Intelligent building monitoring device and monitoring method

Abstract

The present invention relates to the technical field of monitoring devices, and specifically to an intelligent building monitoring device and a monitoring method, comprising a fixed bracket, an outer shell installed on the fixed bracket, an equipment main body installed inside the outer shell, and a lens installed on the equipment main body; the outer wall of the equipment main body is relatively provided with an air outlet duct located below the lens, and the air outlet ends of the air outlet duct are arranged facing each other, and the air outlet duct can move in a vertical direction at the same time, and the air outlet duct is used to dry the outer wall of the lens; woolen yarn that fits the outer wall of the lens is commonly installed between the air outlet ducts, and the woolen yarn is used to clean adhesions on the outer wall of the lens; the top of the outer shell is equipped with a flippable top cover through a torsion spring shaft, and the top cover is used to clean snow accumulated on its top wall. Through the arrangement of the above structure, the woolen yarn in the present invention can wipe and clean adhesions such as fog and water droplets on the surface of the lens, thereby improving the clarity of the lens; at the same time, the woolen yarn is very small in thickness and will not cause a large blocking effect on the monitoring picture of the lens.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring devices, and in particular to an intelligent building monitoring device and a monitoring method. Background Art

[0002] As people's living standards improve, residential communities where people live are equipped with surveillance cameras to improve the safety of residents. The camera monitoring points are usually located at road intersections, important road sections, building entrances and exits, and community corners. Property staff can use the images captured by surveillance cameras to conduct real-time monitoring of various locations in the community to ensure the safety of residents.

[0003] However, in rainy and snowy areas, the outdoor temperature is relatively low, and the outer mirror surface of the surveillance camera is easily damp, frosted, and iced, thereby blocking the line of sight of the surveillance lens and the clarity of the surveillance image, thereby reducing the safety in the community; the existing method of directly scraping the obstruction of the lens with a scraper, firstly, when rainwater adheres to the lens and causes the lens to freeze, directly scraping it with a scraper is likely to cause ice to scratch the lens; secondly, the scraper cleaning process is likely to block the camera's surveillance line of sight. Summary of the Invention

[0004] The object of the present invention is to provide an intelligent building monitoring device and a monitoring method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an intelligent building monitoring device, comprising a fixed bracket, an outer shell installed on the fixed bracket, an equipment body installed inside the outer shell, and a lens installed on the equipment body; an outer wall of the equipment body is provided with an air outlet pipe located below the lens, and the air outlet ends of the air outlet pipe are arranged facing each other, the air outlet pipe can move in a vertical direction, and the air outlet pipe is used to dry the outer wall of the lens; wool yarn that fits the outer wall of the lens is installed between the air outlet pipes, and the wool yarn is used to clean adhesions on the outer wall of the lens; a top cover that can be flipped is installed on the top of the outer shell through a torsion spring shaft, and the top cover is used to clean snow accumulated on its top wall.

[0006] Preferably, a moisture-proof pill box is installed on the end surface of the outer shell, and the moisture-proof pill box is used to dry the gas discharged from the air outlet pipe.

[0007] Preferably, a U-shaped rod located on one side of the device body is radially installed inside the outer shell, and the bottom end of the piston block extends downward from the outer shell and is socketed with the output end of the motor; a piston block is provided inside the outer shell adjacent to the fixed bracket, and the circumferential outer wall of the piston block is tightly fitted to the inner wall of the outer shell, and the outer wall of the piston block facing the U-shaped rod is movably connected to the U-shaped part of the U-shaped rod through the piston connecting rod; a one-way intake valve is installed on the outer wall of the piston block throughout its thickness, and the input end of the one-way intake valve is connected to the inside of the device body through a hose, and a one-way exhaust valve is installed on the end face of the outer shell adjacent to the fixed bracket, and the one-way exhaust valve penetrates along the thickness of the outer shell to make the inside and outside of the outer shell communicate with each other, and the one-way exhaust valve is connected to the moisture-proof pill box and the air outlet pipe through a hose.

