Adjustable white rice grading screen and method of adjusting the same

Abstract

The application discloses a white rice grading screen and a regulating method thereof, and belongs to the field of white rice screening. The white rice grading screen comprises a rack, a moving frame slidingly arranged on the top of the rack, a screening mechanism arranged on the top of the rack, and a pore size regulating mechanism arranged at the bottom of a discharging end of the screening mechanism. The rectangular frame and the adjusting block are arranged, the adjusting block can be moved to the bottom of the screen hole to block the screen hole, the area of the blocked screen hole can be regulated by controlling the moving distance of the adjusting block, the pore size of the screen hole can be regulated, the screen mesh does not need to be disassembled as a whole when white rice of different sizes is screened, and the white rice grading screen is more convenient to use. The fixing mechanism is arranged, a plurality of rectangular frames can be simultaneously fixed, or the rectangular frames can be individually fixed, the pore sizes of the screen holes of multiple layers can be simultaneously regulated, or the screen holes of a single layer can be regulated.

Description

Technical Field

[0001] This invention relates to the field of white rice sieving technology, and in particular to an adjustable white rice grading sieve and its adjustment method. Background Technology

[0002] White rice is a type of rice that has been refined. The grains are smaller. During processing, white rice only undergoes milling and the removal of the bran layer. It is not polished, so its appearance is not as attractive as refined rice and it is easily mistaken for old rice or broken rice. The nutritional value of white rice is higher than that of other refined rice. It has a high starch content. In terms of taste and aroma, most people believe that white rice is superior to other refined rice such as brown rice and germ rice. Before packaging, white rice needs to be sieved to separate the mixed bran layer, resulting in whole white rice grains and broken rice.

[0003] Traditional sieving devices typically consist of a grading sieve and a vibrating mechanism. The vibrating mechanism causes the grading sieve to sway left and right, causing the rice bran layer to fall through the sieve's apertures while the white rice remains inside. However, when using this type of grading sieve, if different sizes of white rice need to be sieved and different aperture screens are required, the entire grading sieve must be disassembled and replaced with sieves of different apertures. Since this replacement is necessary every time sieving is performed, it is very time-consuming and labor-intensive. Therefore, we propose an adjustable white rice grading sieve and its adjustment method. Summary of the Invention

[0004] The purpose of this invention is to solve the problem in the prior art that when sieving white rice of different sizes requires the use of sieves with different aperture sizes, it is necessary to completely disassemble the grading sieve and replace it with a grading sieve of a different aperture size. Since it is necessary to replace it every time sieving, it is very time-consuming and labor-intensive. Therefore, this invention proposes an adjustable white rice grading sieve and its adjustment method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An adjustable white rice grading sieve includes a frame and a movable frame slidably disposed on top of the frame, and further includes:

[0007] A screening mechanism, wherein the screening mechanism is disposed on the top of the frame;

[0008] An aperture adjustment mechanism is provided at the bottom of the discharge end of the screening mechanism to control the size of the discharge end area of ​​the screening mechanism, and the aperture adjustment mechanism is provided with an insertion port connected to the outside.

[0009] A fixing mechanism is provided on the left side of the movable frame. The fixing mechanism is provided with an insertion end. When the insertion end is engaged with the insertion port provided on the aperture adjustment mechanism, the movable frame can be fixed to the aperture adjustment mechanism.

[0010] A limiting mechanism is arranged on the top of the moving frame, and is used to limit the fixing mechanism when the aperture adjusting mechanism moves to the bottom of the discharge end of the screening mechanism.

[0011] A driving part is arranged on the top of the frame, and the moving frame is connected to the output end of the driving part.

[0012] Preferably, the screening mechanism comprises a screen mesh, which is equidistantly connected to the top of the frame, and the top of the screen mesh is provided with screen holes.

[0013] Preferably, the aperture adjusting mechanism comprises a fixing frame, which is mounted on the right side of the top of the frame, the inner wall of the fixing frame is connected with a connecting block, one side of the connecting block is connected with a U-shaped support rod, the outer surface of the U-shaped support rod is slidably provided with sliding blocks, the sliding blocks are connected with a rectangular frame, the rectangular frame is provided with an adjusting block, the adjusting block is tightly attached to the bottom of the screen mesh, the top of one of the sliding blocks is connected with a groove block, and the groove block is provided with a rectangular groove.

