Roller bit and construction method thereof

Abstract

The invention provides a roller bit and a construction method thereof. The roller bit comprises a bit body, a roller cone and a plurality of row teeth. The roller cone is connected to the bit body through a biased palm journal and can rotate relative to the bit body, and a conical tooth distribution surface is arranged on the peripheral wall of the roller cone; a plurality of row teeth are arranged on warps with different tooth surfaces of the conical cloth, and each row tooth comprise more than two teeth; in the process that a plurality of row teeth touch the ground in sequence, the centers of the roller cones generate periodic displacement in the radial direction of the roller cones so that the row teeth touching the ground generate cutting acting force in the tangential component direction and impact acting force in the radial component direction simultaneously. In the rolling operation process, multiple sets of row teeth are landed regularly in sequence, the centers of the roller cones generate large relative displacement in the radial direction of the roller cones, and the roller bit has the advantages of being high in rolling rock breaking efficiency and long in service lifeof the roller cones.

Description

technical field

[0001] The invention relates to the technical field of engineering machinery, in particular to a roller cone bit and a construction method of the upper teeth of the roller cone. Background technique

[0002] The drill bit is a rock-breaking tool used to break rocks and form a wellbore in drilling engineering; at present, the cones used in rock excavation are derived from the tooth arrangement transformation of petroleum tri-cone bits, that is, the "full teeth (no leakage rock cloth) Tooth)", its structure is as figure 1 As shown, the principle of tooth placement is "open cloth", "uniform pressure point (operation point)", and "no large rock ridges in the lip shape of the operation".

[0003] For example, Chinese patent application 201010158245.9 discloses a roller cone bit, including: a drill body with a journal portion; a tapered portion capable of rotating relative to the drill body; a support portion located between the tapered portion and the journal por...

Examples

Embodiment 1

[0062] A single roller cone bit includes a bit body 10, a roller cone 20 and multiple rows of teeth 30.

[0063] The roller cone 20 is connected to the drill body 10 through an offset palm journal 40 and is arranged to be rotatable relative to the drill body 10, wherein the angle between the axis of the palm journal 40 and the feed axis of the drill body 10 is α is 40°-60°, for example figure 2 In the case where the included angle α is 50°, when the drill bit is working, the bit body 10 rotates to drive the cone 20 to rotate around its axis, and the cone 20 will also roll around its own axis.

[0064] The cone 20 is in the shape of a truncated cone as a whole, and its generatrix is ​​an arc. A conical tooth surface 21 is formed on the outer peripheral wall of the cone 20. Multiple sets of teeth 30 are arranged on different meridians of the conical tooth surface 21. Each Each row of teeth 30 contains more than two teeth, so as to avoid the occurrence of a single tooth landing...

Embodiment 2

[0075] A combined roller cone bit, including two roller cone bits 50, a mounting base 60 and an impact device 70, wherein the structure of the roller cone bit 50 and the distribution of teeth are shown in detail in Embodiment 1, and will not be repeated here. Only to introduce the cooperative use structure of the roller cone bit 50 and the impact device 70, and in the single roller cone bit 50, the impact device 70 can still be used. For details, please refer to the following structure:

[0076] Such as Figure 6 As shown, the impact device 70 includes a movable shaft 71 , an energy storage element 72 , a balancing pressure head 73 (balance element) and a support 74 .

[0077] Two roller cone bits 50 are oppositely installed on the mounting base 60, and the bit body 10 in the roller cone bit 50 is parallel to the axis of the movable shaft 71, and the movable shaft 71 is fixedly connected with the mounting base 60, and the movable shaft 71 can expand and contract along the fee...

Embodiment 3

[0086] A method for constructing teeth on a cone, for forming the cone bit of the structure in Example 1, which includes arranging the teeth on the cone in the following manner:

[0087] Multiple sets of rows of teeth 30 are arranged along the radial line of the cone 20, and the multiple sets of rows of teeth 30 that land sequentially produce a periodic drop, and during the sequential landing of adjacent rows of teeth 30, the center of the cone 20 can generate a gap along its radial direction. The impact displacement in the direction, and the impact displacement value generated by it is above 0.6mm.