[0008] Preferably, the wool yarn is located on the air outlet path of the air outlet end of the air outlet pipe.

[0009] Preferably, a heat dissipation groove is provided at the top end of the outer shell along the thickness thereof, and the heat dissipation groove is always located between the piston block and the device body.

[0010] Preferably, two slide plates are vertically mounted on one end of the device body and are located outside the lens, and the top ends of the slide plates extend upward and contact the inner wall supported by the top cover.

[0011] Preferably, a slide groove is provided inside the slide plate along its vertical direction, and a slider is movably installed inside the slide groove; the air outlet pipe is fixedly installed on the slider; the top end of the slider is connected to a rope, and the other end of the rope extends out of the top end of the slide plate and is connected to the inner wall of the top cover; a return spring is installed inside the bottom end of the slide plate, and the top end of the return spring is connected to the bottom end of the slider.

[0012] Preferably, the top end of the U-shaped rod extends upward out of the top end of the equipment body, and a square plate is installed on the extended end; the top end of the equipment body is rotatably installed with a vertically arranged one-way rotating block, and the top end of the one-way rotating block is installed with a reciprocating transmission rod, and the outside of the reciprocating transmission rod is covered with a reciprocating moving block with a threaded fit, and the reciprocating moving block moves back and forth along the length of the reciprocating transmission rod, and a top rod is vertically installed on the outer wall of the reciprocating moving block, and the end of the top rod extends upward and conflicts with the inner wall of the top cover.

[0013] Preferably, the outer wall of the slide plate away from the device body is provided with multiple groups of lamp beads.

[0014] A monitoring method for an intelligent building monitoring device, comprising the following steps:

[0015] Step 1: Use external force to extract the hot air inside the device body and output it to the air outlet pipe to dry the moisture on the outer wall of the lens, remove moisture and defrost;

[0016] Step 2: Use a moisture-proof pill box to further dry the hot air discharged from the air outlet pipe, reducing the amount of humid hot air blowing towards the outer wall of the lens;

[0017] Step 3: In heavy snowy weather, the U-shaped rod is rotated in the opposite direction at a constant speed by external force, thereby driving the top cover to rotate intermittently on the top of the outer shell to remove the accumulated snow on the top;

[0018] Step 4: Use external force to make the wool move back and forth vertically and wipe the adhered objects on the outer wall of the lens.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention arranges a woolen thread. When the woolen thread is attached to the lens and moves vertically, the material of the woolen thread can wipe and clean fog, water droplets and other adherents on the lens surface, thereby improving the clarity of the lens. At the same time, the woolen thread is very thin and will not cause a large obstruction to the monitoring image of the lens. Furthermore, in case of strong wind, rain or snow weather, which causes the outer wall of the lens to become damp and iced, the contact area between the woolen thread and the lens is small, and the material of the woolen thread is relatively soft, so the movement of the woolen thread will not cause thin ice to scratch the outer wall of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 For the present invention Figure 1 Schematic diagram from another perspective;

[0023] Figure 3 Schematic diagram of the internal structure of the outer shell of the present invention;

[0024] Figure 4 For the present invention Figure 2 Schematic diagram of the local structure;

[0025] Figure 5 For the present invention Figure 2 The right side structural diagram of

[0026] Figure 6 For the present invention Figure 3 Schematic diagram from another perspective;

[0027] Figure 7 For the present invention Figure 6 Schematic diagram of the local structure;

[0028] Figure 8 This is a schematic diagram of another motion state of the top cover of the present invention;

[0029] Figure 9 For the present invention Figure 8 Schematic diagram of the structure at point A in .

