Reverse drilling type anti-blocking drill bit for rock-soil drilling

Abstract

The utility model relates to the technical field of drill bits of rock-soil drilling machines, and discloses a reverse drilling type anti-blocking drill bit for rock-soil drilling, which comprises a drill bit assembly and a taper sleeve assembly, the drill bit assembly comprises a connecting pipe sleeve, a drilling part and a plurality of cutting teeth A mounted at one end, far away from the connecting pipe sleeve, of the drilling part, the taper sleeve assembly comprises a conical barrel, a spiral piece fixedly arranged on the conical barrel along the conical surface, and a plurality of cutting teeth B evenly distributed on the edge circumference of the large-diameter end of the conical barrel and used for cutting tool chemical heat treatment. And a spiral piece is fixedly arranged on the conical barrel along the conical surface, so that slag can be quickly discharged when the drill bit drills holes. According to the utility model, the taper sleeve assembly and the drill bit assembly cooperate with each other, the spiral sheet cuts and conveys rock slag during drilling, and accumulation and jamming at the connecting pipe sleeve are prevented; during drill withdrawal, the large-end cutting teeth B cut the shrinkage hole, reaming is achieved, the hole collapse and drill jamming risks are reduced, and the reliability and safety of drilling operation are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of rock and earth drilling machine drill bit, especially to a reverse drilling type anti-jamming drill bit for rock and earth drilling. BACKGROUND

[0002] The drill bit is a punching device used in rock and earth construction, which is generally used with anchor rod drilling machine, geological advanced drilling machine and the like, and the drill bit performs rotary motion and axial impact motion to complete drilling during construction, and the drilling method has high drilling efficiency and high safety factor, and is widely used in rock and earth construction in China.

[0003] The existing drill bit comprises a drilling-in part and a connecting sleeve connected in sequence, a thread is arranged in the connecting sleeve for connecting with a drill rod, and a plurality of cutting teeth are distributed at the end of the drilling-in part away from the connecting sleeve; in use, the connecting sleeve is connected with the drill rod, and can rotate under the driving of the drill rod and perform axial motion under impact, so that the cutting teeth are driven to move together with the drilling-in part and the cutting teeth to drill rock and earth; the existing drill bit technology is relatively mature, but still has some defects and improvement space in actual application, mainly in that:

[0004] Firstly, when drilling in broken and rapidly expanding rock mass, the rock is extruded and deformed, and the rock debris is accumulated after hole collapse, so that jamming is often formed at the connecting sleeve of the drill bit, which causes the drill bit and the drill rod to be difficult to smoothly exit, and the drill bit is frequently jammed. This not only seriously affects the drilling efficiency, but also easily causes huge economic losses, especially in TBM (full-face tunnel boring machine) mounted geological prediction or advanced support operation, once the drill bit is jammed, the TBM equipment is likely to be damaged, and even the whole project may be delayed, further increasing the economic losses. Therefore, solving the problem of jamming is crucial to ensure the smooth progress of drilling operation.

[0005] Secondly, when deep hole drilling is performed at a large downward angle, the problems and challenges are significantly increased, because the drilling angle is large, the drill debris is more likely to accumulate at the rear end of the drilling-in part under the action of gravity, which greatly disturbs the smooth drilling. The accumulation of drill debris seriously blocks the drilling channel, making it difficult for the drill bit to continue to drill deeper, which not only greatly reduces the drilling speed and seriously delays the progress of the project, but also increases the energy consumption and cost during drilling. More seriously, if the drill debris cannot be removed in time, it may cause failure of the drilling equipment, and even lead to failure of the whole drilling operation.

[0006] Therefore, whether it is jamming or hole shrinkage, it poses a major challenge to drilling operation, not only affecting the construction progress, but also possibly damaging the equipment, and it is urgent to improve the design of the drill bit to cope with complex geological conditions. CONTENT OF THE UTILITY MODEL

[0007] In order to make up for the above shortcomings, the utility model provides a kind of anti-drill type anti-jamming drill bit for rock-soil drilling, to improve the prior art in the drilling operation when unable to avoid rock in the drilling department rear-end accumulation jam, when not convenient to exit drill rod in the case of hole collapse, shrinkage problem.

