CN116060288B - Coal slime reduction device for coal preparation plant - Google Patents

Abstract

The present invention discloses a coal preparation plant coal slime reduction device, comprising a frame, a floating screen frame is arranged on the frame, a plurality of screening units are arranged on the frame, and the screening units include: a fixed beam, which is fixed on the frame at equal intervals; a floating beam, which is fixed on the floating screen frame at equal intervals, and the floating beam and the fixed beam are arranged alternately; an elastic screen, the two sides of which are respectively fixed on the fixed beam and the floating beam; and an adjustment mechanism, which is used to independently adjust the vibration range of each floating beam. The coal slime reduction device for a coal preparation plant provided by the present invention can independently adjust the floating beams of each screening unit by setting an adjustment mechanism to change the vibration range of each floating beam, and gradually adjust the vibration range of the floating beams of each screening unit, so that the vibration range of the upstream floating beam is offset to the side away from the adjacent fixed beam, and the vibration range of the downstream floating beam is offset to the side close to the adjacent fixed beam.

Description

Coal preparation plant coal slime reduction device

Technical Field

The invention relates to the technical field of coal preparation, and in particular to a coal slime reduction device in a coal preparation plant.

Background Art

The usual coal preparation process of a coal preparation plant is: 150-25mm lump coal is prepared by heavy medium shallow trough, 25-1.5mm fine coal is prepared by heavy medium cyclone, 1.5-0.15mm coarse coal is sorted by mud spiral sorter, and 0-0.15mm fine coal is recovered by mud filter press. In order to reduce the pressure on the coal preparation system, some coal preparation plants will directly process 0-25mm fine coal through a relaxation screen to reduce the amount of coal slime entering the coal preparation system.

For example, the patent with the authorization announcement number CN110064583B, the name of which is "A Nonlinear Vibration Relaxation Screen", and the authorization announcement date is August 4, 2020. It includes a screen body, a nonlinear spring device, a limit spring device, and a driving device. The nonlinear spring device is arranged between the main screen frame and the floating screen frame of the screen body and is detachably connected to the main screen frame and the floating screen frame. The limit spring device is detachably connected to the main screen frame and is located at the end of the floating screen frame. After the nonlinear spring device is installed on the main screen frame and the floating screen frame, the operating frequency domain of the nonlinear vibration relaxation screen is located in the nonlinear interval, and its amplitude is relatively stable and is less affected by external factors. The limit spring device controls the relative amplitude not to be too large, which greatly improves the life of the shear spring and the production efficiency of the entire device, while reducing its production cost.

The shortcoming of the prior art is that the flap screen includes multiple sieve plates connected in sequence. In the prior art, the vibration range of the multiple sieve plates is the same. In fact, due to the continuous screening, the composition of the materials on the upstream sieve plate and the downstream sieve plate has become different. The sieve plates with the same vibration range cannot better process materials with different compositions.

Summary of the invention

The object of the present invention is to provide a coal preparation plant coal slime reduction device to solve the above-mentioned deficiencies in the prior art.

In order to achieve the above object, the present invention provides the following technical solutions:

A coal slime reduction device for a coal preparation plant comprises a frame, a floating screen frame is arranged on the frame, a plurality of screening units are arranged on the frame, and the screening units comprise:

A fixed crossbeam fixed to the frame at equal distances;

Floating beams are fixed on the floating screen frame at equal distances, and the floating beams and the fixed beams are arranged alternately;

An elastic screen, two sides of which are respectively fixed on the fixed crossbeam and the floating crossbeam;

An adjustment mechanism is used to independently adjust the vibration range of each floating beam.

In the above-mentioned coal preparation plant coal slime reduction device, the floating crossbeam includes a first crossbeam and a second crossbeam, and the distance between the first crossbeam and the second crossbeam can be adjusted.

The above-mentioned coal slime reduction device of a coal preparation plant further includes a driving mechanism, which is used to drive the first crossbeam and the second crossbeam to move closer to or away from each other.

The above-mentioned coal preparation plant coal slime reduction device also includes a marking mechanism, which includes a pointer and a scale. The pointer is fixed on the first crossbeam. The floating screen frame is constructed with a through groove along its length direction. The pointer extends through the through groove to the outside of the floating screen frame. The scale is arranged along the length direction of the floating screen frame, and the pointer is located at the bottom of the scale.

In the above-mentioned coal slime reduction device of the coal preparation plant, the tops of the first crossbeam and the second crossbeam are both provided with connecting plates, and the connecting plates are used to connect the elastic screen.

