Vehicle-mounted positioning terminal

Abstract

The utility model relates to a vehicle-mounted positioning terminal, which comprises a hollow sleeve with an opening on one side, a bottom shell is connected to the opening of the sleeve and detachably connected with the sleeve, a control board is arranged in the sleeve, a board end line is connected onto the bottom shell, a plurality of groups of sockets are arranged on the control board, and the sockets are arranged on the same side of the control board and face the opening of the sleeve. The control panel is fixed in the sleeve through the middle frame, and the sleeve is provided with multiple groups of jacks corresponding to the jacks. According to the vehicle-mounted positioning terminal, all the jacks of the control panel are formed in the side facing the opening of the sleeve, and the jacks are limited by the middle frame, so that information reading, startup and shutdown operation and SIM card replacement of the vehicle-mounted positioning terminal are facilitated, operation can be performed without pulling out the control panel, and operation is more convenient. The control panel slides into the sleeve through the sliding seat, the clamping groove is formed in the sleeve to facilitate drawing out and sliding in of the control panel, the protruding block is arranged outside the sliding seat to make contact with the inner wall of the sleeve, vibration transmitted to the control panel in the vehicle-mounted positioning terminal shaking process is reduced, and the service life of the vehicle-mounted positioning terminal is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of vehicle-mounted positioning terminals, and particularly relates to a vehicle-mounted positioning terminal. Background Art

[0002] The vehicle-mounted positioning terminal can provide real-time, all-weather and global positioning services for vehicles, and can realize functions such as vehicle positioning, anti-theft, anti-robbery, driving route planning, etc. With the development of the automotive industry, the demand for installing vehicle-mounted positioning terminals in vehicles is becoming more and more common. The vehicle-mounted positioning terminal is an intelligent terminal used inside the vehicle. It can perform services such as vehicle position query, electronic fence, speeding alarm, and trajectory playback, and can be used after installing the SIM card. When connecting the socket or replacing the SIM card of the existing vehicle-mounted positioning terminal, the control board needs to be pulled out for operation, which is rather inconvenient; at the same time, there is also a problem that after the control board is inserted, it directly contacts the outer shell, resulting in the vibration of the vehicle-mounted positioning terminal during the vehicle's shaking being directly transmitted to the control board, affecting the connection reliability of the control board and thus the service life of the vehicle-mounted positioning terminal.

[0003] Chinese Patent Publication No. CN219245773U relates to the technical field of locator devices. A control main board is arranged inside the locator main body. A control module, a positioning module, a light sensing module, and a wireless relay are arranged on the control main board. The positioning module, the light sensing module, and the wireless relay are electrically connected to the control module. The control module, the positioning module, and the wireless relay are arranged on the front side of the control main board, and the light sensing module is arranged on the back side of the control main board. The control module is electrically connected to the control main board. The positioning module includes a GPS module and an LBS module. By adopting a multiple positioning mode, positioning is carried out through satellite signals when the satellite signals are good, and positioning is carried out in cooperation with the data base station when the satellite signals are poor, improving the positioning effectiveness. At the same time, the vehicle circuit can be controlled to be turned on and off. When the vehicle is stolen, the vehicle is powered off through the control terminal, improving the anti-theft performance of the vehicle. Moreover, the locator itself has an anti-disassembly alarm function, effectively preventing the disassembly of the locator and ensuring its normal use. When replacing the SIM card of the vehicle-mounted positioning terminal recorded in this patent, the control board needs to be completely pulled out for operation, which is rather inconvenient.

