Coal stone crushing device for coal mining

Abstract

The utility model discloses a coal stone crushing device for coal mining in coal mine, including the casing, the casing bottom is connected with the discharge hopper, the casing upper surface is equipped with the axle through -hole and the feed port, the casing upper surface is installed with the motor, and the drive shaft of motor passes through axle through -hole and extends into the casing inside, and drive shaft fixed sleeve is equipped with a plurality of mounting pieces, and a plurality of broken hammers are installed to mounting piece annular array, and the lower part fixed connection of casing inner wall is equipped with upper mill disc, and the bottom is connected with lower mill disc to drive shaft, and the upper surface of lower mill disc is equipped with the installation sleeve of drive shaft adaptation, and the circumferential surface of installation sleeve annular array is equipped with a plurality of positioning screw holes, and the fastening bolt is equipped in positioning screw hole, and lower mill disc is located below upper mill disc. Through motor drive broken hammer first coalstone is broken, and the coalstone after breaking is polished through upper mill disc and lower mill disc, and the unified granularity is formed, thereby realizing the purpose that the size of all coalstone after once broken processing can be in a unified particle grade range.

Description

Technical Field

[0001] This utility model belongs to the technical field of coal mining and processing equipment, and in particular relates to a coal crushing device for coal mining. Background Technology

[0002] During the coal mining process, the raw coal extracted from underground or open-pit mines is usually mixed with large pieces of coal and stone, which need to be crushed to meet the needs of subsequent washing, screening, transportation or direct combustion. Therefore, coal crushing equipment is one of the key pieces of equipment in the coal production chain.

[0003] Traditional coal crushing equipment mostly adopts a single-stage crushing structure, directly pouring coal into the crushing chamber for one-time crushing. Due to the uneven hardness and large differences in block size of coal, the coal particles after a single crushing are of different sizes, making it impossible to achieve a uniform particle size range for all crushed coal. It is necessary to transfer the coal to a secondary crushing device for further crushing, which makes the crushing process cumbersome, reduces crushing efficiency, and increases equipment investment and operating costs in coal mining and processing. Utility Model Content

[0004] The purpose of this invention is to use a motor to drive a breaker hammer to first crush coal and stone. The crushed coal and stone then pass through the gap between the upper and lower grinding discs. The motor drives the lower grinding disc to rotate, grinding the coal and stone passing between the upper and lower grinding discs. This process results in a uniform particle size, solving the problem in the background technology where the coal and stone particles are of inconsistent size after a single crushing operation. If the crushed coal and stone are to be within a uniform particle size range, they need to be transferred to a secondary crushing device for further crushing, which leads to a cumbersome crushing process, reduced crushing efficiency, and increased equipment investment and operating costs in coal mining and processing.

[0005] The specific technical solution of this utility model is as follows: A coal crushing device for coal mining includes a shell with a cylindrical chamber open at the bottom inside. A discharge hopper is connected to the bottom of the shell. The upper surface of the shell has a shaft through hole and a feed inlet. A motor is installed on the upper surface of the shell. The drive shaft of the motor passes through the shaft through hole and extends into the interior of the shell. Several mounting parts are fixedly sleeved on the drive shaft. The mounting parts are arranged in a linear array. Several breaker hammers are installed in a ring array on the mounting parts. An upper grinding disc is fixedly connected to the lower part of the inner wall of the shell. The upper grinding disc has a circular cross-section, and the inner diameter of the ring is larger than the outer diameter of the drive shaft. A lower grinding disc is connected to the bottom of the drive shaft. The lower grinding disc has a circular cross-section. An installation sleeve adapted to the drive shaft is provided on the upper surface of the lower grinding disc. The installation sleeve has a circular cross-section and several positioning threaded holes arranged in a ring array on the circumference of the installation sleeve. Fastening bolts are installed in the positioning threaded holes. The lower grinding disc is located below the upper grinding disc.

[0006] Furthermore, a feed hopper is connected to the upper part of the feed inlet, and the feed hopper is inverted cone shape.

[0007] Furthermore, the mounting components include an upper clamping plate and a lower clamping plate, both of which have annular cross-sections. The upper and lower clamping plates are each provided with several mounting through holes arranged in a circular array, and the hydraulic breaker is provided with fixing through holes that are adapted to the mounting through holes.

[0008] Furthermore, the breaker includes a connector with a fixed through hole. A hammer head is fixedly connected to the top of the connector, and the top of the hammer head is an outwardly convex arc surface. The thickness of the connector is equal to the vertical distance between the upper and lower clamping plates.

