Petroleum drilling bit apparatus

Abstract

The present application relates to the technical field of oil drilling bit, especially relates to an oil drilling bit device, aiming at solving the technical problems that the existing drilling bit cannot be considered in the aspects of application range, maintenance cost and tunneling speed. The oil drilling bit device comprises a drilling bit telescopic assembly, a pdc drilling bit and a roller bit; the drilling bit telescopic assembly comprises a fixed base, a first circular ring, a moving base, a telescopic mechanism and a connecting rod mechanism; the pdc drilling bit is arranged in the moving base; the roller bit can be telescoped along its own axis and is provided with a plurality of roller bits; the plurality of roller bits are arranged on the moving base at intervals around the axis of the pdc drilling bit. Through the cooperation of the telescopic mechanism and the connecting rod mechanism, the switching tunneling of the two kinds of oil drilling bits can be realized, so that the oil drilling bit device can be suitable for more terrains.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil drilling bits, in particular to an oil drilling bit device. BACKGROUND

[0002] The oil drilling bit is an important tool for oil drilling, and its working performance will directly affect the drilling quality, drilling efficiency and drilling cost. At present, the oil drilling bit is mainly divided into two types: roller bit and pdc bit. The roller bit is suitable for a variety of rock layers, but its excavation speed is slow, the blade life is short, and it needs to be replaced frequently, and the maintenance cost is high. The pdc bit has high excavation speed and low maintenance cost, but it is suitable for a small number of rock layers. Therefore, it is necessary to develop a bit that is suitable for a variety of rock layers, has low maintenance cost and high excavation speed. SUMMARY

[0003] The present application relates to the technical field of oil drilling bits, in particular to an oil drilling bit device.

[0004] In order to solve the above technical problems, the technical scheme provided by the present application is as follows:

[0005] The oil drilling bit device provided by the present application comprises a bit telescopic assembly, a pdc bit and a roller bit. The bit telescopic assembly comprises a fixed base, a first circular ring, a moving base, a telescopic mechanism and a connecting rod mechanism.

[0006] The fixed base has a first annular cavity and a first hole, the first annular cavity extends along the circumference of the first hole, and a first channel hole is arranged on the side wall between the first hole and the first annular cavity.

[0007] The first circular ring is inserted and matched with the fixed base through the first hole, and a first flow guide hole is arranged on the side wall of the first circular ring opposite to the first channel hole.

[0008] The moving base is inserted and matched with the fixed base through the first hole, and is connected with the first circular ring through a connecting line.

[0009] The telescopic mechanism is connected between the fixed base and the moving base, and is arranged in communication with the first annular cavity. The telescopic mechanism is configured to drive the moving base to make a first linear motion away from the fixed base under a pressurized working condition, and to make a second linear motion towards the fixed base under a pressureless working condition.

[0010] The pdc bit is arranged in the moving base.

[0011] The roller bit can be telescopic along its own axis, and a plurality of the roller bits are arranged around the axis of the PDC bit on the moving base;

[0012] The connecting rod mechanism corresponds to the roller bit one by one and is connected with the roller bit, the PDC bit, the moving base and the fixed base respectively. The connecting rod mechanism can drive the roller bit to turn outward to expand and drive the PDC bit to slide to extend the roller bit in the first linear motion of the moving base, and can drive the roller bit to turn inward to contract and drive the PDC bit to slide to retract the roller bit in the second linear motion of the moving base.

[0013] Further, the telescopic mechanism includes a piston rod, a pressure cylinder and a tension spring;

[0014] The piston rod is fixedly connected with the moving base;

[0015] The pressure cylinder is sleeved on the piston rod and fixedly connected with the fixed base and in communication with the first annular cavity;

[0016] The tension spring is sleeved on the pressure cylinder and connected between the fixed base and the moving base, and the tension spring makes the moving base have a tendency of the second linear motion.

[0017] Further, the moving base has a second annular cavity and a second hole, the second annular cavity extends along the circumference of the second hole, and the second hole is used for penetrating the PDC bit and in communication with the first hole;

[0018] The drill bit telescopic assembly further includes a water washing mechanism, and the water washing mechanism includes a touch rod, a bellows, a first one-way valve and a spray pipe;

[0019] The touch rod is fixedly connected with the moving base;

[0020] The bellows is sleeved on the touch rod and fixedly connected between the moving base and the fixed base, and two ends of the bellows are respectively in communication with the first annular cavity and the second annular cavity;

[0021] The first one-way valve is arranged in the bellows and between the touch rod and the fixed base;

[0022] The spray pipe is fixedly connected with the moving base and in communication with the second annular cavity.

[0023] Further, the connecting rod mechanism includes a roller fixing seat, a connecting rod, a guide column and a crowbar;

[0024] The roller fixing base is fixedly connected to the movement base, and the roller bit is hingedly connected to the roller fixing base;

[0025] One end of the connecting rod is hingedly connected to the roller bit, and the other end is hingedly connected to the fixed base;

[0026] The guide column is rotationally matched with the roller fixing base;

[0027] One end of the crowbar is hingedly connected to the connecting rod, and the other end extends to pass through the guide column in a direction perpendicular to the rotation axis of the guide column and is inserted into the PDC bit.

[0028] Further, the roller bit comprises a linear driver, a first roller and a plurality of second rollers;

[0029] In the driving direction of the linear driver, the first roller and the plurality of second rollers are sequentially distributed;

[0030] The first roller is slidingly connected with the second roller, and adjacent layers of the second rollers are also slidingly connected;

[0031] The body of the linear driver is arranged on the second roller away from the first roller, and the driving end is fixedly connected with the first roller.

[0032] Further, the first roller comprises a first protrusion, a first base, a first motor, a rotating wheel and a movement ring arranged on the first base;

[0033] Along the circumference of the first base, a plurality of first protrusions are arranged on the side wall of the first base in a spaced manner and are hingedly connected with the first base, and the mining end of the first protrusion is outside the first base;

[0034] The first motor is in transmission connection with the rotating wheel;

[0035] Along the circumference of the rotating wheel, the side surface of the rotating wheel is provided with a wavy sliding groove;

[0036] The movement ring is sleeved on the rotating wheel, the inner wall of the movement ring is provided with a protrusion for matching the sliding groove, and the outer wall of the movement ring is provided with a limiting groove extending along the circumference of the outer wall for accommodating one end of the first protrusion away from the mining end.

