Grain impurity removal screening machine
By using an elastic screen plate, an adjustable conveying speed intermediate conveying trough, and an adaptive blocking structure, the problems of impurity clogging, non-adjustable speed, and splashing in existing grain screening machines have been solved, achieving efficient and stable grain screening.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-27
- Publication Date
- 2026-04-03
AI Technical Summary
Existing grain screening machines suffer from problems such as impurities clogging filter holes, non-adjustable screening speed, easy grain splashing and overflow, difficulty in cleaning impurities, and unstable structure.
It adopts an elastic screen plate, an adjustable conveying speed intermediate conveying trough, an arc-shaped guide trough, and an adaptive blocking structure, combined with a plug rod to clean impurities, to achieve the reciprocating movement of the screen plate and effective screening of grains.
It effectively avoids impurity blockage, flexibly controls screening speed, prevents grain splashing and spillage, improves screening efficiency and quality, and ensures stable equipment operation.
Smart Images
Figure CN224072615U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of grain screening technology, specifically to a grain impurity removal screening machine. Background Technology
[0002] In the grain processing industry, grain screening and impurity removal is a crucial step in ensuring grain quality. However, existing grain screening machines suffer from several problems. First, after prolonged use, impurities easily clog the filter holes of many traditional screening machines, leading to reduced screening efficiency or even malfunction. Second, these machines often cannot flexibly adjust the screening speed according to the characteristics or screening requirements of different grains, making it difficult to achieve optimal screening results. Furthermore, during grain conveying and screening, grain is easily splashed out of the screen area due to collisions or overflows from the side plates, resulting in grain waste. Simultaneously, cleaning impurities stuck in the filter holes is usually difficult, requiring manual cleaning after machine shutdown, impacting production efficiency. Moreover, some screening machines suffer from poor structural design and poor inter-component linkage, resulting in insufficient stability during operation and further affecting screening performance.
[0003] Therefore, developing a grain impurity removal and screening machine that can effectively solve the problem of impurity blockage, has an adjustable screening speed, prevents grain splashing and side overflow, facilitates impurity cleaning, and operates stably is of great practical significance. Summary of the Invention
[0004] In response to the above-mentioned technical problems, this application solves the problems of impurities clogging the screen plate, insufficient screening speed control, and easy splashing in the prior art.
[0005] To achieve the above objectives, the technical solution adopted in this application is as follows: a grain impurity removal and screening machine, comprising a machine body, an outer support frame slidably disposed on the machine body, a sieve plate fixedly installed on the outer support frame, the sieve plate being elastic, a limit plate fixedly disposed on the outer support frame, an inner support frame slidably disposed on the limit plate, a vertical slide rod of the inner support frame sliding vertically on the inner support frame, a base plate fixedly installed on the vertical slide rod of the inner support frame, a plurality of insert rods fixedly disposed on the base plate, each insert rod corresponding to a filter hole on the sieve plate, a guide groove fixedly disposed on the machine body, an intermediate conveying groove fixedly disposed on the guide groove, a feed trough fixedly disposed on the intermediate conveying groove, and a pull rod slidably disposed on the intermediate conveying groove for controlling the conveying speed of the material in the intermediate conveying groove.
[0006] Preferably, a plurality of guide blocks are fixedly provided on the intermediate conveying trough, and two symmetrically arranged inclined surfaces are provided on the guide blocks, with the high points of the inclined surfaces contacting each other.
[0007] Preferably, multiple baffles are fixedly installed on the pull rod, and the baffles and guide blocks are arranged alternately. A stirring rod is fixedly installed on the baffle.
[0008] Preferably, a guide plate is fixedly provided on the guide groove, and the guide plate has an arc-shaped structure.
[0009] Preferably, a rear rotating shaft is fixedly installed on the machine body, an upper side plate is rotatably installed on the rear rotating shaft, the upper side plate is in contact with the screen plate, a front sliding shaft is fixedly installed at the end of the upper side plate away from the rear rotating shaft, and a front sliding groove is fixedly installed at the end of the machine body near the front sliding shaft, and the front sliding shaft slides on the front sliding groove.
[0010] Preferably, a motor is fixedly installed on the machine body, a rotating wheel is fixedly connected to the output end of the motor, a drive rod is rotatably connected to the rotating wheel, and a push-pull plate is fixedly installed on the outer support frame, the push-pull plate being rotatably connected to the drive rod.
