CN114754246B - Clamping device for monitoring equipment - Google Patents

Abstract

The application provides a clamping device for monitoring equipment, which comprises a camera, wherein the camera comprises a main body and a mounting plate, and the main body is fixedly connected to the mounting plate; and the wind vane component is arranged on one side of the mounting plate and comprises a first rotating disc component, a second rotating disc component and a rotating rod mechanism, wherein the first rotating disc component and the second rotating disc component are sleeved on the rotating rod mechanism, and the rotating rod mechanism is connected on one side of the camera. According to the wind power self-adaptive control method and device, the wind power self-adaptive control method and device can be used for protecting the monitoring equipment according to the wind power self-adaptive change of the area where the monitoring equipment is located.

Description

A clamping device for monitoring equipment

Technical field

The present invention relates to the technical field of monitoring equipment, and in particular, to a clamping device for monitoring equipment.

Background technique

At present, as environmental pollution intensifies, extreme weather is becoming more and more common. Mining monitoring equipment often encounters severe weather such as strong winds when operating in high mountains. Strong winds and other severe weather will lift small stones or debris on the ground and fly away, so it is easy to cause damage to the camera in strong winds.

Contents of the invention

The purpose of this section is to outline some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section, the abstract and the title of the invention to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions cannot be used to limit the scope of the invention.

In order to solve the above technical problems, the present invention provides the following technical solution: a clamping device for monitoring equipment, including a camera, the camera includes a main body and a mounting plate, the main body is fixedly connected to the mounting plate; and, a wind vane component, The wind vane component is arranged on one side of the mounting plate. The wind vane component includes a first turntable assembly, a second turntable assembly and a rotating rod mechanism. The first turntable assembly and the second turntable assembly are both sleeved on the rotating rod mechanism. The rotating rod mechanism is connected to one side of the camera.

As a preferred solution of the clamping device for monitoring equipment of the present invention, the rotating rod mechanism includes a vertical rod, a bottom plate and a rotating wheel. The rotating wheel is rotatably connected to the top of the vertical rod, and the other end of the vertical rod Turn the connecting base plate.

As a preferred solution of the clamping device for monitoring equipment of the present invention, the first turntable assembly includes a first turntable mechanism and a clamping mechanism, the first turntable mechanism is rotationally connected to the vertical rod, and the One end of the clamping mechanism is connected to the first turntable mechanism, and the other end of the clamping mechanism is connected to the mounting plate.

As a preferred solution of the clamping device for monitoring equipment of the present invention, the first turntable mechanism includes a first disk, a first throwing block, a first spring and a first gear. Rotatingly connected to the vertical rod, the first disk is provided with a number of first grooves, and a number of first grooves are equidistantly distributed outside the first disk, and one end of the first throwing block is movably connected to the vertical rod. , one side of the first throwing block is fixedly connected to the first spring, the other end of the first spring is fixedly connected to the vertical rod, and the first gear is fixed to the lower end of the first disk.

As a preferred solution of the clamping device for monitoring equipment of the present invention, the clamping mechanism includes a first worm, a buffer and a first nut, the first worm meshes with the first gear, and the third The other end of a worm is provided with an external thread, the end of the first worm away from the first gear penetrates the buffer member, and the end of the first worm away from the first gear is threadedly connected to the first nut.

As a preferred solution of the clamping device for monitoring equipment of the present invention, the buffer member includes an extrusion plate, a buffer spring and a rubber pad. One end of the extrusion plate is fixedly connected to the rubber pad, and the other end of the rubber pad is fixedly connected to the rubber pad. One end is fixedly connected to the installation plate, a buffer spring is provided between the extrusion plate and the installation plate, and the bottom end of the extrusion plate is fixedly connected to the bottom plate.

As a preferred solution of the clamping device for monitoring equipment of the present invention, the second turntable assembly includes a second turntable mechanism and a protection mechanism. The second turntable mechanism is rotationally connected to the vertical rod, and the protection mechanism One end of the mechanism is connected with the second turntable mechanism.

