Coal briquette crushing and grinding device for thermal power generation

Abstract

The utility model relates to the technical field of thermal power generation, in particular to a coal briquette crushing and grinding device for thermal power generation. Comprising a box body, a motor is fixedly arranged at the top of the box body through a support, the lower end of an output shaft of the motor penetrates through the upper side wall of the box body and is coaxially and fixedly connected with a main shaft, a smashing and grinding assembly is arranged on the side wall of the main shaft, and two screening net plates are symmetrically arranged in the box body; the two screening net plates are combined to form an inverted V-shaped structure, the screening net plates are arranged below the smashing and grinding assembly, the sides, close to the main shaft, of the screening net plates are located at the high position, the screening net plates and the side wall of the main shaft are rotationally arranged, and vibration mechanisms are arranged on the lower sides of the two screening net plates. According to the utility model, after the screening net plate screens pulverized coal which is primarily ground, the auger blades throw screened large-particle coal briquettes into the box body again for re-grinding, so that workers do not need to carry out secondary grinding on the coal briquettes, manpower is saved, and the labor intensity of the workers is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal power generation, in particular to a coal block crushing and grinding device for thermal power generation. Background Art

[0002] Coal blocks are often used as combustion raw materials in thermal power generation. Before combustion, the coal blocks need to be crushed and pre-processed to process the coal blocks into coal powder, making them easier to burn inside the boiler.

[0003] The existing coal block crushing and grinding device will mix larger particles of coal in the coal powder obtained after the initial crushing and grinding of the coal blocks. In order to ensure the quality of the coal powder, the coal blocks in the coal powder need to be screened out, and the screened coal blocks need to be ground again to improve the utilization rate of the coal blocks. At present, the step of putting the coal blocks into the crushing and grinding device for re-grinding is usually completed by workers, which increases the labor intensity of the workers. In view of this, we propose a coal block crushing and grinding device for thermal power generation. Summary of the Invention

[0004] The purpose of the utility model is to provide a coal block crushing and grinding device for thermal power generation to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned objectives, one of the objectives of the present utility model is to provide a coal block crushing and grinding device for thermal power generation, comprising a box body, a motor is fixedly arranged on the top of the box body through a bracket, the lower end of the motor output shaft passes through the upper side wall of the box body and is coaxially fixedly connected to the main shaft, a crushing and grinding assembly is provided on the side wall of the main shaft, two screening mesh plates are symmetrically arranged inside the box body, the two screening mesh plates are combined into an inverted V-shaped structure, the screening mesh plates are arranged below the crushing and grinding assembly, a vibration mechanism is provided on the lower side of the two screening mesh plates, and the vibration mechanism is used to drive the screening mesh plates to move vertically back and forth, two lifting chambers are symmetrically provided inside the box body, an extension shaft is provided for rotation inside the lifting chamber, an auger blade is fixedly connected to the side wall of the extension shaft, a feed trough and a discharge trough are provided on the side wall of the lifting chamber, and the feed trough and the discharge trough connect the lifting chamber and the interior of the box body, the discharge trough is located above the crushing and grinding assembly, and a transmission mechanism is provided between the two extension shafts and the main shaft.

[0006] As a further improvement of the present technical solution, the crushing and grinding assembly includes a rotating grinding disc coaxially fixedly connected to the side wall of the main shaft, a fixed grinding disc fixedly connected to the inner wall of the box body, a gap is provided between the rotating grinding disc and the fixed grinding disc, and the width of the gap gradually decreases from top to bottom, a plurality of crushing teeth are fixedly connected to the side of the rotating grinding disc close to the gap, the fixed grinding disc is an annular structure, and a discharge groove is provided between the inner ring of the fixed grinding disc and the side wall of the main shaft.

[0007] As a further improvement of the present technical solution, the vibration mechanism includes a crossbeam fixedly connected to the inner wall of the box, and two sleeves are symmetrically fixedly connected to the upper surface of the crossbeam. A sliding rod is slidingly arranged inside the sleeve, and a spring is fixedly connected between the lower end of the slide rod and the upper surface of the crossbeam. The upper ends of the two slide rods are respectively fixedly arranged on the lower side of the two screening mesh plates, and an elliptical wheel is coaxially fixedly connected to the side wall of the main shaft. When the main shaft drives the elliptical wheel to rotate, the two ends of the elliptical wheel respectively push the two screening mesh plates to move upward.

