Coal gangue crushing and fine screening system

Abstract

The utility model discloses a coal gangue crushing and fine screening system which comprises a crushing and fine screening device, the crushing and fine screening device is composed of a stock bin, a plate type feeding machine, a first-stage crushing machine, a second-stage crushing machine, a screening device, a main conveying belt, a finished product conveying belt and a returned material conveying belt, the plate type feeding machine is located below a discharging port of the stock bin, and the first-stage crushing machine and the second-stage crushing machine are located below the discharging port of the stock bin. The main conveying belt is located below discharging ports of the plate type feeding machine, the first-stage crushing machine and the second-stage crushing machine, the discharging end of the main conveying belt is located above the screening device, and the screening device screens crushed coal gangue according to the particle size. Compared with the prior art, the complete coal gangue crushing and fine screening production line is established, the whole process is completely automatic, manual carrying is not needed, waste of coal gangue is avoided, the coal gangue is fully and comprehensively utilized, multi-stage screening is carried out through screening equipment, various coal gangue particle products are formed, and the production efficiency is improved. And the economic benefit maximization is realized.

Description

Technical Field

[0001] This utility model relates to the field of equipment manufacturing, and in particular to a coal gangue crushing and fine screening system. Background Technology

[0002] Coal gangue is a solid waste discharged during the coal mining and washing process. It is a blackish-gray rock with a low carbon content and harder than coal that is associated with coal seams during the coal formation process.

[0003] In recent years, there has been an increasing number of technologies for utilizing coal gangue. After being transported from the coal mine to the processing plant, coal gangue is crushed using traditional crushers, typically to a size of less than 30 mm, and can then be used directly as a concrete mixing material. However, this process has the following disadvantages:

[0004] 1. Since crushed coal gangue particles contain approximately 30%-40% 0-5mm powder particles, and the process of preparing ordinary mortar and ordinary concrete requires the powder content in the coal gangue sand to be around 10%, a high powder content will affect the water absorption rate of the coal gangue sand. Therefore, it is necessary to screen out the powder particles.

[0005] 2. Existing screening methods lack precision and cannot fully and rationally utilize particles according to size grade. If 0-5mm powder particles could be screened out as products, it would not only reduce the powder content in coal gangue particles but also allow for more economical comprehensive utilization of these particles. Furthermore, among 5-30mm particles, if 5mm-15mm coal gangue could be screened out as fine material and 15mm-30mm coal gangue as aggregate, it could be precisely added according to the fine material to aggregate ratio during concrete use, resulting in better overall concrete performance.

[0006] 3. Since jaw crushers and impact crushers are usually used in the crushing process of coal gangue, the proportion of powder produced during the crushing process is relatively large, which will reduce the economic value of coal gangue.

[0007] 4. A small amount of coal gangue cannot be crushed to below 30 mm in one pass and needs to be screened out for secondary crushing. The entire crushing and screening process requires manual operation multiple times, which is very troublesome to transport.

[0008] Therefore, our company urgently needs to develop a coal gangue crushing and screening system that can screen out the crushed coal gangue according to different particle size grades so that it can be used in proportion later. At the same time, it can reduce the generation of coal gangue particles with a particle size of 0-5mm during crushing and enable the crushed coal gangue to be fully utilized. Utility Model Content

[0009] The purpose of this invention is to provide a coal gangue crushing and fine screening system that solves the above-mentioned problems, has a simple structure, and is easy to use.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is: a coal gangue crushing and fine screening system, including crushing and fine screening equipment. The crushing and fine screening equipment comprises a hopper, a plate feeder, a primary crusher, a secondary crusher, screening equipment, a main conveyor belt, a finished product conveyor belt, and a return material conveyor belt. The plate feeder is located below the discharge port of the hopper, and the main conveyor belt is located below the discharge ports of the plate feeder, the primary crusher, and the secondary crusher. The discharge port of the main conveyor belt... The end is located above the screening equipment, which has screens with 5mm, 15mm, and 30mm mesh. The screening equipment is equipped with powder discharge port, fine material discharge port, coarse material discharge port, and return particle discharge port corresponding to the screening grade. The feed end of the return particle conveyor belt is located below the return particle discharge port, and the discharge end of the return particle conveyor belt is located above the feed inlet of the secondary crusher. There are three sets of finished product conveyor belts, which are located below the powder discharge port, fine material discharge port, and coarse material discharge port, respectively.

