A multi-zone pneumatic screening machine

Abstract

The present application belongs to the technical field of screening machines, and particularly relates to a pneumatic screening machine with multiple regions working in combination, which comprises a pneumatic screening machine shell, characterized in that: the top of the pneumatic screening machine shell is provided with a feeding port, a fan is fixedly installed on the side of the pneumatic screening machine shell close to the feeding port, the side of the pneumatic screening machine shell opposite to the fan is provided with an air outlet, the bottom of the pneumatic screening machine shell is fixedly connected with a plurality of linearly arranged discharge hoppers, the bottom of each discharge hopper is provided with a cover plate, the inner side of the pneumatic screening machine shell is fixedly installed with longitudinal screens corresponding in number to the discharge hoppers, the mesh size of the plurality of longitudinal screens gradually decreases from the fan to the air outlet, the longitudinal screens are arranged in a longitudinal direction, the material is carried by the air power of the fan to move horizontally, so that the material gradually passes through different longitudinal screens, and the material on the longitudinal screens is collected through the corresponding discharge hoppers, and the effect similar to that of a vibrating screen can be achieved under the action of the air power.

Description

Technical Field

[0001] This invention belongs to the field of screening machine technology, specifically relating to a pneumatic screening machine that operates in multiple zones. Background Technology

[0002] Multi-stage screening technology typically uses multiple screens with different mesh sizes stacked vertically. Material is placed from the top of the stacked screens, and the mesh size gradually decreases from top to bottom, thus classifying and screening the material. This multi-stage screening technology is simple, but because it is vertically set, separating the screened material is somewhat difficult. The stacked screens need to be disassembled to remove the screened material, making continuous operation impossible. For devices that collect the screened material in a concentrated manner, continuous operation is not possible, resulting in low efficiency. For devices that collect material from the center or edge, the principle is to change the screen to an inclined plane. Material that can pass through the current layer of screens will be screened, while larger particles will fall from the side or center to the next layer. This type of device, which can operate continuously, can easily collect materials that do not belong to the current screening layer. Summary of the Invention

[0003] To address the problems mentioned in the background section, this invention provides a multi-zone pneumatic screening machine. The screens are arranged longitudinally, and the material is moved laterally by the airflow from a blower, gradually passing through different longitudinal screens. The material on the longitudinal screens is collected through corresponding hoppers. The airflow creates an effect similar to a vibrating screen, keeping the material on the longitudinal screens in an unstable state, resulting in higher screening efficiency and reducing the likelihood of accumulation.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a pneumatic screening machine for multi-area joint operation, comprising a pneumatic screening machine housing, an inlet provided at the top of the pneumatic screening machine housing, a fan fixedly installed on the side of the pneumatic screening machine housing near the inlet, an exhaust port provided on the side of the pneumatic screening machine housing opposite to the fan, a plurality of linearly arranged hoppers fixedly connected to the bottom of the pneumatic screening machine housing, a cover plate provided at the bottom of the hoppers, and longitudinal screens corresponding to the number of hoppers fixedly installed on the inner side of the pneumatic screening machine housing, wherein the mesh size of the plurality of longitudinal screens gradually decreases from the direction of the fan to the exhaust port.

[0005] As a preferred embodiment of the multi-area joint pneumatic screening machine of the present invention, the screening surface of the longitudinal screen is an arc-shaped structure that bends towards the exhaust port.

[0006] As a preferred embodiment of the pneumatic screening machine for multi-area joint operation of the present invention, the screening surface of the longitudinal screen can rotate towards the lower hopper; The longitudinal screen includes at least two rotating rollers, which are rotatably connected to the pneumatic screening machine housing via rotating shafts fixed at their ends. A drive motor is fixedly connected to the outside of the pneumatic screening machine housing, and the drive motor is used to drive the rotating shafts to rotate.

[0007] As a preferred embodiment of the multi-area joint pneumatic screening machine of the present invention, the bottom of the longitudinal screen is fixedly connected with a partition plate for guiding the material into the target hopper.

[0008] As a preferred embodiment of the pneumatic screening machine for multi-area joint operation of the present invention, the surface of the rotating roller is provided with several circular grooves at equal intervals. The rotating roller is uniformly installed with longitudinally arranged flexible wires through the circular grooves, and one side of several flexible wires contacts several horizontally arranged hard wires to form a mesh.