In the above-mentioned coal preparation plant coal slime reduction device, the first crossbeam and the second crossbeam are both rotatably connected to the corresponding connecting plates via a connecting shaft.

In the above-mentioned coal preparation plant slime reduction device, a linkage mechanism is provided between the first crossbeam and the second crossbeam, which is used to drive the two connecting plates to rotate synchronously when the first crossbeam and the second crossbeam approach or move away from each other.

In the above-mentioned coal preparation plant coal slime reduction device, a flexible sealing member is fixed between the two connecting plates.

In the above-mentioned coal preparation plant coal slime reduction device, a cleaning roller is arranged on the side of the fixed crossbeam close to the elastic screen, and a power mechanism is arranged on the frame for driving the cleaning roller to move.

In the above-mentioned coal preparation plant coal slime reduction device, the side wall of the cleaning roller is constructed with an extrusion block adapted to the sieve holes of the elastic screen.

In the above technical scheme, the coal slime reduction device of the coal preparation plant provided by the present invention can independently adjust the floating beams of each screening unit by setting an adjustment mechanism to change the vibration range of each floating beam. For example, along the material movement direction, the vibration range of the floating beams of each screening unit is gradually adjusted, so that the vibration range of the upstream floating beam is offset to the side away from the adjacent fixed beam, which is convenient for quickly dispersing the material and screening the coal slime, and the downstream floating beam is offset to the side close to the adjacent fixed beam, which is convenient for carefully screening the fine coal, thereby improving the screening efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

FIG1 is a schematic diagram of the overall structure provided by an embodiment of the present invention;

FIG2 is an enlarged schematic diagram of point H in FIG1 provided by an embodiment of the present invention;

FIG3 is a top view provided by an embodiment of the present invention;

FIG4 is a cross-sectional view of A-A in FIG3 provided by an embodiment of the present invention;

FIG5 is a cross-sectional view B-B in FIG3 provided by an embodiment of the present invention;

FIG6 is an enlarged schematic diagram of point C in FIG4 provided by an embodiment of the present invention;

FIG7 is an enlarged schematic diagram of point D in FIG5 provided by an embodiment of the present invention;

FIG8 is an enlarged schematic diagram of point E in FIG5 provided by an embodiment of the present invention;

FIG9 is an enlarged schematic diagram of point P in FIG5 provided by an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of an adjustment mechanism provided in an embodiment of the present invention.

Description of reference numerals:

1. Frame; 2. Floating screen frame; 3. Fixed beam; 4. Floating beam; 4.1. First beam; 4.2. Second beam; 5. Elastic screen; 6. Marking mechanism; 7. Connecting plate; 8. Flexible seal; 9. Cleaning roller; 10. Moving block; 11. Inclined slot; 12. Slide rod; 13. Moving rod; 14. Threaded rod; 15. Linkage rod; 16. Transmission rod; 17. Drive rod; 18. Permanent magnet block; 19. Moving frame; 20. Articulated rod; 21. Arc rod; 22. Iron block; 23. Spring; 24.1. Wedge block; 24.2. Sleeve; 24.3. Trigger rod; 24.4. First connecting rod; 24.5. Second connection; 24.6. Slide; 24.7. Reset spring; 24.8. Extrusion block; 24.9. Trigger block.

DETAILED DESCRIPTION

In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

In each embodiment of the present invention, for the convenience of description but not limitation of rights, the length direction of the frame 1, that is, the direction of material movement, is called the first direction, that is, the direction of material movement is forward in the first direction, and the opposite is backward in the first direction. The width direction of the frame 1, that is, the length direction of the elastic screen 5, is called the second direction. The first direction and the second direction are perpendicular to each other, and the first direction, the second direction and the vertical direction constitute a three-dimensional coordinate system.

1-10, a coal preparation plant coal slime reduction device provided in an embodiment of the present invention comprises a frame 1, on which a floating screen frame 2 is provided, on which a plurality of screening units are provided, and the screening units comprise a plurality of fixed beams 3 and a plurality of floating beams 4, wherein the plurality of fixed beams 3 are equidistantly fixed on the frame 1; a plurality of floating beams 4 are equidistantly fixed on the floating screen frame 2, and the floating beams 4 are staggered with the fixed beams 3; an elastic screen 5, both sides of which are respectively fixed on the fixed beams 3 and the floating beams 4; and an adjusting mechanism for independently adjusting the vibration range of each of the floating beams 4.

