Combined large-diameter raise drill rod

Abstract

The utility model discloses a combined type large-diameter raise drill rod, which relates to the technical field of raise drills and comprises a tubular screwed joint, a tubular drill rod and a return joint, and the tubular screwed joint is in interference connection with the tubular drill rod through a taper thread pair; the aligning connector is in interference fit with the tubular drill rod through a taper thread pair, and the aligning connector is connected with a stabilizing device used for pushing the tubular drill rod to automatically return to the center of a drill hole. The tubular drill rod and the aligning connector are assembled in advance, the tubular drill rod and the aligning connector can be installed together in the drilling process, and the drilling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of raise drilling machines, in particular to a combined large-diameter raise drilling rod. Background Art

[0002] The patio is an important shaft and tunnel project in the mine, and its engineering volume accounts for about 40-50% of the mining and cutting engineering volume, while the blind patio project accounts for about 10-20% of the patio engineering volume. For a long time, the traditional blind patio construction method has been mostly ordinary chiseling and blasting, which has slow excavation speed, low efficiency, high wood consumption, poor ventilation, high labor intensity, poor working conditions, and many safety accidents. The patio drilling rig has the characteristics of large drilling depth, adjustable drilling diameter and angle, and easy installation. Drilling the patio with a patio drilling rig can not only improve production efficiency, but also save a lot of wood and funds for the mine. It is a safe and reliable patio construction method. When the diameter of the drill rod is large, the combined drill rod can save manufacturing costs compared to the one-piece drill rod. The drill rod may be offset during work, so a radial positioning device is required. Usually, after installing several sections of ordinary drill rods, a radial positioning device needs to be installed separately. In the prior art, there is a problem that the radial positioning device of the drill rod is inconvenient to install. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a combined large-diameter riser drill pipe, in which a tubular drill pipe and a return joint are preassembled, and the tubular drill pipe and the return joint can be installed together during the drilling process, thereby improving the drilling efficiency.

[0004] According to the first aspect of the utility model, a combined large-diameter skydrill pipe comprises: a tubular threaded joint, a tubular drill pipe, and a return joint, wherein the tubular threaded joint and the tubular drill pipe are interference-connected via a tapered thread pair; the return joint and the tubular drill pipe are interference-connected via a tapered thread pair, and the return joint is connected to a stabilizing device for pushing the tubular drill pipe to automatically return to the center of the borehole.

[0005] A combined large-diameter skylight drill rod according to an embodiment of the utility model has at least the following beneficial effects: the tubular drill rod and the return joint are pre-assembled, and the tubular drill rod and the return joint can be installed together during the drilling process, thereby improving the drilling efficiency; since there is a requirement for the installation distance between adjacent return joints, a return joint is installed every few tubular drill rods; when the return joint is not needed, a tubular threaded joint is used to connect adjacent tubular drill rods.

[0006] According to some embodiments of the utility model, two tubular drill rods and one tubular threaded joint are arranged between two adjacent return joints.

[0007] According to some embodiments of the utility model, the tubular drill pipe, the tubular threaded joint and the return joint are respectively provided with a first center hole, a second center hole and a third center hole for water to flow through at the center.

[0008] According to some embodiments of the utility model, the stabilizing device includes a stabilizing column and a ball bearing, the outer side wall of the return joint is provided with a guide hole extending radially along the return joint, the stabilizing column partially extends into the guide hole and can slide along the guide hole, the ball bearing is rotatably installed on one end of the stabilizing column away from the return joint, and the guide hole is connected to the third center hole through a throttling hole.

[0009] According to some embodiments of the present utility model, a one-way valve is further provided between the guide hole and the third center hole, and water in the third center hole can enter the guide hole through the one-way valve.

[0010] According to some embodiments of the utility model, a limiting ring is provided at one end of the stabilizing column extending into the guide hole, the diameter of the limiting ring is larger than the diameter of the stabilizing column, a limiting cylinder is threadedly connected in the guide hole, the stabilizing column passes through the limiting cylinder, and the limiting cylinder cooperates with the limiting ring to prevent the stabilizing column from detaching from the guide hole.

