CN210509066U - Special high-strength raise boring machine drill rod for construction of mine deep well - Google Patents
Special high-strength raise boring machine drill rod for construction of mine deep well Download PDFInfo
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- CN210509066U CN210509066U CN201920814867.9U CN201920814867U CN210509066U CN 210509066 U CN210509066 U CN 210509066U CN 201920814867 U CN201920814867 U CN 201920814867U CN 210509066 U CN210509066 U CN 210509066U
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Abstract
The utility model discloses a special high strength raise boring machine drilling rod of mine deep well construction, including hollow drilling rod body, the both ends of drilling rod body are provided with the male joint and the female joint of mutual matching, the middle part of male joint and female joint all is equipped with the centre bore, be provided with chamfer and chamfer on the terminal surface of male joint and be located centre bore terminal surface all around, the surface of drilling rod body is equipped with between two square bolts that scale mark and this scale mark are located the drilling rod body, the screw thread of the male joint surface of drilling rod body adopts oblique trapezoidal taper thread profile. The utility model discloses can bear big axial tension and moment of torsion, and mechanical properties is high.
Description
Technical Field
The utility model relates to a raise boring machine, concretely relates to special high strength raise boring machine drilling rod of mine deep well construction.
Background
Drilling tools such as drill rods, short-circuit drill rods, threaded joints, stable drill rods and the like are widely used in industrial and mining drilling machines such as raise boring machines, full hydraulic drilling machines, oil drilling machines and the like, and the design of the drilling tools must involve the technical problems of selection of drilling tool materials, selection of connecting thread tooth forms, selection of taper thread tooth form cone angles and the like.
With the development of coal mining depth to deep and the improvement of coal mining construction process, the construction of underground extension mineshafts and ground ventilation mineshafts is more and more, and the construction depth of a raise boring machine is more and more, so that the stress of a drilling machine drilling tool, especially a drilling rod is more and more, and the drilling rod is frequently broken and broken. Therefore, how to design the drill rod and select the material of the drill rod is very important in the design of the drilling machine with larger construction depth.
The raise boring drill mainly includes: tricone bit, reamer bit (including hobbing cutter, blade holder, reamer bit body, blade holder, etc.), short-circuit drill rod, ordinary drill rod, stable drill rod (divided into straight edge type and spiral edge type), short-circuit drill rod, lifting nut, lifting screw rod, etc. The tricone bit, the reaming bit and the short-circuit drill rod are all used at the bottommost part of the drilling tool, so that the borne lifting force is the smallest, and the adopted drilling tool materials can be slightly inferior. The common drill rod and the stable drill rod not only bear the pulling force and the torque required by drilling, reaming and rock breaking, but also bear the additional pulling force generated by the weight of all drilling tools, and the additional pulling force generated by the weight of the drilling tools possibly exceeds the pulling force required by rock breaking during deep well construction, so the common drill rod and the stable drill rod need to be paid particular attention to structural design, threaded connection form selection and material selection.
The existing threads can be roughly classified into triangular threads, rectangular threads, trapezoidal threads, inclined trapezoidal threads (or zigzag threads) and the like according to the tooth shapes, and can be classified into straight threads and tapered threads according to the axial shapes. Threaded couplings are the most common form of mechanical transmission and are of particular importance. The threaded connection can be used both for mechanical connection and for mechanical transmission. When the screw thread type is used for mechanical transmission, rectangular screw threads or trapezoidal screw threads are mostly adopted, and a jack, a machine tool lead screw and the like are common; the most common form of thread used for coupling between parts is a triangular thread. In machines of the drilling machine type, the form of the threaded coupling is particularly important. When the drilling machine works, the thread connection is used for transmitting the torque for cutting and crushing rock between the drilling machine and the drill bit and transmitting the push-pull force of the drilling machine, and the connecting piece is a drill rod.
At present, most of the threads of the drill rod of the geological drilling machine for small-sized exploration mines in China basically adopt rectangular threads, while the threads of the drill rod of large-sized drilling machines such as oil drilling machines and raise boring machines adopt tapered triangular threads, and most of the threads adopt API petroleum regular-buckling or through-hole buckling tapered triangular threads. When the axial tension is small, the raise boring machine basically adopts API petroleum normal thread. When the raise boring machine is used for deep well construction, the axial tension borne by the drill rod is large, if API petroleum regular-buckling conical triangular threads are adopted, the thread strength is weak, and the drill rod thread breakage accident often occurs when the large raise boring machine is used for constructing a deep raise.
