Pollutant intercepting device for water inlet of storage pond

Abstract

The invention relates to the technical field of water inlets of regulation and storage ponds, and provides a pollutant intercepting device for a water inlet of a regulation and storage pond, the pollutant intercepting device comprises a protective shell, the side surface of the protective shell is fixedly connected with a cleaning box, and the side surface of the protective shell is provided with a filter plate; and a crushing device is arranged on the side face of the protective shell and comprises a supporting plate, the supporting plate is fixedly connected to the side face of the cleaning box, a motor is fixedly connected to the bottom of the supporting plate, and an output shaft of the motor is fixedly connected with a rotating rod. According to the technical scheme, the problems that in the prior art, the effects of vibrating the filter plate and reducing the filtering speed are difficult to realize while pollutants are crushed, blockage of a water inlet caused by large-particle substances or impurities is difficult to avoid, accumulation of the pollutants is not reduced, the service life of the filter is shortened, blockage of the water inlet due to accumulation of the pollutants is difficult to avoid, and the service life of the filter is prolonged are solved. And the smoothness of water flow is difficult to ensure.

Description

Technical Field

[0001] The invention relates to the technical field of water inlets of regulating reservoirs, and in particular to a pollutant intercepting device for the water inlets of regulating reservoirs. Background Art

[0002] The sewage treatment process is often accompanied by solid pollutants that are insoluble in water, such as solid plastic products and sawdust. Such pollutants can be found everywhere and can float on or in the water with the flow of water. They are difficult to clean and can easily clog the pipelines used for sewage treatment, and even cause the blades in the pump to get stuck, and the working pump to burn out after the power continues to increase.

[0003] According to a publicly disclosed solid pollutant crushing device for sewage inlet (publication number: CN208542314U), The utility model comprises a sewage inlet, an upper blade ring, a crushing knife, a lower blade ring, a connecting shaft and a motor; the upper blade ring, the crushing knife and the lower blade ring are arranged in the sewage inlet, and the crushing knife is arranged between the upper blade ring and the lower blade ring; the upper blade ring, the crushing knife and the lower blade ring are mounted on the connecting shaft; the motor is mounted on the outside of the sewage inlet; the crushing knife comprises a crushing blade and a crushing knife ring; the crushing knife ring is mounted on the connecting shaft; the crushing blade is welded and mounted on the crushing knife ring; the motor comprises a motor shaft and motor shaft teeth; the motor shaft teeth are mounted on the top of the motor shaft 7, and the motor shaft teeth are mounted between the first gear ring and the second gear ring. However, in the above-mentioned device, it is difficult to achieve the effect of crushing the pollutants while vibrating the filter plate and reducing the filtering speed through the mutual cooperation of the components such as the lower blade ring, the connecting shaft and the motor, and it is difficult to avoid the blockage of the water inlet caused by large particles or debris, which is not conducive to reducing the accumulation of dirt and reducing its service life. It is difficult to avoid the accumulation of pollutants and blocking the water inlet, and it is difficult to ensure the smooth flow of water, which needs to be improved. Summary of the invention

[0004] The present invention proposes a pollutant interception device for the water inlet of a regulating reservoir, which solves the problems raised in the above documents.

[0005] The technical solution of the present invention is as follows: A pollutant interception device for a water inlet of a regulating reservoir comprises a protective shell, a cleaning box is fixedly connected to the side of the protective shell, and a filter plate is arranged on the side of the protective shell; A crushing device is provided on the side of the protective shell, and the crushing device includes a support plate, and the support plate is fixedly connected to the side of the cleaning box, and the bottom of the support plate is fixedly connected to a motor, and the output shaft of the motor is fixedly connected to a rotating rod, and the circumferential surface of the rotating rod is fixedly connected to a gear, and the circumferential surface of the rotating rod is fixedly connected to a crushing roller, and the circumferential surface of the rotating rod is fixedly connected to a support rod, and the end of the support rod away from the rotating rod is rotatably connected to a roller, and the crushing device includes a vibration structure, and the force of the rotating rod driven by the motor to rotate is combined with the crushing roller, the support rod and the telescopic rod in the crushing device The components cooperate with each other so that when the roller rotates to the side of the filter plate, the filter plate is squeezed and displaced, and the telescopic rod and spring on the side of the protective shell are stretched. When the roller moves away from the filter plate, the filter plate is reset by the elastic force of the spring, thereby crushing the pollutants and vibrating the filter plate, thereby accelerating the filtration speed. It can effectively avoid blockage of the water inlet caused by large particles or debris, help reduce the accumulation of dirt, keep the filter medium clean, and extend its service life. It can avoid the accumulation of pollutants to block the water inlet, thereby ensuring smooth water flow and reducing the maintenance cost and risk of the system.

