Device and method for detecting rice pesticide residues

Abstract

The invention provides a device and method for detecting rice pesticide residues, and belongs to the field of pesticide residue detection equipment.The device comprises a shell and a servo motor, the servo motor penetrates through the middle of the side wall of the shell, a feeding pipe penetrates through the middle of the shell, and a material distributing mechanism is arranged below the middle position of the feeding pipe. According to the device, the inner barrel, the screen and the material distributing plate are arranged, materials in the inner barrel are screened through the screen, particles penetrating through the screen fall into the inner side of the material distributing plate, and for particles which do not meet the refining requirement, the particles are refined under the action of shearing force and friction force generated when the material distributing plate and the inner barrel rotate relative to each other; and meanwhile, the inner cylinder body also has displacement in the vertical direction, and the gap between the inner cylinder body and the material distributing plate is always unchanged, so that a good refining effect on particles is achieved under the organic cooperation of the material distributing plate and the inner cylinder body, and good working efficiency is ensured.

Description

Technical Field

[0001] This application relates to the technical field of pesticide residue detection equipment, and particularly relates to a device and method for detecting pesticide residues in rice. Background Technique

[0002] As one of the main food crops, rice has rich nutritional value and economic value. The relationship between high-quality rice and pesticide residues is complex and mutually influential. There may be contradictory situations such as the abuse of pesticides threatening quality and safety, or situations where quality can be improved through scientific management for coordinated prevention and control. High-quality rice and pesticide residues are not irreconcilable. Through the breeding of resistant varieties, precise prevention and control technologies, precise detection technologies, and the management of the entire industrial chain, both the quality of rice can be guaranteed and the pesticide residues can be controlled within the safety threshold. By continuously innovating the technology of rice pesticide residue detection devices, precise monitoring, risk prevention and control, and standardized production form a closed-loop linkage, promoting the upgrading of the rice industry from "yield-oriented" to "emphasizing both quality and safety". At the same time, the detection technology will also become one of the core competitiveness for high-quality rice to participate in global competition; Among the currently disclosed pesticide residue detection technologies, the adjustable intelligent detection mechanism suitable for outdoor agricultural product pesticide residue detection with the publication number of CN116593658A is provided with a crushing mechanism on the detection mechanism. When inspecting the pesticide residues in fruits and vegetables, the agricultural products inside the crushing bin can be quickly cut and crushed by the crushing rod, and the crushing rod can continuously move up and down to adjust the position, cutting large agricultural products into small particles more efficiently. Then, through the rotation of the grinding block, the small particles of agricultural products can be ground, and the juice of the agricultural products can be completely squeezed out, and the pesticide residues in all parts of the agricultural products can be extracted, making the data detected by the agricultural product pesticide detector more accurate; However, when using this device in the actual detection process, under the action of the slider and the wavy chute, the gap between the grinding block and the crushing bin is in a changing process. When the gap between the grinding block and the crushing bin increases, it is difficult to play the grinding role, resulting in a lower working efficiency; Therefore, in view of the above problems, a device and method for detecting pesticide residues in rice are provided. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a device and method for detecting pesticide residues in rice to solve the problem of low grinding efficiency proposed in the above background technique.

[0004] To solve the above technical problems, this application provides the following technical solutions: A device and method for detecting pesticide residues in rice, including a housing and a servo motor. The middle part of the side wall of the housing is penetrated by the servo motor, and the middle part of the housing is penetrated by a feed pipe. A material distribution mechanism is arranged below the middle position of the feed pipe; The material distribution mechanism includes: an inner cylinder body, a crushing knife, a screen, a connecting block, a connecting groove and a limiting groove. The inner cylinder body is arranged through the middle through hole of the feed pipe. The crushing knife is arranged through the bottom side wall of the inner cylinder body. The screen is arranged on the outer peripheral side wall of the inner cylinder body. The connecting block is arranged on the side wall of the inner cylinder body. The outer side of the connecting block is clamped with the connecting groove. One end of the connecting groove is connected to the bottom surface of the feed pipe. The limiting groove is arranged on one side of the bottom of the inner cylinder body A screening mechanism is further arranged at the bottom of the inner cylinder body. The screening mechanism includes: an outer cylinder body, a material distribution plate, a crankshaft, a sliding sleeve, a connecting rod and a wedge block. The outer cylinder body with a hollow bottom is sleeved on the outer middle part of the inner cylinder body. The material distribution plate is arranged on the inner bottom surface of the outer cylinder body. The crankshaft is fixedly connected to the center of the bottom of the outer cylinder body. The sliding sleeve is clamped on the outer side of the connecting journal of the crankshaft. The connecting rod is fixed on the side wall of the sliding sleeve. The wedge block is connected to the top of the connecting rod. The wedge block is in sliding fit with the limiting groove; A transmission relationship is established between the servo motor and the crankshaft, and a transmission relationship is established between the crankshaft and the crushing knife. A pesticide detector is arranged on one side of the bottom of the housing.

