Vertical rice mill

Abstract

The application discloses a vertical rice mill, when the screening assembly needs to be disassembled and cleaned, first, the maintenance door is disassembled, the rotation of the rotating seat ring is released from the rotation limiting of the limiting assembly, at this time, because the end surface of the connecting pipeline connected with the rice mill box is an arc surface and the center line is coincident with the rotation axis of the hollow roller, the screen assembly can rotate with the rotating seat ring, in the rotating process, the connecting piece between the left bracket and the right bracket is first disassembled, when the right bracket rotates to the position corresponding to the maintenance door, the right bracket is disassembled, thereby the combination of the right bracket and the plurality of right screen meshes is taken out from the maintenance door, when the left bracket rotates to the position corresponding to the maintenance door, the left bracket is disassembled, thereby the combination of the left bracket and the plurality of left screen meshes is taken out from the maintenance door, finally, the screen assembly is conveniently disassembled and installed, so that the screen assembly is conveniently disassembled and cleaned.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grain processing equipment, and particularly relates to a vertical rice mill. BACKGROUND

[0002] The working principle of the vertical rice mill is as follows: the brown rice obtained after processing by a huller is pushed into the bottom of a rice milling chamber by a feeding device of the vertical rice mill and is conveyed between a rice roller assembly and a screen assembly; in the process of rotating the rice roller assembly driven by a power device, the brown rice moves upward along the surface of the rice roller assembly in a spiral manner (the surface of the rice roller assembly has a spiral channel), friction is generated between the rice roller assembly and the brown rice, between the screen assembly and the brown rice, and between the brown rice and the brown rice, so that the brown rice is milled white, and is discharged from a rice outlet pipeline; at the same time, air flow generated by a fan is blown into a hollow shaft (the rice roller assembly is installed on the hollow shaft) linked with the power device from top to bottom, flows along the hollow shaft, the rice roller assembly and the screen assembly, cools the brown rice and blows out rice bran, and the rice mill is connected with a rice bran suction pipeline of an external rice bran suction device, so that the rice bran is rapidly discharged from the screen holes of the screen assembly and is sucked away by the external rice bran suction device. For example, the content disclosed in the vertical intelligent rice mill (CN118384944A) published on July 26, 2024.

[0003] After the screen assembly is used for a long time, the surface of the screen assembly will be attached with rice bran because the rice bran has a certain humidity, at this time, the screen assembly needs to be disassembled regularly for cleaning, so as to prevent the growth and reproduction of microorganisms and ensure the product quality. However, the existing disassembly and cleaning mode has the problem of inconvenient disassembly and assembly. SUMMARY

[0004] The present application aims to provide a vertical rice mill which has the effect of facilitating disassembly and assembly of the screen assembly for cleaning.

[0005] The technical problem is solved by the following technical scheme: a vertical rice mill comprises a frame, a rice milling base, a rice milling box arranged on the rice milling base, a hollow roller rotatably connected between the frame and the top of the rice milling box and penetrating the rice milling base upward, a milling roller assembly arranged on the periphery of the hollow roller, a screen assembly arranged between the rice milling base and the top of the rice milling box and surrounding the milling roller assembly, a power device arranged on the frame and driving the hollow roller to rotate, a feeding device arranged on the frame and communicating with the rice milling base and conveying the brown rice to the space between the milling roller assembly and the screen assembly, a rice outlet pipeline arranged above the periphery of the rice milling box and communicating with the screen assembly to receive the materials from the space between the milling roller assembly and the screen assembly, a blowing mechanism arranged between the frame and the top of the rice milling box and blowing air from the hollow roller, and a bran suction pipeline arranged on the frame and communicating with the rice milling base, wherein the bran blown from the screen assembly flows along the hollow cavity between the rice milling box and the screen assembly, the channel of the rice milling base and the bran suction pipeline, the screen assembly comprises a left bracket in a semicircular shape, a right bracket in a semicircular shape, a plurality of left screens arranged on the left bracket, a plurality of right screens arranged on the right bracket, a connecting piece arranged between the left bracket and the right bracket, the uppermost right screen is provided with a communication port communicating with the discharging mechanism, and the right bracket is provided with a connecting pipeline corresponding to the communication port and communicating with the rice outlet pipeline; the rice milling base is rotatably connected with a rotating seat ring, the bottom of the left bracket and the right bracket is arranged on the rotating seat ring, the top of the rice milling box is provided with a positioning seat ring abutting against the inner circle of the top of the left bracket and the right bracket, the end surface of the connecting pipeline connected with the rice milling box is in an arc shape and the center line coincides with the rotating axis of the hollow roller, and a limiting assembly limiting or unlocking the rotation of the rotating seat ring is arranged between the rice milling box, the rice milling base and the rotating seat ring; the periphery of the rice milling box is detachably provided with a maintenance door facilitating the removal of the left bracket and the right bracket.