[0006] The vibration structure includes a telescopic rod, one end of which is fixedly connected to the side of the protective shell, and the other end of the telescopic rod is fixedly connected to the side of the filter plate. A spring is fixedly connected to the side of the protective shell, and one end of the spring away from the protective shell is fixedly connected to the side of the filter plate. The device drives the support rod to rotate the roller through the rotating rod, thereby causing the filter plate to vibrate, which helps to reduce the accumulation of dirt, keep the filter medium clean, and extend its service life.

[0007] The filter plate is located on the movement track of the roller, the initial state of the spring is a relaxed state, the number of the gears is set to be several, and they are arranged along a linear array on the top of the protective shell. When the roller is away from the filter plate, the elastic force of the spring resets the filter plate, thus avoiding the need for manual cleaning and reducing manual intervention.

[0008] A stirring device is arranged on the side of the protective shell, and the stirring device includes a rotating rod, the rotating rod is fixedly connected to the bottom of the rotating rod, the circumferential surface of the rotating rod is fixedly connected to a gear plate, the inner wall of the cleaning box is rotatably connected to a rotating shaft, the circumferential surface of the rotating shaft is fixedly connected to a rotating gear, the circumferential surface of the rotating shaft is fixedly connected to a spiral blade, and the stirring device includes an oil removal structure.

[0009] The oil removal structure includes a fixed plate, which is fixedly connected to the side of the protective shell, a rotating rod A passes through the top of the fixed plate, a gear A is fixedly connected to the circumferential surface of the rotating rod A, a helical gear is fixedly connected to the circumferential surface of the rotating rod A, a rotating shaft passes through the side of the protective shell, a bevel gear is fixedly connected to the circumferential surface of the rotating shaft, a sprocket is fixedly connected to the circumferential surface of the rotating shaft, a chain passes through the side of the cleaning box, and filter paper is provided on the side of the chain. The filter paper is driven to rotate by the chain and can continuously contact with the sewage and absorb floating oil on the water surface.

[0010] The side surface of the sprocket meshes with the inner wall of the chain, the side surface of the helical gear meshes with the side surface of the bevel gear, the side surface of the protective shell is fixedly connected with a positioning plate, and the top of the positioning plate is fixedly connected with a scraper. The device scrapes off the floating oil adsorbed on the surface of the filter paper through the scraper. This design ensures that the adsorption efficiency of the filter paper surface will not be reduced due to the accumulation of oil stains.

[0011] The side surface of the gear A meshes with the side surface of the gear, and the number of the telescopic rods is set to be a plurality, two by two in a group, and symmetrical with each other along the vertical center axis of the protective shell.

[0012] A cleaning device is provided on the side of the protective shell, and the cleaning device includes a gear plate A, which is fixedly connected to the circumferential surface of the rotating rod A. A round rod passes through the top of the fixed plate, and a half gear is fixedly connected to the circumferential surface of the round rod, and a knocking rod is fixedly connected to the circumferential surface of the round rod.

[0013] A torsion spring is fixedly connected to the top of the fixed plate, and one end of the torsion spring away from the fixed plate is fixedly connected to the circumferential surface of the round rod. The design of the torsion spring can make the knocking rod automatically reset. By knocking the filter plate, the pollutants can quickly fall off the filter plate, avoiding the accumulation of pollutants.

[0014] The initial state of the torsion spring is a relaxed state, and the side of the gear plate A meshes with the side of the half gear with the tooth block. The use of the torsion spring enables the device to be reset when necessary, thereby increasing the stability and reliability of the entire system.

