CN218439231U - Multistage cross all-steel drill bit - Google Patents
Multistage cross all-steel drill bit Download PDFInfo
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- CN218439231U CN218439231U CN202222303450.0U CN202222303450U CN218439231U CN 218439231 U CN218439231 U CN 218439231U CN 202222303450 U CN202222303450 U CN 202222303450U CN 218439231 U CN218439231 U CN 218439231U
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Abstract
The utility model belongs to the technical field of ground is from boring formula rock drilling tool. The multi-step cross all-steel drill bit comprises a drill bit body and multi-step wing plate units, wherein four sets of multi-step wing plate units are distributed on the drill bit body in a cross manner, and each multi-step wing plate unit comprises a top cutting edge positioned at the top, a main cutting edge positioned at the bottom and at least one-step auxiliary cutting edge positioned in the middle; the multi-step wing plate unit comprises a stepped wing plate end face and a gradual change body, the front end of the gradual change body corresponds to the wing plate end face, the rear end of the gradual change body is connected with the drill bit body, the diameter of the outer circle of the gradual change body is gradually reduced from the front end to the rear end, and a lateral water hole is formed in the gradual change body. This application structural design is reasonable, can creep into at the great geological conditions who fills out soil or clay of viscidity, through the design of the cutting part of the difference on the different graduated circles, improves the wearability and the drilling efficiency of drill bit.
Description
Technical Field
The utility model belongs to the technical field of ground is from boring formula rock drilling tool, concretely relates to multistage cross all steel drill bit.
Background
With the increase of national infrastructure and the continuous increase of labor cost, the requirement on engineering construction efficiency is higher and higher, and the self-drilling anchoring system is taken as an efficient construction method, integrates drilling, grouting and anchoring into a whole, is popularized more and more domestically, is used in a large number in railway, highway and tunnel construction, underground infrastructure construction, mining industry, building foundation pits, landslide control and mountain support, solves the problem of hole collapse in common anchor rod construction, and can ensure the grouting effect under complex geological conditions.
The drill bit in the self-drilling anchoring system is a disposable drill bit, and in order to reduce the construction cost, the drill bits with different structures are required to be selected under different geological conditions. The cross all-steel drill bit is widely suitable for soft rock geological conditions such as mud rock, gravel soil, chalky soil, limestone soil, calcareous clay, artificial filling soil, weak mud rock and the like. However, due to the simple single-step structure and the position of the slurry outlet hole of the cross all-steel drill bit on the market, when the cross all-steel drill bit meets filling soil or clay with high viscosity, the rotary drilling effect is not ideal and even the cross all-steel drill bit cannot drill because the deslagging effect is poor. The construction method can only take out the drilled drill bit and then clean the soil stuck on the drill bit or drill the drill bit again after replacing the drill bit, thereby seriously affecting the construction efficiency.
Disclosure of Invention
The utility model discloses the purpose is to the problem that the aforesaid exists with not enough, provides a multistage cross all steel drill bit, its structural design is reasonable, can creep into in the great geological conditions who fills out soil or clay of viscidity, through the design of the different cutting parts on the different graduated circles, improves the wearability and the drilling efficiency of drill bit.
In order to realize the purpose, the adopted technical scheme is as follows:
a multi-step cross all-steel drill bit comprises a drill bit body and four multi-step wing plate units, wherein the four multi-step wing plate units are distributed on the drill bit body in a cross manner;
the multi-stage wing plate unit includes:
the wing plate end surface is in a step shape; and
the front end of the gradually-changing body corresponds to the end face of the wing plate, the rear end of the gradually-changing body is connected with the drill bit body, the diameter of the outer circle of the gradually-changing body is gradually reduced from the front end to the rear end, and a side water hole is formed in the gradually-changing body;
each multi-stage wing plate unit is provided with a top cutting edge positioned at the top, a main cutting edge positioned at the bottom and at least one-stage auxiliary cutting edge positioned in the middle.
According to the utility model discloses multistage cross all-steel drill bit, preferably, the ladder face downward sloping setting on the gradual change body, the rear end of gradual change body is tangent with the drill bit body.
According to the utility model discloses multistage cross all-steel drill bit, preferably, be provided with two sets of third-order pterygoid lamina units and two sets of fourth-order pterygoid lamina units on the drill bit body, third-order pterygoid lamina unit and fourth-order pterygoid lamina unit each other are 90 and arrange.
According to the utility model discloses multistage cross all-steel drill bit, preferably, the apex angle of the top sword of the relative two sets of third-order pterygoid lamina units that set up and the apex angle of the top sword of the relative two sets of fourth-order pterygoid lamina units that set up are 120 ~ 170.
