CN111810057A - Use method of advancing type full-automatic controllable reducing pressure relief connecting rod drill bit structure - Google Patents
Use method of advancing type full-automatic controllable reducing pressure relief connecting rod drill bit structure Download PDFInfo
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- CN111810057A CN111810057A CN202010639108.0A CN202010639108A CN111810057A CN 111810057 A CN111810057 A CN 111810057A CN 202010639108 A CN202010639108 A CN 202010639108A CN 111810057 A CN111810057 A CN 111810057A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 71
- 238000007599 discharging Methods 0.000 claims abstract description 39
- 238000005553 drilling Methods 0.000 claims abstract description 28
- 239000000178 monomer Substances 0.000 claims abstract description 23
- 239000003245 coal Substances 0.000 claims abstract description 19
- 239000011435 rock Substances 0.000 claims description 68
- 238000010276 construction Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 238000005065 mining Methods 0.000 abstract description 8
- 230000009471 action Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 2
- 230000036346 tooth eruption Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
- E21B10/627—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable with plural detachable cutting elements
- E21B10/633—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable with plural detachable cutting elements independently detachable
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/16—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using gaseous fluids
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- Earth Drilling (AREA)
Abstract
The invention discloses a use method of a forward type full-automatic controllable reducing pressure relief connecting rod drill bit structure, and belongs to the field of drilling pressure relief in coal mining or metal mining. The drill bit structure comprises a crushing exhaust tooth cutting part, a detachable tooth cutting part and a spiral powder discharge end cover part which are sequentially connected from front to back; the crushing exhaust cutting pick part comprises a crushing exhaust cutting pick body, wherein an axial crushing tooth, a radial cutting pick I and a gas guide hole are respectively arranged on the crushing exhaust cutting pick body, and the gas guide hole is positioned in the center of the crushing exhaust cutting pick body; the detachable cutting tooth part is formed by sequentially connecting a plurality of groups of detachable cutting tooth monomers, the powder discharging cutting tooth monomers are arranged in a triangular prism shape for convenience, the spiral powder discharging end cover part comprises a spiral powder discharging end cover main body, and a spiral powder discharging groove and an air inlet hole are formed in the spiral powder discharging end cover main body. The drill bit structure can realize quick powder discharge and quick drilling in a target area in the drilling process under the action of high-pressure gas.
Description
Technical Field
The invention relates to the field of variable-diameter pyramid drilling pressure relief in coal mining or metal mining, in particular to a use method of a forward type full-automatic controllable variable-diameter pressure relief connecting rod drill bit structure.
Background
Compared with shallow mining, deep mining of coal and rock bodies is more complex in stress environment, and the frequency and the strength of rock burst are obviously increased under the action of high stress, strong mining disturbance and complex geological structures. At present, the research on rock burst obtains abundant research results, but the rock burst is still a difficult problem for coal mine science and technology workers due to the 'opacity' of underground rock mass and uncertainty of stress environment where the underground rock mass is located.
Aiming at the problems, a great deal of progress is made by many scholars in the current research of comprehensive control of rock burst, and guarantee is provided for safe mining of coal. The drilling pressure relief technology aims at an effective local active danger relieving measure for preventing and controlling coal mine rock burst, can avoid high stress concentration and improve the medium property of a coal rock mass so as to weaken the capacity of accumulating elastic energy. The drilling pressure relief method in the coal body or rock body is favored by coal mine enterprises due to the advantages of high efficiency, low cost, good pressure relief effect and the like.
However, the existing pressure relief device still has certain defects in field use, which mainly show that the rigidity and the stability of a drill bit in the pressure relief device are not enough; the dust can not be discharged in a dry manner, so that the powder discharging efficiency is not high; the single structural design of drill bit can't satisfy complicated rock mass release needs. Meanwhile, the effective powder discharging space of the original drill bit connected with the advancing type full-automatic controllable reducing pressure relief connecting rod is lower, and effective dry-type powder discharging cannot be realized. Therefore, the research and development of a pressure relief drill bit which can ensure dry powder discharge in a drill hole and can aim at complicated rock mass structure change becomes an urgent problem to be solved at the present stage.
