Pre-screening grain screening device
By using the screening cylinder and rubber membrane in the pre-screening device, the problems of damage and jamming caused by slender debris in the vibrating screen are solved, achieving efficient grain screening and improving production efficiency and equipment reliability.
Patent Information
- Application Number
- CN202520126465.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-01-17
AI Technical Summary
Existing vibrating screens are prone to damage or jamming during grain screening due to long and thin debris, which affects production efficiency.
Design a pre-screening device, including a screening bin and a screening cylinder. By rotating the screening cylinder and designing the material passage holes, slender debris is blocked. Combined with structures such as rubber membranes and scrapers, the debris is effectively separated, preventing slender debris from entering the vibrating screen.
It effectively prevents long and thin objects from entering the vibrating screen, reduces equipment damage and jamming, improves screening efficiency, and reduces equipment maintenance requirements.
Smart Images
Figure CN223875476U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of grain processing, in particular to a pre-screening grain screening device. BACKGROUND
[0002] After harvesting, rice, sorghum, millet and other grains need to be processed again, such as threshing, drying, shelling, etc. Because part of the original stems and branches of the crops are mixed in the threshing process, and small branches and other impurities are mixed in the drying process, it is necessary to screen the grain before shelling to remove impurities.
[0003] The most common screening method is to use a vibrating screen for screening. The material is poured from top to bottom on the screen of the vibrating screen, and then transmitted downward along the screen. In this process, the grain smaller than the screen hole of the screen passes through the screen and falls below the screen, thereby separating the impurities.
[0004] In actual production and application, the material needs to be spread on the screen by the vibration of the vibrating screen for screening. If there are slender and hard objects penetrating the screen, it will cause the screen to be pulled and damaged, or even cause the vibrating screen to be stuck. SUMMARY
[0005] To reduce the possibility of damage, sticking and shutdown of the vibrating screen during the screening of grains, a pre-screening grain screening device is provided.
[0006] The above invention purpose of the present application is realized by the following technical scheme:
[0007] A pre-screening grain screening device, comprising a screening bin, a screening cylinder and a driving assembly;
[0008] The bottom of the screening bin is provided with a rectangular discharge port, and the four sides of the discharge port are respectively parallel to the feeding side and the redundant side, and two parallel sealing sides;
[0009] The axis of the screening cylinder is located above the discharge port and parallel to the feeding side. The two ends of the screening cylinder are respectively attached to the wall surfaces of the two sealing sides. The outer peripheral side of the screening cylinder is provided with a material passing hole, and the outer peripheral side of the screening cylinder is attached to the feeding side.
[0010] The driving assembly is in transmission connection with the screening cylinder, and drives the screening cylinder to rotate around its axis in sequence below the discharge port, the feeding side and the redundant side.
[0011] By adopting the above technical scheme, the grain material enters the screening bin from the side of the feeding side relative to the screening cylinder. The grain material flows towards the screening cylinder due to the mutual extrusion of the accumulation or feeding;
[0012] When the grain material contacts the screening cylinder, the grain particles with small size directly fall into the bottom of the screening cylinder after entering the screening cylinder through the material hole, and then the grain flows out from the material hole rotating to the bottom;
[0013] When the elongated impurities contact the screening cylinder, the impurities in the transverse state cannot pass through the screening cylinder and are blocked outside the screening cylinder. The elongated impurities that are perpendicular or tend to be perpendicular to the axis of the screening cylinder are lifted by one end inserted into the material hole due to the rotation of the screening cylinder, and then the elongated impurities are lifted or rotated to the other side of the discharge port by the screening cylinder, thereby avoiding the elongated impurities from passing through the material hole. Thus, the screening and blocking of the elongated impurities in the grain material are achieved, the elongated impurities are prevented from entering the vibrating screen and being stuck on the multi-layer screen of the vibrating screen, and the possibility of damage, jamming and shutdown of the vibrating screen is reduced.
[0014] Optionally, the rubber film is wrapped on the feeding edge, and the redundant edge is attached to the outer circumferential side of the screening cylinder.
