Coal mine roadway floor rapid drilling device and drilling method

Abstract

This invention discloses a rapid drilling device and method for the floor of coal mine roadways. It includes a drilling rig, drill rods, and a drill bit. The drill rods consist of a transition drill rod and a circular drill rod. A water channel is provided through the transition drill rod, the circular drill rod, and the drill bit at a certain thickness. A water extraction pipe is provided inside the transition drill rod and the circular drill rod. A water extraction pipe and a water supply pipe are sleeved through the center of the drill arm. The drill arm's water extraction pipe communicates with the drill rod's water extraction pipe and the drill bit's inner cavity. The drilling rig's water supply pipe communicates with the drill rod's water channel. During drilling, water injected from the water supply pipe enters the bottom of the hole through the water channel. The water at the bottom of the hole, carrying drill cuttings, is extracted sequentially through the hollow drill bit, the drill rod's water extraction pipe, and the drill arm's water extraction pipe under external negative pressure. This allows drilling mud to be continuously extracted from the center of the drill rod during drilling, eliminating the need for special drill bit removal and cuttings disposal, shortening the drilling progress, greatly improving drilling efficiency, ensuring the floor pressure relief effect, and providing technical support for safe production on site.

Description

Technical Field

[0001] This invention belongs to the field of coal mining. Background Technology

[0002] With the steady growth of global energy demand, coal's status and role as my country's safety net energy source are unlikely to change. After long-term large-scale development, coal mining depths are increasing, and production conditions are becoming more complex. With increased mining depth and more complex production conditions, dynamic disasters such as rockbursts are becoming more frequent. Rockbursts are dynamic disasters caused by the sudden release of elastic strain energy accumulated in the coal and rock mass during mining, resulting in severe damage to the coal and rock mass. In recent years, major and serious rockburst accidents have occurred frequently, causing severe casualties and economic losses, seriously threatening the safe and efficient production of coal mines. Rockburst prevention and control has become a focus of public attention. In response to rockburst accidents, the State Council Safety Committee pointed out that it is necessary to strengthen the management of the "zero impact" target (no casualties, no roadway damage, no equipment damage) for coal (rock), strictly control rockburst phenomena and events, and resolutely curb the occurrence of accidents.

[0003] Given the severity and frequency of rockburst accidents, domestic and international experts and scholars have conducted in-depth research on the mechanisms of rockburst occurrence, forming a complete technical system for rockburst hazard monitoring, early warning, and prevention. This system provides strong technical support for rockburst prevention in coal mines and significantly reduces the risk of rockbursts. Among rockburst prevention measures, large-diameter borehole stress relief and blasting to break the roof and floor are widely recognized by experts, scholars, and field personnel. Large-diameter borehole stress relief involves drilling large-diameter boreholes in the sides and floor of the roadway to release the surrounding rock stress through borehole deformation, thereby achieving stress relief and reducing the risk of rockbursts. Blasting to break the roof and floor involves using blasting to separate the roof and floor of the coal seam, disrupting their integrity and reducing stress transmission and energy accumulation.

[0004] In large-diameter drilling and blasting to break the bottom, bottom plate drilling (i.e., downward drilling) is essential. Existing mining drilling rigs are mainly used for horizontal or upward drilling. During drilling, water is injected into the borehole through the center of the hollow drill rod, and the drill cuttings mix with the water and flow out actively from the gap between the drill rod and the borehole wall. However, when drilling downwards into the bottom plate, the drill cuttings cannot flow out actively and can only accumulate in the core of the hollow drill rod. When the core of the drill rod is almost full, the drill rod is lifted to empty the drill cuttings, and then the drill rod is lowered to continue drilling. This process is repeated until the drilling depth is reached, resulting in very low drilling efficiency. This makes bottom plate drilling difficult, leading to resistance to it in on-site construction. Consequently, other measures are adopted to replace bottom plate pressure relief holes and blasting to break the bottom, increasing workload while reducing pressure relief effect and increasing on-site safety hazards. In view of this, the present invention addresses the problem of drilling holes in the floor of coal mines by proposing a rapid drilling device and method for the floor of coal mine roadways, which greatly improves the drilling efficiency of the floor of coal mine roadways, ensures the pressure relief effect of the floor, and provides further technical support for safe production on site.

