Rock breaking drill bit of positive circulation drilling machine and special hobbing cutter of rock breaking drill bit

Abstract

The utility model discloses a rock breaking drill bit of a positive circulation drilling machine and a special hob for the rock breaking drill bit. The special hob comprises a pivot and a hob piece. The hobbing cutter piece comprises a hobbing cutter seat and a lug boss arranged on the outer side wall of the hobbing cutter seat; the hob seat is a rotary body and is rotatably mounted on the pivot in a sleeving manner; the diameter of the hob seat is gradually reduced in the direction from one end of the pivot to the other end of the pivot, and the convex part comprises a plurality of convex rings which are distributed at intervals; the protruding ring comprises a plurality of protruding pieces evenly distributed in the circumferential direction of the hob piece. The rock breaking drill bit comprises the special clamp and the special hob, so that the special hob can be conveniently mounted and replaced, and the practicability and maintainability of the drill bit are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of municipal engineering, and in particular relates to a rock-breaking drill bit for a positive circulation drilling rig and a special roller cutter thereof. Background Art

[0002] A roller drill bit, commonly known as a roller drill or a roller bit, is a type of drilling equipment primarily used in oil, gas, and geological exploration. It consists of a central tube and multiple rotating cones, each equipped with carbide or steel teeth. As the drill bit rotates, these teeth break up the rock, creating a hole.

[0003] However, the rock breaking efficiency of existing roller drill bits is not high. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a positive circulation drilling rig rock breaking drill bit and its dedicated roller cutter, which can solve at least part of the above technical problems.

[0005] A first aspect of the embodiments of the present disclosure provides a special roller cutter for a rock breaking drill bit of a positive circulation drilling rig, the special roller cutter comprising:

[0006] pivot;

[0007] The hob cutter assembly includes a hob cutter seat and a raised portion arranged on the outer side wall of the hob cutter seat; the hob cutter seat is a rotating body and is rotatably mounted on the pivot; and the diameter of the hob cutter seat gradually decreases along the direction from one end of the pivot to the other end, and the raised portion includes a plurality of raised rings distributed at intervals; the raised ring includes a plurality of raised members evenly distributed along the circumferential direction of the hob cutter assembly.

[0008] Optionally, the number of raised elements in the plurality of raised rings is the same.

[0009] Optionally, the plurality of raised rings are evenly distributed along the hob seat.

[0010] Optionally, a center line connecting two adjacent raised members in two adjacent raised rings is coplanar with a central axis of the hob member.

[0011] Optionally, the plurality of raised rings include a first raised ring distributed on one side edge of the hob cutter element and / or a second raised ring distributed on the other side edge of the hob cutter element.

[0012] Optionally, the protrusion is a hemisphere.

[0013] Optionally, the dedicated hob further includes a bearing, which is sleeved on the pivot and located between the pivot and the hob member, so that the hob member can rotate around the pivot.

[0014] The main technical effects achieved by the disclosed embodiments are as follows: the cutter housing's design, with its diameter gradually decreasing along the pivot axis, helps reduce resistance to the cutter during drilling, enabling the cutter to penetrate the rock more deeply while reducing energy loss. The raised portions on the cutter housing's outer wall, particularly the raised rings, provide multiple contact points for the cutter. These raised rings are evenly distributed along the cutter's circumference, helping to achieve more even force distribution during drilling, reducing localized wear and extending the cutter's service life. The spaced-apart design ensures the cutter can continuously apply crushing force to the rock during rotation, while avoiding localized stress concentration caused by excessively concentrated raised rings, thereby improving the cutter's durability.

[0015] A second aspect of the disclosed embodiments provides a positive circulation drilling rig rock breaking drill bit, which includes a special fixture and a special roller cutter for a positive circulation drilling rig rock breaking drill bit as described above; the special roller cutter is installed on the special fixture.

[0016] Optionally, the pivot includes a rotating portion and two mounting portions located on both sides of the rotating portion; the two mounting portions are respectively fixedly connected to the clamp.

