Automatic grading coal preparation equipment and coal preparation method based on wet separation

Abstract

This invention discloses an automatic grading and coal preparation equipment based on wet separation, comprising a bottom plate, side plates, a first grading hopper, a second grading hopper, a first jigging mechanism, a second jigging mechanism, a flow rate regulating mechanism, and a control chip. A screening and conveying mechanism for screening and conveying tailings is located above the first grading hopper. The screening and conveying mechanism picks up suspended coal from the first grading hopper according to control commands from the control chip and conveys it. The first and second jigging mechanisms screen the coal and floating liquid in the first and second grading hoppers. The flow rate regulating mechanism is installed inside the side plates and connected to the first and second grading hoppers respectively, adjusting the cutting angle of the first and second grading hoppers according to control commands from the control chip. This invention solves the technical problems of existing wet coal preparation equipment, such as the inability to adjust the screening speed, a large particle size range, and the inability to perform grading screening during the screening process.

Description

Technical Field

[0001] This invention belongs to the field of coal preparation equipment technology, specifically relating to an automatic grading coal preparation equipment and method based on wet separation. Background Technology

[0002] There are many commonly used coal preparation methods, which can be divided into two categories according to the state of the medium used in the separation process: wet coal preparation and dry coal preparation. Wet coal preparation can be further divided into gravity separation, flotation, and some other special coal preparation methods.

[0003] Gravity coal preparation separates coal and minerals based on the density difference in a gravity field. Jigs are one type of modern gravity separation equipment. Due to their large processing capacity, wide particle size range, and simple operation and maintenance, they are widely used for roughing or cleaning minerals such as gold, tin, titanium, hematite, iron ore, and coal, and are particularly widely used in manganese ore beneficiation.

[0004] Patent CN108672077A discloses a jig that achieves screening by using two sets of feed hoppers and discharge hoppers moving in opposite directions. A push-pull drawer is movably installed on the front side wall of the discharge hopper for easy collection of ore. However, this jig has the following drawbacks: because it cannot adjust the flow rate of the suspension, the screening speed cannot be adjusted; the jig has a wide particle size range and cannot perform grading screening.

[0005] The patent with publication number CN116037276A provides an intelligent coal mill dynamic classifier with controllable discharge flow rate. This device solves the problem of inconvenient discharge flow rate control in existing coal mill dynamic classifiers by connecting the discharge port of the crushing zone to the first discharge pipe. The first discharge pipe is equipped with a discharge flow rate adjustment mechanism. When it is necessary to adjust the discharge flow rate, the micro motor is turned on. Under the action of the micro motor, the first gear drives the rotating disk and the moving hole on the rotating disk to rotate. The movement of the moving hole changes the gap between it and the discharge hole, thereby changing the discharge flow rate. This device addresses the problem of insufficient screening in existing dynamic coal mill classifiers by installing a collection and screening box at the bottom of the classifier body. The discharge end of the second discharge pipe is connected to the collection and screening box. Large particles of coal ash, after screening, enter the collection and screening box through the second discharge pipe and eventually fall above the screening plate. Under the action of a vibrator, the screening plate vibrates, causing the slider to move outside the slide rod. A spring acts as a buffer. The vibration of the screening plate further screens the coal ash above it. Smaller particles of coal ash fall through the screening plate into the bottom of the collection and screening box and are discharged from the discharge port of the first box. Larger particles of coal ash are discharged from the discharge port of the second box under the vibration of the screening plate. However, the discharge flow rate adjustment mechanism and screening plate of the dynamic coal mill classifier are not suitable for wet coal preparation equipment. Summary of the Invention

[0006] Technical problem to be solved: In order to solve the technical problems of existing wet coal preparation equipment that cannot adjust the screening speed, have a large separation particle size range, and cannot perform grading screening during the screening process, this invention proposes an automatic grading coal preparation equipment and coal preparation method based on wet separation.