[0005] Chinese patent application number 2022100192133 discloses a dry and wet slag removal device for bottom plate drilling. Although this technology also involves injecting water into the borehole and then using negative pressure to extract the drill cuttings, it sets up a separate slag removal device outside the drill rod. This means that drilling and slag removal are two separate systems. It is not clear from the description whether slag removal is carried out simultaneously with drilling. However, in any case, this technology cannot achieve the purpose of the present invention, which integrates the drill rod and slag removal into an integrated structure to achieve simultaneous drilling and slag removal. Summary of the Invention

[0006] This invention addresses the challenges of difficult and inefficient drilling of the floor slab during on-site construction by proposing a rapid drilling device and method for coal mine roadway floor slabs that is suitable for drilling floor slabs and offers high speed and efficiency.

[0007] Glossary: ​​The terms "top" and "bottom" in the technical solution of this invention are defined according to the state of the drill rod when it is used for drilling on the base plate.

[0008] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0009] A rapid drilling device for the floor of a coal mine roadway includes a drilling rig, a drill rod mounted on the drill arm of the drilling rig, and a drill bit located at the front end of the drill rod. The drill rod is characterized by comprising a transition drill rod and a circular drill rod. The top and bottom ends of the transition drill rod are respectively connected to the drilling rig and the circular drill rod via threads. The other end of the circular drill rod is connected to the drill bit via a thread. All threaded connections are required to be sealed to prevent water from the water supply pipe from flowing into the drilling rig and the core of the drill rod, and to prevent air leakage from the water extraction pipe. Wherein:

[0010] The drilling rig is a mobile drilling rig with a water supply pipe running through the drill arm;

[0011] The transition drill rod is a hollow drill rod with a water pumping pipe at its center. The water pumping pipe extends upward through the water supply pipe. Four axial through holes are provided at the wall thickness position of the transition drill rod, and the four axial through holes are connected to the water supply pipe.

[0012] The circular drill rod is also a hollow drill rod. The water pumping pipe of the transition drill rod passes through the center of the circular drill rod. Four axial through holes are also provided at the wall thickness position of the circular drill rod. When the top of the transition drill rod is connected to the drilling machine joint, the four through holes of the circular drill rod are connected to the four through holes of the transition drill rod.

[0013] The drill bit is also hollow, with four water supply holes on its wall. When the drill bit is installed at the bottom of the circular drill bit, the four water supply holes are connected to the four axial through holes of the circular drill rod. Thus, during drilling, the water injected from the water supply pipe flows sequentially through the transition drill rod through hole, the circular drill rod through hole, and the drill bit water supply hole into the bottom of the hole. The water at the bottom of the hole, carrying drill cuttings, is extracted sequentially through the hollow drill bit, the circular drill rod pumping pipe, the transition drill rod pumping pipe, and the drill arm pumping pipe under external negative pressure.

[0014] Furthermore, to prevent the water supply pipe and the pumping pipe from rotating along with the drill rod, the top and bottom ends of the water supply pipe are fixed to the drill arm of the drilling rig by bearings, and the top and bottom ends of the transition drill rod pumping pipe and the circular drill rod pumping pipe are also fixed to the inner wall of the transition drill rod and the inner wall of the circular drill rod by bearings, respectively.

[0015] Furthermore, the threaded connection structure between the drilling rig and the transition drill rod is as follows: the inner wall of the top end of the transition drill rod's water pumping pipe is provided with an internal thread, the outer wall of the bottom end of the drilling rig's water pumping pipe is provided with an external thread, and the outer wall of the top end of the transition drill rod is also provided with an external thread. When the transition drill rod is screwed into the drilling rig joint, the transition drill rod's water pumping pipe is also screwed onto the drilling rig's water pumping pipe. At this time, the drilling rig's water supply pipe and the through hole of the transition drill rod are also connected.

[0016] Further: The threaded connection structure between the transition drill rod and the circular drill rod is as follows: a threaded joint extends from the bottom end of the transition drill rod, and a threaded mounting head extends from the top end of the circular drill rod. When the joint and the mounting head are screwed together by the threads, the water pumping pipe of the transition drill rod and the water pumping pipe of the circular drill rod are tightly aligned and connected. At the same time, the through hole of the transition drill rod and the through hole of the circular drill rod are also tightly aligned and connected.

