CN216477319U - Plug-in type high-low pressure accurate switching slotting device and slotting device - Google Patents
Plug-in type high-low pressure accurate switching slotting device and slotting device Download PDFInfo
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- CN216477319U CN216477319U CN202122426520.7U CN202122426520U CN216477319U CN 216477319 U CN216477319 U CN 216477319U CN 202122426520 U CN202122426520 U CN 202122426520U CN 216477319 U CN216477319 U CN 216477319U
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Abstract
The utility model discloses a plug-in type high-low pressure accurate switching slot cutting device which comprises a slot cutting device body, a positioning sealing valve rod, a compression spring and water jet nozzles, wherein a first sealing section is arranged outside the front end of the slot cutting device body, a second sealing section, a stepped through hole and a round hole are sequentially arranged inside the slot cutting device body from back to front, the compression spring is sleeved outside the positioning sealing valve rod to form a high-low pressure accurate switching valve core, and the slot cutting device body is also provided with a plurality of water jet nozzles. The utility model also provides a slotting device. The plug-in type high-low pressure accurate switching slot cutting device and the slot cutting device can realize that after drilling construction is completed, a drill rod does not need to be withdrawn, the closing and closing of a water flow channel in the plug-in type high-low pressure accurate switching slot cutting device are controlled by adjusting the pressure of high-pressure water, the threshold value of high-low pressure water flow pressure switching can be accurately adjusted according to different coal seam types and drilling water supply pressure, the maintenance is convenient, and the aim of quickly relieving pressure and increasing permeability of the coal seam is fulfilled.
Description
Technical Field
The utility model relates to the technical field of high-pressure water jet cutting devices, in particular to a plug-in high-low pressure accurate switching slotting device and a slotting device.
Background
With the continuous application of new coal mining technologies and equipment, the mining depth continuously deepens to the deep part at a speed of about 10-20 m every year, and the dynamic disaster of the deep coal rock gradually becomes a main problem which restricts the safe and efficient production of coal mines. The coal and rock dynamic disaster treatment of the deep mine needs disaster prevention and control from the angle of standard reaching and effective pressure relief of coal seam gas extraction, and one of effective measures is a hydraulic pressure relief and permeability improvement measure. Under the deep high stress condition, the reaming, pressure relief and permeability increase of medium and hard coal need to greatly improve the pressure of water jet, so that the coal breaking efficiency and the coal breaking depth are improved, and the problem of treatment of coal and rock dynamic disasters of deep mines is solved. The pressure relief and permeability increase measures such as hydraulic reaming, hydraulic slotting, drilling and cutting integration and the like are widely used, and the existing hydraulic slotting and hydraulic reaming device has the following problems: 1. the integrated functions of low-pressure water drilling and high-pressure water cutting without retreating the drill rod are not provided; 2. the water flow path in the slotting device is not tightly sealed after high-low pressure conversion; 3. the threshold value of the high-pressure water flow and low-pressure water flow pressure switching is not adjustable or can not be accurately adjusted; 4. the working pressure is relatively low; 5. the structure is complex, the field repair is difficult, and once a fault occurs, the device can only be directly returned to a factory for maintenance.
Therefore, an improved and optimized coal seam rapid pressure relief and permeability improvement device is needed, which can realize the purposes of accurately adjusting the switching threshold of the high-pressure water flow and the low-pressure water flow, is convenient to maintain, and achieves the rapid pressure relief and permeability improvement of the coal seam.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model aims to provide a plug-in type high-low pressure accurate switching slotting device and a slotting device. The plug-in type high-low pressure accurate switching slot cutting device can accurately adjust a reasonable pressure conversion threshold value during low pressure drilling through positioning the sealing valve rod and replacing the compression spring according to the pressure of working fluid for drilling equipment, and realizes ultrahigh pressure slot cutting during conventional low pressure drilling and drill withdrawal of the drilling equipment by matching with the high-pressure sealing drill rod.
The above object of the present invention is achieved by the following technical solutions: accurate switching slot ware of cartridge formula high-low pressure, including slot ware body, location sealing valve rod, compression spring and water jet nozzle the front end outside of slot ware body is equipped with first sealed section, and inside is equipped with second sealed section, ladder through-hole and round hole from back to front in proper order, the location sealing valve rod is installed in the ladder through-hole, the ladder through-hole includes first hole, second hole and the third hole that sets gradually from the tail end to the front end, and first hole diameter is greater than second hole diameter, and second hole diameter is greater than third hole diameter, the compression spring suit is in the accurate switching case of high-low pressure is constituteed to the location sealing valve rod outside still install a plurality of water jet nozzles on the slot ware body.
Further, first seal section includes first straight shaft guide section, first O type circle, first right angle sliding ring and first interior sealed taper screw thread be equipped with the annular on the first straight shaft guide section, install first O type circle and first right angle sliding ring in the annular the rear end of first straight shaft guide section is equipped with first interior sealed taper screw thread.
Further, the second sealing section comprises a first outer cone sealing conical thread and a first inner cylindrical hole section, and the first outer cone sealing conical thread and the first inner cylindrical hole section are sequentially arranged on the inner circumferential surface of the slotting device body from the tail end to the front end.
