CN205918370U - Impacted style rock drilling brazing tool - Google Patents
Impacted style rock drilling brazing tool Download PDFInfo
- Publication number
- CN205918370U CN205918370U CN201620958076.XU CN201620958076U CN205918370U CN 205918370 U CN205918370 U CN 205918370U CN 201620958076 U CN201620958076 U CN 201620958076U CN 205918370 U CN205918370 U CN 205918370U
- Authority
- CN
- China
- Prior art keywords
- screw thread
- blind hole
- thread
- external screw
- section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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Abstract
The utility model discloses an impacted style rock drilling brazing tool belongs to rock drilling brazing tool, aim at providing a long service life's rock drilling brazing tool. It including the trousers body that has the screw blind hole, through establish the external screw thread at anterior segment position with the drill rod that the blind hole cooperation is connected, drill rod (2) are type ladder shaft structure, the external screw thread section (2 1 )The front end have cylindric changeover portion (2 4 ), is the length of this changeover portion less than or equal to screw thread blind hole (1 2 )Screw thread final phase of a project department and hole bottom (1 1 )The distance, the external screw thread section (2 1 )With middle section (2 2 )Between through the conical surface shaft shoulder (2 3 )Connect the transition, the screw thread blind hole (1 2 )Drill way department have with the interior conical surface (1 of this shaft shoulder looks adaptation 3 ) when external screw thread section (2 1 )With screw thread blind hole (1 2 )Changeover portion (the 2 when cooperation is screwed up 4 )Preceding terminal surface (2 5 )With screw thread blind hole (1 2 )Hole bottom (1 1 )The contact. The utility model discloses drilling tool's the trousers body and the difficult fracture of drill rod are a rock drilling drilling tool's improvement structures.
Description
Technical field
This utility model is related to a kind of drill rod, more particularly, to a kind of boring by percussion drilling tool.
Background technology
At present, boring by percussion drilling tool is generally formed by connecting by the diaper body of screw thread and bore bit by drill steel.In rock drilling process
In, drill steel, diaper body stressing conditions are more complicated, severe, easily cause drilling tool and lose efficacy, affect the drilling tool life-span.Make discovery from observation,
Drilling tool lost efficacy mainly two kinds of forms: 1) ruptures at the female thread ending of diaper body tapped blind hole；2) drill steel external thread section is received
Rupture at tail.By analysis, cause diaper body or drill steel major cause of failure as follows:
1) due to offering escape at female thread ending, relatively thin, strong corresponding to the diaper body wall at this withdrawing groove location
Degree is weaker, and stress is usually focused on the intersection of escape and tapped blind hole, and therefore diaper body fracture easily generation is blind in screw thread
Hole and the intersection of escape.
2) because stress has focused largely at drill steel external screw thread ending, when by Moment, drill steel is easily in external screw thread
Rupture at ending.
For this reason, " us6767156b1 " discloses a kind of threaded drill rod of impact type.The drill steel of this patent has two
Individual tapered guide face (external thread section front end being located at drill steel, another be located at the intersection of the shaft shoulder and external thread section), trousers
Two inner conical surfaces corresponding with above-mentioned two tapered guide face are had in the tapped blind hole of body, and shaft shoulder right angle end face and diaper body end face
Keep contact, therefore axially exist serious cross positioning (two tapered guide faces and a shaft shoulder right angle end face), in diameter
Direction there is also positioning (two tapered guide faces).Although said structure can bear larger moment of flexure, bear axial punching
The ability hitting power is weaker.In actual use, even if two matching relationships between inner conical surface and the shaft shoulder process (excessively fixed very well
The interference degrees of position are less), but after structure stand under load deforms, (especially near female thread end face) very likely occurs by pricker
Bar shaft shoulder right angle end face (or corresponding female thread end face) and the conical surface of drill steel external thread section front end bear moment of flexure, thus leading to
The carrying arm of force reduces suddenly, moment of flexure local stress increases.Meanwhile, when shaft shoulder face (or female thread end face) discontinuity, its
The impulsive force (for the Main Load of combiner transmission) of transmission can increase the degree of stress raisers further, leads to part
Lost efficacy in short time.