[0037] Further, the second roller comprises a second protrusion, a second base, a compression spring, a second motor and a rotating disc arranged on the second base;

[0038] The second protrusion is arranged through the side wall of the second base, and a plurality of second protrusions are arranged in a spaced manner along the circumference of the second base;

[0039] The compression spring is in one-to-one correspondence with the second protrusion and is connected between the second protrusion and the second base, and the compression spring makes the second protrusion have a tendency to move towards the inside of the second base.

[0040] The second motor is in transmission connection with the rotating disc.

[0041] The side wall of the rotating disc is matched with the second protrusion through a first inclined wedge structure.

[0042] Further, the pdc drill bit comprises a drill bit body, a third protrusion, an elastic member and a reset rod.

[0043] One end surface of the drill bit body is provided with a guide rail groove, and the guide rail groove extends between the axis and the side surface of the drill bit body along the radial direction of the drill bit body.

[0044] The third protrusion is embedded in the guide rail groove and can slide along the extension direction of the guide rail groove.

[0045] The elastic member is arranged in the guide rail groove and is connected with the drill bit body and the third protrusion respectively, and the elastic member makes the third protrusion have a tendency to slide away from the axis of the drill bit body.

[0046] The reset rod is fixedly connected to the moving base, and one end of the reset rod away from the moving base is matched with the third protrusion through a second inclined wedge structure.

[0047] Further, the petroleum drilling drill bit device further comprises an anti-sticking force adding assembly.

[0048] The anti-sticking force adding assembly comprises a force adding base, a guide pipe, a second circular ring, a drill rod connecting cylinder and a force adding mechanism.

[0049] One end of the force adding base is fixedly connected with the fixed base, and the other end is rotatably connected with the drill rod connecting cylinder, the force adding base has a third hole, the third hole is in communication with the first hole and the drill rod connecting cylinder respectively, and the side wall of the drill rod body is provided with a second channel hole.

[0050] One end of the guide pipe is in communication with the second channel hole, and the other end extends to the force adding mechanism and is in communication with the force adding mechanism.

[0051] The second circular ring is rotatably matched with the force adding base and is located between the second channel hole and the guide pipe to block the communication between the second channel hole and the guide pipe, and the side wall of the second circular ring is provided with a second flow guide hole, and the second flow guide hole is distributed in a staggered manner with the second channel hole in the initial state.

[0052] The drill pipe connecting barrel is connected with the second circular ring, and a first spring is arranged between the drill pipe connecting barrel and the force adding base, so that the force adding base has a tendency to rotate synchronously with the drill pipe connecting barrel;

[0053] The force adding mechanism is arranged on the force adding base and is configured to impact the force adding base to make the force adding base have a tendency to rotate around the axis of the drill pipe connecting barrel in a pressurized working condition.

[0054] Further, the force adding mechanism comprises a knocking block and a driving assembly;

[0055] The inner wall of the force adding base is provided with the knocking block;

[0056] The knocking block is rotationally matched with the force adding base, and a second spring is arranged between the knocking block and the force adding base, so that the knocking block has a tendency to rotate to impact the knocking block in a deformed working condition.

[0057] The driving assembly is transmissionally connected with the knocking block through an incomplete gear structure to drive the knocking block to rotate, so as to deform the second spring.

[0058] The technical effects achieved by the petroleum drilling bit device provided by the present application are as follows:

[0059] In the petroleum drilling bit device, when the drilling fluid flows through the first hole, part of the drilling fluid enters the first annular cavity through the first channel hole and the first guide hole, so that the telescopic mechanism is pressurized, and then the telescopic mechanism drives the moving base to move linearly away from the fixed base, and under the transmission of the connecting rod mechanism, the multiple roller bits are turned outward, and the pdc bit is slidably extended; when the bit device is excavated, the roller bit is started to increase the mining efficiency, and when the roller bit is about to be leveled, the roller bit is retracted, so that the bit switching is completed, and the pdc bit is used for mining.

[0060] As described above, when the pdc bit is slidably extended, the moving base pulls the first circular ring to make the first guide hole of the first circular ring and the first channel hole of the fixed base be dislocated, so as to block the communication between the first hole and the first annular cavity, and at this time, the drilling fluid in the first annular cavity loses pressure, so that the telescopic mechanism is in a pressure loss state; after the telescopic mechanism loses pressure, the moving base is reset, i.e., moves linearly to the fixed base, and in the process of returning to the original position, the roller bit is retracted under the linkage of the connecting rod mechanism, and the pdc bit is slidably retracted, so that the bit switching is completed, and a telescopic and bit switching process is completed, and it should be noted that the pdc bit impacts the first circular ring to make the first circular ring return to the original position.

[0061] Compared with the prior art, the oil drilling bit device can realize the switching and excavation of two oil drilling bits, so that it can be suitable for more terrains, the service life of the drilling bit is improved, the drilling bit does not need to be replaced frequently, and the maintenance cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0063] Figure 1 The structural schematic diagram of the oil drilling bit device provided by the embodiment of the present application is shown in the figure.

[0064] Figure 2 The sectional view of the oil drilling bit device provided by the embodiment of the present application is shown in the figure.

[0065] Figure 3 The structural schematic diagram of the oil drilling bit device provided by the embodiment of the present application is shown in the figure.

[0066] Figure 4 The structural schematic diagram of the drilling bit telescopic assembly and the oil drilling bit assembly provided by the embodiment of the present application is shown in the figure.

[0067] Figure 5 The structural schematic diagram of the drilling bit telescopic assembly provided by the embodiment of the present application is shown in the figure.

[0068] Figure 6 The distribution diagram of the roller bit provided by the embodiment of the present application is shown in the figure.

[0069] Figure 7 The structural schematic diagram of the fixed base provided by the embodiment of the present application is shown in the figure.

[0070] Figure 8 The sectional view of the fixed base provided by the embodiment of the present application is shown in the figure.

[0071] Figure 9 The structural schematic diagram of the first circular ring provided by the embodiment of the present application is shown in the figure.

[0072] Figure 10 The structural schematic diagram of the movable base provided by the embodiment of the present application is shown in the figure.

