Unlocking structure of optical communication module and optical communication module

Abstract

The invention belongs to the technical field of optical communication equipment, and particularly relates to an unlocking structure of an optical communication module and the optical communication module.The unlocking structure of the optical communication module comprises a base, and a containing groove is formed in the upper end face of the base in the length direction of the base; the elastic piece is positioned in the accommodating groove; the pull ring comprises a handle and an unlocking push piece located on the side face of the base, and a limiting piece and a blocking piece are arranged in the unlocking push piece; when the pull ring is installed on the base, the blocking piece is located in the containing groove, one end of the elastic piece abuts against the side wall of the containing groove, the other end of the elastic piece abuts against the blocking piece, and the limiting piece is located on the side, away from the base, of the elastic piece. The invention aims to realize the mutual positioning of the base and the pull ring through the mutual matching of the elastic piece, the accommodating groove, the limiting piece and the blocking piece on the basis of realizing the reset function of the pull ring after being pulled by utilizing the mode that the unlocking push piece covers the two sides of the base and the blocking piece is positioned in the accommodating groove, and then the elastic piece is prevented from falling off by utilizing the limiting piece to cover the elastic piece.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical communication devices, and particularly relates to an unlocking structure for an optical communication module and an optical communication module. Background Art

[0002] The QSFP+SR optical communication module has the characteristic of "hot pluggable", that is, the module can be connected or disconnected from the device without turning off the power. Since the optical communication module often needs to be plugged and unplugged during use, it is usually required that the module is equipped with an unlocking device so that the module can be smoothly removed from the mounting cage on the device.

[0003] In order to better play the role of the hot pluggable performance of the optical communication module, it is necessary to continuously improve and optimize the unlocking structure for realizing the hot pluggable of the optoelectronic module to meet the requirements of quick unlocking, convenient operation, reliable and stable performance, etc.

[0004] The Chinese Utility Model Patent (Publication No.: CN205335531U) discloses a pull-ring type unlocking device for an optical communication module, in which a spring is received in a receiving groove of a base, and the top end is covered by an upper cover to form compression on a retaining piece of an unlocking piece, so as to realize the reciprocation of the pull ring.

[0005] However, in the actual installation process, before installing the upper cover, the spring is received in the receiving groove of the base, one end of which abuts against the side wall of the receiving groove, and the other end abuts against the retaining piece, while the upper part is completely open, and there is no effective positioning between the unlocking piece and the base. The semi-finished product after assembly is easily affected by external forces during subsequent transportation and production turnover, resulting in the slippage of parts. Summary of the Invention

[0006] The purpose of the present invention is to provide an unlocking structure for an optical communication module and an optical communication module. Through the mutual cooperation of an elastic member, a receiving groove, a limiting piece and a retaining piece, on the basis of realizing the reset function of the pull ring after being pulled by the elastic member abutting against the side wall and the retaining piece of the receiving groove, the mutual positioning of the base and the pull ring is realized by covering the two sides of the base with an unlocking push piece and the retaining piece being located in the receiving groove, and then the elastic member is covered by the limiting piece to prevent the elastic member from falling off.

[0007] To achieve the above technical purpose, the technical solution adopted by the present invention is as follows:

[0008] An unlocking structure for an optical communication module, comprising:

[0009] A base, on the upper end surface of which a receiving groove is opened along the length direction of the base;

[0010] An elastic member, which is located in the receiving groove;

[0011] Pull ring, the pull ring includes a handle and an unlocking push piece located on the side of the base, and a limiting piece and a blocking piece are arranged on the inner wall of the unlocking push piece;

[0012] When the pull ring is installed on the base, the blocking piece is located in the accommodating groove, one end of the elastic member abuts against the side wall of the accommodating groove near the handle, the other end abuts against the blocking piece, and the limiting piece is located on the side of the elastic member away from the base.

[0013] Further limited, when the pull ring is installed on the base, the limiting piece is located in the accommodating groove, and the length dimension of the limiting piece is smaller than the length dimension of the accommodating groove.

[0014] With such a structural design, by arranging the position of the limiting piece in the accommodating groove, there is no need to separately provide a mechanism for accommodating the limiting piece, the manufacturing is simple, and the practicability is relatively strong.

