Novel wind force forced separation multilayer drum screen for dry and fine materials

Abstract

The utility model discloses a novel dry and fine material wind force forced separation multilayer drum screen, which comprises a drum screen, a sealing isolation cover box is covered outside the drum screen, a plurality of layers of screen meshes are arranged on the drum screen, the mesh sizes of the screen meshes are sequentially reduced from inside to outside, and the mesh sizes of the screen meshes on the same layer are the same from front to back. A drum screen feeding port is formed in the front end of the drum screen and corresponds to the inner-layer screen, a high-pressure air inlet nozzle is further arranged at the drum screen feeding port and connected with a variable-frequency high-pressure fan, and an included angle is formed between the air inlet direction of the high-pressure air inlet nozzle and the inner-layer screen. According to the drum screen, materials can be accurately and cleanly sorted through the same layer of screen cloth with the same hole diameter; by arranging multiple layers of screens with different pore diameters, materials can be separated in different particle size ranges step by step, and multi-layer material separation is achieved; by installing the variable-frequency high-pressure fan and the high-pressure air inlet nozzle, dry materials and fine materials can be forcibly sorted, and the phenomenon that meshes of each layer of screen are blocked is effectively prevented, so that it is guaranteed that the drum screen efficiently separates materials with different particle sizes, the labor intensity of workers for frequently cleaning the screens is relieved, and the economic benefits of enterprises are increased.

Description

Technical Field

[0001] This utility model belongs to the field of material separation technology, specifically relating to a dry and fine material forced separation drum screen that separates materials according to their particle size. Background Technology

[0002] Material separation or grading equipment is widely used in metallurgy, building materials, environmental protection, chemical industry, food, light industry, and pharmaceuticals. A drum separator typically consists of a long cylindrical screen frame and a rotating drum. The surface of the drum is usually covered with screens or sieve plates of different sizes for material separation or grading.

[0003] Rotary drum separators are generally shaftless drives, with the power end supported by bearings on the frame and the other end supported by rollers. The main components include a transmission system, rotating drum, frame, rollers, oversize hopper, undersize hopper, dust control device, and distributor. The screen is made of woven wire mesh or perforated steel plate.

[0004] Its working process is as follows:

[0005] 1. Material feeding: The material enters the inside of the drum screen through the feed port.

[0006] 2. Screening process: The drum begins to rotate, and the material is subjected to centrifugal force on the drum surface, moving along the length of the drum. Smaller particles pass through the sieve holes or sieve plate, while larger particles are blocked on the sieve mesh.

[0007] 3. Grading and Separation: Based on the size of the sieve openings or sieve plate, the material is separated into different size grades. Smaller particles pass through the sieve openings or sieve plate, while larger particles are retained on the inner surface of the drum.

[0008] 4. Discharge: After screening, materials of different sizes move forward along the length of the drum and are discharged from the drum screen through the discharge port.

[0009] Generally, drum screens use a single-layer screen, but the screen aperture size ranges from fine to coarse along the length from the inlet to the outlet. However, it is difficult to completely separate fine materials from the material entering the drum screen at the inlet because the material layer is thicker there. Fine materials are not easily separated and thus enter the next coarse screen section, resulting in imprecise material separation and large materials mixed with small materials. Summary of the Invention

[0010] Therefore, this utility model designs a novel multi-layer drum screen for forced air separation of dry and fine materials. Through multiple layers of screens with different apertures, and screens with the same aperture in the same layer, materials can be separated accurately and cleanly.

[0011] The objective of this utility model is achieved through the following means:

[0012] A novel multi-layer rotary drum screen for forced air separation of dry and fine materials includes a rotary drum screen, an outer sealed isolation cover, and multiple layers of screen mesh with progressively smaller mesh sizes from the inside out, and the mesh sizes of the same layer of screen mesh being the same from front to back. The feed inlet of the rotary drum screen is located at the front end of the rotary drum screen and corresponds to the inner layer of screen mesh. A high-pressure air inlet nozzle is also provided at the feed inlet of the rotary drum screen, and the high-pressure air inlet nozzle is connected to a variable frequency high-pressure blower. The air inlet direction of the high-pressure air inlet nozzle is at an angle to the inner layer of screen mesh.

