Coal screening equipment for coal mining
By designing coal screening equipment that includes crushing components and screening components, the problem of difficulty in removing high hardness inorganic impurities in the prior art is solved, and the effect of improving coal quality and environmental protection is achieved.
Patent Information
- Application Number
- CN202411571002.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-02-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing coal screening equipment is difficult to effectively remove inorganic impurities with high hardness in raw coal, such as gangue and pyrote, resulting in a decline in coal quality and environmental pollution.
A coal screening equipment used in coal mine development is designed, including crushing components and screening components. The crushing assembly uses a crushing knife made of high chrome cast iron to separate coal and inorganic impurities according to the difference in hardness between coal and impurities. The screening assembly can knock coal blocks with larger block diameters through vibrating screen plates and barrier strips, and improve screening accuracy and efficiency.
It effectively separates coal from inorganic impurities with high hardness, improves the quality and utilization efficiency of coal, reduces environmental pollution, and extends the service life of the equipment.
Smart Images
Figure CN119524984A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of coal screening, in particular to a coal screening device used in coal mining. Background Art
[0002] As an important fossil energy, coal occupies an important position in the global energy structure. It is widely used in many industries such as electricity, steel, and chemicals, providing indispensable energy support for industrial production and people's daily lives. However, raw coal mined from underground usually contains a variety of impurities, which not only affect the quality and utilization efficiency of coal, but also may have adverse effects on the environment and equipment. For example, if inorganic impurities such as gangue and pyrite are burned with coal, it will affect the combustion efficiency of coal and produce harmful gases to pollute the environment.
[0003] Therefore, it is necessary to introduce coal screening equipment to remove inorganic hard impurities such as gangue and pyrite contained in raw coal. However, existing coal screening equipment usually adopts the method of cleaning first and then screening to remove impurities. The hardness and density of inorganic impurities such as gangue and pyrite are much greater than those of coal, and the block size is not significantly different from that of coal. Therefore, it is impossible to separate such inorganic hard impurities by the above-mentioned method of cleaning first and then screening.
[0004] In view of this, we propose a coal screening equipment for coal mining to improve the deficiencies in the prior art. Summary of the invention
[0005] The object of the present invention is to provide a coal screening device for use in coal mining to solve the problems raised in the above-mentioned background technology.
[0006] To achieve the above object, the present invention provides a coal screening device for coal mining, comprising a base, a screening component is provided on the top of the base, a crushing component is provided on the top of the screening component, a plurality of green dust reduction components are provided on the top of the crushing component, a conveyor belt for transporting crushed coal is provided between the screening component and the top of the base, and a material guide bin for guiding material is provided between the bottom of the screening component and the top of the conveyor belt;
[0007] The crushing component is used to crush the mined raw coal, the screening component is used to separate impurities with high hardness from the crushed coal, and the screening component can break up coal blocks with larger block diameters. In the process of the crushing component crushing the raw coal, several of the green dust reduction components are used to recycle the raised coal powder particles.
[0008] As a further improvement of the present technical solution, the crushing assembly includes a crushing bin, in which a pair of symmetrically arranged crushing rollers are rotatably connected, a feed port is opened on one side of the crushing bin, the two crushing rollers are meshed with each other, gears are coaxially connected to the same side of the two crushing rollers, a cover plate is fixedly connected to the top of the crushing bin, and the crushing rollers are driven by a motor.
[0009] As a further improvement of the technical solution, a crushing knife is provided on the periphery of each crushing roller, and the material of the crushing knife is high chromium cast iron.
[0010] As a further improvement of the present technical solution, the screening component includes at least a screening bin, the four corners of the screening bin are fixedly connected to brackets, a sieve plate is provided inside the bracket, a plurality of sieve holes vertically downward are provided on the sieve plate, a plurality of vibration pumps are installed on the side walls of the screening bin, and a debris removal port is provided on one of the screening bins.
[0011] As a further improvement of the technical solution, the height of the sieve plate gradually decreases from the side far from the impurity removal port to the side close to the impurity removal port.
[0012] As a further improvement of the technical solution, a plurality of blocking bars are provided on the top of the screening bin, and the width of the blocking bars gradually narrows from the bottom to the top.