[0030] In the figure: 1, fixed bracket; 101, outer shell; 102, device body; 103, lens;

[0031] 2. Heat sink; 201. U-shaped rod; 202. Piston block; 2021. One-way intake valve; 2022. One-way exhaust valve;

[0032] 3. Moisture-proof pill box;

[0033] 4. Slide plate; 401. Slider; 402. Air outlet pipe;

[0034] 5. Wool;

[0035] 6. Top cover; 601. One-way rotating block; 602. Reciprocating transmission rod; 603. Reciprocating moving block; 604. Top rod. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0039] Example 1:

[0040] like Figures 1 to 9As shown, this embodiment provides an intelligent building monitoring device, including a fixing bracket 1, an outer shell 101 mounted on the fixing bracket 1, a device body 102 mounted inside the outer shell 101, and a lens 103 mounted on the device body 102; the fixing bracket 1 is mounted on a road pole and a circuit is connected for monitoring use by the device body 102.

[0041] like Figure 3 、 Figure 2 and Figure 4 As shown, a U-shaped rod 201 located on one side of the device body 102 is radially installed inside the outer shell 101, and the bottom end of the piston block 202 extends downward from the outer shell 101 and is sleeved with the output end of the motor. The motor can drive the U-shaped rod 201 to rotate at a uniform speed; a piston block 202 is provided inside the outer shell 101 adjacent to the fixed bracket 1, and the circumferential outer wall of the piston block 202 is tightly fitted with the inner wall of the outer shell 101. The outer wall of the piston block 202 facing the U-shaped rod 201 is connected to the U-shaped rod 201 through the piston connecting rod. 01 is movably connected to the U-shaped portion; that is, the rotation of the U-shaped rod 201 can make the piston block 202 reciprocate inside the outer shell 101; because the outer wall of the piston block 202 is installed with a one-way air intake valve 2021 that penetrates its thickness, the input end of the one-way air intake valve 2021 is connected to the inside of the device body 102 through a hose, so when the piston block 202 moves toward the device body 102, the hot air inside the device body 102 can be drawn into the interval formed by the piston block 202 and the end surface of the outer shell 101, such as Figure 6 As shown; a one-way exhaust valve 2022 is installed on the end face of the outer shell 101 adjacent to the fixed bracket 1. The one-way exhaust valve 2022 penetrates the thickness of the outer shell 101 to make the inside and outside of the outer shell 101 communicate with each other. Therefore, when the piston block 202 moves toward the one-way exhaust valve 2022, the hot air drawn into the interval will be squeezed out from the one-way exhaust valve 2022. The one-way exhaust valve 2022 is connected to the air outlet pipe 402 through a hose, and the exhausted hot air can be transported to the air outlet pipe 402. The outer wall of the main body 102 is relatively provided with an air outlet duct 402 located below the lens 103. The hot air transported to the air outlet duct 402 can be discharged from the air outlet end of the air outlet duct 402, and the air outlet duct 402 is arranged relatively. The relative blowing of the two will cause the hot air to flow upward at the junction, and the density of the hot air is relatively small. When discharged from the air outlet duct 402, it can continue to flow upward and fully dry the outer wall of the lens 103, thereby reducing the situation where the outer wall of the lens 103 is frosted or iced when it is cold.

[0042] like Figure 1 and Figure 3As shown, a moisture-proof pill box 3 is installed on the end face of the outer shell 101, and the one-way exhaust valve 2022 is connected to the moisture-proof pill box 3 and the air outlet pipe 402 through a hose; that is, on the basis of the one-way exhaust valve 2022 continuously transporting the hot air inside the device main body 102 to the air outlet pipe 402, the gas will also pass through the interior of the moisture-proof pill box 3 during the transportation process. There are multiple moisture-proof pills placed inside the moisture-proof pill box 3. The moisture-proof pills are used to filter and dry the humid gas, further ensuring that the gas output by the air outlet pipe 402 is dry enough to avoid the low temperature of the lens 103 affected by the cold air. If the blown out is humid hot air, it will aggravate the fogging and frost on the outer wall of the lens 103. Therefore, the moisture-proof pill box 3 can further make the hot air blown by the air outlet pipe 402 keep the outer wall of the lens 103 dry, thereby improving the clarity of the monitoring screen of the device main body 102.

