CN217462060U - Anti-bending rock drilling tool, rock drill and rock drilling trolley - Google Patents

Abstract

The present disclosure relates to a rock drill of anti-breaking rock drilling tool and a rock drilling trolley. The anti-breaking rock drilling tool comprises a drill bit and a drill rod, wherein the drill bit comprises a head part used for mining engineering, one side far away from the head part is provided with a hollow structure, the hollow structure comprises an internal thread section and an internal transition section, and the drill rod comprises an external thread section and an external transition section; in the state that the drill rod and the drill bit are matched and screwed, the inner wall of the inner transition section and the outer wall of the outer transition section form a gap, and the included acute angle between the front end tangent plane of the inner transition section and the axis is smaller than the included acute angle between the tail end tangent plane of the inner transition section and the axis and/or the included acute angle between the front end tangent plane of the outer transition section and the axis is smaller than the included acute angle between the tail end tangent plane of the outer transition section and the axis.

Description

Anti-bending rock drilling tool, rock drill and rock drilling trolley

Technical Field

The present disclosure relates generally to the fields of water conservancy, hydropower, nuclear power, roads, traffic, mining, and the like, and more particularly to an anti-fracture rock drilling tool, a rock drill, and a rock drilling rig.

Background

Rock drills are tools used to directly mine rock material and drill blastholes into rock formations to deposit explosives to blast the rock and thereby complete the mine of rock material or other rock work. Furthermore, rock drills may also be used as breakers for breaking hard layers such as concrete. The rock drilling tool used by rock drill is generally called drill tool, the rock drilling tool is the most severe service condition and the shortest service life in all running machines, and the rock drilling tool bears various composite external loads such as torsion, bending, stretching, extrusion and the like besides high-frequency impact.

Under the normal working condition, the main cause of the failure of the drill tool is impact fatigue fracture, and through analysis, the main causes of the fracture are as follows: 1) because the tool withdrawal groove is formed at the ending part of the internal thread, the drill bit wall corresponding to the tool withdrawal groove is thinner and weaker in strength, and stress is usually concentrated at the intersection of the tool withdrawal groove and the threaded blind hole, so that drill bit breakage is easy to occur at the intersection of the threaded blind hole and the tool withdrawal groove. 2) Because the stress is mostly concentrated at the ending part of the external thread of the drill rod, the drill rod is easy to break at the ending part of the external thread when being subjected to the action of bending moment. The drill tool is frequently broken and fails, the service life of the drill tool is seriously shortened, a large amount of time is wasted, and the overall progress of the project is influenced.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect, the utility model aims at providing a reduce the contact stress between bore bit and drill rod, long service life, efficient, the difficult cracked anti rock drilling bore tool of rolling over, the rock drill and the drill jumbo of installing this rock drilling bore tool.

According to a first aspect of the disclosed embodiments, there is provided an anti-breaking rock drilling tool, comprising a bit and a drill rod, wherein the bit comprises a head for drilling, a hollow structure is arranged on one side far away from the head, the hollow structure comprises an internal thread section and an internal transition section, and the internal transition section is arranged on one side far away from the head of the internal thread section; the drill rod comprises an external thread section and an external transition section; the drill bit and the drill rod are connected in a threaded fit mode through an internal thread section and an external thread section, in the state that the drill rod and the drill bit are screwed in a matched mode, a gap is formed between the inner wall of the internal transition section and the outer wall of the external transition section, and the included acute angle between the front end tangent plane of the internal transition section and the axis is smaller than the included acute angle between the tail end tangent plane of the internal transition section and the axis and/or the included acute angle between the front end tangent plane of the external transition section and the axis is smaller than the included acute angle between the tail end tangent plane of the external transition section and the axis.

In one embodiment, the inner wall of the inner transition section and the outer wall of the outer transition section are circular arc surfaces or a plurality of continuous conical surfaces.

In one embodiment, both ends of each of the plurality of continuous conical surfaces are smoothly transited.

In an embodiment, the arc surface is a single-segment arc surface, a multi-segment continuous arc surface, or a discontinuous dispersion distribution arc surface.

In one embodiment, the acute angle is 0.5 ° to 15 °.

In an embodiment, the inner transition section length is no longer than the outer transition section length.

