Fine-whitening rice milling mechanism

Abstract

The mechanism comprises a main shaft, the two ends of the main shaft are sleeved with a feeding bearing seat and a discharging bearing seat respectively, a rice sieve assembly and a sieve frame assembly are arranged at the position, between the feeding bearing seat and the discharging bearing seat, of the outer side of the main shaft, and the rice sieve assembly is arranged on the inner side of the sieve frame assembly; a bran discharging chamber is formed between the rice sieve assembly and the sieve frame assembly, a roller assembly and a propeller assembly are arranged at the position, between the feeding bearing seat and the discharging bearing seat, of the main shaft in a sleeving mode, the roller assembly comprises at least two rollers, the propeller assembly comprises at least two propellers, and a rice milling chamber is formed between the rice sieve assembly and the roller assembly. The feeding bearing seat and the discharging bearing seat are provided with a feeding port and a discharging port which are communicated with the interior of the rice milling chamber respectively. At least one conveyor is additionally arranged on the basis of a traditional rice milling mechanism, and the polishing, whitening and shelling effects of brown rice can be guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of rice milling, and in particular relates to a refined rice milling mechanism. Background Art

[0002] The rice milling mechanism is a mechanism used in a rice milling machine to peel and whiten brown rice, and it is also a relatively important mechanism in the rice milling mechanism. The rice milling mechanism of an existing rice milling machine generally includes one or two rollers, and is equipped with a conveyor to convey the brown rice. In the existing design, a sand roller is generally provided, and a conveyor is provided at the front end of the sand roller, and some are also provided with a polishing head or an iron roller at the rear end of the sand roller. In the actual process of polishing brown rice, a small amount of rice grains are often mixed in the brown rice; during polishing, since only one propeller is provided on the main shaft, after the brown rice is roughened and polished by the sand roller, the pressure is weakened during the process of entering the polishing head or iron roller provided at the rear end, forcing the pressure at the rice outlet to increase, thereby causing problems such as broken rice and high rice temperature, which ultimately affects the effect of polishing, whitening and shelling of brown rice.

[0003] In the existing design, the invention patent with publication number CN115283048A discloses a rice milling machine, which includes a rice milling device, which includes: a main shaft, which is arranged in the vertical direction; a driving assembly, the driving end of which is connected to the main shaft and is used to drive the main shaft to rotate around the vertical direction; an emery roller, which is sleeved on the outside of the main shaft, the emery roller extends in the vertical direction, and the main shaft drives the emery roller to rotate around the vertical direction; a rice screen, which is sleeved on the outside of the emery roller, and a milling chamber is formed between the rice screen and the emery roller, and the milling chamber is provided with a milling feed top port and a milling discharge bottom port; a rice milling shell, which is sleeved on the outside of the rice screen, and a bran discharge chamber is formed between the rice screen and the rice milling shell. It also includes a screw conveyor, which is arranged on the upper part of the milling chamber and sleeved on the outside of the main shaft.

[0004] From the description of the above existing designs, it can be seen that the rice milling machine or rice milling mechanism in the existing designs generally has only one conveyor, which cannot solve the problems of rice breakage and high rice temperature caused by the weakened pressure after the brown rice is roughened and polished by the sand roller, and cannot ensure the effect of polishing, whitening and shelling the brown rice. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a white rice milling mechanism for the above-mentioned deficiencies of the prior art, which adds at least one conveyor to the traditional rice milling mechanism to ensure the polishing, whitening and hulling effects of brown rice.

[0006] The technical solution adopted by the present invention is: a refined rice milling mechanism, comprising a main shaft, wherein both ends of the main shaft are respectively sleeved with a feed bearing seat and a discharge bearing seat, and one end of the main shaft close to the feed bearing seat or the discharge bearing seat is also sleeved with a transmission pulley, and a rice screen assembly and a screen frame assembly are respectively provided at the outer side of the main shaft between the feed bearing seat and the discharge bearing seat, the rice screen assembly is arranged on the inner side of the screen frame assembly, and a bran discharge chamber is formed between the rice screen assembly and the screen frame assembly, and a roller assembly and a propeller assembly are sleeved at the position of the main shaft between the feed bearing seat and the discharge bearing seat, the roller assembly includes at least two rollers, and the propeller assembly includes at least two propellers, a rice milling chamber is formed between the rice screen assembly and the roller assembly, and a feed port and a discharge port connected to the interior of the rice milling chamber are respectively provided on the feed bearing seat and the discharge bearing seat.