[0015] Further limited, the accommodating groove communicates with the outer side wall in the length direction of the base.

[0016] With such a structural design, through the communication between the accommodating groove and the side wall of the base, when installing, the blocking piece can be more conveniently placed in the accommodating groove, and the installation is more convenient.

[0017] Further limited, a secondary piece is also arranged on the inner wall of the unlocking push piece, the secondary piece is arranged coplanarly with the limiting piece, and a notch is left between the secondary piece and the limiting piece;

[0018] When the pull ring is installed on the base, the secondary piece is located in the accommodating groove;

[0019] A guiding groove corresponding to the secondary piece is provided on the base on the side of the accommodating groove away from the limiting piece.

[0020] With such a structural design, by the secondary piece blocking the free end of the elastic member away from the limiting piece, the risk of the elastic member disengaging from the accommodating groove can be further reduced;

[0021] At the same time, through the mutual cooperation of the secondary piece and the guiding groove, in addition to the guiding groove providing an avoidance for the movement of the secondary piece, it can also play a guiding role in the movement of the pull ring, reducing the movement freedom of the pull ring in the vertical direction when being pulled;

[0022] Furthermore, with the notch, a channel is provided for the installation of the elastic member to complete the installation of the elastic member.

[0023] Further limited, the blocking piece is fixedly connected to the unlocking push piece through the limiting piece.

[0024] With such a structural design, through the fixed connection between the blocking piece and the limiting piece, the freedom degree of the end of the elastic member abutting against the blocking piece from tilting upward is limited, further reducing the risk of the elastic member falling off, and the practicability is relatively strong.

[0025] Further defined, the elastic member is a spring.

[0026] With such a structural design, using a spring as the elastic member to achieve the reset function after the pull ring is pulled, the structure is simple, the cost is low, and the practicability is strong.

[0027] An optical communication module includes the unlocking structure of the above-mentioned optical communication module. An upper cover is installed on the base, and a limiting mechanism is provided between the upper cover and the pull ring;

[0028] The limiting mechanism is used to limit the maximum moving distance of the pull ring moving away from the base.

[0029] With such a structural design, the maximum moving distance of the pull ring is limited by the separately provided limiting mechanism, avoiding the problem of the elastic member failing due to excessive extrusion of the elastic member, and the practicability is strong.

[0030] Further defined, the limiting mechanism includes a first limiting wall and a second limiting wall;

[0031] First chutes are opened on both side walls of the upper cover;

[0032] Second chutes are opened on the side wall of the base at positions corresponding to the first chutes;

[0033] The first chutes and the second chutes enclose a slot group for accommodating the unlocking push piece;

[0034] A secondary slot is opened on the unlocking push piece, and the limiting piece is located in the secondary slot;

[0035] The side wall of the first chute close to the handle end is the first limiting wall;

[0036] The side wall of the secondary slot far from the handle end is the second limiting wall;

[0037] The first limiting wall is located on the movement path of the second limiting wall.

[0038] With such a structural design, the restriction of the pull ring is completed through the mutual cooperation of the first limiting wall and the second limiting wall. The structure is simple, the manufacturing is convenient, and the practicability is strong.

[0039] Further defined, an inclined block is fixedly provided on the upper end surface of the base far from the pull ring end, and the side of the inclined block close to the pull ring inclines away from the pull ring from top to bottom;

[0040] An inclined slot is opened at the end of the upper cover far from the pull ring, and the side of the inclined slot far from the pull ring inclines away from the pull ring from top to bottom;

[0041] An installation hole is opened on the upper cover, and a countersunk head bolt is passed through the installation hole;

[0042] The base is provided with threaded holes, and the countersunk head bolts are screwed into the threaded holes.

[0043] With such a structural design, through the mutual cooperation of the inclined block and the inclined groove, and the countersunk head bolts, the installation of the upper cover and the base is completed. The structure is simple, the installation is convenient, and the practicability is strong.

[0044] Further defined, a PCD board is detachably installed on the base;

[0045] On both sides of the PCD board on the base, semi-circular clamping columns are vertically provided, and semi-circular grooves are provided on both sides of the PCD board;

[0046] On both sides of the PCD board on the base, limiting convex blocks are also provided, and grooves are provided on the upper cover at positions corresponding to the limiting convex blocks;

[0047] On the opposite sides of the base and the upper cover, a plurality of top blocks are provided.

