CN217439975U - Drill rod protective sleeve, protective assembly and drill rod assembly applied to rock drill - Google Patents

Abstract

The present disclosure relates to a drill rod protective sheath, a drill rod protective assembly and a drill rod assembly for use in rock drilling machines. Wherein, the drill rod protective sleeve is of an annular sleeve structure; the drill rod protective sleeve is sleeved on the screw rod at the front end of the drill rod; one side of the drill rod protective sleeve is abutted against the end face of the drill bit, and the other side of the drill rod protective sleeve is abutted against or arranged at intervals with a shaft shoulder of the drill rod; or one side of the drill rod protective sleeve is abutted to the end face of the drill bit or arranged at intervals, and the other side of the drill rod protective sleeve is abutted to the shaft shoulder of the drill rod. The utility model discloses a set up the drill rod protective sheath between bore bit terminal surface and drill rod shaft shoulder, effectively increase lifting surface area, solve the stress concentration problem, strengthened the intensity that threaded connection is in the drilling process, reduced the risk of screw thread inefficacy. Meanwhile, when the drill rod is subjected to the action of bending moment, the drill rod shaft shoulder is abutted against the end face of the drill rod protective sleeve, so that the action of the bending moment on part of the drill rod is counteracted, and the fracture risk of the drill rod screw section near the position corresponding to the end face of the drill bit caused by the bending moment can be reduced.

Description

Drill rod protective sleeve, protective assembly and drill rod assembly applied to rock drill

Technical Field

The utility model relates to a rock drilling equipment, in particular to drill rod protective sheath, drill rod protection subassembly and be applied to the drill rod subassembly of rock drill.

Background

The rock drill mainly comprises an impact mechanism, a swing mechanism, a water and powder supply device, a dust prevention system and the like. The rock drilling operation is the integration of the functions of impact, rotation, propulsion and rock hole flushing. The drill tool generally includes a drill rod, a bit, a connecting sleeve, and the like. The shank adapter is generally provided with splines for connection to a swing mechanism of the rock drill, which drives a set of gear units via a hydraulic motor and drives the shank adapter to perform independent swing motions. The water supply device is used for reducing the temperature of the drill tool on one hand, and is used for flushing out rock fragments, dust and the like generated by chiseling a rock wall on the other hand, so that smooth rock drilling is guaranteed. He has two types, central water supply and side water supply. The central water supply type pressure water passes through the middle hole of the piston from a water injection hole at the rear part of the rock drill through a water needle and enters the front drill bit shank to flush the drilled hole. The side water supply device is a structure widely adopted by hydraulic rock drills. And flushing water enters the water inlet hole of the drill shank through the water supply sleeve at the front part of the rock drill to flush the drilled hole. The drill bit is generally made of No. 40 steel, and the front end of the drill bit is generally provided with a plurality of hard alloy blocks. The drill rod is generally made of 42CrMo alloy steel in China, and the imported drill rod is generally made of SCM440 alloy steel.

At present, a drill rod and a drill bit structure used on the existing impact rock drill are generally characterized in that a screw rod is manufactured at the front end of the drill rod, an external thread section is arranged on the screw rod, an internal thread section is arranged in a blind hole of the drill bit, and the drill rod and the drill bit are connected together in a thread tightening mode. As shown in fig. 1, in some techniques, the length of the drill rod screw is slightly longer than the depth of the drill bit blind hole, and in a state that the drill bit is screwed with the drill rod, a part of the drill rod screw which does not go deep into the drill bit blind hole is exposed to the external working environment, a large gap is formed between the end surface of the drill bit and the shaft shoulder of the drill rod, and when rock drilling is performed, rock fragments, dust and the like generated by impacting a rock wall are filled in the gap with a high probability, so that the normal operation of the rock drilling is influenced. Moreover, because a gap exists between the end face of the drill bit and the shaft shoulder of the drill rod, most of the impact force of drill bit impact is borne by the front end face of the drill rod screw rod, the impact stress is concentrated, and when the impact force is too large, the drill rod is likely to be damaged by impact. Meanwhile, a part of the impact force is borne by the threads of the drill bit and the drill rod, and when the impact force is too large, the threads risk being damaged, and further, the threaded connection fails.