[0008] As a further improvement of the present technical solution, the transmission mechanism includes two driving wheels coaxially fixedly connected to the side wall of the main shaft, the driving wheel is arranged above the box body, the upper end of the extension shaft passes through the upper side wall of the lifting chamber and is coaxially fixedly connected to a driven wheel, the two driven wheels are respectively arranged corresponding to the two driving wheels, and the corresponding driven wheels and driving wheels are at the same height, and a transmission belt is connected between the driven wheel and the corresponding driving wheel.

[0009] As a further improvement of the present technical solution, a feed pipe is fixedly connected to the top of the box body, and a discharge pipe is fixedly connected to the bottom of the box body.

[0010] As a further improvement of the present technical solution, the bottom surfaces inside the feed trough and the discharge trough are both set as inclined surfaces, the inclined surface on the feed trough is located at a high position at one end close to the main shaft, and the inclined surface on the discharge trough is located at a high position at one end away from the main shaft. The two screening mesh plates are respectively arranged corresponding to the two feed troughs, and the inclined surfaces on the screening mesh plate and the feed trough have the same inclination direction. The side of the screening mesh plate away from the main shaft is in sliding contact with the inner wall of the box body, and the lowest point on the side of the screening mesh plate is lower than the top surface inside the feed trough and higher than the bottom surface inside the feed trough. The main shaft is rotatably set between the two screening mesh plates near the middle section, and when the screening mesh plate moves vertically, relative sliding occurs between the screening mesh plate and the side wall of the main shaft.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The coal block crushing and grinding device for thermal power generation, after the screening mesh screens the coal powder after the initial grinding, the auger blades will put the large-particle coal blocks screened out into the box again for re-grinding, so that workers do not need to spend manpower on the second grinding of the coal blocks, reducing the labor intensity of workers.

[0013] 2. In the coal crushing and grinding device for thermal power generation, when the main shaft drives the rotating grinding disc to crush and grind the coal, the main shaft pushes the screening mesh plate upward through the elliptical wheel, so that the screening mesh plate cooperates with the spring to realize vertical reciprocating vibration, making the mesh of the screening mesh plate less likely to be blocked by coal powder, thereby improving the screening efficiency of the screening mesh plate for coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is one of the cross-sectional views of the overall structure of the utility model;

[0016] Figure 3 For the utility model Figure 2 Schematic diagram of the structure at A in the middle;

[0017] Figure 4 This is a schematic structural diagram of the auger blades, rotating grinding disc and elliptical wheel of the utility model;

[0018] Figure 5 This is the second sectional view of the overall structure of the utility model.

[0019] The meaning of each number in the figure is:

[0020] 1. Box body; 11. Feed pipe; 12. Discharge pipe; 13. Fixed grinding disc; 14. Lifting chamber; 15. Feed chute; 16. Discharge chute; 17. Discharge chute;

[0021] 2. Motor;

[0022] 3. Spindle; 31. Rotating grinding disc;

[0023] 4. Screening mesh;

[0024] 5. Extension shaft; 51. Auger blade;

[0025] 6. Vibration mechanism; 61. Crossbeam; 62. Sleeve; 63. Sliding rod; 64. Spring; 65. Elliptical wheel;

[0026] 7. Transmission mechanism; 71. Driven pulley; 72. Driving pulley; 73. Transmission belt. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts are within the scope of protection of the present invention. Example

[0028] See also Figure 1As shown, the purpose of this embodiment is to provide a coal block crushing and grinding device for thermal power generation, including a box body 1, a feed pipe 11 is fixedly connected to the top of the box body 1, a discharge pipe 12 is fixedly connected to the bottom of the box body 1, a motor 2 is fixedly provided on the top of the box body 1 through a bracket, the lower end of the output shaft of the motor 2 passes through the upper side wall of the box body 1 and is coaxially fixedly connected to the main shaft 3, and a crushing and grinding assembly is provided on the side wall of the main shaft 3. After the coal block is put into the interior of the box body 1 through the feed pipe 11, the crushing and grinding assembly crushes the coal block into coal powder. The structure of the crushing and grinding assembly is detailed below, with reference to Figure 2 The crushing and grinding assembly includes a rotating grinding disc 31 coaxially fixedly connected to the side wall of the main shaft 3, a fixed grinding disc 13 is fixedly connected to the inner wall of the box body 1, a gap is set between the rotating grinding disc 31 and the fixed grinding disc 13, and the width of the gap gradually decreases from top to bottom, a plurality of crushing teeth are fixedly connected to the side of the rotating grinding disc 31 close to the gap, the fixed grinding disc 13 is an annular structure, and a discharge groove 17 is set between the inner ring of the fixed grinding disc 13 and the side wall of the main shaft 3, and the upper side of the rotating grinding disc 31 is set to a conical surface. When the coal block falls on the upper side of the rotating grinding disc 31, The coal block slides along the upper side of the rotating grinding disc 31 onto the fixed grinding disc 13, and then slides along the upper side of the fixed grinding disc 13 into the gap. When the motor 2 drives the main shaft 3 to rotate, so that the main shaft 3 drives the rotating grinding disc 31 to rotate, the rotating grinding disc 31 crushes and grinds the coal block in the gap. The coal block that is crushed and ground into smaller particles will slide downward inside the gap. When the coal block slides out of the gap, the coal block falls to the bottom of the fixed grinding disc 13 through the discharge groove 17, completing one grinding of the coal block, so that the larger particles of coal block are ground into smaller particles of coal powder.

