temperature, so the heat dissipation fin set or heat sink should be matched with at least A heat dissipation fan is set, and the heat dissipation unit is forced to dissipate heat through the heat dissipation fan to improve the overall heat dissipation performance; in addition, the generally used heat dissipation fins or radiators need to be firmly installed on the heat source through the support structure. On the electronic components, in order to effectively achieve the effect of heat conduction and heat dissipation.

Various heat dissipation units are usually designed in different ways to be interlocked or screwed together for assembly. For example, a heat sink frame or a fan frame is usually used to fix the heat sink first and then pass through between the cooling fan and the radiator. Screws and other screw locking elements are simultaneously inserted into the two heat dissipation units and the holes or internal threads opened in the frame will tighten the screw locks to achieve the purpose of assembling the two heat dissipation units together, or directly corresponding to one of the heat dissipation units and the heat source. .

However, the above-mentioned screw-lock components cannot be directly fixed together with each cooling unit at the same time. When assembly is required, the screw-lock components should be threaded into each heat-dissipating unit for screw-locking. Therefore, if the screw-lock components are threaded in advance When it is installed in the pre-opened holes of the heat dissipation unit, it cannot be fixed. When the heat dissipation unit is transported, the screw lock elements are prone to detachment from the heat dissipation unit. Causes short-circuit failure and damage to the electronic equipment substrate.

In addition, some people familiar with this technology provide a clamping structure to temporarily clamp the screw lock element to prevent the screw lock element from detaching from the heat dissipation unit, and the clamp structure needs to be specific to various heat dissipation units Different types are combined with other designs, so the commonality is not good. Even if the problem of the screw lock element falling off when the cooling unit is transported is solved, the poor commonality becomes another derived problem. As mentioned above, the known stent structure has the following disadvantages:

1. Cannot be used in common;

2. Easy to fall off during handling;

3. Consuming mold development costs.

【Content of invention】

In order to solve the above-mentioned shortcomings of the known technology, the main purpose of the present invention is to provide a heat dissipation unit combination component that can prevent the screw lock component from falling off during the transportation of the heat dissipation unit.

In order to achieve the above purpose, the present invention provides a heat dissipation unit combination element, correspondingly, a screw lock element is pivotally combined with a heat dissipation unit, and the heat dissipation unit combination element includes: a body with a first part and a second part, and the first and second parts are connected to each other, and the first and second parts are divided into two ends of the body, and the body is provided with a through hole along the axial direction, and the through hole runs through the first part of the body , two parts; a blocking part, the selection ring is set on the outer edge of any one of the first and second parts; a first inner card part, the first inner card part has a plurality of card making pieces, and the card making pieces are composed of The body has a through hole in which the inner wall extends radially toward the through hole, and the first inner locking part is arranged correspondingly to the aforementioned blocking part; a first outer locking part is correspondingly arranged at the other end opposite to where the blocking part is located The outer edge is formed by the outer edge of the main body protruding outward.

The clamping pieces have a first end surface and a second end surface respectively arranged on the upper side and the lower side of the locking piece, and any one of the first and second end surfaces is inclined.

There is also a second inner clamping part optionally located in any one of the aforementioned first and second parts, the second inner clamping part has a plurality of stoppers, and the stoppers extend radially from the inner wall of the through hole where the main body has a through hole As a result, the blocks have a first top surface and a second top surface respectively disposed at both ends of the block, and any one of the first and second top surfaces is inclined.

The stoppers are arranged axially in any form of continuous or discontinuous along the inner wall surface of the shaft hole of the body.

The body is provided with at least one first axial slot and a second axial slot at the opposite end of the blocking portion, which are arranged correspondingly. The first and second axial slots extend axially along the outer edge of the body. Formed and communicated with the through hole of the body, the first and second axial slots define a first hook body and a second hook body on the outer edge of the body.

The body is provided with at least one first axial slot, one second axial slot and one third axial slot at the opposite end of the blocking portion, which are arranged at a distance of 120 degrees (or other arbitrary angles) from each other, The first, second, and third axial slots are formed by extending axially along the outer edge of the body, and communicate with the through hole of the body. The first, second, and third axial slots define the outer edge of the body. The first hook body, a second hook body and a third hook body.

