A reverse circulation drilling equipment and drilling technology for soft and outburst-prone coal seams

Abstract

The present invention discloses a reverse circulation drilling device and a drilling process for soft and collapsing outburst coal seams. The technical solution is as follows: It includes a box body, and a drilling mechanism is arranged inside the box body, and the drilling mechanism extends outside the box body; the drilling mechanism includes a fixed box, the fixed box is fixedly arranged outside the box body, a motor is arranged on one side of the box body, the motor is fixedly connected with a rotating rod through an output shaft, the rotating rod is arranged on one side of the box body and extends into the box body, and a first screw rod is fixedly arranged on one side of the rotating rod. The beneficial effect of the present invention is that through the design of the drilling mechanism, it is convenient to release the gas in the coal seam. At the same time, through the design of multiple fan blades, the gas in the coal seam can be inhaled into the connecting cylinder, and the gas in the coal seam is discharged through the exhaust pipe, avoiding the phenomenon of gas outburst caused by a large amount of gas accumulation in the coal seam, ensuring the safety of the operator and facilitating the use of the user.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling equipment, and particularly relates to a reverse circulation drilling equipment and drilling process for soft and collapsing outburst coal seams. Background Art

[0002] Drilling is an operation in engineering that uses a drill bit to work at the bottom of a hole (well), break rocks or other media, and form and deepen the borehole. Soft outburst coal seams account for a large proportion of the recoverable coal seams in China. When drilling in soft outburst coal seams, especially in areas with high in-situ stress, phenomena such as hole spraying, hole collapse, and drill sticking are likely to occur, resulting in low hole formation rate, shallow hole formation depth, and difficult drilling construction.

[0003] The existing technology has the following deficiencies: When the existing drilling equipment is in use, due to the blockage of the hole wall gap caused by hole collapse and diameter reduction, it is impossible to immediately dredge the upward return channel even with a spiral drill pipe. Once a large amount of gas is released in the coal seam, it will accumulate at the blocked place. When the gas release amount and release pressure reach a certain level, the hole spraying phenomenon will be inevitable, posing a certain safety hazard to the operator.

[0004] Therefore, it is very necessary to invent a reverse circulation drilling equipment and drilling process for soft and collapsing outburst coal seams. Summary of the Invention

[0005] To achieve the above object, the present invention provides the following technical solutions: A reverse circulation drilling equipment and drilling process for soft and collapsing outburst coal seams, including a box body, wherein a drilling mechanism is arranged inside the box body, and the drilling mechanism extends out of the box body;

[0006] The drilling mechanism includes a fixed box, the fixed box is fixedly arranged outside the box body, a motor is arranged on one side of the box body, the motor is fixedly connected with a rotating rod through an output shaft, the rotating rod is arranged on one side of the box body and extends into the box body, a first screw rod is fixedly arranged on one side of the rotating rod, the first screw rod extends out of the box body on one side, a filter screen is inlaid on one side of the box body, a drill bit is fixedly arranged outside the first screw rod, a discharge hopper is fixedly arranged at the bottom of the box body, an auxiliary component is arranged outside the box body, and a ventilation component is arranged outside the fixed box.

[0007]

[0008] ​The auxiliary component includes a circular plate, the circular plate is fixedly arranged outside the first screw rod, a plurality of knocking plates are fixedly arranged outside the circular plate, a plurality of cross plates are arranged inside the box body, a plurality of moving rods are fixedly arranged on the top of the cross plates, the moving rods penetrate through the box body and the fixed box and extend outside the fixed box, a plurality of springs are fixedly arranged on the top of the box body, and a connecting plate is fixedly arranged outside a plurality of the moving rods, and the top of the spring is fixedly connected with the bottom of the connecting plate;

[0009] The drilling mechanism further includes a support component, the support component includes a protection box, the motor is fixedly arranged inside the protection box, and a plurality of heat dissipation holes are formed in the protection box.

