Classified screening equipment and classified screening process for rice processing

Abstract

The invention relates to the technical field of screening equipment, and discloses classified screening equipment and a classified screening technology for rice processing, the classified screening equipment comprises a screening machine base and a screening frame installed on the screening machine base, a feeding port is formed in the top of the screening frame, and a stand column is further fixed to the screening machine base. Through the arrangement of the transfer bin, the conveyor, the baffle, the push plate, the movable door and the driving assembly, when rice is conveyed into the screen frame through the conveyor, the baffle blocks caked rice, normal rice is discharged through a gap between the baffle and the conveyor, then the driving assembly drives the push plate and the movable door to move, and the rice is conveyed into the screen frame. The detained caked metamorphic rice is discharged from the conveyor in time, gaps are prevented from being blocked by the caked metamorphic rice, in this way, the caked metamorphic rice can be treated in advance before the rice is screened, the situation that the caked rice is smashed after being vibrated in the screen frame and then mixed into normal rice is avoided, and the quality of the screened rice is improved.

Description

Technical Field

[0001] The invention relates to the technical field of screening equipment, in particular to a grading screening equipment and a grading screening process for rice processing. Background Art

[0002] During the production and processing of rice, rice needs to be screened according to its particle size, which can not only control the size of rice to be consistent, but also remove some impurities such as sand, gravel, and rice husks. At present, a circular rotary vibrating screen is often used for screening small batches of rice. Its principle is mainly to use an upright motor as an excitation source to convert the motor's rotational motion into horizontal, vertical, and inclined three-dimensional motion, and then transmit this motion to the screen surface. However, there are still certain deficiencies in practical applications. Rice is prone to caking during storage. The reasons for caking include moisture or raw rice. The properties of rice after caking have changed and it has deteriorated and cannot be eaten. However, when the current vibration equipment is used to screen rice, the agglomerated deteriorated rice is easily broken into individual rice grains under the action of vibration, so that the deteriorated rice is mixed with the undeteriorated rice, which reduces the quality of the rice. At present, there is a lack of effective screening methods for such agglomerated rice. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a grading and screening device and a grading and screening process for rice processing, which have the advantages of improving the rice screening quality and solves the problem that the current rice screening equipment easily vibrates and crushes the agglomerated rice, resulting in the deteriorated rice grains being mixed into the non-deteriorated rice grains.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a grading screening device, comprising a screening machine base and a screen frame installed on the screening machine base, wherein a feed port is arranged on the top of the screen frame, and a column is fixed on the screening machine base, wherein the column is located on one side of the screen frame, and a transfer silo and a conveyor are fixedly installed on the column near the side of the screen frame, wherein a discharge port and a gate valve assembly are arranged at the bottom of the transfer silo, wherein the transfer silo is used to store rice and discharge rice onto the conveyor, and wherein the gate valve assembly is used to control the switch of the discharge port; One end of the conveyor extends above the feed inlet, and the conveyor is used to receive the rice and convey it into the feed inlet. A baffle is installed at one end of the conveyor near the feed inlet, and a gap is provided between the bottom of the baffle and the conveyor to allow normal rice to pass through, and the baffle is used to block agglomerated rice; Side guard plates are installed on both sides of the conveyor, and push plates and movable doors are installed on the ends of the two side guard plates close to the baffles respectively. A driving assembly is installed between the two side guard plates, and the driving assembly is used to drive the push plate to move and drive the movable door to rotate; The transfer silo intermittently discharges rice onto the conveyor through the discharge port, wherein normal rice passes through the gap at the bottom of the baffle plate and is discharged into the feed port through the end of the conveyor, while agglomerated rice is blocked by the baffle plate. When the normal rice on the conveyor is discharged, the drive assembly operates, forcing the movable door to rotate, and also drives the push plate to move toward the movable door, which pushes the agglomerated rice, causing it to pass through the opened movable door and detach from the conveyor.

