Coal mine transportation screening device and use method

Abstract

The present application relates to the technical field of coal mine screening, in particular to a coal mine transportation screening device and a use method thereof, comprising a rack, a vibrating seat and a screen frame, the present application can increase the moving stroke of the unit volume of coal ore in the limited space through the reciprocating deflection and horizontal swing of the screen frame, improve the screening rate and effective screening amount, through frequent multi-layer overturning of the coal ore during the screening process, the screening rate can be improved, and the probability of decomposition and crushing of the bottom layer of coal ore due to repeated friction of the screen frame can be reduced, through the screen mesh independently set by multiple stations, the cleaning, maintenance and replacement rate in the later stage can be improved, and the screen mesh inclination angle can be changed to adapt to the particle diameter of the screened coal ore, further adapt to different scene requirements of the coal ore screening, different from the existing linear and drum type screening equipment, and cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine screening, and particularly relates to a coal mine conveying and screening device and a use method thereof. BACKGROUND

[0002] A coal mine is a region where coal resources are mined in a coal-rich mining area, and is generally divided into underground coal mines and open-pit coal mines. A coal mine is a reasonable space dug by humans in a geological layer rich in coal, and usually includes roadways, shafts, and mining faces. Coal is the most important solid fuel and is a kind of combustible organic rock. It is formed from lush plants grown in a certain geological era, which are gradually accumulated into thick layers in suitable geological environments, and are buried in water or silt. After a long period of geological time, natural coalification occurs to form coal. The carbon content of coal is generally 46-97%, and coal is brown to black, with a dull to metallic luster. According to the degree of coalification, coal can be divided into peat, lignite, bituminous coal, and anthracite.

[0003] In the process of coal mining and transportation, coal needs to be screened. Coal screening refers to the classification of raw coal into finished coal of appropriate particle size. After screening, coal of different particle sizes can be transported to the required use site, improving the utilization rate and use site of coal.

[0004] For the coal screening equipment in the prior art, the screening method can be by a drum-type screening or a straight-line screening. The straight-line screening: the existing straight-line vibrating screening equipment often adopts multi-layer screening. After uniform loading, the coal is dropped from top to bottom and is screened layer by layer by screens of different sizes. The drum-type screening: the coal is loaded into the drum-type screening screen, and different diameters of the drum screen are changed to screen coal of multiple particle sizes. However, in the actual operation of the coal screening equipment, it is found that the straight-line screening method: after the multi-layer screening is adopted, the screening stroke of the single layer screen is short. When the coal is uniformly loaded from the upper layer, the coal in the accumulation state often cannot be fully screened and falls from the bottom of the vibrating screen. There is a phenomenon of mutual mixing of coal between the multi-layer vibrating screens, the screening efficiency is low, and the screening is not complete. The drum-type screening method: although the loaded coal can be fully turned and screened in the drum, with the rotation of the drum, the coal is accumulated in a concentrated manner and the probability of mutual extrusion increases. The collision frequency between the coal and the drum and between the coal and the coal increases, which increases the probability of self-decomposition and fragmentation of the coal, thereby reducing the effective extraction and utilization rate of the coal.

[0005] Based on this, the present application designs a coal mine conveying and screening device and a use method to solve the above technical problems. SUMMARY

[0006] The coal mine transportation screening device is used to solve the problem of incomplete screening caused by the cross mixing of coal mine stones with different particle sizes, large self-cracking probability of the coal mine stones, and low effective extraction and utilization rate of the coal mine stones.

[0007] The coal mine transportation screening device comprises a rack, a vibrating seat and a screen frame, the bottom of the rack is detachably provided with the vibrating seat around, the inner side of the rack is detachably provided with the screen frame, the rack is in a "convex" shape, the bottom of the rack is symmetrically provided with a through slot, a receiving hopper is slidably arranged in the slot, the top of the rack is provided with a feeding port, and the screen frame is located between the receiving hopper and the feeding port.

[0008] The screen frame is a quadrilateral frame structure, a gap is reserved between the side of the screen frame and the inner wall of the rack, and an elastic material is attached to the side of the screen frame to fill the gap.

[0009] A horizontal plate is arranged in the middle of the quadrilateral structure of the screen frame, a polygonal embedded groove is fixedly arranged on the side of the horizontal plate, a driving shaft is arranged on the side wall of the rack through a bearing, and a polygonal section is arranged on one end of the driving shaft and slidably connected with the embedded groove.

[0010] A partition plate is arranged on both sides of the horizontal plate and parallel to the horizontal plate.

[0011] A plurality of dust removal rods are evenly arranged on the inner side of the screen frame, the plurality of dust removal rods are arranged at equal intervals, the middle part of the dust removal rod is a hollow structure, and the side wall of the dust removal rod is provided with a gas hole connected with the inner hollow cavity.

[0012] A screen is a meshed porous material, the screen is arranged between two adjacent dust removal rods, a plurality of screens are arranged on both sides of the partition plate, a plug-in rod is fixedly arranged on the middle part of both ends of the screen, and the end part of the plurality of plug-in rods is plug-in connected with the side of the screen frame, the partition plate and the horizontal plate through a rotating fit mode.

