Method for detecting heavy metals in rice

Abstract

The invention discloses a rice heavy metal detection method, and relates to the technical field of rice detection.The detection method comprises the following steps of intermittent blanking of sampled rice, rice husk removal before detection, rice screening and rice heavy metal content detection, according to the rice heavy metal detection method, under the linkage cooperation of multiple structures, the movement of the movable frame in the horizontal direction is realized, so that the separation plate is driven by the connecting rod to intermittently separate the discharged rice in the discharging pipe. The screen can be driven to transversely move in a reciprocating manner in the horizontal direction, and meanwhile, small-amplitude shaking in the vertical direction can be performed, so that worker shaking can be simulated, and gravel and granular metal in a rice sample can be screened out by shaking the screen; the influence of gravel and metal particles doped in the rice sample on subsequent rice heavy metal content detection is avoided, and the accuracy of a rice sample heavy metal content detection result is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of rice detection, in particular to a method for detecting heavy metals in rice. Background Art

[0002] Rice, which enters the spleen, stomach and lung meridians, has the functions of replenishing qi, nourishing yin and moistening the lungs, strengthening the spleen and stomach, and eliminating thirst. Ancient health experts also advocated "eating porridge in the morning" to produce body fluids. Therefore, patients with cough and constipation caused by lung yin deficiency can use rice to cook porridge in the morning and evening. Drinking rice porridge regularly can help the production of body fluids and relieve dry skin and other discomforts to a certain extent. If you add some pears when cooking porridge, the effect of Chinese medicine health care will be better.

[0003] Rice has now become the staple food in most areas. Therefore, the quality inspection of rice is essential, and the detection of heavy metals in rice is an important part of rice quality inspection. Before the heavy metal detection of rice, it is necessary to carry out certain pretreatment, that is, to screen and remove impurities such as sand, gravel, granular metal, and rice husk mixed in the rice, so as to ensure that in the subsequent heavy metal detection process, the influence of impurities such as sand, gravel, and small granular metal on the detection process is excluded.

[0004] At present, the impurity cleaning method before the heavy metal detection of rice in the prior art is often that workers use handheld sieves to perform manual screening. However, when there are many rice samples to be tested, the efficiency of manual screening is low and the screening and removal effect of impurities in the rice samples is poor, which is not conducive to use. Summary of the invention

[0005] The object of the present invention is to provide a method for detecting heavy metals in rice to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for detecting heavy metals in rice, the detection method comprising the following steps: Intermittent unloading of sampled rice: Turn on the motor to drive the rotating shaft to rotate, so that the moving frame moves back and forth in the horizontal direction, so that the connecting rod drives the blocking plate to intermittently block the unloading of rice in the unloading pipe, thereby completing the intermittent unloading of rice in the unloading pipe; Rice husk removal and rice screening before detection: After the motor is turned on, as the barrier plate moves back and forth, under the action of the hinged plate 2, the piston rod drives the piston plate to perform piston motion in the piston cylinder, sucking in the outside air from the air inlet pipe and spraying it out from the multiple air outlets on the surface of the air outlet pipe; After the motor drives the rotating shaft to rotate one circle, it stops rotating for a short period of time. At this time, the baffle plate is just in a state of blocking the feeding pipe. The air discharged from the piston cylinder can also have sufficient time to spray out through multiple air outlets onto the rice above the baffle plate, blowing the rice husk mixed in the rice into the collection box. Moreover, after the motor is turned on, the cam will be driven to rotate synchronously with the rotation of the rotating shaft. Under the linkage cooperation of multiple structures, the screen is driven to move back and forth in the horizontal direction and to shake slightly in the vertical direction, simulating the worker shaking and shaking the screen to screen out the sand and granular metal in the rice sample. The rice sample without impurities after screening will fall onto the guide plate and be discharged from the discharge port on the surface of the processing box along the guide plate. Detection of heavy metal content in rice: Collect and grind the rice sample that does not contain impurities discharged from the discharge port, pour the reaction solvent into the ground rice to mix, centrifuge the mixed solvent, and then put it into the detection instrument to detect the heavy metal content. At this point, the heavy metal content detection of rice is completed.

[0007] Optionally, the upper surface of the processing box is fixedly connected to a feed pipe, the upper surface of the feed pipe is fixedly connected to a feed hopper, and the lower surface of the feed pipe is fixedly connected to a cover body; The inner wall of the processing box is slidably connected to a screen frame, the inner wall of the screen frame is fixedly connected to four symmetrically arranged triangular limit blocks, and the screen frame is slidably connected to the screen via the four triangular limit blocks; The processing box is provided with a driving component, a material discharge component and an auxiliary component.