[0011] According to some embodiments of the utility model, a surfacing wear-resistant belt is provided on the tubular drill pipe.

[0012] According to some embodiments of the present utility model, a first clamping groove is provided on the outer peripheral wall of the tubular threaded joint.

[0013] According to some embodiments of the utility model, two bosses are provided on the inner wall of the first center hole, and the return joint and the tubular threaded joint are respectively abutted against different bosses after being connected to the tubular drill pipe. The bosses are connected with sealing rings, and the sealing rings are used to prevent water leakage in the first center hole.

[0014] According to some embodiments of the present invention, the outer diameters of the tubular threaded joint, the tubular drill pipe, and the return joint are equal.

[0015] A combined large-diameter raise drill rod according to an embodiment of the utility model has at least the following beneficial effects:

[0016] (1) The tubular drill pipe and the return joint are pre-assembled. The tubular drill pipe and the tubular threaded joint are pre-assembled. During the drilling process, the tubular drill pipe and the return joint can be installed together, thereby improving the drilling efficiency;

[0017] (2) The stabilizing column on the return joint uses the water transported in the tubular drill pipe to provide resistance so that the return joint can continuously be subjected to the force directed toward the center of the drill hole;

[0018] (3) The service life is increased by installing a cladding wear-resistant belt.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 A schematic diagram of an installation structure of an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of a tubular threaded joint according to an embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of a return joint according to an embodiment of the utility model;

[0024] Figure 4 A cross-sectional schematic diagram of an embodiment of the utility model;

[0025] Figure 5 for Figure 4 The enlarged view of point A in the middle;

[0026] Figure 6 for Figure 4 Enlarged view of point B in the middle.

[0027] Figure Number:

[0028] Tubular threaded joint 100, second center hole 110;

[0029] Tubular drill rod 200, first central hole 210, boss 211;

[0030] The return joint 300, the third center hole 310, the guide hole 320, the limit cylinder 321, the throttle hole 330, and the one-way valve 340;

[0031] Stabilizing device 400 , stabilizing column 410 , limiting ring 411 , and ball 420 . DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0036] Reference Figures 1 to 6As shown, a combined large-diameter skylight drill pipe of an embodiment of the utility model comprises: a plurality of tubular threaded joints 100, a plurality of tubular drill pipes 200, and a plurality of return joints 300. Adjacent tubular drill pipes 200 are connected via return joints 300 or tubular threaded joints 100; the tubular threaded joints 100 and the tubular drill pipe 200 are interference-connected via a tapered thread pair; the return joint 300 and the tubular drill pipe 200 are interference-connected via a tapered thread pair, and the connection method between the tubular threaded joint 100 and the tubular drill pipe 200 is prior art, so it will not be described in detail. A fixed structural adhesive is provided at the tapered thread pair at one end of the tubular drill pipe 200. To ensure a stable connection. The tapered thread pair at the other end of the tubular drill pipe 200 is not provided with a fixed structural adhesive, so as to facilitate disassembly. The return joint 300 and the tubular drill pipe 200 are both formed by cylindrical steel pipes. The connection method between the return joint 300 and the tubular drill pipe 200 is a prior art, so it will not be described in detail. The tubular threaded joint 100 is made of thick-walled tubular body material to improve the strength of the threaded connection part, and the tubular drill pipe 200 is made of thin-walled tubular body material. Such a setting can effectively save the processing cost and material cost of the drill pipe, thereby reducing the cost of the entire drill pipe; on the other hand, due to the thin-wall setting of the tubular drill pipe 200, the flexibility of the drill pipe can be increased to release the bending load caused by the bending of the wellbore during operation. It is foreseeable that the tubular drill pipe 200 can also be connected to the return joint 300 or the tubular threaded joint 100 by other detachable connection methods. The return joint 300 is connected to a stabilizing device 400 for pushing the tubular drill pipe 200 to automatically return to the center of the borehole. When the tubular drill pipe 200 is working, it may be slightly deformed when subjected to axial thrust, causing it to rotate around its own rotation axis and move eccentrically in the borehole. When the tubular drill pipe 200 deviates in the borehole, the stabilizing device 400 on the return joint 300 will continuously approach and move away from the inner wall of the borehole. In the process of the tubular drill pipe 200 approaching the inner wall of the borehole, the stabilizing device 400 provides resistance, so that the tubular drill pipe 200 automatically returns to the center of the borehole. The tubular threaded joint 100 and the return joint 300 are pre-assembled on the tubular drill pipe 200. When drilling, the tubular drill pipe 200 with the tubular threaded joint 100 or the tubular drill pipe 200 with the return joint 300 is selected as needed. The distance between two adjacent return joints 300 is determined by the actual working conditions of the borehole, and is generally 3m to 8m apart.