Furthermore, the high-low pressure accurate switching valve core and the inner circumferential surface of the slotting machine body can axially move, the positioning sealing valve rod is a step-type valve rod and comprises a first cylindrical section, a second cylindrical section, a reducing section and a third cylindrical section which are coaxially arranged from the tail end to the front end in sequence, a plurality of circular water through holes are inwards formed along the outer peripheral surface of the first cylindrical section, the peripheral surface of the first cylindrical section is matched with the inner peripheral surface of the first hole of the stepped through hole to form end surface sealing, a clearance seal is formed between the outer peripheral surface of the second cylindrical section and the inner peripheral surface of the third hole of the stepped through hole, the compression spring is sleeved on the periphery of the second cylindrical section, the front end of the compression spring is propped against a step surface formed by the second hole and the third hole of the step through hole, the rear end of the compression spring is propped against the front end surface of the second cylindrical section, the threshold value of the water flow passage of the closed plug-in type high-low pressure precise switching slotting machine is adjusted by replacing the compression springs with different heights and spring stiffness.
Further, the maximum outer diameter D1 of the first cylindrical section of the positioning sealing valve rod is slightly smaller than the inner diameter D2 of the first hole of the stepped through hole to form an annular water passing space, the solid part diameter D3 of the first cylindrical section of the positioning sealing valve rod is larger than the second hole inner diameter D4 of the stepped through hole, the outer diameter D5 of the second cylindrical section is slightly larger than the third hole inner diameter D6 of the stepped through hole, and the outer diameter D7 of the third cylindrical section is smaller than the third hole inner diameter D6.
The utility model also provides a slotting device which comprises a drill bit, a plug-in type high-low pressure accurate switching slotting device, an ultrahigh pressure sealing drill rod, an ultrahigh pressure rotating water tail, a plurality of ultrahigh pressure hoses, a pressure relief regulating valve and an ultrahigh pressure hydraulic power pump station, wherein the drill bit, the plug-in type high-low pressure accurate switching slotting device, the ultrahigh pressure sealing drill rod, the ultrahigh pressure rotating water tail, the plurality of ultrahigh pressure hoses, the pressure relief regulating valve and the ultrahigh pressure hydraulic power pump station are sequentially connected from front to back.
The utility model provides another slotting device which comprises a drill bit, a second plug-in type high-low pressure accurate switching slotting device, a first plug-in type high-low pressure accurate switching slotting device, an ultrahigh pressure sealing drill rod, an ultrahigh pressure rotating water tail, a plurality of ultrahigh pressure hoses, a pressure relief regulating valve and an ultrahigh pressure hydraulic pump station, wherein the drill bit is sequentially connected from front to back; a drilling machine is arranged below the ultrahigh pressure sealing drill rod and is driven by a slewing gear on the drilling machine to rotate and feed, and a pressure relief regulating valve is arranged among the ultrahigh pressure hoses; the ultrahigh pressure hose passes through the rotatory water tail of superhigh pressure and is connected the sealed drilling rod afterbody of superhigh pressure, superhigh pressure water power pump station supplies water to the accurate slotting device that switches of the high low pressure of second cartridge formula, the accurate slotting device that switches of the high low pressure of first cartridge formula and drill bit through superhigh pressure hose and the sealed drilling rod of superhigh pressure, and the release governing valve is used for adjusting line pressure, and then controls the accurate slotting device that switches of the high low pressure of first cartridge formula and the accurate sealing and opening that switch the water circulation way in the slotting device of the high low pressure of second cartridge formula.
Compared with the prior art, the utility model has the beneficial effects that: the plug-in type high-low pressure accurate switching slotting device has the characteristics of simple structure, easiness in processing, difficulty in failure, simplicity and convenience in maintenance and the like. The detachable parts only comprise a positioning sealing valve rod and a compression spring, and the compression spring with corresponding parameters (pressure and height and spring stiffness) can be replaced according to different closed water flow passage thresholds designed as required to realize accurate adjustment of the water flow passage threshold, so that the number of accessories of the slotting machine is reduced, the processing difficulty is reduced, and the cost is saved. The tail part of the plug-in type high-low pressure accurate switching slotting device is connected with an ultrahigh pressure sealing drill rod, the ultrahigh pressure sealing drill rod, a drill bit, a rotary joint, a high-pressure hose, a pressure relief regulating valve, an ultrahigh pressure hydraulic power pump station and the like are combined to form an ultrahigh pressure accurate switching slotting device, a positioning sealing valve rod is displaced under the action of working liquid conveyed by the ultrahigh pressure sealing drill rod, the outer peripheral surface of a first cylindrical section of the positioning sealing valve rod is matched with the inner peripheral surface of a first hole of a stepped through hole to form end surface sealing, the outer peripheral surface of a second cylindrical section is matched with the inner peripheral surface of a third hole of the stepped through hole to form gap sealing, double sealing formed by the end surface sealing and the gap sealing can completely close a high-pressure water channel, the water pressure in a pipeline is sharply increased and is ejected by a water jet nozzle to form ultrahigh-pressure jet flow to flush coal, the ultrahigh-pressure slotting function when drilling equipment is used for conventional low-pressure drilling and rock mass drilling is realized, and the ultrahigh-pressure slotting function is suitable for different working conditions of low-pressure drilling, the series connection structure of the two plug-in type high-low pressure accurate switching slot devices realizes the functions of high-pressure slot and ultrahigh-pressure slot when the drilling equipment is used for drilling in the conventional low pressure mode and removing the drill mode, reduces the hydraulic loss caused by poor internal sealing of the existing device, and improves the working efficiency of the complete equipment.
