Rice screening machine and screening cylinder thereof

Abstract

The utility model relates to the technical field of rice screening, and provides a rice screening machine and a screening cylinder thereof, wherein screening holes are not prone to being blocked, and rice enters the screening holes conveniently, so that the screening precision and the screening efficiency are improved. The rice screening machine comprises a machine body, a screening barrel and a cleaning rotating shaft rotationally arranged in the screening barrel. The screening barrel is installed in the machine body, a feeding port is formed in one end of the screening barrel, a discharging port is formed in the other end of the screening barrel, the cleaning rotating shaft is arranged in the screening barrel in the axis direction of the screening barrel, a scraping plate is fixedly arranged on the cleaning rotating shaft, and long-strip-shaped screening holes used for screening shriveled grains are formed in the side face of the screening barrel. And inclined surfaces which are inclined towards the sieve holes so as to guide shriveled grains to enter the sieve holes are arranged on the sieve hole strips on the two sides of the sieve holes.

Description

Technical Field

[0001] The utility model relates to the technical field of rice screening, in particular to a rice screening machine and a screening cylinder thereof. Background Art

[0002] Paddy rice, also known as rice or rice, is an edible grain with a length-to-width ratio of generally more than 1.5 and a long strip shape. During the production and processing of rice, especially during the rice seed selection process, it is necessary to select the rice after the initial selection to screen out the grains that do not meet the requirements for fullness: empty rice. The sieve holes for empty rice screening generally use strip sieve holes with a length and width greater than the empty rice, but a width less than the full rice grain size.

[0003] At present, the commonly used grain screening machines include wind selection equipment and vibration screening machines. Wind selection equipment mainly relies on the floating speed of grains in the air flow for screening, which mainly depends on the weight-to-volume ratio of the material. Its screening accuracy is limited and it is difficult to meet the high requirements of rice seed screening. The vibration screening machine relies on the size of the mesh holes of the screen for screening, and the screening standard is the size of the particles. Because the particle size of the shriveled rice is smaller than the particle size of the full rice, in theory, the screening accuracy of vibration screening is higher than that of wind selection, and it is more suitable for the selection requirements of rice seed screening. However, in practice, the shriveled rice is easily blocked in the mesh holes or difficult to enter the mesh holes, resulting in its screening accuracy being difficult to meet the requirements.

[0004] In order to prevent the sieve holes from being blocked, the Chinese patent application number 202022191178.2 discloses a rice screening machine with a cleaning device, including a machine body, a screening drum and a feed hopper, a cleaning shaft rotatably connected to the machine body is provided in the machine body, the cleaning shaft is connected to a first drive, the screening drum is arranged on the cleaning shaft and rotatably connected to the cleaning shaft, and the screening drum is connected to a second drive, a plurality of cleaning brushes are provided on the cleaning shaft, the plurality of cleaning brushes are arranged in sequence in the axial direction of the cleaning shaft without overlapping, and the projections of the plurality of cleaning brushes along the axial direction of the cleaning shaft are staggered in the circumference, the feed hopper is located at the top of the machine body and connected to the screening drum, a discharge channel is provided in the machine body, the discharge channel includes an impurity channel and a rice channel, the impurity channel is connected to the screening drum and one end extends out of the machine body, and the rice channel is located below the screening drum and one end extends out of the machine body. The screening machine can clean the grains in the screening cylinder by using the cleaning brush on the cleaning shaft to prevent the grains from clogging the sieve holes. It can also stir the grains to make it easier for the shrunken grains to enter the sieve holes and be screened out, thus improving the screening efficiency and accuracy. However, in practice, the rice grains are in a disorderly manner in the screening cylinder. Although the above screening machine can make it easier for the grains to enter the sieve holes by using the cleaning brush, the grains often do not pass through the sieve holes in the direction of the sieve holes, and the shrunken grains are also difficult to enter the sieve holes, which has a great impact on the screening efficiency and screening accuracy. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a rice screening machine and a screening cylinder thereof, the screening holes of which are not easily blocked and the rice can enter the screening holes conveniently, so as to improve the screening accuracy and screening efficiency.

