A drilling fixture for a roller cone bit

Abstract

The present application discloses a drilling fixture for a roller bit, which is used for the drilling process of the roller bit. The drilling fixture includes a base, a drill bushing assembly disposed above the base, a turntable detachably connected to the base, the turntable rotates around the Y axis, and a clamping device disposed on the turntable. The clamping device is used to clamp the roller bit so that the axis of the roller bit is parallel to the X axis and can rotate around the X axis. The drilling fixture for the roller bit provided by the present application can complete the drilling process on a common drilling machine equipment, and has high processing efficiency.

Description

Technical Field

[0001] This application relates to the field of mining machinery and equipment. More specifically, it particularly relates to a drilling fixture for a roller bit. Background Art

[0002] Drilling is an important technical means in geological exploration work. A drill rig is used to drill downward from the surface of the earth to form a cylindrical borehole in the formation to identify and divide the strata. Core samples, ore samples, and soil samples can be obtained from different depths in the borehole for analysis and research to measure the physical and mechanical properties and indicators of rocks and soil layers and provide the required design data.

[0003] Roller bits are most widely used in oil drilling and geological drilling. When a roller bit rotates, it has the functions of impacting, crushing, and shearing the formation rock. Therefore, roller bits can adapt to various formations, including soft, medium, and hard formations. Especially after the emergence of jet roller bits and long nozzle roller bits, the drilling speed of roller bits has been greatly improved, which is a major revolution in the development history of roller bits. Roller bits can be divided into milled tooth (steel tooth) roller bits and inserted tooth (carbide teeth inserted on the roller) roller bits according to the tooth type; and can be divided into single roller bits, three-roller bits, and assembled multi-roller bits according to the number of rollers.

[0004] Among them, the roller bit breaks the rock through the impact and scraping of the teeth on the formation, and is suitable for soft-hard alternating formations with good adaptability to the formation. Alloy main cutting teeth are usually installed on the roller of the roller bit. The cutting teeth at the small end of the roller break the central area of the bottom of the well, and the cutting teeth at the large end of the roller cut the wellbore and the external area of the bottom of the well to improve the rock-breaking efficiency and service life of the roller bit. The roller bit is usually spherical, and a plurality of cutting teeth are provided on the circumference of the sphere. When processing the roller bit, multiple tooth grooves for installing the cutting teeth need to be drilled on the roller body 45 first. Since drilling is required in the circumferential direction of the roller body, the swing of two of the X / Y / Z axes is required, specifically related to the installation direction of the roller body. Ordinary three-axis machining centers can only achieve the movement of the X / Y / Z axes and cannot perform swing machining in the circumferential direction. Therefore, the drilling of the roller bit needs to be completed on a five-axis machining center. However, five-axis machining equipment belongs to high-grade precision machining instruments with less cutting amount and low cutting efficiency. Therefore, the drilling process of the roller bit cannot be completed on ordinary drilling equipment. Summary of the Invention

[0005] To solve the above technical problems, this application provides a drilling fixture for a roller bit, which can complete the drilling process on ordinary drilling equipment and has high processing efficiency.

[0006] The technical solution provided by this application is as follows:

[0007] A drilling fixture for a roller bit, used for the drilling process of a roller bit, includes a base;

[0008] A drill bushing assembly disposed above the base;

[0009] A turntable detachably connected to the base, the turntable rotating about the Y axis;

[0010] And a clamping device disposed on the turntable, the clamping device being used to clamp the roller bit so that the axis of the roller bit is parallel to the X axis and can rotate about the X axis.

[0011] Preferably, the clamping device includes a pull rod whose head is matched with the inside of the roller bit;

[0012] A tension sleeve sleeved on the outer wall of the pull rod;

[0013] A rotating shaft sleeve matched with the inner wall of one end of the tension sleeve;

[0014] An inner expansion member disposed on the pull rod, the inner expansion member abuts against the head of the pull rod, and the outer wall of the inner expansion member is matched with the inner wall of the tension sleeve;

[0015] The flange portion on the rotating shaft sleeve abuts against the end of the roller bit, and a body is sleeved on the outside of the rotating shaft sleeve, and the body is connected to the turntable.

