Coal jigging device

Abstract

The invention discloses a coal jigging device and belongs to the technical field of jiggers, the coal jigging device comprises a case and a sieve plate assembly mounted above the inner side of the case, the sieve plate assembly comprises a first sieve plate, a second sieve plate and a third sieve plate which are arranged in parallel, and the first sieve plate, the second sieve plate and the third sieve plate are connected through limiting assemblies; the third sieve plate is mounted on the lower side of the second sieve plate in a manner of clinging to the lower surface of the second sieve plate; a plurality of first through holes are formed in the first sieve plate, second through holes in one-to-one correspondence with the first through holes are formed in the second sieve plate, third through holes in one-to-one correspondence with the second through holes are formed in the third sieve plate, and first sieve holes are formed in the overlapped parts of the projections of the first through holes, the second through holes and the third through holes in the vertical direction. According to the device, when the first screen holes of the screen plate are abraded, the hole diameters of the first screen holes can be compensated in time, and the problem of shutdown caused by replacement or maintenance of the screen plate is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of jigs, and in particular relates to a jig coal cleaning device. Background Art

[0002] Jigging is a common gravity coal cleaning method. Its principle is to achieve coal separation based on the difference in the settling speed of particles in pulsating water flow. Particles of different densities have different settling speeds in pulsating water flow. During the rising water flow, the bed is loosened and the particles begin to stratify. Particles with higher density (such as gangue) are subject to a smaller upward force in the rising water flow relative to their gravity, and their settling speed is fast. Particles with lower density (such as clean coal) are subject to a larger upward force relative to their gravity, and their settling speed is slow. The screen plate, air valve, discharge device and other components of the jig are prone to wear under long-term contact with coal particles and the impact of pulsating water flow. Parts need to be replaced regularly, which increases the maintenance cost and downtime of the equipment. When the existing jig is in use, it is easy to cause wear to the first screen hole of the screen plate. The aperture of the first screen hole becomes larger after wear, which affects the accuracy of coal cleaning. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a jigging coal cleaning device, which can compensate the aperture of the first sieve hole in time when the first sieve hole of the sieve plate is worn, thereby solving the shutdown problem caused by the need to replace or repair the sieve plate and improving the accuracy and efficiency of coal cleaning.

[0004] In order to achieve the above object, the present invention provides the following technical solutions: A jigging coal cleaning device disclosed in the present invention comprises a chassis and a sieve plate assembly installed on the upper inner side of the chassis, the sieve plate assembly comprises a first sieve plate, a second sieve plate and a third sieve plate arranged in parallel, the first sieve plate, the second sieve plate and the third sieve plate are connected by a limiting assembly, the second sieve plate is installed on the lower side of the first sieve plate close to the lower surface of the first sieve plate, and the third sieve plate is installed on the lower side of the second sieve plate close to the lower surface of the second sieve plate; a plurality of first through holes are provided on the first sieve plate, the second sieve plate is provided with second through holes corresponding to the first through holes one by one, the third sieve plate is provided with third through holes corresponding to the second through holes one by one, the overlapping part of the projections of the first through holes, the second through holes and the third through holes in the vertical direction form the first sieve hole, the first sieve plate and the second sieve plate are both connected with a longitudinal displacement control device, and the third sieve plate is connected with a transverse position control device.

[0005] Furthermore, the first sieve plate, the second sieve plate and the third sieve plate are all equipped with large holes, and the limiting assembly includes a pressure plate, an elastic pull rod and a nut. The elastic pull rod is connected with nuts at both ends after passing through the large holes of the three sieve plates. The upper side of the first sieve plate and the lower side of the third sieve plate are both equipped with pressure plates, and the pressure plates are sleeved on the outside of the elastic pull rods. The two pressure plates are pressed against the surface of the sieve plates by two nuts respectively.

[0006] Furthermore, embedding grooves are provided on the surface of the pressure plate, and the embedding grooves are evenly distributed on the outer edge of the pressure plate with the elastic pull rod as the center. Balls are rotatably installed in the embedding grooves, and the balls are in contact with the surface of the screen plate.