The selection of materials is of great importance in the design of drilling tools, especially in the occasions with large drilling depth and large torque, such as improper material selection, which often causes the drilling tool to twist off or break. At present, in raise boring machines produced in China, a plurality of manufacturers mostly adopt 35CrMoA materials to manufacture drilling tools such as drill rods and the like, and the materials have the advantages of moderate tensile strength, wherein the tensile strength sigma b of a pipe core is more than or equal to 880 MPa when the diameter of a section is 200-300 mm and the hardening and tempering hardness is HB 280-320; the yield strength sigma s is more than or equal to 700 MPa; the elongation delta is more than or equal to 12 percent; the impact toughness is more than or equal to 54J/cm 2. The advantage of this material is that it is cheap, but has relatively low strength.
Some drilling tools of domestic raise boring machines and petroleum drilling machines also adopt 40CrMnMo or 4145H materials, and the mechanical properties of the materials after quenching and tempering are HB 280-320: the tensile strength sigma b is more than or equal to 950 MPa; the yield strength sigma h is more than or equal to 800 MPa; the elongation delta is more than or equal to 15 percent; the impact toughness is more than or equal to 70J/cm 2. The comprehensive mechanical property of the material is slightly higher than that of 35 CrMoA.
Therefore, in the design of a drilling machine special for mine deep well construction, how to provide a proper drill rod structure, select a proper threaded connection form and select a proper drill rod material so that the drill rod has high comprehensive mechanical performance and can bear large axial tension and torque is a problem to be solved urgently at present.
Disclosure of Invention
The utility model aims to solve the technical problem that not enough to above-mentioned prior art provides a special high strength raise boring machine drilling rod of mine deep well construction, this special high strength raise boring machine drilling rod of mine deep well construction can bear big axial tension and moment of torsion, and mechanical properties is high.
In order to realize the technical purpose, the utility model discloses the technical scheme who takes does:
the utility model provides a special high strength raise boring machine drilling rod of mine deep well construction, includes hollow drilling rod body, the both ends of drilling rod body are provided with male joint and the female joint of mutual matching, the middle part of male joint and female joint all is equipped with the centre bore, be provided with chamfer and chamfer on the terminal surface of male joint and be located centre bore terminal surface all around, the surface of drilling rod body is equipped with between two square bolts that scale mark and this scale mark are located the drilling rod body, the screw thread of the male joint surface of drilling rod body adopts oblique trapezoidal taper thread profile.
As a further improved technical scheme of the utility model, the surface of drilling rod body is equipped with two rings of scale mark and two rings of scale mark of mutual parallel arrangement and all is located between two square bolts.
As a further improved technical scheme of the utility model, the scale mark is the annular.
As a further improved technical scheme of the utility model, the centre bore aperture at the position between the pin joint of drilling rod body to the square bolt is 60mm to 80 mm.
As a further improved technical scheme of the utility model, be provided with the toper chamfer that is not less than 25mm 60 degrees on the terminal surface of male joint.
As the further improved technical proposal of the utility model, the material of the drill rod body adopts 4330 alloy steel or 40CrNiMoA material.
The utility model has the advantages that:
(1) the utility model adds two scale marks between two square bolts of high-strength raise boring machine drill rod, constructors can observe the scale marks to control the raising speed of the raise boring machine power head, which can effectively prevent the over-fast raising speed of the boring machine when the drill rod is removed in the raise boring machine construction from causing the engagement of an upper holding wrench (an upper chuck) arranged on the power head not to fall off, or the over-slow raising speed of the boring machine from causing the thread burning caused by the over-tight pressing of a female buckle and a male buckle of the drill rod between the next two drill rods; the drill rod can be conveniently detached during the construction of the raise boring machine.
(2) The utility model discloses the centre bore aperture of drilling rod is 60mm to 80mm, has reduced drilling rod center scum liquid aperture (centre bore aperture promptly) to make the drilling rod increase of most dangerous cross sectional area (the most dangerous cross section is in the root position of male joint), effectively improved the required pulling force of carrying of the special high strength raise boring machine drilling rod of mine deep well construction, can bear big axial tension and moment of torsion.
(3) The utility model discloses the drilling rod adopts trapezoidal taper thread profile to one side, and the screw thread intensity of trapezoidal taper thread profile to one side is high, and the moment of torsion of transmission is big, and can bear great axial tension, appears drilling rod screw thread fracture when effectively preventing the construction.
(4) The utility model discloses the public joint tip of special high strength raise boring machine drilling rod of mine deep well construction has set up the toper chamfer that is not less than 25mm 60 degrees to effectively prevent to block up the jam of drilling rod because of the silt deposit when the raise boring machine is under construction.