[0016] Preferably, one end side of the body abuts against the side of the rotating shaft sleeve;

[0017] The other end side of the body abuts against an adjusting assembly, and the adjusting assembly is sleeved on the pull rod;

[0018] Through a first locking member disposed on the pull rod, so that the adjusting assembly is in close contact with the side of the body.

[0019] Preferably, the clamping device includes a pin assembly, the pin assembly includes a pin, and the pin is matched with an adjusting groove on the adjusting assembly, so as to realize that by inserting the pin into the adjusting groove and rotating the adjusting assembly, the pull rod and the roller bit are driven to rotate about the X axis.

[0020] Preferably, the adjusting assembly includes an adjusting disk, and the adjusting groove is disposed on the adjusting disk; at least two adjusting disks are provided, and each adjusting disk corresponds to adjusting the rotation angle of one cutting layer on the roller bit, and the number of adjusting grooves on the adjusting disk is equal to the number of tooth grooves on the corresponding cutting layer.

[0021] Preferably, the pin assembly includes a pin seat matched with the pin;

[0022] A spacer block matched with the pin seat, so that the pin seat can move along the X axis direction;

[0023] The cushion block is provided with a first positioning pin hole. Passing a first positioning pin through the pin seat and mating with the first positioning pin hole can position the pin seat in the X-axis direction, so as to enable the pin to be selectively inserted into any one of the adjustment discs on the adjustment assembly.

[0024] Preferably, the pin assembly includes a spring;

[0025] The spring is arranged in the inner cavity of the pin seat and sleeved on the pin, and both ends respectively abut against the two side walls of the inner cavity along both sides of the axis of the pin;

[0026] The end cross section of the pin is trapezoidal.

[0027] Preferably, the turntable is provided with evenly distributed scale lines in the circumferential direction;

[0028] The scale plate is provided with a pointer pointing to the scale line.

[0029] Preferably, the drill bushing assembly includes a first drill bushing through which a drill bit for machining tooth grooves passes along the Z-axis direction;

[0030] And a mounting seat that cooperates with the first drill bushing and slides along the Z-axis direction;

[0031] The mounting seat is provided with a second positioning pin hole, the first drill bushing is provided with a second mating hole, the second mating hole is a waist-shaped hole, and a second positioning pin passes through the second mating hole and mates with the second positioning pin hole.

[0032] Preferably, the base is provided with a chute;

[0033] The chute cooperates with a slider arranged on the mounting seat, so that the slider can slide along the X-axis direction.

[0034] In order to improve the rock-breaking efficiency and service life of the roller bit, the roller bit is usually spherical. From the large end to the small end of the roller bit, there are multiple cutting layers. Each cutting layer is provided with cutting teeth in the circumferential direction, and each cutting layer forms an angle with each other. For example, when the first cutting layer is the large end and is placed horizontally, the angle between the generatrix of the first cutting layer and the horizontal axis is 0°; the angle between the generatrix of the second cutting layer and the axis is α1, and the angle between the generatrix of the third cutting layer and the axis is α2, where α2 > α1. In this way, the angle increases continuously until the sphere becomes smaller and smaller to form the small end of the roller bit. Therefore, in order to adapt to drilling on cutting layers at different angles and to adapt to drilling within the 360° circumferential rotation range of the roller bit, the existing three-axis processing equipment (such as a drill press) cannot meet the processing requirements.

[0035] The drilling fixture for a roller bit provided by the present application is used for the drilling process of the roller bit. It includes a base, a drill bushing assembly arranged above the base, a turntable detachably connected to the base, the turntable rotates around the Y-axis, and a clamping device arranged on the turntable. The clamping device is used to clamp the roller bit so that the axis of the roller bit is parallel to the X-axis and can rotate around the X-axis. Usually, the drilling equipment moves up and down along the Z-axis to drill the roller bit. The cutting layers on the roller bit form different angles with the horizontal axis (i.e., the X-axis), for example, α1, α2. When performing the drilling process, when installing the roller bit to be drilled on the drilling fixture for the roller bit, since the clamping device is integrally installed on the turntable, rotate the turntable around the Y-axis to adjust the angle between the cutting layer and the X-axis. Since the clamping device needs to clamp the roller bit, adjust the clamping device itself to make the roller bit rotate around the X-axis, so that the roller bit can rotate within a 360° range. Therefore, the drilling fixture for the roller bit provided by the present application can complete the drilling process on a common drilling machine equipment with high processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 Structural schematic diagram of the drilling fixture for a roller bit provided by an embodiment of the present invention;

[0038] Figure 2 Structural schematic diagram of the drilling fixture for a roller bit provided by an embodiment of the present invention;

[0039] Figure 3 Top view of the drilling fixture for a roller bit provided by an embodiment of the present invention;

[0040] Figure 4 Cross-sectional view of the clamping device provided by an embodiment of the present invention;

[0041] Figure 5 Front view of the drilling fixture for a roller bit provided by an embodiment of the present invention;

[0042] Figure 6 Schematic diagram of the drilling fixture for a roller bit provided by an embodiment of the present invention rotating around the Y-axis;

[0043] Figure 7 Schematic diagram of the drilling fixture for a roller bit provided by an embodiment of the present invention rotating around the X-axis;

[0044] Figure 8 Structural schematic diagram of the slider provided by the embodiment of the present invention;

[0045] Figure 9 Structural schematic diagram of the adjusting assembly provided by the embodiment of the present invention;

[0046] Figure 10 Structural schematic diagram of the latch assembly provided by the embodiment of the present invention.

[0047] Description of reference numerals: 1, base; 11, chute; 12, slider; 2, drill bushing assembly; 21, first drill bushing; 22, mounting seat; 23, second positioning pin hole; 24, second mating hole; 3, turntable; 4, clamping device; 41, pull rod; 42, expansion sleeve; 43, rotating shaft sleeve; 44, inner expansion member; 45, body; 46, adjusting assembly; 461, adjusting disc; 4611, adjusting groove; 47, first locking member; 48, latch assembly; 481, latch; 482, latch seat; 483, spacer block; 484, first positioning pin hole; 485, spring; 5, pointer; Detailed implementation manners

[0048] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0049] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly disposed on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0050] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "first", "second", "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 this application and simplifying the description, 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 cannot be understood as a limitation to this application.

[0051] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise specifically defined.

[0052] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the implementable conditions of this application. Therefore, they do not have substantial technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that this application can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in this application.

[0053] Please as Figures 1 to 10 As shown, in order to improve the rock-breaking efficiency and service life of the roller bit, the roller bit is usually spherical. There are multiple cutting layers provided from the large end to the small end of the roller bit. Cutting teeth are provided on the circumference of each cutting layer. Each cutting layer forms an angle with each other. For example, when the first cutting layer is the large end and is placed horizontally, the angle between the generatrix of the first cutting layer and the horizontal axis is 0°; the angle between the generatrix of the second cutting layer and the axis is α1, and the angle between the generatrix of the third cutting layer and the axis is α2, where α2 > α1. In this way, the angle continuously increases until the sphere continuously becomes smaller to form the small end of the roller bit. Therefore, in order to adapt to drilling on cutting layers at different angles and to adapt to drilling within the 360° circumferential rotation range of the roller bit, existing three-axis processing equipment (such as a drill press) cannot meet the processing requirements.

[0054] The drilling fixture for a roller bit provided in this application is used for the drilling processing of a roller bit. It includes a base 1, a drill bushing assembly 2 provided above the base 1, a turntable 3 detachably connected to the base 1. The turntable 3 rotates around the Y axis, and a clamping device 4 is provided on the turntable 3. The clamping device 4 is used to clamp the roller bit so that the axis of the roller bit is parallel to the X axis and can rotate around the X axis. And the drilling equipment usually moves up and down along the Z axis to perform drilling processing on the roller bit. The cutting layers on the roller bit form different angles with the horizontal axis (i.e., the X axis). For example, α1, α2. When performing drilling processing, when the roller bit to be drilled is installed on the drilling fixture for a roller bit, since the clamping device 4 is integrally installed on the turntable 3, the turntable 3 is rotated around the Y axis to adjust the angle between the cutting layer and the X axis. Since the clamping device 4 needs to clamp the roller bit, the clamping device 4 itself is adjusted to make the roller bit rotate around the X axis, so that the roller bit rotates within the 360° rotation range. Therefore, the drilling fixture for a roller bit provided in this application can complete the drilling process on ordinary drill press equipment and has high processing efficiency.

[0055] It should be noted that the drilling fixture for the roller bit provided in this application can be used for the processing of single roller bits as provided in the embodiments, and can also be used for the processing of other various roller bits such as three-jaw roller bits. Without departing from the technical principle of the present invention, it is considered to be within the protection scope of the present invention.

[0056] Among them, the clamping device 4 includes a pull rod 41 whose head is matched with the inside of the roller bit, a tension sleeve 42 sleeved on the outer wall of the pull rod 41, a rotating shaft sleeve 43 matched with the inner wall of one end of the tension sleeve 42, an inner expansion member 44 arranged on the pull rod 41. The inner expansion member 44 abuts against the head of the pull rod 41, and the outer wall of the inner expansion member 44 is matched with the inner wall of the tension sleeve 42. The flange portion on the rotating shaft sleeve 43 abuts against the end of the roller bit, and a body 45 is sleeved on the outside of the rotating shaft sleeve 43. The body 45 is connected to the turntable 3. The roller bit is tightened by the pull rod 41, and the roller bit is tightly connected to the pull rod 41 by the tension sleeve 42 in an inner expansion manner; in addition, through the rotating shaft sleeve 43 and the tension sleeve 42, the connection between the roller bit and the rotating shaft sleeve 43 is realized, so that the positions among the roller bit, the tension sleeve 42, and the rotating shaft sleeve 43 are relatively fixed, making it not easy for the roller bit to fall off the pull rod 41. On the other hand, through the inner expansion member 44, the inner expansion member 44 abuts against the head of the pull rod 41, and the outer wall of the inner expansion member 44 is matched with the inner wall of the tension sleeve 42. Preferably, the outer wall of the inner expansion member 44 and the inner wall of the tension sleeve 42 are conical, so that the roller bit will not swing, reducing the clamping error of the roller bit. In addition, through the flange portion on the rotating shaft sleeve 43 abutting against the end of the roller bit, a body 45 is sleeved on the outside of the rotating shaft sleeve 43, and the body 45 is connected to the turntable 3, the roller bit can be easily rotated around the Y axis.

[0057] Furthermore, one end side of the body 45 abuts against the side of the rotating shaft sleeve 43, the other end side of the body 45 abuts against the adjusting assembly 46, the adjusting assembly 46 is sleeved on the pull rod 41, and through a first locking member 47 arranged on the pull rod 41, the adjusting assembly 46 is in close contact with the side of the body 45. The movement of the adjusting assembly 46 in the X-axis direction is restricted by the first locking member 47, and by rotating the adjusting assembly 46, the pull rod 41 can drive the entire roller bit to rotate around the X axis. Thus, the tooth grooves on each cutting layer of the roller bit in the circumferential direction are processed.

[0058] Among them, the clamping device 4 includes a pin assembly 48. The pin assembly 48 includes a pin 481 which is engaged with an adjustment groove 4611 on the adjustment component 46. By inserting the pin 481 into the adjustment groove 4611 and rotating the adjustment component 46, the pull rod 41 and the cone bit are driven to rotate around the X-axis. Specifically, the adjustment component 46 can be rotated through the pin assembly 48, reducing the difficulty for the operator to rotate the adjustment component 46. Preferably, the cross-section of the adjustment groove 4611 is trapezoidal, which increases the contact area between the pin 481 and the adjustment groove 4611, making it difficult for the pin 481 to fall off from the adjustment groove 4611 and increasing the reliability of adjusting the rotation angle of the adjustment component 46.

[0059] In the embodiment provided by the present invention, the adjustment component 46 includes an adjustment disk 461, and the adjustment groove 4611 is arranged on the adjustment disk 461; there are at least two adjustment disks 461, and each adjustment disk 461 corresponds to adjusting the rotation angle of a cutting layer on the cone bit. The number of adjustment grooves 4611 on the adjustment disk 461 is equal to the number of tooth grooves on the corresponding cutting layer. Using one adjustment disk 461 to correspond to adjusting one cutting layer on the cone bit, the drilling fixture provided by this embodiment can adapt to the processing of different numbers of tooth grooves on different cutting layers. For example, the number of tooth grooves on the first cutting layer is 17, and the number of adjustment grooves 4611 on the corresponding adjustment disk 461 is also set to 17; the number of tooth grooves on the second cutting layer is 12, and the number of adjustment grooves 4611 on the corresponding adjustment disk 461 is also set to 12. It can adapt to adjustments at different angles and the adjustments are fast and accurate.

[0060] Among them, the pin assembly 48 includes a pin seat 482 that cooperates with the pin 481, and a spacer block 483 that cooperates with the pin seat 482, so that the pin seat 482 can move along the X-axis direction. The spacer block 483 is provided with a first positioning pin hole 484. By passing a first positioning pin through the pin seat 482 and engaging it with the first positioning pin hole 484, the pin seat 482 can be positioned in the X-axis direction, so that the pin 481 can be selectively inserted into any one of the adjustment disks 461 on the adjustment component. Through this structural setting, on the one hand, the position of the pin 481 along the X-axis direction can be adjusted; on the other hand, through the cooperation of the first positioning pin and the first positioning pin hole 484, the center line of the pin 481 is always located on the center line. When the first tooth groove is drilled downward through the drill bushing assembly 2, it is always perpendicular. After that, the rotation angle of the adjustment disk 461 is equal to the interval angle between the tooth grooves on the cone bit. Furthermore, it is ensured that all the tooth grooves on the same cutting layer are machined along the Z-axis, improving the perpendicularity of the tooth groove machining.

[0061] Further, the latch assembly 48 includes a spring 485. The spring 485 is disposed in the inner cavity of the latch seat 482 and sleeved on the latch 481. The two ends of the spring 485 respectively abut against the two side walls of the inner cavity along the axial direction of the latch 481. The end cross-section of the latch 481 is trapezoidal. In this way, when the latch 481 is inserted into or disengaged from the adjustment groove 4611, the spring 485 in the inner cavity will be compressed or elongated. When the latch 481 disengages from the adjustment groove 4611, the spring 485 is compressed. When the adjustment disk 461 is rotated to a preset position, the end of the latch 481 is aligned with the adjustment groove 4611. When the latch 481 is inserted into the adjustment groove 4611, the compression energy stored when the spring 485 is compressed always pushes the latch 481 to move along the axis of the latch 481 towards the adjustment groove 4611. The cross-section of the adjustment groove 4611 is also trapezoidal, and this compression energy can always tightly insert the latch 481 into the adjustment groove 4611. If the adjustment disk 461 needs to be rotated again, this compression energy needs to be overcome. Due to the relatively large self-weight of the roller bit and the relatively small cutting impact energy during drilling, considering these three factors comprehensively, during drilling, without external force, the latch 481 cannot break free from the adjustment groove 4611 by itself.

[0062] In the embodiment provided by the present invention, evenly distributed scale lines are provided on the circumferential direction of the turntable 3, and a pointer 5 pointing to the scale lines is provided on the scale disk. All these are for making the angle adjustment of the roller bit rotating around the Y-axis more accurate.

[0063] In the embodiment provided by the present invention, the drill bushing assembly 2 includes a first drill bushing 21 through which the drill bit for machining the tooth groove passes along the Z-axis direction, and a mounting seat 22 that cooperates with the first drill bushing 21 and slides along the Z-axis direction. A second positioning pin hole 23 is provided on the mounting seat 22, and a second mating hole 24 is provided on the first drill bushing 21. The second mating hole 24 is a waist-shaped hole. The second positioning pin passes through the second mating hole 24 and cooperates with the second positioning pin hole 23. When the roller bit rotates around the Y-axis, the position of the outer edge of the roller bit in the Z-axis direction will change. In order to avoid interference between the outer edge of the roller bit and the first drill bushing 21, the second positioning pin hole 23, the second mating hole 24 and the shape of the second mating hole 24, and the mutual cooperation relationship among them are all for realizing the adjustment of the displacement of the first drill bushing 21 in the Z-axis direction, so that when the roller bit rotates around the Y-axis direction, the outer edge of the roller bit cannot interfere with the first drill bushing 21.

[0064] Wherein, a chute 11 is provided on the base 1, and the chute 11 cooperates with a slider 12 provided on the mounting seat 22, so that the slider 12 can slide along the X-axis direction. Through this structural setting, the movement of the first drill bushing 21 in the X-axis direction can be realized, so that the first drill bushing 21 can adapt to the machining of tooth grooves on different cutting layers.

[0065] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drilling fixture for a roller cone bit, used for the drilling process of the roller cone bit, characterized in that, Comprising a base (1); A drill bushing assembly (2) provided above the base (1); A turntable (3) detachably connected to the base (1), the turntable (3) rotating about the Y-axis; And a clamping device (4) provided on the turntable (3), the clamping device (4) being used to clamp the cone bit such that the axis of the cone bit is parallel to the X-axis and can rotate about the X-axis; The clamping device (4) includes a pull rod (41) whose head is fitted to the inside of the cone bit; A tension sleeve (42) sleeved on the outer wall of the pull rod (41); A rotating shaft sleeve (43) fitted to the inner wall of one end of the tension sleeve (42); An inner expansion member (44) provided on the pull rod (41), the inner expansion member (44) abutting against the head of the pull rod (41), and the outer wall of the inner expansion member (44) being fitted to the inner wall of the tension sleeve (42); The flange portion on the rotating shaft sleeve (43) abuts against the end of the cone bit, and a body (45) is sleeved on the outside of the rotating shaft sleeve (43), and the body (45) is connected to the turntable (3); One end side portion of the body (45) abuts against the side portion of the rotating shaft sleeve (43); The other end side portion of the body (45) abuts against an adjustment assembly (46), and the adjustment assembly (46) is sleeved on the pull rod (41); Through a first locking member (47) provided on the pull rod (41), such that the adjustment assembly (46) is in close contact with the side portion of the body (45); The clamping device (4) includes a pin assembly (48), the pin assembly (48) includes a pin (481), and the pin (481) is fitted to an adjustment groove (4611) on the adjustment assembly (46), so as to realize that by inserting the pin (481) into the adjustment groove (4611) and rotating the adjustment assembly (46), the pull rod (41) and the cone bit are driven to rotate about the X-axis.

2. The drilling fixture for a roller cone bit according to claim 1, characterized in that, The adjustment assembly (46) includes an adjustment disk (461), and the adjustment groove (4611) is provided on the adjustment disk (461); At least two adjustment disks (461) are provided, and each adjustment disk (461) correspondingly adjusts the rotation angle of one cutting layer on the cone bit, and the number of adjustment grooves (4611) on the adjustment disk (461) is equal to the number of tooth grooves on the corresponding cutting layer.

3. The drilling fixture for a roller cone bit according to claim 2, wherein, The pin assembly (48) includes a pin seat (482) fitted to the pin (481); A spacer block (483) fitted to the pin seat (482), such that the pin seat (482) can move along the X-axis direction; A first positioning pin hole (484) is provided on the spacer block (483), and by passing a first positioning pin through the pin seat (482) and fitting it with the first positioning pin hole (484), the pin seat (482) can be positioned in the X-axis direction, so as to realize that the pin (481) can be selectively inserted into any one of the adjustment disks (461) on the adjustment assembly (46).

4. The drilling fixture for a roller bit according to claim 3, characterized in that, The pin assembly (48) includes a spring (485); The spring (485) is arranged in the inner cavity of the latch seat (482), sleeved on the latch (481), and the two ends respectively abut against the two side walls of the inner cavity along both sides in the axial direction of the latch (481); The end cross-section of the latch (481) is trapezoidal.

5. The drilling fixture for a roller cone bit according to claim 1, characterized in that, The turntable (3) is provided with evenly distributed scale lines in the circumferential direction; The turntable (3) is provided with a pointer (5) pointing to the scale lines.

6. The drilling fixture for a roller bit according to claim 1, characterized in that, The drill bushing assembly (2) includes a first drill bushing (21) through which a drill bit for machining a tooth groove passes along the Z-axis direction; And a mounting seat (22) that cooperates with the first drill bushing (21) and slides along the Z-axis direction; The mounting seat (22) is provided with a second positioning pin hole (23), the first drill bushing (21) is provided with a second mating hole (24), the second mating hole (24) is an oblong hole, and a second positioning pin passes through the second mating hole (24) and cooperates with the second positioning pin hole (23).

7. The drilling fixture for a roller cone bit according to claim 6, characterized in that, The base (1) is provided with a chute (11); The chute (11) cooperates with a slider (12) provided on the mounting seat (22) so that the slider (12) can slide along the X-axis direction.

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