A jig washer for coal washing and its usage method

Abstract

The present invention relates to the technical field of coal washing, in particular to a jig washer for coal washing and its usage method, which includes a main frame body. The interior of the main frame body is divided into a second screening chamber and a first screening chamber by a partition frame. At the front end of the first screening chamber, there is a feed inlet for feeding and a water inlet pipe for supplying water, and at the rear end of the second screening chamber, there is an end discharge port for discharging clean coal. The jig washer for coal washing proposed by the present invention can stratify coal mines by using the front liquid pushing plate, enhance the fluidity of coal, coal gangue and coal mines by using the rear liquid pushing plate, and can also actively discharge coal gangue and medium coal by using the discharge shaft, thereby effectively avoiding blockage and reducing the water consumption during the discharging and washing processes. Thus, it solves the problems of large water consumption, easy blockage and easy reduction of washing efficiency in the existing jig washer, and can effectively improve the working reliability and water-saving ability of the jig washer.

Description

Technical Field

[0001] The present invention relates to the technical field of coal washing, and specifically relates to a jig washer for coal washing and its usage method. Background Art

[0002] Since coal mines are mixtures, including substances such as coal, coal gangue, and sediment, coal mines need to be screened after mining. Among them, using a jig to wash coal mines is the most commonly used method in the coal industry.

[0003] The jig washes coal mines by making the coal mines flow in a vertically ascending and descending medium, so as to wash and separate the coal mines according to density differences, so as to wash and discharge slag such as coal gangue and sediment in the coal mines, and separate medium coal and clean coal. However, when the existing jig is in use, in order to effectively separate slag such as coal, coal gangue, and sediment, a large amount of water is required for flushing. Especially when discharging slag, coal gangue, and medium coal, the water flow rate needs to be maintained to avoid blockage of the internal equipment by minerals and slag. This requires a large amount of water, thus bringing huge pressure on wastewater treatment to enterprises. If the water flow rate is reduced, it is difficult to achieve good washing and separation effects. Moreover, when the slag content in the coal mine is relatively high, simply increasing the water flow rate is still difficult to avoid slag precipitation inside the equipment, especially at the mesh holes of the sieve and the feeding port. Therefore, the equipment needs to be frequently cleaned, and the screening efficiency during normal use of the equipment is affected.

[0004] Therefore, we need a jig washer for coal washing and its usage method to solve the problems of large water consumption, easy blockage, and easy reduction of washing and separation efficiency of the existing jig, and can effectively improve the working reliability and water-saving ability of the jig. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems of large water consumption, easy blockage, and easy reduction of washing and separation efficiency of the existing jig. The present application provides a jig washer for coal washing and its usage method, which can effectively improve the working reliability and water-saving ability of the jig.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A jig washer for coal washing, comprising:

[0007] A main frame body, the interior of the main frame body is divided into a second screening chamber and a first screening chamber by a partition frame. The front end of the first screening chamber is provided with a feed inlet for feeding and a water inlet pipe for supplying water, and the rear end of the second screening chamber is provided with a final discharge port for discharging clean coal. A first sieve is arranged in the first screening chamber, and a second sieve is arranged in the second screening chamber;

[0008] Bottom housing. A bottom housing for discharging slag is provided at the bottom of the main frame corresponding to both the first screening chamber and the second screening chamber. An installation housing is fixedly installed inside the bottom housing. A front-end liquid pushing plate corresponding to the front end of the first screening chamber or the front end of the second screening chamber is fixedly installed inside the installation housing. The front-end liquid pushing plate is used to stratify the coal in the first screening chamber or the second screening chamber by vertically pushing the water flow. A rear-end liquid pushing plate corresponding to the rear end of the first screening chamber or the rear end of the second screening chamber is fixedly installed inside the installation housing. The rear-end liquid pushing plate is used to make the washed coal or coal gangue floating above the first screen and the second screen by vertically pushing the water flow. A power device for driving the vertical movement of the front-end liquid pushing plate and the rear-end liquid pushing plate is provided inside the bottom housing.

[0009] Preferably, a top cover for sealing the main frame is fixedly installed at the top of the main frame. The top cover is used to prevent the water or coal in the first screening chamber and the second screening chamber from splashing out. A handle for conveniently opening the top cover is fixedly installed on the top cover. A transparent observation window for conveniently observing the working conditions inside the first screening chamber and the second screening chamber is fixedly installed on the top cover. Discharge channels for discharging the washed coal or coal gangue are provided at the rear ends of the main frame corresponding to the first screen and the second screen. A discharge shaft for discharging the washed coal or coal gangue by squeezing the washed coal or coal gangue during rotation is rotatably installed inside the discharge channel. A discharge motor for driving the discharge shaft is fixedly installed on the main frame. A controller electrically connected to the power device and the discharge motor is fixedly installed on the main frame.

[0010] Preferably, guide rails are fixedly installed on the top cover along the front-rear direction. A coal pushing device for pushing the coal is provided on the guide rails. The coal pushing device includes a moving seat slidably installed on the guide rails. An auxiliary motor electrically connected to the controller is fixedly installed on the moving seat. A driving wheel is driven by the output end of the auxiliary motor. A rack meshing with the driving wheel is provided on the guide rails. A connecting arm is provided below the moving seat. A triangular coal pushing plate for scraping the upper surface of the first screen or the upper surface of the second screen is provided below the connecting arm. A vertical coal pushing end for pushing the coal gangue or the washed coal on the first screen or the second screen into the discharge channel is provided at the triangular coal pushing plate in the direction towards the rear end of the main frame. An inclined end for shoveling the coal gangue or the washed coal on the first screen or the second screen is provided at the triangular coal pushing plate in the direction towards the front end of the main frame.

[0011] Preferably, the discharge shaft includes a central shaft body fixedly installed at the output end of the discharge motor. At least four support plates are arranged in a circumferential array on the central shaft body. A material groove for accommodating the washed coal or coal gangue is formed between the support plates. Rubber sleeves are wrapped on both the support plates and the central shaft body. The outer wall surface of the rubber sleeve is in sealing fit with the inner wall surface of the discharge channel.

[0012] Preferably, both the rear liquid pushing plate and the front liquid pushing plate are sealed with the installation housing through an isolation rubber membrane, and the installation housing and the bottom housing are fixedly installed through bolts.

[0013] Preferably, independent power devices are respectively used in the installation housing to drive the rear liquid pushing plate and the front liquid pushing plate to move. The power device includes a top sliding rod fixedly installed with the rear liquid pushing plate or the front liquid pushing plate. The top sliding rod is slidably installed in a bottom sleeve. The bottom of the bottom sleeve is fixedly installed on a bottom connecting plate. A first return spring for driving the top sliding rod to slide downward is installed between the bottom connecting plate and the top sliding rod. The bottom connecting plate is fixedly installed with the installation housing, and a first driving motor is fixedly installed on the bottom connecting plate. The output end of the first driving motor drives the top sliding rod to move upward through a first cam.