[0015] By adopting the above technical solution, on the one hand, the flexibility of the rubber film can reduce the wear of the feeding edge and the outer circumferential side of the screening cylinder, and on the other hand, the outer circumferential side of the screening cylinder is temporarily electrified by the friction between the rubber film and the outer circumferential side of the screening cylinder, which can adsorb silk-like and strip-like impurities such as corn ears and dry rice leaves. The silk-like and strip-like impurities are adsorbed to the other side of the discharge port, separated from the grain, and prevented from hindering the grain from entering the inside of the screening cylinder, thereby improving the screening efficiency.
[0016] Optionally, the screening bin is provided with an impurity discharge port on the side of the screening cylinder away from the feeding edge.
[0017] By adopting the above technical solution, the impurity discharge port is a cleaning port for the screened impurities, which facilitates the transfer of the impurities in the screening bin.
[0018] Optionally, the screening bin is further provided with a scraper, which is parallel and equal in length to the screening cylinder, one side of the scraper is attached to the outer circumferential side of the screening cylinder, and the other side of the scraper is connected to the edge of the impurity discharge port.
[0019] By adopting the above technical solution, the scraper scrapes off the silk-like and strip-like impurities adhered to the screening cylinder or shovels off the elongated impurities hanging on the surface of the screening cylinder, reduces the wear of the redundant edge, and further improves the screening effect.
[0020] Optionally, the scraper is inclined downward from the screening cylinder to the side of the impurity discharge port.
[0021] By adopting the above technical solution, the scraper plays a guiding role in scraping off and shoveling off the impurities, so that the impurities slide and slide out of the discharge port under the action of gravity, reducing the cleaning burden.
[0022] Optionally, it further includes an impurity slide, which is inclined and connected to one side of the impurity discharge port outside the screening bin.
[0023] By adopting the technical scheme, the impurities discharged from the impurity discharge port slide along the impurity slide to a place, are collected centrally, and subsequent processing is facilitated.
[0024] Optionally, a negative pressure air suction pipe is further arranged in the screening bin, and the negative pressure air suction pipe is higher than the screening cylinder and located on the side opposite to the redundant side of the screening cylinder.
[0025] By adopting the technical scheme, dust in the screening bin is sucked, and if the rubber film is used in cooperation, the filamentous and sheet-shaped impurities can be pulled, so that the filamentous and sheet-shaped impurities are more easily peeled off from the screening cylinder, and the screening effect is improved.
[0026] Optionally, a distribution plate is further arranged in the screening bin, the distribution plate is located above the discharge port and horizontally projects to shield the treatment port, and the distribution plate is arranged downwardly and obliquely from the redundant side to the feeding side.
[0027] By adopting the technical scheme, the falling point of the grain material entering the screening bin is guided, direct impact of the grain material on the screening cylinder is avoided, and the grain material is ensured to flow from the feeding side to the screening cylinder, so that the screening effect is improved.
[0028] Optionally, a bridge-breaking gap is arranged on the lower edge of the distribution plate.
[0029] By adopting the technical scheme, for the grain material affected by moisture, the bridge-building phenomenon is prone to occur between the lower edge of the distribution plate and the wall surface of the screening bin, the bridge-breaking gap is arranged to make the grain material unevenly supported at the lower edge of the distribution plate, and the grain material is more easily collapsed, so that the bridge-building phenomenon is reduced, and the production efficiency is improved.
[0030] In summary, the present application has at least the following beneficial effects:
[0031] 1. The screening cylinder with the through holes is arranged at the discharge port of the screening bin, the material flows from the side of the discharge port to the screening cylinder, the grain can enter the screening cylinder and flow out of the screening cylinder through the hole diameter and the direction of rotation of the screening cylinder, and the elongated impurities are blocked outside the screening cylinder, so that the separation of the elongated impurities and the grain is realized;
[0032] 2. The rubber film is arranged to reduce the abrasion of the edge of the discharge port and the screening cylinder, and to separate the sheet-shaped and filamentous impurities, so that the filamentous and strip-shaped impurities are prevented from hindering the grain from entering the inside of the screening cylinder, and the screening efficiency is improved;
[0033] 3. The discharge port, the scraper and the impurity slide are arranged, so that the impurities separated by the screening cylinder automatically flow out of the screening bin under the action of gravity and accumulation, and the need for cleaning in the screening bin is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0034] Figure 1 This is a schematic diagram of the grain screening device in Example 1. Figure 1 ;
[0035] Figure 2 This is a cross-sectional view of the screening chamber in Example 1;
[0036] Figure 3 This is a cross-sectional view of the screening chamber and screening cylinder in Example 1;
[0037] Figure 4 This is a schematic diagram of the grain screening device in Example 1. Figure 2 ;
[0038] Figure 5 for Figure 3 A magnified view of a portion at point A;
[0039] Figure 6 This is a schematic diagram of the grain screening device in Example 2;
[0040] Figure 7 This is a cross-sectional view of the grain screening device in Example 2.