[0073] Figure 11 The structural schematic diagram of the roller bit provided by the embodiment of the present application is shown in the figure.

[0074] Figure 12A cross-sectional view of the roller bit provided by the embodiment of the present application;

[0075] Figure 13 An exploded view of the roller bit provided by the embodiment of the present application;

[0076] Figure 14 An exploded view of the first roller provided by the embodiment of the present application;

[0077] Figure 15 An exploded view of the second roller provided by the embodiment of the present application;

[0078] Figure 16 A structural schematic view of the PDC bit provided by the embodiment of the present application;

[0079] Figure 17 An exploded view of the PDC bit provided by the embodiment of the present application;

[0080] Figure 18 A structural schematic view of the anti-sticking force adding assembly provided by the embodiment of the present application;

[0081] Figure 19 A connection schematic view of the force adding base and the transmission seat provided by the embodiment of the present application;

[0082] Figure 20 A structural schematic view of the knocking block provided by the embodiment of the present application;

[0083] Figure 21 A structural schematic view of the partial force adding base provided by the embodiment of the present application;

[0084] Figure 22 A partial cross-sectional view of the Figure 21 ;

[0085] Figure 23 A structural schematic view of the second circular ring provided by the embodiment of the present application;

[0086] Figure 24 A structural schematic view of the transmission seat provided by the embodiment of the present application;

[0087] Figure 25 A structural schematic view of the driving assembly provided by the embodiment of the present application;

[0088] Figure 26 A structural schematic view of the impeller provided by the embodiment of the present application.

[0089] Icon: 1-pdc bit; 1.1-bit body; 1.2-third protruding block; 1.3-elastic member; 1.1.1-guide rail groove;

[0090] 2-bit; 2.1-linear driver; 2.2-first roller; 2.3-second roller; 2.2.1-first protrusion; 2.2.2-first base; 2.2.3-first motor; 2.2.4-rotary wheel; 2.2.5-moving ring; 2.2.6-first end cover; 2.3.1-second protrusion; 2.3.2-second base; 2.3.3-pressing spring; 2.3.4-second motor; 2.3.5-rotary disc; 2.3.6-second end cover;

[0091] 3-fixed base; 3.1-first annular cavity; 3.2-first hole channel; 3.3-first duct hole;

[0092] 4-first circular ring; 4.1-first flow guide hole;

[0093] 5-moving base; 5.1-second annular cavity;

[0094] 6-piston rod; 7-pressure cylinder; 8-tension spring; 9-touch rod; 10-bellow; 11-first one-way valve; 12-nozzle; 13-roller fixing base; 14-connecting rod; 15-guide column; 16-prying rod; 17-resetting rod;

[0095] 18-force adding base; 18.1-second duct hole; 18.2-impact block; 18.3-flow-through hole;

[0096] 19-catheter;

[0097] 20-second circular ring; 20.1-second flow guide hole;

[0098] 21-drill rod connecting cylinder; 22-first spring; 23-knocking block;

[0099] 24-driving assembly; 24.1-impeller;

[0100] 25-second spring; 26-transmission base. DETAILED DESCRIPTION

[0101] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0102] The following detailed description of embodiments of the application in the drawings is not intended to limit the scope of the application as claimed, but merely represents selected embodiments of the application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the application without creative work are within the scope of protection of the application.

[0103] Some embodiments of the application will be described in detail with reference to the drawings. The following embodiments and features of the embodiments can be combined with each other in the case of no conflict.

[0104] The oil drill bit is an important tool for oil drilling, which is used to make a well for oil exploitation. The performance of the oil drill bit will directly affect the drilling quality, drilling efficiency and drilling cost. At present, the oil drill bit mainly includes two types: a roller bit and a pdc bit. The roller bit is suitable for a variety of rock layers, but its excavation speed is slow, the blade life is short, and it needs to be replaced frequently, resulting in high maintenance cost. The pdc bit has high excavation speed and low maintenance cost, but it is suitable for a small variety of rock layers. Therefore, it is necessary to develop a drill bit which is suitable for a variety of rock layers, has low maintenance cost and high excavation speed.

[0105] The petroleum drilling bit device comprises a bit telescopic assembly, a pdc bit 1 and a roller bit 2; the bit telescopic assembly comprises a fixed base 3, a first ring 4, a moving base 5, a telescopic mechanism and a connecting rod mechanism; the fixed base 3 is provided with a first annular cavity 3.1 and a first hole 3.2, the first annular cavity 3.1 extends along the circumference of the first hole 3.2, and a first channel hole 3.3 is arranged on the side wall between the first hole 3.2 and the first annular cavity 3.1; the first ring 4 is inserted and matched with the fixed base 3 through the first hole 3.2, and the side wall of the first ring 4 is provided with a first flow guide hole 4.1 opposite to the first channel hole 3.3; the moving base 5 is inserted and matched with the fixed base 3 through the first hole 3.2, and is connected with the first ring 4 through a connecting line; the telescopic mechanism is connected between the fixed base 3 and the moving base 5, and is arranged in communication with the first annular cavity 3.1; the telescopic mechanism is configured to drive the moving base 5 to move in a first straight line direction away from the fixed base 3 under a pressurized working condition, and to drive the moving base 5 to move in a second straight line direction close to the fixed base 3 under a pressureless working condition; the pdc bit 1 is arranged in the moving base 5; the roller bit 2 is telescopic along its own axis, and a plurality of roller bits 2 are arranged on the moving base 5 at intervals around the axis of the pdc bit 1; the connecting rod mechanism corresponds to the roller bit 2 one by one, and is connected with the roller bit 2, the pdc bit 1, the moving base 5 and the fixed base 3 respectively; the connecting rod mechanism can drive the roller bit 2 to turn over to open outward, and drive the pdc bit 1 to slide to extend the roller bit 2 under the working condition that the moving base 5 moves in the first straight line, and can drive the roller bit 2 to turn over to shrink inward, and drive the pdc bit 1 to slide to retract the roller bit 2 under the working condition that the moving base 5 moves in the second straight line.