In addition, when the impact rock drill works, the working state is impact and torsion, the impact force and the torque are mainly transmitted through the internal and external thread connecting part and the end part of the drill rod, the matching part still needs to drive the drill bit to do rotary motion through the drill rod under the condition of continuous high-frequency vibration, the external thread end part of the drill rod is continuously impacted and extruded, and the external thread end part of the drill rod is mostly concentrated at the external thread end part of the drill rod, so that the part near the external thread end part of the drill rod is very easy to break.

In summary, the connection structure between the drill rod and the drill bit adopted by the current impact rock drill is not ideal enough, and has great potential safety hazard.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a drill rod protective sheath, drill rod protection component and be applied to the drill rod subassembly of rock drill can solve the drill rod that current rock drill used and the unsatisfactory problem of bore bit connection structure, reduce the short-rod risk.

According to a first aspect of an embodiment of the present disclosure, a shank protector is provided.

According to the embodiment of the utility model, the drill rod protective sleeve is of an annular sleeve structure; the drill rod protective sleeve is sleeved on the screw rod at the front end of the drill rod;

one side of the drill rod protective sleeve is abutted against the end face of the drill bit, and the other side of the drill rod protective sleeve is abutted against or arranged at intervals with the shaft shoulder of the drill rod; or the like, or, alternatively,

one side of the drill rod protective sleeve is abutted to or arranged at intervals with the end face of the drill bit, and the other side of the drill rod protective sleeve is abutted to the shaft shoulder of the drill rod.

In some embodiments, the shank protector is internally threaded and is threadedly coupled to the threaded rod.

In some embodiments, the shank protector is made of a metallic material.

In some embodiments, the shank protector includes a buffer material, and one side of the shank protector abuts the bit face and the other side abuts the shoulder of the shank.

According to a second aspect of an embodiment of the present disclosure, a shank protector assembly is provided.

According to the utility model discloses an embodiment, the drill rod protection subassembly includes the aforesaid the drill rod protective sheath.

In some embodiments, the drill rod protection assembly further comprises a buffer washer, the buffer washer is sleeved on the screw rod and located between the drill bit and the drill rod protection sleeve, one side of the buffer washer is abutted to the end face of the drill bit, and the other side of the buffer washer is abutted to or spaced from the end face, far away from the shaft shoulder, of the drill rod protection sleeve.

In some embodiments, the drill rod protection assembly further comprises a buffer washer, the buffer washer is sleeved on the screw rod and located between the drill rod protection sleeve and the shaft shoulder, one side of the buffer washer is abutted to the end face, close to the shaft shoulder, of the drill rod protection sleeve, and the other side of the buffer washer is abutted to or spaced from the shaft shoulder.

In some embodiments, the shank protector assembly further comprises an auxiliary sleeve of the same construction as the shank protector; the auxiliary sleeve and the drill rod protective sleeve are both made of magnets; the auxiliary sleeve and the drill rod protective sleeve are arranged between the drill bit and the shaft shoulder at the same time, and the auxiliary sleeve is in butt joint with one end of the drill rod protective sleeve, which has the same polarity.

According to a third aspect of embodiments of the present disclosure, there is provided a drill rod assembly for application to a rock drilling machine.

According to the utility model discloses an embodiment, be applied to the drill rod subassembly of rock drill includes the aforesaid the drill rod protection component.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

according to the technical scheme of the utility model, through set up the drill rod protective sheath between bore bit terminal surface and drill rod shaft shoulder, can effectively increase lifting surface area, dispersed the impact stress that drill rod threaded connection department received, solved stress concentration problem, strengthened threaded connection and be in the intensity of drilling in-process, reduced the risk of screw thread inefficacy. Meanwhile, when the drill rod is subjected to the action of bending moment, the drill rod shaft shoulder is abutted against the end face of the drill rod protective sleeve, so that the action of the bending moment on a part of the drill rod can be counteracted, and the fracture risk caused by the bending moment on the position, corresponding to the end face of the drill bit, of the drill rod screw section can be reduced.

