CN101571035B - Sawtooth thread of drill pipe joint - Google Patents
Sawtooth thread of drill pipe joint Download PDFInfo
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- CN101571035B CN101571035B CN 200910147891 CN200910147891A CN101571035B CN 101571035 B CN101571035 B CN 101571035B CN 200910147891 CN200910147891 CN 200910147891 CN 200910147891 A CN200910147891 A CN 200910147891A CN 101571035 B CN101571035 B CN 101571035B
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- screw thread
- side angle
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- 238000005553 drilling Methods 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 abstract 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 210000002445 nipple Anatomy 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention relates to a drill pipe joint suitable for large-diameter raising-boring operation. The joint is formed by screwing an inner sawtooth thread and an outer sawtooth thread with conicity, thread pitch p between the inner thread and the outer thread is large (more than 10mm), tooth section is of a non-isosceles trapezoid structure, corners of the tooth section are chamfered respectively,side walls of the tooth section have the roughness Ra of 1.6, and width of crest of the inner thread is more than that of root of the outer thread; and the inner thread has a first flank angle of the inner thread and a second flank angle of the inner thread, the outer thread is arranged corresponding to the inner thread, and the outer thread has a first flank angle of the outer thread and a secon d flank angle of the outer thread. The sawtooth thread of the drill pipe joint integrates advantages of a rectangular thread such as high efficiency and a trapezoidal thread such as high tooth strength, and can bear greater lifting force and thrust as well as greater torque transmission action, thus being applicable to the large-diameter raising-boring operation.
Description
Technical field
The present invention relates to the joint of the anti-well drilling equipment of a kind of mining machinery, be specifically related to a kind of saw-tooth thread joint design of the novelty for raise boring machine major diameter drilling rod.
Background technology
At present the joint screw thread of raise boring machine drilling rod adopts the taper joint thread connecting mode of American Petroleum Institute (API) (API) standard more in the world, at the bottom of the tooth of this screw thread and crest all be flat V-structure.This joint screw thread designs for oil drilling, its main feature is strong for bearing ability, but because its anti-twisting property is little, especially in the application of anti-well drilling well major diameter tool joint thread, creep into required torque in order to reach, only have and select than major thread, thereby cause drill pipe diameter thick, cause the larger waste of drill rod materials, this joint screw thread shackle moment of torsion is large simultaneously, application life short, often occur in use that button-type damages or burn the button phenomenon, deficiency in economic performance can not satisfy the demand of Large Diameter Reverse well operations.
Swedish patent application SE515518 proposes a kind of drill string nipple that is specifically designed to percussive rock drilling.Wherein said pin thread and negative thread all are tapers, and at the bottom of the tooth of this thread contour and crest all have a radius of curvature greater than this thread pitch 30%.This screw thread can work in the drill string situation of elongated dimension satisfactorily, but goes wrong along with the increase of drill string size, causes the shortening in screw thread life-span.
Summary of the invention
For above problem, the present invention has designed a kind of zigzag joint screw thread structure of novelty of needs of suitable Large Diameter Reverse well drillng operation.
To achieve these goals, the joint screw thread structure of the needs of suitable Large Diameter Reverse well drillng operation of the present invention is screwed by the internal and external screw thread with novel structure and forms.
Tool joint zigzag internal thread of the present invention has tapering, pitch is the coarse pitch of p＞10mm, the tooth form cross section is isosceles trapezoidal structure not, corner's difference chamfering at tooth form, the sidewall of tooth form has the roughness of Ra=1.6, have internal thread the first tooth side angle α (40 °＜α＜50 °) and internal thread the second tooth side angle (10 °＜β＜20 °) at the bottom of the tooth of internal thread, internal thread the first tooth side angle is the labial teeth side angle, and internal thread the second tooth side angle is the backteeth side angle.Preferably, select internal thread the first tooth side angle α=45 °, internal thread the second tooth side angle=15 °.
External screw thread and the corresponding setting of described internal thread with same tapering, pitch is the coarse pitch of p＞10mm, and tooth form is isosceles trapezoid not, in the corner of tooth form chamfering respectively, the sidewall of tooth form has the roughness of Ra=1.6, and externally threaded crest has external screw thread the first tooth side angle α
1(40 °＜α
1＜50 °) and external screw thread the second tooth side angle
1(10 °＜β
1＜20 °), and the first tooth side angle and the second tooth side angle difference correspondent equal, i.e. α=α
1, β=β
1Correspondingly, external screw thread the first tooth side angle is the labial teeth side angle, is the backteeth side angle.Preferably, select external screw thread the first tooth side angle α
1=45 °, external screw thread the second tooth side angle
1=15 °.
