A reamer drill pipe

Abstract

The utility model discloses a reaming type drill rod, be equipped with drill rod hollow section on the drill rod, be equipped with two tooth bars and two support poles in the drill rod hollow section, the left side head end of tooth bar and the right side head end of support pole are connected with the drill rod through hinged structure respectively, the outside end surface of tooth bar is equipped with alloy ball tooth, a plurality of fixed holes are equipped on the right side end of tooth bar at intervals, the left side end of support pole also is equipped with fixed hole, tooth bar opens out a certain angle outward, after the fixed hole on the fixed hole on tooth bar and support pole is passed through through pin shaft, two are fixed together, the connecting place of upper and lower tooth bar and support pole is also connected together through annular fixed rod, still include the protection sleeve that can insert the drill rod hollow section therein. Realize multi -gear reaming through different hole position combination, after operation, tooth bar and support pole are recycled to hollow section and are locked by protection sleeve. The structure can complete reaming without disassembling drill rod, can shorten the downtime and improve the torsional reliability, is applicable to the reaming operation of downhole extraction hole.

Description

Technical Field

[0001] This utility model relates to a drill rod structure, particularly a hole-reaming drill rod, and belongs to the technical field of drilling equipment. Background Technology

[0002] my country's coal storage environment is complex, and mining is primarily underground. Methane, a substance coexisting with coal, causes numerous safety accidents during coal mining, severely hindering the efficient development of coal mining. However, methane is also a clean energy source with a calorific value comparable to natural gas, and its abundant reserves offer considerable potential for utilization. Therefore, extracting and utilizing coal seam methane can not only eliminate coal seam methane hazards but also alleviate the current energy shortage. However, my country's coal seam geology is complex, with high methane content, strong adhesion, and poor permeability, making methane extraction difficult. To ensure the safety of methane tunnels and coal face uncovering operations, permeability enhancement measures must be implemented before operations to improve methane extraction efficiency. Commonly used methods for enhancing coal seam permeability include hydraulic perforation and high-pressure air fracturing. For coal seams with low permeability or poor permeability enhancement, repeated permeability enhancement is necessary. To stabilize the enhanced coal seam and rock strata, protective casing is required during drilling. Therefore, it is necessary to replace the drill bit with one of a slightly larger diameter to achieve the purpose of enlarging the hole, so that the casing can be smoothly lowered into the coal seam.

[0003] Existing borehole enlargement methods often require disassembling and replacing drill bits underground, resulting in long downtime, high labor intensity, and low construction efficiency. In addition, the poor lighting conditions underground, the large space occupied by the equipment, and the inconvenience of personnel operation make it difficult to carry and manage drill bits of different specifications, which are also prone to being lost. Utility Model Content

[0004] The purpose of this invention is to provide a hole-reaming drill pipe. Through a multi-stage hole-reaming structure with reliable locking, it achieves the hole-reaming function that traditionally required changing the drill bit, thereby effectively improving the efficiency and adaptability of downhole hole-reaming operations.

[0005] The technical solution of this utility model is as follows: A hole-expanding drill rod includes a drill rod with a hollow section. Two toothed rods and two support rods are arranged in upper and lower layers within the hollow section. The left ends of the two toothed rods and the right ends of the two support rods are hinged to the drill rod via a hinge structure. Alloy ball teeth are provided on the outer end face of the right end of the toothed rod. Multiple fixing holes are spaced apart on the right end of the toothed rod, and fixing holes are also provided on the left end of the support rod. After the toothed rod opens outward at a certain angle, a pin passes through the fixing holes on the upper toothed rod and support rod to fix them together. The lower toothed rod and support rod have the same structure. The connection between the upper and lower toothed rods and support rods is also connected by an annular fixing rod. The system also includes a protective sleeve into which the hollow section of the drill rod can be inserted.

[0006] In the aforementioned type of borehole-expanding drill rod, two annular fixing rods are provided, one at the front end and one at the rear end of the connection between the upper and lower toothed rods and the support rod.

