Adjustable vibrating screen for underground coal mine

Abstract

The utility model provides an adjustable vibrating screen for an underground coal mine, which can realize multi-parameter adjustment. The vibration intensity of the vibrating screen can be changed through the vibrating motor, different drilling conditions can be met, adjustment can be conducted in a self-adaptive mode by changing the angle of the screen mesh, the adjusting range of the vibrating screen is enlarged, the vibrating screen can meet various drilling construction working conditions of an underground coal mine, and the vibrating screen is suitable for industrial large-scale use and popularization.

Description

Technical Field

[0001] The utility model belongs to the technical field of drilling, in particular to an adjustable vibrating screen used in underground coal mines. Background Art

[0002] The hardness coefficients of the target coal and rock formations involved in near-horizontal drilling in underground coal mines vary widely, ranging from limestone and quartz sandstone with a Proctor hardness coefficient (f) exceeding 10, to very soft coal seams (usually with an f coefficient less than 3), and to medium-hardness waste rock layers (with an f coefficient somewhere between coal seams and rock seams). Drilling into hard rock requires the bottomhole drill bit to operate at high power and torque, resulting in a high mud pump output and a relatively low solids content in the returned flushing fluid. However, when drilling into coal seams, the mud pump output can be reduced to save overall costs, and the drilling speed is much faster than that of drilling into hard rock, while also returning a large amount of coal slag. The drilling speed for waste rock layers is somewhere in between.

[0003] The application of vibrating screens in underground coal mine drilling enables underground coal mine drilling water to be recycled to a certain extent, and can also reduce waste slurry pollution, partially solving the problem of water shortage in underground coal mines. Therefore, it is increasingly used in underground coal mines. However, currently underground coal mines all use vibrating screens with fixed performance parameters, which have a limited adjustment range and cannot cope with various drilling conditions. Utility Model Content

[0004] The purpose of the utility model is to provide an adjustable vibrating screen for use in coal mines, so as to solve the problem that the vibrating screen in the prior art has a limited adjustment range and cannot cope with various drilling conditions.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] An adjustable vibrating screen for use in underground coal mines comprises a base, a screen box assembly and a liquid distribution device are provided on the base, and the liquid distribution device is located above the screen box assembly;

[0007] The screen box assembly includes a screen box arranged on a base; a side plate of the screen box close to the liquid distribution device is an adjustment plate, and a plurality of vertically distributed through holes are opened in the middle of the adjustment plate, and a through channel is provided between two adjacent holes;

[0008] A support bracket is rotatably mounted inside the screening box, and a screw rod is connected to the side wall of the support bracket close to the liquid distributing device; the screw rod can pass through the channel between any two adjacent clamping holes as the support bracket rotates; a buckle is slidably provided on the screw rod, and the buckle can be clamped into the inside of the clamping hole;

[0009] The upper surface of the support frame is paved with a screen, and the screening box is also provided with a vibration motor.

[0010] The utility model also has the following features:

[0011] Furthermore, a plurality of spring seats are evenly distributed on the base, and an exciting spring is provided on each spring seat; a spring upper bracket is provided at a corresponding position on the outer wall of the screening box, and the top end of each exciting spring is connected to the bottom end of the spring upper bracket in a one-to-one correspondence;

[0012] A plurality of fixing plates are also provided on the base; the fixing plates are connected to corresponding positions of the outer wall of the screening box through connecting pieces.

[0013] Furthermore, the support frame includes two transverse beams and a plurality of longitudinal beams;

[0014] A rotating shaft is provided inside the screening box, and both ends of the rotating shaft are fixedly connected to two opposite inner walls of the screening box respectively;

[0015] The plurality of longitudinal beams are evenly distributed between the two transverse beams, a rotating plate is provided in the middle of the bottom surface of each longitudinal beam, and all the rotating plates are provided with rotating holes;

[0016] The rotating shaft passes through the rotating hole of each rotating plate in sequence.

[0017] Furthermore, the adjustment plate is a curved plate;

[0018] The curvature of the adjustment plate matches the curvature of the motion track formed when the crossbeam of the support bracket rotates.

[0019] Furthermore, the liquid distributing device includes a liquid distributing box;

[0020] The liquid distribution box is installed on the base through a bracket.

[0021] Furthermore, liquid inlet pipes are provided on both opposite side walls of the liquid distribution box, and a negative pressure suction joint is provided on the top plate of the liquid distribution box;

[0022] The bottom plate of the liquid distribution box is provided with a liquid outlet, and the liquid outlet is located on the upper part of the screen.