[0009] Furthermore, the upper clamping plate annular array has two rings of mounting through holes, the lower clamping plate annular array has two rings of mounting through holes, and two fixing through holes are provided opposite to each other.

[0010] Furthermore, the inner wall of the shell is provided with a ring array of several strip teeth, the cross-section of which is trapezoidal.

[0011] Furthermore, a protective plate is vertically provided on the upper surface of the shell, and a motor is installed on the side of the protective plate facing away from the feed inlet.

[0012] Furthermore, lifting rings are provided on the upper surface of the housing.

[0013] Furthermore, the upper surface of the upper grinding disc is a slope one that is inclined towards the axis, the upper surface of the lower grinding disc is a slope three that is inclined towards the circumference, and the lower surface of the upper grinding disc is provided with a slope two that is adapted to the upper surface of the lower grinding disc.

[0014] Furthermore, the bottom of the shell is provided with flange one, the top of the discharge hopper is provided with flange two that is compatible with flange one, and the lower surface of flange two is provided with several support legs.

[0015] Compared with the prior art, the present invention has the following beneficial effects: During operation, coal enters the housing through the feed hopper. The motor drives the crusher to rotate, breaking the coal. Because the drive shaft has multiple layers of crushers, the number and frequency of impacts on the coal are increased, improving the crushing effect. The crushed coal slides into the gap between the upper and lower grinding discs. The motor drives the lower grinding disc to rotate, and the upper and lower grinding discs further crush and grind the coal in the gap, bringing all the coal particles to a uniform size range before dropping into the discharge hopper. The distance between the upper and lower grinding discs can be adjusted by changing the depth of the drive shaft insertion into the mounting sleeve, thus adjusting the particle size range of the crushed coal. This eliminates the need for secondary crushing equipment, saving on equipment investment in coal mining and processing, and reducing operating costs. Attached Figure Description

[0016] Figure 1This is a three-dimensional structural diagram of an embodiment of the present utility model; Figure 2 This is a partial cross-sectional view of an embodiment of the present utility model; Figure 3 This is an assembly drawing of the drive shaft and the breaker hammer in an embodiment of this utility model; Figure 4 This is a three-dimensional structural diagram of the shell in an embodiment of the present utility model; Figure 5 This is a three-dimensional structural diagram of the drive shaft in an embodiment of the present utility model; Figure 6 This is a three-dimensional structural diagram of the hydraulic breaker in an embodiment of the present utility model; Figure 7 This is a front view of the lower grinding disc in an embodiment of the present invention; Figure 8 This is a cross-sectional view of the upper grinding disc in an embodiment of the present invention; Figure label: 1. Housing; 11. Toothed strip; 12. Protective plate; 13. Lifting ring; 14. Flange 1; 15. Shaft through hole; 16. Feed inlet; 17. Limiting protrusion; 2. Motor; 21. Drive shaft; 22. Mounting component; 221. Upper chuck; 222. Lower chuck; 223. Mounting through hole; 23. Hydraulic hammer; 231. Connecting component; 232. Hammer head; 233. Fixing through hole; 3. Feed hopper; 4. Upper millstone; 41. Inclined surface one; 42. Inclined surface two; 5. Lower grinding disc; 51. Installing sleeve; 511. Locating threaded hole; 52. Bevel three; 6. Discharge hopper; 61. Flange 2; 62. Support leg. Detailed Implementation