In one embodiment, the clearance between the bit and the drill rod is 0.3mm to 5 mm.

In one embodiment, a buffer material is filled in the gap between the bit and the drill rod.

According to a second aspect of an embodiment of the present disclosure there is provided a rock drilling machine comprising an anti-break rock drilling tool as described in any one of the preceding embodiments.

According to a third aspect of embodiments of the present disclosure there is provided a rock drilling rig comprising a rock drilling machine as described in any one of the previous embodiments.

The utility model discloses owing to adopted above-mentioned technical scheme, consequently have following advantage: the utility model provides an anti-bending rock drilling tool, in the state that the drill rod and the drill bit are matched and screwed, firstly, the inner wall of the inner transition section and the outer wall of the outer transition section have a clearance, thereby avoiding the direct contact between the drill rod and the drill bit, secondly, when the rock drilling tool works, the outer wall of the outer support section (outer transition section) of the drill rod is stressed to bend and deform to contact with the inner wall of the inner support section (inner transition section) of the drill bit, but through the optimization and improvement on the structures of the inner wall of the inner transition section and the outer wall of the outer transition section, better support and protection can be provided, so that the bending resistance of the whole rock drilling tool is obviously enhanced, the contact stress is obviously weakened, the impact force during contact is further effectively reduced, the fracture condition of the whole rock drilling tool is obviously improved, the probability of bending the drill rod is reduced, the service life of the drill rod is prolonged, the time cost and the economic cost for replacing the drill tool are saved, and the construction progress is greatly accelerated.

Drawings

The above and other objects, features and advantages of the embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:

fig. 1A shows a schematic structural diagram of a drill bit provided by an embodiment of the present invention.

Fig. 1B shows a schematic structural diagram of a drill rod provided by an embodiment of the present invention.

Fig. 2A shows a schematic structural diagram of a drill bit according to another embodiment of the present invention.

Fig. 2B shows a schematic structural diagram of a drill rod according to another embodiment of the present invention.

Fig. 3A shows a schematic structural diagram of a drill bit according to another embodiment of the present invention.

Fig. 3B shows a schematic structural diagram of a drill rod according to another embodiment of the present invention.

Fig. 4A shows a schematic structural diagram of a drill bit according to another embodiment of the present invention.

Fig. 4B shows a schematic structural diagram of a drill rod according to another embodiment of the present invention.

In the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

Detailed Description

The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments. It should be understood that these embodiments are given solely for the purpose of enabling those skilled in the art to better understand and thereby implement the present invention, and are not intended to limit the scope of the invention in any way.

It should be noted that although the terms "first", "second", etc. are used herein to describe various modules, steps, data, etc. of embodiments of the present invention, the terms "first", "second", etc. are used merely to distinguish between various modules, steps, data, etc. and do not indicate a particular order or degree of importance. Indeed, the terms "first," "second," and the like are fully interchangeable.

It should be noted that although expressions such as "front", "back", "left", "right", "top", "bottom", "outside", "inside" and the like are used herein to describe different directions or sides and the like of embodiments of the present invention, expressions such as "front", "back", "left", "right", "top", "bottom", "outside", "inside" and the like are merely for distinguishing between different directions or sides, and do not denote a particular outside or inside. Indeed, the terms "front," "back," "left," "right," "top," "bottom," "outer," "inner," and the like may, in some instances, be used interchangeably at all.

