Automatic screening equipment for coal mining

Abstract

The invention relates to the technical field of coal mining, in particular to automatic screening equipment for coal mining, which comprises a first screening pool and a second screening pool communicated with each other, and further comprises two fixing plates symmetrically fixed in the first screening pool, a mounting space is isolated in the first screening pool; the conveying assembly is installed between the two fixing plates and used for clamping the raw stones in the raw stone conveying process; the high-pressure assembly is used for carrying out high-pressure washing on the raw stones clamped and conveyed by the conveying assembly; the water separation assembly is mounted on the second screening pool; according to the device, through the arrangement of the conveying assembly, soil and gravel attached to the raw coal stones can be separated before the raw coal stones enter the water separation assembly for water separation, and therefore the situation that impurities enter coal or part of coal is separated into the impurities during water separation is avoided advantageously.

Description

Technical Field

[0001] The invention relates to the field of coal mining, and in particular to an automatic screening device used in coal mining. Background Art

[0002] Automatic screening in coal mining refers to the process of grading, screening and processing coal using automated equipment and systems during coal mining. This technology can significantly improve the quality and production efficiency of coal, while reducing labor costs and improving safety.

[0003] Coal wet separation is a commonly used coal processing method, which uses water or other liquid media to separate coal to remove impurities and improve the purity and quality of coal. Wet separation mainly includes gravity separation, flotation and water washing.

[0004] However, when separating by wet sorting, if there is a large amount of soil or sand and gravel attached to the coal raw stone, it will affect the accuracy of coal sorting, causing part of the coal to be sorted into the impurities, or part of the impurities to be sorted together with the coal, affecting the accuracy of coal sorting. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an automatic screening device for coal mining.

[0006] In a first aspect, the present invention provides an automatic screening device for coal mining, comprising a first screening pool and a second screening pool, wherein the second screening pool is connected to the first screening pool, and further comprising:

[0007] Two fixing plates are symmetrically fixed inside the first screening tank to isolate an installation space inside the first screening tank;

[0008] A conveying assembly, installed between the two fixed plates, for clamping the raw stone during the conveying process;

[0009] The high-pressure component is used to perform high-pressure washing on the raw stone held and conveyed by the conveying component, so as to separate the coal blocks from the soil and sand in the raw stone by the high-pressure water flow;

[0010] A water separation assembly is installed in the second screening tank, and is used to transport the coal blocks and soil and gravel separated by the first screening tank in layers under the action of buoyancy;

[0011] The mined raw coal is transported to the first screening pool through the conveyor belt, so that the raw coal is transported to the inside of the conveying component. After the raw coal enters the inside of the conveying component, the conveying component clamps the raw coal, so that the raw coal is clamped and positioned up and down during the transportation process. By controlling the density of the raw coal, the raw coal is in a loose state when it is transported to the inside of the conveying component. With the transportation of the conveying component, the clamped raw coal is further pulled and spread, so that there are gaps between the raw coal.

[0012] During the process of the raw coal being clamped and conveyed inside the conveying component, the high-pressure component conveys high-pressure water flow to the raw coal, so that the high-pressure water flow impacts the raw coal being clamped and conveyed, so that the soil and sand and gravel attached to the raw coal are impacted and separated under the impact force of the high-pressure water flow, which is conducive to separating the soil and sand and gravel attached to the raw coal before the raw coal enters the water separation component for water separation, thereby helping to avoid the situation where impurities enter the coal or part of the coal is sorted into the impurities during water separation;

[0013] The water separation component can sort the coal and impurities after impact separation, making the coal float up and the impurities sink, thereby realizing automatic screening of the coal.

[0014] Preferably, the conveying assembly comprises:

[0015] Two groups of movable plates, a plurality of movable plates form one group, and the two groups of movable plates are symmetrically slidably installed in the inner part of the waist-shaped sliding groove opened on the fixed plate;

[0016] A plurality of telescopic frames, each of which is installed between adjacent movable plates through a slider, so that the adjacent movable plates can be extended or retracted by the telescopic frames;

[0017] Two driving assemblies are symmetrically mounted on the two ends of the lower group of moving plates, and are used to drive the lower group of moving plates to extend through the telescopic frame when sliding to the upper horizontal position, so as to drive the clamped rough stones to spread out;

[0018] The driving assembly can drive the moving plate to move, so that the moving plate at the bottom moves actively. When the raw coal enters between the two sets of moving plates, the moving plate at the top cooperates with the moving plate at the bottom to clamp the raw coal entering between the two sets of moving plates. Then, under the driving action of the driving assembly, the moving plate at the bottom moves, and the raw coal and the moving plate at the top move synchronously through the moving plate at the bottom, so that the upper and lower moving plates clamp the raw coal and drive the raw coal to move.

