CN1306143C - Column surface loading pipe type drill rod - Google Patents
Column surface loading pipe type drill rod Download PDFInfo
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- CN1306143C CN1306143C CNB2003101038898A CN200310103889A CN1306143C CN 1306143 C CN1306143 C CN 1306143C CN B2003101038898 A CNB2003101038898 A CN B2003101038898A CN 200310103889 A CN200310103889 A CN 200310103889A CN 1306143 C CN1306143 C CN 1306143C
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- drill steel
- tubular type
- type drill
- drill
- drill rod
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Abstract
The present invention discloses a column surface loading pipe type drill rod. The diameter of the drill rod is more than 10% larger than that of a traditional drill rod with the same kind of specification, and the structure of the drill rod approximates to that of a column surface loading pipe type drill rod made by pipe-shaped materials of identical quality with equivalent weight of a drill rod of the same kind. The screw pair connection is adopted between pipe type drill rods, a rock drill and a drill bit, and between the pipe type drill rods, wherein a screw rod end head of the screw pair connection is a free surface in a working state, namely a hanging surface structure. A loading surface connected with the present invention by the screw pair can realize the stress wave perpendicular incidence of the drilling energy transmission of the column surface loading pipe type drill rod, and can ensure the reduction of the energy loss in the process of stress wave transmission. The diameter of the pipe type drill rod is obviously greater than that of a drill rod of the same kind, and the bending resistant section modulus is large, which causes fatigue bending to cycle at the level of low stress, and explores a new way of substantially raising the service life of drill rods.
Description
Technical field
The invention belongs to the supporting transmission energy instrument of rock drilling machinery, be specially adapted to the drill steel that various hammer drill use.
Background technology
Hammer drill is the most frequently used engineering equipment.The matched drill steel of all kinds of hammer drill, summary gets up to have three kinds, and (state's beech etc. are write, the design of drill rod, manufacturing and application, Hunan science tech publishing house, in October, 1988, P12-130): first taper connection drill steel is applicable to shallow bore hole, it relies on the hexagon shank collar to be connected with hammer drill, relies on the other end that has cone to be connected with bore bit.It two is screw connection drill rods, is applicable to the Drilling medium-length hole, by having the sleeve pipe of nut effect, drill steel is connected with hammer drill; The other end is connected with bore bit by the pin thread of drill steel termination; Along with the increase of hole depth, by sleeve pipe ground of drill steel is coupled together, cut a hole Kong Houzai and laid down one by one, so that from boring, take out bore bit.It three is MF drill steels, and promptly an end is a pin thread, and the other end is the drill steel of negative thread, and this screw thread drill steel connects has cancelled sleeve pipe.
The drill rod of these three kinds of structures in application practice for over 100 years more than a hundred years, has the following disadvantages (Song Shouzhi, Xu Xiaohe, the theory analysis in drill steel life-span, Acta Metallurgica Sinica, Vol.22 No5.P580):
1. taper connection drill steel, in manufacture process, its border, thermal treatment zone produces metallurgical breach, has changed the metallographic structure of drill steel, has caused the dangerous section of drill steel.
2. taper connection drill steel, in the rock drilling course of work, the taper connection place of drill steel and bore bit exists and endwisely slips, and frictional heat makes drill steel herein become the weak link of intensity; Because produce power dissipates, influence rock penetration performance simultaneously.
3. screw connection drill rod, when sleeve pipe is connected with two drill steels that are shaped on pin thread, its screw rod end face is exactly a bearing surface, though the contact end face of two drill steels is tightened by sleeve pipe, but the stress wave that hammer drill sends passes to negative thread on the sleeve pipe by active drill steel pin thread, passed to the pin thread of passive drill steel again by sleeve pipe, this process will experience the stress wave propagation effect twice.This stress wave propagation effect, belong to oblique incidence (Song Shouzhi writes, the stress wave in the solid dielectric, the Coal Industry Press, in June, 1989, P74-123).When stress wave incides on the screw thread inclined plane, as shown in Figure 1, incidence wave W produces four new ripples in the drill steel: one is reflected P-wave C, and it two is reflection wave D, and it three is transmitted P-wave E, and it four is transmitted shear wave F.One and its two new ripple are runed counter to the direction of transfer of incidence wave, and will carry about 5-15% energy passes the opposite direction to rock drill bit, have only its three and its "four news" (new ideas wave direction the transmission of bore bit direction.The rock drilling stress wave is every through a drill steel joint, its energy loss be 10-25% (Xu Xiaohe writes, catalase, the Coal Industry Press, in November, 1986, P176)
4.MF the defective of drill steel is, is to connect the terminal negative thread of another root drill steel by the terminal pin thread of drill steel to realize the energy transmission though transmit the hammer drill energy.Wherein the top end face of pin thread holds out against the bottom surface of negative thread.Because splicing sleeve has been saved in the centre, in fact only produces the oblique incidence effect of primary stress ripple, its energy loss is 10～15%.
