Device and method for extracting coal body drilling cuttings under negative pressure
By designing a negative pressure extraction coal body drill cutting device and using a centrifugal fan to generate negative pressure suction, the problem of difficulty in collecting drill cuttings in wet coal body is solved, and the monitoring accuracy and application scope of the drill cutting method are improved.
Patent Information
- Application Number
- CN202510473147.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2025-07-11
AI Technical Summary
In wet coal body, it is difficult for the twist drill pipe to effectively collect drill chips, resulting in low accuracy of monitoring impact ground pressure by drill chip method and limited scope of application.
A negative pressure extraction coal body drill chip device is designed, including a drill rod set, connector, drill rig and chip collection device. The negative pressure is used to generate coal body debris to absorb coal body debris. Through the spiral blades and a detachable connected drill rod structure, the efficient collection of coal body debris is achieved.
It improves the efficiency of collecting drill chips in wet coal body, ensures the monitoring accuracy and scope of application of drill chips, and simplifies the operation process.
Smart Images
Figure CN120291822A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a drill cuttings device and method for extracting coal body under negative pressure, belonging to the technical fields of coal mining and coal mine safety. Background Art
[0002] The drill cuttings method is a monitoring method for rock burst hazard, which has the advantages of simple operation and high accuracy, and is widely used in the monitoring of coal mine rock bursts. By using a coal drill bit to break coal to form a hole and a twist drill rod to rotate and discharge drill cuttings, the implementation of the drill cuttings method is ensured. However, when the moisture content of the coal body is relatively high, the coal body will wrap around the drill rod, making it difficult for the twist drill rod to discharge drill cuttings, and it is impossible to effectively monitor the rock burst hazard of wet coal bodies. Under the action of mining, due to the formation of a large number of fissures in the coal and rock mass around the roadway, the water in the aquifer seeps into the coal body, increasing the humidity of the coal body. In particular, the method of softening the coal body by high-pressure water injection to control rock bursts further increases the humidity of the coal body, resulting in the drill cuttings monitoring method often being in a failure state. In addition, when using a twist drill rod for monitoring, a large amount of drill cuttings are lost and the accuracy is low. Summary of the Invention
[0003] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a drill cuttings device and method for extracting coal body under negative pressure, which can effectively solve the problems of ineffective collection of drill cuttings from wet coal bodies and omission of coal cuttings, thereby improving the applicable range and breadth of the drill cuttings method.
[0004] To achieve the above-mentioned invention purpose, the present invention provides a drill cuttings device for extracting coal body under negative pressure, including a drill rod set, a connector, a drill rig and a chip collection device;
[0005] The drill rod set includes a drill bit and multiple hollow drill rods; a planar spiral blade is wound around the outer circumference of the hollow drill rod along its axial direction, and adjacent hollow drill rods are connected through a threaded interface;
[0006] The connector includes a rectangular hollow body, a connection center and a sealing bearing; the outer surface of the rectangular hollow body is rectangular, and the hollow part is cylindrical; a cylindrical hole is opened on one side of the rectangular hollow body, and a cylindrical cap is provided outside the hole, and the chip collection device is communicated with the hole through the cap; the connection center is embedded in the hollow cylinder, and its upper and lower ends are respectively connected to the drill rod set and the drill rig; the middle of the connection center is a cylindrical hollow body with multiple cylindrical holes on its surface, one end of the cylindrical hollow body faces the rectangular hollow body, and the other end is communicated with the hole; a sealing bearing is used to connect the connection center and the rectangular hollow body;
[0007] The chip collection device includes a drill cuttings recovery pipe, a filter, a chip collector and a centrifugal fan; one end of the drill cuttings recovery pipe is connected to the chip outlet end of the hole, the other end of the drill cuttings recovery pipe is connected to one end of the filter, the other end of the filter is connected to the centrifugal fan, and the lower end of the filter is connected to the chip collector.
[0008] Further, the drill bit consists of four blades located around the circumference, with a hole in the middle. There is a threaded interface between the drill bit and the drill pipe for detachable connection. The outer diameter of the drill bit is 42 mm, and the hole diameter is not less than 20 mm.
[0009] Further, the adjacent hollow drill pipes are connected by threaded interfaces, and the interfaces are sealed. The planar spiral blades are welded onto the hollow drill pipes.
[0010] Further, both sides of the connection center are connected to the drill rig and the hollow drill pipe through threaded interfaces, and the axes of the drill rig and the hollow drill pipe are on the same straight line. There is a gap between the cylindrical hollow body and the rectangular hollow body to ensure the free rotation of the cylindrical hollow body. The cylindrical holes on the surface of the cylindrical hollow body are evenly distributed, and the axes of the cylindrical holes of the cylindrical hollow body and the rectangular hollow body are on the same line. The cylindrical hollow body communicates with the hole.
[0011] Further, the centrifugal fan has stepless speed regulation.
[0012] Further, the diameter of the filter mesh holes is determined according to the size of the pulverized coal particles after crushing, ensuring that it can filter out coal chips while ensuring sufficient air permeability.
[0013] Further, the drill cuttings recovery pipe is a telescopic hose, and its inner diameter is adapted to the outer diameter of the cylindrical cap of the rectangular hollow body.
[0014] Further, the drill bit, drill pipe, connector, drill rig, filter, chip collector, and centrifugal fan are all detachable connections.
[0015] The present invention also provides a method for negative pressure extraction of coal drill cuttings, specifically as follows:
[0016] S1. Determine the construction depth and inclination angle of the drill cuttings hole based on data such as coal seam thickness, roadway height, coal seam dip angle, and coal pillar width.
[0017] S2. Take a drill pipe and connect its two ends to the drill bit and the connector respectively. The connector is connected to the drill rig and the drill cuttings collector respectively.
[0018] S3. The drill rig drives the drill pipe and the drill bit to drill and cut the coal body to form a hole. At the same time, the centrifugal fan starts to suck the crushed coal powder. The coal powder is concentrated in the chip collector through the drill bit, drill pipe, and connector. After the construction of the first drill pipe is completed, the coal powder in the chip collector is weighed and recorded.
[0019] S4. After each completion of the construction length of one drill pipe, add one more drill pipe and weigh the coal powder. Repeat this process until the hole reaches the designed depth.
[0020] When there is an impact in the hole, rely on the rotation of the spiral blades outside the drill pipe to discharge the coal powder, and the drill pipe is continuously withdrawn to avoid the drill pipe being stuck and lost.
[0021] The present invention solves the problem that twist drill pipes cannot recover wet coal debris by setting up a drill pipe set, a connector, a drill rig and a chip collection device. The drill rig, the drill pipe and the centrifugal fan are connected by the connector. A rotatable cylindrical hollow body is arranged in the connector, and a plurality of circular through holes are formed in the hollow body. When drilling and coal breaking, the drill rig rotates, and the coal debris at the drill bit enters the hollow drill pipe under the suction negative pressure of the centrifugal fan, and is collected by the drill chip recovery device through the holes formed in the cylindrical hollow body and the connector. The suction effect of the centrifugal fan is used to collect the broken coal chips, and the device has a simple structure, is easy to operate, and has a wide application range. Brief Description of the Drawings
[0022] Figure 1 is a schematic structural view of the present invention;
[0023] Figure 2 is a schematic view of the drill bit design of the present invention;
[0024] Figure 3 is a schematic cross-sectional view of the drill pipe of the present invention;
[0025] Figure 4 is a schematic cross-sectional view of the connector of the present invention Figure 1 ;
[0026] Figure 5 is a schematic cross-sectional view of the connector of the present invention Figure 2 .
[0027] In the figure: 1. Drill pipe set, 101. Drill bit, 102. Hollow drill pipe, 103. Plane spiral blade, 104. Threaded interface; 2. Connector, 21. Rectangular hollow body, 211. Hole, 212. Brim, 22. Connection center, 221. Cylindrical hollow body, 222. Cylindrical hole, 23. Sealed bearing, 3. Drill rig, 4. Chip collection device, 401. Drill chip recovery pipe, 402. Filter, 403. Chip collector, 404. Centrifugal fan. Detailed Embodiment
[0028] The following further describes the embodiments of the present invention with reference to the drawings.
[0029] As Figures 1 to 5 shown, a negative pressure extraction coal drill chip device includes a drill pipe set 1, a connector 2, a drill rig 3 and a chip collection device 4;
[0030] The drill pipe set 1 includes a drill bit 101 and a plurality of hollow drill pipes 102; a plane spiral blade 103 is wound around the outer circumference of the hollow drill pipe 102 along its axial direction, and adjacent hollow drill pipes 102 are connected by a threaded interface 104;
[0031] The connector 2 includes a rectangular hollow body 21, a connection center 22, and a sealing bearing 23; the outer surface of the rectangular hollow body 21 is rectangular, and the hollow part is cylindrical; a cylindrical hole 211 is provided on one side of the rectangular hollow body 21, and a cylindrical cap 212 extending out is provided outside the hole 211. The chip collection device 4 communicates with the hole 211 through the cap 212; the connection center 22 is embedded in the hollow cylinder, and its upper and lower ends are respectively connected to the drill pipe set 1 and the drill rig 3; in the middle of the connection center 22 is a cylindrical hollow body 221 with a plurality of cylindrical holes 222 on its surface. One end of the cylindrical hollow body 221 faces the rectangular hollow body 21, and the other end communicates with the hole 211; the connection center 22 and the rectangular hollow body 21 are connected by a sealing bearing 23;
[0032] The chip collection device 4 includes a drill chip recovery pipe 401, a filter 402, a chip collector 403, and a centrifugal fan 404; one end of the drill chip recovery pipe 401 is connected to the chip outlet end of the hole 211, the other end of the drill chip recovery pipe 401 is connected to one end of the filter 402, the other end of the filter 402 is connected to the centrifugal fan 404, and the lower end of the filter 402 is connected to the chip collector 403.
[0033] As a preferred embodiment, the drill bit 101 is composed of four blades, the blades are located around, there is a hole in the middle of the drill bit, and there is a threaded interface between the drill bit and the drill pipe, which is detachably connected.
[0034] As a preferred embodiment, the threaded interfaces between adjacent hollow drill pipes 102 are connected and sealed; the planar spiral blades 103 are welded on the hollow drill pipes 102.
[0035] As a preferred embodiment, both sides of the connection center 22 are connected to the drill rig 3 and the hollow drill pipe 102 through threaded interfaces, and the axes of the drill rig 3 and the hollow drill pipe 102 are on the same straight line; there is a gap between the cylindrical hollow body 221 and the rectangular hollow body 21; the cylindrical holes 222 on the surface of the cylindrical hollow body 221 are evenly distributed, and the axes of the cylindrical hollow body 221 and the cylindrical hole 211 of the rectangular hollow body 21 are on the same line; the cylindrical hollow body 221 communicates with the hole 211.
[0036] As a preferred embodiment, the centrifugal fan 404 has stepless speed regulation.
[0037] As a preferred embodiment, the drill chip recovery pipe 401 is a telescopic hose, and its inner diameter is adapted to the outer diameter of the cylindrical cap 212 of the rectangular hollow body 21.
[0038] As a preferred embodiment, the drill bit 101, the drill pipe 102, the connector 2, the drill rig 3, the filter 402, the chip collector 403, and the centrifugal fan 404 are all detachably connected.
[0039] In use, the drill bit 101 is connected to the hollow drill pipe 102 to form a drill pipe set 1. First, one side sealing bearing 23 is installed at the connection center 22 and is fitted into the rectangular hollow body 21, and then the other side sealing bearing 23 is installed to form a connector 2. The two ends of the connection center 22 are respectively connected to the drill pipe set 1 and the drilling rig 3, and the cylindrical brim 212, the drill cuttings recovery pipe 401, the filter 402, the chip collector 403 and the centrifugal fan 404 are connected in sequence. Thus, a negative pressure extraction coal body drill cuttings device is assembled.
[0040] Start the drilling rig to drive the connector, drill pipe and drill bit to rotate. The blades at the front of the drill bit cut and break the coal body. Under the negative pressure suction effect generated by the centrifugal fan, the coal body debris enters the hollow drill pipe through the hole in the middle of the drill bit, passes through the connector, and converges to the total drill cuttings recovery pipe and settles into the chip collection device. The drill pipe and drill bit continuously move forward under the thrust of the drilling rig and closely contact the coal wall for cutting and advancing; when the advancing distance reaches 1 m, stop drilling, add drill pipes, and at the same time weigh the weight of the drill cuttings within 1 m. Repeat the cycle until the designed depth of the borehole is reached. For cases of dynamic disasters such as coal bumps and collapse of the borehole wall that jams the drill pipe, the pulverized coal from the collapsed borehole is continuously discharged through the external threads of the drill pipe, and this part of the pulverized coal is not weighed. After completing the drill cuttings monitoring, pull out the drill pipe by the retracting force of the drilling rig, and rely on the external threads of the drill pipe to discharge the pulverized coal on the borehole wall until all the drill pipes are withdrawn.
Claims
1. A device for extracting coal cuttings under negative pressure, characterized in that, It includes a drill pipe set (1), a connector (2), a drill rig (3) and a chip collecting device (4); The drill pipe set (1) includes a drill bit (101) and multiple hollow drill pipes (102); a planar spiral blade (103) is wound along the axial direction of the outer circumference of the hollow drill pipe (102), and adjacent hollow drill pipes (102) are connected through a threaded interface (104); The connector (2) includes a rectangular hollow body (21), a connection center (22) and a sealing bearing (23); the outer surface of the rectangular hollow body (21) is rectangular, and the hollow part is cylindrical; a cylindrical hole (211) is opened on one side of the rectangular hollow body (21), and a cylindrical cap (212) extending out is provided outside the hole (211), and the chip collecting device (4) is communicated with the hole (211) through the cap (212); the connection center (22) is embedded in the hollow cylinder, and its upper end and lower end are respectively connected to the drill pipe set (1) and the drill rig (3); the middle of the connection center (22) is a cylindrical hollow body (221) with a plurality of cylindrical holes (222) on its surface, one end of the cylindrical hollow body (221) faces the rectangular hollow body (21), and the other end is communicated with the hole (211); a sealing bearing (23) is used to connect the connection center (22) and the rectangular hollow body (21); The chip collecting device (4) includes a drill chip recovery pipe (401), a filter (402), a chip collector (403) and a centrifugal fan (404); one end of the drill chip recovery pipe (401) is connected to the chip outlet end of the hole (211), the other end of the drill chip recovery pipe (401) is connected to one end of the filter (402), the other end of the filter (402) is connected to the centrifugal fan (404), and the lower end of the filter (402) is connected to the chip collector (403).
2. The negative pressure extraction coal body drill cuttings device according to claim 1, characterized in that, The drill bit (101) is composed of four blades, the blades are located around, there is a hole in the middle of the drill bit, and there is a threaded interface between the drill bit and the drill pipe, and they are detachably connected.
3. The negative pressure coal body drill cuttings extraction device according to claim 1, characterized in that The adjacent hollow drill pipes (102) are connected by a threaded interface, and the interface is sealed; the planar spiral blade (103) is welded on the hollow drill pipe (102).
4. The negative pressure extraction device for coal drill cuttings according to claim 1, characterized in that, Both sides of the connection center (22) are connected to the drill rig (3) and the hollow drill pipe (102) through threaded interfaces, and the axes of the drill rig (3) and the hollow drill pipe (102) are on the same straight line; there is a gap between the cylindrical hollow body (221) and the rectangular hollow body (21); the cylindrical holes (222) on the surface of the cylindrical hollow body (221) are evenly distributed, and the axes of the cylindrical hollow body (221) and the cylindrical hole (211) of the rectangular hollow body (21) are on the same line; the cylindrical hollow body (221) is communicated with the hole (211).
5. The device for extracting coal cuttings under negative pressure according to claim 1, characterized in that, The centrifugal fan (404) has stepless speed regulation.
6. The negative pressure coal body drill cuttings extraction device according to claim 1, characterized in that, The drill chip recovery pipe (401) is a telescopic hose, and its inner diameter is adapted to the outer diameter of the cylindrical cap (212) of the rectangular hollow body (21).
7. The negative pressure extraction device for coal drill cuttings according to claim 1, wherein The drill bit (101), the drill pipe (102), the connector (2), the drill rig (3), the filter (402), the chip collector (403), and the centrifugal fan (404) are all detachably connected.
8. A method for extracting coal cuttings by negative pressure, characterized in that, The steps are as follows: S1. Determine the construction depth and inclination angle of the drill cuttings holes according to the data of coal seam thickness, roadway height, coal seam dip angle, and coal pillar width; S2. Take a drill pipe, connect its two ends to the drill bit and the connector respectively, and the connector is connected to the drill rig and the drill cuttings collector respectively; S3. The drill rig drives the drill pipe and the drill bit to drill and cut the coal body to form a borehole. At the same time, the centrifugal fan starts to suck the crushed coal powder. The coal powder is concentrated in the chip collector through the drill bit, drill pipe, and connector. After the construction of the first drill pipe is completed, weigh and record the coal powder in the chip collector; S4. After that, for each completed construction length of a drill pipe, add a drill pipe and weigh the coal powder. Repeat this process until the borehole reaches the designed depth.