In the related art, the drill tool is mainly applied to a rock drill, and the rock drill generally comprises an impact mechanism, a drill rotating mechanism, a chip removal mechanism, a lubricating mechanism and the like; the drill tool generally comprises a drill rod, a drill bit, a connecting sleeve and a drill bit shank; the drill bit shank is generally provided with a spline and is used for being connected with a rotating sleeve of the rock drill, and the drill bit shank is generally inserted into the rotating sleeve of the rock drill, so that impact energy, rotary torque and flushing medium are transmitted to the drill rod and the drill bit through the spline; the drill rod is a hollow long rod, a hollow pipeline is used as a channel, holes are formed in the periphery of the drill rod tail and communicated with the drill rod, and water or a flushing liquid medium is introduced into the drill rod; the front section of the drill rod is connected with a drill bit, and the drill bit is provided with a water channel which is communicated with a channel of the drill rod and used for eliminating dust generated in the operation process; in the process of chiseling the rock wall, water or a flushing liquid medium passes through the drill rod from the drill shank and is finally sprayed out from a water channel of the drill bit, so that the temperature of the drill tool is reduced, and rock fragments, dust and the like generated by chiseling the rock wall are flushed outwards, and the smooth operation of rock drilling is ensured. The material of the drill bit is the basis for ensuring the quality of the drill bit, mainly comprises steel, hard alloy and other materials, and the front end of the drill bit is generally provided with a plurality of hard alloy blocks; the drill rod can be made of bainite steel, 30-35SiMnMoV alloy steel and the like, when the rock drill drills a rock wall, power is transmitted to the drill bit through the drill rod, and the power comprises drilling power in the axial direction of the drill rod and rotating power rotating along the axis of the drill rod. The pressure of the chiseling can be 10-30Mpa, the frequency can be more than or equal to 35Hz, and the rotating speed can be more than or equal to 150 r/min; in this process, the drill rod is subjected not only to the power output of the rock drill, but also to the reaction forces transmitted from the rock through the drill bit. The strength, surface stress, working pressure, quality and the like of the drill rod all affect the rock drilling effect and the service life; in some related technologies, the top end of a drill bit is columnar and annular, the outer diameter of the top end is larger than that of a drill rod, the diameter of a joint of the drill bit and the drill rod is changed greatly, the stress concentration phenomenon occurs at the joint of the drill bit and the drill rod, and the drill rod is easy to break at the stress concentration part of reducing during operation.

In order to solve the above problems, as shown in fig. 1A-4B, the utility model provides an anti-breaking rock drilling tool, which comprises a drill bit 1 and a drill rod 2, wherein the drill bit 1 comprises a head part for mining engineering, a hollow structure is arranged at one side far away from the head part, the hollow structure comprises an internal thread section 3 and an internal transition section 4, and the internal transition section 4 is arranged at one side far away from the head part of the internal thread section 3; the drill rod 2 comprises an external thread section 5 and an external transition section 6; the drill bit 1 is connected with the drill rod 2 through the thread matching of the internal thread section 3 and the external thread section 5, in the state that the drill rod 2 is matched and screwed with the drill bit 1, a gap is formed between the inner wall of the internal transition section 4 and the outer wall of the external transition section 6, and the included acute angle between the front end tangent plane of the internal transition section 4 and the axis is smaller than the included acute angle between the tail end tangent plane of the internal transition section 4 and the axis and/or the included acute angle between the front end tangent plane of the external transition section 6 and the axis is smaller than the included acute angle between the tail end tangent plane of the external transition section 6 and the axis. The drill rod is a hollow long rod-shaped component, the external thread section is provided with external threads, and the external threads are positioned at one end of the drill rod used for connecting a drill bit, wherein the external threads can be threads formed on the peripheral side surface of the drill rod in a turning mode and the like. The external support section (external transition section 6) is positioned in the direction of the external thread section far away from the drill bit and is formed on the peripheral side surface of the drill rod. In the disclosure, the drill bit may be a sleeve-shaped component with an outer end surface provided with cemented carbide, the outer end surface may be provided with a cemented carbide block for chiseling a rock wall by means of embedding or the like, an inner thread section is provided inside, the inner thread section is provided corresponding to an outer thread section of the drill rod, the inner thread section forms an inner thread matching with the outer thread of the drill rod, and the length of the inner thread section in the axial direction of the drill rod may be equal to or less than the length of the outer thread section; the external thread is matched with the internal thread, and the drill bit and the drill rod are screwed up to be fixedly connected. The tail end of the outer end face of the drill bit can be provided with an inner support section (an inner transition section 4), and the inner support section extends from the inner thread section towards the tail end along the axial direction of the drill bit; under the state that the external thread of the drill rod and the internal thread of the drill bit are screwed, the inner supporting section and the outer supporting section are arranged at intervals to form a gap; during the assembling process, the buffer part can be sleeved on the outer support section of the drill rod and is in sliding or fixed connection with the outer support section of the drill rod, and then the drill bit and the drill rod are screwed tightly; or the buffer part can be arranged in the inner support section and is contacted with or fixedly connected with the inner support section of the drill bit, and then the drill rod and the drill bit are screwed tightly; under the state that the drill bit and the drill rod are screwed, a certain distance of clearance is reserved between the inner wall of the inner support section and the outer wall of the outer support section under the state that the drill rod and the drill bit are matched and screwed, so that the direct contact between the drill rod and the drill bit is avoided, meanwhile, the structures of the inner transition section of the drill bit and the outer transition section of the drill rod are improved, the included acute angle between the front end tangent plane of the inner transition section 4 and the axis is smaller than the included acute angle between the tail end tangent plane of the inner transition section 4 and the axis and/or the included acute angle between the front end tangent plane of the outer transition section 6 and the axis is smaller than the included acute angle between the tail end tangent plane of the outer transition section 6 and the axis, so that the clearance formed by the drill bit and the drill rod is gradually opened in an axial direction in a gentle mode, the bending resistance of the whole rock drilling tool is effectively enhanced, the contact stress is remarkably reduced, and the impact force during contact is further effectively reduced, the breaking probability of the whole rock drilling tool is reduced, and the time cost and the economic cost are saved.

