Drilling tool

Abstract

The invention relates to the technical field of drilling tools, in particular to a drilling tool. Comprising a drill rod assembly and a drill bit assembly. The drilling tool has a first working state and a second working state; the first working state includes that impact force borne by the rock drilling unit is larger than a first value, the end, close to the connecting unit, of the bearing unit abuts against the end, away from the rock drilling unit, of the trouser body unit, and the end, away from the bearing unit, of the connecting unit abuts against the end, close to the trouser body unit, of the rock drilling unit. In the second working state, the impact force borne by the rock drilling unit is smaller than a second value, the end, close to the connecting unit, of the bearing unit abuts against the end, away from the rock drilling unit, of the trouser body unit, and the end, away from the bearing unit, of the connecting unit and the end, close to the trouser body unit, of the rock drilling unit are arranged at intervals; wherein the first value is greater than the second value. Therefore, the problem that the abutting position of the drill bit and the drill rod of an existing stepped drilling tool is prone to breakage or failure in the drilling process of the drill bit is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of drilling tools, and in particular to a drilling tool. Background Art

[0002] The drill tool is mainly composed of a drill rod and a drill bit. The drill bit is used to break the rock, and the drill rod is used to transmit power. The power is transmitted to the drill bit through the drill rod, so that the drill bit can break the rock for drilling. During the drilling process, the rock will also produce a reaction force on the drill bit, which will be transmitted to the drill rod by the drill bit. The connection between the drill bit and the drill rod is not homogeneous during the force transmission process, and the force changes more obviously. During the long-term rock drilling process, the connection between the drill bit and the drill rod is most likely to be damaged. How to improve the stress condition at the connection between the drill bit and the drill rod is a key factor in extending the life of the drill tool.

[0003] The existing connection method between the drill rod and the drill bit is to improve the bottom punch type of the corrugated thread connection to the step type of the corrugated thread connection. The step type drilling tool has a certain effect of reducing the force on the corrugated thread connection between the drill bit and the drill rod during the drilling process of the drill bit. However, when the existing step type drilling tool is subjected to axial impact force, the drill bit has a large impact force during operation. Under the impact of the high frequency and large force of the drill bit, the abutment between the drill rod and the drill bit is prone to breakage or failure, thereby affecting the service life of the drilling tool. Summary of the invention

[0004] In order to solve the problem that the abutment between the drill bit and the drill rod of the existing stepped drilling tool is easy to break or fail during the rock drilling process of the drill bit, the present invention provides a drilling tool, comprising:

[0005] A drill rod assembly, the drill rod assembly comprising a drill rod unit, a bearing unit, and a connecting unit; one end of the bearing unit is fixedly connected to one end of the drill rod unit, and the other end is fixedly connected to one end of the connecting unit;

[0006] A drill bit assembly, the drill bit assembly comprising a trousers unit and a rock drilling unit; one end of the trousers unit is fixedly connected to one end of the rock drilling unit, and the trousers unit is connected to the connecting unit;

[0007] The drilling tool includes a first working state and a second working state; the first working state includes: the impact force received by the rock drilling unit is greater than a first value, an end of the bearing unit close to the connecting unit abuts against an end of the trouser unit away from the rock drilling unit, and an end of the connecting unit away from the bearing unit abuts against an end of the rock drilling unit close to the trouser unit; the second working state includes: the impact force received by the rock drilling unit is less than a second value, an end of the bearing unit close to the connecting unit abuts against an end of the trouser unit away from the rock drilling unit, and an end of the connecting unit away from the bearing unit is spaced apart from an end of the rock drilling unit close to the trouser unit; wherein the first value is greater than the second value.

[0008] In some embodiments, when the drilling tool is in the second working state, the distance between an end of the connecting unit away from the bearing unit and an end of the rock drilling unit close to the trousers unit is K, wherein 0.2 mm≤K≤0.5 mm.

[0009] In some embodiments, the bearing unit includes a first bearing part and a plurality of first slag discharge grooves; the first slag discharge groove is recessed from a portion of the outer circumferential surface of the first bearing part inwardly along the radial direction of the first bearing part; the first slag discharge groove passes through the two end surfaces of the first bearing part along the axial direction of the first bearing part; the drill rod unit includes a rod body module and a first channel; one end of the rod body module is fixedly connected to one end of the first bearing part; the outer diameter of the first bearing part is larger than the outer diameter of the rod body module; the first channel passes through the rod body module and the first bearing part along the axial direction of the rod body module; the connecting unit includes a connecting part, a second bearing part, a first transition part, and a second channel; one end of the connecting part is fixedly connected to one end of the second bearing part, and the other end is fixedly connected to one end of the first transition part, and the first transition part The other end of the first bearing part is fixedly connected to one end of the first bearing part; the connecting part is connected to the trousers unit; the second channel passes through the connecting part, the first transition part, and the second bearing part along the axial direction of the connecting part, one end of the second channel is connected to the first channel, and the other end is connected to the trousers unit and the rock drilling unit; when the drilling tool is in the first working state: one end of the first bearing part away from the rod body module abuts against the trousers unit, and one end of the second bearing part away from the connecting part abuts against one end of the rock drilling unit close to the trousers unit; when the drilling tool is in the second working state: one end of the first bearing part away from the rod body module abuts against the trousers unit, and one end of the second bearing part away from the connecting part is spaced apart from one end of the rock drilling unit close to the trousers unit.