[0010] Preferably, the ventilation component includes a first bevel gear, the first bevel gear is fixedly arranged outside the rotating rod, a second bevel gear is arranged on the top of the first bevel gear, the first bevel gear is meshed with the second bevel gear, a connecting rod is arranged on the top of the second bevel gear, a connecting cylinder is fixedly arranged on the top of the box body, the top of the connecting rod is connected with the top of the inner cavity of the connecting cylinder through a bearing, a third bevel gear is fixedly arranged outside the connecting rod, a fourth bevel gear is arranged on one side of the third bevel gear, a connecting rod is fixedly arranged on one side of the fourth bevel gear, a plurality of fan blades are fixedly arranged outside the connecting rod, and one end of the connecting rod is connected with one side wall of the connecting cylinder through a bearing.

[0011] Preferably, a connecting box is fixedly arranged outside the fixed box, the top of the connecting box is fixedly connected with the connecting cylinder, a plurality of support plates are fixedly arranged inside the connecting cylinder, the support plates are connected with the connecting rod through bearings, and an air outlet pipe is fixedly arranged on the top of the connecting cylinder.

[0012] Preferably, the drilling mechanism further includes a fifth bevel gear, the fifth bevel gear is fixedly arranged outside the rotating rod, a sixth bevel gear is arranged on the bottom of the fifth bevel gear, the sixth bevel gear is meshed with the fifth bevel gear, a second screw rod is fixedly arranged on the bottom of the fifth bevel gear, the second screw rod extends out of the bottom of the discharge hopper, and the second screw rod is connected with the discharge hopper through a bearing.

[0013] Preferably, a partition board is fixedly arranged inside the box body, and the partition board is connected with the first screw rod through a bearing.

[0014] Preferably, a protection box is fixedly arranged inside the box body, the first bevel gear, the second bevel gear, the fifth bevel gear and the sixth bevel gear are all arranged inside the protection box, and the connecting rod and the second screw rod are both connected with the protection box through bearings.

[0015] Preferably, the support component includes a fixing plate, the fixing plate is fixedly arranged on one side of the box body, the top of the fixing plate is fixedly connected with the bottom of the motor, and an inclined plate is fixedly arranged on the bottom of the fixing plate, and one side of the inclined plate is fixedly connected with one side of the box body.

[0016] The specific steps of the drilling process are as follows:

[0017] S1 Start-up: First, the present invention is connected to an external power source, then the motor is started, and the drill bit is aligned with the coal seam. The motor drives the rotating rod to rotate, the rotation of the rotating rod drives the first screw rod to rotate, the rotation of the first screw rod can drive the drill bit to rotate, and the rotation of the drill bit can drill into the coal seam. At the same time, larger coal blocks can be broken, and then the coal can be input into the box through the first screw rod.

[0018] S2 Air permeability: While the rotating rod rotates, it will also drive the circular plate to rotate. The rotation of the circular plate drives the multiple knocking plates outside the circular plate to rotate. The rotation of the knocking plates can knock on the cross plate. Through the design of the spring, the cross plate and the moving rod can move up and down continuously. Through the movement of the moving rod, the gas in the coal seam can enter the fixed box through the holes after the movement of the moving rod.

[0019] S3 Ventilation: While the rotating rod rotates, it will also drive the first bevel gear to rotate. The rotation of the first bevel gear drives the second bevel gear to rotate. The rotation of the second bevel gear drives the connecting rod to rotate. The rotation of the connecting rod drives the third bevel gear to rotate. The rotation of the third bevel gear drives the connecting rod to rotate. The rotation of the connecting rod drives the multiple fan blades outside the connecting rod to rotate. The rotation of the multiple fan blades can generate suction, and then the gas in the coal seam can be sucked into the connecting cylinder and discharged through the air outlet pipe.

[0020] S4 Material guiding: While the rotating rod rotates, it will also drive the fifth bevel gear to rotate. The rotation of the fifth bevel gear drives the sixth bevel gear to rotate. The rotation of the sixth bevel gear drives the second screw rod to rotate. The rotation of the second screw rod can conduct the coal, so that the coal can be discharged through the discharge hopper.