(5) The utility model discloses the drilling rod body adopts high mechanical properties's drilling rod special material, 4330 alloy steel or 40CrNiMoA material, high-quality forging high alloy steel promptly, and mechanical properties is high, has improved raise the comprehensive mechanical properties of raise boring machine.
Drawings
Fig. 1 is a schematic structural diagram of the present embodiment.
Fig. 2 is a cross-sectional view of C-C in fig. 1.
FIG. 3 is an enlarged view of a portion of I in FIG. 1.
Fig. 4 is a partial enlarged view of ii in fig. 1.
FIG. 5 is an enlarged view of a portion of III in FIG. 1.
Detailed Description
The following further description of embodiments of the present invention is made with reference to fig. 1 to 5:
the embodiment provides a special high strength raise boring machine drilling rod of mine deep well construction, and the structure is as shown in figure 1, including hollow drilling rod body, drilling rod body both ends are provided with male joint 1 and female joint 2 that match each other, and the middle part of male joint 1 and female joint 2 all is equipped with centre bore 3.
The outer surface of the drill rod body of this embodiment is provided with two circles of scale marks 6 which are arranged in parallel, and the two circles of scale marks 6 are located between the two square bolts 5 on the drill rod body, and the scale marks 6 of this embodiment are annular grooves, as shown in fig. 5. An operator can observe the scale marks 6 on the drill rods to control the rising speed of the power head of the raise boring machine, so that the situation that when the drill rods are dismantled in the raise boring machine construction, the rising speed of the drill machine is too high, an upper holding wrench (an upper chuck) arranged on the power head is not meshed in place and falls off, or the situation that the rising speed of the drill machine is too low, a female buckle and a male buckle of the drill rods between the two next drill rods are pressed too tightly, and thread burning is caused can be effectively prevented.
The aperture of a central hole 3 (shown in figure 1 or figure 2) between the left end part of a male joint 1 and the right end part of a square bolt 5 of the drill rod of the embodiment is designed to be 60mm to 80mm, the aperture of a deslagging liquid in the center of the drill rod is reduced as much as possible (the aperture is not smaller than the diameter required by the flow of a flushing liquid and is generally not smaller than 50 mm), so that the area of the most dangerous section of the drill rod (the most dangerous section of a raise boring machine is arranged at the root part of the male joint 1 of the drill rod) is increased, and the pulling force required by the drill rod of the high-strength raise boring machine for deep.
As shown in fig. 1, a circle of chamfer 4 is additionally arranged on the end face of the male joint 1 of the drill rod of the embodiment, and the chamfer 4 is positioned on the end faces around the central hole 3 (namely the chamfer 4 at the central hole 3 on the left end face in fig. 1), so that the drill rod is effectively prevented from being blocked due to sediment deposition during the construction of the raise-boring machine.
As shown in fig. 3 and 4, the thread on the outer surface of the male connector 1 and the thread on the inner surface of the female connector 2 in the present embodiment have matching tapered thread profiles 7. The inclined trapezoidal thread profile 7 has a much stronger ability to bear axial tension than the triangular thread, so that the inclined trapezoidal thread profile 7 should be widely used in drilling tools such as drill rods used in construction of deep wells by raise boring machines.
The material adopted by the drill rod of the foreign drilling machine is subjected to chemical composition analysis and mechanical property analysis for many times, and researches show that the material adopted by the foreign high-strength drilling tool contains higher components of Ni and Mo, so that the hardenability and the elongation of the material are effectively increased. The mechanical properties of the large-diameter drill rod (not less than 250 mm) with the material hardening and tempering hardness of HB320 can reach: the tensile strength sigma b is more than or equal to 1100 Mpa; the yield strength sigma s is more than or equal to 900 Mpa; the elongation delta is more than or equal to 17 percent; the shrinkage delta is more than or equal to 55.4 percent; the impact toughness is more than or equal to 100J/cm 2. These data indicate that the mechanical properties of the materials used for the drill rod of the offshore raise-boring machine are much better than those of 35CrMoA, 40CrMnMo or 4145H, and the drilling machine is very suitable for the requirements of deep well construction of the raise-boring machine, and the rated construction depth of the drilling machine of Robings company in America is as high as 600 meters, which is incomparable with the existing raise-boring machines in China. The chemical components of the material for constructing the large-diameter raise boring machine drill rod of the deep well by analyzing are as follows in the following table 1:
table 1: chemical composition analysis of drilling tool material
| Name of Material | C | Si | Mn | P | S | Cr | Ni | Mo | Cu |
| Foreign drill rod sample | 0.37～0.45 | 0.22～0.35 | 0.61～0.72 | 0.011～0.025 | 0.011～0.025 | 0.80～1.20 | 1.80～2.10 | 0.23～0.45 | 0.12～0.16 |
| Domestic 40CrNiMoA | 0.37～0.44 | 0.17～0.37 | 0.50～0.80 | 0.60～0.90 | 1.25～1.75 | 0.15～0.25 |
Research shows that the chemical components of foreign drill rods are very close to those of domestic 40CrNiMoA materials, so that when the construction depth of a raise boring machine is large, 40CrNiMoA is adopted as the material of the drill rod body of the embodiment and is more suitable. Of course, the material of the drill rod body of the embodiment can also adopt 4330 alloy steel, and the comprehensive mechanical property of the material is much better than that of 35CrMoA, 40CrMnMo or 4145H.