[0106] In the petroleum drilling bit device, when the drilling fluid flows through the first hole 3.2, part of the drilling fluid will enter the first annular cavity 3.1 through the first channel hole 3.3 and the first flow guide hole 4.1, so as to pressurize the telescopic mechanism, and then the telescopic mechanism will drive the moving base 5 to move in a first straight line direction away from the fixed base 3, and at the same time, under the transmission of the connecting rod mechanism, the plurality of roller bits 2 will turn over outward, and the pdc bit 1 will slide to extend; when the bit device is excavated, the roller bit 2 is started to increase the mining efficiency, and when the roller bit 2 is about to be leveled, the roller bit 2 is retracted, so as to complete the bit switching and adopt the pdc bit 1 for mining.

[0107] In combination with the above, while the pdc drill bit 1 slides out, the movement base 5 will pull the first ring 4 to move through the connecting line, so that the first flow guide hole 4.1 of the first ring 4 is dislocated with the first duct hole 3.3 of the fixed base 3, and the communication between the first duct hole 3.2 and the first ring cavity 3.1 is blocked, at this time, the drilling fluid in the first ring cavity 3.1 will lose pressure, and the telescopic mechanism is in a pressure loss state; after the telescopic mechanism loses pressure, the movement base 5 will reset, that is, make a second linear motion towards the fixed base 3, during the process of returning to the original position, the roller bit 2 will be retracted under the linkage of the connecting rod mechanism, and the pdc drill bit 1 slides back, so as to switch to the roller bit 2 for mining, and a telescopic and drill bit switching process is completed, and it should be noted that the pdc drill bit 1 will hit the first ring 4 when resetting, so that the first ring 4 returns to the original position.

[0108] It can be seen that, compared with the prior art, the oil drilling drill bit device can realize the switching of two oil drilling drill bits, so that it can be suitable for more terrains; the use life of the drill bit is improved by using the oil drilling drill bit device, and the drill bit does not need to be replaced frequently, thereby reducing the maintenance cost.

[0109] The structure and shape of the oil drilling drill bit device provided in the embodiment will be described in detail as follows: Figures 1 to 26 The structure and shape of the oil drilling drill bit device provided in the embodiment will be described in detail as follows:

[0110] More preferably, referring to Figures 1 to 10 , the telescopic mechanism comprises a piston rod 6, a pressure cylinder 7 and a tension spring 8; the piston rod 6 is fixedly connected with the movement base 5; the pressure cylinder 7 is sleeved on the piston rod 6 and fixedly connected with the fixed base 3 and communicates with the first ring cavity 3.1; the tension spring 8 is sleeved on the pressure cylinder 7 and connected between the fixed base 3 and the movement base 5, and the tension spring 8 makes the movement base 5 have a tendency to make a second linear motion.

[0111] Referring to Figure 4 , when the drilling fluid flows through the two first flow guide holes 4.1 around the first ring 4, part of the drilling fluid will flow into the first ring cavity 3.1 due to the coincidence of the first flow guide hole 4.1 and the first duct hole 3.3, so that the inside of the pressure cylinder 7 is pressurized, thereby pushing the four piston rods 6 at the bottom of the movement base 5 to move upward and stretch the tension spring 8, and the movement base 5 moves upward synchronously; the bottom of the movement base 5 is provided with a steel wire rope, and the steel wire rope is connected with the first ring 4, so that when the movement base 5 moves upward, the first ring 4 is pulled to move upward. After the drilling fluid in the first ring cavity 3.1 loses pressure, the movement base 5 moves downward under the action of the restoring force of the tension spring 8 and returns to the original position.

[0112] Further, in combination with Figures 4 to 10As shown, the moving base 5 has a second ring cavity 5.1 extending along the circumference of a second hole channel for passing the pdc drill bit 1 and communicating with the first hole channel 3.2; the drill bit telescopic assembly further comprises a water washing mechanism including a touch rod 9, a bellows 10, a first one-way valve 11 and a spray pipe 12; the touch rod 9 is fixedly connected with the moving base 5; the bellows 10 is sleeved on the touch rod 9 and fixedly connected between the moving base 5 and the fixed base 3, and the two ends of the bellows 10 are respectively communicated with the first ring cavity 3.1 and the second ring cavity 5.1; the first one-way valve 11 is arranged in the bellows 10 and between the touch rod 9 and the fixed base 3; the spray pipe 12 is fixedly connected with the moving base 5 and communicated with the second ring cavity 5.1.

[0113] Specifically, when the moving base 5 is pulled back under the action of the tension spring 8, after a certain stroke, the moving base 5 will stop moving because the first ring cavity 3.1 still has residual drilling fluid in the pressure cylinder 7 which has not been discharged. At this time, the touch rod 9 below the moving base 5 will trigger the first one-way valve 11 due to the downward movement of the moving base 5, so that the first one-way valve 11 is disabled, and the residual drilling fluid will flow into the bellows 10 through the first one-way valve 11 and enter the second ring cavity 5.1, and finally be sprayed to the surface of the drill bit through the spray pipe 12, thereby cleaning the surface of the drill bit. It should be noted that in the initial state, the touch rod 9 will trigger the first one-way valve 11 to disable it, but when the pressure cylinder 7 is filled with drilling fluid, the discharge amount of the outlet of the first one-way valve 11 is less than the injection amount of the pressure cylinder 7, and the moving base 5 will move and close the first one-way valve 11 after a certain stroke.

[0114] More preferably, referring to Figures 4 to 6 , the connecting rod mechanism includes a roller fixed seat 13, a connecting rod 14, a guide column 15 and a crowbar 16; the roller fixed seat 13 is fixedly connected with the moving base 5, and the roller drill bit 2 is hinged to the roller fixed seat 13; one end of the connecting rod 14 is hinged to the roller drill bit 2, and the other end is hinged to the fixed base 3; the guide column 15 is rotationally matched with the roller fixed seat 13; one end of the crowbar 16 is hinged to the connecting rod 14, and the other end extends through the guide column 15 in a direction perpendicular to the rotation axis of the guide column 15 and is inserted into the pdc drill bit 1.

[0115] Specifically, taking Figure 4 as an example, when the moving base 5 moves upward, the connecting rod 14 will rotate, thereby driving the three roller drill bits 2 above to perform outward turning, and at the same time, the connecting rod 14 will drive the crowbar 16 to perform lever movement, thereby driving the pdc drill bit 1 to move upward and extend.