[0014] Preferably, a bottom cavity is formed between the bottom of the installation housing and the bottom of the bottom housing, and a bottom flow channel for communicating the bottom of the first screening cavity or the bottom of the second screening cavity with the bottom cavity is formed between the side surface of the installation housing and the side surface of the bottom housing. A vibration device for vibrating the water flow in the bottom cavity is arranged in the bottom cavity. The vibration device includes an upper housing installed at the bottom of the installation housing. The bottom of the upper housing is fixedly installed with a lower housing through a central guiding column. A sliding sleeve is slidably installed on the central guiding column. An annular frame for pushing the water flow is fixedly installed on the outer side of the sliding sleeve. A sealing rubber membrane for isolating the water flow is fixedly installed between the outer side of the upper housing and the outer side of the lower housing. The sealing rubber membrane is fixedly installed with the outside of the annular frame. A second driving motor is fixedly installed on the lower housing. The output end of the second driving motor drives the sliding sleeve to move upward along the central guiding column through a second cam. A second return spring for driving the sliding sleeve to reset downward is fixedly installed between the sliding sleeve and the lower housing.

[0015] Preferably, a material storage device for collecting slag is arranged at the bottom of the bottom housing. The material storage device includes a storage tank fixedly installed with the bottom housing. A storage cavity communicated with the bottom cavity and used for storing slag is arranged inside the storage tank. A closing device for closing the storage cavity is fixedly installed at the bottom of the bottom housing. The closing device includes a push rod fixedly installed with the bottom housing. The output end of the push rod drives a push frame to move up and down. A steering motor is fixedly installed on the push frame. The output end of the steering motor drives a worm. The output end of the push frame drives a bottom cover for closing the bottom of the storage cavity. A worm gear meshing with the worm is fixedly installed on the rotating shaft of the bottom cover. A closing plug for preventing the bottom cover from rotating and inserted into the storage cavity is fixedly installed at the top of the bottom cover.

[0016] Preferably, an annular flow channel is formed at the bottom of the bottom cavity, and the annular flow channel is communicated with the material storage cavity through at least one blanking pipe. A rotary motor electrically connected to the controller is fixedly installed at the center of the bottom shell corresponding to the annular flow channel, and the rotary motor is used to drive a pressing device located in the annular flow channel to rotate. The pressing device includes a central plate fixedly installed coaxially with the output shaft of the rotary motor, and a pushing and scraping blade for closing the upper end of the blanking pipe and scraping the inner wall of the bottom cavity is fixedly installed on the central plate. An arc-shaped pressing end for pressing the slag into the blanking pipe is integrally formed on one side of the pushing and scraping blade, and an arc-shaped feeding end for guiding the slag into the lower part of the arc-shaped pressing end is integrally formed on the other end of the pushing and scraping blade.

[0017] A use method of a jig washer for coal washing and dressing includes the following steps:

[0018] Step 1: During use, first inject water flow into the first screening cavity and the second screening cavity through the water inlet pipe. At this time, the water flow will fill the corresponding inner part of the bottom shell and flow out through the end discharge port. Subsequently, inject coal mine raw materials into the first screening cavity through the feed port. At this time, the coal mine raw materials will gradually move from the front end of the main frame to the rear end of the main frame under the push of the water flow.

[0019] Step 2: Subsequently, the operator drives the rear liquid pushing plate and the front liquid pushing plate to perform periodic up and down movements by controlling the power device. The rear liquid pushing plate and the front liquid pushing plate will push the water flow located above them and drive the coal mine in the water flow to vibrate up and down. During the vibration process, the slag with a smaller particle size that can pass through the first screen and the second screen will move downward to the inside of the bottom shell and finally be discharged from the bottom of the bottom shell. The coal mine raw materials in the first screening cavity will be gradually stratified into a mixed coal layer located in the upper layer and a coal gangue layer located in the lower layer under the push of the corresponding front liquid pushing plate. Subsequently, the mixed coal layer will cross the isolation frame under the push of the water flow and enter the second screening cavity, while the coal gangue layer will be in a suspended state under the push of the corresponding rear liquid pushing plate and thus be more easily pushed by the water flow into the corresponding discharge flow channel. The mixed coal layer entering the second screening cavity will be gradually stratified into a clean coal layer located in the upper layer and a medium coal layer located in the lower layer under the push of the corresponding front liquid pushing plate. Among them, the clean coal layer will be discharged from the end discharge port under the push of the water flow, while the medium coal layer will be in a suspended state under the push of the rear liquid pushing plate and be more easily pushed into the corresponding discharge flow channel under the push of the water flow.

[0020] Step 3: When the coal gangue layer accumulates to a specified height in the first screening cavity, the operator discharges the coal gangue in the coal gangue layer. When the medium coal layer accumulates to a specified height in the second screening cavity, the operator discharges the medium coal in the medium coal layer.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] A jig washer for coal washing proposed by the present invention and its usage method can stratify coal mines by using a front-end liquid pushing plate, enhance the fluidity of coal, coal gangue, and coal mines by using a rear-end liquid pushing plate, and can also actively discharge coal gangue and medium coal by using a discharge shaft, thereby effectively avoiding blockage and reducing water consumption during the discharging and washing processes. Then, intermittent discharging of slag is achieved through a vibration device, a material pressing device, a sealing device, and a discharging device, and it is also possible to avoid slag accumulation in the bottom cavity, so manual discharging or regular maintenance is not required. Thus, the problems of large water consumption, easy blockage, and easy reduction of washing efficiency of the existing jig washer are solved, and the working reliability and water-saving ability of the jig washer can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the present invention;

[0024] Figure 2 It is a side view of the structure of the present invention;

[0025] Figure 3 It is a sectional view of the internal structure of the main frame body of the present invention;

[0026] Figure 4 It is a sectional view of the internal structure of the bottom shell of the present invention;

[0027] Figure 5 It is a schematic structural diagram of the internal structure of the vibration device of the present invention;

[0028] Figure 6 It is a schematic structural diagram of the sealing device of the present invention;

[0029] Figure 7 It is a schematic structural diagram of the power device of the present invention;

[0030] Figure 8 It is a schematic structural diagram of the material pushing device of the present invention;

[0031] Figure 9 It is a schematic structural diagram of the discharge shaft of the present invention;

[0032] Figure 10 It is a schematic structural diagram of the material pressing device of the present invention.

