A drill

Abstract

The present application relates to the technical field of drilling tools, and in particular relates to a drilling tool. The drilling tool comprises a drill rod assembly and a drill head assembly. The drilling tool comprises a first working state and a second working state. In the first working state, the impact force on the rock drilling unit is greater than a first value, the end of the load bearing unit close to the connecting unit is in abutment with the end of the pant body unit away from the rock drilling unit, and the end of the connecting unit away from the load bearing unit is in abutment with the end of the rock drilling unit close to the pant body unit. In the second working state, the impact force on the rock drilling unit is less than a second value, the end of the load bearing unit close to the connecting unit is in abutment with the end of the pant body unit away from the rock drilling unit, and the end of the connecting unit away from the load bearing unit is spaced apart from the end of the rock drilling unit close to the pant body unit. The first value is greater than the second value. Thus, the problem that the abutment between the drill head and the drill rod of the existing step-type drilling tool is prone to breakage or failure during rock drilling by the drill head is solved.

Description

Technical Field

[0001] This invention relates to the field of drilling tools, and more specifically, to a drilling tool. Background Technology

[0002] Drilling tools are mainly composed of a drill rod and a drill bit. The drill bit is used to break the rock mass, while the drill rod is used to transmit power. Power is transmitted to the drill bit through the drill rod, enabling the drill bit to break the rock mass for drilling. During the drilling process, the rock mass also exerts a reaction force on the drill bit, which is then transmitted from the drill bit to the drill rod. However, the force transmission at the connection between the drill bit and the drill rod is not homogeneous, resulting in significant force variations. During prolonged drilling, the connection between the drill bit and the drill rod is most prone to damage. Therefore, improving the stress conditions at the connection between the drill bit and the drill rod is a key factor in extending the life of the drilling tool.

[0003] Existing drill rod and drill bit connection methods have evolved from bottom-punch corrugated thread connections to stepped corrugated thread connections. Stepped drill bits offer some reduction in the force exerted on the drill bit at the corrugated thread connection during rock drilling. However, when subjected to axial impact forces, the drill bit experiences significant impact during operation. Under the high-frequency, high-force impact of the drill bit, the contact point between the drill rod and drill bit is prone to breakage or failure, thus affecting the service life of the drill bit. Summary of the Invention

[0004] To address the problem that the contact point between the drill bit and drill rod in existing stepped drill tools is prone to breakage or failure during rock drilling, this invention provides a drill tool comprising:

[0005] A drill rod assembly, comprising a drill rod unit, a support unit, and a connecting unit; one end of the support 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, comprising a pant body unit and a rock drilling unit; one end of the pant body unit is fixedly connected to one end of the rock drilling unit, and the pant body 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, the end of the bearing unit near the connecting unit abuts against the end of the trouser body unit away from the rock drilling unit, and the end of the connecting unit away from the bearing unit abuts against the end of the rock drilling unit near the trouser body unit; the second working state includes: the impact force received by the rock drilling unit is less than a second value, the end of the bearing unit near the connecting unit abuts against the end of the trouser body unit away from the rock drilling unit, and the end of the connecting unit away from the bearing unit and the end of the rock drilling unit near the trouser body unit are spaced apart; wherein, the first value is greater than the second value.

[0008] In some embodiments, when the drill bit 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 body unit is K, where 0.2mm≤K≤0.5mm.

[0009] In some embodiments, the supporting unit includes a first supporting portion and a plurality of first slag discharge channels; the first slag discharge channels are recessed radially inward from a portion of the outer peripheral surface of the first supporting portion; the first slag discharge channels penetrate both end faces of the first supporting portion along its axial direction; 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 supporting portion; the outer diameter of the first supporting portion is larger than the outer diameter of the rod body module; the first channel penetrates the rod body module and the first supporting portion along its axial direction; the connecting unit includes a connecting portion, a second supporting portion, a first transition portion, and a second channel; one end of the connecting portion is fixedly connected to one end of the second supporting portion, and the other end is fixedly connected to one end of the first transition portion, the first transition portion... The other end is fixedly connected to one end of the first bearing part; the connecting part is connected to the trouser body 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 trouser body unit and the rock drilling unit; when the drill bit is in the first working state: the end of the first bearing part away from the rod module abuts against the trouser body unit, and the end of the second bearing part away from the connecting part abuts against the end of the rock drilling unit close to the trouser body unit; when the drill bit is in the second working state: the end of the first bearing part away from the rod module abuts against the trouser body unit, and the end of the second bearing part away from the connecting part is spaced apart from the end of the rock drilling unit close to the trouser body unit.