[0011] Preferably, the inner support frame is provided with a crossbeam, on which multiple connecting shafts are rotatably connected, and push rods are rotatably connected to the connecting shafts. The end of the push rod away from the connecting shaft is rotatably mounted on the machine body.
[0012] The technical solution provided in this application has the following advantages compared with the prior art:
[0013] 1. This application uses an elastic sieve plate, such as a polyurethane sieve plate. Utilizing its high strength, high elasticity, wear resistance, and chemical corrosion resistance, the filter holes of the sieve plate deform elastically during reciprocating movement, allowing trapped impurities to fall off smoothly, effectively preventing clogging and ensuring efficient grain screening. Simultaneously, the reciprocating movement of the sieve plate, combined with grain movement, enables more comprehensive grain screening, improving screening quality.
[0014] 2. This application, by setting a tie rod and corresponding baffles and guide blocks on the intermediate conveying trough, can flexibly control the conveying speed of grains within the trough, thereby coordinating with the reciprocating movement of the sieve plate to achieve different screening effects and efficiencies, meeting diverse screening needs. For example, for grains with different impurity contents or different varieties, the screening speed can be adjusted to achieve the best screening effect.
[0015] 3. The arc-shaped guide plate on the guide trough of this application effectively prevents grain from flying out of the screen plate range due to collision and ejection when it falls from the middle conveying trough into the guide trough, thereby reducing grain waste and improving grain utilization.
[0016] 4. The upper side plate of this application is connected to the machine body through the rear rotating shaft and the front sliding shaft. It can rotate adaptively with the reciprocating movement of the sieve plate, effectively blocking the grains on the sieve plate and preventing the grains from overflowing from the side plate, thus further ensuring the integrity of the grains and the screening efficiency during the screening process.
[0017] 5. The structure consisting of the inner support frame, push rod, and insert rod of this application, when the sieve plate moves back and forth, drives the inner support frame to move through the outer support frame, thereby causing the insert rod to be inserted into the filter holes of the sieve plate, pushing the stuck impurities out, further ensuring that the filter holes of the sieve plate are not blocked, and maintaining the continuous and efficient screening. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of this application;
[0019] Figure 2 This is a cross-sectional view of the guide groove in this application;
[0020] Figure 3 This is a schematic diagram of the structure of the boot block in this application;
[0021] Figure 4 This is a structural schematic diagram of the upper side panel of this application;
[0022] Figure 5 This is a schematic diagram of the internal support frame of this application;
[0023] Figure 6 This is a schematic diagram of the push rod structure of this application;
[0024] In the diagram: 101-Machine body; 102-Guide groove; 103-Guide plate; 104-Intermediate conveying groove; 105-Feeding groove; 106-Pull rod; 107-Guide block; 108-Baffle; 109-Agitator rod; 110-Motor; 111-Roller; 112-Drive rod; 113-Push-pull plate; 114-Outer support frame; 115-Screen plate; 116-Upper side plate; 117-Rear rotating shaft; 118-Front sliding shaft; 119-Front sliding groove; 120-Limiting plate; 121-Inner support frame; 122-Bottom plate; 123-Insertion rod; 124-Lower side plate; 125-Connecting shaft; 126-Push rod. Detailed Implementation
[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0026] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0027] like Figures 1 to 6 As shown, a grain impurity removal and screening machine includes a body 101. An outer support frame 114 is slidably mounted on the body 101. A sieve plate 115 is fixedly mounted on the outer support frame 114. The sieve plate 115 is elastic. A limit plate 120 is fixedly mounted on the outer support frame 114. An inner support frame 121 is slidably mounted on the limit plate 120. A vertical slide rod of the inner support frame 121 slides vertically on the inner support frame 121. A base plate 122 is fixedly mounted on the vertical slide rod of the inner support frame 121. A plurality of insert rods 123 are fixedly mounted on the base plate 122. Each insert rod 123 corresponds to a filter hole on the sieve plate 115. A guide groove 102 is fixedly mounted on the body 101. An intermediate conveying groove 104 is fixedly mounted on the guide groove 102. A feed trough 105 is fixedly mounted on the intermediate conveying groove 104. A pull rod 106 for controlling the conveying speed of the intermediate conveying groove 104 is slidably mounted on the intermediate conveying groove 104.