[0033] In the figure: 1, main frame body; 2, closing device; 201, closing plug; 202, bottom cover; 203, push rod; 204, push frame; 205, worm gear; 206, worm; 207, direction-adjusting motor; 3, discharge shaft; 301, material chute; 302, support plate; 303, central shaft body; 304, rubber sleeve; 4, pressing device; 401, pushing scraper; 402, central plate; 403, arc-shaped pressing end; 404, arc-shaped feeding end; 5, power device; 501, top slide bar; 502, first driving motor; 503, first cam; 504, bottom sleeve; 505, first return spring; 506, bottom connecting plate; 6, pushing device; 601, auxiliary motor; 602, moving seat; 603, driving wheel; 604, connecting arm; 605, vertical pushing end; 606, triangular pushing plate; 607, inclined end; 7, vibrating device; 701, second return spring; 702, central guiding column; 703, sliding sleeve; 704, upper housing; 705, second cam; 706, annular frame; 707, second driving motor; 708, sealing rubber membrane; 709, lower housing; 8, storage device; 801, blanking pipe; 802, storage tank; 803, storage cavity; 9, controller; 10, installation housing; 11, bottom flow channel; 12, bottom cavity; 13, rotating motor; 14, rear-end liquid pushing plate; 15, front-end liquid pushing plate; 16, first screen; 17, water inlet pipe; 18, feeding port; 19, first screening cavity; 20, guide rail; 21, transparent observation window; 22, second screening cavity; 23, handle; 24, top cover; 25, end discharge port; 26, discharge motor; 27, discharge flow channel; 28, second screen; 29, isolation frame; 30, bottom housing. Detailed implementation mode

[0034] In order to clearly and completely describe the purpose and technical solution of the present invention, and to more clearly explain its advantages, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are some embodiments of the present invention, rather than all embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0035] Embodiment 1: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 9, the present invention provides a jig washer for coal washing, comprising a main frame body 1, a bottom housing 30 and a discharge shaft 3. The interior of the main frame body 1 is divided into a second screening chamber 22 and a first screening chamber 19 by a partition frame 29. An inlet 18 for feeding and a water inlet pipe 17 for supplying water are provided at the front end of the first screening chamber 19, and an end discharge port 25 for discharging clean coal is provided at the rear end of the second screening chamber 22. A first screen 16 is arranged in the first screening chamber 19, and a second screen 28 is arranged in the second screening chamber 22. The water inlet pipe 17 is used to provide washing water. The water flow provided by the water inlet pipe 17 will flow from the first screening chamber 19 to the second screening chamber 22 and then be discharged from the end discharge port 25. The inlet 18 is used to continuously supply coal mine raw materials into the first screening chamber 19. The coal mine raw materials entering the first screening chamber 19 will also enter the second screening chamber 22 under the push of the water flow, and the washing of the coal mine will be realized during the movement of the coal mine. And during the movement of the coal mine raw materials, the finer-grained ore particles and slag components such as sediment inside the coal mine raw materials can pass through the first screen 16 or the second screen 28, and thus be screened out.

[0036] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4, a bottom housing 30 for discharging slag is provided at the bottom of the main frame body 1 corresponding to the first screening chamber 19 and the second screening chamber 22. The bottom housing 30 is used to collect the slag screened out by the first screen 16 and the second screen 28, and the slag will converge in the bottom housing 30 and be cleaned during subsequent maintenance. An installation housing 10 is fixedly installed in the bottom housing 30. A front liquid pushing plate 15 corresponding to the front end of the first screening chamber 19 or the front end of the second screening chamber 22 is fixedly installed in the installation housing 10, and the front liquid pushing plate 15 is used to stratify the coal in the first screening chamber 19 or the second screening chamber 22 by vertically pushing the water flow. A rear liquid pushing plate 14 corresponding to the rear end of the first screening chamber 19 or the rear end of the second screening chamber 22 is fixedly installed in the installation housing 10, and the rear liquid pushing plate 14 is used to make the medium coal or coal gangue floating above the first screen 16 and the second screen 28 by vertically pushing the water flow. Both the rear liquid pushing plate 14 and the front liquid pushing plate 15 are sealed with the installation housing 10 through an isolation rubber membrane, and the installation housing 10 and the bottom housing 30 are fixedly installed through bolts. The functions of the front liquid pushing plate 15 and the rear liquid pushing plate 14 are different. The front liquid pushing plate 15 can provide a stronger upward movement force for the flow, so as to achieve stratification by using the different densities and particle sizes of the components such as sediment, coal, and coal gangue contained in the coal mine raw materials. The front liquid pushing plate 15 located in the first screening chamber 19 is used to separate the coal mine raw materials into a mixed coal seam located in the upper layer and coal gangue located in the lower layer. The mixed coal seam will be continuously sent into the second screening chamber 22 by water power, and the coal gangue will gradually converge near the isolation frame 29 under the push of the water flow and the block of the isolation frame 29. The front liquid pushing plate 15 located in the second screening chamber 22 is used to separate the mixed coal seam entering the second screening chamber 22 into clean coal located in the upper layer and medium coal located in the lower layer. The clean coal will be discharged from the end discharge port 25 under the drive of the water flow, and the medium coal will be sent to a position below the end discharge port 25 for convergence under the push of the water flow.The rear liquid pushing plate 14 forms vibrations with a smaller force and a higher frequency than those of the front liquid pushing plate 15, so that the gangue directly contacting the first screen 16 or the medium coal directly contacting the second screen 28 can always be in a suspended state under the water flow oscillation pushed by the rear liquid pushing plate 14, and will not accumulate on the first screen 16 or the second screen 28 under the action of gravity all the time. Moreover, since the vibration force is small enough not to remix the materials in the upper layer and the materials in the lower layer, the stratified deposit structure formed by the pushing of the front liquid pushing plate 15 is not damaged. In this way, it can effectively avoid the re - mixing of minerals, which affects the separation effect. However, after the minerals in the lower layer can also be suspended through this oscillation, the friction force received by the minerals in the lower layer can be effectively reduced, thus facilitating the movement of the minerals in the lower layer being pushed by the water flow from the front end to the rear end of the main frame body 1. In this way, it can also effectively prevent the lower deposit from affecting the slag passing through the first screen 16 or the second screen 28, so as to obtain a better screening effect. And since the water flow only needs a lower flow rate to push the minerals forward, the water consumption can be effectively saved during the whole screening process. Moreover, the front liquid pushing plate 15 and the rear liquid pushing plate 14 are directly installed at the bottom of the first screen 16 or the second screen 28, and the height from the liquid surface is shorter, so less water flow needs to be pushed, which can reduce the required power and save energy consumption.