[0041] Reference numerals in the attached diagram: 1. Screening bin; 11. Feed inlet; 12. Discharge outlet; 121. Feeding edge; 1211. Rubber membrane; 122. Sealing edge; 123. Redundant edge; 13. Impurity outlet; 14. Feeding chamber; 15. Screening chamber; 2. Support frame; 3. Impurity chute; 4. Distribution plate; 41. Bridge breaking notch; 5. Screening cylinder; 51. Outer cylinder; 511. Material passage hole; 52. Rotating shaft; 6. Drive assembly; 7. Scraper; 71. Stripping block; 8. Negative pressure suction pipe; 81. Suction hole; 9. Vibrating screen. Detailed Implementation
[0042] The present application will be further described in detail below with reference to the accompanying drawings.
[0043] Example 1
[0044] As attached Figure 1 As shown, a pre-screening grain screening device is installed above a vibrating screen 9, which includes a screening chamber 1, a support 2 for supporting the screening chamber 1, and a debris chute 3 installed on one side of the screening chamber 1.
[0045] The screening chamber 1 is hollow inside, with a feed inlet 11 at its upper end. The feed inlet 11 is connected to the grain conveying pipeline, and the grain material enters the screening chamber 1 through the feed inlet 11.
[0046] As attached Figure 2 As shown, the bottom of the screening chamber 1 has a discharge port 12, which is rectangular. The length of the discharge port 12 is parallel to the length of the bottom surface of the screening chamber 1, and the length of the discharge port 12 is equal to the length of the bottom surface of the screening chamber 1.
[0047] The four edges of the discharge port 12 are parallel feeding edge 121 and redundancy edge 123, two parallel sealing edges 122, and the feeding edge 121 is wrapped with a rubber film 1211.
[0048] The screening bin 1 is provided with a foreign matter outlet 13 on one side wall parallel to and close to the redundancy edge 123, and the length of the foreign matter outlet 13 is equal to the length of the screening bin 1.
[0049] As shown in the accompanying drawings, the screening bin 1 is further provided with a distribution plate 4 and a screening drum 5. Figure 3 As shown in the accompanying drawings, the distribution plate 4 is located directly below the feeding port and directly above the discharge port 12, and the distribution plate 4 is inclined downward from the redundancy edge 123 to the feeding edge 121.
[0050] Figure 2 As shown in the accompanying drawings, the distribution plate 4 is located directly below the feeding port and directly above the discharge port 12, and the distribution plate 4 is inclined downward from the redundancy edge 123 to the feeding edge 121.
[0051] The upper edge of the distribution plate 4 is higher than the foreign matter outlet 13 and is fixedly attached to the wall surface of the screening bin 1 where the foreign matter outlet 13 is located.
[0052] The two sides of the distribution plate 4 are respectively attached to and fixed with the two side walls of the screening bin 1 perpendicular to the foreign matter outlet 13, and the lower edge of the distribution plate 4 is spaced apart from the side surface of the wall surface of the screening bin 1 parallel to the foreign matter outlet 13, so that the distribution plate 4 divides the screening bin 1 into an upper feeding chamber 14 and a lower screening chamber 15.
[0053] The upper edge of the distribution plate 4 is located on the other side of the foreign matter outlet 13 compared with the discharge port 12, so that the horizontal projection of the distribution plate 4 completely covers the discharge port 12.
[0054] When the material enters from the feeding port, it first falls on the distribution plate 4, slides downward along the distribution plate 4 to the bottom of the screening bin 1, and then flows to the discharge port 12 from the side where the feeding edge 121 is located.