[0023] Furthermore, the liquid inlet pipe, the negative pressure suction joint and the bracket are all connected to the liquid distribution box by welding.

[0024] Furthermore, the liquid outlet is in a strip shape.

[0025] Compared with the prior art, the present invention has the following technical effects:

[0026] The adjustable vibrating screen for underground coal mines of the utility model can realize multi-parameter adjustment. Not only can the vibration intensity of the vibrating screen be changed by the vibrating motor, but also it can cope with different drilling conditions, that is, it can adaptively adjust by changing the angle of the screen, thereby increasing the adjustment range of the vibrating screen, so that the vibrating screen can meet various drilling construction conditions in underground coal mines, and is suitable for large-scale use and promotion in industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of the adjustable vibrating screen for underground coal mines of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the screening box in the utility model;

[0029] Figure 3 It is a schematic diagram of the base structure in the utility model;

[0030] Figure 4 This is a schematic diagram of the support structure in the utility model;

[0031] Figure 5 This is a schematic structural diagram of the liquid distribution box in the utility model;

[0032] Figure 6-8 This is a schematic diagram of the rotation of the support bracket in the embodiment of the present utility model;

[0033] Figure 9 This is a schematic diagram of the structure of the screening box in the utility model;

[0034] Figure 10 This is a structural diagram of the screening box in the present invention from another angle;

[0035] Figure 11 It is a schematic diagram of the screen structure in the utility model;

[0036] Figure 12 It is a structural diagram of the vibration motor in the utility model.

[0037] The meaning of each number in the figure is:

[0038] 1. Base; 2. Screen box; 3. Adjustment plate; 4. Clamp hole; 5. Support bracket; 6. Screw rod; 7. Buckle; 8. Screen; 9. Vibration motor; 10. Spring seat; 11. Excitation spring; 12. Spring upper bracket; 13. Fixed plate; 14. Connector; 15. Crossbeam; 16. Longitudinal beam; 17. Rotating shaft; 18. Rotating plate; 19. Rotating hole; 20. Liquid distribution box; 21. Bracket; 22. Liquid inlet pipe; 23. Negative pressure suction joint; 24. Liquid outlet. DETAILED DESCRIPTION

[0039] It should be noted that, unless otherwise specified, all components in the present invention are components known in the prior art. For example, the vibration motor is a known and commonly used vibration motor.

[0040] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the scope of protection of the present invention.

[0041] like Figure 1 and 2 As shown, the adjustable vibrating screen for underground coal mines provided by the present invention comprises a base 1 , on which a screen box assembly and a liquid distribution device are provided, and the liquid distribution device is located above the screen box assembly.

[0042] The screen box assembly includes a screen box 2 arranged on a base 1; a side panel of the screen box 2 close to the liquid distribution device is an adjustment plate 3, and a plurality of vertically distributed through-holes 4 are opened in the middle of the adjustment plate 3, and a through-channel is provided between two adjacent holes 4.

[0043] A support bracket 5 is rotatably installed inside the screening box 2, and a screw rod 6 is connected to the side wall of the support bracket 5 close to the liquid distribution device; the screw rod 6 can pass through the channel between any two adjacent clamping holes 4 as the support bracket 5 rotates; a buckle 7 is slidably provided on the screw rod 6, and the buckle 7 can be clamped into the inside of the clamping hole 4.

[0044] A screen 8 is laid on the upper surface of the support frame 5 , and a vibration motor 9 is also provided on the screening box 2 .

[0045] As a preferred solution, the adjustment plate 3 is an arc-shaped plate.

[0046] The curvature of the adjusting plate 3 matches the curvature of the motion track formed when the crossbeam 15 of the supporting bracket 5 rotates, ensuring that the supporting bracket 5 fits the inner wall of the adjusting plate 3 when rotating.

[0047] In actual use, since the support bracket 5 itself is rotatable, it can drive the screw rod 6 to rotate, thereby enabling the angle of the screen 8 to be adjusted.

[0048] When fixing is required, since the buckle 7 is slidably arranged on the screw rod 6, it is only necessary to slide the buckle 7 into the clamping hole 4 to achieve fixing.

[0049] Similarly, when readjustment is required, just slide out the buckle 7 and readjust.

[0050] As a preferred solution, Figure 5 As shown, the liquid distributing device includes a liquid distributing box 20 ; the liquid distributing box 20 is installed on the base 1 through a bracket 21 .