According to the utility model discloses multistage cross all-steel drill bit, preferably, the axis in the side water hole on the pterygoid lamina unit of the third order with the contained angle of the axis of drill bit body is alpha, the axis in the side water hole on the pterygoid lamina unit of the fourth order with the contained angle of the axis of drill bit body is beta, and alpha ≠ beta.
According to the utility model discloses multistage cross all-steel drill bit, preferably, the excircle diameter that the side water hole on the pterygoid lamina unit of the third order was located is D1, the excircle diameter that the side water hole on the pterygoid lamina unit of the fourth order was located is D2, and D1 ≠ D2.
According to the utility model discloses multistage cross all-steel drill bit, preferably the side water hole on the pterygoid lamina unit of the third order with in the two of the side water hole of fourth order pterygoid lamina unit, one of them is seted up on the outer disc of the gradual change body that corresponds, and another is seted up on the ladder face of the gradual change body that corresponds.
According to the utility model discloses multistage cross all steel drill bit, preferably, the sword angle gamma 1 of top sword is 30 ~40, the sword angle gamma 2 of main cutting edge is 55 ~ 65. The cutting edge angle of the secondary cutting edge is gamma 3, and gamma 1 is more than gamma 3 and less than gamma 2.
According to the utility model discloses multistage cross all-steel drill bit, preferably, the coaxial intercommunication in middle part of drill bit body is provided with screw hole and blind hole, the side water hole with the blind hole intercommunication.
By adopting the technical scheme, the beneficial effects are as follows:
compare in ordinary single rank cross all steel drill bit, this application increases the different cutting parts of a plurality of reference circles on cross drill bit structure basis, and the cutting part on the different levels is through changing the design of sword angle for the cutting part that is in different reference circles makes the wearability of drill bit obtain good improvement. These multiple step edges with increasing diameter along the drilling direction significantly increase the efficiency of drilling. Simultaneously, two mutually perpendicular, the different cutting parts of structure and the side water hole of different inclination and orientation can produce the venturi effect when creeping into, and its row's sediment efficiency has obvious promotion than ordinary cross drill bit, makes it creep into in the geological condition of the great banket or clay of viscidity.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly described hereinafter. The drawings are intended to depict only some embodiments of the invention, and not all embodiments of the invention are limited thereto.
Fig. 1 is a schematic structural view of a multi-step cross all-steel drill according to an embodiment of the present invention.
Fig. 2 is a second schematic structural view of a multi-step cross all-steel drill according to an embodiment of the present invention.
Fig. 3 is a third schematic structural view of a multi-step cross all-steel drill according to an embodiment of the present invention.
Fig. 4 isbase:Sub>A schematic view of the structure in the direction ofbase:Sub>A-base:Sub>A in fig. 3.
Number in the figure:
100 is a drill bit body, 101 is a threaded hole, and 102 is a blind hole;
200 is a three-step wing plate unit, 201 is a top edge, 202 is a secondary cutting edge, 203 is a main cutting edge, 204 is a wing plate end surface, 205 is a gradual change body, 206 is a step surface, 207 is a side water hole;
300 is a four-step wing unit.
Detailed Description
The embodiments of the present invention will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. Unless defined otherwise, technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for describing various elements of the present invention, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.
It should be noted that when an element is referred to as being "connected," "coupled," or "connected" to another element, it can be directly connected, coupled, or connected, but it is understood that intervening elements may be present therebetween; i.e., to encompass both direct and indirect positional relationships.
It should be noted that the use of the terms "a" or "an" and the like do not necessarily denote a limitation of quantity. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.
It should be noted that terms indicating orientation or positional relationship such as "upper", "lower", "left", "right", and the like, are used only for indicating relative positional relationship, which is for convenience of describing the present invention, and not that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation; when the absolute position of the object to be described changes, the relative positional relationship may also change accordingly.
Referring to fig. 1-4, the application discloses a multistage cross all-steel drill bit, including drill bit body 100 and multistage pterygoid lamina unit, four sets of multistage pterygoid lamina units are arranged on drill bit body 100 in the cross, and the middle part coaxial intercommunication of drill bit body 100 is provided with screw hole 101 and blind hole 102, and side water hole 207 communicates with blind hole 102. The threaded hole is connected with the blind hole, and the blind hole is connected with the side water hole. In the self-drilling anchoring system, grout is injected into the drill bit blind hole part from the hollow anchor rod and flows out of the drill bit trousers body from the lateral water hole, so that efficient construction of drilling and grouting in the self-drilling anchoring system is realized.
