CN210033292U - Bottomless type two-bucket rotary drilling bit - Google Patents
Bottomless type two-bucket rotary drilling bit Download PDFInfo
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- CN210033292U CN210033292U CN201920619082.6U CN201920619082U CN210033292U CN 210033292 U CN210033292 U CN 210033292U CN 201920619082 U CN201920619082 U CN 201920619082U CN 210033292 U CN210033292 U CN 210033292U
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Abstract
The utility model relates to a two lamella fill of bottomless formula are dug drill bit soon. This drill bit, including the square head, the square head lower extreme is provided with two lamella formula barrels through two connecting pin symmetries, and two barrel inner walls of two lamella formula barrels all are equipped with the breather pipe, and breather pipe upper end opening is located the stack shell lateral wall, and the lower extreme is equipped with the apron. The cover plate is arranged at the lower end of the vent pipe through a spring and a pin shaft. The spring is compressed during normal drilling, and the cover plate is closed; in the drill lifting process, annular mud enters the vent pipe from the upper opening of the vent pipe, and the lower cover plate is forced to be opened under the action of the pressure of the mud liquid column, so that the mud enters the lower part of the drill bit, and a vacuum negative pressure area is prevented from being generated below the drill bit in the drill lifting process. The utility model discloses can improve and creep into efficiency and arrange sediment efficiency, the closely knit effect of extrusion to the hole wall soil body can be realized to slope formula gage block to adopt ventilation structure to reduce the possibility that produces vacuum negative pressure effect in the drill bit below when carrying the brill.
Description
Technical Field
The utility model relates to a drill bit especially relates to a two lamella fill of bottomless formula dig drill bit soon.
Background
With the rapid development of national economy, China has huge market demands in the construction field of the industries such as traffic, electric power and municipal engineering, and the construction of environment-friendly pile foundation engineering by adopting a rotary drilling rig becomes an unprecedented construction technology. In the actual rotary drilling and pore forming process, the local soil filling layer, the sand layer, the gravel layer and the like are seriously expanded or collapsed, the pore-forming quality is low, the concrete filling coefficient is overlarge, and the engineering benefit is seriously influenced.
In order to reduce the concrete filling coefficient of the rotary drilling bored concrete pile, the slurry performance, the construction process and the rotary drilling bit can be adjusted and improved. In the aspect of rotary drilling of the drill bit, the drill bit is various, and common drill bit types comprise a sand scooping hopper, a two-petal hopper, a cylindrical drill, an auger bit and the like. When the type of the drill bit is not suitable for the drilled stratum, the drilling efficiency is low, the probability of scraping the hole wall by the drill bit is increased, and the phenomena of hole wall collapse and pile hole diameter expansion are caused. Because the annular flow area between the drill bit and the hole wall is too small, the drill bit is easy to form a piston effect in the drill lifting process, so that a vacuum negative pressure area is generated at the bottom of the hole, and the hole wall collapses. The phenomenon is particularly obvious when a stratum with high clay content is drilled, and the clay wrapped on the surface of the drill bit further reduces the annular flow area.
Disclosure of Invention
For solving the above problem, the utility model provides a dig bored concrete pile soon and creep into with two lamella fill of bottomless formula and dig the drill bit soon, adopt this drill bit when the viscidity stratum creeps into, can improve the drilling efficiency of drill bit to avoid carrying the in-process and produce vacuum negative pressure zone bottom the drill bit.
The utility model adopts the technical proposal that: the utility model provides a two lamella fill rotary excavating bit of bottomless formula which characterized in that: the rotary drilling rig comprises a square head connected with the lower end of a drill rod of a rotary drilling rig, wherein two petal type cylinders are symmetrically arranged at the lower end of the square head through two connecting pins, two petal type welding cylinders are fixedly arranged at the lower ends of the two petal type cylinders, cutting teeth are arranged at the lower ends of the two petal type welding cylinders, the two petal type cylinders are closed under normal conditions, and the two petal type cylinders can be opened at a certain angle when slag is removed. Two barrel inner walls of two lamella formula barrels all are equipped with the breather pipe, breather pipe upper end opening is located the stack shell lateral wall, and the lower extreme is equipped with the apron.