[0013] A deflection plate is vertically arranged on both ends of the screen frame, the distance between the upper and lower ends of the deflection plate is greater than the thickness of the screen frame, a torsion spring is connected between the deflection plate and the screen frame, and the deflection plate is in sliding contact with the inner wall of the rack.

[0014] Preferably, a plurality of deceleration grooves are evenly arranged in the middle part of the partition plate, the plurality of deceleration grooves are left-right staggered and close to the screens on both sides of the partition plate, a deceleration plate is arranged in the deceleration groove through a rotating fit mode, a torsion spring is connected between the deceleration plate and the partition plate, an inclined surface opposite to the direction of the screen is arranged on the upper part of the deceleration plate, and a traction ball is connected with the lower part of the deceleration plate through a traction rope.

[0015] Preferably, both ends of the partition plate are provided with a rocking shaft through bearings, the rocking shaft is parallel to the central axis of the dust removal rod, and the inner wall of the rack near the rocking shaft is uniformly provided with convex balls from top to bottom.

[0016] Preferably, both sides of the screen are fixedly provided with a fan-shaped strip, the linear distance between the two ends of the arc surface of the fan-shaped strip is greater than the diameter of the dust removal rod, the arc surface of the fan-shaped strip is in sliding contact with the outer wall of the dust removal rod, the side wall near the side of the dust removal rod is uniformly provided with a groove, and the air holes are arranged in the groove and the exhaust direction of the air holes points to the arc surface of the fan-shaped strip.

[0017] Preferably, the two side walls of the rack are symmetrically provided with a brake ring, the driving shaft penetrates the central axis of the brake ring, the lower part of the brake ring is fixedly provided with a baffle, the baffle is below the horizontal plate and does not contact the horizontal plate, the middle part of the brake ring is provided with an arc-shaped notch with an acute angle between the two ends, the screen frame is located between the arc-shaped notches and the side wall of the screen frame is in abutting contact with the two ends of the arc-shaped notch of the brake ring.

[0018] Preferably, the lower part of the baffle is fixedly provided with an air bag made of elastic material, the middle cavities of the plurality of dust removal rods are communicated with the air bag through air pipes, the two side walls of the rack are fixedly provided with one-way air inlet valves, and the one-way air inlet valves are respectively communicated with the two ends of the air bag, the two sides of the horizontal plate are fixedly provided with extrusion claws, the lower part of the extrusion claw is arc-shaped, and the lower parts of the plurality of extrusion claws are respectively abutted on the two side walls of the air bag.

[0019] Preferably, one end of the driving shaft is exposed outside the rack, a driving gear is fixedly installed at the exposed end of the driving shaft, a fixed disc is fixedly installed through the side wall of the rack, a clamping claw is fixedly inserted at one end of the fixed disc, a driving rack is slidably installed on the clamping claw, the driving rack is obliquely installed and engaged with the driving gear, a hydraulic cylinder is fixedly installed on the outer wall of the rack, and the output shaft of the hydraulic cylinder is connected with the driving rack.

[0020] Preferably, the top of the rack is provided with a blanking plate symmetrically installed on both sides, the blanking plate is an inclined "L" shaped structure, the lower part of the blanking plate is provided with a bending arc surface matched with the outer wall of the fixed disc, the screen frame is below the blanking plate, and a gap for the coal mine to pass through is reserved between the lower end of the blanking plate and the screen frame.

[0021] Preferably, the upper part of the left and right sides of the rack is detachably mounted with a dust cover, a winding shaft is mounted on the fixed disc through a bearing, a filter cloth is wound on the winding shaft, the filter cloth is located above the screen frame, and the end of the filter cloth is fixedly connected with the dust cover, the top of the rack is uniformly provided with a poking rod through rotating cooperation at the position of the feeding port, the poking rod is located above the dropping plate and extends to the middle part of the base frame, a torsional spring is connected between the poking rod and the rack, and the poking rod is horizontally placed in a natural state.

[0022] In addition, the application also provides a use method of the coal mine transportation and screening device.

[0023] S1, operation inspection: first, the whole screening device is placed in the working site by the staff, and the horizontal degree is adjusted, then, the two receiving hoppers are respectively slidably installed into the through grooves on the left and right sides of the rack, and then, the vibration seat is started to make the whole screening device vibrate;

[0024] S2, coal mine stone filling: the coal mine stone to be screened is filled into the feeding port at the top of the rack by the staff or the existing conveying equipment, then, under the action of gravity, the coal mine stone freely falls and reaches the screen frame;

[0025] S3, screening treatment: the coal mine stone is subjected to multi-stage screening treatment by the screen in the middle part of the screen frame, and the coal mine stone with a diameter smaller than the target diameter is dropped into the receiving hopper below in batches;

[0026] S4, discharge and collection: the receiving hopper is taken out and replaced by the staff or the existing traction equipment until the screening of the coal mine stone accumulated on the screen frame is completed, then, the screened coal mine stone is subjected to secondary transportation.

