A combined screen device for raw coal classification

Abstract

The utility model discloses a kind of combined screen devices for raw coal grading, it is related to solid material screening technical field, including shell and drive shell vibration vibrating mechanism, the shell upper portion is fixed with primary sieve plate, the primary sieve plate is designed as ladder structure, the shell inside is fixed with secondary sieve plate below each ladder of primary sieve plate. The utility model is by being set as ladder structure to primary sieve plate, when primary coal block rolls on the ladder structure of primary sieve plate, some coal block with crack will be broken away using its own gravitational potential energy, to avoid these primary coal block fragmentation in the process of subsequent transport, improve primary coal block quality, secondary sieve plate is set below each ladder of primary sieve plate, to form multilayer structure, can prevent secondary sieve plate blockage, guarantee secondary screening effect.

Description

Technical Field

[0001] This utility model relates to the field of solid material screening technology, specifically a combined screening device for raw coal grading. Background Technology

[0002] During mining and processing, raw coal typically contains various sizes due to its natural heterogeneity. To meet the specific size requirements of subsequent washing, transportation, combustion, and sales stages, effective grading of raw coal is necessary. Screening, as a crucial step in raw coal grading, directly impacts the quality and utilization efficiency of coal products. The industry widely employs screening devices to separate raw coal according to particle size, thereby achieving rational resource utilization.

[0003] Common raw coal screening equipment mainly includes vibrating screens, drum screens, and fixed screens. These devices use mechanical vibration, rotation, or gravity to move the coal material on the screen surface, allowing smaller particles to pass through the screen openings for grading. For example, some vibrating screens use a motor-driven vibrator to generate reciprocating vibration, propelling the coal material forward in a jumping motion on the screen surface, thus achieving the separation of different particle sizes. Under certain conditions, this type of equipment can meet basic grading requirements and has become a commonly used device in coal processing.

[0004] Existing common raw coal screening equipment typically uses flat screens. The primary coal blocks obtained from these screens often contain coal blocks with gaps. These coal blocks are prone to breakage due to stress during subsequent transportation, leading to a decrease in the quality of the primary coal blocks. Secondly, secondary screens contain a large amount of coal powder, and the particles are prone to sticking together, causing coal blockage and affecting the efficiency of secondary screening. Utility Model Content

[0005] Based on this, the purpose of this utility model is to provide a combined screening device for raw coal grading, so as to solve the technical problems of existing common raw coal screening equipment, which is usually a flat screen plate, and the primary coal blocks obtained by screening contain coal blocks with gaps. These coal blocks are easily broken due to stress during subsequent transportation, resulting in a reduction in the quality of primary coal blocks. The secondary screen plate contains more coal powder, and the particles are easy to stick together, causing coal block blockage and affecting the efficiency of secondary screening.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a combined screening device for raw coal grading, comprising a shell and a vibration mechanism for driving the shell to vibrate. A primary screen plate is fixed on the upper part of the shell. The primary screen plate is designed as a stepped structure. A secondary screen plate is fixed below each step of the primary screen plate inside the shell. The end of each secondary screen plate away from the primary screen plate is flush with the secondary screen plate. A bottom plate is fixed below the bottommost secondary screen plate inside the shell. A secondary discharge port that cooperates with the bottom plate is provided at the end of the bottom plate of the shell.

[0007] By adopting the above technical solution, coal blocks are graded.

[0008] The present invention is further configured such that a chamber is provided inside the outer shell at the end of the secondary sieve plate, and a dust suction pipe communicating with the chamber is connected to the outside of the outer shell.

[0009] By adopting the above technical solution, coal blocks and coal powder can be separated.

[0010] The present invention is further configured such that the dust suction pipe is composed of several branch pipes and a main pipe, the several branch pipes are evenly distributed in the chamber, and the several branch pipes converge into the main pipe.

[0011] By adopting the above technical solution, coal powder is adsorbed and collected.

[0012] The present invention is further configured such that the vibration mechanism includes a base, four fixed rods are fixed on the top of the base, a fixed sleeve is provided on the outer side of the outer shell and movably sleeved on the fixed rods, a spring is also sleeved on the outer side of the fixed rod below the fixed sleeve, a polarizing plate is fixed on one side of the outer shell, a limit groove is formed on the polarizing plate, a motor is also installed on the top of the base, the output end of the motor is connected to a wheel through a bearing bracket, a motion shaft is fixed at an eccentric position on the outer side of the wheel, and the motion shaft moves within the limit groove.