[0037] Please refer to Figure 4 and Figure 7, within the installation housing 10, independent power devices 5 are respectively used to drive the rear liquid pushing plate 14 and the front liquid pushing plate 15 to move. That is to say, each rear liquid pushing plate 14 is driven by an independent power device 5, and each front liquid pushing plate 15 is also driven by an independent power device 5. In this way, the vibration mode of the corresponding front liquid pushing plate 15 or rear liquid pushing plate 14 can be independently adjusted through the corresponding power device 5, so as to adapt to the washing work of coal mine raw materials with different components. The power device 5 includes a top slide bar 501 fixedly installed with the rear liquid pushing plate 14 or the front liquid pushing plate 15, and the top slide bar 501 is slidably installed in the bottom sleeve 504. The bottom of the bottom sleeve 504 is fixedly installed on the bottom connecting plate 506, and a first return spring 505 for driving the top slide bar 501 to slide downward is installed between the bottom connecting plate 506 and the top slide bar 501. The bottom connecting plate 506 is fixedly installed with the installation housing 10, and a first driving motor 502 is fixedly installed on the bottom connecting plate 506. The output end of the first driving motor 502 drives the top slide bar 501 to move upward through the first cam 503, and the first driving motor 502 is electrically connected to the controller 9. When the first driving motor 502 rotates, the first cam 503 will be driven to rotate together by the first driving motor 502. Therefore, the protruding area of the first cam 503 can be used to push the top slide bar 501 upward. When the protruding part of the first cam 503 turns to the lower side, the top slide bar 501 will be pulled downward by the first return spring 505, thus repeating this process to realize the up and down movement of the top slide bar 501. When the top slide bar 501 moves up and down, it will also drive the front liquid pushing plate 15 or the rear liquid pushing plate 14 located on it to move up and down, thereby driving the corresponding water flow to move up and down. In this way, the purpose of using the water flow to lift the coal mine and achieve stratification can be realized. Since the power device 5 is built into the installation housing 10, and the installation housing 10 is arranged inside the bottom housing 30 and is wrapped by water flow, the heat dissipated during the operation of the power device 5 can be absorbed by the water flow. Therefore, it also has a better heat dissipation effect. At the same time, the noise and vibration generated during the operation of the power device 5 can also be buffered and absorbed by the water flow. Therefore, the overall working noise of the equipment is smaller.

[0038] Please refer to Figure 1 , Figure 3 and Figure 9The main frame 1 is provided with a discharge channel 27 for discharging medium coal or coal gangue at the rear ends corresponding to the first screen 16 and the second screen 28, and a discharge shaft 3 is rotatably installed in the discharge channel 27 for discharging the medium coal or coal gangue by squeezing the medium coal or coal gangue during rotation. A discharge motor 26 for driving the discharge shaft 3 is fixedly installed on the main frame 1, and a controller 9 electrically connected to the power device 5 and the discharge motor 26 respectively is fixedly installed on the main frame 1. The discharge shaft 3 includes a central axis body 303 fixedly installed on the output end of the discharge motor 26, and at least four support plates 302 are arranged in a circular array on the central axis body 303, and a material trough 301 for accommodating medium coal or coal gangue is formed between the support plates 302, and the support plates 302 and the central axis body 303 are both wrapped with rubber sleeves 304, and the outer wall surface of the rubber sleeve 304 is sealed with the inner wall surface of the discharge channel 27. The discharge motor 26 is used to drive the discharge shaft 3 to rotate slowly. When the coal gangue or medium coal approaches the discharge shaft 3, it will be sent into the material trough 301 under the push of the water flow, and the water originally in the material trough 301 will be gradually squeezed and returned to the first screening chamber 19 or the second screening chamber 22. Then, the coal gangue or medium coal in the material trough 301 will be gradually transported to the outlet below the discharge channel 27 under the rotation of the rubber sleeve 304 and discharged. Since the rubber sleeve 304 fits the inner wall of the discharge channel 27, the water flow cannot directly pass over the discharge shaft 3 and be discharged. Moreover, since the material trough 301 can be filled with coal gangue or medium coal, only a small amount of water can be discharged each time the material is discharged, which can effectively avoid the loss of water flow and save water. Since the support plate 302 and the central axis 303 are both covered by the rubber sleeve 304, and the rubber sleeve 304 itself can be deformed after being subjected to force, the medium coal or coal gangue entering the material trough 301 can obtain sufficient accommodation space by squeezing the rubber sleeve 304 after being subjected to force, thereby preventing the medium coal or coal gangue from being directly stuck between the support plate 302 and the discharge channel 27, causing the discharge shaft 3 to be unable to rotate, or squeezing and deforming the discharge shaft 3, causing a large amount of water in the first screening chamber 19 or the second screening chamber 22 to be lost, thereby having higher working reliability and maintainability.

[0039] When the jig washer designed in this embodiment is in use, first, water flow is injected into the first screening chamber 19 and the second screening chamber 22 through the water inlet pipe 17. At this time, the water flow will fill the corresponding bottom housing 30 and flow out through the end discharge port 25. Subsequently, the coal mine raw materials are injected into the first screening chamber 19 through the feed inlet 18. At this time, the coal mine raw materials will gradually move from the front end of the main frame body 1 to the rear end of the main frame body 1 under the push of the water flow. Subsequently, the operator issues a beneficiation instruction through the controller 9. At this time, the controller 9 will control the power device 5 to drive the rear liquid pushing plate 14 and the front liquid pushing plate 15 to perform periodic up and down movements. The rear liquid pushing plate 14 and the front liquid pushing plate 15 will push the water flow above them and drive the coal mine in the water flow to vibrate up and down. During the vibration process, the slag with a smaller particle size that can pass through the first screen 16 and the second screen 28 will move downward into the interior of the bottom housing 30 and finally be discharged from the bottom of the bottom housing 30. The coal mine raw materials in the first screening chamber 19 will be gradually stratified into a mixed coal layer located in the upper layer and a coal gangue layer located in the lower layer under the push of the corresponding front liquid pushing plate 15. Subsequently, the mixed coal layer will cross the isolation frame 29 under the push of the water flow and enter the second screening chamber 22, while the coal gangue layer will be in a suspended state under the push of the corresponding rear liquid pushing plate 14, making it easier to be pushed by the water flow into the corresponding discharge channel 27. The mixed coal layer entering the second screening chamber 22 will be gradually stratified into a clean coal layer located in the upper layer and a medium coal layer located in the lower layer under the push of the corresponding front liquid pushing plate 15. Among them, the clean coal layer will be discharged from the end discharge port 25 under the push of the water flow, while the medium coal layer will be in a suspended state under the push of the rear liquid pushing plate 14 and will be more easily pushed into the corresponding discharge channel 27 under the push of the water flow. When the coal gangue layer accumulates to a specified height in the first screening chamber 19, the operator turns on the corresponding discharge motor 26, and uses the discharge motor 26 to drive the discharge shaft 3 corresponding to the first screening chamber 19 to discharge the coal gangue from the corresponding discharge channel 27. When the medium coal layer accumulates to a specified height in the second screening chamber 22, the operator turns on the corresponding discharge motor 26 and drives the discharge shaft 3 corresponding to the second screening chamber 22 to discharge the medium coal from the corresponding discharge channel 27. Thus, the problems of large water consumption, easy blockage, and easy reduction of washing efficiency of the existing jig washer are solved, and the working reliability and water-saving ability of the jig washer can be effectively improved.

