CN220959831U - Bulletproof device for shooting training - Google Patents

Abstract

The application provides a bulletproof device for shooting training, which comprises a plurality of supporting legs, a mounting seat, a first bulletproof plate and a second bulletproof plate. The mounting seat is detachably mounted on the plurality of support legs. The first bulletproof plate is detachably arranged on the mounting seat. The second bulletproof plate is detachably arranged on the mounting seat and is enclosed with the first bulletproof plate to form a cavity. According to the bulletproof device for shooting training, the mounting seat is detachably arranged on the plurality of supporting legs, the first bulletproof plate and the second bulletproof plate are detachably arranged on the mounting seat, the bulletproof device can be changed according to the change of the target position, and the bulletproof device is convenient to detach and install and is beneficial to improving the convenience of use. In addition, as the cavity exists between the first bulletproof plate and the second bulletproof plate, the flying bullets can be effectively blocked, and the safety performance of the device is improved.

Description

Bulletproof device for shooting training

Technical Field

The utility model belongs to the technical field of bulletproof equipment, and particularly relates to a bulletproof device for shooting training.

Background

In practice firing practice, it is generally necessary to excavate a target pit, a sandbag, construct a conventional bulletproof device such as a bulletproof wall, etc., to prevent accidental injury caused by a live ball, and to provide a safe training environment. A great deal of manpower and material resources are consumed in using the three modes; and when the target position changes, a large amount of manpower and material resources are required to be invested again to adjust the position of the traditional bulletproof device, and the convenience of use is poor.

Disclosure of utility model

The embodiment of the application aims to provide a bulletproof device for shooting training, which aims to solve the technical problem of poor use convenience of the traditional bulletproof device in the prior art.

In order to achieve the above purpose, the application adopts the following technical scheme: there is provided a ballistic apparatus for shooting training comprising:

A plurality of legs;

the mounting seat is detachably mounted on the plurality of support legs;

the first bulletproof plate is detachably arranged on the mounting seat;

The second bulletproof plate is detachably arranged on the mounting seat and is enclosed with the first bulletproof plate to form a cavity.

Optionally, the mounting seat comprises a seat body, a limiting groove and a clamping block, the seat body is detachably mounted on a plurality of supporting legs, the limiting groove is formed in the seat body and can limit the first bulletproof plate along a first direction, and the clamping block is formed in the seat body and is positioned in the limiting groove; the first bulletproof plate is provided with a clamping groove, and the clamping block is clamped in the clamping groove and can limit the first bulletproof plate along the second direction.

Optionally, the clamping block tapers in a third direction from an end near the leg toward an end far from the leg.

Optionally, the mounting seat further comprises a plurality of clamping rods, and the clamping rods are connected to the seat body; the second bulletproof plate is provided with a plurality of clamping sleeves on one side facing away from the first bulletproof plate, and a plurality of clamping rods are respectively inserted into the clamping sleeves and can limit the clamping sleeves along a first direction and a second direction.

Optionally, the mounting base further includes a plurality of plug blocks, and the plug blocks are all connected to the base body; the support legs are provided with inserting grooves, and the inserting blocks are inserted into the inserting grooves respectively.

Optionally, the support leg is further provided with a storage groove and a avoidance groove, and the storage groove and the avoidance groove are both communicated with the inserting groove; the bulletproof device further comprises a plurality of elastic structures, wherein the elastic structures are installed in the containing groove and propped against between the plug-in blocks and the inner wall of the containing groove.

Optionally, the plugging block comprises a first block body and a second block body, the first block body is connected with the seat body, and the second block body is connected with one end of the first block body far away from the seat body; the size of the second block body along the first direction is larger than that of the first block body along the first direction, and the size of the storage groove along the first direction is larger than that of the avoidance groove along the first direction.

Optionally, a gap exists between the second bulletproof plate and the seat body; the seat body further comprises a storage box and a first inclined plane, wherein the storage box is installed on the seat body, and the first inclined plane is formed in the seat body.

Optionally, the first bulletproof plate comprises a first plate body and a second plate body, and the second plate body is attached to the first plate body.