[0116] With regard to the roller bit 2, in particular:

[0117] With reference to Figures 11 to 15 , the roller bit 2 comprises a linear driver 2.1, a first roller 2.2 and a plurality of second rollers 2.3; the first roller 2.2 and the plurality of second rollers 2.3 are sequentially distributed in the driving direction of the linear driver 2.1; the first roller 2.2 is in sliding connection with the second rollers 2.3, and the second rollers 2.3 in adjacent layers are also in sliding connection; the body of the linear driver 2.1 is arranged at the second rollers 2.3 away from the first roller 2.2, and the driving end is fixedly connected with the first roller 2.2.

[0118] In particular, with reference to Figures 11 to 15 , the first roller 2.2 comprises a first protrusion 2.2.1, a first base 2.2.2, a first end cover 2.2.6, and a first motor 2.2.3, a rotating wheel 2.2.4 and a moving ring 2.2.5 arranged on the first base 2.2.2; a plurality of first protrusions 2.2.1 are arranged on the side wall of the first base 2.2.2 in a circumferential direction of the first base 2.2.2, and are hingedly connected with the first base 2.2.2, and the mining end of the first protrusion 2.2.1 is outside the first base 2.2.2; the first motor 2.2.3 is in transmission connection with the rotating wheel 2.2.4; the side surface of the rotating wheel 2.2.4 is provided with a wavy sliding groove in a circumferential direction of the rotating wheel 2.2.4; the moving ring 2.2.5 is sleeved on the rotating wheel 2.2.4, and the inner wall of the moving ring 2.2.5 is provided with two symmetrically arranged protrusions for matching the sliding groove, and the outer wall of the moving ring 2.2.5 is provided with a limiting groove extending in a circumferential direction of the moving ring 2.2.5 for accommodating one end of the first protrusion 2.2.1 away from the mining end; the first base 2.2.2 is connected with the driving end of the linear driver 2.1.

[0119] The second roller 2.3 comprises a second protrusion 2.3.1, a second base 2.3.2, a second end cover 2.3.6, and a compression spring 2.3.3, a second motor 2.3.4 and a rotating disc 2.3.5 arranged on the second base 2.3.2; the second protrusion 2.3.1 penetrates through the side wall of the second base 2.3.2, and a plurality of second protrusions 2.3.1 are distributed in a circumferential direction of the second base 2.3.2; the compression spring 2.3.3 corresponds to the second protrusion 2.3.1 one by one, and is connected between the second protrusion 2.3.1 and the second base 2.3.2, so that the second protrusion 2.3.1 has a tendency to move towards the inside of the second base 2.3.2; the second motor 2.3.4 is in transmission connection with the rotating disc 2.3.5; the side wall of the rotating disc 2.3.5 cooperates with the second protrusion 2.3.1 through a first inclined wedge structure; in two adjacent second rollers 2.3, the second base 2.3.2 of one of the second rollers 2.3 is in sliding connection with the second end cover 2.3.6 of the other second roller 2.3; the first base 2.2.2 is in sliding connection with the second end cover 2.3.6 of the adjacent second roller 2.3.

[0120] In the above design, in combination with Figures 11 to 15 As shown, the linear driver 2.1 has two groups, which can adopt an electric push rod. The electric push rod is telescopic, so that the first roller 2.2 and the second roller 2.3 can be telescopic, realizing the telescopic of the roller bit 2; when the first motor 2.2.3 is started, the rotating wheel 2.2.4 rotates, and through the cooperation of the sliding slot and the two protrusions, the movement ring 2.2.5 moves up and down, thereby pressing the first protrusion 2.2.1 to swing up and down; when the second motor 2.3.4 is started, the rotating disc 2.3.5 rotates, pushes the second protrusion 2.3.1 out, and compresses the compression spring 2.3.3; after the rotating disc 2.3.5 rotates to lose cooperation with the second protrusion 2.3.1, under the action of the restoring force of the compression spring 2.3.3, the second protrusion 2.3.1 is retracted.

[0121] Regarding the pdc bit 1, in particular:

[0122] Referring to Figure 16 and Figure 17 , the pdc bit 1 comprises a bit body 1.1, a third protrusion 1.2, an elastic member 1.3, and a reset rod 17; one end surface of the bit body 1.1 is provided with a guide groove 1.1.1 extending between the axis and the side surface of the bit body 1.1 along the radial direction of the bit body 1.1; the third protrusion 1.2 is embedded in the guide groove 1.1.1 and can slide along the extension direction of the guide groove 1.1.1; the elastic member 1.3 is arranged in the guide groove 1.1.1 and connected with the bit body 1.1 and the third protrusion 1.2 respectively, and the elastic member 1.3 makes the third protrusion 1.2 have a tendency to slide away from the axis of the bit body 1.1; the reset rod 17 is fixedly connected to the movement base 5, and the end of the reset rod 17 away from the movement base 5 is matched with the third protrusion 1.2 through a second inclined wedge structure.

[0123] Specifically, in combination with Figure 1 , Figure 16 and Figure 17 As shown, when the movement base 5 is pulled back to the original position by the tension spring 8, the pdc bit 1 will move downward under the action of the crowbar 16 to shrink, and at the same time, the inclined angle above the reset rod 17 will force the third protrusion 1.2 on the surface of the pdc bit 1 in the variable-diameter state to reset.

[0124] Further, referring to Figures 1 to 3 and Figures 18 to 26, the petroleum drilling bit device further comprises an anti-stuck force adding assembly; the anti-stuck force adding assembly comprises a force adding base 18, a guide pipe 19, a second ring 20, a drill rod connecting cylinder 21 and a force adding mechanism; one end of the force adding base 18 is fixedly connected with the fixed base 3, and the other end is rotatably connected with the drill rod connecting cylinder 21; the force adding base 18 is provided with a third hole channel, which is in communication with the first hole channel 3.2 and the drill rod connecting cylinder 21 respectively; the sidewall of the drill rod body is provided with a second channel hole 18.1; one end of the guide pipe 19 is in communication with the second channel hole 18.1, and the other end extends to the force adding mechanism and is in communication with the force adding mechanism; the second ring 20 is rotatably connected with the force adding base 18 and is located between the second channel hole 18.1 and the guide pipe 19 to block the communication between the second channel hole 18.1 and the guide pipe 19; the sidewall of the second ring 20 is provided with a second flow guide hole 20.1, which is distributed in a staggered manner with the second channel hole 18.1 in an initial state; the drill rod connecting cylinder 21 is connected with the second ring 20 through a transmission seat 26, and a first spring 22 is connected between the drill rod connecting cylinder 21 and the force adding base 18; the first spring 22 makes the force adding base 18 have a tendency to rotate synchronously with the drill rod connecting cylinder 21; the force adding mechanism is arranged on the force adding base 18 and is configured to impact the force adding base 18 under a pressure charging condition, so that the force adding base 18 has a tendency to rotate around the axis of the drill rod connecting cylinder 21.

