A drill pipe type automatic hole sealing device

Abstract

The present invention relates to a drill pipe type automatic hole sealing device, belonging to the technical field of hole sealing for gas drainage boreholes in coal mines. It includes a rear plug pipe, at least one material carrying pipe, and a front plug pipe that are sequentially arranged and can all be detachably connected to the active drill pipe of the drill rig. The adjacent ends of the rear plug pipe, the material carrying pipe, and the front plug pipe can form a threaded connection. All three have central holes and are interconnected with each other to form a water injection channel. Annular grooves are provided on the circumferences of the rear plug pipe and the front plug pipe, and rubber sleeves that expand when filled with water are provided in the two annular grooves to fit with the borehole wall to form a hole sealing area. A pressure valve is provided at the front end of the front plug pipe. The material carrying pipe has a first storage cavity, a mixing cavity, and a second storage cavity arranged sequentially along its axial direction, and a discharge port is provided on the circumference of the mixing cavity. The present invention realizes the compatibility between the hole sealing device and the drill pipe structure, can use the drilling device to achieve mechanized hole sealing, and realizes the continuity of the two processes of automatically lowering the hole sealing device and automatically injecting the hole sealing material, with a high degree of automation.

Description

Technical Field

[0001] The invention belongs to the technical field of gas drainage borehole sealing in coal mines and relates to a drill pipe type automatic sealing device. Background Art

[0002] At present, a bag type sealing device is generally used for sealing boreholes in coal mines. This method requires manual assembly of the sealing device underground, manual lowering of the sealing device, and separate lowering of the gas drainage pipe. Finally, a separate grouting machine is used for grouting to complete the sealing. This method has the following disadvantages: (1) Manual sealing is required, and the degree of automation of sealing is low; (2) The steps are cumbersome, the labor intensity of workers is high, and some workers seal the boreholes irregularly. In view of the above two deficiencies, relevant scholars have developed an automatic sealing device, but the current automatic sealing device has the following disadvantages: (1) The process of automatically lowering the sealing device and automatic grouting is not continuous, and the degree of automation needs to be improved; (2) The sealing device is limited by the sealing principle and uses metal materials. After grouting and sealing, it cannot be taken out. When the coal mining machine cuts the sealing device in the coal seam during later mining, sparks will be generated, which is very likely to cause a gas accident; (3) The flow channel structure of the sealing device is complex. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a drill pipe type automatic sealing device to achieve the continuity of the two processes of automatically lowering the sealing device and automatically injecting the sealing material.

[0004] To achieve the above purpose, the invention provides the following technical solutions:

[0005] A drill pipe type automatic sealing device includes a rear plugging pipe, at least one material-carrying pipe, and a front plugging pipe that are sequentially arranged and the rear ends of which can be detachably connected to the active drill pipe of the drill rig; the adjacent ends of the rear plugging pipe, the material-carrying pipe, and the front plugging pipe can form a threaded connection, and the thread helix direction is the same as the rotation direction of the drill rig during drilling; the rear plugging pipe, the material-carrying pipe, and the front plugging pipe all have a central hole and are interconnected to form a water injection channel; annular grooves are provided on the circumferences of the rear plugging pipe and the front plugging pipe, and rubber sleeves that expand when filled with water are arranged in the two annular grooves to fit with the borehole wall to form a sealing area; water passing holes communicating the rubber sleeves and the water injection channel are provided on the rear plugging pipe and the front plugging pipe, and a water flow check valve is arranged at the water passing holes; a pressure valve is provided at the front end of the front plugging pipe to automatically block the water injection channel under a certain water pressure; the material-carrying pipe has a first material storage cavity, a mixing cavity, and a second material storage cavity that are sequentially arranged along its axial direction; the other ends of the first material storage cavity and the second material storage cavity are provided with water inlets, and a first pressure one-way valve is arranged at the water inlets to control the on-off of the water inlets. Pushing slide rings are arranged in the first material storage cavity and the second material storage cavity to push the sealing material in the corresponding material storage cavity towards the mixing cavity under the action of water pressure; second pressure one-way valves are arranged at both ends of the mixing cavity, and a discharge port is arranged on the circumference to discharge the sealing material entering the mixing cavity from the first material storage cavity and the second material storage cavity to the sealing area.