The related research reports in the prior art mainly include:
CN204060516U discloses a dry type internal powder discharge drill bit, which mainly adopts a powder discharge hole on a drill bit body to discharge dry powder, the drill bit body of the device is cylindrical, and the drill bit body is parallel to a rock wall in a rock body, and an effective powder discharge space cannot be formed, so that the powder discharge efficiency of the drill bit is low, and the drill bit cannot be applied to a forward full-automatic controllable reducing pressure relief connecting rod.
CN108979549B discloses a dry-type interior row powder drill bit, mainly adopts spiral cutting sword and through-hole to realize the discharge of dry powder, and this drill bit end can't satisfy the needs to the rock breakage, can cause the massive rock mass to block up the drilling, makes it only be applicable to the drilling in the soft rock mass, and spiral cutting sword intensity is lower simultaneously, causes the drill bit poor stability.
In summary, the test device in the prior art has not realized the problem that the drill bit structure can be changed for complex rock mass, and has not solved the problems of rapid powder discharge and rapid drilling, so related researchers in the field are dedicated to developing a forward type full-automatic controllable reducing pressure relief connecting rod drill bit structure.
Disclosure of Invention
The invention aims to provide a using method of a forward full-automatic controllable reducing pressure relief connecting rod drill bit structure, which can realize quick powder discharge and quick drilling in a target area in the drilling process under the action of high-pressure gas; aiming at different rock mass environments, the self structure is further selectively changed by combining the tensile strength of the coal body or the rock mass, and further the rapid powder discharge and drilling of pressure relief drilling are accelerated.
In order to achieve the purpose, the invention adopts the following technical scheme:
a use method of a forward full-automatic controllable reducing pressure relief connecting rod drill bit structure comprises a crushing exhaust cutting tooth part, a detachable cutting tooth part and a spiral powder discharge end cover part which are sequentially connected from front to back;
the crushing exhaust cutting pick part comprises a crushing exhaust cutting pick body, wherein an axial crushing tooth, a radial cutting pick I and an air guide hole are respectively arranged on the crushing exhaust cutting pick body, the radial cutting pick I is distributed on the periphery of the crushing exhaust cutting pick body in a triangular prism shape, the axial crushing tooth is positioned at the front end of the crushing exhaust cutting pick body, and the air guide hole is positioned at the central position of the crushing exhaust cutting pick body;
the detachable cutting tooth part is formed by sequentially connecting a plurality of groups of detachable cutting tooth monomers, wherein each group of detachable cutting tooth monomers comprises a detachable cutting tooth main body, a radial cutting tooth II is arranged on the detachable cutting tooth main body, the radial cutting tooth II is distributed on the periphery of the detachable cutting tooth main body in a triangular prism shape, and an exhaust hole is formed in the detachable cutting tooth main body;
the spiral powder discharging end cover part comprises a spiral powder discharging end cover main body, a spiral powder discharging groove and an air inlet hole are arranged on the spiral powder discharging end cover main body, the spiral powder discharging groove is formed by spirally arranging steel sheets in an anticlockwise arrangement mode, the air inlet hole is located in the center of the spiral powder discharging end cover main body, and a thread is arranged at the tail end of the spiral powder discharging end cover main body and connected with a pressure relief connecting rod through the thread;
the using method comprises the following steps:
a. determination of number of single elements of detachable cutting tooth
Determining the number of the detachable cutting tooth monomers according to the physical and mechanical properties of the rock mass to be relieved:
when the tensile strength of the rock mass is less than or equal to 3MPa, the detachable cutting tooth part selects 6 detachable cutting tooth monomers;
when the tensile strength of the rock mass is more than 3MPa and less than or equal to 6MPa, 5 detachable cutting tooth units are selected as the detachable cutting tooth parts;
when the tensile strength of the rock mass is more than 6MPa and less than or equal to 9MPa, 4 detachable cutting tooth units are selected as the detachable cutting tooth parts;