As a preferred solution of the clamping device for monitoring equipment of the present invention, the second turntable mechanism includes a second disk, a second throwing block, a second spring and a second gear. Rotatingly connected to the vertical rod, the second disk is provided with a number of second grooves, and a number of second grooves are equidistantly distributed inside the second disk. One end of the second throwing block is movably connected to the vertical rod. , one side of the second throwing block is fixedly connected to the second spring, the other end of the second spring is fixedly connected to the vertical rod, and the second gear is fixed to the lower end of the second disk.

As a preferred solution of the clamping device for monitoring equipment of the present invention, the protection mechanism includes a second worm, a protective plate, a connecting rod and a second nut, and the second worm meshes with the second gear, so One end of the second worm is rotatably connected to the extrusion plate. A chute is provided on the bottom plate. A protrusion is provided at the lower end of the protective plate. The protrusion is slidably connected to the bottom plate in the chute. The second nut Set on the second worm, the second worm is provided with an external thread, the second nut is threadedly connected to the second worm, one side of the second nut is fixedly connected to one end of the connecting rod, and the other end of the connecting rod Securely connect one side of the protective plate.

Beneficial effects of the present invention: The present invention can adaptively change the wind power in the area where the monitoring equipment is located, thereby effectively protecting the monitoring equipment.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present invention more clearly, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without exerting any creative effort. in:

Figure 1 is a schematic diagram of the overall structure;

Figure 2 is a schematic structural diagram of the wind vane component;

Figure 3 is a schematic structural diagram of the first turntable mechanism;

Figure 4 is a schematic structural diagram of the clamping mechanism;

Figure 5 is a schematic structural diagram of the second turntable mechanism;

Figure 6 is a schematic structural diagram of the protective mechanism.

Detailed ways

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention will be described in detail below with reference to the accompanying drawings.

Many specific details are set forth in the following description to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Those skilled in the art can do so without departing from the connotation of the present invention. Similar generalizations are made, and therefore the present invention is not limited to the specific embodiments disclosed below.

Example 1

This embodiment provides a clamping device for monitoring equipment, as shown in Figures 1 to 2,

The device includes a camera 100. The camera 100 includes a main body 101 and a mounting plate 102. The main body 101 is fixedly connected to the mounting plate 102; and a wind vane component 200. The wind vane component 200 is provided on one side of the mounting plate 102. The wind vane component 200 includes a first turntable. The assembly 201, the second turntable assembly 202 and the rotating rod mechanism 203. The first turntable assembly 201 and the second turntable assembly 202 are both set on the rotating rod mechanism 203. The rotating rod mechanism 203 is connected to the side of the camera 100.

The rotating rod mechanism 203 includes a vertical rod 203a, a bottom plate 203b and a rotating wheel 203c. The rotating wheel 203c is rotatably connected to the top of the vertical rod 203a, and the other end of the vertical rod 203a is rotatably connected to the bottom plate 203b.

The main body 101 is fixed on the mounting plate 102 through bolts, and the wind vane component 200 is installed on the side of the camera 100. The magnitude of the wind force can be judged by observing the rotation speed of the wind vane component 200. The rotating wheel 203c in the rotating rod mechanism 203 includes a horizontal bar and a wind plate. The wind plates are fixed on both sides of the crossbar. The wind plates are directly affected by the wind, so the rotating wheel 203c can drive the vertical rod 203a to rotate. The vertical rod 203a is connected to the bottom plate 203b through bearings. The first turntable assembly 201 and the second turntable assembly 202 installed on the vertical pole 203a can adaptively adjust the monitoring equipment according to the strength of the wind to avoid damage to the monitoring equipment in windy weather.

Example 2

This embodiment provides a clamping device for monitoring equipment, as shown in Figures 1 to 4. This embodiment is based on Embodiment 1 but is different from Embodiment 1 in that:

The first turntable assembly 201 includes a first turntable mechanism 201a and a clamping mechanism 201b. The first turntable mechanism 201a is rotatably connected to the vertical rod 203a. One end of the clamping mechanism 201b is connected to the first turntable mechanism 201a, and the other end of the clamping mechanism 201b is connected. Mounting plate 102.