[0008] To achieve the above object, the utility model provides the following technical scheme: a kind of anti-drill type anti-jamming drill bit for rock-soil drilling, including drill bit assembly and cone sleeve assembly, the drill bit assembly includes the connecting pipe sleeve, drilling department, the cutting tooth A of a plurality of being installed at the end of drilling department away from connecting pipe sleeve is sequentially connected;

[0009] The cone sleeve assembly includes conical cylinder, spiral blade fixedly arranged on the conical surface of conical cylinder, a plurality of cutting teeth B of edge tooling heat treatment that the large diameter end edge circumference of conical cylinder is uniformly distributed.

[0010] Further, the conical cylinder is fixedly provided with spiral blade along the conical surface, to facilitate the quick out of the drill drilling, and the large diameter end edge circumference of the conical cylinder is uniformly distributed with a plurality of cutting teeth B of edge tooling heat treatment;Conical cylinder is fixedly sleeved on connecting pipe sleeve, and the small diameter end of conical cylinder is close to or abuts drilling department, and the maximum axial projection circle diameter of drill bit assembly and cone sleeve assembly is equal.

[0011] Further, the cone sleeve assembly can be manufactured integrally with the drill bit assembly, or can be manufactured separately from the drill bit assembly.

[0012] Further, the conical cylinder is processed with through thread along the axis.

[0013] Further, the conical cylinder and connecting pipe sleeve are connected by thread.

[0014] Further, the cone sleeve assembly can be installed on the existing ordinary drill bit and used alone, when using, the cone sleeve assembly is sleeved into the tail connecting pipe sleeve of existing drill bit, and is connected by welding;Thread can be machined on the tail connecting pipe sleeve of existing ordinary drill bit, and the cone sleeve assembly is connected by thread.

[0015] Further, the connecting pipe sleeve is provided with thread, which can be connected with the existing drill rod by thread when used.

[0016] Further, it can also be manufactured integrally with the drill rod.

[0017] The utility model has the following beneficial effects:

[0018] 1. The utility model discloses a reverse drilling type anti jamming drill head for rock and soil drilling, which comprises a drill head assembly and a cone sleeve assembly.

[0019] 2. The utility model discloses a reverse drilling type anti jamming drill head for rock and soil drilling, which comprises a drill head assembly and a cone sleeve assembly. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 FIG. 1 is a perspective view of a reverse drilling type anti jamming drill head for rock and soil drilling according to the utility model.

[0021] Figure 2 FIG. 2 is a perspective view of a cone sleeve of a reverse drilling type anti jamming drill head for rock and soil drilling according to the utility model.

[0022] Figure 3 FIG. 3 is a perspective view of a drilling part of a reverse drilling type anti jamming drill head for rock and soil drilling according to the utility model.

[0023] LEGEND

[0024] 1. Connecting pipe sleeve; 2. Drilling part; 3. Cutting tooth A; 4. Cone sleeve; 5. Spiral piece; 6. Cutting tooth B. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0026] REFERENCE Figure 1 , Figure 2 and Figure 3The utility model provides an embodiment: a kind of anti-drill type anti-jamming drill bit for geotechnical drilling, including drill bit assembly and cone sleeve assembly, drill bit assembly includes the connecting pipe sleeve 1 of sequentially connected, drilling portion 2, the cutting tooth A 3 of a plurality of being installed in the end of drilling portion 2 away from connecting pipe sleeve 1;Cone sleeve assembly includes conical cylinder 4, spiral blade 5 being fixedly arranged on conical cylinder 4 along taper surface, the cutting tooth B 6 of a plurality of being evenly distributed on the edge circle of large diameter end of conical cylinder 4 and being heat treated with blade tooling;Conical cylinder 4 is fixedly set on connecting pipe sleeve 1, the small diameter end of conical cylinder 4 is close to or abuts drilling portion 2, and the maximum axial projection circle diameter of drill bit assembly and cone sleeve assembly is equal.