[0006] The utility model adopts the following technical scheme to solve the technical problem: a rice screening machine comprises a machine body, a screening drum and a cleaning shaft rotatably arranged in the screening drum; the screening drum is installed in the machine body, one end of the screening drum is provided with a feeding port, and the other end is provided with a discharging port, the cleaning shaft is arranged in the screening drum along the axial direction of the screening drum, a scraper plate is fixedly arranged on the cleaning shaft, a side surface of the screening drum is provided with a long strip sieve hole for screening shrunken rice, and the sieve bars on both sides of the sieve hole are provided with an inclined surface inclined toward the sieve hole to guide the shrunken rice into the sieve hole.

[0007] Furthermore, the sieve bars on both sides of the sieve hole are V-shaped bars recessed toward the inner side of the screening cylinder, and the outer side surface of the V-shaped bar forms the inclined surface.

[0008] Furthermore, the scraper plate is arranged along the radial direction of the cleaning shaft, and the screen holes are arranged along the circumferential direction of the screening cylinder.

[0009] Furthermore, the scraper plate is a rubber plate.

[0010] Furthermore, the screening cylinder is arranged at an inclination, and the discharge port of the screening cylinder is arranged at the lower end.

[0011] Furthermore, the screening cylinder comprises a sieve hole section and a material flow section, the sieve hole section and the material flow section are connected end to end to enclose the screening cylinder, and the material flow section is arranged at the bottom of the screening cylinder, and the sieve holes are arranged on the sieve hole section.

[0012] Furthermore, it also includes a de-awning mechanism arranged in a de-awning chamber of the machine body, one end of the de-awning chamber is provided with a discharge port, and the other end is provided with a feed port, and the discharge port of the de-awning chamber is connected to the feed port of the screening cylinder.

[0013] Furthermore, the de-awning mechanism includes a de-awning shaft arranged in a de-awning chamber, and the outer periphery of the de-awning shaft is provided with a de-awning plate which is fixedly connected to the de-awning shaft and inclined relative to a plane perpendicular to the de-awning shaft.

[0014] The utility model also provides a screening cylinder of a rice screening machine, wherein the side of the screening cylinder is provided with long strip sieve holes for screening shrunken rice, and the sieve bars on both sides of the sieve holes are provided with inclined surfaces inclined toward the sieve holes to guide the shrunken rice into the sieve holes.

[0015] Furthermore, the sieve bars on both sides of the sieve hole are V-shaped bars recessed toward the inner side of the screening cylinder, and the outer side surface of the V-shaped bar forms the inclined surface.

[0016] Furthermore, the screening cylinder comprises a sieve hole section and a material flow section, the sieve hole section and the material flow section are connected end to end to enclose the screening cylinder, and the material flow section is arranged at the bottom of the screening cylinder, and the sieve holes are arranged on the sieve hole section.

[0017] The beneficial effects of the utility model are as follows: the rice screening machine and screening cylinder thereof of the utility model, since the sieve bars on both sides of the sieve holes are provided with inclined surfaces inclined toward the sieve holes to guide the shrunken rice to enter the sieve holes, when the rice passes through the sieve holes, the inclined surfaces on both sides can make the rice slide into the sieve holes along the inclined surfaces, thereby adjusting the direction of the shrunken rice, making it easier for the shrunken rice to enter the sieve holes, easier to pass through the sieve holes, and the sieve holes are less likely to be blocked, thereby improving the screening accuracy and screening efficiency of the screening machine, and being particularly suitable for selection of rice seeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the rice screening machine of the utility model;

[0019] Figure 2 yes Figure 1 Section view along AA;

[0020] Figure 3 yes Figure 1 A magnified view of point B;

[0021] Figure 4 It is a structural schematic diagram of the de-awning mechanism;

[0022] Figure 5 It is a three-dimensional structural schematic diagram of the de-awning mechanism;

