A coal mine drilling pipeline centralizing device convenient to operate and fix

Abstract

The present application relates to the technical fields of drilling pipeline righting, in particular to a coal mine drilling pipeline righting device convenient to operate and fix, which comprises a first sleeve ring and a second sleeve ring, four fan-shaped push plates are telescopically installed at the centers of the first sleeve ring and the second sleeve ring, the four fan-shaped push plates are respectively movably abutted on the outer sides of sealing rings, and four pressing columns are respectively rotationally installed on the outer sides of the first sleeve ring and the second sleeve ring. The sealing rings are arranged to seal and protect the bottom end and the top end of the pipe section, prevent the threads at the connecting positions of the bottom end and the top end of the pipe section from being "rusty", and avoid the situation that the adjacent two drilling pipes cannot be opened due to the long construction period of drilling.

Description

Technical Field

[0001] This invention relates to the field of drilling pipeline straightening technology, specifically a coal mine drilling pipeline straightening device that is easy to operate and fix. Background Technology

[0002] Coal mines are areas where humans extract coal resources in coal-rich areas. When the coal seam is far from the surface, drilling equipment is generally used to excavate tunnels underground to extract coal. During the drilling process in coal mines, in order to ensure the verticality of the drill bit, pipeline straightening devices are often used to assist the drilling pipeline.

[0003] For example, patent application number 201721120673.6 discloses a high-efficiency anti-vibration drilling straightening device, which includes a straightening device body and a joint body fixed to the top of the straightening device body, as well as a buffer unit, a rolling unit and an anti-wear unit. It has the advantages of reducing the contact area between the straightening device and the inner wall of the drilling channel, reducing the wear area, and improving the service life of the straightening device.

[0004] However, existing coal mine drilling pipeline straightening devices still have certain defects in use. Current drilling technology often uses drill pipes and drill bits together for drilling, while also taking into account the recycling of drilling fluid. Therefore, drilling pipelines often use multiple drill pipes connected to each other to drill to the surface. Due to the presence of drilling fluid, during the drilling process, rock debris washed down by the drilling fluid often damages the anti-rust layer on the outer wall of the drill pipe connection, which easily leads to rust at the connection. The connection may even "rust shut" due to excessive construction time. Secondly, during construction, there is often the problem of loosening at the connection between drill pipes due to the threaded connection, which in turn leads to drilling tilt. Summary of the Invention

[0005] The purpose of this invention is to provide a coal mine drilling pipeline straightening device that is easy to operate and fix, so as to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A convenient and easy-to-operate coal mine drilling pipeline straightening device includes a first ring and a second ring. Four sector-shaped push plates are telescopically installed at the center of the first and second rings, and the four sector-shaped push plates are movably abutting against the outside of the sealing ring. Four clamping columns are rotatably installed on the outside of the first and second rings respectively. Sector-shaped clamping plates for limiting and fixing the pipeline end are slidably installed on the inside of the first and second rings. Four rectangular columns are provided at the center of the first and second rings, and the rectangular columns are connected to the sector-shaped push plates and sector-shaped clamping plates.

[0008] Preferably, the first and second rings are mirror images of the sealing ring. Both ends of the rectangular column are fixedly connected to trapezoidal push blocks. The end of the trapezoidal push block away from the rectangular column is fixedly connected to a top plate. The first and second rings each have four rectangular holes in the vertical direction. The trapezoidal push block and the rectangular column are slidably sleeved on the side of the rectangular hole away from the fan-shaped plate. The trapezoidal push block and the fan-shaped plate are connected in a transmission manner. The four rectangular holes and the four rectangular columns are equidistant from the sealing ring.

[0009] Preferably, the first and second rings are provided with slots on the side wall panels that are far apart from each other. The slots are adapted to the top plate and a limit post is provided in the slot. A rubber strip is fixedly connected to the center of the side of the top plate near the fan-shaped card plate. The rubber strip is movably engaged with the limit post.

[0010] Preferably, a storage groove is provided at the center of the inner side of both the first and second rings. Four fan-shaped plates are movably stored in the storage groove. A horizontal sliding plate is fixedly connected to the center of the end of the fan-shaped plate near the storage groove. A trapezoidal slider is fixedly connected to the end of the horizontal sliding plate away from the fan-shaped plate. The inclined surface of the trapezoidal slider is movably abutting against the inclined surface of the trapezoidal push block. Four horizontal sliding plates are slidably connected to both the first and second rings. The horizontal sliding plates pass through the side wall of the storage groove away from the fan-shaped plate and extend into the rectangular hole. The trapezoidal slider is slidably connected in the rectangular hole.