[0007] In one of the embodiments, the roller assembly includes a rice milling sand roller and a rice milling iron roller, the rice milling sand roller is sleeved at one end close to the feed inlet, and the rice milling iron roller is sleeved at one end close to the discharge outlet.

[0008] In one embodiment, the propeller assembly includes a sand roller propeller and an iron roller propeller. The sand roller propeller is sleeved on one end of the rice milling sand roller away from the rice milling iron roller and extends to the inside of the feed bearing seat. The iron roller propeller is sleeved between the rice milling sand roller and the rice milling iron roller.

[0009] In one embodiment, the rice screen assembly includes a first rice screen and a second rice screen, the first rice screen is arranged on the outside of the rice milling sand roller, and the second rice screen is arranged on the outside of the rice milling iron roller, the screen hole diameter of the first rice screen is larger than the screen hole diameter of the second rice screen, and two independent rice milling chambers are formed between the first rice screen and the rice milling sand roller and between the second rice screen and the rice milling iron roller respectively.

[0010] In one of the embodiments, a discharge spacer ring is provided between the screen frame assembly and the discharge bearing seat.

[0011] In one embodiment, the screen frame assembly includes a first screen segment, a connecting segment and a second screen segment, the first screen segment and the second screen segment are connected by the connecting segment, the first screen segment is arranged on the outside of the first rice screen, the second screen segment is arranged on the outside of the second rice screen, the first screen segment and the second screen segment are both provided with screen holes, the screen hole diameter of the first screen segment is larger than the screen hole diameter of the second screen segment, the connecting segment is arranged on the outside of the iron roller propeller, and a transition chamber is formed between several of the connecting segments and the iron roller propeller.

[0012] In one embodiment, the screen frame assembly is formed by connecting a plurality of screen frames to each other, each of the screen frames is provided with a first screen segment, a connecting segment and a second screen segment, and each of the screen frames is provided with reinforcing ribs.

[0013] In one embodiment, a through hole is provided inside the main shaft, and a plurality of ventilation hole assemblies are provided outside the main shaft around its axis, and each ventilation hole assembly includes ventilation holes distributed on the main shaft along the length direction of the main shaft.

[0014] In one of the embodiments, the feed bearing seat includes a first step and a second step connected to each other, and a first connecting hole and a second connecting hole connected to each other are respectively opened in the first step and the second step, and the diameter of the first connecting hole is larger than the diameter of the second connecting hole. The sand roller propeller is arranged on the inner side of the first connecting hole, and the second connecting hole is provided with a first feed bearing, a spacer sleeve A, a second feed bearing and a spacer sleeve B sleeved on the main shaft in sequence from the end close to the first connecting hole to the end far from the first connecting hole. The spacer sleeve B is sleeved with a feed bearing end cover connected to the end face of the feed bearing seat.

[0015] In one of the embodiments, a bearing sleeve sleeved on the main shaft is provided in the discharge bearing seat, a discharge bearing is sleeved on the bearing sleeve, and a discharge bearing end cover sleeved on the end face of the discharge bearing seat is provided. The discharge bearing end cover sleeved on the main shaft and connected to the end face of the discharge bearing seat.

[0016] The beneficial effects of the present invention are as follows: at least one conveyor is added on the basis of the traditional rice milling mechanism; the sand roller propeller ensures that the brown rice can be smoothly roughened and polished under the action of the rice milling sand roller after passing through the sand roller propeller; the iron roller propeller shells and polishes a small amount of unhusked rice grains mixed in the brown rice, thereby ensuring the rice quality; at the same time, the pressure in the rice milling chamber is increased to remove dust on the surface of the rice that has been polished by the rice milling sand roller, thereby achieving a bright and round effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 For the present invention Figure 1 Schematic diagram of the middle AA direction;

[0019] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0020] Figure 4 for Figure 2 Enlarged view of point B in the middle;

[0021] Figure 5 It is an exploded view of the present invention;

[0022] Figure 6 This is a schematic diagram of the structure of a screen frame of the present invention;

[0023] Figure 7 This is a schematic diagram of the main shaft structure of the present invention;

[0024] Figure 8 It is a schematic diagram of the structure of the feed bearing seat of the present invention.