[0005] Preferably, the top surface of the inner cylinder body is flush with the inner bottom surface of the feed pipe. The inner side wall of the inner cylinder body is annularly provided with a screen. The bottom edge of the screen is flush with the inner bottom surface of the inner cylinder body. The top edge of the screen is higher than the top edge of the crushing knife.

[0006] Preferably, the number of the limiting grooves is two. The two limiting grooves are symmetrically arranged on both sides of the bottom of the inner cylinder body. The bottom opening groove of the limiting groove includes an inclined wall surface.

[0007] Preferably, a discharge channel is arranged between the vertical wall surface of the outer cylinder body and the vertical wall surface of the material distribution plate. The height of the material distribution plate is one-half of the height of the outer cylinder body. The material distribution plate is annular. The material distribution plate is sleeved on the outer lower position of the inner cylinder body. The upper edge of the material distribution plate is higher than the upper edge of the screen.

[0008] Preferably, the inner side wall surface of the material distribution plate is embedded with equally spaced and distributed grinding blocks. The grinding blocks are annular. The material distribution plate and the outer cylinder body are coaxially arranged.

[0009] Preferably, a diversion plate is arranged in the middle of the outer side wall of the material distribution plate. The diversion plates are evenly distributed around the circumference of the material distribution plate.

[0010] Preferably, the pesticide detector is arranged below the outer cylinder body. One side of the top of the pesticide detector is provided with a feed inlet, and the top edge of the pesticide detector is connected with an inclined aggregate plate.

[0011] Preferably, a limiting mechanism is arranged at the inner top of the housing. The limiting mechanism includes: an electric push rod and a pressing plate. One end of the electric push rod is fixed to the inner top of the housing, and the pressing plate is fixed to the other end of the electric push rod. The pressing plate is coaxially arranged with the inner cylinder body.

[0012] Preferably, a groove is formed at the center of the bottom of the pressing plate, and the diameter of the groove at the bottom of the pressing plate is the same as that of the crushing knife.

[0013] On the other hand, the present application provides a method for a device for detecting pesticide residues in rice: S1: Place the rice to be detected into the feed pipe, and place the part of the rice to be detected above the inner cylinder body. S2: Start the servo motor to drive the crankshaft and the crushing knife to rotate. During the rotation of the crankshaft, the sliding sleeve is driven to move horizontally back and forth. During the horizontal movement of the sliding sleeve, the wedge block is driven to squeeze the limiting groove. S3: The limiting groove drives the inner cylinder body to move vertically into the feed pipe, and the edge of the inner cylinder body cuts and segments the rice. S4: The segmented rice is crushed by the rotating crushing knife, and the crushed rice is screened through the sieve to screen out the particles that meet the requirements. S5: The rotation of the crankshaft drives the outer cylinder body and the material distribution plate to rotate, and the rotating material distribution plate further impacts and disperses the particles screened out from the sieve. S6: The falling particles enter the detection port of the pesticide detector for detection to judge the amount of pesticide residues.

[0014] Compared with the prior art, the present application has at least the following beneficial effects:

[0015] In the present invention, by arranging the inner cylinder body, the sieve and the material distribution plate, the materials in the inner cylinder body are screened through the sieve, and the particles passing through the sieve fall into the inner side of the material distribution plate. For the particles that do not meet the refinement requirements, they are refined under the action of the shear force and friction force generated when the material distribution plate and the inner cylinder body rotate relative to each other. At the same time, the inner cylinder body also has a vertical displacement, and the gap between the inner cylinder body and the material distribution plate remains unchanged all the time. With the organic cooperation of the material distribution plate and the inner cylinder body, a good refinement effect on the particles is achieved, and good working efficiency is ensured.