[0006] Optionally, the pressure valve is an eccentric valve that automatically closes under a certain water pressure. It includes a left valve body with a left channel, a right valve body with a right channel, a valve core fixedly connected to the left valve body, and a spring sleeved on the valve core. The right valve body is fixedly connected to the front plugging pipe, the left valve body is slidably connected to the front plugging pipe, the other end of the valve core passes through the right valve body and is slidably connected thereto. A limiting member is further provided on the valve core to prevent the right valve body from disengaging from it. The opposite surfaces of the left valve body and the right valve body can be attached, and when attached, the left channel and the right channel are not connected. The spring is located between the left valve body and the right valve body.

[0007] Optionally, the opposite surfaces of the left valve body and the right valve body are conical surfaces.

[0008] Optionally, the first storage cavity and the second storage cavity are annular and have the same radial dimension, and the radial dimension of the mixing cavity is larger than that of the first storage cavity and the second storage cavity.

[0009] Optionally, the belt material pipe includes a first belt material pipe and a second belt material pipe that are detachably connected. The first belt material pipe has a first storage cavity, the second belt material pipe has a second storage cavity. The connecting end of the first belt material pipe and the second belt material pipe has an annular cavity that communicates with the corresponding storage cavity and has a radial dimension larger than that of the corresponding storage cavity. Second pressure one-way valves are provided at one ends of the first storage cavity and the second storage cavity close to the annular cavity. The two second pressure one-way valves and the annular cavity enclose a mixing cavity.

[0010] Optionally, the annular groove includes a first annular groove and a second annular groove that are sequentially arranged from inside to outside in the radial direction, and the length of the second annular groove is greater than that of the first annular groove to form a stepped shape with a smaller inner part and a larger outer part. The rubber sleeve is installed in the second annular groove.

[0011] Optionally, the rubber sleeve and the annular groove are adhesively connected.

[0012] Optionally, the drill rod type automatic hole sealing device is made of materials with flame retardant and antistatic properties.

[0013] Optionally, the material of the rubber sleeve is natural rubber, and the material of the push rod sliding ring is polytetrafluoroethylene.

[0014] The beneficial effects of the present invention are as follows:

[0015] (1) For the drill rod type automatic hole sealing device disclosed in the present invention, the water injection and the gas drainage share a common channel, and the internal flow channel is simple. In the hole sealing stage: the channel of the hole sealing device serves as the water injection channel, and water is injected by using a drilling rig. The pressure valve closes, and the rubber sleeves of the front and rear plugging pipes are filled with water and expand to fit with the hole wall of the borehole, forming an annular closed space; continue to inject water, and the hole sealing material is squeezed into the annular closed space and completes the hole sealing after reaction; in the gas drainage stage: stop injecting water, the pressure valve automatically opens, the gas flow channel is connected, and the water injection channel of the hole sealing device is converted into a gas drainage channel for gas drainage.

[0016] (2)The automatic hole - sealing device of drill pipe type disclosed by the present invention automatically lowers the hole - sealing device through an automatic drill, and at the same time injects water flow to extrude the hole - sealing liquid to complete hole - sealing, realizing the continuity of the two processes of automatically lowering the hole - sealing device and automatically injecting the hole - sealing material, with a high degree of automation.

[0017] (3)The automatic hole - sealing device of drill pipe type disclosed by the present invention uses an automatic drill for hole - sealing, reducing the labor intensity of workers, standardizing the hole - sealing process, and improving the hole - sealing efficiency.

[0018] (4)The automatic hole - sealing device of drill pipe type disclosed by the present invention is made of materials with flame - retardant and antistatic properties. After the gas drainage is completed, there is no need to remove the hole - sealing device, and the hole - sealing device in the coal body can be directly cut, facilitating coal mining.

