Combined drilling tools for tunnel drilling rigs

Abstract

This invention discloses a combined drilling tool for tunnel drilling rigs. The combined drilling tool includes a drill body with a connecting part, a flow channel, a plugging part, and a water inlet part. The plugging part is located within the flow channel, defining a first segment and a second segment of the flow channel. The plugging part has an open state and a closed state. In the open state, the plugging part connects the first and second segments; in the closed state, the plugging part disconnects the connection between the first and second segments. By incorporating a plugging part within the drill body, which has both open and closed states, the plugging part is in the open state during drilling. During connection, the plugging part is in the closed state, thus preventing water within the drill body from flowing back along the flow channel. This avoids the repeated drainage-filling process inside the drill rod for each connection, as is common in related technologies, improving drilling efficiency and meeting the green, efficient, and energy-saving production requirements of intelligent mine construction.

Description

Technical Field

[0001] This invention relates to the field of mining machinery technology, and in particular to a combined drilling tool for a tunnel drilling rig. Background Technology

[0002] Drilling is a crucial part of coal mining operations, frequently requiring the use of drilling rigs to construct various types of boreholes. This is especially important in high-gas or coal and gas outburst mines, and mines with complex hydrogeological conditions, where numerous gas drainage and water exploration boreholes are necessary. When using the wet drilling method, water is supplied to the drill bit through hollow drill rods to cool it and flush away cuttings. As the drilling depth increases, drill rods need to be added one by one. During this process, water supply must be stopped and the water supply device at the end of the drill rod must be removed. Particularly when drilling inclined boreholes, the water inside the drill rod after the water supply device is removed will flow back along the internal channels of the drill rod due to its own gravity. After each drill rod is added, the water supply device must be reconnected, and drilling can only continue after the drill rod is fully filled with water. In other words, each time a drill rod is added, the internal water supply process is repeated. As the drilling depth increases, the waiting time increases linearly. According to statistics, the waiting time for filling and draining accounts for about 1 / 3 to 1 / 2 of the drilling construction time. On the other hand, the water flowing out of the drill rod will also affect the mine working environment and have an adverse impact on the quality standardization of the drilling roadway. It is necessary to excavate sedimentation ponds and drainage ditches, and assign special personnel to carry out pumping and drainage operations. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a combined drilling tool for tunnel drilling rigs, which features improved drilling efficiency and meets the requirements of civilized and energy-saving production.

[0005] The combined drilling tool for tunnel drilling rigs according to embodiments of the present invention includes a drilling tool body, the drilling tool body having a connecting part, a flow channel, a sealing part, and a water inlet part. The connecting part is used to connect with a drill rod or a drill bit, the water inlet part is used to connect with a water pipe, the sealing part is located in the flow channel, the sealing part defines a first segment and a second segment of the flow channel, the sealing part has an open state and a closed state. In the open state, the sealing part is used to connect the first segment and the second segment to each other, and in the closed state, the sealing part is used to disconnect the connection between the first segment and the second segment.

[0006] The combined drilling tool for tunnel drilling rigs in this invention incorporates a sealing section within the drill bit body, which has both an open and a closed state. During drilling, the sealing section is in the open state. During connection, the sealing section is in the closed state, thereby preventing water within the drill bit body from flowing back along the flow channel. This avoids the repeated drainage-filling process inside the drill rod as required by related technologies, improving drilling efficiency and meeting the green, efficient, civilized, and energy-saving production requirements of intelligent mine construction.

[0007] In some embodiments, the drill body includes: a first drill rod, a first plugging assembly, a second drill rod, and a first water supply device. The first drill rod includes a first male end, a first rod body, and a first female end connected in sequence. The outer peripheral wall of the first male end is provided with external threads, and the inner peripheral wall of the first female end is provided with internal threads. The first plugging assembly includes a first conical spring, a first steel ball, and a first ball-stopping ring. The first end of the first conical spring is connected to the inner peripheral wall of the first rod body, and the outer peripheral wall of the first ball-stopping ring is connected to the inner peripheral wall of the first rod body. The first ball-stopping ring is located on the side of the first conical spring closer to the first female end. The first steel ball is located between the first conical spring and the first ball-stopping ring, and the second end of the first conical spring abuts against the first steel ball. The diameter of the first steel ball is larger than the diameter of the central through hole of the first ball-stopping ring and smaller than the inner diameter of the first rod body. The second drill pipe includes a second male head, a second rod body, and a second female head connected in sequence. The outer peripheral wall of the second male head is provided with an external thread that matches the internal thread of the first female head, and the inner peripheral wall of the second female head is provided with an internal thread. The top end of the second male head is provided with a first protrusion. The outer peripheral wall of the first water supply device is provided with an external thread that matches the internal threads of the first female head and the second female head. The top end of the first water supply device is provided with a second protrusion. In the open state, the external thread of the second male head is fully engaged with the internal thread of the first female head, and the first protrusion abuts against the first steel ball; or, the external thread of the first water supply device is fully engaged with the internal thread of the first female head, and the second protrusion abuts against the first steel ball, so that there is a gap between the first steel ball and the first ball-stopping ring. In the closed state, the first steel ball blocks the central through hole of the first ball-stopping ring.