The first turntable mechanism 201a includes a first disk 201a-1, a first throwing block 201a-2, a first spring 201a-3 and a first gear 201a-4. The first disk 201a-1 is rotatably connected to a vertical rod. 203a, the first disc 201a-1 is provided with a number of first grooves 201a-11, and the number of first grooves 201a-11 are equidistantly distributed outside the first disc 201a-1. One end of the block 201a-2 is movably connected to the vertical rod 203a, one side of the first throwing block 201a-2 is fixedly connected to the first spring 201a-3, and the other end of the first spring 201a-3 is fixedly connected to the vertical rod 203a. , the first gear 201a-4 is fixed on the lower end of the first disk 201a-1.

There are a number of first throwing blocks 201a-2 on the vertical pole 203a. The plurality of first throwing blocks 201a-2 are evenly distributed on the vertical pole 203a. The first throwing blocks 201a-2 are in an "S" shape as a whole. The first throwing blocks 201a -2 is provided with a round hole on one end, and a groove is provided on the vertical rod 203a. A pin is provided in the groove. The round hole on the first throwing block 201a-2 matches the pin, that is, the first throwing block 201a-2 It is sleeved on the pin shaft, one end of the first spring 201a-3 is connected to the middle position of the first throwing block 201a-2, and the other end of the first spring 201a-3 is fixedly connected to the vertical rod 203a, so when the vertical rod 203a rotates , the first throwing block 201a-2 will unfold in an umbrella shape under the action of centrifugal force, and finally the centrifugal force and the pulling force of the first spring 201a-3 will reach a two-force balance state. The first disk 201a-1 is rotatably connected to the vertical rod 203a. The first disk 201a-1 is provided with a number of first grooves 201a-11. The number of the first grooves 201a-11 is the same as that of the first throwing block 201a-2. The numbers are equal, and the first grooves 201a-11 are provided on the outside of the first disk 201a-1, and their thickness increases from the innermost to the outermost on the first disk 201a-1. When the vertical rod 203a rotates, the first throwing block 201a-2 expands in an umbrella shape under the action of centrifugal force. When the wind force is weak, the first throwing block 201a-2 expands at a smaller angle, and the first throwing block 201a-2 One end just rotates into the first groove 201a-11. At this time, the side of the first throwing block 201a-2 contacts the side of the first groove 201a-11, and then the vertical rod 203a drives the first disc 201a-1 to rotate. , the rotation of the first disk 201a-1 drives the first gear 201a-4 below it to rotate, and the rotation of the first gear 201a-4 drives the clamping mechanism 201b to clamp. When the wind force is strong, the first throwing block 201a -2 expands at a larger angle, then the first throwing block 201a-2 moves out of the first groove 201a-11. At this time, the first disk 201a-1 no longer rotates following the vertical rod 203a.

The clamping mechanism 201b includes a first worm 201b-1, a buffer 201b-2 and a first nut 201b-3. The first worm 201b-1 meshes with the first gear 201a-4. The first worm 201b-1 The other end is provided with an external thread. The end of the first worm 201b-1 away from the first gear 201a-4 penetrates the buffer 201b-2. The end of the first worm 201b-1 away from the first gear 201a-4 is threadedly connected to the first nut 201b. -3.

The first worm 201b-1 meshes with the first gear 201a-4, so when the first gear 201a-4 rotates, the first worm 201b-1 rotates. The other end of the first worm 201b-1 is provided with a thread, and the first worm 201b-1 is threadedly connected to the first nut 201b-3, and the first nut 201b-3 is in the groove on one side of the buffer 201b-2. That is, when the first worm 201b-1 rotates, the first nut 201b-3 only When the first worm 201b-1 moves along the axial direction, it will not rotate due to the limitation of the groove. At the same time, a section of polished rod is provided on the thread side of the first worm 201b-1. When the first nut 201b-3 is driven by the first worm 201b-1 and moves to the polished rod, the first worm 201b-1 continues to rotate. The first nut 201b-3 does not move.

The buffer member 201b-2 includes an extrusion plate 201b-21, a buffer spring 201b-22 and a rubber pad 201b-23. One end of the extrusion plate 201b-21 is fixedly connected to the rubber pad 201b-23. The rubber pad 201b- The other end of 23 is fixedly connected to the installation plate 102. A buffer spring 201b-22 is provided between the extrusion plate 201b-21 and the installation plate 102. The bottom end of the extrusion plate 201b-21 is fixedly connected to the base plate 203b.

