Mechanical reamer for rock burst mines
By designing a mechanical reaming drill bit and using high-pressure water to control the opening and closing of the cutter chain, adjustable reaming of large-diameter drill bits for coal seams was achieved, solving the problem of poor pressure relief effect of existing drill bits and improving the pressure relief effect in mines prone to rock bursts.
Patent Information
- Application Number
- CN202211362182.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-11-02
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2042-11-02
AI Technical Summary
Existing large-diameter drill bits for coal seams have limited pressure relief effects and cannot effectively reduce stress concentration in mines prone to rock bursts.
A mechanical reaming drill bit was designed, comprising a drill rod, a drill bit, a telescopic reaming cutter, a spring, and a high-pressure water valve system. The opening and closing of the cutter chain is controlled by high-pressure water to achieve forward and backward reaming, and the reaming radius can be adjusted to adapt to different coal seam conditions.
It achieves targeted coal seam pressure relief, enhances the prevention and control of rockburst mines, has an adjustable borehole radius, and combines forward and backward borehole expansion methods, thus improving the pressure relief effect.
Smart Images
Figure CN115573666B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of rock burst prevention equipment, and relates to a mechanical reaming drill bit for a rock burst mine. BACKGROUND
[0002] In recent years, with the increase of mining depth in China, rock burst mines also increase. Therefore, in order to ensure the safety of coal mine production, large-diameter drilling for pressure relief must be used in the rock burst area. By discharging a large amount of coal powder in the drill hole, the damage area of the coal body around the drill hole is expanded, so as to reduce the stress concentration degree of the coal and rock body in a certain stress area around the drill hole, and make the high stress transfer to the deep part of the coal and rock body, so as to achieve the purpose of pressure relief of local coal body. It is understood that the large-diameter drill bit used in coal mines at present is mostly a single diameter unchangeable drill bit, and the pressure relief effect of the stress concentration area in the coal body is not obvious. SUMMARY
[0003] The purpose of the present application is to provide a mechanical reaming drill bit for a rock burst mine, which solves the problems of single hole diameter and poor pressure relief effect of the existing large-diameter pressure relief drilling tool.
[0004] The technical scheme adopted by the present application is that the mechanical reaming drill bit for a rock burst mine comprises a drill rod, a drill bit connected to one end of the drill rod, a thread provided on the outer periphery of the other end of the drill rod, a plurality of spray holes provided on the drill bit, a plurality of embedding grooves provided on the outer side of the drill rod and symmetrical to the length direction of the drill rod, a retractable reaming cutter provided in each embedding groove, a high-pressure pipeline provided in the drill rod and communicated with the embedding grooves and the spray holes, and a spring provided in the high-pressure pipeline and connected with the retractable reaming cutter.
[0005] The present application is further characterized in that
[0006] The retractable reaming cutter comprises a cutter chain, one end of the cutter chain is fixedly connected with one end of the embedding groove, and the other end of the cutter chain is fixedly connected with the retractable end of the spring.
[0007] The cutter chain comprises two cutters connected by a hinge.
[0008] The high-pressure pipeline comprises a high-pressure water inlet pipeline and a high-pressure shunt pipeline which are communicated with each other, the high-pressure shunt pipeline extends into the drill bit and is communicated with the spray hole, and a shunt pipeline is further provided on both sides of the high-pressure water inlet pipeline and is communicated with the embedding groove, a high-pressure water valve is provided in the shunt pipeline, and the spring is located at a position close to the end of the shunt pipeline.
[0009] The diameters of the shunt pipeline and the high-pressure shunt pipeline are smaller than that of the high-pressure water inlet pipeline.
[0010] The fixed end of the spring is fixedly connected with the inner wall of the shunt pipeline, and a limiting buckle is provided between the fixed end and the retractable end of the spring on the inner wall of the shunt pipeline.
[0011] When the spring reaches the maximum elongation, the telescopic end thereof is located at the joint of the shunt pipeline and the embedding groove.
[0012] The telescopic direction of the spring is consistent with the water flow direction of the shunt pipeline.
[0013] The drill bit is threadedly connected with the drill rod.
[0014] The beneficial effects of the present application are,
[0015] (1) The mechanical reaming drill bit for the rock burst mine of the present application is used in combination with the telescopic reaming cutters on both sides of the drill rod, the high-pressure pipeline inside the drill rod and the high-pressure water valve to ream the dangerous area of rock burst and release pressure;
[0016] (2) The mechanical reaming drill bit for the rock burst mine of the present application is provided with the telescopic reaming cutters embedded on both sides of the drill rod and the spring device inside the drill rod, which can adjust the reaming radius according to the site requirement, can more specifically release pressure, and also has the forward and backward reaming modes, thus having better pressure releasing effect. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 is a structural schematic view of the mechanical reaming drill bit for the rock burst mine of the present application;
[0018] Figure 2 is a structural schematic view of the mechanical reaming drill bit for the rock burst mine of the present application when the reaming cutters are closed;
[0019] Figure 3 is Figure 1 is a local enlarged structural schematic view of the position 7 in
[0020] Figure 4 is Figure 1 is a local enlarged structural schematic view of the position 3 in
[0021] In the figure, 1. high-pressure water inlet pipeline, 2. limiting buckle, 3. spring, 4. drill rod, 5. cutter chain, 6. hinge, 7. high-pressure water valve, 8. drill bit, 9. shunt pipeline, 10. high-pressure shunt pipeline. DETAILED DESCRIPTION
[0022] The present application will be described in detail below in combination with the drawings and specific embodiments.
