Security monitoring device

Abstract

The invention discloses a security monitoring device, relates to the technical field of monitoring, and solves the problems that different detection lenses cannot be selected according to the external environment, so that the definition is influenced in some environments, and the lens on the outermost layer is contaminated with dirt along with the increase of the use time, so that the eyesight is influenced. The security monitoring device comprises a monitoring device body, a multi-environment adaptation mechanism is fixedly installed on one side of the lower end face of the monitoring device body, a lens groove is formed in the middle of the rear end face of the monitoring device body, and a plurality of circles of lenses are arranged on the inner wall of the front end of the lens groove. Through the multi-environment adaptation mechanism, the equipment can exchange different monitoring lenses according to the external environment, so that the adaptability of the equipment is ensured, the outermost lens can be automatically cleaned in the lens exchange process, and the situation that the eyes of the equipment are obstructed due to dirt or foreign matter is avoided.

Description

Technical Field

[0001] This invention relates to the field of surveillance technology, specifically a security monitoring device. Background Technology

[0002] With the development of technology, security work has penetrated into every household. Every place needs security work to strengthen crime prevention. An indispensable part of security projects is the installation of surveillance cameras. Surveillance cameras are quasi-cameras used in security. Their pixels and resolution are higher than those of a computer video camera but lower than those of a professional digital camera. Most surveillance cameras are just simple video capture devices and rarely have data storage functions. Such surveillance cameras used in security projects can be called a security monitoring device.

[0003] However, existing security monitoring devices have drawbacks. To ensure a wider field of view, they are installed in open areas, and the monitoring equipment is mounted on top of a support structure. This high position exposes the equipment to sun and rain, requiring regular maintenance after a period of use. However, the height of the equipment necessitates maintenance personnel climbing to the top of the support structure for inspection, which is inconvenient and potentially dangerous. Patent number CN115930064A, entitled "A Stably Installed Security Monitoring Device," solves these problems by using a lifting mechanism to adjust the height of the movable component, thereby changing the height of the monitoring component. This allows maintenance personnel to repair the monitoring component from the ground, making maintenance more convenient and reducing maintenance risks.

[0004] However, this new type of security monitoring device cannot change its monitoring lens according to the brightness of the external environment. When the brightness of the external environment is high or low, it will affect the clarity of its video. In addition, as the usage time increases, dirt will inevitably accumulate on the outermost lens, thus affecting its vision. Therefore, it does not meet the existing needs. In response, we have proposed a security monitoring device. Summary of the Invention

[0005] The purpose of this invention is to provide a security monitoring device to solve the problems of the novel security monitoring device proposed in the background art, which cannot change its monitoring lens according to the brightness of the external environment. When the brightness of the external environment is high or low, it will affect the clarity of its video. In addition, as the usage time increases, dirt will inevitably accumulate on the outermost lens, thereby affecting its vision.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a security monitoring device, comprising a monitoring device body, wherein multiple environmental adaptation mechanisms are fixedly installed on one side of the lower end face of the monitoring device body, a lens groove is provided at the middle position of the rear end face of the monitoring device body, multiple rings of lenses are provided on the inner wall of the front end of the lens groove, a protective lens is provided inside the lens groove near the rear end face of the monitoring device body, and an automatic cleaning mechanism is provided below the protective lens.

[0007] The multi-environmental adaptation mechanism includes a filter lens, a light-enhancing lens, a polarizing lens, and a drive conversion mechanism. The drive conversion mechanism can arbitrarily select a filter lens, a light-enhancing lens, or a polarizing lens and drive the selected lens to rotate 180 degrees and fix it.

[0008] The automatic cleaning mechanism includes a transmission mechanism and a cleaning concave plate. The drive conversion mechanism on the multi-environmental adaptation mechanism can drive the transmission mechanism, thereby causing the cleaning concave plate to move up and down cyclically on the rear end surface of the protective lens.

[0009] Preferably, the drive conversion mechanism includes a metal shell, a stepper motor, a storage slot, an arc-shaped counterweight, a transmission shaft, a square sleeve, a reset plate, an annular groove, an anti-detachment rod, a spring, an inner square groove sleeve, a push plate, a single-bar cylinder, a metal sleeve, a limit rod, a 180-degree limit groove, an internal threaded through hole, a bevel gear A, a gear shaft, a synchronous sprocket A, a synchronous sprocket B, a synchronous shaft, a fixing screw, a bevel gear B, a large synchronous wheel, and a synchronous chain A. The stepper motor is fixedly installed on one side inside the metal shell, and the output shaft of the stepper motor is connected to the transmission shaft through a coupling.