[0010] In some embodiments, the first slag removal grooves are uniformly arranged at circumferential intervals along the first bearing portion; the sum of the projection areas of the first slag removal grooves perpendicular to the axis of the first bearing portion is S1, and the contact area between the first bearing portion and the trouser unit is S, wherein 1 / 4≤S1 / S≤1 / 3.

[0011] In some embodiments, the trousers unit includes a trousers module, a connecting groove, and a bearing ring; one end of the trousers module is fixedly connected to the rock drilling unit; the bearing ring is fixedly connected to the other end of the trousers module along the circumference of the trousers module; the connecting groove is recessed inwardly along the axial direction of the trousers module from one end of the trousers module close to the bearing ring; one end of the connecting groove is connected to one end of the second channel, and the other end is connected to the rock drilling unit; the trousers module is connected to the connecting part through the connecting groove; when the drilling tool is in the first working state: one end of the bearing ring away from the rock drilling unit abuts against one end of the first bearing part away from the rod module, and the second bearing part abuts against one end of the rock drilling unit close to the trousers module; when the drilling tool is in the second working state: one end of the bearing ring away from the rock drilling unit abuts against one end of the first bearing part away from the rod module, and the second bearing part is spaced apart from one end of the rock drilling unit close to the trousers module.

[0012] In some embodiments, the supporting ring includes a ring body and a second slag discharge groove; the ring body is fixedly connected to the trouser body module along the circumference of the trouser body module; the second slag discharge groove is recessed inward from a portion of the outer circumferential surface of the ring body along the radial direction of the ring body; the second slag discharge groove passes through the two end surfaces of the ring body.

[0013] In some embodiments, the trouser body module includes a trouser body portion and a plurality of third slag discharge grooves; one end of the trouser body portion is fixedly connected to the rock drilling unit, and the ring body is fixedly connected to the other end of the trouser body portion along the circumference of the trouser body portion; the connecting groove is recessed inwardly from one end of the trouser body portion close to the ring body along the axial direction of the trouser body portion; the trouser body portion is connected to the connecting portion; the third slag discharge grooves are recessed inwardly from part of the outer surface of the trouser body portion along the radial direction of the trouser body portion; the third slag discharge grooves are correspondingly connected to the second slag discharge grooves.

[0014] In some embodiments, the outer diameter of the first bearing portion is H1, and the outer diameter of the ring body is H2, wherein 0.7≤H1 / H2≤1.

[0015] In some embodiments, the trouser body is threadedly connected to the connecting portion; and the third slag discharge groove is spirally arranged along the axial direction of the trouser body.

[0016] In some embodiments, the rock drilling unit includes a rock drilling part, a second transition part, a third channel, a fourth channel, and a fourth slag discharge groove; one end of the second transition part is fixedly connected to one end of the rock drilling part, and the other end is fixedly connected to an end of the trouser body part close to the rock drilling part; the third channel passes through the second transition part and the rock drilling part along the axial direction of the second transition part; the end of the third channel away from the rock drilling part is connected to the second channel; one end of the fourth channel is connected to the third channel, and the other end passes through a portion of the outer surface of the rock drilling part; the fourth slag discharge groove is recessed inward from a portion of the outer surface of the rock drilling part along the radial direction of the rock drilling part; the fourth slag discharge groove is connected to the third slag discharge groove.

[0017] In order to solve the problem that the abutment between the drill bit and the drill rod of the existing stepped drilling tool is easy to break or fail during the rock drilling process of the drill bit, the present invention has the following advantages:

[0018] When the impact force applied to the rock drilling unit is greater than a first value, an end of the bearing unit close to the connecting unit abuts against an end of the trousers unit away from the rock drilling unit, and an end of the connecting unit away from the bearing unit abuts against an end of the rock drilling unit close to the trousers unit; when the impact force applied to the rock drilling unit is less than a second value, an end of the bearing unit close to the connecting unit abuts against an end of the trousers unit away from the rock drilling unit, and an end of the connecting unit away from the bearing unit is spaced apart from an end of the rock drilling unit close to the trousers unit; wherein the first value is greater than the second value, so that when the impact force applied to the rock drilling unit is greater than the first value, the impact force of the rock drilling unit on the bearing unit can be partially dispersed to the end of the connecting unit away from the bearing unit, so that the impact force applied to the bearing unit can be reduced, thereby solving the problem that the abutment between the drill bit and the drill rod of the existing stepped drilling tool is prone to breakage or failure during the rock drilling process of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The figure is a schematic diagram of the overall structure of a drilling tool;

[0020] Figure 2 It is a schematic diagram of the planar structure of the drill rod assembly;

[0021] Figure 3 for Figure 2 Right view of;

[0022] Figure 4 It is a schematic diagram of the planar structure of the drill bit assembly;

[0023] Figure 5 for Figure 4 Right view of;

[0024] Figure 6 is a schematic diagram of the structure of a drill bit assembly in some embodiments;

[0025] Figure 7 Schematic diagram of the structure of the drill bit assembly in some embodiments.