[0019] The movable plate below is driven by the driving assembly to move, so that the adjacent movable plates are pulled and stretched through the telescopic frame, so that the clamped coal raw stones are separated, which is beneficial to increase the gap between the coal raw stones, thereby facilitating the increase of the impact space of the water flow on the coal raw stones after the coal raw stones are separated, and facilitating the sufficient impact separation of the soil and sand and gravel attached to the coal raw stones, thereby facilitating the improvement of the screening effect of the coal raw stones.

[0020] Preferably, the drive assembly comprises:

[0021] A motor, fixed on the outer wall of the first screening tank;

[0022] Two synchronous wheels are both rotatably installed inside the installation space, and the motor drives one of the synchronous wheels to rotate through the output shaft;

[0023] A synchronous belt, which is installed on the outer rings of the two synchronous wheels;

[0024] A plurality of first limit blocks are fixed on the outer wall of the synchronous belt in a linear array along the track of the synchronous belt;

[0025] A plurality of through slots are respectively formed inside the sliding rods fixed at the ends of the movable plates, and the first limit blocks are adapted to the through slots;

[0026] After the motor is started, the output shaft drives the synchronous wheel connected to it to rotate, the synchronous wheel drives the synchronous belt transmission, the synchronous belt drives the first limit block transmission, and the first limit block is inserted into the through groove during the transmission process, thereby pulling the rear movable plate to expand and pushing the front movable plate to retract, thereby realizing the driving of the movable plate.

[0027] Preferably, the drive assembly further comprises:

[0028] A second limiting block is vertically slidably mounted on a side wall of the fixing plate located on one side of the installation space;

[0029] A first cylinder is fixed inside the installation space and drives the second limit block to move vertically through a telescopic rod;

[0030] A third limiting block is vertically slidably mounted on a side wall of the fixing plate located on one side of the installation space;

[0031] A second cylinder is fixed inside the installation space, and drives the third limit block to move vertically through the telescopic rod, and the second limit block and the third limit block limit the movable plate when they move vertically alternately, so that the movable plate is unfolded in sequence by stretching the telescopic frame;

[0032] The first cylinder drives the second limit block to move vertically, and the second limit block can block the unfolded moving plate, thereby preventing the unfolded moving plate at the rear from moving together, thereby making the unfolding distances between adjacent moving plates inconsistent, resulting in the first limit block and the through groove being unable to adapt to each other. Through the blocking of the second limit block, the unfolded moving plate at the rear will not move together when blocked, and the moving plate behind the blocked moving plate at the rear will be blocked by the third limit block. When the second limit block moves upward to clear the blocking of the moving plate, the remaining moving plates at the rear will be blocked by the third limit block. , so that the movable plate that has been let go can be pulled and unfolded when the driving assembly drives the movable plate in front to move, and the remaining movable plates at the rear will not move and unfold together, and then the second limit block moves downward and resets, at this time the second cylinder drives the third limit block to move upward to cancel the blockage, so that the remaining movable plates at the rear move to fill the position and are blocked by the second limit block, and then the third limit block resets to block the remaining movable plates behind the movable plate after filling the position, thereby realizing a single drive to unfold the movable plate, so that the distance between adjacent movable plates after unfolding is synchronized, so that the movable plate drives the coal raw stone to unfold evenly for high-pressure water flow impact.

[0033] Preferably, the conveying assembly further comprises:

[0034] A plurality of groups of rotating grooves, wherein a plurality of the rotating grooves form a group, and each group of the rotating grooves is respectively arranged in a linear array on the top of the movable plate;

[0035] A plurality of rotating disks are arranged corresponding to the rotating grooves one by one and are rotatably installed in the corresponding rotating grooves respectively;

[0036] A rotating disk is installed inside the rotating trough, so that when the upper and lower movable plates clamp and transport the coal raw stone, the coal raw stone is clamped between the rotating disks, so that the coal raw stone can rotate under the impact of the high-pressure water flow when it is impacted by the high-pressure water flow, so that after the coal raw stone rotates, the impact range of the high-pressure water flow on the coal raw stone can be increased, which is beneficial for the soil and sand and gravel attached to the coal raw stone around to be separated by the impact force, which is beneficial for improving the separation effect between the coal raw stone and the soil and sand and gravel.

[0037] Preferably, the conveying assembly further comprises:

[0038] A plurality of first cylinders are respectively fixed to the bottom of each of the rotating disks;

[0039] A plurality of second cylinders are rotatably mounted inside the respective rotating grooves and are plug-connected with the respective first cylinders;

[0040] A plurality of springs are respectively fixed between the first cylinder and the second cylinder which are correspondingly inserted;

[0041] The first cylinder and the second cylinder are plugged into and connected to each other, so that when the coal ore raw stones are impacted by the high-pressure water flow and drive the rotating disk to rotate, the rotating disk drives the first cylinder to rotate, and the first cylinder drives the second cylinder plugged into and connected to it to rotate, so that the first cylinder and the second cylinder can be extended and retracted while rotating, and the elastic force of the spring supports and pushes the second cylinder to move upward, so that the second cylinder can be extended and retracted within a certain range, which is conducive to clamping coal ore raw stones of different sizes, thereby helping to increase the number of coal ore raw stones clamped and positioned, and thus helping to clamp and impact them to separate the attached coal and impurities.