[0010] Preferably, a storage groove is provided at the middle position of the inner wall at the lower end of the lens groove and on both sides near the middle position. Each of the three storage grooves is provided with a square sleeve fixedly fitted on the outer surface of the transmission shaft. A reset plate is provided on the outer side of the square sleeve. An annular groove is provided in front of the reset plate. Two anti-disengagement rods are symmetrically fixed on both sides of the front end face of the reset plate, and both are movable and inserted into the annular groove. A spring is fitted on the outer surface of the anti-disengagement rod.

[0011] Preferably, the first storage slot from left to right is equipped with a polarizing lens, the second storage slot from left to right is equipped with a light-enhancing lens, and the third storage slot from left to right is equipped with a filter lens. An arc-shaped counterweight is fixed to the lower end face of each of the filter lens, light-enhancing lens, and polarizing lens. An inner square slot is fixed to the upper end face of each of the filter lens, light-enhancing lens, and polarizing lens. The three inner square slots are located behind the three reset plates, and the shape of the inner wall of the inner square slot matches the shape of the square sleeve. A push plate is connected to the rear end face of the inner square slot via a roller bearing. Two single-cylinder cylinders installed inside a metal casing are symmetrically connected to both sides of the rear end face of the push plate.

[0012] Preferably, a metal sleeve is fixedly fitted on the outer surface of the transmission shaft near the first receiving groove from left to right. A 180-degree limiting groove is provided on the outer side of the metal sleeve. A limiting rod located inside the 180-degree limiting groove is fixedly provided at the middle position of the lower end face of the metal sleeve. An internal threaded through hole is provided on the outer surface of the limiting rod near the bottom end.

[0013] Preferably, one side of the metal sleeve is provided with a bevel gear B fixedly sleeved on the outer surface of the transmission shaft. The bevel gear B meshes with a bevel gear A. The shaft of the bevel gear A is connected to a gear shaft. A synchronous sprocket A is fixedly sleeved on one side of the outer surface of the gear shaft. A synchronous sprocket B is provided above and below the synchronous sprocket A. The shaft of the synchronous sprocket B is connected to a synchronous shaft. A fixing screw is fixedly provided on the face of the synchronous shaft facing the limiting rod. The first fixing screw from top to bottom is inserted into the interior of the internal threaded through hole. The two synchronous sprockets B and the synchronous sprocket A are connected in series by a synchronous chain A.

[0014] Preferably, the transmission mechanism includes a small synchronous pulley, a synchronous chain B, a sprocket shaft, a bevel gear A, a bevel gear B, and a threaded rod. The threaded rod vertically passes through one end of the clean concave plate and is threadedly connected to it. The bevel gear B is fixedly sleeved on the lower side of the outer surface of the threaded rod. The bevel gear B meshes with the bevel gear A. The sprocket shaft is connected to the axis of the bevel gear A. The small synchronous pulley is fixedly sleeved on one side of the outer surface of the sprocket shaft.

[0015] The cleaning concave plate has cleaning cotton on the side facing the protective lens.

[0016] Preferably, a large synchronous wheel is fixedly fitted on the outer surface of the transmission shaft near the small synchronous wheel, and the large synchronous wheel and the small synchronous wheel are connected in series by a synchronous chain B.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. This invention, during periods of high summer temperatures, allows the polarizing lens to be moved into the lens slot via a multi-environmental adaptation mechanism. When the lens monitors the external environment through the polarizing lens, irregular light from all directions can be filtered out, thereby improving the contrast and sharpness of objects in the video. When the external environment is dark, the light-enhancing lens can be moved into the lens slot. When the lens monitors the external environment through the light-enhancing lens, the contrast can be increased, enhancing the effect of ambient light. When the external environment is bright, the filter lens can be moved into the lens slot. When the lens monitors the external environment through the filter lens, different levels of light can be effectively reduced, thereby increasing clarity. Through the above technical solutions, the clarity of the monitoring device is guaranteed in different environments.

[0019] 2. When the multi-environmental adaptation mechanism is activated to change the lens, the cleaning concave plate inside the automatic cleaning mechanism will move up and down. As the cleaning concave plate moves, the cleaning cotton on the cleaning concave plate will rub against the outside-facing surface of the protective lens, thereby cleaning it. The above technical solution can prevent dirt or foreign objects from obstructing the vision of the monitoring device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a side view of the overall internal structure of the present invention;

[0022] Figure 3 For the present invention Figure 2 Enlarged view of the structure at point A in the middle;

[0023] Figure 4 For the present invention Figure 3 Enlarged view of the structure at point C;

[0024] Figure 5 For the present invention Figure 3 A schematic diagram of the automatic cleaning mechanism at point D;

[0025] Figure 6 For the present invention Figure 3 Side view of the internal structure in the middle.