[0007] Technical solution:

[0008] An automatic grading and coal preparation device based on wet separation, the automatic grading and coal preparation device includes a bottom plate, side plates, a first grading hopper, a second grading hopper, a first jig mechanism, a second jig mechanism, a flow rate regulating mechanism, and a control chip;

[0009] The side plate is vertically mounted on one side of the base plate; the base plate is provided with a third hinge plate, one end of the second grading hopper is hinged to the third hinge plate via a fourth hinge plate at its lower end, and the other end of the second grading hopper extends into the middle gap of the side plate; the second grading hopper is located below the first grading hopper and its length is greater than that of the first grading hopper, and a second hinge plate is provided on its side, and a first hinge plate is provided on the side of the end of the first grading hopper away from the side plate, and the first hinge plate is hinged to the first hinge plate; a screening and conveying mechanism for screening and conveying tailings is provided above the first grading hopper, and the screening and conveying mechanism picks up the suspended coal in the first grading hopper according to the control instructions of the control chip and conveys it;

[0010] The first jigging mechanism and the second jigging mechanism are respectively installed in the first grading hopper and the second grading hopper, and screen the coal and the liquid in the first grading hopper and the second grading hopper according to the control instructions of the control chip.

[0011] The flow rate adjustment mechanism is installed inside the side plate and is connected to the first and second grading hoppers respectively. It adjusts the cutting angle of the first and second grading hoppers according to the control instructions of the control chip.

[0012] Furthermore, the flow rate adjustment mechanism includes a first telescopic push rod, a second telescopic push rod, a first arc-shaped track, a second arc-shaped track, a first outer frame, and a second outer frame;

[0013] The first outer frame and the second outer frame are respectively vertically fixed to both ends of the side plate for fixing the first telescopic push rod and the second push rod; the telescopic end of the first telescopic push rod is hinged with a first connecting rod and a second connecting rod, and the telescopic end of the second telescopic push rod is hinged with a third connecting rod and a fourth connecting rod; the first connecting rod and the third connecting rod point in the same direction and are symmetrical, the second connecting rod and the fourth connecting rod point in the same direction and are symmetrical, a first motor is fixed between the first connecting rod and the third connecting rod, and a second motor is fixed between the second connecting rod and the fourth connecting rod; gears are connected to the output ends of both the first motor and the second motor.

[0014] The first, second, third, and fourth connecting rods are adjustable telescopic rods with a nut in the middle. The outer surface of the nut is provided with teeth. The gear of the first motor meshes with the teeth on the nut surface of the first and second connecting rods through a chain. The gear of the second motor meshes with the teeth on the nut surface of the second and fourth connecting rods through a chain.

[0015] The first arc-shaped track is located on one side of the first and second connecting rods, and the ends of the first and second connecting rods are mounted on the first arc-shaped track, moving in an arc along the first arc-shaped track; the second arc-shaped track is located on one side of the third and fourth connecting rods, and the ends of the third and fourth connecting rods are mounted on the second arc-shaped track, moving in an arc along the second arc-shaped track.

[0016] The first and second grading hoppers are respectively connected to the first and second arc-shaped tracks. The first and third connecting rods are hinged to the bottom of the first grading hopper, and the second and fourth connecting rods are hinged to the top of the second grading hopper.

[0017] Furthermore, the screening and conveying mechanism includes a vertical track and a first conveyor belt. The vertical track is fixed above the first grading hopper, and a first chute is provided on the side end of the first grading hopper. A top plate is fixed at the upper end of the vertical track, and electric telescopic rods are provided on both sides above the top plate. One end of the first conveyor belt is hinged in the first chute, and the other end is hinged on the vertical track. The telescopic end of the electric telescopic rod is hinged to the first conveyor belt through a hinge pin so that it is located on the vertical track.

[0018] Furthermore, the second grading hopper is provided with a second chute on its side end, and the second conveyor belt is connected to the second chute.

[0019] Furthermore, the end of the first grading hopper furthest from the side plate is the discharge end, and the discharge end is provided with a downward-facing inclined plate.