[0011] Preferably, the plate feeder is provided with a receiving hopper at the bottom, and the discharge port of the receiving hopper is located above the main conveyor belt.

[0012] Preferably, both the primary and secondary crushers are double-toothed roll crushers.

[0013] Preferably, the screening equipment is a multi-layer grading vibrating screening equipment, which has screens with 5mm, 15mm and 30mm screen holes.

[0014] Preferably, the return material conveyor belt is also equipped with an iron remover.

[0015] Preferably, the main conveyor belt is a two-section conveyor belt, with the front section being a horizontal conveyor belt and the rear section being a steeply inclined conveyor belt. The horizontal conveyor belt is located below the discharge ports of the plate feeder, the primary crusher, and the secondary crusher.

[0016] Preferably, there are three sets of crushing and fine screening equipment, which operate in parallel, with the three finished product conveyor belts located below the corresponding product discharge ports of the three screening equipment.

[0017] Compared with the prior art, the advantages of this utility model are:

[0018] (1) This utility model establishes a complete coal gangue crushing and fine screening production line. Coal gangue is temporarily stored in a silo. Transport vehicles can pull coal gangue out of the coal silo and pour it into the silo. The coal gangue is fed into a plate feeder through the discharge port at the bottom of the silo. The plate feeder feeds the coal gangue into the primary crusher for crushing. After crushing, it is conveyed to the screening equipment by the main conveyor belt for multi-stage screening. Through the screening equipment, three types of coal gangue particle products with particle sizes of 0-5mm, 5mm-15mm, and 15mm-30mm are screened. Coal gangue particles larger than 30mm can be conveyed to the secondary crusher by the return conveyor belt for further crushing, and then conveyed back to the screening machine by the main conveyor belt for multi-stage screening. The entire process is fully automated, requiring no manual handling and eliminating coal gangue waste, thus achieving full and comprehensive utilization of coal gangue. The screening equipment enables multi-stage screening of coal gangue according to particle size, resulting in a variety of coal gangue particle products and maximizing economic benefits. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the complete set of equipment of this utility model.

[0021] In the diagram: 1. Hopper; 2. Plate feeder; 3. Primary crusher; 4. Secondary crusher; 5. Main conveyor belt; 51. Horizontal conveyor belt; 52. Inclined conveyor belt; 6. Screening equipment; 61. Powder discharge port; 62. Fine material discharge port; 63. Coarse material discharge port; 64. Returned particle discharge port; 7. Finished product conveyor belt; 8. Returned material conveyor belt; 9. Receiving hopper; 10. Magnetic separator. Detailed Implementation