[0008] Optionally, the driving component is used to drive the screen to move horizontally in the left and right directions while performing a small upward and downward displacement; The feeding component is in driving connection with the driving component, and is used to control the rice in the feeding pipe to intermittently fall onto the screen; The auxiliary component is in driving connection with the feeding component and is used for cleaning the impurities mixed in the rice when the rice stays in the feeding pipe.

[0009] Optionally, the driving component is used to drive the screen to move horizontally in the left and right directions while performing a small upward and downward displacement; The feeding component is in driving connection with the driving component, and is used to control the rice in the feeding pipe to intermittently fall onto the screen; The auxiliary component is in driving connection with the feeding component and is used for cleaning the impurities mixed in the rice when the rice stays in the feeding pipe.

[0010] Optionally, the driving component further comprises a rectangular notch provided on the inner wall of the processing box, a moving block is slidably connected to the inner wall of the rectangular notch, an articulated block 1 is provided at the end of the moving block extending out of the rectangular notch, an abutment rod is fixedly connected to the lower surface of the articulated block 1, an articulated block 2 is provided on the side of the screen, and an articulated plate 1 is articulated between the articulated block 1 and the articulated block 2; A fixed block is fixedly connected to the inner wall of the processing box, a limiting rod is fixedly connected to the upper surface of the fixed block, the limiting rod passes through the screen frame and is slidably connected thereto, and a second spring is commonly provided between the screen frame and the fixed block.

[0011] Optionally, the blanking component comprises a rotating plate fixedly connected to the end of the rotating shaft, a moving column is fixedly connected to the surface of the rotating plate, and a moving frame is slidably connected to the outer surface of the moving column; The inner wall of the feeding tube is slidably connected with a blocking plate, and one side of the blocking plate extending out of the feeding tube is fixedly connected with a connecting rod, and the end of the connecting rod is fixedly connected with the moving frame; Two symmetrically arranged sliding blocks are fixedly connected to the surface of the baffle plate, and a sliding groove for the sliding blocks to slide and fit into is provided on the inner wall of the discharge pipe.

[0012] Optionally, the auxiliary component includes a piston cylinder fixedly mounted on the upper surface of the processing box, the surface of the piston cylinder is fixedly connected with an air inlet pipe and a connecting pipe, the surface of the air inlet pipe is provided with a one-way valve 1, the surface of the connecting pipe is provided with a one-way valve 2, the inner wall of the feed pipe is fixedly mounted with an air outlet pipe, the surface of the air outlet pipe is evenly provided with a plurality of air outlets, the end of the connecting pipe is fixedly connected with the air outlet pipe, the inner wall of the piston cylinder is slidably connected with a piston plate, the surface of the piston plate is fixedly connected with a piston rod, and the end of the piston rod extending out of the piston cylinder is provided with a hinge block 3; A connecting block is fixedly connected to the surface of the blocking plate, an end of the connecting block is fixedly connected to an articulated block four, and an articulated plate two is articulated between the articulated block three and the articulated block four; The surface of the feeding pipe is fixedly connected to a collecting box, the inner wall of the feeding pipe is fixedly connected to a material guide block, and the surface of the collecting box is hinged with a door body.

[0013] Optionally, a control panel is provided on the outer surface of the processing box, a material discharge port is provided on the surface of the processing box, and a material guide plate is provided on the inner wall of the processing box.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention starts the motor to drive the rotating shaft to rotate, and under the linkage cooperation of multiple structures, drives the screen to move back and forth in the horizontal direction and shake slightly in the vertical direction, so as to simulate the shaking and shaking of the screen by workers to screen out the sand and gravel and granular metal in the rice sample, thereby avoiding the problem of rice falling from the feeding pipe onto the screen for screening and filtration accumulating at the same position of the screen to cause clogging of the screen, and having a good screening effect on rice. Compared with traditional manual screening, the screening efficiency is also higher, and the influence of sand and gravel and metal particles mixed in the rice sample on the subsequent heavy metal content detection of rice is avoided, thereby ensuring the accuracy of the heavy metal content detection result of the rice sample.