[0010] In some embodiments, the first slag discharge troughs are evenly spaced along the circumference of the first bearing portion; the sum of the projected areas of the first slag discharge troughs perpendicular to the axis of the first bearing portion is S1, and the contact area between the first bearing portion and the trouser body unit is S, wherein 1 / 4≤S1 / S≤1 / 3.

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

[0012] In some embodiments, the bearing 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 from a portion of the outer circumferential surface of the ring body inward along the radial direction of the ring body; the second slag discharge groove penetrates both end faces of the ring body.

[0013] In some embodiments, the trouser body module includes a trouser body portion and a plurality of third slag discharge troughs; 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 inward from one end of the trouser body portion near 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 trough is recessed inward from a portion of the outer surface of the trouser body portion along the radial direction of the trouser body portion; the third slag discharge trough is correspondingly connected to the second slag discharge trough.

[0014] In some embodiments, the outer diameter of the first support 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; the third slag discharge trough is spirally arranged along the axial direction of the trouser body.

[0016] In some embodiments, the rock drilling unit includes a rock drilling section, a second transition section, a third channel, a fourth channel, and a fourth slag discharge trough; one end of the second transition section is fixedly connected to one end of the rock drilling section, and the other end is fixedly connected to one end of the body section near the rock drilling section; the third channel penetrates the second transition section and the rock drilling section along the axial direction of the second transition section; one end of the third channel away from the rock drilling section is connected to the second channel; one end of the fourth channel is connected to the third channel, and the other end penetrates a portion of the outer surface of the rock drilling section; the fourth slag discharge trough is recessed radially inward from a portion of the outer surface of the rock drilling section; the fourth slag discharge trough is connected to the third slag discharge trough.

[0017] To address the problem that the contact point between the drill bit and drill rod in existing stepped drill tools is prone to breakage or failure during rock drilling, this invention offers the following advantages:

[0018] When the impact force on the rock drilling unit is greater than a first value, the end of the bearing unit near the connecting unit abuts against the end of the trouser unit away from the rock drilling unit, and the end of the connecting unit away from the bearing unit abuts against the end of the rock drilling unit near the trouser unit. When the impact force on the rock drilling unit is less than a second value, the end of the bearing unit near the connecting unit abuts against the end of the trouser unit away from the rock drilling unit, and the end of the connecting unit away from the bearing unit and the end of the rock drilling unit near the trouser unit are spaced apart. Wherein, the first value is greater than the second value, so that when the impact force on 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, thereby reducing the impact force on the bearing unit and solving the problem that the abutment of the drill bit and drill rod of the existing stepped drill bit is prone to breakage or failure during the rock drilling process. Attached Figure Description

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

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

[0021] Figure 3 for Figure 2 The right view;

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

[0023] Figure 5 for Figure 4 The right view;

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

[0025] Figure 7 This is a schematic diagram of the drill bit assembly in some embodiments.

[0026] In the diagram: 01, Drill rod assembly; 11, Rod body unit; 111, Rod body module; 112, First channel; 12, Bearing unit; 121, First bearing part; 122, First slag discharge trough; 13, Connecting unit; 131, Connecting part; 132, Second bearing part; 133, First transition part; 134, Second channel; 02, Drill bit assembly; 21, Pants body unit; 211, Pants body module; 2111, Pants body part; 2112, Third slag discharge trough; 212, Connecting groove; 213, Bearing ring; 2131, Ring body; 2132, Second slag discharge trough; 22, Rock drilling unit; 221, Rock drilling part; 222, Second transition part; 223, Third channel; 224, Fourth channel; 225, Fourth slag discharge trough. Detailed Implementation

[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, and are not intended to imply any limitation on the scope of the disclosure.

[0028] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based 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 terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. 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 a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, 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 or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0029] To address the problem of easy breakage or failure at the joint between the drill bit and drill rod in existing stepped drill tools during rock drilling, this invention provides a drill 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 support unit 12, and a connecting unit 13; one end of the support unit 12 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 13.

