CN215979235U

CN215979235U - Combined large-diameter raise boring rod and raise boring machine

Info

Publication number: CN215979235U
Application number: CN202122586735.5U
Authority: CN
Inventors: 唐安平; 尹千才; 谭崎文
Original assignee: Hunan Chuangyuan High Tech Machinery Co ltd
Current assignee: Hunan Chuangyuan High Tech Machinery Co ltd
Priority date: 2021-10-27
Filing date: 2021-10-27
Publication date: 2022-03-08
Anticipated expiration: 2031-10-27

Abstract

The utility model provides a combined large-diameter raise boring rod and a raise boring machine, wherein the combined large-diameter raise boring rod comprises a tubular threaded joint and a tubular boring rod, wherein the tubular threaded joint is in interference connection with the tubular boring rod through a taper thread pair, and a fixing structure adhesive is arranged at the taper thread pair; the tubular threaded joint comprises a first tubular body machined from a thick-walled pipe body material; the tubular drill rod comprises a second tubular body, the second tubular body is made of a thin-wall pipe body material in a machining mode, and the inner diameter of the second tubular body is larger than that of the first tubular body; the utility model can bear larger axial tension and torque and reduce the cost of the drill rod.

Description

Combined large-diameter raise boring rod and raise boring machine

Technical Field

The utility model relates to the technical field of raise boring machine drill rods, in particular to a combined large-diameter raise boring machine drill rod and a raise boring machine.

Background

At present, the technology of the large-diameter raise boring machine in the world is mainly mastered in foreign enterprises, the raise boring machine produced in China mainly takes middle and small sizes as main materials, and a drill rod suitable for the large-diameter raise boring machine is one of key technologies of a clamping neck. Foreign large-diameter raise boring machine drilling rod usually adopts the cutting process after the blank is whole forged, but because the drilling rod centre bore size is inconsistent, forges the degree of difficulty very big, has sufficient flexibility for guaranteeing the drilling rod, often need get rid of more material. The drill rod produced by the process has high material cost and processing cost, so that the total production cost of the drill rod is high, and the equipment cost of customers is increased.

In recent years, some domestic enterprises have started studying large-diameter drill pipes, such as: the patent application No. 202022370447.1 discloses a raise boring machine drilling rod, including the body of rod, still including setting up the external screw thread in body of rod one end, the other end of the body of rod is provided with the internal thread, and the external screw thread is oblique trapezoidal taper thread with the internal thread, and this utility model adopts oblique trapezoidal taper threaded connection structure, can improve drilling rod threaded connection department's anti bending ability, anti shear capacity, but whole drilling rod adopts the structure of integral type, for guaranteeing that the drilling rod has sufficient flexibility on the whole, still need get rid of more material to the processing cost has been increased.

Therefore, there is a need for a combined large-diameter raise boring rod and raise boring machine that can withstand large axial tension and torque and reduce the cost of the boring rod.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a combined large-diameter raise boring rod and a raise boring machine, which can bear large axial tension and torque and reduce the cost of the boring rod.

In order to achieve the purpose, the utility model provides a combined large-diameter raise boring rod, which comprises a tubular threaded joint and a tubular boring rod, wherein the tubular threaded joint is in interference connection with the tubular boring rod through a taper thread pair, and a fixing structure glue is arranged at the taper thread pair; the tubular threaded joint comprises a first tubular body machined from a tubular body material having a wall thickness of T1; the tubular drill rod comprises a second tubular body which is made of a tubular body material with a wall thickness of T2, T1> T2, and the outer diameter of the second tubular body is equal to the outer diameter of the first tubular body.

As a further improvement of the scheme, the length of the tubular drill rod is greater than that of the tubular threaded joint.

As a further improvement of the above solution, the tapered threads of the tapered thread pair are at least double-start tapered threads.

As a further improvement of the above scheme, the tubular threaded joint further includes first end units disposed at both ends of the first tubular body, the first end units are provided with tapered threads, at least one of the first end units is an outer butt joint end, the outer butt joint end includes a first butt shoulder, an outer tapered thread and a second butt shoulder which are sequentially disposed, and the first butt shoulder and the second butt shoulder are used for abutting against a top contact surface of a raise boring machine power head assembled with the first end unit.

As a further improvement of the above solution, the tubular drill rod further comprises a second end unit arranged at both ends of the second tubular body, the second end unit being provided with a conical thread complementary to the first end unit.

As a further improvement of the above scheme, the first end units are all external butt ends, on which external tapered threads are arranged, and the second end units are all internal butt ends, on which corresponding internal tapered threads are arranged.

As a further improvement of the above aspect, the inner butt end is provided with a third abutment shoulder for abutting against the second abutment shoulder of the tubular threaded joint fitted with the second end unit.

