jaw crusher

Abstract

The present application relates to the technical field of crusher, specifically to a jaw type counter-rotating screening and crushing machine, which comprises a screening device, a crusher and a transition bin, the lower end of the screening device is installed on the upper end of the crusher, the upper end of the transition bin is installed on the lower end of the crusher, the screening device, the crusher and the transition bin all have two openings in up and down directions, and the screening device, the crusher and the transition bin are communicated with each other, a counter-rotating crushing assembly is installed in the crusher, the counter-rotating crushing assembly comprises a driving roller and a driven roller, the driving roller and the driven roller are rotationally connected with the crusher, a speed reducer motor is installed on the surface of the crusher, the speed reducer motor is used to drive the driving roller to rotate, the driving roller drives the driven roller to rotate through gear transmission, and the purpose of the present application is to solve the problem that it is inconvenient to manually clean the ash cooler ash hopper and the coking block in the ash conveying pipeline.

Description

Technical Field

[0001] This invention relates to the field of crusher technology, specifically to a jaw counter-rotating screen crusher. Background Technology

[0002] Existing thermal power plants generally suffer from coking problems inside the economizer due to the variety of coal types burned and the changes in operating conditions. After the boiler is blown out, the coking is blown into the ash hopper, clogging the filter screen of the ash conveying silo pump and the ash conveying pipeline, causing the ash conveying to be unable to be carried out normally. At present, the main problems are the blockage of the silo pump inlet filter screen and the blockage of the ash conveying pipeline, which prevents the normal ash conveying.

[0003] Coke blocks the inlet filter screen of the silo pump, preventing the upper ash from entering the pump and being transported away in time. The ash accumulates in the ash hopper at the bottom of the economizer, making it impossible to transport ash. After long-term operation, the accumulated ash and coke will increase, seriously affecting the safe operation of the equipment. Currently, the only way to transport ash is by manual means. For the silo pump inlet filter screen blockage, the filter screen manhole is removed and the ash is manually discharged. After the ash is discharged to the ash hopper below, it is discharged to the ground through a temporary ash conveying pipe, and finally it is manually cleaned.

[0004] This method of treatment has several drawbacks. It involves a large amount of manual ash conveying work, a harsh working environment, and dust generation when ash is manually conveyed to the ground. The dust drifts into the surrounding air and is sucked into the primary ventilation fan, causing wear and tear on the fan. The dust also enters the oil through the oil station's breather, posing certain equipment safety risks. Summary of the Invention

[0005] The purpose of this invention is to provide a jaw counter-rotating screening and crushing machine to solve the problem of inconvenience in manually cleaning the economizer ash hopper and ash conveying pipelines where coke lumps have formed.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A jaw counter-rotating screening crusher includes a screen, a crusher, and a transition chamber. The lower end of the screen is installed at the upper end of the crusher, and the upper end of the transition chamber is installed at the lower end of the crusher. The screen, crusher, and transition chamber each have two openings, one at the top and one at the bottom, and are interconnected. The crusher contains a counter-rotating crushing assembly.

[0008] Preferably, the counter-rotating crushing assembly includes a driving roller and a driven roller, both of which are rotatably connected to the crusher. A geared motor is mounted on the surface of the crusher, which drives the driving roller to rotate. The driving roller drives the driven roller to rotate through gear transmission.

[0009] Preferably, the inner wall of the sieve is equipped with a filter screen, which is used to sieve the raw ash.

[0010] Preferably, the filter screen is inclined and faces directly below the opening on the screener, and there is a gap between the lowest point of the filter screen and the side wall of the screener.

[0011] Preferably, a flow divider is fixedly connected to the inner wall of the sieve, one end of which is fixedly connected to the end of the filter screen at the lowest point, and the other end divides the lower opening of the sieve into left and right parts.

[0012] Preferably, the inner wall of the sieve is fixedly connected to an inclined first guide plate, an inclined second guide plate, and an inclined third guide plate. There is a gap between the highest point of the first guide plate and the side wall of the sieve, and this gap is smaller than the gap between the lowest point of the filter screen and the side wall of the sieve. Similarly, there is a gap between the highest point of the second guide plate and the side wall of the sieve, and this gap is smaller than the gap between the highest point of the first guide plate and the side wall of the sieve. The highest point of the third guide plate is connected to the side wall of the sieve. The length of the first guide plate is greater than the length of the second guide plate, and the length of the second guide plate is greater than the length of the third guide plate.