Drawings
The utility model is further described with reference to the following figures and detailed description.
FIG. 1 is a schematic structural diagram of a cartridge type high-low pressure precise switching slotting machine;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic structural diagram of an ultrahigh pressure sealing drill rod;
FIG. 4 is a schematic view of a matching structure of an ultrahigh pressure sealing drill rod and a plug-in type high-low pressure precise switching slotting device;
FIG. 5 is a schematic structural view of a slitting device according to a third embodiment;
FIG. 6 is a schematic structural view of a slitting device according to a fourth embodiment;
in the figure:
1. a drill bit;
2. the plug-in type high-low pressure accurate switching slotting device; 2-1, accurately switching a slotting device between a first plug-in type high-low pressure; 2-2, accurately switching the slotting device between high and low voltages by a second plug-in mounting type; 21. a slotting machine body; 211. a first seal section; 2111. a first straight shaft guide section; 2112. a first O-ring; 2113. a first right angle slip ring; 2114. a first internally tapered sealing cone thread; 212. a second seal section; 2121. a first outer cone sealing cone thread; 2122. a first inner cylindrical bore section; 213. a stepped through hole; 2131. a first hole; 2132. a second hole; 2133. a third aperture; 22. a compression spring; 23. positioning a sealing valve rod; 231. a first cylindrical section; 2311. a circular water through hole; 232. a second cylindrical section; 233. a diameter-changing section; 234. a third cylindrical section; 24. an annular water passage space; 25. a water jet nozzle;
3. sealing the drill rod at ultrahigh pressure; 31. a drill rod body; 311. a first axial seal structure; 3111. a second straight-axis guide section; 3112. a second O-ring; 3113. a second right angle slip ring; 3114. a second internally tapered sealing cone thread; 312. a second axial seal structure; 3121. a second outer cone sealing cone thread; 3122. a second inner cylindrical bore section; 313. a spiral groove;
4. a drilling machine; 5. rotating the water tail at ultrahigh pressure; 6. an ultra-high pressure hose; 7. a pressure relief regulating valve; 8. an ultrahigh-pressure hydraulic pump station.
Detailed Description
Example one
The details and embodiments of the present invention are further described with reference to the accompanying drawings and the following embodiments.
Referring to fig. 1-2, the plug-in type high-low pressure precise switching slot cutting device 2 comprises a slot cutting device body 21, a positioning sealing valve rod 23, a compression spring 22 and water jet nozzles 25, wherein a first sealing section 211 is arranged outside the front end of the slot cutting device body 21, a second sealing section 212, a stepped through hole 213 and a round hole 214 are sequentially arranged inside the slot cutting device body from back to front, the positioning sealing valve rod 23 is installed in the stepped through hole 213, the stepped through hole 213 comprises a first hole 2131, a second hole 2132 and a third hole 2133 which are sequentially arranged from the tail end to the front end, the diameter of the first hole 2131 is larger than that of the second hole 2132, the diameter of the second hole 2132 is larger than that of the third hole 2133, the compression spring 22 is sleeved outside the positioning sealing valve rod 23 to form a high-low pressure precise switching valve core, and the water jet nozzles 25 are further installed on the slot cutting device body 21.
The second sealing section 212 includes a first external cone sealing conical thread 2121 and a first internal cylindrical hole section 2122, and the first external cone sealing conical thread 2121 and the first internal cylindrical hole section 2122 are sequentially disposed on the inner circumferential surface of the slotting cutter body 21 from the tail end to the front end.
The number of the water jet nozzles 25 is 2-3, and the water jet nozzles are axially symmetrically or axially staggered and symmetrically arranged on the slotting machine body 21 and are positioned between the first inner cylindrical hole section 2122 and the first hole 2131.
The high-low pressure accurate switching valve core and the inner circumferential surface of the slotting device body 21 can axially move, the positioning sealing valve rod 23 is a stepped valve rod and comprises a first cylindrical section 231, a second cylindrical section 232, a reducing section 233 and a third cylindrical section 234 which are coaxially arranged from the tail end to the front end in sequence, a plurality of circular water through holes 2311 which are axially arranged are arranged inwards along the outer circumferential surface of the first cylindrical section 231, the circular water through holes 2311 are arranged for water through, the outer circumferential surface of the first cylindrical section 231 is matched with the inner circumferential surface of a first hole 2131 of a stepped through hole 213 to form end surface sealing, the outer circumferential surface of the second cylindrical section 232 and the inner circumferential surface of a third hole 2133 of the stepped through hole 213 form clearance sealing, the compression spring 22 is sleeved on the outer circumference of the second cylindrical section 232, the front end is abutted against the stepped surface formed by the second hole 2132 and the third hole 2133 of the stepped through hole 213, and the rear end is abutted against the front end surface of the second cylindrical section 232, the pressure conversion threshold value of the water flow passage of the closed plug-in type high-low pressure precise switching slotting machine is adjusted by the compression spring 22 with different pressure and height and spring stiffness.