[0009] As a preferred embodiment of the multi-area joint pneumatic screening machine of the present invention, the rigid wire is fixedly connected to the inner side of the pneumatic screening machine housing by a sealing frame.

[0010] As a preferred embodiment of the pneumatic screening machine for multi-region joint operation of the present invention, a plurality of hard filaments are arranged along an arc-shaped trajectory, and the arc-shaped trajectory of the hard filaments bends toward the exhaust port.

[0011] In a preferred embodiment of the multi-regional pneumatic screening machine of the present invention, the rigid filament is closer to the blower side than the flexible filament.

[0012] As a preferred embodiment of the multi-area joint pneumatic screening machine of the present invention, a transmission wheel is fixedly connected to the outside of the rotating shaft extending outside the outer side of the pneumatic screening machine housing. The transmission wheels on several longitudinal screens are all driven by flexible transmission components. An extrusion flexible transmission component and an extrusion wheel that increases the contact area between the flexible transmission component and the transmission wheel are fixedly connected to the outer surface of the pneumatic screening machine housing.

[0013] As a preferred embodiment of the multi-area joint pneumatic screening machine of the present invention, the diameter of the transmission wheel gradually increases from the direction of the fan to the exhaust port.

[0014] Compared with existing technologies, the advantages of this invention are as follows: The screens are arranged longitudinally, and the material is moved laterally by the wind power of a blower, gradually passing through different longitudinal screens. The material on the longitudinal screens is collected through corresponding hoppers. The wind power creates an effect similar to a vibrating screen, keeping the material on the longitudinal screens in an unstable state, resulting in higher screening efficiency and less accumulation. Simultaneously, the wind power can more quickly blow smaller particles to the next longitudinal screen with even smaller mesh sizes, resulting in high efficiency and more precise particle size separation in the step-by-step screening process. During screening, the cover plate must be closed; otherwise, airflow will pass through from the bottom. Side flow prevents screening from taking place. In other words, during operation, the exhaust vent is the only outlet for air. Inside the device, the mesh of the longitudinal screen is the only place where air can pass through. The feed inlet is connected to the hopper, and a valve needs to be installed on the pipe between the hopper and the feed inlet to control the feeding speed. This device must not be used alone, otherwise the feed inlet may become the exhaust vent during operation. After screening is completed, the fan must be turned off first before the cover can be opened. This device relies on wind power for screening. For materials with high mass or density, if they cannot be effectively and stably driven through the longitudinal screen by wind power, screening cannot be performed. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a first-view schematic diagram of the overall structure of the present invention; Figure 2 This is a second-view schematic diagram of the overall structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the pneumatic screening machine housing in this invention; Figure 4 This is a schematic diagram of the connection structure of the longitudinal screen in this invention; Figure 5 In this invention Figure 4 An enlarged structural diagram at point A; Figure 6 This is a schematic diagram showing the structural separation of the longitudinal screen in this invention; In the picture: 1. Pneumatic screening machine casing; 2. Feed inlet; 3. Blower; 4. Exhaust outlet; 5. Feed hopper; 6. Cover plate; 7. Longitudinal screen; 8. Divider plate; 701. Rotary roller; 702. Rotary shaft; 703. Drive motor; 704, flexible yarn; 705, hard yarn; 706. Sealing frame; 707. Drive wheel; 708. Flexible drive component; 709. Extrusion wheel. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] like Figures 1-6 As shown: A pneumatic screening machine for multi-area joint operation includes a pneumatic screening machine housing 1, a feed inlet 2 at the top of the pneumatic screening machine housing 1, a blower 3 fixedly installed on the side of the pneumatic screening machine housing 1 near the feed inlet 2, an exhaust port 4 on the side of the pneumatic screening machine housing 1 opposite to the blower 3, a plurality of linearly arranged hoppers 5 fixedly connected to the bottom of the pneumatic screening machine housing 1, a cover plate 6 at the bottom of the hoppers 5, and longitudinal screens 7 corresponding to the number of hoppers 5 fixedly installed on the inner side of the pneumatic screening machine housing 1. From the blower 3 to the exhaust port 4, the mesh size of the longitudinal screens 7 gradually decreases, and a partition plate 8 for guiding materials into the target hoppers 5 is fixedly connected to the bottom of the longitudinal screens 7.

