阅读说明：本技术 一种车载主机 (Vehicle-mounted host ) 是由 印进才 来广鹏 欧振德 于 2019-09-04 设计创作，主要内容包括：本发明提供了一种车载主机,属于汽车技术领域。它解决了现有的车载主机的芯片模块置换效率较低的问题。本车载主机,包括壳体、芯片模块和可拆卸设置在壳体上的上盖,壳体内设有带动芯片模块移动的罩壳,上盖具有位于壳体内的翻边,罩壳上连接有固定件,固定件包括具有将翻边与罩壳限位的弹性臂,弹性臂远离罩壳的一侧上具有凸出的弹性片,上盖开设有与弹性片位置对应的通孔。本车载主机能在提高置换效率的同时降低成本。(The invention provides a vehicle-mounted host, and belongs to the technical field of automobiles. The chip module replacement method solves the problem that the replacement efficiency of the chip module of the existing vehicle-mounted host is low. This on-board host computer, including casing, chip module and can dismantle the upper cover that sets up on the casing, be equipped with the housing that drives the chip module and remove in the casing, the upper cover has the turn-ups that is located the casing, is connected with the mounting on the housing, the mounting has with turn-ups and the spacing elastic arm of housing including having, the elastic arm has convex flexure strip on keeping away from one side of housing, the upper cover is opened and is equipped with the through-hole that corresponds with the flexure strip position. This vehicle-mounted host machine can improve replacement efficiency and reduce cost.)

1. The utility model provides an on-vehicle host computer, includes casing (1), chip module (31) and can dismantle upper cover (2) of setting on casing (1), its characterized in that, be equipped with housing (33) that drives chip module (31) and remove in casing (1), upper cover (2) have turn-ups (21) that are located casing (1), be connected with mounting (4) on housing (33), mounting (4) are including having elasticity arm (41) with turn-ups (21) and housing (33) spacing, elasticity arm (41) are kept away from and are had convex flexure strip (411) on one side of housing (33), through-hole (22) that correspond with flexure strip (411) position are seted up in upper cover (2).

2. The vehicle-mounted host computer according to claim 1, wherein a heat sink (32) is connected to the chip module (31), the heat sink (32) is disposed above the chip module (31), the housing (33) covers the heat sink (32), a gap (34) is formed between the heat sink (32) and the chip module (31), the fixing member (4) further comprises a limiting piece (42) capable of being inserted into the gap (34), and the limiting piece (42) abuts against the lower end of the heat sink (32) and enables the heat sink (32) and the housing (33) to move synchronously.

3. The vehicle-mounted host computer according to claim 1 or 2, characterized in that the elastic arm (41) comprises a reset plate (412) which is arranged from bottom to top and is inclined towards the direction far away from the housing (33) and a guide plate (413) which is arranged from bottom to top and is inclined towards the direction close to the housing (33), wherein an abutting plate (414) abutting against the flange (21) is arranged on the guide plate (413), and an included angle is formed between the reset plate (412) and the guide plate (413).

4. A vehicle host according to claim 3, characterized in that the angle formed between the reset plate (412) and the guide plate (413) is obtuse.

5. A vehicle host according to claim 3, characterized in that the elastic piece (411) is arranged on a reset plate (412), the number of the abutting plates (414) is two, and a gap (415) is formed between the two abutting plates (414).

6. A vehicle host according to claim 3, characterized in that a rib (416) is provided between the reset plate (412) and the guide plate (413), and the rib (416) is recessed toward the housing (33) to form a notch (417).

7. The vehicle-mounted host computer according to claim 2, wherein the number of the elastic arms (41) is two, the fixing member (4) further comprises a positioning piece (43) arranged between the two elastic arms (41), the positioning piece (43), the elastic arms (41) and the limiting piece (42) are integrally formed, the lower end of the positioning piece (43) is connected with the housing (33), and the upper end of the positioning piece (43) is bent to form a positioning part (431) which is tightly abutted against the outer side wall of the housing (33).

8. A vehicle host according to claim 7, characterized in that, the elastic arm (41) and the positioning plate (43) have a distance (44) therebetween.

9. A vehicle host according to claim 1 or 2, wherein a motherboard (8) is fixed in the housing (1), the vehicle host further comprises a connector (11), a male board of the connector (11) is disposed on the motherboard (8), a female board of the connector (11) is disposed on the chip module (31), and a female board of the chip module (31) is plugged on the male board of the motherboard (8).