The maximum outer diameter D1 of the first cylindrical section 231 of the positioning sealing valve rod 23 is slightly smaller than the inner diameter D2 of the first hole 2131 of the stepped through hole 213, forming an annular water passing space 24.
The diameter D3 of the solid portion of the first cylindrical section 231 of the positioning sealing valve rod 23 is larger than the inner diameter D4 of the second hole 2132 of the stepped through hole 213, and the outer diameter D5 of the second cylindrical section 232 is slightly larger than the inner diameter D6 of the third hole 2133 of the stepped through hole 213; the third cylindrical section 234 outer diameter D7 is less than the third hole 2133 inner diameter D6.
The working principle of the first embodiment is as follows: and determining a reasonable pressure conversion threshold value of the plug-in type high-low pressure accurate switching slotting device 2 according to the pressure of working fluid supplied to the drilling equipment, and adjusting the threshold value of a water flow passage of the closed plug-in type high-low pressure accurate switching slotting device 2 by replacing compression springs 22 with different pressures, heights and spring stiffness. When the pressure of working fluid (all working fluid in the embodiment of the utility model) supplied to the drilling equipment is less than a threshold value, the working fluid cannot enable the positioning sealing valve rod 23 to move forwards, the outer peripheral surface of the first cylindrical section of the positioning sealing valve rod 23 and the inner peripheral surface of the first hole 2131 of the stepped through hole 213 cannot form end face sealing, the outer peripheral surface of the second cylindrical section 232 and the inner peripheral surface of the third hole 2133 of the stepped through hole 213 cannot form clearance sealing, the water flow passage in the plug-in type high-low pressure precise switching slot cutter 2 is opened, and low-pressure drilling is realized; when the pressure of the working fluid supplied to the drilling equipment is greater than a threshold value, the positioning sealing valve rod 23 in the plug-in type high-low pressure precise switching slotting device 2 is displaced under the action of the working fluid conveyed by the ultrahigh pressure sealing drill rod, the outer peripheral surface of the first cylindrical section 231 of the positioning sealing valve rod 23 is matched with the inner peripheral surface of the first hole 2131 of the stepped through hole 213 to form end surface sealing, the outer peripheral surface of the second cylindrical section 232 is matched with the inner peripheral surface of the third hole 2133 of the stepped through hole 213 to form gap sealing, double sealing formed by the end surface sealing and the gap sealing is adopted to effectively close a high-pressure water channel, the water pressure in the pipeline is sharply increased, and the ultrahigh pressure water jet flows to flush and cut coal and rock masses through the water jet nozzle 25, so that ultrahigh pressure slotting is realized.
Example two
Referring to fig. 5, the utility model also provides a slotting device, which comprises a drill bit 1, a plug-in type high-low pressure accurate switching slotting device 2, a first plug-in type high-low pressure accurate switching slotting device 2-1, an ultrahigh pressure sealing drill rod 3, an ultrahigh pressure rotating water tail 5, a plurality of ultrahigh pressure hoses 6 and an ultrahigh pressure hydraulic pump station 8 which are sequentially connected from front to back, wherein a drilling machine 4 is arranged below the ultrahigh pressure sealing drill rod 3 and is driven by a revolving device on the drilling machine 4 to feed in a rotating manner, a pressure relief regulating valve 7 is arranged among the ultrahigh pressure hoses 6, the ultrahigh pressure hydraulic pump station 8 supplies water to the plug-in type high-low pressure accurate switching slotting device 2 and the drill bit 1 through the ultrahigh pressure hoses 6 and the ultrahigh pressure sealing drill rod 3, the pressure relief regulating valve 7 is used for regulating the pressure of a pipeline working fluid so as to control the closing and opening of a water flow passage in the plug-in high-low pressure accurate switching slotting device, thereby realizing the low-pressure drilling and the ultrahigh-pressure slotting of the slotting device.
Referring to fig. 3, the ultrahigh pressure sealing drill rod 3 includes a drill rod body 31, a first axial sealing structure 311 is disposed on an outer circumferential surface of a front end of the drill rod body 31, a second axial sealing structure 312 is disposed on an inner circumferential surface of a tail end of the drill rod body 31, the first axial sealing structure 311 includes a second straight shaft guide section 3111, a second inner cone sealing cone thread 3114, a second O-ring 3112 and a second right angle slip ring 3113, a ring groove is disposed on the second straight shaft guide section 3111, the second O-ring 3112 and the second right angle slip ring 3113 are mounted in the ring groove, and the second inner cone sealing cone thread 3114 is disposed at a rear end of the second straight shaft guide section 3111; the second axial sealing structure 312 comprises a second outer cone sealing conical thread 3121 and a second inner cylindrical hole section 3122 which are sequentially arranged from back to front; the second straight shaft guide section 3111 and the second inner cylindrical bore section 3122 are concentric, and the inner diameter of the second inner cylindrical bore section 3122 is greater than the outer diameter of the second straight shaft guide section 3111;
be equipped with spiral groove 313 on the periphery wall of drilling rod body 31, be favorable to carrying out the discharge coal petrography piece when the water conservancy measure, reduce drilling rod weight simultaneously, reduce intensity of labour.
The second O-ring 3112 and the second right-angle slip ring 3113 are mounted in sequence in the water pressure direction.