In this embodiment, each multi-step wing plate unit comprises a top cutting edge 201 at the top, a main cutting edge 203 at the bottom and at least one secondary cutting edge 202 at the middle; the four sets of multi-step wing plate units in this embodiment include two sets of three-step wing plate units 200 and two sets of four-step wing plate units 300 arranged on the drill body 100, the three-step wing plate units 200 and the four-step wing plate units 300 are arranged at 90 degrees to each other, the middle of the three-step wing plate units 200 is provided with the first-order secondary cutting edge 202, and the middle of the four-step wing plate units 300 is provided with the second-order secondary cutting edge 202.
The three-step wing plate unit and the four-step wing plate unit respectively comprise a stepped wing plate end surface 204 and a gradually-changed body 205, the front end of the gradually-changed body 205 corresponds to the wing plate end surface 204, the rear end of the gradually-changed body 205 is connected with the drill bit body 100, the diameter of the outer circle of the gradually-changed body 205 is gradually reduced from the front end to the rear end, and a lateral water hole 207 is formed in the gradually-changed body 205; preferably, the stepped surface 206 of the gradually-changing body 205 is arranged to be inclined downwards, and the rear end of the gradually-changing body 205 is tangent to the bit body 100, so that the gradually-changing body and the bit body form a smooth-transition integral structure.
The vertex angles of the top edges of the two oppositely arranged groups of third-order wing plate units 200 and the vertex angles of the top edges of the two oppositely arranged groups of fourth-order wing plate units 300 are both 120-170 degrees and are conical. Compared with the four edges of the top edge of the single-step cross all-steel drill bit which are all on the same plane, the top angle of 120-170 degrees further improves the rock stratum crushing effect of the drill bit during rotary drilling; meanwhile, the conical structure of the top blade ensures the slag discharging effect of the top blade; the included angle of the top edge larger than 120 degrees can delay the abrasion of the edge part.
For the arrangement of the side water holes on the different wing plate units: the included angle between the axis of the water hole 207 on the third-order wing plate unit 200 and the axis of the drill body 100 is α, and the included angle between the axis of the water hole 207 on the fourth-order wing plate unit 300 and the axis of the drill body 100 is β, α ≠ β. The excircle diameter that the side water hole 207 on the pterygoid lamina unit 200 of third order is located is D1, and the excircle diameter of the side water hole 207 on the pterygoid lamina unit 300 of fourth order is D2, and D1 ≠ D2. One of the side water holes 207 of the third-order wing plate unit 200 and the side water holes 207 of the fourth-order wing plate unit 300 is opened on the outer circumferential surface of the corresponding transition body 205, and the other is opened on the stepped surface 206 of the corresponding transition body 205. The side water hole on three-order pterygoid lamina unit and the four-step pterygoid lamina unit is different with drill bit axis contained angle, the excircle diameter of distributing is different, compare with 4 water holes that the axis contained angle is the same and equally divide of single-step cross all-steel drill bit, different angles, the side water hole that different external diameters distribute, can be more high-efficient, wash away the piece of drilling front end rapidly, promote and creep into efficiency, and two mutually perpendicular's cutting part have certain barrier effect to rivers at rotatory in-process, make the thick liquid drive at the drill bit is rotatory, the promotion of two mutually perpendicular's cutting part faces, and under the interact of the multi-stage structure of different reference circles, the thick liquid velocity of flow of different ranks is different, produce the venturi effect, produce near the thick liquid that flows at high speed low pressure, thereby produce the adsorption, promote the drill bit and arrange the sediment effect, avoid the sticking.
The cutting edges of different steps have different distances from the top of the drill body along the drilling direction, and the maximum cutting outer circle of the cutting edge is larger as the distance increases. During the rotary drilling process of the drill bit, the top blade is firstly contacted with the rock stratum, and the diameter of the rock stratum damaged by the top blade is smaller; the damage degree of the rock stratum is further improved by the auxiliary cutting edge along with the deep drilling; the formation is then further damaged by the outermost major cutting edge to achieve the desired borehole diameter. In addition, the cutting edges are different in distribution diameter and different in cutting edge part of different steps, the edge angle gamma 1 of the top edge 201 is 30-40 degrees, and the edge angle gamma 2 of the main cutting edge 203 is 55-65 degrees. The cutting angle of the secondary cutting edge 202 is gamma 3, gamma 1 < gamma 3 < gamma 2, preferably, the cutting angle of the top cutting edge in the embodiment is preferably 35 degrees, and the smaller cutting angle can improve the drilling efficiency; the cutting edge angle of the outermost circle main cutting edge is preferably 60 degrees, and the outermost circle main cutting edge is easy to wear during drilling due to the fact that the moment borne by the outermost circle main cutting edge is large, so that the cutting edge angle is large, and the service life of the drill bit is prolonged.
