Strongly weathered rock drilling rig

Abstract

The present invention provides a strongly weathered rock formation screw-in drilling rig, which belongs to the technical field of screw-in drilling rigs, and includes a drilling rig body, a mast mechanism, a machine-locked drill rod, and a double-flap pick drill bit. The mast mechanism is arranged on the drilling rig body; the machine-locked drill rod is connected to the mast mechanism to rotate and press down under the drive of the mast mechanism; the double-flap pick drill bit is connected to the machine-locked drill rod, and a flow hole is arranged on the side wall. The present invention is conducive to improving drilling efficiency, reducing energy consumption of drilling operations, facilitating the control of the construction period and cost of drilling operations, and also conducive to environmental protection; it is very suitable for drilling operations in strongly weathered rock formations in the fields of pile foundation, oil and gas mineral mining, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of rotary drilling rigs, and more specifically, relates to a rotary drilling rig for strongly weathered rock formations. Background Art

[0002] The rotary drilling rig is also called a rotary drilling rig, which can be used for drilling operations in the fields of pile foundation, oil and gas mineral mining, etc. Because the rock structure is loose, the structural strength is low, and there is a lot of slag in the strongly weathered rock formation, when using a rotary drilling rig to drill holes in the strongly weathered rock formation, it is necessary to continuously raise and lower the drill bit to discharge the slag in the hole, and in order to avoid the risk of hole collapse, drilling needs to be very careful, which leads to very low drilling efficiency, which is not only not conducive to the control of the construction period, but also makes the energy consumption of the operation very high, which is not conducive to cost control and environmental protection. Summary of the invention

[0003] The purpose of the present invention is to provide a rotary drilling rig for strongly weathered rock formations to solve the technical problems in the prior art of using a rotary drilling rig to perform hole-forming operations on strongly weathered rock formations, which is low in efficiency and high in energy consumption, is not conducive to construction period and cost control, and is not conducive to environmental protection.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a strongly weathered rock stratum rotary drilling rig, including a drilling rig body, a mast mechanism, a machine-locked drill rod and a double-petal pick drill bit, the mast mechanism being arranged on the drilling rig body; the machine-locked drill rod being connected to the mast mechanism so as to rotate and press downward under the drive of the mast mechanism; the double-petal pick drill bit being connected to the machine-locked drill rod, and a flow hole being arranged on the side wall.

[0005] In combination with the above technical scheme, in a possible implementation method, a double-petal pick drill bit includes a connecting box, a first half-cylinder, a second half-cylinder, a first cutting plate and a second cutting plate, the connecting box is connected to the machine-locked drill rod; the first half-cylinder is rotatably connected to the connecting box; the second half-cylinder is rotatably connected to the connecting box, and can be assembled with the first half-cylinder into a cylindrical structure; the first cutting plate is connected to the lower part of the first half-cylinder and is inclined inward; the second cutting plate is connected to the lower part of the second half-cylinder and is inclined inward; wherein, the cutting sides of the first cutting plate and the second cutting plate are both provided with a plurality of cutting teeth, and the opposite sides of the cutting sides on the free ends of the first cutting plate and the second cutting plate abut against each other; the flow hole is provided on the side wall of the first half-cylinder and / or the second half-cylinder.

[0006] In combination with the above technical solution, in a possible implementation method, a limit assembly is provided at the abutment point of the first cutting plate and the second cutting plate; the limit assembly includes a disassembly seat and a limit protrusion, and the disassembly seat is detachably connected to the first cutting plate or the second cutting plate; the limit protrusion is fixedly set on the disassembly seat.

[0007] In combination with the above technical solution, in a possible implementation, the strongly weathered rock formation rotary drilling rig also includes a crushing assembly, which is arranged on the outside of the side wall of the double-petal drill bit and at the flow hole to crush the passing slag.

[0008] In combination with the above technical solution, in a possible implementation method, an inner baffle is provided on the inner side of the side wall of the double-petal pick drill bit, and the inner baffle is located behind the flow hole; an inner baffle plate is also provided on the inner baffle, and the side of the inner baffle plate facing away from the rotation direction of the double-petal pick drill bit is connected to the inner baffle, the inner baffle plate covers the flow hole, and there is a gap between the inner side and the inner wall of the double-petal pick drill bit.

[0009] In combination with the above technical solution, in a possible implementation, the crushing assembly includes an elastic plate, a dynamic grinding plate and a fixed grinding plate, the elastic plate covers the outside of the flow hole, and is connected to the outer wall of the double-petal drill bit on the side facing the rotation direction of the double-petal drill bit, and there is a gap between the inner side of the elastic plate and the outer wall of the double-petal drill bit; the dynamic grinding plate is fixedly arranged on the side of the elastic plate facing the flow hole; the fixed grinding plate is fixedly arranged on the side of the elastic plate facing the flow hole, and its position cooperates with the dynamic grinding plate to grind the passing slag.

[0010] In combination with the above technical solution, in a possible implementation method, the crushing assembly also includes a rotating seat, a rotating shaft, a push cam and a driving wheel. The rotating seat is arranged on the outer wall of the double-petal cutter drill bit; the rotating shaft is rotatably arranged on the rotating seat along a vertical or inclined direction; the push cam is arranged in the flow hole and is fixedly connected to the rotating shaft; the driving wheel is fixedly connected to the rotating shaft to rotate by friction with the hole wall, thereby driving the push cam to periodically push the elastic plate.

[0011] In combination with the above technical solution, in a possible implementation method, a mounting seat is provided on the outer wall of the double-petal cutter drill bit, a mounting groove is provided in the mounting seat, and the elastic plate is installed in the mounting groove by welding, bolting or clamping; the driving wheel is a spherical structure with teeth on the outside; the dynamic grinding plate and the fixed grinding plate are both U-shaped plates or L-shaped plates.

[0012] In combination with the above technical solution, in a possible implementation method, the strongly weathered rock formation rotary drilling rig also includes a mud circulation and filtering mechanism, a rotating sleeve is provided at the lower part of the machine-locked drill rod, the rotating sleeve is rotatably connected to the machine-locked drill rod, a slurry suction head is provided on the rotating sleeve, and the slurry suction head is connected to the mud circulation and filtering mechanism through a slurry duct.

[0013] In combination with the above technical solution, in a possible implementation, a hard connection ring is provided on the outside of the slurry conduit, a ball bracket is provided on the hard connection ring, and a ball assembly is provided on the ball bracket.

[0014] The beneficial effects of the strongly weathered rock formation rotary drilling rig provided by the present invention are as follows: compared with the prior art, the present invention can effectively improve the drilling efficiency through the cooperation of the machine-locked drill rod and the double-petal pick drill bit, and the provision of flow holes on the side wall of the double-petal pick drill bit; since there are multiple locking points on the machine-locked drill rod, the power head of the mast mechanism is interlocked with the locking points for mechanical locking, so that when encountering a rock formation with relatively high strength, the power head can effectively apply force to the drill bit to avoid slippage between the power head and the machine-locked drill rod, avoid drilling pressure loss, and help improve drilling efficiency; and the adopted double-petal pick drill bit is not only suitable for It is suitable for drilling in strong rock formations, and can also allow the slag in the drilling process to enter the double-petal pick drill bit. At the same time, a flow hole is opened on the side wall of the double-petal pick drill bit, so that during the drilling and lifting process, the smaller slag inside the double-petal pick drill bit can flow out from the flow hole with the mud, so that the double-petal pick drill bit can accommodate more large slag, thereby reducing the reciprocating number and resistance of the drill bit lifting and lowering, which is beneficial to improving the drilling efficiency, reducing the energy consumption of the drilling operation, and facilitating the construction period and cost control of the drilling operation, and is also beneficial to environmental protection; it is very suitable for hole-forming operations in strongly weathered rock formations in the fields of pile foundation, oil and gas mineral mining, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 A schematic diagram of the structure of a strongly weathered rock formation rotary drilling rig provided by an embodiment of the present invention;

[0017] Figure 2 A schematic structural diagram of a double-cutting cutter drill bit for a strongly weathered rock formation rotary drilling rig provided by an embodiment of the present invention;

[0018] Figure 3 A schematic diagram of the matching positions of the first cutting plate and the second cutting plate and the limit assembly on a double-flap pick drill bit of a strongly weathered rock formation rotary drilling rig provided by another embodiment of the present invention;

[0019] Figure 4 A schematic diagram of the external structure of a crushing component of a strongly weathered rock formation rotary drilling rig provided in yet another embodiment of the present invention;

[0020] Figure 5 A vertical cross-sectional structural schematic diagram of a crushing component portion of a strongly weathered rock formation rotary drilling rig provided in yet another embodiment of the present invention;

[0021] Figure 6 A schematic structural diagram of a strongly weathered rock formation rotary drilling rig provided in yet another embodiment of the present invention;

[0022] Figure 7 A schematic cross-sectional structural diagram of the slurry conduit portion of a rotary drilling rig for strongly weathered rock formations provided in yet another embodiment of the present invention.

[0023] Among them, the reference numerals in the figures are as follows:

[0024] 10. Drilling rig body; 20. Mast mechanism; 30. Machine-locked drill rod;

[0025] 40. Double-flap pick drill bit; 41. Connecting box; 42. First half cylinder; 43. Second half cylinder; 44. First cutting plate; 45. Second cutting plate; 46. Cutting teeth; 471. Disassembly seat; 472. Limiting protrusion; 48. Flow hole; 49. Inner baffle;

[0026] 51. elastic plate; 52. dynamic grinding plate; 53. fixed grinding plate; 54. rotating seat; 55. rotating shaft; 56. pushing cam; 57. driving wheel; 58. mounting seat;

[0027] 60. Mud circulation and filtering mechanism; 61. Rotating sleeve; 62. Slurry suction head; 63. Slurry conduit; 64. Hard connecting ring; 65. Ball bracket; 66. Ball assembly. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0029] It should be further explained that the drawings and implementation modes of the present invention mainly describe the concept of the present invention. On the basis of this concept, the specific forms and settings of some connection relationships, positional relationships, power mechanisms, power supply systems, hydraulic systems and control systems may not be fully described. However, on the premise that those skilled in the art understand the concept of the present invention, those skilled in the art can implement the above-mentioned specific forms and settings in a well-known manner.

[0030] When an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0032] The strongly weathered rock stratum rotary drilling rig provided by the present invention is now described.

[0033] like Figure 1 and Figure 2 As shown, the first embodiment of the present invention provides a strongly weathered rock formation rotary drilling rig, including a drilling rig body 10, a mast mechanism 20, a machine-locked drill rod 30 and a double-flap pick drill bit 40, wherein the mast mechanism 20 is arranged on the drilling rig body 10; the machine-locked drill rod 30 is connected to the mast mechanism 20 so as to rotate and press downward under the drive of the mast mechanism 20; the double-flap pick drill bit 40 is connected to the machine-locked drill rod 30, and a flow hole 48 is provided on the side wall.

[0034] Compared with the prior art, the strongly weathered rock formation rotary drilling rig provided in the present embodiment can effectively improve the drilling efficiency through the cooperation of the machine-locked drill rod 30 and the double-petal pick drill bit 40, and the provision of the flow hole 48 on the side wall of the double-petal pick drill bit 40; because there are multiple locking points on the machine-locked drill rod 30, the power head of the mast mechanism 20 is interlocked with the locking points to perform mechanical locking, so that when encountering a relatively high-strength rock formation, the power head can effectively apply force to the drill bit to avoid slippage between the power head and the machine-locked drill rod 30, avoid drilling pressure loss, and help improve drilling efficiency; and the adopted double-petal pick drill bit 40 is not only suitable for relatively strong The drilling of rock formations can also allow the slag generated during the drilling process to enter the double-petal pick drill bit 40. At the same time, a flow hole 48 is opened on the side wall of the double-petal pick drill bit 40, so that during the drilling and lifting process, the smaller slag inside the double-petal pick drill bit 40 can flow out from the flow hole 48 with the mud, so that the double-petal pick drill bit 40 can accommodate more large pieces of slag, thereby reducing the number of reciprocating times and resistance of the drill bit lifting and lowering, which is beneficial to improving the drilling efficiency, reducing the energy consumption of the drilling operation, and is beneficial to the construction period and cost control of the drilling operation, and is also beneficial to environmental protection; it is very suitable for hole-forming operations in strongly weathered rock formations in the fields of pile foundations, oil and gas mineral mining, etc.

[0035] like Figure 2 and Figure 3 As shown, a specific implementation manner provided by the present invention based on the first implementation manner is as follows.

[0036] like Figure 2 As shown, in some specific embodiments, the double-flap pick drill bit 40 includes a connecting box 41, a first half-cylinder 42, a second half-cylinder 43, a first cutting plate 44 and a second cutting plate 45, the connecting box 41 is connected to the machine-locked drill rod 30; the first half-cylinder 42 is rotatably connected to the connecting box 41; the second half-cylinder 43 is rotatably connected to the connecting box 41, and can be assembled with the first half-cylinder 42 to form a cylindrical structure; the first cutting plate 44 is connected to the lower part of the first half-cylinder 42 and is inclined inwardly; the second cutting plate 45 is connected to the lower part of the second half-cylinder 43 and is inclined inwardly; wherein, the cutting sides of the first cutting plate 44 and the second cutting plate 45 are both provided with a plurality of cutting teeth 46, and the opposite sides of the cutting sides on the free ends of the first cutting plate 44 and the second cutting plate 45 abut against each other; the flow hole 48 is provided on the side wall of the first half-cylinder 42 and / or the second half-cylinder 43.

[0037] Furthermore, in order to improve the bearing capacity of the first cutting plate 44 and the second cutting plate 45, a limit assembly is provided at the abutment of the first cutting plate 44 and the second cutting plate 45 to prevent the first cutting plate 44 and the second cutting plate 45 from slipping and dislocating during rotary drilling, resulting in excessive wear and instability.

[0038] like Figure 3 As shown, in a specific embodiment, the limiting assembly includes a disassembly seat 471 and a limiting protrusion 472. The disassembly seat 471 is detachably connected to the first cutting plate 44 or the second cutting plate 45 by plugging, clamping or bolting; the limiting protrusion 472 is fixedly arranged on the disassembly seat 471 to support the relative disassembly seat 471, so that the first cutting plate 44 and the second cutting plate 45 can directly abut against each other. Specifically, the disassembly seat 471 and the limiting protrusion 472 can be an integrally formed structure, a welded structure or a bolted structure.

[0039] like Figure 4 and Figure 5 As shown, a specific implementation manner provided by the present invention based on the first implementation manner is as follows.

[0040] The strongly weathered rock formation rotary drilling rig further comprises a crushing assembly, which is arranged outside the side wall of the double-petal pick drill bit 40 and at the flow hole 48 to crush the passing slag.

[0041] An inner stopper is provided on the inner side of the side wall of the double-flap pick drill bit 40 . The inner stopper is located behind the flow hole 48 to block the mud or other fluids flowing through the flow hole 48 so that more mud or other fluids can enter the flow hole 48 .

[0042] Furthermore, an inner baffle plate 49 is provided on the inner baffle bar, and the inner baffle plate 49 is connected to the inner baffle plate on the side facing away from the rotation direction of the double-petal pick drill bit 40, and the inner baffle plate 49 covers the flow hole 48, and there is a gap between the inner side and the inner wall of the double-petal pick drill bit 40. This can not only increase the amount of fluid such as mud entering the flow hole 48, but also filter the oversized slag in the mud to prevent the oversized slag from being stuck in the flow hole 48.

[0043] In some specific embodiments, Figure 4 and Figure 5 As shown, the crushing assembly includes an elastic plate 51, a dynamic grinding plate 52 and a fixed grinding plate 53. The elastic plate 51 covers the outside of the flow hole 48, and is connected to the outer wall of the double-petal pick drill bit 40 on the side facing the rotation direction of the double-petal pick drill bit 40, and there is a gap between the inner side of the elastic plate 51 and the outer wall of the double-petal pick drill bit 40; the dynamic grinding plate 52 is fixedly arranged on the side of the elastic plate 51 facing the flow hole 48; the fixed grinding plate 53 is fixedly arranged on the side of the elastic plate 51 facing the flow hole 48, and its position is coordinated with the dynamic grinding plate 52 to grind the passing slag.

[0044] Since the elastic plate 51 protrudes from the outer wall of the double-petal drill bit 40, and the wall of the drill hole is not smooth, when the double-petal drill bit 40 is drilling, the elastic plate 51 is constantly in contact with the wall of the drill hole, causing the free end of the elastic plate 51 to undergo reciprocating deformation, that is, the distance between the free end of the elastic plate 51 and the outer wall of the double-petal drill bit 40 is constantly changing, causing the distance between the dynamic grinding plate 52 and the fixed grinding plate 53 to constantly change, thereby squeezing and grinding the passing slag, making the slag more broken and thus better dispersed in the mud without occupying the space inside the double-petal drill bit 40, thereby improving the drilling efficiency.

[0045] In order to improve the grinding efficiency, the dynamic grinding plate 52 and the fixed grinding plate 53 are made of high-strength alloy and have teeth on the surface so that the slag can be crushed more easily.

[0046] Furthermore, in some other specific embodiments, Figure 4 and Figure 5 As shown, the crushing assembly also includes a rotating seat 54, a rotating shaft 55, a pushing cam 56 and a driving wheel 57. The rotating seat 54 is arranged on the outer wall of the double-petal pick drill bit 40; the rotating shaft 55 is arranged on the rotating seat 54 to rotate in a vertical or inclined direction; the pushing cam 56 is arranged in the flow hole 48 and is fixedly connected to the rotating shaft 55; the driving wheel 57 is fixedly connected to the rotating shaft 55 to rotate with friction with the hole wall, thereby driving the pushing cam 56 to periodically push the elastic plate 51. In order to improve power transmission, the driving wheel 57 is a spherical structure with tooth patterns on the outside to improve durability and friction with the hole wall.

[0047] When in use, when the double-petal pick drill bit 40 rotates relative to the hole wall, the driving wheel 57 rotates due to the friction with the hole wall, thereby driving the push cam 56 to rotate through the rotating shaft 55. When the push cam 56 rotates, it will periodically push the elastic plate 51, so that the distance between the dynamic grinding plate 52 and the fixed grinding plate 53 is constantly changing, and the passing slag is squeezed and ground; in this way, the power of the double-petal pick drill bit 40 can be used to drive the elastic plate 51 to move, so as to extrude and grind the slag; at the same time, the push cam 56 can facilitate the flow of mud and slag in the flow hole 48 to avoid blockage.

[0048] In a specific embodiment, the push cam 56 is a circular wheel with a convex structure on the side, and the side of the convex structure facing the rotation direction is a smoothly set slope surface, and the side facing the rotation direction is a step surface, so that the push cam 56 can slowly push up the elastic plate 51, and after the elastic plate 51 is raised to the highest point, it can be quickly separated with the rotation of the push cam 56, so that the dynamic grinding plate 52 is quickly pressed down under the drive of the elastic plate 51, thereby improving the crushing efficiency. At the same time, the driving wheel 57 can also be a cam structure, and the protruding portion of the driving wheel 57 and the protruding structure of the push cam 56 maintain an angle of 5°-25°, that is, the protruding portion of the driving wheel 57 is located 5°-25° before the protruding structure of the push cam 56 in the rotation direction, so that before the push cam 56 pushes up the elastic plate 51, the protruding portion of the driving wheel 57 is facing the hole wall, thereby increasing the friction between the hole wall and the hole wall, and then obtaining a greater driving force, so that the push cam 56 can push up the elastic plate 51 more smoothly.

[0049] To facilitate the removal and installation of the elastic plate 51, a mounting seat 58 is provided on the outer wall of the double-petal pick drill bit 40. A mounting groove is provided in the mounting seat 58. The elastic plate 51 is connected and fixed in the mounting groove by welding, bolt connection or clamping.

[0050] In a specific embodiment, the elastic plate 51 is rotatably connected to the mounting seat 58 around a rotating shaft perpendicular to the outer wall of the double-petal cutter drill bit 40, and the mounting groove limits the elastic plate 51 so that the elastic plate 51 can swing, and the portion where the elastic plate 51 contacts the push cam 56 is provided with a top matching groove with the raised structure of the push cam 56, and the teeth on the movable grinding plate 52 and the fixed grinding plate 53 are staggered. When the push cam 56 contacts the elastic plate 51, it drives the elastic plate 51 to move outward and in the rotation direction of the push cam 56, so that the teeth on the dynamic grinding plate 52 and the fixed grinding plate 53 are dislocated, the slag on the tooth engagement side is ground, and the remaining slag between the dynamic grinding plate 52 and the fixed grinding plate 53 is moved driven by the mud; when the push cam 56 is separated from the elastic plate 51, the elastic plate 51 is pressed downward by the action of elasticity, and moves in the direction of rotation of the push cam 56 in the opposite direction under the cooperation of the elastic force and the teeth on the dynamic grinding plate 52 and the fixed grinding plate 53, so that the teeth grind the slag that has just moved, and the tooth engagement sides that have just moved are separated, and the ground slag moves driven by the mud; such a cycle can enhance the grinding and crushing of the slag.

[0051] In some embodiments, the movable grinding plate 52 and the fixed grinding plate 53 are both U-shaped plates or L-shaped plates to avoid the contact area between the flow hole 48 , the rotating shaft 55 , and the elastic plate 51 and the push cam 56 .

[0052] like Figure 6 and Figure 7 As shown, a specific implementation manner provided by the present invention based on the first implementation manner is as follows.

[0053] The strongly weathered rock formation rotary drilling rig also includes a mud circulation filtering mechanism 60. A rotating sleeve 61 is provided at the lower part of the machine-locked drill rod 30. The rotating sleeve 61 is rotatably connected to the machine-locked drill rod 30. A slurry suction head 62 is provided on the rotating sleeve 61. The slurry suction head 62 is connected to the mud circulation filtering mechanism 60 through a slurry conduit 63.

[0054] By rotating the sleeve 61, the slurry suction head 62 can be prevented from rotating randomly with the locked drill rod 30, and the slurry conduit 63 can be prevented from affecting the rotation of the machine-locked drill rod 30, so that the slurry conduit 63 can work while drilling, thereby improving the working efficiency; and through the negative pressure generated by the mud circulation filtering mechanism 60, the mud at the drill bit can be sucked out of the hole by the slurry suction head 62 and the slurry conduit 63 during drilling, and the coarser slag and the slag crushed by the crushing component can be separated and then introduced into the hole again. In this cycle, the slag in the hole can be continuously separated, and the number of reciprocating times of lifting and lowering the drill bit can be reduced, thereby improving the drilling efficiency and reducing the working energy consumption.

[0055] A hard connection ring 64 is provided on the outside of the slurry conduit 63, a ball bracket 65 is provided on the hard connection ring 64, and a ball assembly 66 is provided on the ball bracket 65. In this way, when the slurry conduit 63 is accidentally entangled on the machine-locked drill rod 30, the friction between the slurry conduit 63 and the machine-locked drill rod 30 can be reduced, thereby preventing the slurry conduit 63 from being entangled and causing danger.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A strongly weathered rock formation rotary drilling rig, characterized in that: include: Drilling machine body (10); A mast mechanism (20) is arranged on the drilling rig body (10); A machine-locked drill rod (30) is connected to the mast mechanism (20) so as to be rotated and pressed downward under the drive of the mast mechanism (20); A double-flap pick drill bit (40) connected to the machine-lock drill rod (30) and having a flow hole (48) on its side wall; The strongly weathered rock formation rotary drilling rig also includes: A crushing assembly is arranged outside the side wall of the double-flap pick drill bit (40) and at the flow hole (48) to crush the passing slag; An inner stop bar is provided on the inner side of the side wall of the double-petal pick drill bit (40), and the inner stop bar is located behind the flow hole (48); an inner stop plate (49) is also provided on the inner stop bar, and the inner stop plate (49) is connected to the inner stop bar on the side facing away from the rotation direction of the double-petal pick drill bit (40), and the inner stop plate (49) covers the flow hole (48), and there is a gap between the inner stop plate (49) and the inner wall of the double-petal pick drill bit (40); The crushing assembly comprises: The elastic plate (51) covers the outside of the flow hole (48) and is connected to the outer wall of the double-petal pick drill bit (40) on one side facing the rotation direction of the double-petal pick drill bit (40). There is a gap between the inner side of the elastic plate (51) and the outer wall of the double-petal pick drill bit (40). A dynamic grinding plate (52) is fixedly arranged on a side of the elastic plate (51) facing the flow hole (48); A fixed grinding plate (53) is fixedly arranged on a side of the elastic plate (51) facing the flow hole (48) and is positioned to match the dynamic grinding plate (52) to grind the passing slag; The fixed grinding plate (53) is connected to the double-flap pick drill bit (40); The crushing assembly also includes: A rotating seat (54) is arranged on the outer wall of the double-petal pick drill bit (40); A rotating shaft (55) is rotatably arranged on the rotating seat (54) in a vertical or inclined direction; A push cam (56) is disposed in the flow hole (48) and is fixedly connected to the rotating shaft (55); The driving wheel (57) is fixedly connected to the rotating shaft (55) so as to rotate by friction with the hole wall, thereby driving the pushing cam (56) to periodically push the elastic plate (51).

2. The strongly weathered rock formation rotary drilling rig according to claim 1, characterized in that: The double-flap pick drill bit (40) comprises: A connection box (41) connected to the machine-locked drill rod (30); A first half cylinder (42) is rotatably connected to the connection box (41); The second half cylinder (43) is rotatably connected to the connection box (41) and can be assembled with the first half cylinder (42) to form a cylindrical structure; A first cutting plate (44) connected to the lower portion of the first semi-cylinder (42) and inclined inwardly; A second cutting plate (45) is connected to the lower portion of the second semi-cylinder (43) and is inclined inwardly; The cutting sides of the first cutting plate (44) and the second cutting plate (45) are both provided with a plurality of cutting teeth (46), and the opposite sides of the cutting sides on the free ends of the first cutting plate (44) and the second cutting plate (45) are in contact with each other; the flow hole (48) is provided on the side wall of the first semi-cylinder (42) and / or the second semi-cylinder (43).

3. The strongly weathered rock formation rotary drilling rig according to claim 2, characterized in that: A limiting assembly is provided at the abutment point between the first cutting plate (44) and the second cutting plate (45); the limiting assembly comprises: A disassembly seat (471) detachably connected to the first cutting plate (44) or the second cutting plate (45); The limiting protrusion (472) is fixedly arranged on the disassembly and assembly seat (471).

4. The strongly weathered rock formation rotary drilling rig according to claim 1, characterized in that: The outer wall of the double-flap pick drill bit (40) is provided with a mounting seat (58), a mounting groove is provided in the mounting seat (58), and the elastic plate (51) is installed in the mounting groove by welding, bolt connection or clamping; the driving wheel (57) is a spherical structure with tooth patterns on the outside; the dynamic grinding plate (52) and the fixed grinding plate (53) are both U-shaped plates or L-shaped plates.

5. The strongly weathered rock formation rotary drilling rig according to claim 1, characterized in that: The strongly weathered rock formation rotary drilling rig further comprises a mud circulation filtering mechanism (60); a rotating sleeve (61) is provided at the lower part of the machine-locked drill rod (30); the rotating sleeve (61) is rotatably connected to the machine-locked drill rod (30); a slurry suction head (62) is provided on the rotating sleeve (61); the slurry suction head (62) is connected to the mud circulation filtering mechanism (60) via a slurry conduit (63).

6. The strongly weathered rock formation rotary drilling rig according to claim 5, characterized in that: The slurry conduit (63) is provided with a hard connection ring (64) on the outside, a ball support (65) is provided on the hard connection ring (64), and a ball assembly (66) is provided on the ball support (65).

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