Drill rod with variable outer diameter

Abstract

The drill rod with the variable outer diameter comprises a drill rod body, the drill rod body comprises an inner-layer drill rod and an outer-layer drill rod matched with the inner diameter of a drill hole in size, the outer-layer drill rod coaxially sleeves the inner-layer drill rod, and the outer-layer drill rod and the inner-layer drill rod are circumferentially limited through a hexagonal limiting piece, so that the outer-layer drill rod and the inner-layer drill rod are linked. The male connectors of the drill rod bodies face upwards, the female connectors of the drill rod bodies face downwards, and after the adjacent drill rod bodies are connected end to end, the female connector of the upper drill rod body is used for axially limiting the outer-layer drill rod of the lower drill rod body. According to the utility model, the inner-layer drill rod and the outer-layer drill rod are arranged, and the outer-layer drill rod is movably sleeved outside the inner-layer drill rod, so that the purpose of replacing drill rods with different outer diameters in the prior art can be achieved by quickly replacing the outer-layer drill rod when different hole diameters are constructed; the inner-layer drill rod with higher cost can adapt to various different outer diameter sizes, and the outer-layer drill rod with low cost greatly reduces the cost investment of a construction party.

Description

Technical Field

[0001] The utility model relates to a drill rod with a variable outer diameter. Background Art

[0002] In the current large-diameter drilling construction technology, the design of the drill rod usually adopts an inner and outer two-layer structure, which is fixed together by welding to form an inseparable whole. However, this structure exposes its limitations when facing the construction needs of different apertures. Whenever a different aperture needs to be changed for construction, the corresponding drill rod must also be replaced, which undoubtedly increases the types of drill rods required during the construction process, resulting in a substantial increase in costs. In this case, the construction party has to stock up on drill rods of various specifications to meet the construction needs of different apertures, which not only increases inventory costs, but also reduces the flexibility and efficiency of construction. Utility Model Content

[0003] The utility model solves the shortcomings of the prior art and provides an inner drill rod equipped with outer drill rods of various sizes, which can switch the outer drill rods only according to the hole diameter to be constructed, thus greatly saving costs.

[0004] To achieve the above-mentioned purpose, the utility model first proposes a drill rod with a variable outer diameter, including a drill rod body, wherein the drill rod body includes an inner drill rod and an outer drill rod matching the inner diameter of the borehole, the outer drill rod is coaxially sleeved on the outside of the inner drill rod, and the outer drill rod and the inner drill rod are circumferentially limited by a hexagonal limiter, so that the outer drill rod and the inner drill rod are linked. When in use, the male joint of the drill rod body faces upward and the female joint faces downward. After the adjacent drill rod bodies are connected end to end, the outer drill rod of the next drill rod body is axially limited by the female joint of the previous drill rod body.

[0005] The inner drill rod has the same function as the conventional drill rod, which transmits torque, connects the upper and lower parts, and delivers high-pressure air. The outer drill rod mainly reduces the gap between the drill rod and the hole wall, adjusts the outer diameter, and makes the slag discharge smoother. With the above structure, the outer drill rod can be set in multiple models, so that the outer drill rod with the appropriate diameter can be selected according to the hole diameter to be drilled. In this way, one size of inner drill rod can be matched with multiple sizes of outer drill rods, which can be switched according to the hole diameter to be constructed, which greatly saves costs.

[0006] In this embodiment, the inner drill rod includes a hexagonal male joint, a tube body and a hexagonal female joint. The hexagonal male joint matches the hexagonal female joint. The two ends of the tube body are coaxially welded with the hexagonal male joint and the hexagonal female joint. The hexagonal male joint and the hexagonal female joint are both provided with a first pin hole perpendicular to the axis. After the hexagonal male joint is inserted into the hexagonal female joint, the hexagonal male joint and the hexagonal female joint are axially limited by a pin inserted in the first pin hole.

[0007] In this embodiment, the outer drill pipe includes an upper support plate, an outer sleeve and a lower support plate. The outer diameter of the outer sleeve matches the inner diameter of the hole to be drilled. The upper support plate is fixed to one end of the outer sleeve near the hexagonal male joint, and the lower support plate is fixed to one end near the hexagonal female joint. The outer sleeve is sleeved on the outside of the inner drill pipe and is supported and positioned on the inner drill pipe by the upper support plate and the lower support plate on both sides.