10. The vehicle-mounted host computer according to claim 9, wherein the main board (8) is fixedly connected with a guide seat (5), the housing (33) and the fixing member (4) are both disposed in an inner cavity (51) of the guide seat (5), and an outer side wall of the elastic arm (41) abuts against an inner cavity wall of the guide seat (5).

Technical Field

The invention belongs to the technical field of automobiles, and relates to a vehicle-mounted host.

Background

The vehicle-mounted host is a core part of the vehicle-mounted audio-video system, is arranged in a cab of a vehicle and has the main function of playing a sound source. With the continuous development of the existing science and technology, the functions which can be realized by the vehicle-mounted host are gradually improved, the model and the functions of each vehicle are different, and therefore the vehicle-mounted host in each vehicle is different.

The existing vehicle-mounted host comprises a shell, a chip module, a heat dissipation structure and the like, wherein the shell comprises a bottom plate, three side plates connected with three edges of the bottom plate, an upper cover and a rear cover, the rear cover is movably connected with two adjacent side plates and the upper cover, the upper cover is buckled on the three side plates and the rear cover, the shell with a cavity is formed, and the chip module, the heat dissipation structure and the like are arranged in the cavity of the shell.

The bottom in the casing is fixed to the mainboard now, sets up the chip module on the mainboard, and except chip module, other various components and parts have still been arranged on the mainboard, and the overall arrangement commonality of these components and parts is stronger, in the promotion of current on-vehicle host computer function, only need with change in the chip module can. Other components and parts are like housing and fin etc. on the mainboard, housing and fin etc. are the top that is located chip module, and pass through bolted connection between fin or housing and the chip module, perhaps adopt the welded mode to connect, thereby when having led to chip module to take out from the mainboard, each components and parts that need to be located on the chip module are dismantled, it is inconvenient to have led to the dismantlement of chip module, and when maintenance or change at every turn, all need take out one by one to each components and parts that are located on the chip module, make the replacement efficiency of chip module reduce, the function that has caused on-vehicle host computer promotes inconveniently.

Disclosure of Invention

The invention aims to provide a vehicle-mounted host aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to reduce the cost while improving the replacement efficiency.

The purpose of the invention can be realized by the following technical scheme:

The utility model provides an on-vehicle host computer, includes casing, chip module and can dismantle the upper cover that sets up on the casing, its characterized in that, be equipped with the housing that drives chip module and remove in the casing, the upper cover has the turn-ups that is located the casing, be connected with the mounting on the housing, the mounting is including having the spacing elastic arm with turn-ups and housing, the elastic arm has convex flexure strip on keeping away from one side of housing, the upper cover is opened and is equipped with the through-hole that corresponds with the flexure strip position.

This chip module can be along with the housing linkage, and the chip module is removable, when the performance of on-vehicle host computer is promoted to needs, only need change the chip module can, greatly reduced the cost that on-vehicle host computer performance promoted. The shell is arranged in the shell, the elastic arm limits the flanging and the shell, so that the upper cover cannot move out of the shell, the shell and the upper cover are fixed together, when the shell is positioned in the shell and can drive the chip module to move, when the chip module needs to be replaced, a certain space is kept between the shell and the flanging due to the limitation of the shell and the flanging by the elastic arm, the flanging cannot move out of the shell due to the limitation of the elastic arm, so that the upper cover cannot be opened, the dismounting part firstly passes through the through hole to extend into the shell to press the elastic piece downwards, the elastic piece is arranged in a protruding manner at one side of the elastic arm far away from the shell, so that after the dismounting part presses the elastic piece, one end of the elastic piece moves towards the elastic arm, the elastic arm can move outwards under the pressure of the elastic piece, and does not have a limiting force on the flanging, and the flanging can move in the shell, the upper cover is detached from the shell, then the housing is lifted upwards, the housing moves upwards to lift the chip module from the shell, and the housing can drive the chip module to move, so that in the new chip module re-installation process, only the new housing and the chip module need to be installed in the shell, and the replacement efficiency of the chip module is improved.