[0006] When the screen assembly needs to be disassembled and cleaned, the maintenance door is first disassembled to remove the rotation limitation of the rotating seat ring by the limiting assembly, the screen assembly can rotate with the rotating seat ring due to the arc-shaped end surface of the connecting pipeline connected with the rice milling box and the center line coinciding with the rotating axis of the hollow roller, the connecting piece between the left bracket and the right bracket is disassembled during the rotation, the right bracket is disassembled when the right bracket rotates to the position corresponding to the maintenance door, the combination of the right bracket and the plurality of right screens is removed from the maintenance door, the left bracket is disassembled when the left bracket rotates to the position corresponding to the maintenance door, and the combination of the left bracket and the plurality of left screens is removed from the maintenance door, so that the screen assembly is conveniently disassembled and installed, and the screen assembly is conveniently disassembled and cleaned.

[0007] The further arrangement of the present application is that the limiting assembly comprises a support arranged inside the rice milling base, two telescopic shafts arranged on the support and telescopically arranged along the direction close to or away from the rotating race, a first compression spring arranged between the telescopic shafts and the support and driving the telescopic shafts to move in the direction away from the rotating race, and limiting blocks arranged at the ends of the telescopic shafts, and the rotating race is provided with limiting grooves corresponding to the limiting blocks, and a linkage assembly is arranged between the telescopic shafts and the maintenance door to overcome the elastic force of the first compression spring during installation of the maintenance door so that the limiting blocks are embedded in the limiting grooves.

[0008] By adopting the above technical scheme, the linkage assembly is cancelled during dismounting of the maintenance door, the limiting seat is automatically separated from the limiting groove during resetting of the first compression spring, thereby unlocking the limiting of the rotating race, so that the rotating race and the screen assembly can be rotated and dismounted, and during installation of the maintenance door, the linkage assembly overcomes the elastic force of the first compression spring to embed the limiting blocks in the limiting grooves, thereby limiting the rotation of the rotating race, so as to ensure that the connecting pipeline can be aligned with the rice outlet pipeline.

[0009] The further arrangement of the present application is that the two sides of the rice milling box are respectively provided with two vertical rails, the length of the vertical rails is less than 10 cm, the two sides of the maintenance door are respectively provided with two lifting blocks embedded in the vertical rails during installation of the maintenance door, and the vertical rails are screw-connected with locking limiting bolts embedded in the holes of the lifting blocks; the linkage assembly comprises first wedges arranged at the ends of the telescopic shafts away from the rotating race, and second wedges arranged inside the maintenance door and abutting against the two first wedges, and during movement of the lifting blocks of the maintenance door along the vertical rails downward to the position, the second wedges drive the first wedges to move to overcome the elastic force of the first compression spring.

[0010] By adopting the above technical scheme, after installation of the maintenance door, the two lifting blocks are embedded in the vertical rails, so that the locking limiting bolts are embedded in the holes of the lifting blocks to realize connection and fixation of the maintenance door; and during movement of the lifting blocks along the vertical rails downward, the second wedges can be aligned with the first wedges, so that the second wedges drive the first wedges to move to overcome the elastic force of the first compression spring.