Specifically, the coal slime reduction device of the coal preparation plant provided by the embodiment of the present invention is a relaxation screen. The relaxation screen refers to a screen whose screen body can be switched between at least two states of different tensioning degrees. The main body thereof is a frame 1, and the frame 1 is movably connected to a base such as a concrete base. The movable connection is generally connected through a shock-absorbing structure, so that the frame 1 can vibrate as a whole on the base. A floating screen frame 2 is arranged on the frame 1 along a first direction, and when the relaxation screen is working, the floating screen frame 2 is driven to reciprocate on the frame 1 along the first direction. A plurality of screening units are arranged on the frame 1, and the plurality of screening units are connected in sequence. The floating screen frame 2 is arranged tilted as a whole, and each screening unit is also arranged tilted, that is, one end is high and the other end is low, so that during the vibration process, the material will automatically roll from the higher end to the lower end, wherein a feed port is arranged at the screening unit at the higher end, and a discharge port is arranged at the screening unit at the lower end, and the base and the relaxation screen are connected by a shock-absorbing structure. Then, each screening unit includes a fixed beam 3, a floating beam 4 and an elastic screen 5 connecting the fixed beam 3 and the floating beam 4. A floating groove is also constructed on the frame 1 for the floating beam 4 to vibrate. When working, the frame 1 is driven by the vibration mechanism to drive the frame 1 to vibrate on the base. When the frame 1 vibrates, the fixed beam 3 moves together with the frame 1, and the floating screen frame 2 on the frame 1 will drive the floating beam 4 to vibrate in the floating groove. A shear spring is also arranged between the floating screen frame 2 and the frame 1, and the two ends of the shear spring are fixedly connected to the floating screen frame 2 and the frame 1 respectively. When the floating screen frame 2 vibrates along the floating groove, the floating screen frame 2 can be buffered by the shear spring, and the vibration range of the floating screen frame 2 can be limited. When the relaxation screen is working, the elastic screen 5 is driven by the vibration of the floating screen frame 2 to perform periodic tensioning and relaxation movements, so as to screen the material. This is the prior art and will not be repeated. In the relaxation screen, the vibration range of each floating beam 4 is generally fixed and the same. The innovation of this embodiment is that an adjustment mechanism is provided on the floating beam 4, through which the floating beam 4 of each screening unit can be independently adjusted to change the vibration range of each floating beam 4. For example, along the material movement direction, the vibration range of the floating beam 4 of each screening unit is gradually adjusted so that the vibration range of the upstream floating beam 4 is offset to the side away from the adjacent fixed beam 3, and the downstream floating beam 4 is offset to the side close to the adjacent fixed beam 3, that is, the upstream elastic screen 5 is tighter, and the downstream elastic screen 5 is looser. The advantage of such a design is that when the floating screen frame 2 vibrates, the upstream elastic screen 5 can obtain greater tension, can quickly disperse the material and quickly screen the fine coal slime, and the downstream elastic screen 5 obtains smaller tension, thereby reducing the speed of material movement to achieve a better screening effect, which is convenient for carefully screening the fine coal with a diameter slightly smaller than the screen hole, thereby improving the screening efficiency.

In another embodiment provided by the present invention, further, the floating beam 4 includes a first beam 4.1 and a second beam 4.2, and the distance between the first beam 4.1 and the second beam 4.2 can be adjusted. Specifically, the floating beam 4 provided in this embodiment is divided into a first beam 4.1 and a second beam 4.2, and the two elastic screens 5 on both sides are respectively connected by the first beam 4.1 and the second beam 4.2, and the distance between the first beam 4.1 and the second beam 4.2 can be adjusted. The advantage is that when the distance between the first beam 4.1 and the second beam 4.2 becomes larger, the distance between the first beam 4.1 and an adjacent fixed beam 3 The distance between the first beam 4.1 and the adjacent fixed beam 3 also becomes smaller (that is, the elastic screen 5 connected to the first beam 4.1 and the adjacent fixed beam 3 becomes looser), and the distance between the second beam 4.2 and the adjacent fixed beam 3 also becomes smaller. At this time, the vibration range of the first beam 4.1 and the second beam 4.2 is offset to the side close to the adjacent fixed beam 3. Conversely, when the distance between the first beam 4.1 and the beam becomes smaller, the vibration range of the first beam 4.1 and the second beam 4.2 is offset to the side away from the adjacent fixed beam 3. With this design, the floating beam 4 of each screening unit can be adjusted according to different working conditions to adapt to different working conditions and achieve better screening effect.