The body further has a third part and a second outer clamping part, the third part is connected to the first part, the second outer clamping part is arranged on the outer edge of the end of the third part, and the end of the third part The outer edge protrudes outwards, and the two outer clamping parts have at least one inclined tapered surface arranged on the top surface of the second outer clamping part.

The stoppers can also be arranged between the first and third parts at the same time, and the stoppers are arranged in any form of continuous or discontinuous along the axial direction of the inner wall surface of the shaft hole of the body.

The opposite end of the body on which the blocking portion is provided has at least one fifth axial slot and one sixth axial slot which are arranged correspondingly, and the fifth and sixth axial slots axially extend along the outer edge of the body Formed and connected to the through hole of the body, the fifth and sixth axial slots define a fifth hook body and a sixth hook body on the outer edge of the body.

The opposite end of the body where the blocking portion is provided has at least one fifth axial slot, one sixth axial slot and one seventh axial slot which are arranged at a distance of 120 degrees from each other, the fifth and sixth 7. The seven axial slots are formed by extending axially along the outer edge of the main body and communicate with the through hole of the main body. The fifth, sixth, and seventh axial slots define the outer edge of the main body as a fifth hook body And a sixth hook body and a seventh hook body.

Through the combination element of the heat dissipation unit of the present invention, it can be ensured that the screw lock element to be screwed and fixed to the heat dissipation unit will not fall off during the transportation of the heat dissipation unit, and the commonality between the combination element of the heat dissipation unit and each heat dissipation unit is greatly elastic. , It can also save the manufacturing cost of repeated development of molds.

【Description of drawings】

Fig. 1 is the perspective view of the first embodiment of the combined element of the cooling unit of the present invention;

Fig. 2 is a sectional view of the first embodiment of the heat dissipation unit assembly element of the present invention;

Fig. 3 is a cross-sectional view of the first embodiment of the heat dissipation unit assembly element of the present invention;

Fig. 4 is a perspective view of the second embodiment of the combined element of the cooling unit of the present invention;

Fig. 5 is a perspective view of the third embodiment of the combined element of the heat dissipation unit of the present invention;

Fig. 6 is a perspective view of the fourth embodiment of the combined element of the cooling unit of the present invention;

Fig. 7 is a cross-sectional view of the fifth embodiment of the combined element of the heat dissipation unit of the present invention;

Fig. 8 is a perspective view of the sixth embodiment of the combined element of the heat dissipation unit of the present invention;

Fig. 9 is a perspective view of the seventh embodiment of the combined element of the heat dissipation unit of the present invention;

Fig. 10 is a perspective view of the eighth embodiment of the heat dissipation unit assembly element of the present invention;

Fig. 11 is a perspective view of the ninth embodiment of the combined element of the heat dissipation unit of the present invention;

Figure 12 is a schematic diagram of the action of the present invention;

Figure 13 is a schematic diagram of the action of the present invention;

Figure 14 is a schematic diagram of the action of the present invention;

Fig. 15 is a schematic diagram of the operation of the present invention.

The components represented by each serial number in the accompanying drawings are:

Cooling unit combination element 1

Ontology 11

Part I 11a

Part II 11b

first axial slot 11c

Second axial slot 11d

The first hook body 11e

The second hook body 11f

The third axial slot 11g

The third hook body 11h

Part III 11i

Fifth axial slot 11j

Sixth axial slot 11k

The fifth hook body 11l

The sixth hook body 11m

Seventh axial slot 11n

The seventh hook body 11o

Block 12

The first inner card part 13

Card Producer 131

first end face 1311

second end face 1312

The second inner card part 14

Block 141

First Wild Card Division 15

First Side 151

Second side 152

Through hole 16

Second Wild Card Division 17

Inclined cone 17a

cooling unit 2

first side surface 21

second side surface 22

piercing 23

Screw lock element 3

head 31

Body 32

Class Slot 321

Bore 322

Internal thread 323

Electronic circuit substrate 4

Fixture 41

Stud 411

External thread 412

heat source42.