[0048] With such a structural design, through the mutual cooperation of the semi-circular clamping columns and the semi-circular grooves, the limiting convex blocks and the grooves, and the top blocks, the installation of the PCD board is completed. The structure is simple and the installation is convenient.

[0049] The invention adopting the above technical solution has the following advantages:

[0050] Through the mutual cooperation of the elastic member, the accommodating groove, the limiting piece and the retaining piece, on the basis of realizing the reset function of the pull ring after being pulled by the elastic member against the side wall of the accommodating groove and the top of the retaining piece, by covering the two sides of the base with the unlocking push piece and the way that the retaining piece is located in the accommodating groove, the mutual positioning of the base and the pull ring is realized, and then by covering the elastic member with the limiting piece, the elastic member is prevented from falling off; BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention can be further illustrated by the non-limiting embodiments given in the drawings;

[0052] Figure 1 It is a schematic structural diagram of an unlocking structure of an optical communication module and an embodiment of the optical communication module of the present invention;

[0053] Figure 2 is Figure 1 an enlarged structural diagram of part A in;

[0054] Figure 3 It is an exploded structural diagram of an unlocking structure of an optical communication module and an embodiment of the optical communication module of the present invention;

[0055] Figure 4 is Figure 3 an enlarged structural diagram of part B in;

[0056] Figure 5Schematic cross-sectional structure diagram of an unlocking structure of an optical communication module and an embodiment of an optical communication module according to the present invention;

[0057] Figure 6 For Figure 5 Enlarged structure diagram at position C in

[0058] Figure 7 Schematic installation structure diagram of the base, elastic member and pull ring parts in an unlocking structure of an optical communication module and an embodiment of an optical communication module according to the present invention;

[0059] Figure 8 For Figure 7 Enlarged structure diagram at position D in

[0060] Main component symbols are explained as follows:

[0061] Base 1, receiving groove 11, guiding groove 12, second sliding groove 13, inclined block 14, threaded hole 15,

[0062] Semicircular clamping post 16, limiting convex block 161, top block 162,

[0063] Elastic member 2,

[0064] Pull ring 3, handle 30, unlocking push piece 31, limiting piece 32, secondary groove 320, retaining piece 33, secondary piece 34,

[0065] Countersunk head bolt 4,

[0066] Upper cover 5, first limiting wall 50, first sliding groove 51, inclined groove 52, mounting hole 53,

[0067] PCD board 6, semicircular groove 60. Detailed implementation manners

[0068] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that in the description of the drawings or the specification, similar or identical parts are denoted by the same reference numerals, and the implementation manners not shown or described in the drawings are those known to those of ordinary skill in the art. In addition, the directional terms mentioned in the embodiments, such as "upper", "lower", "top", "bottom", "left", "right", "front", "rear", etc., are only references to the directions of the drawings and are not used to limit the protection scope of the present invention.

[0069] As Figures 1 to 8 shown, an unlocking structure of an optical communication module according to the present invention includes:

[0070] Base 1, on the upper end surface of the base 1, a receiving groove 11 is opened along the length direction of the base 1;

[0071] Elastic member 2, the elastic member 2 is located in the receiving groove 11;

[0072] Pull ring 3, the pull ring 3 includes a handle 30 and an unlocking push piece 31 located on the side of the base 1. A limiting piece 32 and a stop piece 33 are provided on the inner wall of the unlocking push piece 31;

[0073] When the pull ring 3 is installed on the base 1, the stop piece 33 is located in the receiving groove 11. One end of the elastic member 2 abuts against the side wall of the receiving groove 11 near the handle 30, and the other end abuts against the stop piece 33. The limiting piece 32 is located on the side of the elastic member 2 away from the base 1.

[0074] When the pull ring 3 is installed on the base 1, the limiting piece 32 is located in the receiving groove 11, and the length dimension of the limiting piece 32 is smaller than the length dimension of the receiving groove 11.

[0075] Actually, according to the actual situation, a receiving mechanism for accommodating the limiting piece 32 can also be provided by opening a groove along the length direction of the base 1 on the side wall in the width direction of the base 1. In this embodiment, by setting the position of the limiting piece 32 in the receiving groove 11, there is no need to separately provide a mechanism for accommodating the limiting piece 32, which is simple to manufacture and has strong practicability.

