Fastened PDC drill bit mechanism and rock breaking drilling tool assembly

Abstract

The present application provides a fastened PDC drill bit mechanism and a rock-breaking drill tool assembly, wherein the fastened PDC drill bit mechanism includes a drill bit body, an inner cavity, two through-holes, a trigger member and a sliding member; the two ends of the drill bit body are respectively connected with teeth and a screw; a stop arm is slidably connected in each through-hole; the trigger member is connected with a linear drive component; and the upper end face of the sliding member adopts an inclined surface suitable for abutment by the trigger member. The rock-breaking drill tool assembly includes a PDC drill bit mechanism and a drill rod with a threaded groove. When in use, the screw is first screwed into the threaded groove of the drill rod, and then the trigger member abuts the inclined surface of the sliding member, causing the sliding member to slide downward, and both stop arms are driven to an outward state so that they can abut against the inner wall of the threaded groove. The fastened PDC drill bit mechanism and rock-breaking drill tool assembly provided by the present application can, on the basis of the threaded connection, strengthen the connection strength between the drill bit body and the drill rod by abutting the stop arm with the inner wall of the threaded groove.

Description

Technical Field

[0001] The present application belongs to the technical field of oil and gas drilling, and specifically relates to a fastened PDC drill bit mechanism and a rock breaking drill tool assembly. Background Art

[0002] A PDC (Polycrystalline Diamond Compact) drill bit, also known as a polycrystalline diamond composite drill bit, is a rock-breaking tool widely used in oil and gas drilling. Specifically, when underground rock needs to be broken, the PDC drill bit is inserted into the well, allowing the drill teeth to contact the rock-breaking surface. Subsequently, the drill bit rotates under the drive of the drill pipe, thereby achieving drilling perpendicular to the rock-breaking surface.

[0003] The existing drill bit and drill rod are mainly connected through a threaded structure. Specifically, a screw is installed at the end of the drill bit, and a thread groove for the screw thread connection is opened at the connecting end of the drill bit. The drill bit and drill rod are connected by screwing the screw into the thread groove.

[0004] The inventors discovered that when the above-mentioned threaded structure is used to connect the drill bit, the drill bit and the drill rod are easily loosened due to the limitations of the threaded structure itself; and because the drill bit performs high-vibration operations, the external threads of the drill bit and the internal threads of the drill rod thread groove are easily damaged, resulting in the technical defect of a loose connection of the PDC drill bit. Summary of the Invention

[0005] The embodiments of the present application provide a tightened PDC drill bit mechanism and a rock-breaking drill tool assembly, which aim to ensure a tight connection between the drill bit and the drill pipe, and avoid technical problems such as loose connection of the PDC drill bit due to limitations of the thread structure itself and high vibration damage.

[0006] To achieve the above objectives, the technical solution adopted in this application is:

[0007] A fastened PDC drill bit mechanism is provided, comprising a drill bit body having a tooth portion and a screw at each end; the axial direction of the drill bit body is defined as an up-down direction; wherein the tooth portion is located at the upper end of the drill bit body; the screw is located at the lower end of the drill bit body and is coaxially connected to the lower end surface of the drill bit body; the fastened PDC drill bit mechanism further comprises:

[0008] an inner cavity, which is formed in the drill body and has a lower end extending into the screw;

[0009] Two through holes are formed on the screw along the radial direction of the screw and are in communication with the inner cavity. A stop arm is slidably connected to the interior of each through hole. The stop arm has an inward state in which one end is in the through hole and the other end is in the inner cavity, and an outward state in which one end extends out of the through hole and the other end is in the inner cavity.

[0010] a triggering member, which is arranged in the inner cavity and slides along the radial direction of the drill body and is connected to a linear driving member for driving the triggering member to move; and

[0011] The sliding member is connected to the inner cavity for sliding in an up-down direction, and has a first movable position in contact with the upper end surface of the inner cavity, and a second movable position in contact with the lower end surface of the inner cavity; and when the sliding member is in the first movable position, the upper end of the sliding member and the trigger member are located on an axis parallel to the radial direction of the drill body; the upper end surface of the sliding member is an inclined surface inclined from top to bottom toward the trigger member;

[0012] wherein the linear driving member can drive the trigger member to move toward the inclined surface, so that the sliding member moves from the first moving position to the second moving position; in the process of the sliding member moving from the first moving position to the second moving position, the lower end of the sliding member is suitable for passing between the two stop arms in the retracted state, and moving the two stop arms from the retracted state to the extended state; when the stop arm is in the extended state, the stop arm is used to abut the inner wall of the thread groove on the drill rod to limit the movement of the screw relative to the thread groove.