[0008] In this embodiment, the hexagonal male connector includes an insertion end for being inserted into the hexagonal female connector and a connecting end for connecting the insertion end to the tube body. An external hexagon is milled on the connecting end of the hexagonal male connector near the joint between the connecting end and the insertion end. The external hexagon on the hexagonal male connector forms the hexagonal limiter. The upper support plate is an annular plate. The upper support plate corresponds to the position of the external hexagon. An internal hexagonal hole matching the size of the external hexagon is provided in the middle of the upper support plate. After the outer drill rod is mounted on the inner drill rod, the upper support plate is clamped on the external hexagon of the hexagonal male connector through the internal hexagonal hole.

[0009] In this embodiment, a convex ring with an outer diameter greater than the outer diameter of the hexagonal female connector is provided on the outer wall of the hexagonal female connector and at one end away from the tube body, and the convex ring forms a step on the outer wall of the hexagonal female connector, and the lower support plate is an annular plate, and the inner diameter of the lower support plate matches the outer diameter of the hexagonal female connector. After the outer layer drill rod is sleeved on the inner layer drill rod, the lower support plate is sleeved on the outside of the hexagonal female connector, and the lower support plate is close to the step, and the step acts as a protective device to prevent the outer layer drill rod from falling off after falling off.

[0010] In this embodiment, the axial length of the outer sleeve matches the axial distance from the outer hexagon to the end of the hexagonal female connector.

[0011] In this embodiment, two lower support plates arranged parallel to each other are provided on the outer drill rod, and the outer drill rod is supported on the hexagonal female joint through the two lower support plates. A second pin hole is provided on the outer sleeve and between adjacent lower support plates, and the second pin hole corresponds to the position of the first pin hole. After the adjacent drill rod bodies are connected, the pin passes through the second pin hole and the first pin hole, and the pin is axially limited in the second pin hole and the first pin hole by the cotter pin, so that the outer sleeve, the hexagonal male joint and the hexagonal female joint are axially locked.

[0012] In this embodiment, a pin groove is provided on the outer sleeve at the position of the second pin hole to prevent the two ends of the plug pin from extending out of the outer sleeve.

[0013] With the above structure, the utility model has the following advantages:

[0014] 1. The inner drill rod of this device has the same function as the traditional conventional drill rod, which plays the role of transmitting torque, connecting the upper and lower parts, and conveying high-pressure air. The outer drill rod mainly reduces the gap between the drill rod and the hole wall, adjusts the outer diameter, and makes the slag discharge smoother. With the above structure, the outer drill rod can be set to multiple models, so that the outer drill rod with a suitable diameter can be selected according to the hole diameter to be drilled. In this way, one size of inner drill rod can be matched with multiple sizes of outer drill rods, which can be switched according to the hole diameter to be constructed, greatly saving costs.

[0015] 2. After the outer drill rod of the device is sleeved on the inner drill rod, the inner hexagon of the upper support plate is clamped on the outer hexagon of the hexagonal male joint. In this way, the cooperation between the inner hexagonal hole and the outer hexagonal hole is utilized to realize the linkage between the outer drill rod and the hexagonal male joint, and at the same time, the convenience of installation of the outer drill rod is also ensured. After the outer drill rod is sleeved on the inner drill rod, the lower support plate is sleeved on the outside of the hexagonal female joint. The lower support plate is close to the step, and the step acts as a protective device to prevent the outer drill rod from falling off. At the same time, after the hexagonal female joint of the upper drill rod body is connected to the hexagonal male joint of the next drill rod body, the end of the hexagonal female joint of the upper drill rod body will be pressed on the upper support plate of the next drill rod body, thereby limiting the up and down movement of the outer drill rod.

[0016] To sum up, the device is provided with inner and outer drill rods, and the outer drill rod is movably sleeved on the outside of the inner drill rod. When constructing different hole diameters, the purpose of replacing drill rods of different outer diameters in the prior art can be achieved by quickly replacing the outer drill rod. In this way, the more expensive inner drill rod can be adapted to a variety of different outer diameter sizes and low-cost outer drill rods, greatly reducing the cost investment of the construction party. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of two drill rods connected end to end in the utility model.

[0018] Figure 2 It is a structural schematic diagram of the utility model.

[0019] Figure 3 for Figure 1 Cross-sectional view at EE.