[0028] Specifically, the limiting plate 120 and the screen plate 115 are provided with inclined plates for material discharge at the ends away from the guide groove 102. The limiting plate 120 is provided with lower side plates 124 for preventing material from sliding out from the side. There are three lower side plates 124, which are located on the two sides near the two upper side plates 116 and on the side near the guide groove 102, respectively.
[0029] In use, grains are placed into the feed trough 105. The grains slide down the inclined surface of the feed trough 105 by gravity and fall onto the guide trough 102 through the intermediate conveying trough 104. Then, they are moved onto the screen plate 115 through the inclined angle of the guide trough 102. Finally, the reciprocating movement of the screen plate 115 achieves the screening of the grains. Fine impurities and broken residues in the grains fall down to the lower limit plate 120 through the filter holes of the screen plate 115.
[0030] The sieve plate 115 is an elastic element with a certain degree of elasticity, and is preferably a polyurethane sieve plate. This polyurethane sieve plate has advantages such as high strength, high elasticity, good wear resistance, and resistance to chemical corrosion. Its elastic modulus can be adjusted according to different formulations to meet different screening requirements. Polyurethane elastomers also have good tear resistance, and in grain screening applications, they are not easily damaged under long-term vibration and impurity friction.
[0031] During screening, larger impurities may get stuck in the filter holes of the sieve plate 115. When the sieve plate 115 moves back and forth, the filter holes of the sieve plate 115 will change due to the elasticity of the material, so that the stuck impurities can be released and fall smoothly, thus avoiding the problem of too many impurities getting stuck and affecting the normal screening of grains during long-term operation.
[0032] As the grains fall from the intermediate conveyor 104 into the guide trough 102 and then into the sieve plate 115, the conveying speed of the intermediate conveyor 104 is controlled by the pull rod 106 that slides on the intermediate conveyor 104. This, in turn, coordinates with the reciprocating movement of the sieve plate 115 to control the grain screening speed, thereby achieving different screening effects and efficiencies.
[0033] like Figure 3 As shown, a plurality of guide blocks 107 are fixedly installed on the intermediate conveying trough 104. Each guide block 107 has two symmetrically arranged inclined surfaces, with the highest points of the inclined surfaces contacting each other. Specifically, the plurality of guide blocks 107 are spaced apart within the intermediate conveying trough 104, and the gap between two adjacent guide blocks 107 is less than the length of the baffle 108. The two inclined surfaces of the guide blocks 107 slope from the middle to both sides, thereby guiding the grain above to slide down and preventing the guide blocks 107 from obstructing the grain.
[0034] like Figure 3 As shown, multiple baffles 108 are fixedly installed on the pull rod 106. The baffles 108 and the guide block 107 are arranged alternately. A stirring rod 109 is fixedly installed on the baffle 108.
[0035] Specifically, the gap between the two guide blocks 107 is blocked by the baffle 108. When the operator controls the lever 106 to slide on the intermediate conveying trough 104, the lever 106 drives the baffle 108 to slide on the intermediate conveying trough 104, so that the baffle 108 moves below the guide block 107. Part of the baffle 108 gradually overlaps with the guide block 107, and then the baffle 108 gradually loses its ability to block the gap between the two guide blocks 107. As a result, the channel formed by the two guide blocks 107 and the baffle 108 gradually increases as the baffle 108 moves, until the baffle 108 moves completely below the guide block 107. At this time, the flow speed of the grain in the intermediate conveying trough 104 is the maximum. The conveying speed of the grain is controlled in this way.
[0036] When the grains in the intermediate conveying trough 104 are at the guide block 107 in the intermediate conveying trough 104, the grains are most likely to form blockages due to mutual compression, resulting in suspension and inability to continue to be conveyed downwards. At this time, the operator can clearly see the reduction in the grain conveying speed. The operator can then control the lever 106 to move back and forth significantly. The lever 106 drives the stirring rod 109 to stir the grains through the baffle 108, thereby breaking up the connection between the grains and allowing them to continue to be conveyed.
[0037] like Figure 2 As shown, a guide plate 103 is fixedly installed on the guide groove 102, and the guide plate 103 has an arc-shaped structure.