[0008] In some embodiments, the cross-sectional area of ​​the first male connector and the cross-sectional area of ​​the first female connector gradually decrease along the direction from the first female connector to the first male connector, and the cross-sectional area of ​​the second male connector and the cross-sectional area of ​​the second female connector gradually decrease along the direction from the second female connector to the second male connector.

[0009] In some embodiments, the cross-sectional area of ​​the central through hole of the first ball retainer ring gradually decreases along the direction from the first female head toward the first male head.

[0010] In some embodiments, the first protrusion has a plurality of protrusions, which are spaced apart around the central axis of the second male head, and the second protrusion has a plurality of protrusions, which are spaced apart around the central axis of the first water supply device.

[0011] In other embodiments, the drill body includes: a second water supply device, multiple third drill rods, and multiple second sealing assemblies. Each third drill rod includes a third male head, a third rod body, and a third female head connected in sequence. The top of the third male head has a third protrusion, and the outer peripheral wall of the third male head has an external thread. The inner peripheral wall of the third female head has an internal thread that matches the external thread of the third male head. Each of the multiple second sealing assemblies corresponds to one of the multiple third drill rods. Each second sealing assembly includes a second conical spring, a second steel ball, and a second ball-stopping ring. The first end of the second conical spring is connected to the inner peripheral wall of the third rod body, and the outer peripheral wall of the second ball-stopping ring is connected to the inner peripheral wall of the third rod body. The second ball-stopping ring is located on the side of the second conical spring closest to the third female head, and the second steel ball is located on the side of the second conical spring closest to the third female head. Between the spring and the second retaining ring, the second end of the second conical spring abuts against the second steel ball. The diameter of the second steel ball is larger than the diameter of the central through hole of the second retaining ring and smaller than the inner diameter of the second rod. The outer peripheral wall of the second water supply device is provided with an external thread that matches the internal thread of the third female head. The top end of the first water supply device is provided with a fourth protrusion. In the open state, the external thread of any third male head is fully engaged with the internal thread of the other third female head, and the third protrusion abuts against the second steel ball. Alternatively, the external thread of the second water supply device is fully engaged with the internal thread of the third female head, and the fourth protrusion abuts against the second steel ball, so that there is a gap between the second steel ball and the second retaining ring. In the closed state, the second steel ball blocks the central through hole of the second retaining ring.

[0012] In other embodiments, the cross-sectional area of ​​the third male head and the cross-sectional area of ​​the third female head gradually decrease along the direction from the third female head to the third male head.

[0013] In other embodiments, the cross-sectional area of ​​the central through hole of the second ball retainer ring gradually decreases along the direction from the third female head to the third male head.

[0014] In other embodiments, the third protrusion has multiple portions, which are spaced apart around the central axis of the third male head.

[0015] In other embodiments, the fourth protrusion has multiple portions, which are spaced apart around the central axis of the second water supply device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the first drill rod and the first sealing assembly of the combined drilling tool for a tunnel drilling rig according to the first embodiment of the present invention.

[0017] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0018] Figure 3 This is a schematic diagram of the second drill rod of the combined drilling tool for a tunnel drilling rig according to the first embodiment of the present invention.

[0019] Figure 4 yes Figure 3 Enlarged schematic diagram of part B.

[0020] Figure 5 This is a schematic diagram of the first water supply unit of the combined drilling tool for a tunnel drilling rig according to the first embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the combined drilling tool for a tunnel drilling rig in the open state according to the first embodiment of the present invention.