In the above vehicle-mounted host, the chip module is connected with a heat sink, the heat sink is arranged above the chip module, the housing is covered on the heat sink, a gap is formed between the heat sink and the chip module, the fixing member further comprises a limiting piece which can be embedded into the gap, and the limiting piece abuts against the lower end of the heat sink and enables the heat sink and the housing to move synchronously.

The setting of this structure, make the stable fin of being connected with the housing of mounting, and chip module and fin connection this moment, make the fin, chip module and housing can synchronous motion, and chip module, the chip module has been constituteed to fin and housing, thereby make whole chip module can be quick take out in the casing, and the setting of spacing piece, make the mounting can be with the stable being connected of fin and housing, the stability that the mounting is connected has been improved, thereby the condition that fin and housing break away from can not appear taking out whole chip module, the stability of chip module dismantlement has been improved.

In foretell on-vehicle host computer, the elastic arm includes that the orientation is kept away from the reset plate that the housing slope set up and is close to the deflector that the housing slope set up from supreme orientation down, be equipped with on the deflector with the turn-ups support by the board, form the contained angle between reset plate and the deflector.

Through the setting of the board that resets and deflector, the structure of elastic arm is simpler, and the contained angle has between board and the deflector that resets, make compressing tightly of elastic arm and press more convenience, and required pressing force is less, the change efficiency of chip module has been improved, and the setting of board and deflector that resets, make the required installation space of whole elastic arm less, and need not prepare extra installation space in on-vehicle host computer, the installation space of on-vehicle host computer has been saved.

In the above vehicle-mounted host, an included angle formed between the reset plate and the guide plate is an obtuse angle.

The setting of this structure for the backup plate on the deflector can be more stable compress tightly on the turn-ups, and the deflector can have the trend towards the housing motion all the time, has improved the stability of mounting.

In the above vehicle-mounted host, the elastic piece is arranged on the reset plate, the two abutting plates are provided, and a gap is formed between the two abutting plates.

Due to the arrangement of the limiting groove, the dismounting part can be partially placed in the gap, and when the dismounting part extrudes the elastic arm towards the housing direction, the dismounting part can always abut against the elastic arm and can play a role in guiding the dismounting part, so that the dismounting part is simpler and more convenient to dismount, and the replacement efficiency is improved; and the flexure strip sets up on the board that resets for the part of disassembling compresses tightly the flexure strip more easily and makes the flexure strip change and take place deformation, makes the more convenient of dismantlement of chip module.

In the vehicle-mounted host machine, a reinforcing rib is arranged between the reset sheet and the guide plate, and the reinforcing rib is sunken towards the housing to form a notch.

The setting of this structure has strengthened the joint strength between piece and the spacer that resets, also can supply with the position that the part of dismantling supported and lean on simultaneously for the part of dismantling can be better leans on with the elastic arm counterbalance, further improvement the intensity of elastic arm.

In the above vehicle-mounted host, the number of the elastic arms is two, the fixing part further comprises a positioning piece arranged between the two elastic arms, the positioning piece, the elastic arms and the limiting piece are integrally formed, the lower end of the positioning piece is connected with the housing, and the upper end of the positioning piece is bent to form a positioning part tightly abutted to the outer side wall of the housing.

the positioning piece is arranged, so that the strength of the fixing piece is enhanced, the fixing piece can be stably connected with the housing, and the problem that the fixing piece is deviated in the dismounting process to cause incapability of dismounting is avoided; the positioning part is arranged, on one hand, the strength of the fixing part is enhanced, on the other hand, the positioning piece is further pressed on the outer side wall of the housing, and the connection stability of the chip module is improved; adopt the integral type design for the structure of mounting is more stable, and spacing piece is located the below of spacer in the present case, makes setting up of spacing piece more stable.

In the above vehicle-mounted host, a space is provided between the elastic arm and the positioning piece.

The setting of this structure has reduced the weight of mounting, also makes the deformation of elastic arm not influence the deformation of spacer simultaneously for the spacer can be stable be connected with the housing, and the elastic arm can be better compress tightly the turn-ups on the housing, thereby the mounting can realize can firm be connected with the housing, can compress tightly the turn-ups on the housing again, and then make the use convenience more of mounting.

In the above vehicle-mounted host, the housing is provided with a plurality of heat dissipation holes.

The structure is provided with a plurality of radiating holes, so that heat generated by the chip module during working can be better radiated through the radiating holes after passing through the radiating fins.