[0020] Furthermore, the end of the second grading hopper furthest from the side plate is the receiving end, and its position is adapted to that of the inclined plate.

[0021] Furthermore, both the first jigging mechanism and the second jigging mechanism include a third motor, and both the first grading hopper and the second grading hopper are provided with hopper liners. The hopper liners are connected to the inner wall of the hopper by springs. A half tooth is connected to the output end of the third motor, and a rack is meshed on the half tooth. The upper end of the rack contacts the bottom end of the hopper liner.

[0022] This invention discloses an automatic grading and coal preparation method based on wet separation, characterized in that the automatic grading and coal preparation method is performed based on the automatic grading and coal preparation equipment based on wet separation as described above;

[0023] The automatic coal grading and preparation method includes the following steps:

[0024] The coal and flocculant are mixed at the feed end and fed into the first grading hopper. The first jigging mechanism is activated to perform the first screening. After screening in the first grading hopper, the position of the first conveyor belt in the screening conveying mechanism is adjusted to pick up the coal suspended at the top and separate it. The coal remaining after the first screening is transferred to the second grading hopper through an inclined plate for screening again. The screened coal is then conveyed through the second conveyor belt.

[0025] During the screening process, the inclination of the first and second grading hoppers is adjusted by driving the flow rate adjustment mechanism to regulate the liquid flow rate.

[0026] Beneficial effects:

[0027] First, the automatic grading coal preparation equipment and coal preparation method based on wet separation of the present invention has designed a flow rate adjustment mechanism specifically for wet coal preparation equipment. The flow rate adjustment mechanism can not only adjust the inclination of the first grading hopper and the second grading hopper, thereby adjusting the flow rate of the suspension, but also increase the impact force of screening.

[0028] Secondly, the automatic grading coal preparation equipment and method based on wet separation of the present invention can separate the tail coal suspended at the top of the suspension by adjusting the position of the first conveyor belt, and the remaining coal enters the second grading hopper for further fine screening; the improved screening and conveying mechanism is more suitable for two-stage grading screening and can fully adapt to the flow speed of different suspensions. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the automatic grading and coal preparation equipment based on wet separation according to the present invention;

[0030] Figure 2 This is a state diagram of one of the automatic grading and coal preparation devices based on wet separation according to the present invention;

[0031] Figure 3 This is another state diagram of the automatic grading and coal preparation equipment based on wet separation according to the present invention;

[0032] Figure 4 This is a top view of the automatic grading and coal preparation equipment based on wet separation according to the present invention;

[0033] Figure 5 for Figure 4 AA section view;

[0034] Figure 6 for Figure 5 A magnified view of a portion at point C;

[0035] Figure 7 This is a schematic diagram of the flow rate regulating mechanism of the present invention;

[0036] Figure 8 for Figure 7 A magnified view of a portion at point D;

[0037] Figure 9 This is a flowchart of the coal preparation method of the automatic grading coal preparation equipment based on wet separation according to the present invention.

[0038] The attached figures are labeled as follows: 1. Base plate, 2. Side plate, 3. Telescopic push rod, 4. Arc-shaped track, 5. First motor, 6. First grading hopper, 7. Second grading hopper, 8. Vertical track, 9. Electric telescopic rod, 10. Top plate, 11. First chute, 12. Inclined plate, 13. First hinge plate, 14. Second hinge plate, 15. Third hinge plate, 16. Fourth hinge plate, 17. Receiving end, 18. Hopper liner, 19. Outer frame, 20. First conveyor belt, 21. Spring, 22. Third motor, 23. Half tooth, 24. Rack, 25. Fixing pin, 26. Connecting rod, 27. Nut, 28. Chain, 29. Gear, 30. Second chute, 31. Second conveyor belt. Detailed Implementation

[0039] The following embodiments are provided to enable those skilled in the art to more fully understand the present invention, but do not limit the invention in any way.