[0043] like Figure 1 、 Figure 6 、 Figure 7 、 Figure 8 and Figure 9 As shown, in heavy snow, the property staff can use the remote control to control the motor at the bottom of the outer shell 101 to drive the U-shaped rod 201 connected to its output shaft to reverse. Wireless remote control to make the motor rotate forward and reverse is a prior art and will not be described in detail here. The reverse uniform rotation of the U-shaped rod 201 does not affect the reciprocating movement of the piston block 202 inside the outer shell 101. Figure 7As shown, the top of the U-shaped rod 201 extends upward from the top of the equipment body 102, and the extended end is installed with a square plate; the top of the equipment body 102 is rotatably installed with a vertically arranged one-way rotating block 601, and the top of the one-way rotating block 601 is installed with a reciprocating transmission rod 602, and the outer sleeve of the reciprocating transmission rod 602 is provided with a reciprocating moving block 603 with a threaded fit, and the reciprocating moving block 603 reciprocates along the length direction of the reciprocating transmission rod 602, and the outer wall of the reciprocating moving block 603 is vertically installed with a push rod 604, and the end of the push rod 604 extends upward and contacts the inner wall of the top cover 6. At this time, the reverse rotation of the U-shaped rod 201 can drive the reciprocating transmission rod 602 to form a synchronous rotation motion. When the reciprocating transmission rod 602 rotates, the reciprocating moving block 603 can move along the reciprocating transmission rod 60 under the action of the limit rod slidably connected on one side. 2 reciprocates in opposite directions. The above is the prior art and will not be elaborated here. During the reciprocating movement of the reciprocating block 603 along the reciprocating transmission rod 602, the top rod 604 fixedly connected to the outer wall of the reciprocating block 603 will rise and fall synchronously. When rising, it can push the top cover 6 to rotate along the torsion spring shaft seat. When the top rod 604 falls, the top cover 6 is reset by its own gravity and the torsion in the torsion spring shaft seat. During the rotation of the top cover 6, it can not only reduce the accumulation of snow and prevent the entire equipment from being crushed, but also guide the snow accumulated on its top to fall. The direction of the snow falling is the position of the fixed bracket 1, which prevents the snow from falling from the front of the equipment body 102, thereby reducing the obstruction of the monitoring line of sight of the equipment body 102 during the falling process of snow, and further improving the real-time monitoring of the equipment body 102 on areas such as roads.

[0044] like Figure 8 、 Figure 5 and Figure 4As shown, one end of the device body 102 is vertically fixed with two slide plates 4 located on the outside of the lens 103, the top of the slide plate 4 extends upward and contacts the inner wall of the top cover 6; a slide groove is opened inside the slide plate 4 along its vertical direction, and a slider 401 is movably installed inside the slide groove; the air outlet pipe 402 is fixedly installed on the slider 401; the top of the slider 401 is connected to a rope, and the other end of the rope extends out of the top of the slide plate 4 and is connected to the inner wall of the top cover 6; a return spring is installed inside the bottom end of the slide plate 4, and the top end of the return spring is connected to the bottom end of the slider 401; that is, on the basis of the rotation of the top cover 6 on the torsion spring shaft seat, the rotation of the top cover 6 can also drive the air outlet pipe 402 and the slider 401 to slide inside the slide plate 4 through the rope, and when the top cover 6 is reset, the slider 401 is reset through its return spring connection with the bottom end of the slide plate 4 The position of the positioning spring is reset, and the air outlet pipe 402 can be discharged through its air outlet end during the movement, and the outer wall of the lens 103 can be further dried; at the same time, the movement of the slider 401 and the air outlet pipe 402 can also drive the woolen thread 5 that is tightly attached to the outer wall of the lens 103 to move synchronously, and the outer wall of the lens 103 is cleaned by the woolen thread 5; the difference from the existing scraper is that the material of the woolen thread 5 can wipe and clean the fog, water droplets and other adhesions on the surface of the lens 103, thereby improving the clarity of the lens 103; at the same time, the thickness of the woolen thread 5 is very small and will not cause a large obstruction to the monitoring image of the lens 103; furthermore, in case of strong wind, rain and snow weather, which causes the outer wall of the lens 103 to become damp and iced, the contact area between the woolen thread 5 and the lens 103 is small, and its material is relatively soft, so the movement of the woolen thread 5 will not drive thin ice to scratch the outer wall of the lens 103.