[0011] Preferably, a fixed end of a telescopic rod is embedded at the center of the side of the rectangular column near the sealing ring. A fixed block is fixedly connected to the telescopic end of the telescopic rod. A fixed rod is fixedly sleeved at the center of the fixed block. The end of the fixed block away from the telescopic rod is fixedly connected to a fan-shaped push plate. The fan-shaped push plate movably abuts against the outer wall plate of the sealing ring through the telescopic rod.

[0012] Preferably, a first rotating rod is rotatably connected above both ends of the fixed rod, and a second rotating rod is rotatably connected below both ends of the fixed rod. The two second rotating rods are located on the opposite side of the two first rotating rods. The ends of the two first rotating rods away from the fixed rod are rotatably connected to the first collar, and the ends of the two second rotating rods away from the fixed rod are rotatably connected to the second collar.

[0013] Preferably, the first collar has mounting grooves on both sides of the rectangular hole, and a rotating shaft is fixedly connected in the horizontal direction in the mounting groove of the first collar. The end of the first rotating rod away from the fixed rod is rotatably sleeved on the rotating shaft. The second collar also has mounting grooves on both sides of the rectangular hole, and a rotating rod is fixedly connected in the horizontal direction in the mounting groove of the second collar. The end of the second rotating rod away from the fixed rod is rotatably sleeved on the rotating rod.

[0014] Preferably, the first and second rings are each provided with four sliding grooves. The sliding grooves are located at the center between two adjacent rectangular holes. A rubber pad is fixedly connected to one end of the sliding groove near the receiving groove. A rectangular sliding plate is slidably fitted inside the sliding groove. A rectangular sliding column is fixedly connected to the side of the rectangular sliding plate away from the rubber pad. The rectangular sliding column passes through the wall panel on the side of the sliding groove away from the receiving groove and is slidably fitted inside the wall panel on that side. The four sliding grooves and the four rectangular holes are distributed in an octagonal shape.

[0015] Preferably, the end of the rectangular sliding column away from the rectangular sliding plate is rotatably sleeved with a rotating rod in the vertical direction. Both ends of the rotating rod are fixedly connected with clamping columns. The end of the rectangular sliding column near the rectangular sliding plate is sleeved with a spring. One end of the spring is fixedly connected to the side wall of the sliding groove away from the rubber pad, and the other end is fixedly connected to the side wall of the rectangular sliding plate near the rectangular sliding column. The ends of the two clamping columns fixedly connected on the same rotating rod that are far apart from each other are provided with a tapered end face.

[0016] Preferably, the four fan-shaped clamping plates on the first sleeve are respectively clamped to the side of the bottom end of the pipe section, the four fan-shaped clamping plates on the second sleeve are respectively clamped to the side of the top end of the pipe section, the sealing ring is sleeved at the connection between the top end and the bottom end of the pipe section, the top end of the pipe section is provided with a threaded groove, the bottom end of the pipe section is provided with a threaded ring, the threaded ring is threadedly sleeved in the threaded groove, and a hollow layer is provided at the center of the sealing ring.

[0017] The beneficial effects of this invention are:

[0018] 1. This invention utilizes a sealing ring to seal and protect the bottom and top ends of the pipe section, preventing the threads at the connection point from "rusting shut." This avoids the situation where adjacent drill pipes cannot be opened due to "rusting shut" during long drilling operations. The fan-shaped push plate also enhances the sealing effect of the sealing ring, isolating the outside of the connection point between the bottom and top ends of the pipe section from the outside environment, further preventing the threads at the connection point from "rusting shut."

[0019] 2. This invention, through the setting of the fan-shaped clamping plate, effectively fixes the top and bottom ends of the pipe segment, thereby further suppressing loosening at the connection between the top and bottom ends of the pipe segment and promoting reinforcement between them. The fan-shaped push plate also plays a further promoting role, increasing the friction between the sealing ring and the connection between the top and bottom ends of the pipe segment, thus suppressing loosening at the connection between the top and bottom ends of the pipe segment, ensuring the verticality of the drill pipe, effectively reinforcing the connection between the drill pipes, and preventing tilting at the connection between the drill pipes.

