Multideck flat rotary cleaning screen
By installing a central vibration device and a rotary swing mechanism in the multi-layer planar rotary cleaning screen, the problem of uneven swing amplitude at the high and low ends of the screen is solved, achieving uniform screening of materials and improving the stability of the equipment. This simplifies the screen replacement and maintenance process and enhances safety and production efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU GUOCHANG MACHINERY EQUIPMENT TECHNOLOGY CO LTD
- Filing Date
- 2025-09-01
- Publication Date
- 2026-06-09
AI Technical Summary
The existing planar rotary screen has a large swing amplitude at the high end of the screen and a small swing amplitude at the low end, resulting in uneven material screening and unsatisfactory impurity removal effect.
The multi-layer planar rotary cleaning screen adopts a vibration device installed in the center of the screen bed unit. The rotary swing mechanism drives multiple screen bed units to vibrate, and the material on the screen is screened evenly. The position of the screen bed unit is fixed by cantilever and universal joint to form a box structure, which improves the stability of the equipment and energy utilization.
It achieves uniform screening of materials, improves the stability and lifespan of the equipment, facilitates screen replacement and maintenance, reduces dust spillage, and enhances safety and production efficiency.
Smart Images
Figure CN224332737U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to grain cleaning and impurity removal equipment, specifically a multi-layer planar rotary cleaning screen. Background Technology
[0002] In existing technologies, grain cleaning and impurity removal can be achieved through screening methods, such as flat vibrating screens, roller screens, and flat rotary screens.
[0003] Taking a planar rotary screen as an example, common types include single-layer screens and multi-layer screens with stacked meshes. The screen is inclined, with a high feed inlet and a low discharge outlet. The screen is mounted on a screen frame, with the lower end of the frame slidingly connected to the overall machine structure. The upper end of the frame is connected to a rotary motor via a transmission device. The transmission device, through an eccentric wheel and shaft structure, drives the middle of the upper end of the screen frame to rotate with a small radius, thereby causing the screen to vibrate and achieve screening. The main problem with this structure is that the upper end of the screen has a larger swing amplitude, while the lower end has a very small swing amplitude, resulting in uneven screening of the material on the screen. When the material is at the lower end, the impurity removal effect is very poor. Summary of the Invention
[0004] To address the aforementioned problems in the existing technology, this utility model proposes a multi-layer planar rotary cleaning screen, comprising a frame, a screen bed unit, and a vibration device;
[0005] The sieve bed unit includes a closed shell; multiple layers of parallel sieves are installed inside the shell, forming multiple screening cavities; there is a feed inlet at the front end of the sieve bed unit and multiple discharge outlets at the rear end; the feed inlet communicates with the uppermost screening cavity, and each discharge outlet communicates with a corresponding screening cavity; the front end of the sieve bed unit is higher than the rear end; the vibration device includes a power source and a rotary swing mechanism; the power output mechanism of the power source and the power input mechanism of the rotary swing mechanism are connected through a transmission mechanism. In this utility model:
[0006] The screen bed unit has at least two parallel ones; the relative position of each screen bed unit is fixed; each screen bed unit is connected to the frame by multiple cantilever arms; each cantilever arm has a universal joint at both ends, and two universal joints connect the screen bed unit and the frame respectively.
[0007] The gyratory swing mechanism of the vibration device is connected to the center of the top or bottom surface of the shell of the sieve bed unit.
[0008] In this structure, a single vibration device drives multiple screen bed units, improving energy utilization and operational efficiency. The rotary oscillating mechanism is connected to the center of the top or bottom surface of the screen bed unit's housing, ensuring the vibration source is centrally located, which facilitates uniform screening of materials on the screen. Simultaneously, the fixed relative positions of each screen bed unit enhance equipment stability, reduce non-productive vibrations, and extend equipment lifespan.
[0009] Furthermore, the left and right side plates of the shell of each screen bed unit share the same large side plate, and the front and rear end plates of the shell share the same large end plate. The left and right large side plates and the front and rear large end plates form a rectangular cavity. The top and bottom surfaces of the cavity are connected to the top plate and the bottom plate, respectively, forming a swing box. Each edge of the swing box is made of steel profiles, and reinforcing steel profiles are connected between opposite edges. The cantilever is connected to the steel profiles of the moving box. The power source of the vibration device is installed in the middle of the swing box body, and the rotary swing mechanism is installed in the middle of the swing box body.