[0027] Beneficial effects:

[0028] 1, the coal mine transportation and screening device and the use method, through the elastic receiving of the coal mine stone by the poking plate and the inclined guiding of the coal mine stone by the dropping plate, the fragmentation caused by excessive falling kinetic energy during the filling of the coal mine stone is avoided, the effective extraction and utilization rate of the coal mine stone is improved, the filter cloth can adsorb and collect the suspended dust during screening, the one-way air inlet valve can control the air inlet mode of the air bag, the dust backflow during screening is avoided, through the intermittent gas blowing effect, a certain degree of dredging effect can be provided for the screen, the probability of blockage is reduced, the heat dissipation effect during the screening of the coal mine stone is improved, the adverse consequences caused by excessive friction are avoided, and the safety and stability of the device during long-time operation are improved.

[0029] 2. The coal mine transport screening device and its usage method described in this invention, through the reciprocating deflection and lateral swing of the screen frame, can increase the travel distance of a unit volume of coal ore within a limited space, thereby increasing the effective contact and coverage area between the coal ore and the screen frame, increasing the screening rate and effective screening volume. Through the deceleration and partitioning effect of the speed reducer, the coal ore can be frequently flipped in multiple layers during the screening process, which increases the screening rate while reducing the probability of the bottom coal ore being decomposed and broken due to repeated friction from the screen frame.

[0030] 3. The coal mine transportation screening device and its usage method described in this invention, through the independent setting of screens at multiple workstations, can improve the rate of subsequent cleaning, maintenance and replacement, avoiding the cost loss of replacing the entire existing screening equipment due to local wear and tear. Moreover, the screen tilt angle can be changed to adapt to the diameter of the coal ore particles being screened, further adapting to the different needs of coal ore screening scenarios. This is different from existing multi-level screening equipment and saves costs. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 This is a partial three-dimensional structural diagram of the present invention (with one side dust shield removed).

[0034] Figure 3 For the present invention Figure 1 A top-down view;

[0035] Figure 4 For the present invention Figure 3 A schematic cross-sectional view along the AA direction;

[0036] Figure 5 This is a schematic diagram showing the positional relationship between the frame, screen frame, and receiving hopper of the present invention.

[0037] Figure 6 For the present invention Figure 5 Enlarged view of point B;

[0038] Figure 7 For the present invention Figure 5 Enlarged view of point C;

[0039] Figure 8 This is a schematic diagram showing the positional relationship between the screen frame, the retaining ring, and the airbag in this invention;

[0040] Figure 9 For the present invention Figure 8 Enlarged diagram of point D;

[0041] Figure 10 The schematic view of the position relation of the transverse plate, the baffle and the air bag of the present application;

[0042] Figure 11 The enlarged schematic view of E of the present application; Figure 10

[0043] In the figure: 1, frame; 2, vibrating seat; 3, screen frame; 4, receiving hopper; 31, transverse plate; 311, embedded groove; 5, drive shaft; 32, partition plate; 33, dust removal rod; 34, screen; 341, plug-in rod; 35, deflection plate; 321, deceleration groove; 322, deceleration plate; 323, traction ball; 324, rocking shaft; 325, convex ball; 342, fan-shaped strip; 6, brake ring; 61, baffle; 62, air bag; 63, one-way air inlet valve; 36, extrusion claw; 51, drive gear; 7, fixed disc; 71, clamping jaw; 72, drive rack; 73, hydraulic cylinder; 8, blanking plate; 9, dust shield; 74, winding shaft; 741, filter cloth; 81, toggle lever. DETAILED DESCRIPTION

[0044] In order to make the technical means, creative features, purposes and effects realized by the present application easy to understand, the present application is further described below in combination with specific embodiments. In this process, in order to ensure the clarity and convenience of the description, we may exaggerate the width of the lines or the size of the constituent elements in the drawings.

[0045] In addition, the terms in the following text are defined based on the functions in the present application, which may be different according to the intentions or habits of users or operators, therefore, these terms are defined based on the entire content of the present specification.

[0046] An embodiment of the present application, refer to Figures 1 to 4 A coal mine conveying and screening device, comprising a frame 1, a vibrating seat 2 and a screen frame 3, the vibrating seat 2 is detachably installed around the bottom of the frame 1, the screen frame 3 is detachably installed on the inner side of the frame 1, the frame 1 is a "convex" structure, a through slot is symmetrically formed on the bottom of the frame 1, a receiving hopper 4 is slidingly installed in the slot, a material inlet is arranged on the top of the frame 1, and the screen frame 3 is located between the receiving hopper 4 and the material inlet.