[0076] The receiving groove 11 communicates with the outer side wall of the base 1 in the length direction.

[0077] Actually, according to the actual situation, the side wall of the receiving groove 11 and the base 1 in the width direction can also be closed. In this embodiment, through the communication between the receiving groove 11 and the side wall of the base 1, the stop piece 33 can be more conveniently placed in the receiving groove 11 during installation, making the installation more convenient.

[0078] A secondary piece 34 is further provided on the inner wall of the unlocking push piece 31. The secondary piece 34 is coplanar with the limiting piece 32, and there is a gap between the secondary piece 34 and the limiting piece 32;

[0079] When the pull ring 3 is installed on the base 1, the secondary piece 34 is located in the receiving groove 11;

[0080] The base 1 is provided with a guiding groove 12 corresponding to the secondary piece 34 on the side away from the limiting piece 32 of the receiving groove 11.

[0081] By blocking the free end of the elastic member 2 away from the limiting piece 32 with the secondary piece 34, the risk of the elastic member 2 disengaging from the receiving groove 11 can be further reduced;

[0082] At the same time, through the mutual cooperation of the secondary piece 34 and the guiding groove 12, in addition to using the guiding groove 12 to avoid the movement of the secondary piece 34, it can also play a guiding role in the movement of the pull ring 3, reducing the degree of freedom of movement of the pull ring 3 in the vertical direction when it is pulled;

[0083] Furthermore, the gap provides a channel for the installation of the elastic member 2 to complete the installation of the elastic member 2.

[0084] The blocking piece 33 is fixedly connected to the unlocking push piece 31 via the limiting piece 32 .

[0085] In fact, according to actual conditions, the blocking piece 33 can be directly fixedly connected with the unlocking push piece 31. In this embodiment, the freedom of the end of the elastic member 2 resting on the blocking piece 33 to tilt upward is limited by the fixed connection between the blocking piece 33 and the limiting piece 32, thereby further reducing the risk of the elastic member 2 falling off, and having strong practicality.

[0086] The elastic member 2 is a spring.

[0087] In fact, according to actual conditions, an elastic rubber column can be selected as the elastic member 2. In this embodiment, a spring is used as the elastic member 2 to achieve the reset function after the pull ring 3 is pulled. It has a simple structure, low cost and strong practicality.

[0088] An optical communication module, comprising the unlocking structure of the optical communication module described above, wherein an upper cover 5 is installed on a base 1, and a limiting mechanism is provided between the upper cover 5 and the pull ring 3;

[0089] The limiting mechanism is used to limit the maximum moving distance of the pull ring 3 moving in a direction away from the base 1 .

[0090] The maximum moving distance of the pull ring 3 is limited by a separately arranged limiting mechanism, thereby avoiding the problem of failure of the elastic member 2 caused by excessive squeezing of the elastic member 2, and the practicability is strong.

[0091] The limiting mechanism includes a first limiting wall 50 and a second limiting wall;

[0092] Both side walls of the upper cover 5 are provided with first sliding grooves 51;

[0093] The side wall of the base 1 is provided with a second slide groove 13 at a position corresponding to the first slide groove 51;

[0094] The first slide groove 51 and the second slide groove 13 together form a groove group for accommodating the unlocking push piece 31;

[0095] The unlocking push piece 31 is provided with a secondary groove 320, and the limiting piece 32 is located in the secondary groove 320;

[0096] The side wall of the first sliding groove 51 close to one end of the handle 30 is a first limiting wall 50;

[0097] The side wall of the auxiliary groove 320 away from one end of the handle 30 is a second limiting wall;

[0098] The first limiting wall 50 is located on the moving path of the second limiting wall.

[0099] Actually, according to the actual situation, it is also possible to select, for example, to additionally provide a limit block on the top of the unlocking push piece 31 and provide a limit groove on the upper cover 5, and install the limit block slidably in the limit groove to limit the maximum moving position. In this embodiment, through the mutual cooperation of the first limit wall 50 and the second limit wall, the restriction on the pull ring 3 is completed, with a simple structure, convenient manufacturing and strong practicability.