[0022] Figure 7 This is a top view schematic diagram of the second male head of the combined drilling tool for a tunnel drilling rig according to the first embodiment of the present invention.

[0023] Figure 8 This is a schematic diagram of the third drill rod and the second plugging assembly of the combined drilling tool for a tunnel drilling rig according to the second embodiment of the present invention.

[0024] Figure 9 yes Figure 8 An enlarged schematic diagram of section C.

[0025] Figure 10 This is a schematic diagram of the second water supply unit for the combined drilling tool for a tunnel drilling rig according to the second embodiment of the present invention.

[0026] Figure label:

[0027] First male head 11, first rod body 12, first female head 13

[0028] First conical spring 21, first steel ball 22, first ball-stopping ring 23

[0029] Second male head 31, first protrusion 311, second rod body 32, second female head 33

[0030] First water supply unit 41, second protrusion 411

[0031] Third male head 51, third protrusion 511, third rod body 52, third female head 53

[0032] Second conical spring 61, second steel ball 62, second ball-retaining ring 63

[0033] Second water supply unit 71, fourth protrusion 711. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] The following describes the combined drilling tools for tunnel drilling rigs according to embodiments of the present invention with reference to the accompanying drawings.

[0036] like Figures 1 to 10 As shown, the combined drilling tool for tunnel drilling rigs in this embodiment of the invention includes a drilling tool body, which has a connecting part, a flow channel, a plugging part, and a water inlet part. The connecting part is used to connect with a drill rod or drill bit, the water inlet part is used to connect with a water pipe, and the plugging part is located inside the flow channel, defining a first segment and a second segment of the flow channel. The plugging part has an open state and a closed state. In the open state, the plugging part is used to connect the first segment and the second segment to each other, and in the closed state, the plugging part is used to disconnect the connection between the first segment and the second segment.

[0037] It is understood that during tunnel drilling, the drill bit of this embodiment is connected to the drill rod inside the borehole via the connecting part. Alternatively, the drill bit is connected to the drill bit via the connecting part during initial drilling, and then drilling operations are carried out. The water inlet is connected to a water pipe to supply water into the flow channel of the drill rod to cool the drill bit and flush out rock cuttings.

[0038] Optionally, the second section of the flow channel within the drill bit body is connected to the water inlet, and the first section of the flow channel within the drill bit body is connected to the flow channel of the drill bit or the flow channel of the drill pipe.

[0039] Therefore, during the drilling process using the combined drilling tool of the tunnel drilling rig according to this embodiment of the invention, after water enters the second section of the flow channel inside the drill tool body, if the sealing part is in the open state, the water flows through the sealing part to the first section of the flow channel inside the drill tool body. If it is necessary to add a drill tool body during the drilling process, the sealing part of the drill tool body located in the hole is closed before the addition work is carried out. After the addition is completed, the sealing part is changed from the closed state to the open state, and the drilling work continues.

[0040] The combined drilling tool for tunnel drilling rigs in this invention incorporates a sealing section within the drill bit body, which has both an open and a closed state. During drilling, the sealing section is in the open state. During connection, the sealing section is in the closed state, thereby preventing water within the drill bit body from flowing back along the flow channel. This avoids the repeated drainage-filling process inside the drill rod as required by related technologies, improving drilling efficiency and meeting the green, efficient, civilized, and energy-saving production requirements of intelligent mine construction.

[0041] In some embodiments, such as Figures 1 to 7 As shown, the drill string body includes: a first drill pipe, a first plugging assembly, a second drill pipe, and a first water supply device 41.

[0042] Optionally, such as Figure 1 and Figure 2 As shown, the first drill pipe includes a first male head 11, a first rod body 12, and a first female head 13 connected sequentially from top to bottom. The first male head 11, the first rod body 12, and the first female head 13 can be integrally formed or friction-welded together. The outer peripheral wall of the first male head 11 is provided with external threads, and the inner peripheral wall of the first female head 13 is provided with internal threads. The external thread of the first male head 11 serves as the connecting part of the drill bit body.