[0026] In the figure: 01, drill rod assembly; 11, rod unit; 111, rod module; 112, first channel; 12, bearing unit; 121, first bearing part; 122, first slag discharge groove; 13, connecting unit; 131, connecting part; 132, second bearing part; 133, first transition part; 134, second channel; 02, drill head assembly; 21, trousers unit; 211, trousers module; 2111, trousers part; 2112, third slag discharge groove; 212, connecting groove; 213, bearing ring; 2131, ring body; 2132, second slag discharge groove; 22, rock drilling unit; 221, rock drilling part; 222, second transition part; 223, third channel; 224, fourth channel; 225, fourth slag discharge groove. DETAILED DESCRIPTION

[0027] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0028] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0029] In order to solve the problem that the contact between the drill bit and the drill rod of the existing step-type drilling tool is easy to break or fail during the drilling process of the drill bit, the present invention provides a drilling tool, such as Figure 1 , Figure 2 , Figure 4 As shown, it may include:

[0030] The drill rod assembly 01 includes a drill rod unit, a bearing unit 12, and a connecting unit 13; one end of the bearing unit 12 is fixedly connected to one end of the drill rod unit, and the other end of the bearing unit 12 is fixedly connected to one end of the connecting unit 13;

[0031] A drill bit assembly 02, the drill bit assembly 02 comprises a trouser unit 21 and a rock drilling unit 22; one end of the trouser unit 21 is fixedly connected to one end of the rock drilling unit 22, and the trouser unit 21 is connected to the connecting unit 13;

[0032] The drilling tool includes a first working state and a second working state; the first working state includes: the impact force received by the rock drilling unit 22 is greater than a first value, the end of the bearing unit 12 close to the connecting unit 13 abuts against the end of the trouser unit 21 away from the rock drilling unit 22, and the end of the connecting unit 13 away from the bearing unit 12 abuts against the end of the rock drilling unit 22 close to the trouser unit 21; the second working state includes: the impact force received by the rock drilling unit 22 is less than a second value, the end of the bearing unit 12 close to the connecting unit 13 abuts against the end of the trouser unit 21 away from the rock drilling unit 22, and the end of the connecting unit 13 away from the bearing unit 12 is spaced apart from the end of the rock drilling unit 22 close to the trouser unit 21; wherein the first value is greater than the second value.

[0033] In this embodiment, if Figure 1 , Figure 2 , Figure 4 As shown, the stepped drill tool has a certain effect of reducing the force applied to the corrugated threaded connection between the drill bit and the drill rod during the rock drilling process of the drill bit. In this way, the stress concentration at the threaded connection between the drill bit and the drill rod is reduced. Among the existing rock drilling tools, the stepped drill tool has been widely used. However, when the existing stepped drill tool is subjected to axial impact force, the drill bit has a large impact force during operation. Under the impact of the high-frequency and large force of the drill bit, the abutment between the drill rod and the drill bit is prone to rupture or failure, thereby affecting the service life of the drill tool. The present invention provides a drill tool to solve the above-mentioned problems existing in the existing stepped drill tool, which may include:

[0034] The drill rod assembly 01 includes a drill rod unit, a bearing unit 12, and a connecting unit 13; one end of the bearing unit 12 is fixedly connected to one end of the drill rod unit, and the other end of the bearing unit 12 is fixedly connected to one end of the connecting unit 13;

[0035] The drill bit assembly 02 includes a body unit 21 and a rock drilling unit 22; one end of the body unit 21 is fixedly connected to one end of the rock drilling unit 22, and the body unit 21 is connected to the connecting unit 13; in the present embodiment, the connection method between the body unit 21 and the connecting unit 13 is preferably a corrugated thread connection method.

[0036] In addition, the drilling tool includes a first working state and a second working state; the first working state includes: the impact force received by the rock drilling unit 22 is greater than a first value, the end of the bearing unit 12 close to the connecting unit 13 abuts against the end of the trousers unit 21 away from the rock drilling unit 22, and the end of the connecting unit 13 away from the bearing unit 12 abuts against the end of the rock drilling unit 22 close to the trousers unit 21; the second working state includes: the impact force received by the rock drilling unit 22 is less than a second value, and the end of the bearing unit 12 close to the connecting unit 13 abuts against the trousers unit 21 The end away from the rock drilling unit 22 is abutted, and the end of the connecting unit 13 away from the bearing unit 12 is spaced from the end of the rock drilling unit 22 close to the trousers unit 21; wherein, the first value is greater than the second value, so that when the impact force exerted on the rock drilling unit 22 is greater than the first value, the impact force of the rock drilling unit 22 on the bearing unit 12 can be partially dispersed to the end of the connecting unit 13 away from the bearing unit 12, so that the impact force exerted on the bearing unit 12 can be reduced, thereby solving the problem that the abutment between the drill bit and the drill rod of the existing step-type drilling tool is easy to break or fail during the rock drilling process of the drill bit.

[0037] In this embodiment, the drilling tool also includes a third working state; the third working state includes: the impact force applied to the rock drilling unit 22 is greater than or equal to the second value and less than or equal to the first value, the end of the bearing unit 12 close to the connecting unit 13 abuts against the end of the trouser unit 21 away from the rock drilling unit 22, and the end of the rock drilling unit 22 close to the trouser unit 21 moves close to the connecting unit 13 and away from the bearing unit 12.

[0038] In this embodiment, in view of the error in the processing accuracy of the bearing unit 12, those skilled in the art will know that different parts of the surface where the bearing unit 12 abuts against the trouser body unit 21 may not be completely flush, which will result in that when the bearing unit 12 abuts against the trouser body unit 21, due to the excessive impact force on the rock drilling unit 22, when the impact force is transmitted to the bearing unit 12, the bearing unit 12 will have local stress protrusion, thereby causing damage or failure to the abutting surface between the bearing unit 12 and the trouser body unit 21. By setting the drilling tool to a working state where, when the impact force on the rock drilling unit 22 is greater than the first value, the end of the bearing unit 12 close to the connecting unit 13 abuts against the end of the trouser body unit 21 away from the rock drilling unit 22, and the end of the connecting unit 13 away from the bearing unit 12 abuts against the end of the rock drilling unit 22 close to the trouser body unit 21, the change of stress when the bearing unit 12 abuts against the trouser body unit 21 can be reduced, thereby achieving the purpose of protecting the bearing unit 12.

