Pulse impact device for PDC (Polycrystalline Diamond Compact) bit

Abstract

The utility model belongs to the technical field of PDC drill bits, and particularly relates to a PDC drill bit pulse impact device which comprises a hollow rod. The shell is rotationally arranged at the bottom of the hollow rod; the drill bit base body is coupled to the bottom of the shell, the drill bit base body is of a hollow structure, and a plurality of second fixed cutting teeth are arranged in the circumferential direction of the drill bit base body; the sliding plug is arranged in the drill bit base body in a sliding mode and matched with the drill bit base body in a radial limiting mode. The end is coupled to the bottom of the sliding plug and located on the outer side of the drill bit base body, and a plurality of first fixed cutting teeth are arranged at the bottom end of the end; the linear reciprocating mechanism is arranged in the shell, is in transmission connection with the sliding plug and is used for driving the sliding plug to do linear reciprocating motion; and the rotation driving structure is in transmission connection with the sliding plug and used for driving the sliding plug to rotate, and the rotation driving structure is arranged in the hollow rod. The device is simple in structure, low in sealing performance and assembling precision requirements and high in cutting and rock breaking efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of PDC drill bits, in particular to a pulsating impact device for a PDC drill bit. Background Art

[0002] PDC drill bit is a polycrystalline diamond composite drill bit. As a commonly used drill bit in the drilling field, its excellent performance is not only reflected in its hardness and wear resistance, but also in its wide range of application scenarios and continuous innovative development.

[0003] The current PDC drill bits often include two forms: single rotation or pulsating impact rotation. For single rotation, mechanical structure transmission is often used, and the cutting force is more stable and reliable; while pulsating impact rotation uses hydraulic power to achieve pulsating impact transmission, which has high rock breaking efficiency, resulting in higher requirements on sealing and assembly accuracy. If the two can be combined, it can not only improve the cutting and rock breaking efficiency and performance, but also reduce the requirements on sealing and assembly accuracy, thereby achieving cost reduction and efficiency improvement. Therefore, we propose a PDC drill bit pulsating impact device. Utility Model Content

[0004] The utility model aims to provide a PDC drill bit pulsation impact device to solve the above problems.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] A PDC drill bit pulsation impact device, comprising:

[0007] Hollow rod;

[0008] A housing, rotatably disposed at the bottom of the hollow rod;

[0009] A drill bit base body, axially connected to the bottom of the housing, the drill bit base body is a hollow structure, and a plurality of second fixed cutting teeth are arranged circumferentially on the drill bit base body;

[0010] A sliding plug, slidably disposed in the drill bit base, the sliding plug and the drill bit base being radially limited and matched;

[0011] A tip, axially connected to the bottom of the sliding plug and located outside the drill bit base, wherein a plurality of first fixed cutting teeth are arranged at the bottom of the tip;

[0012] A linear reciprocating mechanism, disposed in the housing and drivingly connected to the sliding plug, for driving the sliding plug to perform linear reciprocating motion;

[0013] The rotation driving structure is in driving connection with the sliding plug and is used for driving the sliding plug to rotate. The rotation driving structure is arranged in the hollow rod.

[0014] Preferably, the linear reciprocating mechanism includes a plurality of arc-shaped wedges, which are circumferentially and equidistantly fixed on the top of the sliding plug. The top surface of the arc-shaped wedge is in contact with the bottom end of the ejector rod. The top ends of a plurality of the ejector rods are fixed to the bottom of the fixed sleeve, and the fixed sleeve is fixedly connected to the bottom of the hollow rod through a fixed collar;

[0015] A connector is axially connected to the top of the sliding plug. The connector is vertically slidably arranged in the fixed sleeve. A support ring is axially connected to the bottom end of the fixed sleeve. The support ring is sleeved outside the connector. The connector is slidably connected to the support ring. An elastic part is arranged between the top end of the connector and the support ring;

[0016] The connector is in transmission connection with the rotation driving structure.

[0017] Preferably, the elastic part includes a first return spring. The first return spring is coaxially sleeved outside the connector. The top of the first return spring abuts against the top of the connector, and the bottom of the first return spring abuts against the top of the support ring.