[0042] Preferably, the water separation component comprises:

[0043] A water outlet head is fixed to the top of one end of the second screening tank facing the first screening tank, and the water outlet head is connected to an external water source to transport water to the interior of the second screening tank;

[0044] A guide plate, fixed to the bottom of one end of the second screening pool facing the first screening pool, used to guide the raw stones transported by the movable plate to the direction of the second screening pool to the bottom of the second screening pool for buffering;

[0045] A screening plate, fixed to the middle of one end of the second screening tank facing away from the first screening tank, for physically isolating the coal blocks and impurities separated by water buoyancy into two spaces;

[0046] The water outlet head can input a stable water flow into the interior of the second screening pool, and the guide plate can guide the coal raw stone after the high-pressure impact separation, so that the coal raw stone can smoothly enter the interior of the second screening pool, which is beneficial to avoid the coal raw stone entering the second screening pool. The impact force is too large, resulting in excessive water flow fluctuations in the second screening pool, thereby affecting the water separation effect. The coal raw stone is separated by water separation in the second screening pool, so that the coal floats upward and the impurities settle downward. Then, the floating and settled coal and impurities are separated by the screening plate, so that the coal floating upward can be transported by the subsequent conveyor belt for the next step of drying, and the impurities settled below are also transported and collected for the same treatment. The soil and sand and gravel attached to the coal raw stone after high-pressure flushing are separated, so that when the coal raw stone enters the second screening pool for water separation, the interference of the attached soil and sand and gravel can be reduced, which is beneficial to improve the automatic screening efficiency of coal.

[0047] Preferably, the water separation component further comprises:

[0048] A plurality of third cylinders, all fixed to the bottom of the second screening tank, are used to jointly drive the screening plate to move vertically through a telescopic rod;

[0049] The third cylinder can drive the screening plate to move vertically through the telescopic rod, so as to adjust the height of the screening plate according to the water depth inside the second screening pool and the state of the coal, which is conducive to completely separating the coal and impurities.

[0050] Preferably, the high voltage assembly comprises:

[0051] A plurality of high-pressure nozzles are divided into two groups and fixed to opposite sides of the two fixed plates respectively, so as to perform high-pressure washing on the raw stones transported by the movable plate;

[0052] A box body, fixed between the two fixed plates and located at the center of the moving track of the moving plate;

[0053] A filter plate is fixed to the middle of the box;

[0054] A drainage box is fixed to one end of the box body facing the second screening pool, and a water outlet hole connected to the second screening pool is formed through the side wall of the drainage box;

[0055] A water pump is fixed to the box body at a position below the filter plate, and the output end of the water pump is connected to the drainage box;

[0056] The high-pressure nozzle can be connected to an external water source to deliver water between the two sets of moving plates at high pressure, so that the coal raw stone is washed by the high-pressure water flow, and the soil and sand and gravel attached to the coal raw stone are separated. The two sets of high-pressure nozzles are staggered so that when the high-pressure nozzle impacts the coal raw stone, if the coal raw stone can rotate, it will rotate under the impact of the high-pressure water flow, so that the high-pressure water flow impacts the coal raw stone around, which is conducive to improving the separation effect of the coal raw stone and soil sand and gravel impurities;

[0057] After the high-pressure water flow impact is completed, it enters the interior of the box. Under the filtering action of the filter plate inside the box, the impurities scattered during the high-pressure water flow impact can be filtered and separated by the filter plate, and the water passes through the filter plate into the interior of the box. Then, under the action of the water pump, the water flow is transported to the drainage box, so that the water flow is discharged through the water outlet inside the drainage box. On the one hand, after the water flow is discharged, the water flow will not accumulate inside the box, thereby avoiding the accumulation of water flow, which makes it difficult for impurities and water flow after the high-pressure impact to enter the interior of the box, but enter the gap between the fixed plate and the first screening pool, causing obstacles to the movement of the moving plate. On the other hand, the discharged water flow can assist the flow of impurities or coal moving with the moving plate, so that the water flow drives the impurities or coal into the interior of the second screening pool, which is conducive to avoiding the situation where small impurities or coal move with the moving plate but do not enter the interior of the second screening pool.

[0058] Preferably, the high voltage component further comprises:

[0059] Two negative pressure boxes are symmetrically fixed on both sides of the top of the drainage box;

[0060] Two negative pressure pumps are respectively fixed on both sides of the drainage box, and the input ends of the two negative pressure pumps are respectively fixed with connecting pipes, and the two connecting pipes are respectively connected to the two negative pressure boxes;

[0061] Two filter sheets are respectively fixed to one end of the two connecting pipes facing the negative pressure box;

[0062] The negative pressure pump can be connected to the negative pressure box through a connecting pipe, so that negative pressure is generated inside the negative pressure box. Under the action of negative pressure, impurities and water that may flow along the end edge of the movable plate into the gap of the fixed plate are promoted to enter the interior of the negative pressure box. Subsequently, under the action of the filter plate, the water flow is discharged through the filter plate into the box body, and the impurities are filtered and separated, thereby preventing the impurities from entering the gap of the fixed plate and obstructing the movable plate.