[0017] To better understand the purpose, structure, and function of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0018] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] See Figures 1 to 8This embodiment discloses a coal crushing device for coal mining, including a shell 1, which is cylindrical. The geometric symmetry and uniform stress distribution of the cylinder can improve the structural strength of the shell 1 and resist the impact of coal on the shell 1. The shell 1 has a cylindrical cavity with an open bottom. A discharge hopper 6 is connected to the bottom of the shell 1. The discharge hopper 6 is inverted conical and has openings at the top and bottom. The top opening of the discharge hopper 6 communicates with the internal cavity of the shell 1, and the bottom opening of the discharge hopper 6 is used to discharge the crushed coal. The upper surface of the shell 1 has a shaft through hole 15 and a feed inlet 16. The feed inlet 16 is used to feed coal into the shell 1. The shaft through hole 15 is located at the center of the upper surface. A motor 2 is installed on the upper surface of the shell 1. The drive shaft 21 of the motor 2 passes through the shaft through hole 15 and extends into the shell 1. Several mounting parts 22 are fixedly sleeved on the drive shaft 21. In this embodiment, the drive shaft 21 and the mounting parts 22 are made of metal and are connected by welding. The several mounting parts 22 are linearly arrayed. The assembly 22 is equipped with several hydraulic breakers 23 arranged in a ring array. An upper grinding disc 4 is fixedly connected to the lower part of the inner wall of the housing 1. The upper grinding disc 4 has a circular cross-section. In this embodiment, an annular limiting protrusion 17 is provided on the inner wall of the housing 1. An internal thread is provided below the limiting protrusion 17. The circumferential surface of the upper grinding disc 4 is provided with an external thread. The upper grinding disc 4 and the housing 1 are connected by the cooperation of the internal and external threads. The threaded connection is easy to disassemble and facilitates the replacement of the upper grinding disc 4 after wear. Further optimization is possible by having the internal and external threads tighten clockwise for installation and loosen counterclockwise for disassembly. The drive shaft 21 rotates clockwise during operation. This way, when the lower grinding disc 5 rotates, it applies a clockwise force to the upper grinding disc 4, preventing the upper grinding disc 4 from loosening and falling off due to the lower grinding disc 5 applying a counterclockwise force. This improves the safety of equipment operation. Furthermore, the limiting protrusion 17 can prevent the upper grinding disc 4 from rotating further upward, enhancing the stability of the device operation.The inner diameter of the annular ring is larger than the outer diameter of the drive shaft 21 and the mounting sleeve 51. A lower grinding disc 5 is connected to the bottom of the drive shaft 21. The lower grinding disc 5 has a circular cross-section. A mounting sleeve 51, adapted to the drive shaft 21, is provided on the upper surface of the lower grinding disc 5. The mounting sleeve 51 has an annular cross-section. Several positioning threaded holes 511 are arranged in an annular array on the circumferential surface of the mounting sleeve 51. Fastening bolts are installed inside the positioning threaded holes 511. Tightening the fastening bolts, the lower grinding disc 5 is fixed to the drive shaft 21 by the pressing force exerted by the fastening bolts on the circumferential surface of the drive shaft 21. In this embodiment, four positioning threaded holes 511 are provided, arranged in pairs opposite each other, improving the stability of the installation connection between the lower grinding disc 5 and the drive shaft 21. Further optimization is possible by having four keyways arranged in an annular array on the inner wall of the mounting sleeve 51, and four keys arranged in an annular array on the bottom circumferential surface of the drive shaft 21 to match the keyways. 1. The key connection between the drive shaft 21 and the lower grinding disc 5 is achieved through the cooperation of the keyway and the key, which further improves the stability of the installation of the drive shaft 21. The lower grinding disc 5 is located below the upper grinding disc 4. During the coal crushing operation, the coal is fed into the housing 1 through the feed hopper 3. The motor 2 is started to drive the crusher 23 to rotate and crush the coal. The crushed coal slides into the gap between the upper grinding disc 4 and the lower grinding disc 5. The motor 2 drives the lower grinding disc 5 to rotate. The upper grinding disc 4 and the lower grinding disc 5 further crush and grind the coal in the gap, grinding all the coal particles into a uniform particle size range. Then it falls into the feed hopper 6 and leaks from the feed hopper 6 to the coal transportation equipment for subsequent transportation operations. The distance between the upper grinding disc 4 and the lower grinding disc 5 can be adjusted by adjusting the depth of the insertion of the bottom end of the drive shaft 21 into the installation sleeve 51, thereby adjusting the particle size range of the crushed coal.

[0020] The feed inlet 16 is connected to the feed hopper 3 at the top. The feed hopper 3 is an inverted cone shape. The inverted cone structure, through its geometric shape that is wider at the top and narrower at the bottom, combined with the inclined wall design, utilizes gravity flow and the guiding effect of the wall to promote the smooth flow of coal and stone and reduce the risk of coal and stone blockage.

[0021] Mounting component 22 includes an upper clamping plate 221 and a lower clamping plate 222. Both the upper and lower clamping plates 221 and 222 have annular cross-sections. Each clamping plate 221 and 222 has several mounting through holes 223 arranged in a circular array. The mounting through holes 223 on the upper clamping plate 221 are opposite to those on the lower clamping plate 222. The breaker hammer 23 has fixing through holes 233 that mate with the mounting through holes 223. Through the mounting through holes 223, fixing through holes 233, and the use of bolts and nuts, the breaker hammer 23 is mounted between the upper and lower clamping plates 221 and 222. The number of mounting through holes 223 can be selected according to actual needs, such as... Figure 3As shown in this embodiment, the staggered arrangement of the upper and lower breaker hammers 23 not only improves the crushing effect, but also disperses the impact force between the upper and lower layers in space, avoiding stress concentration on the same vertical line, reducing the structural load of the coal crushing device. The staggered structure can also change the material falling path, increase the residence time of coal in the shell 1, and improve the fullness of crushing.