[0020] 3. The invention, through the setting of the first and second sets of rings, can also play a certain role in limiting "backflow". In the initial stage of "backflow", the stabilizing effect of the first and second sets of rings on the drilling fluid will be abnormal, making it easier for technicians to observe "backflow". When "backflow" occurs, it is buffered by multiple sets of first and second sets of rings, so the effect on the ground will be relatively small. Furthermore, the buffering effect of the first and second sets of rings can effectively delay the outbreak of "backflow", thereby giving technicians on the ground some time to escape or deal with "backflow", reducing the losses and damage caused by "backflow" accidents.

[0021] 4. The invention, through the design of the slots and top plate, effectively facilitates the stacking of the device and also saves space. The clamping column, during rotation, abuts against the sidewall of the well, generating pressure. This pressure, applied by the clamping column as the drill pipe rotates and rolls, creates a "road roller" effect, reinforcing the inner wall of the well and preventing collapse during drilling. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram illustrating the effect of using the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of the present invention after the pipeline is removed;

[0025] Figure 3 This is a cross-sectional view of the rectangular column structure of the present invention;

[0026] Figure 4 This is the present invention. Figure 3 The diagram shown is an enlarged view of the structure of part A.

[0027] Figure 5 This is the present invention. Figure 3 The diagram shown is an enlarged view of the structure of section B.

[0028] Figure 6 This is a cross-sectional view of the clamping column of the present invention;

[0029] Figure 7 This is the present invention. Figure 6 The diagram shown is an enlarged view of the C-section structure.

[0030] Figure 8 This is a cross-sectional view of the structure of the sector-shaped card plate of the present invention;

[0031] Figure 9 This is the present invention. Figure 8 The diagram shown is an enlarged view of the structure of part D.

[0032] Figure 10 This is a bottom view of the overall structure of the invention;

[0033] Figure 11 This is the present invention. Figure 10 The diagram shown is an enlarged view of the structure of part E.

[0034] Figure 12 This is a cross-sectional view of the installation structure of the present invention;

[0035] Figure 13 This is a schematic diagram of the installation structure of the rectangular column of the present invention;

[0036] Figure 14 This is a cross-sectional schematic diagram of the mounting structure of the rotating shaft of the present invention;

[0037] Figure 15 This is a top view of the overall structure of the present invention after the pipeline is removed;

[0038] The reference numerals in the attached drawings are as follows: 1. First ring; 2. Second ring; 3. Rectangular column; 4. Pressing column; 5. Sealing ring; 6. Fan-shaped clamping plate; 7. Rotating rod; 8. Fan-shaped push plate; 9. First rotating rod; 10. Second rotating rod; 11. Horizontal sliding plate; 12. Trapezoidal slider; 13. Trapezoidal push block; 14. Top plate; 15. Telescopic rod; 16. Fixed rod; 17. Storage groove; 18. Rectangular sliding column; 19. Spring; 20. Slide groove; 21. Rectangular sliding plate; 22. Rubber pad; 23. Mounting groove; 24. Fixed block; 25. Rotating shaft; 26. Slot; 27. Bottom end of pipe section; 28. Top end of pipe section; 29. ​​Threaded ring; 30. Rubber clamping strip; 31. Hollow layer. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] like Figure 1-15As shown, a convenient and easy-to-operate coal mine drilling pipeline straightening device includes a first ring 1 and a second ring 2. Four sector-shaped push plates 8 are telescopically installed at the center of the first ring 1 and the second ring 2, and the four sector-shaped push plates 8 movably abut against the outside of a sealing ring 5. Four clamping columns 4 are rotatably installed on the outside of both the first ring 1 and the second ring 2. Sliding sector-shaped clamping plates 6 for limiting and fixing the pipeline ends are installed on the inside of both the first ring 1 and the second ring 2. Four rectangular columns 3 are set at the center of the first ring 1 and the second ring 2, and the rectangular columns 3 are connected to the sector-shaped push plates 8 and the sector-shaped clamping plates 6. When the device is not in use, if it is stacked horizontally, the clamping columns 4 can also provide support after stacking, preventing the device from rolling on the ground. During this process, the rubber pads 22 can also cushion the clamping columns 4.

[0041] As a technical optimization of the present invention, the first ring 1 and the second ring 2 are mirror images of the sealing ring 5. Trapezoidal push blocks 13 are fixedly connected to both ends of the rectangular column 3. A top plate 14 is fixedly connected to the end of the trapezoidal push block 13 away from the rectangular column 3. Four rectangular holes are vertically formed on both the first ring 1 and the second ring 2. The trapezoidal push block 13 is slidably fitted onto the side of the rectangular hole away from the fan-shaped clamping plate 6, and the trapezoidal push block 13 is drively connected to the fan-shaped clamping plate 6. The four rectangular holes and the four rectangular columns 3 are equidistantly distributed with respect to the sealing ring 5. The rectangular column 3 is slidably fitted into the rectangular hole. The arrangement of the rectangular column 3 effectively provides support for the telescopic rod 15 and also ensures the relative position between the first ring 1 and the second ring 2.