[0063] Compared with the prior art, the present invention has the following beneficial effects:

[0064] 1. The present invention, through the arrangement of the conveying component, can separate the soil and sand and gravel attached to the coal raw stone before the coal raw stone enters the water separation component for water separation, thereby helping to avoid the situation in which impurities enter the coal or part of the coal is sorted into the impurities during water separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0066] Figure 2 The structure of the present invention after the overall section is schematically shown. Figure 1 .

[0067] Figure 3 For the present invention Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0068] Figure 4 For the present invention Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0069] Figure 5 The structure of the present invention after the overall section is schematically shown. Figure 2 .

[0070] Figure 6 For the present invention Figure 5 Schematic diagram of the enlarged structure at point C in the middle.

[0071] Figure 7 The structure of the present invention after the overall section is schematically shown. Figure 3 .

[0072] Figure 8 For the present invention Figure 7 Schematic diagram of the enlarged structure at D in the middle.

[0073] In the figure: 1. first screening tank; 101. fixed plate; 2. movable plate; 201. mounting groove; 202. slider; 203. telescopic frame; 204. sliding rod; 3. first limit block; 301. through groove; 302. synchronous belt; 303. synchronous wheel; 304. motor; 4. second limit block; 401. first cylinder; 402. third limit block; 403. second cylinder; 5. rotating disk; 501. rotating groove; 6. spring; 601. first cylinder; 602. second cylinder; 7. second screening tank; 701. water outlet; 702. guide plate; 8. screening plate; 9. third cylinder; 10. high-pressure nozzle; 11. box body; 1101. filter plate; 12. drainage box; 1201. water outlet; 1202. water pump; 13. negative pressure box; 1301. negative pressure pump; 1302. connecting pipe. DETAILED DESCRIPTION

[0074] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0075] like Figures 1 to 8 The automatic screening equipment used in coal mining shown in the figure comprises a first screening pool 1 and a second screening pool 7, wherein the second screening pool 7 is connected to the first screening pool 1, and further comprises:

[0076] Two fixing plates 101 are symmetrically fixed inside the first screening tank 1 to isolate an installation space inside the first screening tank 1;

[0077] A conveying assembly, installed between the two fixed plates 101, is used to clamp the raw stone during the process of conveying the raw stone;

[0078] The high-pressure component is used to perform high-pressure washing on the raw stone held and conveyed by the conveying component, so as to separate the coal blocks from the soil and sand in the raw stone by the high-pressure water flow;

[0079] The water separation assembly is installed in the second screening tank 7 and is used to transport the coal blocks and soil and gravel separated by the first screening tank 1 in layers under the action of buoyancy;

[0080] Coal wet separation is a commonly used coal processing method, which uses water or other liquid media to separate coal to remove impurities and improve the purity and quality of coal. Wet separation mainly includes gravity separation, flotation and water washing;

[0081] However, when the coal is separated by wet separation, if there is a large amount of soil or sand attached to the raw coal, it will affect the accuracy of coal separation, causing part of the coal to be separated into impurities, or part of the impurities to be separated together with the coal, affecting the accuracy of coal separation.

[0082] This embodiment of the present invention can solve the above problems. The specific implementation method is as follows: the mined coal raw stone is transported to the first screening pool 1 through the conveyor belt, so that the coal raw stone is transported to the inside of the conveying component. After the coal raw stone enters the inside of the conveying component, the conveying component clamps the coal raw stone, so that the coal raw stone is clamped and positioned up and down during the transportation process. By controlling the density of the coal raw stone, the coal raw stone is in a loose state when it is transported to the inside of the conveying component. With the transportation of the conveying component, the clamped coal raw stone is further pulled and spread, so that there are gaps between the coal raw stones.

[0083] During the process of the raw coal being clamped and conveyed inside the conveying component, the high-pressure component conveys high-pressure water flow to the raw coal, so that the high-pressure water flow impacts the raw coal being clamped and conveyed, so that the soil and sand and gravel attached to the raw coal are impacted and separated under the impact force of the high-pressure water flow, which is conducive to separating the soil and sand and gravel attached to the raw coal before the raw coal enters the water separation component for water separation, thereby helping to avoid the situation where impurities enter the coal or part of the coal is sorted into the impurities during water separation;

[0084] The water separation component can sort the coal and impurities after impact separation, making the coal float up and the impurities sink, thereby realizing automatic screening of the coal.