[0022] The hydraulic breaker 23 includes a connector 231, which has a fixing through hole 233. A hammer head 232 is fixedly connected to the top of the connector 231. The top of the hammer head 232 has an outwardly convex arc surface. In this embodiment, the connector 231 and the hammer head 232 are made of metal and are connected by welding. The thickness of the connector 231 is equal to the vertical distance between the upper clamping plate 221 and the lower clamping plate 222 to ensure the stability of the hydraulic breaker 23 installed between the upper clamping plate 221 and the lower clamping plate 222 and to prevent the hydraulic breaker 23 from shaking up and down when rotating.

[0023] The upper clamping plate 221 has two rings of mounting through holes 223 in an annular array, and the lower clamping plate 222 has two rings of mounting through holes 223 in an annular array. There are two opposite fixed through holes 233. The two opposite fixed through holes 233 can further improve the stability of the breaker 23 installed between the upper clamping plate 221 and the lower clamping plate 222, and prevent the breaker 23 from shaking due to the resistance of coal and stone during operation, which would affect the crushing effect.

[0024] The inner wall of the shell 1 is provided with a ring array of several strip teeth 11. The cross-section of the strip teeth 11 is trapezoidal. When the breaker hammer 23 rotates and squeezes the coal and stone against the inner wall of the shell 1, the strip teeth 11 with trapezoidal cross-section increases the friction on the coal and stone, which can improve the crushing effect.

[0025] A protective plate 12 is vertically provided on the upper surface of the shell 1. A motor 2 is installed on the side of the protective plate 12 away from the feed inlet 16. The protective plate 12 serves to install and fix the motor 2, and also to protect the motor 2, preventing coal and stone from falling onto the motor 2 and causing damage when the coal and stone are poured into the feed hopper 3.

[0026] The upper surface of the housing 1 is provided with lifting rings 13. When the crushing device needs to be disassembled and maintained, the lifting rings 13 facilitate the hoisting of the housing 1. In this embodiment, the upper surface of the housing 1 is provided with threaded mounting holes for installing the lifting rings 13.

[0027] The upper surface of the upper grinding disc 4 is an inclined surface 41 sloping towards the axis, which facilitates the coal and stone to slide from the upper surface of the upper grinding disc 4 to the center of the upper grinding disc 4 and fall onto the upper surface of the lower grinding disc 5. The upper surface of the lower grinding disc 5 is an inclined surface 52 sloping towards the circumference, which helps the coal and stone to slide to the edge of the lower grinding disc 5 after being ground in the gap between the upper grinding disc 4 and the lower grinding disc 5, and fall into the discharge hopper 6. The lower surface of the upper grinding disc 4 is provided with an inclined surface 42 that matches the inclined surface 52. The inclined surface 42 is parallel to the inclined surface 42, which ensures that the particle size of the ground coal and stone is within a uniform range. In this embodiment, the upper grinding disc 4 and the lower grinding disc 5 are made of metal. The inclined surfaces 42 and 52 are plated with a diamond micro powder abrasive layer with a thickness of 0.1~0.5mm by electroplating, which increases the friction between the upper grinding disc 4 and the lower grinding disc 5 and the ore, and improves the coal and stone crushing and grinding effect.

[0028] The bottom of the housing 1 is provided with flange 14, and the top of the discharge hopper 6 is provided with flange 2 61 that is compatible with flange 14. The housing 1 and the discharge hopper 6 are connected by flange 14, flange 2 61 and bolt kit, which facilitates the disassembly and maintenance of the coal crushing device, as well as the replacement and maintenance of the upper grinding disc 4 and the lower grinding disc 5. The lower surface of flange 2 61 is provided with several support legs 62 to support the entire coal crushing device.