[0039] In some embodiments, Figure 1As shown, when the drilling tool is in the second working state, the distance between the end of the connecting unit 13 away from the bearing unit 12 and the end of the rock drilling unit 22 close to the trousers unit 21 is K, wherein 0.2mm≤K≤0.5mm.

[0040] In this embodiment, if Figure 1 As shown, when the drilling tool is in the second working state, the distance between the end of the connecting unit 13 away from the bearing unit 12 and the end of the rock drilling unit 22 close to the trousers unit 21 is K, wherein 0.2mm≤K≤0.5mm. By setting the value of K between 0.2mm and 0.5mm, it is possible to avoid that the value of K is too large, resulting in the first value being too large when the drilling tool reaches the first working state, so that when the end of the bearing unit 12 close to the connecting unit 13 abuts against the end of the trousers unit 21 away from the rock drilling unit 22, the bearing unit 12 will be subjected to a large abutting force. Moreover, it is known to those skilled in the art that when the value of K is too large, there is a situation where the end of the bearing unit 12 close to the connecting unit 13 and the end of the trousers unit 21 away from the rock drilling unit 22 are broken or failed, and the end of the connecting unit 13 away from the bearing unit 12 cannot abut against the end of the rock drilling unit 22 close to the trousers unit 21. By setting the value of K between 0.2 mm and 0.5 mm, it is possible to avoid the situation where the end of the bearing unit 12 close to the connecting unit 13 and the end of the trouser unit 21 away from the rock drilling unit 22 are broken or fail when the value of K is too large, and to avoid the situation where the end of the connecting unit 13 away from the bearing unit 12 cannot abut against the end of the rock drilling unit 22 close to the trouser unit 21. Preferably, the value of K can be 0.3 mm.

[0041] In some embodiments, Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the bearing unit 12 includes a first bearing portion 121 and a plurality of first slag discharge grooves 122; the first slag discharge grooves 122 are recessed from a portion of the outer circumferential surface of the first bearing portion 121 along the radial direction of the first bearing portion 121; the first slag discharge grooves 122 penetrate the two end surfaces of the first bearing portion 121 along the axial direction of the first bearing portion 121; the drill rod unit includes a rod body module 111 and a first channel 112; one end of the rod body module 111 is fixedly connected to one end of the first bearing portion 121; the outer diameter of the first bearing portion 121 is greater than the outer diameter of the rod body module 111; the first channel 112 penetrates the rod body module 111 and the first bearing portion 121 along the axial direction of the rod body module 111; the connecting unit 13 includes a connecting portion 131, a second bearing portion 132, a first transition portion 133, and a second channel 134; one end of the connecting portion 131 is fixedly connected to one end of the second bearing portion 132, and the other end is fixedly connected to one end of the first transition portion 133. The other end of the part 133 is fixedly connected to one end of the first bearing part 121; the connecting part 131 is connected to the trousers unit 21; the second channel 134 passes through the connecting part 131, the first transition part 133, and the second bearing part 132 along the axial direction of the connecting part 131, one end of the second channel 134 is connected to the first channel 112, and the other end is connected to the trousers unit 21 and the rock drilling unit 22; when the drilling tool is in the first working state: the end of the first bearing part 121 away from the rod body module 111 abuts against the trousers unit 21, and the end of the second bearing part 132 away from the connecting part 131 abuts against an end of the rock drilling unit 22 close to the trousers unit 21; when the drilling tool is in the second working state: the end of the first bearing part 121 away from the rod body module 111 abuts against the trousers unit 21, and the end of the second bearing part 132 away from the connecting part 131 is spaced apart from an end of the rock drilling unit 22 close to the trousers unit 21.

[0042] In this embodiment, if Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the bearing unit 12 includes a first bearing part 121 and a plurality of first slag discharge grooves 122; the first slag discharge grooves 122 are recessed inwardly from a portion of the outer circumference of the first bearing part 121 along the radial direction of the first bearing part 121; the first slag discharge grooves 122 penetrate both end surfaces of the first bearing part 121 along the axial direction of the first bearing part 121; by arranging a plurality of first slag discharge grooves 122 on the first bearing part 121, and preferably, the first slag discharge grooves 122 can be evenly arranged on the first bearing part 121 along the circumferential direction of the first bearing part 121. By arranging the first slag discharge grooves 122, a regular discharge channel can be formed during the drilling process of the drill, so that at least part of the excrement in the borehole can be evenly discharged from the first slag discharge grooves 122, reducing the disturbance of the excrement in the borehole and reducing the resistance encountered by the drill when drilling. In some cases, a plurality of first slag discharge grooves 122 are provided on the first bearing portion 121, and the compressive resistance of the first bearing portion 121 along the axial direction will be reduced. When the impact force applied to the rock drilling unit 22 is greater than a first value, an end of the first bearing portion 121 close to the connecting unit 13 abuts against an end of the body unit 21 away from the rock drilling unit 22, and an end of the connecting unit 13 away from the bearing unit 12 abuts against an end of the rock drilling unit 22 close to the body unit 21, which can reduce the pressure applied to the first bearing portion 121 along its axial direction, thereby avoiding the reduction of its compressive strength, rupture or failure due to the provision of a plurality of first slag discharge grooves 122 on the first bearing portion 121.