[0055] In addition, the lower edge of the distribution plate 4 is also provided with uniformly spaced bridge breaking notches 41, which can be sawtooth-shaped, arc-shaped, etc., so that the lower edge of the distribution plate 4 is not uniformly supported by the grain material, reducing the possibility of arching between the lower edge of the distribution plate 4 and the wall surface of the screening bin 1 for the damp grain material.
[0056] As shown in the accompanying drawings, the screening drum 5 includes a coaxial outer drum 51 and a rotating shaft 52. Figure 2 Figure 3 As shown in the accompanying drawings, the screening drum 5 includes a coaxial outer drum 51 and a rotating shaft 52.
[0057] The axis of the outer cylinder 51 is located above the discharge port 12 and parallel to the feed edge 121. The outer diameter of the outer cylinder 51 is equal to the distance from its axis to the feed edge 121, meaning the outer circumferential side of the outer cylinder 51 is in contact with the feed edge 121. The outer circumferential side of the outer cylinder 51 also has evenly distributed feed holes 511, the diameter of which is larger than the diameter of the grain particles, generally 2 to 4 times the maximum length of the grain particles.
[0058] The outer cylinder 51 is closed at both ends, and the length of the outer cylinder 51 is equal to the length of the feed edge 121. The two ends of the outer cylinder 51 are respectively attached to the wall surface where the two sealing edges 122 are located.
[0059] As attached Figure 3 and attached Figure 4 As shown, the rotating shaft 52 is coaxially fixed with the outer cylinder 51. Both ends of the rotating shaft 52 pass through the outer cylinder 51. One end is rotatably connected to the screening chamber 1, and the other end passes through the outside of the screening chamber 1 and is connected to a drive assembly 6. The drive assembly 6 drives the screening cylinder 5 to rotate around the rotating shaft 52. The drive assembly 6 can be designed according to actual conditions, such as a combination of a motor, belt and pulley. Here, a motor with a reducer is used.
[0060] As attached Figure 3 and attached Figure 5 As shown, the impurity outlet 13 is located inside the screening chamber 1, and a scraper 7 is installed on its lower edge. The length of the scraper 7 is equal to the length of the impurity outlet 13. The scraper 7 is inclined upward from the impurity outlet 13 toward the screening cylinder 5, and the upper edge of the scraper 7 is attached to the wall surface of the screening cylinder 5.
[0061] As attached Figure 4 As shown, the debris chute 3 is attached to the outside of the side wall of the screening chamber 1 where the debris outlet 13 is located. The debris chute is inclined and its upper bottom surface is lower than the debris outlet 13.
[0062] Working principle of Example 1:
[0063] After the grain material is screened in the screening bin 1, it falls to the side where the feed edge 121 is located, and then the grain material flows towards the screening cylinder 5 as it is piled up or squeezed by the feed.
[0064] When the grain material comes into contact with the outer cylinder 51, the grain particle size is small. After entering the outer cylinder 51 through the feed hole 511, it falls directly to the bottom of the outer cylinder 51. Then the grain flows out from the feed hole 511 at the bottom of the rotating cylinder.
[0065] When long and thin objects come into contact with the outer cylinder 51, objects in a horizontal position cannot pass through the outer cylinder 51 and are blocked outside the outer cylinder 51. Long and thin objects that are vertical or tend to be perpendicular to the axis of the outer cylinder 51, even if one end is inserted into the feed tube, the inserted end will be lifted by the rotation of the outer cylinder 51. Then the outer cylinder 51 will lift or rotate and throw the long and thin objects to the other side of the discharge port 12, thereby preventing long and thin objects from passing through the feed hole 511.
[0066] At the same time, the friction of the rubber membrane 1211 against the outer cylinder 51 reduces the static electricity that the outer cylinder 51 generates, and attracts filamentous and ribbon-like debris such as corn ears and dry rice leaves. The filamentous and ribbon-like debris is attracted to the other side of the discharge port 12 and separated from the grain, so as to prevent the filamentous and ribbon-like debris from hindering the grain from entering the inner part of the outer cylinder 51.
[0067] Finally, as the outer cylinder 51 rotates to the side where the redundant edge 123 is located, the debris is quickly scraped off with the assistance of the scraper 7, and slides out of the debris outlet 13 along the scraper 7, falls into the debris chute 3, and slides along the debris chute 3 to a place for collection.