[0016] In the present invention, by providing a feed pipe, an inner cylinder, a crankshaft, a sliding sleeve, a connecting rod, a wedge block and a limiting groove, through the organic cooperation of the wedge block and the limiting groove, the up-and-down displacement of the inner cylinder is realized. The rice plants in the feed pipe are extruded by the top surface of the inner cylinder. With the organic cooperation between the outer edge of the top surface of the inner cylinder and the bottom through hole of the feed pipe, the rice plants in the feed pipe are cut into small sections, which is beneficial for subsequent crushing and refinement.

[0017] In the present invention, by providing a feed pipe, an electric push rod and a pressing plate, when the electric push rod extends, it drives the pressing plate to pass through the middle through hole of the feed pipe. The pressing plate can not only extrude and limit the materials in the feed pipe, but also generate a shearing force when the bottom edge of the pressing plate moves relative to the inner edge of the top of the inner cylinder, which can be used to cut the rice plants.

[0018] In the present invention, by providing an outer cylinder, a material distributing plate and a guiding plate, the guiding plate in the discharge channel rotates following the material distributing plate and the outer cylinder. During the rotation process, the inclined surface designed on the guiding plate itself has an extrusion effect on the air flow in the discharge channel, so as to drive the air flow to flow, further quickly discharge the materials, and disperse the materials through the air flow to prevent the materials from agglomerating. The uniformly arranged guiding plates can also extrude and impact the materials in the discharge channel to disperse them. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present disclosure, and together with the specification are further used to explain the principles of the present disclosure and enable those skilled in the relevant art to implement and use the present disclosure.

[0020] Figure 1 is a schematic diagram of the overall structure in the present application; Figure 2 is a sectional view of the housing structure in the present application; Figure 3 is a schematic diagram of the crankshaft structure in the present application; Figure 4 is a schematic diagram of the feed pipe structure in the present application; Figure 5 is a schematic diagram of the overall structure of the inner cylinder in the present application; Figure 6 is a sectional view of the inner cylinder structure in the present application; Figure 7 is a sectional view of the outer cylinder structure in the present application; Figure 8 is a schematic diagram of the aggregate trough structure in the present application; Figure 9 is a sectional view of the pressing plate structure in the present application; [Reference Signs] 1. Housing; 101. Servo motor; 102. Feed pipe; 103. Pesticide detector; 1031. Aggregate plate; 2. Inner cylinder; 201. Crushing knife; 202. Sieve mesh; 203. Connecting block; 204. Connecting groove; 205. Limiting groove; 3. Outer cylinder; 301. Material distributing plate; 3011. Grinding block; 3012. Flow guiding plate; 302. Crankshaft; 303. Sliding sleeve; 304. Connecting rod; 305. Wedge block; 4. Electric push rod; 401. Pressing plate. Detailed implementation manners

[0021] The following describes in detail a device and method for detecting pesticide residues in rice provided by the present application in conjunction with the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present application.