[0018] Multi-stage screening technology typically uses multiple screens with different mesh sizes stacked vertically. Material is placed from the top of the stacked screens, and the mesh size gradually decreases from top to bottom, thus classifying and screening the material. This multi-stage screening technology is simple, but because it is vertically set, it makes separating the screened material somewhat difficult. The stacked screens need to be disassembled to remove the screened material, making continuous operation impossible. For devices that collect the screened material in a concentrated manner, continuous operation is not possible, resulting in low efficiency. For devices that collect material from the center or edge, the principle is to change the screen to an inclined plane. Material that can pass through the current layer of screens will be screened, while larger particles will fall from the side or center to the next layer. This type of device, which can operate continuously, can easily collect materials that do not belong to the current screening layer. In this scheme, the screens are arranged longitudinally, and the air force of the blower 3 carries the material laterally, allowing it to gradually pass through different longitudinal screens 7. The material on the longitudinal screens 7 is collected through the corresponding hoppers 5. Under the action of the air force, an effect similar to a vibrating screen can be achieved, keeping the material on the longitudinal screens 7 in an unstable state, resulting in higher screening efficiency and less accumulation. At the same time, the air force can more quickly blow smaller particles to the next longitudinal screen 7 with smaller mesh size. The efficiency of the step-by-step screening process is high, and the screening particle size is more accurate. During the screening process, the cover plate 6 must be closed; otherwise, the airflow will flow out from the bottom, causing the screen to... The separate operation cannot be carried out. In other words, during operation, only the exhaust port 4 can be guaranteed to be the only air outlet. For the inside of the device, the mesh of the longitudinal screen 7 is the only place where air can pass through. The feed port 2 is connected to the hopper. A valve needs to be installed on the pipe between the hopper and the feed port 2 to control the feeding speed. This device must not be used alone. Otherwise, the feed port 2 may become the exhaust port during operation. After the screening is completed, the blower 3 must be turned off first, and then the cover plate 6 can be opened. This device relies on the blowing force to screen. For materials with large mass or high density, if they cannot be effectively and stably driven by the wind to pass through the longitudinal screen 7, screening cannot be carried out.

[0019] In an optional embodiment, the screening surface of the longitudinal screen 7 is an arc-shaped structure that curves toward the exhaust port 4.

[0020] In this embodiment, the arc-shaped structure is more conducive to the material being gathered and screened on the longitudinal screen 7, making the air force more concentrated and less likely to result in the material entering the hopper 5 without being completely screened.

[0021] In an optional embodiment, the screening surface of the longitudinal screen 7 can rotate toward the lower hopper 5.

[0022] In this embodiment, the arc-shaped longitudinal screen 7 can concentrate the wind force and screen more thoroughly. However, the disadvantage is that the material on the longitudinal screen 7 is not easy to fall into the feed hopper 5 under the action of the wind. The screening surface of the longitudinal screen 7 can rotate towards the feed hopper 5, so that the screened material is actively fed into the feed hopper 5.

[0023] In an optional embodiment, the longitudinal screen 7 includes no fewer than two rotating rollers 701, which are rotatably connected to the pneumatic screening machine housing 1 via rotating shafts 702 fixed at their ends. A drive motor 703 is fixedly connected to the outside of the pneumatic screening machine housing 1, and the drive motor 703 is used to drive the rotating shafts 702 to rotate.

[0024] In this embodiment, the drive motor 703 is fixed to the outer shell of the pneumatic screening machine housing 1 through a connecting bracket. The drive motor 703 drives the rotating shaft 702 to rotate, and the rotating shaft 702 drives the rotating roller 701 to rotate, thereby causing the rotating roller 701 to drive the flexible screen to rotate. When the length of the flexible screen is greater than the minimum length of the outer surface connection of several rotating rollers 701, the flexible screen can be blown into an arc shape under the action of wind. The minimum length of the outer surface connection of the rotating rollers 701 refers to the minimum length of the outer surface connection of the rotating rollers 701 when, for example, two rotating rollers 701 are connected along their surface tangents.