[0029] After the coal blocks are ground once, there will still be large particles of coal blocks in the coal powder that falls under the fixed grinding disc 13. The presence of large particles of coal blocks will reduce the quality of the coal powder and affect the combustion efficiency of the coal powder inside the boiler. In order to solve this problem, two screening mesh plates 4 are symmetrically arranged inside the box 1. The screening mesh plates 4 are made of steel plates with a number of small through holes on the surface. The side of the screening mesh plate 4 away from the main shaft 3 is in sliding contact with the inner wall of the box 1. The two screening mesh plates 4 are combined into an inverted The V-shaped structure is arranged, and the main shaft 3 is rotated near the middle section and is set between the two screening mesh plates 4. The screening mesh plates 4 are arranged below the crushing and grinding components. When the coal powder mixed with coal blocks falls on the upper surface of the screening mesh plates 4, the coal powder falls below the screening mesh plates 4 through the mesh holes of the screening mesh plates 4, and then is discharged from the box body 1 through the discharge pipe 12 to end the grinding. The coal blocks with larger particles cannot pass through the mesh holes of the screening mesh plates 4 and are retained on the upper side of the screening mesh plates 4. In order to improve the quality of the coal powder, it is necessary to separate the coal powder from the mesh holes of the screening mesh plates 4. The coal blocks are screened out, so two lifting chambers 14 are symmetrically opened inside the box body 1, and the side walls of the lifting chamber 14 are provided with a feed chute 15 and a discharge chute 16, and the feed chute 15 and the discharge chute 16 connect the lifting chamber 14 with the interior of the box body 1, and the discharge chute 16 is located above the crushing and grinding assembly, and the feed chute 15 is located below the crushing and grinding assembly. The bottom surfaces of the feed chute 15 and the discharge chute 16 are both inclined. The inclined surface on the feed chute 15 is close to the end of the main shaft 3 and is located at a high position, and the discharge chute 16 is located at a high position. The end of the inclined surface away from the main shaft 3 is located at a high place, and the two screening mesh plates 4 are respectively arranged corresponding to the two feed troughs 15. The inclined surfaces on the screening mesh plate 4 and the feed trough 15 have the same inclination direction. The lowest point of the upper side of the screening mesh plate 4 is lower than the top surface inside the feed trough 15 and higher than the bottom surface inside the feed trough 15. The coal blocks retained on the upper side of the screening mesh plate 4 will slide through the feed trough 15 to the inside of the lifting chamber 14, avoiding the accumulation of coal blocks on the screening mesh plate 4 to block the mesh holes, thereby reducing the efficiency of the screening mesh plate 4 in filtering coal powder.

[0030] The workers need to put the coal blocks inside the lifting chamber 14 back into the rotating grinding wheel 31 and the fixed grinding wheel 13 for secondary grinding, but it takes a lot of physical strength for the workers to manually transfer the coal blocks inside the lifting chamber 14. To solve this problem, an extension shaft 5 is provided for rotation inside the lifting chamber 14, and an auger blade 51 is fixedly connected to the side wall of the extension shaft 5. A transmission mechanism 7 is provided between the two extension shafts 5 and the main shaft 3. When the main shaft 3 rotates, the extension shaft 5 and the auger blade 51 will be driven to rotate through the transmission mechanism 7. The rotating auger blade 51 will lift the coal blocks inside the lifting chamber 14 upward. When the coal blocks are lifted to the same height as the discharge chute 16 by the auger blade 51, the coal blocks are discharged to the fixed grinding wheel 13 through the discharge chute 16, so that the rotating grinding wheel 31 and the fixed grinding wheel 13 cooperate to perform secondary grinding on this part of the coal blocks, thereby automatically performing secondary grinding on the coal blocks inside the lifting chamber 14, reducing the labor intensity of the workers and improving the efficiency of the device in grinding and producing coal powder.