[0017] Further: The connection method between the circular drill rod and the drill bit is as follows: an internal thread is provided on the inner wall of the drill bit cavity, and an external threaded connector extends from the bottom end of the circular drill rod. The two are connected as one unit by the thread. At this time, the water pumping pipe of the circular drill rod is naturally connected to the drill bit cavity, and the water supply hole of the drill bit is also tightly aligned and connected with the through hole of the circular drill rod.

[0018] Furthermore, in order to accommodate drilling at different hole depths, the circular drill rods are multiple in number and are connected by threads, in the same way as the connection between the transition drill rod and the circular drill rod.

[0019] Further details: The drill bit's water supply hole is shaped like an inverted frustum, meaning the water supply hole is larger at the top and smaller at the bottom.

[0020] Method for rapidly drilling holes in the floor of coal mine roadways using the aforementioned rapid drilling device:

[0021] Step 1: Install the transition drill rod onto the bottom connector of the drilling rig in sequence, connect the round drill rod to the transition drill rod, connect the round drill bit to the round drill rod, and connect the water supply pipe and the pumping pipe to the water supply system and the pumping magma purification system respectively.

[0022] Step 2: Start the water supply and power supply systems of the mobile drilling rig, start the water pumping magma purification system, and start drilling the bottom plate hole. During the drilling process, the water injected from the water supply pipe flows into the bottom of the hole through the transition drill rod through hole, the circular drill rod through hole and the drill bit water supply hole in sequence. At the bottom of the hole, the drill cuttings are carried up from the center of the drill rod under the negative pressure of the water pumping magma purification system, so that continuous drilling can be carried out.

[0023] Step 3: When the drill rod length cannot reach the drilling depth, shut off the water supply system and the pumping magma purification system of the traveling drill rig, rotate the transition drill rod in the opposite direction to separate the transition drill rod from the central drill rod, leaving the central drill rod in the hole, then lift the transition drill rod, install another circular drill rod at the bottom of the transition drill rod, and then connect the newly installed circular drill rod to the circular drill rod left in the hole, and turn on the water supply system and the pumping magma purification system again to continue drilling. Repeat this process until the required drilling depth is reached.

[0024] Step 4: After drilling is completed, shut down the water supply and power supply systems of the mobile drilling rig, shut down the magma pumping and purification system, and then disassemble the circular drill rods one by one until the circular drill bit is completely disassembled, thus completing the drilling operation.

[0025] The advantages of this invention are:

[0026] 1. This invention involves opening a water supply hole in the drill rod wall, inserting a water pumping pipe into the center of the drill rod, and then using negative pressure to continuously extract drilling mud from the center of the drill rod during drilling. This eliminates the need for special drill bit removal and cuttings disposal, shortens the drilling progress, greatly improves drilling efficiency, ensures the pressure relief effect on the base plate, and provides technical support for safe production on site.

[0027] 2. The present invention incorporates a transition drill rod between the drill rod and the drilling rig, which ensures that the water supply pipe is not affected when replacing the round drill rod, thus guaranteeing the continuous connection between the water supply pipe and the drill rod through hole in real time, shortening the time required to add the round drill rod, and further improving drilling efficiency. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. The accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a simplified diagram of the rapid drilling device for the floor of a coal mine roadway according to the present invention;

[0030] Figure 2a This is a front cross-sectional view of the water pumping pipe and water supply pipe of the present invention in the drilling rig. Figure 2b yes Figure 2a Section 1-1 in the diagram;

[0031] Figures 3a-3e This is a structural diagram of the transition drill pipe of the present invention, wherein, Figure 3a For the transition drill pipe, see the main view section. Figures 3b-3d They are respectively Figure 3a Sectional views 2-2, 3-3, and 4-4. Figure 3e Is set at Figure 3a Top view of the annular gasket at the lower end of the pumping pipe;

[0032] Figures 4a-4e This is a structural diagram of the circular drill pipe of the present invention, wherein, Figure 4a This is a front sectional view of a circular drill pipe. Figures 4b-4e They are respectively Figure 4a Sectional views of sections 5-5, 6-6, 7-7, and 8-8;

[0033] Figures 5a-5e This is a structural diagram of the drill bit of the present invention, wherein, Figure 5a This is a front view sectional view of the drill bit; Figures 5b-5c They are respectively Figure 5a Sectional views 9-9 and 10-10, Figures 5d-5e yes Figure 5c Cross-sectional views of sections 11-11 and 12-12.