Furthermore, it also includes a driving mechanism, which is used to drive the first crossbeam 4.1 and the second crossbeam 4.2 to move closer to or away from each other. Specifically, the driving mechanism is preferably a combination of a moving block 10 and an inclined slot 11. A moving slot is configured on the floating screen frame 2. The first crossbeam 4.1 and the second crossbeam 4.2 are both arranged in the moving slot. A sliding rod 12 is fixed to the inner wall of the moving slot along a first direction, and the sliding rod 12 movably passes through the first crossbeam 4.1 and the second crossbeam 4.2. The first crossbeam 4.1 and the second crossbeam 4.2 are both configured with The inclined groove 11, the bottom of the moving block 10 is symmetrically fixed with two moving rods 13 adapted to the inclined groove 11, and the two moving rods 13 are respectively inserted in the two inclined grooves 11. The moving rods 13 can be driven to move by driving the moving block 10 to move. When the moving rods 13 move, they will contact the inner wall of the inclined groove 11, thereby driving the first beam 4.1 and the second beam 4.2 to move closer to or away from each other along the sliding rod 12 in the first direction. Since this driving method is relatively delicate, a threaded rod 14 structure can be set to connect the moving block 10. Specifically, , the threaded rod 14 is arranged along the second direction, the threaded rod 14 is connected to the floating screen frame 2 through a bearing (that is, the threaded rod 14 and the floating screen frame 2 can rotate relative to each other, but cannot move relative to each other along the second direction), and the threaded rod 14 is threadedly connected to the moving block 10, and the inner wall of the moving groove is constructed with a groove body for the moving block 10 to move along the second direction, so that when the threaded rod 14 rotates, the moving block 10 is driven to move along the groove body, thereby driving the two moving rods to resist the inner wall of the inclined groove 11, and then driving the first beam 4.1 and the second beam 4.2 to adjust the distance in the first direction. The advantage of such a design is that by rotating a threaded rod to drive the moving block 10 to synchronously adjust the positions of the first beam 4.1 and the second beam 4.2 (that is, the distance between the first beam 4.1 and the adjacent fixed beam 3 and the distance between the second beam 4.2 and the adjacent fixed beam 3 are synchronously adjusted), so that the tensioning degree of the two elastic screens 5 connected to a floating beam 4 is basically the same, and both can achieve the effect of quickly dispersing materials or carefully screening materials.

Furthermore, it also includes a marking mechanism 6, which includes a pointer 6.1 and a scale 6.2, the pointer 6.1 is fixed on the first crossbeam 4.1, the floating screen frame 2 is configured with a through slot along its length direction, the pointer 6.1 extends through the through slot to the outside of the floating screen frame 2, the scale 6.2 is arranged along the length direction of the floating screen frame 2, and the pointer 6.1 is located at the bottom of the scale 6.2. Specifically, since the distance between the first crossbeam 4.1 and the adjacent fixed crossbeam 3 and the distance between the second crossbeam 4.2 and the adjacent fixed crossbeam 3 are synchronously adjusted, only one marking mechanism 6 is arranged at one floating crossbeam 4, When the first beam 4.1 and the second beam 4.2 are fitted together, the scale 6.2 corresponding to the pointer 6.1 is zero. When the position of the first beam 4.1 changes, the corresponding value can be read out through the scale 6.2 (the read value is half of the distance between the first beam 4.1 and the second beam 4.2). The advantage of this design is that the floating beam 4 is located inside the frame 1 and cannot be directly observed by the naked eye. Through the combination of the pointer 6.1 and the scale 6.2, the distance between the first beam 4.1 and the second beam 4.2 can be intuitively seen from the outside, thereby realizing the control of the vibration range of each screening unit and facilitating the operation of the staff.

In another embodiment provided by the present invention, a connecting plate 7 is provided on the top of the first crossbeam 4.1 and the second crossbeam 4.2, and the connecting plate 7 is used to connect the elastic screen 5. Specifically, the connection method between the connecting plate 7 and the elastic screen 5 is preferably a bolt connection. When the elastic screen 5 needs to be replaced, the elastic screen 5 is removed from the corresponding connecting plate 7, and then the elastic screen 5 is removed from the corresponding fixed crossbeam 3. The advantages of such a design are, firstly, it is convenient to replace the elastic screen 5 when it is worn, and on the other hand, the elastic screen 5 with different screen hole diameters can be replaced as needed to improve the application range of the device.