[0037] Reference Figure 1 and Figure 4As shown, it can be understood that two tubular drill rods 200 and a tubular threaded joint 100 are arranged between two adjacent return joints 300. Since the length of the tubular drill rod 200 in the prior art is generally 1.5m to 3m, connecting two tubular drill rods 200 and a tubular threaded joint 100 at two adjacent return joints 300 can make the distance between the two return joints 300 be 3m to 8m.

[0038] Reference Figures 1 to 6 As shown, it can be understood that the center of the tubular drill pipe 200, the tubular threaded joint 100 and the return joint 300 are respectively provided with a first center hole 210, a second center hole 110 and a third center hole 310 for water flow. Since the drill bit generates heat when rubbing against the soil layer during drilling, it needs to be cooled by water, and water can also wash away the debris generated during drilling, so water is transported through the first center hole 210, the second center hole 110 and the third center hole 310. When drilling upward, the pressure of the water in the first center hole 210, the second center hole 110 and the third center hole 310 ranges from 0.8MPa to 2MPa. In order to provide sufficient water pressure to supply water to the drill bit, the water pressure when drilling downward can be appropriately reduced to reduce energy consumption.

[0039] Reference Figures 1 to 6As shown, it can be understood that the stabilizing device 400 includes a stabilizing column 410 and a ball 420. The outer wall of the return joint 300 is provided with a guide hole 320 extending radially along the return joint 300. Four guide holes 320 are symmetrically arranged around the rotation axis of the return joint 300. The stabilizing column 410 partially extends into the guide hole 320 and can slide along the guide hole 320. The guide hole 320 guides the stabilizing column 410. The stabilizing column 410 can only move radially along the return joint 300. When the return joint 300 rotates eccentrically in the borehole, the stabilizing column 410 will continuously approach and move away from the inner wall of the borehole. The role of the roller is to contact the inner wall of the borehole to reduce the friction between the stabilizing column 410 and the inner wall of the borehole. The ball 420 is rotatably mounted on the end of the stabilizing column 410 away from the return joint 300. The specific connection method of the stabilizing column 410 and the ball 420 is a prior art, so it will not be described in detail. When the stabilizing column 410 rotates with the return joint 300 and approaches the inner wall of the borehole, the roller contacts the inner wall of the borehole, pushing the stabilizing column 410 toward the rotation axis of the return joint 300. The guide hole 320 is connected to the third center hole 310 through the throttle hole 330. The water in the third center hole 310 can enter the guide hole 320 through the throttling hole 330. The guide hole 320 also plays a role similar to that of a hydraulic cylinder. The water in the guide hole 320 can also enter the third center hole 310 from the throttling hole 330. When the stabilizing column 410 is close to the rotation axis of the return joint 300, it squeezes the water in the guide hole 320 and forces the water in the guide hole 320 to enter the third center hole 310 from the throttling hole 330. Due to the throttling effect of the throttling hole 330, the stabilizing column 410 will generate greater resistance in the process of approaching the return joint 300. Since the force is mutual, the inner wall of the borehole pushes the stabilizing column 410 close to the rotation axis of the return joint 300, and the return joint 300 also generates an equal and opposite force on the inner wall of the borehole. Therefore, the swivel joint can periodically generate a force pointing to the center of the borehole to the return joint 300 when rotating, so as to return the swivel joint.