[0034] Figure 6 This is an assembly drawing of an embodiment of the present invention.

[0035] In the picture:

[0036] 1-Drilling rig, 1.1-Drilling rig joint, 1.2-Traveling frame, 1.3-First bearing, 1.4-First internal thread, 1.5-Water supply pipe, 1.6-First external thread, 1.7-First pumping pipe, 1.8-First sealing gasket;

[0037] 2-Transition drill pipe, 2.1-Transition drill pipe cavity, 2.2-Second bearing, 2.3-Second sealing washer, 2.4-Transition drill pipe wall, 2.5-Annular gasket, 2.6-Third external thread, 2.7-Joint, 2.8-Second external thread, 2.9-First through hole, 2.10-First flat recess, 2.11-Second pumping pipe, 2.12-Second internal thread, 2.13-Sealing gasket;

[0038] 3-Circular drill rod, 3.1-Circular drill rod cavity, 3.2-Third bearing, 3.3-Circular drill rod wall, 3.4-First mounting head, 3.5-Second through hole, 3.6-Second flat concave platform, 3.7-Third pumping pipe;

[0039] 4-Drill bit, 4.1-Water supply hole, 4.2-Second mounting head, 4.3-Inner wall of drill bit, 4.4-Third flat recess;

[0040] 5- Pumping magma purification system;

[0041] 6-Water pumping pipeline;

[0042] 7-Water supply pipeline. Detailed Implementation

[0043] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0044] like Figure 1 As shown, the rapid drilling device for coal mine roadway floor of the present invention mainly includes a drilling rig 1, a transition drill rod 2 mounted on the drilling rig connector 1.1, a circular drill rod 3 mounted at the bottom of the transition drill rod 2, a drill bit 4 mounted at the bottom of the circular drill rod 3, a water pumping pipeline 6, and a water supply pipeline 7. In use, the water pumping pipeline 6 needs to be connected to a water pumping magma purification system 7. The water pumping magma purification system 7 is a suction pump with a filtration function. The suction pump is connected to the water pumping channel of the drilling rig through the suction pipeline. The suction pump draws out the water containing rock fragments from the borehole, and the filtered water is injected into the on-site water circulation system for later use. The rock fragments are recycled and processed.

[0045] Drilling rig 1 is an improvement on the existing drilling rig, except that a traveling frame 1.2 is added, on which drilling rig 1 is mounted for free movement. Figures 2a-2b It can be seen that a water supply pipe 1.5 runs through the drill arm of drill rig 1, and the water supply pipe 1.5 is connected to the water supply pipeline 7; a first pumping pipe 1.7 runs through the water supply pipe 1.5, and the top and bottom ends of the water supply pipe 1.5 are fixed to the drill arm by the first bearing 1.3 respectively. A first sealing gasket 1.8 is provided around the first bearing 1.3. The purpose of designing the first sealing gasket 1.8 is to prevent water leakage.

[0046] Reference Figures 3a-3e The transition drill rod 2 is a hollow rod body. Four axial first through holes 2.9 are provided at the wall thickness 2.4 of the transition drill rod. A second water-drawing pipe 2.11 is provided inside the cavity 2.1 of the transition drill rod. The top and bottom ends of the second water-drawing pipe 2.11 are fixed to the inner wall of the cavity 2.1 of the transition drill rod by second bearings 2.2. The outer wall of the top end of the transition drill rod has a second external thread 2.8, and the inner wall of the second water-drawing pipe 2.11 has a second internal thread 2.12. When the transition drill rod 2 is screwed into the drill rod joint through the second external thread 2.8, the second water-drawing pipe 2.11 is also tightly screwed onto the first external thread 1.6 of the first water-drawing pipe 1.7 through the second internal thread 2.12 and the second sealing washer 2.3. This allows the transition drill rod 2 to be installed on the drill joint 1.1, simultaneously achieving communication between the second water-drawing pipe 2.11 and the first water-drawing pipe 1.7.

[0047] from Figure 3a As can be seen, in order to connect the transition drill rod 2 and the circular drill rod 3 and ensure the continuity between the first through hole 2.9 and the second through hole 3.5, a connector 2.7 for mounting the circular drill rod 3 extends from the bottom of the transition drill rod 2. The connector 2.7 has a third external thread 2.6 on its periphery, and the bottom end of the second pumping pipe 2.11 is actually fixed to the inner wall of the connector 2.7. Of course, in practice, the connector 2.7 and the transition drill rod 2 are integral and not post-processed. To facilitate the clamping of the installation tool, the outer wall of the transition drill rod 2 has a first flat recess 2.10 (see... Figure 3e ).