[0019] Other advantages, objectives, and features of the present invention will, to some extent, be described in the subsequent specification, and to some extent, will be obvious to those skilled in the art based on the study of the following text, or can be learned from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be described in detail preferably with reference to the accompanying drawings, where:

[0021] Figure 1 is a schematic structural diagram of an automatic hole - sealing device of drill pipe type of the present invention;

[0022] Figure 2 is a schematic structural diagram of the rear plugging pipe;

[0023] Figure 3 is a schematic structural diagram of the material - carrying pipe;

[0024] Figure 4 is a schematic structural diagram of the first material - carrying pipe;

[0025] Figure 5 is a schematic structural diagram of the result of the second material - carrying pipe;

[0026] Figure 6 is a schematic structural diagram of the front plugging pipe;

[0027] Figure 7 is a schematic structural diagram of the pressure valve.

[0028] Reference numerals: rear blocking pipe 1, material feeding pipe 2, front blocking pipe 3, rear blocking pipe body 11, first rubber sleeve 12, first water flow check valve 13, first material feeding pipe 21, mixing chamber 22, discharge port 23, second material feeding pipe 24, first one-way valve 211, first material feeding pipe pushing sliding ring 212, first material feeding pipe body 213, A material storage chamber 214, second one-way valve 215, first material feeding pipe discharge port 216, first material feeding pipe mixing chamber 217, third one-way valve 241, second material feeding pipe pushing sliding ring 242, second material feeding pipe body 243, B material storage chamber 244, fourth one-way valve 245, second material feeding pipe discharge port 246, second material feeding pipe mixing chamber 247, front blocking pipe body 31, second rubber sleeve 32, second water flow check valve 33, pressure valve 34, left valve body 341, left channel 342, spring 343, right valve body 344, valve core retaining ring 345, right channel 346, valve core 347. Detailed implementation manners

[0029] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0030] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0031] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] Refer to Figures 1 to 7, a drill pipe type automatic hole sealing device, comprising a rear plugging pipe 1, at least one material carrying pipe 2, and a front plugging pipe 3 which are sequentially arranged and the rear ends of which can be detachably connected to the active drill pipe of the drill rig; the adjacent ends of the rear plugging pipe 1, the material carrying pipe 2, and the front plugging pipe 3 can form a threaded connection, and the thread helix direction is the same as the rotation direction during the drilling of the drill rig; the rear plugging pipe 1, the material carrying pipe 2, and the front plugging pipe 3 all have central holes and are interconnected with each other to form a water injection channel; annular grooves are provided on the circumferences of the rear plugging pipe 1 and the front plugging pipe 3, and water-filled and expandable rubber sleeves are arranged in the two annular grooves to fit with the hole wall of the borehole to form a hole sealing area; water passing holes communicating the rubber sleeve and the water injection channel are provided on the rear plugging pipe 1 and the front plugging pipe 3, and a water flow check valve is arranged at the water passing holes; a pressure valve 34 is provided at the front end of the front plugging pipe 3 to automatically block the water injection channel under a certain water pressure; the material carrying pipe 2 has a first storage cavity, a mixing cavity 22, and a second storage cavity which are sequentially arranged along its axial direction; water inlets are provided at the other ends of the first storage cavity and the second storage cavity, and a first pressure one-way valve is arranged at the water inlets to control the on-off of the water inlets; a pushing slide ring is arranged in the first storage cavity and the second storage cavity to push the hole sealing material in the corresponding storage cavity towards the mixing cavity 22 under the action of water pressure; second pressure one-way valves are provided at both ends of the mixing cavity 22, and a discharge port 23 is provided on the circumference. The hole sealing materials entering the mixing cavity 22 from the first storage cavity and the second storage cavity are mixed in the mixing cavity 22 and then enter the hole sealing area through the discharge port 23.

[0033] In the present invention, water injection and gas drainage share one channel, and the internal flow channel is simple. During the hole sealing stage, the channel of the hole sealing device serves as the water injection channel, and water is injected by the drill rig. The pressure valve 34 is closed, and the rubber sleeves of the front and rear plugging pipes are filled with water and expanded to fit with the hole wall, forming an annular closed space; continuous water injection causes the hole sealing liquid to be squeezed into the annular closed space, and the hole sealing is completed after the reaction. During the gas drainage stage: water injection is stopped, the pressure valve 34 automatically opens, the gas flow channel is connected, and the water injection channel of the hole sealing device is converted into a gas drainage channel for gas drainage. The present invention realizes the continuity of the two processes of automatically lowering the hole sealing device and automatically injecting the hole sealing material by automatically lowering the hole sealing device by the automatic drill rig and simultaneously injecting water to squeeze out the hole sealing liquid, with a high degree of automation.

