A method and device for cleaning food raw material particles

Abstract

The present invention discloses a method and a device for cleaning food raw material particles. The raw material particles are first cleaned with circulating water and then cleaned with fresh water. After the fresh water is used to clean the raw material particles, it enters the circulating water, and the circulating water is discharged accordingly according to the entering speed of the fresh water. The cleaning intensity of the first cleaning is greater than that of the second cleaning, so that the defective coatings on the raw material particles are mainly or completely separated during the first cleaning. During the first cleaning, the separated coatings are separated from the circulating water. The present invention has the advantages of small water consumption, low labor intensity of workers, good cleaning effect, low equipment cost, less loss of raw material particles in case of equipment failure, low maintenance cost, and the ability to continuously clean the raw material particles.

Description

Technical Field

[0001] The present invention belongs to the field of cleaning of food raw material particles, and particularly relates to a method and a device for cleaning food raw material particles. Background Art

[0002] Food raw material particles, including the fruits after shelling such as peanuts, cashews, torreya grandis, etc., often have a layer of coating on the surface, and a large amount of dust adhered during shelling is also carried on the outer side of the coating. These dusts are mainly formed by the fragmentation of the fruit shell and contain a small amount of soil, which are inedible and cannot be carried into the next process (the process of removing the coating). Before the next process is carried out, it is necessary to wash them off. Arranging the cleaning process between shelling and coating removal, rather than after coating removal, aims to utilize the water-proof effect of the coating to reduce the loss of nutrients or flavor components in the pulp by dissolving in water and improve the quality of the final product obtained.

[0003] The existing cleaning device is a mixer. The raw material particles are put into a large mixer, and water is added for stirring to remove the adhered dust. Generally, it needs to be washed two to three times, and then dried in the shade or dried according to requirements. Some coatings have thin walls or cracks or defects themselves, resulting in low structural strength. Under the repeated collision of the stirring head of the mixer, they are easily broken. Most of the broken coatings are separated from the raw material particles and enter the cleaning water, increasing the impurity content of the water, which is not conducive to the cleaning work and requires an increase in the amount of cleaning water, and the water consumption is large. After each cleaning is completed, the cleaning water is discharged through the drain valve at the bottom of the mixer. To prevent the raw material particles from being discharged through the drain valve, a filter screen is also provided inside the drain valve. However, the presence of the coating makes the filter screen particularly easy to block. The first reason for the blockage is the accumulation of raw material particles on the filter screen. Although the cleaning water can still pass through the gaps between the raw material particles, it only reduces the drainage speed. However, the coating will fill the gaps between the raw material particles, resulting in the inability of the cleaning water to be discharged. During the drainage process, workers often need to reach into the mixer and pry open the upper layer of raw material particles to dredge the filter screen, and the labor intensity of the workers is large.

[0004] Therefore, cleaning the raw material particles with the existing cleaning device has the disadvantages of large water consumption and high labor intensity of workers. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and a device for cleaning food raw material particles. The present invention has the advantages of small water consumption, low labor intensity of workers, good cleaning effect, low equipment cost, less loss of raw material particles in case of equipment failure, low maintenance cost, and the ability to continuously clean the raw material particles.

[0006] Technical solution of the present invention: A method for cleaning food raw material particles, which uses circulating water to perform the first cleaning on the raw material particles, and uses fresh water to perform the second cleaning on the raw material particles. After the fresh water is used to clean the raw material particles, it enters the circulating water, and the circulating water is discharged correspondingly according to the entry speed of the fresh water.

[0007] In the above-mentioned method for cleaning food raw material particles, the cleaning intensity of the first cleaning is greater than that of the second cleaning, so that the defective coatings on the raw material particles mainly or completely break off during the first cleaning.

[0008] In the above-mentioned method for cleaning food raw material particles, during the first cleaning, the detached coatings are separated from the circulating water.

[0009] A cleaning device for implementing the above-mentioned method for cleaning food raw material particles, including a water tank. A water pump is provided at the bottom of the water tank, an overflow pipe is provided on the side wall of the water tank, a first cleaning mechanism is provided at the upper part of the water tank, a coating separation mechanism is provided at one end of the first cleaning mechanism, a second cleaning mechanism is provided at the other end of the first cleaning mechanism, and the water pump is connected at the junction of the first cleaning mechanism and the second cleaning mechanism.