[0004] Chinese Patent Publication No. CN220625326U provides a vehicle-mounted positioning terminal, which includes a housing, a plug disposed outside the housing, and a circuit module disposed inside the housing. The circuit module includes a circuit board, a communication module, a positioning module, and a control module. The communication module, the positioning module, and the control module are all disposed on the circuit board and electrically connected to the circuit board. The communication module and the positioning module are both electrically connected to the control module by electrical signals. The plug is electrically connected to the circuit board through a flexible cable. One end of the flexible cable is fixedly connected to the plug, and the other end of the flexible cable is fixedly connected to the housing. The vehicle-mounted positioning terminal provided by the present invention can be applicable to various vehicle models, has good compatibility, and a wide range of applications. In this patent, the control board is directly in contact with the housing, and the heat dissipation of the control board is poor. At the same time, when the vehicle-mounted positioning terminal shakes, the shaking is directly transmitted to the control board, affecting the service life of the control board and then affecting the service life of the vehicle-mounted positioning terminal. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that when operating the connection socket, power on / off, or replacing the SIM card of the existing vehicle-mounted positioning terminal, the control board needs to be taken out for operation, which is rather inconvenient. At the same time, there is also a problem that after the control board is inserted, it is directly in contact with the outer shell, resulting in the vibration of the vehicle-mounted positioning terminal being directly transmitted to the control board during the vehicle's shaking, affecting the connection of the control board and then affecting the service life of the vehicle-mounted positioning terminal. A vehicle-mounted positioning terminal is provided to address the above-mentioned defects of the prior art.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is:

[0007] Construct a vehicle-mounted positioning terminal, which includes a sleeve with an opening on one side and a hollow interior. A bottom shell is connected to the opening of the sleeve, and the bottom shell is detachably connected to the sleeve. A control board is disposed inside the sleeve. A board end wire is connected to the bottom shell. Multiple groups of sockets and power on / off keys are provided on the control board, and all the multiple groups of sockets and power on / off keys are on the same side of the control board and face the opening of the sleeve. The control board is fixed inside the sleeve through a middle frame, and multiple groups of jacks are provided on the sleeve corresponding to the sockets.

[0008] Preferably, the control board is connected to the sleeve through a sliding seat, and the sliding seat moves with the control board inside the sleeve to insert into the sleeve or be withdrawn from the sleeve.

[0009] Preferably, the sliding seat includes two opposite side walls, a front wall connecting the same ends of the two side walls, and a bottom wall connecting the bottoms of the two side walls. A support surface is provided on the side of the side wall away from the front wall, and a support platform is provided on the bottom wall. The control board is placed on the support surface and the support platform to be connected to the sliding seat.

[0010] Preferably, the support surface and the support platform are at the same vertical height, and there is a height difference between the support surface and the bottom wall support. A limiting block is provided between the opposite surfaces of the two side walls. There is a height difference between the lower end surface of the limiting block and the support surface. The limiting block limits the control board in the vertical direction. Fixed columns are provided on the support surface, and fixing holes are provided on the control board corresponding to the fixed columns.

[0011] Preferably, the side wall is provided with a hollowed-out groove, and convex blocks are provided outside the side wall and outside the front wall. The convex blocks are in contact with the inner wall of the sleeve.

[0012] Preferably, isolation columns are provided inside the front wall. The front end of the control board contacts the isolation columns so that there is a gap between the control board and the front wall. Card slots are provided on the left and right sides of the inner wall of the sleeve. The convex blocks provided on the side wall slide in the card slots, and the side of the control board is placed in the card slots.

[0013] Preferably, an inner step is provided inside the opening side of the sleeve. The middle frame is placed at the inner step. The control board is fixed in the sleeve by placing the middle frame at the inner step. The middle frame and the control board are connected by an anti-fooling structure.

[0014] Preferably, clamping openings are provided on both sides of the middle frame. First clamping blocks corresponding to the clamping openings are provided on the inner step. The first clamping blocks are placed at the clamping openings to connect the middle frame and the sleeve. A switch hole is provided on the control board facing the opening side of the sleeve. A toggle switch is provided on the control board corresponding to the switch hole. The distances from the switch hole to both sides of the middle frame are different. The anti-fooling structure for connecting the middle frame and the control board is formed by the switch hole and the toggle switch.

[0015] Preferably, an outer step is provided at the opening of the sleeve. A slot is provided on the bottom case. The opening side of the sleeve is inserted into the slot, and the outer wall of the outer step is in contact with the inner wall of the sleeve. A waterproof ring is provided between the sleeve and the bottom case. The sleeve and the bottom case are detachably connected by a snap structure.