[0031] The drill bit assembly 02 includes a pant body unit 21 and a rock drilling unit 22; one end of the pant body unit 21 is fixedly connected to one end of the rock drilling unit 22, and the pant body 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 near 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 near the trouser body 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 near 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 is spaced apart from the end of the rock drilling unit 22 near the trouser body unit 21; wherein, the first value is greater than the second value.

[0033] In this embodiment, as Figure 1 , Figure 2 , Figure 4 As shown, stepped drilling tools have the effect of reducing the force on the drill bit and drill rod threaded connection during rock drilling. This reduces stress concentration at the drill bit and drill rod threaded connection, and stepped drilling tools are widely used in existing rock drilling tools. However, when subjected to axial impact force, existing stepped drilling tools are prone to breakage or failure at the drill rod and drill bit connection due to the large impact force generated by the drill bit during operation, under the high-frequency and large force of the drill bit, thus affecting the service life of the drilling tool. This invention provides a drilling tool to solve the above-mentioned problems of existing stepped drilling tools, which may include:

[0034] The drill rod assembly 01 includes a drill rod unit, a support unit 12, and a connecting unit 13; one end of the support unit 12 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 13.

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

[0036] Furthermore, the drill bit 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 near the connecting unit 13 abuts against the end of the pant 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 near the pant body 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 near the connecting unit 13 abuts against the end of the pant body unit 21. The end of the connecting unit 13 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 apart from the end of the rock drilling unit 22 close to the trouser body unit 21; wherein, the first value is greater than the second value, so that when the impact force 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 on the bearing unit 12 can be reduced, thereby solving the problem that the abutment of the drill bit and the drill rod of the existing stepped drill bit is prone to breakage or failure during the rock drilling process.

[0037] In this embodiment, the drill bit further includes a third working state; the third working state includes: the impact force received by 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 near 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 rock drilling unit 22 near the trouser body unit 21 moves towards the end of the connecting unit 13 away from the bearing unit 12.

[0038] In this embodiment, given the inherent errors in the machining precision of the supporting unit 12, those skilled in the art will know that different parts of the contact surface between the supporting unit 12 and the trouser body unit 21 may not be completely flush. This will result in excessive impact force on the rock drilling unit 22 during contact, causing localized stress protrusion in the supporting unit 12, which in turn can lead to damage or failure of the contact surface between the supporting unit 12 and the trouser body unit 21. By configuring the drill bit to operate in a manner where, when the impact force on the rock drilling unit 22 exceeds a first value, the end of the supporting unit 12 near the connecting unit 13 contacts 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 supporting unit 12 contacts the end of the rock drilling unit 22 near the trouser body unit 21, the stress variation during contact between the supporting unit 12 and the trouser body unit 21 can be reduced, thereby protecting the supporting unit 12.

[0039] In some embodiments, such as Figure 1As shown, when the drill bit 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 trouser body unit 21 is K, where 0.2mm≤K≤0.5mm.

[0040] In this embodiment, as Figure 1 As shown, when the drill bit 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 near the body unit 21 is K, where 0.2mm ≤ K ≤ 0.5mm. By setting the value of K between 0.2mm and 0.5mm, it is possible to avoid an excessively large value of K, which would cause the bearing unit 12 to be subjected to a large contact force when it reaches the first working state, especially when the end of the bearing unit 12 near the connecting unit 13 comes into contact with the end of the body unit 21 away from the rock drilling unit 22. Furthermore, those skilled in the art will know that when the value of K is too large, there is a possibility that the end of the bearing unit 12 near the connecting unit 13 and the end of the body unit 21 away from the rock drilling unit 22 may crack or fail, and the end of the connecting unit 13 away from the bearing unit 12 may not be able to contact the end of the rock drilling unit 22 near the body unit 21. By keeping the value of K between 0.2mm and 0.5mm, it is possible to avoid the situation where the end of the bearing unit 12 near the connecting unit 13 and the end of the trouser body unit 21 away from the rock drilling unit 22 break 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 near the trouser body unit 21. Preferably, the value of K can be 0.3mm.

