CN116575850A - Colliery is hydraulic shock nipple joint in pit - Google Patents
Colliery is hydraulic shock nipple joint in pit Download PDFInfo
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- CN116575850A CN116575850A CN202310786305.9A CN202310786305A CN116575850A CN 116575850 A CN116575850 A CN 116575850A CN 202310786305 A CN202310786305 A CN 202310786305A CN 116575850 A CN116575850 A CN 116575850A
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- impact
- piston
- inner tube
- driving
- transmission shaft
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- 210000002445 nipple Anatomy 0.000 title claims description 17
- 230000035939 shock Effects 0.000 title claims description 3
- 230000005540 biological transmission Effects 0.000 claims abstract description 48
- 238000007789 sealing Methods 0.000 claims abstract description 27
- 239000003245 coal Substances 0.000 claims abstract description 26
- 239000012530 fluid Substances 0.000 claims abstract description 20
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 238000005553 drilling Methods 0.000 claims abstract description 18
- 230000033001 locomotion Effects 0.000 claims abstract description 17
- 238000007667 floating Methods 0.000 claims description 21
- 210000004907 gland Anatomy 0.000 claims description 14
- 230000003116 impacting effect Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 239000011435 rock Substances 0.000 description 6
- 230000007704 transition Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000009527 percussion Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/06—Down-hole impacting means, e.g. hammers
- E21B4/14—Fluid operated hammers
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/18—Pipes provided with plural fluid passages
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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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/006—Mechanical motion converting means, e.g. reduction gearings
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The application relates to a hydraulic impact pup joint for underground coal mine, which belongs to the technical field of drilling tools and comprises an outer pipe, wherein an inner pipe coaxial with the outer pipe is arranged in the outer pipe, and a fluid flow passage is arranged between the outer pipe and the inner pipe; an impact mechanism is arranged in the inner tube and comprises a transmission shaft, one end of the transmission shaft is connected with a screw motor, and the other end of the transmission shaft is connected with a cam mechanism; the cam mechanism comprises a cylindrical cam and a driving piston arranged outside the cylindrical cam, and a guide groove matched with a convex structure arranged inside the driving piston is arranged in the circumferential direction of the cylindrical cam so as to drive the driving piston to do linear reciprocating motion along the axial direction of the inner tube; the driving piston is connected with a driving disc positioned below the driving piston; an impact piston is arranged below the driving disc, and a punch is arranged below the impact piston to impact the drill bit. According to the application, the rotary motion of the existing mature screw motor is converted into the reciprocating linear impact motion, so that the technical problem of high-pressure sealing of the hydraulic hammer is solved, the water quality is not strictly required, and the hydraulic hammer is suitable for underground impact rotary drilling of coal mines.
Description
Technical Field
The application belongs to the technical field of drilling tools, and relates to a hydraulic impact nipple under a coal mine.
Background
The impact rotary drilling technology is the most effective technology for solving the difficult drilling problem of hard rock stratum, a hydraulic impact device (hereinafter referred to as a hydraulic hammer) is used as an important part of an impact rotary drilling tool, the hydraulic hammer is driven by high-pressure water as a working medium, impact energy is generated by means of pressure difference between the front and rear of a piston to generate high-frequency impact force, metal sealing of a piston sealing surface is a key of pressure difference generation, however, the piston sealing surface is worn seriously due to long-term high-pressure water impact and high-temperature environment, and when the piston sealing surface is worn to a certain extent, the pressure difference between the front and rear of the piston sealing surface is insufficient to provide enough impact force for the piston, and the hydraulic hammer is considered to be invalid at the moment.
In order to improve the service life of the hydraulic hammer, the wear resistance of the piston is improved by improving the structural design, adopting heat treatment processes such as quenching, nitriding and the like, and a certain effect is obtained. However, in the coal mine drilling construction, the drilling fluid directly adopts underground water, corrosive substances and tiny particles are contained in the underground water, abrasion is very serious under the environments of impact, corrosion and abrasive particles, a sealing surface of a piston is quickly failed, so that the impact force of a hydraulic hammer is reduced, and the service life of the hydraulic hammer forming the impact force by means of high-pressure water at two ends of the sealing of the piston is difficult to improve under the coal mine tunnel environment.