The utility model discloses an in some embodiments, as shown in fig. 2A-4B, 4 inner walls of interior changeover portion, 6 outer walls of outer changeover portion can be multistage arc surface or the continuous conical surface of multistage respectively, can process out arc surface or the continuous conical surface of multistage including the changeover portion inner wall alone, also process out arc surface or the continuous conical surface of multistage at the outer changeover portion outer wall alone, also can process out arc surface or the continuous conical surface of multistage including changeover portion inner wall, outer changeover portion outer wall simultaneously. The flexibility of the drill rod is effectively reduced through structural improvement, and further the contact stress of the drill bit and the drill rod is reduced. For example, in fig. 2A and 2B, the inner transition section 4 and the outer transition section 6 are both two arc surfaces, and the included acute angle between the arc-shaped tangent plane close to the inner thread section 3 and the axis is smaller than the included acute angle between the arc-shaped tangent plane far from the inner thread section 3 and the axis. The included acute angle between the arc-shaped section close to the external thread section 5 and the axis is smaller than the included acute angle between the arc-shaped section far away from the external thread section 5 and the axis. In another example, as shown in fig. 3A and 3B, the inner transition section 4 and the outer transition section 6 are three arc surfaces, and the included acute angle between the arc-shaped section closer to the inner thread section 3 and the axis is smaller, and the included acute angle between the arc-shaped section farther from the inner thread section 3 and the axis is larger. The outer transition section 6 matched with the inner transition section 4 has the acute angle between the arc-shaped section close to the outer thread section 5 and the axis smaller, and the acute angle between the arc-shaped section far away from the outer thread section 5 and the axis larger. In another example, as shown in fig. 4A and 4B, the inner transition section 4 and the outer transition section 6 may also be four arc surfaces, and the included acute angle between the arc-shaped section closer to the inner thread section 3 and the axis is smaller, and the included acute angle between the arc-shaped section farther from the inner thread section 3 and the axis is larger. The outer transition section 6 matched with the inner transition section 4 has the acute angle between the arc-shaped section close to the outer thread section 5 and the axis smaller, and the acute angle between the arc-shaped section far away from the outer thread section 5 and the axis larger.

In some embodiments of the present disclosure, both ends of each of the plurality of continuous conical surfaces can be smoothly transited. In the multi-section continuous conical surfaces, the angle formed by each single-section conical surface and the axis of the drill rod is different, so that a certain angle can be formed by two adjacent single-section conical surfaces, and the strength and the durability of the whole structure can be improved by smoothly transitioning the two adjacent single-section conical surfaces.