[0041] In some embodiments, such as Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the supporting unit 12 includes a first supporting part 121 and a plurality of first slag discharge channels 122; the first slag discharge channels 122 are recessed inward from a portion of the outer peripheral surface of the first supporting part 121 along the radial direction of the first supporting part 121; the first slag discharge channels 122 penetrate both end faces of the first supporting part 121 along the axial direction of the first supporting part 121; the chisel 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 supporting part 121; the outer diameter of the first supporting 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 supporting part 121 along the axial direction of the rod module 111; the connecting unit 13 includes a connecting part 131, a second supporting 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 supporting part 132, and the other end is fixedly connected to one end of the first transition part 133, the first transition part 134... The other end of part 133 is fixedly connected to one end of the first supporting part 121; the connecting part 131 is connected to the trouser body unit 21; the second channel 134 passes through the connecting part 131, the first transition part 133, and the second supporting 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 trouser body unit 21 and the rock drilling unit 22; when the drill bit is in the first working state: the end of the first supporting part 121 away from the rod module 111 abuts against the trouser body unit 21, and the end of the second supporting part 132 away from the connecting part 131 abuts against the end of the rock drilling unit 22 near the trouser body unit 21; when the drill bit is in the second working state: the end of the first supporting part 121 away from the rod module 111 abuts against the trouser body unit 21, and the end of the second supporting part 132 away from the connecting part 131 is spaced apart from the end of the rock drilling unit 22 near the trouser body unit 21.

[0042] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the supporting unit 12 includes a first supporting part 121 and a plurality of first slag discharge grooves 122. The first slag discharge grooves 122 are recessed radially inward from a portion of the outer peripheral surface of the first supporting part 121. The first slag discharge grooves 122 penetrate both end faces of the first supporting part 121 along its axial direction. By providing a plurality of first slag discharge grooves 122 on the first supporting part 121, and preferably, the first slag discharge grooves 122 are evenly distributed on the first supporting part 121 along its circumference. By providing the first slag discharge grooves 122, a regular discharge channel can be formed during the drilling process, allowing at least a portion of the excrement in the borehole to 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 drilling tool during drilling. In some cases, multiple first slag discharge grooves 122 are provided on the first bearing part 121. The compressive strength of the first bearing part 121 in the axial direction will be reduced. When the impact force on the rock drilling unit 22 is greater than a first value, the end of the first bearing part 121 near 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 part 12 abuts against the end of the rock drilling unit 22 near the trouser body unit 21. This can reduce the pressure on the first bearing part 121 in its axial direction, thereby avoiding the situation where its compressive strength is reduced due to the provision of multiple first slag discharge grooves 122 on the first bearing part 121, resulting in cracking or failure.

[0043] 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 support part 121; the outer diameter of the first support part 121 is larger than the outer diameter of the rod body module 111; the first channel 112 passes through the rod body module 111 and the first support part 121 along the axial direction of the rod body module 111; the connecting unit 13 includes a connecting part 131, a second support 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 support 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 support part 121; the connecting part 131 is connected to the trouser body unit 21; the second channel 114 passes through the rod body module 111 and the first support part 121 along the axial direction of the rod body module 111. The connecting part 131 extends axially through the connecting part 131, the first transition part 133, and the second bearing part 132. One end of the second channel 134 is connected to the first channel 112, and the other end is connected to the trouser body unit 21 and the rock drilling unit 22. When the drill bit is in the first working state: the end of the first bearing part 121 away from the rod module 111 abuts against the trouser body unit 21, and the end of the second bearing part 132 away from the connecting part 131 abuts against the end of the rock drilling unit 22 near the trouser body unit 21. When the drill bit is in the second working state: the end of the first bearing part 121 away from the rod module 111 abuts against the trouser body unit 21, and the end of the second bearing part 132 away from the connecting part 131 is spaced apart from the end of the rock drilling unit 22 near the trouser body 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 body unit 21 and the rock drilling unit 22. The rock drilling unit 22 is connected to the outside. When drilling is performed, the fluid inside the drill bit can be ejected from the rock drilling unit 22 through the first channel 112 and the second channel 134, thereby discharging at least part of the excrement from the first slag discharge trough 122.

[0044] In some embodiments, the first slag discharge trough 122 is evenly spaced along the circumferential interval of the first support portion 121; the sum of the projected areas of the first slag discharge trough 122 perpendicular to the axis of the first support portion 121 is S1, and the contact area between the first support portion 121 and the trouser body 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 trough 122 perpendicular to the axis of the first support part 121 to the cross-sectional area of ​​the first support part 121 to between 1 / 4 and 1 / 3, the ratio of the cross-sectional area of ​​the first slag discharge trough 122 to the contact area between the first support part 121 and the trouser body unit 21 is at a more reasonable value. This ensures that the first slag discharge trough 122 has a good slag discharge effect, while also preventing the first support part 121 from breaking or failing under a large impact force along its axial direction due to the setting of the first slag discharge trough 122, which would otherwise cause a significant decrease in the compressive strength of the first support part 121.