[0085] As an optional embodiment, the conveying component includes:

[0086] Two groups of movable plates 2, a plurality of movable plates 2 form one group, and the two groups of movable plates 2 are symmetrically slidably installed in the inner part of the waist-shaped sliding groove opened on the fixed plate 101;

[0087] A plurality of telescopic frames 203, wherein the telescopic frames 203 are respectively installed between adjacent movable plates 2 through sliders 202, so that the adjacent movable plates 2 can be extended or retracted by the telescopic frames 203;

[0088] Two driving assemblies are symmetrically mounted at the two ends of the lower set of moving plates 2, and are used to drive the lower set of moving plates 2 to extend through the telescopic frame 203 when sliding to the upper horizontal position, so as to drive the clamped rough stones to spread out;

[0089] The driving assembly can drive the moving plate 2 to move, so that the moving plate 2 at the bottom moves actively. When the raw coal enters between the two groups of moving plates 2, the moving plate 2 at the top cooperates with the moving plate 2 at the bottom to clamp the raw coal entering between the two groups of moving plates 2. Then, under the driving action of the driving assembly, the moving plate 2 at the bottom moves, and the raw coal and the moving plate 2 at the top move synchronously through the moving plate 2 at the bottom, so that the upper and lower moving plates 2 clamp the raw coal and drive the raw coal to move.

[0090] The movable plate 2 below is driven by the driving assembly to move, so that the adjacent movable plates 2 are pulled and stretched through the telescopic frame 203, so that the clamped coal rough stones are separated, which is beneficial to increase the gap between the coal rough stones, so as to increase the impact space of water flow on the coal rough stones after the coal rough stones are separated, and to make the soil and sand and gravel attached to the coal rough stones be fully impacted and separated, so as to improve the screening effect of the coal rough stones.

[0091] As an optional embodiment, the driving component includes:

[0092] The motor 304 is fixed on the outer wall of the first screening tank 1;

[0093] Two synchronous wheels 303 are both rotatably installed inside the installation space, and the motor 304 drives one of the synchronous wheels 303 to rotate through the output shaft;

[0094] Synchronous belt 302, transmission is installed on the outer rings of two synchronous wheels 303;

[0095] A plurality of first limit blocks 3 are fixed on the outer wall of the synchronous belt 302 in a linear array along the track of the synchronous belt 302;

[0096] A plurality of through slots 301 are respectively provided inside the sliding rods 204 fixed at the ends of the respective moving plates 2, and the first limiting blocks 3 are adapted to the through slots 301;

[0097] After the motor 304 is started, the output shaft drives the synchronous wheel 303 connected thereto to rotate, the synchronous wheel 303 drives the synchronous belt 302 to transmit, the synchronous belt 302 drives the first limit block 3 to transmit, and during the transmission process, the first limit block 3 is inserted into the through groove 301, thereby pulling the rear movable plate 2 to expand and pushing the front movable plate 2 to retract, thereby realizing the driving of the movable plate 2.

[0098] As an optional embodiment, the driving component further includes:

[0099] A second limiting block 4 is vertically slidably mounted on a side wall of the fixing plate 101 located on one side of the installation space;

[0100] The first cylinder 401 is fixed inside the installation space and drives the second limit block 4 to move vertically through the telescopic rod;

[0101] A third limiting block 402 is vertically slidably mounted on a side wall of the fixing plate 101 located in the installation space;

[0102] The second cylinder 403 is fixed inside the installation space, and drives the third limit block 402 to move vertically through the telescopic rod. When the second limit block 402 and the third limit block 402 move vertically alternately, the movable plate 2 is limited, so that the movable plate 2 is sequentially unfolded through the stretching and telescopic frame 203;

[0103] The first cylinder 401 drives the second limit block 4 to move vertically, and can block the unfolded moving plate 2 through the second limit block 4, so as to prevent the unfolded moving plate 2 at the rear from moving together, thereby making the unfolding distances between adjacent moving plates 2 inconsistent, resulting in the first limit block 3 and the through slot 301 being unable to adapt to each other. Through the blocking of the second limit block 4, the unfolded moving plate 2 at the rear will not move together when blocked, and the moving plate 2 behind the blocked moving plate 2 at the rear will be blocked by the third limit block 402. When the second limit block 4 moves upward to clear the blocking of the moving plate 2, the remaining moving plates 2 at the rear are blocked by the third limit block 402. The third limit block 402 is then reset to block the remaining movable plates 2 behind the movable plates 2 after the filling, thereby realizing a single drive to unfold the movable plates 2, making the distances between adjacent movable plates 2 after the unfolding synchronized, so that the movable plates 2 drive the coal ore to unfold evenly for high-pressure water flow impact.

[0104] As an optional embodiment, the conveying component further includes:

[0105] A plurality of groups of rotating grooves 501, wherein a plurality of rotating grooves 501 form a group, and each group of rotating grooves 501 is respectively arranged in a linear array on the top of the movable plate 2;

[0106] A plurality of rotating disks 5 are arranged corresponding to the rotating grooves 501 one by one, and are rotatably installed inside the corresponding rotating grooves 501 respectively;

[0107] A rotating disk 5 is installed inside the rotating trough 501, so that when the upper and lower movable plates 2 clamp and transport the coal ore raw stone, the coal ore raw stone is clamped between the rotating disks 5, so that when the coal ore raw stone is impacted by the high-pressure water flow, it can rotate under the impact of the high-pressure water flow, so that after the coal ore raw stone rotates, the impact range of the high-pressure water flow on the coal ore raw stone can be increased, which is beneficial for the soil and sand and gravel attached to the coal ore raw stone around to be impacted and separated under the action of the impact force, which is beneficial for improving the separation effect between the coal ore raw stone and the soil and sand and gravel.