[0016] Preferably, a SIM card is provided on the control board. A baffle is provided on the bottom case corresponding to the position of the SIM card. The baffle generates a blocking force on the SIM card. The snap structure includes ear cards provided on the left and right sides of the bottom case, and second clamping blocks provided on the left and right sides of the sleeve corresponding to the ear cards. Through holes are provided on the bottom case. Fixed plates are provided on the left and right sides of the through holes. An isolation plate is provided between the corresponding ends of the wire corresponding to the two fixed plates. A connecting groove is provided on the corresponding end of the wire corresponding to the through hole. The area of the isolation plate is larger than the area of the through hole, and the shape of the isolation plate is the same as the shape between the two fixed plates. Multiple anti-slip grooves are provided on the two outer sides of the sleeve. A concave surface is provided on one side of the sleeve.

[0017] The beneficial effects of the present utility model are as follows: By arranging all the sockets of the control board on the side facing the opening of the sleeve and restricting the sockets with the middle frame, it is convenient to read information, power on / off, and replace the SIM card of the vehicle-mounted positioning terminal. Operations can be carried out without taking out the control board, which is more convenient. At the same time, the control board slides into the sleeve through the sliding seat. A card slot is arranged in the sleeve to facilitate the extraction and sliding of the control board. And convex blocks are arranged on the outside of the sliding seat to contact the inner wall of the sleeve, reducing the vibration transmitted to the control board during the shaking of the vehicle-mounted positioning terminal and prolonging the service life of the vehicle-mounted positioning terminal. The control board is arranged on the support surface, and a gap is left between the support surface and the bottom wall, which can also improve the heat dissipation capacity of the control board. The middle frame and the control board are connected through an anti-fooling structure to prevent the reverse installation of the middle frame, with higher installation accuracy. The bottom shell and the sleeve are connected by snap connection after insertion, facilitating the installation and disassembly of the vehicle-mounted positioning terminal and also facilitating the maintenance of the vehicle-mounted positioning terminal. Description of the Drawings

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will further illustrate the present utility model in conjunction with the drawings and embodiments. The drawings in the following description are only partial embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings:

[0019] Figure 1 Schematic three-dimensional structure diagram of the vehicle-mounted positioning terminal according to a preferred embodiment of the present utility model;

[0020] Figure 2 Exploded structure diagram of the vehicle-mounted positioning terminal according to a preferred embodiment of the present utility model;

[0021] Figure 3 Axial side three-dimensional structure diagram of the sleeve according to a preferred embodiment of the present utility model;

[0022] Figure 4 Schematic sectional structure diagram of the vehicle-mounted positioning terminal according to a preferred embodiment of the present utility model;

[0023] Figure 5 Axial side three-dimensional structure diagram of the middle frame according to a preferred embodiment of the present utility model;

[0024] Figure 6 Another axial side three-dimensional structure diagram of the middle frame according to a preferred embodiment of the present utility model;

[0025] Figure 7 Axial side three-dimensional structure diagram of the bottom shell according to a preferred embodiment of the present utility model;

[0026] Figure 8 Axial side three-dimensional structure diagram of the board end wire according to a preferred embodiment of the present utility model;

[0027] Figure 9 Isometric three-dimensional structural schematic diagram of the sliding seat of the preferred embodiment of the present utility model;

[0028] Figure 10 Isometric three-dimensional structural schematic diagram of another side of the sliding seat of the preferred embodiment of the present utility model;

[0029] Figure 11 Isometric three-dimensional structural schematic diagram of yet another side of the sliding seat of the preferred embodiment of the present utility model;

[0030] Figure 12 Isometric three-dimensional structural schematic diagram of the control board of the preferred embodiment of the present utility model. Detailed implementation manners

