Ultra-fine fraction dry method roller screening machine
By introducing a compressed air injection system into the roller screening machine and optimizing the material transmission trajectory, the problem of difficulty in efficiently screening ultra-fine particles in existing equipment is solved, and higher screening permeability and economic benefits are achieved.
Patent Information
- Application Number
- CN202422175040.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-05
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-05
AI Technical Summary
Existing coal screening equipment is difficult to achieve efficient ultra-fine-grade screening, resulting in insufficient screening rate and affecting the output rate and recovery rate of refined coal.
The compressed air injection system is introduced into the roller screening machine, and the air jet hole or nozzle is arranged below the roller screen to spray high-pressure gas to assist the screening. Combined with the material transfer trajectory design of the roller screen, it ensures the effective separation of small particles and large particles, and removes attachments through the cleaning plate.
It improves the screening effect of coal, enhances the output rate and recovery rate of refined coal, improves economic benefits, and ensures the normal operation of the roller screen.
Smart Images
Figure CN223145308U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an ultrafine particle dry roller screening machine, belonging to the technical field of dry screening equipment. Background Art
[0002] As is well known, the screening operation of coal is carried out by using a vibrating screen or a roller screen, etc. After the material is screened, oversize material and undersize material are generated. The ratio of the actually passing material through the screen holes to the theoretically passing material through the screen holes is called the screening efficiency.
[0003] For the screening operation of materials, people usually require the screening efficiency to be as large as possible, which indicates good screening effect. However, due to various factors in the screening process, only relying on the screening equipment itself often cannot achieve the ideal screening effect. Summary of the Invention
[0004] The technical problem to be solved by the utility model is to provide an ultrafine particle dry roller screening machine, which applies compressed air to the screening operation of raw coal, not only provides guarantee for the intelligent dry coal separation process, but also improves the separation effect, increases the clean coal yield and clean coal recovery rate of raw coal, and increases economic benefits.
[0005] To solve the above problems, the specific technical solution of the utility model is as follows: an ultrafine particle dry roller screening machine, in which a roller screen is arranged in a frame body, a sealing cover is arranged on the top of the roller screen, and a material channel is formed between the sealing cover and the roller screen; a feed inlet is arranged at one end of the material channel, an oversize material outlet is arranged at the other end, and an undersize material outlet is arranged at the bottom of the roller screen; a compressed air pipeline is connected under the sealing cover, and vertically downward air injection holes or nozzles are arranged on the compressed air pipeline.
[0006] The center distance between the compressed air pipeline and the screen surface of the roller screen is 250 - 800 mm.
[0007] The aperture of the air injection holes or nozzles is 2 - 15 mm, and the gas pressure for blowing is 0.3 - 0.8 MPa.
[0008] Several air injection holes or nozzles are arranged in a straight line as a group, and each group is arranged along the material running direction.
[0009] The material transmission track of the roller screen is a downward inclined straight line type, a downward concave curve type or an upward convex curve type.
[0010] Several fixing plates are arranged below the roller screen, both ends of the fixing plates in the length direction are fixed on both side surfaces of the frame body, and the length direction of the fixing plates is perpendicular to the walking direction of the material on the roller screen; several equally spaced cleaning plates are movably connected to each fixing plate, and the cleaning plates correspond to the positions of the exposed rotating shafts below the roller screen.
[0011] The ultra-fine dry roller screening machine of the present application adopts the above structure and has the following advantages:
[0012] 1. Applying compressed air to the raw coal screening operation not only improves the screening effect, enhances the coal quality, increases the economic benefits, but also provides guarantee for intelligent dry separation;
[0013] 2. The sieve trays of the roller screen make the materials have undulating movements up and down and act together with the high-pressure air, accelerating the separation of small-particle materials from large-particle materials;
[0014] 3. A cleaning plate is arranged below the frame body, which can effectively remove the undersize materials attached to the roller screen and ensure the normal operation of the roller screen. Description of the Drawings
[0015] Figure 1 It is the front view of the ultra-fine dry roller screening machine.
[0016] Figure 2 It is the side view of the ultra-fine dry roller screening machine.
[0017] Figure 3 It is the front view of the ultra-fine dry roller screening machine in Embodiment 2.
[0018] Figure 4 It is the front view of the ultra-fine dry roller screening machine in Embodiment 3. Detailed Description of the Invention Embodiment 1
[0019] As Figure 1 and Figure 2 shown, an ultra-fine dry roller screening machine is provided with a roller screen 2 inside a frame body 1. A sealing cover 3 is arranged at the top of the roller screen 2, and a material channel is formed between the sealing cover 3 and the roller screen 2. An inlet 4 is arranged at one end of the material channel, a oversize material outlet 5 is arranged at the other end, and an undersize material outlet 6 is arranged at the bottom of the roller screen 2. A compressed air pipeline 7 is connected below the sealing cover 3, and vertical air injection holes or nozzles are arranged on the compressed air pipeline 7.