【Detailed ways】

The above-mentioned purpose of the present invention and its structural and functional characteristics will be described according to the embodiments of the accompanying drawings.

Please refer to Fig. 1, Fig. 2 and Fig. 3, which are perspective views and cross-sectional views of the first embodiment of the heat dissipation unit assembly element of the present invention. As shown in the figure, the heat dissipation unit assembly element 1 includes: a body 11, a retaining portion 12 , a first inner card part 13, a second inner card part 14, a first outer card part 15;

The body 11 has a first part 11a and a second part 11b, and the first and second parts 11a, 11b are connected to each other, and the first and second parts 11a, 11b are separated from the two ends of the body, the body 11 A through hole 16 is defined along the axial direction, and the through hole 16 passes through the first and second parts 11a, 11b of the body 11 .

The stopper 12 can be optionally arranged around the outer edge of any one of the aforementioned first and second parts 11a, 11b. and the stoppers 12 can be arranged in a continuous ring arrangement or a discontinuous ring arrangement. In this embodiment, a non-continuous arrangement of ring arrangements is used as an illustrative example, but it is not limited thereto.

The first inner locking part 13 has a plurality of locking pieces 131, and these locking pieces 131 are formed by extending radially toward the center of the through hole 16 from the inner wall of the body 11 where the through hole 16 is located, and the first inner locking part 13 is provided correspondingly to the above-mentioned blocking portion 12; the clamping pieces 131 have a first end surface 1311 and a second end surface 1312 respectively located on the upper and lower sides of the clamping piece 131, and the first and second end surfaces 1311, 1312 any one of them is inclined.

The second inner locking part 14 is selected to be located in any one of the aforementioned first and second parts 11a, 11b, and has a plurality of stoppers 141, and these stoppers 141 are formed from the inner wall of the through hole 16 of the body 11 to the through hole. The central radially extending protrusion is formed, and in this embodiment, the extension shape of the blocks 141 is defined by the inner wall of the through hole 16 of the body 11 (that is, the first part 11a extends to the inner side of the second part 11b) and the axis The way of extending is extended from the first part 11a of the body 11 to the direction of the second part 11b, and the stoppers 141 have a first top surface 1411 and a second top surface 1412, which are located at both ends of the stoppers 141 , and any one of the first and second top surfaces 1411, 1412 is inclined. Another embodiment of the second inner clamping portion 14 is shown in FIG. The end of the second part 11b.

The first outer clamping portion 15 is correspondingly arranged on the outer edge of the opposite end where the blocking portion 12 is located, and is formed by the outer edge of the main body 11 protruding outward. The blocking portion 12 of this embodiment is arranged on the first part The end outer edge of 11a is used as an illustrative embodiment, and the first outer clamping portion 15 is correspondingly arranged on the terminal outer edge of the second part 11b. As an illustrative embodiment, the first outer clamping portion 15 has a first surface 151 and a The second surface 152 is any one of an arc surface or an inclined surface. In this embodiment, an arc surface is used as an illustration but not limited thereto.

Please refer to Fig. 4, which is a perspective view of the second embodiment of the combined element of the cooling unit of the present invention. As shown in the figure, this embodiment has the same structural and technical features as the aforementioned first embodiment, so it will not be repeated here, but this embodiment The difference between this example and the aforementioned first embodiment is that the body 11 is provided with at least one first axial slot 11c and one second axial slot 11c at the opposite end (ie the second part 11b) where the blocking portion 12 (ie the first part 11a) is provided. Slots 11d are arranged correspondingly. The first and second axial slots 11c and 11d are formed by extending axially along the outer edge of the body 11 and communicate with the through hole 16 of the body 11. The first and second axial slots The grooves 11c, 11d define a first hooking body 11e and a second hooking body 11f on the outer edge of the main body 11 .

Please refer to Fig. 5, which is a perspective view of the third embodiment of the combined element of the cooling unit of the present invention. The difference between this example and the aforementioned first embodiment is that the body 11 is provided with at least one first axial slot 11c and one second axial slot 11c at the opposite end (ie the second part 11b) where the blocking portion 12 (ie the first part 11a) is provided. The slot 11d and a third axial slot 11g are arranged at a distance of 120 degrees or other angles. Formed and communicated with the through hole 16 of the body 11, the first, second, and third axial slots 11c, 11d, 11g define a first hook body 11e and a second hook body on the outer edge of the body 11 11f and a third hook body 11h.