[0043] The brazing rod unit includes a rod module 111 and a first channel 112; one end of the rod module 111 is fixedly connected to one end of the first bearing part 121; the outer diameter of the first bearing part 121 is larger than the outer diameter of the rod module 111; the first channel 112 penetrates the rod module 111 and the first bearing part 121 along the axial direction of the rod module 111; the connecting unit 13 includes a connecting part 131, a second bearing part 132, a first transition part 133, and a second channel 134; one end of the connecting part 131 is fixedly connected to one end of the second bearing part 132, and the other end is fixedly connected to one end of the first transition part 133, and the other end of the first transition part 133 is fixedly connected to one end of the first bearing part 121; the connecting part 131 is connected to the trousers unit 21; the second channel 134 is connected along the The connecting portion 131 axially passes through the connecting portion 131, the first transition portion 133, and the second bearing portion 132; one end of the second channel 134 is connected to the first channel 112, and the other end is connected to the trouser unit 21 and the rock drilling unit 22; when the drilling tool is in the first working state: one end of the first bearing portion 121 away from the rod body module 111 abuts against the trouser unit 21, and one end of the portion 132 away from the connecting portion 131 abuts against one end of the rock drilling unit 22 close to the trouser unit 21; when the drilling tool is in the second working state: one end of the first bearing portion 121 away from the rod body module 111 abuts against the trouser unit 21, and one end of the second bearing portion 132 away from the connecting portion 131 is spaced apart from one end of the rock drilling unit 22 close to the trouser unit 21. In this embodiment, one end of the second channel 134 is connected to the first channel 112, and the other end is connected to the trouser unit 21 and the rock drilling unit 22, and the rock drilling unit 22 is connected to the outside. When drilling operation is performed, the fluid inside the drill bit can be sprayed out from the rock drilling unit 22 through the first channel 112 and the second channel 134, and then at least part of the excrement is discharged from the first slag discharge trough 122.

[0044] In some embodiments, the first slag removal grooves 122 are uniformly arranged at circumferential intervals along the first bearing portion 121; the sum of the projection areas of the first slag removal grooves 122 perpendicular to the axis of the first bearing portion 121 is S1, and the contact area between the first bearing portion 121 and the trouser unit 21 is S, wherein 1 / 4≤S1 / S≤1 / 3.

[0045] In this embodiment, by setting the ratio of the sum of the projected areas of the first slag discharge groove 122 perpendicular to the axis of the first bearing part 121 to the cross-sectional area of ​​the first bearing part 121 between 1 / 4 and 1 / 3, the ratio of the cross-section of the first slag discharge groove 122 to the abutment area between the first bearing part 121 and the trouser body unit 21 is at a more reasonable value, which can not only ensure that the first slag discharge groove 122 has a better slag discharge effect, but also avoid excessive reduction in the compressive strength of the first bearing part 121 due to the setting of the first slag discharge groove 122, resulting in the first bearing part 121 being broken or failed when subjected to a large impact force along its axial direction.

[0046] In some embodiments, Figure 1 , Figure 4 , Figure 5 As shown, the trousers unit 21 includes a trousers module 211, a connecting groove 212, and a bearing ring 213; one end of the trousers module 211 is fixedly connected to the rock drilling unit 22; the bearing ring 213 is fixedly connected to the other end of the trousers module 211 along the circumference of the trousers module 211; the connecting groove 212 is recessed inwardly along the axial direction of the trousers module 211 from one end of the trousers module 211 close to the bearing ring 213; one end of the connecting groove 212 is connected to one end of the second channel 134, and the other end is connected to the rock drilling unit 22; the trousers module 211 is connected to the rock drilling unit 22 through the connecting groove 212 The connecting part 131 is connected; when the drilling tool is in the first working state: the end of the bearing ring 213 away from the rock drilling unit 22 abuts against the end of the first bearing part 121 away from the rod body module 111, and the second bearing part 132 abuts against the end of the rock drilling unit 22 close to the trousers module 211; when the drilling tool is in the second working state: the end of the bearing ring 213 away from the rock drilling unit 22 abuts against the end of the first bearing part 121 away from the rod body module 111, and the second bearing part 132 is spaced apart from the end of the rock drilling unit 22 close to the trousers module 211.

[0047] In this embodiment, if Figure 1 , Figure 4 , Figure 5As shown, the trouser unit 21 includes a trouser module 211, a connecting groove 212, and a bearing ring 213; one end of the trouser module 211 is fixedly connected to the rock drilling unit 22; the bearing ring 213 is fixedly connected to the other end of the trouser module 211 along the circumference of the trouser module 211; the connecting groove 212 is recessed inwardly along the axial direction of the trouser module 211 from one end of the trouser module 211 close to the bearing ring 213; one end of the connecting groove 212 is connected to one end of the second channel 134, and the other end is connected to the rock drilling unit 22; the trouser module 211 is connected to the connecting portion 131; in this embodiment, the outer circumferential surface of the trouser module 211 and the outer circumferential surface of the connecting groove 212 are respectively provided with corrugated threads, and the trouser module 211 is threadedly connected to the connecting portion 131 through the connecting groove 212.

[0048] When the drilling tool is in the first working state: the end of the bearing ring 213 away from the rock drilling unit 22 abuts against the end of the first bearing part 121 away from the rod body module 111, and the second bearing part 132 abuts against the rock drilling unit 22; when the drilling tool is in the second working state: the end of the bearing ring 213 away from the rock drilling unit 22 abuts against the end of the first bearing part 121 away from the rod body module 111, and the second bearing part 132 is spaced from the rock drilling unit 22. In this embodiment, by providing the bearing ring 213, the impact resistance of the trousers module 211 along the axial direction at the first bearing part 121 can be increased, and as a preferred embodiment, the bearing ring 213 can be formed integrally with the trousers module 211.