[0022] The present invention will be further described below: A coal gangue crushing and fine screening system, including crushing and fine screening equipment, see [link to relevant documentation]. Figure 1The crushing and screening equipment 6 comprises a hopper 1, a plate feeder 2, a primary crusher 3, a secondary crusher 4, a screening device 6, a main conveyor belt 5, a finished product conveyor belt 7, and a return material conveyor belt 8. The plate feeder 2 is located below the discharge port of the hopper 1. The main conveyor belt 5 is located below the discharge ports of the plate feeder 2, the primary crusher 3, and the secondary crusher 4. The discharge end of the main conveyor belt 5 is located above the screening device 6. The screening device 6 has screens with 5mm, 15mm, and 30mm mesh openings. The screening device 6 is equipped with powder discharge ports 61, fine material discharge ports 62, coarse material discharge ports 63, and return material particle discharge ports 64, corresponding to the screening grades. The feed end of the return material conveyor belt 8 is located above the return material particle discharge port 64. Below the particle discharge port 64, the discharge end of the return conveyor belt 8 is located above the feed port of the secondary crusher 4. The screening equipment 6 screens the crushed coal gangue into four grades according to particle size: 0-5mm, 5mm-15mm, 15mm-30mm, and greater than 30mm. The feed end of the return conveyor belt 8 is located below the return particle discharge port for coal gangue particles larger than 30mm. There are three sets of finished product conveyor belts 7, located below the powder discharge port for 0-5mm coal gangue particles, the fine material discharge port for 5mm-15mm coal gangue particles, and the coarse material discharge port for 15mm-30mm coal gangue particles, respectively. This realizes the separate feeding of various coal gangue products and their conveyor belts to the corresponding production stages. This utility model establishes a complete coal gangue crushing and fine screening production line. Coal gangue is temporarily stored in a silo 1. Transport vehicles can pull the coal gangue from the coal bunker and pour it into silo 1. The coal gangue is fed through the discharge port at the bottom of silo 1 onto a plate feeder 2, which then feeds it into a primary crusher 3 for crushing. After crushing, it is conveyed via the main conveyor belt 5 to a screening device 6 for multi-stage screening. The screening device 6 separates the coal gangue into 0-5mm, 5mm-... The coal gangue particles are graded into four sizes: 15mm, 15mm-30mm, and larger than 30mm. These sizes (0-5mm, 5mm-15mm, and 15mm-30mm) correspond to three different coal gangue products. These are conveyed via finished product conveyor belt 7 to the next production line for further processing or bagging and sale. Coal gangue particles larger than 30mm are conveyed via return conveyor belt 8 to the secondary crusher 4 for further crushing, and then conveyed again via main conveyor belt 5 to the screening machine for multi-stage screening. The entire process is fully automated, requiring no manual handling and eliminating coal gangue waste, thus achieving full and comprehensive utilization of coal gangue. The screening equipment 6 enables multi-stage screening of coal gangue according to particle size, resulting in various coal gangue particle products and maximizing economic benefits.

[0023] Coal gangue particles with a diameter of 5mm-15mm can be used as fine aggregate in concrete; coal gangue particles with a diameter of 15mm-30mm can be used as aggregate in concrete. After fine screening, coal gangue particles can be used as fine aggregate and aggregate respectively, and can be freely proportioned according to the needs of concrete production to meet the performance requirements of concrete production.

[0024] Coal gangue particles of 0-5mm can be used as an auxiliary additive in concrete mixing; they can also be used as fly ash as an additive in the preparation of coal gangue-bonded or cementitious materials. To improve its economic value, coal gangue dust smaller than 0.5mm can be separated by air separation equipment, bagged, and sold as raw material for low-calorific-value coal.

[0025] Because there are gaps between the chain plates of the plate feeder 2, some smaller coal gangue will fall through the gaps. Therefore, the plate feeder 2 used in this invention not only has the function of feeding, but also plays a role in screening the coal gangue raw materials. Some smaller particles can be directly conveyed to the screening equipment 6 without crushing, reducing the generation of small coal gangue particles and reducing the workload of the crusher. Therefore, this invention provides a receiving hopper 9 at the bottom of the plate feeder 2. The discharge port of the receiving hopper 9 is located above the main conveyor belt 5. The receiving hopper 9 is used to receive small coal gangue particles falling from the plate feeder 2, which can be directly conveyed to the screening equipment 6 for multi-stage screening via the main conveyor belt 5.

[0026] Both the primary crusher 3 and the secondary crusher 4 are 2PGC1200X1000 double toothed roller crushers. The two toothed rollers of the double toothed roller crusher crush the coal gangue to below 30mm. The gap between the toothed rollers of the double toothed roller crusher can be adjusted by the hydraulic system to achieve a satisfactory output particle size. At the same time, the double toothed roller crushing method can reduce the generation of coal gangue powder below 5mm, and can control the content of 0-5mm coal gangue powder particles to within 10%.