[0005] Preferably, two symmetrical angle irons are fixed on one side of the transfer silo, and the two angle irons are fixed on the columns. The conveyor is arranged horizontally, and inclined rods are fixed on both sides of the conveyor, and one end of the inclined rods is fixedly connected to the columns. The discharge port extends to the top of the conveyor, and the two side guard plates are arranged as vertically arranged rectangular plates, one of which is provided with a through groove near one end of the baffle, and the movable door is installed in the through groove, and the push plate is arranged on the top of the conveyor and opposite to the movable door. An end guard plate is also provided at the end of the conveyor away from the baffle, and the edges on both sides of the end guard plate are respectively fixed to the two side guard plates.

[0006] Preferably, two base blocks are fixed to the outer wall of the movable door, a base shaft is fixedly connected between the two base blocks, a worm gear is fixedly connected to the middle of the base shaft, and two mounting seats are fixed to the outer wall of the side protection plate with a through groove, and both ends of the base shaft are rotatably connected to the two mounting seats respectively.

[0007] Preferably, the driving assembly includes a main motor, a transverse guide rod and a transverse screw, the main motor is fixed to the outer wall of one of the side protective plates, the transverse screw is located between the two side protective plates and both ends are rotatably connected to the two side protective plates, one end of the transverse screw is fixed to the output shaft of the main motor, the transverse guide rod is distributed parallel to the transverse screw, and both ends of the transverse guide rod are respectively fixed to the two side protective plates, a transverse nut sleeve is threadedly connected to the transverse screw, and the transverse nut sleeve is also movably connected to the transverse guide rod, and the push plate is fixed to the bottom of the transverse nut sleeve.

[0008] Preferably, one end of the guide rod passes through the outside of the side guard plate and is fixed with an end block, and the end of the transverse screw away from the main motor is fixed with a worm, the end of the worm is rotatably connected to the end block, and the worm is meshed with the worm wheel.

[0009] Preferably, the gate valve assembly includes two brackets, both of which are located at the top of the conveyor, and both ends of the brackets are fixedly connected to the two side protective plates respectively. A longitudinal guide rod and a longitudinal screw are provided between the two brackets, and the longitudinal screw is threadedly connected to the two brackets. The longitudinal guide rod is parallel to the longitudinal screw, and both ends of the longitudinal guide rod are fixed to the two brackets respectively. A longitudinal nut sleeve is threadedly connected to the longitudinal screw, and the longitudinal nut sleeve is also movably connected to the longitudinal guide rod. A gate plate is fixedly connected to the bottom of the longitudinal nut sleeve, and the gate plate is movably inserted into the discharge port.

[0010] Preferably, one end of the longitudinal screw is fixedly connected to a transmission gear, and the top of the transverse nut sleeve is fixedly connected to a transmission rack, and the transmission rack matches the transmission gear in position.

[0011] Preferably, a gantry is provided at one end of the conveyor close to the feed port, and both ends of the gantry are respectively fixed to both sides of the conveyor, the baffle is located inside the gantry and vertically slidably connected to the gantry, a vertical bolt is threadedly connected to the top of the gantry, and the bottom end of the vertical bolt is rotatably connected to the top of the baffle.

[0012] Preferably, an air pump is fixedly connected to the side wall of the transfer silo, an exhaust pipe is fixed to the exhaust end of the air pump, an intake pipe is fixed to the intake end of the air pump, a first branch pipe and a second branch pipe are fixed to the intake pipe, the first branch pipe extends to just above the feed port and is fixed with a first dust hood, the end of the second branch pipe is fixedly connected to an annular pipe, the annular pipe is fixedly sleeved on the bottom of the transfer silo, a plurality of third branches are fixed to the annular pipe, the end of the third branch pipe faces the discharge port and is fixed with a second dust hood.

[0013] The invention also discloses a rice processing grading and screening process, and the rice processing grading and screening process uses the grading and screening equipment mentioned above.