There is a rubber pad 201b-23 between the installation plate 102 and the extrusion plate 201b-21. When the installation plate 102 is driven by the first worm 201b-1 and the first nut 201b-3, it moves toward the extrusion plate 201b-21. Move, the installation plate 102 squeezes the rubber pad 201b-23, the installation plate 102 is more stably fixed on the extrusion plate 201b-21, and at the same time, a buffer spring 201b is provided between the installation plate 102 and the extrusion plate 201b-21. -22, further ensuring the relative stability between the mounting plate 102 and the extrusion plate 201b-21.

When the wind force is low, the first worm 201b-1 rotates to drive the first nut 201b-3 to move. The movement of the first nut 201b-3 reduces the distance between the mounting plate 102 and the extrusion plate 201b-21, and the rubber pad 201b-23 Being squeezed effectively increases the stability of the mounting plate 102 and the extruding plate 201b-21, that is, ensuring the stability of the camera 100 being installed on the mounting plate 102.

Example 3

This embodiment provides a clamping device for monitoring equipment, as shown in Figures 1 to 6. This embodiment is based on Embodiment 1 but is different from Embodiments 1 and 2 in that:

The second turntable assembly 202 includes a second turntable mechanism 202a and a protection mechanism 202b. The second turntable mechanism 202a is rotatably connected to the vertical rod 203a. One end of the protection mechanism 202b is connected to the second turntable mechanism 202a.

The second turntable mechanism 202a includes a second disk 202a-1, a second throwing block 202a-2, a second spring 202a-3 and a second gear 202a-4. The second disk 202a-1 is rotatably connected to On the vertical rod 203a, the second disk 202a-1 is provided with a plurality of second grooves 202a-11, and the plurality of second grooves 202a-11 are equidistantly distributed inside the second disk 202a-1. One end of the second throwing block 202a-2 is movably connected to the vertical rod 203a, one side of the second throwing block 202a-2 is fixedly connected to the second spring 202a-3, and the other end of the second spring 202a-3 is fixedly connected to the vertical rod. 203a, the second gear 202a-4 is fixed on the lower end of the second disc 202a-1.

A number of second throwing blocks 202a-2 are provided on the vertical pole 203a. The plurality of second throwing blocks 202a-2 are evenly distributed on the vertical pole 203a. The second throwing blocks 202a-2 are in an "S" shape as a whole. The second throwing blocks 202a -2 is provided with a round hole on one end, a groove is provided on the vertical rod 203a, and a pin is provided in the groove. The round hole on the second throwing block 202a-2 matches the pin, that is, the second throwing block 202a-2 Set on the pin, one end of the second spring 202a-3 is connected to the middle position of the second throwing block 202a-2, and the other end of the second spring 202a-3 is fixedly connected to the vertical rod 203a, so when the vertical rod 203a rotates At this time, the second throwing block 202a-2 will unfold in an umbrella shape under the action of centrifugal force, and finally the centrifugal force and the pulling force of the second spring 202a-3 will reach a two-force balance state. The second disc 202a-1 is rotatably connected to the vertical rod 203a. The second disc 202a-1 is provided with a number of second grooves 202a-11. The number of the second grooves 202a-11 is the same as that of the second throwing block 202a-2. The numbers are equal, and the second grooves 202a-11 are provided inside the second disk 202a-1. When the vertical rod 203a rotates, the second throwing block 202a-2 expands in an umbrella shape under the action of centrifugal force. When the wind force is weak, the second throwing block 202a-2 expands at a smaller angle, and the second throwing block 202a-2 It is not in contact with the second disk 202a-1, and the second disk 202a-1 does not rotate at this time. When the wind force increases, the expansion angle of the second throwing block 202a-2 increases, and the lower end of the second throwing block 202a-2 In contact with the second groove 202a-11, the second throwing block 202a-2 drives the second disc 202a-1 to rotate. After the second disc 202a-1 rotates, it drives the second gear 202a-4 below it to rotate. , the rotation of the second gear 202a-4 drives the protection mechanism 202b to start working.