[0007] Furthermore, a plurality of inclined plates are evenly spaced apart on the upper side of the first sieve plate, the inclined plates are inclined toward the flow direction of the water flow, and second sieve holes are formed on the inclined plates.

[0008] Furthermore, the inclined plate is made of spring steel material.

[0009] Furthermore, the longitudinal displacement control device includes a vertical telescopic connecting rod, a rack, a slide, a gear and a first motor. The first screen plate or the second screen plate is connected to the rack through the telescopic connecting rod. The rack is slidably matched with the slide. The slide and the first motor are fixed to the chassis. The rack is also meshed with the gear, and the gear is connected to the first motor.

[0010] Furthermore, the telescopic connecting rod includes an outer rod, an inner rod and a spring, the outer rod is connected to the first sieve plate or the second sieve plate, one end of the inner rod is slidably installed on the inner side of the outer rod, the other end of the inner rod is fixedly connected to the rack, the spring is sleeved on the outer side of the inner rod, and the two ends of the spring are respectively fixedly connected to the outer rod and the rack.

[0011] Furthermore, a sieve hole detection assembly is installed below the sieve plate assembly, and the sieve hole detection assembly includes a pressure sensor, a detection column, a hydraulic cylinder, a slide and a plane displacement drive assembly. The slide is installed on the output end of the plane displacement drive assembly, and a hydraulic cylinder is fixed on the slide. The output end of the hydraulic cylinder is connected to the detection column, and the upper end of the detection column is installed with a pressure sensor.

[0012] The beneficial effects of the present invention are: The present invention discloses a jigging coal cleaning device, which is provided with three adjacent sieve plates, wherein the first sieve hole is formed by the overlapping part of the projection of the through holes on the three sieve plates in the vertical direction. When the first sieve hole is enlarged due to wear, the position of the sieve plate can be moved in the longitudinal and transverse directions, so that the outer edge position of the first sieve hole is adjusted, thereby compensating for the inner diameter of the sieve hole, solving the shutdown problem caused by the need to replace or repair the sieve plate, and improving the accuracy and efficiency of coal cleaning.

[0013] In the device of the present invention, by arranging the first sieve hole formed by three sieve plates, the screening capacity of the first sieve hole can be guaranteed under the condition of a suitable number of sieve plates, the compensation method is simpler and the control is convenient.

[0014] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration: Figure 1 It is a structural schematic diagram of the jigging coal preparation device of the present invention; Figure 2 It is a structural schematic diagram of the sieve plate assembly of the present invention; Figure 3 It is a schematic diagram of the structure of three sieve plates; Figure 4 It is a schematic diagram of the combination of three sieve plates; Figure 5 is a structural schematic diagram of a longitudinal displacement control device; Figure 6 It is a structural schematic diagram of the limit assembly; Figure 7 It is a schematic diagram of the structure of the sieve hole detection component.

[0016] The markings in the accompanying drawings are as follows: chassis 1, sieve plate assembly 2, first sieve plate 3, second sieve plate 4, third sieve plate 5, limit assembly 6, first through hole 7, second through hole 8, third through hole 9, longitudinal displacement control device 10, large hole 11, pressure plate 12, elastic pull rod 13, nut 14, groove 15, ball 16, inclined plate 17, second sieve hole 18, vertical telescopic connecting rod 19, rack 20, slide seat 21, gear 22, first motor 23, outer rod 24, inner rod 25, spring 26, sieve hole detection assembly 27, pressure sensor 28, detection column 29, hydraulic cylinder 30, slide 31, planar displacement drive assembly 32. DETAILED DESCRIPTION