[0014] Compared with the prior art, the present invention provides a grading and screening device and a grading and screening process for rice processing, which has the following beneficial effects: 1. The grading and screening equipment and the grading and screening process for rice processing are provided with a transfer silo, a conveyor, a baffle, a push plate, a movable door and a driving component. When the rice is transmitted to the screen frame through the conveyor, the baffle blocks the agglomerated rice, and the normal rice is discharged through the gap between the baffle and the conveyor. Then, the push plate and the movable door are driven by the driving component to move, and the retained agglomerated and deteriorated rice is discharged from the conveyor in time to avoid clogging the gap. In this way, the agglomerated and deteriorated rice can be pre-processed before the rice is screened, and the agglomerated rice can be prevented from being crushed after vibration in the screen frame and then mixed into the normal rice, thereby improving the quality of the rice after screening.

[0015] 2. This grading and screening equipment and the grading and screening process for rice processing can adjust the height of the baffle by rotating the vertical bolt, and then adjust the height of the gap at the bottom of the baffle to adapt to rice grains of different specifications. At the same time, when conveying rice without the risk of agglomeration, the baffle can be directly adjusted to a higher position so that it no longer blocks the rice, and has a wide range of usage scenarios.

[0016] 3. This grading and screening equipment and the grading and screening process for rice processing can collect dust above the feed port and below the discharge port at the same time by arranging an air pump, various pipelines and a dust collecting hood, thereby avoiding dust pollution to the environment and being more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of a grading and screening device of the present invention Figure 1 ; Figure 2 A schematic diagram of the three-dimensional structure of a grading and screening device of the present invention Figure 2 ; Figure 3 It is a structural schematic diagram of the conveyor of the present invention; Figure 4 It is a working schematic diagram of the driving assembly of the present invention; Figure 5 For the present invention Figure 4 A magnified view of part A; Figure 6 It is a working schematic diagram of the gate valve assembly of the present invention; Figure 7 For the present invention Figure 6 A magnified view of part B; Figure 8 It is a schematic structural diagram of the air intake pipe of the present invention.

[0018] In the figure: 1, screening machine base; 2, screen frame; 21, feed port; 3, column; 4, transfer silo; 41, discharge port; 42, angle iron; 5, conveyor; 51, side protection plate; 511, mounting seat; 52, push plate; 53, movable door; 531, base block; 532, base shaft; 533, worm gear; 54, inclined rod; 55, through groove; 56, end protection plate; 6, gate valve assembly; 61, bracket; 62, longitudinal guide rod; 63, longitudinal screw; 64, longitudinal nut sleeve ; 65. gate; 66. transmission gear; 67. transmission rack; 7. baffle; 8. drive assembly; 81. main motor; 82. horizontal guide rod; 83. horizontal screw; 84. horizontal nut sleeve; 85. end block; 86. worm; 9. door frame; 10. vertical bolt; 11. air pump; 12. exhaust pipe; 13. intake pipe; 14. first branch pipe; 15. second branch pipe; 16. first dust hood; 17. annular pipe; 18. third branch pipe; 19. second dust hood. 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] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present application proposes a grading and screening device and a grading and screening process for rice processing.

[0021] Example 1: Please refer to Figure 1-Figure 3 A grading screening device comprises a screening machine base 1 and a screen frame 2 mounted on the screening machine base 1, a feed port 21 is arranged on the top of the screen frame 2, a column 3 is fixed on the screening machine base 1, the column 3 is located on one side of the screen frame 2, a transfer silo 4 and a conveyor 5 are fixedly mounted on the column 3 close to the side of the screen frame 2, a discharge port 41 and a gate valve assembly 6 are arranged at the bottom of the transfer silo 4, the transfer silo 4 is used to store rice and discharge rice onto the conveyor 5, and the gate valve assembly 6 is used to control the switch of the discharge port 41; One end of the conveyor 5 extends above the feed port 21. The conveyor 5 is used to receive the rice and convey it to the feed port 21. A baffle 7 is installed at one end of the conveyor 5 close to the feed port 21. A gap is provided between the bottom of the baffle 7 and the conveyor 5 to allow normal rice to pass through. The baffle 7 is used to block agglomerated rice. Side guard plates 51 are installed on both sides of the conveyor 5. Push plates 52 and movable doors 53 are installed at one end of the two side guard plates 51 close to the baffle 7. A driving assembly 8 is installed between the two side guard plates 51. The driving assembly 8 is used to drive the push plate 52 to move and the movable door 53 to rotate. The transfer silo 4 intermittently discharges rice onto the conveyor 5 through the discharge port 41, wherein normal rice passes through the gap at the bottom of the baffle 7 and is discharged into the feed port 21 through the end of the conveyor 5, and the agglomerated rice is blocked by the baffle 7. When the normal rice on the conveyor 5 is discharged, the drive assembly 8 operates to force the movable door 53 to rotate, and also drives the push plate 52 to move toward the movable door 53, and the push plate 52 pushes the agglomerated rice to pass through the opened movable door 53 and separate from the conveyor 5.