[0020] Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0021] In the accompanying drawings: 1. outer drill rod; 11. outer sleeve; 12. upper support plate; 13. lower support plate; 14. pin groove; 2. inner drill rod; 21. pipe body; 22. hexagonal male connector; 23. hexagonal female connector; 221. outer hexagon; 3. latch; 31. cotter pin; 4. first pin hole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] like Figures 1 to 4 As shown, a drill rod with a variable outer diameter includes a drill rod body, wherein the drill rod body includes an inner drill rod 2 and an outer drill rod 1. The inner drill rod 2 has the same function as a traditional conventional drill rod, and plays the role of transmitting torque, connecting upper and lower components, and conveying high-pressure air. The outer drill rod 1 mainly reduces the gap between the drill rod and the hole wall, adjusts the outer diameter, and makes slag discharge smoother.

[0025] The outer drill rod 1 is coaxially mounted on the outside of the inner drill rod 2, and the outer drill rod 1 and the inner drill rod 2 are circumferentially limited by a hexagonal limiter. During normal use, the male joint of the drill rod body faces upward and the female joint faces downward. After the adjacent drill rod bodies are connected end to end, the outer drill rod 1 of the next drill rod body is axially limited by the female joint of the previous drill rod body.

[0026] The outer drill rod 1 is provided with multiple models, so that the outer drill rod 1 of suitable diameter can be selected according to the hole diameter to be drilled. In this way, an inner drill rod 2 of one size can be matched with outer drill rods 1 of multiple sizes, which can be switched according to the hole diameter to be constructed, greatly saving costs.

[0027] The inner drill pipe 2 includes a hexagonal male joint 22, a pipe body 21 and a hexagonal female joint 23. The hexagonal male joint 22 matches the hexagonal female joint 23. The two ends of the pipe body 21 are coaxially welded with the hexagonal male joint 22 and the hexagonal female joint 23. The hexagonal male joint 22 and the hexagonal female joint 23 are both provided with a first pin hole 4 perpendicular to the axis. After the hexagonal male joint 22 is inserted into the hexagonal female joint 23, the hexagonal male joint 22 and the hexagonal female joint 23 are axially limited by the pin 3 inserted in the first pin hole 4.

[0028] The outer drill pipe 1 includes an upper support plate 12, an outer sleeve 11 and a lower support plate 13. The outer diameter of the outer sleeve 11 matches the inner diameter of the hole to be drilled. The upper support plate 12 is fixed to one end of the outer sleeve 11 close to the hexagonal male joint 22, and the lower support plate 13 is fixed to one end close to the hexagonal female joint 23. The outer sleeve 11 is sleeved on the outside of the inner drill pipe 2 and supported and positioned on the inner drill pipe 2 by the upper support plate 12 and the lower support plate 13 on both sides. The hexagonal male joint 22 includes an insertion end for being inserted into the hexagonal female joint 23 and a connecting end for connecting the insertion end to the pipe body 21. An outer hexagon 221 is milled on the connecting end of the hexagonal male joint 22 near the joint between the connecting end and the insertion end. 2 forms a hexagonal stopper, and a convex ring with an outer diameter greater than the outer diameter of the hexagonal female joint 23 is provided on the outer wall of the hexagonal female joint 23 and at one end away from the tube body 21, and the convex ring forms a step on the outer wall of the hexagonal female joint 23. The upper support plate 12 and the lower support plate 13 are both annular plates, and the position of the upper support plate 12 corresponds to the position of the outer hexagonal 221 on the hexagonal male joint 22. The middle part of the upper support plate 12 is provided with an inner hexagonal hole matching the size of the outer hexagonal 221, and the inner diameter of the lower support plate 13 matches the outer diameter of the hexagonal female joint 23. The axial length of the outer sleeve 11 matches the axial distance from the outer hexagonal 221 on the hexagonal male joint 22 to the end of the hexagonal female joint 23;

[0029] After the outer drill rod 1 is sleeved on the inner drill rod 2, the inner hexagonal clamp of the upper support plate 12 is connected to the outer hexagonal clamp 221 of the hexagonal male joint 22, so that the outer drill rod 1 and the inner drill rod 2 are linked to achieve simultaneous rotation; the lower support plate 13 is sleeved on the outside of the hexagonal female joint 23, and the lower support plate 13 is close to the step, and the step acts as a protective device to prevent the outer drill rod 1 from falling off; after the hexagonal female joint 23 of the upper drill rod body is connected to the hexagonal male joint 22 of the next drill rod body, the end of the hexagonal female joint 23 of the upper drill rod body will be pressed on the upper support plate 12 of the next drill rod body, thereby limiting the up and down movement of the outer drill rod.