[0018] Preferably, the rotation driving structure includes a drill pipe, and the drill pipe is rotatably arranged in the hollow rod;

[0019] A bushing is axially connected to the bottom end of the drill pipe. A spline groove is formed in the inner wall of the bushing. A spline shaft is arranged in cooperation with the bushing. The bushing is radially limited and cooperated with the spline shaft. The bushing is vertically slidably connected to the spline shaft. The bottom end of the spline shaft is axially connected to the top end of the connector;

[0020] The bushing is rotatably arranged in the fixed sleeve.

[0021] Preferably, a sealing ring is axially connected to the inner side of the top of the drill bit base body. The sealing ring is sleeved outside the fixed sleeve, and the fixed sleeve is movably connected to the sealing ring.

[0022] Preferably, the housing is in transmission connection with a plurality of sliding cutting teeth, and the plurality of sliding cutting teeth are arranged in a matrix around the side wall of the drill bit base body.

[0023] Preferably, a plurality of second wedge blocks are fixedly connected to the side wall of the housing, and the plurality of second wedge blocks correspond to the plurality of sliding cutting teeth one by one; one end of a pressure rod is in contact with the side wall of the second wedge block, and the other end of the pressure rod is fixedly connected to the sliding cutting tooth. The sliding cutting tooth slides horizontally in a chute formed in the side wall of the drill bit base body. A first limiting ring is sleeved outside the pressure rod, and the first limiting ring is fixedly connected to the pressure rod. The first limiting ring is slidably arranged in the chute. The pressure rod is slidably connected to a second limiting ring, and the second limiting ring is fixedly connected in the chute. The second limiting ring is sleeved outside the pressure rod. A second elastic part is arranged between the first limiting ring and the second limiting ring.

[0024] Preferably, the second elastic part includes a second return spring. The second return spring is sleeved outside the pressure rod. One end of the second return spring abuts against the side wall of the second limiting ring, and the other end of the second return spring abuts against the side wall of the first limiting ring.

[0025] Compared with the prior art, the utility model has the following advantages and technical effects:

[0026] During use, the sliding plug is driven to rotate by rotating the driving structure. When the sliding plug rotates, due to the radial limiting fit between the sliding plug and the drill bit base body, the sliding plug is axially connected to the end head, and the sliding plug can drive the drill bit base body and the end head to rotate simultaneously. Under the action of the linear reciprocating mechanism, the sliding plug is driven to move linearly back and forth, so that the end head generates pulse impact during rotation, and then drives the first fixed cutting tooth and the second fixed cutting tooth to perform effective rotary cutting. Compared with the prior art, it can effectively carry out drilling work, improve the cutting rock-breaking efficiency, and adopt a mechanical transmission method instead of a hydraulic transmission method to convert the torque of the drill pipe, which can reduce the implementation difficulty of the device, reduce the sealing requirements and the matching accuracy, and the structure is simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts:

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 is Figure 1 the enlarged schematic diagram at A in

[0030] Figure 3 It is a top view schematic diagram of the sleeve connection relationship;

[0031] Figure 4 It is a top view schematic diagram of the connection relationship of the sliding plug;

[0032] Figure 5 It is a top view of the fixed sleeve.

[0033] Among them, 1. drill bit base; 2. outer shell; 3. hollow rod; 4. drill rod; 5. sliding cutting teeth; 6. second fixed cutting teeth; 7. end; 8. first fixed cutting teeth; 9. bushing; 10. fixed ring sleeve; 11. spline shaft; 12. fixed sleeve; 13. first return spring; 14. connector; 15. support ring; 16. push rod; 17. arc wedge block; 18. sliding plug; 19. sealing ring; 501. pressure rod; 502. second wedge block; 503. first limit ring; 504. second return spring; 505. second limit ring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] Reference Figures 1 to 5 The utility model discloses a PDC drill bit pulsation impact device, comprising:

[0037] Hollow rod 3;

[0038] The housing 2 is rotatably disposed at the bottom of the hollow rod 3;

[0039] The drill base body 1 is axially connected to the bottom of the housing 2. The drill base body 1 is a hollow structure. A plurality of second fixed cutting teeth 6 are arranged circumferentially on the drill base body 1.