[0040] Reference Figure 5 As shown, it can be understood that a one-way valve 340 is also provided between the guide hole 320 and the third center hole 310. When the stabilizing column 410 rotates with the return joint 300 until the ball 420 is separated from the inner wall of the borehole, the water in the third center hole 310 enters the guide hole 320 through the throttle hole 330 to push the stabilizing column 410 to move away from the rotation axis of the swivel joint. Due to the throttling effect of the throttle hole 330, the speed of the stabilizing column 410 away from the rotation axis of the swivel joint is very slow, so the one-way valve 340 is provided to allow the water in the third center hole 310 to enter the guide hole 320 through the one-way valve 340. The speed of the stabilizing column 410 away from the rotation axis of the swivel joint is increased so that the ball 420 can always be against the inner wall of the borehole, thereby improving the stability of the rotation of the swivel joint.

[0041] Reference Figures 1 to 6 As shown, it can be understood that a limiting ring 411 is provided at one end of the stabilizing column 410 extending into the guide hole 320, and the limiting ring 411 is integrally formed with the stabilizing column 410, and a sealing ring is provided between the limiting ring 411 and the inner wall of the guide hole 320 to prevent water in the guide hole 320 from leaking to the outside of the return joint 300. The diameter of the limiting ring 411 is larger than the diameter of the stabilizing column 410. It can be foreseen that, for the convenience of manufacturing, the limiting ring 411 and the stabilizing column 410 can be manufactured separately, and then the limiting ring 411 is sleeved on the stabilizing column 410 and threadedly connected during assembly. The limiting cylinder 321 is threadedly connected in the guide hole 320, and the inner diameter of the limiting cylinder 321 is smaller than the outer diameter of the limiting ring 411. The limiting ring 411 cannot pass through the limiting cylinder 321, while the stabilizing column 410 can pass through the limiting cylinder 321, and the limiting cylinder 321 cooperates with the limiting ring 411 to prevent the stabilizing column 410 from detaching from the guide hole 320. When the stabilizing column 410 moves away from the rotation axis of the return joint 300, the limiting cylinder 321 abuts against the limiting ring 411 to limit the travel of the stabilizing column 410. The threaded connection between the limiting ring 411 and the guide hole 320 also simplifies the installation and disassembly process.

[0042] Reference Figures 1 to 6 As shown, it can be understood that the tubular drill pipe 200, the tubular threaded joint 100 and the return joint 300 are all provided with a surfacing wear-resistant belt. The thickness of the surfacing wear-resistant belt is 3 mm and the width is 70 mm. The surfacing wear-resistant belt material is an iron-based alloy and tungsten carbide particles, and is processed by plasma arc surfacing. It can effectively reduce the wear of the tubular drill pipe 200, the tubular threaded joint 100 and the return joint 300.

[0043] Reference Figures 1 to 6 As shown, it can be understood that a first clamping groove is provided on the outer peripheral wall of the tubular threaded joint 100. The size and shape of the first clamping groove match the clamping device on the raise boring machine used for easy transportation.

[0044] Reference Figures 1 to 6 As shown, it can be understood that two bosses 211 are provided on the inner wall of the first center hole 210. The precision requirement of the bosses 211 is not high, and they can be manufactured separately and then welded on the inner wall of the first center hole 210. After the return joint 300 and the tubular threaded joint 100 are connected to the tubular drill pipe 200, they are respectively against different bosses 211, so the bosses 211 can play the role of axial limit. The pressure of the water in the first center hole 210 is between 0.8MPa and 2MPa, so the water may leak from the tapered thread pair between the return joint 300 and the tubular drill pipe 200, and the water may also leak from the tapered thread pair between the tubular threaded joint 100 and the tubular drill pipe 200. The bosses 211 are connected with sealing rings, which are used to prevent the water in the first center hole 210 from leaking out of the tubular drill pipe 200.

[0045] Reference Figure 1 As shown, it can be understood that the outer diameters of the tubular threaded joint 100, the tubular drill pipe 200, and the return joint 300 are equal, which is beneficial to reduce the resistance during the axial movement.