[0015] The working principle and beneficial effects of the present invention are: 1. In the present invention, the force of the rotating rod driven by the motor cooperates with the components such as the crushing roller, the support rod and the telescopic rod in the crushing device, so that when the roller rotates to the side of the filter plate, the filter plate is squeezed and displaced, and the telescopic rod and the spring on the side of the protective shell are stretched. When the roller is away from the filter plate, the filter plate is reset by the elastic force of the spring, so that the pollutants are crushed and the filter plate is vibrated at the same time, thereby accelerating the filtration speed, effectively avoiding the blockage of the water inlet caused by large particles or debris, helping to reduce the accumulation of dirt, keeping the filter medium clean, and extending its service life. It can avoid the accumulation of pollutants and blocking the water inlet, thereby ensuring smooth water flow and reducing the maintenance cost and risk of the system.

[0016] 2. In the present invention, the force of the rotating rod driving the rotating rod to rotate cooperates with the components such as the rotating shaft, the rotating gear and the fixed plate in the stirring device, so that the rotating rod drives the gear plate to rotate, the gear plate drives the rotating gear to rotate, and the rotating shaft drives the spiral blade to rotate through the rotating gear. The effect of absorbing the floating oil on the top of the sewage through the filter paper is achieved, which can speed up the separation of the floating oil, avoid the floating oil staying on the water surface for a long time, reduce its impact on the water quality, and provide better conditions for subsequent treatment and cleaning work, greatly reduce the frequency and cost of manual cleaning, and improve the economy and long-term sustainability of the system.

[0017] 3. In the present invention, the force of the gear plate A driven by the rotating rod A cooperates with the components such as the half gear, the knocking rod and the torsion spring in the cleaning device, so that the knocking rod is driven to rotate by the rotation of the round rod, and then the knocking rod rotates to knock the filter plate. When the side with the tooth block of the half gear is separated from the side of the gear plate A, the round rod is reset by the elastic force of the torsion spring, so as to achieve the effect of knocking the filter plate to make the pollutants on the side of the filter plate fall off. The automatic cleaning process reduces the need for manual cleaning, ensures the effectiveness of the filter device after long-term use, and reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 It is a schematic diagram of the three-dimensional appearance structure of the present invention; Figure 2 It is a three-dimensional side view structural schematic diagram of the support plate of the present invention; Figure 3 It is a schematic diagram of the three-dimensional half-section structure of the crushing roller of the present invention; Figure 4 It is a schematic diagram of the three-dimensional half-section structure of the chain of the present invention; Figure 5It is a schematic diagram of the three-dimensional enlarged structure of the spiral blade of the present invention; Figure 6 It is a three-dimensional side view structural schematic diagram of the sprocket of the present invention; Figure 7 It is a three-dimensional enlarged structural schematic diagram of the torsion spring of the present invention; Figure 8 For the present invention Figure 3 Schematic diagram of the three-dimensional enlarged structure of A in the middle.

[0020] In the figure: 101, protective shell; 102, cleaning box; 103, filter plate; 2, crushing device; 201, support plate; 202, motor; 203, rotating rod; 204, gear; 205, crushing roller; 206, support rod; 207, roller; 208, telescopic rod; 209, spring; 3, stirring device; 301, rotating rod; 302, gear plate; 303, rotating shaft; 304, rotating gear Wheel; 305, spiral blade; 306, fixed plate; 307, rotating rod A; 308, gear A; 309, bevel gear; 310, bevel gear; 311, rotating shaft; 312, positioning plate; 313, scraper; 314, sprocket; 315, chain; 316, filter paper; 4, cleaning device; 401, gear plate A; 402, half gear; 403, round rod; 404, torsion spring; 405, knocking rod. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0022] Example 1 like Figures 1 to 8 As shown, this embodiment proposes a pollutant interception device for the water inlet of a regulating reservoir, comprising a protective shell 101, a cleaning box 102 is fixedly connected to the side of the protective shell 101, and a filter plate 103 is arranged on the side of the protective shell 101; A crushing device 2 is arranged on the side of the protective shell 101, and the crushing device 2 includes a support plate 201, and the support plate 201 is fixedly connected to the side of the cleaning box 102, and the bottom of the support plate 201 is fixedly connected to a motor 202, and the output shaft of the motor 202 is fixedly connected to a rotating rod 203, and the circumferential surface of the rotating rod 203 is fixedly connected to a gear 204, and the circumferential surface of the rotating rod 203 is fixedly connected to a crushing roller 205, and the circumferential surface of the rotating rod 203 is fixedly connected to a support rod 206, and the end of the support rod 206 away from the rotating rod 203 is rotatably connected to a roller 207, and the crushing device 2 includes a vibration structure.