when the tensile strength of the rock mass is more than 9MPa and less than or equal to 12MPa, the detachable cutting tooth part selects 3 detachable cutting tooth monomers;
when the tensile strength of the rock mass is more than 12MPa, the detachable cutting tooth part selects 2 detachable cutting tooth monomers;
b. determining a pressure relief target area, selecting a construction site needing local pressure relief treatment according to actual geological conditions of a coal mine, and determining the distance between a pressure relief drill hole and a roadway side or a coal wall to be 0.5-3 times;
c. selecting air pressure, namely determining the pressure of air according to the angle between the drilled hole and the horizontal plane, wherein the air pressure is greater than 0.5MPa when the included angle between the drilled hole and the horizontal plane is theta-90 degrees, and the air pressure is less than or equal to 0.5MPa when the included angle between the drilled hole and the horizontal plane is-90 degrees-theta;
d. in the site construction, a drill bit structure and a pressure relief connecting rod are sequentially connected onto a drilling machine through a drill rod at a construction site for local pressure relief treatment, the drilling machine is started to drill into a target area, and after the target area is reached, the drilling machine is utilized to slowly withdraw related devices.
As a preferred scheme of the invention, the pressure relief connecting rod comprises a pressure relief connecting rod main body, an expanding cutting head, a fixed cutter head, a supporting expanding rod, a sliding connecting wedge, a trigger piston, a spring, a sliding fixing plate and a limiter;
the pressure relief connecting rod main body is integrally cylindrical, two grooves are arranged on the pressure relief connecting rod main body and are respectively used as a connecting wedge track and a fixing plate track, the sliding fixing plate is positioned in the fixing plate track, the sliding connecting wedge is positioned in the connecting wedge track, and the sliding connecting wedge and the connecting wedge can slide relatively in the respective tracks; a water/gas communicating pipe and a piston cavity are arranged in the pressure relief connecting rod main body, the piston cavity is positioned in the center of the pressure relief connecting rod main body, the water/gas communicating pipe is positioned on two sides of the pressure relief connecting rod main body, a plurality of limiting holes are uniformly arranged above the fixing plate rail at intervals, and the connecting wedge rail is communicated with the piston cavity;
a group of the diameter-expanding cutting heads, a group of the supporting diameter-expanding rods and a group of the fixing rods are symmetrically arranged on two sides of the pressure relief connecting rod main body, wherein the front end of each diameter-expanding cutting head is movably connected to the sliding fixing plate, the rear end of each diameter-expanding cutting head is movably connected to the front end of the fixed cutter head on the same side of the sliding fixing plate, and the tail end of the fixed cutter head on the same side of the sliding fixing plate is movably connected to the pressure relief connecting rod main body;
the front end of each supporting diameter expanding rod is movably connected to the fixed cutter head on the same side of the supporting diameter expanding rod, the rear end of each supporting diameter expanding rod is movably connected to the sliding connection wedge, the sliding connection wedge is tightly attached to one side of the trigger piston, the trigger piston is located in the piston cavity and is connected with the spring, and the limiting device is arranged in the limiting hole.
In another preferable scheme of the invention, the detachable cutting tooth single bodies are provided with 3-6 groups, the end part of the detachable cutting tooth main body is provided with a thread, and adjacent detachable cutting tooth single bodies are connected through the thread.
Preferably, the first radial cutting pick and the second radial cutting pick are made of hard alloy, and the steel sheet is also made of hard alloy.
Preferably, the crushing and exhausting tooth intercepting part, the detachable tooth intercepting part and the spiral powder discharging end cover part are sequentially connected together through threads.
Furthermore, the maximum diameter of the crushing exhaust cutting pick body is 90mm, the minimum diameter of the detachable cutting pick body is 100mm, the maximum diameter of the detachable cutting pick body is 150mm, and the maximum outer diameter of the spiral powder discharge groove is 135 mm.
