Composite drill bit for rotary drilling rig

Abstract

The present invention discloses a composite drill bit for a rotary drilling rig, which relates to the technical field of building construction, and comprises: a rotating cylinder; a mounting ring, one side of which is hinged to the bottom of the rotating cylinder, and the other side of which is detachably connected to the bottom of the rotating cylinder through a fixing mechanism; two excavation mechanisms, both of which are mounted on the inner ring of the mounting ring, and the excavation mechanism comprises an inclined excavation plate, both sides of which have excavation shovel edges, and the excavation shovel edges are provided with a plurality of excavation drill teeth, and the two excavation shovel edges are respectively in a flat working state and an idle inclined state; a rotating mounting mechanism, which is arranged inside the mounting ring. The present invention can reverse the excavation direction of the two excavation mechanisms by the cooperation of the rotating mounting mechanism and the driving mechanism, that is, when in use, the excavation direction of the excavation mechanism can be cyclically adjusted according to needs, so as to avoid the excavation drill teeth of the excavation mechanism from heating and wearing due to long-term operation, and increase the service life of the drill bit.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a composite drill bit for a rotary drilling rig. Background Art

[0002] A rotary drilling rig is a large-scale engineering machinery and equipment, mainly used in pile foundation projects in infrastructure construction such as buildings, bridges, railways, and roads. It digs the soil and rocks underground by rotating the drill rod and drill bit to form a pile hole for subsequent pile foundation construction.

[0003] The drill bit of a rotary drilling rig is a very critical component in the construction of a rotary drilling rig, which directly affects the drilling efficiency and hole quality. There are many types of drill bits for rotary drilling rigs, suitable for different geological conditions and construction requirements. At present, the drill bits of rotary drilling rigs can only rotate and dig in one direction when in use. During long-term continuous operation, the friction of the drill teeth of the drill bit will generate heat, which will affect the service life of the drill teeth for a long time; at the same time, the current drill bit can only rotate and dig in one direction, and the excavation rotation direction of the drill bit cannot be changed. During the drilling operation, if a hard stone is encountered that is inclined along the excavation rotation direction of the drill bit, it is not easy to dig the stone. Summary of the invention

[0004] The purpose of the present invention is to provide a composite drill bit for a rotary drilling rig, which solves the problem that the drill bits of current rotary drilling rigs can only rotate in one direction when in use, and during long-term continuous operation, the drill teeth of the drill bit will generate heat due to long-term friction, which will affect the service life of the drill teeth.

[0005] The present invention solves the above technical problems through the following technical solutions, which include:

[0006] Rotating drum;

[0007] A mounting ring, one side of which is hinged to the bottom of the rotating drum, and the other side of which is detachably connected to the bottom of the rotating drum via a fixing mechanism;

[0008] Two digging mechanisms, both of which are mounted on the inner ring of the mounting ring, the digging mechanisms comprising an inclined digging plate, both sides of the inclined digging plate having digging edges, and the digging edges are provided with a plurality of digging drill teeth, the two digging edges are respectively in a flat working state and an idle inclined state;

[0009] A rotating installation mechanism is arranged inside the installation ring, and the rotating installation mechanism is used to rotatably install the two excavating mechanisms inside the installation ring;

[0010] The driving mechanism is arranged inside the rotating cylinder. When the mounting ring is closed and connected with the rotating cylinder, the driving mechanism is coupled with the rotating mounting mechanism. The cooperation between the driving mechanism and the rotating mounting mechanism can drive the two excavating mechanisms to rotate so as to exchange the two digging side states of the excavating mechanisms.

[0011] Preferably, the rotating mounting mechanism includes a mounting cross plate fixed to the inner wall of the mounting ring, and a first rotating shaft is rotatably mounted between both sides of the mounting cross plate and the inner wall of the mounting ring, and the corresponding excavation mechanism is fixedly connected to the corresponding first rotating shaft, and a first bevel gear is fixed on the two first rotating shafts, and a first mounting seat is fixed on the mounting cross plate, and a second bevel gear is rotatably mounted on the first mounting seat through a second rotating shaft, and the second bevel gear is meshingly connected to the two first bevel gears, and a U-shaped block is fixed to the upper end of the second rotating shaft.

[0012] Preferably, the driving mechanism includes a second mounting seat fixed to the top of the rotating cylinder, a motor is fixed on the second mounting seat, a transmission shaft is fixed to the output end of the motor, a latch block is fixed to the lower end of the transmission shaft, and when the mounting ring is closed and connected to the rotating cylinder, the latch block cooperates with the U-shaped block to realize transmission.

[0013] Preferably, the driving mechanism further comprises a bulldozer assembly, the bulldozer assembly comprises two first arc-shaped baffles fixed to the lower end of the second mounting seat, and the two first arc-shaped baffles are symmetrically arranged, the transmission shaft is located between the two first arc-shaped baffles, and a threaded section is processed on the transmission shaft, a push plate is sleeved on the transmission shaft, the first arc-shaped baffle slides through the push plate, two symmetrically arranged second arc-shaped baffles are fixed to the lower side of the push plate, and the two push plates and the second arc-shaped baffle are combined into a sealing structure;

[0014] A first spring is fixed to the lower end of the second mounting seat, and the first spring applies a downward force to the push plate. When the mounting ring is closed and connected to the rotating cylinder, the lower end of the second arc-shaped baffle abuts against the first mounting seat, so that the push plate moves up to realize the spiral of the threaded section being disengaged.

[0015] Preferably, a groove is formed on the side surface of the first arc-shaped baffle plate, and a protruding block is fixed on the side surface of the second arc-shaped baffle plate, and the protruding block is slidably disposed in the groove.

[0016] Preferably, a center drill is fixedly provided at the central portion of the lower surface of the mounting transverse plate, and the center drill comprises a conical block fixed to the lower surface of the mounting transverse plate, and a plurality of scraping blocks are annularly distributed on the outer surface of the conical block.

[0017] Preferably, the fixing mechanism comprises a snap ring fixed to the upper side of the mounting ring and a locking assembly and an unlocking assembly arranged inside the rotating cylinder;

[0018] The locking assembly comprises a sliding groove provided in the rotating cylinder and a locking groove connected with the sliding groove, a limiting slider slides in the sliding groove, one end of the limiting slider extends into the locking groove, and a first inclined surface is provided at the end of the limiting slider located in the locking groove, a second spring is provided in the sliding groove, and the second spring drives the limiting slider to move toward one side of the locking groove; a rectangular inner cavity is provided on the upper side of the sliding groove, a push block fixed to the limiting slider is provided in the rectangular inner cavity, and a second inclined surface is provided on the side of the push block close to the clamping ring;

[0019] The unlocking assembly is used to drive the limiting slider to move into the sliding groove.

[0020] Preferably, the unlocking assembly includes a vertical rod that slides through the rotating cylinder, and the lower end of the vertical rod extends into the rectangular inner cavity, a roller is rotatably mounted on the lower end of the vertical rod, a top block is fixed to the upper end of the vertical rod, and a third spring mounted on the vertical rod is provided between the top block and the rotating cylinder.

[0021] Preferably, a plurality of annularly distributed corner drill teeth are fixed to the lower surface of the mounting ring, and both ends of the corner drill teeth are provided with drill edges.

[0022] Preferably, a baffle plate is fixed to the outer edge of the upper surface of the inclined digging plate.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The present invention can reverse the digging direction of the two digging mechanisms by the cooperation of the rotating installation mechanism and the driving mechanism, that is, when in use, the digging direction of the digging mechanism can be cyclically adjusted according to needs, so as to avoid the digging teeth of the digging mechanism from heating and wearing due to long-term operation, thereby increasing the service life of the drill bit;

[0025] 2. The present invention can adjust the directions of the two excavation mechanisms according to the excavation needs, and then adjust the excavation direction of the drill bit to adapt to different geological environments, bringing convenience to the excavation operation;

[0026] 3. The present invention can conveniently close and open the installation ring, bringing convenience to the operators;

[0027] 4. The present invention can clean the soil remaining in the rotating drum without manual cleaning by the staff, which reduces the workload of the staff and makes the operation more convenient;

[0028] 5. The driving mechanism in the present invention can adjust the digging directions of the two digging mechanisms and can also drive the push plate to move vertically to clean the soil remaining in the rotating cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the explosion structure of the present invention;

[0031] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure inside the middle mounting ring;

[0032] Figure 4 for Figure 1 Schematic diagram of the internal structure of the middle rotating cylinder;

[0033] Figure 5 It is a schematic diagram of the main cross-sectional structure of the present invention;

[0034] Figure 6 for Figure 4 A schematic diagram of a top cross-sectional structure of the first arc-shaped baffle in FIG.

[0035] Figure 7 for Figure 4 A schematic diagram of the three-dimensional structure of the push plate in FIG.

[0036] Figure 8 It is a structural schematic diagram of the fixing mechanism in the present invention;

[0037] The numbers in the figure represent:

[0038] 1-rotating cylinder; 11-mounting base; 12-exhaust hole; 2-mounting ring; 21-corner drill teeth; 22-conical block; 23-scraper block; 3-fixing mechanism; 31-clamping ring; 321-limiting slider; 322-second spring; 323-push block; 331-roller; 332-vertical rod; 333-third spring; 334-top block; 4-digging mechanism; 41-inclined digging plate; 42-enclosing plate; 43 - digging shovel edge; 44-digging drill teeth; 5-rotating mounting mechanism; 51-mounting cross plate; 52-first rotating shaft; 53-first bevel gear; 54-first mounting seat; 55-U-shaped clamping block; 61-second mounting seat; 62-motor; 63-first arc baffle; 631-groove; 64-push plate; 65-second arc baffle; 651-protruding block; 66-first spring; 67-transmission shaft; 68-latch block. DETAILED DESCRIPTION

[0039] The above and other technical features and advantages of the present invention are described in more detail below in conjunction with the accompanying drawings.

[0040] This embodiment provides a technical solution: a composite drill bit for a rotary drilling rig, such as Figure 1-8As shown, it includes a rotating drum 1, a mounting ring 2, two excavating mechanisms 4, a rotating mounting mechanism 5 and a driving mechanism; a mounting base 11 is provided on the top of the rotating drum 1, and the mounting base 11 is used for mounting and fixing with the rotary drilling rig, and the two excavating mechanisms 4 and the rotating mounting mechanism 5 are both mounted on the mounting ring 2.

[0041] One side of the mounting ring 2 is hinged to the bottom of the rotating drum 1, and the other side is detachably connected to the bottom of the rotating drum 1 through a fixing mechanism 3, so that the connection state of the mounting ring 2 and the rotating drum 1 can be adjusted. When the other side of the mounting ring 2 is connected to the rotating drum 1 through the fixing mechanism 3, the mounting ring 2 can enter the working state and perform excavation operations. When the other side of the mounting ring 2 is separated from the rotating drum 1, the mounting ring 2 is not located below the rotating drum 1, so that the soil stored in the rotating drum 1 can be discharged.

[0042] The fixing mechanism 3 includes a snap ring 31 fixed to the upper side of the mounting ring 2 and a locking assembly and an unlocking assembly arranged inside the rotating cylinder 1. The locking assembly includes a sliding groove opened in the rotating cylinder 1 and a locking groove connected to the sliding groove. The locking groove is located at the bottom of the rotating cylinder 1. When the mounting ring 2 is closed, the snap ring 31 can be inserted into the locking groove. A limiting slider 321 slides in the sliding groove. One end of the limiting slider 321 extends into the locking groove. A first inclined surface is provided at the end of the limiting slider 321 located in the locking groove. The first inclined surface is located at the lower side of the limiting slider 321. A second spring 322 is provided in the sliding groove. The second spring 322 drives the limiting slider 321 to move toward one side of the locking groove. A rectangular inner cavity is opened on the upper side of the sliding groove. A push block 323 fixed to the limiting slider 321 is provided in the rectangular inner cavity. A second inclined surface is provided on the side of the push block 323 close to the snap ring 31. The unlocking assembly is used to drive the limiting slider 321 to move into the sliding groove.

[0043] The unlocking assembly includes a vertical rod 332 that slides through the rotating cylinder 1, and the lower end of the vertical rod 332 extends into the rectangular inner cavity, and the upper end penetrates the rotating cylinder 1. The lower end of the vertical rod 332 is rotatably mounted with a roller 331. The setting of the roller 331 can reduce the friction between the push block 323 and the vertical rod 332. A top block 334 is fixed to the upper end of the vertical rod 332, and a third spring 333 is provided between the top block 334 and the rotating cylinder 1 and is sleeved on the vertical rod 332. The action force of the third spring 333 will drive the vertical rod 332 to move upward. When not affected by other forces, the roller 331 will not contact the push block 323.

[0044] When the soil in the rotating drum 1 needs to be discharged, the rotating drum 1 is displaced upward by the rotary drilling rig so that the top block 334 contacts the corresponding part of the rotary drilling rig, the vertical rod 332 will be pushed downward and the third spring 333 will be compressed. In this process, the roller 331 will contact the second inclined surface, thereby pushing the push block 323 and the limiting slider 321 to move together, the limiting slider 321 will be disengaged from the locking groove, and the second spring 322 will be compressed. The clamping ring 31 will no longer be restricted by the limiting slider 321, and the mounting ring 2 will flip downward due to its own gravity, so that the soil in the rotating drum 1 can be discharged, and then the top block 334 will be pushed downward. 4 is not in contact with the corresponding position of the rotary drilling rig, the vertical rod 332 will return to the original position due to the force of the third spring 333, and the limiting slider 321 will also return to the original position due to the force of the second spring 322; when the installation ring 2 and the rotating cylinder 1 are closed by operating the rotary drilling rig, the snap ring 31 will be inserted into the locking groove, the snap ring 31 will contact the first inclined surface, and then push the limiting slider 321 to move into the sliding groove and compress the second spring 322 until the limiting slider 321 is inserted into the inner cavity of the snap ring 31 due to the force of the second spring 322, so that the installation ring 2 and the rotating cylinder 1 can be closed.

[0045] The components used for drilling and excavation in this embodiment include a center drill, corner drill teeth 21 and two excavation mechanisms 4. The center drill is arranged at the central part of the lower surface of the mounting cross plate 51. The center drill includes a conical block 22 fixed to the lower surface of the mounting cross plate 51. A plurality of scraper blocks 23 are distributed in an annular manner on the outer surface of the conical block 22. The scraper blocks 23 extend axially along the conical block 22, and can rotate in both directions to perform excavation work. There are a plurality of corner drill teeth 21, and the plurality of corner drill teeth 21 are distributed in an annular manner on the lower surface of the mounting ring 2. Both ends of the corner drill teeth 21 have drill blades, and can rotate in both directions to perform excavation work. The two excavation mechanisms 4 are both installed on the inner ring of the mounting ring 2.

[0046] The excavation mechanism 4 includes an inclined excavation plate 41. The overall structure of the inclined excavation plate 41 is a semicircular ring structure and is inclined. Both sides of the inclined excavation plate 41 have excavation edges 43, and a plurality of excavation drill teeth 44 are arranged at the excavation edges 43. The excavation drill teeth 44 are all inclined downward, so that excavation operations can be carried out. The two excavation edges 43 are respectively a working flat state and an idle inclined state, which can be replaced by a rotating mounting mechanism 5. The working flat state is a horizontal state, and the working flat state is used for excavation operations. The idle inclined state is an inclined setting. A baffle plate 42 is fixed to the outer edge of the upper surface of the inclined excavation plate 41, and the baffle plate 42 is used to block soil.

[0047] When the rotary drum 1 rotates, the digging edge 43 in the forward direction of the rotary drum 1 is in a flat state, so that soil can be excavated.

[0048] The rotating mounting mechanism 5 is arranged inside the mounting ring 2, and is used to rotatably mount the two excavating mechanisms 4 inside the mounting ring 2, so that the two digging edges 43 of the excavating mechanisms 4 can switch between a flat working state and an idle tilted state, thereby switching the excavation direction.

[0049] The rotating mounting mechanism 5 includes a mounting transverse plate 51 fixed to the inner wall of the mounting ring 2. The mounting transverse plate 51 passes through the center point of the mounting ring 2. First rotating shafts 52 are rotatably mounted between both sides of the mounting transverse plate 51 and the inner wall of the mounting ring 2, and the corresponding excavating mechanism 4 is fixedly connected to the corresponding first rotating shaft 52. For the stability of the excavating mechanism 4, the two can be connected through a connecting seat. First bevel gears 53 are fixed on the two first rotating shafts 52, and a first mounting seat 54 is fixed on the mounting transverse plate 51. The first mounting seat 54 is rotatably mounted with a second bevel gear 56 through a second rotating shaft, and the second bevel gear 56 is meshed with the two first bevel gears 53. A U-shaped block 55 is fixed to the upper end of the second rotating shaft.

[0050] When the second rotating shaft is driven to rotate by the driving mechanism, the two excavating mechanisms 4 can be driven to rotate a certain angle in opposite directions through the cooperation of the second bevel gear 56 and the two first bevel gears 53, so that the digging shovel edge 43 that was originally in an idle inclined state is converted to an operating flat state. When the digging shovel edge 43 in the operating flat state is converted to an idle inclined state, the excavation direction can be adjusted.

[0051] It should be noted that a protective cover may be installed on the first mounting seat 54 to cover the first bevel gear 53 and the first bevel gear 53 to prevent them from being covered by mud, so as to increase the stability of operation.

[0052] The driving mechanism is arranged inside the rotating cylinder 1. When the mounting ring 2 is closed and connected with the rotating cylinder 1, the driving mechanism is coupled with the rotating mounting mechanism 5. That is, the two excavating mechanisms 4 can be driven to rotate through the cooperation between the driving mechanism and the rotating mounting mechanism 5 to exchange the states of the two digging shovel edges 43 of the excavating mechanisms 4.

[0053] The driving mechanism includes a second mounting seat 61 fixed to the top of the rotating cylinder 1, and a motor 62 is fixed on the second mounting seat 61. A transmission shaft 67 is fixed to the output end of the motor 62, and a latch block 68 is fixed to the lower end of the transmission shaft 67. When the mounting ring 2 is closed and connected with the rotating cylinder 1, the latch block 68 cooperates with the U-shaped block 55 to realize transmission. It should be noted that before the mounting ring 2 is opened to discharge mud, the axis of the latch block 68 needs to be consistent with the direction of opening and flipping of the mounting ring 2 to ensure smooth separation and coupling between the U-shaped block 55 and the latch block 68.

[0054] When the motor 62 is running, the second rotating shaft is driven to rotate through the cooperation of the transmission shaft 67, the latch block 68 and the U-shaped block 55, and the two first rotating shafts 52 and the two excavating mechanisms 4 are driven to flip through the cooperation of the second bevel gear 56 and the two first bevel gears 53 to adjust the state of the excavating mechanism 4.

[0055] In an optional embodiment, the driving mechanism also includes a bulldozer assembly for quickly cleaning the soil in the rotating cylinder 1. The bulldozer assembly includes two first arc-shaped baffles 63 fixed to the lower end of the second mounting seat 61, and the two first arc-shaped baffles 63 are symmetrically arranged. The transmission shaft 67 is located between the two first arc-shaped baffles 63, and a threaded section is processed on the transmission shaft 67. It should be noted that the upper end of the transmission shaft 67 is within a certain size and the threaded section is not processed. A push plate 64 is sleeved on the transmission shaft 67. The outer diameter of the push plate 64 is adapted to the inner diameter of the rotating cylinder 1. The first arc-shaped baffle 63 slides through the push plate 64. Two symmetrically arranged second arc-shaped baffles 65 are fixed to the lower side of the push plate 64. The two push plates 64 and the second arc-shaped baffles 65 are combined into a sealing structure to prevent soil from sticking to the threaded section.

[0056] A first spring 66 is fixed to the lower end of the second mounting seat 61, and the first spring 66 applies a downward force to the push plate 64. When the mounting ring 2 is closed and connected with the rotating cylinder 1, the lower end of the second arc-shaped baffle plate 65 abuts against the first mounting seat 54, so that the push plate 64 moves up to realize the spiral of the threaded segment. That is, when the mounting ring 2 is closed, the push plate 64 will not engage with the threaded segment. When the state of the excavation mechanism 4 is changed, the push plate 64 will not be driven to move vertically. When the mounting ring 2 is opened, the push plate 64 will move downward under the action of the first spring 66, driving the push plate 64 to engage with the threaded segment. At this time, when the motor 62 is operated, the push plate 64 can be vertically displaced to clean the soil adhering to the inner wall of the rotating cylinder 1. When the push plate 64 is vertically displaced, the two second arc-shaped baffle plates 65 will be synchronously displaced with the push plate 64 to ensure that the soil does not enter the sealing structure.

[0057] In order to make the connection between the second arc baffle 65 and the first arc baffle 63 more stable, a groove 631 is opened on the side of the first arc baffle 63 , and a protruding block 651 is fixed on the side of the second arc baffle 65 , and the protruding block 651 is slidably set in the groove 631 .

[0058] An exhaust hole 12 opened in the rotating drum 1 is provided at the lower side of the push plate 64, which can facilitate the exhaust of air in the rotating drum 1 and avoid air compression in the rotating drum 1, thus bringing convenience to the excavation operation.

[0059] The above are only preferred embodiments of the present invention, which are only illustrative and not restrictive. Those skilled in the art understand that many changes, modifications, and even equivalences may be made to the present invention within the spirit and scope defined by the claims, but all of them will fall within the scope of protection of the present invention.

Claims

1. A composite drill bit for a rotary drilling rig, characterized in that: include: Rotating drum (1); A mounting ring (2), one side of which is hinged to the bottom of the rotating cylinder (1), and the other side of which is detachably connected to the bottom of the rotating cylinder (1) via a fixing mechanism (3); Two digging mechanisms (4), both of which are mounted on the inner ring of the mounting ring (2), the digging mechanisms (4) comprising an inclined digging plate (41), both sides of the inclined digging plate (41) having digging edges (43), and the digging edges (43) are provided with a plurality of digging drill teeth (44), and the two digging edges (43) are respectively in a flat working state and an idle inclined state; A rotating installation mechanism (5) is arranged inside the installation ring (2), and the rotating installation mechanism (5) is used to rotatably install the two excavating mechanisms (4) inside the installation ring (2); A driving mechanism is arranged inside the rotating cylinder (1); when the mounting ring (2) is closed and connected to the rotating cylinder (1), the driving mechanism is coupled with the rotating mounting mechanism (5); the cooperation between the driving mechanism and the rotating mounting mechanism (5) can drive the two excavating mechanisms (4) to rotate, so as to exchange the states of the two digging shovel edges (43) of the excavating mechanisms (4); The rotating mounting mechanism (5) comprises a mounting transverse plate (51) fixed to the inner wall of the mounting ring (2), first rotating shafts (52) are rotatably mounted between both sides of the mounting transverse plate (51) and the inner wall of the mounting ring (2), and the corresponding excavating mechanism (4) is fixedly connected to the corresponding first rotating shaft (52), and first bevel gears (53) are fixed on the two first rotating shafts (52), and a first mounting seat (54) is fixed on the mounting transverse plate (51), and a second bevel gear (56) is rotatably mounted on the first mounting seat (54) via a second rotating shaft, and the second bevel gear (56) is meshedly connected with the two first bevel gears (53), and a U-shaped clamping block (55) is fixed on the upper end of the second rotating shaft; The driving mechanism comprises a second mounting seat (61) fixed to the top of the rotating cylinder (1), a motor (62) being fixed on the second mounting seat (61), a transmission shaft (67) being fixed to the output end of the motor (62), a latch block (68) being fixed to the lower end of the transmission shaft (67), and when the mounting ring (2) is closed and connected with the rotating cylinder (1), the latch block (68) is matched and connected with the U-shaped clamping block (55) to realize transmission; The driving mechanism also includes a bulldozer assembly, which includes two first arc-shaped baffles (63) fixed to the lower end of the second mounting seat (61), and the two first arc-shaped baffles (63) are symmetrically arranged, the transmission shaft (67) is located between the two first arc-shaped baffles (63), and the transmission shaft (67) is processed with a threaded section, and a push plate (64) is sleeved on the transmission shaft (67), the first arc-shaped baffle (63) slides through the push plate (64), and two symmetrically arranged second arc-shaped baffles (65) are fixed to the lower side of the push plate (64), and the two push plates (64) and the second arc-shaped baffle (65) are combined into a sealing structure; A first spring (66) is fixed at the lower end of the second mounting seat (61), and the first spring (66) exerts a downward force on the push plate (64). When the mounting ring (2) is closed and connected with the rotating cylinder (1), the lower end of the second arc-shaped baffle plate (65) abuts against the first mounting seat (54), so that the push plate (64) moves upward to realize the spiral separation of the threaded section. A groove (631) is provided on the side of the first arc-shaped baffle plate (63), and a protruding block (651) is fixed on the side of the second arc-shaped baffle plate (65), wherein the protruding block (651) is slidably disposed in the groove (631).

2. The composite drill bit for rotary drilling rig according to claim 1, characterized in that: A center drill is fixedly arranged at the center of the lower surface of the mounting transverse plate (51), and the center drill comprises a conical block (22) fixed to the lower surface of the mounting transverse plate (51), and a plurality of scraping blocks (23) are distributed in an annular shape on the outer surface of the conical block (22).

3. The composite drill bit for rotary drilling rig according to claim 1, characterized in that: The fixing mechanism (3) comprises a snap ring (31) fixed to the upper side of the mounting ring (2) and a locking component and an unlocking component arranged inside the rotating cylinder (1); The locking assembly comprises a sliding groove provided in the rotating cylinder (1) and a locking groove connected to the sliding groove, a limiting slider (321) sliding in the sliding groove, one end of the limiting slider (321) extending into the locking groove, and a first inclined surface provided at the end of the limiting slider (321) located in the locking groove, a second spring (322) provided in the sliding groove, the second spring (322) driving the limiting slider (321) to move toward one side of the locking groove; a rectangular inner cavity is provided on the upper side of the sliding groove, a push block (323) fixed to the limiting slider (321) is provided in the rectangular inner cavity, and a second inclined surface is provided on the side of the push block (323) close to the retaining ring (31); The unlocking component is used to drive the limiting slider (321) to move into the sliding groove.

4. The composite drill bit for rotary drilling rig according to claim 3, characterized in that: The unlocking assembly comprises a vertical rod (332) which slides through the rotating cylinder (1), and the lower end of the vertical rod (332) extends into the rectangular inner cavity, a roller (331) is rotatably mounted on the lower end of the vertical rod (332), a top block (334) is fixed on the upper end of the vertical rod (332), and a third spring (333) which is sleeved on the vertical rod (332) is provided between the top block (334) and the rotating cylinder (1).

5. The composite drill bit for rotary drilling rig according to claim 1, characterized in that: A plurality of annularly distributed corner drill teeth (21) are fixed to the lower surface of the mounting ring (2), and both ends of the corner drill teeth (21) are provided with drill edges.

6. The composite drill bit for rotary drilling rig according to claim 1, characterized in that: A baffle plate (42) is fixed to the outer edge of the upper surface of the inclined digging plate (41).

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