[0011] The further arrangement of the application is that the rice milling tank is provided with a brush assembly on the side away from the rice outlet pipeline, the brush assembly comprises a support strip extending in the vertical direction inside the rice milling tank, and a plurality of brush parts arranged on the support strip and used for brushing off the attachments on the part of the left screen not covered by the left bracket and the part of the right screen not covered by the right bracket; during the rotation of the rotating seat, the plurality of brush parts brush off the attachments on the part of the left screen not covered by the left bracket and the part of the right screen not covered by the right bracket, and the connecting pipeline does not interfere with the brush assembly during the rotation.

[0012] By adopting the above technical scheme, after the maintenance door is disassembled, the rotating seat can be rotated, the screen assembly is driven to rotate by the rotating seat, the brush parts can brush off the attachments on the part of the left screen not covered by the left bracket and the part of the right screen not covered by the right bracket, thereby playing the function of regularly cleaning the attachments (attached rice bran), preventing the growth and reproduction of microorganisms, and ensuring the product quality.

[0013] The further arrangement of the application is that the upper ends of the support strips are provided with connecting shafts penetrating out of the rice milling tank, one end of the connecting shaft penetrating out of the rice milling tank is provided with an anti-coming-off nut, and a second compression spring is sleeved on the connecting shaft and abuts against the rice milling tank and the support strip.

[0014] By adopting the above technical scheme, the support strips can be elastically stretched and contracted due to the arrangement of the connecting shafts and the second compression springs, so that the support strips can move and can be retracted when encountering the more protruding parts of the left bracket and the right bracket, thereby avoiding greater interference.

[0015] The further arrangement of the application is that the left bracket is provided with a plurality of left insertion sleeves on both sides, the right bracket is provided with a plurality of right insertion sleeves on both sides, the left screen is provided with left insertion pieces inserted into the two left insertion sleeves during deformation on both sides, and the right screen is provided with right insertion pieces inserted into the two right insertion sleeves during deformation on both sides.

[0016] By adopting the above technical scheme, the left screen and the right screen are thin and have elasticity, and the left screen is provided with the left insertion pieces inserted into the two left insertion sleeves during deformation on both sides, and the right screen is provided with the right insertion pieces inserted into the two right insertion sleeves during deformation on both sides, thereby achieving the assembly of the left screen and the right screen.

[0017] The further arrangement of the application is that the connecting pieces are a plurality of bolts and nuts arranged between the left bracket and the right bracket.

[0018] The further arrangement of the present application is that the cleaning process of the screen assembly comprises the following steps: (S1) cleaning without disassembly: by disassembling the maintenance door, the linkage assembly drives the action on the limiting assembly, so that the rotating seat ring can rotate, thereby driving the screen assembly to rotate, so that the bristle assembly brushes off the attached matter on the part of the left screen not covered by the left bracket and the part of the right screen not covered by the right bracket, and the attached matter after brushing is blown to the rice bran channel in the subsequent processing process; (S2) cleaning with disassembly: by disassembling the maintenance door, the linkage assembly drives the action on the limiting assembly, so that the rotating seat ring can rotate, and the connecting piece between the left bracket and the right bracket is removed, when the right bracket is rotated to the position corresponding to the maintenance door, the right bracket is disassembled, so that the combination of the right bracket and the plurality of right screens is taken out from the maintenance door, when the left bracket is rotated to the position corresponding to the maintenance door, the left bracket is disassembled, so that the combination of the left bracket and the plurality of left screens is taken out from the maintenance door, and cleaning with disassembly is carried out. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the front view of the present application;

[0020] Figure 2 is the left view of the present application;

[0021] Figure 3 is the schematic view of the structure explosion of the maintenance door in the present application;

[0022] Figure 4 is the schematic view of the structure explosion of the maintenance door and the screen assembly in the present application;

[0023] Figure 5 is the structural schematic view of the screen assembly in the present application (after deleting the connecting piece 65);

[0024] Figure 6 is Figure 5 is the local enlarged view at A in 4;

[0025] Figure 7 is the local structural schematic view of the rice milling base, the maintenance door and the screen assembly in the present application;

[0026] Figure 8 is Figure 7 is the local enlarged view at B in 6;

[0027] Figure 9 is the local enlarged view at C in 4.