[0042] As a technical optimization of the present invention, slots 26 are provided on the side wall panels of the first ring 1 and the second ring 2 that are far apart from each other. The slots 26 are adapted to the top plate 14. Limiting posts are provided in the slots 26. A rubber strip 30 is fixedly connected to the center of the side of the top plate 14 near the fan-shaped card plate 6. The rubber strip 30 is movably engaged with the limiting post. Both the rubber strip 30 and the limiting post are made of rubber and have a certain degree of elasticity, which allows the top plate 14 to be engaged or disengaged from the slots 26.

[0043] As a technical optimization of the present invention, a storage groove 17 is provided at the inner center of both the first ring 1 and the second ring 2. Four fan-shaped plates 6 are movably stored in the storage groove 17. A horizontal sliding plate 11 is fixedly connected to the center of the end of the fan-shaped plate 6 near the storage groove 17. A trapezoidal slider 12 is fixedly connected to the end of the horizontal sliding plate 11 away from the fan-shaped plate 6. The inclined surface of the trapezoidal slider 12 movably abuts against the inclined surface of the trapezoidal push block 13. Four horizontal sliding plates 11 are slidably connected to both the first ring 1 and the second ring 2. The horizontal sliding plates 11 penetrate the side wall of the storage groove 17 away from the fan-shaped plate 6 and extend into the rectangular hole. The trapezoidal slider 12 is slidably connected in the rectangular hole. The contact surfaces of the trapezoidal slider 12 and the trapezoidal push block 13 are both smooth contact surfaces.

[0044] As a technical optimization of the present invention, a fixed end of a telescopic rod 15 is embedded in the center of the rectangular column 3 near the sealing ring 5. A fixing block 24 is fixedly connected to the telescopic end of the telescopic rod 15. A fixing rod 16 is fixedly sleeved at the center of the fixing block 24. The end of the fixing block 24 away from the telescopic rod 15 is fixedly connected to a fan-shaped push plate 8. The fan-shaped push plate 8 movably abuts against the outer wall of the sealing ring 5 through the telescopic rod 15. The telescopic rod 15 is a hydraulic telescopic structure similar to a "hydraulic jack", which can effectively apply a pushing force to the fixing block 24, and at the same time enable the fan-shaped clamping plate 6 to effectively abut against the outer wall of the pipe section, thereby effectively fixing the device.

[0045] As a technical optimization of the present invention, a first rotating rod 9 is rotatably connected to the upper ends of the fixed rod 16, and a second rotating rod 10 is rotatably connected to the lower ends of the fixed rod 16. The two second rotating rods 10 are located on opposite sides of the two first rotating rods 9. The ends of the two first rotating rods 9 away from the fixed rod 16 are rotatably connected to the first collar 1, and the ends of the two second rotating rods 10 away from the fixed rod 16 are rotatably connected to the second collar 2. One end of the first rotating rod 9 is rotatably connected to the bottom of the first collar 1, and the other end of the first rotating rod 9 is rotatably sleeved on the fixed rod 16. One end of the second rotating rod 10 is rotatably connected to the top of the second collar 2, and the other end is rotatably sleeved on the fixed rod 16.

[0046] As a technical optimization of the present invention, mounting grooves 23 are provided on both sides of the rectangular hole on the first collar 1. A rotating shaft 25 is fixedly connected horizontally in the mounting groove 23 of the first collar 1. The end of the first rotating rod 9 away from the fixed rod 16 is rotatably sleeved on the rotating shaft 25. Mounting grooves 23 are also provided on both sides of the rectangular hole on the second collar 2. A rotating rod is fixedly connected horizontally in the mounting groove 23 of the second collar 2. The end of the second rotating rod 10 away from the fixed rod 16 is rotatably sleeved on the rotating rod. The mounting grooves 23 effectively enable the first rotating rod 9 and the second rotating rod 10 to rotate, thereby enabling the first collar 1 and the second collar 2 to move effectively toward each other.