[0049] In some embodiments, Figure 4 , Figure 5 As shown, the supporting ring 213 includes a ring body 2131 and a second slag discharge groove 2132; the ring body 2131 is fixedly connected to the trouser body module 211 along the circumference of the trouser body module 211; the second slag discharge groove 2132 is recessed inwardly from a part of the outer circumferential surface of the ring body 2131 along the radial direction of the ring body 2131; the second slag discharge groove 2132 passes through the two end surfaces of the ring body 2131.

[0050] In this embodiment, if Figure 4 , Figure 5As shown, the supporting ring 213 includes a ring body 2131 and a second slag discharge groove 2132; the ring body 2131 is fixedly connected to the trouser body module 211 along the circumference of the trouser body module 211; the second slag discharge groove 2132 is recessed from a part of the outer circumferential surface of the ring body 2131 along the radial direction of the ring body 2131; the second slag discharge groove 2132 passes through the two end surfaces of the ring body 2131, and by setting the second slag discharge groove 2132, and the second slag discharge groove 2132 is preferably evenly arranged on the ring body 2131, when the connecting part 131 is threadedly connected to the trouser body module 211, the first slag discharge groove 122 is at least partially connected to the second slag discharge groove 2132, so that at least part of the slag in the drilled hole can be discharged from the first slag discharge groove 122 through the second slag discharge groove 2132. Preferably, the second slag discharge groove 2132 can be selected to be connected to the first slag discharge groove 122.

[0051] In some embodiments, Figure 1 , Figure 6 , Figure 7 As shown, the trouser body module 211 includes a trouser body portion 2111 and a plurality of third slag discharge grooves 2112; one end of the trouser body portion 2111 is fixedly connected to the rock drilling unit 22, and the ring body 2131 is fixedly connected to the other end of the trouser body portion 2111 along the circumference of the trouser body portion 2111; the connecting groove 212 is recessed inwardly from one end of the trouser body portion 2111 close to the ring body 2131 along the axial direction of the trouser body portion 2111; the trouser body portion 2111 is connected to the connecting portion 131; the third slag discharge grooves 2112 are recessed inwardly from part of the outer surface of the trouser body portion 2111 along the radial direction of the trouser body portion 2111; the third slag discharge grooves 2112 are correspondingly connected to the second slag discharge grooves 2132.

[0052] In this embodiment, if Figure 1 , Figure 6 , Figure 7As shown, the trousers module 211 includes a trousers portion 2111 and a plurality of third slag discharge grooves 2112; the third slag discharge grooves 2112 can be used as slag discharge channels, one end of the trousers portion 2111 is fixedly connected to the rock drilling unit 22, and the ring body 2131 is fixedly connected to the other end of the trousers portion 2111 along the circumference of the trousers portion 2111; the connecting groove 212 is concave inwardly from one end of the trousers portion 2111 close to the ring body 2131 along the axial direction of the trousers portion 2111; in order to avoid the trousers portion 2111 being damaged due to the third slag discharge grooves 2112 being provided on the trousers portion 2111 The compressive strength of 2111 in the axial direction is reduced. Those skilled in the art can know that the thickness of the trouser body 2111 can be increased accordingly, so as to avoid the situation that the compressive strength of the trouser body 2111 in the axial direction is reduced after the third slag discharge groove 2112 is set on the trouser body 2111; the trouser body 2111 is connected to the connecting part 131 through the connecting groove 212; the third slag discharge groove 2112 is recessed inward from part of the outer surface of the trouser body 2111 along the radial direction of the trouser body 2111; the third slag discharge groove 2112 is correspondingly connected to the second slag discharge groove 2132. The third slag discharge groove 2112 is connected to the second slag discharge groove 2132, and a smooth transition can be set at the connection point to reduce the resistance of the slag discharge in the first slag discharge groove 122 or the second slag discharge groove 2132.

[0053] In some embodiments, the outer diameter of the first bearing portion 121 is H1, and the outer diameter of the ring body 2131 is H2, wherein 0.7≤H1 / H2≤1.

[0054] In this embodiment, the outer diameter of the first bearing portion 121 is H1, and the outer diameter of the ring body 2131 is H2, wherein 0.7≤H1 / H2≤1. By setting the outer diameter of the first bearing portion 121 to be smaller than the outer diameter of the ring body 2131, the resistance encountered by the excrement in the borehole when discharged from the borehole can be reduced, so that the excrement is discharged more smoothly. In this embodiment, the outer diameter of the ring body 2131 is set to be smaller than the outer diameter of the part of the rock drilling unit 22 used for rock drilling.

[0055] In some embodiments, Figure 1 , Figure 7 As shown, the body portion 2111 is threadedly connected to the connecting portion 131 ; the third slag discharge groove 2112 is spirally arranged along the axial direction of the body portion 2111 .

