Oncomelania screening equipment

Abstract

The utility model discloses oncomelania screening equipment which comprises a rack and a screening assembly, the screening assembly comprises a support rotationally connected to the rack, the support is connected with an inclination angle adjusting mechanism, an annular screening hopper is arranged in the support, the screening hopper is in a horizontal state at the beginning, the rear end of the screening hopper is provided with a bottom, and a power motor for driving the screening hopper to rotate is arranged on the support. The front end of the screen hopper is open and provided with a screen cover capable of being opened and closed, a vibrating screen assembly connected with the rack is arranged below the support, and a collecting box is arranged below a screw outlet of the vibrating screen assembly. According to the oncomelania screening equipment, centrifugal force generated when the transverse cylindrical screening hopper rotates is adopted for conducting primary screening on oncomelania mud mixtures, secondary screening is further conducted through the vibrating screen assembly, and oncomelania large in size is screened out. The inclination of the screening hopper can be adjusted, feeding and foreign matter discharging are facilitated, the oncomelania can be cleaned in cooperation with high-pressure spraying in the screening process, and it is guaranteed that the surfaces of the screened oncomelania are cleaner.

Description

Technical Field

[0001] This utility model relates to the field of Oncomelania snail separation technology, specifically to an Oncomelania snail screening device. Background Technology

[0002] Schistosomiasis japonicus is a serious zoonotic infectious disease that poses a significant threat to human health. It is prevalent in 12 provinces (municipalities and autonomous regions) south of the Yangtze River in my country and is a major public health issue. Although years of prevention and control efforts have significantly reduced the national schistosomiasis epidemic, the distribution area of ​​Oncomelania hupensis snails in endemic areas remains large, with severe snail spread in some localized regions, posing a continued risk of schistosomiasis transmission. Currently, the total area inhabited by Oncomelania hupensis snails in China reaches 3.5 billion m². 2 The above-mentioned snails are widely distributed in the riverbanks and lake beaches along the middle and lower reaches of the Yangtze River. Due to the impact of floods, the area affected by the snails is showing a trend of expansion.

[0003] As the only intermediate host of Schistosoma japonicum, Oncomelania snails play a crucial role in the transmission of schistosomiasis. Oncomelania snail surveys are an important measure and fundamental work for schistosomiasis control. Determining the distribution, density, and viability of snails, as well as their infection status, is essential for understanding the extent of the epidemic area, monitoring the schistosomiasis epidemic, developing snail eradication plans, evaluating the effectiveness of snail eradication efforts, and assessing the risk of transmission.

[0004] In practice, the most common method is direct manual observation. However, due to the small size of Oncomelania snails, the complexity of their breeding environment, and the susceptibility to external factors such as weather and water levels during capture, manual snail capture is time-consuming, labor-intensive, and has a high rate of missed detection, making it impossible to accurately obtain the distribution of Oncomelania snails on site. To address these issues, some professionals have researched and designed related Oncomelania snail survey devices. Wu Feng et al. developed a snail sieve for on-site snail sieving. By pouring a mixture of snail-containing mud and other materials from riverbanks onto the sieve, and then washing away the mud and sand with water, only the snails remain on the sieve. However, this manual snail sieving method is time-consuming, labor-intensive, and inefficient, failing to meet the needs of on-site work and making it difficult to use on a large scale. In some areas, people use vacuum cleaner-like snail suction devices to collect Oncomelania snails. For example, Hu Fei et al. developed an easy-to-operate snail collection device. This device uses baffles to prevent the suction of larger objects, and the holes on the baffle surface only allow snails to pass through, reducing internal blockage and increasing the device's lifespan. However, this method of simply relying on suction to absorb snails is insufficient to solve the blockage problem, and it can only effectively collect snails on the soil surface, failing to effectively collect snails deep within the soil, resulting in a high rate of missed detection. Li Xun et al. developed an automated snail-finding device that uses surface images to check for snails, but this device is not very useful and is bulky, making it difficult to deploy in fieldwork now and in the future. Although the above-mentioned improvements to snail-finding devices have some innovative aspects, their practicality is poor, and they have not been used in actual fieldwork.