[0017] Optionally, the special fixture is provided with two steps; the two steps are respectively located on the left and right sides of the special fixture; the mounting portion is a rectangular block adapted to the steps and is fixed to the steps by bolts.

[0018] The main technical effect achieved by the embodiment of the present disclosure is that the rock-breaking drill bit includes a special fixture and a roller cutter. This design allows the roller cutter to be easily installed and replaced, thereby improving the practicality and maintainability of the drill bit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a special fixture for a rock-breaking drill bit of a positive circulation drilling rig according to an embodiment of the present disclosure;

[0020] Figure 2 Schematic diagram of the structure of a special roller cutter for a rock-breaking drill bit of a positive circulation drilling rig according to an embodiment of the present disclosure.

[0021] Explanation of the accompanying drawings: 10. Clamp body; 11. Left clamp arm; 12. Right clamp arm; 13. Left step; 14. Right step; 15. First transition portion; 16. Reinforcement portion; 17. Left mounting hole; 18. Right mounting hole; 20. Pivot; 21. Hob seat; 22. Raised portion; 220. First raised ring; 221. Second raised ring. DETAILED DESCRIPTION

[0022] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0023] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. Unless otherwise defined, the technical or scientific terms used in this disclosure should have the ordinary meaning understood by a person of ordinary skill in the art to which this disclosure belongs. The words "first," "second," and similar terms used in this disclosure and the claims do not indicate any order, quantity, or importance, but are simply used to distinguish different components. Similarly, words such as "a" or "an" do not indicate a quantitative limitation, but rather indicate the presence of at least one. If only "one" is referred to, it will be separately stated. "Multiple" or "several" means two or more. Unless otherwise specified, words such as "front," "rear," "lower," and / or "upper" are for ease of description only and are not limited to a single position or spatial orientation. Words such as "include" or "comprises" mean that the elements or objects listed before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, but can also include electrical connections, whether direct or indirect. As used in this disclosure and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0024] A rock breaking drill bit for a positive circulation drilling rig, comprising: Figure 1 The special fixture shown and Figure 2 Special reel shown.

[0025] Continue to refer Figure 1The special clamp includes a clamp body 10, a left clamp arm 11, and a right clamp arm 12. The left clamp arm 11 is arranged on the left side of the clamp body 10 and has a left step 13 for mounting a special roller cutter. The left step 13 is located at the top of the front side of the left clamp arm 11; the right clamp arm 12 is arranged on the right side of the clamp body 10 and has a right step 14 for mounting a special roller cutter. The right step 14 is located at the top of the front side of the right clamp arm 12; wherein the clamp body 10, the left clamp arm 11, and the right clamp arm 12 cooperate to form a receiving slot for accommodating the special roller cutter.

[0026] The left and right clamping arms 11, 12 are symmetrically positioned on either side of the fixture body 10. This arrangement helps achieve force balance and reduces structural deformation or damage caused by asymmetrical forces. A left step 13 and a right step 14 are located at the top of the front sides of the left and right clamping arms 11, 12, respectively, providing a mounting platform for the specialized hob. The step design ensures a stable mounting of the hob on the fixture, while the height and position of the steps can be adjusted to accommodate hobs of varying sizes. The fixture body 10, the left and right clamping arms 11, 12 form a receiving slot for the specialized hob. The design of the receiving groove ensures the positioning accuracy of the roller cutter during the drilling process, while providing sufficient space to accommodate the rotating part of the roller cutter, reducing the friction and wear between the roller cutter and the clamp; the combined design of the clamp body 10, the left clamp arm 11 and the right clamp arm 12 provides a stable frame that can withstand the axial force and lateral force generated during the drilling process, ensuring the stability of the drill bit under complex geological conditions; since the clamp is designed with specific installation steps, the installation and disassembly of the roller cutter becomes more convenient, which helps to improve the maintenance efficiency of the drill bit and reduce maintenance costs.