[0048] Reference Figures 4a-4e The structure of the circular drill rod 3 is described in the figure. As can be seen from the figure, the structure of the circular drill rod 3 is similar to that of the transition drill rod 2, also being a hollow rod. Four axial second through holes 3.5 are provided at the wall thickness 3.3 of the circular drill rod. The cavity 3.1 of the circular drill rod has a third water-pumping pipe 3.7, which is fixed to the inner wall of the cavity 3.1 of the circular drill rod via a third bearing 3.2. An internally threaded mounting head 3.4 extends from the outer wall of the top of the circular drill rod. As can be seen from the figure, the second through holes 3.5 also pass through the wall of the mounting head 3.4. Thus, when the connector 2.7 of the transition drill rod 2 is screwed into the mounting head 3.4, the bottom end of the first through hole 2.9 and the top end of the second through hole 3.5 are tightly aligned and connected. At the same time, the second water-pumping pipe 2.11 and the third water-pumping pipe 3.7 are also tightly aligned and connected. Of course, it is necessary to provide an annular gasket 2.5 at the alignment position of the first through hole 2.9 and the second through hole 3.5, or to take other sealing measures. Obviously, to achieve the connection between the second water pipe 2.11 and the third water pipe 3.7, both need to be made of rigid materials. To ensure a proper seal between them, a sealing gasket must be added, such as... Figure 3aThe sealing gasket 2.13 is shown at the bottom end of the second water pumping pipe 2.11.

[0049] from Figure 4a As can be seen, in order to connect the circular drill rod 3 to the drill bit 4, the bottom structure of the circular drill rod 3 adopts the same structure as the bottom structure of the transition drill rod 2, including the joint with the same structure, which will not be described in detail here. To facilitate tool clamping, the outer wall of the circular drill rod 3 is also provided with a flat recess, called the second flat recess 3.6 (see...). Figure 4b ).

[0050] Reference Figures 5a-5e The drill bit structure of this invention is described. The drill bit 4 is a hollow cross drill bit. An alloy wall is welded to the outside of the drill bit 4, and four water supply holes 4.1 are provided on the alloy wall for supplying water during the drilling process. In this embodiment, the water supply holes 4.1 are located at the cross-shaped position of the drill bit. A second mounting head 4.2 is provided at the top of the drill bit 4. The inner wall of the second mounting head 4.2 has internal threads. The four water supply holes 4.1 extend upwards through the wall of the second mounting head 4.2. Thus, when the second mounting head 4.2 is screwed onto the connector at the bottom of the circular drill rod 3, the third water suction pipe 3.7 naturally communicates with the inner cavity of the drill bit 4. The second through hole 3.5 is tightly aligned and communicates with the water supply holes 4.1. The outer wall of the drill bit 4 also has a flat concave platform, referred to as the third flat concave platform 4.4. Similarly, to prevent water leakage, a sealing gasket is also required at the mating point. It should be noted that the drill bit of this invention is an improvement on the existing cross drill bit. The main improvement is the addition of a water supply hole on the drill bit body. The drill bit shape, the need for a cutting edge on the drill bit, and the fact that the outer diameter of the drill bit is larger than that of the drill rod are all common knowledge in the art and will not be detailed here. In another embodiment, the water supply hole 4.1 is conical, with a larger diameter at the top and a smaller diameter at the bottom. This is based on the shape of the drill bit and is also to ensure that the drilling slurry at the bottom of the hole can be smoothly pumped to the magma purification system. Figure 5a It can also be seen that the lower surface of the cross drill bit is serrated, and the inner cavity of the cross drill bit is conical, meaning that the cross drill bit is beveled, with the four corners of the cross being high and the intersection point in the middle of the cross being low (see...). Figure 5a ).

[0051] To facilitate the lifting and replacement of the drill rod, the first water pumping pipe 1.7 of this invention is preferably a retractable flexible hose. In this case, a rigid external thread head needs to be provided at the end of the first water pumping pipe 1.7. The second water pumping pipe 2.11 can be screwed onto the thread head to achieve the connection between the first and second water pumping pipes.