[0046] In some embodiments, such as Figure 1 , Figure 4 , Figure 5 As shown, the trouser body unit 21 includes a trouser body module 211, a connecting groove 212, and a supporting ring 213; one end of the trouser body module 211 is fixedly connected to the rock drilling unit 22; the supporting ring 213 is fixedly connected to the other end of the trouser body module 211 along the circumference of the trouser body module 211; the connecting groove 212 is recessed inward along the axial direction of the trouser body module 211 from one end near the supporting ring 213; one end of the connecting groove 212 communicates with one end of the second channel 134, and the other end communicates with the rock drilling unit 22; the trouser body module 211 is connected to the rock drilling unit 22 through the connecting groove 212. The connecting part 131 is connected; when the drill bit 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 module 111, and the second bearing part 132 abuts against the end of the rock drilling unit 22 near the trouser module 211; when the drill bit 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 module 111, and the second bearing part 132 is spaced apart from the end of the rock drilling unit 22 near the trouser module 211.

[0047] In this embodiment, as Figure 1 , Figure 4 , Figure 5As shown, the trouser body unit 21 includes a trouser body module 211, a connecting groove 212, and a bearing ring 213; one end of the trouser body 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 body module 211 along the circumference of the trouser body module 211; the connecting groove 212 is recessed inward along the axial direction of the trouser body module 211 from one end of the trouser body module 211 near 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 body module 211 is connected to the connecting part 131; in this embodiment, the outer circumferential surface of the trouser body module 211 and the outer circumferential surface of the connecting groove 212 are respectively provided with wave-shaped threads, and the trouser body module 211 is threadedly connected to the connecting part 131 through the connecting groove 212.

[0048] When the drill bit is in its 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 module 111, and the second bearing part 132 abuts against the rock drilling unit 22; when the drill bit is in its 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 module 111, and the second bearing part 132 is spaced apart from the rock drilling unit 22. In this embodiment, by providing the bearing ring 213, the impact resistance of the trouser module 211 along the axial direction at the first bearing part 121 can be increased, and preferably, the bearing ring 213 can be integrally formed with the trouser module 211.

[0049] In some embodiments, such as Figure 4 , Figure 5 As shown, the bearing 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 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 penetrates both ends of the ring body 2131.

[0050] In this embodiment, as Figure 4 , Figure 5As shown, the bearing 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 portion 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 penetrates both ends of the ring body 2131. By setting the second slag discharge groove 2132, and preferably the second slag discharge groove 2132 is evenly distributed 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 and the second slag discharge groove 2132 are at least partially connected, so that at least part of the slag in the borehole 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 selectively connected to the first slag discharge groove 122.

[0051] In some embodiments, such as 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 troughs 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 inward from one end of the trouser body portion 2111 near 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 trough 2112 is recessed inward from a portion of the outer surface of the trouser body portion 2111 along the radial direction of the trouser body portion 2111; the third slag discharge trough 2112 is correspondingly connected to the second slag discharge trough 2132.

[0052] In this embodiment, as Figure 1 , Figure 6 , Figure 7As shown, the trouser body module 211 includes a trouser body portion 2111 and multiple third slag discharge troughs 2112; the third slag discharge troughs 2112 can serve as slag discharge channels. 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 inward from one end of the trouser body portion 2111 near the ring body 2131 along the axial direction of the trouser body portion 2111; in order to avoid the trouser body portion 2111 from being damaged by the third slag discharge troughs 2112, the trouser body portion 2111 is designed to prevent the third slag discharge troughs 2112 from being installed on the trouser body portion 2111. The compressive strength of the trouser body 2111 decreases in its axial direction. Those skilled in the art will understand that the thickness of the trouser body 2111 can be increased accordingly to avoid this decrease in axial compressive strength after the third slag discharge groove 2112 is installed on the trouser body 2111. The trouser body 2111 is connected to the connecting part 131 via a connecting groove 212. The third slag discharge groove 2112 is recessed inward from a portion of the outer surface of the trouser body 2111 along its radial direction. 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 the connection point can be smoothly transitioned to reduce the resistance experienced by the discharged slag in the first slag discharge groove 122 or the second slag discharge groove 2132.