[0040] Please see Figure 1-9 This invention provides a technical solution: an automatic grading and coal preparation device based on wet separation, comprising a bottom plate 1, a side plate 2, two grading hoppers (a first grading hopper and a second grading hopper), two jigging mechanisms (a first jigging mechanism and a second jigging mechanism), a flow rate regulating mechanism, and a control chip. The side plate 2 is located on one side of the bottom plate 1.

[0041] To address the lack of multi-stage screening functionality, such as Figure 1-3As shown, the automatic grading and coal preparation equipment also includes a first grading hopper 6, a second grading hopper 7, and two sets of jigging mechanisms (first jigging mechanism and second jigging mechanism) capable of multi-stage screening; a first hinge plate 15 is provided on the bottom plate 1, and the second grading hopper 7 is hinged to the first hinge plate 15 via a fourth hinge plate 16 at its lower end, with the other end of the second grading hopper 7 extending into the middle gap of the side plate 2; a second hinge plate 14 is provided at the upper end of the second grading hopper 7, and a first hinge plate 13 is provided at the lower end of the first grading hopper 6, with the second hinge plate 14 hinged to the first hinge plate 13; each of the first grading hopper 6 and the second grading hopper 7 is provided with one set of the aforementioned jigging mechanism; as Figure 6 As shown, the jigging mechanism includes a third motor 22. The first grading hopper 6 and the second grading hopper 7 are both equipped with hopper liners 18. The hopper liners 18 are connected to the inner wall of the hopper by springs 21. A half tooth 23 is connected to the output end of the third motor 22. A rack 24 is meshed on the half tooth 23. The upper end of the rack 24 contacts the bottom end of the hopper liners 18.

[0042] This automatic grading and coal preparation equipment connects two sets of hoppers with adjustable tilt angles. The third motor 22 drives the half-tooth 23 to rotate, which in turn drives the rack 24 to move. The restoring force of the spring 21 drives the inner lining 18 of the hopper to move up and down for screening, forming a structure that can screen multiple times.

[0043] like Figure 7 As shown, to address the issue of adjusting the internal liquid flow rate, this automatic grading and coal preparation equipment also provides a flow rate adjustment mechanism for adjusting the tangential angle of the first grading hopper 6 and the second grading hopper 7. The flow rate adjustment mechanism is located in the side plate 2 and is connected to the first grading hopper 6 and the second grading hopper 7 respectively. The flow rate adjustment mechanism includes telescopic push rods 3, arc-shaped tracks 4, and outer frames 19. The two outer frames 19 are fixed to the ends of the two side plates 2 respectively and are used to fix the two telescopic push rods 3. Each outer frame 19 is used to fix one telescopic push rod 3. Two symmetrical connecting rods 26 are hinged to the telescopic ends of the two telescopic push rods 3. The two sets of arc-shaped tracks 4 are respectively located on one side of the two connecting rods 26 on the same side, and the ends of the connecting rods 26 can move in an arc along the arc-shaped tracks 4. The first grading hopper 6 and the second grading hopper 7 are connected to the arc-shaped tracks 4. The two connecting rods 26 at the upper end are hinged to the bottom end of the first grading hopper 6, and the two connecting rods 26 at the lower end are hinged to the upper end of the second grading hopper 7.

[0044] The flow rate adjustment mechanism pushes the connecting rod 26 through the telescopic push rod 3, which drives the first grading hopper 6 and the second grading hopper 7 to slide on the arc track, thereby realizing the function of adjusting the tilt angle.

[0045] The connecting rod 26 is an adjustable telescopic rod with a nut 27 in the middle; a motor 5 (the first motor and the second motor respectively) is fixed in the middle of the two connecting rods 26 pointing in the same direction, and a gear 29 is connected to the output end of the motor 5; the outer surface of the nut 27 is provided with teeth, and the gear 29 is driven by the chain 28 to mesh with the teeth on the surface of the two nuts 27 on the upper or lower side; when the motor 5 is driven, the length of the connecting rod 26 can be adjusted to achieve fine control of the tilt angle.

