Variable aperture screening apparatus and method of use

Abstract

The variable screen aperture screening device and the use method are disclosed, the device comprises a frame and a support supporting the frame, a plurality of screen shafts are equidistantly arranged in the inside of the frame, the two ends of the screen shaft are movably connected with the frame, and a motor for driving the screen shaft to rotate is arranged at one end of the screen shaft, and the extension direction of the screen shaft is perpendicular to the feeding direction; the screen shaft is connected with a power device, and the power device is used for controlling the screen shaft to slide relative to the frame to form the adjustment of the screen aperture; when the screening device is used, firstly, the electromagnetic cylinder is stretched to drive the screen shaft to move to both sides, the screen aperture is adjusted to the maximum, then after the coal amount tends to be stable, the screen aperture is adjusted to be small, and when the working face passes through the geological broken zone, the screen aperture is adjusted to the minimum value. The variable screen aperture screening device can automatically change the screen aperture, the size of the screen shaft does not need to be manually replaced, the working efficiency is improved, the operation intensity is reduced, and the operation safety is improved.

Description

Technical Field

[0001] This invention belongs to the field of coal mine production screening technology, specifically relating to a screening device with variable screen aperture, and also relating to a method of using the above-mentioned screening device. Background Technology

[0002] Traditional coal mine screening devices work by separating solid materials according to the required particle size using screens of different sizes. However, to achieve a change in screen size, the transport system must be stopped, the screen shaft must be removed, and then the screen shaft of the required size must be manually reinstalled onto the screening support. This increases the workload of the operators and extends the operation time.

[0003] Meanwhile, in order to adapt to the peak conveyor belt capacity of the working face, the equipment is usually selected according to the maximum transport capacity. As the transport capacity of the equipment increases, the external size of the equipment will also increase accordingly, the overlap height between the equipment will increase accordingly, and the size of the roadway where the equipment is placed will also need to be increased. However, if the roadway cross-section is too large, there is a risk of construction difficulty and gas accumulation at the intersection with the small end face roadway. Summary of the Invention

[0004] The purpose of this invention is to provide a screening device with a variable screen aperture that can automatically change the screen aperture without the need for manual replacement of the screen shaft size, thereby improving work efficiency, reducing labor intensity, and increasing work safety.

[0005] Another object of the present invention is to provide a method of using the above-mentioned screening equipment with variable sieve aperture.

[0006] The first technical solution adopted in this invention is a screening device with variable screen aperture, including a frame and a support for the frame. Several screen shafts are evenly arranged inside the frame. The two ends of the screen shafts are movably connected to the frame, and one end of the screen shaft is equipped with a motor to drive the screen shaft to rotate. The extension direction of the screen shaft is perpendicular to the feeding direction. The screen shaft is connected to a power device, which is used to control the screen shaft to slide relative to the frame, thereby adjusting the screen aperture.

[0007] The first technical solution of the present invention is further characterized in that,

[0008] The frame is equipped with slide rails on both sides, and bearings corresponding to the screen shaft are installed inside the slide rails. Both ends of the screen shaft are connected to the bearings installed opposite to each other. Bearing fixing devices are connected to the outside of the bearings, and the bearing fixing devices are movably connected to the slide rails.

[0009] The power unit includes several electromagnetic cylinders arranged in a mirror image with respect to the center line of the vertical frame. The extension direction of the electromagnetic cylinders is perpendicular to the screen shaft, and the length of the electromagnetic cylinders gradually increases in the direction away from the frame.

[0010] One end of the electromagnetic cylinder is fixed, and the other end is connected to a corresponding bearing fixing device. The electromagnetic cylinder is connected in sequence to an electromagnetic valve and an air pump that control the extension and retraction of the electromagnetic cylinder through an air pipe.

[0011] An electromagnetic sensor is connected to the electromagnetic cylinder, and a scale line is also set on the outside of the electromagnetic cylinder. The extension and retraction distance of the electromagnetic cylinder is controlled by the electromagnetic sensor and the scale line.

[0012] The length difference between adjacent electromagnetic cylinders is equal.

[0013] The solenoid valve is equipped with a solenoid switch.

[0014] The electromagnetic cylinder furthest from the frame is connected to a steel plate push-pull frame, which is connected to a telescopic steel plate. The telescopic steel plate is laid flat on the frame and moves synchronously with the adjustment of the screen hole diameter.

[0015] Another technical solution adopted in this invention is a method of using a variable sieve aperture screening device, comprising the following steps:

[0016] Step 1: Start the motor to drive the screen shaft to rotate. Run the power unit and the electromagnetic cylinder to stretch and drive the screen shaft to move to both sides. Adjust the screen hole diameter to the maximum. The telescopic steel plate moves to the retracted state with the electromagnetic cylinder.