[0031] The structure of the transmission mechanism 7 is detailed below. Figure 2 and Figure 4 The transmission mechanism 7 includes two driving wheels 72 coaxially fixedly connected to the side walls of the main shaft 3. The driving wheel 72 is arranged above the box body 1, and the upper end of the extension shaft 5 passes through the upper side wall of the lifting chamber 14 and is coaxially fixedly connected to the driven wheel 71. The two driven wheels 71 are respectively arranged corresponding to the two driving wheels 72, and the corresponding driven wheels 71 and the driving wheels 72 are at the same height. A transmission belt 73 is connected between the driven wheel 71 and the corresponding driving wheel 72. When the output shaft of the motor 2 drives the main shaft 3 to rotate, the main shaft 3 drives the two driving wheels 72 to rotate, and the driving wheel 72 drives the driven wheel 71 to rotate through the transmission belt 73. The driven wheel 71 drives the extension shaft 5 and the auger blade 51 to rotate, so that the main shaft 3 can drive the two auger blades 51 to rotate synchronously, so that the auger blades 51 continuously transport the coal blocks inside the lifting chamber 14 to the inside of the box body 1 for secondary grinding, thereby reducing the labor intensity of the workers.

[0032] If the screening mesh plate 4 is in a stationary state during the process of filtering the coal powder, the coal powder will easily accumulate on the upper layer of the large-particle coal blocks and will not be able to pass through the mesh. At the same time, the coal powder will easily clog the mesh, reducing the efficiency of the screening mesh plate 4 in screening the coal powder. To solve this problem, a vibration mechanism 6 is provided on the lower side of the two screening mesh plates 4. The vibration mechanism 6 is used to drive the screening mesh plates 4 to move back and forth vertically. The structure of the vibration mechanism 6 is detailed below. Figure 2-Figure 5The vibration mechanism 6 includes a crossbeam 61 fixedly connected to the inner wall of the box body 1. The side wall of the main shaft 3 is rotatably arranged with the crossbeam 61 near the lower end. The crossbeam 61 can improve the stability of the main shaft 3 when it rotates. The upper surface of the crossbeam 61 is symmetrically fixedly connected with two sleeves 62. The inner sliding of the sleeve 62 is provided with a slide rod 63. The slide rod 63 and the sleeve 62 are both vertically arranged so that the screening mesh plate 4 can only move vertically along the axis direction of the slide rod 63. A spring 64 is fixedly connected between the lower end of the slide rod 63 and the upper surface of the crossbeam 61. The two slides The upper ends of the rods 63 are respectively fixedly arranged on the lower sides of the two screening mesh plates 4, and the side walls of the main shaft 3 are coaxially fixedly connected with an elliptical wheel 65. The edges of the upper surfaces of the elliptical wheel 65 are polished into smooth arc surfaces. Relative sliding occurs between the screening mesh plates 4 and the smooth arc surfaces on the elliptical wheel 65. When the main shaft 3 drives the elliptical wheel 65 to rotate, the elliptical wheel 65 is located at both ends of the long axis and contacts the side walls of the two screening mesh plates 4 respectively. During the contact process between the elliptical wheel 65 and the screening mesh plates 4, the elliptical wheel 65 rotates all the time. During the process, the elliptical wheel 65 lifts the screening mesh plate 4 upward, so that the screening mesh plate 4 moves upward, and the upwardly moved screening mesh plate 4 drives the slide bar 63 away from the cross beam 61, so that the spring 64 is elastically stretched. At this time, the spring 64 is stretched, and when the long axis of the elliptical wheel 65 and the connection position of the two screening mesh plates 4 form an included angle of 90 degrees, the elliptical wheel 65 lifts the screening mesh plate 4 to the highest point. When the elliptical wheel 65 continues to rotate, the elliptical wheel 65 no longer pushes the screening mesh plate 4 upward. At this time, the screening mesh plate 4 is pulled downward by the spring 64. When the elliptical wheel 65 is out of contact with the screening mesh plate 4, the screening mesh plate 4 moves to the lowest point. Through the rotation of the elliptical wheel 65, the screening mesh plate 4 can move up and down in the vertical direction. In this way, the vertical reciprocating vibration of the screening mesh plate 4 is realized. The distance that the screening mesh plate 4 moves from the lowest point to the highest point is the vibration amplitude of the screening mesh plate 4. Through the reciprocating vibration of the screening mesh plate 4, the coal powder on the screening mesh plate 4 is vibrated, so that the mesh of the screening mesh plate 4 is not easily blocked by the coal powder, thereby improving the screening efficiency of the screening mesh plate 4 for the coal powder.