[0029] Working principle: During coal crushing, coal is fed into the housing 1 through the feed hopper 3. The motor 2 is started to drive the crusher 23 to rotate, crushing the coal. Since the drive shaft 21 is equipped with multiple layers of crushers 23, the number and frequency of impacts on the coal are increased, improving the crushing effect. The crushed coal slides into the gap between the upper grinding disc 4 and the lower grinding disc 5. The motor 2 drives the lower grinding disc 5 to rotate, and the upper and lower grinding discs 4 and 5 further crush and grind the coal in the gap, grinding all the coal particles into a uniform particle size range. Then it falls into the discharge hopper 6 and leaks from the discharge hopper 6 onto the coal transportation equipment for subsequent transportation operations. By adjusting the depth of the insertion of the bottom end of the drive shaft 21 into the installation sleeve 51, the distance between the upper grinding disc 4 and the lower grinding disc 5 can be adjusted, thereby adjusting the particle size range of the crushed coal. This eliminates the need for secondary crushing equipment, saving equipment investment in coal mining and processing production and reducing operating costs.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A coal crushing device for coal mining, characterized in that: Includes a housing (1), inside which is a cylindrical chamber with an open bottom, and a discharge hopper (6) connected to the bottom of the housing (1); the upper surface of the housing (1) is provided with a shaft through hole (15) and a feed inlet (16), and a motor (2) is installed on the upper surface of the housing (1). The drive shaft (21) of the motor (2) passes through the shaft through hole (15) and extends into the interior of the housing (1). The drive shaft (21) is fixedly fitted with several mounting parts (22), which are arranged in a linear array. Several breaker hammers (23) are installed in a ring array on the mounting parts (22). The inner wall of the housing (1) The lower part is fixedly connected to an upper grinding disc (4). The upper grinding disc (4) has a circular cross-section and the inner diameter of the circular ring is larger than the outer diameter of the drive shaft (21). The bottom of the drive shaft (21) is connected to a lower grinding disc (5). The lower grinding disc (5) has a circular cross-section. The upper surface of the lower grinding disc (5) is provided with an installation sleeve (51) that is compatible with the drive shaft (21). The installation sleeve (51) has a circular cross-section and a number of positioning threaded holes (511) are arranged in a circular array on the circumference of the installation sleeve (51). Fastening bolts are provided in the positioning threaded holes (511). The lower grinding disc (5) is located below the upper grinding disc (4).

2. The coal crushing device for coal mining according to claim 1, characterized in that, The upper part of the feed inlet (16) is connected to the feed hopper (3), which is an inverted cone shape.

3. The coal crushing device for coal mining according to claim 1, characterized in that, The mounting component (22) includes an upper clamping plate (221) and a lower clamping plate (222). The upper clamping plate (221) and the lower clamping plate (222) have annular cross-sections. The upper clamping plate (221) and the lower clamping plate (222) are respectively arranged in annular array with several mounting through holes (223). The breaker hammer (23) is provided with a fixing through hole (233) that matches the mounting through hole (223).

4. The coal crushing device for coal mining according to claim 3, characterized in that, The hydraulic breaker (23) includes a connector (231), which has a fixed through hole (233). A hammer head (232) is fixedly connected to the top of the connector (231). The top of the hammer head (232) is an outwardly convex arc surface. The thickness of the connector (231) is equal to the vertical distance between the upper clamping plate (221) and the lower clamping plate (222).

5. The coal crushing device for coal mining according to claim 4, characterized in that, The upper clamping plate (221) has two rings of mounting through holes (223) in a circular array, and the lower clamping plate (222) has two rings of mounting through holes (223) in a circular array. There are two fixed through holes (233) opposite each other.

6. The coal crushing device for coal mining according to claim 1, characterized in that, The inner wall of the shell (1) is provided with several strip teeth (11) arranged in a ring. The cross-section of the strip teeth (11) is trapezoidal.

7. The coal crushing device for coal mining according to claim 1, characterized in that, A protective plate (12) is vertically provided on the upper surface of the shell (1), and a motor (2) is installed on the side of the protective plate (12) away from the feed inlet (16).

8. The coal crushing device for coal mining according to claim 1, characterized in that, A lifting ring (13) is provided on the upper surface of the housing (1).

9. The coal crushing device for coal mining according to claim 1, characterized in that, The upper surface of the upper grinding disc (4) is an inclined surface 1 (41) that is inclined toward the axis, the upper surface of the lower grinding disc (5) is an inclined surface 3 (52) that is inclined toward the circumference, and the lower surface of the upper grinding disc (4) is provided with an inclined surface 2 (42) that is adapted to the upper surface of the lower grinding disc (5).

10. The coal crushing device for coal mining according to claim 1, characterized in that, The bottom of the shell (1) is provided with flange one (14), and the top of the discharge hopper (6) is provided with flange two (61) that is compatible with flange one (14). Several support legs (62) are provided on the lower surface of flange two (61).

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