[0017] Step 2: As the coal quantity stabilizes, the power unit and electromagnetic cylinder contract to drive the two screens on both sides to converge in the middle. The screen aperture is adjusted according to the coal quantity. The telescopic steel plate moves to the stretched state with the electromagnetic cylinder.

[0018] Step 3: When the working face is in a geologically fractured zone, the power unit is activated and the electromagnetic cylinder is contracted to drive the two screens on both sides to converge in the middle. The screen hole diameter is adjusted to the minimum value, and the telescopic steel plate moves with the electromagnetic cylinder to the maximum tension state.

[0019] Step 4: After passing through the geological fracture zone, operate the power unit to adjust the screen shaft to the state in Step 2.

[0020] The beneficial effects of this invention are:

[0021] (1) The variable screen aperture screening equipment of the present invention connects the electromagnetic cylinder to the screen shaft and drives the screen shaft to move through the electromagnetic cylinder, which can automatically complete the adjustment of the screen aperture size without the need for manual replacement of the screen shaft size, thereby improving work efficiency, reducing work intensity and increasing work safety. By setting a scale line on the outside of the electromagnetic cylinder and cooperating with the electromagnetic sensor, it is ensured that the electromagnetic cylinder drives the screen shaft to move at equal intervals, and the screen aperture size can be accurately controlled.

[0022] (2) The variable screen aperture screening equipment of the present invention is equipped with telescopic steel plates on both sides of the screening equipment, which ensures that after the screen aperture is adjusted, the material can still be conveyed to the screen shaft position to complete the size screening of the material. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the variable sieve aperture screening device of the present invention;

[0024] Figure 2 This is a top view of the variable sieve aperture screening device of the present invention in the large sieve aperture state;

[0025] Figure 3 This is a top view of the variable sieve aperture screening device of the present invention in the small sieve aperture state;

[0026] Figure 4 This is a side view of the screening device with variable sieve aperture of the present invention;

[0027] Figure 5 This is a cross-sectional view of the screen shaft fixing device.

[0028] In the diagram, 1. Frame, 2. Support, 3. Screen shaft, 4. Motor, 5. Power unit, 51. Air pump, 52. Electromagnetic cylinder, 53. Electromagnetic sensor, 54. Electromagnetic valve, 55. Magnetic valve switch, 56. Air pipe, 6. Bearing, 7. Bearing fixing device, 8. Slide rail, 9. Telescopic steel plate, 10. Steel plate push-pull frame. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] Example 1

[0031] like Figure 1 and Figure 2 As shown, the variable screen aperture screening device disclosed in this invention includes a frame 1 and supports 2 for supporting the frame 1. In this embodiment, three supports 2 are used to support the frame 1. A plurality of screen shafts 3 are evenly arranged on the inner side of the frame 1, and the extending direction of the screen shafts 3 is perpendicular to the feeding direction. Slide rails 8 are provided on opposite sides of the frame 1, and bearings 6 corresponding to the screen shafts 3 are installed inside the slide rails 8. Both ends of the screen shafts 3 are connected to the corresponding bearings 6. Figure 5 As shown, in order to improve the stability of the screen shaft 3 when it moves, a bearing fixing device 7 is connected to the outside of the bearing 6. The bearing fixing device 7 is movably connected to the slide rail. When the bearing fixing device 7 slides relative to the frame 1, it drives the screen shaft 3 to move and completes the adjustment of the screen hole diameter.

[0032] The end of the screen shaft 3 that passes through the bearing 6 is connected to a motor 4 that drives the screen shaft 3 to rotate. The motor 4 drives the screen shaft 3 to rotate, thereby guiding the material to move on the screening equipment.

[0033] like Figure 4 As shown, electromagnetic cylinders 52, corresponding to the screen shafts 3, are arranged sequentially from top to bottom below the frame 1. The electromagnetic cylinders 52 are mirror-symmetrically arranged with respect to the center line perpendicular to the frame 1, and one end of each electromagnetic cylinder 52 is fixed. Specifically, one end of each electromagnetic cylinder 52 is fixed to the intermediate support 2, and the other end is connected to the corresponding screen shaft 3. The connection relationship between the electromagnetic cylinders 52 and the screen shafts 3 is as follows: the screen shafts 3 radiating outwards from the intermediate support 2 are sequentially connected to the electromagnetic cylinders 52 from top to bottom. That is, the innermost screen shaft 3 is connected to the uppermost electromagnetic cylinder 52, and then the screen shaft 3 outside the innermost screen shaft 3 is connected to the electromagnetic cylinder 52 below the uppermost electromagnetic cylinder 52, until all screen shafts 3 are connected to the electromagnetic cylinders 52. To provide some protection for the screen shafts 3, the electromagnetic cylinders 52 are connected to the bearing fixing device 7 that fixes the screen shafts 3.