Please refer to Fig. 6, which is a perspective view of the fourth embodiment of the combined element of the heat dissipation unit of the present invention. As shown in the figure, this embodiment has the same structural and technical features as the aforementioned second embodiment, so it will not be repeated here, but this embodiment The difference from the aforementioned second embodiment is that the body 11 is provided with at least one first axial slot 11c and one second axial slot 11c at the opposite end (ie the second part 11b) where the blocking portion 12 (ie the first part 11a) is provided. Groove 11d is provided correspondingly. The first and second axial slots 11c and 11d are formed by extending axially along the outer edge of the body 11 and communicate with the through hole 16 of the body 11. However, the first and second axial slots The grooves 11c, 11d do not completely axially penetrate through the second part 11b of the body 11, that is, the first outer clamping part 15 of the second part 11b is still completely arranged around the end of the second part 11b.

The number of axial slots provided in the aforementioned second, third, and fourth embodiments can also be four or more and is not limited thereto.

Please refer to Fig. 7, which is a perspective view of the fifth embodiment of the combined element of the heat dissipation unit of the present invention. As shown in the figure, this embodiment has the same structural and technical features as the aforementioned first embodiment, so it will not be repeated here, but this embodiment The difference from the aforementioned first embodiment is that the cross-section of any one of the first and second parts 11a and 11b of the body is non-circular. This embodiment uses the non-circular cross-section of the second part 11b as an illustration but does not It is not limited thereto, such as any one of ellipse, square, trapezoid, and polygon, and the cross-sectional shape corresponding to the position to be assembled is made to avoid relative radial rotation.

Please refer to Fig. 8, which is a perspective view of the sixth embodiment of the combined element of the heat dissipation unit of the present invention. As shown in the figure, this embodiment has the same structural and technical features as the aforementioned first embodiment, so it will not be repeated here, but this embodiment The difference between the example and the aforementioned first embodiment is that the body 11 further has a third part 11i and a second outer clamping portion 17, the third portion 11i is connected to the aforementioned first portion 11a, and the second outer clamping portion 17 Located on the outer edge of the end of the third part 11i, formed by protruding outward from the outer edge of the end of the third part 11i, the second outer clamping part 17 has at least one inclined tapered surface 17a provided on the second outer clamping part 17 top.

Please refer to Fig. 9, which is a cross-sectional view of the seventh embodiment of the combined element of the heat dissipation unit of the present invention. The difference between this example and the foregoing fourth embodiment is that the stoppers 141 can also be provided between the first and third parts 11a and 11i at the same time, and the stoppers 141 can be arranged along the inner wall surface of the shaft hole 16 of the main body 11. The axial direction is either continuous or non-continuous.

Please refer to Fig. 10, which is a perspective view and a cross-sectional view of the eighth embodiment of the heat dissipation unit combined element of the present invention. As shown in the figure, this embodiment has the same structural and technical features as the sixth embodiment, so it will not be repeated here, but The difference between this embodiment and the aforementioned sixth embodiment is that the body 11 is provided with at least one fifth axial slot 11j and one The sixth axial slot 11k is arranged correspondingly. The fifth and sixth axial slots 11j and 11k are formed by extending axially along the outer edge of the body 11 and communicate with the through hole 16 of the body 11. The fifth and sixth The axial slots 11j, 11k define a fifth hooking body 11l and a sixth hooking body 11m on the outer edge of the body 11 .

Please refer to Fig. 11, which is a perspective view of the ninth embodiment of the combined element of the heat dissipation unit of the present invention. As shown in the figure, this embodiment has the same structural and technical features as the aforementioned sixth embodiment, so it will not be repeated here, but this embodiment The difference between this example and the foregoing sixth embodiment is that the body 11 is provided with at least one fifth axial slot 11j and a sixth axial slot 11j at the opposite end (that is, the third part 11i) where the stopper 12 (that is, the first part 11a) is provided. The fifth, sixth, and seventh axial slots 11j, 11k, and 11n are formed by extending axially along the outer edge of the body 11. And communicate with the through hole 16 of the body 11, the fifth, sixth, and seventh axial slots 11j, 11k, 11n define the outer edge of the body 11 with a fifth hook body 11l and a sixth hook body 11m and - the seventh hook body 11o.