[0015] 2. After the motor is turned on, the present invention drives the moving frame to reciprocate in the horizontal direction as the rotating shaft rotates, so that the connecting rod drives the blocking plate to intermittently block the discharge of rice in the discharge pipe, thereby completing the intermittent discharge of rice in the discharge pipe. Compared with the continuous drop of rice into the processing box through the discharge pipe, the intermittent discharge can prevent the screen from receiving too much rice at one time, reduce the load of the screen when screening rice, ensure the long-term use of the screen, and adapt to the continuous screening operation of rice samples when the amount of rice samples is large, ensure the subsequent heavy metal detection operation of rice samples, and improve the efficiency of heavy metal detection of rice samples.

[0016] 3. After the motor is turned on, the present invention causes the piston rod to drive the piston plate to perform piston motion in the piston cylinder as the barrier plate reciprocates under the action of the hinged plate 2, so that external air can be sucked in from the air inlet pipe and ejected from multiple air outlets on the surface of the air outlet pipe, so that the rice husks in the rice sample can be cleaned before the screening operation of the screen, thereby avoiding the problem that the rice husks are attached to the surface of the screen when the screen is screening rice and are difficult to clean, thereby affecting the normal screening of the rice sample by the screen, thereby further ensuring the long-term use of the screen and also ensuring the continuity of subsequent heavy metal detection of rice samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a flowchart of the use of the present invention; Figure 2 is an axonometric view of the structure of the present invention; Figure 3 It is a cross-sectional view of the processing box structure in the present invention; Figure 4 It is a schematic diagram of the movable frame structure in the present invention; Figure 5 It is a schematic diagram of the baffle structure in the present invention; Figure 6 It is a cross-sectional view of the feeding pipe structure in the present invention; Figure 7For the present invention Figure 6 Enlarged view of point A in the middle.

[0018] In the figure: 1, processing box; 2, discharge port; 3, guide plate; 4, control panel; 5, feed pipe; 6, feed hopper; 7, air intake pipe; 8, piston cylinder; 9, cover; 10, screen; 11, triangular limit block; 12, screen frame; 13, fixed block; 14, limit rod; 15, spring 2; 16, support plate; 17, cam; 18, rotating shaft; 19, motor; 20, moving column; 21, moving frame; 22, connecting rod; 23, blocking plate; 24 1. Articulated block 2; 25. Articulated plate 1; 26. Articulated block 1; 27. Moving block; 28. Rectangular notch; 29. ​​Abutment rod; 30. Piston rod; 31. Articulated block 3; 32. Articulated plate 2; 33. Articulated block 4; 34. Connecting block; 35. Collecting box; 36. Door body; 37. Air outlet pipe; 38. Air outlet; 39. Connecting pipe; 40. One-way valve 2; 41. Piston plate; 42. Guide block; 43. Spring 1; 44. Slider; 45. Turning plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in 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.

[0020] Example: See Figures 1 to 7 The present invention provides a technical solution: a method for detecting heavy metals in rice is as follows: Intermittent unloading of sampled rice: Turn on the motor 19 to drive the rotating shaft 18 to rotate, so that the moving frame 21 can reciprocate in the horizontal direction, so that the connecting rod 22 drives the blocking plate 23 to intermittently block the unloading of rice in the unloading pipe 5, thereby completing the intermittent unloading of rice in the unloading pipe 5; Rice husk removal and rice screening before detection: After the motor 19 is turned on, as the barrier plate 23 reciprocates, under the action of the hinge plate 2 32, the piston rod 30 drives the piston plate 41 to perform piston motion in the piston cylinder 8, sucking in the outside air from the air inlet pipe 7 and ejecting it from the multiple air outlets 38 on the surface of the air outlet pipe 37; After the motor 19 drives the rotating shaft 18 to rotate one circle, it stops rotating for a short period of time. At this time, the blocking plate 23 is just in a state of blocking the feeding pipe 5. The air discharged from the piston cylinder 8 can also be sprayed onto the rice above the blocking plate 23 through the multiple air outlets 38 in sufficient time, and the rice husk mixed in the rice is blown into the collection box 35. Moreover, after the motor 19 is turned on, the cam 17 will be driven to rotate synchronously with the rotation of the rotating shaft 18. Under the linkage cooperation of multiple structures, the screen 10 is driven to move back and forth in the horizontal direction and to shake slightly in the vertical direction, simulating the worker shaking and shaking the screen 10 to screen out the sand and granular metal in the rice sample. The screened rice sample without impurities will fall onto the guide plate 3 and be discharged from the discharge port 2 along the guide plate 3. Detection of heavy metal content in rice: The rice sample free of impurities discharged from the discharge port 2 is collected and ground, and a reaction solvent is poured into the ground rice to mix, and the mixed solvent is centrifuged and then placed in a detection instrument for heavy metal content detection. At this point, the heavy metal content detection of rice is completed.