The second straight shaft guide section 3111 and the first inner cylindrical hole section 2122 of the cartridge type high-low pressure accurate switching slotting device 2 are concentric, the inner diameter of the first inner cylindrical hole section 2122 is larger than the outer diameter of the second straight shaft guide section 3111, and the inner diameter of the first inner cylindrical hole section 2122 is larger than the outer diameter of the second straight shaft guide section 3111 by 0.5 mm.
Referring to fig. 4, when the ultrahigh-pressure sealed drill rod 3 and the plug-in type high-low pressure precise switching slot cutter 2 are installed, the second straight-shaft guide section 3111 and the second internal tapered sealing cone thread 3114 are axially inserted into the first internal cylindrical hole section 2122 and the first external tapered sealing cone thread 2121, and the second internal tapered sealing cone thread 3114 at the front end of the ultrahigh-pressure sealed drill rod 3 and the first external tapered sealing cone thread 2121 at the tail end of the plug-in type high-low pressure precise switching slot cutter 2 form thread sealing; the front end of the second straight shaft guide section 3111 is provided with a chamfer, so that the ultrahigh pressure sealing drill rod 3 can be conveniently installed, the second O-shaped ring 3112 and the second right-angle slip ring 3113 are sequentially installed in the ring groove to form combined sealing, the bearing capacity is high, and the second inner cone sealing taper thread 3114 of the ultrahigh pressure sealing drill rod 3 and the first outer cone sealing taper thread 2121 of the cartridge type high-low pressure accurate switching slot cutting device 2 form taper thread sealing.
When a plurality of ultrahigh pressure sealing drill rods 3 are sequentially connected end to end, the first axial sealing structure 311 and the second axial sealing structure 312 of two adjacent ultrahigh pressure sealing drill rods 3 are matched, and the second O-shaped ring 3112 and the second right-angle slip ring 3113 are sequentially arranged in the ring grooves to form combined sealing; the second straight shaft guide section 3111 and the second inner cylindrical hole section 3122 cooperate to form a gap seal, reducing leakage and pressure transmission of high pressure water to the combined seal; the second internal tapered sealing cone threads 3114 and the second external tapered sealing cone threads 3121 cooperate to form a tapered thread seal.
When the rotatory water tail 5 of superhigh pressure is connected with the second axial seal structure 312 of the sealed drilling rod 3 tail end of superhigh pressure, also adopt with the sealed drilling rod 3 of superhigh pressure and the same seal structure of the accurate switching slotting device 2 installation of cartridge formula high-low pressure, the front end of the rotatory water tail of superhigh pressure also sets up straight axle guide section and the sealed awl screw thread of interior awl, no longer gives details concrete connection structure.
EXAMPLE III
Referring to fig. 5, a method for using the slotting device is implemented by using the slotting device described in the second embodiment, and includes the following specific steps:
101, installing an ultrahigh-pressure sealed drill rod 3 on a drilling machine 4 and rotationally feeding the ultrahigh-pressure sealed drill rod by driving a rotating device on the drilling machine 4, wherein a plug-in high-low pressure accurate switching slotting device 2 is installed at the front end of the ultrahigh-pressure sealed drill rod 3; the front end of the plug-in type high-low pressure accurate switching slotting device 2 is provided with a drill bit 1; the ultrahigh pressure hose 6 is connected behind the ultrahigh pressure sealing drill rod 3 through the ultrahigh pressure rotating water tail 5; the pressure relief regulating valve 7 is arranged among the plurality of ultrahigh pressure hoses 6, and the ultrahigh pressure hydraulic power pump station 8 supplies water into the ultrahigh pressure sealing drill rod 3 and the plug-in high-low pressure accurate switching slotting device 2 and the drill bit 1 through the ultrahigh pressure hoses 6 and the ultrahigh pressure rotating water tail 5;
102, designing a reasonable pressure conversion threshold value of the plug-in type high-low pressure accurate switching slotting device 2 according to the pressure of working fluid supplied to drilling equipment, and adjusting the pressure conversion threshold value P1 of a water flow passage of the closed plug-in type high-low pressure accurate switching slotting device 2 by replacing a deformation compression spring 22 so as to change the maximum pressure allowed to pass through a water outlet of a drill bit 1;
103, adjusting the pressure of the water conveyed by the ultrahigh pressure hose 6 through the pressure relief adjusting valve 7, so as to control the closing or opening of a water flow passage in the plug-in high-low pressure accurate switching slotting device 2, thereby realizing the low-pressure drilling or ultrahigh pressure slotting of the slotting device.
And 104, after the ultrahigh-pressure hydraulic slotting operation is completed in the whole drilling hole or area, the plug-in type high-low pressure accurate switching slotting device can be detached, cleaned and maintained.