[0005] With economic and social development and the advancement of science and technology, my country has accelerated the process of eliminating schistosomiasis. At present, there are higher requirements for the quality of snail inspection work. Related electromechanical technologies are already available. In order to adapt to the new work needs, improve the quality and efficiency of snail inspection work, identify risk areas and achieve precise snail eradication, and help the city's work to eliminate schistosomiasis, it is urgent to develop a mechanical, automated, and practical snail inspection device. Utility Model Content

[0006] 1. Technical problem to be solved: Existing snail screening equipment is not practical and has poor separation effect.

[0007] To address the aforementioned technical problems, this utility model provides a snail screening device.

[0008] 2. Technical Solution:

[0009] A snail screening device includes a frame and a screening assembly. The screening assembly includes a bracket rotatably connected to the frame, and the bracket is connected to an angle adjustment mechanism. An annular sieve bucket is provided inside the bracket. Initially, the sieve bucket is in a horizontal state. The rear end of the sieve bucket has a bottom. A power motor for driving the sieve bucket to rotate is provided on the bracket. The front end of the sieve bucket is open and has an openable and closable sieve cover. A vibrating screen assembly connected to the frame is provided below the bracket. A collection box is provided below the snail outlet of the vibrating screen assembly.

[0010] Furthermore, the bracket includes two symmetrically arranged fixing rings at the front and rear. The two fixing rings are fixedly connected by three crossbeams on the left, right and top sides. Rotating shafts are provided on the two symmetrical crossbeams on the left and right sides, and the rotating shafts are rotatably connected to the spherical bearings of the frame.

[0011] Furthermore, a mounting plate is provided inside the fixing ring at the rear end, and the power motor is fixed on the mounting plate. Two fixing plates are symmetrically provided on the left and right sides of the screen bucket at an angle below. The two ends of the fixing plates are fixedly connected to the two fixing rings respectively. At least two support wheels are provided on the side of the fixing plate near the screen bucket.

[0012] Furthermore, one end of the screen cover is hinged to the screen hopper by a hinge, and the other end is fixed by a tension clamp.

[0013] Furthermore, a foreign object discharge plate is provided on the front fixing ring, and the foreign object discharge plate is located below the opening of the screen hopper.

[0014] Furthermore, an angle sensor is installed on one of the crossbeams to detect the rotation angle of the screen bucket.

[0015] Furthermore, multiple protruding pointed pillars are evenly distributed on the inner surface of the sieve hopper.

[0016] Furthermore, the tilt adjustment mechanism includes an electric actuator, the fixed end of which is hinged to the frame, and the movable end of which is hinged to the left or right crossbeam.

[0017] Furthermore, the frame is equipped with a protective cover that shields the sides and top of the sieve bucket, and the protective cover has a transparent viewing window.

[0018] Furthermore, the vibrating screen assembly includes a screen and a vibrating motor. The vibrating motor is fixed at the bottom of the screen, the bottom of the screen is inclined downwards towards the front end, the screw outlet is located at the bottom of the screen, and a screw outlet cover plate is provided on the screw outlet.

[0019] Furthermore, the crossbeams are hollow inside, and each of the three crossbeams is equipped with multiple spray heads on the side near the screen bucket. The top crossbeam is connected to a water inlet pipe, and the two fixing rings have a guide cavity that connects the internal space of the three crossbeams.

[0020] Furthermore, the frame is also equipped with an electrical control box, which has operation buttons.

[0021] Furthermore, the frame has two locking casters at the bottom front end, two directional casters at the bottom rear end, and a handle at the top rear end.

[0022] 3. Beneficial effects:

[0023] This invention provides a snail screening device. It utilizes the centrifugal force of a horizontally rotating cylindrical screen bucket to perform a primary screening of the snail-mud mixture, removing excessively large foreign objects. The snails and fine sand then enter a vibrating screen assembly for secondary screening, removing the larger snails. The screen bucket's inclination is adjustable for easy feeding and removal of foreign objects. High-pressure spraying can also be used during the screening process to clean the snails, ensuring a cleaner surface after screening. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the snail screening device of this utility model;

[0025] Figure 2 This is a perspective view of the snail screening device without a protective outer cover according to this utility model.

[0026] Figure 3 This is a structural schematic diagram of the bracket and its upper components of this utility model;

[0027] Figure 4 This is a first-view structural schematic diagram of the vibrating screen of this utility model;

[0028] Figure 5 This is a schematic diagram of the second-view structure of the vibrating screen of this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the sieve bucket of this utility model. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings.