[0033] 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 to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A coal crushing and grinding device for thermal power generation, comprising a housing (1), characterized in that: A motor (2) is fixedly provided on the top of the box (1) via a bracket, the lower end of the output shaft of the motor (2) passes through the upper side wall of the box (1) and is coaxially fixedly connected to the main shaft (3), a crushing and grinding assembly is provided on the side wall of the main shaft (3), two screening mesh plates (4) are symmetrically provided inside the box (1), the two screening mesh plates (4) are combined into an inverted V-shaped structure, the screening mesh plates (4) are provided below the crushing and grinding assembly, and a vibration mechanism (6) is provided on the lower side of the two screening mesh plates (4), the vibration mechanism (6) is used to drive the screening mesh plates (4) to move vertically. The box (1) is symmetrically provided with two lifting chambers (14) inside, and an extension shaft (5) is provided inside the lifting chamber (14) for rotation. A screw blade (51) is fixedly connected to the side wall of the extension shaft (5). A feed trough (15) and a discharge trough (16) are provided on the side wall of the lifting chamber (14), and the feed trough (15) and the discharge trough (16) connect the lifting chamber (14) and the inside of the box (1). The discharge trough (16) is located above the crushing and grinding assembly. A transmission mechanism (7) is provided between the two extension shafts (5) and the main shaft (3).

2. The coal crushing and grinding device for thermal power generation according to claim 1, characterized in that: The crushing and grinding assembly comprises a rotating grinding disc (31) coaxially fixedly connected to the side wall of the main shaft (3); a fixed grinding disc (13) is fixedly connected to the inner wall of the box body (1); a gap is provided between the rotating grinding disc (31) and the fixed grinding disc (13), and the width of the gap gradually decreases from top to bottom; a plurality of crushing teeth are fixedly connected to the side of the rotating grinding disc (31) close to the gap; the fixed grinding disc (13) is an annular structure, and a discharge groove (17) is provided between the inner ring of the fixed grinding disc (13) and the side wall of the main shaft (3).

3. The coal crushing and grinding device for thermal power generation according to claim 1, characterized in that: The vibration mechanism (6) includes a crossbeam (61) fixedly connected to the inner wall of the box body (1), two sleeves (62) are symmetrically fixedly connected to the upper surface of the crossbeam (61), a slide rod (63) is slidably provided inside the sleeve (62), a spring (64) is fixedly connected between the lower end of the slide rod (63) and the upper surface of the crossbeam (61), the upper ends of the two slide rods (63) are respectively fixedly provided on the lower side of the two screening mesh plates (4), and an elliptical wheel (65) is coaxially fixedly connected to the side wall of the main shaft (3), and when the main shaft (3) drives the elliptical wheel (65) to rotate, the two ends of the elliptical wheel (65) respectively push the two screening mesh plates (4) to move upward.

4. The coal crushing and grinding device for thermal power generation according to claim 1, characterized in that: The transmission mechanism (7) includes two driving wheels (72) coaxially fixedly connected to the side wall of the main shaft (3), the driving wheels (72) are arranged above the box body (1), the upper end of the extension shaft (5) passes through the upper side wall of the lifting chamber (14) and is coaxially fixedly connected to the driven wheel (71), the two driven wheels (71) are respectively arranged corresponding to the two driving wheels (72), and the corresponding driven wheels (71) and driving wheels (72) are at the same height, and a transmission belt (73) is connected between the driven wheel (71) and the corresponding driving wheel (72).

5. The coal crushing and grinding device for thermal power generation according to claim 1, characterized in that: The top of the box body (1) is fixedly connected to a feed pipe (11), and the bottom of the box body (1) is fixedly connected to a discharge pipe (12).

6. The coal crushing and grinding device for thermal power generation according to claim 1, characterized in that: The bottom surfaces of the feed trough (15) and the discharge trough (16) are both inclined surfaces. The inclined surface on the feed trough (15) is located at a high position at one end close to the main shaft (3), and the inclined surface on the discharge trough (16) is located at a high position at one end away from the main shaft (3). The two screening mesh plates (4) are respectively arranged corresponding to the two feed troughs (15). The inclined surfaces on the screening mesh plates (4) and the feed trough (15) have the same inclination direction. The side of the screening mesh plate (4) away from the main shaft (3) is in sliding contact with the inner wall of the box body (1). The lowest point of the upper side surface of the screening mesh plate (4) is lower than the top surface of the feed trough (15) and higher than the bottom surface of the feed trough (15). The main shaft (3) is rotatably arranged between the two screening mesh plates (4) near the middle section, and when the screening mesh plate (4) moves vertically, relative sliding occurs between the screening mesh plate (4) and the side wall of the main shaft (3).

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