In addition, " cn10289110b " discloses a kind of " drill bit boring for impact type rock ", this patent is with spiral shell in a section
Escape in stricture of vagina replacement tapped blind hole is although the relatively thin defect at escape of diaper body wall can be overcome, but internal thread machining
Relatively difficult.Moreover, due to eliminating escape, female thread extends to the bottom hole of tapped blind hole；Therefore in interior spiral shell
Stress concentration can be formed and the bottom hole of tapped blind hole between, thus leading to female thread easily to produce with bottom hole intersection at stricture of vagina ending
Crackle.Further, tie similar to simply supported beam because the drill steel of this patent is not provided with the shaft shoulder, therefore diaper body end face and threaded engagement line
Structure, necessarily leads to external screw thread to rupture at threaded engagement line under Moment, this be also currently traditional external screw thread topmost
Failure mode.
Content of the invention
For drawbacks described above present in prior art, this utility model aims to provide a kind of boring by percussion drilling tool, it
Crack at the tapped blind hole bottom hole that diaper body not only can be avoided but also can also prevent from rupturing at drill steel external screw thread ending,
Thus effectively improving the drilling tool life-span.
To achieve these goals, this utility model employs the following technical solutions: it is included with cylindrical thread blind hole
Diaper body, by being located at the drill steel that the external screw thread at leading portion position is connected with described tapped blind hole；Drill steel is with stage casing
Multidiameter structure；The front end of external thread section has diameter to be less than the cylindric changeover portion of tapped blind hole, and the length of this changeover portion is less than
Or equal to the distance with bottom hole at the screw-thread ending of tapped blind hole；It was connected by the conical surface shaft shoulder between external thread section and stage casing
Cross, at the aperture of tapped blind hole, have the inner conical surface being adapted with this shaft shoulder；The mistake when external thread section is tightened with tapped blind hole cooperation
The bottom hole of the front end face and tapped blind hole that cross section contacts.
Angle γ between the shaft shoulder and drill steel axis is 1～10 °, preferably 4 °.
The form of thread of tapped blind hole by rectilinear female thread crest, curved female thread tooth bottom and one end with
Two sections of linear female thread tooth sides that this tangent other end in female thread tooth bottom is connected with female thread crest are constituted；The spiral shell of external thread section
Stricture of vagina tooth form is by rectilinear external screw thread tooth bottom, curved external screw thread crest and one end and this tangent other end in external screw thread top
Two sections of linear external screw thread tooth sides being connected with external screw thread tooth bottom are constituted；Wherein, female thread tooth bottom and external screw thread crest are preferred
One section of curve on circular arc, ellipse, parabola or hyperbola, is preferably selected that section of curve corresponding to ellipse short shaft.
Compared with the prior art, this utility model, due to employing said structure, therefore has many advantages, such as, concrete analysis
As follows:
1) changeover portion is set in the front end of drill steel external thread section, and the pricker when external thread section is tightened with tapped blind hole cooperation
The front end face of bar changeover portion is contacted with the bottom hole of tapped blind hole, and therefore drill steel can pass through front end face and the tapped blind hole of this changeover portion
Bottom hole contact transmitting hitting power, thus the defect that the screw thread mating surface of traditional drilling tool is easily destroyed can be avoided.
2) for relatively conventional drill steel, due to employ multidiameter structure and the drill steel stage casing that is relatively large in diameter with diameter relatively
The shaft shoulder employing cone structure between little external thread section connects transition, therefore enhances the intensity of drill steel.
3) when external thread section is tightened with tapped blind hole cooperation, the front end face of drill steel changeover portion is connect with the bottom hole of tapped blind hole
The tactile but conical surface shaft shoulder is not contacted with inner conical surface；Therefore axially and radially all without there is positioning.Only when drill steel is subject to
During Moment, shaft shoulder ability is contacted with inner conical surface, therefore, it is possible to avoid at drill steel external thread section ending because by Moment
Fracture.
