Rotary drilling bit and rotary drilling rig having the same

Abstract

The present invention discloses a rotary drilling bit, comprising a drill barrel, a top plate located at the top of the drill barrel, and a bottom plate installed at the lower end of the drill barrel, wherein the top plate is provided with a connector for connecting a drill rod, the bottom plate comprises a fixed plate fixed to the drill barrel and a movable plate rotatably arranged on the fixed plate, the fixed plate is provided with a pick, the top plate is rotatably supported on the top of the drill barrel, an auxiliary cutting assembly is provided on the bottom plate, the auxiliary cutting assembly comprises a plurality of high-speed sub-drill bits distributed in a horizontal direction, which are coupled to the top plate through a transmission shaft and can be lifted and lowered relative to the bottom plate, an auxiliary feeding mechanism for manipulating the lifting and lowering of the auxiliary cutting assembly is arranged in the drill barrel, a locking structure is provided between the transmission shaft and the drill barrel, and the drill barrel and the transmission shaft can be locked when the top plate is reversed. When dealing with hard rock formations, the rotary drilling bit of the present invention can first form small holes on the surface of the rock formation with the help of the high-speed sub-drill bits, and then break them with the help of the pick, thereby achieving low-cost and high-efficiency excavation of the hard rock formations.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering excavation equipment and relates to a rotary drilling bit and a rotary drilling rig with the drill bit. Background Art

[0002] The rotary drilling rig is the most widely used construction equipment in the foundation drilling operations of municipal construction, highway bridges, high-rise buildings, etc. At present, when dealing with hard rock formations with high hardness, the main method of excavation is to use a cone ring-shaped barrel drill bit. However, the cone is expensive and needs to be replaced after excavating a certain distance, which greatly increases the construction cost, and there is always a problem of low excavation efficiency. Summary of the invention

[0003] To solve the above problems, the first object of the present invention is to provide a rotary drilling drill bit that can achieve excavation of hard rock formations at a lower cost and with high efficiency.

[0004] To achieve the above purpose, the technical solution of the present invention is as follows:

[0005] A rotary drilling drill bit comprises a drill barrel, a top plate located at the top of the drill barrel and a bottom plate installed at the lower end of the drill barrel, wherein the top plate is provided with a connector for connecting a drill rod, the bottom plate comprises a fixed plate fixed to the drill barrel and a movable plate rotatably arranged on the fixed plate, and a pick is arranged on the fixed plate, wherein the top plate is rotatably supported on the top of the drill barrel in a one-way meshing manner, an auxiliary cutting assembly is arranged on the bottom plate, the auxiliary cutting assembly comprises a plurality of high-speed sub-drill bits distributed in a horizontal direction, which are coupled to the top plate through a transmission shaft and can be lifted and lowered relative to the bottom plate, and an auxiliary feeding mechanism for manipulating the lifting and lowering of the auxiliary cutting assembly is arranged in the drill barrel;

[0006] When the top plate rotates forward under the drive of the drill rod, the top plate and the drill tube are rigidly combined into one; when the drill rod drives the top plate to rotate in the opposite direction, the top plate and the drill tube are separated, and then the high-speed sub-drill bits are driven to rotate through the transmission shaft, and the auxiliary feeding mechanism pushes the auxiliary cutting assembly to feed downward;

[0007] A locking structure is provided between the transmission shaft and the drill tube. When the top plate is reversed, the drill tube and the transmission shaft can be locked, so that the movable plate rotates relative to the fixed plate, thereby closing the lower end of the drill tube.

[0008] According to the above structure, under normal circumstances, the rotary drill bit performs conventional excavation in the first excavation posture with the help of the drill barrel and the cutting teeth at the lower end of the drill barrel. When encountering a hard rock formation with greater construction difficulty, it switches to the second excavation posture, the drill barrel and the cutting teeth stop running, and the drill rod is used to drive the high-speed sub-drill bit to rotate, first drilling a hole of a certain depth on the surface of the rock formation, and then switching to the first excavation posture, using the cutting teeth to crush and excavate the rock formation, avoiding hard grinding of the cutting teeth on the surface of the rock formation, thereby achieving efficient excavation of hard rock formations at a relatively low cost; after excavating to a certain depth, the drive shaft and the drill barrel are locked, and the drill rod is rotated in the opposite direction to reverse the top plate and the drill barrel, so that the bottom of the drill barrel is closed through the relative rotation of the moving plate and the fixed plate, so as to lift the drill bit upward and remove soil and other debris in the drill barrel.

[0009] Furthermore, a one-way tooth portion is circumferentially provided at the top of the drill tube, and a one-way ratchet matched with the one-way tooth portion is provided at the outer edge of the top plate, thereby simply and reliably realizing one-way engagement of the top plate and the drill tube.

[0010] Furthermore, a coupling portion extending downward is provided at the center of the top plate, and a sliding sleeve is fixedly provided at the upper end of the transmission shaft, and the sliding sleeve is splined with the coupling portion and can slide along the coupling portion. According to the above structure, the auxiliary cutting assembly can be provided with stable and reliable power output through the transmission shaft, and the auxiliary cutting assembly can be lifted and lowered when working.

[0011] The auxiliary cutting assembly includes a gear box and a plurality of transmission gears installed side by side in the gear box, the adjacent transmission gears mesh with each other, the lower end of the transmission shaft is coupled to one of the transmission gears, the upper end of each high-speed drill bit is fixed to the corresponding transmission gear, and the bottom plate is provided with a guide for supporting the gear box. This structure helps to ensure the compactness of the auxiliary cutting assembly and improve the transmission efficiency.

[0012] The auxiliary feeding mechanism includes a motor and a worm gear lift driven by the motor, the end of the lifting rod of the worm gear lift is connected to a pressure plate, the pressure plate is fixed to a sliding sleeve, the drill tube is fixed with an upper support plate and a lower support plate parallel to each other near its upper end, the top plate is supported on the upper support plate, the upper support plate and the lower support plate together form a accommodating chamber for accommodating the auxiliary feeding mechanism, the motor and the worm gear lift are both fixed on the lower support plate, and the sliding sleeve can slidably pass through the lower support plate.

[0013] According to the above structure, when the top plate rotates in the opposite direction and the rotary drill bit performs rotary excavation in the second excavation posture, the worm gear elevator driven by the motor drives the pressure plate and the sleeve to move, thereby realizing the feeding of the auxiliary cutting assembly. When switching to the first excavation posture, the auxiliary feeding mechanism is used to lift the auxiliary cutting assembly to an appropriate height to avoid interference with the cutting teeth on the end face of the bottom plate.

[0014] Furthermore, at least one upwardly extending limit pin is fixed on the upper surface of the sliding sleeve, and a limit groove is provided on the lower surface of the upper support plate at the position corresponding to the limit pin. When the pressure plate is lifted upward by the worm gear elevator, the limit pin on the sliding sleeve can be embedded in the corresponding limit groove, thereby realizing the locking of the transmission shaft and the drill barrel.

[0015] In order to limit the top plate in the height direction, the upper end surface of the drill tube is provided with a flange extending radially inward, and the top plate is defined between the flange and the upper support plate.

[0016] The upper support plate and the lower support plate are connected to each other through a guide pipe that passes through the top and bottom, and guide holes are distributed on the top plate. When the rotary drill bit is excavating, mud and other debris can be guided to be discharged upward through the guide pipe and the guide hole, reducing the excavation resistance and further improving the efficiency.

[0017] A power supply battery for supplying power to the motor is installed on the lower support plate. The power supply battery is installed near the motor, eliminating the need for additional power supply lines, thereby improving the compactness of the device.

[0018] The present invention also discloses a rotary drilling rig, comprising a drill arm and a drill rod supported on the drill arm, the end of the drill rod being connected to the above-mentioned rotary drilling bit, a first acoustic wave excitation analyzer and a first acoustic signal receiving sensor being installed in the rotary drilling bit, and a second acoustic wave excitation analyzer and a second acoustic signal receiving sensor being installed on the drill arm, which can communicate with the first acoustic wave excitation analyzer and the first acoustic signal receiving sensor.

[0019] According to the above structure, data related to the working status of the drill bit can be obtained through sound signals, and the drill bit advance can be controlled, thereby realizing data interaction between the drill bit and the external control system in a wireless manner, avoiding interference with the operation of the drill bit and ensuring the reliability of data transmission.

[0020] Beneficial effects:

[0021] The rotary drilling bit and the rotary drilling rig with the drill bit of the present invention can first form small holes on the surface of the rock formation with the help of the high-speed sub-drill bit and then break them with the help of the cutting teeth when dealing with hard rock formations, thereby achieving low-cost and high-efficiency excavation of the hard rock formations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A longitudinal cross-sectional view of the rotary drilling drill bit of the present invention;

[0023] Figure 2 It is a three-dimensional structural schematic diagram of the rotary drilling drill bit of the present invention;

[0024] Figure 3 It is a partial structural schematic diagram of the installation position of the middle pressure plate and the upper support plate of the present invention;

[0025] Figure 4 It is a schematic diagram of the structure of the top plate and the drill tube in the present invention;

[0026] Figure 5 This is a schematic diagram of the three-dimensional structure of the rotary drilling bit of the present invention after the top plate and the drill barrel are hidden;

[0027] Figure 6 This is a schematic diagram of the structure of the bottom plate when viewed from one side of the bottom;

[0028] Figure 7 It is a structural schematic diagram of the auxiliary feeding mechanism;

[0029] Figure 8 for Figure 7 The structural schematic diagram after the pressure plate is hidden;

[0030] Fig. 9 is a schematic diagram of the structure of the auxiliary cutting assembly;

[0031] Fig.10 It is a structural schematic diagram of the rotary drilling rig in the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the embodiments and drawings, wherein, unless otherwise specified, terms such as upper, lower, etc. indicating orientation refer to the orientation of the drilling rig as shown in the drawings during normal excavation. In addition, the following embodiments are examples for illustrating the present invention, and the present invention is not limited to the embodiments.

[0033] like Figure 1 and Figure 2 The rotary drilling bit shown includes a drill barrel 1 with a hollow cylindrical structure, with a top plate 2 and a bottom plate 3 respectively installed at the upper and lower ends of the drill barrel 1. The top plate 2 has a connector 21 for connecting a drill rod, and a plurality of cutting teeth 31 are installed on the end surface of the bottom plate 3. Different from a traditional rotary drilling bit, in this embodiment, the top plate 2 is rotatably supported on the top of the drill barrel 1.

[0034] The upper end face of the drill barrel 1 has a flange 14 extending radially inward, and the flange 14 can be fixed to the end face of the drill barrel 1 by welding or bolting. The inner wall of the drill barrel 1 is provided with an upper support plate 12 at a position adjacent to the flange 14. The upper support plate 12 can be fixed to the drill barrel by welding, or formed integrally with the drill barrel 1. The top plate 2 is positioned between the flange 14 and the upper support plate 12, and can rotate around the center line of the drill barrel 1 without moving up and down.

[0035] Figure 4The flange 14 at the upper end of the drill barrel 1 is hidden, so as to show in detail the matching structure of the top plate 2 and the drill barrel 1. It can be seen that a one-way tooth portion 11 is provided on the circumferential inner wall at the top of the drill barrel 1, and a plurality of one-way ratchets 22 matched with the one-way tooth portion 11 are provided on the outer edge of the top plate 2. Therefore, when the top plate 2 rotates forwardly driven by the drill rod not shown in the figure, the top plate 2 and the drill barrel 1 can be rigidly combined into one and rotate together, and when the top plate 2 rotates reversely, it is separated from the drill barrel 1 and rotates independently.

[0036] It should be understood that the one-way engagement of the top plate 2 and the drill barrel 1 can also be achieved by other structures. For example, a clutch or locking mechanism is configured between the top plate 2 and the drill barrel 1 to combine or disconnect the top plate 2 and the drill barrel 1 when necessary, which can also achieve the same or similar effects.

[0037] An auxiliary cutting assembly 4 is provided on the bottom plate 3, and the auxiliary cutting assembly 4 includes a plurality of high-speed sub-drill bits 41 arranged vertically and distributed in an array in the horizontal direction. The auxiliary cutting assembly 4 is coupled to the top plate 2 through a transmission shaft 5 located at the center of the drill barrel 1. A joint 23 extending vertically downward is provided at the center of the top plate 2. A sliding sleeve 51 is fixed to the upper end of the transmission shaft 5, and the sliding sleeve 51 is splined with the joint 23. When the top plate 2 rotates in the opposite direction, it can drive the transmission shaft 5 to rotate. While realizing power transmission, the transmission shaft 5 can slide axially along the joint 23, thereby driving the auxiliary cutting assembly 4 to rise and fall.

[0038] The inner wall of the drill tube 1 is provided with a lower support plate 13 parallel to the upper support plate 12 below the upper support plate 12, and an auxiliary feeding mechanism 6 is installed in the accommodating chamber 1a formed by the upper support plate 12 and the lower support plate 13, which is used to drive the auxiliary cutting assembly 4 to rise and fall through the transmission shaft 5.

[0039] The upper support plate 12 and the lower support plate 13 are connected to each other through four guide pipes 7 that pass through the upper and lower parts, and guide holes 2a corresponding to the guide pipes 7 are formed on the end surface of the top plate 2. During the excavation process, mud and other fluids can be guided to be discharged from above the drilling tool through the guide pipes 7 and the guide holes 2a, thereby reducing the excavation resistance.

[0040] Figure 7 and Figure 8The specific structure of the auxiliary feeding mechanism 6 is shown, which includes a motor 61 and two groups of worm gear lifts 62 driven by the motor 61. The motor 61 and the worm gear lifts 62 are both installed on the lower support plate 13. A through hole 13a is provided in the center of the support plate 13, so that the sleeve 51 can pass through the through hole 13a. The two groups of worm gear lifts 62 have a total of four vertically arranged lifting rods 63, which are symmetrically arranged on the circumferential periphery of the through hole 13a. The upper ends of the four lifting rods 63 jointly support a disc-shaped pressure plate 64. The end of the sleeve 51 is fixed to the center of the pressure plate 64, and the joint 23 of the top plate 2 is allowed to extend into the sleeve 51 from above in a spline-fitting manner. The pressure plate 64 can be lifted and lowered under the drive of the lifting rod 63 of the worm gear lift 62, thereby driving the sleeve 51 and the transmission shaft 5 to slide up and down along the axial direction of the joint 23.

[0041] The motor 61 is installed on the outer edge of one side of the through hole 13a and is located in the middle position of the two sets of worm gear elevators 62 to ensure smoothness and synchronization of the transmission. A converter 66 is also provided between the motor 61 and the two sets of worm gear elevators 62 to facilitate power transmission and adjust to a suitable speed ratio.

[0042] Power supply batteries 65 are installed on the outside of the two groups of worm gear elevators 62 for supplying power to the motor 61. The power supply batteries 65 on both sides are symmetrically arranged to ensure balance.

[0043] like Figure 5 and Figure 6 As shown, the base plate 3 includes a fixed plate 32 fixed to the lower end of the drill barrel 1, and a movable plate 33 rotatably arranged on the fixed plate 32. The fixed plate 32 and the movable plate 33 are roughly in the shape of fan blades, and the pick teeth 31 are distributed in an array on one side edge of the fixed plate 32. When the drill barrel 1 rotates forward during excavation, the movable plate 33 is positioned on the fixed plate 32, and the end of the drill barrel 1 is in an open state to facilitate normal excavation; when the drill barrel 1 rotates in the reverse direction, the fixed plate 32 releases the constraint on the movable plate 33, and the movable plate 33 can rotate relative to the fixed plate, so that the end of the drill barrel 1 is closed, which is convenient for extracting soil, cores, etc. in the drill barrel when the drill bit is withdrawn.

[0044] Figure 3 The structure of the installation position of the pressure plate 64 and the upper support plate 12 is shown. The upper end of the sliding sleeve 51 passes over the pressure plate 64 and extends radially outward to form a docking plane 510. The docking plane 510 is fitted onto the pressure plate 64 and is provided with a plurality of positioning pins 511 extending upward. The positioning pins 511 are evenly distributed along the circumference of the docking plane 510 and are fixed to the sliding sleeve 51 as a whole. The lower surface of the upper support plate 12 is provided with limiting grooves 121 corresponding to each positioning pin 641.

[0045] With the help of the locking structure formed by the locating pin 511 and the limiting groove 121, when the sleeve 51 is lifted to an appropriate position along with the pressure plate 64 driven by the worm gear elevator 62, the locating pin 511 can extend into the corresponding limiting groove 121. Therefore, the transmission shaft 5 and the drill barrel 1 are locked together, and the drill barrel 1 can rotate together with the top plate 2. A first acoustic wave excitation analyzer 15 and a first acoustic signal sensor 16 are also installed at the bottom of the upper support plate 12.

[0046] A guide portion 34 protruding upward is provided on the outer edge of one side of the moving piece 33 for supporting the auxiliary cutting assembly 4. The guide portion 34 is a box-shaped structure with an open lower end.

[0047] Combination Figure 8 It can be seen that the auxiliary cutting assembly 4 includes a gear box 42, which is constructed as a box-shaped structure adapted to the guide portion 34 and can slide up and down in the guide portion 34. A plurality of transmission gears 43 are arranged side by side along its length direction in the gear box 42, and adjacent transmission gears 43 are meshed with each other. The upper end of the high-speed sub-drill bit 41 extends into the gear box 42 and is fixed to the corresponding transmission gear 43. The lower end of the transmission shaft 5 is connected to a transmission gear 43 located at the center of the gear box 42 through a coupling 52 to drive the transmission gear 43 and the high-speed sub-drill bit 41 to rotate.

[0048] Fig.10 A rotary drilling rig is shown, comprising a carrier 10, a drill arm 8 and a drill rod 9 supported on the drill arm 8, the above-mentioned rotary drilling bit is connected to the lower end of the drill rod 9, because the traditional wireless transmission method cannot transmit over a long distance in the drilling well, and the wired communication will interfere with the normal operation of the drilling rig, therefore, the rotary drilling rig of this embodiment uses acoustic wave signals for data communication, and a second acoustic wave excitation analyzer 81 and a second acoustic signal receiving sensor 82 that can communicate with the first acoustic wave excitation analyzer 15 and the first acoustic signal receiving sensor 16 are installed on the drill arm 8.

[0049] The first acoustic wave excitation analyzer 15 can obtain parameters reflecting the working status of the drill bit, such as the temperature of the drill bit position, the excavation depth, etc., and convert them into acoustic wave signals and transmit them upward along the drill rod 9. The second acoustic signal receiving sensor 82 can receive the acoustic wave signal and transmit it to the control system after decoding. The control command issued by the control system is converted into an acoustic wave signal by the second acoustic wave excitation analyzer 81 and transmitted to the first acoustic signal receiving sensor 16 to control the drill bit.

[0050] Based on the above structure, when the rotary drill bit of this embodiment is normally excavating, the top plate 2 rotates forwardly driven by the drill rod. At this time, the top plate 2 and the drill barrel 1 are rigidly combined into one, working in the first excavation posture, and the cutting teeth 31 on the lower end bottom plate 3 are used to break the surface of the excavated rock formation.

[0051] When encountering a harder rock formation, the drill rod drives the top plate 2 to rotate in the opposite direction and move in the second excavation posture. At this time, the top plate 2 is separated from the drill barrel 1, and the drill barrel 1 remains stationary under the friction of the well wall. The top plate 2 drives the transmission shaft 5 to rotate through the joint 23, and then drives the high-speed sub-drill bit 41 to rotate at high speed through the transmission gear 43. During the process, the auxiliary feeding mechanism 6 is started synchronously, and the motor 61 drives the worm gear elevator 62 to move, and pushes the sleeve 51 and the transmission shaft 5 downward through the pressure plate 64, so as to realize the feeding of the high-speed sub-drill bit 41, thereby drilling a certain number of holes on the rock formation surface first.

[0052] Then the drill rod drives the top plate 2 to rotate forward, and the auxiliary cutting assembly 4 is lifted above the pick 31 to restore the first excavation posture. By drilling holes on the rock surface, the pick 31 can be broken with less effort. Compared with traditional tooth-shaped ring-shaped barrel drill bits, it can greatly reduce excavation costs and improve efficiency.

[0053] After excavating to a certain depth, the transmission shaft 5 is locked with the drill barrel 1 by using the locking structure, the drill rod 9 drives the drill barrel 1 to rotate in the opposite direction, the movable plate 33 rotates relative to the fixed plate 32, the lower end of the drill barrel 1 is closed, and the drill bit is lifted up to remove the soil and other debris in the drill bit.

[0054] Since the rotation directions of two adjacent transmission gears 43 are opposite, in order to ensure the consistency of drilling, the rotation directions of the chip grooves of adjacent high-speed sub-drills 41 can be set to be opposite, or another transmission gear 43 can be set between adjacent high-speed sub-drills 41.

[0055] In addition, in addition to the above-mentioned electric drive structure, the auxiliary feeding mechanism 6 can also adopt hydraulic or other mechanical drive methods. Its structure is not limited to the worm gear lift 62. Other types of lifting structures can still achieve similar effects without affecting the rotation of the drill barrel 1 and the top plate 2.

[0056] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention, and such changes all fall within the scope of protection of the present invention.

Claims

1. A rotary drilling bit, comprising a drill tube (1), a top plate (2) located at the top of the drill tube (1), and a bottom plate (3) mounted at the bottom of the drill tube (1), wherein the top plate (2) is provided with a connector (21) for connecting a drill rod, and the bottom plate (3) comprises a fixed plate (32) fixed to the drill tube (1) and a movable plate (33) rotatably arranged on the fixed plate (32), wherein a pick (31) is provided on the fixed plate (32). Features: The top plate (2) is rotatably supported on the top of the drill tube (1) in a one-way meshing manner; an auxiliary cutting assembly (4) is provided on the bottom plate (3); the auxiliary cutting assembly (4) comprises a plurality of high-speed sub-drill bits (41) distributed in a horizontal direction, which are coupled to the top plate (2) via a transmission shaft (5) and can be raised and lowered relative to the bottom plate (3); an auxiliary feeding mechanism (6) for controlling the raising and lowering of the auxiliary cutting assembly (4) is provided in the drill tube (1); When the top plate (2) rotates forwardly under the drive of the drill rod, the top plate (2) and the drill tube (1) are rigidly combined into one; when the drill rod drives the top plate (2) to rotate reversely, the top plate (2) and the drill tube (1) are separated, and then the high-speed drill bits (41) are driven to rotate through the transmission shaft (5), and the auxiliary feeding mechanism (6) pushes the auxiliary cutting assembly (4) to feed downward; A locking structure is provided between the transmission shaft (5) and the drill tube (1). When the top plate (2) is reversed, the drill tube (1) and the transmission shaft (5) can be locked, so that the movable plate (33) rotates relative to the fixed plate (32), thereby closing the lower end of the drill tube (1); A coupling portion (23) extending downward is provided at the center of the top plate (2), and a sliding sleeve (51) is fixedly provided at the upper end of the transmission shaft (5); the sliding sleeve (51) is spline-matched with the coupling portion (23) and is capable of sliding along the coupling portion (23); The auxiliary feeding mechanism (6) comprises a motor (61) and a worm gear lift (62) driven by the motor (61); the end of the lifting rod (63) of the worm gear lift (62) is connected to a pressure plate (64); the pressure plate (64) is fixed to the sliding sleeve (51); the drill tube (1) is fixed with an upper support plate (12) and a lower support plate (13) parallel to each other near its upper end; the top plate (2) is supported on the upper support plate (12); the upper support plate (12) and the lower support plate (13) are enclosed to form a accommodating chamber (1a) for accommodating the auxiliary feeding mechanism (6); the motor (61) and the worm gear lift (62) are both fixed on the lower support plate (13); the sliding sleeve (51) can slidably pass through the lower support plate (13).

2. The rotary drilling drill bit according to claim 1, Features: The top of the drill tube (1) is provided with a one-way tooth portion (11) in the circumferential direction, and the outer edge of the top plate (2) is provided with a one-way ratchet (22) adapted to the one-way tooth portion (11).

3. The rotary drilling drill bit according to claim 1, Features: The auxiliary cutting assembly (4) comprises a gear box (42) and a plurality of transmission gears (43) installed side by side in the gear box (42), wherein adjacent transmission gears (43) mesh with each other, the lower end of the transmission shaft (5) is coupled to one of the transmission gears (43), the upper end of each high-speed drill bit (41) is fixed to the corresponding transmission gear (43), and the base plate (3) is provided with a guide portion (34) for supporting the gear box (42).

4. The rotary drilling drill bit according to claim 3, Features: At least one upwardly extending limiting pin (511) is fixed on the upper surface of the sliding sleeve (51), and a limiting groove (121) is provided on the lower surface of the upper support plate (12) at a position corresponding to the limiting pin (511).

5. The rotary drilling drill bit according to claim 1, Features: The upper end surface of the drill tube (1) is provided with a flange (14) extending radially inwards, and the top plate (2) is defined between the flange (14) and the upper support plate (12).

6. The rotary drilling drill bit according to claim 1, Features: The upper support plate (12) and the lower support plate (13) are connected to each other via a flow guide pipe (7) that passes through from top to bottom, and flow guide holes (2a) are distributed on the top plate (2).

7. The rotary drilling drill bit according to claim 1, Features: A power supply battery (65) for supplying power to the motor (61) is installed on the lower support plate (13).

8. A rotary drilling rig, comprising a drill arm (8) and a drill rod (9) supported on the drill arm (8), wherein the end of the drill rod (9) is connected to a rotary drilling bit as claimed in any one of claims 1 to 7, Features: A first acoustic wave excitation analyzer (15) and a first acoustic signal receiving sensor (16) are installed in the rotary drilling bit, and a second acoustic wave excitation analyzer (81) and a second acoustic signal receiving sensor (82) capable of communicating with the first acoustic wave excitation analyzer (15) and the first acoustic signal receiving sensor (16) are installed on the drill arm (8).

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