Further, the included angle between the adjacent first radial cutting picks is 120 degrees, and the included angle between the adjacent second radial cutting picks is 120 degrees.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a use method of a forward type full-automatic controllable reducing pressure relief connecting rod drill bit structure, wherein the drill bit structure comprises a crushing exhaust cutting tooth part, a detachable cutting tooth part and a spiral powder discharge end cover part which are sequentially connected from front to back, wherein the crushing exhaust cutting tooth part is arranged at the foremost end of a drill bit main body, the crushing exhaust cutting tooth part comprises a crushing exhaust cutting tooth main body, axial crushing teeth, a radial cutting tooth I and air guide holes are respectively arranged on the crushing exhaust cutting tooth main body, the crushing degree of rocks is high through mutual matching of the axial crushing teeth and the radial cutting tooth I, the radial cutting tooth I in a triangular prism shape is more beneficial to crushing the rocks, and the drilling speed is improved; the detachable cutting tooth part is formed by connecting a plurality of detachable cutting tooth monomers, the specific number of the detachable cutting tooth monomers is determined by the physical and mechanical properties of a coal body or a rock body and mainly depends on the tensile strength of the rock body, each detachable cutting tooth monomer comprises a detachable cutting tooth main body, a radial cutting tooth II is arranged on the detachable cutting tooth main body and is distributed in a triangular prism shape, the periphery of the detachable cutting tooth main body is high in rock breaking degree due to the design and the distribution of the radial cutting tooth II, and the specific number of the detachable cutting tooth monomers can be reasonably selected according to the tensile strength of the rock. And the quick powder discharge can be realized by combining the spiral powder discharge end cover part.
The drill bit structure can realize the powder discharge in the whole drilling process, so that drilling debris can be effectively discharged out of a drill hole, the occurrence of drill hole blockage is prevented, and the construction efficiency is improved.
The drill bit structure has higher rock breaking degree, prevents large rock mass from obstructing the drilling of the drill bit, and improves the drilling speed.
The bit structure of the invention aims at rock masses with different lithology, reasonably selects the number of cutting teeth according to the tensile strength of the rock, quantitatively controls construction parameters and has stronger adaptability to complex geomechanical environments.
The drill bit structure and the advancing full-automatic controllable reducing pressure relief connecting rod can realize perfect butt joint, and assist in completing local pressure relief of a coal body or a rock body.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is an assembly diagram of a drill bit structure and a pressure relief connecting rod of a forward type full-automatic controllable reducing pressure relief connecting rod according to the present invention;
FIG. 2 is a perspective view of the construction of the drill bit of the present invention;
FIG. 3 is a plan view of the construction of the drill bit of the present invention;
FIG. 4 is a plan view of a removable pick unit of the present invention;
FIG. 5 is an assembly view of a plurality of removable pick units of the present invention;
FIG. 6 is a plan view of the spiral dust discharging end cap portion of the present invention;
in the figure:
1-discharging powder and pressure relief drill bit; 2-a pressure relief connecting rod; 11-breaking exhaust gas cutting tooth part; 12-removable cutting tooth part; 13-spiral powder discharging end cover part; 111-axial crushing teeth; 112-radial cutting pick one; 113-gas-guide holes; 121-radial pick II; 122-threads; 123-vent hole; 131-spiral powder discharge groove; 132-connecting threads; 133-air intake.
Detailed Description
The invention provides a use method of a forward full-automatic controllable reducing pressure relief connecting rod drill bit structure, and in order to make the advantages and technical scheme of the invention clearer and clearer, the invention is described in detail with reference to specific embodiments.