[0040] Embodiment 2: Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 8, on the basis of the first embodiment, a top cover 24 for sealing the top of the main frame body 1 is fixedly installed at the top of the main frame body 1. The top cover 24 is used to prevent water or coal in the first screening chamber 19 and the second screening chamber 22 from splashing out. A handle 23 for conveniently opening the top cover 24 is fixedly installed on the top cover 24, and a transparent observation window 21 for conveniently observing the working conditions in the first screening chamber 19 and the second screening chamber 22 is fixedly installed on the top cover 24. A guide rail 20 is fixedly installed on the top cover 24 along the front-back direction, and a material pushing device 6 for pushing coal to move is arranged on the guide rail 20. The material pushing device 6 includes a moving seat 602 slidably installed on the guide rail 20, and an auxiliary motor 601 electrically connected to the controller 9 is fixedly installed on the moving seat 602. A driving wheel 603 is driven at the output end of the auxiliary motor 601. A rack meshing with the driving wheel 603 is arranged on the guide rail 20. A connecting arm 604 is arranged below the moving seat 602, and a triangular material pushing plate 606 for scraping the upper surface of the first screen 16 or the second screen 28 is arranged below the connecting arm 604. A vertical material pushing end 605 for pushing gangue or medium coal on the first screen 16 or the second screen 28 into the discharge channel 27 is arranged at the triangular material pushing plate 606 in the direction towards the rear end of the main frame body 1, and an inclined end 607 for shoveling gangue or medium coal on the first screen 16 or the second screen 28 is arranged at the triangular material pushing plate 606 in the direction towards the front end of the main frame body 1. The triangular material pushing plate 606 can move back and forth along the guide rail 20 driven by the auxiliary motor 601, so as to scrape the upper ends of the first screen 16 or the second screen 28, which can effectively avoid slag adhering to the first screen 16 or the second screen 28 and blocking the first screen 16 and the second screen 28. At the same time, the connecting arm 604 itself can also scrape the inner walls of the first screening chamber 19 or the second screening chamber 22, so as to ensure that slag cannot accumulate and agglomerate inside the main frame body 1, and avoid the problem of reduced screening efficiency caused by blockage.When the triangular pusher plate 606 moves from the front end of the main frame body 1 to the rear end of the main frame body 1, since the vertical pusher end 605 has a height of at least two centimeters, the vertical pusher end 605 can be used to directly push the gangue or medium coal located in the lower layer towards the discharge flow channel 27, thereby assisting the gangue or medium coal to be discharged by the discharge shaft 3. When the triangular pusher plate 606 moves from the rear end of the main frame body 1 to the front end of the main frame body 1, since the medium coal or gangue can float up a certain distance under the push of the front liquid pusher plate 15 and the rear liquid pusher plate 14, the inclined end 607 can be inserted under the medium coal or gangue and can thus pass through normally. Moreover, the horizontal movement exerted by the inclined end 607 on the medium coal or gangue will also be offset by the flow of water. Therefore, the layered structure of the coal deposit can be not damaged. In this way, on the premise of ensuring the normal layered separation of the coal mine, the discharge of the medium coal and gangue can be assisted, avoiding the need for manual cleaning when the medium coal and gangue cannot be discharged normally. At the same time, it also avoids the accumulation of impurities such as slag mixed in the medium coal and gangue above the first screen 16 or the second screen 28, which affects the normal washing work, thereby improving the use reliability and washing efficiency of the equipment. Further, the problems of large water consumption, easy blockage, and easy reduction of washing efficiency in the existing jigs are solved, and the working reliability and water-saving ability of the jig can be effectively improved.

[0041] Embodiment 3: Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5, on the basis of the second embodiment, a bottom cavity 12 is formed between the bottom of the installation housing 10 and the bottom of the bottom housing 30, and a bottom flow channel 11 is formed between the side surface of the installation housing 10 and the side surface of the bottom housing 30 for communicating the bottom of the first screening cavity 19 or the bottom of the second screening cavity 22 with the bottom cavity 12. Since the front liquid pushing plate 15 and the rear liquid pushing plate 14 will continuously move up and down, the slag falling from the first screen 16 or the second screen 28 will be shaken and move into the bottom cavity 12 through the bottom flow channel 11. A vibration device 7 for vibrating the water flow in the bottom cavity 12 is arranged in the bottom cavity 12. The vibration device 7 includes an upper housing 704 installed at the bottom of the installation housing 10. The bottom of the upper housing 704 is fixedly installed with a lower housing 709 through a central guiding column 702. A sliding sleeve 703 is slidably installed on the central guiding column 702, and an annular frame 706 for pushing the water flow is fixedly installed on the outer side of the sliding sleeve 703. A sealing rubber membrane 708 for isolating the water flow is fixedly installed between the outer side of the upper housing 704 and the outer side of the lower housing 709, and the sealing rubber membrane 708 is fixedly installed on the outside of the annular frame 706. A second driving motor 707 is fixedly installed on the lower housing 709, and the output end of the second driving motor 707 drives the sliding sleeve 703 to move upward along the central guiding column 702 through a second cam 705. A second return spring 701 for driving the sliding sleeve 703 to reset downward is fixedly installed between the sliding sleeve 703 and the lower housing 709. The second driving motor 707 is electrically connected to the controller 9. When the second driving motor 707 rotates, the sliding sleeve 703 will be pushed upward by the convex part of the cam. Subsequently, when the convex end of the cam rotates to other positions, the sliding sleeve 703 can move downward under the traction of the second return spring 701, so that the sliding sleeve 703 realizes periodic up and down movement. The sliding sleeve 703 can drive the annular frame 706 and the sealing rubber membrane 708 to vibrate up and down, so that the water flow in the bottom cavity 12 can vibrate up and down periodically, which can avoid problems such as accumulation, adhesion, and blockage caused by the slag in the water flow staying in the same place for a long time, facilitate the subsequent discharge of the slag, and reduce the trouble of manual cleaning and maintenance. Further solve the problems of large water consumption, easy blockage, and easy reduction of washing efficiency of the existing jig, and can effectively improve the working reliability and water-saving ability of the jig.