The step 103 is specifically:
the pressure of water conveyed by the ultrahigh pressure hose 6 is adjusted by the pressure relief adjusting valve 7, when the pressure P between the pressure relief adjusting valve 7 and the ultrahigh pressure rotary water tail 5 is smaller than P1, the positioning sealing valve rod 23 cannot be moved forward by working liquid, the outer peripheral surface of the first cylindrical section 231 of the positioning sealing valve rod 23 and the inner peripheral surface of the first hole 2131 of the stepped through hole 213 cannot form end face sealing, the outer peripheral surface of the second cylindrical section 232 and the inner peripheral surface of the third hole 2133 of the stepped through hole 213 cannot form clearance sealing, the water flow passage in the plug-in type high-low pressure precise switching slot cutter 2 is opened, and low pressure drilling is realized; when the pressure P between the pressure relief regulating valve 6 and the ultrahigh-pressure rotating water tail 5 is greater than P1, the positioning sealing valve rod 23 in the plug-in type high-low pressure precise switching slot cutting device 2 displaces under the action of working liquid conveyed by the ultrahigh-pressure sealing drill rod 3, the outer peripheral surface of the first cylindrical section 231 of the positioning sealing valve rod 23 is matched with the inner peripheral surface of the first hole 2131 of the stepped through hole 213 to form end surface sealing, the outer peripheral surface of the second cylindrical section 232 is matched with the inner peripheral surface of the third hole 2133 of the stepped through hole 213 to form gap sealing, double sealing formed by the end surface sealing and the gap sealing effectively closes a high-pressure water channel, and the water pressure in the pipeline sharply rises and is jetted out through the water jet nozzle 25 to form ultrahigh-pressure water jet to cut coal and realize ultrahigh-pressure slot cutting of rock mass.
The ultrahigh pressure slotting mode of the step 103 is a forward slotting mode and a backward slotting mode; the specific operation steps are that in the process of forward slotting or backward slotting, the drilling machine 4 executes the step 103 of ultrahigh pressure slotting for 2 times at two ends of the stroke of a single ultrahigh pressure sealing drill rod 3, then the step 103 is repeated after more than 2 ultrahigh pressure sealing drill rods 3 are increased or reduced until the whole drilling hole finishes ultrahigh pressure hydraulic slotting operation.
Example four
The plug-in type high-low voltage accurate switching slotting device 2 can also be applied in a slotting device in series, and the slotting device has the following specific structure:
referring to fig. 6, the slotting device comprises a drill bit 1, a second plug-in type high-low pressure accurate switching slotting device 2-2, a first plug-in type high-low pressure accurate switching slotting device 2-1, an ultrahigh pressure sealing drill rod 3, an ultrahigh pressure rotating water tail 5, a plurality of ultrahigh pressure hoses 6, a pressure relief regulating valve 7 and an ultrahigh pressure hydraulic pump station 8, wherein the drill bit 1, the second plug-in type high-low pressure accurate switching slotting device 2-2 and the first plug-in type high-low pressure accurate switching slotting device are sequentially connected from front to back in sequence, and the structure of the second plug-in type high-low pressure accurate switching slotting device is the same as that of the plug-in type high-low pressure accurate switching slotting device 2 of the first embodiment; a drilling machine 4 is arranged below the ultrahigh pressure sealing drill rod 3 and is driven by a slewing gear on the drilling machine 4 to rotate and feed, and a pressure relief regulating valve 7 is arranged among the ultrahigh pressure hoses; the ultrahigh pressure hose 6 is connected to 3 afterbody of superhigh pressure sealed drilling rod through the rotatory water tail 5 of superhigh pressure, superhigh pressure water power pump station 8 supplies water to the accurate switching slot ware 2-2 of second cartridge formula high-low pressure, the accurate switching slot ware 2-1 of first cartridge formula high-low pressure and drill bit 1 through superhigh pressure hose 6 and the sealed drilling rod 3 of superhigh pressure, release governing valve 7 is used for adjusting line pressure, and then controls the accurate sealing and the opening of the water circulation route in the accurate switching slot ware 2-1 of first cartridge formula high-low pressure and the accurate switching slot ware 2-2 of second cartridge formula high-low pressure to realize the low pressure of slot device and creep into and hierarchical high-pressure slot.
The slotting device of the fourth embodiment is applied to ultrahigh-pressure hydraulic slotting, the depth of a slot is more than 1000mm, the distance is more than 5m, certain blank space can exist in the space of 5m when gas flows, the distance between the slots can be increased to 6-8 m by serially connecting the plug-in type high-low pressure precise switching slotting devices 2, high-pressure slotting is carried out at the middle position, and finally the deep-shallow-deep slot is formed, so that the operation range can be increased under the condition of not increasing the construction procedure, and the operation effect is improved.
Referring to fig. 6, the method for using the slotting device of the fourth embodiment includes the following specific steps:
step 201, installing the ultrahigh-pressure sealing drill rod 3 on a drilling machine 4 and rotationally feeding the ultrahigh-pressure sealing drill rod by driving a slewing device on the drilling machine, wherein a second plug-in type high-low pressure accurate switching slot cutter 2-2 and a first plug-in type high-low pressure accurate switching slot cutter 2-1 are installed at the front end of the ultrahigh-pressure sealing drill rod 3 in series; a drill bit 1 is arranged at the front end of the first plug-in type high-low pressure accurate switching slotting device 2-1; the ultrahigh pressure hose 6 is connected behind the ultrahigh pressure sealing drill rod 3 through the ultrahigh pressure rotating water tail 5; the pressure relief regulating valve 7 is arranged among the ultrahigh pressure hoses 6, and the ultrahigh pressure hydraulic power pump station 8 supplies water to the ultrahigh pressure sealing drill rod 3, the second plug-in type high-low pressure accurate switching slotting device 2-2, the first plug-in type high-low pressure accurate switching slotting device 2-1 and the drill bit 1 through the ultrahigh pressure hoses 6 and the ultrahigh pressure rotating water tail 5;
202, determining a reasonable pressure conversion threshold P2 of the first plug-in type high-low pressure accurate switching slot device 2-1 according to the pressure of working fluid supplied to drilling equipment, determining a pressure conversion threshold P3 of the second plug-in type high-low pressure accurate switching slot device 2-2 according to design, and enabling P3 to be larger than P2; (the elasticity (the combined pressure height and the spring stiffness) of the compression spring 22 of the second plug-in type high-low pressure accurate switching slotting device 2-2 is larger than the elasticity (the combined pressure height and the spring stiffness) of the compression spring 22 of the first plug-in type high-low pressure accurate switching slotting device 2-1)
And 203, adjusting the pressure of water conveyed by the ultrahigh pressure hose 6 through the pressure relief regulating valve 7, so as to control the closing or opening of water flow passages in the first plug-in type high-low pressure accurate switching slot cutting device 2-1 and the second plug-in type high-low pressure accurate switching slot cutting device 2-2, and further realize low-pressure drilling, high-pressure slot cutting or ultrahigh pressure slot cutting of the slot cutting device.