[0031] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] A vehicle-mounted positioning terminal of the preferred embodiment of the present utility model; as Figures 1-2 and Figure 4 shown, it includes a sleeve 10 with an opening on one side and a hollow interior. A control board 60 is arranged inside the sleeve. The control board is connected to a sliding seat 70, and the sliding seat and the control board are combined to form a drawer type that can be pulled out or inserted on the opening side of the sleeve. A middle frame 50 is connected to the opening side of the sleeve. The control board is installed inside the sleeve through the middle frame, and a bottom shell 20 is connected to the opening. A waterproof ring 40 is arranged at the connection between the bottom shell and the sleeve, and the opening of the sleeve is sealed through the bottom shell. The other end of the bottom shell is connected to a board end wire 30, and the board end wire can be used as an antenna for signal transmission. Multiple groups of anti-slip grooves 100 are arranged on the left and right sides of the sleeve. The anti-slip grooves increase the friction of the sleeve, facilitating the pulling out and inserting of the control board from the sleeve. Moreover, a concave surface is arranged on the front side of the sleeve, and relevant information such as a product nameplate can be pasted at the concave surface, facilitating the viewing of relevant product information.

[0033] Specifically, as Figure 3 and Figure 12 shown, the bottom shell 10 is in a cuboid shape, and two groups of clamping posts 105 are respectively arranged on the left and right sides inside it. A clamping groove 106 is formed between the two groups of clamping posts. The control board slides in the clamping groove to prevent the clamping groove from moving. The side 602 of the control board is placed in the clamping groove, and the control board can only move along the opening direction in the clamping groove.

[0034] Furthermore, as Figure 3 , Figures 5-6 and Figure 12As shown in the figure, an inner step 103 is provided on the open side of the sleeve. The middle frame is placed at the inner step to fix the control board. Two sets of clamping posts 105 are also provided on both sides of the middle frame, and a clamping slot 106 is formed between the two sets of clamping posts. The clamping posts of the middle frame fix the control board on the side facing the opening. Three sets of second clamping blocks 104 are provided on the side of the inner step. The three sets of second clamping blocks are distributed in two groups. One set of second clamping blocks is placed in the middle of one side, and the other two sets of second clamping blocks are placed at both ends of the other side. Clamping openings 500 are provided on the left and right sides of the middle frame corresponding to the second clamping blocks. The middle frame can be connected to the sleeve by clamping the second clamping blocks into the clamping openings. Since the sleeve is made of plastic material, the clamping block and the sleeve can be separated by pressing the second clamping block in the middle part. On the side of the control board facing the middle frame, multiple sets of sockets 600 and toggle switches 601 are provided, which can be distributed on both sides of the control board. It should be noted that for the convenience of using the sockets, the sockets need to be placed on the side of the control board facing the middle frame, and multiple sets of jacks are provided on the middle frame corresponding to the sockets. The sockets can be connected to USB interfaces, insert SIM cards, etc., and SIM holes 502 are correspondingly provided, so that the SIM card can be inserted into the vehicle-mounted positioning terminal without removing the control board. At the same time, switch holes 502 are provided corresponding to the toggle switches 601. The switch holes can be set at non-middle positions, so that the toggle switches can be inserted into the switch holes, and an anti-fooling effect can be achieved, so that the middle frame can only be connected to the sleeve in a unique direction.

[0035] Further, as Figure 3 and Figures 7-8 shown, the bottom case 20 includes an inner plate 206 and an outer plate 205. A slot 203 is formed between the outer plate and the inner plate. The open side of the sleeve is inserted into the slot to be connected to the bottom case. An outer step 107 is also provided on the open side of the sleeve. After the inner wall of the outer plate of the bottom case contacts the outer wall of the outer step, they are connected and locked through a buckle structure. The buckle structure includes ear cards 200 provided on the left and right sides of the bottom case, and first clamping blocks 102 provided on the left and right sides of the sleeve corresponding to the ear cards. After the sleeve is inserted into the slot, the ear cards can be connected to the first clamping blocks to achieve locking. When disassembling, only one set of ear cards needs to be separated from the first clamping blocks to be disassembled, and the operation is more convenient. In order to prevent the inserted SIM card from popping out, a baffle 201 is provided on the bottom case corresponding to the SIM hole 502. When the bottom case is connected and locked with the sleeve, the baffle contacts the SIM card to prevent the SIM card from popping out. The SIM card can only be popped out when the bottom case is disassembled from the sleeve, ensuring stable communication. Through holes 202 are provided on the bottom case, and two sets of fixing plates 204 are provided on the inner wall of the bottom case. The two sets of fixing plates are placed on the left and right sides of the through holes. The board end wire 30 includes a connection groove 300 placed at the through hole. The end of the connection groove is connected through a partition plate 301. The area of the partition plate is larger than the area of the through hole, and the area and shape surrounded by the partition plate, the two sets of fixing plates and the inner wall of the bottom case are the same, improving the connection strength between the board end wire and the bottom case.