[0023] The vibration structure includes a telescopic rod 208, one end of which is fixedly connected to the side of the protective shell 101, and the other end of the telescopic rod 208 is fixedly connected to the side of the filter plate 103. The side of the protective shell 101 is fixedly connected with a spring 209, and the end of the spring 209 away from the protective shell 101 is fixedly connected to the side of the filter plate 103. The device drives the support rod 206 to rotate the roller 207 through the rotating rod 203, thereby causing the filter plate 103 to vibrate, which helps to reduce the accumulation of dirt, keep the filter medium clean, and extend its service life.

[0024] The filter plate 103 is located on the movement track of the roller 207, the initial state of the spring 209 is a relaxed state, the number of gears 204 is set to be a plurality, and they are arranged along a linear array at the top of the protective shell 101. When the roller 207 is away from the filter plate 103, the elastic force of the spring 209 resets the filter plate 103, thus avoiding the need for manual cleaning and reducing manual intervention.

[0025] A stirring device 3 is arranged on the side of the protective shell 101, and the stirring device 3 includes a rotating rod 301, and the rotating rod 301 is fixedly connected to the bottom of the rotating rod 203, and the circumferential surface of the rotating rod 301 is fixedly connected to the gear plate 302, and the inner wall of the cleaning box 102 is rotatably connected to the rotating shaft 303, and the circumferential surface of the rotating shaft 303 is fixedly connected to the rotating gear 304, and the circumferential surface of the rotating shaft 303 is fixedly connected to the spiral blade 305, and the stirring device 3 includes an oil removal structure.

[0026] The oil removal structure includes a fixed plate 306, which is fixedly connected to the side of the protective shell 101. A rotating rod A307 is passed through the top of the fixed plate 306. The circumferential surface of the rotating rod A307 is fixedly connected to a gear A308. The circumferential surface of the rotating rod A307 is fixedly connected to a bevel gear 309. A rotating shaft 311 is passed through the side of the protective shell 101. The circumferential surface of the rotating shaft 311 is fixedly connected to a bevel gear 310. The circumferential surface of the rotating shaft 311 is fixedly connected to a sprocket 314. A chain 315 is passed through the side of the cleaning box 102. A filter paper 316 is arranged on the side of the chain 315. The filter paper 316 is driven to rotate by the chain 315, and can continuously contact with the sewage and absorb floating oil on the water surface.

[0027] The side of the sprocket 314 meshes with the inner wall of the chain 315, the side of the bevel gear 309 meshes with the side of the bevel gear 310, the side of the protective shell 101 is fixedly connected with a positioning plate 312, and the top of the positioning plate 312 is fixedly connected with a scraper 313. The device scrapes off the floating oil adsorbed on the surface of the filter paper 316 through the scraper 313. This design ensures that the adsorption efficiency of the surface of the filter paper 316 will not be reduced due to the accumulation of oil stains.

[0028] The side surface of the gear A308 meshes with the side surface of the gear 204 . The number of the telescopic rods 208 is set to be plural, in groups of two, and symmetrical along the vertical center axis of the protective shell 101 .

[0029] In this embodiment, the present application drives the rotating rod 203 to rotate through the motor 202, and then drives the crushing roller 205 to rotate through the rotation of the rotating rod 203, and drives the gear 204 to rotate through the rotation of the rotating rod 203, thereby driving the four crushing rollers 205 to rotate, thereby achieving the effect of crushing pollutants, and driving the support rod 206 to rotate through the rotation of the rotating rod 203, and then driving the roller 207 to rotate through the rotation of the support rod 206. When the roller 207 moves to the side of the filter plate 103, the filter plate 103 is squeezed and displaced, and the telescopic rod 208 and the spring 209 on the side of the protective shell 101 are stretched. When the roller 207 is away from the filter plate 103, the filter plate 103 is reset by the elastic force of the spring 209, thereby achieving the effect of vibrating the filter plate 103 and accelerating the filtration speed.