[0014] Preferably, the fixing mechanism comprises a limiting groove, which is arranged on the left side of the moving frame, a connecting strip is slidably arranged in the limiting groove, one end of the connecting strip is connected with a pressing block, the bottom of the pressing block is connected with a fixing strip, the fixing strip is insertable into the rectangular groove, the top wall of the moving frame is threadedly connected with a threaded rod, the bottom end of the threaded rod is rotatably connected with the pressing block through a bearing, the top end of the threaded rod is connected with a knob, and the outer surface of the knob is provided with a limiting tooth.

[0015] Preferably, the limiting mechanism comprises a mounting box, which is arranged on the top of the moving frame, a lead screw is rotatably arranged in the mounting box, the outer surface of the lead screw is threadedly provided with a moving block, the moving block is slidably arranged in a sliding rail arranged on the top of the mounting box, the top end of the moving block is connected with an L-shaped strip, one end of the L-shaped strip away from the moving block is connected with a fixing plate, one side of the fixing plate is provided with a rubber strip, one side of the rubber strip is connected with a limiting strip, the limiting strip is engaged with the limiting tooth, the right end of the lead screw is connected with a knob, the top of the frame is provided with a limiting mechanism, and the outer surface of the engaging mechanism is engaged with the limiting mechanism.

[0016] Preferably, the diameter of the adjusting block is greater than the diameter of the screen hole.

[0017] Preferably, the corners of the frame are provided with mounting holes for screwing.

[0018] Preferably, the interior of the sliding block is provided with an elastic member, which is tightly attached to the U-shaped support rod.

[0019] Preferably, the length of the fixing strip gradually decreases from top to bottom.

[0020] An adjustable white rice grading screen adjusting method, comprising the following steps:

[0021] Step A: Install the frame on the vibration mechanism, when the aperture of the screen hole needs to be adjusted, turn the knob, the knob drives the threaded rod to rotate, the connecting strip is limited through the limiting groove, thereby driving the lower pressing block and the fixed strip to move downward, the fixed strip is inserted into the rectangular groove, the groove block is preliminarily connected with the moving frame, at this time, the position of the limiting teeth needs to be the same as that of the fixed plate;

[0022] Step B: Start the driving part to drive the moving frame to move towards the screen, since the groove block has been connected with the moving frame, the groove block moves together, the rectangular frame, the sliding block and the adjusting block follow the outer surface of the U-shaped support rod to move to the bottom of the screen, the adjusting block is used to block the screen hole, the aperture of the screen hole is changed by controlling the moving distance of the adjusting block;

[0023] Step C: When the driving part drives the adjusting block to move to the bottom of the screen hole, since the meshing connection can drive the rotation, the screw rod is driven to rotate, thereby driving the moving block and the L-shaped strip to move towards the limiting teeth, the fixed plate and the limiting strip follow to move, the limiting strip is engaged with the limiting teeth, the knob is limited, the white rice is placed in the uppermost screen, and the vibration mechanism is started to make the frame and the screen shake left and right, through the shaking, the bran layer and the smaller rice grains fall from the screen hole to the second layer screen, and the grading screening is sequentially performed.

[0024] Compared with the prior art, the adjustable white rice grading screen and the adjusting method thereof have the following beneficial effects:

[0025] 1. The adjustable white rice grading screen, by setting the rectangular frame and the adjusting block, the adjusting block can move to the bottom of the screen hole to block the screen hole, the area of the blocked screen hole can be adjusted by controlling the moving distance of the adjusting block, the aperture of the screen hole can be adjusted, when the white rice of different sizes is screened, the screen does not need to be disassembled as a whole, and the use is more convenient, through the setting of the fixing mechanism, multiple rectangular frames can be fixed at the same time, or a rectangular frame can be fixed alone, so that the apertures of multiple screen holes can be adjusted at the same time, or a single layer can be adjusted.