[0047] As a technical optimization of the present invention, the first ring 1 and the second ring 2 are each provided with four sliding grooves 20. The sliding grooves 20 are located at the center between two adjacent rectangular holes. A rubber pad 22 is fixedly connected to one end of the sliding groove 20 near the receiving groove 17. A rectangular sliding plate 21 is slidably fitted inside the sliding groove 20. A rectangular sliding post 18 is fixedly connected to the side of the rectangular sliding plate 21 away from the rubber pad 22. The rectangular sliding post 18 passes through the wall panel of the sliding groove 20 away from the receiving groove 17 and is slidably fitted inside the wall panel. The four sliding grooves 20 and the four rectangular holes are distributed in an octagonal pattern. The four sliding grooves 20 and the four rectangular holes are equidistantly distributed, and the sliding grooves 20 are staggered between the rectangular holes.

[0048] As a technical optimization of the present invention, a rotating rod 7 is rotatably connected to the end of the rectangular sliding column 18 away from the rectangular sliding plate 21 in the vertical direction. Both ends of the rotating rod 7 are fixedly connected to clamping columns 4. A spring 19 is sleeved on the end of the rectangular sliding column 18 near the rectangular sliding plate 21. One end of the spring 19 is fixedly connected to the side wall of the sliding groove 20 away from the rubber pad 22, and the other end is fixedly connected to the side wall of the rectangular sliding plate 21 near the rectangular sliding column 18. The two clamping columns 4 fixedly connected to the same rotating rod 7 each have a tapered end face at their ends. The tapered end faces on the clamping columns 4 effectively prevent soil from being scraped off the inner wall of the well, thereby ensuring the reinforcing and compacting effect of the clamping columns 4 on the inner wall of the well.

[0049] As a technical optimization of the present invention, four sector-shaped clamping plates 6 provided on the first ring 1 are respectively clamped to the side of the bottom end 27 of the pipe section, and four sector-shaped clamping plates 6 provided on the second ring 2 are respectively clamped to the side of the top end 28 of the pipe section. A sealing ring 5 is sleeved at the connection between the top end 28 and the bottom end 27 of the pipe section. The top end 28 of the pipe section is provided with a threaded groove, and the bottom end 27 of the pipe section is provided with a threaded ring 29, which is threadedly sleeved in the threaded groove. A hollow layer 31 is provided at the center of the sealing ring 5. The bottom end 27 of the pipe section is the bottom end of the drill pipe, and the top end 28 of the pipe section is the top end of the drill pipe.

[0050] Before coal mine drilling or mining, it is often necessary to drill a well on the surface using drill bits. During the drilling process, drilling equipment is used to gradually drill a well on the surface through the connection of multiple drill pipes. After one drill pipe enters the ground, another drill pipe needs to be added to continue drilling. During the drilling process, drilling fluid is often added to mix the soil drilled down by the drill bit into mud, and the mud is transported to the surface through backwashing. This technology is existing and will not be elaborated on here. To ensure the verticality of the drilling, a centering device is often used to keep the drill pipes vertical. To ensure the discharge of mud, drill pipes are often installed in a pipeline configuration. In existing technology, drill pipes and drill tubing are often manufactured as a single unit. Therefore, during the drilling process, drill pipes and drill tubing usually refer to "hollow drill pipes" used in drilling. The difference is that drill pipes are often thinner hollow rods used during drilling, while drill tubing is often thicker hollow rods used during drilling. This technology is common knowledge in the field and will not be disclosed further here.

[0051] In use, when adding more drill pipe after one drill pipe has been drilled into the well, a sealing ring 5 is fitted onto the top 28 of the pipe section in the well. Then, a second ring 2 is fitted onto the end of the top 28 of the pipe section. After the second ring 2 is fitted onto the top 28 of the pipe section, the bottom 27 of another drill pipe section is fitted into the first ring 1. The bottom 27 of the pipe section is screwed onto the top 28 of the pipe section through a threaded ring 29 and a threaded groove. At this time, the sealing ring 5 is located outside the connection between the bottom 27 and the top 28 of the pipe section. The sealing ring 5 seals the bottom 27 and the top 28 of the pipe section, preventing the threads at the connection between the bottom 27 and the top 28 of the pipe section from "rusting shut". This avoids the situation where adjacent drill pipes cannot be opened due to "rusting shut" because of the long drilling period. The inner wall of the connection between the bottom end 27 and the top end 28 of the pipe section is often rust-free because it is constantly immersed in drilling fluid. Since the drilling fluid does not contain sediment or debris that could damage the surface rust-preventive coating, it typically does not rust. However, the outer side of the pipe connection often experiences rust damage due to the presence of rock debris drilled down by the drill bit in the drilling fluid, leading to rust formation on the outer side of the connection. The sealing ring 5 effectively mitigates this issue.