[0051] Liquid inlet pipes 22 are provided on opposite side walls of the liquid distribution box 20 , and a negative pressure suction joint 23 is provided on the top plate of the liquid distribution box 20 .

[0052] A liquid outlet 24 is provided on the bottom plate of the liquid distribution box 20 , and the liquid outlet 24 is located above the screen 8 .

[0053] As a preferred solution, the liquid inlet pipe 22, the negative pressure suction joint 23 and the bracket 21 are all connected to the liquid distribution box 20 by welding.

[0054] More preferably, the liquid outlet 24 is in the shape of an elongated strip.

[0055] During field use, the borehole flushing fluid, after returning from the orifice, is directed through an external orifice assembly to a liquid inlet pipe 22. There is one inlet pipe 22 on each side, and for ease of connection, one inlet pipe 22 is connected to the orifice assembly while the other is sealed with a blind flange. The downhole negative pressure suction line is connected to a negative pressure suction connector 23 to prevent gas returning from the borehole from escaping into the air and causing accidents such as gas over-limit. The bottom outlet 24 is designed as an elongated strip to evenly distribute the flushing fluid, carrying solid particles, across the screen.

[0056] The specific workflow of this embodiment is given below, which is divided into the following situations:

[0057] Before drilling, connect the orifice device to the liquid inlet pipe 22, seal the liquid inlet pipe 22 on the other side with a flange blind plate, connect the negative pressure suction pipeline to the negative pressure suction joint 23, and then start formal construction. When the external mud pump is turned on, the screen box assembly is started at the same time. When drilling is stopped, the screen box assembly is shut down after the flushing liquid returned from the orifice has flowed out.

[0058] During normal drilling construction:

[0059] When drilling into hard rock formations, the flow of the returned flushing fluid is large, the solid particles are small in size and content is low. At this time, a screen with a small mesh size should be selected, and the screen support bracket should be tilted at a certain negative angle toward the slag outlet of the screen box (such as Figure 6 As shown), the vibration motor 9 is shifted to low speed, with no pulp leakage as the adjustment standard.

[0060] A further option is given below: the sieve 8 uses a small-aperture sieve of 120 mesh or more.

[0061] When drilling into the gangue layer:

[0062] The amount of flushing liquid returned is medium, the relative particle size of solid particles increases, and the content increases. At this time, a medium-sized mesh screen 8 should be selected, and the support frame 5 is at a nearly horizontal angle relative to the slag outlet of the screen box (such as Figure 7 As shown), the vibration motor 9 is adjusted to the medium speed gear, with no pulp running as the adjustment standard.

[0063] A further option is given below: the screen 8 uses a medium aperture screen of 60 to 120 meshes.

[0064] When drilling into a coal seam:

[0065] The amount of flushing liquid returned is relatively small, the solid particles are relatively large and the content is high. At this time, a large-mesh screen 8 should be selected, and the support frame 5 should be tilted at a certain positive angle toward the slag outlet of the screen box (such as Figure 8 As shown), the vibration motor 9 is adjusted to high speed, with no pulp leakage as the adjustment standard.

[0066] A further option is given below: the screen 8 uses a medium aperture screen of 20 to 60 meshes.

[0067] It should be noted that, in addition to the specific aperture selection of the screen 8, the adjustment of the angle of the screen 8 and the gear position of the vibration motor 9 are contents independently confirmed by technical personnel in this field based on the actual situation on site. The low, medium and high gears of the vibration motor 9 here are only basic descriptions of the vibration intensity, not absolute limitations, and will not be elaborated on.

[0068] As a preferred solution, Figure 1 and 3 As shown, a plurality of spring seats 10 are evenly distributed on the base 1, and each spring seat 10 is provided with an exciting spring 11; a spring upper bracket 12 is provided at the corresponding position of the side wall of the screening box 2, and the top of each exciting spring 11 is connected to the spring upper bracket 12 one by one.

[0069] A plurality of fixing plates 13 are further provided on the base 1 ; the fixing plates 13 are connected to corresponding positions of the side walls of the screening box 2 via connecting members 14 .

[0070] The exciting spring 11 is a rubber composite spring (a steel spring wrapped in rubber), but it can also be an ordinary steel spring.