[0046] To separate and convey tailings, the automatic grading and coal preparation equipment has a screening and conveying mechanism at the upper end of the first grading hopper 6 for screening and conveying tailings; a second conveyor belt 31 is connected to the second grading hopper 7 via a second chute 30; the screening and conveying mechanism includes a vertical track 8 and a first conveyor belt 20. The vertical track 8 is fixed to the upper end of the first grading hopper 6, and a first chute 11 is provided on the side end of the first grading hopper 6; a top plate 10 is fixed to the upper end of the vertical track 8, and electric telescopic rods 9 are provided on both sides of the top plate 10. One end of the first conveyor belt 20 is hinged in the first chute 11, and the other end is hinged to the vertical track 8. The telescopic end of the electric telescopic rod 9 is hinged to the end of the first conveyor belt 20 located on the vertical track 8 via a hinge pin. The screening and conveying mechanism can adjust the tilt angle of the first conveyor belt 20 via the electric telescopic rod 9.

[0047] To achieve automatic grading, the automatic grading coal preparation equipment also includes a control chip, which is connected to the drive source of the flow rate adjustment mechanism, the jigging mechanism, and the screening and conveying mechanism.

[0048] To ensure smoother coordination between the two hoppers, an inclined plate 12 is provided at the discharge end of the first grading hopper 6; and a receiving end 17 is provided at one end of the second grading hopper 7, which is adapted to the position of the inclined plate 12.

[0049] See Figure 9 The present invention also discloses a coal preparation method applicable to an automatic grading and coal preparation equipment based on wet separation, the steps of which are:

[0050] s1, the coal and flotation liquid are mixed at the feed end and fed into the first grading hopper 6, and the first jigging mechanism is started for the first screening.

[0051] S2, after the coal and the flotation liquid are screened in the first grading hopper 6, the position of the conveyor belt 20 in the screening and conveying mechanism is adjusted to pick up the coal suspended at the top and convey it.

[0052] S3, the remaining coal after primary screening enters the second grading hopper 7 through inclined plate 12, the second jigging mechanism is started to further screen the coal, and then it is conveyed by conveyor belt 31.

[0053] s4, by driving the flow rate adjustment mechanism, adjusts the inclination of the first grading hopper 6 and the second grading hopper 7 to regulate the liquid flow rate.

[0054] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should be considered within the scope of protection of the present invention.

Claims

1. An automatic coal grading and preparation equipment based on wet separation, characterized in that, The automatic grading and coal preparation equipment includes a bottom plate, side plates, a first grading hopper, a second grading hopper, a first jigging mechanism, a second jigging mechanism, a flow rate regulating mechanism, and a control chip. The side plate is vertically mounted on one side of the base plate; the base plate is provided with a third hinge plate, one end of the second grading hopper is hinged to the third hinge plate via a fourth hinge plate at its lower end, and the other end of the second grading hopper extends into the middle gap of the side plate; the second grading hopper is located below the first grading hopper and its length is greater than that of the first grading hopper, and a second hinge plate is provided on its side, and a first hinge plate is provided on the side of the end of the first grading hopper away from the side plate, and the first hinge plate is hinged to the first hinge plate; a screening and conveying mechanism for screening and conveying tailings is provided above the first grading hopper, and the screening and conveying mechanism picks up the suspended coal in the first grading hopper according to the control instructions of the control chip and conveys it; The first jigging mechanism and the second jigging mechanism are respectively installed in the first grading hopper and the second grading hopper, and screen the coal and the liquid in the first grading hopper and the second grading hopper according to the control instructions of the control chip. The flow rate adjustment mechanism is installed inside the side plate and is connected to the first and second grading hoppers respectively. It adjusts the cutting angle of the first and second grading hoppers according to the control instructions of the control chip. The flow rate adjustment mechanism includes a first telescopic push rod, a second telescopic push rod, a first arc-shaped track, a second arc-shaped track, a first outer frame, and a second outer frame; The first outer frame and the second outer frame are respectively vertically fixed to both ends of the side plate for fixing the first telescopic push rod and the second push rod; the telescopic end of the first telescopic push rod is hinged with a first connecting rod and a second connecting rod, and the telescopic end of the second telescopic push rod is hinged with a third connecting rod and a fourth connecting rod; the first connecting rod and the third connecting rod point in the same direction and are symmetrical, the second connecting rod and the fourth connecting rod point in the same direction and are symmetrical, a first motor is fixed between the first connecting rod and the third connecting rod, and a second motor is fixed between the second connecting rod and the fourth connecting rod; gears are connected to the output ends of both the first motor and the second motor. The first, second, third, and fourth connecting rods are adjustable telescopic rods with a nut in the middle. The outer surface of the nut is provided with teeth. The gear of the first motor meshes with the teeth on the nut surface of the first and second connecting rods through a chain. The gear of the second motor meshes with the teeth on the nut surface of the second and fourth connecting rods through a chain. The first arc-shaped track is located on one side of the first and second connecting rods, and the ends of the first and second connecting rods are mounted on the first arc-shaped track, moving in an arc along the first arc-shaped track; the second arc-shaped track is located on one side of the third and fourth connecting rods, and the ends of the third and fourth connecting rods are mounted on the second arc-shaped track, moving in an arc along the second arc-shaped track. The first and second grading hoppers are respectively connected to the first and second arc-shaped tracks. The first and third connecting rods are hinged to the bottom of the first grading hopper, and the second and fourth connecting rods are hinged to the top of the second grading hopper.