[0028] Attached reference numerals: 1. Frame; 2. Rice milling base; 21. Rotating seat ring; 211. Limiting groove; 3. Rice milling box; 31. Positioning seat ring; 32. Maintenance door; 321. Lifting block; 33. Vertical track; 34. Locking limit bolt; 4. Hollow roller; 5. Milling roller assembly; 6. Screen assembly; 61. Left bracket; 611. Left insert sleeve; 62. Right bracket; 621. Connecting pipe; 622. Right insert sleeve; 63. Left screen; 631. Left insert plate; 64. Right screen; 641. Connecting port; 64 2. Right insert piece; 65. Connector; 7. Power unit; 8. Feeding device; 9. Rice outlet pipe; 10. Blowering mechanism; 11. Bran suction pipe; 12. Limiting component; 121. Bracket; 122. Telescopic shaft; 123. First compression spring; 124. Limiting block; 13. Linkage component; 131. First wedge block; 132. Second wedge block; 14. Brush assembly; 141. Support bar; 142. Brush part; 143. Connecting shaft; 144. Anti-loosening nut; 145. Second compression spring. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Example: A vertical rice milling machine, such as Figures 1 to 4 As shown, the system includes a frame 1, a rice milling base 2, a rice milling box 3 mounted on the rice milling base 2, a hollow roller 4 rotatably connected between the top of the frame 1 and the top of the rice milling box 3 and passing upward through the rice milling base 2, a roller assembly 5 disposed around the hollow roller 4, a screen assembly 6 disposed between the top of the rice milling base 2 and the top of the rice milling box 3 and surrounding the roller assembly 5, a power unit 7 mounted on the frame 1 and driving the hollow roller 4 to rotate, and a device mounted on the frame 1 and communicating with the rice milling base 2 to transport brown rice to the roller assembly 5 and the screen. The components include: a feeding device 8 between components 6; a rice discharge pipe 9 positioned above the periphery of the rice milling box 3 and connected to the screen assembly 6 to receive material from between the milling roller assembly 5 and the screen assembly 6; a blower mechanism 10 positioned between the frame 1 and the top of the rice milling box 3 to allow airflow from the hollow roller 4; and a bran suction pipe 11 positioned on the frame 1 and connected to the rice milling base 2. Rice bran blown from the screen assembly 6 flows along the cavity between the rice milling box 3 and the screen assembly 6, and the channel of the rice milling base 2, to the bran suction pipe 11. The overall structure of the vertical rice milling machine is existing technology and will not be described in detail here.

[0031] like Figures 3 to 6As shown, the screen assembly 6 comprises a left bracket 61 in semicircle, a right bracket 62 in semicircle, a plurality of left screens 63 mounted on the left bracket 61, a plurality of right screens 64 mounted on the right bracket 62, a connecting piece 65 arranged between the left bracket 61 and the right bracket 62, the uppermost right screen 64 has a communicating port 641 communicating with the discharging mechanism, the right bracket 62 is provided with a connecting pipeline 621 corresponding to the communicating port 641 and communicating to the rice discharging pipeline 9. The left bracket 61 is provided with a plurality of left sleeves 611 on both sides, the right bracket 62 is provided with a plurality of right sleeves 622 on both sides, the left screen 63 is provided with a left insert piece 631 inserted into the two left sleeves 611 during deformation, and the right screen 64 is provided with a right insert piece 642 inserted into the two right sleeves 622 during deformation. The connecting piece 65 is a plurality of bolts and nuts arranged between the left bracket 61 and the right bracket 62.