[0040] A sliding plug 18 is slidably disposed in the drill bit base body 1, and the sliding plug 18 is radially limited and matched with the drill bit base body 1;

[0041] The end head 7 is axially connected to the bottom of the sliding plug 18 and is located outside the drill base 1. A plurality of first fixed cutting teeth 8 are arranged at the bottom of the end head 7;

[0042] A linear reciprocating mechanism is disposed in the housing 2 and is transmission-connected to the sliding plug 18 to drive the sliding plug 18 to perform linear reciprocating motion;

[0043] A rotational drive structure, which is in transmission connection with the sliding plug 18 and is used to drive the sliding plug 18 to rotate. The rotational drive structure is arranged inside the hollow rod 3.

[0044] During use, the sliding plug 18 is driven to rotate through the rotational drive structure. When the sliding plug 18 rotates, since the sliding plug 18 is in radial limit fit with the drill bit base body 1 and is pivotally connected to the end head 7, the sliding plug 18 can drive the drill bit base body 1 and the end head 7 to rotate simultaneously. Under the action of the linear reciprocating mechanism, the sliding plug 18 is driven to perform linear reciprocating motion, so that the end head 7 generates pulsed impact during rotation, thereby driving the first fixed cutting teeth 8 and the second fixed cutting teeth 6 to perform effective rotary cutting. Compared with the prior art, it can effectively carry out drilling work, improve the cutting rock-breaking efficiency, and adopt a mechanical transmission method instead of a hydraulic transmission method to convert the torque of the drill pipe, which can reduce the implementation difficulty of the device, reduce the sealing requirements and the fitting accuracy, and the structure is simple and reliable.

[0045] A plurality of second fixed cutting teeth 6 are provided, which are uniformly arranged around the outer wall of the drill bit base body 1, and the second fixed cutting teeth 6 are fixedly connected to the drill bit base body 1.

[0046] A plurality of first fixed cutting teeth 8 are provided, which are circumferentially and uniformly arranged at the bottom of the end head 7, and the first fixed cutting teeth 8 are fixedly connected to the end head 7.

[0047] In a further optimized solution, the linear reciprocating mechanism includes a plurality of arc-shaped wedge blocks 17. The plurality of arc-shaped wedge blocks 17 are fixedly connected to the top of the sliding plug 18 at equal circumferential intervals. The bottom end of a push rod 16 is in contact with the top surface of the arc-shaped wedge block 17. The top ends of the plurality of push rods 16 are fixedly connected to the bottom of the fixed sleeve 12. The fixed sleeve 12 is fixedly connected to the bottom of the hollow rod 3 through a fixed ring sleeve 10;

[0048] A connector 14 is pivotally connected to the top of the sliding plug 18. The connector 14 is vertically slidably arranged inside the fixed sleeve 12. A support ring 15 is pivotally connected to the bottom end of the fixed sleeve 12. The support ring 15 is sleeved outside the connector 14. The connector 14 is slidably connected to the support ring 15. An elastic part is provided between the top end of the connector 14 and the support ring 15;

[0049] The connector 14 is in transmission connection with the rotational drive structure.

[0050] In a further optimized solution, the elastic part includes a first return spring 13. The first return spring 13 is coaxially sleeved outside the connector 14. The top of the first return spring 13 abuts against the top of the connector 14, and the bottom of the first return spring 13 abuts against the top of the support ring 15.

[0051] In a further optimized solution, the rotational drive structure includes a drill pipe 4. The drill pipe 4 is rotatably arranged inside the hollow rod 3;

[0052] The bottom end of the drill pipe 4 is axially connected with a bushing 9. The inner wall of the bushing 9 is provided with a spline groove. A spline shaft 11 is arranged in a mating manner with the bushing 9. The bushing 9 and the spline shaft 11 are in radial limit fit, and the bushing 9 and the spline shaft 11 are vertically slidably connected. The bottom end of the spline shaft 11 is axially connected with the top end of the connector 14;

[0053] The bushing 9 is rotatably arranged in the fixed sleeve 12.