[0022] As Figures 1-6 shown, a device and method for detecting pesticide residues in rice provided by an embodiment of the present application includes a housing 1 and a servo motor 101. The servo motor 101 penetrates through the middle part of the side wall of the housing 1, and a feed pipe 102 penetrates through the middle of the housing 1. A material distributing mechanism is arranged below the middle position of the feed pipe 102; The material distributing mechanism includes: an inner cylinder 2, a crushing knife 201, a sieve mesh 202, a connecting block 203, a connecting groove 204 and a limiting groove 205. The inner cylinder 2 is arranged through the middle through hole of the feed pipe 102. The crushing knife 201 penetrates through the bottom side wall of the inner cylinder 2. The sieve mesh 202 is arranged on the outer peripheral side wall of the inner cylinder 2. The connecting block 203 is arranged on the side wall of the inner cylinder 2. The outside of the connecting block 203 is clamped with the connecting groove 204. One end of the connecting groove 204 is connected to the bottom surface of the feed pipe 102. The limiting groove 205 is arranged on one side of the bottom of the inner cylinder 2 A screening mechanism is further arranged at the bottom of the inner cylinder 2. The screening mechanism includes: an outer cylinder 3, a material distributing plate 301, a crankshaft 302, a sliding sleeve 303, a connecting rod 304 and a wedge block 305. The outer cylinder 3 with a hollow bottom is sleeved on the outer middle part of the inner cylinder 2. The material distributing plate 301 is arranged on the inner bottom surface of the outer cylinder 3. The crankshaft 302 is fixedly connected to the center of the bottom of the outer cylinder 3. The sliding sleeve 303 is clamped on the outer side of the connecting journal of the crankshaft 302. The connecting rod 304 is fixed to the side wall of the sliding sleeve 303. The wedge block 305 is connected to the top of the connecting rod 304. The wedge block 305 and the limiting groove 205 are in sliding fit; The servo motor 101 has a transmission relationship with the crankshaft 302, and the crankshaft 302 has a transmission relationship with the crushing knife 201. A pesticide detector 103 is arranged on one side of the bottom of the housing 1; A visual window is provided at the upper position of the front side of the housing 1. Through the visual window, the interior of the housing 1 can be effectively observed. Both ends of the feed pipe 102 are open, and through holes are provided above and below the middle of the feed pipe 102; During use, insert the rice plants to be detected into the feed pipe 102 so that the part to be detected is at the top of the inner cylinder 2. The rice plants are limited by the feed pipe 102. Start the servo motor 101 to drive the crankshaft 302 and the crushing knife 201 to rotate. During the rotation of the crankshaft 302, the sliding sleeve 303 is horizontally reciprocated under the extrusion of the connecting journal of the crankshaft 302, driving the connecting rod 304 and the wedge block 305 to reciprocate horizontally. The wedge block 305 is clamped inside the limiting groove 205. By squeezing the limiting groove 205 through the inclined surface of the wedge block 305, the limiting groove 205 moves in the vertical direction, and the limiting groove 205 drives the inner cylinder 2 to move in the vertical direction. The top surface of the inner cylinder 2 squeezes the rice plants in the feed pipe 102. With the organic cooperation between the outer edge of the top surface of the inner cylinder 2 and the bottom through hole of the feed pipe 102, the rice plants in the feed pipe 102 are cut into small segments; The small segments of rice fall into the interior of the inner cylinder 2 under the action of their own gravity. At this time, as the crushing knife 201 rotates, the small segments of rice are crushed and refined. During this process, since the crushing knife 201 and the inner cylinder 2 are sealed by a sealing ring and the crushing knife 201 and the inner cylinder 2 can slide relative to each other, the crushing knife 201 is in a relative sliding process relative to the inner cylinder 2, so that the rice at different positions in the inner cylinder 2 can be broken and refined. Driven by the crushing knife 201, the refined particles move, including the particles moving towards the screen 202 under the action of centrifugal force, thus realizing the synchronous progress of crushing and screening, improving work efficiency. With the organic cooperation between the connecting block 203 and the connecting groove 204, the inner cylinder 2 is limited and guided; The particles passing through the screen 202 fall into the inner side of the distribution plate 301. The gap provided in the part of the distribution plate 301 that fits the outer wall of the inner cylinder 2 is the same as the diameter of the particles to be obtained. Therefore, for the particles that do not meet the refinement requirements, they will be refined under the action of the shear force and frictional force generated when the distribution plate 301 and the inner cylinder 2 rotate relative to each other. At the same time, the inner cylinder 2 also has a displacement in the vertical direction. Therefore, the force acting on this part of the particles is constantly changing, and the gap between the inner cylinder 2 and the distribution plate 301 remains unchanged. With the organic cooperation between the distribution plate 301 and the inner cylinder 2, a good refinement effect on the particles is achieved, and good work efficiency is ensured; Under the rotation of the crankshaft 302, the distribution plate 301 and the outer cylinder 3 are driven to rotate continuously. The refined particles can be discharged through the hollow outer cylinder 3, and the falling particles enter the detection port of the pesticide detector 103 for detection to judge the pesticide residue amount.