[0032] As shown in Figure 3 , Figure 7 and Figure 8 , the rice milling base 2 is rotatably connected with a rotating seat ring 21 (rotatably connected through a bearing), the bottom of the left bracket 61 and the right bracket 62 is arranged on the rotating seat ring 21 (fixed by bolts, but not shown in the figure), the top of the rice milling box 3 is provided with a positioning seat ring 31 abutting on the inner ring of the top of the left bracket 61 and the right bracket 62, the end surface of the connecting pipeline 621 connected with the rice milling box 3 is an arc surface and the center line coincides with the rotating axis of the hollow roller 4, and a limiting assembly 12 limiting or unlocking the rotation of the rotating seat ring 21 is arranged between the rice milling box 3, the rice milling base 2 and the rotating seat ring 21. The periphery of the rice milling box 3 is detachably provided with a maintenance door 32 facilitating the removal of the left bracket 61 and the right bracket 62. The limiting assembly 12 comprises a bracket 121 arranged on the inner side of the rice milling base 2, two telescopic shafts 122 arranged on the bracket 121 in the direction of approaching or moving away from the rotating seat ring 21, a first compression spring 123 arranged between the telescopic shaft 122 and the bracket 121 and driving the telescopic shaft 122 to move in the direction of moving away from the rotating seat ring 21, a limiting block 124 arranged at the end of the telescopic shaft 122, a limiting groove 211 arranged on the periphery of the rotating seat ring 21 corresponding to the limiting block 124, and a linkage assembly 13 arranged between the telescopic shaft 122 and the maintenance door 32 and overcoming the elastic force of the first compression spring 123 during the installation of the maintenance door 32 so that the limiting block 124 is embedded into the limiting groove 211.

[0033] As shown in Figure 4 , Figures 7 to 9As shown, two vertical tracks 33 are arranged on two sides of the milling box 3 respectively, the length of the vertical tracks 33 is less than 10 cm, two lifting blocks 321 are arranged on two sides of the maintenance door 32 respectively, the lifting blocks 321 are embedded into the vertical tracks 33 during installation of the maintenance door 32, the vertical tracks 33 are screw-connected with locking limiting bolts 34 embedded into the holes of the lifting blocks 321; the linkage assembly 13 comprises first wedges 131 arranged on the end of the telescopic shaft 122 away from the rotating bezel 21, and second wedges 132 arranged on the inner side of the maintenance door 32 and abutting against the two first wedges 131, during movement of the lifting blocks 321 of the maintenance door 32 along the vertical tracks 33 to the position, the second wedges 132 drive the first wedges 131 to move to overcome the elastic force of the first compression springs 123.

[0034] As shown in Figure 4 , Figure 5 and Figure 9 , the milling box 3 is arranged with a brush assembly 14 on the side away from the rice outlet pipeline 9, the brush assembly 14 comprises a support strip 141 arranged on the inner side of the milling box 3 and extending along the vertical direction, and a plurality of brush parts 142 arranged on the support strip 141 and used for brushing off the attachments on the part of the left screen 63 not covered by the left bracket 61 and the part of the right screen 64 not covered by the right bracket 62, during rotation of the rotating bezel 21, the plurality of brush parts 142 brush off the attachments on the part of the left screen 63 not covered by the left bracket 61 and the part of the right screen 64 not covered by the right bracket 62, and the connecting pipeline 621 does not interfere with the brush assembly 14 during rotation. The upper ends of the two ends of the support strip 141 are arranged with connecting shafts 143 penetrating out of the milling box 3, one end of the connecting shaft 143 penetrating out of the milling box 3 is arranged with a anti-loosening nut 144, and the connecting shaft 143 is sleeved with a second compression spring 145 abutting against the milling box 3 and the support strip 141.