[0034] The pressure valve 34 is an eccentric normally open valve that automatically closes under a certain water pressure. It includes a left valve body 341 provided with a left channel 342, a right valve body 344 provided with a right channel 346, a valve core 347 fixedly connected to the left valve body 341, a spring 343 sleeved on the valve core 347. The right valve body 344 is fixedly connected to the front plugging pipe 3, the left valve body 341 is slidably connected to the front plugging pipe 3, the other end of the valve core 347 passes through the right valve body 344 and is slidably connected thereto. A limiting member is also provided on the valve core 347 to prevent the right valve body 344 from disengaging from it. The opposite surfaces of the left valve body 341 and the right valve body 344 can be fitted, and when they are fitted, the left channel 342 and the right channel 346 are not communicated. The spring 343 is located between the left valve body 341 and the right valve body 344. The opposite surfaces of the left valve body 341 and the right valve body 344 can be plane surfaces or conical surfaces, preferably conical surfaces, for better sealing.

[0035] Optionally, the belt conveyor pipe 2 includes a first belt conveyor pipe 21 and a second belt conveyor pipe 24 that are detachably connected. The first belt conveyor pipe 21 has a first storage cavity, the second belt conveyor pipe 24 has a second storage cavity. The connecting ends of the first belt conveyor pipe 21 and the second belt conveyor pipe 24 have an annular cavity that communicates with the corresponding storage cavity and has a radial dimension larger than the corresponding storage cavity. At one end of the first storage cavity and the second storage cavity close to the annular cavity, a second pressure check valve is provided. The two second pressure check valves and the annular cavity enclose a mixing cavity 22; the first storage cavity and the second storage cavity are annular and have the same radial dimension, and the radial dimension of the mixing cavity 22 is larger than the radial dimensions of the first storage cavity and the second storage cavity; the annular groove includes a first annular groove and a second annular groove arranged sequentially from the inside to the outside in the radial direction, and the length of the second annular groove is greater than that of the first annular groove to form a stepped shape with a smaller inside and a larger outside. The rubber sleeve is installed in the second annular groove; the rubber sleeve and the annular groove are adhesively connected; the drill rod type automatic hole sealing device is made of materials with flame retardant and antistatic properties.

[0036] The material of the rubber sleeve of the present invention is preferably natural rubber, which has good ductility and is convenient for the rubber sleeve to expand; the material of the pushing slide ring is preferably polytetrafluoroethylene, which has a small friction coefficient and is convenient for sliding; the main material of other parts is MC nylon, which has good flame retardant and antistatic properties and has a high strength and can withstand a certain water injection pressure.

[0037] The present invention uses an automatic drill to seal the hole, reducing the labor intensity of workers, standardizing the hole sealing process, improving the hole sealing efficiency, and using MC nylon and natural rubber as the main materials. After the gas drainage is completed, there is no need to remove the hole sealing device, and the hole sealing device in the coal body can be directly cut, which is convenient for coal mining.

[0038] Embodiment

[0039] A drill rod type automatic hole sealing device, such as Figure 1As shown in the figure, it includes a rear plug pipe 1, a material-carrying pipe 2, and a front plug pipe 3 that are sequentially connected by threads. The outer shape of each pipe is the same as that of a drill pipe, and it can be grabbed, connected, and automatically lowered into the drill hole by an automatic drilling rig. The lowering sequence is as follows: first, lower the front plug pipe 3, then lower the material-carrying pipe 2. Multiple material-carrying pipes 2 can be connected to meet the hole-sealing length. Finally, lower the rear plug pipe 1.