[0036] Further, as Figures 9-12As shown, the sliding seat 70 is formed by a set of front walls, left and right side walls 703 and a bottom wall. A support surface 701 is provided on the bottom wall, and the side walls also form the support surface 701. The control board is placed on the support surface. The side edge 602 of the control board is placed on the support surface of the side wall, and fixing posts 702 are provided on the support surface. Fixing posts can also be provided on the bottom wall. The control board is provided with fixing holes 603 corresponding to the fixing posts to realize the connection between the control board and the sliding seat. Two sets of limiting blocks 705 are provided on the opposite surfaces of the two side walls 703. The height of the limiting blocks in the vertical position is higher than that of the support surface, and the height difference between the limiting blocks and the support surface in the vertical position is basically the same as the thickness of the control board. The limiting blocks limit the control board in the vertical direction, and the side walls can limit the control board in the left and right directions. Since there is a gap between the support surface and the bottom wall, the control board does not contact the bottom wall, reducing the contact area between the control board and the sliding seat and improving the heat dissipation effect of the control board. At the same time, in order to facilitate the installation of the control board, a hollow groove 704 is provided between the side walls. When the control board is snapped into the sliding seat in the vertical direction, the side walls can be pushed to expand slightly outward. After the control board is snapped into the support surface, it can recover its deformation. In order to facilitate the sliding in, the upper end surface of the limiting block can be set to be arc-shaped. Convex blocks are provided on the outer sides of the side walls and front walls of the sliding seat. The convex blocks on the left and right sides can be placed at the card slots 106, facilitating the sliding of the sliding seat. At the same time, the convex blocks also reduce the vibration transmitted from the shaking of the vehicle-mounted positioning terminal to the control board, improving the service life and use stability of the control board. An isolation post 706 is also provided on the inner side of the front wall. The side of the isolation post contacts the front end of the control board, and can further reduce the vibration transmission during the insertion of the sliding seat and the control board into the sleeve.

[0037] During normal use, after obtaining the positioning information through the vehicle-mounted positioning terminal, it is stored by the SIM card and transmitted through the board end line 30. When information needs to be input to the control board, a set of card ears 200 are pried from the first card block 102 to separate the bottom case 20 from the sleeve 30. At this time, the vehicle-mounted positioning terminal is turned off by toggling the switch 600. The SIM card can be unplugged and replaced or information can be input to the control board through the socket 600, and then the toggling switch is turned on. Then the open side of the sleeve is inserted into the slot 203 and the bottom case is pressed until the two sets of card ears are snapped into the first card block, and the installation is completed. Then the vehicle-mounted positioning terminal can be used again, thus realizing the replacement of the SIM card and the reading and writing of information without unplugging the control board.

[0038] When the control board needs to be adjusted, after separating the bottom case from the sleeve in the aforementioned manner, and then pulling the middle frame 50, the control board 60 can be withdrawn from the sleeve together with the sliding seat 70. After the adjustment is completed, place the control board on the support surface 701, and connect the control board to the sliding seat through the side wall 703 and the limiting block 705. Insert the convex block 700 on the side wall of the sliding seat into the card slot, and continue to insert until the side of the control board is placed in the card slot until the sliding seat can no longer move forward. After aligning the switch hole with the direction of the toggle switch, snap the second card block into the card slot, and the connection between the middle frame and the sleeve is completed. Then, connect the bottom case and the sleeve in the same manner as before to restart the vehicle-mounted positioning terminal.