[0007] In the aforementioned type of reaming drill rod, after the pin passes through the fixing holes on the toothed rod and the support rod, both ends of the pin extend to the outside. The pin extending to the outside is provided with external threads. Each annular fixing rod has two screw caps on the movable sleeve. The screw caps are provided with internal threads, and the internal threads of the screw caps are threaded together with the external threads on the pin.

[0008] In the aforementioned type of reaming drill rod, a countersink is provided on the facing end faces of the right sides of the two tooth rods. Multiple fixing holes are provided at intervals on the tooth rods at the location of the countersink. After the left end of the support rod extends into the countersink, the two are fixed together by passing through the fixing holes on the tooth rod and the support rod with a pin.

[0009] In the aforementioned type of reaming drill rod, the alloy ball teeth are made of cemented carbide and have undergone surface hardening treatment, and the annular fixing rod is made of alloy steel and has a wear-resistant coating.

[0010] The beneficial effects of this utility model are as follows: Compared with the prior art, the reaming drill rod of this utility model has a hollow section on the drill rod, with a built-in reaming component that can be flipped outward and locked. When reaming is required, the reaming component rotates outward from inside the hollow section of the drill rod and is quickly locked by a support rod and a ring-shaped fixing rod, forming different reaming diameters according to different hole positions. After the operation is completed, the reaming component is retracted into the hollow section of the drill rod and locked in place by a protective sleeve. Therefore, it eliminates the need for frequent replacement of large-diameter drill bits in narrow and dimly lit tunnels, achieving substitution and compatibility for multiple hole diameters, reducing the need to carry and manage multiple specifications of drill bits, significantly reducing downtime and workload, and improving construction efficiency and safety. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the structure of the toothed bar of this utility model when it is not open;

[0013] Figure 3 for Figure 2 A top view of the structure without the protective cover;

[0014] Figure 4 for Figure 1 A schematic diagram of the right-side view structure;

[0015] Figure 5 for Figure 4 Enlarged schematic diagram of a part

[0016] Figure 6 This is a schematic diagram of the ring-shaped fixing rod.

[0017] Reference numerals: 1-Drill pipe, 2-Protective sleeve, 3-Tooth rod, 4-Alloy ball tooth, 5-Hinged structure, 6-Counter groove, 7-Fixing hole, 8-Support rod, 9-Annular fixing rod, 10-Threaded cap, 11-Hollow section of drill pipe, 12-Pin. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0019] An embodiment of this utility model: A hole-expanding drill rod includes a drill rod 1, a hollow section 11 on the drill rod 1, and a countersunk groove with an opening at the top and bottom on the drill rod 1. Two toothed rods 3 and two support rods 8 are arranged in upper and lower layers inside the hollow section 11. The left ends of the two toothed rods 3 are respectively hinged to the drill rod 1 via a hinge structure 5. The right ends of the two support rods 8 are respectively hinged to the drill rod 1 via a hinge structure 5. Alloy ball teeth 4 are provided on the outer end face of the right end of the two toothed rods 3. Multiple fixing holes 7 are provided at intervals on the right end of the toothed rods 3. Fixing holes 7 are also provided on the left end of the support rods 8. When hole enlargement is required, the toothed rod 3 rotates outward at a certain angle around the hinged connection end with the drill rod 1, and at the same time, the support rod 8 rotates outward at a certain angle around the hinged connection end with the drill rod 1, so that the fixing hole 7 on the support rod 8 is aligned with a fixing hole 7 on the toothed rod 3. Then, a pin 12 passes through the fixing hole 7 on the upper toothed rod 3 and the upper support rod 8 to fix the upper toothed rod 3 and the upper support rod 8 together. The lower toothed rod 3 and the support rod 8 have the same structure. At the same time, the connection between the upper and lower toothed rods 3 and the support rod 8 is also connected by an annular fixing rod 9. It also includes a protective sleeve 2 into which the hollow section 11 of the drill rod can be inserted.