Disclosure of Invention
Therefore, the application aims to provide the underground hydraulic impact nipple for the coal mine so as to solve the problem that the conventional hydraulic hammer is short in service life in the underground coal mine.
In order to achieve the above purpose, the present application provides the following technical solutions:
the underground hydraulic impact pup joint for the coal mine comprises an outer pipe, wherein an inner pipe coaxial with the outer pipe is arranged in the outer pipe, and a fluid flow passage is arranged between the outer pipe and the inner pipe for conveying drilling fluid; the inner tube is internally provided with a percussion mechanism for impacting the drill bit, the percussion mechanism comprises a transmission shaft, one end of the transmission shaft is connected with a screw motor for driving the screw motor to rotate, and the other end of the transmission shaft penetrates through an end cover which is positioned at the top of the inner tube and is fixedly connected with the outer tube and is connected with a cam mechanism positioned below the end cover; the cam mechanism comprises a cylindrical cam and a driving piston arranged outside the cylindrical cam, and a guide groove matched with a convex structure arranged inside the driving piston is formed in the circumferential direction of the cylindrical cam so as to form cam transmission to drive the driving piston to do linear reciprocating motion along the axial direction of the inner tube; the driving piston is connected with a driving disc which is positioned below the driving piston and is in sliding connection with the inner tube; the driving disc, the driving piston and the inner tube enclose a first sealing cavity; an impact piston is arranged below the driving disc, and a second sealing cavity is formed by enclosing the impact piston, the driving disc and the inner tube; a punch is arranged below the impact piston to impact a drill bit below the punch; the punch comprises an upper section, a middle section and a lower section which are sequentially arranged from top to bottom; the upper section passes through and extends out of an impact plug which is arranged at the bottom of the inner tube and is fixedly connected with the outer tube, and the extending end is sleeved with a reset spring; the outer diameter of the middle section is larger than that of the upper section and the lower section, and the middle section is in sliding connection with the outer tube; pressure balance holes are respectively arranged between the driving disc and the driving piston and between the impact piston and the impact plug so as to enable the space between the driving disc and the driving piston to be communicated with the space between the impact piston and the impact plug.
Optionally, a limiting device is arranged below the punch to prevent idle striking, the limiting device comprises a limiting buffer pad fixed on the inner side of the outer tube and/or a resistance spring sleeved on the lower section of the punch, the resistance spring is supported on a spring supporting seat positioned below the resistance spring, and the spring supporting seat is fixed on the outer tube.
Optionally, the transmission shaft is in floating connection with the cylindrical cam, and the transmission shaft limits the axial movement of the transmission shaft through a transmission shaft step surface positioned below the end cover and a shaft fixing ring positioned above the end cover and in threaded connection with the transmission shaft; the transmission shaft is connected with the cylindrical cam through a spline, the cylindrical cam is sleeved on a spline gland of the transmission shaft to limit the axial position of the cylindrical cam, the spline gland is in sliding connection with the transmission shaft, the inner hole of the spline gland is smaller than the outer diameter of a spline at the end part of the transmission shaft, and the spline gland is fixedly connected with the cylindrical cam through threads.
Optionally, the driving piston is connected with the driving disk arranged below the driving piston in a floating way through a floating connection structure, the floating connection structure is a spherical floating connection structure, the floating connection structure comprises a connecting rod and a ball connecting rod which are connected through a spherical surface, the other end of the connecting rod is fixedly connected with the driving piston, and the other end of the ball connecting rod is fixedly connected with the driving disk.
Optionally, the driving piston is in spline connection with the inner tube.
Optionally, a plurality of grooves parallel to the axial direction are circumferentially arranged on the end cover, the inner tube and the impact plug, and the grooves among the end cover, the inner tube and the impact plug are communicated to form a fluid flow passage.
Optionally, the inner tube comprises an upper inner tube and a lower inner tube which are arranged up and down, the top of the upper inner tube is connected with the end cover, the connection position of the upper inner tube and the lower inner tube is not lower than the upper limit position of the driving disc, and the bottom end of the lower inner tube is connected with the impact plug; the inner part of the lower inner tube is provided with a sliding tube which is limited by an upper inner tube and an impact plug which are respectively arranged at the upper end and the lower end of the sliding tube.