[0022] The screen frame 2 is at least provided with two layers, the feed port 21 is provided above the topmost screen frame 2, the base is fixed when the screening machine is in operation, only the screen frame 2 vibrates, the conveyor 5 is provided with a belt type, the baffle 7 is provided with a vertically provided square plate, the clearance height between the baffle 7 and the conveyor 5 matches the height of a single normal rice, so that both normal rice and broken rice can pass through, and only agglomerated rice cannot pass through, the side guard plate 51 is used to block the rice on the conveyor 5 to prevent it from overflowing along the edge of the conveyor 5, in the initial state, the push plate 52 is close to the inner side of one side guard plate 51, and the movable door 53 is installed on the other side guard plate 51 and is in a closed state; When in use, rice is put into the transfer silo 4 in advance, and then the rice is intermittently discharged to the conveyor 5 through the discharge port 41 at the bottom of the transfer silo 4. At the same time, the conveyor 5 continues to operate, so that the rice is evenly laid on the conveyor 5. The conveyor 5 also continuously transports the rice to the feed port 21 during operation. After normal rice passes through the gap, it falls from the end of the conveyor 5 into the feed port 21, and then is screened in the screen frame 2. The agglomerated rice is relatively large in volume and is blocked by the baffle 7 and is close to the baffle 7. When all the normal rice passes through the gap, the drive assembly 8 is started. The operation of the drive assembly 8 drives the push plate 52 to move toward the movable door 53, and then pushes the agglomerated rice to move toward the movable door 53. The operation of the drive assembly 8 also drives the movable door 53 to rotate. After the agglomerated rice passes through the opened movable door 53, it is discharged from the conveyor 5 for separate collection and processing. Subsequently, the drive assembly 8 is reset after operation. The above operation is repeated to screen out the agglomerated deteriorated rice before the rice is screened. By arranging the transfer silo 4, the conveyor 5, the baffle 7, the push plate 52, the movable door 53 and the driving assembly 8, when the rice is transferred to the screen frame 2 via the conveyor 5, the baffle 7 blocks the agglomerated rice, and the normal rice is discharged through the gap between the baffle 7 and the conveyor 5, and then the push plate 52 and the movable door 53 are driven by the driving assembly 8 to move, so that the retained agglomerated and deteriorated rice is discharged from the conveyor 5 in time to avoid clogging the gap. In this way, the agglomerated and deteriorated rice can be pre-processed before the rice is screened, so that the agglomerated rice can be prevented from being crushed after vibration in the screen frame 2 and then mixed into the normal rice, thereby improving the quality of the rice after screening.