[0021] It is worth noting that the following components are used in the rice heavy metal detection method: The upper surface of the processing box 1 is fixedly connected with a feed pipe 5, the upper surface of the feed pipe 5 is fixedly connected with a feed hopper 6, and the lower surface of the feed pipe 5 is fixedly connected with a cover body 9; The inner wall of the processing box 1 is slidably connected with a screen frame 12, and the inner wall of the screen frame 12 is fixedly connected with four symmetrically arranged triangular limit blocks 11, and the screen frame 12 is slidably connected with the screen 10 through the four triangular limit blocks 11; Driving components, material unloading components and auxiliary components are arranged in the processing box 1 .

[0022] A control panel 4 is disposed on the outer surface of the processing box 1 , a material outlet 2 is opened on the surface of the processing box 1 , and a material guide plate 3 is disposed on the inner wall of the processing box 1 .

[0023] The driving component includes a support plate 16 fixedly connected to the inner wall of the processing box 1, a motor 19 is fixedly installed on the surface of the support plate 16, the output shaft of the motor 19 is fixedly connected to the rotating shaft 18, the surface of the rotating shaft 18 is fixedly connected to the cam 17, a spring 43 is commonly arranged between the screen 10 and the screen frame 12, and a telescopic rod is also commonly arranged between the screen 10 and the screen frame 12.

[0024] When this embodiment is used, Figure 3 As shown, the motor 19 is turned on to drive the rotating shaft 18 to rotate. As the rotating shaft 18 rotates, the cam 17 starts to rotate. As the cam 17 rotates, when the end of the cam 17 away from the rotating shaft 18 contacts the screen 10, the screen 10 is pushed to move to the left. At the same time, the spring 43 between the screen 10 and the screen frame 12 is also compressed. As the cam 17 continues to rotate, when the cam 17 is separated from the screen 10, the screen 10 is driven to move to the right and reset under the action of the elastic potential energy of the spring 43.

[0025] Furthermore, the driving component also includes a rectangular notch 28 opened on the inner wall of the processing box 1, the inner wall of the rectangular notch 28 is slidably connected with a moving block 27, the end of the moving block 27 extending out of the rectangular notch 28 is provided with a hinge block 26, the lower surface of the hinge block 26 is fixedly connected with an abutment rod 29, and the side of the screen 10 is provided with a hinge block 24, and a hinge plate 25 is hingedly connected between the hinge block 26 and the hinge block 24; A fixed block 13 is fixedly connected to the inner wall of the processing box 1, and a limit rod 14 is fixedly connected to the upper surface of the fixed block 13. The limit rod 14 passes through the screen frame 12 and is slidably connected thereto. A spring 15 is provided between the screen frame 12 and the fixed block 13.

[0026] like Figure 3 and Figure 4 As shown, after the motor 19 is turned on, as the screen 10 reciprocates in the horizontal direction, the hinge block 24 will reciprocate in the horizontal direction. Since the moving block 27 is limited and can only slide in the rectangular slot 28, under the hinged action of the hinge plate 1 25, the reciprocating movement of the screen 10 in the horizontal direction will cause the hinge block 1 26 to drive the abutment rod 29 to reciprocate in the vertical direction. As the abutment rod 29 moves downward, when the abutment rod 29 contacts the screen frame 12, the screen frame 12 will be pushed to move downward, and the spring 2 15 will also be compressed. When the abutment rod 29 moves upward to reset, the elastic potential energy of the spring 2 15 will drive the screen frame 12 to move upward to reset.

[0027] That is, after the motor 19 is turned on, through the linkage cooperation of multiple structures, the screen 10 can be reciprocated in the horizontal direction and can also be slightly shaken in the vertical direction, so as to simulate the worker shaking and shaking the screen 10, so as to avoid the problem that the rice dropped from the discharge pipe 5 onto the screen 10 for screening and filtration accumulates at the same position of the screen 10 and causes the screen 10 to be blocked. The screening effect on rice is good, and the sand and granular metal in the rice sample can be effectively screened out. The screened rice sample will pass through the screen 10 and fall onto the guide plate 3 below. The surface of the guide plate 3 is ground and polished, and the rice sample dropped on the guide plate 3 will be discharged from the discharge port 2 along the guide plate 3, so as to be able to carry out subsequent heavy metal detection operations.