In the vehicle-mounted host, the housing is fixedly connected with a mainboard, the vehicle-mounted host further comprises a connector, a male board of the connector is arranged on the mainboard, a female board of the connector is arranged on the chip module, and the female board of the chip module is inserted into the male board of the mainboard.

Because the chip module is spliced with the male board of the connector on the mainboard through the motherboard of the connector, severe jolting can be generated due to different road conditions in the driving process of a vehicle, the vehicle-mounted host runs under the jolting working condition, the chip module is easy to fall off from the connector, and in order to improve the connection stability of the chip module and the connector, the chip module is vertically limited by arranging the housing on the chip module and fixedly connecting the housing with the upper cover, so that the chip module is ensured not to be separated from the connector in the jolting working condition, and the setting stability of the chip module is improved.

In the above vehicle-mounted host, the mainboard is fixedly connected with the guide seat, the housing and the fixing piece are both arranged in the inner cavity of the guide seat, and the outer side wall of the elastic arm is abutted against the inner cavity wall of the guide seat.

In this case, be through guide way and direction muscle positioning between guide holder and the housing, and housing and mounting all set up in the inner chamber of guide holder, and the mounting sets up between housing and guide holder, and the lateral wall through elastic arm on the mounting supports with the inner chamber wall of guide holder and leans on, avoids the position of housing to take place to remove, has improved the stability when on-vehicle host computer uses.

Compared with the prior art, this on-vehicle host computer has the advantage: in the existing vehicle-mounted host, a plurality of components are arranged on a chip module, and the chip module is connected with or welded with a mainboard, so that when the vehicle-mounted host needs to be upgraded, the plurality of components on the chip module need to be taken out firstly to disassemble the chip module, or the mainboard is directly replaced, different mainboards need to be developed in a targeted manner for different vehicle-mounted hosts, and thus, not only is material waste caused, but also the development cost is increased, and the development period is longer; what the present case adopted is to set up the chip module on the chip module, and chip module, heating panel, housing accessible mounting are taken out in following the upper cover fast this moment, consequently can directly change whole chip module, have avoided needing to research and develop new mainboard for the replacement efficiency of on-vehicle host computer function replacement or promotion obtains promoting, thereby can improve the replacement efficiency of on-vehicle host computer function replacement or promotion.

Drawings

Fig. 1 is a schematic configuration diagram of the host computer on board the vehicle.

Fig. 2 is a partial configuration diagram of the host computer on board the vehicle.

Fig. 3 is a schematic structural diagram of a chip module in the host computer.

Fig. 4 is a partial exploded view of the chip module in the host computer.

Fig. 5 is a schematic structural diagram of a fixing member in the host computer mounted on the vehicle.

Fig. 6 is a partial front view of the host computer on board the vehicle.

Fig. 7 is a schematic structural view of the chip module in the host computer mounted on the vehicle in another direction.

Fig. 8 is a schematic structural view of a guide shoe in the host machine mounted on the vehicle.

Fig. 9 is a schematic structural view of a housing in the host vehicle.

Fig. 10 is a schematic structural diagram of the assembly of the heat sink, the housing, the fixing member and the dismounting member in the vehicle-mounted host machine.

Fig. 11 is a schematic structural view of the vehicle-mounted host machine after the heat sink, the cover and the fixing member are assembled.

Fig. 12 is a schematic structural view of a housing in the host machine mounted on the vehicle.

Fig. 13 is a schematic structural view of the mount in the host vehicle in another direction.

Fig. 14 is a side view of the mount in the host vehicle.

Fig. 15 is a partial structural schematic diagram of the vehicle-mounted host machine after the fixed member and the detachable member are assembled.

In the figure, 1, a housing; 11. a connector; 2. an upper cover; 21. flanging; 22. a through hole; 3. a chip module; 31. a chip module; 32. a heat sink; 33. a housing; 331. heat dissipation holes; 34. a gap; 4. a fixing member; 41. a resilient arm; 411. an elastic sheet; 412. a reset plate; 413. a guide plate; 414. a backup plate; 415. a void; 416. reinforcing ribs; 417. a recess; 42. a limiting sheet; 43. positioning plates; 431. a positioning part; 44. spacing; 5. a guide seat; 51. a cavity; 52. a frame body; 53. a lug; 6. a fastener; 7. disassembling the parts; 8. a main board.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 to 15, the host computer includes a housing 1, a motherboard 8, a chip module 31, and an upper cover 2 detachably disposed on the housing 1, the motherboard 8 is fixed in the housing 1, the host computer further includes a connector 11, a male board of the connector 11 is disposed on the motherboard 8, a female board of the connector 11 is disposed on the chip module 31, and a female board of the chip module 31 is plugged on the male board of the motherboard 8.