[0013] By adopting the above technical solution, the machine is controlled to vibrate and screen coal blocks.

[0014] The present invention is further configured such that both the primary sieve plate and the secondary sieve plate are inclined downwards, and the bottom plate is also inclined in the same direction as the secondary sieve plate.

[0015] By adopting the above technical solution, coal lumps can be screened more easily.

[0016] In summary, the present invention has the following main advantages: This invention features a stepped structure for the primary screen plate. As primary coal blocks roll down this stepped structure, their gravitational potential energy breaks up any cracked blocks, preventing them from breaking apart during subsequent transportation and improving their quality. A secondary screen plate is positioned below each step of the primary screen plate, creating a multi-layered structure that prevents clogging and ensures effective secondary screening. Furthermore, as the coal blocks screened from the secondary screen plate fall, coal dust is sucked away by a side suction pipe, separating the dust from the secondary coal blocks and maintaining their quality. The dust can also be collected. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall front structure of this utility model; Figure 2 This is a schematic diagram of the overall rear structure of this utility model; Figure 3 This is a schematic diagram of the internal structure of the present invention; Figure 4 This is a schematic diagram of the eccentric rotating shaft structure of this utility model.

[0018] In the diagram: 1. Outer shell; 2. Polarizing film; 3. Fixing rod; 4. Fixing sleeve; 5. Spring; 6. Bearing frame; 7. Motor; 8. Base; 9. Dust suction pipe; 10. Primary sieve plate; 11. Secondary discharge port; 12. Chamber; 13. Secondary sieve plate; 14. Base plate; 15. Rotary wheel; 16. Limiting groove; 17. Motion shaft. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] The embodiments of this utility model will be described below based on its overall structure.

[0021] A combined screening device for raw coal grading, such as Figures 1 to 4As shown, the device includes an outer shell 1 and a vibration mechanism that drives the outer shell to vibrate. The outer shell 1 serves as the supporting foundation for the entire device and is typically made of metal, possessing sufficient structural strength and stability. A primary screen plate 10 is fixed to the upper part of the outer shell 1. The primary screen plate 10 is used to screen primary coal blocks. The primary screen plate 10 is designed with a stepped structure. Coal materials that meet the specifications of primary coal blocks fall step by step on the primary screen plate 10 until they reach the bottom of the steps and are collected there. Inside the outer shell 1, below each step of the primary screen plate 10, a secondary screen plate 13 is fixed. The secondary screen plate 13 is used to screen secondary coal blocks. The end of each secondary screen plate 13 away from the primary screen plate 10 is flush. Inside the outer shell 1, below the bottom secondary screen plate 13, a bottom plate 14 is fixed. The bottom plate 14 is used to receive the coal blocks screened by the secondary screen plate 13. At the end of the bottom plate 14, the outer shell 1 is provided with a secondary discharge port 11 that cooperates with it. The secondary discharge port 11 is used to output secondary coal blocks. The outer shell 1 has a chamber 12 located at the end of the secondary screen plate 13. The chamber 12 is used for the passage of secondary coal blocks. The outer shell 1 is connected to a dust suction pipe 9 that communicates with the chamber 12. The dust suction pipe 9 consists of several branch pipes and a main pipe. The branch pipes are evenly distributed in the chamber 12 and converge into the main pipe. The dust suction pipe 9 is used to adsorb coal powder in the secondary coal blocks through a suction device connected to the main pipe. The vibration mechanism includes a base 8, which supports the entire machine. Four fixing rods 3 are fixed on the top of the base 8. The fixing rods 3 are used to limit the vibration direction of the machine to prevent deviation. The outer shell 1 is provided with a fixing sleeve 4 that is movably sleeved on the fixing rods 3. The fixing sleeve 4 is used to fix the fixing rods 3 to the outer shell 1. A spring 5 is fitted on the outside of the fixed rod 3, below the fixed sleeve 4. The spring 5 supports the machine vibration. A polarizing plate 2 is fixed on one side of the outer shell 1. The polarizing plate 2 is used to adjust the vibration direction to up and down. A limiting groove 16 is opened on the polarizing plate 2. A motor 7 is also installed on the top of the base 8. The motor 7 provides power for the machine vibration. The output end of the motor 7 is connected to a rotating wheel 15 through a bearing bracket 6. The rotating wheel 15 outputs the machine vibration power provided by the motor 7. A motion shaft 17 is fixed at an eccentric position on the outside of the rotating wheel 15. The motion shaft 17 moves within the limiting groove 16 and is used to control the up and down vibration of the machine through the power output by the rotating wheel 15. The primary screen plate 10 and the secondary screen plate 13 are both inclined downwards. The bottom plate 14 is also inclined in the same direction as the secondary screen plate 13 to accelerate the coal screening efficiency.