[0054] The linear reciprocating mechanism includes a connector 14. The top of the sliding plug 18 is axially connected with the connector 14. The connector 14 is in transmission connection with the rotational driving mechanism. The rotational driving mechanism and the linear reciprocating mechanism are cooperated to drive the sliding plug 18 to slide up and down when the sliding plug 18 rotates; a circumferential constraint is formed between the sliding plug 18 and the drill bit base body 1 for driving the drill bit base body 1 to rotate.

[0055] The drill bit base body 1 and the sliding plug 18 are in clearance fit. The circumferential constraint between the sliding plug 18 and the drill bit base body 1 can be realized through spline teeth, protrusions, and corresponding spline grooves and limit grooves, and the sliding plug 18 can slide vertically.

[0056] The sliding plug 18 drives the drill bit base body 1 to rotate and also drives the end 7 to move up and down. Thus, the first fixed cutting tooth 8 moves up and down to generate a periodic pulsating impact, and both the first fixed cutting tooth 8 and the second fixed cutting tooth 6 perform effective rotary cutting. Compared with the prior art, the combination of fixed rotary cutting and pulsating impact cutting can effectively carry out drilling work, improve the cutting rock-breaking efficiency, and adopt a mechanical transmission method instead of a hydraulic transmission method, which can reduce the implementation difficulty of the device, reduce the sealing requirement and the matching precision, and has a simple and reliable structure.

[0057] Specifically, the rotational driving mechanism includes a drill pipe 4, a bushing 9, and a spline shaft 11;

[0058] The linear reciprocating mechanism includes a fixed ring sleeve 10, a fixed sleeve 12, a first return spring 13, a support ring 15, a push rod 16, and an arc-shaped wedge block 17;

[0059] The connector 14 is slidably arranged up and down in the fixed sleeve 12. The fixed sleeve 12 is fixedly arranged. A bushing 9 with a hollow structure is rotatably arranged in the fixed sleeve 12. A spline shaft 11 is arranged in a mating manner in the bushing 9. The spline shaft 11 is slidably arranged up and down in the bushing 9. The top of the bushing 9 is detachably connected to the bottom of the drill pipe 4 through a flange and bolts;

[0060] The fixed sleeve 12 is connected to the ejector rod 16. The bottom of the ejector rod 16 is located above the sliding plug 18. The top of the sliding plug 18 is fixedly connected to the arc-shaped wedge block 17. The bottom of the ejector rod 16 contacts the top surface of the arc-shaped wedge block 17. The arc-shaped wedge block 17 is a wedge-shaped structure and is distributed in an arc around the connector 14. One end of the arc-shaped wedge block 17 is high and the other end is low, and its top surface forms a wedge shape with a slope. The arc-shaped wedge block 17 is used to cooperate with the ejector rod 16 to make the sliding plug 18 move up and down reciprocally when rotating.

[0061] The fixed sleeve 12 and the bushing 9 are in clearance fit. The bushing 9 and the spline shaft 11 achieve circumferential constraint and sliding fit through splines. An annular interval is formed between the bottom of the connector 14 and the inner side surface of the drill bit base body 1. The arc-shaped wedge block 17 is located within this interval. When the sliding plug 18 rotates with the drill pipe 4, the fixed sleeve 12 is relatively stationary. Under the action of the arc-shaped wedge block 17 abutting against the ejector rod 16, the sliding plug 18 rotates and moves up and down reciprocally.

[0062] Furthermore, the connector 14 is a "T" - shaped structure. The inner side of the bottom of the fixed sleeve 12 is detachably connected to the support ring 15 through bolts. The support ring 15 is sleeved outside the connector 14. A first return spring 13 is arranged between the top of the support ring 15 and the top of the connector 14.

[0063] The first return spring 13 is in a compressed state and functions to support and reset the connector 14 upward.

[0064] Furthermore, the top of the fixed sleeve 12 is detachably connected to the hollow fixed ring sleeve 10 through bolts. The top of the fixed ring sleeve 10 is detachably connected to the hollow rod 3. The fixed ring sleeve 10 and the hollow rod 3 can be connected by one of screw connection, bolt connection, and flange connection. The drill pipe 4 is rotatably arranged within the hollow rod 3, and the bushing 9 rotatably passes through the fixed ring sleeve 10.