Optionally, sealing rings are arranged among the driving disc, the impact piston and the inner tube so as to form a sealing space between the driving disc and the impact piston.
Optionally, the protruding structure is cylindrical.
Optionally, the end cover, the impact plug and the outer tube are detachably connected.
The application has the beneficial effects that: the rotary motion of the existing mature screw motor is converted into reciprocating linear impact motion, the technical problem of high-pressure sealing of a hydraulic hammer is avoided, the water quality is not strictly required, and the hydraulic hammer is suitable for underground impact rotary drilling of coal mines.
Additional advantages, objects, and features of the application will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the application. The objects and other advantages of the application may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a hydraulic impact nipple under a coal mine;
FIG. 2 is a schematic view of a cam mechanism;
FIG. 3 is a cross-sectional view A-A of FIG. 1;
fig. 4 is a diagram of the movement trace of the cam mechanism.
The graphic indicia: the device comprises a transmission shaft 1, a spline gland 2, a cylindrical cam 3, a driving piston 4, a connecting rod 5, a ball connecting rod 6, an impact piston 7, a return spring 8, a punch 9, a resistance spring 10, a spring support seat 11, a semicircular clamp 12, a drill bit 13, a lower outer tube 14, a drill bit pressing sleeve 15, a limit cushion 16, an impact plug 17, a sliding tube 18, a lower inner tube 19, a driving disc 20, a pressure balance hole 21, a fluid runner 22, an upper outer tube 23, an upper inner tube 24, an end cover 25, a shaft fixing ring 26, a guide groove 301 and a protruding structure 401.
Detailed Description
Other advantages and effects of the present application will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present application with reference to specific examples. The application may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present application. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present application by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the application; for the purpose of better illustrating embodiments of the application, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the application correspond to the same or similar components; in the description of the present application, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present application and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present application, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1-4, a hydraulic impact nipple for underground coal mine comprises an outer pipe, wherein an inner pipe coaxial with the outer pipe is arranged in the outer pipe, and a fluid flow passage 22 is arranged between the outer pipe and the inner pipe for conveying drilling fluid; the inner tube is internally provided with an impact mechanism for impacting the drill bit 13, the impact mechanism comprises a transmission shaft 1, one end of the transmission shaft 1 is connected with a screw motor for driving the screw motor to rotate, and the other end of the transmission shaft passes through an end cover 25 which is positioned at the top of the inner tube and fixedly connected with the outer tube and is connected with a cam mechanism positioned below the end cover 25; the cam mechanism comprises a cylindrical cam 3 and a driving piston 4 arranged outside the cylindrical cam 3, a guide groove 301 matched with a convex structure 401 arranged inside the driving piston 4 is arranged in the circumferential direction of the cylindrical cam 3 to form cam transmission to drive the driving piston 4 to do linear reciprocating motion along the axial direction of the inner tube; the driving piston 4 is connected with a driving disk 20 which is positioned below the driving piston and is in sliding connection with the inner pipe; the driving disk 20, the driving piston 4 and the inner tube enclose a first sealing cavity; an impact piston 7 is arranged below the driving disk 20, and a second sealing cavity is formed by the impact piston 7, the driving disk 20 and the inner pipe; a punch 9 is provided below the impact piston 7 to impact a drill bit 13 located below the punch 9; the punch 9 comprises an upper section, a middle section and a lower section which are sequentially arranged from top to bottom; the upper section passes through and extends out of an impact plug 17 which is arranged at the bottom of the inner tube and is fixedly connected with the outer tube, and the extending end is sleeved with a reset spring 8; the outer diameter of the middle section is larger than that of the upper section and the lower section, and the middle section is in sliding connection with the outer tube; pressure balance holes 21 are provided between the driving disc 20 and the driving piston 4, and between the impact piston 7 and the impact plug 17, so that the space between the driving disc 20 and the driving piston 4 is communicated with the space between the impact piston 7 and the impact plug 17. Sealing rings are arranged among the driving disc 20, the impact piston 7 and the inner tube so as to form a sealing space between the driving disc 20 and the impact piston 7.