[0052] Although the transition drill rod and the round drill rod of this invention have similar structures, their functions in drilling differ. The transition drill rod primarily acts as a bridge, providing a quick and convenient way to replace the round drill rod. It also protects the water supply pipe, preventing it from being exposed during replacement. Therefore, the transition drill rod is not as long as the round drill rod. The main function of the round drill rod is to drive the drill bit in drilling. Therefore, round drill rods can be available in multiple specifications to accommodate increasing drill rod length on-site. Round drill rods are also connected by threads, such as... Figure 6 This is an assembly drawing of an embodiment consisting of two sections of circular drill rod. As can be seen from the drawing, the connection method is the same as that between the circular drill rod and the transition drill rod.

[0053] The following describes how to use the device of the present invention.

[0054] (1) Connect the pumping pipe 6 of the pumping magma purification system 5 to the first pumping pipe 1.7 of the drilling rig 1, connect the external water supply pipe 7 to the water supply pipe 1.5, and install the transition drill rod 2 onto the drilling rig joint 1.1.

[0055] (2) Connect the circular drill rod 3 to the transition drill rod 2. During the connection process, ensure that the second flat concave platform 3.6 of the circular drill rod and the first flat concave platform 2.10 of the transition drill rod are on a straight line to ensure the smooth connection of the water supply through hole.

[0056] (3) Connect the circular drill bit 4 to the circular drill rod 3. During the connection process, the second flat concave platform 3.6 of the circular drill rod and the third flat concave platform 4.4 of the circular drill bit are on the same straight line to ensure the smooth connection of the water supply hole.

[0057] (4) Turn on the water supply system and power supply system of the drilling rig, turn on the pumping magma purification system 5, and drill the bottom plate hole. During the drilling process, increase the number of circular drill rods 3 in a timely manner according to the drilling depth.

[0058] (5) After drilling is completed, shut down the water supply system and power supply system of the drilling rig, shut down the pumping magma purification system 5, and then disassemble the circular drill rod 3 in sequence until the circular drill bit 4 is completely disassembled, and the drilling construction is completed.

[0059] The above are embodiments of the present invention and are not intended to limit the technical solution of the present invention. It should be noted that the threaded connection structure between drill rods and between drill rods and drill bits should ensure that the threaded connection between them becomes increasingly tight during drilling. This requires limiting the direction of the threads according to the drilling direction. How to design this is common knowledge in the art. In addition, the implementation of the present invention involves water supply and slurry pumping, so all connections should be sealed as much as possible. Therefore, the scope of protection is determined by the scope described in the claims.

Claims

1. A coal mine roadway floor rapid drilling device, comprising a drilling machine, a drill rod mounted on a drilling arm of the drilling machine, and a drill bit arranged at a front end of the drill rod, characterized in that, The drill pipe is composed of a transition drill pipe and a circular drill pipe, the top end and the bottom end of the transition drill pipe are respectively connected with a drilling machine and the circular drill pipe through threads, the other end of the circular drill pipe is connected with a drill bit through threads, sealing measures are required at the thread connection positions, on the one hand, to prevent water in the water supply pipe from flowing into the drilling machine and the core of the drill pipe, and on the other hand, to prevent the water suction pipe from leaking air, wherein: The drilling machine is a movable drilling machine, and a water supply pipe is arranged through the drilling arm; The transition drill pipe is a hollow drill pipe, a water suction pipe is arranged in the center of the transition drill pipe, the water suction pipe penetrates the water supply pipe upwards, and four axial through holes are arranged at the wall thickness position of the transition drill pipe, the four axial through holes are in communication with the water supply pipe; The circular drill pipe is also a hollow drill pipe, the water suction pipe of the transition drill pipe penetrates the center of the circular drill pipe, and four axial through holes are also arranged at the wall thickness position of the circular drill pipe, when the top end of the transition drill pipe is connected with the drilling machine connector, the four through holes of the circular drill pipe are in communication with the four through holes of the transition drill pipe; The drill bit is also hollow, four water supply holes are arranged on the wall of the drill bit, when the drill bit is installed at the bottom end of the circular drill pipe, the four water supply holes are in communication with the four axial through holes of the circular drill pipe, in this way, the water injected from the water supply pipe flows through the through holes of the transition drill pipe, the through holes of the circular drill pipe and the water supply holes of the drill bit into the bottom of the hole in sequence during drilling, the water in the bottom of the hole carries the drill cuttings and is extracted under the action of external negative pressure through the hollow drill bit, the water suction pipe of the circular drill pipe, the water suction pipe of the transition drill pipe and the water suction pipe of the drilling arm in sequence. The thread connection structure between the drilling machine and the transition drill pipe is that an inner thread is arranged on the inner wall of the top end of the water suction pipe of the transition drill pipe, an outer thread is arranged on the outer wall of the bottom end of the water suction pipe of the drilling machine, and at the same time, an outer thread is arranged on the outer wall of the top end of the transition drill pipe, when the transition drill pipe is screwed into the drilling machine connector, the water suction pipe of the transition drill pipe is also screwed on the water suction pipe of the drilling machine, at this time, the water supply pipe of the drilling machine and the through hole of the transition drill pipe are also in communication.