[0045] like Figure 5 As shown, the wool yarn 5 is located on the air outlet path of the air outlet end of the air outlet pipe 402. The continuous air outlet of the air outlet pipe 402 can dry the surface of the wool yarn 5, so that the surface of the wool yarn 5 remains dry, which facilitates the wool yarn 5 to clean moisture, water droplets and other adhesions on the outer wall of the lens 103.

[0046] like Figure 6 and Figure 8 As shown, a heat dissipation groove 2 is provided at the top of the outer shell 101 along its thickness, and the heat dissipation groove 2 is always located between the piston block 202 and the device body 102; the heat emitted by the device body 102 can be discharged to the outside of the outer shell 101 through the heat dissipation groove 2; on the basis of the uniform reciprocating movement of the piston block 202, when the piston block 202 moves back and forth inside the outer shell 101, the movement of the piston block 202 can accelerate the flow of air inside the outer shell 101, so as to facilitate the discharge of the hot air emitted by the device body 102 from the heat dissipation groove 2, thereby improving the heat dissipation effect.

[0047] like Figure 4Vegetarian, the outer wall of the slide plate 4 away from the device body 102 is provided with multiple groups of lamp beads, the lamp beads are connected by a lamp belt, and the lamp belt is electrically connected to the external wire. The illumination of the light can enhance the brightness of the monitored area and the lighting of the road, providing convenience for the residents.

[0048] A monitoring method for an intelligent building monitoring device, comprising the following steps:

[0049] Step 1: Use external force to extract the hot air inside the device body 102 and output it to the air outlet pipe 402 to dry the outer wall of the lens 103, remove moisture and defrost;

[0050] Step 2: The hot air discharged from the air outlet pipe 402 is further dried by the moisture-proof pill box 3 to reduce the amount of hot air with humidity blowing toward the outer wall of the lens 103;

[0051] Step 3: In heavy snowy weather, the U-shaped rod 201 is rotated in the opposite direction at a constant speed by external force, thereby driving the top cover 6 to rotate intermittently on the top of the outer shell 101 to remove the snow accumulated on the top;

[0052] Step 4: Use external force to make the yarn 5 move back and forth vertically and wipe the adhered matter on the outer wall of the lens 103.

[0053] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An intelligent building monitoring device, comprising a fixing bracket (1), an outer shell (101) mounted on the fixing bracket (1), a device body (102) mounted inside the outer shell (101), and a lens (103) mounted on the device body (102); It is characterized in that An air outlet pipe (402) is provided on the outer wall of the device body (102) and is located below the lens (103), and the air outlet ends of the air outlet pipe (402) are arranged facing each other. The air outlet pipe (402) can move in a vertical direction, and the air outlet pipe (402) is used to dry the outer wall of the lens (103); A woolen thread (5) that fits the outer wall of the lens (103) is installed between the air outlet pipes (402), and the woolen thread (5) is used to clean the adhered matter on the outer wall of the lens (103); A top cover (6) capable of flipping movement is installed on the top of the outer shell (101) via a torsion spring shaft, and the top cover (6) is used to clear snow accumulated on the top wall thereof; A U-shaped rod (201) located on one side of the device body (102) is radially installed inside the outer shell (101); The top end of the U-shaped rod (201) extends upward from the top end of the device body (102), and a square plate is installed at the extended end; a vertically arranged one-way rotating block (601) is rotatably installed at the top end of the device body (102), a reciprocating transmission rod (602) is installed at the top end of the one-way rotating block (601), a threaded reciprocating block (603) is sleeved on the outside of the reciprocating transmission rod (602), and the reciprocating block (603) moves back and forth along the length direction of the reciprocating transmission rod (602), a push rod (604) is vertically installed on the outer wall of the reciprocating block (603), and the end of the push rod (604) extends upward and contacts the inner wall of the top cover (6).