Furthermore, a flexible seal 8 is fixed between the two connecting plates 7. Specifically, when the first crossbeam 4.1 and the second crossbeam 4.2 are separated, the flexible seal 8 can prevent the material from entering between the first crossbeam 4.1 and the second crossbeam 4.2, and prevent the material from moving to the bottom of the elastic screen 5 without being screened. The flexible seal 8 is preferably a telescopic cloth, which can prevent the material from entering between the first crossbeam 4.1 and the second crossbeam 4.2, and can adapt to the movement of the two connecting plates 7. There are two ways to install the flexible seal 8. One is that the flexible seal 8 is installed between the two connecting plates 7, and the two sides of the flexible seal 8 are respectively fixed on the two connecting plates 7 (not shown). The flexible seal 8 can The above purpose can be achieved. Secondly, the flexible seal 8 is installed above the two elastic screens 5. Preferably, mounting holes are equidistantly constructed on both sides of the flexible seal 8. When the elastic screen 5 is fixed to the connecting plate 7 by bolts, the flexible seal 8 is placed between the bolts and the elastic screen 5 to install the flexible seal 8. Compared with the first installation method, the advantage of this installation method is that it can not only prevent materials from entering between the first beam 4.1 and the second beam 4.2, but also effectively prevent materials from entering between the two elastic screens 5 or the two connecting plates 7, thereby avoiding the adhesion of materials to hinder the operation of the linkage mechanism when the two connecting plates 7 or the two elastic screens 5 approach the floating beam 4.

In another embodiment provided by the present invention, further, a cleaning roller 9 is provided on one side of the fixed crossbeam 3 close to the elastic screen 5, and the two cleaning rollers 9 are disposed at opposite ends of the fixed crossbeam 3. A power mechanism is provided on the frame 1, which is used to drive the cleaning roller 9 to move. Specifically, the power mechanism is preferably a combination of a driving rod 17 and a driving member. The driving rod 17 is slidably connected to the frame 1 along a first direction. The driving member can be a cylinder (not shown). One end of the driving rod 17 is fixed to the telescopic end of the cylinder. The driving rod 17 can be driven by the cylinder to slide on the frame 1 along the first direction. A driving rod 17 is fixed at a position corresponding to the fixed crossbeam 3 on the driving rod 17. A plurality of permanent magnet blocks 18 are provided, and an interlocking groove is configured on one side of the fixed crossbeam 3 close to the elastic screen 5, and the cleaning roller 9 is embedded in the corresponding interlocking groove. A mobile frame 19 is slidably connected in the frame 1 along a first direction, and both ends of the cleaning roller 9 are rotatably connected to the mobile frame 19 through a connecting shaft. The position corresponding to the permanent magnet block 18 at the bottom of the mobile frame 19 is made of iron material. Such a configuration enables the driving rod 17 to have three states. First, at the beginning, the cleaning roller 9 is not located in the interlocking groove, the driving rod 17 is stationary at the original position, and the permanent magnet block 18 is located directly below the fixed crossbeam 3. Since the bottom of the mobile frame 19 is made of iron material, when the permanent magnet block 18 is not in contact with the mobile frame 19 In this case, the magnetic force of the permanent magnet block 18 can attract the movable frame 19 to approach one side of the permanent magnet block 18, so that the cleaning roller 9 is embedded in the fitting groove. Secondly, the driving rod 17 moves forward or backward along the first direction. When the driving rod 17 moves, it drives multiple permanent magnet blocks 18 to move forward or backward synchronously. When the permanent magnet block 18 moves, it first fits with the corresponding movable frame 19 (that is, the movable frame 19 of each fixed beam 3 on the front side or the rear side in the first direction), and then the movable frame 19 and the permanent magnet block 18 are adsorbed together and move forward or backward synchronously, thereby driving the corresponding cleaning roller 9 to move and clean the elastic screen 5. Thirdly, the driving rod 17 is reset to its original position. The driving rod 17 is set, under the magnetic attraction of the moving frame 19 by the driving rod 17, the resetting of the driving rod 17 will drive the moving frame 19 to move synchronously, and after the cleaning roller 9 moves to the fitting groove, the permanent magnet block 18 continues to move and disengages from the moving frame 19, and the magnetic attraction is always maintained when the two are disengaged. The effect of such a setting is that the permanent magnet block 18 is set at the position corresponding to the fixed crossbeam 3 on the driving rod 17, and the two cleaning rollers 9 can be driven alternately by one permanent magnet block 18, so that the cleaning rollers 9 can be driven to remove impurities such as coal slime adhering to the elastic screen 5 by the movement of the driving rod 17, so as to prevent the impurities such as coal slime adhering to the screen hole from affecting the filtering range of the elastic screen 5. The magnetic mechanism is set so that one driving rod 17 can drive two cleaning rollers 9 alternately.