[0013] As a further improvement of the present technical solution, the green dust reduction component includes an installation groove opened on the top of the cover plate, a limit frame is provided in the installation groove, an exhaust fan is coaxially connected to the top of the limit frame, a dust reduction pipe is connected to the top of the installation groove, and the exhaust fan is driven by a motor.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] 1. In the coal screening equipment used in the coal mine, the crushing components are set up to crush the raw coal. Since the inorganic impurities such as gangue and pyrite contained in the raw coal have high hardness, and the crushing knife is made of high-chromium cast iron, the crushing knife uses the hardness difference between these inorganic impurities and coal to separate the coal from the impurities. Specifically, the raw coal mined from the coal mine is added to the crushing bin through the feed port, and the two crushing rollers rotating in opposite directions crush the raw coal added to the crushing bin. The crushing knife made of high-chromium cast iron can cut the coal, but will not crush the inorganic impurities with high hardness such as gangue and pyrite in the raw coal, and can also prevent the impurities with high hardness from damaging the crushing knife. After the raw coal is crushed by the crushing roller, coal with smaller block size and inorganic hard impurities with larger block size are obtained.
[0016] 2. In the coal screening equipment used in the coal mine, the screening component is used to separate impurities with high hardness and crushed coal, and the screening component can break up coal blocks with larger block diameters. Specifically, the crushed raw coal falls from the crushing bin into the screening bin, and the crushed coal blocks pass through the sieve holes and fall onto the conveyor belt below for transportation to other places. In the process of the vibrating pump driving the screen plate to vibrate up and down, the blocking bar on the screen plate vibrates up and down synchronously with the screen plate. On the one hand, the blocking bar can prevent the crushed coal from sliding out of the screening bin from the impurity removal port with the hard inorganic impurities with larger block diameters, thereby improving the screening accuracy and efficiency of the coal; on the other hand, the vibrating screen plate will lift up the coal blocks that are not completely crushed and have relatively large block diameters. These large-block coal blocks are difficult to pass through the sieve holes and fall onto the conveyor belt, and may even block the sieve holes. The lifted large-block coal blocks fall to the top of the sharper blocking bar, which breaks up the large-block coal blocks so that they can pass through the sieve holes and fall onto the conveyor belt. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;
[0018] Figure 2 It is a partial cutaway schematic diagram of the present invention;
[0019] Figure 3 A top view of a crushing assembly of the present invention;
[0020] Figure 4 A top view of the screening assembly of the present invention;
[0021] Figure 5 It is a front view of the screening assembly of the present invention;
[0022] Figure 6 For the present invention Figure 5 Enlarged view of point A in the middle;
[0023] Figure 7 It is a cutaway front view of the green dust suppression assembly of the present invention;
[0024] Figure 8 It is a top view of the green dust reduction component of the present invention.
[0025] The meaning of each number in the figure is:
[0026] 11. Base; 12. Conveyor belt; 13. Material guide bin;
[0027] 20. Crushing assembly; 21. Crushing chamber; 22. Crushing roller; 23. Feeding port; 24. Gear; 25. Cover plate;
[0028] 30. Screening assembly; 31. Screening bin; 32. Bracket; 33. Screen plate; 34. Vibrating pump; 35. Screen hole; 36. Blocking bar; 37. Impurity removal port;
[0029] 40. Green dust suppression component; 41. Limiting frame; 42. Exhaust fan; 43. Dust suppression pipe. DETAILED DESCRIPTION
[0030] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0033] Example
[0034] See also Figure 1 and Figure 2 As shown, the purpose of this embodiment is to provide a coal screening device used in coal mining, including a base 11, a screening component 30 is provided on the top of the base 11, a crushing component 20 is provided on the top of the screening component 30, a plurality of green dust reduction components 40 are provided on the top of the crushing component 20, a conveyor belt 12 for transporting crushed coal is provided between the screening component 30 and the top of the base 11, and a material guide bin 13 for guiding materials is provided between the bottom of the screening component 30 and the top of the conveyor belt 12;
[0035] The crushing component 20 is used to crush the mined raw coal, the screening component 30 is used to separate impurities with high hardness from the crushed coal, and the screening component 30 can break up coal blocks with larger block diameters. In the process of the crushing component 20 crushing the raw coal, several green dust reduction components 40 are used to recycle the raised coal powder particles.