[0021] The beneficial effects of the present invention are:

[0022] 1. Through the design of the drilling mechanism, the box can enter the coal seam, and at the same time, the coal blocks can be broken. And through the mutual cooperation of the first screw rod and the second screw rod, the coal can be transported to the outside of the box. At the same time, through the design of the moving rod, holes can be drilled in the coal seam to facilitate the release of the gas in the coal seam. At the same time, through the design of multiple fan blades, the gas in the coal seam can be sucked into the connecting cylinder and the gas in the coal seam can be discharged through the exhaust pipe, avoiding the phenomenon of gas spraying caused by the large accumulation of gas in the coal seam, ensuring the safety of the operator and facilitating the use of the user.

[0023] Through the design of the support assembly, the present invention can support the motor and is also convenient for the installation of the motor, ensuring the normal use of the motor and also ensuring the normal use of the present invention. Description of the Drawings

[0024] Figure 1Schematic diagram of the overall structure provided by the present invention;

[0025] Figure 2 Provided by the present invention Figure 1 Enlarged view of part A in

[0026] Figure 3 Provided by the present invention Figure 1 Enlarged view of part B in

[0027] Figure 4 Three-dimensional view of the circular plate provided by the present invention;

[0028] Figure 5 Cross-sectional view of Embodiment 2 provided by the present invention;

[0029] In the figure: 1 box body, 2 fixed box, 3 motor, 4 rotating rod, 5 first screw rod, 6 filter screen, 7 drill bit, 8 discharge hopper, 9 circular plate, 10 knocking plate, 11 cross plate, 12 moving rod, 13 spring, 14 connecting plate, 15 protective box, 16 heat dissipation hole, 17 first bevel gear, 18 second bevel gear, 19 connecting rod, 20 connecting cylinder, 21 third bevel gear, 22 fourth bevel gear, 23 connecting rod, 24 fan blade, 25 connecting box, 26 support plate, 27 air outlet pipe, 28 fifth bevel gear, 29 sixth bevel gear, 30 second screw rod, 31 partition plate, 32 protection box, 33 fixing plate, 34 inclined plate. Specific embodiments

[0030] The following is a description of the preferred embodiments of the present invention with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0031] Embodiment 1, referring to the attached Figures 1-4 , a reverse circulation drilling device and drilling process for soft and collapsed outburst coal seams provided by the present invention, including a box body 1, a drilling mechanism is arranged inside the box body 1, and the drilling mechanism extends outside the box body 1.

[0032] The drilling mechanism includes a fixed box 2, the fixed box 2 is fixedly arranged outside the box body 1, a motor 3 is arranged on one side of the box body 1, the motor 3 is fixedly connected with a rotating rod 4 through an output shaft, the rotating rod 4 is arranged on one side of the box body 1 and extends into the box body 1, a first screw rod 5 is fixedly arranged on one side of the rotating rod 4, the first screw rod 5 extends outside the box body 1 on one side, a filter screen 6 is embedded on one side of the box body 1, a drill bit 7 is fixedly arranged outside the first screw rod 5, a discharge hopper 8 is fixedly arranged at the bottom of the box body 1, an auxiliary component is arranged outside the box body 1, and a ventilation component is arranged outside the fixed box 2.

[0033] The auxiliary component includes a circular plate 9 which is fixedly arranged outside the first screw rod 5. A plurality of knocking plates 10 are fixedly arranged outside the circular plate 9. A plurality of cross plates 11 are arranged inside the box body 1. A plurality of moving rods 12 are fixedly arranged on the top of the cross plates 11. The moving rods 12 penetrate through the box body 1 and the fixed box 2 and extend outside the fixed box 2. A plurality of springs 13 are fixedly arranged on the top of the box body 1. A connecting plate 14 is fixedly arranged on the outside of the plurality of moving rods 12. The top of the spring 13 is fixedly connected with the bottom of the connecting plate 14;

[0034] The drilling mechanism further includes a support component. The support component includes a protection box 15. The motor 3 is fixedly arranged inside the protection box 15. A plurality of heat dissipation holes 16 are formed in the protection box 15.