[0125] Specifically, referring to Figures 18 to 26 the force adding mechanism comprises a knocking block 23 and a driving assembly 24; the inner wall of the force adding base 18 is provided with a knocking block 18.2; the knocking block 23 is rotatably connected with the force adding base 18 and is provided with a second spring 25 between the force adding base 18; the second spring 25 makes the knocking block 23 have a tendency to rotate to impact the knocking block 18.2 under a deformation condition; the driving assembly 24 is drivingly connected with the knocking block 23 through an incomplete gear structure to drive the knocking block 23 to rotate, so as to deform the second spring 25; the driving assembly 24 is provided with two and is symmetrically distributed about the axis of the third hole channel; the driving assembly 24 comprises a driving box and an impeller 24.1; the driving box is in communication with the guide pipe 19 and is also in communication with an overflow hole 18.3 on the force adding base 18; a second one-way valve is arranged at the communication position of the two, which is used to discharge the drilling fluid in the driving box and prevent the drilling fluid outside the bit device from entering the driving box; the impeller 24.1 is located in the driving box, a half gear is mounted below the impeller 24.1, the half gear is meshed with a full gear on the knocking block 23, and the upper part of the half gear is connected with the impeller 24.1 in the other driving assembly 24 through a gear and a synchronous belt to realize speed synchronization.

[0126] In combination with Figures 1 to 3 and Figures 18 to 26As shown, when the drill bit encounters a foreign object and gets stuck, the force base 18 stops rotating, the drill pipe continues to apply torque, which causes the first spring 22 to be compressed, and at the same time drives the transmission base 26 integrated with the drill pipe connecting cylinder 21 to rotate, the special-shaped connecting rod 14 at the top of the transmission base 26 rotates synchronously, and drives the second circular ring 20 to rotate (the second circular ring 20 is installed inside the interlayer of the force base 18), so that the second flow guide hole 20.1 of the second circular ring 20 coincides with the second duct hole 18.1, in this way, the drilling fluid will pass through the second duct hole 18.1 and the second flow guide hole 20.1 into the guide pipe 19, and then into the drive box to impact the impeller 24.1; the impeller 24.1 rotates under the impact of the drilling fluid, and drives the half gear below it to rotate, here, the synchronous belt synchronizes the rotation speed of the two half gears, and the half gear rotates at the same time to drive the large gear at the center of the knocking block 23 to rotate, thereby driving the knocking block 23 to move; the knocking block 23 stretches the second spring 25 when it moves to store energy, and when the knocking block 23 moves a certain angle, the half gear rotates to the side without teeth, at this time the large gear at the center of the knocking block 23 is lost, and the knocking block 23 is quickly reset under the restoring force of the second spring 25, thereby impacting the knocking block 18.2 once, giving the force base 18 an impact force; until the force base 18 rotates synchronously with the drill pipe, the first spring 22 resets, the special-shaped connecting rod 14 drives the second circular ring 20 to reset, the second flow guide hole 20.1 and the second duct hole 18.1 are again misaligned, preventing the drilling fluid from entering the guide pipe 19, at this time the impeller 24.1 stops rotating, and the knocking block 23 stops impacting, otherwise the knocking block 23 will keep impacting until the drill bit is unstuck.

[0127] The working process of the petroleum drilling bit device provided by the embodiment is as follows:

[0128] Reference Figures 1 to 26 In the embodiment, when drilling operation is needed, the drill pipe is connected to the drill pipe connecting cylinder 21 at the end, the drilling fluid is injected into the drill pipe, the petroleum drilling bit device is placed in the well, and the excavation is started.

[0129] In the normal working state, the drilling fluid flows in the center of the drill bit, part of the drilling fluid will enter the first circular ring 4 through the annular cavity between the first duct hole 3.3 inner wall and the forced base 18, when flowing through the two first guide holes 4.1 around the first circular ring 4, the drilling fluid will flow into the first annular cavity 3.1 due to the coincidence of the first guide hole 4.1 and the first duct hole 3.3 of the fixed base 3, so as to cause the internal pressure of the pressure cylinder 7, push the four piston rods 6 at the bottom of the moving base 5 to move upward, thus driving the moving base 5 to move upward; while the moving base 5 moves upward, the connecting rod 14 rotates, thus driving the three roller bits 2 above to turn outward, while the connecting rod 14 rotates, it will also drive the crowbar 16 to move as a lever, thus prying the pdc drill bit 1 to move upward and extend; when the drill bit is excavated, the two groups of electric push rods inside the roller bit 2 can be controlled in real time to control the extension and contraction of the roller bit 2, the second motor 2.3.4 is controlled to drive the turntable 2.3.5 to rotate to push the second protrusion 2.3.1 out, the first motor 2.2.3 is controlled to drive the rotating wheel 2.2.4 to rotate to drive the moving ring 2.2.5 to move up and down, thus pressing the first protrusion 2.2.1 to swing up and down, to increase the mining efficiency; when the roller bit 2 is about to be leveled, the driving electric push rod will shrink the roller bit 2, the third protrusion 1.2 of the pdc drill bit 1 will be pushed to the outer ring of the drill bit under the action of the elastic member 1.3 (such as spring), at this time, the pdc drill bit 1 is switched to mining.