[0038] Specifically, when grains fall from the intermediate conveyor trough 104 onto the guide trough 102, because the grains fall at a relatively high speed, they collide upon landing on the guide trough 102, causing them to bounce in all directions and scatter. This may result in the grains flying out of the sieve plate 115, causing waste. Therefore, by setting an arc-shaped guide plate 103 on the guide trough 102, the grains first contact the concave arc surface of the guide plate 103, thereby guiding the grains to slide onto the guide trough 102 instead of falling onto it. This method of sliding can prevent the grains from bouncing in all directions.
[0039] like Figure 1 and Figure 4 As shown, a rear rotating shaft 117 is fixedly installed on the machine body 101, and an upper side plate 116 is rotatably installed on the rear rotating shaft 117. The upper side plate 116 contacts the sieve plate 115. A front sliding shaft 118 is fixedly installed on the upper side plate 116 away from the rear rotating shaft 117. A front sliding groove 119 is fixedly installed on the machine body 101 near the front sliding shaft 118. The front sliding shaft 118 slides on the front sliding groove 119.
[0040] Specifically, because the sieve plate 115 is inclined, in the initial state, the upper side plate 116 is parallel and in contact with the rear rotating shaft 117. When the sieve plate 115 moves back and forth, the sieve plate 115 pushes the upper side plate 116 to rotate on the rear rotating shaft 117. As a result, the end of the upper side plate 116 away from the rear rotating shaft 117 slides on the front sliding groove 119 through the front sliding shaft 118. This allows the upper side plate 116 to adapt to the movement of the sieve plate 115 and block the grain on the sieve plate 115, preventing the grain from overflowing from the side plate.
[0041] like Figure 4 As shown, a motor 110 is fixedly installed on the body 101, a rotating wheel 111 is fixedly connected to the output end of the motor 110, a drive rod 112 is rotatably connected to the rotating wheel 111, and a push-pull plate 113 is fixedly installed on the outer support frame 114, and the push-pull plate 113 is rotatably connected to the drive rod 112.
[0042] Specifically, when it is necessary to control the reciprocating movement of the sieve plate 115, the motor 110 is started, and the motor 110 drives the rotating wheel 111 to rotate. In the initial state, as shown... Figure 4As shown, the right end of the drive rod 112 is at the rightmost end of the rotating wheel 111. When the rotating wheel 111 rotates clockwise, it causes the right end of the drive rod 112 to move to the left. This causes the left end of the drive rod 112 to push the push-pull plate 113, which in turn pushes the outer support frame 114 to slide on the machine body 101. Finally, the reciprocating drive of the right end of the drive rod 112 by the rotating wheel 111 controls the reciprocating movement of the outer support frame 114 on the machine body 101, thereby realizing the reciprocating movement of the sieve plate 115. This causes the grain to be pushed by the sieve plate 115 and jump. The jumping amplitude is controlled by controlling the rotation speed of the rotating wheel 111 by the motor 110 to avoid the rotation speed being too fast, which would cause the sieve plate 115 to push the grain to jump too much and cause overflow.
[0043] like Figure 5 and Figure 6 As shown, a crossbeam is provided on the inner support frame 121, and multiple connecting shafts 125 are rotatably connected to the crossbeam. A push rod 126 is rotatably connected to the connecting shaft 125, and the end of the push rod 126 away from the connecting shaft 125 is rotatably mounted on the machine body 101.
[0044] like Figure 6 As shown, specifically, when the outer support frame 114 reciprocates, the outer support frame 114 pushes and pulls the inner support frame 121 through the limiting plate 120, so that the inner support frame 121 follows the reciprocating movement of the outer support frame 114. When the inner support frame 121 reciprocates, the crossbar of the inner support frame 121 pushes the left end of the push rod 126 through the connecting shaft 125. Since the right end of the push rod 126 is fixed in position on the machine body 101, the rotation of the push rod 126 pushes the connecting shaft 125 and the inner support frame 121 to move upward. The vertical slide bar of the inner support frame 121 slides vertically on the limiting plate 120 and pushes the bottom plate 122 to move towards the sieve plate 115. The insertion rod 123 on the bottom plate 122 is inserted into the filter hole of the sieve plate 115, pushing the impurities stuck in the filter hole of the sieve plate 115 to dislodge them, so as to avoid continuous blockage of the filter hole and affect subsequent screening.