[0108] As an optional embodiment, the conveying component further includes:

[0109] A plurality of first cylinders 601 are respectively fixed to the bottom of each rotating disk 5;

[0110] A plurality of second cylinders 602 are rotatably mounted inside the respective rotating grooves 501 and are plug-connected with the respective first cylinders 601;

[0111] A plurality of springs 6 are respectively fixed between the first cylinder 601 and the second cylinder 602 which are correspondingly inserted;

[0112] The first cylinder 601 and the second cylinder 602 are plugged into each other, so that when the coal ore raw material is impacted by the high-pressure water flow and drives the rotating disk 5 to rotate, the rotating disk 5 drives the first cylinder 601 to rotate, and the first cylinder 601 drives the second cylinder 602 plugged into it to rotate, so that the first cylinder 601 and the second cylinder 602 can be extended and retracted while rotating, and the elastic force of the spring 6 supports and pushes the second cylinder 602 to move upward, so that the second cylinder 602 can be extended and retracted within a certain range, which is conducive to clamping coal ore raw materials of different sizes, thereby facilitating the increase in the number of coal ore raw materials clamped and positioned, and thereby facilitating the separation of coal and impurities attached to the coal ore raw materials by clamping and impacting them.

[0113] As an optional embodiment, the water separation component includes:

[0114] A water outlet 701 is fixed to the top of one end of the second screening pool 7 facing the first screening pool 1, and the water outlet 701 is connected to an external water source to transport water to the inside of the second screening pool 7;

[0115] The guide plate 702 is fixed to the bottom of one end of the second screening pool 7 facing the first screening pool 1, and is used to guide the raw stones transported by the movable plate 2 to the direction of the second screening pool 7 to the bottom of the second screening pool 7 for buffering;

[0116] The screening plate 8 is fixed to the middle of one end of the second screening tank 7 facing away from the first screening tank 1, and is used to physically separate the coal blocks and impurities separated by water buoyancy into two spaces;

[0117] The water outlet 701 can input a stable water flow into the second screening pool 7, and the guide plate 702 can guide the coal raw stone after the high-pressure impact separation, so that the coal raw stone smoothly enters the second screening pool 7, which is beneficial to avoid the impact force of the coal raw stone entering the second screening pool 7 is too large, resulting in excessive fluctuation of the water flow in the second screening pool 7, thereby affecting the water separation effect. The coal raw stone is separated by water separation in the second screening pool 7, so that the coal floats upward and the impurities settle downward. Then, the floating and settled coal and impurities are separated by the screening plate, so that the coal floating upward can be transported by the subsequent conveyor belt for the next step of drying, and the impurities settled below are also transported and collected for the same treatment. The soil and sand and gravel attached to the coal raw stone after high-pressure flushing are separated, so that when the coal raw stone enters the second screening pool 7 for water separation, the interference of the attached soil and sand and gravel can be reduced, which is beneficial to improve the automatic screening efficiency of coal.

[0118] As an optional embodiment, the water separation component further includes:

[0119] A plurality of third cylinders 9 are fixed to the bottom of the second screening tank 7 and are used to drive the screening plate 8 to move vertically through the telescopic rod;

[0120] The third cylinder 9 can drive the screening plate 8 to move vertically through the telescopic rod, so as to adjust the height of the screening plate 8 according to the water depth inside the second screening pool 7 and the state of the coal, which is conducive to completely separating the coal and impurities.

[0121] As an optional embodiment, the high voltage assembly includes:

[0122] A plurality of high-pressure nozzles 10 are divided into two groups and fixed to opposite sides of two fixed plates 101 to perform high-pressure washing on the raw stones transported by the moving plate 2;

[0123] The box body 11 is fixed between the two fixed plates 101 and is located at the center of the moving track of the moving plate 2;

[0124] The filter plate 1101 is fixed to the middle of the box body 11;

[0125] The drainage box 12 is fixed to one end of the box body 11 facing the second screening pool 7, and a water outlet hole 1201 connected to the second screening pool 7 is formed through the side wall of the drainage box 12;

[0126] The water pump 1202 is fixed to the box body 11 below the filter plate 1101, and the output end of the water pump 1202 is connected to the drainage box 12;

[0127] The high-pressure nozzle 10 can be connected to an external water source to deliver water between the two groups of movable plates 2 at high pressure, so that the coal raw stone is washed by the high-pressure water flow, and the soil and sand and gravel attached to the coal raw stone are separated. The two groups of high-pressure nozzles 10 are staggered with each other, so that when the high-pressure nozzle 10 impacts the coal raw stone, if the coal raw stone can rotate, it will rotate under the impact of the high-pressure water flow, so that the high-pressure water flow impacts the coal raw stone around, which is conducive to improving the separation effect of the coal raw stone and soil sand and gravel impurities;