[0020] Two annular fixing rods 9 are provided, one at each end of the connection between the upper and lower gear rods 3 and the support rod 8. That is, both ends of the two pins 12 extend outside the gear rod 3. The exposed front ends of the two pins 12 are connected together by one annular fixing rod 9, while the exposed rear ends of the two pins 12 are connected together by the other annular fixing rod 9. The two annular fixing rods 9 provide better locking and fixing of the gear rod 3, resulting in better overall structural stability.

[0021] After the pin 12 passes through the fixing holes 7 on the rack 3 and the support rod 8, both ends of the pin 12 extend to the outside. The pin 12 extending to the outside is provided with external threads. Each annular fixing rod 9 has two screw caps 10 movably fitted on it. After the two screw caps 10 are movably fitted on the annular fixing rod 9, the two ends are processed to form two limit end caps with larger dimensions. The limit end caps prevent the screw caps 10 from coming off the annular fixing rod 9. The screw caps 10 are provided with internal threads. The internal threads of the screw caps 10 are threaded together with the external threads on the pin 12, thereby realizing the quick connection between the annular fixing rod 9, the rack 3 and the support rod 8. The screw caps 10 rotate so that the pin 12 extends into them until it abuts against the limit end caps of the annular fixing rod 9. The annular fixing rod 9 will not rotate with the screw caps 10 during the rotation of the screw caps 10.

[0022] Each of the two toothed rods 3 has a countersunk groove 6 on its facing right end face. Multiple fixing holes 7 are spaced apart on the toothed rod 3 at the location of the countersunk groove 6. After the left end of the support rod 8 extends into the countersunk groove 6, it passes through the fixing holes 7 on both the toothed rod 3 and the support rod 8 via a pin 12, thus fixing them together. This structure only requires a support rod 8 directly above or below the toothed rod 3. The left end of the support rod 8 extends into the countersunk groove 6, facilitating the alignment of the fixing holes 7 on the support rod 8 with those on the toothed rod 3. After the pin 12 is inserted, the toothed rod 3 can be well supported.

[0023] The alloy ball teeth 4 are made of hard alloy and have undergone surface hardening treatment, and the annular fixing rod 9 is made of alloy steel and has a wear-resistant coating, which can improve the structural strength and service life of the components.

[0024] The present invention relates to a drill rod for expanding holes, comprising a drill rod 1, a protective sleeve 2, a toothed rod 3, an alloy ball tooth 4, a hinge structure 5, a countersunk groove 6, a fixing hole 7, a support rod 8, an annular fixing rod 9, a screw cap 10, a hollow section of the drill rod 11, and a pin 12.

[0025] The drill rod 1 has a hollow section 11 containing a toothed rod 3, a hinge structure 5, and a support rod 8. The toothed rod 3 is equipped with alloy ball teeth 4, and has a countersunk groove 6 and a fixing hole 7. The support rod 8 is also equipped with a fixing hole 7.

[0026] In normal placement, the toothed rod 3 and support rod 8 can be hidden in the hollow section 11 of the drill rod. When reaming is required, the protective sleeve 2 on the drill rod 1 is removed, and the opening angle of the toothed rod 3 and support rod 8 is adjusted through the hinge structure 5 inside the hollow section 11 of the drill rod to achieve the required reaming diameter. The hidden toothed rod 3 and support rod 8 are then fixed together by the pin 12, and then the pin 12 is fixedly connected to the annular fixing rod 9 by the screw cap 10, forming a relatively stable and firm locking structure for the toothed rod 3. This ensures that the height of the toothed rod 3 is fixed, and the support rod 8 provides vertical support for the toothed rod 3. The annular fixing rod 9 provides lateral support when the toothed rod 3 rotates and digs. During reaming, the rotation of the drill 1 drives the toothed rod 3, support rod 8, and annular fixing rod 9 to rotate together, and the reaming is achieved through the cutting action of the alloy ball teeth 4 on the toothed rod 3.