[0036] Working principle: First, the raw coal mined from the coal mine is added to the crushing assembly 20, which crushes the raw coal. The crushed coal blocks and uncrushed hard inorganic impurities fall into the screening assembly 30 for screening. The coal with smaller particles after crushing falls to the bottom conveyor belt 12 and is transported elsewhere, while the uncrushed hard inorganic impurities with larger block diameters are removed from the screening assembly 30. In the process of crushing the raw coal by the crushing assembly 20, the green dust reduction assembly 40 collects the raised coal powder particles and guides them to the conveyor belt 12 to wait for transportation and use.
[0037] After coal is mined from the ground, the raw coal contains a lot of impurities, which need to be removed before use. Among them, inorganic impurities such as gangue and pyrite have a harder and denser texture than raw coal, and cannot be removed by washing like clay minerals and organic impurities. If these impurities are burned with the coal, it will affect the combustion efficiency of the coal and produce harmful gases to pollute the environment. Therefore, a crushing component 20 is provided that can screen out the coal according to the difference in hardness between the coal and the impurities.
[0038] Figure 3 The specific structure of the crushing assembly 20 is shown. The crushing assembly 20 includes a crushing chamber 21. A pair of symmetrically arranged crushing rollers 22 are rotatably connected in the crushing chamber 21. A feed port 23 is provided on one side of the crushing chamber 21. The two crushing rollers 22 are meshed with each other. Gears 24 are coaxially connected to the same side of the two crushing rollers 22. A cover plate 25 is fixedly connected to the top of the crushing chamber 21. The crushing rollers 22 are driven by a motor.
[0039] The improvement is that: each crushing roller 22 is provided with a crushing knife on the periphery, and the crushing knife is made of high chromium cast iron; the raw coal mined from the coal mine is added to the crushing bin 21 through the feed port 23, and after the power is turned on, the motor drives the crushing roller 22 coaxially connected to its own output shaft to rotate, and the crushing roller 22 drives the gear 24 coaxially connected to itself to rotate, and the gear 24 then drives another gear 24 meshing with itself to rotate in the opposite direction, and the other gear 24 then drives the crushing roller 22 coaxially connected to itself to rotate, and the two crushing rollers 22 also rotate in the opposite direction. The two crushing rollers 22 rotating in the opposite direction crush the raw coal added to the crushing bin 21, and the crushing knife made of high chromium cast iron can cut the coal, but will not crush the inorganic impurities with high hardness such as gangue and pyrite in the raw coal, and at the same time can prevent the impurities with high hardness from damaging the crushing knife. After the raw coal is crushed by the crushing roller 22, coal with smaller block diameter and inorganic hard impurities with larger block diameter are obtained.
[0040] For some relatively hard coal, after being crushed by the crushing knife, the block size remains large after it falls into the screening assembly 30, and it is difficult to fall from the screening assembly 30 to the conveyor belt 12. It will block the screening assembly 30, affecting the screening accuracy and efficiency of the coal. Therefore, a screening assembly 30 is provided that can automatically break up large-diameter coal blocks and separate coal from impurities.
[0041] like Figure 4-Figure 6 As shown, the specific structure of the screening component 30 is disclosed below. The screening component 30 at least includes a screening bin 31. The four corners of the screening bin 31 are fixedly connected to the periphery with a bracket 32. A screen plate 33 is arranged in the bracket 32. The screen plate 33 is provided with a plurality of screen holes 35 vertically downward. A plurality of vibration pumps 34 are installed on the side wall of the screening bin 31. A debris removal port 37 is provided on one of the screening bins 31.