[0010] In the above-mentioned cleaning device, the first cleaning mechanism includes a first barrel. A feed hopper is provided on the side wall at the upper end of the first barrel. A first screw is provided in the first barrel. The first screw is coaxial with the first barrel. The diameter of the first screw is smaller than the inner diameter of the first barrel. A power mechanism is provided on the first screw. A seal cover that can be opened is provided at the lower end of the first barrel.

[0011] In the above-mentioned cleaning device, the first screw includes a first rotating shaft. Spiral first rib plates are provided on the outer side of the first rotating shaft. Brackets through which the first rotating shaft passes are provided at both ends of the first rib plates. The brackets are fixed to the first barrel.

[0012] In the above-mentioned cleaning device, the second cleaning mechanism includes a vertical second barrel. The lower end of the second barrel is connected to the side wall at the lower end of the second barrel. A second screw is provided in the second barrel. The pitch of the second screw is more than twice the pitch of the first screw. The diameter of the second screw is matched with the inner diameter of the second barrel. The lower end of the second screw extends into the first barrel. The upper end of the second screw extends out of the second barrel. A fresh water outlet is provided above the second screw.

[0013] In the above-mentioned cleaning device, the second screw includes a second rotating shaft. Spiral second rib plates are provided on the second rotating shaft. The lower end of the second rotating shaft passes through the first barrel. A first plain bearing is provided at the end of the second rotating shaft passing through the first barrel. A bearing mounting seat fixed to the first barrel is provided on the first plain bearing.

[0014] In the aforementioned cleaning device, the power mechanism includes a motor fixed to the upper end of the first barrel. A first pulley is provided at the output end of the motor. The first pulley is connected to a second pulley through a first synchronous belt. The second pulley is fixed to a first screw rod. A first bevel gear fixed to the first screw rod is provided outside the second pulley. A horizontally rotating second bevel gear meshes with the lower side of the first bevel gear. A third rotating shaft is provided at the bottom of the second bevel gear. A shaft sleeve is provided on the third rotating shaft. The shaft sleeve is fixed to the first barrel through an adapter plate. A second plain bearing penetrated by the third rotating shaft is provided at the top of the shaft sleeve. A limit pin penetrating the third rotating shaft is provided at the top of the second plain bearing. A third pulley is provided at the lower end of the third rotating shaft. The third pulley is connected to a fourth pulley through a second synchronous belt. The fourth pulley is fixed to the lower end of a second rotating shaft.

[0015] In the aforementioned cleaning device, a pipe joint is provided on the sealing cover. The pipe joint is connected to a water pump through a hose. The sealing cover is screwed to the first barrel. An inclined auger conveyor is provided above the first barrel. The lower end of the auger conveyor is close to the ground. The coating separation mechanism is a wire mesh conveyor. One end of the coating separation mechanism is located below the upper end of the first barrel. The other end of the coating separation mechanism is located outside the water tank. A scraper is provided below the other end of the coating separation mechanism. The upper end of the scraper is attached to the bottom surface of the coating separation mechanism. The lower end of the scraper is connected to the outer side wall of the water tank through a spring.

[0016] Compared with the prior art, the present invention uses circulating water to perform the first cleaning on raw material particles. After completing one cleaning, the separated coatings are promptly separated to avoid or reduce the coatings from entering the circulating water again, so that the impurity content in the circulating water is small and it can be recycled multiple times, greatly reducing the water consumption. The present invention separates the raw material particles from the circulating water through a screw rod, then rinses them clean in fresh water for the second cleaning, and then automatically discharges them to achieve solid-liquid separation. When taking out the raw material particles from the water tank, it is not necessary to drain the water tank, so there will be no situation such as filter screen blockage, eliminating the workload of workers to dredge the filter screen and reducing the labor intensity of workers. In addition, through the optimization of the structure, the present invention also has good cleaning effect on raw material particles, low equipment cost, less loss of raw material particles during equipment failure, low maintenance cost, and realizes continuous cleaning of raw material particles, continuously producing washed raw material particles, facilitating the continuous connection of front and back processes and benefiting the continuous progress of workshop automation production. Therefore, the present invention has the advantages of small water consumption, low labor intensity of workers, good cleaning effect, low equipment cost, less loss of raw material particles during equipment failure, low maintenance cost, and the ability to continuously clean raw material particles. Brief Description of the Drawings

[0017] Figure 1 It is a front view schematic diagram of the cleaning device.

[0018] Figure 2It is the right view of the coating separation mechanism.

[0019] Figure 3 It is a schematic diagram of the distribution of water body in the first cylinder and the second cylinder.