[0035] Further, the ventilation component includes a first bevel gear 17 which is fixedly arranged on the outside of the rotating rod 4. A second bevel gear 18 is arranged on the top of the first bevel gear 17. The first bevel gear 17 meshes with the second bevel gear 18. A connecting rod 19 is arranged on the top of the second bevel gear 18. A connecting cylinder 20 is fixedly arranged on the top of the box body 1. The top of the connecting rod 19 is connected with the top inner cavity of the connecting cylinder 20 through a bearing. A third bevel gear 21 is fixedly arranged on the outside of the connecting rod 19. A fourth bevel gear 22 is arranged on one side of the third bevel gear 21. A connecting rod 23 is fixedly arranged on one side of the fourth bevel gear 22. A plurality of fan blades 24 are fixedly arranged on the outside of the connecting rod 23. One end of the connecting rod 23 is connected with one side wall of the connecting cylinder 20 through a bearing, which is convenient for sucking out gas.

[0036] Further, a connecting box 25 is fixedly arranged outside the fixed box 2. The top of the connecting box 25 is fixedly connected with the connecting cylinder 20. A plurality of support plates 26 are fixedly arranged inside the connecting cylinder 20. The support plates 26 are connected with the connecting rod 23 through bearings. An air outlet pipe 27 is fixedly arranged on the top of the connecting cylinder 20, which is convenient for supporting the connecting rod 23.

[0037] Further, the drilling mechanism further includes a fifth bevel gear 28 which is fixedly arranged on the outside of the rotating rod 4. A sixth bevel gear 29 is arranged on the bottom of the fifth bevel gear 28. The sixth bevel gear 29 meshes with the fifth bevel gear 28. A second screw rod 30 is fixedly arranged on the bottom of the fifth bevel gear 28. The second screw rod 30 extends out of the bottom of the discharge hopper 8. The second screw rod 30 is connected with the discharge hopper 8 through a bearing.

[0038] Further, a partition plate 31 is fixedly arranged inside the box body 1. The partition plate 31 is connected with the first screw rod 5 through a bearing.

[0039] Further, a protective box 32 is fixedly arranged inside the box body 1. The first bevel gear 17, the second bevel gear 18, the fifth bevel gear 28 and the sixth bevel gear 29 are all arranged inside the protective box 32. The connecting rod 19 and the second screw rod 30 are both connected to the protective box 32 through bearings.

[0040] The specific steps of the drilling process are as follows:

[0041] S1 Start-up: First, the present invention is connected to an external power supply, then the motor 3 is started, and the drill bit 7 is aligned with the coal seam. The motor 3 works to drive the rotating rod 4 to rotate. The rotating rod 4 rotates to drive the first screw rod 5 to rotate. The rotation of the first screw rod 5 can drive the drill bit 7 to rotate. The rotation of the drill bit 7 can drill into the coal seam, and at the same time, larger coal blocks can be broken. Then, the coal can be input into the box body 1 through the first screw rod 5.

[0042] S2 Air permeability: While the rotating rod 4 rotates, it will also drive the circular plate 9 to rotate. The rotation of the circular plate 9 drives the multiple percussion plates 10 outside the circular plate 9 to rotate. The rotation of the percussion plates 10 can strike the cross plate 11. Through the design of the spring 13, the cross plate 11 and the moving rod 12 can move up and down continuously. Through the movement of the moving rod 12, the gas in the coal seam can enter the fixed box 2 through the holes after the movement of the moving rod 12.

[0043] S3 Ventilation: While the rotating rod 4 rotates, it will also drive the first bevel gear 17 to rotate. The rotation of the first bevel gear 17 drives the second bevel gear 18 to rotate. The rotation of the second bevel gear 18 drives the connecting rod 19 to rotate. The rotation of the connecting rod 19 drives the third bevel gear 21 to rotate. The rotation of the third bevel gear 21 drives the connecting rod 23 to rotate. The rotation of the connecting rod 23 drives the multiple fan blades 24 outside the connecting rod 23 to rotate. The rotation of the multiple fan blades 24 can generate suction, and then the gas in the coal seam can be sucked into the connecting cylinder 20 and discharged through the air outlet pipe 27.

[0044] S4 Material guiding: While the rotating rod 4 rotates, it will also drive the fifth bevel gear 28 to rotate. The rotation of the fifth bevel gear 28 drives the sixth bevel gear 29 to rotate. The rotation of the sixth bevel gear 29 drives the second screw rod 30 to rotate. The rotation of the second screw rod 30 can conduct the coal, so that the coal can be discharged through the discharge hopper 8.