[0026] 2. The adjustable white rice grading screen, by setting the limiting mechanism, the driving force generated by the driving part can limit the fixing mechanism, avoid the rotation of the knob and the threaded rod under the action of the vibration mechanism, make the fixed strip separate from the rectangular groove, thereby making the rectangular frame and the adjusting block deviate, making the area of the blocked screen hole deviate, and making the aperture of the screen hole adjust chaotic, and the driving power of the limiting mechanism is the driving part, so that the driving part not only can drive the moving frame to move, but also can limit the fixing mechanism, and the linkage is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A structure front view angle diagram of an adjustable white rice grading screen according to the present application;

[0028] Figure 2 A structure side view angle diagram of an adjustable white rice grading screen according to the present application;

[0029] Figure 3 A structure connection relationship diagram of a screening mechanism and an aperture adjusting mechanism of an adjustable white rice grading screen according to the present application;

[0030] Figure 4 A rectangular frame structure diagram of an adjustable white rice grading screen according to the present application;

[0031] Figure 5 A fixed mechanism structure diagram of an adjustable white rice grading screen according to the present application;

[0032] Figure 6 A moving frame structure side view angle diagram of an adjustable white rice grading screen according to the present application;

[0033] Figure 7 A fixed plate structure diagram of an adjustable white rice grading screen according to the present application.

[0034] In the drawings: 1, frame; 2, moving frame;

[0035] 3, screening mechanism; 301, screen mesh; 302, screen hole;

[0036] 4, aperture adjusting mechanism; 401, fixed frame; 402, connecting block; 403, U-shaped support rod; 404, sliding block; 405, rectangular frame; 406, adjusting block; 407, groove block; 408, rectangular groove;

[0037] 5, fixed mechanism; 501, limiting groove; 502, connecting strip; 503, pressing block; 504, fixed strip; 505, threaded rod; 506, knob; 507, limiting tooth;

[0038] 6, limiting mechanism; 601, mounting box; 602, screw rod; 603, moving block; 604, L-shaped strip; 605, fixed plate; 606, rubber strip; 607, limiting strip; 608, connecting gear; 609, rectangular rack;

[0039] 7, driving part; 8, mounting hole; 9, elastic member. DETAILED DESCRIPTION

[0040] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application.

[0041] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0042] Referring to Figures 1-7 An adjustable white rice grading screen, comprising a rack 1 and a moving frame 2 slidingly arranged on the top of the rack 1, further comprising:

[0043] A screening mechanism 3 arranged on the top of the rack 1;

[0044] A pore size adjusting mechanism 4 arranged at the bottom of the discharge end of the screening mechanism 3, for controlling the size of the area of the discharge end of the screening mechanism 3, and the pore size adjusting mechanism 4 is provided with an insertion port connected to the outside;

[0045] A fixing mechanism 5 arranged on the left side of the moving frame 2, the fixing mechanism 5 is provided with an insertion end, when the insertion end is clamped into the insertion port arranged on the pore size adjusting mechanism 4, the moving frame 2 and the pore size adjusting mechanism 4 can be fixed;

[0046] A limiting mechanism 6 arranged on the top of the moving frame 2, for limiting the fixing mechanism 5 when the pore size adjusting mechanism 4 moves to the bottom of the discharge end of the screening mechanism 3;

[0047] A driving part 7 arranged on the top of the rack 1, and the moving frame 2 is connected to the output end of the driving part 7.

[0048] The screening mechanism 3 comprises a screen mesh 301, the screen mesh 301 is connected equidistantly on the top of the rack 1, and the top of the screen mesh 301 is provided with a screen hole 302.

[0049] The aperture adjusting mechanism 4 comprises a fixed frame 401 installed on the right side of the top of the rack 1, the inner wall of the fixed frame 401 is connected with a connecting block 402, one side of the connecting block 402 is connected with a U-shaped support rod 403, the outer surface of the U-shaped support rod 403 is slidably connected with sliding blocks 404, the sliding blocks 404 are connected with a rectangular frame 405, the rectangular frame 405 is provided with an adjusting block 406, the adjusting block 406 is tightly attached to the bottom of the screen 301, the top of one of the sliding blocks 404 is connected with a groove block 407, and the groove block 407 is provided with a rectangular groove 408.

[0050] The rack 1 is provided with mounting holes 8 for screwing.

[0051] The inside of the sliding block 404 is provided with an elastic element 9 which is tightly attached to the U-shaped support rod 403.

[0052] Specifically, by inserting the screw into the mounting hole 8, the rack 1 can be installed on the external vibration mechanism, the adjusting block 406 can block the screen hole 302 by being attached to the bottom of the screen 301, the sliding block 404 can slide on the outer surface of the U-shaped support rod 403, the distance between the rectangular frame 405 and the adjusting block 406 moving to the bottom of the screen 301 can be controlled, and the area of the adjusting block 406 blocking the screen hole 302 can be controlled, so that the size of the screen hole 302 can be adjusted. When different sizes of white rice need to be screened, the screening mechanism 3 does not need to be disassembled as a whole, but only needs to adjust the area of the adjusting block 406 blocking the screen hole 302, which is very convenient.