4) due to answering of employing that trapezoidal thread combines with similar to corrugated thread (form of thread be in wavelike structure)
Close tooth form, the therefore loading end of screw thread has that trapezoidal thread axial load resistant ability is strong, root of the tooth intensity is good concurrently simultaneously, and waveform spiral shell
The advantages of stricture of vagina bending resistance square performance is good.In addition, female thread tooth bottom and external screw thread crest all employ corresponding with ellipse short shaft
Curve (radius of curvature is less), therefore further increases the intensity of internal and external threads.
5) due to eliminating escape, the diaper body wall thickness at tapped blind hole bottom hole does not reduce, and therefore diaper body intensity is not
Reduce, will not rupture.
6) can also overcome what the shaft shoulder and diaper body in impact process easily sticked together to lack using the cooperation of inner conical surface and the conical surface shaft shoulder
Fall into.
Brief description
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the structural representation of tapped blind hole tooth form；
Fig. 3 is the structural representation of drill steel external thread section tooth form.
In figure: diaper body 1, bottom hole 1-1, tapped blind hole 1-2, inner conical surface 1-3, drill steel 2, external thread section 2-1, stage casing 2-2, axle
Shoulder 2-3, changeover portion 2-4, front end face 2-5, female thread crest 3, female thread tooth side 4, female thread tooth bottom 5, external screw thread pressure bottom 6, outer
Ridge side 7, external screw thread crest 8.
Specific embodiment
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings:
Embodiment 1
As shown in Figures 1 to 3: the diaper body 1 of bore bit is provided with the tapped blind hole 1-2 of cylinder, and drill steel 2 is by being located at its leading portion
The external thread section 2-1 at position is connected with this tapped blind hole.Drill steel 2 is the multidiameter structure with stage casing 2-2, the outer spiral shell of drill steel 2
The front end of stricture of vagina section 2-1 has diameter to be less than the cylindric changeover portion 2-4 of tapped blind hole 1-2, and the length of this changeover portion is less than or equal to
Distance with bottom hole 1-1 at the screw-thread ending of tapped blind hole 1-2.In order to avoid stress concentration, external thread section 2-1 and stage casing 2-2
Between by conical surface shaft shoulder 2-3 connect transition；Angle γ between shaft shoulder 2-3 and drill steel 2 axis is 1～10 °, preferably 4 °.
In order to improve the bending strength at drill steel 2 external screw thread ending, have at the aperture of tapped blind hole 1-2 in being adapted with shaft shoulder 2-3
Conical surface 1-3.In order to avoid causing because crossing positioning to interfere, only had when external thread section 2-1 and tapped blind hole 1-2 cooperation is tightened
The front end face 2-5 crossing section 2-4 is contacted with bottom hole 1-1 of tapped blind hole 1-2, and the male cone (strobilus masculinus) of shaft shoulder 2-3 not with tapped blind hole
Inner conical surface 1-3 contact at 1-2 aperture.
Embodiment 2
On the basis of above-described embodiment, this utility model can also adopt following structure: threaded in order to improve
Intensity, the connection screw thread of this utility model drilling tool adopts by trapezoidal thread with similar to corrugated thread, (form of thread is in wavy
Structure) compound thread that combines.That is: the form of thread of tapped blind hole 1-2 is by rectilinear female thread crest 3, curved
Spiral shell in two sections of linears that female thread tooth bottom 5 and one end are connected with female thread crest 3 with this tangent other end in female thread tooth bottom
Stricture of vagina tooth side 4 is constituted；Correspondingly, the form of thread of external thread section 2-1 is by rectilinear external screw thread tooth bottom 6, curved external screw thread
Two sections of linear external screw thread tooth sides 7 that crest 8 and one end are connected with external screw thread tooth bottom 6 with this tangent other end in external screw thread top
Constitute.Wherein, female thread tooth bottom 5 and external screw thread crest 8 both can be one section of circular arc, can also be oval, parabola or double
One section of curve on curve.In order to improve the intensity of screw thread further, female thread tooth bottom 5 and external screw thread crest 8 preferably with
That section of curve corresponding to ellipse short shaft.