And 204, after the ultrahigh-pressure hydraulic slotting operation is finished in the whole drilling or operating area, the plug-in type high-low pressure accurate switching slotting device can be detached, cleaned and maintained.
The step 203 specifically includes:
the pressure P of water conveyed by the ultrahigh-pressure hose 6 is adjusted through the pressure relief adjusting valve 7, when the pressure P between the pressure relief adjusting valve 6 and the ultrahigh-pressure rotating water tail 5 is less than P2, the working liquid cannot enable the second plug-in type high-low pressure accurate switching slot cutter 2-2 and the positioning sealing valve rod 23 of the first plug-in type high-low pressure accurate switching slot cutter 2-1 to move forwards, the outer peripheral surface of the first cylindrical section of the positioning sealing valve rod 23 and the inner peripheral surface of the first hole 2131 of the stepped through hole 213 cannot form end surface sealing, and the outer peripheral surface of the second cylindrical section 232 and the inner peripheral surface of the third hole 2133 of the stepped through hole 213 cannot form clearance sealing, so that low-pressure normal drilling is realized; when the output pressure P of the ultrahigh-pressure hydraulic pump station 8 is between P2 and P3, the high-pressure water channel of the second plug-in high-low pressure accurate switching slot device 2-2 is opened, the high-pressure water channel of the first plug-in high-low pressure accurate switching slot device 2-1 is closed, and the water pressure in the pipeline is rapidly increased and is ejected through the water jet nozzles 25 of the first plug-in high-low pressure accurate switching slot device 2-1 and the second plug-in high-low pressure accurate switching slot device 2-2 to form high-pressure water jet to impact the coal rock mass; when the output pressure P of the ultrahigh-pressure hydraulic power pump station 8 is more than P3, the high-pressure water channels of the first plug-in high-low pressure accurate switching slot cutting device 2-1 and the second plug-in high-low pressure accurate switching slot cutting device 2-2 are effectively closed, and the water pressure in the pipeline is sharply increased and is ejected through the water jet nozzle 25 of the second plug-in high-low pressure accurate switching slot cutting device 2-2 to form ultrahigh-pressure water jet flow for cutting the coal rock mass.
The ultrahigh pressure slotting mode of the step 203 is a forward slotting mode and a backward slotting mode; the specific operation steps are that the step 203 of ultrahigh pressure slotting is executed for 2 times at two ends of the stroke of a single ultrahigh pressure sealing drill rod 3 in the process of advancing type slotting or retreating type slotting, then the step 203 is repeated after more than 2 ultrahigh pressure sealing drill rods 3 are added or reduced until the whole drilling hole finishes the ultrahigh pressure hydraulic slotting operation.
In example three and example five:
when a plurality of ultrahigh pressure hoses 6 are connected, ultrahigh pressure pulse-resistant hose joints are adopted for connection among the ultrahigh pressure hoses 6.
The ultrahigh-pressure rotating water tail 5 is fully sealed by hard alloy, and the flow coefficient is larger than 3.0.
The ultrahigh-pressure hydraulic pump station 8 is a horizontal five-plunger reciprocating pump with rated pressure of more than 100MPa and rated flow of more than 6m3/h。
The drilling machine 4 is a crawler-type automatic drilling machine, the ultrahigh-pressure hydraulic power pump station 8 is a crawler-type, and both the drilling machine 4 and the ultrahigh-pressure hydraulic power pump station 8 can be remotely operated.
The plug-in type high-low pressure accurate switching slot cutting device and the slot cutting device can realize that after drilling construction is finished, a drill rod does not need to be withdrawn, the closing and closing of the water flow channel in the plug-in type high-low pressure accurate switching slot cutting device are controlled by adjusting the pressure of high-pressure water, the threshold value of high-low pressure water flow pressure switching can be accurately adjusted according to different coal seam types and drilling water supply pressure, the maintenance is convenient, and the aims of quickly releasing pressure and increasing permeability of the coal seam are fulfilled.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (6)
1. Accurate switching slot ware of cartridge formula high-low pressure, its characterized in that, including slot ware body, location sealing valve rod, compression spring and water jet nozzle the front end outside of slot ware body is equipped with first sealed section, and inside is equipped with second sealed section, ladder through-hole and round hole from back to front in proper order, location sealing valve rod is installed in the ladder through-hole, the ladder through-hole includes first hole, second hole and the third hole that sets gradually from the tail end to the front end, and first hole diameter is greater than second hole diameter, and second hole diameter is greater than third hole diameter, the compression spring suit is in the accurate switching case of high-low pressure is constituteed to location sealing valve rod outside still install a plurality of water jet nozzles on the slot ware body.