[0100] On the upper end surface of one end of the base 1 far from the pull ring 3, an inclined block 14 is fixedly provided, and the side of the inclined block 14 close to the pull ring 3 inclines away from the pull ring 3 from top to bottom;

[0101] On one end of the upper cover 5 far from the pull ring 3, an inclined groove 52 is provided, and the side of the inclined groove 52 far from the pull ring 3 inclines away from the pull ring 3 from top to bottom;

[0102] On the upper cover 5, a mounting hole 53 is provided, and a countersunk head bolt 4 is passed through the mounting hole 53;

[0103] On the base 1, a threaded hole 15 is provided, and the countersunk head bolt 4 is screwed into the threaded hole 15.

[0104] Actually, according to the actual situation, it is also possible to directly select multiple bolts to install the upper cover 5 and the base 1. In this embodiment, through the mutual cooperation of the inclined block 14 and the inclined groove 52 and the countersunk head bolt 4, the installation of the upper cover 5 and the base 1 is completed, with a simple structure, convenient installation and strong practicability.

[0105] A PCD board 6 is detachably installed on the base 1;

[0106] On both sides of the PCD board 6 on the base 1, semi-circular clamping columns 16 are vertically provided, and semi-circular grooves 60 are provided on both sides of the PCD board 6;

[0107] On both sides of the PCD board 6 on the base 1, limit convex blocks 161 are also provided, and grooves are provided on the upper cover 5 at positions corresponding to the limit convex blocks 161;

[0108] On the opposite sides of the base 1 and the upper cover 5, a number of top blocks 162 are provided.

[0109] Actually, according to the actual situation, it is also possible to directly select multiple bolts to screw the PCD board 6 onto the base 1. In this embodiment, through the mutual cooperation of the semi-circular clamping columns 16 and the semi-circular grooves 60, the limit convex blocks 161 and the grooves, and the top blocks 162, the installation of the PCD board 6 is completed, with a simple structure and convenient installation.

[0110] In this embodiment, during installation, the unlocking push piece 31 of the pull ring 3 is pulled to both sides and pushed in from the left side or the lower side of the base 1 until the unlocking push piece 31 enters the second sliding groove 13, and the limiting piece 32, the blocking piece 33 and the auxiliary piece 34 all enter the accommodating groove 11, and the limiting piece 32 abuts against the side wall of the accommodating groove 11 on the side far from the handle 30;

[0111] Insert the elastic member 2 (spring) through the notch between the limiting piece 32 and the auxiliary piece 34, so that one end of the elastic member 2 abuts against the retaining piece 33, and the other end abuts against the side wall of the accommodating groove 11 near the handle 30 end, and the limiting piece 32 and the auxiliary piece 34 shield the upper part of the elastic member 2 (as shown in Figure 7 and Figure 8 shown);

[0112] Place the PCD board 6 on the base 1, support the PCD board 6 by the top block 162 on the base 1, and snap the semi-circular clamping posts 16 of the base 1 into the semi-circular grooves 60 on both sides of the PCD board 6, and then limit the freedom of movement of the PCD board 6 in the front and back directions by the limiting bumps 161;

[0113] Snap the inclined groove 52 of the upper cover 5 into the inclined block 14 of the base 1, and make the upper cover 5 fit the base 1. At this time, the unlocking push piece 31 is located in the first sliding groove 51 of the upper cover 5. Then, pass the countersunk head bolt 4 through the mounting hole 53 of the upper cover 5 and screw it into the threaded hole 15 of the base 1;

[0114] During use, pull the handle 30 of the pull ring 3 in a direction away from the base 1, squeeze the elastic member 2 through the retaining piece 33, overcome the prestress of the elastic member 2, drive the unlocking push piece 31 to slide in the groove group formed by the first sliding groove 51 and the second sliding groove 13. During the sliding process, the auxiliary piece 34 slides from the accommodating groove 11 into the guiding groove 12 until the second limiting wall of the pull ring 3 contacts the first limiting wall 50 of the upper cover 5;

[0115] After use, release the pulling of the pull ring 3, and the pull ring 3 resets under the action of the elastic member 2.