The special high-strength raise boring machine drill rod for mine deep well construction has the following innovation points and advantages:
(1) two scale marks 6 are additionally arranged between two square bolts 5 of a drill rod of the high-strength raise boring machine, so that the drill rod can be conveniently dismounted in the raise boring machine construction.
(2) The aperture of the slag discharging liquid at the center of the drill rod is reduced, so that the most dangerous section area of the drill rod is increased, and the pulling force required by the high-strength raise drill rod special for the construction of the mine deep well is effectively improved.
(3) A large chamfer 4 is additionally arranged on the male thread section of a high-strength raise boring machine drill rod special for mine deep well construction, so that the drill rod is effectively prevented from being blocked due to sediment deposition during the raise boring machine construction.
(4) The drill rod with the inclined trapezoidal taper thread profile 7 is high in thread strength, large in transmitted torque, capable of bearing large axial tension and capable of effectively preventing drill rod thread fracture during construction.
(5) High-quality forged high-alloy steel is adopted, and the comprehensive mechanical property of the raise boring machine is improved.
In a word, the high-strength raise boring machine drill rod special for mine deep well construction can effectively improve the working efficiency, improve the safety and reliability of the raise boring machine construction, and has great promotion significance for mine safety production.
The protection scope of the present invention includes but is not limited to the above embodiments, the protection scope of the present invention is subject to the claims, and any replacement, deformation, and improvement that can be easily conceived by those skilled in the art made by the present technology all fall into the protection scope of the present invention.
Claims (6)
1. The utility model provides a special high strength raise boring machine drilling rod of mine deep well construction, includes hollow drilling rod body, its characterized in that, the both ends of drilling rod body are provided with male joint and the female joint of mutual matching, the middle part of male joint and female joint all is equipped with the centre bore, be provided with chamfer and chamfer on the terminal surface of male joint and be located centre bore terminal surface all around, the surface of drilling rod body is equipped with between two square bolts that scale mark and this scale mark are located the drilling rod body, the screw thread of the male joint surface of drilling rod body adopts oblique trapezoidal awl screw thread profile.
2. The special high-strength raise boring machine drill rod for mine deep well construction according to claim 1, wherein the outer surface of the drill rod body is provided with two circles of scale marks which are arranged in parallel, and the two circles of scale marks are located between the two square bolts.
3. The special high-strength raise boring machine drill rod for mine deep well construction according to claim 2, characterized in that the scale mark is a ring groove.
4. The special high-strength raise boring machine drill rod for mine deep well construction according to claim 1, wherein the diameter of the central hole between the male joint and the square bolt of the drill rod body is 60mm to 80 mm.
5. The special high-strength raise boring machine drill rod for mine deep well construction according to claim 1, characterized in that a conical chamfer of not less than 25mm x 60 degrees is arranged on the end surface of the male joint.
6. The special high-strength raise boring machine drill rod for mine deep well construction according to claim 1, characterized in that the material of the drill rod body is 4330 alloy steel or 40CrNiMoA material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920814867.9U CN210509066U (en) | 2019-05-31 | 2019-05-31 | Special high-strength raise boring machine drill rod for construction of mine deep well |
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| CN201920814867.9U CN210509066U (en) | 2019-05-31 | 2019-05-31 | Special high-strength raise boring machine drill rod for construction of mine deep well |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233206A (en) * | 2021-12-03 | 2022-03-25 | 江苏和信石油机械有限公司 | Raise boring machine drilling rod structure for water and electricity system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233206A (en) * | 2021-12-03 | 2022-03-25 | 江苏和信石油机械有限公司 | Raise boring machine drilling rod structure for water and electricity system |
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