As a further improvement of the above, the tapered threads are at least double-start tapered threads.

As a further improvement of the above scheme, a chamfer surface is arranged between the first abutting shoulder and the small end of the outer conical thread, a stress release area is arranged between the second abutting shoulder and the large end of the outer conical thread, and the stress release area comprises a tool retracting inclined surface, a transition inclined surface and an arc-shaped surface which is concave in the second abutting shoulder which are sequentially connected in sequence.

As a further improvement of the above, the root of the external taper thread terminates in the relief rake face.

As a further improvement of the scheme, a fillet is arranged between the tool retracting inclined plane and the transition inclined plane.

As a further improvement of the scheme, the maximum outer diameters of the transition inclined surface and the arc-shaped surface are smaller than the thread root diameter of the taper thread.

As a further improvement of the scheme, the taper of the taper thread is 1:8, and the tooth form angle is 60 degrees; the tapered thread has a load flank angle of 15 ° and a stab flank angle of 45 °.

As a further improvement of the scheme, the pitch of the taper thread is 12.7mm, and the lead is 50.8 mm.

The utility model also provides a raise boring machine which comprises the combined large-diameter raise boring rod, and the combined large-diameter raise boring rod is arranged in the power head of the raise boring machine.

Due to the adoption of the technical scheme, the utility model has the beneficial effects that:

1. the utility model provides a combined large-diameter raise drill rod which comprises a tubular threaded joint and a tubular drill rod, wherein the tubular threaded joint is in interference connection with the tubular drill rod through a taper thread pair, and a fixing structure adhesive is arranged at the taper thread pair; the tubular threaded joint comprises a first tubular body machined from a thick-walled pipe body material; the tubular drill rod comprises a second tubular body, the second tubular body is made of a thin-wall pipe body material in a machining mode, and the inner diameter of the second tubular body is larger than that of the first tubular body; according to the utility model, the traditional integrated raise boring rod is formed by combining a tubular threaded joint and a tubular boring rod, the tubular threaded joint and the tubular boring rod are in interference connection through a taper thread pair, and a fixing structure adhesive is arranged at the taper thread pair to ensure stable non-detachable connection between the tubular threaded joint and the tubular boring rod; meanwhile, the tubular threaded joint is made of a thick-wall pipe body material so as to improve the strength of the threaded connection part, and the tubular drill rod is made of a thin-wall pipe body material, so that the processing cost and the material cost of the drill rod can be effectively saved, and the cost of the whole drill rod is reduced; on the other hand, due to the thin wall of the tubular drill rod, the flexibility of the drill rod can be increased, and the drill rod is used for releasing bending load caused by bending of a shaft during operation.

2. The utility model provides a combined large-diameter raise boring rod, the tubular threaded joint also comprises a first end unit arranged at two ends of the first tubular body, the first end part unit is provided with taper threads, at least one of the first end part units is an outer butt joint end, the outer butt joint end comprises a first butt joint shoulder, an outer taper thread and a second butt joint shoulder which are arranged in sequence, the first abutting shoulder and the second abutting shoulder are used for abutting against a top contact surface of the power head of the raise boring machine assembled with the first end unit, a stress release area is arranged between the second abutting shoulder and the large end of the outer conical thread, and the stress release area comprises a tool withdrawal inclined plane, a transition inclined plane and an arc-shaped plane which is concave to the second abutting shoulder which are sequentially connected in sequence; compared with the traditional top contact mode, the drill rod has the advantages that the stress release area is arranged and comprises the arc-shaped surface which is concave to the second abutting shoulder, so that the contact area between the second abutting shoulder and the top contact surface of the power head is reduced, and when the drill rod bears large axial force, the drill rod has high elastic deformation to compensate the distance error between the two shoulders and balance the load between the two shoulders.

3. The combined large-diameter raise boring rod provided by the utility model has the advantages that the tapered threads are at least double-head tapered threads, and in certain preferred embodiments, the double-head tapered threads are adopted for connecting the tapered threads, so that the helix angle is increased, the helix lifting force generated by torque is reduced, and the stress state of a tapered thread pair is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts;

FIG. 1 is a schematic cross-sectional view of a modular large diameter raise boring bar according to the present disclosure;

FIG. 2 is a schematic cross-sectional view of a tubular threaded joint according to the present disclosure

FIG. 3 is an enlarged view of a portion of FIG. 2 from direction I;

FIG. 4 is a schematic view, partially in section, of a combination large diameter raise boring rod mounted to a power head of a raise boring machine in accordance with the present invention;

FIG. 5 is an enlarged view of a portion II of FIG. 4;

reference numerals:

1. a tubular threaded joint; 11. a first tubular body; 12. a first end unit; 121. a first abutment shoulder; 122. external taper threads; 123. a second abutment shoulder; 124. chamfering; 125. a stress relief region; 126. a tool retracting inclined surface 127 and a transition inclined surface; 128. an arc-shaped surface;

2. a tubular drill rod; 21. a second tubular body; 22. a second end unit; 23. a third abutment shoulder; 01. raise boring machine unit head.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators such as the first, second, upper, lower, left, right, front and rear … … in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture as shown in the drawings, and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model will be further described with reference to the following figures:

example 1:

referring to fig. 1-3, the utility model provides a combined large-diameter raise boring rod, which comprises a tubular threaded joint 1 and a tubular boring rod 2, wherein the tubular threaded joint 1 is in interference connection with the tubular boring rod 2 through a taper thread pair, the taper thread of the taper thread pair is at least a double-end taper thread, and a fixing structure glue is arranged at the taper thread pair; the tubular threaded joint 1 comprises a first tubular body 11, the first tubular body 11 being machined from a tubular body material having a wall thickness T1; the tubular drill rod 2 comprises a second tubular body 21, the second tubular body 21 is made of a tubular body material with a wall thickness of T1, T1> T2, and the outer diameter of the second tubular body 21 is equal to that of the first tubular body 11; the length of the tubular drill rod 2 is greater than the length of the tubular threaded joint 1. The traditional integrated raise boring rod is formed by combining a tubular threaded joint 1 and a tubular boring rod 2, the tubular threaded joint 1 and the tubular boring rod 2 are in interference connection through a taper thread pair, and a fixing structure adhesive is arranged at the taper thread pair to ensure stable non-detachable connection between the tubular threaded joint 1 and the tubular boring rod 2; meanwhile, the tubular threaded joint 1 is made of a thick-wall pipe body material so as to improve the strength of the threaded connection part, and the tubular drill rod 2 is made of a thin-wall pipe body material, so that the processing cost and the material cost of the drill rod can be effectively saved, and the cost of the whole drill rod is reduced; on the other hand, due to the thin wall of the tubular drill rod 2, the flexibility of the drill rod can be increased, and the drill rod is used for releasing bending load caused by bending of a shaft during operation.

As a preferred embodiment, the tubular threaded joint 1 further includes first end units 12 disposed at two ends of the first tubular body 11, tapered threads are disposed on the first end units 12, at least one of the first end units 12 is an outer butt end, the outer butt end includes a first butt shoulder 121, an outer tapered thread 122 and a second butt shoulder 123 disposed in sequence, and the first butt shoulder 121 and the second butt shoulder 123 are used for abutting against a top contact surface of a raise boring machine power head 01 assembled with the first end unit 12; a chamfer surface 124 is arranged between the first abutting shoulder 121 and the small end of the outer conical thread 122, a stress release area 125 is arranged between the second abutting shoulder 123 and the large end of the outer conical thread 122, and the stress release area 125 comprises a tool withdrawal inclined surface 126, a transition inclined surface 127 and an arc-shaped surface 128 which is concave to the second abutting shoulder 123 which are sequentially connected in sequence; the drill rod and the raise boring machine power head 01 are firmly connected through the arrangement of the two abutting shoulders; compared with the traditional top contact mode, the stress release area 125 is arranged, and the stress release area 125 comprises the arc-shaped surface 128 which is concave to the second abutting shoulder 123, so that the contact area between the second abutting shoulder 123 and the top contact surface of the power head is reduced, and when a drill rod bears a large axial force, the drill rod has high elastic deformation so as to compensate the distance error between the two shoulders and balance the load between the two shoulders.

As a preferred embodiment, the tubular drill rod 2 further includes second end units 22 disposed at two ends of the second tubular body 21, the second end units 22 are provided with tapered threads complementary to the first end units 12, in this embodiment, the second end units 22 are all internal butt ends, and are provided with corresponding internal tapered threads, correspondingly, the first end units 12 are all external butt ends, and are provided with external tapered threads 122, the internal butt ends are provided with third abutting shoulders 23, and are used for abutting against the second abutting shoulders 123 of the tubular threaded joint 1 assembled with the second end units 22, and the first abutting shoulders 121 of the tubular threaded joint 1 assembled with the second end units 22 are free ends, so as to eliminate adverse effects caused by assembly errors during operation of the drill rod.

As a preferred embodiment, the tapered threads are at least double-start tapered threads, in this embodiment, the tapered threads are four-start tapered threads, and the arrangement of the multiple-start tapered threads increases the helix angle of the connection of the thread pair in the present invention, so as to reduce the helical lift force generated by the torque, and further improve the stress state of the tapered thread pair.