[0039] It should be understood that the present utility model is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present utility model, various changes or equivalent substitutions can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A vehicle-mounted positioning terminal, comprising a sleeve with an opening on one side and a hollow interior, a bottom shell is connected to the opening of the sleeve, the bottom shell is detachably connected to the sleeve, a control board is arranged inside the sleeve, and a board end wire is connected to the bottom shell, and is characterized in that: Multiple groups of sockets are provided on the control board, and the multiple groups of sockets are all located on the same side of the control board and face the opening of the sleeve. The control board is fixed in the sleeve through a middle frame, and multiple groups of jacks are provided on the sleeve corresponding to the sockets.

2. The vehicle-mounted positioning terminal according to claim 1, characterized in that: The control board is connected to the sleeve through a sliding seat, and the sliding seat moves with the control board in the sleeve to insert into the sleeve or be withdrawn from the sleeve.

3. The vehicle-mounted positioning terminal according to claim 2, characterized in that: The sliding seat includes two relatively arranged side walls, a front wall connecting the same ends of the two side walls, and a bottom wall connecting the bottoms of the two side walls. A support surface is provided on the side of the side wall away from the front wall, and a support platform is provided on the bottom wall. The control board is placed on the support surface and the support platform to be connected to the sliding seat.

4. The vehicle-mounted positioning terminal according to claim 3, characterized in that: The support surface and the support platform are at the same vertical height, and there is a height difference formed between the support surface and the support of the bottom wall. A limiting block is provided between the opposite surfaces of the two side walls, and there is a height difference between the lower end surface of the limiting block and the support surface. The limiting block limits the control board in the vertical direction. Fixing columns are provided on the support surface, and fixing holes are provided on the control board corresponding to the fixing columns.

5. The vehicle-mounted positioning terminal according to claim 3, wherein: Hollow grooves are provided on the side walls, bumps are provided outside the side walls, and bumps are provided outside the front wall. The bumps are in contact with the inner wall of the sleeve.

6. The vehicle-mounted positioning terminal according to claim 5, wherein: Isolation columns are provided inside the front wall. The front end of the control board contacts the isolation columns so that there is a gap between the control board and the front wall. Card slots are provided on the left and right sides of the inner wall of the sleeve. The bumps provided on the side walls slide in the card slots, and the side of the control board is placed in the card slots.

7. The vehicle-mounted positioning terminal according to any one of claims 1-6, characterized in that: An inner step is provided inside the opening side of the sleeve. The middle frame is placed at the inner step, and the control board is fixed in the sleeve by placing the middle frame at the inner step. The middle frame and the control board are connected through an anti-fooling structure.

8. The vehicle-mounted positioning terminal according to claim 7, characterized in that: Clamping openings are provided on both sides of the middle frame. First clamping blocks are provided on the inner step corresponding to the clamping openings. The first clamping blocks are placed at the clamping openings to connect the middle frame and the sleeve. A switch hole is provided on the control board facing the opening side of the sleeve. A toggle switch is provided on the control board corresponding to the switch hole. The distances from the switch hole to both sides of the middle frame are different, and an anti-fooling structure for connecting the middle frame and the control board is formed by the switch hole and the toggle switch.

9. The vehicle-mounted positioning terminal according to claim 1, wherein: An outer step is provided at the opening of the sleeve. A slot is provided on the bottom case. The opening side of the sleeve is inserted into the slot, and the outer wall of the outer step is in contact with the inner wall of the sleeve. A waterproof ring is provided between the sleeve and the bottom case. The sleeve and the bottom case are detachably connected through a snap structure.

10. The vehicle-mounted positioning terminal according to claim 9, wherein: A SIM card is provided on the control board. A baffle is provided on the bottom case corresponding to the position of the SIM card. The baffle generates a blocking force on the SIM card. The snap structure includes ear cards provided on the left and right sides of the bottom case, and second clamping blocks provided on the left and right sides of the sleeve corresponding to the ear cards. Through holes are provided on the bottom case. Fixed plates are provided on the left and right sides of the through holes. An isolation plate is provided between the two fixed plates corresponding to the board end wire. A connecting groove is provided on the board end wire corresponding to the through hole. The area of the isolation plate is larger than the area of the through hole, and the shape of the isolation plate is the same as the shape between the two fixed plates. Multiple anti-slip grooves are provided on the two outer sides of the sleeve. A concave surface is provided on one side of the sleeve.

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