[0128] After the high-pressure water flow impact is completed, it enters the interior of the box body 11. Under the filtering effect of the filter plate 1101 inside the box body 11, the impurities scattered during the high-pressure water flow impact can be filtered and separated by the filter plate 1101, and the water passes through the filter plate 1101 and enters the interior of the box body 11. Then, under the action of the water pump 1202, the water flow is transported to the drainage box 12, so that the water flow is discharged from the drainage box 12 through the water outlet 1201. On the one hand, after the water flow is discharged, the water flow will not accumulate in the interior of the box body 11, thereby avoiding the accumulation of the water flow, which makes it difficult for the impurities and water flow after the high-pressure impact to enter the interior of the box body 11, but enters the gap between the fixed plate 101 and the first screening pool 1, thereby hindering the movement of the moving plate 2. On the other hand, the discharged water flow can assist the flow of the impurities or coal moving with the moving plate 2, so that the water flow drives the impurities or coal into the interior of the second screening pool 7, which is conducive to avoiding the situation where small-volume impurities or coal move with the moving plate 2 but do not enter the interior of the second screening pool 7.

[0129] As an optional embodiment, the high voltage component further includes:

[0130] Two negative pressure boxes 13 are symmetrically fixed on both sides of the top of the drainage box 12;

[0131] Two negative pressure pumps 1301 are fixed on both sides of the drainage box 12, and the input ends of the two negative pressure pumps 1301 are fixed with connecting pipes 1302, and the two connecting pipes 1302 are connected to the two negative pressure boxes 13 respectively;

[0132] Two filter sheets are respectively fixed to the ends of the two connecting pipes 1302 facing the negative pressure box 13;

[0133] The negative pressure pump 1301 can be connected to the negative pressure box 13 through the connecting pipe 1302, so that negative pressure is generated inside the negative pressure box 13. Under the action of negative pressure, impurities and water that may flow along the end edge of the movable plate 2 into the gap of the fixed plate 101 are promoted to enter the interior of the negative pressure box 13. Then, under the action of the filter plate, the water flow is discharged through the filter plate 1101 into the box body 11, and the impurities are filtered and separated, thereby preventing the impurities from entering the gap of the fixed plate 101 and obstructing the movable plate 2.

[0134] The working principle of the present invention is as follows: the mined raw coal is transported to the first screening pool 1 through a conveyor belt, so that the raw coal is transported to the inside of the conveying component. After the raw coal enters the inside of the conveying component, the conveying component clamps the raw coal, so that the raw coal is clamped and positioned up and down during the transportation process. By controlling the density of the raw coal, the raw coal is in a loose state when it is transported to the inside of the conveying component. With the transportation of the conveying component, the clamped raw coal is further pulled and spread, so that gaps are left between the raw coal.

[0135] During the process of the raw coal being clamped and conveyed inside the conveying component, the high-pressure component conveys high-pressure water flow to the raw coal, so that the high-pressure water flow impacts the raw coal being clamped and conveyed, so that the soil and sand and gravel attached to the raw coal are impacted and separated under the impact force of the high-pressure water flow, which is conducive to separating the soil and sand and gravel attached to the raw coal before the raw coal enters the water separation component for water separation, thereby helping to avoid the situation where impurities enter the coal or part of the coal is sorted into the impurities during water separation;

[0136] The water separation component can sort the coal and impurities after impact separation, making the coal float up and the impurities sink, thereby realizing automatic screening of the coal.

[0137] 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, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. An automatic screening device for coal mining, comprising a first screening pool (1) and a second screening pool (7), wherein the second screening pool (7) is connected to the first screening pool (1), characterized in that: Also includes: Two fixing plates (101) are symmetrically fixed inside the first screening tank (1) to isolate an installation space inside the first screening tank (1); A conveying assembly is installed between the two fixing plates (101) and is used to clamp the raw stone during the process of conveying the raw stone; The high-pressure component is used to perform high-pressure washing on the raw stone held and conveyed by the conveying component, so as to separate the coal blocks from the soil and sand in the raw stone by the high-pressure water flow; A water separation component is installed in the second screening tank (7) and is used to transport the coal blocks and soil and gravel separated by the first screening tank (1) in layers under the action of buoyancy.

2. The automatic screening equipment used in coal mining according to claim 1, characterized in that: The conveying assembly comprises: Two groups of movable plates (2), a plurality of movable plates (2) form one group, and the two groups of movable plates (2) are symmetrically slidably installed in the inner part of the waist-shaped sliding groove opened on the fixed plate (101) in an up-and-down manner; A plurality of telescopic frames (203), wherein the telescopic frames (203) are respectively installed between adjacent movable plates (2) via sliders (202), so that the adjacent movable plates (2) are extended or retracted by the telescopic frames (203); Two driving components are symmetrically mounted on the two ends of the lower group of movable plates (2), and are used to drive the lower group of movable plates (2) to extend through the telescopic frame (203) when sliding to the upper horizontal position, so as to drive the clamped raw stones to disperse.