[0034] The length of the electromagnetic cylinder 52 below the frame 1 gradually increases from top to bottom, and the length difference between adjacent electromagnetic cylinders 52 is equal. When the sieve hole diameter is adjusted, the sieve shaft 3 can move synchronously without obstructing each other, thus improving the efficiency of sieve hole adjustment.

[0035] The electromagnetic cylinder 52 is connected to the electromagnetic valve 54 and the air pump 51, which control the extension and retraction of the electromagnetic cylinder 52, through the air pipe 56. The electromagnetic valve 54 is equipped with a solenoid switch 55. That is, when the electromagnetic cylinder 52 extends and retracts, it drives the corresponding screen shaft 3 to slide relative to the frame 1, thereby adjusting the screen aperture.

[0036] Example 2

[0037] like Figure 3 As shown, the screen shaft 3 is moved towards the center by retracting the electromagnetic cylinder 52, thus reducing the screen aperture. Based on Example 1, to prevent excessive gap between the material conveyor belt and the screen shaft 3 after adjusting the screen aperture, a steel plate push-pull frame 10 is connected to the end of the electromagnetic cylinder 52 furthest from the frame 1. The steel plate push-pull frame 10 is connected to a telescopic steel plate 9, which lies flat on the frame 1. The telescopic steel plate 9 moves synchronously with the adjustment of the screen aperture. This ensures that the material can still be conveyed to the screen shaft 3 for screening after the screen aperture is adjusted.

[0038] Example 3

[0039] Based on Example 2, an electromagnetic sensor 53 is connected to the electromagnetic cylinder 52, and a scale line is set on the outside of the electromagnetic cylinder 52. Through the cooperation between the electromagnetic sensor 53 and the scale line, the extension and retraction distance of each electromagnetic cylinder 52 is precisely controlled to ensure that the extension and retraction distance of each electromagnetic cylinder 52 is the same and to maintain the uniform size of the sieve holes.

[0040] The method of using the variable sieve aperture screening equipment disclosed in this invention, employing the variable sieve aperture screening equipment of Embodiment 3 above, includes the following steps:

[0041] Step 1: Start motor 4 to drive screen shaft 3 to rotate, run power device 5, electromagnetic cylinder 52 to stretch and drive screen shaft 3 to move to both sides, screen hole diameter is adjusted to the maximum, telescopic steel plate 9 moves to the retracted state with electromagnetic cylinder 52.

[0042] Step 2: As the coal quantity stabilizes, the power unit 5 and the electromagnetic cylinder 52 retract, causing the two screen shafts 3 on both sides to converge towards the center. The screen aperture diameter is adjusted according to the coal quantity; that is, as the coal quantity gradually decreases, the screen aperture diameter is adjusted accordingly. However, during the stable period when the coal quantity is gradually decreasing, the screen aperture diameter is not adjusted. The telescopic steel plate 9 moves to the stretched state with the electromagnetic cylinder 52, and the screen aperture diameter gradually decreases, completing the screening of material size.

[0043] Step 3: When the working face passes through the geological fracture zone, the power unit 5 and the electromagnetic cylinder 52 are operated to retract and drive the two screen shafts 3 to converge towards the middle, adjust the screen hole diameter to the minimum value, and the telescopic steel plate 9 moves with the electromagnetic cylinder 52 to the maximum tension state.

[0044] Step 4: After passing through the geological fracture zone, operate the power unit 5 and adjust the screen shaft 3 to a state where the coal flow is stable.

[0045] Example 4

[0046] A certain mine has a designed production capacity of 1.5 Mt / a, employing a combination of inclined and vertical shaft development, as well as single-level development. The main coal seam is No. 2, with an average thickness of 3.59 m. Some areas contain 1-4 layers of interbedded rock, with interbedded rock thicknesses ranging from 0.08 to 0.85 m. The coal seam depth ranges from 290 to 540 m. The normal coal yield at the working face is 1200 t / h, and the peak coal yield is 3000 t / h. Due to severe ineffective hoisting of rock and the difficulty in its disposal, the mine adopts an underground coal-rock separation and slurry backfilling method to dispose of the rock. Raw coal screening data shows that 80% of the raw coal has a particle size of 80 mm, and 35% of the raw coal contains rock. Except for a few large pieces, the particle size of both raw coal and rock is less than 300 mm.

[0047] When the screening equipment of this invention is started, the initial peak conveying capacity of raw coal is relatively large, such as... Figure 2As shown, the electromagnetic cylinder 52 pulls the bearing fixing device 7 to push the screen shaft 3 to the maximum screen hole state to accommodate the peak coal quantity. The screen shaft 3 rotates at a constant speed under the action of the motor 4. At this time, the telescopic steel plate 9 is in the retracted state and the screen hole is 300mm. Only coal gangue with a diameter greater than 300mm enters the dry separation system for separation through the transfer equipment. The raw coal of the working face basically enters the bottom coal bunker.

[0048] Once the coal supply at the working face has stabilized, such as Figure 3 As shown, the solenoid valve switch 55 and the air pump 51 are turned on, controlling the electromagnetic cylinder 52 to perform a contraction movement. The electromagnetic sensor 53 contracts to positions of 220mm, 440mm, 660mm, 880mm, and 1160mm respectively. The electromagnetic cylinder 52 drives the two screen shafts 3 on both sides to move towards the middle, and at the same time pulls the steel plate push-pull frame 10, pulling the telescopic steel plate 9 to a position 80mm away from the left and right outermost screen shafts 3. At this time, the screen hole diameter is adjusted to 80mm.

[0049] When the working face passes through a fault, the control electromagnetic cylinder 52 continues to contract, further reducing the aperture of the screen shaft 3 until the electromagnetic sensor 53 moves to the control cylinder contraction positions of 55mm, 110mm, 165mm, 220mm, and 275mm respectively. At the same time, the lowest electromagnetic cylinder 52 pulls the steel plate push-pull frame 10, pulling the telescopic steel plate 9 to a position 25mm away from the left and right outermost screen shafts 3. At this time, the screen aperture is adjusted to 25mm, and all coal and gangue larger than 25mm are connected to the dry separation system for sorting using the transfer equipment.

Claims

1. A method for using a screening device with variable screen aperture, characterized in that, The variable screen aperture screening device includes a frame (1) and a support (2) supporting the frame (1). The frame (1) is characterized in that a plurality of screen shafts (3) are evenly arranged inside the frame (1). The two ends of the screen shafts (3) are movably connected to the frame (1), and one end of the screen shafts (3) is provided with a motor (4) for driving the screen shafts (3) to rotate. The extension direction of the screen shafts (3) is perpendicular to the feeding direction. The screen shafts (3) are connected to a power device (5). The power device (5) is used to control the screen shafts (3) to slide relative to the frame (1) to adjust the screen aperture. The frame (1) is provided with slide rails (8) on both sides. The slide rails (8) are provided with bearings (6) corresponding to the screen shaft (3). The two ends of the screen shaft (3) are respectively connected to the bearings (6) provided on the opposite sides. The bearings (6) are connected to bearing fixing devices (7) on the outside. The bearing fixing devices (7) are movably connected to the slide rails (8). The power unit (5) includes a plurality of electromagnetic cylinders (52) arranged in a mirror image of the center line of the vertical frame (1). The electromagnetic cylinders (52) extend in a direction perpendicular to the screen shaft (3), and the length of the plurality of electromagnetic cylinders (52) gradually increases in a direction away from the frame (1). One end of the electromagnetic cylinder (52) is fixed, and the other end is connected to the corresponding bearing fixing device (7). The electromagnetic cylinder (52) is connected in sequence to the electromagnetic valve (54) and the air pump (51) that control the extension and retraction of the electromagnetic cylinder (52) through the air pipe (56). An electromagnetic sensor (53) is connected to the electromagnetic cylinder (52), and a scale line is also provided on the outside of the electromagnetic cylinder (52). The extension and retraction distance of the electromagnetic cylinder (25) is controlled by the electromagnetic sensor (53) and the scale line. The length difference between adjacent electromagnetic cylinders (52) is equal; A solenoid valve switch (55) is provided on the solenoid valve (54); The electromagnetic cylinder (52) furthest from the frame (1) is connected to a steel plate push-pull frame (10), and the steel plate push-pull frame (10) is connected to a telescopic steel plate (9). The telescopic steel plate (9) is laid flat on the frame (1), and the telescopic steel plate (9) moves synchronously with the adjustment of the sieve hole diameter. Includes the following steps: Step 1: Start the motor (4) to drive the screen shaft (3) to rotate, run the power device (5), and the electromagnetic cylinder (52) to stretch and drive the screen shaft (3) to move to both sides. Adjust the screen hole diameter to the maximum, and the telescopic steel plate (9) moves to the retracted state with the electromagnetic cylinder (52). Step 2, the coal quantity tends to be stable, the power device (5) is operated, the electromagnetic cylinder (52) is contracted to drive the two screen shafts (3) to converge towards the middle, the screen hole diameter is adjusted according to the coal quantity, and the telescopic steel plate (9) moves to the stretched state with the electromagnetic cylinder (52). Step 3: When the working face passes through the geological fracture zone, the power unit (5) is activated and the electromagnetic cylinder (52) is contracted to drive the two screen shafts (3) to converge towards the middle, adjust the screen hole diameter to the minimum value, and the telescopic steel plate (9) moves to the maximum tension state with the electromagnetic cylinder (52). Step 4: After passing through the geological fracture zone, run the power unit (5) to adjust the screen shaft (3) to the state in step 2.

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