The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified. Wherein:

FIG. 1 is a schematic view of a prior art shank to bit connection;

FIG. 2 is a schematic view of a connection structure of a drill rod and a drill bit according to a first embodiment of the present invention;

FIG. 3 is a schematic view showing a connection structure of a drill rod and a drill bit according to a second embodiment of the present invention;

FIG. 4 is a schematic view showing a connection structure of a drill rod and a drill bit according to a third embodiment of the present invention;

FIG. 5 is a schematic view showing a connection structure of a drill rod and a drill bit according to a fourth embodiment of the present invention;

FIG. 6 is a schematic view showing a connection structure of a drill rod and a drill bit according to a fifth embodiment of the present invention;

fig. 7 is a schematic view of a drill rod and bit connection structure according to a sixth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will explain in detail each embodiment of the present invention with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments. The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.

The rock drill mainly comprises an impact mechanism, a swing mechanism, a water and powder supply device, a dust prevention system and the like. The rock drilling operation is the integration of the functions of impacting, rotating, propelling and rock hole flushing. Drill tools typically include a shank, a bit, and a connecting sleeve, among others. The shank adapter is generally provided with splines for connection to a swing mechanism of the rock drill, which drives a set of gear units via a hydraulic motor and drives the shank adapter to perform independent swing motions. The water supply device is used for reducing the temperature of the drill tool on one hand, and is used for flushing out rock fragments, dust and the like generated by chiseling a rock wall on the other hand, so that smooth rock drilling is guaranteed. He has two types, central water supply and side water supply. The central water supply type pressure water passes through the middle hole of the piston from a water injection hole at the rear part of the rock drill through a water needle and enters the front drill bit shank to flush the drilled hole. The side water supply device is a structure widely adopted by hydraulic rock drills. And flushing water enters the water inlet hole of the drill shank through the water supply sleeve at the front part of the rock drill to flush the drilled hole. The drill bit is generally made of No. 40 steel, and the front end of the drill bit is generally provided with a plurality of hard alloy blocks. The drill rod is generally made of 42CrMo alloy steel in China, and the imported drill rod is generally made of SCM440 alloy steel.

At present, a drill rod and a drill bit structure used on the existing impact rock drill are generally characterized in that a screw rod is manufactured at the front end of the drill rod, an external thread section is arranged on the screw rod, an internal thread section is arranged in a blind hole of the drill bit, and the drill rod and the drill bit are connected together in a thread tightening mode. As shown in fig. 1, in some techniques, the length of a drill rod screw 1 is slightly longer than the depth of a blind hole of a drill bit 2, and in a state that the drill bit is screwed with a drill rod, a part of the drill rod screw which does not go deep into the blind hole of the drill bit is exposed to an external working environment, a large gap is formed between the end surface of the drill bit and a shaft shoulder of the drill rod, and when rock drilling is carried out, rock fragments, dust and the like generated by impacting a rock wall are filled in the gap with a high probability, so that the normal operation of the rock drilling is influenced. Moreover, because a gap exists between the end face of the drill bit and the shaft shoulder of the drill rod, most of the impact force of drill bit impact is borne by the front end face of the drill rod screw rod, the impact stress is concentrated, and when the impact force is too large, the drill rod is likely to be damaged by impact. Meanwhile, a part of impact force is borne by the threads of the drill bit and the drill rod, and when the impact force is too large, the threads are in danger of being damaged, so that the threaded connection fails.

In addition, when the impact rock drill works, the working state of the impact rock drill is impact and torsion, impact force and torque are mainly transmitted through the internal and external thread connecting part and the end part of the drill rod, the drill rod drives the drill bit to do rotary motion under the condition that the matching part of the impact rock drill continuously vibrates at high frequency, the external thread end part of the drill rod is continuously impacted and extruded, and because stress is mostly concentrated on the external thread end part of the drill rod, the fracture is easily generated near the external thread end part of the drill rod.