[0052] After threading the bottom end 27 and top end 28 of the pipe section together, the telescopic rod 15 is extended. This extension causes the fixing block 24 to move closer to the sealing ring 5. The fixing block 24 then pushes the sector-shaped push plate 8 closer to the sealing ring 5. As the sector-shaped push plate 8 moves, it applies pressure to the sealing ring 5, increasing the air pressure in the hollow layer 31 within the sealing ring 5. This causes the sealing ring 5 to expand, resulting in a tighter fit between the sealing ring 5 and the connection between the bottom end 27 and top end 28 of the pipe section. This further strengthens the connection between the sealing ring 5 and the bottom end 27 and top end 28 of the pipe section. The tighter connection further enhances the sealing effect of the sealing ring 5, isolating the outside of the connection between the bottom end 27 and the top end 28 of the pipe section from the outside world. This further prevents the threads at the connection between the bottom end 27 and the top end 28 of the pipe section from "rusting and seizing". At the same time, the pressure applied to the sealing ring 5 by the fan-shaped push plate 8 also allows the sealing ring 5 to apply a certain pressure to the connection between the bottom end 27 and the top end 28 of the pipe section, increasing the friction between the sealing ring 5 and the connection between the bottom end 27 and the top end 28 of the pipe section. This, in turn, helps to suppress the loosening of the connection between the bottom end 27 and the top end 28 of the pipe section.

[0053] The movement of the fixed block 24 toward the sealing ring 5 will also cause the fixed rod 16 to move. The movement of the fixed rod 16 will cause the first rotating rod 9 and the second rotating rod 10 to move. This will cause the ends of the first rotating rod 9 and the second rotating rod 10 connected to the fixed rod 16 to move toward the sealing ring 5. Consequently, the first rotating rod 9 and the second rotating rod 10 will respectively drive the first collar 1 and the second collar 2 to move toward the sealing ring 5. Since the included angle between the first rotating rod 9 and the second rotating rod 10 changes from large to small, the ends of the first rotating rod 9 and the second rotating rod 10 that are far apart will inevitably move closer to each other. This will cause the first collar 1 and the second collar 2 to move toward each other.

[0054] When the first ring 1 and the second ring 2 move toward each other, the trapezoidal push block 13 on the rectangular column 3 will contact the trapezoidal slider 12 and slide relative to each other. This causes the trapezoidal slider 12 to be subjected to a force toward the fan-shaped clamping plate 6. Consequently, the trapezoidal slider 12 pushes the fan-shaped clamping plate 6 through the transverse sliding plate 11, causing the four fan-shaped clamping plates 6 to converge toward the center. This results in the four fan-shaped clamping plates 6 on the first ring 1 engaging with the side of the bottom end 27 of the pipe section, and the four fan-shaped clamping plates 6 on the second ring 2 engaging with the side of the top end 28 of the pipe section. The fan-shaped clamping plates 6 effectively fix the top end 28 and the bottom end 27 of the pipe section, further suppressing the loosening of the connection between the bottom end 27 and the top end 28 of the pipe section, and promoting the reinforcement between the top end 28 and the bottom end 27 of the pipe section.

[0055] After the device is installed, during drilling, the drill pipe rotates, which in turn causes the first set of rings 1 and 2 to rotate, thereby causing the clamping column 4 to rotate. During the rotation of the clamping column 4, the centrifugal force generated by the rotation causes the rectangular sliding column 18 to move away from the rectangular sliding plate 21. At this time, the rectangular sliding plate 21 compresses the spring 19, causing the spring 19 to contract. As the clamping column 4 rotates, it comes into contact with the sidewall of the well, thus exerting pressure on the sidewall. This allows the clamping column 4 to apply pressure to the well wall as the drill bit rotates and rolls, similar to the effect of a "road roller," thereby reinforcing the inner wall of the well and preventing collapse during drilling. The spring 19 is designed to effectively buffer the contact between the clamping column 4 and the relatively hard "protrusion" on the inner wall of the well. The "protrusion" is a hard rock that has not been drilled down by the drill bit, which is very common in well drilling operations and will not be discussed in detail here.