[0035] The cleaning process of the screen assembly 6 includes the following steps: (S1) cleaning without disassembly: by disassembling the maintenance door 32, the linkage assembly 13 drives the action on the limiting assembly 12, so that the rotating seat 21 can rotate, thereby driving the screen assembly 6 to rotate, so that the bristle assembly 14 brushes off the attached objects on the part of the left screen 63 not covered by the left bracket 61 and the part of the right screen 64 not covered by the right bracket 62, and the brushed off attached objects are blown to the rice bran channel in the subsequent processing process; (S2) cleaning with disassembly: by disassembling the maintenance door 32, the linkage assembly 13 drives the action on the limiting assembly 12, so that the rotating seat 21 can rotate, the connecting piece 65 between the left bracket 61 and the right bracket 62 is removed, when the right bracket 62 is rotated to the position corresponding to the maintenance door 32, the right bracket 62 is disassembled, thereby taking out the combination of the right bracket 62 and the plurality of right screens 64 from the maintenance door 32, when the left bracket 61 is rotated to the position corresponding to the maintenance door 32, the left bracket 61 is disassembled, thereby taking out the combination of the left bracket 61 and the plurality of left screens 63 from the maintenance door 32, and cleaning with disassembly is performed.

[0036] Effect: when the screen assembly needs to be disassembled and cleaned, the maintenance door 32 is first disassembled, the rotation restriction of the limiting assembly 12 on the rotating seat 21 is released, at this time, because the end surface of the connecting pipeline 621 connected with the rice milling tank 3 is an arc surface and the center line coincides with the rotation axis of the hollow roller 4, the screen assembly 6 can rotate with the rotating seat 21, the connecting piece 65 between the left bracket 61 and the right bracket 62 is disassembled during rotation, when the right bracket 62 is rotated to the position corresponding to the maintenance door 32, the right bracket 62 is disassembled, thereby taking out the combination of the right bracket 62 and the plurality of right screens 64 from the maintenance door 32, when the left bracket 61 is rotated to the position corresponding to the maintenance door 32, the left bracket 61 is disassembled, thereby taking out the combination of the left bracket 61 and the plurality of left screens 63 from the maintenance door 32, finally, the screen assembly 6 is conveniently disassembled and installed, so as to realize the effect of conveniently disassembling and cleaning the screen assembly 6.

[0037] During the disassembly process of the maintenance door 32, the linkage assembly 13 cancels the action, the limiting seat is automatically separated from the limiting groove 211 during the resetting process of the first compression spring 123, thereby unlocking the limiting of the rotating seat 21, so that the rotating seat 21 and the screen assembly 6 can be rotated and disassembled, at the same time, during the installation process of the maintenance door 32, the linkage assembly 13 overcomes the elastic force of the first compression spring 123 to make the limiting block 124 embedded in the limiting groove 211, thereby limiting the rotation of the rotating seat 21, so as to ensure that the connecting pipeline 621 can be aligned with the rice outlet pipeline 9.

[0038] After the installation of the maintenance door 32, the two lifting blocks 321 are embedded in the vertical rail 33, facilitating the connection and fixation of the maintenance door 32 by embedding the locking limiting bolts 34 in the holes of the lifting blocks 321; meanwhile, during the downward movement of the lifting blocks 321 along the vertical rail 33, the second wedge-shaped block 132 can be aligned with the first wedge-shaped block, so that the second wedge-shaped block 132 drives the first wedge-shaped block 131 to move to overcome the elastic force of the first compression spring 123. After the maintenance door 32 is disassembled, the rotating seat 21 can be rotated, and the screen assembly 6 is driven to rotate by the rotating seat 21, so that the brush part 142 can brush off the attached objects on the part of the left screen 63 not covered by the left bracket 61 and the part of the right screen 64 not covered by the right bracket 62, thereby achieving the function of periodically cleaning the attached objects (attached rice bran); in cooperation with the periodic disassembly and cleaning of the screen assembly 6, the growth and reproduction of microorganisms are prevented, so as to ensure the product quality. The support strip 141 can be elastically stretched and contracted due to the arrangement of the connecting shaft 143 and the second compression spring 145, so that the support strip 141 can move and retract when encountering the more protruding parts of the left bracket 61 and the right bracket 62, thereby avoiding greater interference. The left screen 63 and the right screen 64 are relatively thin and have a certain elasticity, and at this time, the left screen 63 is provided with the left insertion piece 631 inserted into the two left insertion sleeves 611 during the deformation process on both sides of the left screen 63, and the right screen 64 is provided with the right insertion piece 642 inserted into the two right insertion sleeves 622 during the deformation process on both sides of the right screen 64, thereby achieving the assembly of the left screen 63 and the right screen 64.