In summary, the connection structure between the drill rod and the drill bit adopted by the current impact rock drill is not ideal enough, and has great potential safety hazard.

An aspect of the utility model relates to a drill rod protective sheath. Some implementation details of the drill rod protective sleeve of the scheme of the invention are specifically described below.

In some embodiments, as shown in FIGS. 2-7, the shank protector 11 is of annular sleeve construction; the drill rod protective sleeve 11 is sleeved on a screw rod 21 at the front end of the drill rod 20; one side of the drill rod protective sleeve 11 is abutted against the drill bit end face 31, and the other side is abutted against or arranged at intervals with the shaft shoulder 22 of the drill rod 20; alternatively, one side of the shank sleeve 11 is in contact with or spaced from the bit end face 31, and the other side is in contact with the shoulder 22 of the shank 20. The utility model discloses in, bore bit 30 can be one section and be provided with carbide's cover barrel-shaped structure, and outside terminal surface can be provided with the carbide piece that is used for the chisel to hit the cliff, is provided with the screw thread blind hole in the inside axis direction. The drill rod 20 may be a hollow long rod-shaped member, a screw 21 is provided at a front section, an external thread section is provided on the screw 21, and the outer diameter of the screw 21 may be slightly smaller than the outer diameter of the drill rod 20 at other positions. The internal thread of the drill bit blind hole is matched with the external thread of the drill rod screw, and the drill bit 30 and the drill rod 20 are assembled by screwing. The shank protector 11 may be of annular, sleeve-like configuration, and may have an inner diameter equal to or slightly larger than the outer diameter of the threaded rod 21 and an outer diameter equal to or slightly smaller than the outer diameter at the end face of the bit 30. The shank sleeve 11 may be made entirely of a metallic material, such as a metallic alloy material such as 42CrMo alloy steel or SCM440 alloy steel. In the tightened state of the threaded connection of the drill rod 20 and the drill bit 30, the shoulder 22 of the drill rod 20 is not in contact with the end face 31 of the drill bit, the threaded rod 21 has a small section exposed to the outside, a space is formed between the shoulder 22 and the end face 31 of the drill bit, and the drill rod protective sleeve 11 can be placed in the space by being sleeved on the threaded rod 21. One side of drill rod protective sleeve 11 can with bore bit terminal surface 31 butt, the opposite side and the shaft shoulder 22 butt of drill rod 20, so set up, some impact force that bore bit 30 received can be transmitted to the terminal surface of shaft shoulder 22 by bore bit terminal surface 31 through drill rod protective sleeve 11, lifting surface has been increased to a certain extent, the impact stress that bore rod 20 threaded connection department received has been dispersed, the stress concentration problem can be effectively solved, the intensity that threaded connection is in the drilling process has been strengthened, the risk of screw thread inefficacy has been reduced. Meanwhile, the shaft shoulder 22 of the drill rod 20 abuts against the end face of the drill rod protective sleeve 11, when the drill rod 20 is subjected to bending moment, the drill rod protective sleeve 11 can counteract the bending moment applied to a part of the drill rod 20, and the fracture risk caused by the bending moment applied to the position, corresponding to the position of the drill bit end face 31, of the screw rod 21 can be reduced. Other implementation details of the scheme of the present invention are specifically described below.

In other embodiments, the shank sleeve 11 may be spaced from the bit end face 31 on one side and abut the shoulder 22 of the shank 20 on the other side; alternatively, one side of the shank sleeve 11 may abut against the bit end face 31 and the other side may be spaced from the shoulder 22 of the shank 20. According to the two arrangements, a small gap is left between the drill rod protective sleeve 11 and the drill bit end face 31, or a small gap is left between the drill rod protective sleeve 11 and the shaft shoulder 22 of the drill rod 20, so that no over-positioning occurs in the axial direction or the radial direction, and only when the drill rod 20 is subjected to bending moment, the drill rod protective sleeve 11 can be contacted with the drill bit end face 31 or the shaft shoulder 22 of the drill rod 20, so that the risk that the screw rod 21 on the drill rod 20 is broken due to the bending moment in the vicinity of the position corresponding to the drill bit end face 31 can be reduced.