[0042] Embodiment 4: Please refer to Figure 1 , Figure 2 , Figure 4 , Figure 6 and Figure 10, on the basis of Embodiment 3, a storage device 8 for collecting slag is provided at the bottom of the bottom housing 30. The storage device 8 includes a storage tank 802 fixedly installed with the bottom housing 30, and a storage chamber 803 for storing slag and communicating with the bottom chamber 12 is provided inside the storage tank 802. A closing device 2 for closing the storage chamber 803 is fixedly installed at the bottom of the bottom housing 30. The closing device 2 includes a push rod 203 fixedly installed with the bottom housing 30. A push frame 204 that moves up and down is driven at the output end of the push rod 203. A steering motor 207 is fixedly installed on the push frame 204. A worm 206 is driven at the output end of the steering motor 207. A bottom cover 202 for closing the bottom of the storage chamber 803 is driven at the output end of the push frame 204. A worm gear 205 meshing with the worm 206 is fixedly installed on the rotating shaft of the bottom cover 202. A closing plug 201 for preventing the bottom cover 202 from rotating and inserted into the storage chamber 803 is fixedly installed at the top of the bottom cover 202. Both the push rod 203 and the steering motor 207 are electrically connected to the controller 9. When it is necessary to discharge the slag located inside the storage chamber 803, first, the bottom cover 202 is driven downward by the push rod 203 so that the closing plug 201 is pulled out of the storage chamber 803. Subsequently, by changing the inclination angle of the bottom cover 202 through the steering motor 207, the materials located inside the storage chamber 803 can be discharged normally. The push rod 203 can use a hydraulic push rod. The worm gear and worm mechanism composed of the worm gear 205 and the worm 206 also has a self-locking function to keep the bottom cover 202 at a specified inclination angle. When it is necessary to close the storage chamber 803 through the closing device 2, first, the bottom cover 202 is adjusted to a horizontal state through the steering motor 207, and then the closing plug 201 is inserted into the storage chamber 803 under the drive of the push rod 203. Both the closing plug 201 and the bottom cover 202 are hard plates wrapped with anti-seepage rubber membranes on the outside, so that water flow and slag can be prevented from leaking out of the storage chamber 803. Using the closing device 2 to control the discharging of the storage device 8 can achieve intermittent discharging, without having to make the water flow out of the bottom chamber 12 all the time, thereby reducing the water consumption during discharging.An annular flow channel is formed at the bottom of the bottom cavity 12, and the annular flow channel is communicated with the storage cavity 803 through at least one blanking pipe 801. A rotary motor 13 electrically connected to the controller 9 is fixedly installed at the center of the bottom shell 30 corresponding to the annular flow channel, and the rotary motor 13 is used to drive the pressing device 4 located in the annular flow channel to rotate. The pressing device 4 includes a central plate 402 fixedly installed coaxially with the output shaft of the rotary motor 13, and a pushing and scraping blade 401 for closing the upper end of the blanking pipe 801 and scraping the inner wall of the bottom cavity 12 is fixedly installed on the central plate 402. An arc-shaped pressing end 403 for pressing the slag into the blanking pipe 801 is integrally formed on one side of the pushing and scraping blade 401, and an arc-shaped feeding end 404 for guiding the slag into the lower part of the arc-shaped pressing end 403 is integrally formed on the other end of the pushing and scraping blade 401. The slag in the bottom cavity 12 will be gradually stratified under the vibration of the vibration device 7, so that the slag with larger mass can enter the arc-shaped pressing end 403 along the arc-shaped feeding end 404. When the pushing and scraping blade 401 rotates, the arc-shaped pressing end 403 will form a downward extrusion force, and the slag with larger mass will be gradually fed to the bottom of the arc-shaped pressing end 403 under the dual action of the extrusion force and the centrifugal force, while the water with lighter mass will be extruded from the bottom of the arc-shaped pressing end 403. When the arc-shaped pressing end 403 moves to the position corresponding to the blanking pipe 801, the arc-shaped pressing end 403 presses the slag into the blanking pipe 801 and stores it in the storage cavity 803, and the water flow originally in the storage cavity 803 is squeezed back into the bottom cavity 12 again. In this way, the slag in the bottom cavity 12 can be gradually fed into the storage cavity 803 to wait for discharging, and the pressing device 4 itself will also scrape the inner wall of the bottom cavity 12 to prevent the slag from blocking the bottom cavity 12. On the other hand, since the pressing device 4 also realizes two functions, on the one hand, it can use the bottom of the pushing and scraping blade 401 to close the upper end of the blanking pipe 801. In this way, when the storage cavity 803 needs to discharge materials, first closing the blanking pipe 801 with the pushing and scraping blade 401 can prevent the water flow in the bottom cavity 12 from flowing out, thus reducing the waste of water flow. On the other hand, the slag is pressed into the storage cavity 803 by the pressing device 4. Compared with the traditional method of using gravity and water pressure to discharge the slag, a greater driving force for the slag can be obtained, so there is no need to worry about the problem of the slag blocking the blanking pipe 801 and the storage cavity 803. Moreover, even if the storage device 8 is blocked, the bottom cover 202 can be directly opened to quickly clean from the lower part of the storage cavity 803 without affecting the normal operation of the jig washer. Therefore, it is more convenient to use. Further solves the problems of large water consumption, easy blockage, and easy reduction of washing efficiency of the existing jig, and can effectively improve the working reliability and water-saving ability of the jig.

[0043] Embodiment 5: On the basis of Embodiment 4, the present invention further provides a method for using a jig washer for coal washing and selection, including the following steps:

[0044] Step 1: During use, first inject water flow into the first screening chamber 19 and the second screening chamber 22 through the water inlet pipe 17. At this time, the water flow will fill the corresponding inner part of the bottom housing 30 and flow out through the end discharge port 25. Subsequently, inject coal mine raw materials into the first screening chamber 19 through the feed inlet 18. At this time, the coal mine raw materials will gradually move from the front end of the main frame body 1 to the rear end of the main frame body 1 under the push of the water flow;