[0027] Specifically, a kind of anti-drill type anti-jamming drill bit for geotechnical drilling cone sleeve assembly of the drill bit includes conical cylinder 4, spiral blade 5 is fixedly arranged on conical cylinder 4 along taper surface, the cutting tooth B 6 of a plurality of being evenly distributed on the edge circle of large diameter end of conical cylinder 4 and being heat treated with blade tooling, the end of cutting tooth B 6 away from conical cylinder 4 is inclined to the axis direction of conical cylinder 4 and to the large diameter end direction of conical cylinder 4, i.e. the end of cutting tooth B 6 is inclined to the outside rear of the large diameter end direction of conical cylinder 4, the projection circle diameter of above-mentioned spiral blade 5 is less than the projection circle diameter surrounded by the end of a plurality of cutting tooth B 6 away from conical cylinder 4.

[0028] Referring to Figure 1 , Figure 2 and Figure 3 , cone sleeve assembly can be manufactured with drill bit assembly, also can be manufactured with drill bit assembly split;Conical cylinder 4 is processed with through thread along axis;Conical cylinder 4 is connected with connecting pipe sleeve 1 by thread;Cone sleeve assembly can be installed on existing ordinary drill bit and used alone, when using, conical sleeve assembly is sleeved into the tail connecting pipe sleeve 1 of existing drill bit, and is connected by welding;Also can be processed thread on the tail connecting pipe sleeve 1 of existing ordinary drill bit, and is connected with cone sleeve assembly by thread;Connecting pipe sleeve 1 is provided with thread, when using, can be connected with existing drill rod thread;Also can be manufactured with drill rod.

[0029] Specifically, the cone sleeve assembly is applied, as Figure 2 , Figure 3 indicated, is used in conjunction with existing drill bit assembly to form a kind of anti-drill type anti-jamming drill bit for geotechnical drilling.

[0030] The existing drill bit assembly comprises a drilling part 2 and a connecting sleeve 1 connected in sequence, the drilling part 2 is provided with a plurality of cutting teeth A3 at the end away from the connecting sleeve 1, and a plurality of medium holes are further provided on the drilling part 2 and communicate with the hollow interior of the connecting sleeve 1, the diameter of the circle surrounded by the end of the drilling part 2 with the largest diameter cutting tooth A3 is greater than the outer diameter of the connecting sleeve 1, flushing water is simultaneously introduced through the connecting sleeve 1 during drilling operation, when the cutting teeth A3 cut the rock mass, the cuttings are carried backward by the flushing water flowing out of the medium holes, and the cuttings can be discharged upward by the flushing water through the space between the outer wall of the connecting sleeve 1 and the inner wall of the drilled hole, but when drilling in broken and rapidly expanding rock mass and deep hole drilling at a large angle downward, the cuttings are easy to block at the position of the outer wall of the connecting sleeve 1, and the flushing water pressure is not enough to dredge; in addition, when drilling in broken and rapidly expanding rock mass and the like, the hole diameter behind the drill bit is often reduced due to the hole collapse, which makes it difficult to take out the drill bit.

[0031] The anti-blocking drill bit for rock drilling is provided with the aforementioned cone sleeve assembly for drilling construction on the basis of the existing drill bit assembly, the conical barrel 4 is fixedly sleeved on the connecting sleeve 1, the small-diameter end of the conical barrel 4 is close to or abuts against the drilling part 2, the conical barrel 4 and the helical blade 5 rotate together with the drill bit assembly during drilling, the accommodation cavity is formed between the outer wall of the conical barrel 4 and the inner wall of the drilled hole, the cuttings are carried into the accommodation cavity by the flushing water and are cut again by the helical blade 5 and carried upward to the position of the drill rod behind the large-diameter end of the conical barrel 4, since the diameter of the drill rod is smaller than that of the connecting sleeve 1, there is a large space between the outer wall of the drill rod and the inner wall of the drilled hole at the position of the drill rod, which is not easy to be blocked, and the cuttings can be effectively prevented from piling up and blocking at the position of the connecting sleeve 1. The projection circle diameter surrounded by the plurality of cutting teeth A3 away from the end of the conical barrel 4 is equal to the projection circle diameter surrounded by the plurality of cutting teeth B6 away from the end of the drilling part 2, if the hole collapses or shrinks during drilling, the drill bit assembly can be continuously rotated when the drill bit is taken out, the hole is expanded by cutting the position of the hole shrinkage by the cutting teeth B6, and the drill bit can be conveniently taken out after the hole expansion.