The number of axial slots provided in the aforementioned sixth, seventh, eighth, and ninth embodiments can also be four or more and is not limited thereto.

Please refer to Figure 12 and Figure 13, which are schematic diagrams of the action of the present invention, and refer to Figures 1 to 11, this embodiment has a heat dissipation unit 2, a heat dissipation unit fixing element 1, a screw lock element 3 and an electronic circuit a substrate 4 and a fixing frame 41 arranged on the electronic circuit substrate 4;

The heat dissipation unit 2 has a first side surface 21, a second side surface 22 and a plurality of perforations 23, and these perforations 23 are correspondingly arranged on the left, right or up and down and run through the first and second sides of the heat dissipation unit 2. Side surfaces 21,22.

The fixing bracket 41 is also provided with at least one stud 411 corresponding to the through holes 23 , and the outer edge of the stud 411 has a plurality of external threads 412 .

The screw lock element 3 has a head 31 and a body 32, the head 31 and the body 32 are connected to each other, and the outer diameter of the head 31 is greater than the outer diameter of the body 32, and the body 32 is more There is a first-order groove 321 surrounding the outer edge of the body 32 . The end of the body 32 has an inner hole 322 with a plurality of inner threads 323 .

The fixing frame 41 is correspondingly disposed near a heat source 42 disposed on the electronic circuit substrate 4 .

When assembling, firstly, the heat dissipation unit fixing elements 1 are correspondingly inserted in the through holes 23, and the retaining portion 12 of the body 11 is correspondingly attached to the first side surface 21 of the heat dissipation unit 2, and Make the first outer clamping portion 15 at the other end of the main body 11 correspondingly hook the second side surface 22 of the heat dissipation unit 2, and then pass the body portion 32 of the screw lock element 3 through the heat dissipation unit combination element 1 correspondingly. The through hole 16 of the main body 11 and the head 31 of the screw-locking element 3 correspond to the side where the blocking portion 12 of the body 11 and the first side surface 21 of the cooling unit 2 are attached to each other, and the blocking portion 12 In addition to having the function of making the body 11 and the first side surface 21 of the heat dissipation unit 2 adhere to each other, it can also be used as a gasket for the screw lock element 3 to prevent the screw lock element 3 from being assembled. loose.

The clamping pieces 131 of the first inner locking part 13 of the body 11 contact the stepped groove 321 of the body 32 of the screw lock element 3, and have an axial limiting effect. The second inner locking of the main body 11 The part 14 abuts against the outer edge of the position where the stepped groove 321 is provided on the body 32 of the screw lock element 3, preventing the second part 11b of the body 11 from retracting from the through hole 16 of the heat dissipation unit assembly body 1, And finally, the plurality of internal threads 323 arranged in the inner hole 322 at the end of the screw lock element 3 are screw-locked and combined with the outer thread 412 of the outer edge of the stud 411, so that the screw lock element 3 has not yet been screw-locked. Those who will not fall off when the cooling unit 2 is moved or other operations.

Please refer to Figure 14, which is a schematic diagram of the action of the present invention, and refer to Figures 1 to 11 again. This action embodiment is partly the same as the previous embodiment, so it will not be repeated here, but this embodiment is the same as the previous embodiment The difference lies in the structure of the fourth embodiment of the heat dissipation unit combination element used in this embodiment. The heat dissipation unit combination element 1 of this embodiment is a kind of both ends that can be combined with the screw lock element 3, that is It means that both ends of the heat dissipation unit combination element 1 can pass through the through holes 23 provided by the heat dissipation unit 2, which no longer limits the directionality, and both ends can be used.