[0045] Step 2: Subsequently, the operator issues a beneficiation instruction through the controller 9. At this time, the controller 9 will control the power device 5 to drive the rear liquid pushing plate 14 and the front liquid pushing plate 15 to perform periodic up and down movements. The rear liquid pushing plate 14 and the front liquid pushing plate 15 will push the water flow located above them and drive the coal mine in the water flow to vibrate up and down. During the vibration process, the slag with a smaller particle size that can pass through the first screen 16 and the second screen 28 will move downward into the inner part of the bottom housing 30 and finally be discharged from the bottom of the bottom housing 30. The coal mine raw materials in the first screening chamber 19 will gradually be stratified into a mixed coal layer located in the upper layer and a coal gangue layer located in the lower layer under the push of the corresponding front liquid pushing plate 15. Subsequently, the mixed coal layer will cross the isolation frame 29 under the push of the water flow and enter the second screening chamber 22, while the coal gangue layer will be in a suspended state under the push of the corresponding rear liquid pushing plate 14 and thus be more easily pushed by the water flow into the corresponding discharge channel 27. The mixed coal layer entering the second screening chamber 22 will gradually be stratified into a clean coal layer located in the upper layer and a medium coal layer located in the lower layer under the push of the corresponding front liquid pushing plate 15. Among them, the clean coal layer will be discharged from the end discharge port 25 under the push of the water flow, while the medium coal layer will be in a suspended state under the push of the rear liquid pushing plate 14 and will be more easily pushed into the corresponding discharge channel 27 under the push of the water flow. At the same time, the slag passing through the first screen 16 or the second screen 28 will be transported to the storage chamber 803 under the combined action of the vibration device 7 and the pressure material device 4 and finally be discharged by opening the bottom cover 202;

[0046] Step 3: When the coal gangue layer accumulates to a specified height in the first screening chamber 19, the operator opens the corresponding discharge motor 26 and uses the discharge motor 26 to drive the discharge shaft 3 corresponding to the first screening chamber 19 to discharge the coal gangue from the corresponding discharge channel 27. When the medium coal layer accumulates to a specified height in the second screening chamber 22, the operator opens the corresponding discharge motor 26 and drives the discharge shaft 3 corresponding to the second screening chamber 22 to discharge the medium coal from the corresponding discharge channel 27. At the same time, the triangular pushing plate 606 will send the coal gangue located on the first screen 16 or the medium coal located on the second screen 28 into the corresponding discharge channel 27 to facilitate the discharge by the discharge shaft 3.

[0047] Although the above description of the illustrative embodiments of the present application has been provided to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all applications and creations using the concept of the present application are within the scope of protection.

Claims

1. A jig washer for coal washing, characterized in that, Including: A main frame body (1), the interior of the main frame body (1) is divided into a second screening chamber (22) and a first screening chamber (19) by a partition frame (29). A feed inlet (18) for feeding and a water inlet pipe (17) for supplying water are arranged at the front end of the first screening chamber (19), and an end discharge port (25) for discharging clean coal is arranged at the rear end of the second screening chamber (22). A first screen (16) is arranged in the first screening chamber (19), and a second screen (28) is arranged in the second screening chamber (22). A bottom housing (30), the main frame body (1) is provided with a bottom housing (30) for discharging slag at the bottom corresponding to the first screening chamber (19) and the second screening chamber (22). An installation housing (10) is fixedly installed in the bottom housing (30). A front end liquid pushing plate (15) corresponding to the front end of the first screening chamber (19) or the front end of the second screening chamber (22) is fixedly installed in the installation housing (10), and the front end liquid pushing plate (15) is used for stratifying the coal mine in the first screening chamber (19) or the second screening chamber (22) by vertically pushing the water flow. A rear end liquid pushing plate (14) corresponding to the rear end of the first screening chamber (19) or the rear end of the second screening chamber (22) is fixedly installed in the installation housing (10), and the rear end liquid pushing plate (14) is used for floating the medium coal or coal gangue above the first screen (16) and the second screen (28) by vertically pushing the water flow. A power device (5) for driving the front end liquid pushing plate (15) and the rear end liquid pushing plate (14) to move vertically is arranged in the bottom housing (30).

2. The jig washer for coal washing according to claim 1, characterized in that: A top cover (24) for sealing the main frame body (1) is fixedly installed at the top of the main frame body (1), and the top cover (24) is used to prevent the water or coal mine in the first screening chamber (19) and the second screening chamber (22) from splashing out. A handle (23) for conveniently opening the top cover (24) is fixedly installed on the top cover (24), and a transparent observation window (21) for conveniently observing the working conditions in the first screening chamber (19) and the second screening chamber (22) is fixedly installed on the top cover (24). Discharge channels (27) for discharging medium coal or coal gangue are respectively arranged at the rear ends of the main frame body (1) corresponding to the first screen (16) and the second screen (28). A discharge shaft (3) for discharging the medium coal or coal gangue by extruding the medium coal or coal gangue during rotation is rotatably installed in the discharge channel (27). A discharge motor (26) for driving the discharge shaft (3) is fixedly installed on the main frame body (1). A controller (9) electrically connected to the power device (5) and the discharge motor (26) is fixedly installed on the main frame body (1).

3. The jig washer for coal washing according to claim 2, characterized in that: A guide rail (20) is fixedly installed on the top cover (24) along the front-back direction, and a pusher device (6) for pushing coal movement is arranged on the guide rail (20). The pusher device (6) includes a moving seat (602) slidably installed on the guide rail (20), and an auxiliary motor (601) electrically connected to a controller (9) is fixedly installed on the moving seat (602). A driving wheel (603) is driven at the output end of the auxiliary motor (601). A rack meshing with the driving wheel (603) is arranged on the guide rail (20), and a connecting arm (604) is arranged below the moving seat (602). A triangular pusher plate (606) for scraping the upper surface of the first screen (16) or the upper surface of the second screen (28) is arranged below the connecting arm (604). A vertical pusher end (605) for pushing gangue or medium coal located on the first screen (16) or the second screen (28) into the discharge channel (27) is arranged at the triangular pusher plate (606) in the direction towards the rear end of the main frame body (1), and an inclined end (607) for shoveling gangue or medium coal located on the first screen (16) or the second screen (28) is arranged at the triangular pusher plate (606) in the direction towards the front end of the main frame body (1).

4. A jig washer for coal washing according to claim 2, characterized in that: The discharge shaft (3) includes a central shaft body (303) fixedly installed at the output end of a discharge motor (26), and at least four support plates (302) are arranged in a circumferential array on the central shaft body (303). A material trough (301) for accommodating medium coal or gangue is formed between the support plates (302). Rubber sleeves (304) are wrapped on both the support plates (302) and the central shaft body (303), and the outer wall surface of the rubber sleeve (304) is in sealing fit with the inner wall surface of the discharge channel (27).

5. A jig washer for coal washing according to claim 1, characterized in that: Both the rear end liquid pusher plate (14) and the front end liquid pusher plate (15) are sealed with the installation housing (10) through an isolation rubber membrane, and the installation housing (10) and the bottom housing (30) are fixedly installed through bolts.