[0043] Optionally, such as Figure 1 and Figure 2 As shown, the first sealing assembly includes a first conical spring 21, a first steel ball 22, and a first ball-stopping ring 23. The first conical spring 21 is wider at the top and narrower at the bottom, and its upper end is connected to the inner peripheral wall of the first rod 12. The outer peripheral wall of the first ball-stopping ring 23 is connected to the inner peripheral wall of the first rod 12, and the first ball-stopping ring 23 is located below the first conical spring 21. The first steel ball 22 is located between the first conical spring 21 and the first ball-stopping ring 23, with the lower end of the first conical spring 21 abutting against the first steel ball 22. The diameter of the first steel ball 22 is larger than the diameter of the central through hole of the first ball-stopping ring 23 and smaller than the inner diameter of the first rod 12.

[0044] The first ball-stopping ring 23 is used to block the first steel ball 22 from moving downward. Under the action of the first conical spring 21, at least part of the first steel ball 22 is located in the central through hole of the first ball-stopping ring 23, thereby achieving the effect of blocking the central through hole of the first ball-stopping ring 23.

[0045] That is, the first plugging component is the plugging part of the aforementioned drill bit body. For example... Figure 2 As shown, in the blocked state, the first steel ball 22 blocks the upper opening of the central through hole of the first ball-stopping ring 23. Figure 6 As shown, in the open state, the first steel ball 22 releases the sealing effect on the upper opening of the central through hole of the first ball-stopping ring 23.

[0046] Specifically, such as Figure 1 and Figure 2 As shown, the cross-sectional area of ​​the first male head 11 and the cross-sectional area of ​​the first female head 13 gradually decrease from bottom to top. The external thread of the first male head 11 and the internal thread of the first female head 13 can be matched. For example, the male head of one first drill pipe can be assembled with the female head of another first drill pipe.

[0047] like Figure 1 and Figure 2 As shown, a spring groove is provided on the inner peripheral wall of the first rod 12. The upper end of the first conical spring 21 is engaged in the spring groove, and the lower end of the first conical spring 21 abuts against the first steel ball 22. The cross-sectional area of ​​the lower half of the central through hole of the first ball-stopping ring 23 gradually decreases from bottom to top, while the cross-sectional area of ​​the upper half of the central through hole of the first ball-stopping ring 23 gradually increases from bottom to top. That is, the cross-sectional shape of the first ball-stopping ring 23 is triangular.

[0048] Optionally, such as Figure 3 and Figure 4 As shown, the second drill pipe includes a second male head 31, a second rod body 32, and a second female head 33 connected in sequence. The second male head 31, the second rod body 32, and the second female head 33 can be integrally formed or friction-welded together. The outer peripheral wall of the second male head 31 is provided with an external thread that matches the internal thread of the first female head 13, and the inner peripheral wall of the second female head 33 is provided with an internal thread. The top of the second male head 31 is provided with a first protrusion 311.

[0049] The first drill pipe and the second drill pipe are connected by the internal thread of the first female head 13 and the external thread of the second male head 31. After connection, the flow channels in the first male head 11, the first rod body 12, the first female head 13, the second male head 31, the second rod body 32, and the second female head 33 together form the flow channels of the drill bit body.

[0050] It is understandable that, such as Figure 6 As shown, in the open state, the external thread of the second male head 31 is fully engaged with the internal thread of the first female head 13, and the upper end of the first protrusion 311 abuts against the first steel ball 22, so that the first steel ball 22 moves upward and compresses the first conical spring 21, so that there is a gap between the first steel ball 22 and the first ball-stopping ring 23, thereby allowing water to flow through.

[0051] Specifically, such as Figures 3 to 7As shown, the cross-sectional area of ​​the second male head 31 and the cross-sectional area of ​​the second female head 33 gradually decrease from bottom to top. The external thread of the second male head 31 is compatible with the internal thread of the second female head 33; for example, the male head of one second drill pipe can be assembled with the female head of another second drill pipe. Multiple first protrusions 311 are distributed at intervals around the central axis of the second male head 31.

[0052] Optionally, such as Figure 5 As shown, the outer peripheral wall of the first water supply device 41 is provided with an external thread that matches the internal thread of the first female head 13 and the internal thread of the second female head 33, and the top of the first water supply device 41 is provided with a second protrusion 411. That is, the first water supply device 41 is the water inlet of the drill body.

[0053] It is understandable that, in the open state, in addition to the above-mentioned case where the second male head 31 is assembled with the first female head 13, the external thread of the first water supply 41 can also be fully engaged with the internal thread of the first female head 13, and the second protrusion 411 abuts against the first steel ball 22 so that there is a gap between the first steel ball 22 and the first ball retaining ring 23.