[0027] As an optional embodiment, the left clamp arm 11 is provided with a plurality of left mounting holes 17 extending in the front-to-back direction; the left mounting holes 17 are located on the vertical step surface of the left step 13. The right clamp arm 12 is provided with a plurality of right mounting holes 18 extending in the front-to-back direction; the right mounting holes 18 are located on the vertical step surface of the right step 14. The left mounting holes 17 on the left clamp arm 11 extend in the front-to-back direction, providing multiple mounting points, which increases the flexibility of installation and allows the position of the hob to be adjusted as needed. At the same time, multiple mounting points help to disperse the force applied by the hob, reduce local stress concentration, and improve structural strength. Similar to the left clamp arm 11, the right mounting hole 18 on the right clamp arm 12 also extends in the front-to-back direction, providing multiple mounting points, which also helps to improve the stability and strength of the structure.

[0028] As an optional embodiment, the thickness of the left clamp arm 11 in the left-right direction is a, and the width of the left clamp arm 11 in the front-to-back direction is b, wherein b is greater than or equal to 2a; the thickness of the right clamp arm 12 in the left-right direction is c, and the width of the right clamp arm 12 in the front-to-back direction is d, wherein d is greater than or equal to 2c; the width b of the left clamp arm 11 in the front-to-back direction is greater than or equal to twice the thickness a in the left-to-right direction. This design increases the bending resistance of the left clamp arm 11 and improves its ability to resist deformation during drilling, thereby enhancing the strength of the overall structure; the size ratio of the right clamp arm 12 is similar to that of the left clamp arm 11, and the width d is greater than or equal to twice the thickness c, which also enhances the bending resistance and structural strength of the right clamp arm 12.

[0029] As an optional embodiment, the specialized clamp further includes two arc-shaped first transition portions 15; the two transition portions are respectively connected between the left clamp arm 11 and the clamp body 10, and between the right clamp arm 12 and the clamp body 10. The two arc-shaped first transition portions 15 connecting the left clamp arm 11 and the clamp body 10, and the right clamp arm 12 and the clamp body 10, respectively, facilitate smooth force transmission and reduce stress concentration points. The arc-shaped transition portions also provide better bending and torsional resistance, enhancing the stability and strength of the overall structure.

[0030] As an optional embodiment, the clamp body 10 is V-shaped. The V-shaped structure of the clamp body 10 helps to concentrate the force on the central area of ​​the dedicated hob, which can improve the penetration force of the drill bit. At the same time, the V-shaped structure also helps to improve the stability and load-bearing capacity of the overall structure.

[0031] As an optional embodiment, the specialized clamp further includes a reinforcement portion 16, which extends left and right and is disposed on the upper wall of the clamp body 10. The reinforcement portion 16 on the upper wall of the clamp body 10 extends left and right, providing additional support. This design can improve the rigidity and bending resistance of the clamp body 10, especially when subjected to high drilling forces. The reinforcement portion 16 can effectively prevent deformation of the clamp body 10, thereby improving the strength of the overall structure.

[0032] Continue to refer Figure 2 , the special hob includes a pivot 20 and a hob member.

[0033] The pivot 20 consists of a rotating portion and two mounting portions located on either side of the rotating portion. The mounting portions are fixedly connected to the left step 13 and right step 14 of the dedicated fixture, respectively. Specifically, a number of fastening bolts pass through the left mounting hole 17 and the right mounting hole 18, and then threadedly connect to the two mounting portions. This design facilitates the installation and replacement of the dedicated hob, improving the practicality and maintainability of the drill bit.

[0034] The cutter assembly includes a cutter seat 21 and a raised portion 22 disposed on the outer wall of the cutter seat 21. The cutter seat 21 is a rotating body that is rotatably mounted on the pivot 20. The diameter of the cutter seat 21 gradually decreases from one end of the pivot 20 to the other end. The raised portion 22 includes multiple spaced raised rings, each evenly distributed along the circumference of the cutter assembly. The gradually decreasing diameter of the cutter seat 21 along the pivot 20 helps reduce resistance during drilling, allowing the cutter to penetrate deeper into the rock while reducing energy loss. The raised portion 22 on the outer wall of the cutter seat 21, particularly the raised ring, provides multiple contact points for the cutter. These raised rings are evenly distributed along the circumference of the cutter, which helps to achieve more uniform force distribution during drilling, reduce local wear and extend the service life of the cutter. The design of the spaced distribution of the raised rings ensures that the cutter can continuously apply crushing force to the rock during rotation, while avoiding local stress concentration caused by excessive concentration of raised rings, thereby improving the durability of the cutter.