[0039] The specific embodiments are only an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, as long as the modifications are within the scope of the claims of the present application.

Claims

1. A vertical rice mill, comprising a frame (1), a rice milling base (2), a rice milling box (3) arranged on the rice milling base (2), a hollow roller (4) rotatably connected between the frame (1) and the top of the rice milling box (3) and upwardly penetrating the rice milling base (2), a milling roller assembly (5) arranged on the peripheral side of the hollow roller (4), a screen assembly (6) arranged between the rice milling base (2) and the top of the rice milling box (3) and surrounding the milling roller assembly (5), a power device (7) arranged on the frame (1) and driving the hollow roller (4) to rotate, a feeding device (8) arranged on the frame (1) and communicating with the rice milling base (2) and conveying the rough rice to the space between the milling roller assembly (5) and the screen assembly (6), a rice outlet pipeline (9) arranged above the peripheral side of the rice milling box (3) and communicating with the screen assembly (6) to receive the material from the space between the milling roller assembly (5) and the screen assembly (6), a blowing mechanism (10) arranged between the frame (1) and the top of the rice milling box (3) and enabling air flow to blow out from the hollow roller (4), and a bran suction pipeline (11) arranged on the frame (1) and communicating to the rice milling base (2), wherein the bran blown out from the screen assembly (6) flows along the cavity between the rice milling box (3) and the screen assembly (6), the channel of the rice milling base (2) and the bran suction pipeline (11). The screen assembly (6) comprises a left bracket (61) in a semicircular shape, a right bracket (62) in a semicircular shape, a plurality of left screens (63) mounted on the left bracket (61), a plurality of right screens (64) mounted on the right bracket (62), a connecting piece (65) arranged between the left bracket (61) and the right bracket (62), and the uppermost right screen (64) having a communication port (641) communicating with the discharge mechanism, and the right bracket (62) is provided with a connecting pipeline (621) corresponding to the communication port (641) and communicating to the rice outlet pipeline (9). The rice milling base (2) is rotatably connected with a rotating seat ring (21), the bottom of the left bracket (61) and the right bracket (62) is arranged on the rotating seat ring (21), the top of the rice milling box (3) is provided with a positioning seat ring (31) abutting the inner ring of the top of the left bracket (61) and the right bracket (62), the end surface of the connecting pipeline (621) connected with the rice milling box (3) is an arc surface and the center line coincides with the rotation axis of the hollow roller (4), and a limiting assembly (12) limiting or unlocking the rotation of the rotating seat ring (21) is arranged between the rice milling box (3), the rice milling base (2) and the rotating seat ring (21). A maintenance door (32) for conveniently taking out the left bracket (61) and the right bracket (62) is detachably arranged on the peripheral side of the rice milling box (3). The limiting assembly (12) comprises a support (121) arranged inside the rice milling base (2), two telescopic shafts (122) arranged on the support (121) and telescopically arranged along the direction close to or away from the rotating race (21), a first compression spring (123) arranged between the telescopic shaft (122) and the support (121) and driving the telescopic shaft (122) to move downward away from the rotating race (21), and limiting blocks (124) arranged at the ends of the telescopic shaft (122), and the rotating race (21) is provided with limiting grooves (211) corresponding to the limiting blocks (124), and a linkage assembly (13) is arranged between the telescopic shaft (122) and the maintenance door (32) and overcomes the elastic force of the first compression spring (123) during installation of the maintenance door (32) to enable the limiting blocks (124) to be embedded in the limiting grooves (211). The rice milling box (3) is provided with two vertical rails (33) on both sides, the length of the vertical rails (33) is less than 10 cm, the maintenance door (32) is provided with two lifting blocks (321) on both sides and embedded in the vertical rails (33) during installation of the maintenance door (32), and the vertical rails (33) are threadedly connected with locking limiting bolts (34) embedded in the holes of the lifting blocks (321); the linkage assembly (13) comprises first wedges (131) arranged at one end of the telescopic shaft (122) away from the rotating race (21), and second wedges (132) arranged inside the maintenance door (32) and abutting against the two first wedges (131), and during movement of the lifting blocks (321) of the maintenance door (32) along the vertical rails (33) to the position, the second wedges (132) drive the first wedges (131) to move to overcome the elastic force of the first compression spring (123).