Furthermore, an open cavity is constructed in the fixed crossbeam 3, and the open cavity is connected to the fitting groove. A hinged rod 20 is hinged on one side of the corresponding cleaning roller 9 in the open cavity. An arc rod 21 adapted to the connecting shaft at the end of the cleaning roller 9 is fixed to the top of the hinged rod 20. An iron block 22 is fixed to the bottom of the hinged rod 20. A spring 23 is fixed on one side of the hinged rod 20 close to the iron block 22, and the other end of the spring 23 is fixed on the inner wall of the open cavity. Specifically, the hinged rod 20 has three states as the permanent magnet block 18 moves. State, first, when the permanent magnet block 18 is located directly below the fixed crossbeam 3, under the elastic force of the spring 23 and the magnetic attraction of the permanent magnet block 18 to the iron block 22, the hinged rod 20 rotates around its hinge point (that is, the hinge point of the hinged rod 20 and the open cavity) to the position where the arc rod 21 fits the connecting shaft. At this time, the connecting shaft can be fixed by the arc rod 21, further limiting the relative position of the cleaning roller 9 and the fitting groove. Second, when the permanent magnet block 18 moves forward or backward along the first direction with the driving rod 17 , the permanent magnet block 18 moves and drives the iron block 22 on the corresponding side (that is, the iron block 22 on the front side or the rear side of the open cavity in the first direction) to move in the open cavity through magnetic force, so that the hinge rod 20 rotates with the iron block 22 and squeezes the spring 23. When the permanent magnet block 18 moves to a position that fits the moving frame 19, the hinge rod 20 rotates to a position where the arc rod 21 is separated from the connecting shaft. At this time, the permanent magnet block can drive the corresponding moving frame 19 to move, and the iron block 22 loses the permanent magnet block 18. The magnetic force will be reset under the elastic force of the spring 23. Thirdly, when the permanent magnet block 18 is reset to the original position with the driving rod 17, when the permanent magnet block 18 drives the cleaning roller 9 to be embedded in the fitting groove, the permanent magnet block 18 attracts the corresponding iron block 22 through magnetic force and moves the corresponding iron block 22 to the side close to the permanent magnet block 18, thereby driving the hinged rod 20 to squeeze the spring 23 to rotate. At this time, the arc rod 21 will not block the connecting shaft of the cleaning roller 9, so that the cleaning roller 9 is reset to the corresponding fitting groove. The advantage of such a design is that, in multiple screening units, only one side of the fixed beam 3 located at the edge is connected to the elastic screen 5, and except for the two fixed beams 3 at the edge, the remaining multiple fixed beams 3 are connected to two elastic screens 5. When the driving rod 17 moves forward or backward along the first direction, it can drive the moving frame 19 and the cleaning roller 9 on the front side or the rear side in the first direction to move, so as to complete the cleaning of the elastic screen 5 on the front side or the rear side in the first direction. When the permanent magnet block 18 is away from the fixed beam 3, the position of the hinged rod 20 on the other side of the fixed beam 3 does not change under the elastic force of the corresponding spring 23, so that the arc rod 21 on the other side of the fixed beam 3 maintains a restrictive effect on the corresponding cleaning roller 9, thereby increasing the stability of the cleaning roller 9, so that the cylinder can drive the driving rod 17 to reciprocate along the first direction to drive different cleaning rollers 9 to move alternately, thereby comprehensively cleaning the elastic screen 5.