Wherein said " tooth side angle " refers on form of thread, angle between the vertical line of screw thread side and drilling rod central axis, the direction of advance of drilling rod in when described " front " tooth side angle direction refers to that internal and external threads screws, described " afterwards " tooth side angle direction refers to the opposite direction of described " front " tooth side angle direction.
After tool joint screws, first (front) of internal and external threads and second (afterwards) tooth side angle are mutually corresponding, internal and external threads tooth bottom is separately divided and the mutually engaging of crest part, because the width of the internal thread crest width at the bottom of greater than the external screw thread tooth, has certain gap between at the bottom of crest, the tooth between the internal and external screw thread after the engaging, be more conducive to the shackle of joint, and can prevent effectively that impurity scratches thread surface in screwing process.
Sawtooth thread of drill pipe joint of the present invention is all improving a lot aspect bearing torque intensity, fatigue crack-resistant and the shackle efficient, it combines the high and trapezoidal-thread intensity advantages of higher of rectangular thread efficient, not only can bear larger lifting pulling force and thrust, but also can bear larger transmitting torque effect, be fit to the needs of Large Diameter Reverse well drillng operation.
Major advantage of the present invention has:
(1) coarse pitch.In the anti-well drilling operation course, reduced the time of the auxiliary screw thread of unloading, increased work efficiency;
(2) it is strong to bear ability.The face that bears of this screw thread and the angle that horizontal plane is large (10 °～20 °), after internal and external threads screwed, it is large that it bears area, greatly improved the ability that bears of drilling rod;
(3) the bearing torque ability is strong, prolongs the application life of drilling rod, thereby reduces cost.
Description of drawings
Below in conjunction with drawings and Examples the present invention is described in further detail.
Accompanying drawing 2 is sectional drawings of tool joint zigzag external screw thread tooth form of the present invention;
Accompanying drawing 3 is the generalized sections after the inside and outside saw-tooth thread of knock-off joint of the present invention screws.
1-tool joint external screw thread; 2-tool joint internal thread; 3-drill rod thread work plane
The specific embodiment
Fig. 1 has shown the tooth form longitudinal sectional drawing of tool joint zigzag internal thread 1, the remainder that omits drilling rod only shows the threaded part of its tool, its pitch is the coarse pitch of d=15.63mm, tapering is 1: 8, the tooth form of internal thread is isosceles trapezoid cross section structure not, the roughness of internal thread is Ra=1.6, and respectively at first, second tooth side two chamfers, the width of internal thread crest is C
1=4.509mm.Have internal thread the first tooth side angle α=45 ° and internal thread the second tooth side angle=15 ° at the bottom of the tooth of internal thread, internal thread the first tooth side angle is the labial teeth side angle, and internal thread the second tooth side angle is the backteeth side angle.
Fig. 2 has shown the tooth form longitudinal sectional drawing of the tool joint zigzag external screw thread 2 corresponding with Fig. 1, only show the threaded part of its tool, correspondingly wherein coarse pitch is d=15.63mm, tapering is 1: 8, externally threaded tooth form is isosceles trapezoid cross section structure not, externally threaded roughness is Ra=1.6, and respectively at first, second tooth side two chamfers, externally threaded tooth bottom width degree is C
2=4.177mm.Externally threaded crest has external screw thread the first tooth side angle α
1=45 ° and external screw thread the second tooth side angle
1=15 °.Correspondingly, external screw thread the first tooth side angle is the labial teeth side angle, and external screw thread the second tooth side angle is the backteeth side angle.
And, in the present invention, the first tooth side angle and the second tooth side angle correspondent equal, i.e. α=α
1, β=β
1
Fig. 3 has shown the cross-section illustration intention after tool joint internal thread 1 and external screw thread 2 screw.After screwing, first (front) of internal and external threads and second (afterwards) tooth side angle are mutually corresponding respectively, and the tooth bottom of internal and external threads is divided and partly respectively mutually engaging of crest, owing to the width C of internal thread crest
1Greater than the width C at the bottom of the external screw thread tooth
2, the gap between the internal and external screw thread after the engaging between at the bottom of crest, the tooth has the gap, this gap d=0.25mm.Therefore, the tooth form side is screw thread work plane 3.
Wherein " the tooth side angle " described in Fig. 1-3 refers on form of thread, angle between the vertical line of screw thread side and drilling rod central axis, the direction of advance of drilling rod in when described " front " tooth side angle direction refers to that internal and external threads screws, described " afterwards " tooth side angle direction refers to the opposite direction (with reference to Fig. 3) of described " front " tooth side angle direction.