[0013] In a possible implementation, the linear drive component includes:

[0014] a fixing nut, fixedly connected to the outer wall of the drill body, with its axial direction parallel to the sliding direction of the trigger member; and

[0015] a translation rod, threadedly connected to the fixing nut, one end of which is adapted to pass through the drill body and be inserted into the inner cavity; and the insertion end of the translation rod is rotationally connected to the trigger member;

[0016] Wherein, rotating the translation rod relative to the fixing nut can cause the translation rod to move along its own axial direction and drive the trigger member to move synchronously.

[0017] In a possible implementation, a receiving groove is formed at one end of the translation rod facing away from the inner cavity; a locking structure is provided between the translation rod and the fixing nut, and the locking structure includes:

[0018] A locking cover adapted to be buckled onto the outer periphery of the fixing nut, with an inner peripheral wall adapted to the outer peripheral wall of the fixing nut;

[0019] a prism, slidably inserted into the receiving groove along the axial direction of the receiving groove, and coaxially fixedly connected to the inner bottom wall of the locking cover; and

[0020] a first spring, disposed in the receiving groove, with two ends thereof connected to the insertion end of the prism and the bottom of the receiving groove, respectively, for pulling the prism toward the bottom of the receiving groove and causing the locking cover to buckle onto the outer periphery of the fixing nut;

[0021] Among them, the insertion end of the prism is integrally connected with a limit plate extending outward, and the opening of the accommodating groove is integrally connected with an anti-slip ring extending inward and used to abut the limit plate; and the anti-slip ring adopts a ring hole structure adapted to the prism to limit the rotation of the prism relative to the anti-slip ring.

[0022] In a possible implementation, the sliding member is connected to a first protrusion extending outward in a horizontal direction, and an inner wall of the inner cavity is provided with a strip groove extending in a vertical direction and suitable for the first protrusion to be embedded in;

[0023] Furthermore, a second spring is provided in the strip-shaped groove, wherein the axial direction of the second spring is parallel to the up-down direction, and the two ends of the second spring are respectively connected to the first protrusion and the upper end wall of the strip-shaped groove;

[0024] When the sliding member is in the first moving position, the second spring is in a normal state;

[0025] When the sliding member is in the second movement position, the second spring is in an elastically stretched state.

[0026] In a possible implementation, the end of the stop arm suitable for inserting into the inner cavity is defined as its inner end; when both of the stop arms are in the retracted state, the inner ends of the two stop arms are connected;

[0027] Furthermore, the inner end of one of the stop arms is connected to a metal piece, and the inner end of the other stop arm is connected to a magnetic piece suitable for generating a magnetic attraction effect with the metal piece.

[0028] In a possible implementation, the lower end of the sliding member adopts a conical structure, and the upper edge of the inner end surface of the stop arm adopts a chamfered structure suitable for inserting the conical structure.

[0029] In a possible implementation, the inner bottom surface of the inner cavity is provided with an angular groove adapted to fit with the lower end of the sliding member, and the lower end surface of the trigger member has an inclined surface structure adapted to fit with the inclined surface of the sliding member;

[0030] When the sliding member is in the second movement position, the inclined surface structure of the trigger member fits into the inclined surface of the sliding member, and the lower end of the sliding member is embedded in the angled groove.

[0031] In a possible implementation, each stop arm is connected to a second protrusion extending outward perpendicular to its own sliding direction, and the inner wall of the corresponding through hole has a guide groove suitable for the second protrusion to be embedded.

[0032] In the embodiment of the present application, the two stop arms are first adjusted to an inward-retracted state, and then the screw is tightened in conjunction with the threaded groove on the drill rod to achieve a preliminary connection between the drill body and the drill rod; subsequently, the trigger member is driven to move by a linear drive component, and is abutted against the inclined surface of the sliding member, thereby driving the sliding member to move downward; in the process of the sliding member moving downward, the lower end of the sliding member separates the two stop arms, causing the two stop arms to move back to the outward-retracted state, thereby abutting against the inner wall of the threaded groove on the screw.