Furthermore, a trigger mechanism is provided in the frame 1. When the driving rod 17 moves forward along the first direction, the trigger mechanism is started and drives the floating screen frame 2 to move to the frontmost side of its stroke (that is, the frontmost side of the floating screen frame 2 in the first direction stroke). Conversely, when the driving rod 17 moves backward along the first direction, the trigger mechanism is started and drives the floating screen frame 2 to move to the rearmost side of its stroke. Specifically, two sets of trigger mechanisms are symmetrically provided on both sides of the driving rod 17. The trigger mechanism includes a wedge block 24.1 fixed to the bottom of the driving rod 17, a connecting block 24.2 is fixed to the inner wall of the frame 1, and a trigger rod 24.3 is slidably connected to the connecting block 24.2. A first connecting rod 24.4 is rotatably connected to the inner wall of the frame 1, and rollers are installed at the upper and lower opposite ends of the trigger rod 24.3. The roller at the top of the trigger rod 24.3 is rotatably connected to the wedge block 24.1 and the bottom of the driving rod 17, and the roller at the bottom of the trigger rod 24.3 contacts the first connecting rod 24.4, and the first connecting rod 24.4 is away from the trigger One end of the trigger rod 24.3 is hinged with a second connection 24.5, the inner wall of the frame 1 is configured with a slide groove 24.6 along the first direction, a slider is slidably connected in the slide groove 24.6, a return spring 24.7 is arranged in the slide groove 24.6, and the two ends of the return spring 24.7 are respectively fixed on the inner wall of the slide groove 24.6 and the slider, and an extrusion block 24.8 is also fixed on the slider, the extrusion block 24.8 is located outside the slide groove 24.6 and the extrusion block 24.8 is hinged with the second connection rod 24.5, and the trigger mechanism also includes The trigger block 24.9 is fixed on the floating screen frame 2 (that is, the trigger block can vibrate along the first direction together with the floating screen frame), the trigger block 24.9 extends into the frame 1 and corresponds to the position of the extrusion block 24.8. Preferably, the two wedge blocks 24.1 in the two groups of trigger mechanisms are respectively located on the sides of the two trigger blocks 24.9 facing away from each other, the wedge blocks 24.1 have a straight portion and an inclined portion, and the inclined portions of the two wedge blocks 24.1 are both located on the side close to the trigger block 24.9. The effect of such arrangement is that, firstly, when the driving rod 17 is stationary, the positions of the trigger rod 24.3 and the extrusion block 24.8 are fixed relative to the frame 1, so that the trigger block 24.9 can vibrate normally with the floating screen frame 2; secondly, when the driving rod 17 moves forward or backward along the first direction and drives the corresponding cleaning roller 9 to move, the wedge block 24.1 on the rear side or the front side of the driving rod 17 in the first direction can force the trigger rod 24.3 to move downward along the sleeve 24.2 with the roller through the inclined portion, so that the roller at the bottom of the trigger rod 24.3 resists the rotation of the first connecting rod 24.4 (that is, the first connecting rod 24.4 rotates around its rotation connection point with the frame 1). When the first connecting rod 24.4 rotates, its end close to the slider moves upward and drives the slider to move along the slide groove 24.6 through the second connecting rod 24.5. When the return spring 24.7 is squeezed, the squeeze block 24.8 is driven to move toward the trigger block 24.9 side, thereby pushing the trigger block 24.9 to the front end or the rear end of its stroke through the squeeze block 24.8 (that is, the trigger block 24.9 and the floating screen frame 2 are both at the front end or the rear end of their stroke), and then the driving rod 17 continues to move, and the straight portion of the wedge block 24.1 continues to contact the roller on the sleeve 24.2, so that the positions of the trigger rod 24.3 and the squeeze block 24.8 remain unchanged, thereby keeping the trigger block 24.9 and the floating screen frame 2 at the front end or the rear end of their stroke; thirdly, when the driving rod 17 is reset along the first direction, contrary to the above-mentioned second situation, when the wedge block 24.1 is reset to the position where the inclined portion contacts the roller, the trigger rod 24.3 and the slider will be reset under the elastic force of the return spring 24.7. The advantage of such a configuration is that when the driving rod 17 moves in the first direction and drives the cleaning roller 9 to clean the elastic screen 5, the driving rod 17 first moves a distance (that is, a distance that the inclined portion of the wedge block 24.1 contacts the roller). During this process, the permanent magnet block 18 has not yet fitted with the movable frame 19 (that is, the cleaning roller 9 has not moved). At the same time, the extrusion block 24.8 pushes the trigger block 24.9 to the end of its stroke, and the trigger block 24.9 drives the floating screen frame 2 and the floating crossbeam 4 to move to the ends of their respective strokes, thereby driving the elastic screen 5 on one side of the floating screen frame 2 to be tensioned, so that the elastic screen 5 is in a state close to the plane. The straight state has the effect that, during the process of the driving rod 17 driving the permanent magnet block 18 to fit with the movable frame 19, the trigger mechanism synchronously drives the floating screen frame 2 to move to the end of its stroke to tension the corresponding elastic screen 5. During the subsequent movement of the cleaning roller 9 (that is, the straight portion of the wedge block 24.1 contacts the roller for a distance), the elastic screen 5 can be cleaned more comprehensively, thereby improving the cleaning efficiency of the cleaning roller 9. When the cleaning roller 9 is reset, the elastic screen 5 is always in a tensioned state until the extrusion block 24.8 no longer contacts the trigger block 24.9 (that is, the permanent magnet block 18 is separated from the movable frame 19).