[0054] Specifically, such as Figure 5 As shown, the first water supply device 41 also has a male connector. The external thread of the first water supply device 41 is provided on the outer peripheral wall of the male connector of the first water supply device 41, and the cross-sectional area of ​​the male connector of the first water supply device 41 gradually decreases from bottom to top. A second protrusion 411 is provided at the upper end of the male connector of the first water supply device 41. There are multiple second protrusions 411, and the multiple second protrusions 411 are distributed at intervals around the central axis of the first water supply device 41.

[0055] In summary, during the process of adding the combined drilling tool for the tunnel drilling rig according to some embodiments of the present invention, the first drill rod is first connected to the drill rod inside the borehole, and then the first water supply device 41 is connected to the first drill rod before drilling. After the first drill rod is also drilled into the hole, the first water supply device 41 is removed, the second drill rod is assembled onto the first drill rod, and then the first water supply device 41 is assembled onto the second drill rod before drilling.

[0056] Therefore, by adopting a direct contact method, the first sealing component inside the first drill pipe is actively opened, which improves the reliability of water supply and avoids the problem that the first sealing component cannot be opened by water pressure alone due to too low water supply pressure or too large borehole height.

[0057] In other embodiments, such as Figures 8 to 10 As shown, the drill string body includes: a second water supply unit 71, multiple third drill pipes, and multiple second plugging assemblies. Only one third drill pipe and one second plugging assembly are shown in the figure.

[0058] Optionally, such as Figure 8 and Figure 9 As shown, the third drill pipe includes a third male head 51, a third rod body 52, and a third female head 53 connected in sequence. The third male head 51, the third rod body 52, and the third female head 53 can be integrally formed or friction-welded together.

[0059] The third male head 51 has a third protrusion 511 at its top end, and an external thread on its outer peripheral wall. The third female head 53 has an internal thread on its inner peripheral wall that matches the external thread of the third male head 51. The external thread of the third male head 51 is the connecting part of the drill body.

[0060] Multiple second sealing assemblies correspond one-to-one with multiple third drill pipes, meaning that each third drill pipe contains one second sealing assembly. Each second sealing assembly includes a second conical spring 61, a second steel ball 62, and a second retaining ring 63. The second conical spring 61 is wider at the top and narrower at the bottom, with its upper end connected to the inner circumferential wall of the third rod body 52. ​​The outer circumferential wall of the second retaining ring 63 is connected to the inner circumferential wall of the third rod body 52, and the second retaining ring 63 is located below the second conical spring 61. The second steel ball 62 is located between the second conical spring 61 and the second retaining ring 63, with the lower end of the second conical spring 61 abutting against the second steel ball 62. The diameter of the second steel ball 62 is larger than the diameter of the central through hole of the second retaining ring 63 but smaller than the inner diameter of the second rod body 32.

[0061] The second ball retainer ring 63 is used to prevent the second steel ball 62 from moving downwards. Under the action of the second conical spring 61, at least a portion of the second steel ball 62 is located within the central through hole of the second ball retainer ring 63, thereby achieving the effect of sealing the central through hole of the second ball retainer ring 63. That is, the second sealing component is the sealing part of the drill bit body described above.

[0062] Optionally, such as Figure 10 As shown, the outer peripheral wall of the second water supply device 71 is provided with an external thread that matches the internal thread of the third female head 53, and the top of the first water supply device 41 is provided with a fourth protrusion 711. That is, the second water supply device 71 is the water inlet of the aforementioned drill bit body.

[0063] Specifically, such as Figures 8 to 10 As shown, the cross-sectional area of ​​the third male head 51 and the cross-sectional area of ​​the third female head 53 gradually decrease from bottom to top, and the cross-sectional area of ​​the central through hole of the second ball-stopping ring 63 gradually decreases from bottom to top.

[0064] Furthermore, there are multiple third protrusions 511, which are spaced apart around the central axis of the third male head 51. There are multiple fourth protrusions 711, which are spaced apart around the central axis of the second water supply device 71.

[0065] In summary, it can be understood that there are two scenarios when the second sealing component is in the open state.