[0116] The unlocking structure of an optical communication module and the optical communication module provided by the present invention are introduced in detail above. The description of the specific embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An unlocking structure of an optical communication module, characterized in that: include: A base (1), wherein an upper end surface of the base (1) is provided with a receiving groove (11) along the length direction of the base (1); An elastic member (2), the elastic member (2) being located in the accommodating groove (11); A pull ring (3), the pull ring (3) comprising a handle (30) and an unlocking push piece (31) located on a side of the base (1), the inner wall of the unlocking push piece (31) being provided with a limiting piece (32) and a blocking piece (33); When the pull ring (3) is mounted on the base (1), the blocking piece (33) is located in the receiving groove (11), one end of the elastic member (2) abuts against a side wall of the receiving groove (11) close to the handle (30), and the other end abuts against the blocking piece (33), and the limiting piece (32) is located on the side of the elastic member (2) away from the base (1).

2. The unlocking structure of an optical communication module according to claim 1, characterized in that: When the pull ring (3) is installed on the base (1), the limiting piece (32) is located in the accommodating groove (11), and the length of the limiting piece (32) is smaller than the length of the accommodating groove (11).

3. The unlocking structure of an optical communication module according to claim 1, characterized in that: The accommodating groove (11) is in communication with an outer side wall of the base (1) in the length direction.

4. The unlocking structure of an optical communication module according to claim 1, characterized in that: The inner wall of the unlocking push piece (31) is further provided with a secondary piece (34), the secondary piece (34) and the limiting piece (32) are arranged coplanarly, and a gap is left between the secondary piece (34) and the limiting piece (32); When the pull ring (3) is installed on the base (1), the secondary piece (34) is located in the accommodating groove (11); The base (1) is provided with a guide groove (12) corresponding to the auxiliary plate (34) on a side of the accommodating groove (11) away from the limiting plate (32).

5. The unlocking structure of an optical communication module according to claim 1, characterized in that: The blocking piece (33) is fixedly connected to the unlocking push piece (31) via the limiting piece (32).

6. The unlocking structure of an optical communication module according to claim 1, characterized in that: The elastic member (2) is a spring.

7. An optical communication module, characterized in that: An unlocking structure for an optical communication module according to any one of claims 1 to 6, wherein an upper cover (5) is installed on the base (1), and a limiting mechanism is provided between the upper cover (5) and the pull ring (3); The limiting mechanism is used to limit the maximum moving distance of the pull ring (3) moving in a direction away from the base (1).

8. An optical communication module according to claim 7, characterized in that: The limiting mechanism comprises a first limiting wall (50) and a second limiting wall; Both side walls of the upper cover (5) are provided with first sliding grooves (51); A second sliding groove (13) is formed on the side wall of the base (1) at a position corresponding to the first sliding groove (51); The first sliding groove (51) and the second sliding groove (13) together form a groove group for accommodating the unlocking push piece (31); The unlocking push piece (31) is provided with a secondary groove (320), and the limiting piece (32) is located in the secondary groove (320); A side wall of the first sliding groove (51) close to one end of the handle (30) is a first limiting wall (50); The side wall of the auxiliary groove (320) away from one end of the handle (30) is a second limiting wall; The first limiting wall (50) is located on the movement path of the second limiting wall.

9. An optical communication module according to claim 7, characterized in that: An inclined block (14) is fixedly provided on the upper end surface of the base (1) away from the pull ring (3), and the inclined block (14) is inclined from top to bottom in a direction away from the pull ring (3) on the side close to the pull ring (3); An inclined groove (52) is formed at one end of the upper cover (5) away from the pull ring (3), and the side of the inclined groove (52) away from the pull ring (3) is inclined from top to bottom in a direction away from the pull ring (3); The upper cover (5) is provided with a mounting hole (53), and a countersunk bolt (4) is passed through the mounting hole (53); The base (1) is provided with a threaded hole (15), and the countersunk bolt (4) is screwed into the threaded hole (15).

10. An optical communication module according to claim 7, characterized in that: A PCD plate (6) is detachably mounted on the base (1); The base (1) is vertically provided with semicircular clamping columns (16) on both sides of the PCD plate (6), and semicircular grooves (60) are opened on both sides of the PCD plate (6); The base (1) is further provided with limiting protrusions (161) on both sides of the PCD plate (6), and the upper cover (5) is provided with grooves at positions corresponding to the limiting protrusions (161); A plurality of top blocks (162) are provided on opposite sides of the base (1) and the upper cover (5).

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