[0035] As an optional embodiment, the number of raised elements in the plurality of raised rings is the same. Ensuring that the number of raised elements in each raised ring is the same helps maintain the balance and consistency of the cutter and improves stability during drilling.

[0036] As an optional embodiment, a plurality of raised rings are evenly distributed along the cutter seat 21. The raised rings are evenly distributed along the cutter seat 21, which can ensure that the cutter exerts uniform force on the rock when rotating, thereby improving rock breaking efficiency.

[0037] As an optional embodiment, the center line connecting two adjacent raised members in two adjacent raised circles is coplanar with the central axis of the hob. This helps the hob maintain symmetry and balance during rotation, reducing wear caused by asymmetry.

[0038] As an optional embodiment, the plurality of raised rings include a first raised ring 220 distributed on one edge of the cutter element and / or a second raised ring 221 distributed on the opposite edge of the cutter element. The raised rings can be located on one side or the opposite side of the cutter element. This design can adjust the rock breaking direction and force of the cutter according to actual needs.

[0039] As an optional embodiment, the protrusion is a hemisphere. The protrusion is designed as a hemisphere. This shape helps to better break rocks during drilling and reduces wear.

[0040] As an optional embodiment, the dedicated cutter hob further includes a bearing, which is sleeved on the pivot 20 and located between the pivot 20 and the cutter element, so that the cutter element can rotate about the pivot 20. The provision of the bearing enables the cutter element to rotate about the pivot 20, thereby improving the flexibility and durability of the cutter hob and reducing friction.

[0041] The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. A special roller cutter for a rock breaking drill bit of a positive circulation drilling rig, characterized in that: The special hob includes: pivot; A hob cutter assembly includes a hob cutter seat and a raised portion provided on an outer side wall of the hob cutter seat; the hob cutter seat is a rotating body and is rotatably mounted on the pivot; the diameter of the hob cutter seat gradually decreases along a direction from one end of the pivot to the other end; the raised portion includes a plurality of raised rings distributed at intervals; the raised ring includes a plurality of raised members evenly distributed along the circumferential direction of the hob cutter assembly; The number of raised elements in the plurality of raised circles is consistent; The plurality of raised rings are evenly distributed along the hob seat; A center line connecting two adjacent raised members in two adjacent raised rings is coplanar with a central axis of the hob member.

2. The special roller cutter for rock breaking drill bit of positive circulation drilling rig according to claim 1, characterized in that: The plurality of raised circles include a first raised circle distributed on one side edge of the hob cutter element and / or a second raised circle distributed on the other side edge of the hob cutter element.

3. The special roller cutter for rock breaking drill bit of positive circulation drilling rig according to claim 1, characterized in that: The protruding piece is a hemispherical body.

4. The special roller cutter for rock breaking drill bit of positive circulation drilling rig according to claim 1, characterized in that: The special roller cutter further comprises a bearing, which is sleeved on the pivot and located between the pivot and the roller cutter element, so that the roller cutter element can rotate around the pivot.

5. A rock breaking drill bit for a positive circulation drilling rig, characterized in that: The rock-breaking drill bit comprises a special fixture and a special roller cutter for a positive circulation drilling rig rock-breaking drill bit according to any one of claims 1 to 4; the special roller cutter is installed on the special fixture.

6. The rock breaking drill bit for a positive circulation drilling rig according to claim 5, characterized in that: The pivot includes a rotating portion and two mounting portions respectively located on both sides of the rotating portion; the two mounting portions are respectively fixedly connected to the clamp.

7. The rock breaking drill bit for a positive circulation drilling rig according to claim 6, characterized in that: The special fixture is provided with two steps; the two steps are respectively located on the left and right sides of the special fixture; the mounting portion is a rectangular block adapted to the steps and is fixed to the steps by bolts.

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