2. The coal mine roadway floor rapid drilling device according to claim 1, characterized in that, The top end and the bottom end of the water supply pipe are fixed on the drilling arm of the drilling machine through bearings, and the top end and the bottom end of the water suction pipe of the transition drill pipe and the water suction pipe of the circular drill pipe are respectively fixed on the inner wall of the transition drill pipe and the inner wall of the circular drill pipe through bearings.

3. The coal mine roadway floor fast drilling device of claim 1, wherein, The thread connection structure between the transition drill pipe and the circular drill pipe is that a threaded connector is extended from the bottom end of the transition drill pipe, and a threaded mounting head is extended from the top end of the circular drill pipe, when the connector and the mounting head are screwed together through threads, the water suction pipe of the transition drill pipe and the water suction pipe of the circular drill pipe are in close communication, at the same time, the through hole of the transition drill pipe and the through hole of the circular drill pipe are also in close communication.

4. The coal mine roadway floor fast drilling device of claim 3, wherein, The connection mode between the circular drill pipe and the drill bit is that an inner thread is arranged on the inner wall of the hollow cavity of the drill bit, and an outer threaded connector is extended from the bottom end of the circular drill pipe, the two are connected into one through threads, at this time, the water suction pipe of the circular drill pipe is naturally in communication with the hollow cavity of the drill bit, and at the same time, the water supply hole of the drill bit is also in close communication with the through hole of the circular drill pipe.

5. The coal mine roadway floor fast drilling device of claim 1, wherein, The circular drill pipe includes multiple circular drill pipes, and the circular drill pipes are also connected through threads, and the connection mode is the same as the connection mode between the transition drill pipe and the circular drill pipe.

6. The coal mine roadway floor fast drilling device of claim 1, wherein, The water supply hole of the drill bit is in the shape of an inverted frustum of a cone, that is, the water supply hole is large at the top and small at the bottom.

7. The method for rapidly drilling the coal mine roadway floor by using the coal mine roadway floor rapid drilling device of claim 1, characterized in that, First step: install transition drill pipe on the bottom joint of the drilling machine, connect the circular drill pipe to the transition drill pipe, connect the circular drill bit to the circular drill pipe, and connect the water supply pipe and the water pumping pipe to the water supply system and the water-magma static system respectively; Second step: start the water supply system and the power supply system of the walking drilling machine, start the water-magma static system, and drill the bottom hole. During the drilling process, the water injected from the water supply pipe flows into the bottom of the hole through the transition drill pipe hole, the circular drill pipe hole, and the drill bit water supply hole, and carries the drill cuttings to the top of the drill pipe under the negative pressure of the water-magma static system. In this way, continuous drilling can be implemented; Third step: when the length of the drill pipe does not reach the drilling depth, close the water supply system and the water-magma static system of the walking drilling machine, rotate the transition drill pipe in the opposite direction, and make the transition drill pipe separate from the circular drill pipe. Then, lift the transition drill pipe, install another circular drill pipe at the lower part of the transition drill pipe, connect the newly installed circular drill pipe with the circular drill pipe left in the hole, and continue drilling by starting the water supply system and the water-magma static system again. Repeat the above steps until the required drilling depth is reached; Fourth step: after the drilling is completed, close the water supply system and the power supply system of the walking drilling machine, and close the water-magma static system. Then, disassemble the circular drill pipe in sequence until the circular drill bit is disassembled, and the drilling construction is completed.

Images