[0130] As mentioned above, while the pdc drill bit 1 moves upward, the moving base 5 will pull the first circular ring 4 upward through the steel wire rope, so that the first guide hole 4.1 of the first circular ring 4 is dislocated with the first duct hole 3.3 of the fixed base 3, at this time, the drilling fluid in the first annular cavity 3.1 loses pressure, the moving base 5 is pulled back under the action of the tension spring 8; after a certain stroke is pulled back, because there is residual drilling fluid in the first annular cavity 3.1 and the pressure cylinder 7 which has not been discharged, it will stop moving, at this time, the touch rod 9 below the moving base 5 will touch the first check valve 11 due to the downward movement of the moving base 5, so that the first check valve 11 is disabled, then the drilling fluid in the pressure cylinder 7 and the first annular cavity 3.1 will flow into the corrugated pipe 10 through the first check valve 11, and finally be sprayed to the surface of the drill bit through the nozzle 12, which plays a role of cleaning the surface of the drill bit.

[0131] Continuing the above, when the moving base 5 returns to the original position under the pulling force of the pull spring 8, the roller bit 2 will retract under the linkage of the connecting rod 14, and at the same time, the pdc bit 1 will also move downward under the action of the crowbar 16, and retract; during the retraction, the bevel above the reset rod 17 will force the third protrusion 1.2 on the surface of the pdc bit 1 in the variable diameter state to reset, and at the same time, the bottom of the moving base 5 will hit the first circular ring 4, and the first circular ring 4 will be hit back to the original position, and the first flow guide hole 4.1 of the first circular ring 4 is in communication with the first duct hole 3.3, at this time, the roller bit 2 is switched to mining, and a stretching and retracting and bit switching process is completed.

[0132] When the drill bit encounters a foreign object and gets stuck, since the force base 18 does not rotate, the drill rod continues to apply a torque, which will cause the first spring 22 to be compressed, and at the same time, the special-shaped connecting rod 14 at the top of the drill rod connecting cylinder 21 will rotate, the rotation of the special-shaped connecting rod 14 will drive the second circular ring 20 to rotate, so that the second flow guide hole 20.1 inside the second circular ring 20 coincides with the second duct hole 18.1, so that the drilling fluid at the center of the drill bit will enter the inside of the conduit 19 through the second flow guide hole 20.1 and the second duct hole 18.1, impact the impeller 24.1 inside the drive box, and make the impeller 24.1 rotate; when the impeller 24.1 rotates, the half gear below it rotates synchronously, and drives the large gear at the center of the knocking block 23 to rotate, thereby driving the knocking block 23 to move, and the knocking block 23 rotates to stretch the second spring 25; when the knocking block 23 moves by a certain angle, the half gear rotates to the side without teeth, and is no longer meshed with the large gear, at this time, the knocking block 23 will quickly reset under the restoring force of the second spring 25, thereby impacting the impact block 18.2 on the force base 18 once, giving the force base 18 an impact force, until the force base 18 rotates synchronously with the drill rod.

[0133] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An oil drilling bit assembly, characterized in that, include: The drill bit telescopic assembly includes a PDC drill bit (1) and a roller cone drill bit (2); the drill bit telescopic assembly includes a fixed base (3), a first ring (4), a moving base (5), a telescopic mechanism, and a linkage mechanism; The fixed base (3) has a first annular cavity (3.1) and a first channel (3.2). The first annular cavity (3.1) extends circumferentially along the first channel (3.2). A first duct hole (3.3) connecting the first channel (3.2) and the first annular cavity (3.1) is provided on the side wall. The first ring (4) is inserted into the fixed base (3) through the first channel (3.2), and the side wall of the first ring (4) is provided with a first guide hole (4.1) facing the first duct hole (3.3); The moving base (5) is inserted into the fixed base (3) through the first channel (3.2) and connected to the first ring (4) through a connecting line; The telescopic mechanism is connected between the fixed base (3) and the moving base (5) and communicates with the first annular cavity (3.1). The telescopic mechanism is configured to drive the moving base (5) to make a first linear movement away from the fixed base (3) under pressurized conditions, and to drive the moving base (5) to make a second linear movement closer to the fixed base (3) under depressurized conditions. The PDC drill bit (1) is inserted into the moving base (5); The roller cone drill bit (2) can extend and retract along its own axis, and multiple roller cone drill bits (2) are provided, which are spaced apart on the moving base (5) around the axis of the PDC drill bit (1); The linkage mechanism corresponds one-to-one with the roller cone drill bit (2) and is connected to the roller cone drill bit (2), the PDC drill bit (1), the moving base (5), and the fixed base (3) respectively. When the moving base (5) makes a first linear motion, the linkage mechanism can drive the roller cone drill bit (2) to rotate outward and drive the PDC drill bit (1) to slide outward and extend the roller cone drill bit (2). When the moving base (5) makes a second linear motion, the linkage mechanism can drive the roller cone drill bit (2) to rotate inward and drive the PDC drill bit (1) to slide outward and retract the roller cone drill bit (2).

2. The oil drilling bit assembly according to claim 1, characterized in that, The telescopic mechanism includes a piston rod (6), a pressure cylinder (7), and a tension spring (8); The piston rod (6) is fixedly connected to the moving base (5); The pressure cylinder (7) is sleeved on the piston rod (6) and fixedly connected to the fixed base (3), and communicates with the first annular cavity (3.1); The tension spring (8) is sleeved on the pressure cylinder (7) and connected between the fixed base (3) and the moving base (5). The tension spring (8) causes the moving base (5) to have a tendency to make a second linear motion.

3. The oil drilling bit assembly according to claim 2, characterized in that, The motion base (5) has a second annular cavity (5.1) and a second channel. The second annular cavity (5.1) extends circumferentially along the second channel. The second channel is used to pass through the PDC drill bit (1) and communicates with the first channel (3.2). The drill bit telescopic assembly also includes a water washing mechanism, which includes a contact rod (9), a bellows (10), a first one-way valve (11), and a nozzle (12); The contact rod (9) is fixedly connected to the moving base (5); The corrugated tube (10) is sleeved on the contact rod (9) and fixedly connected between the moving base (5) and the fixed base (3), and the two ends of the corrugated tube (10) are respectively connected to the first annular cavity (3.1) and the second annular cavity (5.1); The first one-way valve (11) is disposed inside the bellows (10) and is located between the contact rod (9) and the fixed base (3); The nozzle (12) is fixedly connected to the moving base (5) and communicates with the second annular cavity (5.1).