Compared with a single-order cross all-steel drill bit, the multi-order cross all-steel drill bit is firstly a point in contact with a rock stratum and then a surface is gradually formed, the moment distributed by the cutting edges of different orders is different from the small surface to the large surface, and the moment is distributed most when the main cutting edge on the outermost circle drills. The moment distribution difference of the cutting edges at the same order is smaller. Compared with a single-order cross all-steel drill bit, when the single-order cross all-steel drill bit is used for rotary drilling, two mutually perpendicular blade parts on the same plane are not uniformly stressed, and the blade parts are easier to wear. And the cutting edges distributed in different steps have different abrasion degrees during rotary drilling, so that the service life of the drill bit is prolonged.
Aiming at the multi-step wing plate unit, the matching of a four-step wing plate unit and a five-step wing plate unit or the matching of a three-step wing plate unit and a five-step wing plate unit can be selected according to practical application, and the method and the device are not limited to the specific order of the wing plate unit.
While the above description has described in detail the preferred embodiments for carrying out the invention, it should be understood that these embodiments are presented by way of example only, and are not intended to limit the scope, applicability, or configuration of the invention in any way. The scope of the invention is defined by the appended claims and equivalents thereof. Those skilled in the art can make many changes to the foregoing embodiments, which fall within the scope of the invention, in light of the above teachings.
Claims (9)
1. A multi-step cross all-steel drill bit is characterized by comprising a drill bit body and four multi-step wing plate units, wherein the four multi-step wing plate units are distributed on the drill bit body in a cross manner;
the multi-stage sail unit includes:
the wing plate end surface is in a step shape; and
the front end of the gradually-changed body corresponds to the end face of the wing plate, the rear end of the gradually-changed body is connected with the drill bit body, the outer circle diameter of the gradually-changed body is gradually reduced from the front end to the rear end, and the gradually-changed body is provided with a lateral water hole;
each multi-order wing plate unit is provided with a top cutting edge positioned at the top, a main cutting edge positioned at the bottom and at least one-order auxiliary cutting edge positioned at the middle part.
2. The multi-step cross all-steel drill bit as claimed in claim 1, wherein the stepped surface of the gradually-changing body is inclined downwards, and the rear end of the gradually-changing body is tangent to the drill bit body.
3. The multi-step cross all-steel drill bit as claimed in claim 1 or 2, wherein the drill bit body is provided with two sets of three-step wing plate units and two sets of four-step wing plate units, and the three-step wing plate units and the four-step wing plate units are arranged at 90 ° to each other.
4. The multi-step cross all-steel drill bit as claimed in claim 3, wherein the top angles of the top edges of the two oppositely disposed sets of three-step wing plate units and the top angles of the top edges of the two oppositely disposed sets of four-step wing plate units are both 120 ° -170 °.
5. The multi-step cross all-steel drill bit as claimed in claim 3, wherein the angle between the axis of the lateral water holes on the third-step wing plate unit and the axis of the drill bit body is α, and the angle between the axis of the lateral water holes on the fourth-step wing plate unit and the axis of the drill bit body is β, α ≠ β.
6. The multi-step cross all-steel drill bit as claimed in claim 5, wherein the lateral water holes of the three-step wing plate unit are located at an outer diameter D1, and the lateral water holes of the four-step wing plate unit are located at an outer diameter D2, D1 ≠ D2.
7. The multi-step cross all-steel drill bit according to claim 5 or 6, wherein one of the side water holes of the third-step wing plate unit and the side water holes of the fourth-step wing plate unit is arranged on the outer circular surface of the corresponding gradually-changed body, and the other is arranged on the stepped surface of the corresponding gradually-changed body.
8. The multi-step cross all-steel drill bit according to claim 3, wherein the cutting angle γ 1 of the top cutting edge is 30 ° -40 °, the cutting angle γ 2 of the main cutting edge is 55 ° -65 °, the cutting angle γ 3 of the secondary cutting edge is γ 3, and γ 1 < γ 3 < γ 2.
9. The multi-step cross all-steel drill bit as claimed in claim 1, wherein the drill bit body has a threaded hole and a blind hole coaxially connected to the middle portion of the drill bit body, and the lateral water hole is connected to the blind hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222303450.0U CN218439231U (en) | 2022-08-31 | 2022-08-31 | Multistage cross all-steel drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222303450.0U CN218439231U (en) | 2022-08-31 | 2022-08-31 | Multistage cross all-steel drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218439231U true CN218439231U (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222303450.0U Active CN218439231U (en) | 2022-08-31 | 2022-08-31 | Multistage cross all-steel drill bit |
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| Country | Link |
|---|---|
| CN (1) | CN218439231U (en) |
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2022
- 2022-08-31 CN CN202222303450.0U patent/CN218439231U/en active Active
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