[0030] The rotating rod 203 rotates to drive the rotating rod 301 to rotate, and the rotating rod 301 rotates to drive the gear plate 302 to rotate, and the gear plate 302 rotates to drive the rotating gear 304 to rotate, and the rotating shaft 303 rotates through the rotating gear 304, and the spiral blade 305 rotates through the rotating shaft 303, so as to achieve the effect of stirring the sewage in the cleaning box 102, so that the floating oil in the sewage quickly reaches the top of the sewage, and the gear 204 rotates to drive the gear A308 to rotate, and the gear A308 rotates to drive the rotating shaft 303 to rotate. The movable rod A307 rotates, and the rotating rod A307 rotates to drive the bevel gear 309 to rotate, and the bevel gear 309 rotates to drive the bevel gear 310 to rotate, and the bevel gear 310 rotates to drive the rotating shaft 311 to rotate, and the rotating shaft 311 rotates to drive the sprocket 314 to rotate, and the sprocket 314 rotates to drive the chain 315 to rotate, and the chain 315 rotates to drive the filter paper 316 to rotate, so that the filter paper 316 absorbs the floating oil on the top of the sewage, and then the scraper 313 scrapes off the floating oil on the surface of the filter paper 316.

[0031] Example 2 like Figures 1 to 8 As shown, based on the same concept as the above-mentioned embodiment 1, a second embodiment is also proposed, a cleaning device 4 is arranged on the side of the protective shell 101, and the cleaning device 4 includes a gear plate A401, and the gear plate A401 is fixedly connected to the circumferential surface of the rotating rod A307, and a round rod 403 passes through the top of the fixed plate 306, and a half gear 402 is fixedly connected to the circumferential surface of the round rod 403, and a knocking rod 405 is fixedly connected to the circumferential surface of the round rod 403.

[0032] A torsion spring 404 is fixedly connected to the top of the fixed plate 306, and one end of the torsion spring 404 away from the fixed plate 306 is fixedly connected to the circumferential surface of the round rod 403. The design of the torsion spring 404 can make the knocking rod 405 automatically reset. By knocking the filter plate 103, the pollutants can quickly fall off the filter plate 103, avoiding the accumulation of pollutants.

[0033] The initial state of the torsion spring 404 is a relaxed state, and the side of the gear plate A401 is meshed with the side of the half gear 402 with the tooth block. The use of the torsion spring 404 enables the device to be reset when necessary, increasing the stability and reliability of the entire system.

[0034] In this embodiment, the gear plate A401 is driven to rotate by rotating the rotating rod A307, and the gear plate A401 drives the half gear 402 to rotate. When the side of the half gear 402 with the tooth block is engaged with the gear plate A401, the gear plate A401 drives the half gear 402 to rotate, and the round rod 403 is driven to rotate by the rotation of the half gear 402. The knocking rod 405 is driven to rotate by the rotation of the round rod 403, and the knocking rod 405 is rotated to knock the filter plate 103. When the side of the half gear 402 with the tooth block is separated from the side of the gear plate A401, the round rod 403 is reset by the elastic force of the torsion spring 404, thereby achieving the effect of knocking the filter plate 103 to make the pollutants on the side of the filter plate 103 fall off.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pollutant interception device for a water inlet of a regulating reservoir, characterized in that: It comprises a protective shell (101), a cleaning box (102) is fixedly connected to the side of the protective shell (101), and a filter plate (103) is arranged on the side of the protective shell (101); A crushing device (2) is arranged on the side of the protective shell (101), and the crushing device (2) comprises a support plate (201), the support plate (201) is fixedly connected to the side of the cleaning box (102), the bottom of the support plate (201) is fixedly connected to a motor (202), the output shaft of the motor (202) is fixedly connected to a rotating rod (203), the circumferential surface of the rotating rod (203) is fixedly connected to a gear (204), the circumferential surface of the rotating rod (203) is fixedly connected to a crushing roller (205), the circumferential surface of the rotating rod (203) is fixedly connected to a support rod (206), and one end of the support rod (206) away from the rotating rod (203) is rotatably connected to a roller (207), and the crushing device (2) comprises a vibration structure.