[0023] Example 2: See Figure 2-Figure 4, which is different from the above embodiment, two symmetrical angle irons 42 are fixed on one side of the transfer silo 4, and the two angle irons 42 are fixed on the column 3. The conveyor 5 is arranged horizontally, and inclined rods 54 are fixed on both sides of the conveyor 5, and one end of the inclined rod 54 is fixedly connected to the column 3. The discharge port 41 extends to the top of the conveyor 5, and the two side protection plates 51 are arranged as vertically arranged rectangular plates, and one end of the side protection plate 51 is provided with a through groove 55 near the baffle 7, and the movable door 53 is installed in the through groove 55. The push plate 52 is arranged on the top of the conveyor 5 and faces the movable door 53. The end of the conveyor 5 away from the baffle 7 is also provided with an end protection plate 56, and the two side edges of the end protection plate 56 are respectively fixed to the two side protection plates 51; The angle iron 42 is fixed to the column 3 and the transfer silo 4 by bolts, and two inclined rods 54 are arranged on both sides of the conveyor 5, and the two ends of the inclined rod 54 are welded to the column 3 and the conveyor 5 respectively; When in use, the rice is discharged from the discharge port 41 and falls onto the conveyor 5 . The side protection plate and the end protection plate 56 can effectively prevent the rice from falling from the conveyor 5 after being splashed.

[0024] Example 3, see Figure 4 and Figure 5 , which is different from the above-mentioned embodiment, the outer wall of the movable door 53 is fixed with two base blocks 531, a base shaft 532 is fixedly connected between the two base blocks 531, a worm gear 533 is fixedly connected to the middle of the base shaft 532, and two mounting seats 511 are fixed to the outer wall of the side guard plate 51 with a through slot 55, and the two ends of the base shaft 532 are respectively rotatably connected to the two mounting seats 511, and the driving assembly 8 includes a main motor 81, a transverse guide rod 82 and a transverse screw 83, the main motor 81 is fixed to the outer wall of one of the side guard plates 51, and the transverse screw 83 is located between the two side guard plates 51 and the two ends are respectively connected to the two side guard plates 51 is rotatably connected, one end of the transverse screw 83 is fixed to the output shaft of the main motor 81, the transverse guide rod 82 is distributed in parallel with the transverse screw 83, and the two ends of the transverse guide rod 82 are respectively fixed to the two side guard plates 51, the transverse screw 83 is threadedly connected with a transverse nut sleeve 84, and the transverse nut sleeve 84 is also movably sleeved with the transverse guide rod 82, the push plate 52 is fixed to the bottom of the transverse nut sleeve 84, one end of the guide rod passes through the outside of the side guard plate 51 and is fixed with an end block 85, and the end of the transverse screw 83 away from the main motor 81 is fixed with a worm 86, the end of the worm 86 is rotatably connected to the end block 85, and the worm 86 is meshed with the worm wheel 533; The directions of the transverse guide rod 82 and the transverse screw rod 83 are perpendicular to the conveying direction of the conveyor 5. The two base blocks 531 are located between the two mounting seats 511. In actual application, a material discharge chute is also fixed on the outer wall of the conveyor 5. The material discharge chute corresponds to the through groove 55 and is used to guide the discharged agglomerated rice. When in use, the main motor 81 is started. When the main motor 81 is running, it drives the transverse screw 83 to rotate. When the transverse screw 83 rotates, it drives the nut sleeve to move along the transverse guide rod 82, thereby driving the push plate 52 to move, and pushing the agglomerated rice retained on the conveyor 5. At the same time, when the transverse screw 83 rotates, it also drives the worm 86 to rotate. When the worm 86 rotates, it drives the worm wheel 533 to rotate. When the worm wheel 533 rotates, it drives the base shaft 532 to rotate. The rotation of the base shaft 532 causes the base block 531 and the movable door 53 to rotate around the base shaft 532, thereby causing the through slot 55 to open, and the pushed agglomerated rice passes through the through slot 55 and is discharged. By starting the main motor 81, the push plate 52 and the movable door 53 can be driven to move at the same time. The push plate 52 pushes the agglomerated rice on the conveyor 5 and discharges it from the through groove 55, so as to prevent the agglomerated rice from being retained on the conveyor 5 and blocking the gap at the bottom of the baffle 7, thereby preventing it from affecting the normal transportation of rice. In addition, the agglomerated rice can be collected uniformly, and the degree of automation is high.