In some embodiments, as shown in FIG. 3, the shank sleeve 11 is internally threaded, and the shank sleeve 11 is threadedly coupled to the threaded rod 21. In this embodiment, the external thread on the threaded rod 21 may cover the entire length of the threaded rod 21 in the axial direction, and the external thread on the threaded rod 21 may cooperate with the internal thread of the drill rod protection 11, so that the drill rod protection 11 may be fixedly connected to the threaded rod 21 of the drill rod 20 by means of a threaded connection. According to the technical scheme of the embodiment, the inner wall of the drill rod protecting sleeve 11 is provided with the internal thread, the drill rod protecting sleeve 11 is connected with the screw 21 in a threaded manner, the drill rod protecting sleeve 11 can be limited at a specific position on the screw 21, and the connection stability of the drill rod protecting sleeve 11 on the drill rod 20 is improved.

In some embodiments, the shank sleeve 11 includes a buffer material, and one side of the shank sleeve 11 abuts the bit end face 31 and the other side abuts the shoulder 22 of the shank 20. When the drill rod 20 receives the action of bending moment, the end surface of the drill rod protecting sleeve 11 abutting against the shaft shoulder 22 and the other end surface of the drill rod protecting sleeve 11 abutting against the drill bit end surface 31 are subjected to large and concentrated extrusion force, and if the drill rod protecting sleeve 11 is made of hard alloy materials, the risk that the two end surfaces are broken is easily caused. For this reason, in the present embodiment, the shank protector 11 may be made of a buffer material as a whole; or, a part of the cushion material may be made of metal material for the inner layer and the outer layer, or both ends of the cushion material and the middle part of the cushion material. The buffer material can be toughened plastic or polytetrafluoroethylene. According to the arrangement mode of the embodiment, when the drill rod 20 is subjected to bending moment, the drill rod protective sleeve 11 made of the buffer material can play a good bending-resistant role, and can effectively buffer the axial impact force applied to the drill rod 20, so that the impact stress applied to a part of the drill rod 20 is reduced, the problem of stress concentration is solved, the connection strength of the threaded connection in the drilling process is enhanced, the fracture risk caused by stress concentration is reduced, and the risk that two end faces of the drill rod protective sleeve 11 are cracked due to extrusion is avoided.

Another aspect of the present invention relates to a drill rod protection assembly, including the drill rod protection sleeve 11 in the above embodiments. The following describes in detail the implementation details of a drill rod protection assembly according to the present invention, and the following is only provided for the sake of understanding and is not necessary for implementing the present solution.

In some embodiments, as shown in fig. 5, the shank protector further includes a cushion washer 12, the cushion washer 12 is sleeved on the screw 21 and located between the bit 30 and the shank protector 11, and one side of the cushion washer abuts against the bit end face 31 and the other side abuts against or is spaced apart from the end face of the shank protector 11 away from the shoulder 22. The inside diameter of the cushion washer 12 may be equal to or slightly larger than the inside diameter of the shank shroud 11, but may not exceed the outside diameter at the end face of the bit 30. The outer diameter of the cushion washer 12 may be equal to or slightly smaller than the outer diameter of the shank protector 11. The cushion washer 12 may be made of a cushion material, or may be made of a wear-resistant material on the outer side and a cushion material on the inner side. The buffer material can be toughened plastic or polytetrafluoroethylene and the like, and the wear-resistant material can be POM material and the like. Under the normal working state of the rock drill, the buffer washer 12 is sleeved on the screw 21 at the front section of the drill rod 20 and can be positioned between the drill bit 30 and the drill rod protective sleeve 11, one side of the buffer washer 12 can be abutted against the end surface 31 of the drill bit, and a small gap is reserved between the other side of the buffer washer and the end surface of the drill rod protective sleeve 11 far away from the shaft shoulder 22. With the arrangement, the bit end face 31 is not contacted with the buffer washer 12, so that no over-positioning occurs in the axial direction and the radial direction, and only when the drill rod 20 is subjected to bending moment, the bit end face 31 is contacted with the buffer washer 12, so that the axial impact force applied to the drill rod 20 during working can be obviously reduced, and meanwhile, the risk that the end face of the drill rod protective sleeve 11, the end face of the shaft shoulder 22 and the bit end face 31 are cracked due to extrusion is avoided