[0042] Furthermore, the height of the screen plate 33 gradually decreases from the side away from the impurity removal port 37 to the side close to the impurity removal port 37; a plurality of blocking bars 36 are provided on the top of the screening bin 31, and the width of the blocking bars 36 gradually narrows from the bottom to the top; after the raw coal is crushed by the crushing roller 22, coal with smaller block diameter and inorganic hard impurities with larger block diameter are obtained. The crushed raw coal falls from the crushing bin 21 into the screening bin 31, and at this time, the power supply of the vibration pump 34 is turned on, and the vibration pump 34 drives the screen plate 33 to vibrate evenly through the transmission of the side wall of the screening bin 31. Since the screen plate 33 is inclined, the coal blocks and inorganic hard impurities such as gangue and pyrite that fall on the screen plate 33 are screened by the vibrating screen plate 33. The crushed coal blocks pass through the screen holes 35 and fall onto the conveyor belt 12 below for transportation elsewhere. The inorganic hard impurities slide downward under the action of gravity, and then slide down from the impurity removal port 37 at the bottom of the screen plate 33. When the vibration pump 34 drives the screen plate 33 to vibrate up and down, the blocking bar 36 on the screen plate 33 vibrates up and down synchronously with the screen plate 33. On the one hand, the blocking bar 36 can prevent the crushed coal from sliding out of the screening bin 31 from the impurity removal port 37 along with the hard inorganic impurities with larger block sizes, thereby improving the screening accuracy and efficiency of the coal; on the other hand, the vibrating screen plate 33 will lift up the coal blocks that have not been completely crushed and have relatively large block sizes. These large-diameter coal blocks are difficult to pass through the screen holes 35 and fall onto the conveyor belt 12, and may even block the screen holes 35. The lifted large-diameter coal blocks fall to the top of the sharper blocking bar 36, which breaks up the large-diameter coal blocks so that they can pass through the screen holes 35 and fall onto the conveyor belt 12.
[0043] In the process of crushing raw coal, large dust will be generated. If it is not interfered, it will diffuse in the surrounding environment and affect the health of workers. In addition, the main component of the dust is fine coal powder particles. If it is directly discharged, it will cause a waste of coal resources. Therefore, a green dust reduction component 40 is set up to collect and reuse the dust.
[0044] like Figure 7 and Figure 8 As shown, the green dust reduction component 40 includes a mounting groove opened on the top of the cover plate 25, a limit frame 41 is provided in the mounting groove, an exhaust fan 42 is coaxially connected to the top of the limit frame 41, a dust reduction pipe 43 is connected to the top of the mounting groove, and the exhaust fan 42 is driven by a motor.
[0045] The improvement is that after the power is turned on, the motor drives the exhaust fan 42 coaxially connected to its own output shaft to rotate. After the exhaust fan 42 rotates, negative pressure is formed in the dust suppression pipe 43, which guides the dust generated in the crushing bin 21 to the conveyor belt 12, waiting for the conveyor belt 12 to transport it for use.
[0046] In summary, the working principle of this scheme is as follows: First, the raw coal mined from the coal mine is added to the crushing bin 21 through the feed port 23. After the power is turned on, the motor drives the crushing roller 22 coaxially connected to its own output shaft to rotate, and the crushing roller 22 drives the gear 24 coaxially connected to itself to rotate, and the gear 24 then drives another gear 24 meshing with itself to rotate in the opposite direction, and the other gear 24 then drives the crushing roller 22 coaxially connected to itself to rotate, and the two crushing rollers 22 also rotate in the opposite direction. The two crushing rollers 22 rotating in the opposite direction crush the raw coal added to the crushing bin 21, and the crushing knife made of high chromium cast iron can cut the coal, but will not crush the inorganic impurities with higher hardness such as gangue and pyrite in the raw coal, and at the same time can prevent the impurities with high hardness from damaging the crushing knife. After the raw coal is crushed by the crushing roller 22, coal with smaller block diameter and inorganic hard impurities with larger block diameter are obtained.