A housing 33 which drives the chip module 31 to move is arranged in the shell 1, the upper cover 2 is provided with a flanging 21 positioned in the shell 1, the housing 33 is connected with a fixing piece 4, the fixing piece 4 comprises an elastic arm 41 which always has the tendency of pressing the flanging 21 on the housing 33, one side of the elastic arm 41 away from the housing 33 is provided with a convex elastic sheet 411, and the upper cover 2 is provided with a through hole 22 corresponding to the elastic sheet 411; the chip module 31 is connected with a heat sink 32, the housing 33 covers the heat sink 32, and the chip module 31, the heat sink 32 and the housing 33 form a chip module 3.

As shown in fig. 9, the housing 1 is formed by surrounding a bottom plate and four side plates vertically arranged on the bottom plate, and the upper cover 2 is arranged opposite to the bottom plate.

The shape of the shell 1 is arranged, so that the whole vehicle-mounted host is more convenient to install, and components in the vehicle-mounted host are prevented from interfering with other parts in a vehicle.

As shown in fig. 12, the housing 33 is surrounded by a top plate and four baffles vertically disposed on the top plate, and a plurality of heat dissipation holes 331 are formed on both the top plate and the baffles.

As shown in fig. 2, the flanges 21 of the upper cover 2 are arranged downward, four flanges 21 are provided, the four flanges 21 and four baffles are arranged in one-to-one correspondence, and the flanges 21 are arranged outside the housing 33.

As shown in fig. 4, the heat sink 32 includes a heat sink plate and a plurality of heat sink strips disposed on the heat sink plate, a certain distance is provided between two adjacent heat sink strips, the heat sink plate is square, connecting holes are disposed at four corners of the heat sink plate, the heat sink strips can be embedded into the housing 33, and the heat sink plate abuts against the baffle of the housing.

As shown in fig. 4 and 11, the chip module 31 is square, and the four corners of the chip module 31 have connecting bolts, the four connecting bolts and the four connecting holes are arranged in a one-to-one correspondence manner, at this time, the heat sink 32 is connected with the chip module 31 through the connecting bolts, and the end portions of the connecting bolts can penetrate into the corresponding connecting holes.

As shown in fig. 4-15, the chip module 31 is connected with a heat sink 32, the heat sink 32 is disposed above the chip module 31, the cover 33 covers the heat sink 32, a gap 34 is formed between the heat sink 32 and the chip module 31, the fixing member 4 further includes a position-limiting piece 42 capable of being inserted into the gap 34, and the position-limiting piece 42 abuts against the lower end of the heat sink 32 and enables the heat sink 32 and the cover 33 to move synchronously.

The chip module 31, the heat sink 32, and the cover 33 constitute a chip module group 3.

The working principle is as follows: chip module 31 is as the core part of on-vehicle host computer, updates and changes as required to on-vehicle host computer, mainly changes chip module 31, and this housing 33 can drive chip module 31 and remove, and chip module 31 is removable, when the performance of on-vehicle host computer needs to be promoted, only need to change chip module 31 can, greatly reduced the cost that on-vehicle host computer performance promoted. By arranging the housing 33 in the housing 1, the elastic arm 41 presses the flange 21 against the housing 33, the housing 33 is fixed with the upper cover 2, when the housing 33 is positioned in the housing 1, the housing 33 and the heat sink 32 can both drive the chip module 31 to move, when the chip module 31 needs to be replaced, because the housing 33 and the flange 21 are pressed by the elastic arm 41, the upper cover 2 cannot be opened at this time, the dismounting member 7 firstly passes through the through hole 22 and extends into the housing 1 to press the elastic piece 411 downwards, the dismounting member 7 is a U-shaped elastic metal rod, because the elastic piece 411 is formed by protruding on one side of the elastic arm 41 far from the housing 33, after the dismounting member 7 is pressed by the elastic piece 411, one end of the elastic piece 411 bends towards the direction close to the elastic arm 41, the elastic arm 41 can move towards the direction far from the flange 21 under the pressure of the elastic piece, at this time, the elastic arm 41 does not contact with the flange 21, the flanging 21 has no limiting force, the upper cover 2 is detached from the shell 1, then the housing 33 is lifted upwards, the housing 33 moves upwards to lift the chip module 31 and the radiating fins 32 out of the shell 1, and due to the synchronous moving arrangement of the housing 33, the radiating fins 31 and the chip module 31, in the process of reinstalling a new chip module 31, only the new housing 33, the radiating fins 32 and the chip module 31 need to be installed into the shell 1, so that the replacement efficiency of the chip module 31 is improved.