[0025] In the figure: 1, main shaft; 2, feed bearing seat; 3, discharge bearing seat; 4, driving pulley; 5, rice screen assembly; 6, screen frame assembly; 7, bran discharge chamber; 8, roller assembly; 9, propeller assembly; 10, rice milling chamber; 11, feed port; 12, discharge port; 13, discharge spacer ring; 14, first feed bearing; 15, spacer sleeve A; 16, second feed bearing; 17, spacer sleeve B; 18, feed bearing end cover; 19, bearing bushing; 20, discharge bearing; 21, discharge bearing end cover; 22, iron roller lock nut ; 23. Pulley lock nut; 101. Through hole; 102. Ventilation hole assembly; 1021. Ventilation hole; 201. First step; 202. Second step; 203. First connecting hole; 204. Second connecting hole; 501. First rice screen; 502. Second rice screen; 601. First screen section; 602. Connecting section; 603. Second screen section; 604. Transition chamber; 605. Reinforcement rib; 801. Rice milling sand roller; 802. Rice milling iron roller; 901. Sand roller propeller; 902. Iron roller propeller. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1-Figure 8 As shown, the present invention discloses a refined rice milling mechanism, comprising a main shaft 1, wherein both ends of the main shaft 1 are respectively sleeved with a feed bearing seat 2 and a discharge bearing seat 3, and one end of the main shaft 1 close to the feed bearing seat 2 or the discharge bearing seat 3 is also sleeved with a driving pulley 4, and a rice screen assembly 5 and a screen frame assembly 6 are respectively provided at the outer side of the main shaft 1 between the feed bearing seat 2 and the discharge bearing seat 3, wherein the rice screen assembly 5 is arranged on the inner side of the screen frame assembly 6, and a bran discharge chamber 7 is formed between the rice screen assembly 5 and the screen frame assembly 6, and a roller assembly 8 and a propeller assembly 9 are sleeved at a position between the feed bearing seat 2 and the discharge bearing seat 3 on the main shaft 1, wherein the roller assembly 8 includes at least two rollers, and the propeller assembly 9 includes at least two propellers, and a rice milling chamber 10 is formed between the rice screen assembly 5 and the roller assembly 8, and a feed port 11 and a discharge port 12 communicated with the inside of the rice milling chamber 10 are respectively provided on the feed bearing seat 2 and the discharge bearing seat 3.

[0028] In this embodiment, the roller assembly 8 includes a rice milling sand roller 801 and a rice milling iron roller 802 . The rice milling sand roller 801 is sleeved on one end close to the feed inlet 11 , and the rice milling iron roller 802 is sleeved on one end close to the discharge outlet 12 .

[0029] In this embodiment, the propeller assembly 9 includes a sand roller propeller 901 and an iron roller propeller 902. The sand roller propeller 901 is sleeved on one end of the rice milling sand roller 801 away from the rice milling iron roller 802 and extends to the inside of the feed bearing seat 2. The iron roller propeller 902 is sleeved between the rice milling sand roller 801 and the rice milling iron roller 802.

[0030] In this embodiment, the rice screen assembly 5 includes a first rice screen 501 and a second rice screen 502. The first rice screen 501 is arranged on the outside of the rice milling sand roller 801, and the second rice screen 502 is arranged on the outside of the rice milling iron roller 802. The sieve hole diameter of the first rice screen 501 is larger than the sieve hole diameter of the second rice screen 502. Two independent rice milling chambers 10 are formed between the first rice screen 501 and the rice milling sand roller 801 and between the second rice screen 502 and the rice milling iron roller 802.

[0031] In this embodiment, a discharge spacer ring 13 is provided between the screen frame assembly 6 and the discharge bearing seat 3 .

[0032] In this embodiment, the screen frame assembly 6 includes a first screen segment 601, a connecting segment 602 and a second screen segment 603. The first screen segment 601 and the second screen segment 603 are connected by the connecting segment 602. The first screen segment 601 is arranged on the outside of the first rice sieve 501, and the second screen segment 603 is arranged on the outside of the second rice sieve 502. The first screen segment 601 and the second screen segment 603 are both provided with screen holes. The diameter of the screen holes of the first screen segment 601 is larger than the diameter of the screen holes of the second screen segment 603. The connecting segment 602 is arranged on the outside of the iron roller propeller 902, and a transition chamber 604 is formed between several of the connecting segments 602 and the iron roller propeller 902.