Preferably, the cover plate is arranged at the lower end of the vent pipe through a spring and a pin shaft. The spring is compressed during normal drilling, and the cover plate is closed; in the drill lifting process, annular mud enters the vent pipe from the upper opening of the vent pipe, and the lower cover plate is forced to be opened under the action of the pressure of the mud liquid column, so that the mud enters the lower part of the drill bit, and a vacuum negative pressure area is prevented from being generated below the drill bit in the drill lifting process.
Furthermore, the breather pipe is enclosed by trapezoidal frid and two lamella formula barrel lateral walls and closes and form. The cross-sectional area of the vent pipe is larger, so that the flow area of the vent pipe is increased.
Preferably, the outer side walls of the two-petal-type cylinder body and the two-petal-type welding cylinder body are both provided with gauge blocks.
Furthermore, the gauge protection block adopts a slope type structure and forms a certain included angle with the vertical axis of the cylinder body, and the purpose is to press large pebble gravels protruding from the hole wall into the hole wall in the drilling process, so that the hole wall is more compact and stable.
Preferably, the lower end of the two-petal welding cylinder is provided with a circular arc-shaped water gap. The space for the flowing of the slurry inside and outside the drill bit is strengthened.
Preferably, the cutting teeth are staggered, and drilling efficiency is improved.
The utility model discloses the beneficial effect who gains is: two barrel inner walls of two lamella formula barrels all are equipped with the breather pipe, and breather pipe upper end opening is located the stack shell lateral wall, and the lower extreme is equipped with the apron. The cover plate is arranged at the lower end of the vent pipe through a spring and a pin shaft. The spring is compressed during normal drilling, and the cover plate is closed; in the drill lifting process, annular mud enters the vent pipe from the upper opening of the vent pipe, and the lower cover plate is forced to be opened under the action of the pressure of the mud liquid column, so that the mud enters the lower part of the drill bit, and a vacuum negative pressure area is prevented from being generated below the drill bit in the drill lifting process. The utility model discloses can improve and creep into efficiency and arrange sediment efficiency, the closely knit effect of extrusion to the hole wall soil body can be realized to slope formula gage block to adopt ventilation structure to reduce the possibility that produces vacuum negative pressure effect in the drill bit below when carrying the brill.
Drawings
Fig. 1 is a schematic structural view of the present invention;
reference numerals: 1. a square head; 2. a two-petal cylinder; 3. a two-lobe welding cylinder; 4. a connecting pin; 5. gauge protection block 6, vent pipe; 7. an opening; 8. a cover plate; 9. cutting teeth; 10. circular arc mouth of a river.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model discloses a drill bit is dug soon to two lamellas of bottomless formula fill, including square head 1, two lamella formula barrels 2, two lamella formula welding section of thick bamboos 3, connect and connect round pin 4 and cutting teeth 6, square head 1 is used for will digging the drill bit soon and dig the drilling rod of rig soon and connect, and connecting pin 4 is used for connecting square head 1 and two lamella formula barrels 2, owing to this dig the drill bit soon and be two lamella formulas, has adopted 2 connecting pin 4, corresponds with two lamella barrels respectively, and two lamella formula barrels 2 can be followed connecting pin 4 and rotated to the realization is opened and is foldd. The lower extreme welding of two lamella formula barrels 2 has two lamella formula welding section of thick bamboo 3 that thickness is bigger, and two lamella formula welding section of thick bamboo 3 lower extreme is equipped with cutting teeth 9, and two lamella barrels 2 are closed under normal condition, and two lamella formula barrels 2 can open certain angle when the scarfing cinder.
The inner walls of the two petal-type cylinders 3 are provided with ventilation structures, the ventilation structures comprise ventilation pipes 6, and the two petal-type cylinders 2 are respectively provided with a ventilation structure and are symmetrically distributed; an opening 7 at the upper end of the vent pipe 6 is positioned on the outer side wall of the two-petal cylinder 2, so that the vent pipe is prevented from being blocked by dregs falling from the wall of the hole; the vent pipe 6 is formed by enclosing a ladder-shaped groove plate and the side walls of the two-petal cylinder body 2, and the sectional area is larger, so that the flow area of the vent pipe 6 is increased; the lower end closing device of the vent pipe 6 is a cover plate 8, and the cover plate 8 is arranged at the lower end of the vent pipe 6 through a spring and a pin shaft. The spring is compressed during normal drilling, and the cover plate 8 is closed; in the process of lifting the drill, annular mud enters the vent pipe 6 from the upper end opening 7, and the lower end cover plate 8 is forced to be opened under the action of the pressure of the mud liquid column, so that the mud is forced to enter the lower part of the drill bit, and a vacuum negative pressure area is prevented from being generated below the drill bit in the process of lifting the drill.