5. above-mentioned three kinds of supporting drill steels of hammer drill, the bearing surface of transmission rock drilling stress wave, as shown in Figure 2, by the taper of taper connection drill steel; Perhaps pass through the masthead end face of pin thread, as shown in Figure 3; Perhaps pass through the nut bottom surface of MF drill steel, as shown in Figure 4.This energy of assembling with the bearing surface center digs into moment of rock acting at hammer drill, and the vertical incidence point of stress wave occurs in the bore bit center, and what make that the bore bit center obtains digs into rock energy maximum; All the other each positions of bore bit all produce oblique incidence, and what obtained digs into the rock energy, and along with distance bore bit centre distance increases, its quantity is more and more littler, this acquire dig into Energy distribution and fractured rock institute energy requirement is runed counter to.
6. the dangerous section of taper connection drill steel is the metallurgical indentation, there that is positioned at apart from the about 200mm of drill steel striking face place.For screw connection drill rod, comprising the MF drill steel, its dangerous section is the bottom diameter place of male threaded terminal.According to the failure mode of drill steel be wet type flexural fatigue (Song Shouzhi, Xu Xiaohe estimate the drill steel Research of Fatigue Life with computer, iron and steel, Vol.22 No.3, P1-5), its flexural stress:
σ＝M/W (A)
M is a drill steel carrying moment of flexure in the formula; W is the bending resistant section coefficient of drill steel.For hollow drill steel bending resistant section coefficient (editorial board, mechanical engineer's handbook, China Machine Press, in July, 1989, P4-119):
W＝0.0982×(D
4-d
4)/D (B)
In the formula, D is the external diameter of drill steel dangerous section; D is the drill steel diameter of bore.For following formula,, think W ∝ D so can be similar to because of the d size of traditional drill steel is generally very little
3Analyze theoretically, the inner radius D minimum of drill steel pin thread is checked according to flexural stress, W minimum herein, and by formula (A) as can be known: σ maximum herein is a dangerous section.Thereby can inference: the size that strengthens the outer diameter D at drill steel dangerous section place as far as possible, to significantly reduce this that determine according to (A) formula and locate tired flexural stress level, can significantly improve the anti-fatigue ability of drill steel like this, this improves the optimal path in drill rod life-span beyond doubt.Inference thus, for traditional hollow drill steel, after outer diameter D increases as far as possible, but the limit size that D increases should be less than drill bit diameter 6～10mm, and its section configuration has just become tubulose like this.This drill steel pattern reply bending resistance fatigue is undoubtedly the most effective a kind of actual step.
Summary of the invention
The purpose of this invention is to provide a kind of minimizing and transmit the consumption of rock drilling energy, efficient, lightweight and long-life drill steel, to break through the traditional drill rod tactic pattern of current drilling tool industry
A kind of cylinder carrying tubular type drill steel of the present invention, described drill steel than the diameter of traditional similar specification drill steel greater than more than 10%, and carry tubular type drill steel structure with the cylinder that the homogeneity tubular material of similar drill steel equivalent weight is made, between described tubular type drill steel and hammer drill, the bore bit, between the tubular type drill steel, adopt screw pair to connect, the screw end head during described screw pair connects, all be the scope of freedom down in working order, a promptly unsettled structure.
Aforesaid a kind of cylinder carrying tubular type drill steel, drill steel be diameter greater than 30mm, and diameter is less than the drill bit diameter 6-10mm that cooperates with it, wall thickness is less than the light-wall pipe structure of 25mm.
Aforesaid a kind of cylinder carrying tubular type drill steel, that screw pair adopts is square, a kind of structure in zigzag, waveform and the trapezoidal thread.
Aforesaid a kind of cylinder carrying tubular type drill steel, minor diameter taper connection drill steel adopts whole tubular type thread connecting mode, will be wherein an end make thin-walled outer-hexagonal shank collar and be connected with hammer drill, its other end relies on screw pair to be connected with bore bit, its carrying work plane or tubular type drill steel end face, or the threaded male screw thread undercut end face of tubular type drill steel.
Aforesaid a kind of cylinder carrying tubular type drill steel, tubular type drill steel screw pair adopts the local wall thickness jumping-up structure of thin-walled socket drill steel, and its two ends are respectively the yin, yang screw threads; Or adopt the thick-wall tube structure, and behind the yin, yang screw thread of turned bolt pair, adopt protection welding measure, it is welded to the two ends of the tubular type drill steel body of rod respectively.
Aforesaid a kind of cylinder carrying tubular type drill steel is the tubular type drill steel that is threaded of pin thread for the bore bit afterbody, and the end face of drill steel body negative thread is bearing surface, i.e. locking face; For the bore bit afterbody is the tubular type drill steel that is threaded of negative thread, and the end face at pin thread end of a period place undercut position is a bearing surface.
The present invention compares with traditional drill steel structure, has following advantage and good effect:
1. the tubular type drill steel of being studied, the MF drill steel of having sublated relies on pin thread to hold out against traditional mode of transfer force of nut bottom surface, as shown in Figure 4, the present invention structurally guarantees to transmit cylinder carrying in the screw pair, shown in Fig. 5,6,7 and 8, make the screw end head of pin thread unsettled, rely on screw pair that two bearing surfaces between drill steel are tightened, realize the vertical incidence of stress wave, each drill steel joint energy loss can be reduced to below 5%, and the hammer drill cutting rate is accelerated, and drilling depth obviously increases.
2. because tubular type drill steel external diameter increases more than 10% than traditional drill steel diameter, and after the external diameter of dangerous section increased, its bending resistant section coefficient strengthened, make tired crooked horizontal cocycle, then can significantly improve the application life of tubular type drill steel at low stress.
Further set forth characteristics of the present invention below by example:
Example 1 minor diameter tubular type drill steel
Minor diameter tubular type drill steel experimental data
| Group | Specification | Drill bit diameter | Connected mode | Rock consolidating coefficient f | Cutting rate (time/rice) | The drill steel life-span (rice/root) | Failure mode |
| Invention | Φ34 | Φ40 | T26 | 12-14 | 1 minute 50 seconds | 208 | Wearing and tearing |
| Contrast | H22 | Φ40 | Taper | 12-14 | 2 minutes 35 seconds | 86 | *, * * fracture |
Example 2 extension bar formula tubular type drill steels
Extension bar tubular type drill steel experimental data
| Group | Specification | Drill bit diameter | Connected mode | Rock consolidating coefficient f | Cutting rate (time/rice) | The drill steel life-span (rice/root) | Failure mode |
| Invention | Φ55 | Φ76 | T45 | 12-14 | 2 minutes 40 seconds | 1200 | Wearing and tearing |
| Contrast | Φ32 | Φ70 | R32 | 12-14 | 3 minutes 20 seconds | 750 | The fracture of screw thread place *, * * |
* Song keeps will etc., estimates drill steel Research of Fatigue Life [J], iron and steel, 1986 (3): 30-34 with computer.
* opens state's beech etc. and writes, " design of drill rod, make and select for use ", Hunan science tech publishing house, 1988.10, P146～156.
Description of drawings
Fig. 1 is the transmission effects schematic diagram of stress wave on thread surface;
Fig. 2 is a kind of traditional connected mode structural representation of drilling tool center focused energy;
Fig. 3 is another kind of traditional connected mode structural representation of drilling tool center focused energy;
Fig. 4 is the third traditional connected mode structural representation of drilling tool center focused energy;
Fig. 5 is the cylinder tubular type drill steel structural representation that is developed by taper connection of the present invention;
Fig. 6 is that of the present invention being threaded is connected the tubular type drill steel structural representation of drill steel differentiation with MF;
Fig. 7 is the tubular type drill steel structural representation of the pin thread of bore bit afterbody of the present invention;
Fig. 8 is the tubular type drill steel structural representation that bore bit afterbody of the present invention is dark screw thread.
The specific embodiment
Fig. 1 reflection be the transmission effects schematic diagram of stress wave on thread surface, wherein W be incidence wave, C be reflected P-wave, D be reflection wave, E be suitablely penetrate compressional wave, F is a transmitted shear wave.Fig. 2,3, the 4th, traditional bore bit connects schematic diagram, and wherein 1 is bore bit, the 2nd, and drill steel, 3-1,3-2,3-3 are bearing surfaces.
Main technical schemes of the present invention:
1. the drill steel of taper connection is changed into and being threaded, this structure drill steel as shown in Figure 5.Wherein drill steel 2 one ends are connected with hammer drill with the hexagonal shank collar, and the other end of drill steel 2 is connected with bore bit 1 by screw thread.3-4 is a bearing surface among Fig. 5.
2. to common screw connection drill rod and MF drill steel, substantial change is: the external diameter that strengthens the tubular type drill steel as far as possible, usually its diameter lower limit is greater than 30mm, its diameter upper limit is less than drill bit diameter 6-10mm, and guarantee that structurally tubular type drill steel cylinder is the bearing surface 3-5 of effects of stress wave, as shown in Figure 6.
3. the bearing surface upper stress ripple transmission effects that proposes of the technical program is a vertical incidence, and reflection moment only generates a reflected P-wave and a transmitted P-wave, and energy loss is below 5%; Support on the hammer drill bore bit because the stress wave of cylinder carrying passes, can make stress wave vertical incidence point occur in the bore bit outer rim, what can guarantee to obtain digs into the rock energy and digs into the required energy of rock and be complementary; And check the flexural stress of dangerous section, and the cube that is bordering on tubular type bearing surface external diameter is inversely proportional to, and then safety factor significantly improves.
Concrete manufacture method of the present invention may further comprise the steps:
1. will have the steel of the hexagonal hollow or the cylinder hollow of specification now, its shape all change into be bordering on equivalent weight diameter greater than the tubular type steel more than the 30mm.
2. tubular type drill steel wall thickness is less than 25mm.
3. the minor diameter drill steel (generally including hexagonal drill steel specifications such as B22, B25, B35) of taper connection is changed into and being threaded, promptly an end of drill steel 2 is connected with hammer drill with the hexagonal shank collar, and its other end is connected with bore bit 1 with screw pair, and its structure is referring to Fig. 5.When bore bit 1 body afterbody was pin thread, structure design guaranteed that drill steel 2 body of rod end faces are for transmitting the bearing surface 3-6 of stress wave, as shown in Figure 7.When bore bit body afterbody was negative thread, structure design guaranteed that the end face at tubular type drill steel pin thread end of a period place undercut position is bearing surface 3-7, as shown in Figure 8.
4. the drill steel that is threaded for employing, MF drill steel comprising existing use, develop into diameter greater than 30mm tubular type drill steel, wall thickness guarantees in its structure design that less than 25mm the plane, termination of its negative thread of tubular type drill steel or the end face at its pin thread end of a period place undercut position are the bearing surface that transmits stress wave.For the screw thread position, two of its drill steel, as shown in Figure 7 with shown in Figure 8, can adopt local wall thickness jumping-up with thin-walled socket drill steel material, distinguish car system positive and negative screw thread again; Perhaps use thick-wall tube, the positive and negative screw thread of turned bolt pair then adopts protection welding measure respectively, and it is welded to the two ends of tubular type drill steel body respectively.3-6,3-7 are bearing surface among Fig. 7,8.
5. the tubular type drill steel adopts screw pair to connect, and that its screw thread kind can be divided into is square, zigzag, waveform and trapezoidal thread; Its screw tip face remains unsettled (being the scope of freedom) in connection procedure.
6. the Metallic Materials and Heat Treatment system that does not change traditional drill steel and adopted.
Claims (6)
1. a cylinder carries the tubular type drill steel, it is characterized in that: described drill steel is bigger more than 10% than the diameter of traditional similar specification drill steel, employing is made cylinder carrying tubular type drill steel structure with the tubular material that traditional drill steel has equivalent weight, homogenous quantities material, between described tubular type drill steel and hammer drill, the bore bit, between the tubular type drill steel, adopt screw pair to connect, the screw end head during described screw pair connects, all be the scope of freedom down in working order, a promptly unsettled structure.
2. a kind of cylinder carrying tubular type drill steel as claimed in claim 1 is characterized in that: drill steel be diameter greater than 30mm, and diameter is less than the drill bit diameter 6-10mm that cooperates with it, wall thickness is less than the light-wall pipe structure of 25mm.
3. a kind of cylinder carrying tubular type drill steel as claimed in claim 1 is characterized in that: screw pair adopts a kind of structure in square, zigzag, waveform and the trapezoidal thread.
4. a kind of cylinder carrying tubular type drill steel as claimed in claim 1, it is characterized in that: minor diameter taper connection drill steel adopts whole tubular type thread connecting mode, will be wherein an end make thin-walled outer-hexagonal shank collar and be connected with hammer drill, its other end relies on screw pair to be connected with bore bit, its carrying work plane or tubular type drill steel end face, or the threaded male screw thread undercut end face of tubular type drill steel.
5. a kind of cylinder carrying tubular type drill steel as claimed in claim 1, it is characterized in that: tubular type drill steel screw pair adopts the local wall thickness jumping-up structure of thin-walled socket drill steel, and its two ends are respectively the yin, yang screw threads; Or adopt the thick-wall tube structure, and behind the yin, yang screw thread of turned bolt pair, adopt protection welding measure, it is welded to the two ends of the tubular type drill steel body of rod respectively.
6. a kind of cylinder carrying tubular type drill steel as claimed in claim 1, it is characterized in that: be the tubular type drill steel that is threaded of pin thread for the bore bit afterbody, the end face of drill steel body negative thread is a bearing surface, it is locking face, for the bore bit afterbody is the tubular type drill steel that is threaded of negative thread, and the end face at pin thread end of a period place undercut position is a bearing surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101038898A CN1306143C (en) | 2003-11-20 | 2003-11-20 | Column surface loading pipe type drill rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101038898A CN1306143C (en) | 2003-11-20 | 2003-11-20 | Column surface loading pipe type drill rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1619095A CN1619095A (en) | 2005-05-25 |
| CN1306143C true CN1306143C (en) | 2007-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101038898A Expired - Fee Related CN1306143C (en) | 2003-11-20 | 2003-11-20 | Column surface loading pipe type drill rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1306143C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107386992B (en) * | 2017-09-01 | 2023-04-25 | 贵州迈锐钻探设备制造有限公司 | Surface mining drill tool assembly and surface mining drill tool |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1477855A (en) * | 1922-04-18 | 1923-12-18 | Fred W Thurston | Drill |
| EP0354887A1 (en) * | 1988-07-08 | 1990-02-14 | Sandvik Aktiebolag | Method to establish a thread coupling |
| CN1064733C (en) * | 1995-03-27 | 2001-04-18 | 桑德维克公司 | Rock drilling tool, drill bit and method of transferring percussive energy |
-
2003
- 2003-11-20 CN CNB2003101038898A patent/CN1306143C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1477855A (en) * | 1922-04-18 | 1923-12-18 | Fred W Thurston | Drill |
| EP0354887A1 (en) * | 1988-07-08 | 1990-02-14 | Sandvik Aktiebolag | Method to establish a thread coupling |
| US4968068A (en) * | 1988-07-08 | 1990-11-06 | Sandvik Ab | Thread coupling for drill string members |
| CN1064733C (en) * | 1995-03-27 | 2001-04-18 | 桑德维克公司 | Rock drilling tool, drill bit and method of transferring percussive energy |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1619095A (en) | 2005-05-25 |
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Granted publication date: 20070321 Termination date: 20091221 |