[0023] In this embodiment, as Figures 2-9 shown. The top surface of the inner cylinder 2 is flush with the inner bottom surface of the feed pipe 102. The inner side wall of the inner cylinder 2 is annularly arrayed with a screen 202. The bottom edge of the screen 202 is flush with the inner bottom surface of the inner cylinder 2. The top edge of the screen 202 is set higher than the top edge of the crushing knife 201; The inner cylinder 2 generates a vertical movement under the organic cooperation of the limiting groove 205 and the wedge block 305. At the same time, the feed pipe 102 is a tubular structure with a rectangular opening. The inner cylinder 2 moves relative to the two horizontal parts of the feed pipe 102. The inner cylinder 2 can move upward to penetrate the top surface through hole of the feed pipe 102, and can cut the rice plants in the feed pipe 102 under the action of pressure, so as to facilitate subsequent crushing treatment; The annularly arrayed screen 202 effectively utilizes the area of the inner side wall of the inner cylinder 2, thereby quickly screening out refined and qualified particles, reducing the situation of repeated crushing of particles, enabling the crushing knife 201 to efficiently crush and refine the particles that do not meet the refinement requirements. The bottom edge of the screen 202 is flush with the bottom surface of the inner cylinder 2, which helps to discharge the materials in the inner cylinder 2. However, the materials are often piled up at the corners of the inner cylinder 2 driven by the crushing knife 201. Therefore, designing the top edge of the screen 202 higher than the crushing knife 201 can help maintain good discharge efficiency.

[0024] The number of the limiting grooves 205 is two. The two limiting grooves 205 are symmetrically arranged on both sides of the bottom of the inner cylinder 2. The bottom opening groove of the limiting groove 205 includes an inclined wall surface; The two limiting grooves 205 correspond to the two directions of the horizontal reciprocating movement of the sliding sleeve 303. The inclined surface of the limiting groove 205 can be attached to the inclined surface of the wedge block 305 to ensure the contact area, thereby ensuring the smoothness of the transmission.

[0025] A discharge channel is provided between the vertical wall surface of the outer cylinder 3 and the vertical wall surface of the material distribution plate 301. The height of the material distribution plate 301 is one-half of the height of the outer cylinder 3. The material distribution plate 301 is annular. The material distribution plate 301 is sleeved on the outer side below the inner cylinder 2. The upper edge of the material distribution plate 301 is set higher than the upper edge of the screen 202; The materials falling from the outer side of the top of the material distribution plate 301 fall into the discharge channel under the action of centrifugal force. A height difference is designed between the top surface of the material distribution plate 301 and the top surface of the outer cylinder 3, which can prevent the materials from flowing outward and ensure that the discharge direction of the materials is downward. Designing the material distribution plate 301 as annular and setting the material distribution plate 301 higher than the upper edge of the screen 202 can prevent the situation that the materials directly fall after being discharged from the screen 202, enabling the material distribution plate 301 to be organically combined with the inner cylinder 2 to refine and form the materials that do not meet the refinement requirements.

[0026] The inner wall surface of the material distribution plate 301 is embedded with grinding blocks 3011 that are evenly spaced. The grinding blocks 3011 are annular, and the material distribution plate 301 is coaxially arranged with the outer cylinder 3. The grinding blocks 3011 are arranged inside the material distribution plate 301 to increase the roughness of the surface, increase the friction coefficient, improve the grinding efficiency and effect. The grinding blocks 3011 are annular, corresponding to the moving direction of the material, ensuring good grinding of the material. At the same time, the coaxial arrangement improves the rotational stability of the material distribution plate 301.

[0027] The inner wall surface of the material distribution plate 301 is embedded with grinding blocks 3011 that are evenly spaced. The grinding blocks 3011 are annular, and the material distribution plate 301 is coaxially arranged with the outer cylinder 3 In the middle of the outer wall of the material distribution plate 301, there is a guide plate 3012, and the guide plates 3012 are evenly distributed circumferentially around the material distribution plate 301; The guide plates 3012 in the discharge channel rotate with the material distribution plate 301 and the outer cylinder 3. During the rotation, the inclined surface designed on the guide plate 3012 has an extrusion effect on the air flow in the discharge channel, so as to drive the air flow to move, further quickly discharge the material, and disperse the material through the air flow to prevent the material from agglomerating. The evenly arranged guide plates 3012 can also exert an extrusion impact on the material in the discharge channel.

[0028] The pesticide detector 103 is arranged below the outer cylinder 3. One side of the top of the pesticide detector 103 is provided with a feed inlet, and the top edge of the pesticide detector 103 is connected with an inclined aggregate plate 1031; The pesticide detector 103 is a mass spectrometer, which can detect the pesticide residues in the material. The inclined aggregate plate 1031 collects the material discharged from the bottom of the outer cylinder 3, and the inclined surface promotes the flow of the material, so that the material enters the detection port of the pesticide detector 103, improving the convenience.