In some embodiments, as shown in fig. 6, the drill rod protection assembly further includes a buffer washer 12, the buffer washer 12 is sleeved on the screw rod 21 and located between the drill rod protection sleeve 11 and the shaft shoulder 22, and one side of the buffer washer abuts against an end surface of the drill rod protection sleeve 11 close to the shaft shoulder 22, and the other side of the buffer washer abuts against or is spaced from the shaft shoulder 22. The inside diameter of the cushion washer 12 may be equal to or slightly larger than the inside diameter of the shank shroud 11, but may not exceed the outside diameter at the end face of the bit 30. The outer diameter of the cushion washer 12 may be equal to or slightly smaller than the outer diameter of the shank protector 11. The cushion washer 12 may be made of a cushion material, or may be made of an abrasion resistant material on the outer side and a cushion material on the inner side. The buffer material can be toughened plastic or polytetrafluoroethylene and the like, and the wear-resistant material can be POM material and the like. Under the normal working state of the rock drill, the buffer washer 12 is sleeved on the screw rod 21 at the front section of the drill rod 20 and can be positioned between the drill rod protective sleeve 11 and the shaft shoulder 22, one side of the buffer washer 12 can be abutted against the end face, close to the shaft shoulder 22, of the drill rod protective sleeve 11, and a small gap is reserved between the other side of the buffer washer and the end face of the shaft shoulder 22. With the arrangement, the end face of the shaft shoulder 22 is not in contact with the buffer washer 12, so that no over-positioning occurs in the axial direction and the radial direction, and only when the drill rod 20 is subjected to bending moment, the end face of the shaft shoulder 22 is in contact with the buffer washer 12, so that the risk that the end face of the drill rod protective sleeve 11, the end face of the shaft shoulder 22 and the drill bit end face 31 are cracked due to extrusion can be avoided while the axial impact force applied to the drill rod 20 during working is obviously reduced.

In some embodiments, as shown in FIG. 7, the shank protector assembly further comprises an auxiliary sleeve 13, the auxiliary sleeve 13 being of the same construction as the shank protector 11; the auxiliary sleeve 13 and the drill rod protective sleeve 11 are both made of magnets; the auxiliary sleeve 13 and the drill rod protection sleeve 11 are arranged between the drill bit 30 and the shaft shoulder 22 at the same time, and the auxiliary sleeve 13 is in butt joint with one end of the drill rod protection sleeve 11 with the same polarity. The auxiliary sleeve 13 may be identical in shape, size and material to the shank protector 11, and both the shank protector 11 and the auxiliary sleeve 13 are made of magnets. The sum of the axial lengths of the shank sleeve 11 and the auxiliary sleeve 13 may be smaller than the axial distance between the shank end face 31 and the shoulder 22 in the state of the threaded connection of the shank 30 to the shank 20. In the normal working state of the rock drill, the drill rod protection sleeve 11 and the auxiliary sleeve 13 can be arranged between the drill bit 30 and the shaft shoulder 22 at the same time, and the auxiliary sleeve 13 is butted with one end of the drill rod protection sleeve 11 with the same polarity. For example, the N pole of the drill rod protection sleeve 11 and the N pole of the auxiliary sleeve 13 are butted, and the drill rod protection sleeve 11 and the auxiliary sleeve 13 are simultaneously subjected to repulsive force by repulsive action between the same polarities, so as to move to both sides, and the drill rod protection sleeve 11 and the auxiliary sleeve 13 are respectively abutted to the bit end face 31 and the shoulder 22 on both sides thereof. With this arrangement, the auxiliary sleeve 13 does not come into contact with the shank protector 11 and therefore cannot be over-positioned both axially and radially. According to the technical scheme of the embodiment, two buffer sleeves made of magnets are arranged between the drill bit 30 and the shaft shoulder 22, so that the axial impact force applied to the drill rod 20 during working can be obviously reduced through the repulsion action between the same polarities, the effective buffer action is achieved, the strength of the drill rod is improved, and the risk that the end face of the shaft shoulder 22 and the end face 31 of the drill bit are cracked due to extrusion is reduced to a certain extent.