[0056] During the drilling process, when the drilling fluid is recovered, it will pass through the gap between the first and second rings 1 and the drilling sidewall. The clamping column 4 effectively ensures that there is a gap between the first and second rings 1 and the drilling inner wall to allow the drilling fluid to pass through and prevent the drilling fluid from being unable to be discharged. In addition, the fan-shaped baffle 6 set on the second ring 2 below can also protect the sealing ring 5 and effectively block hard debris in the drilling fluid to prevent the debris from scratching the sealing ring 5. The first set of rings 1 and 2 effectively stabilize the flow of drilling fluid. The first and second sets of rings 1 and 2 at multiple drill pipe connections act as buffers, maintaining the drilling fluid discharge rate and facilitating observation of the drilling process by technicians on the surface. If the underground gas pressure is higher than the outside gas pressure during drilling, the pressure imbalance at the moment of connection can easily cause backflow of drilling fluid and other substances at the bottom of the well. The first and second sets of rings 1 and 2 also help to mitigate this backflow. To a certain extent, the first and second rings will have an abnormal effect on the flow stabilization of drilling fluid in the initial stage of "backflow," making it easier for technicians to observe the "backflow." When "backflow" occurs, it is buffered by multiple first and second rings, so its impact on the surface is relatively small. Furthermore, the buffering effect of the first and second rings can effectively delay the outbreak of "backflow," thus giving technicians on the surface some time to escape or deal with the "backflow," reducing the losses and damage caused by the "backflow" accident.

[0057] When the device is not in use, the sealing ring 5 is removed. The extension of the telescopic rod 15 causes the first ring 1 and the second ring 2 to come closer together. When the telescopic rod 15 extends to the point where the four fan-shaped push plates 8 converge into a ring, the telescopic rod 15 stops extending. At this time, the clamping post 4 at the top of the second ring 2 will abut against the clamping post 4 at the bottom of the first ring 1. The sealing ring 5 is placed at the top center of the first ring 1. Then, the four top plates 14 on the top of the first ring 1 of the device are inserted into the four slots 26 at the bottom of the second ring 2 of the device. At this time, the four top plates 14 on the bottom of the second ring 2 of the device will be inserted into the corresponding slots 26 on the top of the first ring 1. The slots 26 and the top plates 14 effectively facilitate the stacking of the device and also save space.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A coal mine drilling pipe centralizing device which is convenient to operate and fix, comprising a first sleeve ring (1) and a second sleeve ring (2), characterized in that, The first ring (1) and the second ring (2) are provided with four fan-shaped push plates (8) at the center and are movably connected to the outside of the sealing ring (5), the first ring (1) and the second ring (2) are provided with four pressing columns (4) on the outside and are rotatably connected, the first ring (1) and the second ring (2) are provided with fan-shaped clamping plates (6) on the inside and are slidably connected, the first ring (1) and the second ring (2) are provided with four rectangular columns (3) at the center and are drivingly connected with the fan-shaped push plates (8) and the fan-shaped clamping plates (6). The first ring (1) and the second ring (2) are mirror images about the sealing ring (5), the two ends of the rectangular column (3) are fixedly connected with trapezoidal push blocks (13), the end of the trapezoidal push block (13) away from the rectangular column (3) is fixedly connected with a top plate (14), the first ring (1) and the second ring (2) are provided with four rectangular holes in the vertical direction, the trapezoidal push block (13) and the rectangular column (3) are slidably connected on the side of the rectangular hole away from the fan-shaped clamping plate (6), and the trapezoidal push block (13) is drivingly connected with the fan-shaped clamping plate (6). When the first ring (1) and the second ring (2) move towards each other, the trapezoidal push block (13) on the rectangular column (3) is in contact with the trapezoidal sliding block (12) and slides relatively, so that the trapezoidal sliding block (12) is subjected to a force towards the fan-shaped clamping plate (6), and the four fan-shaped clamping plates (6) are gathered towards the center. The side of the rectangular column (3) close to the sealing ring (5) is embedded with a fixed end of an extension rod (15) at the center, the extension end of the extension rod (15) is fixedly connected with a fixed block (24), the center of the fixed block (24) is fixedly connected with a fixed rod (16), the end of the fixed block (24) away from the extension rod (15) is fixedly connected with the fan-shaped push plate (8), and the fan-shaped push plate (8) is movably connected with the outer side wall of the sealing ring (5) through the extension rod (15). The two ends of the fixed rod (16) are rotatably connected with first rotating rods (9) above, the two ends of the fixed rod (16) are rotatably connected with second rotating rods (10) below, the two second rotating rods (10) are located on the opposite side of the two first rotating rods (9), and the ends of the two first rotating rods (9) away from the fixed rod (16) are rotatably connected with the first ring (1) and the second ring (2) respectively.