[0025] In an optional embodiment, the surface of the rotating roller 701 is provided with a plurality of circular grooves at equal intervals. The rotating roller 701 is uniformly installed with longitudinally arranged flexible filaments 704 through the circular grooves. One side of the plurality of flexible filaments 704 contacts the plurality of transversely arranged rigid filaments 705 to form a mesh.

[0026] In this embodiment, the more longitudinal screens 7 there are, the greater the wind resistance. If the flexible screen rotates, at least two sides of the flexible screen will have high wind resistance, which will affect the screening operation. Therefore, replacing the flexible screen with only vertically arranged flexible wires 704 can significantly reduce the wind resistance. The screening surface forms a mesh by contacting one side of several flexible wires 704 with several horizontally arranged hard wires 705. When the flexible wires 704 and hard wires 705 contact to form a mesh, it should be ensured that there are no gaps between them, and excessive contact pressure should be avoided to prevent excessive wear. The contact pressure between the two can be adjusted by the gap between the rotating rollers 701 to adjust the tension of the flexible wires 704, thereby adjusting the contact pressure between the flexible wires 704 and hard wires 705, which can form an effective filter surface. Ultimately, it can be achieved that in a longitudinal screen 7, only the screening side has high wind resistance, while the other side has low wind resistance. Both the flexible wires 704 and hard wires 705 can be set on the windward side.

[0027] In an optional embodiment, the rigid filament 705 is fixedly connected to the inside of the pneumatic screening machine housing 1 by a sealing frame 706.

[0028] In this embodiment, to prevent wind from passing through the gap between the longitudinal screen 7 and the pneumatic screening machine housing 1 without passing through the mesh, the sealing frame 706 is used to block the airflow. The sealing frame 706 also facilitates the processing and installation of the hard wire 705.

[0029] In an optional embodiment, a plurality of rigid filaments 705 are arranged along an arc-shaped trajectory, and the arc-shaped trajectory of the rigid filaments 705 bends toward the exhaust port 4.

[0030] In this embodiment, the arc-shaped structure of the rigid filament 705 can force the flexible filament 704 to form an arc-shaped structure.

[0031] In an alternative embodiment, the rigid filament 705 is closer to the side of the fan 3 than the flexible filament 704.

[0032] In this embodiment, the flexible filament 704 can adhere to the surface of the rigid filament 705 when it is taut, forming a stable arc-shaped sieve surface. Compared with the arc-shaped structure formed by wind, the structure of the arc-shaped surface formed by taut force is more stable. The rigid filament 705 can be understood as a fixed fence, which only blocks materials laterally. It does not move itself and cannot provide conveying force. The flexible filament 704 is a moving vertical strip of the conveyor belt. When the flexible filament 704 rotates in the direction of the hopper 5, it will generate downward friction or thrust on the material it contacts, just like the conveyor belt. In other words, only the material blocked on the surface of the rigid filament 705 and able to contact the flexible filament 704 can be conveyed downward, so that the material passes over different rigid filaments 705 one by one. For larger material particles, the larger material may not be able to directly contact the flexible filament 704, but such larger material can be pushed and moved together by the movable material. Therefore, the thinner the rigid filament 705, the better the effect.

[0033] In an optional embodiment, a drive wheel 707 is fixedly connected to the outside of the rotating shaft 702 extending out of the outer side of the pneumatic screening machine housing 1. The drive wheels 707 on several longitudinal screens 7 are all driven by flexible drive components 708. The outer surface of the pneumatic screening machine housing 1 is fixedly connected to the extrusion flexible drive component 708 and the extrusion wheel 709 which increases the contact area between the flexible drive component 708 and the drive wheel 707.

[0034] In this embodiment, the transmission wheel 707 can be a pulley or a sprocket, and the flexible transmission component 708 can be a belt or a chain. When any one of the rotating rollers 701 is driven to rotate by the drive motor 703, the rotating roller 701 drives the rotating shaft 702 to rotate, and the rotating shaft 702 drives the transmission wheel 707 to rotate. The transmission wheel 707 will cause the transmission wheels 707 in other longitudinal screens 7 to rotate together through the flexible transmission component 708. Since the transmission wheels 707 are all horizontally arranged, in order to avoid the small contact area between the flexible transmission component 708 and the transmission wheel 707, the extrusion wheel 709 forces the flexible transmission component 708 to deform, thereby increasing the contact area between the flexible transmission component 708 and the transmission wheel 707 and thus avoiding slippage during transmission.