[0020] The reference signs in the drawings are: 1 - water pool, 2 - water pump, 3 - overflow pipe, 4 - first cylinder, 5 - feed hopper, 6 - first screw, 7 - sealing cover, 8 - first rotating shaft, 9 - first rib plate, 10 - bracket, 11 - second cylinder, 12 - second screw, 13 - fresh water outlet, 14 - second rotating shaft, 15 - second rib plate, 16 - first plain bearing, 17 - bearing mounting seat, 18 - motor, 19 - first pulley, 20 - first synchronous belt, 21 - second pulley, 22 - first bevel gear, 23 - second bevel gear, 24 - third rotating shaft, 25 - bushing, 26 - second plain bearing, 27 - limit pin, 28 - third pulley, 29 - fourth pulley, 30 - pipe joint, 31 - hose, 32 - auger conveyor, 33 - coating separation mechanism, 34 - scraper, 35 - spring, 36 - anti - detachment mechanism, 37 - discharge chute, 38 - second synchronous belt. Specific embodiments

[0021] The present invention will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0022] Embodiment. A method for cleaning food raw material particles, which uses circulating water to perform the first cleaning on the raw material particles, and uses fresh water to perform the second cleaning on the raw material particles. The fresh water enters the circulating water after cleaning the raw material particles, and the circulating water is discharged correspondingly according to the entering speed of the fresh water. The cleaning intensity of the first cleaning is greater than that of the second cleaning, so that the defective coatings on the raw material particles are mainly or completely detached during the first cleaning. During the first cleaning, the detached coatings are separated from the circulating water.

[0023] The cleaning device for realizing the above - mentioned cleaning method, as shown in Figure 1 and Figure 2 includes a water pool 1. A drain valve is provided at the bottom of the water pool 1. There is circulating water in the water pool, and the circulating water refers to the cleaning water that is recycled multiple times. A high - flow water pump 2 is provided at the bottom of the water pool 1. An overflow pipe 3 is provided on the side wall of the water pool 1. A first cleaning mechanism is provided at the upper part of the water pool 1. One end of the first cleaning mechanism is provided with a coating separation mechanism 33, and the other end of the first cleaning mechanism is provided with a second cleaning mechanism. A water pump 2 is connected at the junction of the first cleaning mechanism and the second cleaning mechanism.

[0024] The first cleaning mechanism includes a first barrel 4, which is fixed to the upper part of the water tank 1 by a shelf or connecting rod of any shape. An inlet hopper 5 is provided on the side wall at the upper end of the first barrel 4. A first screw 6 is arranged inside the first barrel 4. The first screw 6 is coaxial with the first barrel 4. The diameter of the first screw 6 is smaller than the inner diameter of the first barrel 4. A gap that can be passed through by the coating is formed between the first screw 6 and the first barrel 4. A power mechanism is provided on the first screw 6. A seal cover 7 that can be opened is provided at the lower end of the first barrel 4. When all the raw material particles are cleaned, a small amount of raw material particles will remain at the lower end of the first barrel 4. At this time, after opening the seal cover 7, this part of the raw material particles can be taken out to prevent this part of the raw material particles from rotting in the first barrel 4 and contaminating the raw material particles of the next batch.

[0025] The first screw 6 includes a first rotating shaft 8. A spiral first rib plate 9 is arranged on the outer side of the first rotating shaft 8. Brackets 10 through which the first rotating shaft 8 passes are provided at both ends of the first rib plate 9. The brackets 10 are fixed to the first barrel 4.

[0026] The second cleaning mechanism includes a vertical second barrel 11. The inner diameter of the second barrel 11 is the same as that of the first barrel 4. The lower end of the second barrel 11 is connected to the side wall at the lower end of the second barrel 11. A second screw 12 is arranged inside the second barrel 11. The pitch of the second screw 12 is more than 2 times that of the first screw 6, and 2 times, 2.5 times, or 3 times are all acceptable. The diameter of the second screw 12 is matched with the inner diameter of the second barrel 11. The lower end of the second screw 12 extends into the first barrel 4, and the upper end of the second screw 12 extends out of the second barrel 11. A fresh water outlet 13 is provided above the second screw 12. The fresh water outlet 13 is at the water outlet of a water pipe, and the water pipe can be connected to tap water. A water pump is installed when the water pressure of the tap water is insufficient. The tap water is the fresh water. Since the pitch of the second screw 12 is smaller than that of the first screw 6, at the same rotation speed, the agitation of the second screw 12 for the raw material particles is more intense. The defective coatings on the raw material particles basically fall off when passing through the first screw 6, and there will be basically no new coatings coming off when entering the range of the second screw 12. The amount of residual and independent fragment coatings on the washed raw material particles is less, and the washing effect is better. It is reflected in that the washed raw material particles need to be dried before the coating removal process. If the dried raw material particles contain a large amount of fragment coatings, they will be very easy to be lifted up and pollute the workshop environment.

[0027] A spiral discharge chute 37 is provided at the upper end of the second barrel 11. The wrap angle of the discharge chute 37 is more than 360°. The cross-section of the discharge chute 37 is U-shaped, and a water leakage hole is provided at the bottom of the discharge chute 37. The discharge chute 37 is used to collect the raw material particles discharged from the second barrel 11 and further achieve solid-liquid separation.

[0028] The second screw 12 includes a second rotating shaft 14. A spiral second rib plate 15 is provided on the second rotating shaft 14. The lower end of the second rotating shaft 14 passes through the first barrel 4. At the end where the second rotating shaft 14 passes through the first barrel 4, a first plain bearing 16 is provided. Above the first plain bearing 16, an anti - detachment mechanism 36 connected to the second rotating shaft 14 is provided. The anti - detachment structure can be a bump, a convex ring or a pin passing through the second rotating shaft 14, aiming to prevent the second screw 12 from falling under the action of gravity. A bearing mounting seat 17 fixed to the first barrel 4 is provided on the first plain bearing 16.

[0029] The power mechanism includes a motor 18 fixed to the upper end of the first barrel 4. A first pulley 19 is provided at the output end of the motor 18. The first pulley 19 is connected to a second pulley 21 through a first synchronous belt 20. The second pulley 21 is fixed to the first screw 6. A first bevel gear 22 fixed to the first screw 6 is provided outside the second pulley 21. A horizontally rotating second bevel gear 23 is meshed below the first bevel gear 22. A third rotating shaft 24 is provided at the bottom of the second bevel gear 23. A bushing 25 is provided on the third rotating shaft 24. The bushing 25 is fixed to the first barrel 4 through an adapter plate. A second plain bearing 26 through which the third rotating shaft 24 passes is provided at the top of the bushing 25. The second plain bearing is used to reduce the resistance when the third rotating shaft 24 rotates. A limit pin 27 passing through the third rotating shaft 24 is provided at the top of the second plain bearing 26. The limit pin 27 is used to prevent the third rotating shaft 24 from falling. A third pulley 28 is provided at the lower end of the third rotating shaft 24. The third pulley 28 is connected to a fourth pulley 29 through a second synchronous belt 38. The fourth pulley 29 is fixed to the lower end of the second rotating shaft 14. The power mechanism drives the first screw 6 and the second screw 12 simultaneously. First, it can reduce the number of motors and the equipment cost. Second, it enables the first screw 6 and the second screw 12 to achieve linkage, ensuring that the feeding speed of the first screw 6 and the discharging speed of the second screw 12 remain stable and consistent, reducing raw material particle loss and equipment maintenance cost. If the first screw 6 and the second screw 12 are each driven by an independent motor, the following situations will occur: when the motor on the first screw 6 is damaged, the raw material particles gather at the lower end of the first barrel 4 and cannot be discharged. All the raw material particles in the first barrel 4 will be crushed, resulting in raw material particle loss. Moreover, the second screw 12 is continuously affected by a large radial force and is prone to deformation, and the replacement and maintenance cost is high.

[0030] A pipe joint 30 is provided on the sealing cover 7. The pipe joint 30 is connected to a water pump 2 through a hose 31, and the sealing cover 7 is screwed to the first barrel 4. An inclined auger conveyor 32 is provided above the first barrel 4. The auger conveyor 32 is connected to the ground through a rack. The feeding end of the auger conveyor 32 is close to the ground for easy feeding. The coating separation mechanism 33 is a wire mesh conveyor. The mesh size on the wire mesh conveyor needs to ensure that the coating is difficult to pass through and can intercept most of the coating. One end of the coating separation mechanism 33 is located below the upper end of the first barrel 4, and the other end of the coating separation mechanism 33 is located outside the water tank 1. A scraper 34 is provided below the other end of the coating separation mechanism 33. The upper end of the scraper 34 is in contact with the bottom surface of the coating separation mechanism 33, and the lower end of the scraper 34 is connected to the outer wall of the water tank 1 through a spring 35. The function of the spring 35 is to keep the scraper 34 in flexible connection with the wire mesh on the wire mesh conveyor, prevent the scraper 34 from being jammed by the uneven wire mesh so that the wire mesh conveyor cannot work, and when the uneven wire mesh passes through the scraper 34, the scraper 34 vibrates continuously, knocking on the wire mesh and further promoting the coating on the wire mesh to fall off.

[0031] By selecting appropriate speed ratios of the first bevel gear 22 and the second bevel gear 23, and the speed ratios of the third pulley 28 and the fourth pulley, the rotation speeds of the first screw 6 and the second screw 12 are made equal.

[0032] Working principle: For example, when cleaning shelled and skinned peanut grains, at this time, the gap between the first screw 6 and the first barrel 4 is required to be smaller than the diameter of the peanut grains.

[0033] Start the water pump, and the water in the water tank 1 enters the lower end of the first barrel 4 through the hose 31 and the pipe joint 30, is discharged from the upper end of the first barrel 4, and returns to the water tank for continuous circulation.

[0034] Start the motor 18. The motor 18 drives the first pulley 19 to rotate. The first pulley 19 drives the second pulley 21 to rotate through the first synchronous belt 20. The second pulley 21 drives the first screw 6 to rotate. The first screw 6 drives the second bevel gear 23 to rotate through the first bevel gear 22. The second bevel gear 23 drives the third pulley 28 to rotate through the third rotating shaft 24. The third pulley 28 drives the fourth pulley 29 to rotate through the second synchronous belt 38. The fourth pulley 29 drives the second screw 12 to rotate.

[0035] Start the screw conveyor 32, and continuously convey the peanut granules to the feed hopper 5 by the peanut granule screw conveyor 32. The peanut granules fall into the first barrel 4 and move downward under the action of the first screw 6. During the movement, the first screw 6 agitates the peanut granules to conduct the first cleaning of the peanut granules. The dust washed off and the falling coating mainly pass through the gap between the first screw 6 and the first barrel 4 under the drive of the water flow and are discharged from the upper end of the first barrel 4. The coating falls on the coating separation mechanism 33 and is conveyed outside the water tank 1. Most of the coating falls at the outer end of the coating separation mechanism 33, and a small part of the residue is scraped off by the scraper 34. The peanut granules entering below the second barrel 11 move upward under the drive of the second screw 12. When the peanut granules move to the upper part of the second barrel 11, that is, when the height of the peanut granules is slightly higher than the height of the upper end of the first barrel 4, the peanut granules come into contact with clean tap water for the second cleaning, and then are discharged from the upper end of the second barrel 11 and fall into the discharge chute 37 and slide downward. Place a container below the lower end of the discharge chute 37 to receive the fallen and washed peanut granules. When the peanut granules slide in the discharge chute 37, the remaining water droplets are discharged through the water leakage holes and return to the water tank 1.

[0036] Since there is a continuous supply of tap water at the fresh water outlet 13 to the water tank 1, when the liquid level of the water tank 1 is higher than the overflow pipe 3, the circulating water in the water tank overflows from the overflow pipe 3 and takes away part of the stains, so that the impurity concentration of the circulating water in the water tank 1 is continuously maintained at a relatively low level to achieve balance, enabling the raw material granules to be cleaned relatively cleanly during the first cleaning, that is, in the first barrel 4, thereby improving the cleaning effect.

[0037] As Figure 3 shown, the diagonal area B with the lower end to the right is filled with circulating water formed by the water pump pressure, and the diagonal area A with the lower end to the left is filled with fresh water from the fresh water outlet 13, that is, clean tap water. The fresh water in area A enters area B under the action of gravity and becomes circulating water. The peanut granules are first cleaned in area B and second cleaned in area A.