[0025] Example 4, see Figure 6 and Figure 7 , different from the above embodiment, the gate valve assembly 6 includes two brackets 61, the two brackets 61 are both located at the top of the conveyor 5, the two ends of the bracket 61 are respectively fixedly connected to the two side guard plates 51, a longitudinal guide rod 62 and a longitudinal screw 63 are provided between the two brackets 61, the longitudinal screw 63 is threadedly connected to the two brackets 61, the longitudinal guide rod 62 is parallel to the longitudinal screw 63, the two ends of the longitudinal guide rod 62 are respectively fixed to the two brackets 61, a longitudinal nut sleeve 64 is threadedly connected to the longitudinal screw 63, the longitudinal nut sleeve 64 is also movably sleeved with the longitudinal guide rod 62, a gate plate 65 is fixedly connected to the bottom of the longitudinal nut sleeve 64, and the gate plate 65 is movably inserted into the discharge port 41, one end of the longitudinal screw 63 is fixedly connected to a transmission gear 66, and the top of the transverse nut sleeve 84 is fixedly connected to a transmission rack 67, and the transmission rack 67 matches the transmission gear 66 in position; The directions of the longitudinal guide rod 62 and the longitudinal screw 63 are the same as the conveying direction of the conveyor 5. In the initial state, the transmission gear 66 is located on the moving path of the transmission rack 67; When in use, the driving assembly 8 drives the transverse nut sleeve 84 to move toward the movable door 53 when it is in operation. When the transverse nut sleeve 84 moves, it drives the transmission rack 67 to move. During the movement of the transmission rack 67, it contacts the edge of the transmission gear 66 and pushes the transmission gear 66 to rotate. Then, the transmission rack 67 that continues to move separates from the transmission gear 66. When the transmission gear 66 rotates, it drives the longitudinal screw 63 to rotate. When the longitudinal screw 63 rotates, it drives the longitudinal nut sleeve 64 to move along the longitudinal guide rod 62, thereby driving the gate plate 65 to move. When the gate plate 65 moves, it opens the discharge port 41, and the rice in the transfer silo 4 is discharged onto the conveyor 5 through the discharge port 41. When the driving assembly 8 is operated again and drives the transverse nut sleeve 84 and the transmission rack 67 to move in the opposite direction, it can drive the driven gear to rotate in the opposite direction, thereby causing the gate plate 65 to be re-inserted into the feed and discharge port 41, so that the discharge port 41 is closed. Since the driving assembly 8 intermittently pushes the agglomerated rice, the rice in the transfer silo 4 is also intermittently discharged onto the conveyor 5. By providing a gate valve assembly 6 that is transmission-connected to the drive assembly 8, it is advantageous to control the discharging port 41 to be intermittently opened when the drive assembly 8 is intermittently operated, thereby realizing intermittent discharging of materials. The advantage of intermittent discharging of materials is that normal rice is prevented from being retained on the conveyor 5, and normal rice is prevented from being discharged together when the agglomerated rice is cleaned, which is more practical.

[0026] Example 5, see Figure 4 , Figure 6 and Figure 7 , which is different from the above-mentioned embodiment, a gantry 9 is provided at one end of the conveyor 5 close to the feed port 21, and the two ends of the gantry 9 are respectively fixed to the two sides of the conveyor 5, the baffle 7 is located inside the gantry 9 and is vertically slidably connected to the gantry 9, and a vertical bolt 10 is threadedly connected to the top of the gantry 9, and the bottom end of the vertical bolt 10 is rotatably connected to the top of the baffle 7; The side wall of the door frame 9 is provided with a vertical slide groove, and the edges on both sides of the baffle 7 extend into the slide groove. When in use, the height of the vertical bolt 10 can be adjusted by rotating the vertical bolt 10, thereby adjusting the height of the baffle 7. When the height of the baffle 7 changes, the height of the gap at the bottom also changes; During use, the height of the gap needs to be adjusted according to the size of different rice. At this time, the vertical bolt 10 can be rotated to drive the baffle 7 to move up and down, thereby realizing the adjustment process. If the rice that needs to be vibrated is unstored rice and there is no risk of agglomeration, the vertical bolt 10 is rotated to adjust the baffle 7 to a higher height, and then the gate valve assembly 6 is manually adjusted. When manually adjusting the gate valve assembly 6, the transmission gear 66 can be manually rotated to make the discharge port 41 always open. At this time, the rice continues to fall onto the conveyor 5, and then falls from the end of the conveyor 5 into the feed port 21, which can realize unimpeded continuous transportation of rice, further improving the scope of application of the equipment.