[0031] As attached Figure 1 To be continued Figure 6 , Specific implementation examples:

[0033] A snail screening device includes a frame 1 and a screening assembly. The screening assembly includes a support 2 rotatably connected to the frame 1. The support 2 is connected to an angle adjustment mechanism. An annular sieve 3 is provided inside the support 2. Initially, the sieve 3 is in a horizontal state. The rear end of the sieve 3 has a bottom. A power motor 4 for driving the sieve 3 to rotate is provided on the support 2. The front end of the sieve 3 is open and has an openable and closable sieve cover 5. A vibrating screen assembly 6 connected to the frame 2 is provided below the support 2. A collection box 7 is provided below the snail outlet of the vibrating screen assembly 6. In use, first adjust the state of the sieve hopper 3 using the tilt adjustment mechanism so that the opening side is tilted upwards at about 20°. Open the sieve cover 5 and add the snail-mud mixture obtained from the target sampling point into the sieve hopper 3. Because the opening side is slightly higher, the added snail-mud mixture will slide backwards, ensuring convenient feeding. After feeding, adjust the sieve hopper 3 to its initial horizontal state and start the power motor 4 to drive the sieve hopper 3 to rotate. Due to centrifugal force, the small snails and mud in the sieve hopper 3 are screened out and enter the vibrating screen assembly 6, while some larger foreign objects such as branches are retained in the sieve hopper 3. The vibrating screen assembly 6 continues to work to separate out the finer mud and sand, leaving only the snails. The snails enter the collection box 7 through the snail outlet for collection. It should be noted that the sieve holes of the sieve hopper 3 are 5*15mm waist-shaped holes, which can remove foreign objects larger than φ5mm. The shape fits the slender structure of the snail, facilitating the snail's passage and preventing foreign objects from leaking out.

[0034] Specifically, the support 2 includes two symmetrically arranged fixing rings 201 at the front and rear. The fixing rings 201 are concentric with the screen bucket 3 and are larger in size than the screen bucket 3. The two fixing rings 201 are fixedly connected by three crossbeams 202 on the left, right and top sides. The two symmetrical crossbeams 202 on the left and right sides are provided with rotating shafts 203, which are rotatably connected to the spherical bearing 8 of the frame 1.

[0035] A mounting plate 204 is also provided inside the rear retaining ring 201. The power motor 4 is fixed on the mounting plate 204. Two fixing plates 9 are symmetrically provided on the lower left and right sides of the screen bucket 3. The two ends of the fixing plates 9 are fixedly connected to the two retaining rings 201 respectively. At least two support wheels 10 are provided on the side of the fixing plate 9 near the screen bucket 3. The support wheels 10 serve to support the screen bucket 3 and ensure that the screen bucket 3 can rotate normally.

[0036] Preferably, one end of the screen cover 5 is hinged to the screen hopper 3 via a hinge 11, and the other end is fixed by a tension clamp 12. The tension clamp 12 can be used to open and close the screen cover 5.

[0037] Preferably, a foreign object discharge plate 13 is provided on the front fixing ring 201, and the foreign object discharge plate 13 is located below the opening of the sieve hopper 3. When the sieve cover 5 is opened and the sieve hopper 3 is tilted so that the opening side faces downward, the excessively large foreign objects retained in the sieve hopper 3 are poured out and collected through the foreign object discharge plate 13.

[0038] Preferably, an inclination sensor 14 is installed on one of the crossbeams 202 to detect the rotation angle of the screen bucket 3. The automatic start and stop of the screen bucket when tilted can be set according to the feedback information of the inclination sensor 14.

[0039] Preferably, a plurality of protruding pointed pillars 301 are evenly distributed on the inner surface of the sieve hopper 3. The pointed pillars 301 are 4×20mm in size. The protruding pointed pillars 301 can break up the mud clumps or other foreign objects that wrap around the snails when the sieve hopper 3 rotates, ensuring more thorough screening.

[0040] Specifically, the tilt adjustment mechanism includes an electric actuator 15, the fixed end of which is hinged to the frame 1, and the movable end of which is hinged to the left or right crossbeam 202.

[0041] The frame 1 is equipped with a protective cover 16, which shields the sides and top of the screen bucket 3. The protective cover 16 has a transparent viewing window. The protective cover 16 can prevent the mud and water thrown out by the centrifuge from polluting the surrounding environment, and can make the screened snails and mud and sand accurately enter the vibrating screen assembly for secondary screening. The transparent viewing window can be used to observe the screening process.