[0013] The aforementioned novel air-forced separation multi-layer drum screen for dry and fine materials has three layers of screen mesh: an inner screen mesh, a middle screen mesh, and an outer screen mesh.

[0014] The aforementioned novel multi-layer rotary drum screen for forced air separation of dry and fine materials has a dust collection port at the top of the sealed isolation cover box corresponding to the rear end of the rotary drum screen.

[0015] Compared with the prior art, the present invention has the following technical effects:

[0016] This utility model's drum screen can accurately and cleanly separate materials using screens of the same aperture in the same layer; by setting multiple layers of screens with different apertures, materials of different particle sizes can be separated step by step, achieving multi-level material sorting; by installing a variable frequency high-pressure blower and a high-pressure air inlet, dry and fine materials can be forcibly separated, and the phenomenon of mesh clogging in each layer of screens can be effectively prevented, ensuring that the drum screen can efficiently separate materials of different particle sizes, reducing the labor intensity of workers frequently cleaning the screens, and increasing the economic benefits of enterprises. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the structure of the multi-layer screen of the drum screen of this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] The following is in conjunction with the appendix Figures 1-2 The structure and working process of this utility model will be described in detail.

[0024] A novel multi-layer rotary drum screen for forced air separation of dry and fine materials includes a rotary drum screen covered by a sealed isolation enclosure. The screen has multiple layers, with the mesh size decreasing sequentially from the inside out, and the mesh size within each layer being the same from front to back. The feed inlet 6 is located at the front of the rotary drum screen and corresponds to the inner layer of the screen. To prevent screen clogging, a high-pressure air inlet 2 is installed at the feed inlet 6, connected to a variable frequency high-pressure blower 1. The air inlet direction of the high-pressure air inlet 2 forms an angle with the inner layer of the screen. By installing a variable frequency high-pressure blower at the feed inlet end of the rotary drum screen, a strong airflow is generated through the gradually decreasing cross-sectional area of ​​the air inlet nozzles and blown into the inner layer of the screen. As the rotary drum screen rotates, each layer of screen is cleaned by the strong airflow, forcing material separation. The multi-layer rotary drum screen design, with the same mesh size within each layer from front to back, allows for precise and clean material separation. Specifically, this utility model is designed as a multi-layer drum screen, with the aperture of each layer gradually decreasing from coarse to fine from the inside out. The specific aperture size of each layer is designed according to the required particle size range of the materials to be sorted. Thus, the particle size of the oversize material flowing out of the upper outlet of the inner layer screen is the largest particle size larger than the inner layer screen aperture; the particle size of the undersize material flowing out of the lower part of the outer layer screen is the smallest particle size smaller than the outer layer screen aperture; the particle size of the material flowing out of the upper part of the outer layer screen is the particle size larger than the outer layer screen aperture but smaller than the aperture of the adjacent intermediate screens. The particle size of the material exiting from the upper outlet of each intermediate screen layer is larger than the aperture of that layer's screen but smaller than the aperture of the inner screen of the adjacent layer.

[0025] This invention uses a variable frequency high-pressure blower 1 as the forced air blowing device for a drum separator. Different wind speeds are generated depending on the blower's power and the frequency converter's control. The high-pressure air inlet 2 is the forced air blowing device for the drum separator; the strong air blown by the blower is forced through it into the inner screen 5. As the drum screen rotates, each screen layer is cleaned by the strong airflow, forcing material separation. The drum screen feed inlet 6 refers to the feed device of the drum separator. The material to be separated enters the inner screen 5 through the drum screen feed inlet 6 for step-by-step separation.