[0066] The first scenario is as follows: The external thread of the third male head 51 of one third drill rod is engaged with the internal thread of the third female head 53 of another third drill rod. When the external thread of the third male head 51 and the internal thread of the third female head 53 are fully engaged, the third protrusion 511 abuts against the second steel ball 62, causing the second steel ball 62 to move upward and compress the second conical spring 61, creating a gap between the second steel ball 62 and the second ball retaining ring 63, thereby allowing water to flow through.

[0067] The second scenario is: the external thread of the second water supply device 71 is engaged with the internal thread of the third male head 51 of the third drill rod. When the external thread of the second water supply device 71 is fully engaged with the internal thread of the third female head 53, the fourth protrusion 711 abuts against the second steel ball 62, so that there is a gap between the second steel ball 62 and the second ball retaining ring 63.

[0068] Therefore, during the drilling process of the combined drilling tool for tunnel drilling rigs using other embodiments of the present invention, after a third drill rod is drilled into the borehole, the second water supply device 71 is removed. At this time, the second sealing assembly is in a closed state. Then, a new third drill rod is added to the existing third drill rod in the hole. After the addition is completed, the second sealing assembly of the existing third drill rod in the hole is in an open state, and the second sealing assembly of the newly added third drill rod is in a closed state. Then, the second water supply device 71 is assembled onto the newly added third drill rod so that the second sealing assembly of the newly added third drill rod is in an open state, and then drilling operations are carried out.

[0069] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0073] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0074] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A combination drilling tool for a tunnel drilling rig, characterized in that, include: The drill bit body has a connecting part, a flow channel, a plugging part, and a water inlet part. The connecting part is used to connect with the drill rod or drill bit. The water inlet part is used to connect with a water pipe. The plugging part is located in the flow channel and defines the flow channel into a first segment and a second segment. The plugging part has an open state and a closed state. In the open state, the plugging part is used to connect the first segment and the second segment to each other. In the closed state, the plugging part is used to disconnect the connection between the first segment and the second segment. The drill bit body includes: The first drill pipe includes a first male head, a first rod body, and a first female head connected in sequence. The outer peripheral wall of the first male head is provided with an external thread, and the inner peripheral wall of the first female head is provided with an internal thread. The first sealing assembly includes a first conical spring, a first steel ball, and a first ball-stopping ring. The first end of the first conical spring is connected to the inner peripheral wall of the first rod body, and the outer peripheral wall of the first ball-stopping ring is connected to the inner peripheral wall of the first rod body. The first ball-stopping ring is located on the side of the first conical spring closer to the first female head. The first steel ball is located between the first conical spring and the first ball-stopping ring. The second end of the first conical spring abuts against the first steel ball. The diameter of the first steel ball is larger than the diameter of the central through hole of the first ball-stopping ring and smaller than the inner diameter of the first rod body. The second drill pipe includes a second male head, a second rod body, and a second female head connected in sequence. The outer peripheral wall of the second male head is provided with an external thread that matches the internal thread of the first female head. The inner peripheral wall of the second female head is provided with an internal thread. The top end of the second male head is provided with a first protrusion. The first water supply device has an external thread on its outer peripheral wall that matches the internal thread of the first female head and the internal thread of the second female head, and a second protrusion is provided at the top of the first water supply device. In the open state, the external thread of the second male head is fully engaged with the internal thread of the first female head, and the first protrusion abuts against the first steel ball; or, the external thread of the first water supply device is fully engaged with the internal thread of the first female head, and the second protrusion abuts against the first steel ball, so that there is a gap between the first steel ball and the first ball retainer ring. In the closed state, the first steel ball blocks the central through hole of the first ball-blocking ring.

2. The combined drilling tool for tunnel drilling rigs according to claim 1, characterized in that, The cross-sectional area of ​​the first male connector and the cross-sectional area of ​​the first female connector gradually decrease along the direction from the first female connector to the first male connector, and the cross-sectional area of ​​the second male connector and the cross-sectional area of ​​the second female connector gradually decrease along the direction from the second female connector to the second male connector.

3. The combined drilling tool for tunnel drilling rigs according to claim 2, characterized in that, The cross-sectional area of ​​the central through hole of the first ball retainer ring gradually decreases along the direction from the first female head to the first male head.

4. The combined drilling tool for tunnel drilling rigs according to claim 3, characterized in that, The first protrusion has multiple portions, which are spaced apart around the central axis of the second male head. The second protrusion has multiple portions, which are spaced apart around the central axis of the first water supply device.

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