The connector is a board-to-board connector (BTB connector).

The vehicle-mounted host can be a multimedia vehicle-mounted host, a vehicle-mounted GPS host, a vehicle-mounted sound host, a vehicle-mounted cloud host and the like.

As shown in fig. 2 to 4, the elastic arm 41 includes a reset plate 412 disposed from bottom to top and inclined away from the housing 33, and a guide plate 413 disposed from bottom to top and inclined toward the housing 33, an abutting plate 414 abutting against the flange 21 is formed on two sides of the guide plate 413 in a protruding manner, the abutting plate 414 is arranged in an inclined manner, the inclined direction of the abutting plate 414 is the same as the inclined direction of the guide plate 413, the abutting plate 414 has friction teeth thereon, and an included angle is formed between the reset plate 412 and the guide plate 413, and the included angle is an obtuse angle.

As shown in fig. 2 to 4, the elastic piece 411 is disposed on the reset plate 412, each guide plate 413 has two abutting plates 414, a gap 415 for the dismounting member 7 to pass through is formed between the two abutting plates 414, and the abutting plates 414 are located obliquely above the guide plates 413.

As shown in fig. 5 and 13, a rib 416 is provided between the reset plate 412 and the guide plate 413, and the rib 416 is recessed toward the housing 33 to form a notch 417.

The reinforcing ribs 416 are formed by recessing the housing 33, and the side walls of the reinforcing ribs 416 are in arc transition with the side walls of the housing 33.

As shown in fig. 13, the elastic pieces 411 are disposed on the reset plate 412, two elastic pieces 411 are disposed, the elastic pieces 411 and the reset plate 412 are disposed in an inclined manner, and the reset plate 412 is provided with a relief hole at a projection position of the elastic pieces 411.

One of the elastic pieces 411 is disposed to be inclined downward, the other elastic piece 411 is disposed to be inclined upward, and one of the elastic pieces 411 is located above the other elastic piece 411.

As shown in fig. 5 and 13, the number of the elastic arms 41 is two, the fixing member 4 further includes a positioning piece 43 disposed between the two elastic arms 41, the positioning piece 43 is connected with the limiting piece 42, the positioning piece 43, the elastic arms 41 and the limiting piece 42 are integrally formed, the lower end of the positioning piece 43 is connected with the housing 33 through a bolt, the upper end of the positioning piece 43 is bent to form a positioning portion 431 tightly abutting against the outer side wall of the housing 33, and a space 44 is provided between the elastic arms 41 and the positioning piece 43.

As shown in fig. 13-15, the width of the positioning portion 431 is greater than the width of the positioning plate 43, the end and both sides of the positioning portion 431 are provided with elastic tongues, and the middle of the positioning plate 43 is provided with a fixing hole for a fastening bolt to pass through.

As shown in fig. 13-15, the reset plate 412 is formed with a limit stop protruding therefrom, and the limit stop is disposed on a side away from the positioning plate 43.

As shown in fig. 6 and 8, the main plate 8 is fixedly connected with the guide seat 5, the housing 33 and the fixing member 4 are both disposed in the cavity 51 of the guide seat 5, and the outer side wall of the elastic arm 41 abuts against the inner cavity wall of the guide seat 5.

As shown in fig. 8, the guide seat 5 includes a frame body 52, the frame body 52 is formed by surrounding a metal plate, a protruding lug 53 is formed at the edge of the frame body 52 in a protruding manner, the protruding lug 53 is connected with the main plate 8 through a screw, and a plurality of reinforcing ribs are arranged on the outer side wall of the frame body 52.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.