[0065] Furthermore, a notch portion is arranged on the outer side of the bottom of the hollow rod 3. The notch portion is rotatably connected to the outer shell 2. The outer shell 2 is fixedly connected to the top of the drill bit base body 1.

[0066] The hollow rod 3 and the outer shell 2 can be rotatably connected through a bearing. The outer shell 2 is a hollow annular structure and functions to stabilize the drill bit base body 1.

[0067] In the present utility model, the hollow rod 3, the fixed ring sleeve 10, and the fixed sleeve 12 are relatively stationary fixed components.

[0068] The top of the drill pipe 4 is used to connect the output end of the drilling rig, and the top of the hollow rod 3 can be fixed to the drilling rig through components such as brackets; or, the top of the drill pipe 4 is connected to a rotating device such as a motor, and the hollow rod 3 is connected to a linear motion device such as a hydraulic cylinder or a linear cylinder, thereby realizing the rotation and lifting of the drill bit base body 1.

[0069] Further, the ejector rod 16 passes through the fixed sleeve 12 and the fixed ring sleeve 10, and the ejector rod 16 is threadedly connected to the fixed ring sleeve 10.

[0070] The ejector rod 16 is vertically arranged, and a plurality of them are distributed around the axis of the fixed sleeve 12. Correspondingly, a plurality of arc-shaped wedge blocks 17 are also provided. Both the fixed sleeve 12 and the fixed ring sleeve 10 are provided with holes through which the ejector rod 16 passes, and the hole of the fixed ring sleeve 10 is a threaded hole. By rotating, the bottom height of the adjustable ejector rod 16 can be adjusted, thereby finely adjusting the up and down movement stroke of the sliding plug 18, that is, the amplitude of the periodic pulsating impact.

[0071] In a further optimized solution, a sealing ring 19 is axially connected to the inner side of the top of the drill bit base body 1. The sealing ring 19 is sleeved on the outer side of the fixed sleeve 12, and the fixed sleeve 12 is movably connected to the sealing ring 19.

[0072] In a further optimized solution, the outer shell 2 is drivingly connected with a plurality of sliding cutting teeth 5, and the plurality of sliding cutting teeth 5 are arranged in a matrix around the side wall of the drill bit base body 1.

[0073] In a further optimized solution, a plurality of second wedge blocks 502 are fixedly connected to the side wall of the outer shell 2, and the plurality of second wedge blocks 502 correspond to the plurality of sliding cutting teeth 5 one by one; one end of a pressure rod 501 is in contact with the side wall of the second wedge block 502, and the other end of the pressure rod 501 is fixedly connected to the sliding cutting tooth 5. The sliding cutting tooth 5 slides horizontally in a chute opened on the side wall of the drill bit base body 1. A first limiting ring 503 is sleeved on the pressure rod 501, and the first limiting ring 503 is fixedly connected to the pressure rod 501. The first limiting ring 503 is slidably arranged in the chute. The pressure rod 501 is slidably connected to a second limiting ring 505, and the second limiting ring 505 is fixedly connected in the chute. The second limiting ring 505 is sleeved on the outer side of the pressure rod 501. A second elastic part is arranged between the first limiting ring 503 and the second limiting ring 505.

[0074] In a further optimized solution, the second elastic part includes a second return spring 504. The second return spring 504 is sleeved on the outer side of the pressure rod 501. One end of the second return spring 504 abuts against the side wall of the second limiting ring 505, and the other end of the second return spring 504 abuts against the side wall of the first limiting ring 503.