2. A vertical rice mill as claimed in claim 1 wherein: The rice milling box (3) is provided with a brush assembly (14) away from the rice outlet pipeline (9), the brush assembly (14) comprises a support strip (141) arranged inside the rice milling box (3) and extending along the vertical direction, and a plurality of brush parts (142) arranged on the support strip (141) and used for brushing off the attached matters on the part of the left screen (63) not covered by the left bracket (61) and the part of the right screen (64) not covered by the right bracket (62), and during rotation of the rotating race (21), the plurality of brush parts (142) brush off the attached matters on the part of the left screen (63) not covered by the left bracket (61) and the part of the right screen (64) not covered by the right bracket (62), and the connecting pipeline (621) does not interfere with the brush assembly (14) during rotation.

3. A vertical rice mill as claimed in claim 2 wherein: The upper ends of the support strip (141) are provided with connecting shafts (143) penetrating out of the rice milling box (3), one end of the connecting shaft (143) penetrating out of the rice milling box (3) is provided with a anti-loosening nut (144), and a second compression spring (145) is arranged on the connecting shaft (143) and abuts against the rice milling box (3) and the support strip (141).

4. A vertical rice mill as claimed in claim 3 wherein: The left bracket (61) is provided with a plurality of left insertion sleeves (611) on both sides, the right bracket (62) is provided with a plurality of right insertion sleeves (622) on both sides, the left screen (63) is provided with a left insertion sheet (631) inserted into the two left insertion sleeves (611) during the deformation process on both sides, and the right screen (64) is provided with a right insertion sheet (642) inserted into the two right insertion sleeves (622) during the deformation process on both sides.

5. A vertical rice mill as claimed in claim 4 wherein: The connecting piece (65) is a plurality of bolts and nuts arranged between the left bracket (61) and the right bracket (62).

6. A vertical rice mill as claimed in claim 5 wherein: The cleaning process of the screen assembly (6) comprises the following steps: (S1) Cleaning without disassembly: by disassembling the maintenance door (32), the linkage assembly (13) drives the action on the limiting assembly (12), so that the rotating seat ring (21) can rotate, thereby driving the screen assembly (6) to rotate, so that the bristle assembly (14) brushes off the attached matter on the part of the left screen (63) not covered by the left bracket (61) and the part of the right screen (64) not covered by the right bracket (62), and the attached matter after brushing is blown to the rice bran channel in the subsequent processing process; (S2) Cleaning after disassembly: by disassembling the maintenance door (32), the linkage assembly (13) drives the action on the limiting assembly (12), so that the rotating seat ring (21) can rotate, the connecting piece (65) between the left bracket (61) and the right bracket (62) is removed, when the right bracket (62) is rotated to the position corresponding to the maintenance door (32), the right bracket (62) is disassembled, thereby taking out the combination of the right bracket (62) and the plurality of right screens (64) from the maintenance door (32), when the left bracket (61) is rotated to the position corresponding to the maintenance door (32), the left bracket (61) is disassembled, thereby taking out the combination of the left bracket (61) and the plurality of left screens (63) from the maintenance door (32), and cleaning after disassembly.

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