CN203742461U - Drill bit for soft coal bed gas extraction drill protection of underground coal mine - Google Patents
Drill bit for soft coal bed gas extraction drill protection of underground coal mine Download PDFInfo
- Publication number
- CN203742461U CN203742461U CN201420039016.9U CN201420039016U CN203742461U CN 203742461 U CN203742461 U CN 203742461U CN 201420039016 U CN201420039016 U CN 201420039016U CN 203742461 U CN203742461 U CN 203742461U
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- Prior art keywords
- tooth
- drill bit
- tooth sheet
- drill
- guard aperture
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- Expired - Lifetime
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- 239000003245 coal Substances 0.000 title claims abstract description 28
- 238000000605 extraction Methods 0.000 title abstract description 4
- 238000005520 cutting process Methods 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 11
- 239000010432 diamond Substances 0.000 claims abstract description 11
- 238000005553 drilling Methods 0.000 claims description 20
- 238000005086 pumping Methods 0.000 claims description 14
- 239000011159 matrix material Substances 0.000 claims description 13
- 238000005476 soldering Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 abstract 2
- 230000007306 turnover Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 230000005389 magnetism Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical group [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Earth Drilling (AREA)
Abstract
The utility model provides a drill bit for soft coal bed gas extraction drill protection of an underground coal mine, and belongs to drill bits for drill protecting pipe penetrating. Three centrosymmetric cutting main wings are arranged outside a drill bit body, a slagging concave surface is arranged between every two cutting main wings, and each slagging concave surface is provided with a slagging air hole; the center of the drill bit body is an unidiameter inner hole, the top end of the inner hole is lower than the cutting main wings, an inclined table top is arranged between the hole port of the inner hole and each slagging concave surface, each inclined concave surface is provided with a tooth piece groove and a pin column groove, and each tooth piece groove vertically intersects the corresponding pin column groove in the horizontal plane; one tooth piece close to the inner hole side is suspended, the back surface of the tooth piece is provided with a polycrystalline diamond composite piece, and the bottom surface of the tooth piece is provided with a magnetic block; one tooth piece far away from the inner hole side is fixed in the corresponding tooth piece groove through a pin column. The tooth pieces are attracted to the body by means of magnetic force; when a drill protecting pipe penetrates, the tooth pieces turn over by means of pushing force of the pipe, and therefore drill protecting pipe can penetrate smoothly. The drill bit solves the problems that according to a soft coal bed gas extraction drill, penetrating efficiency of the drill protecting pipe is low, and the technology is complex.
Description
Technical field
The utility model relates to the logical effective drill bit of guard aperture pipe of a kind of boring, especially a kind of soft coal bed in coal mine mash gas pumping drilling guard aperture drill bit.
Technical background
Prevent that coal and Gas Outburst from being the vital task that China's coal-mine faces, country's < < coal mine gas drainage temporary provisions 2012 > > up to standard require the serious mine of Gas Disaster must carry out gas pumping, and it is up to standard to realize extraction.Weak seam gas pumping method is less at present, is mainly to take concordant hole as main.But weak seam hardness number, boring is out of shape, the situation of caving in is serious, causes gas pumping to lose efficacy, and has seriously hindered gas control progress up to standard, causes a large amount of manpowers, financial resource waste simultaneously.For this reason, domestic many scholars have proposed to be lowered to guard aperture screen casing in boring with the method for opposing boring distortion, the inefficacy of caving in.Chinese patent (the patent No.: CN101446178A) disclose the soft projecting coal bed Wind pressure air drilling technique in a kind of down-hole: do not move back brill after Completion of Drilling Hole, to drill pipe bore, push guard aperture pipe, door when guard aperture pipe arrives drill bit on roof bit, make to be arranged in the spring catch compression of bit matrix, thereby make door separated with carcass, guard aperture pipe enters in boring then.The method can solve the difficult problem that guard aperture pipe passes through at drill bit place, but in practical application due to the impact of the factor such as the ickings of drilling, drilling tool high temperature, complicated geological, spring pin hole is easily blocked by ickings, often runs into a difficult problem of opening failure, causes whole boring guard aperture technique failure.