The utility model discloses an in some embodiments, the arc surface is single section arc surface, multistage continuous arc surface or discontinuous dispersion distribution arc surface. Compared with a plane with a constant diameter, the conical surface and the arc surface can better provide strong support for the contact of the drill bit and the drill rod, when the drill bit and the drill rod are in an initial state, after the drill bit and the drill rod are fixedly connected through threads, a gap can be reserved between the outer support section of the drill rod and the inner support section of the drill bit, when the drill tool starts to operate, the drill rod can be bent and deformed by impact and rotation power, the drill rod and the drill bit can be contacted at a certain position to generate contact stress, compared with direct contact, the contact after the displacement is greatly reduced, meanwhile, after a buffer component is further used, the displacement speed of the drill rod can be reduced to play a buffer role, and the certain section surface which is contacted firstly is positioned at the position which is most far away from the end part of the drill bit at the outer support section of the drill rod and the inner support section of the drill bit, so that the arrangement of a single-section arc surface, a multi-section continuous arc surface or a dispersed discontinuous distribution arc surface is adopted, the drill rod and the drill bit can be contacted with each other at the first time from one side or two sides to provide better supporting force, the fixing modes can adopt the modes of thread fixing, bonding fixing, welding fixing, riveting fixing or annular and similar semi-annular sleeves on the outer wall of the outer supporting section, the structural strength of the whole drill tool is integrally increased, meanwhile, the contact buffer space is increased, and a certain correction effect is also generated on the bending of the drill rod.

The utility model discloses an in some embodiments, the acute angle can be for 0.5 ~ 15. In order to avoid the overlarge length of the outer transition section and reduce the turning length, the bending strength of the drill rod is considered.

In some embodiments of the present disclosure, the inner transition section length is not longer than (less than or equal to) the outer transition section length. The contact between the tail part of the drill bit and the larger diameter part of the outer wall of the drill rod is ensured, and the structural strength of the whole drilling tool is ensured.

In some embodiments of the present disclosure, the clearance between the bit and the shank support surface is 0.3mm to 5 mm. The distance between the drill bit and the drill rod supporting surface directly influences the probability of drill tool fracture, the distance is too small, the drill bit can be contacted with the drill rod only by slight vibration, the effect of buffering impact force cannot be effectively achieved, the buffer significance is lost when the distance is too large, an overlarge space is reserved for drill rod bending, and the degree of drill rod bending is increased.

In some embodiments of the present disclosure, a buffer material is filled in the gap between the bit and the drill rod. The contact between the drill rod and the hard material of the drill bit is buffered, and the abrasion damage degree is reduced.

Based on same design, the utility model also provides a rock drill installs the anti rock drilling tool that rolls over of any embodiment of the first aspect. The main mechanism of the rock drill is an impact hammer which does repeated movement in the cylinder body, under the action of air pressure and hydraulic pressure, the impact hammer continuously impacts the tail end of a drill bit tail of a drill tool, each time the impact hammer impacts the rock to a certain depth to form a dent, the rock at the dent is crushed, when the impact hammer returns to the stroke, under the action of a drill rod rotating mechanism of the rock drill, the drill tool rotates for a certain angle and then impacts the drill bit tail again, the process is repeated, meanwhile, the drill tool continuously drills forward, the generated powder is continuously and timely removed, otherwise, a drill bit cannot effectively work, a drill bit group can be clamped, the rock drill cannot normally work, normal production is influenced, and the human health can be greatly injured, therefore, the rock drill is also provided with a powder removing structure, and for the whole rock drill, the core mechanism of the rock drill lies in a drill rod and a drill bit of the impact mechanism, adopt the anti rock drilling tool that rolls over of any embodiment of first aspect to improve the usability of rock drill, still can keep higher use strength under high strength, long-time effect, improved work efficiency, the utility model discloses the rock drill can be pnematic rock drill, hydraulic rock drill, electric rock drill, internal-combustion rock drill.

Based on same design, the utility model also provides a drill jumbo installs the rock drill of the embodiment of the second aspect. The drill jumbo fixes the rock drill on the track frame, provides axial drive force through the propeller and makes the rock drill remove along the track frame to carry out the drilling operation, can include rock drill, advancing system, positioning system and track frame, based on the needs that improve to the production quality, the degree of mechanization of drill jumbo is better, at specific job scene, can satisfy the production needs better, the utility model discloses the drill jumbo can be open-air drill jumbo, underground drill jumbo.