[0013] Preferably, a partition plate is fixedly connected to the inner wall of the crusher, which divides the internal space of the crusher into a crushing chamber and a transition chamber. The counter-rotating crushing assembly is located in the crushing chamber. The upper opening of the crusher includes a coke inlet and a raw ash inlet. The raw ash inlet is connected to the transition chamber, and the coke inlet is connected to the crushing chamber. The left part of the lower opening of the screen is aligned with the raw ash inlet, and the right part of the lower opening of the screen is aligned with the coke inlet.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The designed jaw counter-rotating screening and crushing machine integrates screening and crushing functions, which can efficiently process hard coke lumps in the economizer ash hopper, significantly reduce the frequency of system blockage, improve the stability and efficiency of the ash conveying system, and reduce the reliance on high-intensity manual cleaning operations due to the effective replacement of mechanized screening and crushing with manual blockage clearing operations, thereby enhancing the stability and economy of system operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a front sectional view of the sieve of the present invention;

[0018] Figure 3 This is a top sectional view of the crusher of the present invention;

[0019] Figure 4 This is a top view of the crusher of the present invention.

[0020] In the diagram: 1. Screener; 2. Filter screen; 3. Diverter plate; 4. First guide plate; 5. Second guide plate; 6. Third guide plate; 7. Baffle; 8. Inspection window; 9. Crusher; 10. Separator plate; 11. Drive roller; 12. Gear motor; 13. Transition bin; 14. Driven roller; 15. Coke block inlet; 16. Raw ash inlet. Detailed Implementation

[0021] 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.

[0022] Please see Figures 1 to 4 The present invention provides a technical solution.

[0023] The jaw counter-rotating screen crusher includes a screen 1, a crusher 9, and a transition chamber 13. The lower end of the screen 1 is installed at the upper end of the crusher 9, and the upper end of the transition chamber 13 is installed at the lower end of the crusher 9. The screen 1, crusher 9, and transition chamber 13 all have two openings, one at the top and one at the bottom, and they are interconnected. The crusher 9 is equipped with a counter-rotating crushing component. Coke deposits inside the economizer are first passed through the screen 1 after boiler soot blowing, and then through the crusher 9, where they are crushed by the counter-rotating crushing component. This avoids large pieces of coke clogging the filter screen of the ash conveying silo pump and the ash conveying pipe, and also eliminates the need for manual cleaning of coke deposits that can cause blockages, making it convenient to use.

[0024] The counter-rotating crushing assembly includes a drive roller 11 and a driven roller 14. Both the drive roller 11 and the driven roller 14 are rotatably connected to the crusher 9. By controlling the distance between the drive roller 11 and the driven roller 14, the size of the crushed coke can be controlled. A geared motor 12 is installed on the surface of the crusher 9. The geared motor 12 is used to drive the drive roller 11 to rotate. The drive roller 11 drives the driven roller 14 to rotate in opposite directions through gear transmission. The geared motor 12 includes a reducer and a motor. The rotational movement refers to the two components rotating in opposite directions, that is, the drive roller 11 and the driven roller 14 rotating in opposite directions. When the coke enters the counter-rotating crushing assembly, it is crushed by extrusion and shearing forces.

[0025] The inner wall of the screener 1 is equipped with a filter screen 2 with a pore size of φ10mm, which is used to screen raw ash. By setting the filter screen 2, it can efficiently separate raw ash with smaller particle size, allowing it to directly enter the transition chamber 13, while intercepting large coke blocks to enter the crusher 9.

[0026] The filter screen 2 is inclined and directly below the opening of the screen 1, ensuring that the material falling from the opening of the screen 1 can fall onto the filter screen 2. There is a gap between the lowest point of the filter screen 2 and the side wall of the screen 1, so that the intercepted coke blocks fall down through this gap. Specifically, the material enters the screen 1 through the upper opening of the screen 1 and falls onto the filter screen 2. The raw ash with a smaller particle size passes directly through the filter screen 2, while the large coke blocks roll along the surface of the filter screen 2 and fall down through the gap between the lowest point of the filter screen 2 and the side wall of the screen 1, so that the raw ash and coke blocks are separated and both fall down.

[0027] A flow divider 3 is fixedly connected to the inner wall of the sieve 1. One end of the flow divider 3 is fixedly connected to the end of the filter screen 2 at the lowest point, and the other end divides the lower opening of the sieve 1 into left and right parts. By setting the flow divider 3, the raw ash and coke blocks are separated when they fall.