[0027] Example 6, see Figure 3 and Figure 8 , which is different from the above embodiment, the side wall of the transfer silo 4 is fixedly connected to an air pump 11, the exhaust end of the air pump 11 is fixedly connected to an exhaust pipe 12, the intake end of the air pump 11 is fixedly connected to an intake pipe 13, the intake pipe 13 is fixed with a first branch pipe 14 and a second branch pipe 15, the first branch pipe 14 extends to just above the feed port 21 and is fixed with a first dust hood 16, the end of the second branch pipe 15 is fixedly connected to an annular pipe 17, the annular pipe 17 is fixedly sleeved on the bottom of the transfer silo 4, a plurality of third branch pipes 18 are fixed on the annular pipe 17, the end of the third branch pipe 18 faces the discharge port 41 and is fixed with a second dust hood 19.

[0028] Among them, the exhaust pipe 12 is externally connected to an air filtration system. When in use, since there are various dusts in the rice, when the rice is scattered on the conveyor 5 or inside the screen frame 2, dust will be caused to float, thereby polluting the environment. At this time, the air pump 11 is started, and the air pump 11 generates suction. The first dust collecting hood 16 collects the dust floating at the feed port 21, and then discharges it through the first branch pipe 14, the air intake pipe 13 and the exhaust pipe 12 in sequence. The multiple second dust collecting hoods 19 collect the dust at the discharge port 41, and then discharge it through the third branch pipe 18, the annular pipe 17, the second branch pipe 15, the air intake pipe 13 and the exhaust pipe 12 in sequence. By providing the air pump 11, various pipelines and the dust collecting hood, the dust above the feed port 21 and below the discharge port 41 can be collected at the same time, thus avoiding dust pollution of the environment and being more environmentally friendly.

[0029] Embodiment 7, see Figure 1-Figure 8 A rice processing grading and screening process uses the grading and screening equipment in the above embodiment, including first screening out the agglomerated and deteriorated rice in the rice, and then grading and screening out the rice according to the particle size.

[0030] 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 grading screening device, comprising a screening machine base and a screen frame mounted on the screening machine base, wherein a feed port is provided on the top of the screen frame, and characterized in that: A column is also fixed on the base of the screening machine, and the column is located on one side of the screen frame. A transfer silo and a conveyor are fixedly installed on the side of the column close to the screen frame. A discharge port and a gate valve assembly are provided at the bottom of the transfer silo. The transfer silo is used to store rice and discharge rice onto the conveyor, and the gate valve assembly is used to control the switch of the discharge port; One end of the conveyor extends above the feed inlet, and the conveyor is used to receive the rice and convey it into the feed inlet. A baffle is installed at one end of the conveyor near the feed inlet, and a gap is provided between the bottom of the baffle and the conveyor to allow normal rice to pass through, and the baffle is used to block agglomerated rice; Side guard plates are installed on both sides of the conveyor, and push plates and movable doors are installed on the ends of the two side guard plates close to the baffles respectively. A driving assembly is installed between the two side guard plates, and the driving assembly is used to drive the push plate to move and drive the movable door to rotate; The transfer silo intermittently discharges rice onto the conveyor through the discharge port, wherein normal rice passes through the gap at the bottom of the baffle plate and is discharged into the feed port through the end of the conveyor, while agglomerated rice is blocked by the baffle plate. When the normal rice on the conveyor is discharged, the drive assembly operates, forcing the movable door to rotate, and also drives the push plate to move toward the movable door, which pushes the agglomerated rice, causing it to pass through the opened movable door and detach from the conveyor.