[0023] The mechanical reaming drill bit for the rock burst mine of the present application has the structure as Figure 1 and Figure 2As shown, including drill pipe 4, drill pipe 4 one end connected with drill bit 8, drill bit 8 can be detached, used to drill into the coal seam, the other end of the drill pipe 4 is the drill tail, the drill tail is provided with a thread on the outer periphery, the drill tail can be threaded to connect a drill pipe 4 when the drill pipe 4 is not long enough, drill bit 8 is provided with a plurality of injection holes, the outer side of the drill pipe 4 is symmetrically provided with an embedded slot consistent with the length direction of the drill pipe 4, and the embedded slot is provided with a telescopic reaming cutter.
[0024] The telescopic reaming cutter comprises a cutter chain 5 fixedly arranged in the embedded slot, and the cutter chain 5 comprises two cutters connected by a hinge 6. The hinge 6 is arranged at the intersection of the cutters, and is used for controlling the activity of the reaming cutter.
[0025] One end of the cutter chain 5 is fixedly connected with one end of the embedded slot, and the other end of the cutter chain 5 is fixedly connected with the telescopic end of the spring 3. The cutter chain 5 and the hinge 6 are used for large-diameter reaming and pressure relief in the coal seam of the rock burst mine.
[0026] As shown in Figure 2 and Figure 4 , the drill pipe 4 is provided with a high-pressure pipeline, the high-pressure pipeline comprises a high-pressure water inlet pipeline 1 arranged at the drill tail, the direction is consistent with the length direction of the drill pipe 4, the high-pressure water inlet pipeline 1 is communicated with a high-pressure shunt pipeline 10, the high-pressure shunt pipeline 10 extends into the drill bit 8, cooperates with the injection hole on the outer periphery of the drill bit 8, and the high-pressure water inlet pipeline 1 is vertically and symmetrically communicated with a shunt pipeline 9 on both sides. High-pressure water valves 7 are arranged on both sides of the pipe interface between the shunt pipeline 9 and the high-pressure water inlet pipeline 1, respectively. The diameters of the shunt pipeline 9 and the high-pressure shunt pipeline 10 are smaller than the diameter of the high-pressure water inlet pipeline 1, and when the water pressure is large enough, the high-pressure shunt pipeline 10 is not enough to shunt, when the water pressure reaches a threshold value, the high-pressure water valve 7 is opened, and the high-pressure water flows to the shunt pipeline 9.
[0027] As shown in Figure 3 , the shunt pipeline 9 comprises a vertical pipe and a horizontal pipe perpendicular to each other, the fixed end of the spring 3 is fixedly connected to the inner wall of the corner of the shunt pipeline 9, the limit buckle 2 is arranged on the inner wall of the shunt pipeline 9 between the fixed end and the telescopic end of the spring 3, the telescopic end of the spring 3 is fixedly connected with the cutter, the telescopic direction of the spring 3 is consistent with the water flow direction in the horizontal pipe of the shunt pipeline 9, and when the spring 3 reaches the maximum elongation, the telescopic end thereof is located at the connection between the shunt pipeline 9 and the embedded slot. When reaming is needed, the high-pressure water in the shunt pipeline 9 pushes the spring 3 through the limit buckle 2, so that the cutter chain 5 is gradually opened for reaming. The opening and closing degree of the reaming cutter is controlled by the cooperation of the high-pressure water valve 7, the spring 3, the cutter chain 5 and the hinge 6, and at the same time, the high-pressure water will flow through the horizontal pipe along the vertical pipe of the shunt pipeline 9 and then follow the reaming cutter to expand, and the coal powder is washed away during reaming.
[0028] The working principle of the mechanical reaming drill bit for rock burst mine of the present application is as follows:
[0029] During the conventional drilling, the high-pressure water valve 7 is closed, the high-pressure water enters the drill rod 4 through the high-pressure water inlet pipe 1, and then reaches the drill bit 8 through the high-pressure shunt pipe 10, and is sprayed out of the jet hole of the drill bit 8.
[0030] During the advancing reaming, the high-pressure water valve 7 is opened, the high-pressure water pushes the spring 3, so that the cutter chain 5 is gradually opened, the cutters on both sides of the hinge 6 are fixed and start to ream, and the reaming drill bit 8 can be given a forward thrust into the borehole by the drilling machine, so as to drive the reaming cutter to achieve the purpose of advancing reaming. The advancing reaming is mainly aimed at the coal seam which is relatively hard, the coal seam in which the coal gun sound is relatively frequent, and the coal seam with dirt band.