[0075] Further, there is a clearance distribution between the outer side surface of the fixed sleeve 12 and the inner side surface of the drill bit base body 1. A stepped part is provided on the inner side surface of the top of the drill bit base body 1, and an annular groove is formed between the stepped part and the outer side surface of the fixed sleeve 12;

[0076] A through hole is provided on the drill bit base body 1, and the through hole communicates with the annular groove. One end of the sliding cutting tooth 5 is slidably arranged in the through hole, and the other end of the sliding cutting tooth 5 extends out of the through hole. One end of the sliding cutting tooth 5 located in the through hole is fixedly connected to the pressure rod 501. A first limiting ring 503 and a second limiting ring 505 are sleeved on the pressure rod 501. The first limiting ring 503 is fixedly connected to the pressure rod 501, and the second limiting ring 505 is fixedly connected to the inner wall surface of the through hole. A second return spring 504 is arranged between the first limiting ring 503 and the second limiting ring 505;

[0077] The outer side surface of the fixed sleeve 12 is fixedly connected with a second wedge-shaped block 502, and the second wedge-shaped block 502 is used to cooperate with the pressure rod 501 to make the sliding cutting tooth 5 perform a linear reciprocating motion.

[0078] Furthermore, a plurality of sliding cutting teeth 5 are arranged around the circumferential direction of the drill bit base body 1. In the axial direction of the drill bit base body 1, the sliding cutting teeth 5 and the second fixed cutting teeth 6 are alternately distributed.

[0079] The second wedge-shaped block 502 is located in the annular groove. A sealing ring 19 is arranged above the second wedge-shaped block 502. The sealing ring 19 is in clearance fit with the fixed sleeve 12, and the drill bit base body 1 is connected to the sealing ring 19 by bolts. The second wedge-shaped block 502 is arranged around the circumferential direction of the fixed sleeve 12. The second wedge-shaped block 502 has a structure with a arched middle part and narrowed ends. The second wedge-shaped block 502 is located on the rotation path of the pressure rod 501, and the second return spring 504 is in a compressed state, pushing the first limiting ring 503 and the pressure rod 501 to move inward.

[0080] When the sliding plug 18 drives the drill bit base body 1 to rotate, the second wedge-shaped block 502 cooperates with the pressure rod 501 to make the sliding cutting tooth 5 generate a periodic reciprocating linear motion in the radial direction of the drill bit base body 1, thereby forming a lateral periodic pulsating impact of the sliding cutting tooth 5. Cooperating with the up and down impact of the first fixed cutting tooth 8, the cutting rock-breaking efficiency can be greatly improved.

[0081] The working principle of the present utility model:

[0082] The drill bit base body 1, the outer shell 2, the hollow rod 3, the drill pipe 4, the shaft sleeve 9, the fixed ring sleeve 10, the spline shaft 11, the fixed sleeve 12, the connecting head 14, the support ring 15, the ejector rod 16, and the arc-shaped wedge-shaped block 17 are coaxially distributed.

[0083] When the drill pipe 4 rotates, the hollow rod 3, the fixed ring sleeve 10, and the fixed sleeve 12 are relatively stationary. The shaft sleeve 9 drives the spline shaft 11 to rotate, and the spline shaft 11 drives the connecting head 14, the sliding plug 18, and the end head 7 to rotate. Under the combined action of the arc-shaped wedge-shaped block 17 and the ejector rod 16, the sliding plug 18 moves up and down reciprocally, and the first fixed cutting tooth 8 moves up and down to generate a periodic pulsating impact. The second wedge-shaped block 502 cooperates with the pressure rod 501 to make the sliding cutting tooth 5 generate a lateral periodic pulsating impact.

[0084] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0085] The embodiments described above are only descriptions of the preferred embodiments of the present utility model, and do not limit the scope of the present utility model. Without departing from the design spirit of the present utility model, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present utility model shall fall within the protection scope determined by the claims of the present utility model.

Claims

1. A PDC drill bit pulsation impact device, characterized in that: include: Hollow rod (3); A housing (2) is rotatably disposed at the bottom of the hollow rod (3); A drill bit base (1) is axially connected to the bottom of the housing (2); the drill bit base (1) is a hollow structure; and a plurality of second fixed cutting teeth (6) are circumferentially arranged on the drill bit base (1); A sliding plug (18) is slidably disposed in the drill bit base (1), and the sliding plug (18) is radially limitedly matched with the drill bit base (1); A tip (7) is axially connected to the bottom of the sliding plug (18) and is located outside the drill bit base (1). A plurality of first fixed cutting teeth (8) are provided at the bottom of the tip (7); A linear reciprocating mechanism, arranged in the housing (2), drivingly connected to the sliding plug (18), and used for driving the sliding plug (18) to perform linear reciprocating motion; The rotation driving structure is in driving connection with the sliding plug (18) and is used to drive the sliding plug (18) to rotate. The rotation driving structure is arranged in the hollow rod (3).