2. The coal mine drilling pipe centralizing device of claim 1, wherein, The four rectangular holes and the four rectangular columns (3) are equidistantly distributed about the sealing ring (5).

3. The coal mine drilling pipe centralizing device of claim 2, wherein, The side wall of the first ring (1) and the second ring (2) away from each other is provided with a clamping groove (26), the clamping groove (26) is matched with the top plate (14), a limiting column is arranged in the clamping groove (26), a rubber clamping strip (30) is fixedly connected to the center of the side of the top plate (14) close to the fan-shaped clamping plate (6), and the rubber clamping strip (30) is movably connected with the limiting column.

4. The coal mine drilling pipe centralizing device of claim 2, wherein, The inner side center of the first ring (1) and the second ring (2) is provided with a receiving groove (17), four fan-shaped clamping plates (6) are movably received in the receiving groove (17), the end center of the fan-shaped clamping plate (6) close to the receiving groove (17) is fixedly connected with a transverse sliding plate (11), the end of the transverse sliding plate (11) away from the fan-shaped clamping plate (6) is fixedly connected with a trapezoidal sliding block (12), the inclined surface of the trapezoidal sliding block (12) movably abuts against the inclined surface of a trapezoidal push block (13), four transverse sliding plates (11) are slidably connected to the first ring (1) and the second ring (2), the transverse sliding plate (11) penetrates through the side wall plate of the receiving groove (17) away from the fan-shaped clamping plate (6) and extends into the rectangular hole, and the trapezoidal sliding block (12) is slidably connected in the rectangular hole.

5. The coal mine drilling pipe centralizing device of claim 2, wherein, The first ring (1) is provided with a mounting groove (23) on both sides of the rectangular hole, a rotating shaft (25) is fixedly connected in the mounting groove (23) of the first ring (1) in the horizontal direction, the end of the first rotating rod (9) away from the fixed rod (16) is rotatably sleeved on the rotating shaft (25), and the second ring (2) is also provided with a mounting groove (23) on both sides of the rectangular hole. A rotating rod is fixedly connected in the mounting groove (23) of the second ring (2) in the horizontal direction, and the end of the second rotating rod (10) away from the fixed rod (16) is rotatably sleeved on the rotating rod.

6. A coal mine drilling pipe centralizing device convenient to operate and fix according to claim 4, characterized in that, The first ring (1) and the second ring (2) are each provided with four sliding grooves (20), the sliding grooves (20) are arranged at the centers between adjacent two rectangular holes, the end of the sliding groove (20) close to the receiving groove (17) is fixedly connected with a rubber pad (22), a rectangular sliding plate (21) is slidably sleeved in the sliding groove (20), the side of the rectangular sliding plate (21) away from the rubber pad (22) is fixedly connected with a rectangular slide column (18), the rectangular slide column (18) penetrates through the wall plate on the side of the sliding groove (20) away from the receiving groove (17) and is slidably sleeved in the wall plate, and the four sliding grooves (20) and the four rectangular holes are distributed in a regular octagon.

7. A coal mine drilling pipe centralizing device convenient to operate and fix according to claim 6, characterized in that, The end of the rectangular slide column (18) away from the rectangular sliding plate (21) is rotatably sleeved with a rotating rod (7) in the vertical direction, the two ends of the rotating rod (7) are fixedly connected with pressing columns (4), the end of the rectangular slide column (18) close to the rectangular sliding plate (21) is sleeved with a spring (19), one end of the spring (19) is fixedly connected to the wall plate on the side of the sliding groove (20) away from the rubber pad (22), the other end is fixedly connected to the wall plate on the side of the rectangular sliding plate (21) close to the rectangular slide column (18), and the ends of the two pressing columns (4) away from each other on the same rotating rod (7) are provided with a tapered end face.

8. The coal mine drilling pipe centralizing device of claim 4, wherein, Four fan-shaped clamping plates (6) arranged on the first ring (1) are clamped on the side edges of the bottom end (27) of the pipe section, four fan-shaped clamping plates (6) arranged on the second ring (2) are clamped on the side edges of the top end (28) of the pipe section, the sealing ring (5) is sleeved on the connection between the top end (28) and the bottom end (27) of the pipe section, the top end (28) is provided with a threaded groove, the bottom end (27) is provided with a threaded ring (29), the threaded ring (29) is threadedly sleeved in the threaded groove, and the center of the sealing ring (5) is provided with a hollow layer (31).

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