Slope type gauge protection blocks 5 are uniformly arranged on the upper ends of the outer walls of the two-petal type cylinder body 2 and the outer wall of the two-petal type welding cylinder 3, and the extrusion compaction effect on a hole wall soil body can be realized. The height, inclination and number of the ramped gage blocks 5 may vary depending on the bit diameter and formation changes.
The lower end of the two-petal welding cylinder 3 is provided with detachable cutting teeth 6, and the cutting teeth 6 are staggered on the two-petal welding cylinder 3 (namely the cutting teeth 6 are on different circular cross sections), thereby improving the drilling efficiency of the drill bit.
The lower end of the two-petal welding cylinder 3 is provided with an arc-shaped water gap 10 at a position close to the closing of the two-petal welding cylinder 3, the arc-shaped water gap 10 can reduce the stress concentration phenomenon at the position of the water gap in the drilling process, and the abnormal damage of a drill bit is avoided; meanwhile, the circular arc-shaped water gap 10 can also increase the effective flow area of fluid inside and outside the drill bit.
The foregoing shows and describes the general principles and principal structural features of the invention. The present invention is not limited by the above-mentioned examples, and the present invention can be modified in various ways without departing from the spirit and scope of the present invention, and these modifications and improvements fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a two lamella fill rotary excavating bit of bottomless formula which characterized in that: the drilling machine drilling rod cutting device comprises a square head (1) connected with the lower end of a drilling rod of a rotary drilling rig, wherein two petal type cylinders (2) are symmetrically arranged at the lower end of the square head (1) through two connecting pins (4), two petal type welding cylinders (3) are fixedly arranged at the lower ends of the two petal type cylinders (2), and cutting teeth (9) are arranged at the lower ends of the two petal type welding cylinders (3); two barrel inner walls of two lamella formula barrels (2) all are equipped with breather pipe (6), breather pipe (6) upper end opening (7) are located the stack shell lateral wall, and the lower extreme is equipped with apron (8).
2. The bottomless two-bucket rotary drilling bit according to claim 1, characterized in that: the cover plate (8) is arranged at the lower end of the vent pipe (6) through a spring and a pin shaft.
3. The bottomless two-bucket rotary drilling bit according to claim 1 or 2, characterized in that: the vent pipe (6) is formed by enclosing a trapezoidal groove plate and two petal type cylinder side walls.
4. The bottomless two-bucket rotary drilling bit according to claim 1, characterized in that: and the outer side walls of the two-petal-type cylinder body (2) and the two-petal-type welding cylinder (3) are respectively provided with a gauge protection block (5).
5. The bottomless two-bucket rotary drilling bit according to claim 4, characterized in that: the gauge block (5) adopts a slope type structure.
6. The bottomless two-bucket rotary drilling bit according to claim 1, characterized in that: the lower end of the two-petal welding cylinder (3) is provided with a circular arc water gap (10).
7. The bottomless two-bucket rotary drilling bit according to claim 1, characterized in that: the cutting teeth (9) are staggered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920619082.6U CN210033292U (en) | 2019-04-30 | 2019-04-30 | Bottomless type two-bucket rotary drilling bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920619082.6U CN210033292U (en) | 2019-04-30 | 2019-04-30 | Bottomless type two-bucket rotary drilling bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210033292U true CN210033292U (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920619082.6U Active CN210033292U (en) | 2019-04-30 | 2019-04-30 | Bottomless type two-bucket rotary drilling bit |
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| CN (1) | CN210033292U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111395968A (en) * | 2020-04-30 | 2020-07-10 | 长沙市金钻机械有限公司 | Split type two-bucket rotary drilling bit |
-
2019
- 2019-04-30 CN CN201920619082.6U patent/CN210033292U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111395968A (en) * | 2020-04-30 | 2020-07-10 | 长沙市金钻机械有限公司 | Split type two-bucket rotary drilling bit |
| CN111395968B (en) * | 2020-04-30 | 2021-07-27 | 长沙市金钻机械有限公司 | Split type two-bucket rotary drilling bit |
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