[0026] In the diagram: 1. Monitoring device body; 2. Multi-environmental adaptation mechanism; 201. Metal casing; 202. Stepper motor; 203. Storage slot; 204. Filter lens; 205. Brightness enhancement lens; 206. Polarizing lens; 207. Arc-shaped counterweight; 208. Transmission shaft; 209. Square sleeve; 210. Reset plate; 211. Annular groove; 212. Anti-detachment rod; 213. Spring; 214. Inner square groove sleeve; 215. Push plate; 216. Single-bar cylinder; 217. Metal sleeve; 218. Limiting rod; 219. 180-degree limiting groove; 20. Internal threaded through hole; 221. Bevel gear A; 222. Gear shaft; 223. Synchronous sprocket A; 224. Synchronous sprocket B; 225. Synchronous shaft; 226. Fixing screw; 227. Bevel gear B; 228. Large synchronous pulley; 229. Synchronous chain A; 3. Lens groove; 4. Lens; 5. Protective lens; 6. Automatic cleaning mechanism; 601. Small synchronous pulley; 602. Synchronous chain B; 603. Sprocket shaft; 604. Bevel gear A; 605. Bevel gear B; 606. Threaded rod; 607. Cleaning concave plate. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] Please see Figures 1 to 6 An embodiment of the present invention provides a security monitoring device, including a monitoring device body 1, a multi-environmental adaptation mechanism 2 fixedly installed on one side of the lower end face of the monitoring device body 1, a lens groove 3 provided in the middle of the rear end face of the monitoring device body 1, a multi-ring lens 4 provided on the inner wall of the front end of the lens groove 3, a protective lens 5 provided inside the lens groove 3 near the rear end face of the monitoring device body 1, and an automatic cleaning mechanism 6 provided below the protective lens 5.

[0029] The multi-environmental adaptation mechanism 2 includes a filter lens 204, a light-enhancing lens 205, a polarizing lens 206, and a drive conversion mechanism. The drive conversion mechanism can arbitrarily select the filter lens 204, the light-enhancing lens 205, or the polarizing lens 206 and drive the selected lens to rotate 180 degrees and fix it.

[0030] The automatic cleaning mechanism 6 includes a transmission mechanism and a cleaning concave plate 607. The transmission mechanism can be driven by the drive conversion mechanism on the multi-environmental adaptation mechanism 2, so that the cleaning concave plate 607 can move up and down cyclically on the rear end surface of the protective lens 5.