[0045] After being pushed by the insertion rod 123, the impurities continue to bounce as the sieve plate 115 pushes them, changing their direction or dispersing multiple clustered impurities. Ultimately, the impurities pass through the filter holes of the sieve plate 115 with a smaller width or as individual impurities. That is, the cross-section of the impurities varies at different angles; a smaller cross-section facilitates their passage through the filter holes of the sieve plate 115. Furthermore, due to the reciprocating movement of the sieve plate 115 and the elasticity of its material, the filter holes of the sieve plate 115 are stretched and compressed, causing the hole size to fluctuate. When the holes enlarge, some impurities stuck in the holes gain some space to pass through. Although this method causes some grains to fall through the filter holes, this is within acceptable limits. Removing grains from a large quantity of grains is more difficult than removing a small amount of impurities, or simply discarding this small amount of grain. This is acceptable for the overall screening effect and efficiency of the grains.
[0046] If the minimum cross-section of the impurity is still larger than the filter holes of the sieve plate 115, the impurity cannot pass through. Such impurities that exceed the filter hole specifications of the sieve plate 115 need to be screened by setting a filter screen at the feed inlet of the feed trough 105 before screening. This filter screen screens impurities with specifications larger than the filter holes of the sieve plate 115.
[0047] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A grain impurity removal and screening machine, comprising a body (101), characterized in that: An outer support frame (114) is slidably mounted on the body (101), and a sieve plate (115) is fixedly mounted on the outer support frame (114). The sieve plate (115) is elastic. A limit plate (120) is fixedly mounted on the outer support frame (114), and an inner support frame (121) is slidably mounted on the limit plate (120). The vertical slide rod of the inner support frame (121) slides vertically on the inner support frame (121), and a base plate (122) is fixedly mounted on the vertical slide rod of the inner support frame (121). Multiple insert rods (123) are fixedly installed on the base plate (122), each insert rod (123) corresponds to a filter hole on the sieve plate (115). A guide groove (102) is fixedly installed on the machine body (101), an intermediate conveying groove (104) is fixedly installed on the guide groove (102), a feed chute (105) is fixedly installed on the intermediate conveying groove (104), and a pull rod (106) for controlling the material conveying speed of the intermediate conveying groove (104) is slidably installed on the intermediate conveying groove (104).
2. The grain impurity removal and screening machine according to claim 1, characterized in that: Multiple guide blocks (107) are fixedly installed on the intermediate conveying trough (104). Two symmetrically arranged inclined surfaces are provided on the guide blocks (107), and the high points of the inclined surfaces are in contact with each other.
3. The grain impurity removal and screening machine according to claim 1, characterized in that: Multiple baffles (108) are fixedly installed on the pull rod (106). The baffles (108) and the guide block (107) are arranged alternately. A stirring rod (109) is fixedly installed on the baffle (108).
4. A grain impurity removal and screening machine according to claim 1, characterized in that: A guide plate (103) is fixedly installed on the guide groove (102), and the guide plate (103) has an arc-shaped structure.
5. A grain impurity removal and screening machine according to claim 1, characterized in that: A rear rotating shaft (117) is fixedly installed on the machine body (101). An upper side plate (116) is rotatably installed on the rear rotating shaft (117). The upper side plate (116) contacts the sieve plate (115). A front sliding shaft (118) is fixedly installed at one end of the upper side plate (116) away from the rear rotating shaft (117). A front sliding groove (119) is fixedly installed at one end of the machine body (101) near the front sliding shaft (118). The front sliding shaft (118) slides on the front sliding groove (119).
6. A grain impurity removal and screening machine according to claim 1, characterized in that: A motor (110) is fixedly installed on the body (101). A rotating wheel (111) is fixedly connected to the output end of the motor (110). A drive rod (112) is rotatably connected to the rotating wheel (111). A push-pull plate (113) is fixedly installed on the outer support frame (114). The push-pull plate (113) is rotatably connected to the drive rod (112).
7. A grain impurity removal and screening machine according to claim 1, characterized in that: The inner support frame (121) is provided with a crossbeam, on which a plurality of connecting shafts (125) are rotatably connected. A push rod (126) is rotatably connected to the connecting shaft (125), and the end of the push rod (126) away from the connecting shaft (125) is rotatably mounted on the body (101).