[0053] It should be noted that the fixed frame 401 is fixed on the top of the rack 1, so that the U-shaped support rod 403 can support the rectangular frame 405, the elastic element 9 is arranged in the perforation in the middle of the sliding block 404, and the elasticity of the elastic element 9 can enhance the friction between the sliding block 404 and the U-shaped support rod 403, so that the rectangular frame 405 will not slide under the action of external force when the vibration mechanism is started. The elastic element 9 can be one of a rubber ring and a silica gel ring. When the aperture of each layer of screen hole 302 is adjusted separately, the lower two rectangular frames 405 will not move due to the force of the vibration mechanism, thereby avoiding confusion in the aperture adjustment of multiple screen holes 302.

[0054] Reference Figures 1-7The fixing mechanism 5 comprises a limiting groove 501 arranged on the left side of the moving frame 2, a connecting strip 502 slidingly arranged in the limiting groove 501, a lower pressing block 503 connected to one end of the connecting strip 502, a fixing strip 504 connected to the bottom of the lower pressing block 503, the fixing strip 504 being insertable into the rectangular groove 408, a threaded rod 505 threadedly connected to the top wall of the moving frame 2 and rotationally connected to the lower pressing block 503 through a bearing at the bottom end of the threaded rod 505, and a knob 506 connected to the top end of the threaded rod 505, the outer surface of the knob 506 being provided with a limiting tooth 507.

[0055] The diameter of the adjusting block 406 is greater than the diameter of the sieve hole 302.

[0056] The length of the fixing strip 504 decreases from top to bottom.

[0057] Specifically, the threaded rod 505 is rotated to drive the lower pressing block 503 and the fixing strip 504 to move downward, so that the fixing strip 504 is sequentially inserted into the corresponding rectangular groove 408, thereby fixing the moving frame 2 and the groove block 407, and after being connected, the three rectangular frames 405 can be simultaneously moved to the bottom of the sieve net 301 to simultaneously adjust the aperture, and the driving part 7 can be a cylinder for driving the moving frame 2 to move.

[0058] It should be noted that in actual application scenarios, there may be a phenomenon that multiple sieve holes 302 do not need to be simultaneously adjusted, and therefore when the apertures of each layer of sieve nets 301 need to be individually adjusted, the threaded rod 505 is rotated to sequentially insert the fixing strip 504 into the corresponding rectangular groove 408, and since the length of the fixing strip 504 decreases from top to bottom, when the uppermost fixing strip 504 is inserted into the uppermost rectangular groove 408, the two fixing strips 504 below will not be inserted, and when the uppermost fixing strip 504 is inserted to a certain position, the middle fixing strip 504 will be preliminarily inserted into the second rectangular groove 408, and so on, so that one or more rectangular frames 405 can be individually driven to move, thereby achieving the effect of individually adjusting the apertures of each layer of sieve holes 302.

[0059] Reference Figures 1-7The limiting mechanism 6 comprises a mounting box 601 arranged on the top of the moving frame 2, a screw rod 602 is rotatably arranged in the mounting box 601, a moving block 603 is threadedly arranged on the outer surface of the screw rod 602, the moving block 603 is slidably arranged in a slide rail arranged on the top of the mounting box 601, an L-shaped strip 604 is connected to the top end of the moving block 603, a fixed plate 605 is connected to the end of the L-shaped strip 604 away from the moving block 603, a rubber strip 606 is arranged on one side of the fixed plate 605, a limiting strip 607 is connected to one side of the rubber strip 606 and is engaged with the limiting tooth 507, a connecting gear 608 is connected to the right end of the screw rod 602, and a rectangular rack 609 is arranged on the top of the rack 1, and the connecting gear 608 is engaged with the outer surface of the rectangular rack 609.

[0060] Specifically, when the driving part 7 drives the moving frame 2 and the rectangular frame 405 to move, the connecting gear 608 is driven to rotate, the screw rod 602 is driven to rotate, the moving block 603 and the fixed plate 605 are moved to the position engaged with the limiting tooth 507, the limiting strip 607 limits the knob 506 and the limiting tooth 507, the knob 506 and the threaded rod 505 are prevented from rotating automatically under the action of the vibration mechanism, the fixed strip 504 is separated from the rectangular groove 408, the rectangular frame 405 and the adjusting block 406 are deviated, the area of the screen hole 302 is deviated, and the diameter of the screen hole 302 is adjusted.