As shown in fig. 1, the pressure relief connecting rod 2 which is matched with the advancing type full-automatic controllable reducing pressure relief connecting rod drill bit structure adopts a pressure relief connecting rod with the same structure as that in application No. 2019110514381, and comprises a pressure relief connecting rod main body, an expanding cutting head, a fixed cutter head, a supporting expanding rod, a sliding connecting wedge, a trigger piston, a spring, a sliding fixing plate and a limiter; the pressure relief connecting rod main body is integrally cylindrical, two grooves are arranged on the pressure relief connecting rod main body and respectively used as a connecting wedge track and a fixing plate track, a sliding fixing plate is positioned in the fixing plate track, a sliding connecting wedge is positioned in the connecting wedge track, and the two sliding connecting wedges can slide in the respective tracks relatively; a water/gas communicating pipe and a piston cavity are arranged in the pressure relief connecting rod main body, the piston cavity is positioned in the center of the pressure relief connecting rod main body, the water/gas communicating pipe is positioned on two sides of the pressure relief connecting rod main body, a plurality of limiting holes are uniformly arranged above the fixed plate rail at intervals, and the connecting wedge rail is communicated with the piston cavity;
a group of expanding cutting heads, a group of supporting expanding rods and a group of fixing rods are symmetrically arranged on two sides of the pressure relief connecting rod main body, wherein the front end of each expanding cutting head is movably connected to the sliding fixing plate, the rear end of each expanding cutting head is movably connected to the front end of the fixed cutter head on the same side of the expanding cutting head, and the tail end of the fixed cutter head on the same side of the expanding cutting head is movably connected to the pressure relief connecting rod main body;
the front end of each supporting diameter expanding rod is movably connected to the fixed cutter head on the same side of the supporting diameter expanding rod, the rear end of each supporting diameter expanding rod is movably connected to a sliding connection wedge, the sliding connection wedge is tightly attached to one side of a trigger piston, the trigger piston is located in a piston cavity and is connected with a spring, and a stopper is arranged in a limiting hole.
The main innovation point of the invention lies in improving the pressure relief drill bit 1 for discharging powder, which comprises a breaking exhaust tooth-cutting part 11, a detachable tooth-cutting part 12 and a spiral powder discharge end cover part 13, wherein the breaking exhaust tooth-cutting part 11 is located at the foremost end of the device, the detachable tooth-cutting part 12 is connected to the tail end of the breaking exhaust tooth-cutting part 11 through a thread, for example, an external thread is arranged at the tail end of the breaking exhaust tooth-cutting part, an internal thread is arranged at the end of the detachable tooth-cutting part, and the two are butted and connected with the internal thread through the external thread and the internal thread in a matching way. The screw discharging end cap part 13 is arranged at the tail end of the detachable cutting tooth part 12, and the screw discharging end cap part and the detachable cutting tooth part are also connected together through screw threads.
The crushing exhaust cutting pick part comprises a crushing exhaust cutting pick body which is a hollow cylinder, axial crushing teeth 111, radial cutting teeth 112 and air guide holes 113 are respectively arranged on the crushing exhaust cutting pick body, wherein the number of the radial cutting teeth is three, the radial cutting teeth are uniformly distributed on the periphery of the crushing exhaust cutting pick body, the included angle between every two adjacent radial cutting teeth is preferably 120 degrees, the three radial cutting teeth 112 are distributed on the periphery of the crushing exhaust cutting pick body in a triangular prism shape, the axial crushing teeth 111 are positioned at the front end of the crushing exhaust cutting pick body, the air guide holes 113 are positioned at the central position of the crushing exhaust cutting pick body, the axial crushing cutting teeth 111 are used for crushing rocks in front of a drill bit, the drill bit can conveniently drill on a fixed track, the radial cutting teeth are arranged in the triangular prism shape, compared with the conventional drill bit structure, the hollow distribution characteristics are presented, the device has the advantages that a large amount of movement space is provided for the broken rock mass, and the broken rock mass or rock dust is convenient to discharge;
the air guide hole is used for providing high-pressure air at the front end of the drill bit and extruding the broken rock mass or rock powder in the broken exhaust cutting tooth part 11 and the detachable cutting tooth part 12 to the spiral powder discharge end cover part 13, so that the broken rock mass or rock powder can be conveniently and quickly discharged;
as shown in fig. 4 and 5, the detachable cutting tooth portion is formed by sequentially connecting a plurality of groups of detachable cutting tooth units, the specific number of the detachable cutting tooth units is determined by the physical and mechanical properties of a coal body or a rock body, and mainly depends on the tensile strength of the rock body, for example, 3 to 6 detachable cutting tooth units are preferred, and adjacent detachable cutting tooth units are connected through a thread 122.