4. The oil drilling bit assembly according to claim 1, characterized in that, The linkage mechanism includes a toothed wheel fixing seat (13), a connecting rod (14), a guide post (15), and a pry bar (16); The roller cone fixing seat (13) is fixedly connected to the moving base (5), and the roller cone drill bit (2) is hinged to the roller cone fixing seat (13); One end of the connecting rod (14) is hinged to the roller cone drill bit (2), and the other end is hinged to the fixed base (3); The guide post (15) is rotatably engaged with the toothed wheel fixing seat (13); One end of the pry bar (16) is hinged to the connecting rod (14), and the other end extends along the direction perpendicular to the rotation axis of the guide post (15) to pass through the guide post (15) and is inserted into the PDC drill bit (1).

5. The oil drilling bit assembly according to claim 1, characterized in that, The roller cone drill bit (2) includes a linear actuator (2.1), a first roller cone (2.2), and a multi-layer second roller cone (2.3); In the driving direction of the linear actuator (2.1), the first toothed wheel (2.2) and the multi-layered second toothed wheel (2.3) are distributed sequentially; The first toothed cone (2.2) and the second toothed cone (2.3) are slidably connected, and the second toothed cones (2.3) in adjacent layers are also slidably connected; The body of the linear actuator (2.1) is disposed on the second gear (2.3) away from the first gear (2.2), and the driving end is fixedly connected to the first gear (2.2).

6. The oil drilling bit assembly according to claim 5, characterized in that, The first gear (2.2) includes a first protrusion (2.2.1), a first base (2.2.2), and a first motor (2.2.3), a rotating wheel (2.2.4), and a moving ring (2.2.5) mounted on the first base (2.2.2). Along the circumference of the first base (2.2.2), a plurality of first protrusions (2.2.1) are spaced apart on the sidewall of the first base (2.2.2) and hinged to the first base (2.2.2), and the mining end of the first protrusion (2.2.1) is outside the first base (2.2.2); The first motor (2.2.3) is connected to the rotating wheel (2.2.4) via a transmission connection; Along the circumference of the rotating wheel (2.2.4), the side of the rotating wheel (2.2.4) is provided with undulating grooves; The moving ring (2.2.5) is sleeved on the rotating wheel ( 2.2.4), its inner wall is provided with a protrusion to be adapted to the chute, and its outer wall is provided with a limiting groove extending circumferentially to accommodate the end of the first protrusion (2.2.1) away from the mining end.

7. The oil drilling bit assembly according to claim 5, characterized in that, The second gear (2.3) includes a second protrusion (2.3.1), a second base (2.3.2), and a compression spring (2.3.3), a second motor (2.3.4), and a turntable (2.3.5) seated on the second base (2.3.2); The second protrusion (2.3.1) passes through the side wall of the second base (2.3.2), and a plurality of the second protrusions (2.3.1) are spaced apart along the circumference of the second base (2.3.2); The compression spring (2.3.3) corresponds one-to-one with the second protrusion (2.3.1) and is connected between the second protrusion (2.3.1) and the second base (2.3.2). The compression spring (2.3.3) causes the second protrusion (2.3.1) to have a tendency to move into the second base (2.3.2). The second motor (2.3.4) is connected to the turntable (2.3.5) via a transmission connection; The sidewall of the turntable (2.3.5) engages with the second protrusion (2.3.1) via a first wedge structure.

8. The oil drilling bit assembly according to claim 1, characterized in that, The PDC drill bit (1) includes a drill bit body (1.1), a third protrusion (1.2), an elastic element (1.3), and a reset rod (17); The drill bit body (1.1) has a guide rail groove (1.1.1) on one end face, and the guide rail groove (1.1.1) extends radially between the axis and the side of the drill bit body (1.1). The third protrusion (1.2) is embedded in the guide groove (1.1.1) and can slide along the extension direction of the guide groove (1.1.1); The elastic element (1.3) is disposed in the guide groove (1.1.1) and is connected to the drill bit body (1.1) and the third protrusion (1.2) respectively. The elastic element (1.3) causes the third protrusion (1.2) to have a tendency to slide away from the axis of the drill bit body (1.1). A reset rod (17) is fixedly connected to the motion base (5). The end of the reset rod (17) away from the motion base (5) is engaged with the third protrusion (1.2) through a second wedge structure.

9. The oil drilling bit apparatus according to any one of claims 1 to 8, characterized in that, The oil drilling bit assembly also includes an anti-sticking force assembly; The anti-jamming force-applying assembly includes a force-applying base (18), a guide tube (19), a second ring (20), a drill pipe connecting sleeve (21), and a force-applying mechanism; One end of the force-adding base (18) is fixedly connected to the fixed base (3), and the other end is rotatably connected to the drill rod connecting cylinder (21). The force-adding base (18) has a third channel, which is connected to the first channel (3.2) and the drill rod connecting cylinder (21) respectively. A second duct hole (18.1) is provided on the side wall of the drill rod body. One end of the conduit (19) is connected to the second duct hole (18.1), and the other end extends to the force-applying mechanism and is connected to the force-applying mechanism; The second ring (20) is rotatably engaged with the force-applying base (18) and is positioned between the second duct hole (18.1) and the conduit (19) to block the communication between the second duct hole (18.1) and the conduit (19). A second flow guide hole (20.1) is provided on the side wall of the second ring (20), and the second flow guide hole (20.1) is misaligned with the second duct hole (18.1) in the initial state. The drill pipe connecting cylinder (21) is connected to the second ring (20) in a transmission connection, and a first spring (22) is connected between it and the force-applying base (18). The first spring (22) causes the force-applying base (18) to have a tendency to rotate synchronously with the drill pipe connecting cylinder (21). The force-applying mechanism is disposed on the force-applying base (18) and configured to impact the force-applying base (18) under pressurization conditions, causing the force-applying base (18) to have a tendency to rotate around the axis of the drill pipe connecting cylinder (21).

10. The oil drilling bit apparatus according to claim 9, characterized in that, The force-applying mechanism includes a striking block (23) and a drive assembly (24); The inner wall of the force-adding base (18) is provided with an impact block (18.2); The striking block (23) is rotatably engaged with the force-applying base (18), and a second spring (25) is provided between the striking block (23) and the force-applying base (18). Under deformation conditions, the second spring (25) causes the striking block (23) to rotate to collide with the impact block (18.2). The drive assembly (24) is connected to the striking block (23) via an incomplete gear structure to drive the striking block (23) to rotate, thereby deforming the second spring (25).

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