2. A grading and screening device according to claim 1, characterized in that: Two symmetrical angle irons are fixed on one side of the transfer silo, and the two angle irons are fixed on the columns. The conveyor is arranged horizontally, and inclined rods are fixed on both sides of the conveyor, and one end of the inclined rods is fixedly connected to the columns. The discharge port extends to the top of the conveyor, and the two side guard plates are arranged as vertically arranged rectangular plates, one of which is provided with a through groove near one end of the baffle, and the movable door is installed in the through groove, and the push plate is arranged on the top of the conveyor and opposite to the movable door. An end guard plate is also provided at the end of the conveyor away from the baffle, and the edges on both sides of the end guard plate are respectively fixed to the two side guard plates.

3. A grading and screening device according to claim 2, characterized in that: Two base blocks are fixed on the outer wall of the movable door, a base shaft is fixedly connected between the two base blocks, a worm gear is fixedly connected to the middle of the base shaft, and two mounting seats are fixed on the outer wall of the side protection plate with a through groove, and both ends of the base shaft are rotatably connected to the two mounting seats respectively.

4. A grading and screening device according to claim 3, characterized in that: The driving assembly includes a main motor, a transverse guide rod and a transverse screw. The main motor is fixed to the outer wall of one of the side protective plates. The transverse screw is located between the two side protective plates and has two ends rotatably connected to the two side protective plates. One end of the transverse screw is fixed to the output shaft of the main motor. The transverse guide rod is distributed parallel to the transverse screw. The two ends of the transverse guide rod are respectively fixed to the two side protective plates. A transverse nut sleeve is threadedly connected to the transverse screw. The transverse nut sleeve is also movably connected to the transverse guide rod. The push plate is fixed to the bottom of the transverse nut sleeve.

5. A grading and screening device according to claim 4, characterized in that: One end of the guide rod passes through the outside of the side guard plate and is fixed with an end block, and the end of the transverse screw away from the main motor is fixed with a worm, the end of the worm is rotatably connected to the end block, and the worm is meshed with the worm wheel.

6. A grading and screening device according to claim 4, characterized in that: The gate valve assembly includes two brackets, both of which are located at the top of the conveyor, and both ends of the brackets are fixedly connected to the two side protection plates respectively. A longitudinal guide rod and a longitudinal screw are provided between the two brackets, and the longitudinal screw is threadedly connected to the two brackets. The longitudinal guide rod is parallel to the longitudinal screw, and both ends of the longitudinal guide rod are fixed to the two brackets respectively. A longitudinal nut sleeve is threadedly connected to the longitudinal screw, and the longitudinal nut sleeve is also movably connected to the longitudinal guide rod. A gate plate is fixedly connected to the bottom of the longitudinal nut sleeve, and the gate plate is movably inserted into the discharge port.

7. A grading and screening device according to claim 6, characterized in that: One end of the longitudinal screw is fixedly connected with a transmission gear, and the top of the transverse nut sleeve is fixedly connected with a transmission rack, and the transmission rack matches the transmission gear in position.

8. A grading and screening device according to claim 1, characterized in that: A gantry is provided at one end of the conveyor near the feed port, and both ends of the gantry are respectively fixed to both sides of the conveyor, the baffle is located inside the gantry and vertically slidably connected to the gantry, a vertical bolt is threadedly connected to the top of the gantry, and the bottom end of the vertical bolt is rotatably connected to the top of the baffle.

9. A grading and screening device according to claim 1, characterized in that: An air pump is fixedly connected to the side wall of the transfer silo, an exhaust pipe is fixed to the exhaust end of the air pump, an intake pipe is fixed to the intake end of the air pump, a first branch pipe and a second branch pipe are fixed to the intake pipe, the first branch pipe extends to just above the feed port and is fixed with a first dust hood, an end of the second branch pipe is fixedly connected to an annular pipe, the annular pipe is fixedly sleeved on the bottom of the transfer silo, a plurality of third branch pipes are fixed to the annular pipe, the end of the third branch pipe faces the discharge port and is fixed with a second dust hood.

10. A rice processing grading and screening process, characterized in that: The grading and screening process for rice processing uses a grading and screening device as described in any one of claims 1-9.

Images