In the practical application process, the rock drilling tool is subjected to impact force and rotary force from a rock drilling machine, when a drill bit is contacted with a rock body to break and form a hole, the outer transition section of the drill rod can be bent under the action of bending moment, and after the gap distance between the inner wall of the inner transition section and the outer wall of the outer transition section is changed, the outer transition section is contacted with the inner transition section, so that the direct contact between the drill rod and the drill bit is avoided, the bending resistance of the whole rock drilling tool is effectively enhanced, and the contact stress is remarkably reduced.

It will be understood that the present disclosure is not limited to the precise arrangements that have been described above and illustrated in the drawings, and that various modifications and changes may be made without departing from the scope thereof, which is limited only by the claims that follow.

The foregoing description of the implementation of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the invention. The embodiments were chosen and described in order to explain the principles of the invention and its practical application to enable one skilled in the art to utilize the invention in various embodiments and with various modifications as are suited to the particular use contemplated.

Although operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.

The methods and apparatus of the present disclosure can be accomplished with standard programming techniques with rule-based logic or other logic to accomplish the various method steps. It should also be noted that the words "means" and "module," as used herein and in the claims, is intended to encompass implementations using one or more lines of software code, and/or hardware implementations, and/or equipment for receiving inputs.

Any of the steps, operations, or procedures described herein may be performed or implemented using one or more hardware or software modules, alone or in combination with other devices. In one embodiment, the software modules are implemented using a computer program product comprising a computer readable medium containing computer program code, which is executable by a computer processor for performing any or all of the described steps, operations, or procedures.

The foregoing description of the implementations of the disclosure has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure to the precise form disclosed, and modifications and variations are possible in light of the above teachings or may be acquired from practice of the disclosure. The embodiments were chosen and described in order to explain the principles of the disclosure and its practical application to enable one skilled in the art to utilize the disclosure in various embodiments and with various modifications as are suited to the particular use contemplated.

Claims (10)

1. An anti rock drilling tool that rolls over which is characterized in that: the drill bit comprises a drill bit (1) and a drill rod (2), wherein the drill bit (1) comprises a head part used for mining engineering, a hollow structure is arranged on one side far away from the head part, the hollow structure comprises an internal thread section (3) and an internal transition section (4), and the internal transition section (4) is arranged on one side far away from the head part of the internal thread section (3); the drill rod (2) comprises an external thread section (5) and an external transition section (6); the drill bit (1) is in threaded fit connection with the drill rod (2) through an internal thread section (3) and an external thread section (5), in a state that the drill rod (2) is in fit tightening with the drill bit (1), a gap is formed between the inner wall of the internal transition section (4) and the outer wall of the external transition section (6), and the included acute angle between the front end tangent plane of the internal transition section (4) and the axis is smaller than the included acute angle between the tail end tangent plane of the internal transition section (4) and the axis and/or the included acute angle between the front end tangent plane of the external transition section (6) and the axis is smaller than the included acute angle between the tail end tangent plane of the external transition section (6) and the axis.

2. A fracture-resistant rock drilling tool as claimed in claim 1, wherein: the inner wall of the inner transition section (4) and the outer wall of the outer transition section (6) are arc surfaces or a plurality of continuous conical surfaces.

3. A fracture-resistant rock drilling tool as claimed in claim 2, wherein: and two ends of each section of conical surface of the multi-section continuous conical surface are in smooth transition.

4. A fracture-resistant rock drilling tool as claimed in claim 2, wherein: the arc surface is a single-section arc surface, a multi-section continuous arc surface or a discontinuous dispersion distribution arc surface.

5. A fracture-resistant rock drilling tool as claimed in claim 1, wherein: the acute angle is 0.5-15 degrees.

6. A fracture-resistant rock drilling tool as claimed in claim 1, wherein: the length of the inner transition section (4) is less than or equal to the length of the outer transition section (6).

7. A fracture-resistant rock drilling tool as claimed in claim 1, wherein: the clearance between the drill bit (1) and the drill rod (2) is 0.3 mm-5 mm.

8. A fracture-resistant rock drilling tool as claimed in claim 1, wherein: and filling a buffer material in a gap between the drill bit (1) and the drill rod.

9. A rock drill comprising an anti-break rock drilling tool as claimed in any one of claims 1 to 8.

10. A rock drilling rig comprising a rock drill according to claim 9.

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