Claims (5)
1. the tool joint of suitable Large Diameter Reverse well drillng operation needs, this joint is screwed by the zigzag internal and external screw thread with tapering and forms, the pitch of internal and external screw thread is the coarse pitch of p＞10mm, the tooth form cross section is isosceles trapezoidal structure not, and in the corner of tooth form chamfering respectively, the sidewall of tooth form has the roughness of Ra=1.6, it is characterized in that:
The crest width C of described internal thread
1Greater than described externally threaded tooth bottom width degree C
2
Described internal thread has internal thread the first tooth side angle α and internal thread the second tooth side angle, wherein 40 °＜α＜50 °, and 10 °＜β＜20 °;
Described external screw thread and described internal thread are corresponding to be arranged, and described external screw thread has external screw thread the first tooth side angle α
1With external screw thread the second tooth side angle
1, 40 °＜α wherein
1＜50 °, 10 °＜β
1＜20 °; And α=α
1, β=β
1
The tooth side angle refers on form of thread, the angle between the vertical line of screw thread side and drilling rod center line;
The first tooth side angle of wherein said internal and external screw thread is the labial teeth side angle, and the second tooth side angle of described internal and external screw thread is the backteeth side angle; The direction of advance of drilling rod in when labial teeth side angle direction refers to that internal and external threads screws, backteeth side angle direction refers to the opposite direction of described labial teeth side angle direction.
2. tool joint according to claim 1, wherein said internal and external screw thread pitch is p=15.63mm, described internal and external screw thread tapering is 1: 8.
3. the described tool joint of any one according to claim 1-2, the first tooth side angle of wherein said internal and external screw thread is 45 °, the second tooth side angle of described internal and external screw thread is 15 °.
4. tool joint according to claim 3, wherein said internal and external screw thread screws mutually, because the width C of internal thread crest
1Greater than the width C at the bottom of the external screw thread tooth
2, have the down suction between at the bottom of the crest between the internal and external threads after the engaging, the tooth.
5. tool joint according to claim 4, the down suction that has between at the bottom of the crest of wherein said internal and external threads, the tooth is d=0.25mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910147891 CN101571035B (en) | 2009-06-17 | 2009-06-17 | Sawtooth thread of drill pipe joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910147891 CN101571035B (en) | 2009-06-17 | 2009-06-17 | Sawtooth thread of drill pipe joint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101571035A CN101571035A (en) | 2009-11-04 |
| CN101571035B true CN101571035B (en) | 2013-02-27 |
Family
ID=41230494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910147891 Active CN101571035B (en) | 2009-06-17 | 2009-06-17 | Sawtooth thread of drill pipe joint |
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| Country | Link |
|---|---|
| CN (1) | CN101571035B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678068B (en) * | 2012-06-06 | 2015-06-03 | 中国石油集团渤海石油装备制造有限公司 | Toothed thread drill stem joint |
| CN103015913A (en) * | 2012-12-25 | 2013-04-03 | 江苏和信石油机械有限公司 | Exploration drill rod thread structure with 12-3/4-inch ultra-large caliber |
| CN103015914A (en) * | 2012-12-25 | 2013-04-03 | 江苏和信石油机械有限公司 | Exploration drill rod thread structure with 11-1/4-inch ultra-large caliber |
| CN103114816A (en) * | 2013-03-09 | 2013-05-22 | 长沙创远高新机械有限责任公司 | High load drill stem and raise boring machine with the same |
| CN104018788A (en) * | 2014-06-19 | 2014-09-03 | 上海海隆石油钻具有限公司 | Drill rod joint with thread profiles |
| CN105909185A (en) * | 2016-06-27 | 2016-08-31 | 无锡双马钻探工具有限公司 | Thread structure of drilling rod |
| CN105952390A (en) * | 2016-06-27 | 2016-09-21 | 无锡双马钻探工具有限公司 | Large-torque drill stem thread structure |
| CN107386991B (en) * | 2017-08-24 | 2023-05-09 | 连云港黄海勘探技术有限公司 | Direct-connection type rope core drill rod |
| US11199056B2 (en) * | 2019-02-06 | 2021-12-14 | James Jing Yao | Threaded coupling for percussion drill bit |
| CN114427485A (en) * | 2022-01-19 | 2022-05-03 | 中国航发沈阳发动机研究所 | Mounting structure for intermediate bearing of double-rotor turbofan engine |
-
2009
- 2009-06-17 CN CN 200910147891 patent/CN101571035B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN101571035A (en) | 2009-11-04 |
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