[0028] An inclined first guide plate 4, a inclined second guide plate 5, and an inclined third guide plate 6 are fixedly connected to the inner wall of the screen 1. A gap exists between the highest point of the first guide plate 4 and the side wall of the screen 1, and this gap is smaller than the gap between the lowest point of the filter screen 2 and the side wall of the screen 1. Similarly, a gap exists between the highest point of the second guide plate 5 and the side wall of the screen 1, and this gap is smaller than the gap between the highest point of the first guide plate 4 and the side wall of the screen 1. The highest point of the third guide plate 6 and the side wall of the screen 1 are also connected. The walls are connected, and the length of the first guide plate 4 is greater than the length of the second guide plate 5, which in turn is greater than the length of the third guide plate 6. By setting the first guide plate 4, the second guide plate 5, and the third guide plate 6, large coke blocks will fall onto the first guide plate 4, the second guide plate 5, or the third guide plate 6 after falling from the gap between the lowest point of the filter screen 2 and the side wall of the screener 1. Because of their different lengths, the first guide plate 4, the second guide plate 5, and the third guide plate 6 will guide the coke blocks falling onto them to fall from different horizontal positions, which helps to prevent the coke blocks from falling from a single point and the actual working surface of the counter-rotating crushing component from not being fully utilized.

[0029] A baffle 7 is fixedly connected to the inner wall of the screener 1. The baffle 7 is used to prevent the falling coke block from running out of the position above the counter-rotating crushing component.

[0030] A partition plate 10 is fixedly connected to the inner wall of the crusher 9. The partition plate 10 divides the internal space of the crusher 9 into a crushing chamber and a transition chamber. The counter-rotating crushing component is located in the crushing chamber. The upper opening of the crusher 9 includes a coke inlet 15 and a raw ash inlet 16. The raw ash inlet 16 is connected to the transition chamber, and the coke inlet 15 is connected to the crushing chamber. The left part of the lower opening of the screen 1 is aligned with the raw ash inlet 16, and the right part of the lower opening of the screen 1 is aligned with the coke inlet 15. With this arrangement, the raw ash from the left part of the lower opening of the screen 1 falls into the transition chamber of the crusher 9 and then directly falls into the transition bin 13. The coke from the right part of the lower opening of the screen 1 falls into the crushing chamber of the crusher 9, is crushed, and then falls into the transition bin 13, thus preventing the raw ash from falling onto the counter-rotating crushing component and adhering to it.

[0031] The surface of the screener 1 is provided with a maintenance window 8 for inspection.

[0032] Through the shearing action of the counter-rotating crushing components, the intercepted coke lumps are crushed to a particle size of ≤5mm, ensuring compliance with the ash conveying system's passage requirements. The crushed particles are then introduced into the ash conveying silo pump via the lower transition bin 13, completing an efficient operation process from screening to crushing to conveying. Compared with traditional equipment, the jaw counter-rotating screen crusher integrates screening and crushing functions, featuring a modular structure, small footprint, and convenient installation. Furthermore, by optimizing the tooth shape and crushing parameters, it can efficiently process hard coke lumps in the economizer ash hopper. Its integrated design not only reduces equipment space requirements but also significantly reduces system blockage frequency, improving the stability and efficiency of the ash conveying system. Especially in dealing with complex ash and slag problems, the jaw counter-rotating screen crusher demonstrates leading technological advantages, providing strong technical support for the optimization of thermal power plant ash conveying systems. Moreover, the application of the jaw counter-rotating screen crusher significantly reduces the operating costs and energy consumption of thermal power plant ash conveying systems. In terms of labor input, the total cost has been reduced by 98.1%, thanks to the effective replacement of manual unblocking operations by mechanized screening and crushing. This has reduced reliance on intensive manual labor and saved significant operating costs. Regarding energy consumption, the integrated design of the crusher for screening, crushing, and conveying has significantly improved the efficiency of the ash conveying system, reducing total system energy consumption by 8.3% and unit ash conveying energy consumption by 16.7%. Although the crusher itself increases power consumption, its optimized particle size treatment effectively reduces the frequency of pipe blockage and the burden of manual cleaning, further reducing overall system energy consumption. Simultaneously, the optimized ash conveying flow rate has increased by 39%, further enhancing the system's stability and economy. After the upgrade, the ash conveying system has significantly improved in terms of economy, stability, and energy efficiency, not only meeting current requirements for high efficiency and environmental protection but also providing strong support for the green energy development of thermal power plants, aligning with the direction of sustainable development.