[0031] The working principle of the retreating reaming is similar to that of the advancing reaming, the reaming drill bit 8 can control the drill rod 4 to retreat to drive the reaming cutter to retreat and ream, and after the reaming is completed, the retracted cutter can quickly complete the rod retraction and drill retraction. The retreating reaming is mainly aimed at the easily drilled coal seam during the reaming process and the retreating reaming can be used during the second half of the reaming to achieve the purpose of quickly reaming and drilling.
[0032] The working process of the mechanical reaming drill bit for the rock burst mine well of the application is as follows:
[0033] During the conventional drilling, the telescopic reaming cutter and the high-pressure water valve 7 are closed, the high-pressure water flows to the drill bit 8 through the high-pressure water inlet pipe 1 and the high-pressure shunt pipe 10 inside the drill rod 4, and the high-pressure water is sprayed out of the jet hole of the drill bit 8 to flush the coal powder during the drilling of the drill bit 8 into the coal seam, and the coal powder water flows along the drilling process to achieve the purpose of coal powder removal. When the reaming drill bit 8 reams, the high-pressure water valve 7 is opened, the high-pressure water pushes the telescopic end of the spring 3 to extend and push the cutter chain 5, and the fixed end of the hinge 6 and the embedded groove are gradually opened, the cutter chain 5 is gradually opened, the reaming starts, and the advancing reaming or the retreating reaming can be selected according to the needs of the site; at the same time, the reaming radius can also be selected according to the pressure relief conditions, and the opening degree of the reaming cutter can be controlled according to the size of the high-pressure water pressure. After the reaming of the cutter chain 5 is completed, the high-pressure water valve 7 is closed, and the spring 3 is retracted, so as to retract the cutter chain 5 into the embedded groove.
[0034] The mechanical reaming drill bit for the rock burst mine well of the application can ream and relieve pressure in the dangerous area of the rock burst, and the high-pressure water valve device arranged inside the drill rod 4, the telescopic cutter arranged outside the drill rod 4 and the spring device can independently adjust the size of the reaming radius, and the pressure relief treatment can be carried out in a targeted manner, so that the pressure relief effect is better. The advancing reaming or the retreating reaming can be selected according to the needs of the site; at the same time, the opening degree of the reaming cutter can be controlled according to the pressure relief conditions and the size of the high-pressure water pressure, so as to control the size of the reaming and pressure relief borehole diameter, and the advancing reaming and the retreating reaming are also provided, and the rock burst prevention and control effect is better.
Claims
1. A mechanical reamer for use in a rock mine, characterised in that, The drill rod (4) is provided with a drill bit (8) at one end, and a thread is arranged on the outer periphery of the other end of the drill rod (4); the drill bit (8) is provided with a plurality of spray holes; a plurality of expansion slots are symmetrically arranged on the outer side of the drill rod (4) and are consistent with the length direction of the drill rod (4); a retractable expansion cutter is arranged in each expansion slot; a high-pressure pipeline is further arranged in the drill rod (4); the high-pressure pipeline is in communication with the expansion slots and the spray holes; a spring (3) is arranged in the high-pressure pipeline and is connected with the retractable expansion cutter. The high-pressure pipeline comprises a high-pressure water inlet pipeline (1) and a high-pressure shunt pipeline (10) in communication with each other; the high-pressure shunt pipeline (10) extends into the drill bit (8) and is in communication with the spray holes; a shunt pipeline (9) is symmetrically arranged on both sides of the high-pressure water inlet pipeline (1) and is in communication with the expansion slots; a high-pressure water valve (7) is arranged in the shunt pipeline (9); the spring (3) is located at a position close to the end of the shunt pipeline (9). The shunt pipeline (9) comprises a vertical pipe and a horizontal pipe which are perpendicular to each other; the spring (3) is fixedly connected with the inner wall of the shunt pipeline (9); a limiting buckle (2) is arranged on the inner wall of the shunt pipeline (9) between the fixed end and the retractable end of the spring (3). When the spring (3) reaches the maximum elongation, the retractable end of the spring (3) is located at the connection position of the shunt pipeline (9) and the expansion slot. The spring (3) is consistent with the water flow direction of the shunt pipeline (9) in the retractable direction.
2. A mechanical reamer for use in a rock burst mine as claimed in claim 1, characterised in that, The retractable expansion cutter comprises a cutter chain (5); one end of the cutter chain (5) is fixedly connected with one end of the expansion slot; the other end of the cutter chain (5) is fixedly connected with the retractable end of the spring (3).
3. A mechanical reamer for use in a rock burst mine as claimed in claim 2, characterised in that, The cutter chain (5) comprises two cutters which are connected by a hinge (6).
4. A mechanical reamer for use in a rock mine according to claim 1, wherein The diameters of the shunt pipeline (9) and the high-pressure shunt pipeline (10) are smaller than that of the high-pressure water inlet pipeline (1).
5. A mechanical reamer for use in a rock mine according to claim 1, wherein The drill bit (8) is threadedly connected with the drill rod (4).
Citation Information
Patent Citations
Improved-type multifunctional combined drill bit
CN102767335A
Telescopic mechanical reamer bit
CN218716552U