[0047] ​Specifically, first, the staff will be the whole screening device to the work site, and adjust the level, then, two receiving hopper 4 is installed to the left and right sides of the rack 1 through the slot, then, start the vibration seat 2, so that the whole screening device vibration, then, through the staff or existing conveying equipment will be screened coal mine stone filling to the top of the rack 1 into the material, then, under the action of gravity, coal mine stone free fall and arrive at the screen frame 3, then, through the screening effect of screen frame 3, so that the coal mine below the target diameter size of the stone fell to the receiving hopper 4 below.

[0048] As an embodiment of the present application, as shown in Figure 2 、 Figure 4 and Figure 8 , the screen frame 3 is a quadrilateral frame structure, the side of the screen frame 3 and the inner wall of the rack 1 is reserved with a gap, and the side of the screen frame 3 is attached with an elastic material for filling the gap, the screen frame 3 comprises:

[0049] As an embodiment of the present application, as shown in Figure 7 、 Figure 10 and Figure 11 , the horizontal plate 31 is located in the middle of the quadrilateral structure of the screen frame 3, the side of the horizontal plate 31 is fixedly provided with a polygonal embedded groove 311, the side wall of the rack 1 is provided with a driving shaft 5 through bearing, one end of the driving shaft 5 is provided with a polygonal cross section which is slidingly connected with the embedded groove 311, the other end of the driving shaft 5 is exposed outside the rack 1, the exposed end of the driving shaft 5 is fixedly provided with a driving gear 51, the side wall of the rack 1 is fixedly provided with a fixed disc 7, one end of the fixed disc 7 is fixedly provided with a claw 71, the claw 71 is slidingly provided with a driving rack 72, the driving rack 72 is inclinedly installed, and the driving rack 72 is engaged with the driving gear 51, the outer wall of the rack 1 is fixedly provided with a hydraulic cylinder 73, and the output shaft of the hydraulic cylinder 73 is connected with the driving rack 72;

[0050] In actual operation, initially, the hydraulic cylinder 73 is in a non-working state. At this time, under the meshing action of the drive rack 72 and the drive gear 51, the drive shaft 5 is locked. Furthermore, under the engaging action of the polygonal end of the drive shaft 5 and the embedded groove 311, the screen frame 3 is horizontally placed inside the frame 1. With the feeding of coal ore, after the coal ore enters through the feed inlet, it slides freely from the centrally located horizontal plate 31 to both ends of the screen frame 3 under the action of gravity and is screened. When the unit volume of coal ore has been supplied, the hydraulic cylinder 73 is activated, causing its output shaft to reciprocate and extend, thereby outputting the ore. The shaft drives the drive rack 72 to slide back and forth on the chuck 71. Through the meshing transmission between the drive rack 72 and the drive gear 51, the screen frame 3 reciprocates around the central axis of the drive shaft 5. During the forward deflection of the screen frame 3, the coal ore slides down to the bottom of the forward tilt position of the screen frame 3 under the action of gravity. The same applies to the reverse. Unlike the unidirectional passage method of existing vibrating screening devices, the reciprocating deflection of the screen frame 3 can increase the movement of a unit volume of coal ore in a limited space, thereby improving the effective contact and coverage area between the coal ore and the screen frame 3 and increasing the screening rate.

[0051] As one embodiment of the present invention, such as Figure 4 , Figure 5 , Figure 8 and Figure 10 As shown, symmetrical drop plates 8 are installed on both sides of the top feed inlet of the frame 1. The drop plates 8 are inclined "L"-shaped structures, and the lower part of the drop plates 8 has a bent arc surface that fits against the outer wall of the fixed plate 7. The screen frame 3 is located below the drop plates 8, and a gap is reserved between the lower end of the drop plates 8 and the screen frame 3 for coal mine passage. Dust shields 9 are detachably installed on the upper part of both sides of the frame 1. A winding mechanism is installed on the fixed plate 7 via bearings. A filter cloth 741 is wound on a shaft 74. The filter cloth 741 is located above the screen frame 3 and its end is fixedly connected to the dust cover plate 9. A lever 81 is evenly installed at the top feed inlet of the frame 1 by means of rotational engagement. The lever 81 is located above the discharge plate 8 and extends towards the middle of the base frame. A torsion spring is connected between the lever 81 and the frame 1. In its natural state, the lever 81 is horizontally placed.

[0052] In the specific operation, before the screening operation, the dust cover 9 is installed on both sides of the frame 1 by the staff to seal the screening area. Then, the filter cloth 741 is pulled out from the take-up shaft 74 and its end is fixed to the dust cover 9. The filter cloth 741 adsorbs and collects the suspended dust during screening. Then, during the initial loading of coal ore, the falling coal ore first contacts the horizontally positioned actuating rod 81. Then, the actuating rod 81 deflects and decelerates the coal ore in contact with it. The inclined dropping plate 8 can catch the falling coal ore a second time, thereby avoiding the breakage caused by excessive falling kinetic energy during the coal ore loading process and improving the effective extraction and utilization rate of coal ore.