[0027] The screening equipment 6 adopts a multi-layer graded vibrating screen with screens having 5mm, 15mm, and 30mm mesh openings. It can screen the crushed coal gangue into four grades according to particle size: 0-5mm, 5mm-15mm, 15mm-30mm, and larger than 30mm.

[0028] The return material conveyor belt 8 is also equipped with an iron remover 10, which can remove iron-containing impurities from the coal gangue particles.

[0029] Since the coal gangue needs to be transported to the silo 1 by transport vehicles, and since both the silo 1 and the crusher are below ground level, the main conveyor belt 5 is divided into two sections: a horizontal conveyor belt 51 at the front and a steeply inclined conveyor belt 52 at the rear. The horizontal conveyor belt 51 is located below the discharge ports of the plate feeder 2, the primary crusher 3, and the secondary crusher 4. It is used to receive the material from the bottom hopper 9 of the plate feeder 2 and the coal gangue particles after crushing by the crusher. Then, it is lifted and transported to the screening machine by the steeply inclined conveyor belt 52 at the rear. After screening, coal gangue particles of different sizes can be transported to the next stage by the finished product conveyor belt 7 on the ground. Coal gangue particles larger than 30mm that have not been crushed to the required size can be transported to the secondary crusher 4 above the return conveyor belt 8 for further crushing.

[0030] There are three sets of the crushing and screening equipment 6, which operate in parallel. (See below) Figure 2 This greatly increases the output of crushed coal gangue particles. The three finished product conveyor belts 7 are located below the corresponding product discharge ports of the three screening devices 6. The same type of coal gangue particle product from the three sets of crushing and fine screening devices 6 can be shared through the same finished product conveyor belt 7, which reduces equipment investment costs and increases working efficiency.

[0031] The above provides a detailed description of the coal gangue crushing and fine screening system provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, based on the idea of ​​this utility model, there will be changes in the specific implementation and application scope. Changes and improvements to this utility model are possible without exceeding the concept and scope specified in the appended claims. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A coal gangue crushing and fine screening system, comprising crushing and fine screening equipment, characterized in that: The crushing and screening equipment comprises a hopper, a plate feeder, a primary crusher, a secondary crusher, a screening device, a main conveyor belt, a finished product conveyor belt, and a return material conveyor belt. The plate feeder is located below the discharge port of the hopper. The main conveyor belt is located below the discharge ports of the plate feeder, the primary crusher, and the secondary crusher. The discharge end of the main conveyor belt is located above the screening device. The screening device has screens with 5mm, 15mm, and 30mm mesh sizes. The screening device is equipped with powder discharge ports, fine material discharge ports, coarse material discharge ports, and return material particle discharge ports corresponding to the screening grades. The feed end of the return material conveyor belt is located below the return material particle discharge port, and the discharge end of the return material conveyor belt is located above the feed port of the secondary crusher. The finished product conveyor belt has three sets located below the powder discharge port, fine material discharge port, and coarse material discharge port, respectively.

2. The coal gangue crushing and fine screening system according to claim 1, characterized in that: The plate feeder is equipped with a receiving hopper at the bottom, and the discharge port of the receiving hopper is located above the main conveyor belt.

3. The coal gangue crushing and fine screening system according to claim 1, characterized in that: Both the primary and secondary crushers are double-toothed roll crushers.

4. The coal gangue crushing and fine screening system according to claim 1, characterized in that: The screening equipment is a multi-layer grading vibrating screen.

5. The coal gangue crushing and fine screening system according to claim 1, characterized in that: The return material conveyor belt is also equipped with an iron remover.

6. The coal gangue crushing and fine screening system according to claim 1, characterized in that: The main conveyor belt is divided into two sections: a horizontal conveyor belt at the front and a steeply inclined conveyor belt at the rear. The horizontal conveyor belt is located below the discharge ports of the plate feeder, the primary crusher, and the secondary crusher.

7. The coal gangue crushing and fine screening system according to claim 1, characterized in that: There are three sets of crushing and fine screening equipment, which operate in parallel. The three finished product conveyor belts are located below the corresponding product discharge ports of the three screening equipment.

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