[0033] The application of jaw counter-rotating screen crushers has significantly improved the safety and environmental friendliness of ash conveying systems, providing important support for the safe operation and green development of thermal power plants. Through mechanized screening and crushing operations, unplanned unit shutdowns caused by blockages are avoided, which is of great significance for ensuring stable power supply. The enclosed design of the equipment effectively reduces dust emissions, significantly improves the environmental quality of the plant area and surrounding air conditions, and demonstrates a positive contribution to environmental protection. In addition, mechanized processing greatly reduces high-risk manual operations and lowers the frequency of workers' exposure to harsh environments, reflecting a high degree of attention to the health and safety of employees, and providing strong technical support for thermal power plants to achieve clean and efficient production.

[0034] The specific solution is as follows: When the jaw counter-rotating screen crusher is working, the material enters from the top opening of the screen 1. After entering the screen 1, the material first comes into contact with the filter screen 2 installed on the inner wall. The raw ash with a smaller particle size passes directly through the filter screen 2, while the large coke blocks roll along the inclined surface of the filter screen 2 and fall from the gap between the lowest point of the filter screen 2 and the side wall of the screen 1. The falling large coke blocks will land on one of the first guide plate 4, the second guide plate 5, or the third guide plate 6, so that the coke blocks fall from different horizontal positions, avoiding them all falling from one point. This makes full use of the working surface of the counter-rotating crushing components. The screened raw ash falls from the left part of the bottom opening of the screen 1 into the transition chamber in the crusher 9, and then falls directly into the transition bin 13. The coke blocks fall from the right part of the bottom opening of the screen 1 into the crushing chamber in the crusher 9, where they are crushed by extrusion and shearing forces. The crushed particles fall into the transition bin 13 and are then introduced into the ash conveying silo pump, completing the efficient operation process from screening to crushing to conveying.

[0035] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A jaw counter-rotating screening and crushing machine, comprising a screening unit (1), a crusher (9), and a transition chamber (13), characterized in that: The lower end of the screener (1) is installed at the upper end of the crusher (9), and the upper end of the transition chamber (13) is installed at the lower end of the crusher (9). The screener (1), the crusher (9), and the transition chamber (13) all have two openings, one at the top and one at the bottom, and the screener (1), the crusher (9), and the transition chamber (13) are interconnected. The crusher (9) is equipped with a counter-rotating crushing assembly. The inner wall of the sieve (1) is equipped with a filter screen (2), which is used to sieve the raw ash. The filter screen (2) is inclined and faces the bottom of the opening on the screen (1). There is a gap between the lowest point of the filter screen (2) and the side wall of the screen (1). The inner wall of the sieve (1) is fixedly connected to a flow divider (3). One end of the flow divider (3) is fixedly connected to the end of the filter screen (2) at the lowest point, and the other end divides the lower opening of the sieve (1) into two parts, left and right. The inner wall of the sieve (1) is fixedly connected to an inclined first guide plate (4), an inclined second guide plate (5), and an inclined third guide plate (6). There is a gap between the highest point of the first guide plate (4) and the side wall of the sieve (1), and the gap between the highest point of the first guide plate (4) and the side wall of the sieve (1) is smaller than the gap between the lowest point of the filter screen (2) and the side wall of the sieve (1). The gap between the highest point of the second guide plate (5) and the side wall of the screener (1) is smaller than the gap between the highest point of the first guide plate (4) and the side wall of the screener (1). The highest point of the third guide plate (6) is connected to the side wall of the screener (1). The length of the first guide plate (4) is greater than the length of the second guide plate (5). The length of the second guide plate (5) is greater than the length of the third guide plate (6). The inner wall of the crusher (9) is fixedly connected to a partition plate (10), which divides the space inside the crusher (9) into a crushing chamber and a transition chamber. The counter-rotating crushing component is located in the crushing chamber. The upper opening of the crusher (9) includes a coke block inlet (15) and a raw ash inlet (16). The raw ash inlet (16) is connected to the transition chamber, and the coke block inlet (15) is connected to the crushing chamber. The left part of the lower opening of the screen (1) is aligned with the raw ash inlet (16), and the right part of the lower opening of the screen (1) is aligned with the coke block inlet (15).

2. The jaw counter-rotating screening and crushing machine according to claim 1, characterized in that, The counter-rotating crushing assembly includes a drive roller (11) and a driven roller (14). Both the drive roller (11) and the driven roller (14) are rotatably connected to the crusher (9). A reduction motor (12) is installed on the surface of the crusher (9). The reduction motor (12) is used to drive the drive roller (11) to rotate. The drive roller (11) drives the driven roller (14) to rotate through gear transmission.

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