[0053] As one embodiment of the present invention, such as Figure 5 As shown, partitions 32 are located on both sides of the horizontal plate 31 and are parallel to the horizontal plate 31. A series of deceleration grooves 321 are evenly distributed in the middle of the partitions 32. These grooves are staggered left and right and located near the screens 34 on the left and right sides of the partitions 32. Deceleration plates 322 are installed in the deceleration grooves 321 through a rotatable engagement. Torsion springs connect the deceleration plates 322 to the partitions 32. The upper part of each deceleration plate 322 is provided with a corresponding... The screen 34 is inclined in opposite directions. The lower part of the speed reduction plate 322 is connected to the traction ball 323 by the traction rope. Both ends of the partition plate 32 are equipped with a rocking shaft 324 through bearings. The rocking shaft 324 is parallel to the central axis of the dust removal rod 33. The inner wall of the frame 1 near the rocking shaft 324 is evenly equipped with convex balls 325 from top to bottom. The convex balls 325 on the two side walls of the frame 1 are staggered vertically, and the convex balls 325 are all in contact with the rocking shaft 324.

[0054] In particular, during the reciprocating deflection movement of the screen frame 3, the baffle 32 synchronously performs a deflection movement. When the coal and ore slide under the action of gravity and pass through the position of the deceleration groove 321, due to the inclined surface provided on the upper part of the deceleration plate 322, part of the bottom layer of coal and ore stops moving immediately after being subjected to the blocking effect of the back of the inclined surface of the deceleration plate 322 at a predetermined position. The middle and upper layers of coal and ore continue to slide to the end of the screen frame 3 after passing over the deceleration plate 322. Another part of the coal and ore is decelerated under the inclined lifting effect of the front of the inclined surface of the deceleration plate 322 at another predetermined position, and finally passes over the deceleration plate 322 and reaches the end position of the screen frame 3. Thus, before the coal and ore passes through the position of the deceleration groove 321, the sliding speed of the coal and ore at the same level is basically the same. When the movement path of the coal and ore is blocked by the deceleration plate 322 in different inclined states, the inherent mode of movement of part of the coal and ore in the blocked area is changed, thereby causing the coal and ore in the blocked area of the deceleration plate 322 to be flipped in the thickness level of the accumulation. The coal and ore in the middle and upper layers is changed to the middle and lower layers after passing over the deceleration plate 322. Similarly, during one flipping cycle of the screen frame 3, the coal and ore in the accumulation state can be flipped multiple times. Unlike the operation mode of screening the coal and ore layer by layer from bottom to top, the deceleration and blocking effect of the deceleration plate 322 can further improve the screening rate of the coal and ore and reduce the probability of decomposition and crushing of the bottom layer of coal and ore due to repeated friction of the screen frame 3, thereby improving the effective extraction and utilization rate of the coal and ore.

[0055] The traction ball 323 provided at the lower part of the deceleration plate 322 can make the deceleration plate 322 itself sway under the action of gravity, thereby avoiding the blocking and jamming phenomenon of the coal and ore under the blocking effect of the deceleration plate 322 and further improving the stability of the device operation. During the reciprocating swinging of the screen frame 3, the swinging shaft 324 synchronously swings with the screen frame 3 and intermittently contacts the convex ball 325, thereby making the screen frame 3 itself horizontally move and sway, further making the coal and ore accumulated on the screen frame 3 as a whole present an “S” shape sliding and screening mode. The elastic material provided at the side of the screen frame 3 can adapt to the gap change between the screen frame 3 and the rack 1 when the screen frame 3 swings and provide a restoring force.

[0056] As an embodiment of the present application, as shown in Figure 6 、 Figure 9 and Figure 11 , the dust removal rod 33 is uniformly provided with a plurality of dust removal rods 33 on the inner side of the screen frame 3. The plurality of dust removal rods 33 are equidistantly arranged. The middle part of the dust removal rod 33 is a hollow structure, and the side wall of the dust removal rod 33 is provided with a gas hole in communication with the inner side hollow cavity.

[0057] As an embodiment of the present application, as shown in Figure 6 、 Figure 9 、 Figure 10 and Figure 11As shown, the screen 34 is a mesh porous material, the screen 34 is installed between two adjacent dust removal rods 33, and a plurality of screens 34 are uniformly arranged on both sides of the partition plate 32, the middle of both ends of the screen 34 is fixedly installed with a plug-in rod 341, and the end of the plurality of plug-in rods 341 is respectively plugged into the side of the screen frame 3, the partition plate 32 and the horizontal plate 31 in a rotating fit manner, the two sides of the screen 34 are fixedly installed with a fan-shaped strip 342, the arc surface of the fan-shaped strip 342 has a linear distance greater than the diameter of the dust removal rod 33 at both ends, and the arc surface of the fan-shaped strip 342 is in sliding contact with the outer wall of the dust removal rod 33. The side wall of the dust removal rod 33 close to the fan-shaped strip 342 is uniformly provided with a groove, and the air holes are uniformly arranged in the groove, and the air exhaust direction of the air holes points to the arc surface of the fan-shaped strip 342.