[0010] In this structure, each screening bed unit becomes a unified box-like structure, facilitating operation control and ensuring consistency and stability across all units. The sealed box design reduces dust spillage. The overall structure also makes transportation and installation easier.
[0011] Furthermore, within the swing box, the screens of each screen bed unit are connected to the frame (screen frame); the inner walls of the large side plates on the left and right sides of the swing box are equipped with support bars for supporting the two sides of the frame, and above the support bars are multiple eccentric pressure rollers for pressing the two sides of the frame, with the sides of the frame located between a pair of eccentric pressure rollers and the support bars; the eccentric pressure rollers are fixed to one end of the axle, and the other end of the axle passes through the through holes on the large side plates on the left and right sides, with the other end of the axle connected to fasteners.
[0012] With this structure, the screen can be easily replaced. The screen and frame are integrated and inserted between the eccentric pressure roller and the support bar from the first or last end. Then, the shaft is rotated outside the box to drive the eccentric pressure roller to rotate, so that the eccentric pressure roller presses against the side of the frame. Finally, it is fastened with fasteners to prevent the eccentric pressure roller from rotating.
[0013] Furthermore, the large end plates at the front and rear of the swing box are divided into fixed and movable parts, respectively;
[0014] I. For the large end plate at the front:
[0015] The fixed part is located at the bottom of the lowest layer of screen;
[0016] One side of the movable part is connected to the swing box via a hinge mechanism; the feed inlet is on the movable part, and the feed pipe is connected to the movable part;
[0017] II. For the large end plate at the rear:
[0018] The fixed part is located at the top of the uppermost screen.
[0019] One side of the movable part is connected to the swing box via a hinge mechanism; each discharge port is on the movable part, and each discharge pipe is connected to the movable part.
[0020] With this structure, equipment maintenance is relatively easy. For example, when replacing the screen, the screen can be removed by opening the movable part of the end plate from either the front or rear end of the equipment, depending on the production site conditions.
[0021] During implementation, it is recommended to use a sealing structure between the moving parts and the fixed parts, between the moving parts and the swing box, and between the inner side of the moving parts and the screen bed unit.
[0022] Furthermore, multiple limit sensors are installed between the frame and the screening unit; each limit sensor forms the swing area of the screening unit. Due to the swing, there is a relative displacement between the screening unit and the frame. If the relative displacement exceeds a threshold, the limit sensors are triggered. For the swing housing, the limit sensors are located outside the housing and can be mounted on the frame.
[0023] This structure is conducive to safe production.
[0024] Furthermore, the aspect ratio of the screen is 1:1 to 4:3.
[0025] With this structure, the wide screen surface design of the screen reduces the flow time of the material on the screen surface.
[0026] Furthermore, each screen bed unit has a dust extraction port on its top;
[0027] For the oscillating box structure: The top of the oscillating box has a dust suction port, which is connected to the dust suction port of the uppermost screen bed unit inside through a corrugated hose; the movable part of the large end plate at the rear of the oscillating box is surrounded by a shell, and the movable part has a dust suction pipe perforation. Each discharge pipe is inside the shell, and a dust suction port is opened at the top of the shell; one end of a corrugated hose is connected to the dust suction ports of the other screen bed units except the uppermost screen bed unit, and the other end of the corrugated hose passes through the dust suction pipe perforation and connects to the dust suction port at the top of the shell.
[0028] This structure allows for the removal of dust generated during operation, preventing dust leakage.
[0029] Furthermore, elastic cleaning balls are placed on each screen.
[0030] With this structure, during equipment operation, the elastic cleaning balls vibrate with the material, striking the screen and preventing the screen holes from becoming blocked.
[0031] Furthermore, the rotary swing mechanism is composed of an eccentric block connected to a vertical rotating shaft; the height of the eccentric block is in the middle of the swing box, and the axis of the vertical rotating shaft passes through the center of the screen bed unit;
[0032] The power source of the vibration device is a geared motor, which is connected to the vertical rotating shaft inside the swing box via a belt drive mechanism; the geared motor is located outside the swing box.
[0033] In this structure, the eccentric block in the middle position drives the entire box to swing, improving the operating efficiency of the equipment.
[0034] During operation, a safety rope is connected between the frame and the swing box to further prevent the equipment from falling. For the grain discharge port, an air-separation dust collector can also be connected to further remove dust mixed in with the grain.