[0020] In order to ensure the rapid passing of ultra-fine particles through the screen, the distance from the center of the compressed air pipeline 7 to the screen surface of the roller screen 2 is 250 - 800 mm. The aperture of the air injection holes or nozzles is 2 - 15 mm, and the gas pressure of the air injection is 0.3 - 0.8 MPa.
[0021] Several of the air injection holes or nozzles are arranged in a straight line as a group, and each group is arranged along the material running direction to ensure that the coal materials can receive uniform gas injection force, enabling the ultra-fine particles to quickly pass through the roller screen 2, thereby improving the screening efficiency.
[0022] The material transfer path of the roller screen 2 is a downward-sloping straight line. The material undulates up and down during the rotation of the screen plate, enabling the small particles attached to the surface of the large particles to quickly separate from the large particles under the dual action of the fluctuation process and the wind pressure, thereby improving the screening efficiency.
[0023] A number of fixed plates 11 are provided below the roller screen 2, and the fixed plates 11 are arranged at corresponding positions below the rotating shaft of the roller screen. Both ends of the fixed plate in the length direction are fixed to the two side surfaces of the frame 1, and the length direction of the fixed plate 11 is perpendicular to the running direction of the material; A number of equally spaced cleaning plates 12 are movably connected to each fixed plate 11, and the cleaning plates 12 correspond to the positions of the exposed rotating shafts below the roller screen 2.
[0024] The working process of the ultra-fine dry roller screening machine is as follows: The material enters from the feed inlet 4, bumps up and down along the screen surface of the roller screen, and runs towards the discharge outlet 5. During the running process, the jet pipe 7 sprays high-pressure gas onto the material. Under the dual action of bumping and jetting, the small-particle material quickly passes through the sieve holes under the combined action of gravity and blowing force and enters below the screen surface, becoming the sifted material, i.e., the undersize, to complete the screening operation. At the same time, during the running process, the cleaning plate 12 contacts the exposed rotating shaft below the roller screen 2 to remove the small particles attached to the rotating shaft, thereby improving the screening efficiency. Embodiment 2
[0025] As Figure 3 shown, the material transfer path of the roller screen 2 is a concave curve, which enables the material to stay at the concave part for a longer time, increasing the blowing time of the high-pressure gas and making the separation of small particles from large materials more thorough. The rest of the structure is the same as that of Embodiment 1. Embodiment 3
[0026] As Figure 4 shown, the material transfer path of the roller screen 2 is a convex curve, which enables the material to climb on the front-section screen plate and quickly roll down on the rear-section screen plate, increasing the rolling difference between the front and rear sections of the material and improving the screening efficiency. The rest of the structure is the same as that of Embodiment 1.
Claims
1. An ultra-fine dry roller screening machine, characterized in that: A roller screen (2) is provided inside the frame (1). A sealing cover (3) is provided at the top of the roller screen (2). A material passage is formed between the sealing cover (3) and the roller screen (2). An inlet (4) is provided at one end of the material passage, and an oversize outlet (5) is provided at the other end. A undersize outlet (6) is provided at the bottom of the roller screen (2). A compressed air pipeline (7) is connected below the sealing cover (3), and vertical downward air injection holes or nozzles are provided on the compressed air pipeline (7).
2. The ultrafine dry roller screening machine according to claim 1, wherein: The distance from the center of the compressed air pipeline (7) to the screen surface of the roller screen (2) is 250 - 800 mm.
3. The ultra-fine particle size dry roller screening machine according to claim 2, wherein: The aperture of the air injection holes or nozzles is 2 - 15 mm, and the gas pressure for blowing is 0.3 - 0.8 MPa.
4. The ultrafine dry roller screening machine according to claim 1, wherein: Several of the air injection holes or nozzles are arranged in a straight line as a group, and each group is arranged along the material running direction.
5. The ultrafine dry roller screening machine according to claim 1, characterized in that: The material transmission trajectory of the roller screen (2) is a downward inclined straight line type, a downward concave curve type or an upward convex curve type.
6. The ultrafine dry roller screening machine according to claim 1, wherein: Several fixing plates (11) are provided below the roller screen (2). The two ends in the length direction of the fixing plates are fixed on the two side surfaces of the frame (1). The length direction of the fixing plates (11) is perpendicular to the walking direction of the material on the roller screen (2). A number of equally spaced cleaning plates (12) are movably connected to each fixing plate (11), and the cleaning plates (12) correspond to the positions of the exposed rotating shafts below the roller screen (2).