In order to solve weak seam guard aperture problem, the authorized Chinese patent of applicant (patent No. ZL201210056522.4), this patent discloses weak seam mash gas pumping drilling cooperating type brill and has protected integral system and technique, abundant and perfect as this system, for guard aperture pipe, by the problem of drill bit difficulty, special application discloses a kind of soft coal bed in coal mine mash gas pumping drilling guard aperture drill bit.
Utility model content
The purpose of this utility model is that a kind of soft coal bed in coal mine mash gas pumping drilling guard aperture drill bit will be provided, and solves guard aperture pipe and through drill bit, enters a difficult problem for boring.
The purpose of this utility model realizes in the following manner: this drill bit comprises magnet piece, tooth sheet, pin, bit matrix and composite polycrystal-diamond; Bit matrix outer setting has three centrosymmetric cutting main wings, between three cutting main wings, has a deslagging concave surface, respectively has a deslagging venthole on each deslagging concave surface; The center of bit matrix is an isodiametric endoporus, the top height of endoporus is lower than the height of cutting main wing, between bore orifice and each deslagging concave surface, have an inclined table, be provided with a tooth film trap and a pin groove on each inclined table, both intersect vertically on horizontal plane; The length of tooth sheet is greater than the length of tooth film trap, and unsettled near the tooth sheet of endoporus side, its back side is provided with a composite polycrystal-diamond, and its bottom surface is provided with magnet piece.
Described tooth sheet, has a pin hole at the tooth sheet away from endoporus side, by pin, is passed; Between the bottom surface of the bottom surface of tooth sheet and tooth film trap, there is spacing; The length of pin is greater than the width of tooth sheet, and the two ends of pin are fixed in pin groove by the mode of welding.
Described tooth film trap is class cuboid, and its bottom surface and endoporus wall surface of the hole intersect; Tooth sheet groove depth is 10 ~ 15mm, and width is 15 ~ 20mm, and three tooth film traps are hexagonal angle and are distributed on level reference.
Described pin groove is cuboid, and its bottom surface is higher than tooth sheet groove bottom, with pin hole bottom in same level.
Described composite polycrystal-diamond adopts the mode of soldering to be welded to the back of tooth sheet, and its cut surface is horizontal by 5 ~ 10 ° of angles.
Described magnet piece is neodymium iron boron material, and width is less than tooth sheet width, and its length is less than tooth sheet suspended length, and thickness is not more than 8mm.
The utlity model has following effect:
1) tooth sheet is adsorbed on bit matrix by magnet piece, can ensure that tooth sheet can not pressed wind to wash open when normally drilling, and can be backed down by guard aperture pipe simultaneously.With respect to other mechanical switch, by Magnetic Control, can avoid the mechanical failure that in the process of drilling, the impact of the factor such as ickings, geological conditions causes like this.
2) the magnetic force size of magnet piece can be controlled by regulating magnet intensity and area, and the mode that magnet area can cut by line is processed, so in actual production, can guarantee that its magnetic attraction reaches the requirement of formula (1).
accompanying drawing explanation:
Fig. 1 is drill bit plan structure figure of the present utility model.
Fig. 2 is the drill bit plan structure figure of the unassembled composite sheet of the utility model and tooth sheet.
Fig. 3 is the main TV structure figure of drill bit of the present utility model.
Fig. 4 is the main TV structure figure of tooth sheet of the present utility model.
In figure, 1, tooth sheet; 2, pin; 3, deslagging pore; 4, composite polycrystal-diamond; 5, bit matrix; 6, endoporus; 7, deslagging concave surface; 8, inclined table; 9, pin groove; 10, tooth film trap; 11, cutting main wing; 12, magnet piece; 13 pin hole.