[0023] As shown in the figure: machine body 1, screening cylinder 2, cleaning shaft 3, de-awning mechanism 4, de-awning chamber 11, feed hopper 12, discharge hopper 13, scraper plate 31, sieve hole 21, sieve hole bar 22, sieve hole section 23, flow section 24, de-awning shaft 41, de-awning plate 42, plane 43, inclined surface 221. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] like Figures 1 to 3As shown, the rice screening machine of the utility model comprises a machine body 1, a screening drum 2 and a cleaning shaft 3 rotatably arranged in the screening drum 2. The screening drum 2 is installed in the machine body 1, one end of the screening drum 2 is provided with a feed port, and the other end is provided with a discharge port, which is connected to the discharge hopper 13 on the machine body 1, and the cleaning shaft 3 is arranged in the screening drum 2 along the axial direction of the screening drum 2, and a scraper plate 31 is fixed on the cleaning shaft 3. The screening drum 2 can be fixedly installed on the machine body by bolt connection, welding, etc. The side of the screening drum 2 is provided with a long strip sieve hole 21 for screening the shrunken rice, and the sieve bars 22 on both sides of the sieve hole 21 are provided with an inclined surface 221 inclined to the sieve hole 21 to guide the shrunken rice into the sieve hole 21. The setting direction of the sieve hole 21 can be along the axial direction and circumferential direction of the screening drum, and of course, it can also be equivalent to a certain angle inclined in the axial direction of the screening drum.

[0026] When the rice screening machine of the utility model screens the rice, the cleaning shaft 3 is driven to rotate by a driving device, such as a motor. During the rotation of the cleaning shaft, the scraper plate 31 is driven to rotate together. During the rotation of the scraper plate 31, the rice in the screening cylinder 2 can be stirred, and the rice can be pushed to move circumferentially along the inner side of the screening cylinder 2, so that the shrunken rice in the rice can be screened to avoid blocking the sieve hole. The shrunken rice falls out from the bottom of the screening cylinder 2 through the sieve hole, and the rice that meets the requirements flows out from the discharge port of the screening cylinder 2. In the rice screening machine of the utility model, since the sieve bars 22 on both sides of the sieve hole 21 are provided with inclined surfaces 221 inclined to the sieve hole 21 to guide the shrunken rice to enter the sieve hole 21, when the rice passes through the sieve hole, the rice can slide into the sieve hole along the inclined surfaces 221 under the action of the inclined surfaces on both sides, thereby adjusting the direction of the shrunken rice, making it easier for the shrunken rice to enter the sieve hole, easier to pass through the sieve hole, and the sieve hole is less likely to be blocked, which can improve the screening accuracy and screening efficiency of the screening machine.

[0027] In the utility model, the inclined surface 221 can be a straight surface inclined toward the sieve hole 21, or a curved surface gradually inclined toward the sieve hole 21. In the embodiment of the present invention, in order to facilitate the formation of the inclined surface, the sieve bars 22 on both sides of the sieve hole 21 are V-shaped bars recessed toward the inner side of the screening cylinder 2, and the outer side surface of the V-shaped bar (sieve bar) forms the inclined surface 221. At this time, the inclined surface 221 is a straight surface inclined toward the sieve hole 21. In some embodiments, the sieve bars 22 on both sides of the sieve hole 21 are circular bars, and the outer side surface of the circular bar forms the inclined surface 221. At this time, the inclined surface 221 is an arc-shaped surface gradually inclined toward the sieve hole 21. The specific setting height of the inclined surface 221 is generally greater than the particle size of rice.

[0028] In order to make the force on the cleaning shaft 3 more balanced, the scraper plates 31 are generally two or more. The scraper plates 31 can be set on the cleaning shaft 3 by welding or bolting. The scraper plates 31 can be set along the radial direction of the cleaning shaft 3 (see 2), or can be inclined at a certain angle relative to the radial direction. Of course, the scraper plates 31 can also be set in other ways, such as: the scraper plates 31 are spiral plates around the cleaning shaft 3. In the utility model, the scraper plates 31 are set along the radial direction of the cleaning shaft 3. When the scraper plates 31 are set along the radial direction of the cleaning shaft 3, optimally, the sieve holes 21 are set along the circumferential direction of the screening drum 2. The sieve holes 21 are set along the circumferential direction of the screening drum 2, that is, the length extension direction of the sieve holes 21 is along the circumferential direction of the screening drum 2. When the scraper plate 31 is arranged along the radial direction of the cleaning shaft 3, the sieve hole 21 is arranged along the circumferential direction of the screening cylinder 2. At this time, the setting direction of the sieve hole 21 is exactly the same as the scraping direction of the scraper plate 31. During the rotation of the scraper plate 31, the deflated valleys can be better allowed to enter the sieve holes along the direction of the sieve holes 21, and can be better allowed to enter the sieve holes laterally, which is most beneficial to preventing the sieve holes from being blocked and improving the screening accuracy and screening efficiency of the screening machine.