[0017] like Figures 1 to 7As shown, a jigging coal selection device disclosed in the present invention comprises a chassis 1 and a sieve plate assembly 2 installed on the upper inner side of the chassis 1. The chassis 1 adopts the existing structure, and the feeder feeds raw coal or ore and other materials to the sieve plate assembly 2 of the jig machine evenly and stably. The feeding speed needs to be reasonably adjusted according to the processing capacity and sorting effect of the jig machine. The pulsation mechanism provides the power of water flow pulsation. When the compressed air is alternately fed into the air chamber, the water in the jig chamber is forced to rise to form an ascending water flow; when the compressed air in the air chamber is discharged, the water level in the jig chamber automatically drops to form a descending water flow. The function of the sieve plate assembly 2 is to support the material and enable the water to pass through the sieve holes to form ascending and descending water flows. The parameters such as the aperture and opening rate of the sieve plate assembly 2 will affect the speed and uniformity of the water flow, and then affect the stratification effect of the material. Generally speaking, the aperture of the sieve plate assembly 2 is selected according to the particle size of the selected material to ensure that the material can form a stable bed on the sieve plate assembly 2, while allowing the heavy products of fine particles to pass through the sieve and be discharged. During the material stratification process, the bed layer detection device monitors the thickness, density and other parameters of the bed layer in real time, and feeds back the signal to the control system. According to the feedback information, the operator or the automatic control system can timely adjust the operating parameters of the jig machine, such as the jigging frequency, amplitude, air volume, water volume, etc., to ensure that the bed layer is always in a good stratified state. The discharge mechanism is responsible for discharging the heavy and light products after stratification from the jig machine respectively.

[0018] The sieve plate assembly 2 disclosed in the present invention includes a first sieve plate 3, a second sieve plate 4, and a third sieve plate 5 arranged in parallel, and the three sieve plates are all rectangular. The first sieve plate 3, the second sieve plate 4, and the third sieve plate 5 are connected in the thickness direction by a limit assembly 6 to limit the separation of the three sieve plates. The second sieve plate 4 is installed on the lower side of the first sieve plate 3 closely against the lower surface of the first sieve plate 3, and the third sieve plate 5 is installed on the lower side of the second sieve plate 4 closely against the lower surface of the second sieve plate 4, to ensure the sealing between the plates and prevent impurities from entering.

[0019] Specifically, the first sieve plate 3 is provided with a plurality of first through holes 7, the second sieve plate 4 is provided with second through holes 8 corresponding one-to-one to the first through holes 7, the third sieve plate 5 is provided with third through holes 9 corresponding one-to-one to the second through holes 8, the first through holes 7, the second through holes 8 and the third through holes 9 are all circular, the overlapping parts of the projections of the first through holes 7, the second through holes 8 and the third through holes 9 in the vertical direction form the first sieve holes, the first sieve plates 3 and the second sieve plates 4 are both connected with longitudinal displacement control devices 10, and the third sieve plate 5 is connected with a transverse position control device.

[0020] Taking the flow direction of water flow as the longitudinal direction, the present invention installs longitudinal displacement control devices 10 on the first sieve plate 3 and the second sieve plate 4 respectively, thereby driving the first sieve plate 3 and the second sieve plate 4 to displace along the longitudinal direction, and both can evenly compensate for the longitudinal edge position of the first sieve hole, and the third through hole 9 on the third sieve plate 5 can compensate for the transverse edge position of the first sieve hole after the transverse displacement, so that all the outer edge positions of the first sieve hole are adjusted, thereby compensating for the inner diameter of the sieve hole as a whole, solving the shutdown problem caused by the need to replace or repair the sieve plate, improving the accuracy and efficiency of coal selection, and will not affect the speed and uniformity of the water flow, stabilizing the stratification effect of the material.

[0021] In this embodiment, large holes 11 are installed on the first sieve plate 3, the second sieve plate 4, and the third sieve plate 5. The limiting assembly 6 includes a pressure plate 12, an elastic pull rod 13, and a nut 14. The elastic pull rod 13 is connected with nuts 14 at both ends after passing through the large holes 11 of the three sieve plates. The diameter of the large hole 11 is larger than the diameter of the elastic pull rod 13. The elastic pull rod 13 can be displaced radially in the large hole 11. Pressure plates 12 are installed on the upper side of the first sieve plate 3 and the lower side of the third sieve plate 5. The pressure plates 12 are sleeved on the outer side of the elastic pull rod 13, and the two pressure plates 12 are pressed against the surface of the sieve plates by two nuts 14 respectively. The first sieve plate 3, the second sieve plate 4 and the third sieve plate 5 can be elastically compressed along the thickness direction through two pressing plates 12, but will not cause any obstruction to the sieve plates in the longitudinal or transverse direction. The elastic pull rod 13 is made of elastic material, and the three sieve plates can also have a certain displacement space in the thickness direction. When the water flow pulsates up and down, the sieve plate assembly 2 can also pulsate with the water flow, thereby improving the stratification effect of the coal mine.