[0088] Among them, a preferred size of the gear cone is: the diameter of the cone bottom (large end) is 128mm, the diameter of the cone top (small end) is 44mm, the overall height is 80mm, and the radius of the arc-shaped generatrix is ​​145mm. The included angle between the axis of 40 and the feed axis of the drill body 10 is α and is 50°. By setting sixteen groups of rows of te...

technical field

[0001] The invention relates to the technical field of engineering machinery, in particular to a roller cone bit and a construction method of the upper teeth of the roller cone. Background technique

[0002] The drill bit is a rock-breaking tool used to break rocks and form a wellbore in drilling engineering; at present, the cones used in rock excavation are derived from the tooth arrangement transformation of petroleum tri-cone bits, that is, the "full teeth (no leakage rock cloth) Tooth)", its structure is as figure 1 As shown, the principle of tooth placement is "open cloth", "uniform pressure point (operation point)", and "no large rock ridges in the lip shape of the operation".

[0003] For example, Chinese patent application 201010158245.9 discloses a roller cone bit, including: a drill body with a journal portion; a tapered portion capable of rotating relative to the drill body; a support portion located between the tapered portion and the journal por...

Examples

Embodiment 1

[0062] A single roller cone bit includes a bit body 10, a roller cone 20 and multiple rows of teeth 30.

[0063] The roller cone 20 is connected to the drill body 10 through an offset palm journal 40 and is arranged to be rotatable relative to the drill body 10, wherein the angle between the axis of the palm journal 40 and the feed axis of the drill body 10 is α is 40°-60°, for example figure 2 In the case where the included angle α is 50°, when the drill bit is working, the bit body 10 rotates to drive the cone 20 to rotate around its axis, and the cone 20 will also roll around its own axis.

[0064] The cone 20 is in the shape of a truncated cone as a whole, and its generatrix is ​​an arc. A conical tooth surface 21 is formed on the outer peripheral wall of the cone 20. Multiple sets of teeth 30 are arranged on different meridians of the conical tooth surface 21. Each Each row of teeth 30 contains more than two teeth, so as to avoid the occurrence of a single tooth landing...

Embodiment 2

[0075] A combined roller cone bit, including two roller cone bits 50, a mounting base 60 and an impact device 70, wherein the structure of the roller cone bit 50 and the distribution of teeth are shown in detail in Embodiment 1, and will not be repeated here. Only to introduce the cooperative use structure of the roller cone bit 50 and the impact device 70, and in the single roller cone bit 50, the impact device 70 can still be used. For details, please refer to the following structure:

[0076] Such as Figure 6 As shown, the impact device 70 includes a movable shaft 71 , an energy storage element 72 , a balancing pressure head 73 (balance element) and a support 74 .

[0077] Two roller cone bits 50 are oppositely installed on the mounting base 60, and the bit body 10 in the roller cone bit 50 is parallel to the axis of the movable shaft 71, and the movable shaft 71 is fixedly connected with the mounting base 60, and the movable shaft 71 can expand and contract along the fee...

Embodiment 3

[0086] A method for constructing teeth on a cone, for forming the cone bit of the structure in Example 1, which includes arranging the teeth on the cone in the following manner:

[0087] Multiple sets of rows of teeth 30 are arranged along the radial line of the cone 20, and the multiple sets of rows of teeth 30 that land sequentially produce a periodic drop, and during the sequential landing of adjacent rows of teeth 30, the center of the cone 20 can generate a gap along its radial direction. The impact displacement in the direction, and the impact displacement value generated by it is above 0.6mm.

[0088] Among them, a preferred size of the gear cone is: the diameter of the cone bottom (large end) is 128mm, the diameter of the cone top (small end) is 44mm, the overall height is 80mm, and the radius of the arc-shaped generatrix is ​​145mm. The included angle between the axis of 40 and the feed axis of the drill body 10 is α and is 50°. By setting sixteen groups of rows of te...

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