[0029] The scraper plate 31 can be made of various materials, such as steel plate, plastic plate, rubber plate, etc. In order to prevent the rice from being crushed, the scraper plate 31 is preferably made of rubber plate. The rubber plate is relatively soft and can be adaptively deformed according to the amount of rice in the screening cylinder 2, thereby reducing the pressure on the grains and reducing the damage to the rice.

[0030] The screening drum 2 can generally be arranged horizontally or tilted. In order to facilitate discharging, especially when the scraper plate 31 is arranged along the radial direction of the cleaning shaft 3, it is best that the screening drum 2 is arranged tilted, and the discharging port of the screening drum 2 is arranged at the lower end.

[0031] The entire side of the screening cylinder 2 can be provided with sieve holes, but this is not conducive to the movement of rice in the screening cylinder 2 toward the discharge port. In order to facilitate the movement of the screened rice in the screening cylinder 2, in the utility model, the screening cylinder 2 includes a sieve hole section 23 and a flow section 24, and the sieve hole section 23 and the flow section 24 are connected end to end to enclose the screening cylinder 2, and the flow section 24 is arranged at the bottom of the screening cylinder 2, and the sieve hole 21 is arranged on the sieve hole section 23. In this way, the bottom (sieve hole section) of the screening cylinder 2 is not provided with sieve holes, so that the movement resistance of the rice gathered on the bottom (sieve hole section) is smaller, and it is more convenient for it to move toward the discharge port, which can improve the screening efficiency.

[0032] The rice screening machine of the utility model further comprises a de-awning mechanism 4 arranged in a de-awning chamber 11 of the machine body 1, one end of the de-awning chamber 11 is provided with a discharge port, and the other end is provided with a feed port, and the discharge port of the de-awning chamber 11 is connected with the feed port of the screening cylinder 2. In this way, the rice first enters the de-awning chamber 11, is de-awned by the de-awning mechanism 4, and then enters the screening cylinder 2 for screening, which is also conducive to the deflated rice entering the sieve hole, and is also conducive to preventing the sieve hole from being blocked, and improving the screening accuracy and screening efficiency of the screening machine.

[0033] The de-awning mechanism 4 can adopt various stirring mechanisms that can stir the material. Figure 4 and Figure 5 As shown, in the embodiment of the utility model, the awn-removing mechanism 4 includes a blind-removing shaft 41 disposed in the awn-removing chamber 11, and the outer periphery of the blind-removing shaft 41 is provided with an awn-removing plate 42 fixedly connected to the blind-removing shaft 41 and inclined relative to a plane perpendicular to the blind-removing shaft 41. When removing blinds, the blind-removing shaft 41 is rotated, and the awn-removing plate 42 can be driven to rotate by the blind-removing shaft 41, so that the rice in the awn-removing chamber 11 can be rubbed by the awn-removing plate 42, and the rice in the awn-removing chamber 11 can be removed.

[0034] The blind-removing rotating shaft 41 and the cleaning rotating shaft 3 can be formed by the same rotating shaft, or they can be independently arranged.

[0035] The utility model also provides a screening drum 2 for the above-mentioned screening machine, wherein the side of the screening drum 2 is provided with a long strip sieve hole 21 for screening the shrunken rice, and the sieve holes 22 on both sides of the sieve holes 21 are provided with inclined surfaces 221 inclined toward the sieve holes 21 to guide the shrunken rice into the sieve holes 21. The sieve holes 21 can be arranged along the circumferential direction of the screening drum 2. The sieve holes 22 on both sides of the sieve holes 21 are V-shaped bars recessed toward the inner side of the screening drum 2, and the outer side surface of the V-shaped bars forms the inclined surface 221. In order to facilitate the movement of rice in the screening drum 2, the screening drum 2 includes a sieve hole section 23 and a material flow section 24, and the sieve hole section 23 and the material flow section 24 are connected end to end to enclose the screening drum 2, and the material flow section 24 is arranged at the bottom of the screening drum 2, and the sieve holes 21 are arranged on the sieve hole section 23.