[0022] In this embodiment, an embedding groove 15 is opened on the surface of the pressure plate 12, and the embedding groove 15 is evenly distributed on the outer edge of the pressure plate 12 with the elastic pull rod 13 as the center. Balls 16 are rotatably installed in the embedding groove 15. The ball 16 contacts the surface of the screen plate, which can reduce friction and thus reduce the longitudinal or lateral obstruction to the screen plate.

[0023] In this embodiment, a plurality of inclined plates 17 are evenly spaced on the upper side of the first screen plate 3, the inclined plates 17 are inclined toward the flow direction of the water flow, and a second screen hole 18 is provided on the inclined plates 17. The stratification ability of the coal mine is further improved by providing the inclined plates 17, which are made of spring 26 steel material and can be elastically buffered to a certain extent in the direction of the water flow. The stratification effect of the coal mine can be improved between the inclined plates 17, and the separation effect of impurities such as coal and gangue with similar density and small particle size is increased.

[0024] In this embodiment, the longitudinal displacement control device 10 includes a vertical telescopic connecting rod 19, a rack 20, a slide 21, a gear 22 and a first motor 23. The first sieve plate 3 or the second sieve plate 4 is connected to the rack 20 through the telescopic connecting rod. The rack 20 and the slide 21 are slidably matched. The slide 21 and the first motor 23 are fixed to the chassis 1. The rack 20 is meshed with the gear 22 at the same time, and the gear 22 is connected to the first motor 23. The longitudinal displacement is controlled by the gear 22 and the rack 20, which is more convenient to control. By setting the telescopic connecting rod, the vertical displacement of the sieve plate will not be hindered.

[0025] In this embodiment, the telescopic connecting rod includes an outer rod 24, an inner rod 25 and a spring 26. The outer rod 24 is connected to the first sieve plate 3 or the second sieve plate 4. One end of the inner rod 25 is slidably mounted on the inner side of the outer rod 24. The other end of the inner rod 25 is fixedly connected to the rack 20. The spring 26 is sleeved on the outer side of the inner rod 25. The two ends of the spring 26 are respectively fixedly connected to the outer rod 24 and the rack 20. A certain elastic recovery ability can be provided to the sieve plate in the vertical direction. The overall device structure is simple and the telescopic process is more stable.

[0026] In the embodiment of the present invention, the structures of the two longitudinal displacement control devices 10 are exactly the same. For the lateral displacement control device, the structure of the lateral displacement control device is also the same as the structure of the longitudinal displacement control device 10, except that in the setting direction of the rack 20, the rack 20 of the lateral displacement control device is along the lateral direction, which can be understood by those skilled in the art.

[0027] In this embodiment, a sieve hole detection assembly 27 is installed below the sieve plate assembly 2. The sieve hole detection assembly 27 includes a pressure sensor 28, a detection column 29, a hydraulic cylinder 30, a slide 31 and a plane displacement driving assembly 32. The slide 31 is installed at the output end of the plane displacement driving assembly 32. The hydraulic cylinder 30 is fixed on the slide 31. The output end of the hydraulic cylinder 30 is connected to the detection column 29. The upper end of the detection column 29 is installed with a pressure sensor 28. The detection column 29 can be used to detect the diameter of the first sieve hole. The plane displacement driving assembly 32 drives the slide 31 to move to different detection positions so that the detection column 29 is located directly below the first sieve hole. When the detection column 29 is extended, if the pressure sensor 28 on the detection column 29 does not respond, the detection column 29 is retracted, and the longitudinal displacement control device 10 and the lateral displacement control device are adjusted to reduce the diameter of the first sieve hole according to the preset change degree until the pressure sensor 28 is normally subjected to pressure.