[0028] It is worth noting that Figure 3 As shown, the thickness of the cam 17 is greater than the thickness of the screen 10. Therefore, when the screen 10 moves a small distance in the vertical direction, as the motor 19 continues to be turned on, the cam 17 can still contact the screen 10 and drive the screen 10 to move back and forth in the horizontal direction.

[0029] Furthermore, the blanking component includes a rotating plate 45 fixedly connected to the end of the rotating shaft 18, a moving column 20 is fixedly connected to the surface of the rotating plate 45, and a moving frame 21 is slidably connected to the outer surface of the moving column 20; The inner wall of the feeding tube 5 is slidably connected with a blocking plate 23, and one side of the blocking plate 23 extending out of the feeding tube 5 is fixedly connected with a connecting rod 22, and the end of the connecting rod 22 is fixedly connected with the moving frame 21; Two symmetrically arranged sliding blocks 44 are fixedly connected to the surface of the blocking plate 23 , and the inner wall of the discharge pipe 5 is provided with sliding grooves for the sliding blocks 44 to slide and fit into.

[0030] More specifically, when this embodiment is used: Figure 3 and Figure 4 As shown, after the motor 19 is turned on, as the shaft 18 rotates, the rotating plate 45 at the end of the shaft 18 will also start to rotate. As the rotating plate 45 rotates, the moving column 20 will move in a circle with the shaft 18 as the center and the length of the rotating plate 45 as the radius. Since the moving frame 21 is limited by the connecting rod 22 and the blocking plate 23 and can only move in the horizontal direction, the circular motion of the moving column 20 will cause the moving frame 21 to reciprocate in the horizontal direction. As the moving frame 21 reciprocates, the connecting rod 22 will drive the blocking plate 23 to move in the horizontal direction. The reciprocating movement allows the blocking plate 23 to intermittently block the discharge of rice in the discharge pipe 5, so as to complete the intermittent discharge of rice in the discharge pipe 5. Compared with the continuous drop of rice into the processing box 1 through the discharge pipe 5, the intermittent discharge can prevent the screen 10 from receiving too much rice at one time, reducing the load of the screen 10 for screening rice, thereby further improving the screening effect of the screen 10 on rice, so as to better screen out impurities in the rice, ensuring that there are no impurities in the rice during the subsequent heavy metal detection operation, thereby improving the accuracy of the detection result.

[0031] Further, the auxiliary component includes a piston cylinder 8 fixedly mounted on the upper surface of the processing box 1, the surface of the piston cylinder 8 is fixedly connected with the air inlet pipe 7 and the connecting pipe 39, the surface of the air inlet pipe 7 is provided with a one-way valve 1, the surface of the connecting pipe 39 is provided with a one-way valve 2 40, the inner wall of the feed pipe 5 is fixedly mounted with an air outlet pipe 37, the surface of the air outlet pipe 37 is evenly provided with a plurality of air outlets 38, the end of the connecting pipe 39 is fixedly connected with the air outlet pipe 37, the inner wall of the piston cylinder 8 is slidably connected with a piston plate 41, the surface of the piston plate 41 is fixedly connected with a piston rod 30, and the end of the piston rod 30 extending out of the piston cylinder 8 is provided with a hinge block 31; The surface of the blocking plate 23 is fixedly connected with a connecting block 34, the end of the connecting block 34 is fixedly connected with a hinge block 4 33, and the hinge block 31 and the hinge block 4 33 are hingedly connected with a hinge plate 2 32; The surface of the feeding pipe 5 is fixedly connected to a collecting box 35 , the inner wall of the feeding pipe 5 is fixedly connected to a material guide block 42 , and the surface of the collecting box 35 is hinged with a door body 36 .

[0032] When the present embodiment is in use, before the rice sample is screened by the sieve 10, some rice husks that were not removed during sampling will be mixed in the rice sample. The mass of the rice husks is smaller than the mass of other impurities in the rice sample, but the volume is generally larger. In order to prevent the rice husks from adhering to the surface of the sieve 10 when the sieve 10 is screening the rice and being difficult to clean, it is necessary to remove them before the sieve 10 is used for screening the rice.