Every group can load and unload the pick monomer including loading and unloading the pick main part, loading and unloading the pick main part is a hollow cylinder, be provided with radial pick two 121 on loading and unloading the pick main part, radial pick two 121 is the periphery that the triangular prism form distributes at the loading and unloading pick main part, the effect of radial pick two is with the radial rock of drill bit breakage, the drill bit of being convenient for expands in the country rock and advances, compare with current drill bit, the benefit of the structure of this part design like this is that can guarantee in the drilling dry type arrange the powder fast and can realize the structure changeable of release drill bit to complicated rock mass again: be provided with exhaust hole 123 on can loading and unloading pick body, the effect of exhaust hole 123 is that the radial regional high-pressure gas that provides of drill bit, will break rock mass or rock powder row and extrude spiral row powder end cap portion 13, makes things convenient for broken rock mass or rock powder to discharge fast.
As shown in FIG. 6, the spiral powder discharging end cover part comprises a spiral powder discharging end cover main body, a spiral powder discharging groove 131 and an air inlet 133 are arranged on the spiral powder discharging end cover main body, the spiral powder discharging groove 131 is formed by spirally arranging steel sheets which are arranged anticlockwise, and the spiral powder discharging groove 131 has the advantages that a guide groove is provided for broken rock masses or rock powder, accumulation and blockage along the powder are avoided, and quick powder discharging is realized.
The air inlet hole is positioned in the center of the spiral powder discharging end cover main body, the tail end of the spiral powder discharging end cover main body is provided with a connecting thread 132, and the connecting thread 132 is connected with the pressure relief connecting rod.
Preferably, the maximum diameter of the crushing exhaust cutting pick body is 90mm, the minimum diameter of the detachable cutting pick body is 100mm, the maximum diameter of the detachable cutting pick body is 150mm, and the maximum outer diameter of the spiral powder discharge groove is 135 mm.
According to the invention, the included angle between the adjacent first radial cutting picks is 120 degrees, the included angle between the adjacent second radial cutting picks is 120 degrees, and the width of the second radial cutting pick 121 is 40 mm.
The following describes in detail the method of using a progressive full-automatic controllable reducing pressure-relief connecting rod drill bit structure of the present invention.
The use method of the advancing type full-automatic controllable reducing pressure relief connecting rod drill bit structure specifically comprises the following steps:
a. determination of number of single elements of detachable cutting tooth
Determining the number of the detachable cutting tooth monomers according to the physical and mechanical properties of the rock mass to be relieved:
when the tensile strength of the rock mass is less than or equal to 3MPa, the detachable cutting tooth part selects 6 detachable cutting tooth monomers;
when the tensile strength of the rock mass is more than 3MPa and less than or equal to 6MPa, 5 detachable cutting tooth units are selected as the detachable cutting tooth parts;
when the tensile strength of the rock mass is more than 6MPa and less than or equal to 9MPa, 4 detachable cutting tooth units are selected as the detachable cutting tooth parts;
when the tensile strength of the rock mass is more than 9MPa and less than or equal to 12MPa, the detachable cutting tooth part selects 3 detachable cutting tooth monomers;
when the tensile strength of the rock mass is more than 12MPa, the detachable cutting tooth part selects 2 detachable cutting tooth monomers;
b. determining a pressure relief target area, selecting a construction site needing local pressure relief treatment according to actual geological conditions of a coal mine, and determining the distance between a pressure relief drill hole and a roadway side or a coal wall to be 0.5-3 times;
c. selecting air pressure, namely determining the pressure of air according to the angle between the drilled hole and the horizontal plane, wherein the air pressure is greater than 0.5MPa when the included angle between the drilled hole and the horizontal plane is theta-90 degrees, and the air pressure is less than or equal to 0.5MPa when the included angle between the drilled hole and the horizontal plane is-90 degrees-theta;
d. in the site construction, a powder discharge pressure relief drill bit and a pressure relief connecting rod are sequentially connected onto a drilling machine through a drill rod at a construction site for local pressure relief treatment, the drilling machine is started to drill towards a target area, and after the target area is reached, the drilling machine is utilized to slowly withdraw related devices.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto.