[0071] In this embodiment, two fixing plates 13 are provided and four spring seats 10 are provided; when in use, the spring seats 10 assist the vibration of the screening box 2. When the variable vibration motor 9 is working, it cooperates with the exciting spring 11 to make the screening box 2 generate periodic vibration.

[0072] The fixing plate 13 and the connecting member 14 play a basic fixing role to protect the excitation spring 11 during transportation.

[0073] As a preferred solution, Figure 4 As shown, the support bracket 5 includes two transverse beams 15 and a plurality of longitudinal beams 16 .

[0074] A rotating shaft 17 is provided inside the screening box 2 , and both ends of the rotating shaft 17 are fixedly connected to two opposite inner walls of the screening box 2 respectively.

[0075] Multiple longitudinal beams 16 are evenly distributed between the two transverse beams 15. A rotating plate 18 is provided in the middle of the bottom surface of each longitudinal beam 16. All rotating plates 18 are provided with rotating holes 19; the rotating shaft 17 passes through the rotating hole 19 of each rotating plate 18 in turn to realize the rotation of the support bracket 5.

Claims

1. An adjustable vibrating screen for use in underground coal mines, characterized in that: It comprises a base (1), wherein a screen box assembly and a liquid distribution device are provided on the base (1), and the liquid distribution device is located above the screen box assembly; The screen box assembly comprises a screen box (2) arranged on a base (1); a side plate of the screen box (2) close to the liquid distribution device is an adjustment plate (3); a plurality of vertically distributed through-holes (4) are provided in the middle of the adjustment plate (3); a through-channel is provided between two adjacent through-holes (4); A support bracket (5) is rotatably mounted inside the screening box (2), and a screw rod (6) is connected to the side wall of the support bracket (5) close to the liquid distributing device; the screw rod (6) can pass through the channel between any two adjacent clamping holes (4) as the support bracket (5) rotates; a buckle (7) is slidably provided on the screw rod (6), and the buckle (7) can be clamped into the inside of the clamping hole (4); The upper surface of the support frame (5) is paved with a screen (8), and the screening box (2) is also provided with a vibration motor (9).

2. The adjustable vibrating screen for underground coal mines according to claim 1, characterized in that: A plurality of spring seats (10) are evenly distributed on the base (1), and an excitation spring (11) is provided on each spring seat (10); a spring upper bracket (12) is provided at a corresponding position on the outer wall of the screening box (2), and the top end of each of the excitation springs (11) is connected to the bottom end of the spring upper bracket (12) in a one-to-one correspondence; A plurality of fixing plates (13) are also provided on the base (1); the fixing plates (13) are connected to corresponding positions of the outer wall of the screening box (2) via connecting pieces (14).

3. The adjustable vibrating screen for underground coal mines according to claim 1, characterized in that: The support frame (5) includes two transverse beams (15) and a plurality of longitudinal beams (16); A rotating shaft (17) is provided inside the screening box (2), and both ends of the rotating shaft (17) are fixedly connected to two opposite inner walls of the screening box (2); The plurality of longitudinal beams (16) are evenly distributed between the two transverse beams (15), a rotating plate (18) is provided in the middle of the bottom surface of each longitudinal beam (16), and all the rotating plates (18) are provided with rotating holes (19); The rotating shaft (17) passes through the rotating hole (19) of each rotating plate (18) in sequence.

4. The adjustable vibrating screen for underground coal mines according to claim 3, characterized in that: The regulating plate (3) is a curved plate; The curvature of the adjustment plate (3) matches the curvature of the motion trajectory formed when the crossbeam (15) of the support frame (5) rotates.

5. The adjustable vibrating screen for underground coal mines according to claim 1, characterized in that: The liquid distributing device comprises a liquid distributing box (20); The liquid distributing box (20) is mounted on the base (1) via a bracket (21).

6. The adjustable vibrating screen for underground coal mines according to claim 5, characterized in that: Liquid inlet pipes (22) are provided on opposite side walls of the liquid distributing box (20), and a negative pressure suction joint (23) is provided on the top plate of the liquid distributing box (20); A liquid outlet (24) is provided on the bottom plate of the liquid distribution box (20), and the liquid outlet (24) is located above the screen (8).

7. The adjustable vibrating screen for underground coal mines according to claim 6, characterized in that: The liquid inlet pipe (22), the negative pressure suction joint (23), the bracket (21) and the liquid distribution box (20) are all connected by welding.

8. The adjustable vibrating screen for underground coal mines according to claim 7, characterized in that: The liquid outlet (24) is in a strip shape.

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