[0033] And as Figure 5 , Figure 6 and Figure 7 As shown, after the motor 19 is turned on, as the baffle plate 23 reciprocates, the hinge block 4 33 will move reciprocally synchronously. Similarly, under the hinged action of the hinge plate 2 32, the piston rod 30 will drive the piston plate 41 to perform piston movement in the piston cylinder 8. Since the flow direction of the one-way valve 1 on the surface of the intake pipe 7 is from the intake pipe 7 to the piston cylinder 8, and the flow direction of the one-way valve 2 40 on the surface of the connecting pipe 39 is from the piston cylinder 8 to the connecting pipe 39, the piston movement in the piston cylinder 8 will suck in the outside air from the intake pipe 7, pass through the connecting pipe 39, and spray it out from the multiple outlets 38 on the surface of the outlet pipe 37.

[0034] It is worth noting that after the motor 19 drives the rotating shaft 18 to rotate one circle, the piston cylinder 8 just completes a piston movement, and then the motor 19 stops rotating for a short period of time. During the time when the motor 19 is stagnant, the blocking plate 23 is just in a state of blocking the feeding pipe 5. At this time, the rice will fall on the upper surface of the feeding pipe 5, and the air inhaled from the piston movement in the piston cylinder 8 can also have sufficient time to be ejected through multiple air outlets 38 to the rice above the blocking plate 23. Due to the small mass of the rice husk, the gas ejected from the air outlet 38 Under the action of the filter 35 , the rice husk mixed in the rice can be blown into the collecting box 35 , so that the rice husk in the rice sample can be cleaned before the screening operation of the screen 10 , thereby avoiding the problem that the rice husk is attached to the surface of the screen 10 when the screen 10 screens the rice and is difficult to clean, which affects the normal screening of the rice sample by the screen 10 , and ensures the long-term use of the screen 10 , so that a large number of rice samples can be continuously screened, ensuring the accuracy of the subsequent rice heavy metal detection results while also improving the detection efficiency of heavy metals in rice.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for detecting heavy metals in rice, characterized in that: The detection method comprises the following steps: Intermittent unloading of sampled rice: the motor (19) drives the rotating shaft (18) to rotate, causing the moving frame (21) to reciprocate in the horizontal direction, and the connecting rod (22) drives the blocking plate (23) to intermittently block the rice in the unloading pipe (5), thereby completing the intermittent unloading of rice; Rice husk removal and rice screening before testing: As the rotating shaft (18) rotates, the cam (17) is driven to rotate synchronously, driving the screen (10) to move back and forth in the horizontal direction while shaking slightly in the vertical direction, simulating a worker shaking and shaking the screen (10) to screen out sand and gravel and granular metal in the rice sample. The screened rice sample without impurities will fall onto the guide plate (3) and be discharged from the discharge port (2) on the surface of the processing box (1) along the guide plate (3); Detection of heavy metal content in rice: The rice sample free of impurities discharged from the discharge port (2) is collected and ground, a reaction solvent is poured into the ground rice to mix, the mixed solvent is centrifuged, and then the mixture is placed in a detection instrument for heavy metal content detection; At this point, the heavy metal content testing of rice is completed.

2. A method for detecting heavy metals in rice according to claim 1, characterized in that: The rice husk removal and rice screening steps before detection also include: As the blocking plate (23) moves back and forth, the piston plate (41) moves in the piston cylinder (8) under the action of the hinge plate (32), so that the outside air is sucked in from the air inlet pipe (7) and ejected from the air outlet (38) on the surface of the air outlet pipe (37); After the motor (19) drives the rotating shaft (18) to rotate one circle, it stops rotating for a short period of time. At this time, the blocking plate (23) is in a state of blocking the feeding pipe (5). The air discharged from the piston cylinder (8) has sufficient time to be sprayed through the multiple air outlets (38) onto the rice above the blocking plate (23), and the rice husk mixed in the rice is blown into the collection box (35).

3. A method for detecting heavy metals in rice according to claim 2, characterized in that: The upper surface of the processing box (1) is fixedly connected to a feed pipe (5), the upper surface of the feed pipe (5) is fixedly connected to a feed hopper (6), and the lower surface of the feed pipe (5) is fixedly connected to a cover body (9); The inner wall of the processing box (1) is slidably connected to a screen frame (12), the inner wall of the screen frame (12) is fixedly connected to four symmetrically arranged triangular limit blocks (11), and the screen frame (12) is slidably connected to the screen (10) via the four triangular limit blocks (11); The processing box (1) is provided with a driving component, a material discharge component and an auxiliary component.