[0035] In an optional embodiment, the diameter of the drive wheel 707 gradually increases from the direction of the fan 3 to the exhaust port 4.

[0036] In this embodiment, the diameter of the drive wheel 707 gradually increases, so the rotation speed of the corresponding flexible filament 704 will slow down. From the fan 3 to the exhaust port 4, the mesh size formed by the flexible filament 704 and the rigid filament 705 gradually decreases, and the rotation speed is correspondingly reduced. In order to ensure that the material has enough residence time on the screen surface to complete the screening, the linear speed of the flexible filament needs to be reduced as the mesh size decreases, thereby reducing the speed at which the material is conveyed. That is to say, the smaller the mesh diameter, the lower the filtration efficiency. This is because the resistance of the wind is greater when passing through a smaller mesh. If the rotation speed is too fast, it may be pushed into the hopper 5 before the screening is completed. Therefore, from the fan 3 to the exhaust port 4, the rotation speed of the flexible filament 704 should gradually decrease.

[0037] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pneumatic screening machine that operates in multiple zones, comprising a pneumatic screening machine housing (1), characterized in that: The pneumatic screening machine housing (1) has a feed inlet (2) at the top. A fan (3) is fixedly installed on the side of the pneumatic screening machine housing (1) near the feed inlet (2). An exhaust port (4) is provided on the side of the pneumatic screening machine housing (1) opposite to the fan (3). Several linearly arranged hoppers (5) are fixedly connected to the bottom of the pneumatic screening machine housing (1). A cover plate (6) is provided at the bottom of the hoppers (5). A longitudinal screen (7) corresponding to the number of hoppers (5) is fixedly installed on the inner side of the pneumatic screening machine housing (1). The mesh size of the several longitudinal screens (7) gradually decreases from the direction from the fan (3) to the exhaust port (4). The sieving surface of the longitudinal screen (7) is an arc-shaped structure that bends toward the exhaust port (4); The sieving surface of the longitudinal screen (7) can rotate toward the lower hopper (5); The longitudinal screen (7) includes no less than two rotating rollers (701). The rotating rollers (701) are rotatably connected to the pneumatic screening machine housing (1) via rotating shafts (702) fixed at their ends. A drive motor (703) is fixedly connected to the outside of the pneumatic screening machine housing (1). The drive motor (703) is used to drive the rotating shafts (702) to rotate. The surface of the rotating roller (701) is provided with several circular grooves at equal intervals. The rotating roller (701) is uniformly installed with longitudinally arranged flexible filaments (704) through the circular grooves. One side of the flexible filaments (704) contacts the transversely arranged hard filaments (705) to form a mesh. The rigid filament (705) is closer to the side of the fan (3) than the flexible filament (704).

2. The pneumatic screening machine with multi-zone joint operation according to claim 1, characterized in that: The bottom of the longitudinal screen (7) is fixedly connected to a partition plate (8) for guiding the material into the target hopper (5).

3. The pneumatic screening machine with multi-zone joint operation according to claim 1, characterized in that: The hard filament (705) is fixedly connected to the inside of the pneumatic screening machine housing (1) by a sealing frame (706).

4. The pneumatic screening machine with multi-zone joint operation according to claim 1 or 3, characterized in that: Several hard filaments (705) are arranged along an arc-shaped trajectory, and the arc-shaped trajectory of the hard filaments (705) bends toward the exhaust port (4).

5. The pneumatic screening machine with multi-zone joint operation according to claim 2, characterized in that: A drive wheel (707) is fixedly connected to the outside of the rotating shaft (702) extending out of the pneumatic screening machine housing (1). The drive wheels (707) on several longitudinal screens (7) are all driven by flexible drive components (708). The outer surface of the pneumatic screening machine housing (1) is fixedly connected to a compression flexible drive component (708) and a compression wheel (709) that increases the contact area between the flexible drive component (708) and the drive wheel (707).

6. The pneumatic screening machine with multi-zone joint operation according to claim 5, characterized in that: The diameter of the drive wheel (707) gradually increases from the direction from the fan (3) to the exhaust port (4).

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