When the shape of the through hole 23 provided by the heat dissipation unit 2 is non-circular, the cross-sectional shape of the heat dissipation unit assembly element 1 can be matched with a non-circular corresponding setting, thereby preventing the heat dissipation unit from being combined. The component 1 and the through hole 23 provided by the heat dissipation unit 2 rotate relative to each other in the radial direction (as shown in FIG. 15 ).

Claims (8)

1. A combination element of a heat dissipation unit, correspondingly combining a screw lock element with a heat dissipation unit in a pivotable manner, characterized in that, the combination element of the heat dissipation unit includes: A body has a first part and a second part, and the first and second parts are connected to each other, and the first and second parts are divided into two ends of the body, and the body is provided with a through hole in the axial direction, the through hole The hole runs through the first and second parts of the body; A blocking part, the selection ring is set on the outer edge of any one of the first and second parts; A first inner locking part, the first inner locking part has a plurality of locking pieces, and these locking pieces are formed by extending radially from the inner wall of the through hole of the body to the through hole, and the first inner locking part and the aforementioned The corresponding setting of the block; A first outer clamping portion, corresponding to the outer edge of the other end opposite to where the blocking portion is located, is formed by the outer edge of the main body protruding outward; A second inner locking part, which is selected to be located in any one of the first part and the second part, the second inner locking part has a plurality of stoppers, and the stoppers are from the inner wall of the through hole of the body to the central diameter Formed by extending to, the stoppers have a first top surface and a second top surface respectively arranged at both ends of the stoppers, and either one of the first top surface and the second top surface is inclined; The body further has a third part and a second outer clamping part, the third part is connected to the first part, the second outer clamping part is arranged on the outer edge of the end of the second part, and the third part The outer edge of the end is formed by protruding outwards, and the two outer clamping parts have at least one inclined tapered surface arranged on the top surface of the second outer clamping part. 2. The combination element of the heat dissipation unit according to claim 1, wherein the clamping piece has a first end surface and a second end surface respectively arranged on the upper and lower sides of the clamping piece, and the first end surface , either of the two end faces is inclined. 3 . The combination element of the heat dissipation unit according to claim 1 , characterized in that, the stopper is arranged in any state of continuous or discontinuous along the axial direction of the inner wall surface of the shaft hole of the body. 4 . 4. The combination element of the heat dissipation unit according to claim 1, characterized in that, the opposite end of the body to which the blocking portion is provided has at least one first axial slot and one second axial slot which are arranged correspondingly, the The first and second axial slots are formed by extending axially along the outer edge of the main body and communicate with the through hole of the main body. The first and second axial slots define a first hooking body on the outer edge of the main body and a second hook body. 5. The combination element of the heat dissipation unit according to claim 1, characterized in that, the opposite end of the body on which the blocking portion is provided has at least one first axial slot, a second axial slot and a third Axial slots are arranged at a distance of 120 degrees from each other. The first, second, and third axial slots are formed by extending axially along the outer edge of the body and communicate with the through hole of the body. The first, second, and third The axial groove defines a first buckle body, a second hook body and a third hook body on the outer edge of the main body. 6. The combination element of the heat dissipation unit according to claim 1, characterized in that, the stoppers can also be provided between the first and third parts at the same time, and the stoppers are arranged along the shaft hole of the body The axial direction of the inner wall is either continuous or discontinuous. 7. The combination element of the heat dissipation unit according to claim 1, characterized in that, the opposite end of the body to which the blocking portion is provided has at least one fifth axial slot and one sixth axial slot which are arranged correspondingly , the fifth and sixth axial slots are formed by axially extending along the outer edge of the body and communicate with the through hole of the body, the fifth and sixth axial slots define a fifth hook on the outer edge of the body body and a sixth hook body. 8. The combination element of the heat dissipation unit according to claim 1, characterized in that, the opposite end of the body to which the blocking portion is provided has at least one fifth axial slot, one sixth axial slot and one first axial slot. The seven axial slots are arranged at a distance of 120 degrees from each other. The fifth, sixth, and seventh axial slots are formed by extending axially along the outer edge of the body and communicate with the through hole of the body. The fifth, sixth, and Seven axial slots define a fifth hook body, a sixth hook body and a seventh hook body on the outer edge of the body.

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