[0042] The vibrating screen assembly 6 includes a screen 601 and a vibrating motor 602. The vibrating motor 602 is fixed to the bottom of the screen 601, and the bottom of the screen 601 slopes downwards towards the front end. The screw outlet is located at the lower part of the bottom of the screen 601, and a screw outlet cover plate 603 is provided on the screw outlet. The vibrating motor 602 acts on the screen 601, separating the snails from finer mud and sand through vibration. The separated snails are poured out through the screw outlet, and the sloping bottom ensures that the screened snails converge towards the screw outlet.

[0043] The interior of the crossbeam 202 is hollow. Multiple spray heads 17 are installed on the side of each of the three crossbeams 202 closest to the screen hopper 3. A water inlet pipe 18 is connected to the top crossbeam 202. The two fixing rings 201 have flow guide chambers that connect the interior spaces of the three crossbeams 202. The snails are rinsed by the high-pressure spray heads 17, resulting in a cleaner surface for the screened snails.

[0044] The frame 1 is also equipped with an electrical control box 19, and the electrical control box 19 is equipped with operation buttons 20.

[0045] The bottom front end of the frame 1 is provided with two locking casters 21, the bottom rear end of the frame 1 is provided with two directional casters 22, and the top rear end of the frame 1 is provided with a handle 23.

[0046] Although the present invention has been disclosed above with reference to preferred embodiments, these are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope of protection of the claims of this application.

Claims

1. A snail screening device, characterized in that, The device includes a frame and a screening assembly. The screening assembly includes a bracket rotatably connected to the frame, and the bracket is connected to an angle adjustment mechanism. The bracket contains an annular screen bucket, which is initially horizontal. The rear end of the screen bucket has a bottom. The bracket is equipped with a power motor that drives the screen bucket to rotate. The front end of the screen bucket is open and has an openable and closable screen cover. Below the bracket is a vibrating screen assembly connected to the frame. Below the outlet of the vibrating screen assembly is a collection box.

2. The snail screening device according to claim 1, characterized in that, The support includes two symmetrically arranged fixing rings at the front and rear. The two fixing rings are fixedly connected by three crossbeams on the left, right and top sides. The two symmetrical crossbeams on the left and right sides are equipped with rotating shafts, which are rotatably connected to the spherical bearings of the frame. The fixing ring at the rear end is equipped with a mounting plate, and the power motor is fixed on the mounting plate. Two fixing plates are symmetrically arranged diagonally below the left and right sides of the screen bucket. The two ends of the fixing plates are fixedly connected to the two fixing rings respectively. At least two support wheels are provided on the side of the fixing plate near the screen bucket.

3. The snail screening device according to claim 1, characterized in that, One end of the screen cover is hinged to the screen hopper by a hinge, and the other end is fixed by a tension clamp.

4. The snail screening device according to claim 2, characterized in that, The front retaining ring is equipped with a foreign object discharge plate, which is located below the opening of the sieve hopper.

5. The snail screening device according to claim 2, characterized in that, One of the crossbeams is equipped with an tilt sensor to detect the rotation angle of the screen bucket.

6. The snail screening device according to claim 1, characterized in that, The inner surface of the sieve bucket has a number of protruding pointed pillars evenly distributed.

7. The snail screening device according to claim 2, characterized in that, The tilt adjustment mechanism includes an electric actuator, the fixed end of which is hinged to the frame, and the movable end of which is hinged to the left or right crossbeam.

8. The snail screening device according to claim 1, characterized in that, The frame is equipped with a protective cover that shields the sides and top of the sieve bucket and has a transparent viewing window.

9. The snail screening device according to claim 1, characterized in that, The vibrating screen assembly includes a screen and a vibrating motor. The vibrating motor is fixed at the bottom of the screen. The bottom of the screen is inclined downwards towards the front end. The screw outlet is located at the bottom of the screen and is covered with a screw outlet cover plate.

10. A snail screening device according to claim 2, characterized in that, The crossbeams are hollow inside, and each of the three crossbeams has multiple spray heads on the side near the screen bucket. The top crossbeam is connected to a water inlet pipe, and the two fixing rings have a guide cavity that connects the internal space of the three crossbeams.

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