2. The intelligent building monitoring device according to claim 1, characterized in that: A moisture-proof pill box (3) is installed on the end surface of the outer shell (101), and the moisture-proof pill box (3) is used to dry the gas discharged from the air outlet pipe (402).

3. The intelligent building monitoring device according to claim 2, characterized in that: The bottom end of the piston block (202) extends downward out of the outer shell (101) and is sleeved with the output end of the motor; a piston block (202) is provided inside the outer shell (101) adjacent to the fixed bracket (1); the circumferential outer wall of the piston block (202) is tightly fitted with the inner wall of the outer shell (101); the outer wall of the piston block (202) facing the U-shaped rod (201) is movably connected to the U-shaped portion of the U-shaped rod (201) through the piston connecting rod; the outer wall of the piston block (202) is provided with a A one-way air intake valve (2021) is provided, wherein the input end of the one-way air intake valve (2021) is communicated with the interior of the device body (102) through a hose, and a one-way exhaust valve (2022) is installed on the end face of the outer shell (101) adjacent to the fixed bracket (1). The one-way exhaust valve (2022) penetrates along the thickness of the outer shell (101) so that the inside and outside of the outer shell (101) are communicated with each other, and the one-way exhaust valve (2022) is communicated with the moisture-proof pill box (3) and the air outlet pipe (402) through a hose.

4. The intelligent building monitoring device according to claim 3, characterized in that: The wool yarn (5) is located on the air outlet path of the air outlet end of the air outlet pipe (402).

5. The intelligent building monitoring device according to claim 3, characterized in that: A heat dissipation groove (2) is provided at the top end of the outer shell (101) along its thickness, and the heat dissipation groove (2) is always located between the piston block (202) and the device body (102).

6. The intelligent building monitoring device according to claim 1, characterized in that: Two slide plates (4) located outside the lens (103) are vertically mounted on one end of the device body (102), and the top ends of the slide plates (4) extend upward and contact the inner wall supported by the top cover (6).

7. The intelligent building monitoring device according to claim 6, characterized in that: A slide groove is provided inside the slide plate (4) along its vertical direction, and a slider (401) is movably installed inside the slide groove; the air outlet pipe (402) is fixedly installed on the slider (401); the top end of the slider (401) is connected to a rope, and the other end of the rope extends out of the top end of the slide plate (4) and is connected to the inner wall of the top cover (6); a return spring is installed inside the bottom end of the slide plate (4), and the top end of the return spring is connected to the bottom end of the slider (401).

8. The intelligent building monitoring device according to claim 6, characterized in that: The outer wall of the chute plate (4) away from the device body (102) is provided with multiple groups of lamp beads.

9. A monitoring method for an intelligent building monitoring device, applied to the intelligent building monitoring device according to any one of claims 1 to 8, characterized in that: Here are the steps: Step 1: Using external force, the hot air inside the device body (102) is extracted and output to the air outlet pipe (402) to dry the outer wall of the lens (103), remove moisture and defrost; Step 2: The hot air discharged from the air outlet pipe (402) is further dried through the moisture-proof pill box (3), thereby reducing the amount of hot air with humidity that is blown toward the outer wall of the lens (103); Step 3: In heavy snowy weather, the U-shaped rod (201) is rotated in the reverse direction at a constant speed by external force, thereby driving the top cover (6) to rotate intermittently on the top of the outer shell (101) to remove the snow accumulated on the top; Step 4: Use external force to make the yarn (5) move back and forth vertically and wipe the adhered matter on the outer wall of the lens (103).

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