[0061] It should be noted that, in actual application, when the area of the screen hole 302 blocked by the adjusting block 406 is large, the limiting strip 607 is in contact with the limiting tooth 507, and the knob 506 is limited, and when the area of the screen hole 302 blocked by the adjusting block 406 is small, the limiting strip 607 can continue to move a distance in the direction of the limiting tooth 507, so that the movement of the moving frame 2 is not affected, thereby limiting the effect, and the driving power source of the limiting mechanism 6 is the driving part 7, so that the driving part 7 can not only drive the moving frame 2 to move, but also limit the fixed mechanism 5, thereby enhancing the linkage, and when the fixed strip 504 fixes the groove block 407, one of the limiting teeth 507 faces the limiting strip 607, so that the limiting strip 607 can limit the knob 506.

[0062] Working principle: insert the screw into the installation hole 8, install the rack 1 on the external vibration mechanism, when the aperture of the screen hole 302 needs to be adjusted, turn the knob 506, the knob 506 drives the threaded rod 505 to rotate, the connecting strip 502 is limited through the limiting groove 501, thereby driving the lower pressing block 503 and the fixed strip 504 to move downwards, the fixed strip 504 is inserted into the rectangular groove 408, the groove block 407 is preliminarily connected with the moving frame 2, at this time, the position of the limiting teeth 507 needs to be the same as that of the fixed plate 605, start the driving part 7, drive the moving frame 2 to move towards the screen 301, since the groove block 407 is connected with the moving frame 2, drive the groove block 407 to move together, the rectangular frame 405, the sliding block 404 and the adjusting block 406 move together to the bottom of the screen 301 on the outer surface of the U-shaped support rod 403, the adjusting block 406 is blocked to the screen hole 302, the aperture of the screen hole 302 is changed by controlling the moving distance of the adjusting block 406, when the driving part 7 drives the adjusting block 406 to move to the bottom of the screen hole 302, since the connecting gear 608 is connected with the rectangular gear rack 609, the connecting gear 608 can be driven to rotate, the connecting gear 608 drives the lead screw 602 to rotate, thereby driving the moving block 603 and the L-shaped strip 604 to move towards the limiting teeth 507, the fixed plate 605 moves together with the limiting strip 607, the limiting strip 607 is engaged with the limiting teeth 507, the knob 506 is limited, the white rice is placed in the uppermost screen 301, and the vibration mechanism is started, the rack 1 and the screen 301 are shaken left and right, through the shaking, the bran layer and the smaller rice grains fall from the screen hole 302 to the second layer screen 301, and the classification screening is sequentially carried out.