[0026] This utility model describes a novel multi-layer rotary drum screen for forced air separation of dry and fine materials. The screen has three layers: an inner screen 5, a middle screen 4, and an outer screen 3. The outer screen 3 refers to the material separation screen installed on the outermost layer of the rotary drum separator. Generally, the particle size of the undersize material flowing out from the lower part of the outer screen is the smallest particle size smaller than the outer screen aperture; the particle size of the material flowing out from the upper part of the outer screen is the particle size larger than the outer screen aperture but smaller than the aperture of the adjacent middle screen. The middle screen 4 is a multi-layer material separation screen installed in the middle of the rotary drum separator. Multiple screen layers can be installed depending on the different requirements for the particle size range of the material to be separated. Generally, the particle size of the material exiting from the upper discharge end of each middle screen is larger than the aperture of that layer's screen but smaller than the aperture of the inner screen of the adjacent layer. The inner screen 5 is the material separation screen installed on the innermost side of the rotary drum separator. Generally, the particle size of the material flowing out of the upper outlet of the inner screen is the particle size of the material that is larger than the maximum size of the inner screen mesh.

[0027] This utility model describes a novel multi-layer rotary drum screen for forced air separation of dry and fine materials. The top of the sealed isolation cover corresponding to the rear end of the rotary drum screen is equipped with a dust collection port 7. The dust collection port 7 is an environmentally friendly dust removal structure for the rotary drum separator, connected to an external dust collector interface, used to collect dust inside the rotary drum screen. This completely eliminates dust flying and lumpy splashing during the screening cycle, avoiding pollution of the working environment.

[0028] This utility model features a rotary power unit 8 installed at both ends of the drum, which drives the drum to rotate in a circular motion. The sprockets mounted on the motor and reducer drive the drum sprockets via a chain, thereby rotating the separator drum at the designed speed.

[0029] The working process of this utility model is as follows:

[0030] 1. Material feeding: The material enters the inner screen of the drum screen through the feed port.

[0031] 2. Screening Process: As the drum begins to rotate, the material is subjected to centrifugal force on the drum surface and moves along the length of the drum. Larger particles are blocked on the inner screen and flow to the rear end of the drum screen for collection. Smaller particles pass through the inner screen to the middle screen while moving along the length of the drum. The smallest particles pass through the middle screen to the outer screen while moving along the length of the drum. This achieves step-by-step separation. Simultaneously, high-pressure air from the high-pressure air inlet blows towards the inner screen 5. As the drum screen rotates, each screen layer is cleaned by the high-pressure airflow, forcing material separation.

[0032] 3. Grading and Separation: Based on the size of the sieve openings or sieve plate, the material is separated into different size grades. Smaller particles pass through the sieve openings or sieve plate, while larger particles are retained on the inner surface of the drum.

[0033] 4. Discharge: After screening, materials of different sizes move forward along the length of the drum and are discharged from the drum screen through the discharge port.

[0034] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A new type of dry fine material air forced multi-layered drum screen, comprising a drum screen, characterized in that: The drum screen is provided with a sealed isolation cover box, the screen mesh of the drum screen is provided with multiple layers, the screen mesh size is gradually reduced from inside to outside, the screen mesh size of the same layer is the same from front to back, the feeding port of the drum screen is arranged at the front end of the drum screen and corresponds to the inner layer screen mesh, and a high-pressure air inlet nozzle is further arranged at the feeding port of the drum screen, the high-pressure air inlet nozzle is connected with a variable-frequency high-pressure fan, and the air inlet direction of the high-pressure air inlet nozzle has an angle with the inner layer screen mesh.

2. The new dry fine material air forced multi-layered drum screen according to claim 1, characterized in that: The screen mesh of the drum screen is provided with three layers, namely an inner layer screen mesh, a middle layer screen mesh and an outer layer screen mesh.

3. The new type of dry fine material air forced multi-layered drum screen according to claim 2, characterized in that: A dust collecting port is arranged at the top of the sealed isolation cover box corresponding to the rear end of the drum screen.

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