[0031] Furthermore, the drive conversion mechanism includes a metal housing 201, a stepper motor 202, a storage slot 203, an arc-shaped counterweight 207, a transmission shaft 208, a square sleeve 209, a reset plate 210, an annular groove 211, an anti-detachment rod 212, a spring 213, an inner square groove sleeve 214, a push plate 215, a single-cylinder cylinder 216, a metal sleeve 217, a limit rod 218, a 180-degree limit groove 219, an internal threaded through hole 220, a bevel gear A 221, a gear shaft 222, a synchronous sprocket A 223, a synchronous sprocket B 224, a synchronous shaft 225, a fixing screw 226, a bevel gear B 227, a large synchronous pulley 228, and a synchronous chain. A229, a stepper motor 202 is fixedly installed on one side inside the metal casing 201. The output shaft of the stepper motor 202 is connected to a transmission shaft 208 via a coupling. A storage slot 203 is provided at the middle position and on both sides near the middle position of the lower inner wall of the lens slot 3. Each of the three storage slots 203 has a square sleeve 209 fixedly fitted onto the outer surface of the transmission shaft 208. A reset plate 210 is provided on the outside of the square sleeve 209. An annular groove 211 is provided in front of the reset plate 210. Two anti-disengagement rods 212 are symmetrically fixed on both sides of the front end face of the reset plate 210, each movable and engaging inside the annular groove 211. The outer surface of the anti-disengagement rods 212 is fitted with... There is a spring 213; the first storage slot 203 from left to right contains a polarizing lens 206, the second storage slot 203 from left to right contains a brightness enhancement lens 205, and the third storage slot 203 from left to right contains a filter lens 204. An arc-shaped counterweight 207 is fixed to the lower end face of each of the filter lens 204, brightness enhancement lens 205, and polarizing lens 206. An inner square slot 214 is fixed to the upper end face of each of the filter lens 204, brightness enhancement lens 205, and polarizing lens 206. The three inner square slots 214 are located behind the three reset plates 210, and the shape of the inner wall of the inner square slot 214 is similar to that of the square sleeve 210. The shape of 09 matches, and the rear end face of the inner square groove sleeve 214 is connected to the push plate 215 through the roller bearing. Two single cylinders 216 installed inside the metal shell 201 are symmetrically connected to both sides of the rear end face of the push plate 215. A metal sleeve 217 is fixedly fitted on the outer surface of the transmission shaft 208 near the first storage groove 203 from left to right. A 180-degree limiting groove 219 is provided on the outer side of the metal sleeve 217. A limiting rod 218 located inside the 180-degree limiting groove 219 is fixedly provided at the middle position of the lower end face of the metal sleeve 217. An internal threaded through hole 220 is provided on the outer surface of the limiting rod 218 near the bottom.A bevel gear B227 is fixedly fitted onto the outer surface of the transmission shaft 208 on one side of the metal sleeve 217. The bevel gear B227 meshes with a bevel gear A221. A gear shaft 222 is connected to the axis of the bevel gear A221. A synchronous sprocket A223 is fixedly fitted onto one side of the outer surface of the gear shaft 222. A synchronous sprocket B224 is located above and below the synchronous sprocket A223. A synchronous shaft 225 is connected to the axis of the synchronous sprocket B224. A fixing screw 226 is fixedly installed on the synchronous shaft 225 facing the limiting rod 218. The first fixing screw 226 from top to bottom is inserted into the internal threaded through hole 220. The two synchronous sprockets B224 and the synchronous sprocket A223 are connected in series via a synchronous chain A229.

[0032] Working principle: During use, check the operation of each mechanism, move the device to the working area, and connect the power supply. When the ambient brightness is low and the lens 4 needs to use the brightness enhancement lens 205 to monitor the ambient environment, the inner square slot 214 located on the upper surface of the brightness enhancement lens 205 will be pushed forward by the single-cylinder cylinder 216 indirectly connected to it through the push plate 215. As the single-cylinder cylinder 216 moves, the inner square slot 214 will be fitted onto the square sleeve 209. During this process, the reset plate 210 is pushed and the spring 213 is squeezed. After the inner square slot 214 is fitted onto the reset plate 210, the stepper motor 202 starts and drives the transmission shaft 208 and the three square sleeves 209 fixedly fitted on the transmission shaft 208 to rotate. After the square sleeves 209 with the inner square slot 214 fitted on their outer surface have rotated 180 degrees, the brightness enhancement lens 205 will enter the interior of the lens slot 3 and be on the same horizontal line as the multiple lenses 4. At this time, the multiple Lens 4 monitors the external environment through a light-enhancing lens 205. When the light-enhancing lens 205 needs to be removed, the stepper motor 202 drives the square sleeve 209 to rotate 180 degrees in the opposite direction. The spring force of the compressed spring 213 pushes the inner square sleeve 214 and the light-enhancing lens 205, which is fixed to the inner square sleeve 214, back to their original positions. The weight of the arc-shaped counterweight 207 located on the lower end face of the polarizing lens 206 ensures that the directional groove on the inner wall of the inner square sleeve 214 and the square sleeve 209 maintain a corresponding state. During the high-temperature period in summer, the polarizing lens 206 can be moved into the lens slot 3 through the multi-environment adaptation mechanism 2. When the external ambient brightness is high, the filter lens 204 can be moved into the lens slot 3. Through the above technical solutions, the device can select and use different lenses according to different external environments, thereby ensuring its clarity and improving its flexibility.

[0033] Furthermore, the transmission mechanism includes a small synchronous pulley 601, a synchronous chain B602, a sprocket shaft 603, a bevel gear A604, a bevel gear B605, and a threaded rod 606. The threaded rod 606 vertically penetrates one end of the clean concave plate 607 and is threadedly connected to it. The bevel gear B605 is fixedly sleeved on the lower side of the outer surface of the threaded rod 606. The bevel gear B605 meshes with the bevel gear A604. The sprocket shaft 603 is connected to the axis of the bevel gear A604. The small synchronous pulley 601 is fixedly sleeved on one side of the outer surface of the sprocket shaft 603.