[0058] In specific work, under the initial condition, the installation state of the screen 34 between the two adjacent dust removal rods 33 is adjusted by the worker, so that the screen 34 can be installed in a horizontal or inclined state, and after the adjustment is completed, the plug-in rod 341 is locked by the stop screw, so that the horizontal or inclined placement state of the screen 34 is locked. When the screen 34 is in a horizontal working state, the diameter of the coal and stone particles that can be screened by the screen frame 3 is the minimum value, and the coal and stone fragments below the target diameter fall through the mesh holes on the screen 34. When the screen 34 is installed in an inclined state, according to the inclination angle of the screen 34, the gap between the screen 34 and the dust removal rod 33 changes, and the diameter of the coal and stone particles falling through the gap changes. Therefore, the inclination angle of the screen 34 can be changed to adapt to the diameter of the coal and stone particles to be screened, and further adapt to different scene requirements of coal and stone screening. Unlike the existing multi-level screening equipment, the cost is saved. The fan-shaped strip 342 arranged at the side of the screen 34 can change the inclination angle of the screen 34 without changing the screening diameter, so as to change the sliding direction of the coal and stone on the upper layer of the screen 34, further improve the spreading range of the coal and stone on the screen frame 3, and improve the screening efficiency. At the same time, the screen 34 arranged independently in multiple stations can also improve the cleaning and maintenance replacement rate in the later period, avoiding the cost loss caused by the overall replacement of the existing screening equipment due to local wear and tear.

[0059] As an embodiment of the present application, as shown in Figure 4 As shown, the deflector plate 35 is vertically installed at both ends of the screen frame 3, the distance between the upper and lower ends of the deflector plate 35 is greater than the thickness of the screen frame 3, a torsion spring is connected between the deflector plate 35 and the screen frame 3, and the deflector plate 35 is in sliding contact with the inner wall of the rack 1.

[0060] Specifically, during the reciprocating deflection and screening of the screen frame 3, the deflection plate 35 can be adaptively attached to the inner wall of the frame 1 to slide under the action of the torsional spring, and can block the coal and ore falling to the bottom of the screen frame 3, so as to avoid the accumulation of coal and ore to cause the jamming of the rotating action of the screen frame 3, and improve the stability of the device operation.

[0061] As an embodiment of the present application, as shown in Figure 4 、 Figure 8 、 Figure 10 and Figure 11 , the two side walls of the frame 1 are symmetrically provided with a brake ring 6, the driving shaft 5 vertically penetrates the center axis position of the brake ring 6, the lower part of the brake ring 6 is fixedly provided with a baffle 61, the baffle 61 is located below the horizontal plate 31 and does not contact the horizontal plate 31, the middle part of the brake ring 6 is provided with an arc-shaped notch with an acute angle at the two ends, the screen frame 3 is located between the arc-shaped notches and the side wall of the screen frame 3 abuts against the two ends of the arc-shaped notch of the brake ring 6, the lower part of the baffle 61 is fixedly provided with an air bag 62 made of elastic material, the middle cavities of the plurality of dust removal rods 33 are communicated with the air bag 62 through air pipes, the two side walls of the frame 1 are fixedly provided with a one-way air inlet valve 63, and the one-way air inlet valve 63 is respectively communicated with the two ends of the air bag 62, the two sides of the horizontal plate 31 are fixedly provided with an extrusion claw 36, the lower part of the extrusion claw 36 is arc-shaped, and the lower parts of the plurality of extrusion claws 36 abut against the two side walls of the air bag 62.

[0062] Specifically, during the reciprocating deflection of the screen frame 3, the deflection angle of the screen frame 3 can be limited by the arc-shaped notch of the brake ring 6, the extrusion claw 36 provided on the horizontal plate 31 is synchronously deflected, and the lower end of the extrusion claw 36 extrudes the air bag 62 during deflection, then the compressed gas in the air bag 62 flows through the middle cavities of the dust removal rods 33 and is finally discharged outward from the air holes, the one-way air inlet valve 63 controls the air inlet mode of the air bag 62 to avoid dust backflow during screening, the intermittent air blowing effect can provide a certain degree of dredging effect for the screen 34 to avoid blockage, and the heat dissipation effect during the screening of coal and ore is improved to avoid the adverse consequences caused by excessive friction and improve the safety and stability of the device during long-term operation.

[0063] In addition, the present application also provides a production method of a coal mine transportation and screening device, which comprises the following steps:

[0064] S1, operation inspection: first, the staff will be the whole screening device in the work site, and adjust the level, then, two material receiving hopper 4 is respectively installed to the left and right sides of the rack 1 through the slot, then, start the vibration seat 2, make the whole screening device vibrate, in the initial state, the hydraulic cylinder 73 is in the non-working state, at this time, under the meshing effect of the drive rack 72 and the drive gear 51, the drive shaft 5 is in the locking state, and under the clamping effect of the polygonal end of the drive shaft 5 and the embedded groove 311, the screen frame 3 is horizontally placed at the inside of the rack 1, then, the staff pre-installs the dust cover 9 on both sides of the rack 1, so as to close the screening area, then, the filter cloth 741 is pulled out from the winding shaft 74, and the end is fixed to the dust cover 9.