[0040] Figure 2 Figure 4 is a schematic structural diagram of the rear plug pipe 1. The rear plug pipe 1 includes a rear plug pipe body 11. A female thread is designed at the left end of the rear plug pipe body 11, which can be connected to the driving drill pipe of the automatic drilling rig. A first rubber sleeve 12 is arranged in the middle of the rear plug pipe body 11. The first rubber sleeve 12 fits with the rear plug pipe body 11 and is fixed and sealed by bonding. A first water check valve 13 is arranged in the middle of the rear plug pipe body 11. The first water check valve 13 is connected and fixed to the rear plug pipe body 11 by bonding. Water can enter the space formed by the rear plug pipe body 11 and the first rubber sleeve 12 from the pipeline, but cannot flow back. When water is passed, the first rubber sleeve 12 expands and fits with the hole wall of the gas drainage hole to complete the front-end plugging. After the water supply stops, the water in the first rubber sleeve 12 cannot flow out, and the first rubber sleeve 12 continuously maintains the expanded state. A male thread is designed at the right end of the rear plug pipe body 11, which can be connected to the female thread structure at the left end of the material-carrying pipe 2 and produce a sealing effect. During hole sealing, when water enters the rear plug pipe 1 and fills the water injection channel, the water will enter the first water check valve 13, and the first rubber sleeve 12 begins to expand until it fits with the wall of the gas drainage drill hole to complete the plugging of the rear end of the hole-sealing device.

[0041] Figure 3 Figure 8 is a schematic structural diagram of the material-carrying pipe 2. The material-carrying pipe 2 carries component A and component B of the polyurethane hole-sealing material, and includes a first material-carrying pipe 21 and a second material-carrying pipe 24. The first material-carrying pipe 21 carries polyurethane component A, and the second material-carrying pipe 24 carries polyurethane component B. A female thread is designed at the left end of the material-carrying pipe 2, which can be connected to the male thread at the right end of the rear plug pipe. A male thread is designed at the right end of the material-carrying pipe 2, which can be connected to the female thread at the left end of the front plug pipe 3. A coaxial male thread structure is designed at the right end of the first material-carrying pipe 21 and is connected to the coaxial female thread structure at the left end of the second material-carrying pipe 24. After connection, a mixing chamber 22 is formed. The mixing chamber 22 is an annular space for mixing polyurethane component A and component B. An outlet 23 is arranged on the large-diameter wall surface of the mixing chamber, which is a circular outlet for flowing out the polyurethane AB component mixed liquid. During hole sealing, component A of the polyurethane hole-sealing material flows out from the first material-carrying pipe 21 at the left end of the material-carrying pipe 2, and component B of the polyurethane hole-sealing material flows out from the second material-carrying pipe 24 at the right end of the material-carrying pipe 2. Component A and component B are mixed in the mixing chamber 22 and then flow out through the outlet 23 and enter the annular space formed by the drill hole and the hole-sealing device, and fully react and expand to form polyurethane rigid foam to complete hole sealing.

[0042] Figure 4It is a schematic structural diagram of the first material conveying pipe 21, which includes a check valve 211, a pusher sliding ring 212 of the first material conveying pipe, a pipe body 213 of the first material conveying pipe, and a check valve 215. The check valve 211 has a certain opening pressure, is adhesively fixed to the pipe body 213 of the first material conveying pipe, and plays a role in positioning the pusher sliding ring 212 of the first material conveying pipe; the pusher sliding ring 212 of the first material conveying pipe fits with the pipe body 213 of the first material conveying pipe, is made of polytetrafluoroethylene material, has a liquid sealing effect. When the A-material storage cavity 214 of the pipe body 213 of the first material conveying pipe is filled with A-material liquid, the pusher sliding ring 212 of the first material conveying pipe is at the left end of the A-material storage cavity and fits with the check valve 211; the A-material storage cavity 214 is filled with polyurethane A-material liquid; the check valve 215 is connected to the A-material storage cavity, is an outlet valve for the polyurethane A-material liquid, has a certain opening pressure, and its opening pressure is required to be greater than the pressure of the polyurethane A-material liquid in the non-working state. The outlet of the check valve 215 is in the direction of the mixing cavity 217 of the first material conveying pipe; the mixing cavity 217 of the first material conveying pipe is located at the right end of the first material conveying pipe 21, and the outlet 216 of the first material conveying pipe is on the large-diameter wall surface of the mixing cavity 217 of the first material conveying pipe, which is a circular outlet, and its function is to discharge the polyurethane AB-material mixture; during hole sealing, water with a certain pressure flows into the check valve 211, then pushes the pusher sliding ring 212 of the first material conveying pipe to move to the right, the pressure of the A-material in the A-material storage cavity 214 rises, and after reaching the opening pressure of the check valve 215, the check valve 215 opens, and the A-material liquid flows into the mixing cavity 217 of the first material conveying pipe.