4. A method for detecting heavy metals in rice according to claim 3, characterized in that: The driving component is used to drive the screen (10) to move horizontally in the left and right directions while also moving up and down in a small amplitude; The feeding component is in driving connection with the driving component and is used to control the rice in the feeding pipe (5) to intermittently drop onto the screen (10); The auxiliary component is in driving connection with the feeding component and is used to clean the impurities mixed in the rice when the rice stays in the feeding pipe (5); The driving component comprises a support plate (16) fixedly connected to the inner wall of the processing box (1), a motor (19) is fixedly mounted on the surface of the support plate (16), an output shaft of the motor (19) is fixedly connected to a rotating shaft (18), a cam (17) is fixedly connected to the surface of the rotating shaft (18), a spring (43) is commonly provided between the screen (10) and the screen frame (12), and a telescopic rod is also commonly provided between the screen (10) and the screen frame (12); The driving component further comprises a rectangular notch (28) formed on the inner wall of the processing box (1), a moving block (27) being slidably connected to the inner wall of the rectangular notch (28), a hinge block 1 (26) being provided at the end of the moving block (27) extending out of the rectangular notch (28), a contact rod (29) being fixedly connected to the lower surface of the hinge block 1 (26), a hinge block 2 (24) being provided on the side of the screen (10), a hinge plate 1 (25) being hingedly connected between the hinge block 1 (26) and the hinge block 2 (24); The inner wall of the processing box (1) is fixedly connected to a fixed block (13), the upper surface of the fixed block (13) is fixedly connected to a limit rod (14), the limit rod (14) passes through the screen frame (12) and is slidably connected thereto, and a second spring (15) is provided between the screen frame (12) and the fixed block (13); The blanking component comprises a rotating plate (45) fixedly connected to the end of the rotating shaft (18), a moving column (20) being fixedly connected to the surface of the rotating plate (45), and a moving frame (21) being slidably connected to the outer surface of the moving column (20); The inner wall of the feeding tube (5) is slidably connected to a blocking plate (23), and one side of the blocking plate (23) extending out of the feeding tube (5) is fixedly connected to a connecting rod (22), and the end of the connecting rod (22) is fixedly connected to the moving frame (21).

5. A method for detecting heavy metals in rice according to claim 4, characterized in that: Two symmetrically arranged sliding blocks (44) are fixedly connected to the surface of the baffle plate (23), and the inner wall of the discharge pipe (5) is provided with a sliding groove for the sliding blocks (44) to slide and fit.

6. A method for detecting heavy metals in rice according to claim 5, characterized in that: The auxiliary component comprises a piston cylinder (8) fixedly mounted on the upper surface of the processing box (1); the surface of the piston cylinder (8) is fixedly connected to an air inlet pipe (7) and a connecting pipe (39); a one-way valve 1 is arranged on the surface of the air inlet pipe (7); a one-way valve 2 (40) is arranged on the surface of the connecting pipe (39); and an air outlet pipe (37) is fixedly mounted on the inner wall of the discharge pipe (5).

7. A method for detecting heavy metals in rice according to claim 6, characterized in that: A plurality of air outlets (38) are evenly arranged on the surface of the air outlet pipe (37), an end of the connecting pipe (39) is fixedly connected to the air outlet pipe (37), and a piston plate (41) is slidably connected to the inner wall of the piston cylinder (8).

8. A method for detecting heavy metals in rice according to claim 7, characterized in that: A piston rod (30) is fixedly connected to the surface of the piston plate (41), and a hinge block (31) is provided at the end of the piston rod (30) extending out of the piston cylinder (8); A connecting block (34) is fixedly connected to the surface of the blocking plate (23), an end of the connecting block (34) is fixedly connected to a hinge block four (33), and a hinge plate two (32) is hingedly connected between the hinge block three (31) and the hinge block four (33); The surface of the material discharge pipe (5) is fixedly connected to a collection box (35), the inner wall of the material discharge pipe (5) is fixedly connected to a material guide block (42), and the surface of the collection box (35) is hingedly connected to a door body (36).

9. A method for detecting heavy metals in rice according to claim 3, characterized in that: The outer surface of the processing box (1) is provided with a control panel (4), the surface of the processing box (1) is provided with a material outlet (2), and the inner wall of the processing box (1) is provided with a material guide plate (3).

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