Although terms such as powder discharge pressure relief drill bits, pressure relief tie rods, broken gas discharge tooth segments, removable tooth segments, etc., are used more herein, the possibility of using other terms is not excluded, and these terms are used merely to more conveniently describe and explain the essence of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.
It is further understood that the specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (7)
1. The utility model provides a method for using of full-automatic controllable reducing release connecting rod drill bit structure of marching type which characterized in that: the drill bit structure comprises a crushing exhaust tooth cutting part, a detachable tooth cutting part and a spiral powder discharge end cover part which are sequentially connected from front to back;
the crushing exhaust cutting pick part comprises a crushing exhaust cutting pick body, wherein an axial crushing tooth, a radial cutting pick I and an air guide hole are respectively arranged on the crushing exhaust cutting pick body, the radial cutting pick I is distributed on the periphery of the crushing exhaust cutting pick body in a triangular prism shape, the axial crushing tooth is positioned at the front end of the crushing exhaust cutting pick body, and the air guide hole is positioned at the central position of the crushing exhaust cutting pick body;
the detachable cutting tooth part is formed by sequentially connecting a plurality of groups of detachable cutting tooth monomers, wherein each group of detachable cutting tooth monomers comprises a detachable cutting tooth main body, a radial cutting tooth II is arranged on the detachable cutting tooth main body, the radial cutting tooth II is distributed on the periphery of the detachable cutting tooth main body in a triangular prism shape, and an exhaust hole is formed in the detachable cutting tooth main body;
the spiral powder discharging end cover part comprises a spiral powder discharging end cover main body, a spiral powder discharging groove and an air inlet hole are arranged on the spiral powder discharging end cover main body, the spiral powder discharging groove is formed by spirally arranging steel sheets in an anticlockwise arrangement mode, the air inlet hole is located in the center of the spiral powder discharging end cover main body, and a thread is arranged at the tail end of the spiral powder discharging end cover main body and connected with a pressure relief connecting rod through the thread;
the using method comprises the following steps:
a. determination of number of single elements of detachable cutting tooth
Determining the number of the detachable cutting tooth monomers according to the physical and mechanical properties of the rock mass to be relieved:
when the tensile strength of the rock mass is less than or equal to 3MPa, the detachable cutting tooth part selects 6 detachable cutting tooth monomers;
when the tensile strength of the rock mass is more than 3MPa and less than or equal to 6MPa, 5 detachable cutting tooth units are selected as the detachable cutting tooth parts;
when the tensile strength of the rock mass is more than 6MPa and less than or equal to 9MPa, 4 detachable cutting tooth units are selected as the detachable cutting tooth parts;
when the tensile strength of the rock mass is more than 9MPa and less than or equal to 12MPa, the detachable cutting tooth part selects 3 detachable cutting tooth monomers;
when the tensile strength of the rock mass is more than 12MPa, the detachable cutting tooth part selects 2 detachable cutting tooth monomers;
b. determining a pressure relief target area, selecting a construction site needing local pressure relief treatment according to actual geological conditions of a coal mine, and determining the distance between a pressure relief drill hole and a roadway side or a coal wall to be 0.5-3 times;
c. selecting air pressure, namely determining the pressure of air according to the angle between the drilled hole and the horizontal plane, wherein the air pressure is greater than 0.5MPa when the included angle between the drilled hole and the horizontal plane is theta-90 degrees, and the air pressure is less than or equal to 0.5MPa when the included angle between the drilled hole and the horizontal plane is-90 degrees-theta;
d. in the site construction, a drill bit structure and a pressure relief connecting rod are sequentially connected onto a drilling machine through a drill rod at a construction site for local pressure relief treatment, the drilling machine is started to drill into a target area, and after the target area is reached, the drilling machine is utilized to slowly withdraw related devices.