[0045] Embodiment 2, referring to the attached Figure 5 , a reverse circulation drilling device and drilling process for soft and collapsing outburst coal seams provided by the present invention. The support assembly includes a fixing plate 33. The fixing plate 33 is fixedly arranged on one side of the box body 1. The top of the fixing plate 33 is fixedly connected to the bottom of the motor 3. The bottom of the fixing plate 33 is fixedly provided with an inclined plate 34. One side of the inclined plate 34 is fixedly connected to one side of the box body 1.

[0046] The usage process of the present invention is as follows: When using the present invention, through the design of the support component, the motor 3 can be supported, and at the same time, it is also convenient for the installation of the motor 3, ensuring the normal use of the motor 3 and also ensuring the normal use of the present invention.

[0047] The above are only the preferred embodiments of the present invention. Any person skilled in the art may modify the present invention by using the technical solutions described above or modify it into equivalent technical solutions. Therefore, any simple modification or equivalent replacement made according to the technical solutions of the present invention falls within the scope of protection required by the present invention.

Claims

1. A reverse circulation drilling device for soft and collapsing outburst coal seams, comprising a box body (1), characterized in that: Inside the box body (1), a drilling mechanism is provided, and the drilling mechanism extends outside the box body (1). The drilling mechanism includes a fixed box (2), the fixed box (2) is fixedly arranged outside the box body (1), a motor (3) is arranged on one side of the box body (1), the motor (3) is fixedly connected with a rotating rod (4) through an output shaft, the rotating rod (4) is arranged on one side of the box body (1) and extends into the box body (1) internally, a first screw rod (5) is fixedly arranged on one side of the rotating rod (4), the first screw rod (5) extends outside the box body (1) on one side, a filter screen (6) is embedded on one side of the box body (1), a drill bit (7) is fixedly arranged on the outside of the first screw rod (5), a discharge hopper (8) is fixedly arranged at the bottom of the box body (1), an auxiliary component is arranged outside the box body (1), and a ventilation component is arranged outside the fixed box (2). The auxiliary component includes a circular plate (9), the circular plate (9) is fixedly arranged on the outside of the first screw rod (5), a plurality of knocking plates (10) are fixedly arranged on the outside of the circular plate (9), a plurality of cross plates (11) are arranged inside the box body (1), a plurality of moving rods (12) are fixedly arranged on the top of the cross plates (11), the moving rods (12) penetrate through the box body (1) and the fixed box (2) and extend outside the fixed box (2), a plurality of springs (13) are fixedly arranged on the top of the box body (1), and a connecting plate (14) is fixedly arranged on the outside of the plurality of moving rods (12), and the top of the spring (13) is fixedly connected with the bottom of the connecting plate (14). The drilling mechanism further includes a support component, the support component includes a protective box (15), the motor (3) is fixedly arranged inside the protective box (15), and a plurality of heat dissipation holes (16) are formed in the protective box (15). The drilling mechanism further includes a fifth bevel gear (28), the fifth bevel gear (28) is fixedly arranged on the outside of the rotating rod (4), a sixth bevel gear (29) is arranged at the bottom of the fifth bevel gear (28), the sixth bevel gear (29) meshes with the fifth bevel gear (28), a second screw rod (30) is fixedly arranged at the bottom of the fifth bevel gear (28), the second screw rod (30) extends out of the bottom of the discharge hopper (8), and the second screw rod (30) is connected with the discharge hopper (8) through a bearing. The ventilation component includes a first bevel gear (17), the first bevel gear (17) is fixedly arranged outside the rotating rod (4), a second bevel gear (18) is arranged on the top of the first bevel gear (17), the first bevel gear (17) meshes with the second bevel gear (18), a connecting rod (19) is arranged on the top of the second bevel gear (18), a connecting cylinder (20) is fixedly arranged on the top of the box body (1), the top of the connecting rod (19) is connected to the top inner cavity of the connecting cylinder (20) through a bearing, a third bevel gear (21) is fixedly arranged outside the connecting rod (19), a fourth bevel gear (22) is arranged on one side of the third bevel gear (21), a connecting rod (23) is fixedly arranged on one side of the fourth bevel gear (22), a plurality of fan blades (24) are fixedly arranged outside the connecting rod (23), and one end of the connecting rod (23) is connected to one side wall of the connecting cylinder (20) through a bearing; A connecting box (25) is fixedly arranged outside the fixed box (2), the top of the connecting box (25) is fixedly connected to the connecting cylinder (20), a plurality of support plates (26) are fixedly arranged inside the connecting cylinder (20), the support plates (26) are connected to the connecting rod (23) through bearings, and an air outlet pipe (27) is fixedly arranged on the top of the connecting cylinder (20).