[0065] S2, coal filling: the staff or existing conveying equipment fills the coal to be screened into the inlet on the top of the rack 1, in the initial filling process of the coal, the falling coal first contacts the horizontal state of the stirring rod 81, then the stirring rod 81 is deflected, and the coal in contact with it is decelerated, the inclined setting of the falling plate 8 can secondarily accept the falling coal, so as to avoid the fragmentation caused by the excessive kinetic energy of the falling coal in the filling process, then, under the action of gravity, the coal freely falls and reaches the screen frame 3, accompanied by the supply of the coal, when the coal enters from the inlet, under the action of gravity, the horizontal plate 31 at the center position freely slides to both ends of the screen frame 3 and is screened, when the unit volume of coal is supplied, start the hydraulic cylinder 73, make its output shaft reciprocating motion, then drive the drive rack 72 to reciprocate on the jaw 71 through its output shaft, make the screen frame 3 reciprocating deflection motion with the center axis of the drive shaft 5 as the rotation center through the meshing transmission between the drive rack 72 and the drive gear 51, in the process of forward deflection of the screen frame 3, the coal immediately slides to the bottom of the forward inclined position of the screen frame 3 under the action of gravity, vice versa, different from the one-way passing mode of the existing vibrating screening device, through the reciprocating deflection motion of the screen frame 3, the unit volume of coal can increase its moving stroke in the limited space, so as to improve the effective contact and coverage area between the coal and the screen frame 3, and improve the screening rate.

[0066] S3, screening treatment: in a turning period of the screen frame 3, the coal and ore in the accumulation state can be turned over multiple times under the partitioning effect of the deceleration plate 322, and in the reciprocating deflection process of the screen frame 3, the extrusion claw 36 arranged on the horizontal plate 31 is deflected synchronously, and in the deflection process of the extrusion claw 36, the lower end of the extrusion claw 36 extrudes the air bag 62, then the compressed gas in the air bag 62 flows through the middle cavity of the dust removal rod 33, and is finally discharged outward from the air hole, the one-way air inlet valve 63 arranged can control the air inlet mode of the air bag 62, avoid the backflow of dust during screening, and through the intermittent air blowing effect, a certain degree of dredging effect can be provided for the screen 34 to avoid blockage, increase the heat dissipation effect during the screening process of the coal and ore, avoid the adverse consequences caused by excessive friction, and improve the safety and stability during long-time operation of the device.

[0067] S4, discharge and collection: the fan-shaped strip 342 arranged at the side of the screen 34 can change the inclination angle of the screen 34 under the condition that the screening diameter is not changed, so as to change the sliding direction of the coal and ore on the upper layer of the screen 34, further improve the spreading range of the coal and ore on the screen frame 3, improve the screening efficiency, change the inclination state of the screen 34, and perform grading and screening treatment on the coal and ore with different diameters, so that the coal and ore with a diameter smaller than the target diameter is dropped into the receiving hopper 4 in batches, then the staff or the existing traction equipment performs the taking-out and replacement operation of the receiving hopper 4, until the screening of the coal and ore accumulated on the screen frame 3 is completed, then the screened coal and ore is transported again.