Optionally, a side of the second plate body facing the second bulletproof plate is provided with a boss and a plurality of raised strips, and a second inclined plane is formed at one end of the boss away from the supporting leg.

The bulletproof device for shooting training provided by the application has the beneficial effects that:

According to the bulletproof device for shooting training, provided by the embodiment of the application, the mounting seat is detachably arranged on the plurality of support legs, the first bulletproof plate and the second bulletproof plate are detachably arranged on the mounting seat, the change can be carried out according to the change of the target position, the dismounting and the mounting are convenient, and the convenience of use is improved. In addition, as the cavity exists between the first bulletproof plate and the second bulletproof plate, the flying bullets can be effectively blocked, and the safety performance of the device is improved. In addition, adopt a plurality of stabilizer blades, can be used for supporting mount pad, first bulletproof board and second bulletproof board, be difficult for overturning, can improve the stability of device in the use.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a perspective view of a ballistic resistant device for training shooting according to an embodiment of the present application;

Fig. 2 is a perspective view showing a cross section of a ballistic apparatus for training use according to an embodiment of the present application.

Wherein, each reference sign in the figure:

100. a support leg; 110. a plug-in groove; 120. a storage groove; 130. a clearance groove;

200. A mounting base; 210. a base; 220. a limit groove; 230. a clamping block; 240. a clamping rod; 250. a plug block; 251. a first block; 252. a second block; 260. a storage box; 261. a notch; 270. a first inclined surface;

300. A first bulletproof plate; 310. a clamping groove; 320. a first plate body; 330. a second plate body; 331. a boss; 332. a convex strip; 333. a second inclined surface; 334. a surrounding baffle;

400. A second bulletproof plate; 410. a clamping sleeve;

500. A cavity;

600. An elastic structure;

700. A gap.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Based on the above, the utility model provides the bulletproof device for shooting training, which can be changed according to the change of the target position, is convenient to detach and install, and is beneficial to improving the convenience of use.

As shown in fig. 1 and 2, the present application provides a bulletproof device for shooting training, comprising a plurality of legs 100, a mounting base 200, a first bulletproof plate 300 and a second bulletproof plate 400. The mount 200 is detachably mounted to the plurality of legs 100. The first bulletproof plate 300 is detachably mounted to the mounting base 200. The second bulletproof plate 400 is detachably mounted to the mounting base 200, and encloses the first bulletproof plate 300 to form a cavity 500.

In the present embodiment, the number of the legs 100 is two. Of course, in other embodiments, the number of the legs 100 may be three, four, five … …, or any other number, depending on the practical application, which is not limited herein.

Specifically, in use of the device, the position of the two legs 100 is determined based on the target position. After the two legs 100 are mounted to the target positions, the mount 200 is mounted to the two legs 100, and then the first and second bulletproof plates 300 and 400 are mounted to the mount 200. When the position of the target is changed, the first bulletproof plate 300, the second bulletproof plate 400, and the mounting base 200 are disassembled in sequence, and the positions of the two legs 100 are re-determined according to the changed target positions, and the first bulletproof plate 300, the second bulletproof plate 400, and the mounting base 200 are re-installed.

More specifically, in the related art, since the bulletproof plate is mostly made of hard materials, the bullets are stopped from advancing by the bulletproof plate when the bullets are shot to the surface of the bulletproof plate in the shooting training process, and the bullets fly out from the surface of the bulletproof plate easily under the action of the bulletproof plate, thereby easily causing accidental injury. In the present embodiment, the first bulletproof plate 300 is a soft bulletproof plate, and the second bulletproof plate 400 is a hard bulletproof plate. In use, the bullet passes through the first bulletproof plate 300 first, and due to the cavity 500 between the first bulletproof plate 300 and the second bulletproof plate 400, the first bulletproof plate 300 can block the flying bullet when the bullet is blocked from flying out under the action of the second bulletproof plate 400.