[0053] In some embodiments, the outer diameter of the first support 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 it is discharged from the borehole can be reduced, making the discharge of slag smoother. 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, such as Figure 1 , Figure 7 As shown, the trouser body 2111 is threadedly connected to the connecting part 131; the third slag discharge trough 2112 is spirally arranged along the axial direction of the trouser body 2111.

[0056] In this embodiment, as Figure 1 , Figure 7As shown, by spirally arranging the third slag discharge trough 2112 along the axial direction of the pant body 2111, at least a portion of the high-pressure excrement is discharged from the first slag discharge trough via the third slag discharge trough 2112, the second slag discharge trough, and the tail section 2132. During rock drilling, in some cases, because the drill bit is a left-handed high-frequency impact drill, the pant body 2111 rotates synchronously at a high frequency. During the rotation, the excrement and the particles on the pant body 2111 form a relative displacement relationship. That is, in order to ensure smooth discharge of excrement, the second slag discharge trough 2132 and the third slag discharge trough 2112 can be designed as a left-handed structure. When the drill bit assembly 02 rotates to the left at a high frequency, the third slag discharge groove is spirally arranged at a certain angle on the pant body 2111. This causes the high-pressure fluid containing excrement in the third slag discharge groove to exert a force on the pant body 2111 in the circumferential direction. In order to avoid the threaded connection between the pant body 2111 and the connecting part 131 weakening due to this force, in this embodiment, the rotation direction of the third slag discharge groove is preferably the same as the rotation direction of the drill bit in the working state. Furthermore, the threaded connection between the pant body 2111 and the connecting part 131 is designed to rotate with the drill bit during rock drilling and to further enhance the threaded connection under the action of the excrement in the third slag discharge groove 2112. This reduces the resistance experienced by the pant body 2111 during rotation and prevents the threaded connection with the connecting part 131 from weakening during rotation. In this embodiment, since the third slag discharge trough 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 bit is working, thereby increasing the cleaning range of the borehole wall and better flushing out the excrement attached to the borehole wall.

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

[0058] In this embodiment, as Figure 4, Figure 5 , Figure 6 , Figure 7 As shown, the rock drilling unit 22 includes a rock drilling section 221, a second transition section 222, a third channel 223, a fourth channel 224, and a fourth slag discharge trough 225. One end of the second transition section 222 is fixedly connected to one end of the rock drilling section 221, and the other end is fixedly connected to the end of the trouser body section 2111 near the rock drilling section 221. The third channel 223 penetrates the second transition section 222 and the rock drilling section 221 along the axial direction of the second transition section 222. The end of the third channel 223 away from the rock drilling section 221 is connected to the second channel 134. In this embodiment, the number of 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 section 221. The fourth slag discharge trough 225 is recessed radially inward from part of the outer surface of the rock drilling section 221, and the fourth slag discharge trough 225 is connected to the third slag discharge trough 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 configured to be connected to the end of the rock drilling section 221 away from the second transition section 222. By setting the third channel 223 and the fourth channel 224, the high-speed fluid jet range inside the drill bit can be increased, and the excrement can be discharged from the borehole more comprehensively. Furthermore, by setting the fourth slag discharge trough 225, which is connected to the third slag discharge trough 2112, at least some 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, or a mixture of gravel, water, and dust; the fluid includes water, air, or a mixture of water and air.

[0060] The working principle of this invention is as follows:

[0061] When the drilling tool is drilling, if the impact force on the rock drilling unit 22 is greater than the first value, the end of the bearing unit 12 near 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 near the trouser body unit 21; if the impact force on the rock drilling unit 22 is less than the second value, the end of the bearing unit 12 near 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 is spaced apart from the end of the rock drilling unit 22 near the trouser body unit 21.