[0068] The basic principles, main features and advantages of the present application are shown and described. It should be understood by those skilled in the art that the present application is not limited to the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A coal mine transport screening device, characterised in that, Include: Rack (1); the bottom of rack (1) is symmetrical left and right and has a through slot, a receiving hopper (4) is slidingly installed in the slot, a feeding port is arranged at the top of rack (1), brake rings (6) are symmetrically installed on the inner walls of the two sides of rack (1), baffle plates (61) are fixedly installed at the lower parts of brake rings (6), air bags (62) made of elastic material are fixedly installed at the lower parts of baffle plates (61), one-way air inlet valves (63) are fixedly installed on the two side walls of rack (1) and are in communication with the two ends of air bags (62) respectively; Vibration seat (2); the vibration seat (2) is installed around the bottom of rack (1); Screen frame (3); the screen frame (3) is installed on the inner side of rack (1), the screen frame (3) is located between the receiving hopper (4) and the feeding port, a gap is reserved between the side edge of the screen frame (3) and the inner wall of the rack (1), and an elastic material is attached to the side edge of the screen frame (3) to fill the gap, the side wall of the screen frame (3) is in abutting contact with the two ends of the arc-shaped notch of the brake ring (6), and deflection plates (35) are vertically installed at the two ends of the screen frame (3), the distance between the upper and lower ends of the deflection plate (35) is greater than the thickness of the screen frame (3), torsion springs are connected between the deflection plate (35) and the screen frame (3), and the deflection plate (35) is in sliding contact with the inner wall of the rack (1); The screen frame (3) comprises: Horizontal plate (31), the horizontal plate (31) is located in the middle of the quadrilateral structure of the screen frame (3), the side edge of the horizontal plate (31) is fixedly provided with a polygonal embedded groove (311), the side wall of the rack (1) is provided with a driving shaft (5) through a bearing, one end of the driving shaft (5) is provided with a polygonal cross section slidingly connected with the embedded groove (311), the driving shaft (5) vertically penetrates the center axis position of the brake ring (6), the two sides of the horizontal plate (31) are fixedly provided with extrusion claws (36), the lower part of the extrusion claw (36) is in arc-shaped structure, and the lower parts of the plurality of extrusion claws (36) are respectively abutted on the two side walls of the air bag (62); Partition plate (32), the partition plate (32) is respectively located at the two sides of the horizontal plate (31), and the partition plate (32) is arranged in parallel with the horizontal plate (31), the two ends of the partition plate (32) are provided with rocking shafts (324) through bearings, the inner wall of the rack (1) near the rocking shaft (324) is uniformly provided with convex balls (325) from top to bottom, the convex balls (325) on the two side walls of the rack (1) are vertically staggered, and the convex balls (325) are in abutting contact with the rocking shaft (324); Dust removal rod (33), a plurality of dust removal rods (33) are uniformly installed on the inner side of the screen frame (3), the middle part of the dust removal rod (33) is in cavity structure, and the side wall of the dust removal rod (33) is provided with air holes in communication with the inner cavity thereof, the middle cavities of the plurality of dust removal rods (33) are in communication with the air bag (62) through air pipes; The screen (34) is installed between two adjacent dust removal rods (33), and a plurality of screens (34) are uniformly arranged on both sides of the partition plate (32), the middle of the two ends of the screen (34) is fixedly installed with a plug-in rod (341), and the ends of the plurality of plug-in rods (341) are respectively plugged into the side edges of the screen frame (3), the partition plate (32) and the horizontal plate (31) through rotating cooperation, and the two sides of the screen (34) are fixedly installed with a fan-shaped strip (342), the arc surface of the fan-shaped strip (342) has a linear distance greater than the diameter of the dust removal rod (33) at the two ends, and the arc surface of the fan-shaped strip (342) is in sliding contact with the outer wall of the dust removal rod (33).

2. A coal mine transport screening device as claimed in claim 1, characterised in that: The middle of the partition plate (32) is uniformly provided with a speed reduction groove (321), and a plurality of speed reduction grooves (321) are left-right staggered and close to the screens (34) on the left and right sides of the partition plate (32), respectively, and the speed reduction groove (321) is provided with a speed reduction plate (322) through rotating cooperation.

3. A coal mine transport screening device as claimed in claim 1, characterised in that: One end of the drive shaft (5) is exposed outside the rack (1), and the exposed end of the drive shaft (5) is fixedly installed with a drive gear (51), the side wall of the rack (1) is fixedly installed with a fixed disc (7) in a penetrating manner, one end of the fixed disc (7) is fixedly plugged with a clamping jaw (71), the clamping jaw (71) is slidingly installed with a drive rack (72), the drive rack (72) is installed in an inclined manner, and the drive rack (72) is engaged with the drive gear (51), the outer wall of the rack (1) is fixedly installed with a hydraulic cylinder (73), and the output shaft of the hydraulic cylinder (73) is connected with the drive rack (72).

4. A coal mine transport screening device as claimed in claim 1, characterised in that: The rack (1) is provided with a blanking plate (8) on both sides of the top inlet, and the screen frame (3) is located below the blanking plate (8).

5. A coal mine transport screening apparatus as claimed in claim 4, wherein: The left and right sides of the rack (1) are provided with a dust cover (9) in an upper portion, the fixed disc (7) is provided with a winding shaft (74) through bearing installation, the winding shaft (74) is provided with a filter cloth (741), the filter cloth (741) is located above the screen frame (3) and is fixedly connected with the dust cover (9), and the top inlet of the rack (1) is provided with a driving rod (81) through rotating cooperation.

6. A coal mine transport screening apparatus as claimed in any one of claims 1 to 5 wherein: The specific method for using the coal mine conveying and screening device includes the following steps: S1, operation check: first, the whole screening device is placed in the working site by the staff, and the horizontal degree is adjusted, then the two receiving hoppers (4) are slidingly installed in the penetrating grooves on the left and right sides of the rack (1), then the vibration seat (2) is started to make the whole screening device vibrate; S2, coal mine stone filling: the coal mine stone to be screened is filled into the inlet on the top of the rack (1) by the staff or the existing conveying equipment, then under the action of gravity, the coal mine stone falls freely and reaches the screen frame (3); S3, screening treatment: the coal mine stone is subjected to multi-stage screening treatment by the screen (34) arranged in the middle of the screen frame (3), and the coal mine stone with a diameter smaller than the target diameter is dropped into the receiving hopper (4) below in batches; S4, collecting and transporting: the taking out and replacing operation of the hopper (4) is performed by workers or existing traction equipment until the screening of the coal and ore accumulated on the screen frame (3) is completed, and then the screened coal and ore is transported again.

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