[0033] In this embodiment, the sieve frame assembly 6 is formed by connecting several sieve frames to each other, each of which is provided with a first sieve segment 601 , a connecting segment 602 and a second sieve segment 603 , and each of which is provided with a reinforcing rib 605 .

[0034] In this embodiment, a through hole 101 is provided inside the main shaft 1 , and a plurality of ventilation hole assemblies 102 are provided outside the main shaft 1 around its axis. Each ventilation hole assembly 102 includes ventilation holes 1021 distributed on the main shaft 1 along the length direction of the main shaft 1 .

[0035] In this embodiment, the feed bearing seat 2 includes a first step 201 and a second step 202 connected to each other, and the first step 201 and the second step 202 are respectively provided with a first connecting hole 203 and a second connecting hole 204 connected to each other, the diameter of the first connecting hole 203 is larger than the diameter of the second connecting hole 204, the sand roller propeller 901 is arranged on the inner side of the first connecting hole 203, and the second connecting hole 204 is provided with a first feed bearing 14, a spacer sleeve A15, a second feed bearing 16 and a spacer sleeve B17 sleeved on the main shaft 1 in sequence from the end close to the first connecting hole 203 to the end far away from the first connecting hole 203, and the spacer sleeve B17 is sleeved with a feed bearing end cover 18 connected to the end face of the feed bearing seat 2.

[0036] In this embodiment, the discharge bearing seat 3 is provided with a bearing sleeve 19 which is sleeved on the main shaft 1, and the bearing sleeve 19 is sleeved with a discharge bearing 20. The end face of the discharge bearing seat 3 is provided with a discharge bearing end cover 21 which is sleeved on the main shaft 1 and connected to the end face of the discharge bearing seat 3.

[0037] In the rice milling mechanism, although the disclosed roller assembly 8 and propeller assembly 9 are both two, according to the needs of rice milling, more rollers and propellers can be set on the main shaft to meet the needs of actual use. At the same time, the mechanism is also provided with an iron roller lock nut 22 and a pulley lock nut 23, which are used to lock the rice milling iron roller 802 and the transmission pulley 4 to ensure that the rice milling iron roller 802 and the transmission pulley 4 do not move during the rotation process; at the same time, after the two ends are limited, other components arranged between the two do not need to be limited.

[0038] In this rice milling mechanism, the functions of each component are as follows:

[0039] 1. Spindle 1: Spindle 1 is the main supporting component in the rice milling mechanism. Driven by the transmission pulley 4, it transmits power to other parts of the rice milling mechanism. Through the rotation of the spindle 1, the various components inside the rice milling mechanism work together, thereby completing the milling and processing of brown rice. At the same time, a through hole 101 and a ventilation hole are set on the spindle 1. The setting of the ventilation hole enables a negative pressure strong wind to be formed in the rice milling chamber 10. This negative pressure strong wind helps to keep the brown rice in a suspended state. In this state, the influence of gravity on the brown rice is greatly reduced, making the rice milling process more efficient and uniform; at the same time, the negative pressure strong wind can also fully reduce the rice temperature. The setting of the ventilation hole allows the outside cold air to enter the rice milling chamber 10 and exchange heat with the material, thereby reducing the rice temperature; this negative pressure strong wind can also make the bran discharge more thorough, not easy to block the screening area, and further reduce the broken rice rate.

[0040] 2. Feed bearing seat 2: The feed bearing seat 2 is located at the feed end of the main shaft 1 of the rice milling mechanism. Its main function is to support and fix the first feed bearing 14 and the second feed bearing 16, to ensure that the main shaft 1 can rotate stably and prevent the main shaft 1 from deflecting or shaking during operation, thereby ensuring the stability and accuracy of the rice milling process. At the same time, the feed bearing seat 2 can also provide guidance for the brown rice, so that the brown rice can smoothly enter the interior of the rice milling mechanism for processing.

[0041] 3. Discharge bearing seat 3: The discharge bearing seat 3 is located at the discharge end of the main shaft 1 of the rice milling mechanism, and also plays the role of supporting and fixing the discharge bearing, ensuring the stability of the main shaft 1 during the discharge process and preventing damage caused by vibration or impact. After the rice milling is completed, the material will be discharged from the discharge port 12. At this time, the main shaft 1 will be subjected to the reaction force and friction force from the discharge port 12. The discharge bearing seat 3 can effectively withstand these loads and protect the main shaft 1 and its connecting parts from damage.

[0042] 4. Transmission pulley 4: provides power for main shaft 1.

[0043] 5. Rice sieve assembly 5: comprising a first rice sieve 501 and a second rice sieve 502, which are respectively used in cooperation with the rice milling sand roller 801 and the rice milling iron roller 802 of the roller assembly 8 to complete the polishing and re-whitening of brown rice in the rice milling chamber 10.

[0044] 6. Screen frame assembly 6: used in conjunction with the rice screen assembly 5 to complete the bran discharge in the bran discharge chamber 7; at the same time, the screen frame assembly 6 is configured to be composed of several screen frames connected to each other, which is convenient for disassembly and can facilitate the replacement and maintenance of the rice screen assembly 5.

[0045] 7. Roller assembly 8: includes a rice milling sand roller 801 and a rice milling iron roller 802. The rice milling sand roller 801 cooperates with the first rice sieve 501 to polish the brown rice; the rice milling iron roller 802 cooperates with the second rice sieve 502 to re-polish the brown rice and, at the same time, husk the rice mixed therein to ensure the accuracy of the rice.

[0046] 8. Propeller assembly 9: comprising a sand roller propeller 901 and an iron roller propeller 902; the sand roller propeller 901 ensures that the brown rice can be smoothly roughened and polished under the action of the rice milling sand roller 801 after passing through the sand roller propeller 901; the iron roller propeller 902 has two functions, one is to shell and polish a small amount of unhusked rice mixed in the brown rice, thereby ensuring the rice quality; the other is to increase the pressure of the rice milling chamber 10 during the brown rice conveying process, and remove the dust on the surface of the rice that has been polished by the rice milling sand roller 801, so as to achieve a bright and round effect.

[0047] 9. Discharge spacer ring 13: After the roller assembly 8 and the propeller assembly 9 complete the husking and polishing of a small amount of unhusked rice, the brown rice and the rice husk are separated to ensure that the brown rice and the rice husk can be smoothly separated after rice milling and discharged through different outlets, thereby ensuring the purity of the rice milling product; at the same time, by adjusting the aperture of the discharge spacer ring 13, the accuracy of the milled rice, that is, the smoothness of the rice grain surface and the residual amount of bran powder, can be controlled.

[0048] In the actual process of polishing brown rice, a small amount of rice grains are often mixed in the brown rice. Therefore, when the rice milling mechanism is working, the driving device is used to drive the driving pulley 4 to rotate, thereby driving the main shaft 1 to rotate. Brown rice and rice grains enter the rice milling chamber 10 from the feed port 11, and are pushed between the rice milling sand roller 801 and the first rice screen 501 under the action of the sand roller propeller 901. Polishing is completed under the action of brown rice and brown rice, brown rice and rice milling sand roller 801, and brown rice and the first rice screen 501. After polishing, the polished brown rice and the polished brown rice are conveyed to the rice milling iron roller 802 and the second rice screen 502 with increased pressure through the iron roller propeller 902. Under the action of brown rice and brown rice, brown rice and rice milling iron roller 802, and brown rice and the second rice screen 502, the polished brown rice is polished again, and the rice grains mixed therein are husked to ensure the accuracy of the rice. The polished rice is discharged from the discharge port 12. During the whole process, the rice bran produced enters the bran discharge chamber 7 and is discharged from the bran discharge chamber 7 .

[0049] The above-mentioned embodiments only express the specific implementation of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A refined rice milling mechanism, characterized in that: The invention comprises a main shaft (1), wherein both ends of the main shaft (1) are respectively sleeved with a feed bearing seat (2) and a discharge bearing seat (3), and one end of the main shaft (1) close to the feed bearing seat (2) or the discharge bearing seat (3) is also sleeved with a driving pulley (4), and a rice screen component (5) and a screen frame component (6) are respectively provided at a position between the feed bearing seat (2) and the discharge bearing seat (3) on the outer side of the main shaft (1), and the rice screen component (5) is arranged on the inner side of the screen frame component (6), and a transmission belt (4) is provided between the rice screen component (5) and the screen frame component (6). A bran discharge chamber (7) is formed, a roller assembly (8) and a propeller assembly (9) are sleeved on the main shaft (1) between the feed bearing seat (2) and the discharge bearing seat (3), the roller assembly (8) includes at least two rollers, and the propeller assembly (9) includes at least two propellers, a rice milling chamber (10) is formed between the rice screen assembly (5) and the roller assembly (8), and a feed port (11) and a discharge port (12) communicating with the interior of the rice milling chamber (10) are respectively provided on the feed bearing seat (2) and the discharge bearing seat (3).

2. A refined rice milling mechanism according to claim 1, characterized in that: The roller assembly (8) comprises a rice milling sand roller (801) and a rice milling iron roller (802), wherein the rice milling sand roller (801) is sleeved on one end close to the feed inlet (11), and the rice milling iron roller (802) is sleeved on one end close to the discharge outlet (12).

3. A refined rice milling mechanism according to claim 2, characterized in that: The propeller assembly (9) comprises a sand roller propeller (901) and an iron roller propeller (902); the sand roller propeller (901) is sleeved on one end of the rice milling sand roller (801) away from the rice milling iron roller (802) and extends to the inside of the feed bearing seat (2); and the iron roller propeller (902) is sleeved between the rice milling sand roller (801) and the rice milling iron roller (802).

4. A refined rice milling mechanism according to claim 3, characterized in that: The rice sieve assembly (5) comprises a first rice sieve (501) and a second rice sieve (502); the first rice sieve (501) is arranged outside the rice milling sand roller (801), and the second rice sieve (502) is arranged outside the rice milling iron roller (802); the sieve hole diameter of the first rice sieve (501) is larger than the sieve hole diameter of the second rice sieve (502); two independent rice milling chambers (10) are formed between the first rice sieve (501) and the rice milling sand roller (801) and between the second rice sieve (502) and the rice milling iron roller (802), respectively.

5. The refined rice milling mechanism according to claim 1, characterized in that: A discharge spacer ring (13) is provided between the screen frame assembly (6) and the discharge bearing seat (3).

6. A refined rice milling mechanism according to claim 4, characterized in that: The sieve frame assembly (6) comprises a first sieve segment (601), a connecting segment (602) and a second sieve segment (603); the first sieve segment (601) and the second sieve segment (603) are connected via the connecting segment (602); the first sieve segment (601) is arranged outside the first rice sieve (501); the second sieve segment (603) is arranged outside the second rice sieve (502); both the first sieve segment (601) and the second sieve segment (603) are provided with sieve holes; the diameter of the sieve holes of the first sieve segment (601) is larger than the diameter of the sieve holes of the second sieve segment (603); the connecting segment (602) is arranged outside the iron roller propeller (902); and a transition chamber (604) is formed between a plurality of the connecting segments (602) and the iron roller propeller (902).

7. A refined rice milling mechanism according to claim 6, characterized in that: The sieve frame assembly (6) is formed by connecting a plurality of sieve frames to each other, each of the sieve frames is provided with a first sieve section (601), a connecting section (602) and a second sieve section (603), and each of the sieve frames is provided with a reinforcing rib (605).

8. The refined rice milling mechanism according to claim 7, characterized in that: A through hole (101) is provided inside the main shaft (1), and a plurality of ventilation hole assemblies (102) are provided on the outside of the main shaft (1) around its axis, each group of ventilation hole assemblies (102) comprising ventilation holes (1021) distributed on the main shaft (1) along the length direction of the main shaft (1).

9. A refined rice milling mechanism according to claim 8, characterized in that: The feed bearing seat (2) comprises a first step (201) and a second step (202) connected to each other, wherein a first connecting hole (203) and a second connecting hole (204) connected to each other are respectively formed in the first step (201) and the second step (202), wherein the diameter of the first connecting hole (203) is larger than the diameter of the second connecting hole (204), wherein the sand roller propeller (901) is arranged inside the first connecting hole (203), wherein the second connecting hole (204) is provided with a first feed bearing (14) sleeved on the main shaft (1), a spacer sleeve A (15), a second feed bearing (16) and a spacer sleeve B (17) in sequence from an end close to the first connecting hole (203) to an end far from the first connecting hole (203), wherein the spacer sleeve B (17) is provided with a feed bearing end cover (18) connected to an end surface of the feed bearing seat (2).

10. The refined rice milling mechanism according to claim 8, characterized in that: A bearing sleeve (19) sleeved on the main shaft (1) is arranged inside the discharge bearing seat (3), a discharge bearing (20) is sleeved on the bearing sleeve (19), and a discharge bearing end cover (21) sleeved on the main shaft (1) and connected to the end face of the discharge bearing seat (3) is arranged on the end face of the discharge bearing seat (3).

Images