2. A PDC drill bit pulsation impact device according to claim 1, characterized in that: The linear reciprocating mechanism comprises a plurality of arcuate wedge blocks (17), the plurality of arcuate wedge blocks (17) are fixedly connected to the top of the sliding plug (18) at equal intervals in the circumferential direction, the top surface of the arcuate wedge blocks (17) contacts the bottom end of a push rod (16), the top ends of the plurality of push rods (16) are fixedly connected to the bottom of a fixed sleeve (12), and the fixed sleeve (12) is fixedly connected to the bottom of the hollow rod (3) through a fixed ring sleeve (10); The top of the sliding plug (18) is axially connected to a connector (14), the connector (14) is vertically slidably arranged in the fixing sleeve (12), the bottom end of the fixing sleeve (12) is axially connected to a support ring (15), the support ring (15) is sleeved on the outside of the connector (14), the connector (14) is slidably connected to the support ring (15), and an elastic portion is provided between the top of the connector (14) and the support ring (15); The connecting head (14) is transmission-connected to the rotary drive structure.

3. A PDC drill bit pulsation impact device according to claim 2, characterized in that: The elastic part comprises a first return spring (13), the first return spring (13) is coaxially sleeved on the outer side of the connecting head (14), the top of the first return spring (13) abuts against the top of the connecting head (14), and the bottom of the first return spring (13) abuts against the top of the supporting ring (15).

4. A PDC drill bit pulsation impact device according to claim 2, characterized in that: The rotation driving structure comprises a drill rod (4), and the drill rod (4) is rotatably arranged in the hollow rod (3); The bottom end of the drill rod (4) is axially connected to a shaft sleeve (9), the inner wall of the shaft sleeve (9) is provided with a spline groove, the shaft sleeve (9) is matched with a spline shaft (11), and the bottom end of the spline shaft (11) is axially connected to the top end of the connector (14); The shaft sleeve (9) is rotatably arranged in the fixing sleeve (12).

5. A PDC drill bit pulsation impact device according to claim 2, characterized in that: A sealing ring (19) is axially connected to the inner side of the top of the drill bit base body (1), and the sealing ring (19) is sleeved on the outer side of the fixing sleeve (12). The fixing sleeve (12) is movably connected to the sealing ring (19).

6. A PDC drill bit pulsation impact device according to claim 1, characterized in that: The outer shell (2) is drivingly connected to a plurality of sliding cutting teeth (5), and the plurality of sliding cutting teeth (5) are arranged in a matrix around the side wall of the drill base (1).

7. A PDC drill bit pulsation impact device according to claim 6, characterized in that: The side wall of the housing (2) is fixedly connected with a plurality of second wedge blocks (502), and the plurality of second wedge blocks (502) correspond to the plurality of sliding cutting teeth (5) one by one; the side wall of the second wedge block (502) is in contact with one end of a pressure rod (501), and the other end of the pressure rod (501) is fixedly connected with the sliding cutting teeth (5), and the sliding cutting teeth (5) slide horizontally in the sliding groove provided on the side wall of the drill bit base body (1), and the outer sleeve of the pressure rod (501) is provided with a first limit Ring (503), the first limiting ring (503) is fixedly connected to the pressure rod (501), the first limiting ring (503) is slidably arranged in the sliding groove, the pressure rod (501) is slidably connected with a second limiting ring (505), the second limiting ring (505) is fixedly connected in the sliding groove, the second limiting ring (505) is sleeved on the outer side of the pressure rod (501), and a second elastic part is arranged between the first limiting ring (503) and the second limiting ring (505).

8. A PDC drill bit pulsation impact device according to claim 7, characterized in that: The second elastic part includes a second return spring (504), which is sleeved on the outside of the pressure rod (501), one end of the second return spring (504) abuts against the side wall of the second limiting ring (505), and the other end of the second return spring (504) abuts against the side wall of the first limiting ring (503).

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