[0043] Figure 5 It is a schematic structural diagram of the second material conveying pipe 24. The check valve 241 has a certain opening pressure, is adhesively fixed to the pipe body 243 of the second material conveying pipe, and plays a role in positioning the pusher sliding ring 242 of the second material conveying pipe; the pusher sliding ring 242 of the second material conveying pipe fits with the pipe body 243 of the second material conveying pipe, is made of polytetrafluoroethylene material, has a small friction coefficient and a liquid sealing effect. When the B-material storage cavity 244 is filled with B-material liquid, the pusher sliding ring 242 of the second material conveying pipe is at the right end of the B-material storage cavity 244 and fits with the check valve 241; the B-material storage cavity 244 is filled with polyurethane B-material liquid; the check valve 245 is connected to the B-material storage cavity 244, is an outlet valve for the polyurethane B-material liquid, has a certain opening pressure, and its opening pressure is required to be greater than the pressure of the polyurethane B-material liquid in the non-working state. The outlet of the check valve 245 is in the direction of the mixing cavity 247 of the second material conveying pipe; the mixing cavity 247 of the second material conveying pipe is located at the left end of the second material conveying pipe 24 and is an annular space. The outlet 246 of the second material conveying pipe is on the large-diameter wall surface of the mixing cavity 247 of the second material conveying pipe, which is a circular outlet; during hole sealing, water with a certain pressure flows into the check valve 241, then pushes the pusher sliding ring 242 of the second material conveying pipe to move to the left, the pressure of the B-material in the B-material storage cavity 244 rises, and after reaching the opening pressure of the check valve 245, the check valve 245 opens, and the B-material liquid flows into the mixing cavity 247 of the second material conveying pipe.

[0044] Figure 6 It is a structural schematic diagram of the front plugging pipe 3. The front plugging pipe 3 includes a front plugging pipe body 31. A female thread is designed at the left end of the front plugging pipe body 31, which can be connected to the male thread at the right end of the material-carrying pipe 2. The second rubber sleeve 32 fits with the front plugging pipe body 31 and there is a gap between them. It will expand after being filled with water. The second water check valve 33 is fixed to the front plugging pipe body 31 by bonding. Water can enter the space formed by the front plugging pipe body 31 and the second rubber sleeve 32 from the pipeline, but cannot flow back. The pressure valve 34 is located at the right end of the front plugging pipe 3 and fits with the inner wall of the front plugging pipe 3. The right valve body 344 of the pressure valve 34 is bonded and fixed to the front plugging pipe body 31, and the left valve body 341 can slide left and right. When plugging the hole, water enters the front plugging pipe 3. Since the inner diameter of the channel on the valve body of the pressure valve 34 is much smaller than the inner diameter of the front plugging pipe 3, the pressure valve 34 will close, blocking the water injection channel of the entire hole plugging device. Water will enter the second water check valve 33, and the second rubber sleeve 32 will start to expand until it fits with the wall of the gas drainage borehole, completing the plugging at the front end of the hole plugging device.