According to the bulletproof device for shooting training, the mounting seat 200 is detachably mounted on the plurality of support legs 100, the first bulletproof plate 300 and the second bulletproof plate 400 are detachably mounted on the mounting seat 200, can be changed according to the change of the target position, and are convenient to detach and mount, so that convenience in use is improved. In addition, since the cavity 500 exists between the first bulletproof plate 300 and the second bulletproof plate 400, the flying bullets can be effectively blocked, and the safety performance of the device can be improved. In addition, the plurality of legs 100 can be used to support the mount 200, the first bulletproof plate 300, and the second bulletproof plate 400, so that the device is not prone to toppling, and the stability of the device during use can be improved.

Optionally, the foot 100 is fitted with a plurality of locking casters (not shown).

So set up, adopt a plurality of locking universal wheels, after the target position changes, can directly remove the device to the target position, help further improving the convenience of using. And the universal wheel can be locked in the use process, so that the position of the device is prevented from being changed in the use process.

In an embodiment of the present application, referring to fig. 1 and 2, the mounting base 200 includes a base 210, a limiting groove 220 and a clamping block 230, the base 210 is detachably mounted on the plurality of supporting legs 100, the limiting groove 220 is formed in the base 210, and is capable of limiting the first bulletproof plate 300 along the first direction, and the clamping block 230 is formed in the base 210 and is located in the limiting groove 220. The first bulletproof plate 300 is provided with a clamping groove 310, and the clamping block 230 is clamped in the clamping groove 310 and can limit the first bulletproof plate 300 along the second direction.

It should be noted here that the first direction above and below refers to a bidirectional direction along the axis thereof, specifically, the X-axis as shown in fig. 1. The second direction above and below refers to a bi-directional direction along its axis, specifically the Y-axis as shown in fig. 1.

So set up, adopting pedestal 210 and spacing groove 220, after installing first bullet proof plate 300 to spacing groove 220 in, can follow the first direction and spacing to first bullet proof plate 300, and then can prevent that first bullet proof plate 300 from following the first direction and remove. The first bulletproof plate 300 can be clamped to the clamping block 230 by adopting the clamping block 230 and the clamping groove 310, and the first bulletproof plate 300 can be limited along the second direction, so that the first bulletproof plate 300 can be prevented from moving along the second direction. To sum up, after the first bulletproof plate 300 is clamped to the mounting seat 200, the first bulletproof plate 300 can only move along the third direction, so that the bullet can be prevented from flying out of the cavity 500 due to the movement of the first bulletproof plate 300 relative to the mounting seat 200 during shooting training, the safety performance of the device can be further improved, the structural stability of the device can be improved, and the disassembly and the installation are convenient.

In an embodiment of the present application, referring to fig. 1 and 2 together, the clamping block 230 is gradually reduced from the end near the leg 100 to the end far from the leg 100 along the third direction.

In the present embodiment, the cross section of the engaging block 230 perpendicular to the first direction is a trapezoid. Of course, in other embodiments, the cross section of the clamping block 230 perpendicular to the first direction may be polygonal, semicircular, or other shapes according to practical application requirements.

It should be further noted that the above and below third directions refer to the bidirectional directions along the axis thereof, specifically the Z axis shown in fig. 1.

So set up, because joint piece 230 is along the one end that is close to stabilizer blade 100 along the third direction and is kept away from the one end of stabilizer blade 100 and taper the setting, when with first bullet proof plate 300 joint to joint piece 230 on, joint piece 230 of being convenient for aligns joint groove 310, and the installation of being convenient for helps further improving the convenience of use.

In an embodiment of the present application, referring to fig. 1 and 2, the mounting base 200 further includes a plurality of clamping bars 240, and the plurality of clamping bars 240 are connected to the base 210. The second bulletproof plate 400 has a plurality of clamping sleeves 410 on a side facing away from the first bulletproof plate 300, and the plurality of clamping rods 240 are respectively inserted into the plurality of clamping sleeves 410 and can limit the clamping sleeves 410 along the first direction and the second direction.

In this embodiment, the number of the locking bars 240 and the number of the locking sleeves 410 are two. Of course, in other embodiments, according to practical application requirements, the clamping rod 240 and the clamping sleeve 410 may be provided in three, four, five or other numbers, which is not limited herein.

So set up, adopt a plurality of clamping bars 240 and a plurality of joint cover 410, pedestal 210 and second bulletproof plate 400 can realize the joint and connect, and then can realize detachable connection, dismantlement simple to operate. The seat body 210 can limit the second bulletproof plate 400 along the first direction and the second direction through the clamping connection rod 240, so that the second bulletproof plate 400 can be prevented from moving relative to the seat body 210 in the shooting process, and the structural stability of the device can be improved. In addition, the plurality of the clamping bars 240 and the plurality of the clamping sleeves 410 are provided, and after the one-to-one corresponding clamping, the structural stability of the device is further improved compared with the prior art that the clamping bars 240 and the clamping sleeves 410 are only provided in one. Most importantly, the plurality of clamping rods 240 are adopted, the second bulletproof plate 400 can be supported through the plurality of clamping sleeves 410, so that a gap 700 is formed between the second bulletproof plate 400 and the seat body 210, after the first bulletproof plate 300 blocks the flying bullets, the bullets are discharged from the cavity 500 through the gap 700, the bullets can be prevented from being accumulated in the cavity 500, further, the bullets can be prevented from scattering everywhere when the first bulletproof plate 300 is replaced, the cleaning is convenient, and the convenience of use is improved.

In an embodiment of the present application, referring to fig. 1 and 2, the mounting base 200 further includes a plurality of plug blocks 250, and the plurality of plug blocks 250 are connected to the base 210. The plurality of support legs 100 are provided with inserting grooves 110, and the plurality of inserting blocks 250 are inserted into the plurality of inserting grooves 110 respectively.

So set up, adopt a plurality of grafting pieces 250 and a plurality of grafting groove 110, pedestal 210 can realize pegging graft with a plurality of stabilizer blade 100, and then can realize detachable connection, dismantlement simple to operate. The provision of the plurality of the socket blocks 250 and the plurality of the socket grooves 110 helps to improve the connection stability between the base 210 and the leg 100, compared to the provision of only one in the related art.

In an embodiment of the present application, referring to fig. 1 and 2, the stand bar 100 is further provided with a receiving slot 120 and a clearance slot 130, and the receiving slot 120 and the clearance slot 130 are both communicated with the inserting slot 110. The bulletproof device further comprises a plurality of elastic structures 600, wherein the elastic structures 600 are installed in the accommodating groove 120 and are propped against between the plug blocks 250 and the inner wall of the accommodating groove 120. The plug-in block 250 includes a first block 251 and a second block 252, the first block 251 being connected to the base 210, the second block 252 being connected to an end of the first block 251 remote from the base 210. Wherein, the dimension of the second block 252 along the first direction is greater than the dimension of the first block 251 along the first direction, and the dimension of the receiving groove 120 along the first direction is greater than the dimension of the avoidance groove 130 along the first direction.

In this way, the receiving groove 120 is used to receive and mount the elastic structure 600, and after the first block 251 and the second block 252 are mounted to the insertion groove 110, the elastic structure 600 can be abutted between the second block 252 and the inner wall of the receiving groove 120. The elastic structure 600 is adopted, in the shooting training process, the impact force of the bullet acts on the second bulletproof plate 400 along the first direction, and acts on the elastic structure 600 along the first direction through the clamping sleeve 410, the clamping rod 240, the base 210, the first block 251 and the second block 252, and the impact force acting on the second elastic plate is buffered through the elastic structure 600, so that the device can be prevented from overturning, and the stability of the device in the use process can be improved. With the avoidance groove 130, the first block 251 can be avoided when the second bulletproof plate 400 is buffered using the elastic structure 600, so that the first block 251 and the second block 252 can move in the first direction. Since the dimension of the second block 252 in the first direction is greater than the dimension of the first block 251 in the first direction, the dimension of the receiving groove 120 in the first direction is greater than the dimension of the clearance groove 130 in the first direction, and therefore the second block 252 can be restrained in the receiving groove 120 when moving in the first direction, so that the second block 252 can move only in the first direction, and the mount 200, the first bulletproof plate 300, and the second bulletproof plate 400 can be prevented from moving only in the first direction.

Optionally, the bulletproof device further includes a plurality of limit bolts (not shown in the drawings), which are screwed to the ends of the legs 100 away from the elastic structure 600, and are configured to move the second block 252 toward the elastic structure 600 in the first direction after the second block 252 is mounted in the insertion slot 110.

After the first block 251 and the second block 252 are inserted into the insertion groove 110, the first block 251 and the second block 252 can be driven to move towards the elastic structure 600 along the first direction by rotating the limit bolt until the second block 252 is limited in the storage groove 120, the first block 251 is limited in the avoidance groove 130, and the first block 251 and the second block 252 can be prevented from being directly separated from the insertion groove 110.

Alternatively, the elastic structure 600 is provided as a spring or a leaf spring.

In one embodiment of the present application, referring to fig. 1 and 2, a gap 700 exists between the second bulletproof plate 400 and the base 210. The base 210 further includes a storage box 260 and a first inclined surface 270, the storage box 260 is mounted on the base 210, and the first inclined surface 270 is opened on the base 210.

So set up, adopt containing box 260, can be used for collecting the bullet that drops from clearance 700 department, can prevent that the bullet from scattering everywhere, the clearance of being convenient for. By adopting the first inclined surface 270, the bullets can be prevented from being accumulated on the surface of the seat body 210, the bullets can be conveniently and directly dropped into the storage box 260 from the gap 700, the bullets can be conveniently collected, and the convenience of use can be improved.

Optionally, the storage box 260 starts to have notches 261 on both sides along the second direction.

So set up, adopt breach 261, when clearance containing box 260, can follow the bullet and clear out in the containing box 260, the clearance of being convenient for helps improving the convenience of using.

In one embodiment of the present application, referring to fig. 1 and 2, the first bulletproof plate 300 includes a first plate body 320 and a second plate body 330, and the second plate body 330 is attached to a side of the first plate body 320 facing the second bulletproof plate 400.

Here, in the present embodiment, the first plate 320 is provided as a rubber plate. In the present embodiment, the second plate 330 is set as a template.

So set up, adopt first plate 320 and second plate 330, the bullet of being convenient for passes first plate 320 and second plate 330, and after passing first plate 320 and second plate 330, the bullet receives the bullet that the second bullet-proof board 400 blockked and flies out, and first plate 320 and second plate 330 can block the bullet that flies out.

In an embodiment of the present application, referring to fig. 1 and 2 together, a side of the second plate body 330 facing the second bulletproof plate 400 is provided with a boss 331 and a plurality of protruding strips 332, and an end of the boss 331 away from the supporting leg 100 is provided with a second inclined surface 333.

So set up, adopt boss 331, after with second plate body 330 joint in pedestal 210, can make second plate body 330 and second bulletproof board 400 interval set up, guarantee to be formed with cavity 500 between second plate body 330 and the second bulletproof board 400, compare with not setting up cavity 500 in the correlation technique, can reduce the damage of bullet to second bulletproof board 400, help improving the life of this second bulletproof board 400. The second inclined surface 333 is used to guide the dropped bullet to the first inclined surface 270, so that the bullet can be prevented from piling up in the cavity 500, and the cleaning is facilitated. Adopt a plurality of sand grip 332, can be used for supporting second plate body 330, along with training time's increase, there is a large amount of spring holes first plate body 320 and second plate body 330, leads to second plate body 330 at least part panel to drop easily, through a plurality of sand grip 332, can be used for supporting and strengthening second plate body 330, can prevent as far as possible that second plate body 330's at least part panel from dropping, and then can prevent that the panel from blocking cavity 500, the bullet of being convenient for drops. In addition, it is possible to prevent the second plate body 330 from being empty due to the falling of at least a part of the plate material, so that it is possible to prevent the blocking effect of the first bullet-proof plate 300 against the flying bullet from being deteriorated.

Optionally, a side edge of the second plate body 330 facing the second bulletproof plate 400 has a fence 334.

So set up, adopt enclose keep off 334, can be used for enclosing cavity 500, can prevent that the bullet from flying out from between second plate body 330 and the second bullet-proof board 400, help further improving the security performance of the device.

One or more embodiments of the present application are intended to embrace all such alternatives, modifications and variations as fall within the broad scope of the present application. Accordingly, any omissions, modifications, equivalents, improvements and others which are within the spirit and principles of the one or more embodiments of the application are intended to be included within the scope of the application.

Claims (10)

1. A ballistic resistant device for shooting training comprising:

A plurality of legs (100);

A mounting base (200) detachably mounted to a plurality of the legs (100);

A first bulletproof plate (300) detachably mounted to the mounting base (200);

The second bulletproof plate (400) is detachably arranged on the mounting seat (200) and is enclosed with the first bulletproof plate (300) to form a cavity (500).

2. The ballistic protection apparatus for training shooting according to claim 1, wherein the mounting base (200) comprises a base body (210), a limiting groove (220) and a clamping block (230), the base body (210) is detachably mounted on a plurality of the supporting legs (100), the limiting groove (220) is opened in the base body (210) and can limit the first bulletproof plate (300) along a first direction, and the clamping block (230) is formed in the base body (210) and is positioned in the limiting groove (220); the first bulletproof plate (300) is arranged in the clamping groove (310), the clamping block (230) is clamped in the clamping groove (310), and the first bulletproof plate (300) can be limited in the second direction.

3. Ballistic protection apparatus for training according to claim 2, wherein the snap-in blocks (230) taper in a third direction from an end closer to the leg (100) towards an end further from the leg (100).

4. Ballistic protection apparatus for training according to claim 2, wherein the mounting base (200) further comprises a plurality of clamping bars (240), the plurality of clamping bars (240) being connected to the base body (210); the second bulletproof plate (400) is provided with a plurality of clamping sleeves (410) on one side, which is opposite to the first bulletproof plate (300), of the second bulletproof plate, the clamping rods (240) are respectively inserted into the clamping sleeves (410), and the clamping sleeves (410) can be limited in a first direction and a second direction.

5. Ballistic protection apparatus for training according to claim 2, wherein the mounting base (200) further comprises a plurality of plug-in blocks (250), a plurality of plug-in blocks (250) being connected to the base body (210); the support legs (100) are provided with inserting grooves (110), and the inserting blocks (250) are inserted into the inserting grooves (110) respectively.

6. Ballistic protection device for training according to claim 5, characterized in that the leg (100) is further provided with a receiving slot (120) and a clearance slot (130), both the receiving slot (120) and the clearance slot (130) being in communication with the plug-in slot (110); the bulletproof device further comprises a plurality of elastic structures (600), wherein the elastic structures (600) are installed in the containing groove (120) and are propped between the inserting blocks (250) and the inner wall of the containing groove (120).

7. Ballistic protection apparatus for training according to claim 6, wherein the plug-in block (250) comprises a first block (251) and a second block (252), the first block (251) being connected to the seat (210), the second block (252) being connected to an end of the first block (251) remote from the seat (210); wherein, the size of the second block (252) along the first direction is larger than the size of the first block (251) along the first direction, and the size of the accommodating groove (120) along the first direction is larger than the size of the avoidance groove (130) along the first direction.

8. Ballistic protection apparatus for training according to claim 2, wherein a gap (700) is present between the second ballistic panel (400) and the seat (210); the base body (210) further comprises a storage box (260) and a first inclined surface (270), the storage box (260) is installed on the base body (210), and the first inclined surface (270) is arranged on the base body (210).

9. Ballistic protection apparatus for training according to claim 2, wherein the first ballistic protection panel (300) comprises a first panel (320) and a second panel (330), the second panel (330) being attached to the first panel (320).

10. Ballistic protection device for training according to claim 9, characterized in that the side of the second plate body (330) facing the second ballistic protection plate (400) is provided with a boss (331) and a plurality of protruding strips (332), the boss (331) being provided with a second inclined surface (333) at the end remote from the foot (100).