2. A pollutant interception device for a water inlet of a regulating reservoir according to claim 1, characterized in that: The vibration structure comprises a telescopic rod (208), one end of the telescopic rod (208) being fixedly connected to a side surface of the protective shell (101), the other end of the telescopic rod (208) being fixedly connected to a side surface of the filter plate (103), a spring (209) being fixedly connected to the side surface of the protective shell (101), and one end of the spring (209) away from the protective shell (101) being fixedly connected to the side surface of the filter plate (103).

3. A pollutant interception device for a water inlet of a regulating reservoir according to claim 2, characterized in that: The filter plate (103) is located on the motion track of the roller (207), the initial state of the spring (209) is a relaxed state, and the number of the gears (204) is set to be a plurality and arranged along a linear array on the top of the protective shell (101).

4. A pollutant interception device for a water inlet of a regulating reservoir according to claim 3, characterized in that: A stirring device (3) is arranged on the side of the protective shell (101), the stirring device (3) comprising a rotating rod (301), the rotating rod (301) being fixedly connected to the bottom of the rotating rod (203), the circumferential surface of the rotating rod (301) being fixedly connected to a gear plate (302), the inner wall of the cleaning box (102) being rotatably connected to a rotating shaft (303), the circumferential surface of the rotating shaft (303) being fixedly connected to a rotating gear (304), the circumferential surface of the rotating shaft (303) being fixedly connected to a spiral blade (305), and the stirring device (3) comprising an oil removal structure.

5. A pollutant interception device for a water inlet of a regulating reservoir according to claim 4, characterized in that: The oil removal structure comprises a fixed plate (306), wherein the fixed plate (306) is fixedly connected to the side of the protective shell (101), a rotating rod A (307) is passed through the top of the fixed plate (306), a gear A (308) is fixedly connected to the circumferential surface of the rotating rod A (307), a bevel gear (309) is fixedly connected to the circumferential surface of the rotating rod A (307), a rotating shaft (311) is passed through the side of the protective shell (101), a bevel gear (310) is fixedly connected to the circumferential surface of the rotating shaft (311), a sprocket (314) is fixedly connected to the circumferential surface of the rotating shaft (311), and a chain (315) is passed through the side of the cleaning box (102), and a filter paper (316) is arranged on the side of the chain (315).

6. A pollutant interception device for a water inlet of a regulating reservoir according to claim 5, characterized in that: The side surface of the sprocket (314) meshes with the inner wall of the chain (315), the side surface of the helical gear (309) meshes with the side surface of the bevel gear (310), the side surface of the protective shell (101) is fixedly connected to a positioning plate (312), and the top of the positioning plate (312) is fixedly connected to a scraper plate (313).

7. A pollutant interception device for a water inlet of a regulating reservoir according to claim 6, characterized in that: The side surface of the gear A (308) meshes with the side surface of the gear (204), and the number of the telescopic rods (208) is set to be a plurality, in groups of two, and symmetrical along the vertical center axis of the protective shell (101).

8. A pollutant interception device for a water inlet of a regulating reservoir according to claim 7, characterized in that: A cleaning device (4) is provided on the side of the protective shell (101), and the cleaning device (4) comprises a gear plate A (401), the gear plate A (401) is fixedly connected to the circumferential surface of the rotating rod A (307), a round rod (403) passes through the top of the fixed plate (306), a half gear (402) is fixedly connected to the circumferential surface of the round rod (403), and a knocking rod (405) is fixedly connected to the circumferential surface of the round rod (403).

9. A pollutant interception device for a water inlet of a regulating reservoir according to claim 8, characterized in that: A torsion spring (404) is fixedly connected to the top of the fixing plate (306), and one end of the torsion spring (404) away from the fixing plate (306) is fixedly connected to the circumferential surface of the round rod (403).

10. A pollutant interception device for a water inlet of a regulating reservoir according to claim 9, characterized in that: The initial state of the torsion spring (404) is a relaxed state, and the side surface of the gear plate A (401) and the side of the half gear (402) having the tooth block are meshed with each other.

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