In a preferred embodiment, the thread root of the external taper thread 122 terminates in the relief inclined plane 126, and the arrangement is such that the thread ending part of the taper thread is controlled to the relief inclined plane 126, so that the thread root of the ending part does not cut the fillet and the transition inclined plane 127 which start the gradual transition of the section, thereby reducing the stress concentration and greatly reducing the breakage of the drill rod at the thread connection.

In a preferred embodiment, a fillet is arranged between the relief inclined surface 126 and the transition inclined surface 127, and the fillet is arranged so that the ending part of the thread can smoothly transition to the second abutting shoulder 123, thereby reducing the stress concentration; and because the root of the outer tapered thread 122 terminates within the relief rake surface 126, in conventional implementations, the root of the ending portion of the thread is extended onto the radius, so that the force on the tapered thread is spread to the radius, increasing the stress concentration there.

In a preferred embodiment, the maximum outer diameters of the inclined transitional surface 127 and the arc-shaped surface 128 are smaller than the thread root diameter of the tapered thread, and the arrangement is such that a stress relief area 125 is formed between the second abutment shoulder 123 of the threaded joint and the top contact surface of the raise boring unit head 01.

In a preferred embodiment, the root of the tapered thread and the outer surface of the stress relief region 125 are formed by a rolling process, which can improve the surface stress state of the root and the outer surface of the stress relief region 125, thereby improving the fatigue resistance.

As a further improvement of the scheme, the taper of the taper thread is 1:8, the tooth form angle is 60 degrees, and the bearing degree of axial tension is improved by improving the taper; the tapered threads having a load flank angle of 15 ° and a stab flank angle of 45 °; the pitch of the conical threads is 12.7mm, and the lead is 50.8 mm; the lead is increased, so that the helix angle is increased, and the torsion resistance is improved; by increasing the thread pitch, the shearing strength and the bending strength are enhanced, and the bearing capacity of axial tension is improved.

Example 2:

referring to fig. 4 and 5, the utility model further provides a raise boring machine, which comprises the combined large-diameter raise boring rod, and the combined large-diameter raise boring rod is arranged in the raise boring machine power head 01.

The foregoing is a detailed description of the utility model, and specific examples are used herein to explain the principles and implementations of the utility model, the above description being merely intended to facilitate an understanding of the principles and core concepts of the utility model. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. The combined large-diameter raise boring rod is characterized by comprising a tubular threaded joint and a tubular boring rod, wherein the tubular threaded joint is in interference connection with the tubular boring rod through a taper thread pair, and a fixing structure glue is arranged at the taper thread pair; the tubular threaded joint comprises a first tubular body machined from a tubular body material having a wall thickness of T1; the tubular drill rod comprises a second tubular body which is made of a tubular body material with a wall thickness of T2, T1> T2, and the outer diameter of the second tubular body is equal to the outer diameter of the first tubular body.

2. A modular large diameter raise boring rod according to claim 1, wherein the length of the tubular boring rod is greater than the length of the tubular threaded joint.

3. The combined large-diameter raise boring rod according to claim 1 or 2, wherein the tubular threaded joint further comprises first end units arranged at two ends of the first tubular body, the first end units are provided with taper threads, at least one of the first end units is an outer butt joint end, the outer butt joint end comprises a first butt shoulder, an outer taper thread and a second butt shoulder which are arranged in sequence, and the first butt shoulder and the second butt shoulder are used for butting against a butting face of a raise boring machine power head assembled with the first end unit.

4. A modular large diameter raise boring rod according to claim 3, further comprising a second end unit disposed at either end of the second tubular body, the second end unit being provided with a tapered thread complementary to the first end unit.

5. A modular large diameter raise boring rod according to claim 4, wherein the first end units are outer butt ends each having an outer tapered thread thereon; the second end units are all inner butt ends, and corresponding inner conical threads are arranged on the second end units.

6. A modular large diameter raise boring rod according to claim 5, wherein the inner butt end is provided with a third abutment shoulder for abutting against a second abutment shoulder of a tubular threaded joint to be fitted with the second end unit.

7. A modular large diameter raise boring rod according to claim 4, wherein the tapered thread is at least a double start tapered thread.

8. The combined large-diameter raise boring rod according to claim 3, wherein a chamfer surface is arranged between the first abutting shoulder and the small end of the outer conical thread, a stress relief area is arranged between the second abutting shoulder and the large end of the outer conical thread, and the stress relief area comprises a tool withdrawal inclined surface, a transition inclined surface and an arc-shaped surface which is concave to the second abutting shoulder which are sequentially connected in sequence.

9. A modular large diameter raise boring rod according to claim 8 wherein the root of the external tapered thread terminates in the relief rake surface.

10. Raise boring machine, characterized in that it comprises a combined large diameter raise boring rod according to any of claims 1-9, which is arranged in a raise boring machine power head.