[0068] This achieves efficient screening and blocking of fine, filamentous, and ribbon-like impurities in grain materials, and prevents fine impurities from entering the vibrating screen 9 and getting stuck on its multiple screens, thus reducing the possibility of damage, jamming, or shutdown of the vibrating screen 9.
[0069] Example 2
[0070] As attached Figure 6 As shown, a pre-screening grain screening device, based on Example 1, is further improved and also equipped with a negative pressure suction pipe 8.
[0071] As attached Figure 7 As shown, one end of the negative pressure suction pipe 8 is inserted into the screening chamber 1, and the other end extends through the outside of the screening chamber 1 and is connected to the negative pressure air source, which can be a suction fan or an air pump, etc.
[0072] The negative pressure suction pipe 8 is parallel to the axis of the outer cylinder 51, located between the outer cylinder 51 and the waste outlet 13, and is higher than the outer cylinder 51 and the waste outlet 13. The side of the negative pressure suction pipe 8 has a suction hole 81, and the suction hole 81 faces the axis of the outer cylinder 51.
[0073] Thus, the negative pressure suction pipe 8 can absorb the dust in the screening chamber 1, reduce the dust discharged from the discharge port 13, and pull the filamentous and flaky debris adhering to the outer cylinder 51, making it easier to peel the filamentous and flaky debris off the outer cylinder 51.
[0074] After the improvement in Example 2, filamentous and ribbon-like debris is more easily peeled off from the outer cylinder 51, thus improving the screening effect of filamentous and ribbon-like debris.
[0075] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of protection claimed by the present invention, they are protected by patent law.
Claims
1. A pre-sieving grain screening apparatus, characterized by, The screen bin (1), the screening cylinder (5) and the driving assembly (6) are included. The bottom of the screen bin (1) is provided with a rectangular discharge port (12), and the four sides of the discharge port (12) are respectively parallel to the feeding side (121) and the redundant side (123), and two parallel sealing sides (122). The axis of the screening cylinder (5) is above the discharge port (12) and parallel to the feeding side (121), and the two ends of the screening cylinder (5) are respectively attached to the wall surfaces of the two sealing sides (122), and the outer peripheral side of the screening cylinder (5) is provided with a material passing hole (511), and the outer peripheral side of the screening cylinder (5) is attached to the feeding side (121). The driving assembly (6) is in transmission connection with the screening cylinder (5), and drives the screening cylinder (5) to rotate along the circumference of the feeding side (121), the redundant side (123) and the discharge port (12) in sequence.
2. A pre-sieving grain sizing device according to claim 1, wherein, The feeding side (121) is wrapped with a rubber film (1211), and the redundant side (123) is attached to the outer peripheral side of the screening cylinder (5).
3. A pre-sieving grain sizing device according to claim 1 or 2, characterised in that, The screen bin (1) is provided with a foreign matter outlet (13) on the side away from the feeding side (121) of the screening cylinder (5).
4. A pre-sieving grain sizing device according to claim 3, wherein, The screen bin (1) is further provided with a scraper (7) parallel and equal to the screening cylinder (5), one side of the scraper (7) is attached to the outer peripheral side of the screening cylinder (5), and the other side of the scraper (7) is connected to the edge of the foreign matter outlet (13).
5. A pre-sieving grain sizing device according to claim 4, wherein, The scraper (7) is inclined downward from the screening cylinder (5) to the side of the foreign matter outlet (13).
6. A pre-sieving grain sizing device according to claim 4, wherein, The screen bin (1) is further provided with a foreign matter chute (3) inclined and connected to the side of the foreign matter outlet (13) away from the screen bin (1).
7. A pre- sieved grain sizing device according to claim 1 or 2, wherein, The screen bin (1) is further provided with a negative pressure air suction pipe (8) inside, which is higher than the screening cylinder (5) and located on the side opposite to the screening cylinder (5) of the redundant side (123).
8. A pre-sieving grain sizing device according to claim 1, wherein, The screen bin (1) is further provided with a distribution plate (4) inside, which is located above the discharge port (12) and horizontally projects to shield the processing port, and is inclined downward from the redundant side (123) to the feeding side (121).
9. A pre-sieving grain sizing device according to claim 8, wherein, The lower edge of the distribution plate (4) is provided with a broken bridge notch (41) at intervals.