[0028] In the embodiment of the present invention, the plane displacement driving assembly 32 includes a belt, a pulley, a longitudinal guide rod, a transverse slide 21, a second motor, a transverse guide rod, a screw rod, a support and a third motor. The slide 31 is fixed to the middle of the belt, and the two ends of the belt are tensioned by two pulleys, one of which is connected to the second motor, and the second motor is fixed to the transverse slide 21. A longitudinal guide rod is connected between the two transverse slides 21, and the longitudinal guide rod passes through the slide 31 at the same time; a screw rod is threadedly connected to the transverse slide 21, and the two ends of the screw rod are rotatably connected to the support respectively, and the screw rod is also transmission-connected to the third motor, and the support is fixed to the lower side of the chassis 1. A transverse guide rod is also passed through the transverse slide 21, and the two ends of the transverse guide rod are respectively fixedly connected to the support.

[0029] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A jigging coal cleaning device, comprising a chassis and a sieve plate assembly installed on the upper inner side of the chassis, characterized in that: The sieve plate assembly includes a first sieve plate, a second sieve plate, and a third sieve plate which are arranged in parallel. The first sieve plate, the second sieve plate, and the third sieve plate are connected by a limiting assembly. The second sieve plate is installed on the lower side of the first sieve plate close to the lower surface of the first sieve plate, and the third sieve plate is installed on the lower side of the second sieve plate close to the lower surface of the second sieve plate; the first sieve plate is provided with a plurality of first through holes, the second sieve plate is provided with second through holes which correspond to the first through holes one by one, and the third sieve plate is provided with third through holes which correspond to the second through holes one by one. The overlapping part of the projections of the first through holes, the second through holes and the third through holes in the vertical direction form the first sieve holes. The first sieve plate and the second sieve plate are both connected with a longitudinal displacement control device, and the third sieve plate is connected with a transverse position control device.

2. A jigging coal cleaning device according to claim 1, characterized in that: The first sieve plate, the second sieve plate and the third sieve plate are all provided with large holes, and the limiting assembly includes a pressure plate, an elastic pull rod and a nut. The elastic pull rod is connected with nuts at both ends after passing through the large holes of the three sieve plates. A pressure plate is installed on the upper side of the first sieve plate and the lower side of the third sieve plate. The pressure plate is sleeved on the outer side of the elastic pull rod, and the two pressure plates are pressed against the surface of the sieve plates by two nuts respectively.

3. A jigging coal cleaning device according to claim 2, characterized in that: The surface of the pressing plate is provided with embedding grooves, which are evenly distributed on the outer edge of the pressing plate with the elastic pull rod as the center. Balls are rotatably installed in the embedding grooves, and the balls are in contact with the surface of the screen plate.

4. A jigging coal cleaning device according to claim 1, characterized in that: A plurality of inclined plates are evenly spaced apart on the upper side of the first sieve plate. The inclined plates are inclined toward the flow direction of the water flow, and second sieve holes are formed on the inclined plates.

5. A jigging coal cleaning device according to claim 4, characterized in that: The inclined plate is made of spring steel material.

6. A jigging coal cleaning device according to claim 1, characterized in that: The longitudinal displacement control device includes a vertical telescopic connecting rod, a rack, a slide, a gear and a first motor. The first screen plate or the second screen plate is connected to the rack through the telescopic connecting rod. The rack is slidably matched with the slide. The slide and the first motor are fixed to the chassis. The rack is also meshed with the gear, and the gear is connected to the first motor.

7. A jigging coal cleaning device according to claim 6, characterized in that: The telescopic connecting rod includes an outer rod, an inner rod and a spring. The outer rod is connected to the first sieve plate or the second sieve plate. One end of the inner rod is slidably installed on the inner side of the outer rod. The other end of the inner rod is fixedly connected to the rack. The spring is sleeved on the outer side of the inner rod. The two ends of the spring are fixedly connected to the outer rod and the rack respectively.

8. A jigging coal preparation device according to any one of claims 1 to 7, characterized in that: A sieve hole detection assembly is installed below the sieve plate assembly, and the sieve hole detection assembly includes a pressure sensor, a detection column, a hydraulic cylinder, a slide and a plane displacement drive assembly. The slide is installed on the output end of the plane displacement drive assembly, and a hydraulic cylinder is fixed on the slide. The output end of the hydraulic cylinder is connected to the detection column, and the upper end of the detection column is installed with a pressure sensor.

Images