3. The automatic screening equipment used in coal mining according to claim 2 is characterized in that: The drive assembly comprises: A motor (304) fixed on the outer wall of the first screening tank (1); Two synchronous wheels (303) are both rotatably installed inside the installation space, and the motor (304) drives one of the synchronous wheels (303) to rotate via an output shaft; A synchronous belt (302) is installed on the outer rings of the two synchronous wheels (303); A plurality of first limit blocks (3) are fixed on the outer wall of the synchronous belt (302) in a linear array along the track of the synchronous belt (302); A plurality of through slots (301) are respectively provided inside the sliding rods (204) fixed at the ends of the respective movable plates (2), and the first limiting blocks (3) are adapted to the through slots (301).

4. The automatic screening equipment for coal mining according to claim 3 is characterized in that: The drive assembly also includes: A second limit block (4) is vertically slidably mounted on a side wall of the fixing plate (101) located on one side of the installation space; A first cylinder (401) is fixed inside the installation space and drives the second limit block (4) to move vertically via a telescopic rod; A third limiting block (402) is vertically slidably mounted on a side wall of the fixing plate (101) located on one side of the installation space; The second cylinder (403) is fixed inside the installation space and drives the third limit block (402) to move vertically through the telescopic rod. When the second limit block (4) and the third limit block (402) move vertically alternately, the movable plate (2) is limited, so that the movable plate (2) is unfolded in turn by stretching the telescopic frame (203).

5. The automatic screening equipment for coal mining according to claim 2, characterized in that: The conveying assembly also includes: A plurality of groups of rotating grooves (501), wherein a plurality of the rotating grooves (501) form a group, and each group of the rotating grooves (501) is respectively arranged in a linear array on the top of the movable plate (2); A plurality of rotating disks (5) are arranged in one-to-one correspondence with the rotating grooves (501) and are rotatably mounted inside the corresponding rotating grooves (501).

6. The automatic screening equipment used in coal mining according to claim 5, characterized in that: The conveying assembly also includes: A plurality of first cylinders (601) are respectively fixed to the bottom of each of the rotating disks (5); A plurality of second cylinders (602) are rotatably mounted inside each of the rotating grooves (501) and are plug-connected to each of the first cylinders (601); A plurality of springs (6) are respectively fixed between the first cylinder (601) and the second cylinder (602) which are correspondingly inserted.

7. The automatic screening equipment used in coal mining according to claim 2, characterized in that: The water separation component comprises: A water outlet head (701) is fixed to the top of one end of the second screening pool (7) facing the first screening pool (1), and the water outlet head (701) is connected to an external water source to transport water to the interior of the second screening pool (7); A guide plate (702) is fixed to the bottom of one end of the second screening pool (7) facing the first screening pool (1), and is used to guide the raw stones transported by the movable plate (2) to the direction of the second screening pool (7) to the bottom of the second screening pool (7) for buffering; The screening plate (8) is fixed to the middle of one end of the second screening tank (7) facing away from the first screening tank (1), and is used to physically separate the coal blocks and impurities separated by water buoyancy into two spaces.

8. The automatic screening equipment for coal mining according to claim 7, characterized in that: The water separation component also includes: A plurality of third cylinders (9) are fixed to the bottom of the second screening tank (7) and are used to jointly drive the screening plate (8) to move vertically via telescopic rods.

9. The automatic screening equipment for coal mining according to claim 2, characterized in that: The high voltage assembly comprises: A plurality of high-pressure spray heads (10) are divided into two groups and fixed to opposite sides of the two fixed plates (101) respectively, so as to perform high-pressure washing on the raw stones transported by the movable plate (2); The box body (11) is fixed between the two fixed plates (101) and is located at the center of the moving track of the moving plate (2); A filter plate (1101) is fixed to the middle of the box (11); A drainage box (12) is fixed to one end of the box body (11) facing the second screening pool (7), and a water outlet hole (1201) communicating with the second screening pool (7) is provided through the side wall of the drainage box (12); A water pump (1202) is fixed to the box body (11) at a position below the filter plate (1101), and an output end of the water pump (1202) is connected to the drainage box (12).

10. The automatic screening equipment used in coal mining according to claim 9, characterized in that: The high voltage assembly also includes: Two negative pressure boxes (13) are symmetrically fixed on both sides of the top of the drainage box (12); Two negative pressure pumps (1301) are respectively fixed on two sides of the drainage box (12); the input ends of the two negative pressure pumps (1301) are respectively fixed with connecting pipes (1302); the two connecting pipes (1302) are respectively connected to the two negative pressure boxes (13); The two filter sheets are respectively fixed to one end of the two connecting pipes (1302) facing the negative pressure box (13).

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