[0029] At the inner top of the housing 1, a limiting mechanism is provided. The limiting mechanism includes: an electric push rod 4 and a pressing plate 401. One end of the electric push rod 4 is fixed to the inner top of the housing 1, and the pressing plate 401 is fixed to the other end of the electric push rod 4. The pressing plate 401 is coaxially arranged with the inner cylinder 2; When the electric push rod 4 extends, it drives the pressing plate 401 to move towards the inner cylinder 2 until the pressing plate 401 extends into the inner part of the inner cylinder 2, extruding the material in the inner cylinder 2, so that the material moves concentratedly towards the crushing knife 201, enabling the material to fully contact the crushing knife 201; When the electric push rod 4 extends, it drives the pressing plate 401 to pass through the central through hole of the feed pipe 102. The pressing plate 401 can not only extrude and limit the material in the feed pipe 102, but also when the bottom edge of the pressing plate 401 moves relative to the top inner edge of the inner cylinder 2, the shearing force generated can be used to cut the rice plants.

[0030] A groove is provided at the center of the bottom of the pressing plate 401, and the diameter of the bottom groove of the pressing plate 401 is the same as the diameter of the crushing knife 201; The bottom surface of the pressing plate 401 can be close to the inner bottom surface of the inner cylinder 2. Under the action of pressure, the materials in the inner cylinder 2 are extruded, and it will not interfere with the rotation of the crushing knife 201, making it more flexible to use.

[0031] Furthermore, a detection method for a device for detecting pesticide residues in rice is as follows: S1: Place the rice to be detected into the feed pipe 102, and place the part of the rice to be detected above the inner cylinder 2; S2: Start the servo motor 101 to drive the crankshaft 302 and the crushing knife 201 to rotate. During the rotation of the crankshaft 302, the sliding sleeve 303 is driven to reciprocate horizontally. During the horizontal movement of the sliding sleeve 303, the wedge block 305 is driven to squeeze the limiting groove 205; S3: The limiting groove 205 drives the inner cylinder 2 to move vertically into the feed pipe 102, and the rice is cut and segmented by the edge of the inner cylinder 2; S4: The segmented rice is crushed by the rotating crushing knife 201, and the crushed rice is screened by the screen 202 to screen out the particulate matter that meets the requirements; S5: The rotation of the crankshaft 302 drives the outer cylinder 3 and the material distribution plate 301 to rotate, and the rotating material distribution plate 301 further impacts and disperses the particulate matter screened out from the screen 202; S6: The falling particulate matter enters the detection port of the pesticide detector 103 for detection to determine the pesticide residue amount.

Claims

1. A device for detecting pesticide residues in rice, comprising a housing (1) and a servo motor (101), wherein the servo motor (101) penetrates through the middle of the side wall of the housing (1), and is characterized in that, A feed pipe (102) passes through the middle of the housing (1), and a material distribution mechanism is arranged below the middle position of the feed pipe (102); The material distribution mechanism includes: an inner cylinder (2), a crushing knife (201), a sieve mesh (202), a connecting block (203), a connecting groove (204) and a limiting groove (205). The inner cylinder (2) is arranged through the middle through hole of the feed pipe (102). The crushing knife (201) passes through the bottom side wall of the inner cylinder (2). The sieve mesh (202) is arranged on the outer peripheral side wall of the inner cylinder (2). The connecting block (203) is arranged on the side wall of the inner cylinder (2). The outer side of the connecting block (203) is clamped with the connecting groove (204). One end of the connecting groove (204) is connected to the bottom surface of the feed pipe (102). The limiting groove (205) is arranged on one side of the bottom of the inner cylinder (2). A screening mechanism is further arranged at the bottom of the inner cylinder (2). The screening mechanism includes: an outer cylinder (3), a material distribution plate (301), a crankshaft (302), a sliding sleeve (303), a connecting rod (304) and a wedge block (305). The outer cylinder (3) with a hollow bottom is sleeved on the outer middle part of the inner cylinder (2). The material distribution plate (301) is arranged on the inner bottom surface of the outer cylinder (3). The crankshaft (302) is fixedly connected to the center of the bottom of the outer cylinder (3). The sliding sleeve (303) is clamped on the outer side of the connecting journal of the crankshaft (302). The connecting rod (304) is fixed to the side wall of the sliding sleeve (303). The wedge block (305) is connected to the top of the connecting rod (304). The wedge block (305) is in sliding fit with the limiting groove (205); A transmission relationship is established between the servo motor (101) and the crankshaft (302). A transmission relationship is established between the crankshaft (302) and the crushing knife (201). A pesticide detector (103) is arranged on one side of the bottom of the housing (1).