Preferably, the driving rod 17 can reciprocate in the first direction under the action of the driving member. The driving rod 17 first moves forward in the first direction, driving the floating beam 4 and the cleaning roller 9 to move forward in the first direction, and the elastic screen 5 on the rear side of the floating beam 4 in the first direction is tensioned, thereby cleaning part of the elastic screen 5, and then the driving rod 17 resets backward in the first direction and continues to move backward, thereby cleaning another part of the elastic screen 5. With this design, the driving rod 17 can continue to reciprocate and comprehensively clean the elastic screen 5.

Preferably, before the elastic screen 5 is cleaned by the cleaning roller 9, the first crossbeam 4.1 and the second crossbeam 4.2 are driven closer to each other by the driving mechanism, so that when the floating screen frame 2 moves to one end of its stroke, the floating crossbeam 4 can tighten the elastic screen 5, thereby further improving the cleaning effect of the cleaning roller 9.

In another embodiment provided by the present invention, the side wall of the cleaning roller 9 is constructed with an extrusion block adapted to the sieve holes of the elastic screen 5. Specifically, the extrusion blocks on the axial side wall of the cleaning roller 9 correspond to the sieve holes of the elastic screen 5 in sequence. When the elastic screen 5 is tensioned and cleaned by the cleaning roller 9, the several extrusion blocks constructed on the axial side wall of the cleaning roller 9 will most likely be embedded in the sieve holes of the elastic screen 5 in sequence. The advantage of such a design is that the sieve holes can be deeply cleaned by the extrusion blocks, and due to the different structures of the coal block surfaces, some coal blocks will be stuck in the sieve holes and cannot be discharged with the vibration of the elastic screen 5. At this time, the coal blocks stuck in the sieve holes can be cleared by the extrusion blocks, thereby preventing the coal blocks stuck in the sieve holes from causing continuous damage to the elastic screen 5.

The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims (6)

1. Coal slime reduction device of coal preparation factory, including the frame, its characterized in that, be provided with the frame that floats in the frame, be provided with a plurality of screening units in the frame, the screening unit includes:

the fixed cross beams are fixed on the frame at equal intervals;

the floating cross beams are fixed on the floating screen frame at equal intervals and are staggered with the fixed cross beams;

the two sides of the elastic screen are respectively fixed on the fixed cross beam and the floating cross beam;

an adjusting mechanism for independently adjusting a vibration range of each of the floating beams;

The floating cross beam comprises a first cross beam and a second cross beam, and the distance between the first cross beam and the second cross beam can be adjusted;

The driving mechanism is used for driving the first beam and the second beam to be close to or far away from each other;

The driving mechanism comprises a moving block and a chute, a moving groove is formed in the floating screen frame, a first cross beam and a second cross beam are both arranged in the moving groove, a sliding rod is fixed on the inner wall of the moving groove, the sliding rod penetrates through the first cross beam and the second cross beam in a movable mode, the chute is formed in each of the first cross beam and the second cross beam, two moving rods matched with the chute are symmetrically fixed at the bottom of the moving block, and the two moving rods are respectively inserted into the two chute; the movable block is connected with the movable block through a bearing, and the movable block is connected with the movable block through a bearing.

2. The coal yard slime reduction device according to claim 1, further comprising a marking mechanism including a pointer and a scale, wherein the pointer is fixed on the first cross beam, the floating screen frame is configured with a through slot along a length direction thereof, the pointer extends out of the floating screen frame through the through slot, the scale is arranged along the length direction of the floating screen frame, and the pointer is located at the bottom of the scale.

3. The coal preparation plant slime reduction device according to any one of claims 1-2, wherein the first beam and the second beam are each provided with a connection plate at the top, the connection plates being used for connecting an elastic screen.

4. A coal preparation plant slime reduction device according to claim 3, characterized in that a flexible sealing member is fixed between the two connection plates.

5. The coal slime reduction device of the coal preparation plant according to claim 1, wherein a cleaning roller is arranged on one side of the fixed cross beam, which is close to the elastic screen, and a power mechanism is arranged on the frame and used for driving the cleaning roller to move.

6. The coal preparation plant slime reduction device of claim 5, wherein the cleaning roller side wall is configured with squeeze blocks adapted to the mesh holes of the elastic screen.