2. The use method of the advancing type full-automatic controllable reducing pressure relief connecting rod drill bit structure according to claim 1 is characterized in that: the pressure relief connecting rod comprises a pressure relief connecting rod main body, an expanding cutting head, a fixed tool bit, a supporting expanding rod, a sliding connecting wedge, a trigger piston, a spring, a sliding fixing plate and a limiter;
the pressure relief connecting rod main body is integrally cylindrical, two grooves are arranged on the pressure relief connecting rod main body and are respectively used as a connecting wedge track and a fixing plate track, the sliding fixing plate is positioned in the fixing plate track, the sliding connecting wedge is positioned in the connecting wedge track, and the sliding connecting wedge and the connecting wedge can slide relatively in the respective tracks; a water/gas communicating pipe and a piston cavity are arranged in the pressure relief connecting rod main body, the piston cavity is positioned in the center of the pressure relief connecting rod main body, the water/gas communicating pipe is positioned on two sides of the pressure relief connecting rod main body, a plurality of limiting holes are uniformly arranged above the fixing plate rail at intervals, and the connecting wedge rail is communicated with the piston cavity;
a group of the diameter-expanding cutting heads, a group of the supporting diameter-expanding rods and a group of the fixing rods are symmetrically arranged on two sides of the pressure relief connecting rod main body, wherein the front end of each diameter-expanding cutting head is movably connected to the sliding fixing plate, the rear end of each diameter-expanding cutting head is movably connected to the front end of the fixed cutter head on the same side of the sliding fixing plate, and the tail end of the fixed cutter head on the same side of the sliding fixing plate is movably connected to the pressure relief connecting rod main body;
the front end of each supporting diameter expanding rod is movably connected to the fixed cutter head on the same side of the supporting diameter expanding rod, the rear end of each supporting diameter expanding rod is movably connected to the sliding connection wedge, the sliding connection wedge is tightly attached to one side of the trigger piston, the trigger piston is located in the piston cavity and is connected with the spring, and the limiting device is arranged in the limiting hole.
3. The use method of the advancing type full-automatic controllable reducing pressure relief connecting rod drill bit structure according to claim 1 or 2, is characterized in that: the detachable cutting tooth single bodies are provided with 3-6 groups, threads are arranged at the end parts of the detachable cutting tooth main bodies, and adjacent detachable cutting tooth single bodies are connected through the threads.
4. The use method of the advancing type full-automatic controllable reducing pressure relief connecting rod drill bit structure according to claim 3, is characterized in that: the first radial cutting tooth and the second radial cutting tooth are made of hard alloy, and the steel sheet is also made of hard alloy.
5. The use method of the advancing type full-automatic controllable reducing pressure relief connecting rod drill bit structure according to claim 3, is characterized in that: the crushing exhaust tooth cutting part, the detachable tooth cutting part and the spiral powder discharging end cover part are sequentially connected together through threads.
6. The use method of the advancing type full-automatic controllable reducing pressure relief connecting rod drill bit structure according to claim 3, is characterized in that: the maximum diameter of the crushing exhaust cutting pick body is 90mm, the minimum diameter of the detachable cutting pick body is 100mm, the maximum diameter of the detachable cutting pick body is 150mm, and the maximum outer diameter of the spiral powder discharge groove is 135 mm.
7. The use method of the advancing type full-automatic controllable reducing pressure relief connecting rod drill bit structure according to claim 3, is characterized in that: the included angle between the adjacent first radial cutting picks is 120 degrees, and the included angle between the adjacent second radial cutting picks is 120 degrees.
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