6. The jig washer for coal washing according to claim 1, wherein: Independent power devices (5) are respectively used in the installation housing (10) to drive the rear end liquid pusher plate (14) and the front end liquid pusher plate (15) to move. The power device (5) includes a top slide bar (501) fixedly installed on the rear end liquid pusher plate (14) or the front end liquid pusher plate (15). The top slide bar (501) is slidably installed in a bottom sleeve (504). The bottom of the bottom sleeve (504) is fixedly installed on a bottom connecting plate (506). A first return spring (505) for driving the top slide bar (501) to slide downward is installed between the bottom connecting plate (506) and the top slide bar (501). The bottom connecting plate (506) is fixedly installed with the installation housing (10), and a first driving motor (502) is fixedly installed on the bottom connecting plate (506). The output end of the first driving motor (502) drives the top slide bar (501) to move upward through a first cam (503).

7. A jig washer for coal washing according to claim 1, characterized in that: A bottom cavity (12) is formed between the bottom of the installation housing (10) and the bottom of the bottom housing (30), and a bottom flow channel (11) for communicating the bottom of the first screening cavity (19) or the bottom of the second screening cavity (22) with the bottom cavity (12) is formed between the side surface of the installation housing (10) and the side surface of the bottom housing (30). A vibration device (7) for vibrating the water flow located in the bottom cavity (12) is arranged in the bottom cavity (12). The vibration device (7) includes an upper housing (704) installed at the bottom of the installation housing (10), and a lower housing (709) is fixedly installed at the bottom of the upper housing (704) through a central guide post (702). A sliding sleeve (703) is slidably installed on the central guide post (702), and an annular frame (706) for pushing the water flow is fixedly installed on the outer side of the sliding sleeve (703). A sealing rubber membrane (708) for isolating the water flow is fixedly installed between the outer side of the upper housing (704) and the outer side of the lower housing (709), and the sealing rubber membrane (708) is fixedly installed with the outside of the annular frame (706). A second driving motor (707) is fixedly installed on the lower housing (709), and the output end of the second driving motor (707) drives the sliding sleeve (703) to move upward along the central guide post (702) through a second cam (705), and a second return spring (701) for driving the sliding sleeve (703) to reset downward is fixedly installed between the sliding sleeve (703) and the lower housing (709).

8. A jig washer for coal washing according to claim 7, characterized in that: A storage device (8) for collecting slag is arranged at the bottom of the bottom housing (30). The storage device (8) includes a storage tank (802) fixedly installed with the bottom housing (30), and a storage cavity (803) communicated with the bottom cavity (12) and used for storing slag is arranged inside the storage tank (802). A closing device (2) for closing the storage cavity (803) is fixedly installed at the bottom of the bottom housing (30). The closing device (2) includes a push rod (203) fixedly installed with the bottom housing (30). The output end of the push rod (203) drives a push frame (204) to move up and down, and an alignment motor (207) is fixedly installed on the push frame (204). The output end of the alignment motor (207) drives a worm (206), and the output end of the push frame (204) drives a bottom cover (202) for closing the bottom of the storage cavity (803). A worm gear (205) meshed with the worm (206) is fixedly installed on the rotating shaft of the bottom cover (202), and a closing plug (201) inserted into the storage cavity (803) for preventing the bottom cover (202) from rotating is fixedly installed at the top of the bottom cover (202).

9. A jig washer for coal washing according to claim 8, characterized in that: The bottom of the bottom cavity (12) forms an annular flow channel, and the annular flow channel is communicated with the storage cavity (803) through at least one blanking pipe (801). A rotary motor (13) electrically connected to the controller (9) is fixedly installed at the center corresponding to the annular flow channel on the bottom shell (30), and the rotary motor (13) is used to drive the pressing device (4) located in the annular flow channel to rotate. The pressing device (4) includes a central plate (402) fixedly installed coaxially with the output shaft of the rotary motor (13), and a pushing and scraping blade (401) for closing the upper end of the blanking pipe (801) and scraping the inner wall of the bottom cavity (12) is fixedly installed on the central plate (402). An arc-shaped pressing end (403) for pressing slag into the blanking pipe (801) is integrally formed on one side of the pushing and scraping blade (401), and an arc-shaped feeding end (404) for guiding the slag into the lower part of the arc-shaped pressing end (403) is integrally formed at the other end of the pushing and scraping blade (401).

10. The usage method of a jig washer for coal washing as described in claim 9, characterized in that, Including the following steps: Step 1: During use, first, water is injected into the first screening cavity (19) and the second screening cavity (22) through the water inlet pipe (17). At this time, the water will fill the corresponding interior of the bottom shell (30) and flow out through the end discharge port (25). Subsequently, coal mine raw materials are injected into the first screening cavity (19) through the feed port (18). At this time, the coal mine raw materials will gradually move from the front end of the main frame body (1) to the rear end of the main frame body (1) under the push of the water flow; Step 2: Subsequently, the operator controls the power device (5) to drive the rear liquid pushing plate (14) and the front liquid pushing plate (15) to perform periodic up and down movements. The rear liquid pushing plate (14) and the front liquid pushing plate (15) will push the water flow located above them and drive the coal mine in the water flow to vibrate up and down. During the vibration, the slag with a smaller particle size that can pass through the first screen (16) and the second screen (28) will move downward to the inside of the bottom shell (30) and finally be discharged from the bottom of the bottom shell (30). The coal mine raw materials located in the first screening cavity (19) will be gradually stratified into a mixed coal layer located in the upper layer and a coal gangue layer located in the lower layer under the push of the corresponding front liquid pushing plate (15). Subsequently, the mixed coal layer will cross the isolation frame (29) and enter the second screening cavity (22) under the push of the water flow, while the coal gangue layer will be in a suspended state under the push of the corresponding rear liquid pushing plate (14) and is thus more easily pushed by the water flow into the corresponding discharge flow channel (27). The mixed coal layer entering the second screening cavity (22) will be gradually stratified into a clean coal layer located in the upper layer and a medium coal layer located in the lower layer under the push of the corresponding front liquid pushing plate (15). Among them, the clean coal layer will be discharged from the end discharge port (25) under the push of the water flow, while the medium coal layer will be in a suspended state under the push of the rear liquid pushing plate (14) and is more easily pushed into the corresponding discharge flow channel (27) under the push of the water flow; Step 3: After the coal gangue layer accumulates to a specified height in the first screening chamber (19), the operator discharges the coal gangue in the coal gangue layer. After the medium coal layer accumulates to a specified height in the second screening chamber (22), the operator discharges the medium coal in the medium coal layer.

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