[0045] Figure 7 It is a structural schematic diagram of the pressure valve 34. The pressure valve 34 is an eccentric valve, including a left valve body 341, a right valve body 344, a valve core 347, a valve core retaining ring 345, and a spring 343. The left valve body 341 is connected to the valve core 347 and they are integrated. The right end of the left valve body 341 is a conical surface and is provided with a left channel 342 as the channel for gas circulation. The spring 343 is nested on the valve core 347, located between the left valve body 341 and the right valve body 344, and fits with the left and right valve bodies. It has a certain compression amount in the non-working state. The valve core retaining ring 345 is bonded to the valve core 347 and fits with the right valve body 344, playing a role in preventing the valve core 347 from separating from the right valve body 344. The right valve body 344 is located at the right end of the pressure valve 34 and is bonded to the inner wall of the front plugging pipe 3 and is fixed. The left end face of the right valve body 344 is a conical surface, and a right channel 346 is opened on the right valve body 344, which is in an eccentric state with the left channel 342 of the left valve body 341 for gas circulation. When plugging the hole, water flows into the automatic hole plugging device. Since the inner diameter of the water injection channel is much larger than the inner diameter of the channel of the pressure valve 34, the pressure valve 34 will be closed. The conical surface of the left valve body 341 fits with the conical surface of the right valve body 344, and the left and right channels are not connected, blocking the water flow and increasing the pressure in the water injection channel. When gas is drained, the water injection stops, the pressure valve 34 automatically opens, the left and right valve bodies separate, the left and right channels are connected, and together with the water injection channel of the automatic hole plugging device, they form a gas drainage channel for gas drainage.

[0046] Working principle:

[0047] (1) The rear plugging pipe 1, the material-carrying pipe 2 and the front plugging pipe 3 are placed in the drill rod box of the automatic drill.

[0048] (2) The robotic arm of the automatic drill grabs the front plugging pipe 3 from the drill pipe box and sends it into the gripper by the active drill pipe;

[0049] (3) Grab the belt pipe 2, connect it to the front plugging pipe 3, and according to the requirement of the sealing hole length, grab several more belt pipes 2, connect them to the previous belt pipe 2, and send them into the drilling hole;

[0050] (4) Grab the rear plugging pipe 1, connect it to the belt pipe 2, and send it into the drilling hole. At this time, the active drill pipe is still connected to the rear plugging pipe;

[0051] (5) Water injection: Since the active drill pipe is connected to the water braid and has a hollow structure inside, water can be passed through during drilling to flush out the drill cuttings from the drilling hole. Utilizing this property, water is injected into the automatic sealing device. Since the channel inner diameter of the pressure valve 34 is much smaller than the inner diameter of the automatic sealing device, the pressure valve 34 will close and the water injection channel will be blocked. Continuing to inject water, the water pressure in the water injection channel rises, and the water flow starts to enter the second water check valve 33 of the front plugging pipe 3 and the first water check valve 13 of the rear plugging pipe 1. The second rubber sleeve 32 and the first rubber sleeve 12 start to fill with water and expand until they fully fit the hole wall of the gas drainage hole. At this time, limited by the expansion ratio, the rubber sleeves no longer expand. Continuing to inject water, the water pressure in the water injection channel continues to rise until it reaches the opening pressure of the first one-way valve 211 and the third one-way valve 241. The water flow enters the first one-way valve 211 and the third one-way valve 241, generating a thrust on the first belt pipe pusher ring 212 and the second belt pipe pusher ring 242. The thrust is transmitted to the A material storage cavity 214 and the B material storage cavity 244. The liquid pressure of polyurethane A material and B material starts to rise. After reaching the opening pressure of the second one-way valve 215 and the fourth one-way valve 245, the second one-way valve 215 and the fourth one-way valve 245 open. Polyurethane A material and B material flow into the mixing cavity 22 for mixing, and then flow through the discharge port 23 into the annular space formed by the automatic sealing device and the gas drainage drilling hole. After reacting for a period of time, it expands and fills the annular space. Stop water injection, withdraw the active drill pipe, and the hole sealing is completed.

[0052] (6) Gas drainage: After the water injection stops, under the elastic force of the spring 343, the pressure valve 34 automatically opens, and the left channel 342 and the right channel 346 of the eccentric valve are connected. The water injection channel of the automatic sealing device is transformed into a gas drainage channel. Install a drainage pipeline to conduct gas drainage.