the specific embodiment
Below in conjunction with accompanying drawing, an embodiment of the present utility model is further described:
Embodiment 1: construction drill diameter is 89mm, hole depth 100m, and bit matrix diameter is 89mm, and diameter of bore is 39mm, and when drill bit creeps into, endoporus blast is 0.2MPa.Drill bit is comprised of magnet piece 12, tooth sheet 1, pin 2, bit matrix 5 and composite polycrystal-diamond 4.Wherein bit matrix 5 outer setting have between 11, three cutting main wings 11 of three centrosymmetric cutting main wings and have a deslagging concave surface 7, respectively have a deslagging pore 3 on each deslagging concave surface 7.The center of bit matrix 5 is isodiametric endoporus, the top height of endoporus is lower than the height of cutting main wing 11, between bore orifice and each deslagging concave surface 7, there is an inclined table 8, on each inclined table 8, be provided with a tooth film trap 10 and a pin groove 9, both intersect vertically on horizontal plane.The length of tooth sheet 1 is greater than the length of tooth film trap 10, and unsettled near the tooth sheet 1 of endoporus side, its back side is provided with a composite polycrystal-diamond 4, and its bottom surface is provided with magnet piece 12.Tooth sheet 1 away from endoporus side has a pin hole 13, by pin 2, is passed.Between the bottom surface of the bottom surface of tooth sheet 1 and tooth film trap 10, there is spacing.The length of pin 2 is greater than the width of tooth sheet 1, and the two ends of pin 2 are fixed in pin groove 9 by the mode of welding.
In Fig. 1, described composite polycrystal-diamond 4 adopts the mode of soldering to be welded to the back of tooth sheet 1, and its cut surface is horizontal by 10 ° of angles.
Described tooth sheet 1 width is 18mm, with the distinguished and admirable contact area of endoporus be 3 * 320mm
2.
In Fig. 2, described tooth film trap 10 is class cuboid, and its bottom surface and endoporus wall surface of the hole intersect.Tooth film trap 10 degree of depth are 12mm, and width is 20mm, and three tooth film traps are hexagonal angle and are distributed on level reference.
Described pin groove 9 is cuboid, and its bottom surface is higher than tooth film trap 10 bottom surface 8mm, with pin hole 13 bottoms in same level.
In Fig. 4, described magnet piece 12 is neodymium iron boron material, and width is less than tooth sheet 1 width, and its length is less than tooth sheet 1 suspended length, and thickness is not more than 8mm.Its magnetic force size is determined by formula (1).
(1)
F in formula
g---the guard aperture pipe thrust that the external world provides, N;
F
s---magnetic attraction, N;
F
cmax---send pipe resistance, N;
P
s---blast in drilling rod, MPa;
β---tooth sheet placement angle, °;
W
e0---the weight of every meter of guard aperture pipe, kg/m;
μ---guard aperture pipe is at the friction factor of drill pipe bore, constant;
H---hole deviation section or horizontal segment be length separately, m;
---dip angle of hole, °;
α---hole deviation section central angle, °;
S---tooth sheet gos deep into drill bit endoporus pressurized wind active area, m
2.
The radius of curvature of R---bending section
Magnetic force power size computational process:
First determine that required maximum is sent pipe resistance when drilling track send pipe: boring, getting bending section length is 80m, and horizontal segment is 20m, gets crooked central angle and is, radius of curvature is 0.8, dip angle of hole is, friction factor is 0.2, in conjunction with obtaining in on-the-spot actual parameter substitution (1):
Draw F
cmax=1.15kN, gets F
g=1.3kN, P
sscos β=0.02kN, determines magnetic attraction F
s=0.1kN is 2.083MPa to magnetism intensity.
Therefore,, for the area in conjunction with tooth sheet, select the ndfeb magnet that magnetism intensity is 2.083MPa.Or adopt magnetized mode, the material that is magnetized is magnetized into the state that magnetism intensity is 2.083MPa.
Claims (6)
1. a soft coal bed in coal mine mash gas pumping drilling guard aperture drill bit, is characterized in that: this drill bit comprises magnet piece, tooth sheet, pin, bit matrix and composite polycrystal-diamond; Bit matrix outer setting has three centrosymmetric cutting main wings, between three cutting main wings, has a deslagging concave surface, respectively has a deslagging venthole on each deslagging concave surface; The center of bit matrix is an isodiametric endoporus, the top height of endoporus is lower than the height of cutting main wing, between bore orifice and each deslagging concave surface, have an inclined table, be provided with a tooth film trap and a pin groove on each inclined table, both intersect vertically on horizontal plane; The length of tooth sheet is greater than the length of tooth film trap, and unsettled near the tooth sheet of endoporus side, its back side is provided with a composite polycrystal-diamond, and its bottom surface is provided with magnet piece.