2. The reverse circulation drilling equipment for soft and collapsed outburst coal seams according to claim 1, characterized in that: A partition plate (31) is fixedly arranged inside the box body (1), and the partition plate (31) is connected to the first screw rod (5) through a bearing.

3. The reverse circulation drilling equipment for soft and collapsing outburst coal seams according to claim 1, characterized in that: A protection box (32) is fixedly arranged inside the box body (1), the first bevel gear (17), the second bevel gear (18), the fifth bevel gear (28) and the sixth bevel gear (29) are all arranged inside the protection box (32), and the connecting rod (19) and the second screw rod (30) are both connected to the protection box (32) through bearings.

4. A reverse circulation drilling device for soft and collapsed outburst coal seams according to claim 1, characterized in that: The support component includes a fixing plate (33), the fixing plate (33) is fixedly arranged on one side of the box body (1), the top of the fixing plate (33) is fixedly connected to the bottom of the motor (3), and an inclined plate (34) is fixedly arranged at the bottom of the fixing plate (33), and one side of the inclined plate (34) is fixedly connected to one side of the box body (1).

5. A drilling process using the reverse circulation drilling equipment for soft and collapsed outburst coal seams described in claim 1, characterized in that: The specific steps of the drilling process are as follows: S1 Start-up: First, connect to an external power supply, then start the motor (3), and align the drill bit (7) with the coal seam. The motor (3) works to drive the rotating rod (4) to rotate. The rotating rod (4) rotates to drive the first screw rod (5) to rotate. The first screw rod (5) rotates to drive the drill bit (7) to rotate. The drill bit (7) rotates to drill into the coal seam, and at the same time, larger coal blocks can be broken. Then, the coal can be input into the box body (1) through the first screw rod (5); S2 Air permeability: While the rotating rod (4) rotates, it will also drive the circular plate (9) to rotate. The circular plate (9) rotates to drive a plurality of knocking plates (10) outside the circular plate (9) to rotate. The knocking plates (10) rotate to knock on the cross plate (11). Through the design of the spring (13), the cross plate (11) and the moving rod (12) can move up and down continuously. Through the movement of the moving rod (12), the gas in the coal seam can enter the fixed box (2) through the holes after the movement of the moving rod (12); S3 Ventilation: While the rotating rod (4) rotates, it will also drive the first bevel gear (17) to rotate. The rotation of the first bevel gear (17) drives the second bevel gear (18) to rotate. The rotation of the second bevel gear (18) drives the connecting rod (19) to rotate. The rotation of the connecting rod (19) drives the third bevel gear (21) to rotate. The rotation of the third bevel gear (21) drives the connecting rod (23) to rotate. The rotation of the connecting rod (23) drives the multiple fan blades (24) outside the connecting rod (23) to rotate. The rotation of the multiple fan blades (24) can generate suction, and then the gas in the coal seam can be sucked into the inside of the connecting cylinder (20) and discharged through the air outlet pipe (27); S4 Material Conduction: While the rotating rod (4) rotates, it will also drive the fifth bevel gear (28) to rotate. The rotation of the fifth bevel gear (28) drives the sixth bevel gear (29) to rotate. The rotation of the sixth bevel gear (29) drives the second screw rod (30) to rotate. The rotation of the second screw rod (30) can conduct the coal, so that the coal can be discharged through the discharge hopper (8).

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