[0034] The surface of the cleaning concave plate 607 facing the protective lens 5 is provided with cleaning cotton; a large synchronous wheel 228 is fixedly sleeved on the outer surface of the transmission shaft 208 near the small synchronous wheel 601, and the large synchronous wheel 228 and the small synchronous wheel 601 are connected in series by a synchronous chain B602.

[0035] When the multi-environmental adaptation mechanism 2 is activated to rotate the transmission shaft 208 to change the lens, the large synchronous wheel 228 fixedly sleeved on the transmission shaft 208 and the small synchronous wheel 601 connected in series with the large synchronous wheel 228 via the synchronous chain B602 will rotate synchronously. When the small synchronous wheel 601 rotates, the sprocket shaft 603 connected to this small synchronous wheel 601 and the bevel gear A604 fixedly sleeved on the sprocket shaft 603 will rotate together. When the bevel gear A604 rotates, the corresponding... The meshing bevel gear B605 and the threaded rod 606 connected to the bevel gear B605 will rotate together. When the threaded rod 606 rotates, the cleaning concave plate 607, which is threadedly connected to it but cannot rotate on its own, will move up and down with the rotation of the threaded rod 606. As the cleaning cotton on the bevel gear A604 rubs against the protective lens 5, it can be cleaned. Through the above technical solution, the situation where dirt or foreign objects obstruct the vision of the monitoring device body 1 can be prevented.

[0036] As the transmission shaft 208 rotates, the metal sleeve 217 fixedly fitted onto it also rotates. Since the limiting rod 218 on the metal sleeve 217 is located inside the 180-degree limiting groove 219, and the maximum angle of the 180-degree limiting groove 219 is 180 degrees, the transmission shaft 208 can rotate at most half a turn. This technical solution ensures that the replaced lens can be accurately aligned with the lens 4. During the rotation of the transmission shaft 208, the bevel gear B227 fixed to it and the bevel gear A221 meshing with it also rotate. When the bevel gear A221 rotates, the gear shaft 222 connected to the shaft of the bevel gear A221 and the synchronous sprocket A223 fixedly fitted onto the gear shaft 222 also rotate. When the synchronous sprocket A223 rotates, the two gears connected to it via the synchronous chain A229 rotate in series. The synchronous sprocket B224 will also rotate. When the synchronous sprocket B224 rotates, the synchronous shaft 225 connected to the axis of the synchronous sprocket B224 and the fixing screw 226 fixed to the synchronous shaft 225 will also rotate. When the lens is put into the lens slot 3, the fixing screw 226 located below and threaded into the internal thread through hole 220 will leave the internal thread through hole 220. When the limit rod 218 rotates 180 degrees, the fixing screw 226 located above will enter the internal thread through hole 220. When the lens is retrieved, the opposite is true. After the fixing screw 226 enters the internal thread through hole 220, the limit rod 218 can be fixed in this position to prevent the transmission shaft 208 from rotating. This prevents the lens from becoming misaligned under the influence of the external environment during the use of the filter lens 204, the light enhancement lens 205, or the polarizing lens 206.

[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A security monitoring device, comprising a monitoring device body (1), characterized in that: A multi-environmental adaptation mechanism (2) is fixedly installed on one side of the lower end face of the monitoring device body (1). A lens groove (3) is provided in the middle of the rear end face of the monitoring device body (1). A multi-ring lens (4) is provided on the inner wall of the front end of the lens groove (3). A protective lens (5) is provided inside the lens groove (3) near the rear end face of the monitoring device body (1). An automatic cleaning mechanism (6) is provided below the protective lens (5). The multi-environmental adaptation mechanism (2) includes a filter lens (204), a light-enhancing lens (205), a polarizing lens (206), and a drive conversion mechanism. The drive conversion mechanism can arbitrarily select the filter lens (204), the light-enhancing lens (205), or the polarizing lens (206) and drive the selected lens to rotate 180 degrees and fix it. The automatic cleaning mechanism (6) includes a transmission mechanism and a cleaning concave plate (607). The transmission mechanism can be driven by the drive conversion mechanism on the multi-environmental adaptation mechanism (2), so that the cleaning concave plate (607) moves up and down cyclically on the rear end surface of the protective lens (5).