2. a kind of soft coal bed in coal mine mash gas pumping drilling guard aperture drill bit according to claim 1, is characterized in that: described tooth sheet, at the tooth sheet away from endoporus side, there is a pin hole, and by pin, passed; Between the bottom surface of the bottom surface of tooth sheet and tooth film trap, there is spacing; The length of pin is greater than the width of tooth sheet, and the two ends of pin are fixed in pin groove by the mode of welding.
3. a kind of soft coal bed in coal mine mash gas pumping drilling guard aperture drill bit according to claim 1, is characterized in that: described tooth film trap is class cuboid, and its bottom surface and endoporus wall surface of the hole intersect; Tooth sheet groove depth is 10 ~ 15mm, and width is 15 ~ 20mm, and three tooth film traps are hexagonal angle and are distributed on level reference.
4. a kind of soft coal bed in coal mine mash gas pumping drilling guard aperture drill bit according to claim 1, is characterized in that: described composite polycrystal-diamond adopts the mode of soldering to be welded to the back of tooth sheet, and its cut surface is horizontal by 5 ~ 10 ° of angles.
5. a kind of soft coal bed in coal mine mash gas pumping drilling guard aperture drill bit according to claim 1, is characterized in that: described pin groove is cuboid, and its bottom surface is higher than tooth sheet groove bottom, with pin hole bottom in same level.
6. a kind of soft coal bed in coal mine mash gas pumping drilling guard aperture drill bit according to claim 1, is characterized in that: described magnet piece width is less than tooth sheet width, and its length is less than tooth sheet suspended length, and thickness is not more than 8mm; Its magnetic force size is determined by following formula:
F in formula
g---the guard aperture pipe thrust that the external world provides, N;
F
s---magnetic attraction, N;
F
cmax---send pipe resistance, N;
P
s---blast in drilling rod, MPa;
β---tooth sheet placement angle, °;
W
e0---the weight of every meter of guard aperture pipe, kg/m;
μ---guard aperture pipe is at the friction factor of drill pipe bore, constant;
H---guard aperture pipe overall length, m;
θ---dip angle of hole, °;
α---hole deviation section central angle, °;
S---tooth sheet gos deep into drill bit endoporus pressurized wind active area, m
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420039016.9U CN203742461U (en) | 2014-01-22 | 2014-01-22 | Drill bit for soft coal bed gas extraction drill protection of underground coal mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420039016.9U CN203742461U (en) | 2014-01-22 | 2014-01-22 | Drill bit for soft coal bed gas extraction drill protection of underground coal mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203742461U true CN203742461U (en) | 2014-07-30 |
Family
ID=51342278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420039016.9U Expired - Lifetime CN203742461U (en) | 2014-01-22 | 2014-01-22 | Drill bit for soft coal bed gas extraction drill protection of underground coal mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203742461U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758462A (en) * | 2014-01-22 | 2014-04-30 | 平顶山天安煤业股份有限公司 | Drill bit for coal mine underground soft coal seam gas extraction drill hole protection |
| CN106869798A (en) * | 2017-03-30 | 2017-06-20 | 河南理工大学 | The drilling guard aperture method of weak seam mash gas pumping drilling guard aperture drilling tool |
-
2014
- 2014-01-22 CN CN201420039016.9U patent/CN203742461U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758462A (en) * | 2014-01-22 | 2014-04-30 | 平顶山天安煤业股份有限公司 | Drill bit for coal mine underground soft coal seam gas extraction drill hole protection |
| CN106869798A (en) * | 2017-03-30 | 2017-06-20 | 河南理工大学 | The drilling guard aperture method of weak seam mash gas pumping drilling guard aperture 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 |
Granted publication date: 20140730 Effective date of abandoning: 20151230 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140730 Effective date of abandoning: 20151230 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |