A PDC drill bit adaptable to geology

Abstract

The present invention discloses a PDC drill bit that can adapt to different geologies, and relates to the technical field of drill bits. The present invention includes a threaded mounting block, the top of the threaded mounting block is fixedly connected to a mounting column, the top of the mounting column is rotatably connected to a drill bit body, the top of the drill bit body is fixedly connected to a blade, the bottom of the drill bit body is provided with an output shaft groove, and the top of the drill bit body is provided with an adaptive adjustment mechanism; the adaptive adjustment mechanism includes a chamber, an oil chamber, a connecting path and a tooth palm, the chamber is provided inside the mounting column, and the oil chamber is provided at the top of the drill bit body. The present invention, through the setting of the adaptive adjustment mechanism, makes it possible to turn on a micro motor to drive the threaded rod to rotate according to different geologies when the drill bit body is used for drilling. At this time, the height of the roller drill bit body can be adjusted by cooperating with components such as a lifting column, a piston ring, an oil chamber, and a piston rod to adapt to drilling work in different geologies.

Description

Technical Field

[0001] The present invention relates to the technical field of drill bits, in particular to a PDC drill bit that can adapt to geology. Background Art

[0002] PDC drill bit is the abbreviation of polycrystalline diamond composite drill bit. It is made of polycrystalline diamond (thin disc shape) into small cutting blocks embedded or sintered into the drill bit body. It is suitable for soft to medium hard formations, has very high hardness and wear resistance, and can be used for drilling in extreme geological conditions.

[0003] Patent document CN115324485B discloses an adaptive PDC composite drill bit, including a plurality of roller bits and a drill bit body with PDC cutting teeth. The roller bit includes a roller and a tooth palm connected to the roller. The tooth palm is provided with a boss for connecting to the drill bit body. The bottom of the boss is provided with a single or multiple elastic structures for providing elastic support to the roller bit.

[0004] In the above application document, an elastic structure for providing elastic support to the roller drill bit is provided individually or in multiples at the bottom of the boss, so that the distance between the roller itself and the drill body and the PDC drill bit can be adjusted according to different pressures when the drill bit is drilling, that is, adaptive ability is obtained, thereby improving the service life of the drill bit. The roller drill bit is provided with an elastic support structure. When drilling the ground or rock, the roller itself may retreat under pressure, resulting in insufficient drilling force, which is likely to affect the overall drilling efficiency and is not conducive to the progress of the project. Therefore, it needs to be improved. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a PDC drill bit that can adapt to geological conditions and solves the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a PDC drill bit that can adapt to geological conditions, comprising a threaded mounting block, the top of the threaded mounting block is fixedly connected to a mounting post, the top of the mounting post is rotatably connected to a drill bit body, the top of the drill bit body is fixedly connected to a blade, the bottom of the drill bit body is provided with an output shaft groove, the top of the drill bit body is provided with an adaptive adjustment mechanism; the adaptive adjustment mechanism includes a warehouse body, an oil chamber, a connecting path and a tooth palm, the warehouse body is provided inside the mounting post, the oil chamber is provided on the top of the drill bit body, a micro motor is provided inside the warehouse body, and the output shaft of the micro motor is fixed The cam is fixedly connected with a threaded rod, the internal piston of the oil chamber is slidably connected with a piston ring, the interior of the oil chamber passes through and is slidably connected with a lifting column, the bottom of the piston ring is fixedly connected to the top of the lifting column, the communicating path is opened in the interior of the drill bit body, the tooth palm is fixedly connected to the top of the drill bit body, an adjusting path is opened in the tooth palm, the internal piston of the adjusting path is slidably connected with the piston rod, a sliding groove is opened on the side of the adjusting path, and a connecting column is slidably connected inside the sliding groove, one end of the connecting column is fixedly connected to the piston rod, and a roller drill mechanism is provided on the other end of the connecting column, and an anti-blocking heat dissipation mechanism is provided on the side of the warehouse body.

[0007] According to the above technical solution, the bottom of the piston ring is fixedly connected to the top of the lifting column, one end of the connecting column is fixedly connected to the piston rod, and the other end of the connecting column is provided with a roller drill mechanism. The lifting column is threadedly connected to the threaded rod through a built-in thread, and the top of the oil chamber is tightly fitted with the bottom of the drill body. When the threaded rod rotates, it will drive the lifting column to rise or fall, and the oil chamber as a whole will remain sealed when the drill body rotates.

[0008] According to the above technical solution, one end of the communication path is connected to the oil chamber, and the other end of the communication path is connected to the regulating path. The hydraulic oil in the oil chamber can move through the communication path and the regulating path.

[0009] According to the above technical solution, the roller drill bit mechanism includes a lifting seat and a stud, the bottom of the lifting seat is fixedly connected to the end of the connecting column away from the piston rod, the bottom of the lifting seat is slidably connected to the tooth palm, the top of the lifting seat is provided with a slot, the interior of the slot is plugged with a plug, the inner wall of the slot is provided with a groove, a telescopic spring is provided inside the groove, the interior of the groove is elastically connected with a positioning arc block through the telescopic spring, the positioning arc block is fixedly connected with a pull rod at one end close to the telescopic spring, the pull rod passes through and is slidably connected to the lifting seat, a slot is provided on the surface of the plug, the top of the slot is fixedly connected to the roller drill bit body, the stud passes through the roller drill bit body, and one end of the stud passing through the roller drill bit body also passes through the lifting seat, and a closing component is provided on the top of the roller drill bit body.

[0010] According to the above technical solution, the closing component includes an open groove, an entry groove is provided on the inner wall of the open groove, a spring telescopic rod is provided inside the entry groove, the telescopic end of the spring telescopic rod is fixedly connected to the closing plate, and the top of the closing plate is fixedly connected to a shift block.

[0011] According to the above technical solution, PDC cutting teeth are provided on the surface of the cone drill bit body and the blade. In the initial state, half of the positioning arc block is located in the slot. The positioning arc block is stuck in the slot so that the column cannot leave the slot and cannot rotate.

[0012] According to the above technical solution, the arc surface of the positioning arc block faces the top of the plug column, the depth of the groove is greater than the length of the positioning arc block, the size of the closing plate corresponds to the size of the opening groove, and the depth of the entry groove is greater than the length of the closing plate. When the arc surface of the positioning arc block is squeezed, it will shrink into the groove. The closing plate can prevent debris from getting stuck in the top of the stud, and the closing plate can be completely retracted into the entry groove.

[0013] According to the above technical solution, the anti-clogging heat dissipation mechanism includes a ventilation groove, an air pressure chamber and an eccentric extrusion ring. The ventilation groove is opened on the side of the chamber body, and a filter is provided inside the ventilation groove. The air pressure chamber passes through and is fixedly connected to the surface of the mounting column. An air bag is provided at one end of the air pressure chamber, and a push rod is slidably connected to the internal piston at the other end of the air pressure chamber. The end of the push rod away from the air pressure chamber is fixedly connected to the brush head, and the eccentric extrusion ring is fixedly connected to the surface of the threaded rod.

[0014] According to the above technical solution, the airbag is in an expanded state in the initial state, and the end of the airbag away from the air pressure chamber is close to the eccentric extrusion ring. When the eccentric extrusion ring rotates with the threaded rod, it will repeatedly squeeze the airbag. The air bag is squeezed and the air pressure inside it will enter the air pressure chamber, thereby pushing the push rod to move upward.

[0015] According to the above technical solution, the air pressure chamber is L-shaped as a whole, and the bristles of the brush head are in contact with the surface of the filter in the initial state. When the push rod drives the brush head to move upward, the bristles of the brush head will clean the surface of the filter.

[0016] The present invention provides a PDC drill bit that can adapt to geological conditions and has the following beneficial effects:

[0017] (1) The present invention adapts to the setting of the adjustment mechanism, so that when the drill bit body is used for drilling, the micro motor can be turned on to drive the threaded rod to rotate according to the different geological conditions. At this time, the height of the roller drill bit body can be adjusted through the cooperation of the lifting column, piston ring, oil chamber, piston rod and other components to adapt to the drilling work in different geological conditions. After the adjustment, the position of the roller drill bit body will be fixed, and the drilling efficiency will not be affected by the pressure retreat.

[0018] (2) The present invention provides a roller drill mechanism so that when the roller drill body is installed, the roller drill body can be initially positioned by means of the positioning arc block, the slot and other components, and then the roller drill body can be fastened by tightening the stud. When the upper portion of the roller drill body is severely worn, the stud can be loosened and removed, and then the pull rod can be pulled to make the positioning arc block leave the slot. At this time, the roller drill body can be rotated to use the less worn portion, and the design of the closed component prevents debris from clogging the top of the stud.

[0019] (3) The present invention provides an anti-clogging heat dissipation mechanism, so that the micro motor can be ventilated and dissipated through the ventilation slot, and the filter can prevent the entry of debris. At the same time, when the micro motor drives the threaded rod to rotate, the air bag, air pressure chamber and other components will cooperate to drive the brush head to move up and down repeatedly to clean the filter surface, thereby preventing the filter from being blocked and affecting ventilation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0021] Figure 2 A three-dimensional cross-sectional view of the overall structure of the present invention;

[0022] Figure 3 A three-dimensional cross-sectional view of the structure of the adaptive adjustment mechanism and the anti-blocking heat dissipation mechanism of the present invention;

[0023] Figure 4 For the present invention Figure 3 A magnified view of the structure at center A;

[0024] Figure 5 For the present invention Figure 3 A magnified view of the structure at B in the middle;

[0025] Figure 6 A three-dimensional cross-sectional view of the structure of the roller drill bit of the present invention;

[0026] Figure 7 For the present invention Figure 6 A magnified view of the structure at center C;

[0027] Figure 8 A three-dimensional cross-sectional view of the closed assembly structure of the present invention;

[0028] Figure 9 For the present invention Figure 8 A magnified view of the structure at position D in the middle.

[0029] Figure: 1, threaded mounting block; 2, mounting column; 3, drill body; 4, blade; 5, adaptive adjustment mechanism; 51, housing; 52, micro motor; 53, threaded rod; 54, oil chamber; 55, piston ring; 56, lifting column; 57, adjustment path; 58, piston rod; 59, slide; 510, connecting column; 511, tooth palm; 512, connecting path; 6, roller drill mechanism; 61, lifting seat; 62, slot; 63, plug column; 64, recess Groove; 65, telescopic spring; 66, positioning arc block; 67, pull rod; 68, slot; 69, roller drill bit body; 610, stud; 7, closing assembly; 71, opening slot; 72, entry slot; 73, spring telescopic rod; 74, closing plate; 75, shift block; 8, anti-blocking heat dissipation mechanism; 81, ventilation slot; 82, filter screen; 83, air pressure chamber; 84, air bag; 85, push rod; 86, brush head; 87, eccentric extrusion ring; 9, output shaft slot. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] See also Figures 1-9, one embodiment of the present invention is: a PDC drill bit that can adapt to geological conditions, including a threaded mounting block 1, the top of the threaded mounting block 1 is fixedly connected to a mounting column 2, the top of the mounting column 2 is rotatably connected to a drill bit body 3, the top of the drill bit body 3 is fixedly connected to a blade 4, the bottom of the drill bit body 3 is provided with an output shaft groove 9, and the top of the drill bit body 3 is provided with an adaptive adjustment mechanism 5; the adaptive adjustment mechanism 5 includes a bin 51, an oil chamber 54, a communication path 512 and a tooth palm 511, the bin 51 is opened inside the mounting column 2, the oil chamber 54 is opened at the top of the drill bit body 3, a micro motor 52 is provided inside the bin 51, the output shaft of the micro motor 52 is fixedly connected to a threaded rod 53, the internal piston of the oil chamber 54 is slidably connected to a piston ring 55, and the oil chamber 5 4 is penetrated and slidably connected with a lifting column 56, which is threadedly connected to the threaded rod 53 through an internal thread, and the top of the oil chamber 54 is tightly fitted with the bottom of the drill body 3. When the threaded rod 53 rotates, it will drive the lifting column 56 to rise or fall. When the drill body 3 rotates, the oil chamber 54 as a whole will remain sealed. The bottom of the piston ring 55 is fixedly connected to the top of the lifting column 56. The communication path 512 is opened in the interior of the drill body 3, and the tooth palm 511 is fixedly connected to the top of the drill body 3. An adjustment path 57 is opened in the tooth palm 511. One end of the communication path 512 is connected to the oil chamber 54, and the other end of the communication path 512 is connected to the adjustment path 57. The hydraulic oil in the oil chamber 54 can move through the communication path 512 and the adjustment path 57 to adjust The internal piston of the road 57 is slidably connected with the piston rod 58, and a slide groove 59 is provided on the side of the adjustment road 57. The internal sliding connection of the slide groove 59 is provided with a connecting column 510. One end of the connecting column 510 is fixedly connected to the piston rod 58, and the other end of the connecting column 510 is provided with a roller drill mechanism 6. The roller drill mechanism 6 includes a lifting seat 61 and a stud 610. The bottom of the lifting seat 61 is fixedly connected to the end of the connecting column 510 away from the piston rod 58. The bottom of the lifting seat 61 is slidably connected to the tooth palm 511. A slot 62 is provided on the top of the lifting seat 61. A plug 63 is inserted into the inside of the slot 62. A groove 64 is provided on the inner wall of the slot 62. A telescopic spring 65 is provided inside the groove 64. The inside of the groove 64 is elastically connected to a positioning The arc block 66 is fixedly connected to one end of the positioning arc block 66 near the telescopic spring 65 with a pull rod 67, which penetrates and is slidably connected to the lifting seat 61. A slot 68 is provided on the surface of the plug post 63, and the top of the slot 62 is fixedly connected to the roller drill body 69. The stud 610 penetrates the roller drill body 69, and one end of the stud 610 penetrates the roller drill body 69 and also penetrates the lifting seat 61. The surfaces of the roller drill body 69 and the blade 4 are both provided with PDC cutting teeth. In the initial state, one-half of the positioning arc block 66 is located in the slot 68. The positioning arc block 66 is stuck in the slot 68 so that the plug post 63 cannot leave the slot 62 and cannot rotate. A closing component 7 is provided on the top of the roller drill body 69. The closing component 7 includes an opening slot 71.An entry slot 72 is formed on the inner wall of the opening slot 71. A spring-loaded telescopic rod 73 is provided inside the entry slot 72. A closing plate 74 is fixedly connected to the telescopic end of the spring-loaded telescopic rod 73. A shift block 75 is fixedly connected to the top of the closing plate 74. The arc surface of the positioning arc block 66 faces the top of the plug post 63. The depth of the groove 64 is greater than the length of the positioning arc block 66. The size of the closing plate 74 corresponds to the size of the opening slot 71. The depth of the entry slot 72 is greater than the length of the closing plate 74. When the arc surface of the positioning arc block 66 is squeezed, it will retract into the groove 64. The closing plate 74 can prevent debris from getting stuck in the top of the stud 610. The closing plate 74 can be completely retracted into the entry slot 72. An anti-blocking heat dissipation mechanism 8 is provided on the side of the bin body 51.

[0032] When in use, the mounting column 2 is fixed to the machine body through the threaded mounting block 1, and the output shaft of the machine body is inserted into the output shaft groove 9. The drill bit body 3 is driven to rotate by the cooperation between the output shaft and the output shaft groove 9, while the mounting column 2 does not rotate. When encountering different geological conditions, the micro motor 52 can be turned on to drive the threaded rod 53 to rotate. When the threaded rod 53 rotates, it drives the lifting column 56 to rise or fall. When the lifting column 56 descends, negative pressure is formed in the oil chamber 54, thereby causing the piston rod 58 to move downward along the adjustment path 57 through the hydraulic oil. The downward movement of the piston rod 58 will drive the lifting seat 61 to move downward through the connecting column 510. The downward movement of the lifting seat 61 will drive the roller drill bit body 69 to move downward. When the lifting column 56 moves upward, the hydraulic oil will drive the piston rod 58 to move upward. The upward movement of the piston rod 58 will drive the lifting seat 61 to move upward through the connecting column 510, and the roller drill bit body 69 will move upward accordingly. The roller drill bit body 69 can be adjusted to adapt to different geological conditions. During the drilling work, when installing the roller drill bit body 69, the bottom plug 63 of the roller drill bit body 69 is inserted into the top slot 62 of the lifting seat 61 and the roller drill bit body 69 is rotated so that the groove 64 coincides with the card slot 68. At the beginning, the arc surface of the positioning arc block 66 is squeezed and retracted into the groove 64, and the telescopic spring 65 is compressed. When the groove 64 coincides with the card slot 68, the telescopic spring 65 rebounds and drives the positioning arc block 66 to be initially positioned in the card slot 68, and then the roller drill bit body 69 is rotated so that the groove 64 coincides with the card slot 68. Insert the stud 610 for tightening. When the part of the roller drill body 69 near the top is severely worn, the stud 610 can be loosened and removed, and then the pull rod 67 is pulled to make the positioning arc block 66 leave the slot 68. At this time, the roller drill body 69 can be rotated to use the part with less wear. The closing plate 74 can prevent debris from getting stuck in the top of the stud 610. The closing plate 74 can be driven to be completely retracted into the slot 72 by the shift block 75, and the spring telescopic rod 73 can mobilize the closing plate 74 to pop out and restore.

[0033] See also Figures 1-9On the basis of the above embodiment, in another embodiment of the present invention, the anti-clogging heat dissipation mechanism 8 includes a ventilation groove 81, an air pressure chamber 83 and an eccentric extrusion ring 87. The ventilation groove 81 is opened on the side of the chamber body 51, and a filter 82 is provided inside the ventilation groove 81. The air pressure chamber 83 passes through and is fixedly connected to the surface of the mounting column 2. An air bag 84 is provided at one end of the air pressure chamber 83. A push rod 85 is slidably connected to the piston inside the other end of the air pressure chamber 83. The end of the push rod 85 away from the air pressure chamber 83 is fixedly connected to the brush head 86. The eccentric extrusion ring 87 is fixedly connected to the On the surface of the threaded rod 53, the airbag 84 is in an expanded state in the initial state, and the end of the airbag 84 away from the air pressure chamber 83 is close to the eccentric extrusion ring 87. When the eccentric extrusion ring 87 rotates with the threaded rod 53, it will repeatedly squeeze the airbag 84. The air pressure inside the airbag 84 will enter the air pressure chamber 83, thereby pushing the push rod 85 to move upward. The air pressure chamber 83 is L-shaped as a whole. The bristles of the brush head 86 are in contact with the surface of the filter 82 in the initial state. When the push rod 85 drives the brush head 86 to move upward, the bristles of the brush head 86 will clean the surface of the filter 82.

[0034] During use, the micro motor 52 can be ventilated and cooled through the ventilation slot 81, and the filter 82 can prevent the entry of debris. When the micro motor 52 drives the threaded rod 53 to rotate for adjustment, the eccentric extrusion ring 87 will repeatedly squeeze the air bag 84 as it follows the rotation of the threaded rod 53. The air pressure inside the air bag 84 will enter the air pressure chamber 83, thereby pushing the push rod 85 to move upward. The upward movement of the push rod 85 will drive the brush head 86 to move upward. When the eccentric extrusion ring 87 leaves the air bag 84, the air bag 84 rebounds, and the air pressure in the air pressure chamber 83 returns to the air bag 84. At this time, the push rod 85 drives the brush head 86 to move downward and restore. The brush head 86 repeatedly moves up and down to clean the surface of the filter 82, preventing the filter 82 from being blocked and affecting ventilation and heat dissipation.

[0035] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A PDC drill bit adaptable to geological conditions, comprising a threaded mounting block (1), characterized in that: The top of the threaded mounting block (1) is fixedly connected to a mounting column (2), the top of the mounting column (2) is rotatably connected to a drill body (3), the top of the drill body (3) is fixedly connected to a blade (4), the bottom of the drill body (3) is provided with an output shaft groove (9), and the top of the drill body (3) is provided with an adaptive adjustment mechanism (5); The adaptive adjustment mechanism (5) includes a housing (51), an oil chamber (54), a communication path (512) and a tooth palm (511), wherein the housing (51) is opened inside the mounting column (2), the oil chamber (54) is opened on the top of the drill bit body (3), a micro motor (52) is arranged inside the housing (51), the output shaft of the micro motor (52) is fixedly connected to a threaded rod (53), the internal piston of the oil chamber (54) is slidably connected to a piston ring (55), and the interior of the oil chamber (54) is penetrated and slidably connected to the piston ring (55). A lifting column (56) is connected, the communication path (512) is opened inside the drill body (3), the tooth palm (511) is fixedly connected to the top of the drill body (3), an adjustment path (57) is opened inside the tooth palm (511), the internal piston of the adjustment path (57) is slidably connected to the piston rod (58), a sliding groove (59) is opened on the side of the adjustment path (57), the interior of the sliding groove (59) is slidably connected to the connecting column (510), and an anti-blocking heat dissipation mechanism (8) is provided on the side of the storage body (51); The bottom of the piston ring (55) is fixedly connected to the top of the lifting column (56), one end of the connecting column (510) is fixedly connected to the piston rod (58), the other end of the connecting column (510) is provided with a cone drill mechanism (6), the lifting column (56) is threadedly connected to the threaded rod (53) via an internal thread, and the top of the oil chamber (54) is tightly fitted with the bottom of the drill body (3); One end of the communication passage (512) is connected to the oil chamber (54), and the other end of the communication passage (512) is connected to the regulating passage (57); The roller bit mechanism (6) includes a lifting seat (61) and a stud (610), the bottom of the lifting seat (61) is fixedly connected to the end of the connecting column (510) away from the piston rod (58), the bottom of the lifting seat (61) is slidably connected to the tooth palm (511), the top of the lifting seat (61) is provided with a slot (62), the interior of the slot (62) is plugged with a stud (63), the inner wall of the slot (62) is provided with a groove (64), the interior of the groove (64) is provided with a telescopic spring (65), and the interior of the groove (64) is elastically connected to the connecting column (510) by the telescopic spring (65). A positioning arc block (66) is connected, and one end of the positioning arc block (66) close to the telescopic spring (65) is fixedly connected to a pull rod (67), and the pull rod (67) passes through and is slidably connected to the lifting seat (61). A slot (68) is provided on the surface of the plug column (63), and the top of the slot (62) is fixedly connected to the roller drill body (69), and the stud (610) passes through the roller drill body (69), and one end of the stud (610) passing through the roller drill body (69) also passes through the lifting seat (61), and a closing component (7) is provided on the top of the roller drill body (69).

2. The geologically adaptable PDC drill bit according to claim 1, characterized in that: The closing assembly (7) comprises an opening slot (71), an entry slot (72) is provided on the inner wall of the opening slot (71), a spring telescopic rod (73) is provided inside the entry slot (72), a telescopic end of the spring telescopic rod (73) is fixedly connected to a closing plate (74), and a shift block (75) is fixedly connected to the top of the closing plate (74).

3. The geologically adaptable PDC drill bit according to claim 2, characterized in that: The surfaces of the roller bit body (69) and the blade (4) are both provided with PDC cutting teeth, and in the initial state, one-half of the positioning arc block (66) is located in the clamping groove (68).

4. The geologically adaptable PDC drill bit according to claim 3, characterized in that: The arc surface of the positioning arc block (66) faces the top of the plug post (63), the depth of the groove (64) is greater than the length of the positioning arc block (66), the size of the closing plate (74) corresponds to the size of the opening groove (71), and the depth of the entry groove (72) is greater than the length of the closing plate (74).

5. The geologically adaptable PDC drill bit according to claim 4, characterized in that: The anti-clogging heat dissipation mechanism (8) comprises a ventilation groove (81), an air pressure chamber (83) and an eccentric extrusion ring (87), wherein the ventilation groove (81) is provided on the side of the chamber body (51), a filter screen (82) is provided inside the ventilation groove (81), the air pressure chamber (83) passes through and is fixedly connected to the surface of the mounting column (2), an air bag (84) is provided at one end of the air pressure chamber (83), a push rod (85) is slidably connected to the internal piston of the other end of the air pressure chamber (83), and a brush head (86) is fixedly connected to the end of the push rod (85) away from the air pressure chamber (83), and the eccentric extrusion ring (87) is fixedly connected to the surface of the threaded rod (53).

6. The geologically adaptable PDC drill bit according to claim 5, characterized in that: The airbag (84) is in an expanded state in an initial state, and one end of the airbag (84) away from the air pressure chamber (83) is close to the eccentric extrusion ring (87).

7. The geologically adaptable PDC drill bit according to claim 6, characterized in that: The air pressure chamber (83) is L-shaped as a whole, and the bristles of the brush head (86) are in contact with the surface of the filter (82) in the initial state.

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