[0030] Furthermore, two lower support plates 13 arranged parallel to each other are provided on the outer drill rod 1, and the outer drill rod 1 is supported on the hexagonal female joint 23 through the two lower support plates 13. A second pin hole is provided on the outer sleeve 11 of the outer drill rod 1 and between adjacent lower support plates 13, and the second pin hole corresponds to the position of the first pin hole 4. After the adjacent drill rod bodies are connected, the pin 3 is passed through the second pin hole and the first pin hole 4, and the pin 3 is passed out from the second pin hole on the other side and the pin 3 is axially limited by the cotter pin 31; an inwardly concave pin groove 14 is provided on the outer sleeve 11 of the outer drill rod 1 at the position of the second pin hole, and the pin groove 14 prevents the two ends of the pin 3 from extending out of the outer sleeve 11.

[0031] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A drill pipe with a variable outer diameter, characterized in that: The utility model comprises a drill rod body, wherein the drill rod body comprises an inner drill rod and an outer drill rod matching the inner diameter of the borehole, the outer drill rod is coaxially sleeved on the outside of the inner drill rod, and the outer drill rod and the inner drill rod are circumferentially limited by a hexagonal limiter, so that the outer drill rod and the inner drill rod are linked together. When in use, the male joint of the drill rod body faces upwards and the female joint faces downwards. After the adjacent drill rod bodies are connected end to end, the outer drill rod of the next drill rod body is axially limited by the female joint of the previous drill rod body.

2. The drill pipe with variable outer diameter according to claim 1, characterized in that: The inner drill pipe includes a hexagonal male joint, a pipe body and a hexagonal female joint. The hexagonal male joint matches the hexagonal female joint. The two ends of the pipe body are coaxially welded with the hexagonal male joint and the hexagonal female joint. The hexagonal male joint and the hexagonal female joint are both provided with a first pin hole perpendicular to the axis. After the hexagonal male joint is inserted into the hexagonal female joint, the hexagonal male joint and the hexagonal female joint are axially limited by a pin inserted in the first pin hole.

3. The drill pipe with variable outer diameter according to claim 2, characterized in that: The outer drill pipe includes an upper support plate, an outer sleeve and a lower support plate. The outer diameter of the outer sleeve matches the inner diameter of the hole to be drilled. The upper support plate is fixed to one end of the outer sleeve close to the hexagonal male joint, and the lower support plate is fixed to one end close to the hexagonal female joint. The outer sleeve is sleeved on the outside of the inner drill pipe and is supported and positioned on the inner drill pipe by the upper support plate and the lower support plate on both sides.

4. The drill pipe with variable outer diameter according to claim 3, characterized in that: The hexagonal male connector includes an insertion end for being inserted into the hexagonal female connector and a connecting end for connecting the insertion end to the pipe body. An outer hexagon is milled on the connecting end of the hexagonal male connector near the joint between the connecting end and the insertion end. The outer hexagon on the hexagonal male connector forms the hexagonal limiter. The upper support plate is an annular plate. The upper support plate corresponds to the position of the outer hexagon. An inner hexagon hole matching the size of the outer hexagon is provided in the middle of the upper support plate. After the outer drill rod is mounted on the inner drill rod, the upper support plate is clamped on the outer hexagon of the hexagonal male connector through the inner hexagon hole.

5. The drill rod with variable outer diameter according to claim 3 or 4, characterized in that: A convex ring with an outer diameter greater than the outer diameter of the hexagonal female connector is provided on the outer wall of the hexagonal female connector and at one end away from the tube body. The convex ring forms a step on the outer wall of the hexagonal female connector. The lower support plate is an annular plate, and the inner diameter of the lower support plate matches the outer diameter of the hexagonal female connector.

6. The drill pipe with variable outer diameter according to claim 5, characterized in that: The axial length of the outer sleeve matches the axial distance from the outer hexagon to the end of the hexagonal female connector.

7. The drill pipe with variable outer diameter according to claim 5, characterized in that: Two lower support plates arranged parallel to each other are provided on the outer drill rod, and the outer drill rod is supported on the hexagonal female joint through the two lower support plates. A second pin hole is provided on the outer sleeve and between adjacent lower support plates, and the second pin hole corresponds to the position of the first pin hole. After the adjacent drill rod bodies are connected, the pin passes through the second pin hole and the first pin hole, and the pin is axially limited in the second pin hole and the first pin hole by the cotter pin, so that the outer sleeve, the hexagonal male joint and the hexagonal female joint are axially locked.

8. The drill pipe with variable outer diameter according to claim 7, characterized in that: The outer sleeve is provided with a pin groove at the position of the second pin hole to prevent the two ends of the plug pin from extending out of the outer sleeve.

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