It is understood that "a plurality" in this disclosure means two or more, and other words are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

It will be further understood that the terms "central," "longitudinal," "lateral," "front," "rear," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used herein to denote orientations and positional relationships, based on the orientation or positional relationship shown in the drawings, and are used merely to facilitate description of the embodiments and to simplify the description, but do not indicate or imply that the referenced devices or elements must be constructed and operated in a specific orientation.

It will be further understood that, unless otherwise specified, "connected" includes direct connections between the two without the presence of other elements, as well as indirect connections between the two with the presence of other elements.

It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to 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.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (9)

1. The drill rod protective sleeve is characterized in that the drill rod protective sleeve (11) is of an annular sleeve structure; the drill rod protective sleeve (11) is sleeved on a screw rod (21) at the front end of the drill rod (20);

one side of the drill rod protective sleeve (11) is abutted against the end face (31) of the drill bit, and the other side of the drill rod protective sleeve is abutted against or arranged at intervals with a shaft shoulder (22) of the drill rod (20); or the like, or, alternatively,

one side of the drill rod protective sleeve (11) is abutted against or arranged at intervals with the drill bit end face (31), and the other side of the drill rod protective sleeve is abutted against a shaft shoulder (22) of the drill rod (20).

2. A shank protector according to claim 1, characterised in that the shank protector (11) is provided with an internal thread, the shank protector (11) being in threaded connection with the screw (21).

3. A shank protector according to claim 1 or 2, characterised in that the shank protector (11) is made of a metallic material.

4. A shank protector according to claim 1 or 2, characterised in that the shank protector (11) comprises a buffer material, the shank protector (11) abutting on one side against the bit end face (31) and on the other side against a shoulder (22) of the shank (20).

5. A shank protector assembly, characterized by comprising a shank protector (11) according to any of claims 1-4.

6. The shank protector assembly according to claim 5, further comprising a cushion washer (12), wherein the cushion washer (12) is sleeved on the screw rod (21) and located between the bit (30) and the shank protector (11), and one side of the cushion washer abuts against the bit end face (31) and the other side of the cushion washer abuts against or is spaced apart from the end face of the shank protector (11) away from the shoulder (22).

7. The drill rod protection assembly according to claim 5, further comprising a buffer washer (12), wherein the buffer washer (12) is sleeved on the screw rod (21) and located between the drill rod protection sleeve (11) and the shaft shoulder (22), and one side of the buffer washer abuts against an end surface of the drill rod protection sleeve (11) close to the shaft shoulder (22), and the other side of the buffer washer abuts against or is spaced from the shaft shoulder (22).

8. The shank protector assembly according to claim 5, characterized in that it further comprises an auxiliary sleeve (13), the auxiliary sleeve (13) being of the same construction as the shank protector (11); the auxiliary sleeve (13) and the drill rod protective sleeve (11) are both made of magnets; the auxiliary sleeve (13) and the drill rod protective sleeve (11) are arranged between the drill bit (30) and the shaft shoulder (22) at the same time, and the auxiliary sleeve (13) is in butt joint with one end of the drill rod protective sleeve (11) with the same polarity.

9. A drill rod assembly for use in rock drilling machines, comprising a drill rod protector assembly according to any one of claims 5 to 8.

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