2. The device for detecting rice pesticide residues according to claim 1, wherein: The top surface of the inner cylinder (2) is flush with the inner bottom surface of the feed pipe (102). The sieve meshes (202) are annularly arrayed on the inner side wall of the inner cylinder (2). The bottom edge of the sieve mesh (202) is flush with the inner bottom surface of the inner cylinder (2). The top edge of the sieve mesh (202) is higher than the top edge of the crushing knife (201).

3. The device for detecting pesticide residues in rice according to claim 1, wherein: The number of the limiting grooves (205) is two. The two limiting grooves (205) are symmetrically arranged on both sides of the bottom of the inner cylinder (2). The bottom opening groove of the limiting groove (205) includes an inclined wall surface.

4. The device for detecting pesticide residues in rice according to claim 1, wherein: A discharge channel is arranged between the vertical wall surface of the outer cylinder (3) and the vertical wall surface of the material distribution plate (301). The height of the material distribution plate (301) is one half of the height of the outer cylinder (3). The material distribution plate (301) is annular. The material distribution plate (301) is sleeved on the outer lower position of the inner cylinder (2). The upper edge of the material distribution plate (301) is higher than the upper edge of the sieve mesh (202).

5. The device for detecting rice pesticide residues according to claim 1, characterized in that: The inner wall surface of the material distribution plate (301) is embedded with grinding blocks (3011) distributed at equal intervals. The grinding blocks (3011) are annular, and the material distribution plate (301) is coaxially arranged with the outer cylinder (3).

6. The device for detecting pesticide residues in rice according to claim 1, characterized in that: A flow guide plate (3012) is arranged in the middle of the outer wall of the material distribution plate (301), and the flow guide plate (3012) is evenly distributed circumferentially around the material distribution plate (301).

7. The device for detecting pesticide residues in rice according to claim 1, characterized in that: The pesticide detector (103) is arranged below the outer cylinder (3). One side of the top of the pesticide detector (103) is provided with a feed inlet, and the top edge of the pesticide detector (103) is connected with an inclined aggregate plate (1031).

8. The device for detecting pesticide residues in rice according to claim 1, characterized in that: A limiting mechanism is arranged at the inner top of the housing (1). The limiting mechanism includes: an electric push rod (4) and a pressing plate (401). One end of the electric push rod (4) is fixed to the inner top of the housing (1), and the pressing plate (401) is fixed to the other end of the electric push rod (4). The pressing plate (401) is coaxially arranged with the inner cylinder (2).

9. The device for detecting pesticide residues in rice according to claim 8, characterized in that: A groove is opened at the center of the bottom of the pressing plate (401), and the diameter of the groove at the bottom of the pressing plate (401) is the same as the diameter of the crushing knife (201).

10. The detection method of the device for detecting rice pesticide residues according to any one of claims 1-9, characterized in that: S1: Put the rice to be detected into the feed pipe (102), and place the part of the rice to be detected above the inner cylinder (2). S2: Start the servo motor (101) to drive the crankshaft (302) and the crushing knife (201) to rotate. During the rotation of the crankshaft (302), the sliding sleeve (303) is driven to move horizontally back and forth. During the horizontal movement of the sliding sleeve (303), the wedge block (305) is driven to squeeze the limiting groove (205). S3: The limiting groove (205) drives the inner cylinder (2) to move vertically into the feed pipe (102), and the edge of the inner cylinder (2) cuts and segments the rice. S4: The segmented rice is crushed by the rotating crushing knife (201), and the crushed rice is screened by the sieve (202) to screen out the particles that meet the requirements. S5: The rotation of the crankshaft (302) drives the outer cylinder (3) and the material distribution plate (301) to rotate, and the rotating material distribution plate (301) further impacts and disperses the particles screened out from the sieve (202). S6: The falling particles enter the detection port of the pesticide detector (103) for detection to judge the pesticide residue amount.

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