[0035] This invention places the power system in the middle of the screening mechanism, facilitating the adjustment of vibration parameters during operation. Simultaneously, the equipment's center of gravity is stable, resulting in more uniform material screening. This not only increases the single-machine output but also extends the equipment's service life. Besides its widespread application in the grain industry, this invention can also be used for material screening in the oil, mining, feed, and chemical industries by replacing the appropriate screens. Attached Figure Description
[0036] Figure 1 This is a schematic diagram of the entire machine.
[0037] Figure 2 This is a schematic diagram of the interior of the screening bed unit (sectional view, compared to...) Figure 1 (same perspective)
[0038] Figure 3 This is a schematic diagram of the vibration device (top view).
[0039] Figure 4 This is a schematic diagram showing the connection between the rotary swing mechanism and the screen bed unit (and...). Figure 1 (same perspective)
[0040] Figure 5 This is a schematic diagram of the connection structure between the screen and the swing box (and) Figure 1 (same perspective)
[0041] Figure 6 This is a schematic diagram (sectional view) of the connection structure between the screen and the swing box. Figure 5 (Left view)
[0042] Figure 7 This is a schematic diagram of the swing box. Figure 1 (Right-side view)
[0043] Figure 8 This is a schematic diagram of the movable part of the rear large end plate. Figure 1 (Left-hand view)
[0044] Figure 9 This is a schematic diagram of the movable part of the rear large end plate and the discharge part (and...). Figure 1 (same perspective)
[0045] Figure 10 This is a schematic diagram of the entire machine. Figure 1(Top-down view).
[0046] In the diagram: 1. Frame; 2. Swing box; 3. Cantilever; 4. Universal joint; 5. Screening unit; 6. Shell; 7. Screen; 8. Frame; 9. Screening cavity; 10. Feed inlet; 11. Discharge outlet; 12. Structural steel; 13. Support bar; 14. Eccentric pressure roller; 15. Hinge mechanism; 16. Feed pipe; 17. Discharge pipe; 18. Wheel axle; 19. Nut; 20. Dust suction port; 21. Dust suction pipe perforation; 22. Vertical rotating shaft; 23. Eccentric block; 24. Gear motor. Detailed Implementation
[0047] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0048] refer to Figures 1-10 The multi-layer planar rotary cleaning screen of this utility model includes a frame 1, a screen bed unit 5 and a vibration device;
[0049] refer to Figure 2 The sieve bed unit 5 includes a closed shell 6; multiple layers of screens 7 arranged vertically and horizontally are installed inside the shell to form multiple screening cavities 9; there is a feed inlet 10 at the front end of the sieve bed unit and multiple discharge outlets 11 at the rear end of the sieve bed unit; the feed inlet is connected to the uppermost screening cavity, and each discharge outlet is connected to the corresponding screening cavity; the front end of the sieve bed unit is higher than the rear end.
[0050] The vibration device includes a power source and a rotary swing mechanism; the power output mechanism of the power source and the power input mechanism of the rotary swing mechanism are connected through a transmission mechanism. The rotary swing mechanism of the vibration device is connected to the center of the top or bottom surface of the shell of the screen bed unit.
[0051] The sieve bed unit 5 has at least two parallel units; the relative positions of each sieve bed unit are fixed.
[0052] Each screen bed unit is connected to the frame 1 by multiple cantilever arms 3; each cantilever arm 3 has a universal joint 4 at both ends, and the two universal joints connect the screen bed unit and the frame respectively.
[0053] In this example:
[0054] There are two sieve bed units 5.
[0055] refer to Figure 1Each screen bed unit 5 has its left and right side plates sharing the same large side plate, and its front and rear end plates sharing the same large end plate. The left and right large side plates and the front and rear large end plates form a rectangular cavity. The top and bottom surfaces of the cavity are connected to the top plate and the bottom plate, respectively, forming the swing box 2. Each edge of the swing box is made of steel profile 12, and reinforcing steel profiles are connected between opposite edges. The cantilever 3 is connected to the steel profiles of the swing box 2. The power source of the vibration device is installed in the middle of the swing box body, and the rotary swing mechanism is installed in the middle of the swing box body.