The protective mechanism 202b includes a second worm 202b-1, a protective plate 202b-2, a connecting rod 202b-3 and a second nut 202b-4. The second worm 202b-1 meshes with the second gear 202a-4, so One end of the second worm 202b-1 is rotatably connected to the extrusion plate 201b-21. The bottom plate 203b is provided with a chute. The lower end of the protective plate 202b-2 is provided with a protrusion. The protrusion is in the chute. Slidingly connected to the bottom plate 203b, the second nut 202b-4 is sleeved on the second worm 202b-1, the second worm 202b-1 is provided with an external thread, and the second nut 202b-4 is connected to the second worm 202b-1. The worm 202b-1 is threaded, one side of the second nut 202b-4 is fixedly connected to one end of the connecting rod 202b-3, and the other end of the connecting rod 202b-3 is fixedly connected to one side of the protective plate 202b-2.

The second worm 202b-1 meshes with the second gear 202a-4. When the second gear 202a-4 rotates, the second worm 202b-1 rotates. The second worm 202b-1 is provided with external threads. The second worm 202b- 1 is provided with a second nut 202b-4, and one side of the second nut 202b-4 is connected to the protective plate 202b-2 through the connecting rod 202b-3. Therefore, when the second worm 202b-1 rotates, the second nut 202b- 4 When the second worm 202b-1 moves along the axis of the second worm 202b-1, when the second worm 202b-1 rotates, the second nut 202b-4 will drive the protective plate 202b-2 to move. Furthermore, the camera 100 is blocked by the protective plate 202b-2. There are two protective plates 202b-2, and the lower ends of the two protective plates 202b-2 are connected by a cross bar. A section of polished rod is provided at the threaded end of the second worm 202b-1. When the second nut 202b-4 rotates into the polished rod, the rotation of the second worm 202b-1 no longer drives the movement of the second nut 202b-4.

When the wind is strong, the second worm 202b-1 rotates to drive the second nut 202b-4 to rotate, and then the second nut 202b-4 drives the two protective plates 202b-2 to block the camera 100, effectively protecting the camera 100 in strong winds. Avoid being hit by flying rocks flying in the air in bad weather.

It is important to note that the construction and arrangements of the present application shown in various exemplary embodiments are illustrative only. Although only a few embodiments are described in detail in this disclosure, those reviewing this disclosure will readily appreciate that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application. are possible (e.g. variations in size, scale, structure, shape and proportion of various elements, as well as parameter values (e.g. temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.). For example, an element shown as integrally formed may be constructed from multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operation and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the invention is not limited to particular embodiments, but extends to various modifications which still fall within the scope of the appended claims.

Furthermore, in order to provide a concise description of the exemplary embodiments, not all features of an actual implementation may be described (i.e., those features that are not relevant to the best mode presently contemplated for carrying out the invention, or that are not relevant to carrying out the invention) feature).

It is understood that numerous implementation-specific decisions may be made during the development of any actual implementation, as in any engineering or design project. Such a development effort might be complex and time consuming, but would be a routine undertaking of design, manufacture and production without undue experimentation to those of ordinary skill having the benefit of this disclosure .

It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solution of the present invention can be carried out. Modifications or equivalent substitutions without departing from the spirit and scope of the technical solution of the present invention shall be included in the scope of the claims of the present invention.

Claims (5)