[0027] When the reaming is complete, first loosen the screw cap 10 to separate the pin 12 from the annular fixing rod 9. Then pull out the pin 12 and insert the toothed rod 3 and support rod 8 back into the hollow section 11 of the drill rod 1 through the hinge structure 5. Finally, cover with the protective sleeve 2. This ensures that the toothed rod 3 and support rod 8 remain closed during the transportation of the drill rod 1.

[0028] The rack 3 and the support rod 8 are connected to the drill rod 1 by the hinge structure 5. If damage occurs, the rack 3 and the support rod 8 can be replaced by disassembling the hinge structure 5.

[0029] The top of the support rod 8 is provided with a fixing hole 7 of the same size as the fixing hole 7 on the toothed rod 3. When fixing the angle of the toothed rod 3, the toothed rod 3 is aligned with the fixing hole 7 in the support rod 8 and then fixed with the pin 12. Finally, the annular fixing rod 9 and the pin 12 are fixed together by the screw cap 10.

[0030] Both ends of the annular fixing rod 9 have screw caps 10. The diameter of the enlarged hole is determined by the fixing holes 7 at different positions on the toothed rod 3 and the fixing holes 7 on the support rod 8. As shown in the attached drawings of this utility model, the toothed rod 3 of this utility model has three fixing holes 7. When the fixing holes 7 of the support rod 8 are connected to the three fixing holes 7 at different positions on the toothed rod 3, three different enlarged hole diameters can be provided. Different sizes of annular fixing rods 9 are required to match the different enlarged hole diameters.

Claims

1. A type of drill rod for expanding boreholes, characterized in that: The drill rod (1) includes a drill rod (1) with a hollow section (11). Inside the hollow section (11), two toothed rods (3) and two support rods (8) are arranged in upper and lower layers. The left ends of the two toothed rods (3) and the right ends of the two support rods (8) are respectively hinged to the drill rod (1) via a hinge structure (5). The outer end face of the right end of the toothed rod (3) is provided with alloy ball teeth (4). Multiple fixing holes (7) are spaced apart on the right end of the toothed rod (3). (8) also has a fixing hole (7) on the left side. After the toothed rod (3) opens outward at a certain angle, it passes through the fixing hole (7) on the upper toothed rod (3) and the support rod (8) through the pin (12) and fixes the two together. The lower toothed rod (3) and the support rod (8) have the same structure. The connection between the upper and lower toothed rods (3) and the support rod (8) is also connected by a ring fixing rod (9). It also includes a protective sleeve (2) into which the hollow section (11) of the drill rod can be inserted.

2. The reaming drill rod according to claim 1, characterized in that: The annular fixing rod (9) is provided in two parts, with one rod at the front and one at the rear end of the connection between the upper and lower toothed rods (3) and the support rod (8).

3. A borehole-reaming drill rod according to claim 2, characterized in that: After the pin (12) passes through the fixing hole (7) on the rack (3) and the support rod (8), its two ends extend to the outside. The pin (12) extending to the outside is provided with external thread. Each annular fixing rod (9) has two screw caps (10) on its movable sleeve. The screw caps (10) are provided with internal thread. The internal thread of the screw caps (10) is threaded together with the external thread on the pin (12).

4. The reaming drill rod according to claim 1, characterized in that: Each of the two toothed rods (3) has a groove (6) on the opposite end face of the right side. The toothed rod (3) at the location of the groove (6) has multiple fixing holes (7) spaced apart. After the left end of the support rod (8) extends into the groove (6), the two are fixed together by passing through the fixing holes (7) on the toothed rod (3) and the support rod (8) through the pin (12).

5. A borehole-reaming drill rod according to claim 1, characterized in that: The alloy ball teeth (4) are made of hard alloy and have undergone surface hardening treatment, and the annular fixing rod (9) is made of alloy steel and has a wear-resistant coating.

Images