[0056] In this embodiment, if Figure 1 , Figure 7As shown, by spirally arranging the third slag discharge groove 2112 along the axial direction of the trouser body 2111, at least part of the high-pressure excrement is discharged from the first slag discharge groove through the third slag discharge groove 2112 and the second slag discharge groove 2132. In the process of drilling with a drill, in some cases, because the drill is a left-handed high-frequency impact, the trouser body 2111 rotates synchronously with a high-frequency. During the rotation process, the excrement and the mass points on the trouser body 2111 form a relative displacement relationship, that is, in order to ensure the smooth discharge of excrement, the second slag discharge groove 2132 and the third slag discharge groove 2112 can be designed as a left-handed structure. When the drill bit assembly 02 rotates counterclockwise at a high frequency, since the third slag discharge groove is spirally arranged at a certain angle on the body portion 2111, the high-pressure fluid containing excrement in the third slag discharge groove will form a force on the body portion 2111 along the circumferential direction of the body portion 2111. In order to avoid the weakening of the threaded connection between the body portion 2111 and the connecting portion 131 due to the force, in this embodiment, the rotation direction of the third slag discharge groove is preferably the same as the rotation direction of the drill tool in the working state, and the threaded connection relationship between the body portion 2111 and the connecting portion 131 is designed to be able to rotate with the drill tool during the rock drilling process of the drill tool and to further enhance the threaded connection under the action of excrement in the third slag discharge groove 2112, thereby reducing the resistance encountered by the body portion 2111 during rotation and avoiding the weakening of the threaded connection relationship with the connecting portion 131 during rotation. In this embodiment, since the third slag discharge groove 2112 is spirally arranged, at least part of the excrement in the borehole rotates at a certain speed and is discharged from the borehole when the drill is working, thereby increasing the cleaning range of the hole wall and better flushing out the excrement attached to the hole wall.

[0057] In some embodiments, Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the rock drilling unit 22 includes a rock drilling part 221, a second transition part 222, a third channel 223, a fourth channel 224, and a fourth slag discharge groove 225; one end of the second transition part 222 is fixedly connected to one end of the rock drilling part 221, and the other end is fixedly connected to one end of the trouser body part 2111 close to the rock drilling part 221; the third channel 223 penetrates the second transition part 222 and the rock drilling part 221 along the axial direction of the second transition part 222; the end of the third channel 223 away from the rock drilling part 221 is connected to the second channel 134; one end of the fourth channel 224 is connected to the third channel 223, and the other end penetrates a part of the outer surface of the rock drilling part 221; the fourth slag discharge groove 225 is recessed inward from a part of the outer surface of the rock drilling part 221 along the radial direction of the rock drilling part 221, and the fourth slag discharge groove 225 is connected to the third slag discharge groove 2112.

[0058] In this embodiment, if Figure 4, Figure 5 , Figure 6 , Figure 7 As shown, the rock drilling unit 22 includes a rock drilling part 221, a second transition part 222, a third channel 223, a fourth channel 224, and a fourth slag discharge groove 225; one end of the second transition part 222 is fixedly connected to one end of the rock drilling part 221, and the other end is fixedly connected to one end of the trouser body part 2111 close to the rock drilling part 221; the third channel 223 penetrates the second transition part 222 and the rock drilling part 221 along the axis direction of the second transition part 222; the end of the third channel 223 away from the rock drilling part 221 is connected to the second channel 134; in this embodiment, the number of the third channels 223 can be set as needed. One end of the fourth channel 224 is connected to the third channel 223, and the other end penetrates part of the outer surface of the rock drilling part 221; the fourth slag discharge groove 225 is recessed from part of the outer surface of the rock drilling part 221 along the radial direction of the rock drilling part 221, and the fourth slag discharge groove 225 is connected to the third slag discharge groove 2112. In this embodiment, one end of the fourth channel 224 is connected to the third channel 223, and the other end can also be arranged to be connected to the end of the rock drilling part 221 away from the second transition part 222. By setting the third channel 223 and the fourth channel 224, the high-speed fluid jet range in the drill tool can be expanded, and the excrement can be discharged from the borehole more comprehensively. In addition, by setting the fourth slag discharge groove 225, the fourth slag discharge groove 225 is connected to the third slag discharge groove 2112, so that at least part of the excrement can have a better discharge channel, reducing the resistance encountered by the excrement when it is discharged from the borehole.

[0059] In the above embodiments, the excrement includes but is not limited to dust, gravel, a mixture of gravel and dust, and a mixture of gravel, water and dust; the fluid includes water or air or a mixture of water and air.

[0060] The working principle of the present invention is:

[0061] When the drilling tool is drilling, if the impact force received by the rock drilling unit 22 is greater than a first value, the end of the bearing unit 12 close to the connecting unit 13 abuts against the end of the trousers unit 21 away from the rock drilling unit 22, and the end of the connecting unit 13 away from the bearing unit 12 abuts against the end of the rock drilling unit 22 close to the trousers unit 21; when the impact force received by the rock drilling unit 22 is less than a second value, the end of the bearing unit 12 close to the connecting unit 13 abuts against the end of the trousers unit 21 away from the rock drilling unit 22, and the end of the connecting unit 13 away from the bearing unit 12 abuts against the end of the rock drilling unit 22 close to the trousers unit 21.

[0062] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A drilling tool, characterized in that: The drilling tool comprises: A drill rod assembly, the drill rod assembly comprising a drill rod unit, a bearing unit, and a connecting unit; one end of the bearing unit is fixedly connected to one end of the drill rod unit, and the other end is fixedly connected to one end of the connecting unit; A drill bit assembly, the drill bit assembly comprising a trousers unit and a rock drilling unit; one end of the trousers unit is fixedly connected to one end of the rock drilling unit, and the trousers unit is connected to the connecting unit; The drilling tool includes a first working state and a second working state; the first working state includes: the impact force received by the rock drilling unit is greater than a first value, an end of the bearing unit close to the connecting unit abuts against an end of the trouser unit away from the rock drilling unit, and an end of the connecting unit away from the bearing unit abuts against an end of the rock drilling unit close to the trouser unit; the second working state includes: the impact force received by the rock drilling unit is less than a second value, an end of the bearing unit close to the connecting unit abuts against an end of the trouser unit away from the rock drilling unit, and an end of the connecting unit away from the bearing unit is spaced apart from an end of the rock drilling unit close to the trouser unit; wherein the first value is greater than the second value.