[0056] refer to Figure 5 and Figure 6 Inside the swing box, the screens 7 of each screen bed unit are connected to the frame 8. The inner walls of the large side plates on the left and right sides of the swing box 2 are fitted with support bars 13 to support the sides of the frame. Above the support bars are multiple eccentric pressure rollers 14 to press the sides of the frame. The sides of the frame are located between a pair of eccentric pressure rollers and the support bars. The eccentric pressure rollers 14 are fixed to one end of axle 18, and the other end of the axle passes through a through hole in the large side plates, with a fastener connected to the other end. In this example, the other end of axle 18 has an external thread, which is screwed onto a nut 19. During use, rotating the nut causes the axle to rotate first until the eccentric wheel presses against the frame, at which point the axle stops rotating. Continuing to rotate the nut continues until the nut tightens the axle. During operation, washers and other anti-reverse parts are placed between the nut and the large side plates.
[0057] refer to Figure 7 , Figure 8 and Figure 9 The large end plates at the front and rear of the swing box 2 are divided into fixed parts and movable parts, respectively;
[0058] a. For the large end plate at the front (e.g.) Figure 7 ):
[0059] The fixed part is located at the bottom of the lowest screen; one side of the movable part is connected to the swing box 2 via a hinge mechanism 15; the feed inlet 10 is on the movable part, and the feed pipe 16 is connected to the movable part.
[0060] b. For the large end plate at the rear (e.g.) Figure 8 and Figure 9 ):
[0061] The fixed part is located above the top layer of the screen; one side of the movable part is connected to the swing box via a hinge mechanism; each discharge port 11 is on the movable part, and each discharge pipe 17 is connected to the movable part.
[0062] Multiple limit sensors are installed between the frame and the screen bed unit; each limit sensor forms the swing area of the screen bed unit. For the swing housing, the limit sensors are located outside the housing and can be mounted on the frame.
[0063] The aspect ratio of the sieve is 1:1 to 4:3.
[0064] Each screen bed unit 5 has a dust suction port 20 on its top;
[0065] For the oscillating box 2: The top of the oscillating box has a dust suction port 20, which is connected to the dust suction port of the uppermost screen bed unit 5 inside it through a corrugated hose; the movable part of the large end plate at the rear of the oscillating box is surrounded by a shell, and a dust suction pipe through hole 21 is opened on the movable part. Each discharge pipe 17 is inside the shell (for two screen bed units, their discharge ports of the same material can be connected to the same discharge pipe inside the shell, and the discharge pipe is connected to the corresponding external collection equipment). A dust suction port 20 is opened on the top of the shell; one end of a corrugated hose is connected to the dust suction port of the other screen bed units except the uppermost screen bed unit (in this example there are 2 screen bed units, so the corrugated hose only needs to be connected to the dust suction port of the lower screen bed unit), and the other end of the corrugated hose passes through the dust suction pipe through hole 21 and connects to the dust suction port 20 on the top of the shell.
[0066] Place elastic cleaning balls on each screen.
[0067] refer to Figure 3 and Figure 4 The rotary swing mechanism consists of an eccentric block 23 connected to a vertical rotating shaft 22. The height of the eccentric block is at the middle of the swing box (in this example, there are two symmetrical eccentric blocks, and their centers of gravity are at the middle of the swing box). The axis of the vertical rotating shaft 22 passes through the center of the screen bed unit 5. The power source of the vibration device is a geared motor 24, which is connected to the vertical rotating shaft 22 via a belt drive mechanism. The geared motor is located outside the swing box. In engineering implementation, the inner part of the swing box of the belt drive mechanism can also be isolated in a protective shell, which is located inside the swing box.
[0068] In this embodiment, a two-layer, four-frame sieve bed unit is used (taking soybeans as an example: the first layer of sieves has a mesh size of φ12.7mm to remove large impurities, and the second layer of sieves has a mesh size of φ2.5mm to remove fine impurities). Sufficient tension is ensured on all sieve surfaces, and highly elastic automatic cleaning balls placed inside the screening cavity effectively remove impurities trapped in the sieve holes, ensuring screening efficiency and capacity. The sieve frame is made of aluminum alloy; the sieve mesh is selected from stainless steel woven mesh or perforated mesh depending on the material being processed.
[0069] The external frame of the motion housing is made of carbon steel, as are the sides and bottom plate where it contacts materials. A deviation emergency stop device (i.e., a limit sensor) is installed between the frame and the motion housing, and the sensor meets the requirements for Zone 21 dust explosion protection. Zone 21 dust explosion protection means that during normal operation, the amount of dust may be sufficient to form a combustible dust-air mixture (combustible dust cloud). In dust explosion safety regulations, Zone 21 is considered the highest dust explosion protection level for dust explosion-proof motors.