Claims (6)
1. a kind of boring by percussion drilling tool, including the diaper body with cylindrical thread blind hole, the outer spiral shell by being located at leading portion position
The drill steel that stricture of vagina is connected with described tapped blind hole；It is characterized in that: drill steel (2) is the multidiameter structure with stage casing (2-2)；
The front end of external thread section (2-1) has diameter to be less than the cylindric changeover portion (2-4) of tapped blind hole (1-2), the length of this changeover portion
Distance with bottom hole (1-1) at screw-thread ending less than or equal to tapped blind hole (1-2)；External thread section (2-1) and stage casing (2-2)
Between by the conical surface shaft shoulder (2-3) connect transition, have, at the aperture of tapped blind hole (1-2), the inner conical surface being adapted with this shaft shoulder
(1-3)；The front end face (2-5) of changeover portion (2-4) and screw thread when external thread section (2-1) is tightened with tapped blind hole (1-2) cooperation
Bottom hole (1-1) contact of blind hole (1-2).
2. boring by percussion drilling tool according to claim 1 it is characterised in that: between the shaft shoulder (2-3) and drill steel (2) axis
Angle γ be 1～10 °.
3. boring by percussion drilling tool according to claim 2 it is characterised in that: described angle γ be 4 °.
4. the boring by percussion drilling tool according to claim 1 or 2 or 3 it is characterised in that: the screw thread of tapped blind hole (1-2)
Tooth form is tangent by rectilinear female thread crest (3), curved female thread tooth bottom (5) and one end and this female thread tooth bottom
Two sections of linear female thread teeth side (4) that the other end is connected with female thread crest (3) are constituted；The ridge of external thread section (2-1)
Type is tangent another by rectilinear external screw thread tooth bottom (6), curved external screw thread crest (8) and one end and this external screw thread top
Two sections of linear external screw thread teeth side (7) being connected with external screw thread tooth bottom (6) are held to constitute.
5. boring by percussion drilling tool according to claim 4 it is characterised in that: female thread tooth bottom (5) and external screw thread tooth
Top (8) is one section of curve on circular arc, ellipse, parabola or hyperbola.
6. boring by percussion drilling tool according to claim 5 it is characterised in that: female thread tooth bottom (5) and external screw thread tooth
Top (8) is that section of curve corresponding to ellipse short shaft.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620958076.XU CN205918370U (en) | 2016-08-29 | 2016-08-29 | Impacted style rock drilling brazing tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620958076.XU CN205918370U (en) | 2016-08-29 | 2016-08-29 | Impacted style rock drilling brazing tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205918370U true CN205918370U (en) | 2017-02-01 |
Family
ID=57868592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620958076.XU Withdrawn - After Issue CN205918370U (en) | 2016-08-29 | 2016-08-29 | Impacted style rock drilling brazing tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205918370U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106150395A (en) * | 2016-08-29 | 2016-11-23 | 贵州捷盛钻具股份有限公司 | Boring by percussion drilling tool |
| CN107386992A (en) * | 2017-09-01 | 2017-11-24 | 贵州迈锐钻探设备制造有限公司 | Have an opencast mining of drilling tool component and strip mining transformation drilling tool |
-
2016
- 2016-08-29 CN CN201620958076.XU patent/CN205918370U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106150395A (en) * | 2016-08-29 | 2016-11-23 | 贵州捷盛钻具股份有限公司 | Boring by percussion drilling tool |
| CN106150395B (en) * | 2016-08-29 | 2018-08-17 | 贵州捷盛钻具股份有限公司 | Boring by percussion drilling tool |
| CN107386992A (en) * | 2017-09-01 | 2017-11-24 | 贵州迈锐钻探设备制造有限公司 | Have an opencast mining of drilling tool component and strip mining transformation drilling tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170201 Effective date of abandoning: 20180817 |