2. The automatic grading and coal preparation equipment based on wet separation according to claim 1, characterized in that, The screening and conveying mechanism includes a vertical track and a first conveyor belt. The vertical track is fixed above the first grading hopper, and a first chute is provided on the side end of the first grading hopper. A top plate is fixed at the upper end of the vertical track, and electric telescopic rods are provided on both sides above the top plate. One end of the first conveyor belt is hinged in the first chute, and the other end is hinged on the vertical track. The telescopic end of the electric telescopic rod is hinged to the first conveyor belt through a hinge pin so that it is located on the vertical track.

3. The automatic grading and coal preparation equipment based on wet separation according to claim 2, characterized in that, The second grading hopper is provided with a second chute on its side end, and the second conveyor belt is connected to the second chute.

4. The automatic grading and coal preparation equipment based on wet separation according to claim 1, characterized in that, The end of the first grading hopper furthest from the side plate is the discharge end, which is provided with a downward-facing inclined plate.

5. The automatic grading and coal preparation equipment based on wet separation according to claim 4, characterized in that, The end of the second grading hopper furthest from the side plate is the receiving end, and its position is adapted to that of the inclined plate.

6. The automatic grading and coal preparation equipment based on wet separation according to claim 1, characterized in that, Both the first jigging mechanism and the second jigging mechanism include a third motor. Both the first grading hopper and the second grading hopper are provided with hopper liners. The hopper liners are connected to the inner wall of the hopper by springs. A half tooth is connected to the output end of the third motor, and a rack is meshed on the half tooth. The upper end of the rack contacts and connects to the bottom end of the hopper liner.

7. An automatic coal grading and preparation method based on wet separation, characterized in that, The automatic grading and coal preparation method is performed based on the automatic grading and coal preparation equipment based on wet separation as described in any one of claims 1-6; The automatic coal grading and preparation method includes the following steps: The coal and flocculant are mixed at the feed end and fed into the first grading hopper. The first jigging mechanism is activated to perform the first screening. After screening in the first grading hopper, the position of the first conveyor belt in the screening conveying mechanism is adjusted to pick up the coal suspended at the top and separate it. The coal remaining after the first screening is transferred to the second grading hopper through an inclined plate for screening again. The screened coal is then conveyed through the second conveyor belt. During the screening process, the inclination of the first and second grading hoppers is adjusted by driving the flow rate adjustment mechanism to regulate the liquid flow rate.

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