Claims
1. A multi-layer planar rotary cleaning screen, comprising a frame, a screen bed unit, and a vibration device; The sieve bed unit includes a closed shell; multiple layers of screens arranged vertically parallel inside the shell form multiple screening cavities; there is a feed inlet at the front end of the sieve bed unit and multiple discharge outlets at the rear end of the sieve bed unit; the feed inlet is connected to the uppermost screening cavity, and each discharge outlet is connected to a corresponding screening cavity; the front end of the sieve bed unit is higher than the rear end. The vibration device includes a power source and a rotary swing mechanism; the power output mechanism of the power source and the power input mechanism of the rotary swing mechanism are connected through a transmission mechanism. Its characteristics are The sieve bed unit has at least two parallel units; the relative positions of each sieve bed unit are fixed. Each screening bed unit is connected to the frame via multiple cantilever arms; each cantilever arm has a universal joint at both ends, with two universal joints connecting the screening bed unit and the frame respectively. The gyratory swing mechanism of the vibration device is connected to the center of the top or bottom surface of the shell of the sieve bed unit.
2. The multi-layer planar rotary cleaning screen according to claim 1, characterized in that: The left and right side plates of the shell of each screen bed unit share the same large side plate, and the front and rear end plates of the shell share the same large end plate. The left and right large side plates and the front and rear large end plates form a rectangular cavity. The top and bottom surfaces of the cavity are connected to the top plate and the bottom plate, respectively, forming a swing box. Each edge of the swing box is made of steel profiles, and reinforcing steel profiles connect the opposite edges; The cantilever is connected to the steel profile of the moving box; The power source of the vibration device is installed in the middle of the swing box body, and the rotary swing mechanism is installed in the middle of the swing box body.
3. The multi-layer planar rotary cleaning screen according to claim 2, characterized in that, in the swing box, the screens of each screen bed unit are connected to the frame; the inner walls of the large side plates on the left and right sides of the swing box are equipped with support bars for supporting the two sides of the frame, and a plurality of eccentric pressure rollers for pressing the two sides of the frame are installed above the support bars, with the side of the frame between a pair of eccentric pressure rollers and the support bars. The eccentric pressure roller is fixed to one end of the axle, and the other end of the axle passes through the through holes on the left and right large side plates. The other end of the axle is connected to a fastener.
4. The multi-layer planar rotary cleaning screen according to claim 1, characterized in that: The large end plates at the front and rear of the swing box are divided into fixed and movable parts, respectively. For the large end plate at the front: The fixed part is located at the bottom of the lowest layer of screen; One side of the movable part is connected to the swing box via a hinge mechanism; the feed inlet is on the movable part, and the feed pipe is connected to the movable part; For the rear large end plate: The fixed part is located at the top of the uppermost screen. One side of the movable part is connected to the swing box via a hinge mechanism; each discharge port is on the movable part, and each discharge pipe is connected to the movable part.
5. The multi-layer planar rotary cleaning screen according to claim 1, characterized in that... Multiple limit sensors are installed between the frame and the screen bed unit; each limit sensor forms the swing area of the screen bed unit.
6. The multi-layer planar rotary cleaning screen according to claim 1, characterized in that: The aspect ratio of the sieve is 1:1 to 4:
3.
7. The multi-layer planar rotary cleaning screen according to claim 4, characterized in that: Each screening unit has a dust extraction port on its top; For the swing box: The top of the swing box has a dust suction port, which is connected to the dust suction port of the uppermost screen bed unit inside through a corrugated hose. The movable part of the large end plate at the rear of the swing box is surrounded by a shell. The movable part has a dust suction pipe perforation. Each discharge pipe is inside the shell. A dust suction port is opened at the top of the shell. One end of a corrugated hose is connected to the dust suction port of each screen unit except the uppermost screen unit. The other end of the corrugated hose passes through the dust suction pipe perforation and connects to the dust suction port at the top of the shell.
8. The multi-layer planar rotary cleaning screen according to claim 1, characterized in that: Place elastic cleaning balls on each screen.
9. The multi-layer planar rotary cleaning screen according to claim 2, characterized in that: The rotary swing mechanism consists of an eccentric block connected to a vertical rotating shaft; the height of the eccentric block is in the middle of the swing box, and the axis of the vertical rotating shaft passes through the center of the screen bed unit. The power source of the vibration device is a geared motor outside the swing box, which is connected to the vertical rotating shaft inside the swing box via a belt drive mechanism.