1. A clamping device for monitoring equipment, characterized by: including, Camera (100), the camera (100) includes a main body (101) and a mounting plate (102), the main body (101) is fixedly connected to the mounting plate (102); and, Wind vane component (200), the wind vane component (200) is arranged on one side of the mounting plate (102), the weather vane component (200) includes a first turntable assembly (201), a second turntable assembly (202) and a rotating rod mechanism (203), the first turntable assembly (201) and the second turntable assembly (202) are both sleeved on the rotating rod mechanism (203), and the rotating rod mechanism (203) is connected to the side of the camera (100), The rotating rod mechanism (203) includes a vertical rod (203a), a bottom plate (203b) and a rotating wheel (203c). The rotating wheel (203c) is rotationally connected to the top of the vertical rod (203a). The vertical rod (203a) The other end is rotatably connected to the bottom plate (203b). The first turntable assembly (201) includes a first turntable mechanism (201a) and a clamping mechanism (201b). The first turntable mechanism (201a) is rotatably connected to the vertical rod (203a). ), one end of the clamping mechanism (201b) is connected to the first turntable mechanism (201a), and the other end of the clamping mechanism (201b) is connected to the mounting plate (102). The first turntable mechanism (201a) includes a third A disc (201a-1), a first throwing block (201a-2), a first spring (201a-3) and a first gear (201a-4), the first disc (201a-1) is rotationally connected On the vertical rod (203a), the first disk (201a-1) is provided with a number of first grooves (201a-11), and a number of first grooves (201a-11) are equidistantly distributed in the first circle. Outside the plate (201a-1), one end of the first throwing block (201a-2) is movably connected to the vertical rod (203a), and one side of the first throwing block (201a-2) is fixedly connected to the first spring (201a). -3), the other end of the first spring (201a-3) is fixedly connected to the vertical rod (203a), and the first gear (201a-4) is fixed on the lower end of the first disk (201a-1). 2. The clamping device for monitoring equipment according to claim 1, characterized in that: the clamping mechanism (201b) includes a first worm (201b-1), a buffer (201b-2) and a first nut ( 201b-3), the first worm (201b-1) meshes with the first gear (201a-4), the other end of the first worm (201b-1) is provided with an external thread, the first worm (201b) -1) The end far away from the first gear (201a-4) penetrates the buffer (201b-2), and the end far away from the first gear (201a-4) of the first worm (201b-1) is threadedly connected to the first nut (201b- 3). 3. The clamping device for monitoring equipment according to claim 2, characterized in that: the buffer member (201b-2) includes a squeeze plate (201b-21), a buffer spring (201b-22) and a rubber pad ( 201b-23), one end of the extrusion plate (201b-21) is fixedly connected to the rubber pad (201b-23), and the other end of the rubber pad (201b-23) is fixedly connected to the installation plate (102). The extrusion plate A buffer spring (201b-22) is provided between (201b-21) and the mounting plate (102). The bottom end of the squeeze plate (201b-21) is fixedly connected to the bottom plate (203b). The second turntable assembly (202 ) includes a second turntable mechanism (202a) and a protection mechanism (202b). The second turntable mechanism (202a) is rotatably connected to the vertical rod (203a). One end of the protection mechanism (202b) is connected to the second turntable mechanism (202a). )connect. 4. The clamping device for monitoring equipment according to claim 3, characterized in that the second turntable mechanism (202a) includes a second disc (202a-1), a second throwing block (202a-2), The second spring (202a-3) and the second gear (202a-4), the second disc (202a-1) is rotationally connected to the vertical rod (203a), the second disc (202a-1) There are a number of second grooves (202a-11) on the second disc (202a-11) equidistantly distributed inside the second disc (202a-1). The second throwing block (202a-2) One end is movably connected to the vertical rod (203a), one side of the second throwing block (202a-2) is fixedly connected to the second spring (202a-3), and the other end of the second spring (202a-3) is fixedly connected to the vertical rod (203a). On the vertical rod (203a), the second gear (202a-4) is fixed on the lower end of the second disc (202a-1). 5. The clamping device for monitoring equipment according to claim 4, characterized in that the protective mechanism (202b) includes a second worm (202b-1), a protective plate (202b-2), and a connecting rod (202b- 3) and the second nut (202b-4), the second worm (202b-1) meshes with the second gear (202a-4), and one end of the second worm (202b-1) is rotatably connected to the extrusion plate (201b-21), the bottom plate (203b) is provided with a chute, and the lower end of the protective plate (202b-2) is provided with a protrusion, and the protrusion is slidably connected to the bottom plate (203b) in the chute. The second nut (202b-4) is sleeved on the second worm (202b-1). The second worm (202b-1) is provided with an external thread. The second nut (202b-4) is connected to the second nut (202b-4). The second worm (202b-1) is threaded, one side of the second nut (202b-4) is fixedly connected to one end of the connecting rod (202b-3), and the other end of the connecting rod (202b-3) is fixedly connected to the protective plate ( 202b-2) One side.