[0022] The working principle of this utility model is explained in detail as follows: First, the motor 7 and the suction device are started. The motor 7 outputs power to the rotor 15. The rotor 15 drives the motion shaft 17, located at the eccentric position of the rotor 15, to rotate. The motion shaft 17 drives the limiting groove 16 to vibrate up and down, causing the machine to vibrate up and down. Then, the uppermost primary screen plate 10 screens all coal blocks through vibration. Some coal blocks fall into the secondary screen plate 13 through the holes of the uppermost primary screen plate 10, while the rest pass through the next primary screen plate 10. Due to gravitational potential energy, some of the coal blocks containing cracks break and fall through the holes into the secondary screen plate 13. The above operation is repeated until the coal blocks reach the primary screen plate. 10. The last layer, the coal blocks that have not yet fallen through the holes, are the first-level coal blocks obtained by screening. For the coal blocks that pass through the holes of the first-level screen plate, they fall to the second-level screen plate 13. Due to the gravitational potential energy, the coal blocks with cracks break apart and finally fall through the holes of the second-level screen plate 13 to the bottom plate 14. The coal blocks located on the bottom plate 14 are output from the second-level discharge port 11 to obtain the screened second-level coal blocks. For the coal blocks that do not pass through the holes of the second-level screen plate 13, they are transmitted to the chamber 12 by vibration. The suction device generates suction and adsorbs coal powder through the dust collection pipe into the dust collection pipe 9. All the coal powder adsorbed by the dust collection pipe 9 is collected in the main pipe, and the coal powder is output and collected.

[0023] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A combined screening device for raw coal grading, comprising a shell (1) and a vibration mechanism for driving the shell to vibrate, characterized in that: The upper part of the outer shell (1) is fixed with a primary screen plate (10). The primary screen plate (10) is designed as a stepped structure. Inside the outer shell (1), a secondary screen plate (13) is fixed below each step of the primary screen plate (10). The end of each secondary screen plate (13) away from the primary screen plate (10) is flush. Inside the outer shell (1), a bottom plate (14) is fixed below the bottom secondary screen plate (13). At the end of the bottom plate (14), the outer shell (1) is provided with a secondary discharge port (11) that matches it.

2. The combined screening device for raw coal grading according to claim 1, characterized in that: The outer shell (1) has a chamber (12) located at the end of the secondary sieve plate (13) inside, and a dust suction pipe (9) connected to the outer shell (1) is connected to the chamber (12).

3. A combined screening device for raw coal grading according to claim 2, characterized in that: The suction pipe (9) consists of several branch pipes and a main pipe. The branch pipes are evenly distributed in the chamber (12) and the branch pipes converge into the main pipe.

4. A combined screening device for raw coal grading according to claim 1, characterized in that: The vibration mechanism includes a base (8), four fixed rods (3) are fixed on the top of the base (8), a fixed sleeve (4) is provided on the outside of the outer shell (1) and is movably sleeved on the fixed rods (3), a spring (5) is also sleeved on the outside of the fixed rods (3) below the fixed sleeve (4), a polarizer (2) is fixed on one side of the outer shell (1), a limit groove (16) is opened on the polarizer (2), a motor (7) is also installed on the top of the base (8), the output end of the motor (7) is connected to a wheel (15) through a bearing bracket (6), a motion shaft (17) is fixed at an eccentric position on the outside of the wheel (15), and the motion shaft (17) moves in the limit groove (16).

5. A combined screening device for raw coal grading according to claim 1, characterized in that: Both the primary sieve plate (10) and the secondary sieve plate (13) are inclined downwards, and the bottom plate (14) is also inclined in the same direction as the secondary sieve plate (13).

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