[0062] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. A drilling tool, characterized in that, The drilling tool includes: A drill rod assembly, comprising a drill rod unit, a support unit, and a connecting unit; one end of the support 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, comprising a pant body unit and a rock drilling unit; one end of the pant body unit is fixedly connected to one end of the rock drilling unit, and the pant body 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, the end of the bearing unit near the connecting unit abuts against the end of the trouser body unit away from the rock drilling unit, and the end of the connecting unit away from the bearing unit abuts against the end of the rock drilling unit near the trouser body unit; the second working state includes: the impact force received by the rock drilling unit is less than a second value, the end of the bearing unit near the connecting unit abuts against the end of the trouser body unit away from the rock drilling unit, and the end of the connecting unit away from the bearing unit and the end of the rock drilling unit near the trouser body unit are spaced apart; wherein, the first value is greater than the second value; The supporting unit includes a first supporting part and a plurality of first slag discharge channels; the first slag discharge channels are recessed radially inward from a portion of the outer peripheral surface of the first supporting part; the first slag discharge channels penetrate both end faces of the first supporting part along its axial direction; 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 supporting part; the outer diameter of the first supporting part is larger than the outer diameter of the rod body module; the first channel penetrates the rod body module and the first supporting part along its axial direction; the connecting unit includes a connecting part, a second supporting part, a first transition part, and a second channel; one end of the connecting part is fixedly connected to one end of the second supporting 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 first bearing part is fixedly connected to one end of the first bearing part; the connecting part is connected to the trouser body 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, with one end of the second channel communicating with the first channel and the other end communicating with the trouser body unit and the rock drilling unit; when the drill bit is in the first working state: the end of the first bearing part away from the rod module abuts against the trouser body unit, and the end of the second bearing part away from the connecting part abuts against the end of the rock drilling unit close to the trouser body unit; when the drill bit is in the second working state: the end of the first bearing part away from the rod module abuts against the trouser body unit, and the end of the second bearing part away from the connecting part is spaced apart from the end of the rock drilling unit close to the trouser body unit; The trouser body unit includes a trouser body module, a connecting groove, and a bearing ring; one end of the trouser body module is fixedly connected to the rock drilling unit; the bearing ring is fixedly connected to the other end of the trouser body module along the circumference of the trouser body module; the connecting groove is recessed inward along the axial direction of the trouser body module from one end of the trouser body module near 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 trouser body module is connected to the connecting part through the connecting groove.

2. A drilling tool according to claim 1, characterized in that, When the drill bit 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 trouser body unit is K, where 0.2mm≤K≤0.5mm.

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

4. A drilling tool according to claim 3, characterized in that, When the drill bit is in the first working state: the end of the bearing ring away from the rock drilling unit abuts against the end of the first bearing part away from the rod module, and the second bearing part abuts against the end of the rock drilling unit near the trouser module; when the drill bit is in the second working state: the end of the bearing ring away from the rock drilling unit abuts against the end of the first bearing part away from the rod module, and the second bearing part is spaced apart from the end of the rock drilling unit near the trouser module.

5. A drilling tool according to claim 4, characterized in that, The bearing 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 from a portion of the outer circumferential surface of the ring body inward along the radial direction of the ring body; the second slag discharge groove penetrates both end faces of the ring body.

6. A drilling tool according to claim 5, characterized in that, The trouser body module includes a trouser body section and multiple third slag discharge troughs; one end of the trouser body section is fixedly connected to the rock drilling unit, and the ring body is fixedly connected to the other end of the trouser body section along the circumference of the trouser body section; the connecting groove is recessed inward from one end of the trouser body section near the ring body along the axial direction of the trouser body section; the trouser body section is connected to the connecting part; the third slag discharge trough is recessed inward from a portion of the outer surface of the trouser body section along the radial direction of the trouser body section; the third slag discharge trough is correspondingly connected to the second slag discharge trough.

7. A drilling tool according to claim 5, characterized in that, The outer diameter of the first bearing part is H1, and the outer diameter of the ring body is H2, wherein 0.7≤H1 / H2≤1.

8. A drilling tool according to claim 6, characterized in that, The trouser body is threadedly connected to the connecting part; the third slag discharge trough is spirally arranged along the axial direction of the trouser body.

9. A drilling tool according to claim 6 or 8, characterized in that, The rock drilling unit includes a rock drilling section, a second transition section, a third channel, a fourth channel, and a fourth slag discharge trough; one end of the second transition section is fixedly connected to one end of the rock drilling section, and the other end is fixedly connected to the end of the trouser body section near the rock drilling section; the third channel passes through the second transition section and the rock drilling section along the axial direction of the second transition section; the end of the third channel away from the rock drilling section 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 section; the fourth slag discharge trough is recessed radially inward from a portion of the outer surface of the rock drilling section; the fourth slag discharge trough is connected to the third slag discharge trough.

Images