2. A drilling tool according to claim 1, characterized in that: When the drilling tool is in the second working state, the distance between the end of the connecting unit away from the bearing unit and the end of the rock drilling unit close to the trousers unit is K, wherein 0.2mm≤K≤0.5mm.

3. A drilling tool according to claim 1, characterized in that: The bearing unit includes a first bearing part and a plurality of first slag discharge grooves; the first slag discharge groove is recessed inwardly from a part of the outer circumferential surface of the first bearing part along the radial direction of the first bearing part; the first slag discharge groove passes through the two end surfaces of the first bearing part along the axial direction of the first bearing part; the drill rod unit includes a rod body module and a first channel; one end of the rod body module is fixedly connected to one end of the first bearing part; the outer diameter of the first bearing part is larger than the outer diameter of the rod body module; the first channel passes through the rod body module and the first bearing part along the axial direction of the rod body module; the connecting unit includes a connecting part, a second bearing part, a first transition part, and a second channel; one end of the connecting part is fixedly connected to one end of the second bearing part, and the other end is fixedly connected to one end of the first transition part, and the other end of the first transition part The second bearing part is fixedly connected to one end of the first bearing part; the connecting part is connected to the trousers unit; the second channel passes through the connecting part, the first transition part and the second bearing part along the axial direction of the connecting part, one end of the second channel is connected to the first channel, and the other end is connected to the trousers unit and the rock drilling unit; when the drilling tool is in the first working state: one end of the first bearing part away from the rod body module abuts against the trousers unit, and one end of the second bearing part away from the connecting part abuts against one end of the rock drilling unit close to the trousers unit; when the drilling tool is in the second working state: one end of the first bearing part away from the rod body module abuts against the trousers unit, and one end of the second bearing part away from the connecting part is spaced apart from one end of the rock drilling unit close to the trousers unit.

4. A drilling tool according to claim 3, characterized in that: The first slag removal grooves are evenly spaced along the circumference of the first bearing part; the sum of the projection areas of the first slag removal grooves perpendicular to the axis of the first bearing part is S1, and the contact area between the first bearing part and the trouser unit is S, wherein 1 / 4≤S1 / S≤1 / 3.

5. A drilling tool according to claim 4, characterized in that: The trousers unit includes a trousers module, a connecting groove, and a bearing ring; one end of the trousers module is fixedly connected to the rock drilling unit; the bearing ring is fixedly connected to the other end of the trousers module along the circumference of the trousers module; the connecting groove is recessed inwardly along the axial direction of the trousers module from one end of the trousers module close to the bearing ring; one end of the connecting groove is connected to one end of the second channel, and the other end is connected to the rock drilling unit; the trousers module is connected to the connecting part through the connecting groove; when the drilling tool is in the first working state: one end of the bearing ring away from the rock drilling unit abuts against one end of the first bearing part away from the rod module, and the second bearing part abuts against one end of the rock drilling unit close to the trousers module; when the drilling tool is in the second working state: one end of the bearing ring away from the rock drilling unit abuts against one end of the first bearing part away from the rod module, and the second bearing part is spaced apart from one end of the rock drilling unit close to the trousers module.

6. A drilling tool according to claim 5, characterized in that: The supporting ring includes a ring body and a second slag discharge groove; the ring body is fixedly connected to the trouser body module along the circumference of the trouser body module; the second slag discharge groove is recessed inwardly from a part of the outer circumferential surface of the ring body along the radial direction of the ring body; the second slag discharge groove passes through the two end surfaces of the ring body.

7. A drilling tool according to claim 6, characterized in that: The trouser body module includes a trouser body part and a plurality of third slag discharge grooves; one end of the trouser body part is fixedly connected to the rock drilling unit, and the ring body is fixedly connected to the other end of the trouser body part along the circumference of the trouser body part; the connecting groove is recessed inwardly from one end of the trouser body part close to the ring body along the axial direction of the trouser body part; the trouser body part is connected to the connecting part; the third slag discharge groove is recessed inwardly from part of the outer surface of the trouser body part along the radial direction of the trouser body part; the third slag discharge groove is correspondingly connected to the second slag discharge groove.

8. A drilling tool according to claim 6, characterized in that: The outer diameter of the first bearing portion is H1, and the outer diameter of the ring body is H2, wherein 0.7≤H1 / H2≤1.

9. A drilling tool according to claim 7, characterized in that: The trouser body is threadedly connected to the connecting portion; and the third slag discharge groove is spirally arranged along the axial direction of the trouser body.

10. A drilling tool according to claim 7 or 9, characterized in that: The rock drilling unit includes a rock drilling part, a second transition part, a third channel, a fourth channel, and a fourth slag discharge groove; one end of the second transition part is fixedly connected to one end of the rock drilling part, and the other end is fixedly connected to one end of the trouser body part close to the rock drilling part; the third channel passes through the second transition part and the rock drilling part along the axial direction of the second transition part; the end of the third channel away from the rock drilling part is connected to the second channel; one end of the fourth channel is connected to the third channel, and the other end passes through a part of the outer surface of the rock drilling part; the fourth slag discharge groove is recessed inward from a part of the outer surface of the rock drilling part along the radial direction of the rock drilling part; the fourth slag discharge groove is connected to the third slag discharge groove.

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