[0047] After the raw coal is crushed by the crushing roller 22, coal with smaller block diameter and inorganic hard impurities with larger block diameter are obtained. The crushed raw coal falls from the crushing bin 21 into the screening bin 31. At this time, the power supply of the vibration pump 34 is turned on. The vibration pump 34 drives the screen plate 33 to vibrate evenly through the transmission of the side wall of the screening bin 31. Since the screen plate 33 is set at an angle, the coal blocks and inorganic hard impurities such as gangue and pyrite that fall on the screen plate 33 are screened by the vibrating screen plate 33. The crushed coal blocks pass through the screen holes 35 and fall onto the conveyor belt 12 below for transportation elsewhere. The inorganic hard impurities slide downward under the action of gravity and then slide down from the impurity removal port 37 at the bottom of the screen plate 33. In the process of the vibration pump 34 driving the screen plate 33 to vibrate up and down, the blocking bar 36 on the screen plate 33 vibrates up and down synchronously with the screen plate 33. On the one hand, the blocking bar 36 can prevent the crushed coal from sliding out of the screening bin 31 from the impurity removal port 37 along with the hard inorganic impurities with larger block sizes, thereby improving the screening accuracy and efficiency of the coal; on the other hand, the vibrating screen plate 33 will lift up the coal blocks that are not completely crushed and have relatively large block sizes. These large-diameter coal blocks are difficult to pass through the screen holes 35 and fall onto the conveyor belt 12, and may even block the screen holes 35. The lifted large-diameter coal blocks fall to the top of the relatively sharp blocking bar 36, which breaks up the large-diameter coal blocks so that they can pass through the screen holes 35 and fall onto the conveyor belt 12.
[0048] When the crushing roller 22 crushes the raw coal, the exhaust fan 42 rotates to form a negative pressure in the dust suppression pipe 43, and guides the dust generated in the crushing bin 21 to the conveyor belt 12, waiting for the conveyor belt 12 to transport it for use.
[0049] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.
Claims
1. A coal screening device for coal mining, characterized in that: The invention comprises a base (11), a screening component (30) is arranged on the top of the base (11), a crushing component (20) is arranged on the top of the screening component (30), a plurality of green dust reduction components (40) are arranged on the top of the crushing component (20), a conveyor belt (12) for transporting crushed coal is arranged between the screening component (30) and the top of the base (11), and a material guide bin (13) for guiding material is arranged between the bottom of the screening component (30) and the top of the conveyor belt (12); The crushing component (20) is used to crush the mined raw coal, the screening component (30) is used to separate impurities with high hardness from the crushed coal, and the screening component (30) is capable of breaking up coal blocks with larger block diameters. During the process of the crushing component (20) crushing the raw coal, a plurality of the green dust reduction components (40) are used to recycle the raised coal powder particles.
2. The coal screening device for coal mining according to claim 1, characterized in that: The crushing assembly (20) comprises a crushing chamber (21), a pair of symmetrically arranged crushing rollers (22) are rotatably connected in the crushing chamber (21), a feed port (23) is provided on one side of the crushing chamber (21), the two crushing rollers (22) are meshed with each other, a gear (24) is coaxially connected to the same side of the two crushing rollers (22), a cover plate (25) is fixedly connected to the top of the crushing chamber (21), and the crushing rollers (22) are driven by a motor.
3. The coal screening device for coal mining according to claim 2, characterized in that: A crushing knife is arranged on the periphery of each crushing roller (22), and the crushing knife is made of high-chromium cast iron.
4. The coal screening device for coal mining according to claim 1, characterized in that: The screening component (30) comprises at least a screening bin (31), the four corners of the screening bin (31) are fixedly connected to brackets (32), a screen plate (33) is arranged inside the bracket (32), a plurality of screen holes (35) vertically downward are provided on the screen plate (33), a plurality of vibration pumps (34) are installed on the side wall of the screening bin (31), and a debris removal port (37) is provided on one of the screening bins (31).
5. The coal screening device for coal mining according to claim 4, characterized in that: The height of the sieve plate (33) gradually decreases from a side away from the impurity removal opening (37) to a side close to the impurity removal opening (37).
6. The coal screening device for coal mining according to claim 4, characterized in that: A plurality of blocking bars (36) are provided on the top of the screening bin (31), and the width of the blocking bars (36) gradually narrows from the bottom to the top.
7. The coal screening equipment used in coal mining according to claim 2, characterized in that: The green dust reduction component (40) comprises a mounting groove opened on the top of the cover plate (25), a limiting frame (41) is arranged in the mounting groove, an exhaust fan (42) is coaxially connected to the top of the limiting frame (41), a dust reduction pipe (43) is connected to the top of the mounting groove, and the exhaust fan (42) is driven by a motor.