Claims

1. A method for cleaning food raw material particles, characterized in that: The raw material particles are first cleaned with circulating water and then cleaned with fresh water. After the fresh water is used to clean the raw material particles, it enters the circulating water, and the circulating water is discharged accordingly according to the inlet speed of the fresh water; A cleaning device for implementing the food raw material particle cleaning method, comprising a water tank (1), a water pump (2) is provided at the bottom of the water tank (1), an overflow pipe (3) is provided on the side wall of the water tank (1), a first cleaning mechanism is provided at the upper part of the water tank (1), a coating separation mechanism (33) is provided at one end of the first cleaning mechanism, a second cleaning mechanism is provided at the other end of the first cleaning mechanism, and a water pump (2) is connected at the junction of the first cleaning mechanism and the second cleaning mechanism; The first cleaning mechanism includes a first barrel (4), a feed hopper (5) is provided on the side wall at the upper end of the first barrel (4), a first screw (6) is provided in the first barrel (4), the first screw (6) is coaxial with the first barrel (4), the diameter of the first screw (6) is smaller than the inner diameter of the first barrel (4), a power mechanism is provided on the first screw (6), and a seal cover (7) that can be opened is provided at the lower end of the first barrel (4); The second cleaning mechanism includes a vertical second barrel (11), the lower end of the second barrel (11) is connected to the side wall at the lower end of the first barrel (4), a second screw (12) is provided in the second barrel (11), the pitch of the second screw (12) is more than twice the pitch of the first screw (6), the diameter of the second screw (12) is matched with the inner diameter of the second barrel (11), the lower end of the second screw (12) extends into the first barrel (4), the upper end of the second screw (12) extends out of the second barrel (11), and a fresh water outlet (13) is provided above the second screw (12); A spiral discharge chute (37) is provided at the upper end of the second barrel (11), the wrap angle of the discharge chute (37) is more than 360°, the cross section of the discharge chute (37) is U-shaped, and a water leakage hole is provided at the bottom of the discharge chute (37); The raw material particles to be cleaned enter the hopper (5) from the auger conveyor (32), and the cleaned raw material particles are discharged from the discharge chute (37); A pipe joint (30) is provided on the seal cover (7), the pipe joint (30) is connected to the water pump (2) through a hose (31), and the seal cover (7) is screwed to the first barrel (4); An inclined auger conveyor (32) is provided above the first barrel (4), and the lower end of the auger conveyor (32) is close to the ground; The coating separation mechanism (33) is a wire mesh conveyor, one end of the coating separation mechanism (33) is located below the upper end of the first barrel (4), the other end of the coating separation mechanism (33) is located outside the water tank (1), and a scraper (34) is provided below the other end of the coating separation mechanism (33), the upper end of the scraper (34) is in contact with the bottom surface of the coating separation mechanism (33), and the lower end of the scraper (34) is connected to the outer side wall of the water tank (1) through a spring (35); The raw material particles are skinned peanuts.

2. The method for cleaning food raw material particles according to claim 1, characterized in that: The cleaning intensity of the first cleaning is greater than that of the second cleaning, so that the defective coating on the raw material particles mainly or completely detaches during the first cleaning.

3. The method for cleaning food raw material particles according to claim 2, characterized in that: During the first cleaning, the detached coating is separated from the circulating water.

4. The method for cleaning food raw material particles according to claim 1, characterized in that: The first screw (6) includes a first rotating shaft (8). A spiral first rib plate (9) is provided on the outer side of the first rotating shaft (8). Brackets (10) through which the first rotating shaft (8) passes are provided at both ends of the first rib plate (9). The brackets (10) are fixed to the first barrel (4).

5. The method for cleaning food raw material particles according to claim 1, characterized in that: The second screw (12) includes a second rotating shaft (14). A spiral second rib plate (15) is provided on the second rotating shaft (14). The lower end of the second rotating shaft (14) passes through the first barrel (4). A first plain bearing (16) is provided at the end of the second rotating shaft (14) passing through the first barrel (4). A bearing mounting seat (17) fixed to the first barrel (4) is provided on the first plain bearing (16).

6. The method for cleaning food raw material particles according to claim 5, characterized in that: The power mechanism includes a motor (18) fixed to the upper end of the first barrel (4). A first pulley (19) is provided at the output end of the motor (18). The first pulley (19) is connected to a second pulley (21) through a first synchronous belt (20). The second pulley (21) is fixed to the first screw (6). A first bevel gear (22) fixed to the first screw (6) is provided on the outer side of the second pulley (21). A horizontally rotating second bevel gear (23) is engaged with the lower side of the first bevel gear (22). A third rotating shaft (24) is provided at the bottom of the second bevel gear (23). A bushing (25) is provided on the third rotating shaft (24). The bushing (25) is fixed to the first barrel (4) through an adapter plate. A second plain bearing (26) through which the third rotating shaft (24) passes is provided at the top of the bushing (25). A limit pin (27) passing through the third rotating shaft (24) is provided at the top of the second plain bearing (26). A third pulley (28) is provided at the lower end of the third rotating shaft (24). The third pulley (28) is connected to a fourth pulley (29) through a second synchronous belt (38). The fourth pulley (29) is fixed to the lower end of the second rotating shaft (14).

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