[0046] Working principle: When the return joint 300 rotates eccentrically in the borehole, the stabilizing column 410 will continuously cycle close to and away from the inner wall of the borehole. When the stabilizing column 410 approaches the inner wall of the borehole, the roller contacts the inner wall of the borehole, pushing the stabilizing column 410 close to the rotation axis of the return joint 300. The water in the guide hole 320 enters the third center hole 310 from the throttle hole 330. When the stabilizing column 410 approaches the rotation axis of the return joint 300, it squeezes the water in the guide hole 320, forcing the water in the guide hole 320 to enter the third center hole 310 from the throttle hole 330. Due to the throttling effect of the throttle hole 330, the stabilizing column 410 will generate greater resistance when approaching the return joint 300, so that the inner wall of the borehole generates a force pointing to the center of the borehole on the return joint 300, pushing the swivel joint to return. When the stabilizing column 410 continues to rotate with the return joint 300 until the ball 420 is separated from the inner wall of the borehole, the water in the third central hole 310 enters the guide hole 320 through the throttle hole 330 and the one-way valve 340 to push the stabilizing column 410 to move away from the rotation axis of the swivel joint, so that the ball 420 can always be against the inner wall of the borehole.

[0047] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A combined large-diameter raise drill pipe, characterized in that: include: A plurality of tubular threaded joints (100); A plurality of tubular drill rods (200), wherein the tubular threaded joint (100) is interference-connected with the tubular drill rods (200) via a tapered thread pair; A plurality of return joints (300) are provided, wherein the return joints (300) are interference-connected with the tubular drill pipe (200) via a tapered thread pair, and a stabilizing device (400) is connected to the return joint (300) for pushing the tubular drill pipe (200) to automatically return to the center of the borehole.

2. The combined large-diameter raise drill pipe according to claim 1, characterized in that: Two tubular drill rods (200) and one tubular threaded joint (100) are arranged between two adjacent return joints (300).

3. The combined large-diameter raise drilling rod according to claim 2, characterized in that: The tubular drill rod (200), the tubular threaded joint (100) and the return joint (300) are respectively provided with a first center hole (210), a second center hole (110) and a third center hole (310) for water to flow through at their centers.

4. The combined large-diameter raise drilling rod according to claim 3 is characterized in that: The stabilizing device (400) comprises a stabilizing column (410) and a ball bearing (420); the outer wall of the return joint (300) is provided with a guide hole (320) extending radially along the return joint (300); the stabilizing column (410) partially extends into the guide hole (320) and can slide along the guide hole (320); the ball bearing (420) is rotatably mounted on one end of the stabilizing column (410) away from the return joint (300); and the guide hole (320) is connected to the third center hole (310) through a throttle hole (330).

5. The combined large-diameter raise boring bar according to claim 4, characterized in that: A one-way valve (340) is also provided between the guide hole (320) and the third center hole (310), and water in the third center hole (310) can enter the guide hole (320) through the one-way valve (340).

6. The combined large-diameter raise drilling rod according to claim 5, characterized in that: A limiting ring (411) is arranged at one end of the stabilizing column (410) extending into the guide hole (320); the diameter of the limiting ring (411) is larger than the diameter of the stabilizing column (410); a limiting cylinder (321) is threadedly connected in the guide hole (320); the stabilizing column (410) passes through the limiting cylinder (321); the limiting cylinder (321) cooperates with the limiting ring (411) to prevent the stabilizing column (410) from escaping from the guide hole (320).

7. The combined large-diameter raise boring bar according to claim 6, characterized in that: The tubular drill pipe (200) is provided with a cladding wear-resistant belt.

8. The combined large-diameter raise boring bar according to claim 7, characterized in that: The outer peripheral wall of the tubular threaded joint (100) is provided with a first clamping groove.

9. The combined large-diameter raise boring bar according to claim 8, characterized in that: The inner wall of the first center hole (210) is provided with two bosses (211); after being connected to the tubular drill rod (200), the return joint (300) and the tubular threaded joint (100) respectively abut against different bosses (211); the bosses (211) are connected with sealing rings, and the sealing rings are used to prevent water leakage in the first center hole (210).

10. The combined large-diameter raise boring bar according to claim 9, characterized in that: The outer diameters of the tubular threaded joint (100), the tubular drill pipe (200), and the return joint (300) are equal.

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