2. The cartridge type high-low pressure precise switching slotting device according to claim 1, wherein the first sealing section comprises a first straight shaft guiding section, a first O-ring, a first straight angle sliding ring and a first inner cone sealing taper thread, an annular groove is formed on the first straight shaft guiding section, the first O-ring and the first straight angle sliding ring are installed in the annular groove, and the first inner cone sealing taper thread is arranged at the rear end of the first straight shaft guiding section.
3. The cartridge type high-low pressure accurate switching slot machine according to claim 1, wherein the second sealing section comprises a first outer conical sealing conical thread and a first inner cylindrical hole section, and the first outer conical sealing conical thread and the first inner cylindrical hole section are sequentially arranged on the inner circumferential surface of the slot machine body from the tail end to the front end.
4. The cartridge type high-low pressure accurate switching slotting device according to claim 1, wherein the high-low pressure accurate switching valve core and the inner peripheral surface of the slotting device body are axially movable, the positioning sealing valve rod is a stepped valve rod and comprises a first cylindrical section, a second cylindrical section, a diameter-changing section and a third cylindrical section which are coaxially arranged from the tail end to the front end in sequence, a plurality of circular water through holes are formed in the outer peripheral surface of the first cylindrical section in the axial direction, the outer peripheral surface of the first cylindrical section is matched with the inner peripheral surface of the first hole of the stepped through hole to form end surface sealing, the outer peripheral surface of the second cylindrical section is in clearance sealing with the inner peripheral surface of the third hole of the stepped through hole, the compression spring is sleeved on the outer periphery of the second cylindrical section, the front end is abutted against the stepped surface formed by the second hole and the third hole of the stepped through hole, and the rear end is abutted against the front end surface of the second cylindrical section, the threshold value of the water flow passage of the closed plug-in type high-low pressure precise switching slotting machine is adjusted by replacing the compression springs with different heights and spring stiffness.
5. The slotting device is characterized by comprising a drill bit and the following claims 1-4, wherein the drill bit is sequentially connected from front to back, and the inserted high-low pressure accurate switching slotting device, the ultrahigh pressure sealing drill rod, the ultrahigh pressure rotating water tail, the multiple ultrahigh pressure hoses, the pressure relief regulating valve and the ultrahigh pressure hydraulic pump station are arranged in sequence.
6. The slotting device is characterized by comprising a drill bit, a second plug-in type high-low pressure accurate switching slotting device, a first plug-in type high-low pressure accurate switching slotting device, an ultrahigh pressure sealing drill rod, an ultrahigh pressure rotating water tail, a plurality of ultrahigh pressure hoses, a pressure relief regulating valve and an ultrahigh pressure hydraulic pump station, wherein the drill bit, the structure of the second plug-in type high-low pressure accurate switching slotting device and the plug-in type high-low pressure accurate switching slotting device of any one of claims 1 to 4 are sequentially connected from front to back; a drilling machine is arranged below the ultrahigh pressure sealing drill rod and is driven by a slewing gear on the drilling machine to rotate and feed, and a pressure relief regulating valve is arranged among the ultrahigh pressure hoses; the ultrahigh pressure hose passes through the rotatory water tail of superhigh pressure and is connected the sealed drilling rod afterbody of superhigh pressure, superhigh pressure water power pump station supplies water to the accurate slotting device that switches of the high low pressure of second cartridge formula, the accurate slotting device that switches of the high low pressure of first cartridge formula and drill bit through superhigh pressure hose and the sealed drilling rod of superhigh pressure, and the release governing valve is used for adjusting line pressure, and then controls the accurate slotting device that switches of the high low pressure of first cartridge formula and the accurate sealing and opening that switch the water circulation way in the slotting device of the high low pressure of second cartridge formula.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122426520.7U CN216477319U (en) | 2021-10-09 | 2021-10-09 | Plug-in type high-low pressure accurate switching slotting device and slotting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122426520.7U CN216477319U (en) | 2021-10-09 | 2021-10-09 | Plug-in type high-low pressure accurate switching slotting device and slotting device |
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| CN216477319U true CN216477319U (en) | 2022-05-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113882855A (en) * | 2021-10-09 | 2022-01-04 | 中煤科工集团沈阳研究院有限公司 | Plug-in type high-low pressure accurate switching slotting device, slotting device and using method |
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2021
- 2021-10-09 CN CN202122426520.7U patent/CN216477319U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113882855A (en) * | 2021-10-09 | 2022-01-04 | 中煤科工集团沈阳研究院有限公司 | Plug-in type high-low pressure accurate switching slotting device, slotting device and using method |
| CN113882855B (en) * | 2021-10-09 | 2024-04-26 | 中煤科工集团沈阳研究院有限公司 | Plug-in type high-low voltage accurate switching slotting machine, slotting device and use method |
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