[0032] It should be noted that, in order to realize the convenient taking out of the drill bit after the hole expansion, the projection circle diameter of the plurality of cutting teeth A3 at the extending end should be equal to the projection circle diameter of the plurality of cutting teeth B6 at the extending end, which will result in that the distance between the position where the conical barrel 4 is installed with the cutting teeth A3 and the inner wall of the drilled hole is close and the gap is small, therefore, the conical barrel 4 needs to be designed in a conical structure so that the outer side has a large cuttings accommodation space; the helical blade 5 is designed in a conical helix, which also has the effect of cutting and carrying the cuttings in sections, thereby reducing the cuttings discharge load; in addition, the cutting teeth B6 are uniformly and interval arranged, and there is also a sufficient space between the adjacent two cutting teeth B6 to smoothly discharge the cuttings.

[0033] Principle of implementation: the anti-sticking and anti-clogging drill bit for rock and soil drilling can be designed as an integrated structure, or a thread can be machined through the axis in the conical cylinder 4, an outer thread is machined on the outer wall of the connecting sleeve 1 in the existing drill bit assembly, the conical cylinder 4 is threadedly connected with the connecting sleeve 1, the existing drill bit assembly is used to complete the modification, the conical sleeve assembly can be sleeved into the connecting sleeve 1 at the tail of the existing drill bit, the conical sleeve assembly is fixedly connected with the connecting sleeve 1 of the existing drill bit by welding, or an outer thread is machined on the connecting sleeve 1 of the existing drill bit and is threadedly connected with the conical sleeve assembly. The anti-sticking and anti-clogging drill bit for rock and soil drilling is provided with a thread in the connecting sleeve 1, which can be threadedly connected with an existing drill rod in use, or can be integrally manufactured with the drill rod.

[0034] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing detailed description of the present application is made with reference to the foregoing embodiments, for those skilled in the art, it still can be modified, or the equivalent replacement of part of the technical features, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A back-reaming type anti-jamming drill bit for drilling into ground, comprising a bit assembly and a cone sleeve assembly, characterized in that: The drill bit assembly comprises a connecting sleeve (1), a drilling part (2), and a plurality of cutting teeth A (3) installed at the end of the drilling part (2) away from the connecting sleeve (1). The cone sleeve assembly comprises a conical barrel (4), a spiral blade (5) fixed on the conical barrel (4) along the conical surface, and a plurality of cutting teeth B (6) with heat treatment of edge tooling uniformly distributed along the circumference of the large-diameter end edge of the conical barrel (4).

2. The anti-jamming and anti-clogging drill bit of claim 1, wherein: The conical barrel (4) is fixedly provided with a spiral blade (5) along the conical surface, and a plurality of cutting teeth B (6) with heat treatment of edge tooling are uniformly distributed along the circumference of the large-diameter end edge of the conical barrel (4); the conical barrel (4) is fixedly sleeved on the connecting sleeve (1), the small-diameter end of the conical barrel (4) is close to or abuts against the drilling part (2), and the maximum axial projection circle diameter of the drill bit assembly and the cone sleeve assembly is equal.

3. The anti-jamming and anti-clogging drill bit of claim 1, wherein: The cone sleeve assembly can be manufactured integrally with the drill bit assembly or separately from the drill bit assembly.

4. The anti-jamming and anti-clogging drill bit of claim 3, wherein: A through thread is machined along the axis in the conical barrel (4).

5. The anti-jamming and anti-clogging drill bit of claim 4, wherein: The conical barrel (4) is connected with the connecting sleeve (1) through threads.

6. The anti-jamming and anti-clogging drill bit of claim 3, wherein: The cone sleeve assembly can be installed on an existing ordinary drill bit and used alone, and when used, the cone sleeve assembly is sleeved into the connecting sleeve (1) at the tail of the existing drill bit and connected by welding; or threads can be machined on the connecting sleeve (1) at the tail of the existing ordinary drill bit, and the cone sleeve assembly is connected through threads.

7. The anti-jamming and anti-clogging drill bit of claim 1, wherein: The connecting sleeve (1) is provided with threads, which can be connected with existing drill rods through threads when used.

8. The anti-jamming and anti-clogging drill bit of claim 7, wherein: The drill rod can also be manufactured integrally.

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