2. The security monitoring device according to claim 1, characterized in that: The drive conversion mechanism includes a metal shell (201), a stepper motor (202), a storage slot (203), an arc-shaped counterweight (207), a transmission shaft (208), a square sleeve (209), a reset plate (210), an annular groove (211), an anti-detachment rod (212), a spring (213), an inner square groove sleeve (214), a push plate (215), a single-cylinder cylinder (216), a metal sleeve (217), a limit rod (218), a 180-degree limit groove (219), and an inner screw. The metal housing (201) includes a through hole (220), a bevel gear A (221), a gear shaft (222), a synchronous sprocket A (223), a synchronous sprocket B (224), a synchronous shaft (225), a fixing screw (226), a bevel gear B (227), a large synchronous pulley (228), and a synchronous chain A (229). A stepper motor (202) is fixedly installed on one side inside the metal housing (201). The output shaft of the stepper motor (202) is connected to a transmission shaft (208) through a coupling.

3. A security monitoring device according to claim 2, characterized in that: A storage slot (203) is provided at the middle position of the inner wall of the lower end of the lens slot (3) and on both sides near the middle position. A square sleeve (209) is fixedly sleeved on the outer surface of the transmission shaft (208) inside each of the three storage slots (203). A reset plate (210) is provided on the outer side of the square sleeve (209). An annular groove (211) is provided in front of the reset plate (210). Two anti-disengagement rods (212) are symmetrically fixed on both sides of the front end face of the reset plate (210) and are movable and inserted into the annular groove (211). A spring (213) is sleeved on the outer surface of the anti-disengagement rod (212).

4. A security monitoring device according to claim 3, characterized in that: The first storage slot (203) from left to right contains a polarizing lens (206), the second storage slot (203) from left to right contains a brightness enhancement lens (205), and the third storage slot (203) from left to right contains a filter lens (204). Each of the filter lens (204), brightness enhancement lens (205), and polarizing lens (206) has a fixed arc-shaped counterweight (207) on its lower end face. Each of the three inner square slots (214) is fixedly provided on the upper end face of the plate (206). The three inner square slots (214) are located behind the three reset plates (210) respectively. The shape of the inner wall of the inner square slot (214) matches the shape of the square sleeve (209). The rear end face of the inner square slot (214) is connected to a push plate (215) through a roller bearing. Two single cylinders (216) installed inside the metal shell (201) are symmetrically connected on both sides of the rear end face of the push plate (215).

5. A security monitoring device according to claim 3, characterized in that: A metal sleeve (217) is fixedly fitted on the outer surface of the transmission shaft (208) near the first receiving groove (203) from left to right. A 180-degree limiting groove (219) is provided on the outer side of the metal sleeve (217). A limiting rod (218) located inside the 180-degree limiting groove (219) is fixedly provided at the middle position of the lower end face of the metal sleeve (217). An internal threaded through hole (220) is provided on the outer surface of the limiting rod (218) near the bottom end.

6. A security monitoring device according to claim 5, characterized in that: One side of the metal sleeve (217) is provided with a bevel gear B (227) fixedly sleeved on the outer surface of the transmission shaft (208). The bevel gear B (227) meshes with a bevel gear A (221). The shaft of the bevel gear A (221) is connected to a gear shaft (222). One side of the outer surface of the gear shaft (222) is fixedly sleeved with a synchronous sprocket A (223). A synchronous sprocket A (223) is provided above and below the synchronous sprocket A (223). A sprocket B (224) is connected to a synchronous rotating shaft (225) at its axis. A fixing screw (226) is fixed on the face of the synchronous rotating shaft (225) facing the limiting rod (218). The first fixing screw (226) from top to bottom is inserted into the interior of the internal thread through hole (220). The two synchronous sprockets B (224) and synchronous sprocket A (223) are connected in series by a synchronous chain A (229).

7. A security monitoring device according to claim 2, characterized in that: The transmission mechanism includes a small synchronous pulley (601), a synchronous chain B (602), a sprocket shaft (603), a bevel gear A (604), a bevel gear B (605), and a threaded rod (606). The threaded rod (606) vertically penetrates one end of the clean concave plate (607) and is threadedly connected to it. The bevel gear B (605) is fixedly sleeved on the lower side of the outer surface of the threaded rod (606). The bevel gear B (605) meshes with the bevel gear A (604). The sprocket shaft (603) is connected to the axis of the bevel gear A (604). The small synchronous pulley (601) is fixedly sleeved on one side of the outer surface of the sprocket shaft (603). The cleaning concave plate (607) has cleaning cotton on the side facing the protective lens (5).

8. A security monitoring device according to claim 7, characterized in that: A large synchronous wheel (228) is fixedly sleeved on the outer surface of the transmission shaft (208) near the small synchronous wheel (601). The large synchronous wheel (228) and the small synchronous wheel (601) are connected in series by a synchronous chain B (602).

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