[0033] When the drill bit body tends to move up and down relative to the drill rod, the abutment between the stop arm and the inner wall of the threaded groove can effectively offset part of the force, thereby achieving the technical purpose of strengthening the connection strength between the drill bit and the drill rod.

[0034] Compared with the prior art, the fastened PDC drill bit mechanism provided in this embodiment can enhance the connection strength between the drill bit body and the drill rod by abutting the stop arm against the inner wall of the thread groove on the basis of the threaded connection.

[0035] The technical solution adopted in this application also provides a rock breaking drill assembly, including:

[0036] The tightened PDC drill bit mechanism as set forth in any one of the preceding items; and

[0037] The drill rod has a thread groove at one end thereof suitable for being threadably connected to the screw rod.

[0038] In one possible implementation, an annular groove is provided on the inner peripheral wall of the thread groove, and the annular groove is suitable for inserting the stop arm in the outward state; and in the axial direction of the thread groove, the width of the annular groove is the same as the thickness of the stop arm.

[0039] The beneficial effects of the rock-breaking drill tool assembly provided in this embodiment are the same as those of the aforementioned fastened PDC drill bit mechanism, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is one of the three-dimensional structural schematic diagrams of the fastened PDC drill bit mechanism provided in an embodiment of the present application;

[0041] Figure 2 The second schematic diagram of the three-dimensional structure of the fastened PDC drill bit mechanism provided in an embodiment of the present application;

[0042] Figure 3 for Figure 2 Front view of

[0043] Figure 4 For the Figure 3 Cross-sectional structural diagram along line AA;

[0044] Figure 5 For the Figure 3 Cross-sectional structural diagram along line BB;

[0045] Figure 6 for Figure 5 A partial enlarged schematic diagram of the upper circle C;

[0046] Figure 7 A cross-sectional view of the combined structure of the translation rod and the trigger member used in the embodiment of the present application;

[0047] Figure 8 A schematic diagram of the combined structure of the locking cover and the prism used in the embodiment of the present application;

[0048] Figure 9 A schematic diagram of the three-dimensional structure of the translation rod used in the embodiment of the present application;

[0049] Figure 10 A partial schematic diagram of a drill bit body used in an embodiment of the present application;

[0050] Figure 11 A partial cross-sectional view of the drill bit body used in the embodiment of the present application;

[0051] Figure 12 A schematic diagram of a portion of the structure of the stop arm used in an embodiment of the present application;

[0052] Figure 13 for Figure 12 A partial enlarged schematic diagram of the upper circle D;

[0053] Figure 14 A partial cross-sectional view of the sliding member and screw assembly structure used in an embodiment of the present application;

[0054] Figure 15 A schematic diagram of the combined structure of the rock-breaking drill tool assembly provided in an embodiment of the present application;

[0055] Figure 16 A cross-sectional view of the structure of the drill rod used in the embodiment of the present application;

[0056] Explanation of the accompanying drawings: 1. Drill bit body; 11. Tooth; 12. Screw; 2. Inner cavity; 21. Strip groove; 22. Angular groove; 3. Perforation; 31. Guide groove; 4. Stop arm; 41. Metal part; 42. Magnetic part; 43. Second protrusion; 5. Trigger part; 6. Linear drive component; 61. Fixing nut; 62. Transverse rod; 621. Accommodating groove; 622. Anti-slip ring; 7. Sliding part; 71. First protrusion; 72. Second spring; 8. Locking structure; 81. Locking cover; 82. Prism; 821. Limiting plate; 83. First spring; 100. Drill rod; 110. Threaded groove; 120. Annular groove. DETAILED DESCRIPTION

[0057] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0058] Please also refer to Figures 1 to 14 The fastened PDC drill bit mechanism provided in this application is now described. The fastened PDC drill bit mechanism provided in this application includes a drill bit body 1, an inner cavity 2, two through-holes 3, a trigger member 5 and a sliding member 7.

[0059] The two ends of the drill body 1 respectively have a tooth portion 11 and a screw rod 12; the axial direction of the drill body 1 is defined as the up and down direction, and the above-mentioned tooth portion 11 is located at the upper end of the drill body 1, and the screw rod 12 is located at the lower end of the drill body 1 and is coaxially connected to the lower end face of the drill body 1.

[0060] The inner cavity 2 is opened in the drill body 1, and the lower end of the inner cavity 2 extends into the screw 12; during actual preparation, a first cavity can be opened on the inner bottom surface of the drill body 1, and a second cavity with the same caliber as the first cavity can be opened in the screw 12, and then the screw 12 is welded to the drill body 1, so that the first cavity and the second cavity are connected and combined into the above-mentioned inner cavity 2.

[0061] Both through-holes 3 are radially disposed on the screw 12 and communicate with the inner cavity 2. A stop arm 4 is slidably connected to the interior of each through-hole 3, with the stop arm 4 sliding in the axial direction of the corresponding through-hole 3. In this embodiment, the two through-holes 3 are coaxially disposed, and the relative movement of the two stop arms 4 is either toward or away from each other.

[0062] As the stop arm 4 slides, it has an inward-retracted state and an outward-extended state. Specifically:

[0063] When the stop arm 4 is in the retracted state, one end thereof is located in the through hole 3 and the other end is located inside the inner cavity 2;

[0064] When the stop arm 4 is in the extended state, one end thereof extends out of the through hole 3 and the other end is in the extended state in the inner cavity 2; in this state, the extended end of the stop arm 4 is used to abut the inner wall of the thread groove 110 on the drill rod 100 to limit the movement of the screw 12 relative to the thread groove 110, thereby achieving the technical purpose of strengthening the connection strength between the screw 12 and the thread groove 110.

[0065] It should be noted that, when the structure is not designed on the thread groove 110, the extended length of the stop arm 4 is approximately half of the radius of the internal thread cross section of the thread groove 110; Figure 1 and Figure 16 As shown, in the embodiment of the present application, the extension length of the stop arm 4 is proportional to the depth of the groove body added to the thread groove 110.

[0066] The trigger member 5 is arranged in the inner cavity 2 and slides along the radial direction of the drill body 1. The trigger member 5 is connected to a linear driving member 6, and the sliding and stationary state of the trigger member 5 can be controlled by the linear driving member 6.

[0067] The sliding member 7 is connected to the inner cavity 2 in a sliding manner along the up-down direction, and has a first moving position connected to the upper end surface of the inner cavity 2, and a second moving position moved downward to connect to the lower end surface of the inner cavity 2.

[0068] When the slider 7 is in the first moving position, the upper end of the slider 7 and the trigger 5 are located on an axis parallel to the radial direction of the drill body 1; and the upper end surface of the slider 7 is an inclined surface inclined from top to bottom toward the trigger 5.

[0069] In actual use, the linear driving member 6 can drive the trigger member 5 to move toward the inclined surface of the sliding member 7, so that the trigger member 5 abuts against the inclined surface and drives the sliding member 7 to move from the first moving position to the second moving position.

[0070] During the movement of the sliding member 7 from the first moving position to the second moving position, the lower end of the sliding member 7 is adapted to pass between the two stop arms 4 in the retracted state and move the two stop arms 4 from the retracted state to the extended state.

[0071] In the embodiment of the present application, the two stop arms 4 are first adjusted to an inward state, and then the screw 12 is tightened in conjunction with the threaded groove 110 on the drill rod 100 to achieve a preliminary connection between the drill body 1 and the drill rod 100; subsequently, the trigger member 5 is driven to move by the linear drive member 6, and is abutted against the inclined surface of the sliding member 7, thereby driving the sliding member 7 to move downward; in the process of the sliding member 7 moving downward, the lower end of the sliding member 7 separates the two stop arms 4, causing the two stop arms 4 to move back to the outward state, thereby abutting against the inner wall of the threaded groove 110 on the screw 12.

[0072] When the drill body 1 tends to move in the up and down directions relative to the drill rod 100, the abutment between the stop arm 4 and the inner wall of the threaded groove 110 can effectively offset part of the force, thereby achieving the technical purpose of strengthening the connection strength between the drill bit and the drill rod 100.

[0073] Compared with the prior art, the fastened PDC drill bit mechanism provided in this embodiment can strengthen the connection strength between the drill bit body 1 and the drill rod 100 by abutting the stop arm 4 against the inner wall of the thread groove 110 on the basis of the threaded connection.

[0074] In some embodiments, the above-mentioned characteristic linear drive member 6 can be used as follows Figure 6 、 Figure 7 and Figure 10 The structure shown. Figure 6 、 Figure 7 and Figure 10 The linear driving component 6 includes a fixing nut 61 and a translation rod 62 .

[0075] The fixing nut 61 is fixedly connected to the outer wall of the drill body 1 , and its axial direction is parallel to the sliding direction of the trigger member 5 .

[0076] The translation rod 62 is threadedly connected to the fixing nut 61 , and one end of the translation rod 62 is adapted to pass through the drill body 1 and be inserted into the inner cavity 2 ; and the insertion end of the translation rod 62 is rotationally connected to the trigger member 5 .

[0077] The processing method of the linear drive component 6 adopted in the present application includes: opening a prefabricated cavity connected to the inner cavity 2 on the drill body 1, and the axial direction of this prefabricated cavity is parallel to the sliding direction of the trigger member 5; then, inserting the linear rod 62 into the inner cavity 2, and rotating its insertion end to connect with the trigger member 5 (at this time, the drill body 1 has not yet been connected to the screw 12, so the inner cavity 2 is in an open state); then, threading the fixing nut 61 onto the linear rod 62, and then tightening it until it abuts against the outer wall of the drill body 1; finally, welding the fixing nut 61 to the drill body 1, and filling the gap between the two with metal to ensure that the planar structure of the fixing nut 61 is evenly connected to the arc surface structure of the outer wall of the drill body 1.

[0078] In actual use, rotating the translation rod 62 relative to the fixing nut 61 can make the translation rod 62 move along its own axis and drive the trigger member 5 to move synchronously, thereby realizing the drive control and position locking of the trigger member 5 outside the drill body 1.

[0079] It should be noted that, in this embodiment, the cross-section of the inner cavity 2 is a quadrilateral, and the cross-section of the trigger member 5 is also a quadrilateral; due to this structural limitation, when the translation rod 62 is rotated, the trigger member 5 does not rotate synchronously; therefore, a rotational connection is selected between the translation rod 62 and the trigger member 5 to avoid the trigger member 5 restricting the rotation of the translation rod 62, thereby improving the structural rationality of the present device.

[0080] In some embodiments, the above-mentioned characteristic translation rod 62 and the fixing nut 61 can be connected by the following method: Figures 6 to 11 The structure shown. Figures 6 to 11 The end of the translation rod 62 facing away from the inner cavity 2 is provided with a receiving groove 621 extending along the axial direction of the translation rod 62. In addition, a locking structure is provided between the translation rod 62 and the fixing nut 61, which can effectively limit the movement of the translation rod 62 relative to the fixing nut 61 (that is, relative to the drill body 1).

[0081] In this embodiment, the locking structure 8 includes a locking cover 81 , a prism 82 and a first spring 83 .

[0082] The locking cover 81 is suitable for buckling on the outer periphery of the fixing nut 61, and the inner peripheral wall is adapted to the outer peripheral wall of the fixing nut 61; specifically, the locking cover 81 can be prepared by a casting process, and its casting mold can be prepared by the following method: a long strip trough body connected end to end is opened on the upper surface of the hexagonal mold, and the trough body extends along the circumference of the fixing nut 61 in a zigzag manner, and then the part surrounded by the middle of the trough body structure is sunk, so that it can be made into a shape as shown in the figure by casting. Figure 8 The locking cover 81 is shown.

[0083] The prism 82 is inserted into the receiving groove 621 by sliding along the axial direction of the receiving groove 621 , and is coaxially fixedly connected to the inner bottom wall of the locking cover 81 .

[0084] The first spring 83 is arranged in the accommodating groove 621, and its two ends are respectively connected to the insertion end of the prism 82 and the bottom of the accommodating groove 621, and is used to pull the prism 82 toward the bottom of the accommodating groove 621 and make the locking cover 81 buckle on the outer periphery of the fixing nut 61; that is, when the locking cover 81 is buckled on the outer periphery of the fixing nut 61, the first spring 83 is in a normal state or an elastically stretched state, thereby providing a reset force for the locking cover 81 to move toward the fixing nut 61, and this reset force can be overcome by manpower to ensure that the locking cover 81 can move to disengage from the fixing nut 61, and ensure that the translation rod 62 can be switched to a drivable state again.

[0085] The opening of the receiving groove 621 has an anti-detachment structure for preventing the prism 82 from detaching. Specifically:

[0086] The insertion end of the prism 82 is integrally connected with a limit plate 821 extending outward, and the opening of the accommodating groove 621 is integrally connected with an anti-slip ring 622 extending inward and used to abut the limit plate 821; when the prism 82 moves away from the bottom of the accommodating groove 621 and is about to leave the accommodating groove 621, the anti-slip ring 622 and the limit plate 821 abut to stop further movement of the prism 82.

[0087] The anti-slip ring 622 adopts a ring hole structure that is compatible with the prism 82 to limit the rotation of the prism 82 relative to the anti-slip ring 622, so that after the locking cover 81 and the fixing nut 61 are separated, the locking cover 81 can be held by hand to twist the translation rod 62, thereby driving it to screw in relative to the fixing nut 61.

[0088] In some embodiments, the above-mentioned characteristic sliding member 7 and the inner cavity 2 can be connected by the following method: Figure 14 The structure shown. Figure 14 The sliding member 7 is connected to a first protrusion 71 extending outward in a horizontal direction, and the inner wall of the inner cavity 2 is provided with a strip groove 21 extending in an up-down direction and suitable for the first protrusion 71 to be embedded.

[0089] The combined structure of the first protrusion 71 and the strip groove 21 can effectively limit the movement trajectory and movement range of the sliding member 7 relative to the drill body 1 .

[0090] A second spring 72 is further provided in the strip groove 21 . The axial direction of the second spring 72 is parallel to the up-down direction, and two ends of the second spring 72 are connected to the first protrusion 71 and the upper end wall of the strip groove 21 , respectively.

[0091] When the sliding member 7 is in the first moving position, the second spring 72 is in a normal state;

[0092] When the sliding member 7 is in the second moving position, the second spring 72 is in an elastically stretched state.

[0093] By adopting the above technical solution, when the trigger member 5 is not acted upon by human power (specifically, the trigger member 5 is driven to move by the linear drive component 6 under human power), the second spring 72 can effectively ensure that the sliding member 7 is in the first moving position. On the one hand, it can ensure that the sliding member 7 can effectively receive the abutment of the trigger member 5, and on the other hand, it can prevent the sliding member 7 from contacting and limiting the stop arm 4, thereby preventing the stop arm 4 from affecting the threaded connection between the screw 12 and the thread groove 110.

[0094] In some embodiments, the above-mentioned characteristic stop arm 4 can be used as follows Figure 13 The structure shown. Figure 13 , defining the end of the stop arm 4 suitable for inserting into the inner cavity 2 as its inner end.

[0095] When the two stop arms 4 are in the retracted state, the inner ends of the two stop arms 4 abut against each other; and, the inner end of one of the stop arms 4 is connected to a metal part 41, and the inner end of the other stop arm 4 is connected to a magnetic part 42 suitable for producing a magnetic attraction effect with the metal part 41, so that in the absence of external force (the external force here specifically refers to the force brought by the downward movement of the sliding part 7 to drive the two stop arms 4 to move backwards), the two stop arms 4 can connect and restrict each other's positions, so that the two stop arms 4 are in the retracted state, avoiding interference with the connection between the screw 12 and the thread groove 110.

[0096] In some embodiments, the above-mentioned characteristic sliding member 7 and the stop arm 4 can be used as follows Figure 5 The structure shown. Figure 5 The lower end of the sliding member 7 adopts a conical structure, and the upper edge of the inner end surface of the stop arm 4 adopts a chamfered structure suitable for inserting the conical structure. The two cooperate with each other to ensure that when the sliding member 7 slides downward, it can extend between the two stop arms 4 and drive the two stop arms 4 to move backwards.

[0097] Please also refer to Figure 5 and Figure 14 In the embodiment of the present application, since the two stop arms 4 are symmetrically arranged, the conical structure at the lower end of the sliding member 7 can be designed as a structure with a vertical cross-section of a triangle, and the two sides of the triangle face the two stop arms 4.

[0098] In some embodiments, the above-mentioned characteristic inner cavity 2 and trigger member 5 can be used as follows Figure 5 and Figure 11 The structure shown. Figure 5 and Figure 11 The inner bottom surface of the inner cavity 2 is provided with an angular groove 22 adapted to fit with the lower end of the sliding member 7, as shown in FIG. Figure 11 As shown, the cross section of the angled groove 22 is triangular.

[0099] The lower end surface of the trigger member 5 has an inclined surface structure suitable for fitting with the inclined surface of the sliding member 7 .

[0100] When the sliding member 7 is in the second moving position, the inclined surface structure of the trigger member 5 fits into the inclined surface of the sliding member 7, and the lower end of the sliding member 7 is embedded in the angular groove 22; by adopting the above technical solution, compared with the original line contact, the surface-to-surface contact can enhance the structural stability between the drill body 1 and the sliding member 7.

[0101] In some embodiments, the above-mentioned feature stop arm 4 and the through hole 3 can be connected by the following method: Figure 4 The structure shown. Figure 4Each stop arm 4 is connected to a second protrusion 43, and the second protrusion 43 extends outward perpendicular to the sliding direction of the stop arm 4. In addition, the inner wall of each through hole 3 has a guide groove 31 suitable for the corresponding second protrusion 43 to be inserted.

[0102] The cooperation between the second protrusion 43 and the guide groove 31 can effectively limit the position of the stop arm 4 relative to the through hole 3, thereby improving the structural stability of the device. At the same time, it can also prevent the stop arm 4 from being separated from the corresponding through hole 3, thereby improving the structural stability of the device.

[0103] Based on the same inventive concept, the present application also provides a rock breaking drill assembly, please refer to Figures 1 to 16 The rock breaking drilling tool assembly proposed in this application includes any of the above-mentioned fastened PDC drill bit mechanisms and a drill rod 100.

[0104] One end of the drill rod 100 is provided with a thread groove 110 suitable for threaded connection with the screw rod 12 .

[0105] The beneficial effects of the rock-breaking drill tool assembly provided in this embodiment are the same as those of the aforementioned fastened PDC drill bit mechanism, and will not be described in detail here.

[0106] In some embodiments, the above-mentioned characteristic drill rod 100 can be used as follows Figure 16 The structure shown. Figure 16 An annular groove 120 is provided on the inner peripheral wall of the thread groove 110 , and the annular groove 120 is suitable for inserting the stop arm 4 in the outward state.

[0107] By inserting the two extended stop arms 4 into the annular groove 120, the connection between the screw 12 and the threaded groove 110 is strengthened. Compared to using two connecting portions corresponding to the stop arms 4, the use of the annular groove 120 structure not only eliminates restrictions on the position of the stop arms 4, but also reduces processing difficulty and improves production efficiency.

[0108] In the axial direction of the thread groove 110, the width of the annular groove 120 is the same as the thickness of the stop arm 4, so that when the stop arm 4 is inserted into the annular groove 120, the stop arm 4 can be effectively clamped, thereby ensuring the stability of the beneficial effect of this structure in strengthening the connection strength between the screw 12 and the thread groove 110.

[0109] The above content is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A fixed PDC drill bit mechanism, comprising a drill bit body having teeth and a screw at each end; the axial direction of the drill bit body is defined as the up and down direction; wherein, The tooth portion is located at the upper end of the drill bit body; the screw is located at the lower end of the drill bit body and is coaxially connected to the lower end surface of the drill bit body; it is characterized in that the fastened PDC drill bit mechanism further includes: an inner cavity, which is formed in the drill body and has a lower end extending into the screw; Two through holes are formed on the screw along the radial direction of the screw and are in communication with the inner cavity. A stop arm is slidably connected to the interior of each through hole. The stop arm has an inward state in which one end is in the through hole and the other end is in the inner cavity, and an outward state in which one end extends out of the through hole and the other end is in the inner cavity. a triggering member, which is arranged in the inner cavity and slides along the radial direction of the drill body and is connected to a linear driving member for driving the triggering member to move; and The sliding member is connected to the inner cavity for sliding in an up-down direction, and has a first movable position in contact with the upper end surface of the inner cavity, and a second movable position in contact with the lower end surface of the inner cavity; and when the sliding member is in the first movable position, the upper end of the sliding member and the trigger member are located on an axis parallel to the radial direction of the drill body; the upper end surface of the sliding member is an inclined surface inclined from top to bottom toward the trigger member; wherein the linear driving member can drive the trigger member to move toward the inclined surface, so that the sliding member moves from the first moving position to the second moving position; in the process of the sliding member moving from the first moving position to the second moving position, the lower end of the sliding member is suitable for passing between the two stop arms in the retracted state, and moving the two stop arms from the retracted state to the extended state; when the stop arm is in the extended state, the stop arm is used to abut the inner wall of the thread groove on the drill rod to limit the movement of the screw relative to the thread groove.

2. The fastened PDC drill bit mechanism according to claim 1, wherein: The linear drive component comprises: a fixing nut, fixedly connected to the outer wall of the drill body, with its axial direction parallel to the sliding direction of the trigger member; and a translation rod, threadedly connected to the fixing nut, one end of which is adapted to pass through the drill body and be inserted into the inner cavity; and the insertion end of the translation rod is rotationally connected to the trigger member; Wherein, rotating the translation rod relative to the fixing nut can cause the translation rod to move along its own axial direction and drive the trigger member to move synchronously.

3. The fastened PDC drill bit mechanism according to claim 2, wherein: A receiving groove is provided at one end of the translation rod facing away from the inner cavity; a locking structure is provided between the translation rod and the fixing nut, and the locking structure includes: A locking cover adapted to be buckled onto the outer periphery of the fixing nut, with an inner peripheral wall adapted to the outer peripheral wall of the fixing nut; a prism, slidably inserted into the receiving groove along the axial direction of the receiving groove, and coaxially fixedly connected to the inner bottom wall of the locking cover; and a first spring, disposed in the receiving groove, with two ends thereof connected to the insertion end of the prism and the bottom of the receiving groove, respectively, for pulling the prism toward the bottom of the receiving groove and causing the locking cover to buckle onto the outer periphery of the fixing nut; Among them, the insertion end of the prism is integrally connected with a limit plate extending outward, and the opening of the accommodating groove is integrally connected with an anti-slip ring extending inward and used to abut the limit plate; and the anti-slip ring adopts a ring hole structure adapted to the prism to limit the rotation of the prism relative to the anti-slip ring.

4. The fastened PDC drill bit mechanism according to claim 1, wherein: The sliding member is connected to a first protrusion extending outward in a horizontal direction, and the inner wall of the inner cavity is provided with a strip groove extending in an up-down direction and suitable for the first protrusion to be embedded in; Furthermore, a second spring is provided in the strip-shaped groove, wherein the axial direction of the second spring is parallel to the up-down direction, and the two ends of the second spring are respectively connected to the first protrusion and the upper end wall of the strip-shaped groove; When the sliding member is in the first moving position, the second spring is in a normal state; When the sliding member is in the second movement position, the second spring is in an elastically stretched state.

5. The fastened PDC drill bit mechanism according to claim 1, wherein: The end of the stop arm suitable for inserting into the inner cavity is defined as its inner end; when both the stop arms are in the retracted state, the inner ends of the two stop arms are connected; Furthermore, the inner end of one of the stop arms is connected to a metal piece, and the inner end of the other stop arm is connected to a magnetic piece suitable for generating a magnetic attraction effect with the metal piece.

6. The fastened PDC drill bit mechanism according to claim 5, wherein: The lower end of the sliding member adopts a tapered structure, and the upper edge of the inner end surface of the stop arm adopts a chamfered structure suitable for the tapered structure to be inserted.

7. The fastened PDC drill bit mechanism according to claim 6, wherein: The inner bottom surface of the inner cavity is provided with an angular groove adapted to fit with the lower end of the sliding member, and the lower end surface of the trigger member has an inclined surface structure adapted to fit with the inclined surface of the sliding member; When the sliding member is in the second movement position, the inclined surface structure of the trigger member fits into the inclined surface of the sliding member, and the lower end of the sliding member is embedded in the angled groove.

8. The fastened PDC drill bit mechanism according to claim 1, wherein: Each stop arm is connected with a second protrusion extending outwardly in a direction perpendicular to the stop arm's sliding direction, and the inner wall of the corresponding through hole is provided with a guide groove suitable for the second protrusion to be embedded in.

9. Rock breaking drilling tool assembly, characterized in that: include: The fastened PDC drill bit mechanism according to any one of claims 1 to 8; as well as The drill rod has a thread groove at one end thereof suitable for being threadably connected to the screw rod.

10. The rock breaking drill assembly according to claim 9, characterized in that: An annular groove is provided on the inner peripheral wall of the thread groove, and the annular groove is suitable for inserting the stop arm in the outward state; and in the axial direction of the thread groove, the width of the annular groove is the same as the thickness of the stop arm.

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