[0063] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent substitutions or changes to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An adjustable white rice grading sieve, comprising a frame (1) and a moving frame (2) slidingly arranged on the top of the frame (1), characterized in that, Also include: Screening mechanism (3), the screening mechanism (3) is provided at the top of the rack (1); Aperture adjustment mechanism (4), the aperture adjustment mechanism (4) is provided at the bottom of the discharge end of the screening mechanism (3), for controlling the size of the discharge end area of the screening mechanism (3), and the aperture adjustment mechanism (4) is provided with an insertion port connected with the outside; The fixing mechanism (5) is provided on the left side of the moving frame (2), and the insertion end is provided on the fixing mechanism (5). When the insertion end is clamped into the insertion port provided on the aperture adjustment mechanism (4), the moving frame (2) and the aperture adjustment mechanism (4) can be fixed; The limiting mechanism (6) is provided on the top of the moving frame (2), and the aperture adjustment mechanism (4) is moved to the bottom of the discharge end of the screening mechanism (3). The limiting mechanism (6) is used for limiting the fixing mechanism (5); The driving part (7) is provided on the top of the rack (1), and the moving frame (2) is connected to the output end of the driving part (7); The screening mechanism (3) comprises a screen (301), and the screen (301) is connected equidistantly on the top of the rack (1). The top of the screen (301) is provided with a sieve hole (302); The aperture adjustment mechanism (4) comprises a fixed frame (401), and the fixed frame (401) is installed on the right side of the top of the rack (1). The inner wall of the fixed frame (401) is connected with a connecting block (402). One side of the connecting block (402) is connected with a U-shaped support rod (403). The outer surface of the U-shaped support rod (403) is slidably provided with a sliding block (404). The sliding blocks (404) are connected with a rectangular frame (405). The rectangular frame (405) is provided with an adjusting block (406) inside. The adjusting block (406) is tightly attached to the bottom of the screen (301). The top of one of the sliding blocks (404) is connected with a groove block (407), and the groove block (407) is provided with a rectangular groove (408) inside. When different sizes of white rice need to be screened, the whole screening mechanism (3) does not need to be disassembled for screening. Only the area of the sieve hole (302) blocked by the adjusting block (406) needs to be adjusted. The fixing mechanism (5) comprises a limiting groove (501) provided on the left side of the moving frame (2). The limiting groove (501) is slidably provided with a connecting strip (502). One end of the connecting strip (502) is connected with a pressing block (503). The bottom of the pressing block (503) is connected with a fixing strip (504). The fixing strip (504) can be inserted into the rectangular groove (408). The top wall of the moving frame (2) is threadedly connected with a threaded rod (505), and the bottom end of the threaded rod (505) is rotatably connected with the pressing block (503) through a bearing. The top end of the threaded rod (505) is connected with a knob (506). The outer surface of the knob (506) is provided with a limiting tooth (507). The limiting mechanism (6) comprises a mounting box (601) provided on the top of the moving frame (2), a screw rod (602) rotating in the mounting box (601), a moving block (603) threadedly mounted on the outer surface of the screw rod (602), the moving block (603) sliding in a sliding rail provided on the top of the mounting box (601), an L-shaped strip (604) connected to the top end of the moving block (603), a fixed plate (605) connected to the end of the L-shaped strip (604) away from the moving block (603), a rubber strip (606) provided on one side of the fixed plate (605), a limiting strip (607) connected to one side of the rubber strip (606) and engaged with the limiting teeth (507), a connecting gear (608) connected to the right end of the screw rod (602), and a rectangular rack (609) provided on the top of the rack (1), wherein the connecting gear (608) is engaged with the outer surface of the rectangular rack (609).

2. The adjustable white rice grading sieve according to claim 1, wherein, The diameter of the adjusting block (406) is greater than the diameter of the screen hole (302).

3. The adjustable white rice grading sieve according to claim 1, wherein, The rack (1) is provided with mounting holes (8) for screwing at the corners.

4. The adjustable white rice grading sieve of claim 1, wherein, The inner part of the sliding block (404) is provided with an elastic member (9) closely adhering to the U-shaped supporting rod (403).

5. The adjustable white rice grading sieve of claim 1, wherein, The length of the fixed strip (504) decreases from top to bottom.

6. The method of claim 1, wherein the method further comprises adjusting the adjustable white rice grading screen. The method comprises the following steps: Step A: install the rack (1) on a vibration mechanism, when the aperture of the screen hole (302) needs to be adjusted, turn the knob (506), the knob (506) drives the threaded rod (505) to rotate, the connecting strip (502) is limited through the limiting groove (501), thereby driving the lower pressing block (503) and the fixed strip (504) to move downwards, the fixed strip (504) is inserted into the rectangular groove (408), the groove block (407) is preliminarily connected with the moving frame (2), at this time, the position of the limiting teeth (507) needs to be the same as that of the fixed plate (605); Step B: start the driving part (7) to drive the moving frame (2) to move towards the screen (301), since the groove block (407) has been connected with the moving frame (2), the groove block (407) is driven to move, the rectangular frame (405), the sliding block (404) and the adjusting block (406) are moved together on the outer surface of the U-shaped supporting rod (403) to the bottom of the screen (301), the adjusting block (406) is used to block the screen hole (302), the aperture of the screen hole (302) is changed by controlling the moving distance of the adjusting block (406). Step C: when the driving part (7) drives the adjusting block (406) to move to the bottom of the sieve hole (302), since the connecting gear (608) is engaged with the rectangular rack (609), the connecting gear (608) can be driven to rotate, the connecting gear (608) drives the lead screw (602) to rotate, thereby driving the moving block (603) and the L-shaped strip (604) to move in the direction of the limiting teeth (507), so that the fixed plate (605) and the limiting strip (607) move together, the limiting strip (607) is engaged with the limiting teeth (507), the knob (506) is limited, the white rice is placed in the uppermost sieve (301), and the vibration mechanism is started, so that the rack (1) and the sieve (301) shake left and right, through the shaking, the rice bran layer and the smaller rice grains fall from the sieve hole (302) to the second layer sieve (301), and the classification screening is sequentially carried out.

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