Claims

1. A rice screening machine, comprising a machine body (1), a screening drum (2) and a cleaning shaft (3) rotatably arranged in the screening drum (2); the screening drum (2) is installed in the machine body (1), one end of the screening drum (2) is provided with a feed inlet, and the other end is provided with a discharge outlet, the cleaning shaft (3) is arranged in the screening drum (2) along the axial direction of the screening drum (2), and a scraper plate (31) is fixedly arranged on the cleaning shaft (3), characterized in that: The side of the screening cylinder (2) is provided with a long strip sieve hole (21) for screening the deflated grains, and the sieve bars (22) on both sides of the sieve hole (21) are provided with inclined surfaces (221) inclined toward the sieve hole (21) to guide the deflated grains into the sieve hole (21).

2. The rice screening machine according to claim 1, characterized in that: The sieve bars (22) on both sides of the sieve hole (21) are V-shaped bars recessed toward the inside of the screening cylinder (2), and the outer side surfaces of the V-shaped bars form the inclined surfaces (221).

3. The rice screening machine according to claim 1, characterized in that: The scraper plate (31) is arranged along the radial direction of the cleaning shaft (3), and the screen holes (21) are arranged along the circumferential direction of the screening cylinder (2).

4. The rice screening machine according to claim 1, characterized in that: The scraper plate (31) is a rubber plate.

5. The rice screening machine according to claim 1 or 3, characterized in that: The screening cylinder (2) is arranged at an inclination, and the discharge port of the screening cylinder (2) is arranged at the lower end.

6. The rice screening machine according to claim 5, characterized in that: The screening cylinder (2) comprises a sieve hole section (23) and a flow section (24); the sieve hole section (23) and the flow section (24) are connected end to end to form the screening cylinder (2); the flow section (24) is arranged at the bottom of the screening cylinder (2), and the sieve hole (21) is arranged on the sieve hole section (23).

7. The rice screening machine according to claim 1, characterized in that: It also comprises a de-awning mechanism (4) arranged in a de-awning chamber (11) of the machine body (1), wherein one end of the de-awning chamber (11) is provided with a discharge port, and the other end is provided with a feed port, and the discharge port of the de-awning chamber (11) is connected to the feed port of the screening cylinder (2).

8. The rice screening machine according to claim 7, characterized in that: The de-awning mechanism (4) comprises a de-awning shaft (41) arranged in a de-awning chamber (11), and a de-awning plate (42) is provided on the outer periphery of the de-awning shaft (41) and is fixedly connected to the de-awning shaft (41) and is inclined relative to a plane perpendicular to the de-awning shaft (41).

9. A rice screening machine screening cylinder (2) for a rice screening machine as claimed in any one of claims 1 to 8, characterized in that: The side of the screening cylinder (2) is provided with a long strip sieve hole (21) for screening the deflated grains, and the sieve bars (22) on both sides of the sieve hole (21) are provided with inclined surfaces (221) inclined toward the sieve hole (21) to guide the deflated grains into the sieve hole (21).

10. The rice screening machine screening cylinder (2) according to claim 9, characterized in that: The sieve bars (22) on both sides of the sieve hole (21) are V-shaped bars recessed toward the inside of the screening cylinder (2), and the outer side surfaces of the V-shaped bars form the inclined surfaces (221).

11. The rice screening machine screening cylinder (2) according to claim 9, characterized in that: The screening cylinder (2) comprises a sieve hole section (23) and a flow section (24); the sieve hole section (23) and the flow section (24) are connected end to end to form the screening cylinder (2); the flow section (24) is arranged at the bottom of the screening cylinder (2), and the sieve hole (21) is arranged on the sieve hole section (23).

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