[0053] The present invention is used for automatic hole sealing of gas drainage drilling holes in coal mines, solving the problems of low automation level, high labor intensity, and non-standard hole sealing of the existing bag-type hole sealing device; at the same time, it also solves the problems of discontinuous automatic lowering of the hole sealing device and automatic grouting process, easy triggering of gas accidents, and complex flow channels of the hole sealing device in the existing automatic hole sealing device.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A drill pipe type automatic hole sealing device, characterized in that: It includes a rear plugging pipe, at least one material-carrying pipe, and a front plugging pipe that are sequentially arranged and whose rear ends can all be detachably connected to the driving drill pipe of the drill rig; the adjacent ends of the rear plugging pipe, the material-carrying pipe, and the front plugging pipe can form a threaded connection, and the thread helix direction is the same as the rotation direction during the drilling of the drill rig; the rear plugging pipe, the material-carrying pipe, and the front plugging pipe all have central holes and are interconnected with each other to form a water injection channel; annular grooves are provided on the circumferences of the rear plugging pipe and the front plugging pipe, and water-filled and expandable rubber sleeves are provided in the two annular grooves to fit with the hole wall of the drill hole to form a hole-sealing area; water passing holes communicating the rubber sleeves and the water injection channel are provided on the rear plugging pipe and the front plugging pipe, and a water flow check valve is provided at the water passing holes; a pressure valve is provided at the front end of the front plugging pipe to automatically block the water injection channel under a certain water pressure; the material-carrying pipe has a first storage cavity, a mixing cavity, and a second storage cavity that are sequentially arranged along its axial direction; water inlets are provided at the other ends of the first storage cavity and the second storage cavity, and a first pressure check valve is provided at the water inlets to control the on-off of the water inlets. Pushing slide rings are provided in the first storage cavity and the second storage cavity to push the hole-sealing material in the corresponding storage cavity towards the mixing cavity under the action of water pressure; second pressure check valves are provided at both ends of the mixing cavity, and a discharge port is provided on the circumference to discharge the hole-sealing material entering the mixing cavity from the first storage cavity and the second storage cavity to the hole-sealing area. The first storage cavity and the second storage cavity are annular and have the same radial dimension, and the radial dimension of the mixing cavity is larger than that of the first storage cavity and the second storage cavity. The annular groove includes a first annular groove and a second annular groove that are sequentially arranged from the inside to the outside along the radial direction, and the length of the second annular groove is greater than that of the first annular groove to form a stepped shape with a smaller inner part and a larger outer part, and the rubber sleeve is installed in the second annular groove.

2. The automatic hole sealing device of a drill pipe type according to claim 1, wherein: The pressure valve is an eccentric valve that automatically closes under a certain water pressure, and includes a left valve body provided with a left channel, a right valve body provided with a right channel, a valve core fixedly connected to the left valve body, a spring sleeved on the valve core, the right valve body is fixedly connected to the front plugging pipe, the left valve body is slidably connected to the front plugging pipe, the other end of the valve core passes through the right valve body and is slidably connected to it, and a limiting member is also provided on the valve core to prevent the right valve body from separating from it. The opposite surfaces of the left valve body and the right valve body can be attached and the left channel and the right channel are not connected when they are attached, and the spring is located between the left valve body and the right valve body.

3. The automatic hole-sealing device of a drill pipe according to claim 2, characterized in that: The opposite surfaces of the left valve body and the right valve body are conical surfaces.

4. The automatic hole sealing device of drill pipe type according to claim 1, characterized in that: The material-carrying pipe includes a detachable first material-carrying pipe and a second material-carrying pipe. The first material-carrying pipe has a first storage cavity, the second material-carrying pipe has a second storage cavity, the connecting ends of the first material-carrying pipe and the second material-carrying pipe have an annular cavity that communicates with the corresponding storage cavity and whose radial dimension is larger than that of the corresponding storage cavity. Second pressure check valves are provided at the ends of the first storage cavity and the second storage cavity close to the annular cavity, and the two second pressure check valves and the annular cavity enclose the mixing cavity.

5. The automatic hole sealing device of drill pipe type according to claim 1, characterized in that: The rubber sleeve and the annular groove are adhesively connected.

6. The automatic hole sealing device of a drill pipe type according to claim 1, characterized in that: The drill pipe type automatic hole-sealing device is made of materials with flame retardant and antistatic properties.

7. The automatic hole sealing device of drill pipe type according to claim 1, characterized in that: The material of the rubber sleeve is natural rubber, and the material of the pushing slide ring is polytetrafluoroethylene.

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