The screw motor is used in underground coal mine, the drilling length of the screw motor is as high as ten thousand meters, the service life of the screw motor and the requirement on water quality completely meet the requirement of coal mine drilling construction, a new thought is provided for solving the problem of sealing failure of a hydraulic hammer, and the screw motor only can provide rotary work, so that the rotary motion of the screw motor needs to be converted into linear reciprocating impact motion. The application realizes the function of converting the rotary motion of the screw motor into the linear reciprocating motion by arranging the cam mechanism, avoids the high-pressure sealing structure of the piston, so that the problem of water quality of underground water of a coal mine is not limited by the underground impact rotary drilling technology of the coal mine, solves the problem of short service life of the conventional hydraulic hammer in the underground coal mine, and has wide engineering application prospect in the field of the coal mine.
In order to prevent idle striking, a limiting device is arranged below a punch 9 to prevent idle striking, the limiting device comprises a limiting buffer pad 16 fixed on the inner side of an outer tube and/or a resistance spring 10 sleeved on the lower section of the punch, the resistance spring 10 is supported on a spring supporting seat 11 positioned below the resistance spring, and the spring supporting seat 11 is fixed on the outer tube.
In order to solve the problem of non-concentricity of the input end, the transmission shaft 1 and the cylindrical cam 3 are in floating connection. The transmission shaft 1 limits the axial movement of the transmission shaft 1 through a step surface of the transmission shaft 1 below the end cover 25 and a shaft fixing ring 26 which is positioned above the end cover 25 and is in threaded connection with the transmission shaft 1; the transmission shaft 1 is connected with the cylindrical cam 3 through a spline, the cylindrical cam 3 is sleeved on a spline gland 2 of the transmission shaft 1 to limit the axial position of the cylindrical cam, the spline gland 2 is in sliding connection with the transmission shaft 1, the inner hole of the spline gland 2 is smaller than the spline outer diameter of the end part of the transmission shaft 1, and the spline gland 2 is fixedly connected with the cylindrical cam 3 through threads.
In order to solve the problem of non-concentricity of the output end, the driving piston 4 and the driving disk 20 of the application are in floating connection. The driving piston 4 is in floating connection with the driving disc 20 arranged below the driving piston 4 through a floating connection structure, the floating connection structure is a spherical floating connection structure, the floating connection structure comprises a connecting rod 5 and a ball connecting rod 65 which are connected through a spherical surface, the other end of the connecting rod 5 is fixedly connected with the driving piston 4, and the other end of the ball connecting rod 65 is fixedly connected with the driving disc 20.
In order to improve the stress of the driving piston 4, the driving piston 4 and the inner pipe are connected through a spline. Such a connection structure enables the guide groove 301 of the cylindrical cam 3 to cancel out the force applied to the drive piston 4 in the radial direction by the boss structure 401 by the key groove between the drive piston 4 and the upper inner tube 24, thus allowing the drive piston 4 to receive only the component force in the axial direction.
The fluid flow path 22 of the present application may be formed by: a plurality of grooves parallel to the axial direction are arranged in the circumferential direction of the end cover 25, the inner tube and the impact plug 17, and the grooves among the end cover 25, the inner tube and the impact plug 17 are communicated to form a fluid flow passage 22.
In order to facilitate assembly and manufacture, the application adopts a split structure of the inner tube and the outer tube. The inner tube comprises an upper inner tube 24 and a lower inner tube 19 which are arranged up and down, the top of the upper inner tube 24 is connected with an end cover 25, the connection position of the upper inner tube 24 and the lower inner tube 19 is not lower than the upper limit position of the driving disc 20, and the bottom end of the lower inner tube 19 is connected with the impact plug 17; the inner part of the lower inner tube 19 is provided with a sliding tube 18, and the sliding tube 18 is limited by an upper inner tube 24 and an impact plug 17 which are respectively arranged at the upper end and the lower end of the sliding tube. The outer tube comprises an upper outer tube 23 and a lower outer tube 14 arranged one above the other.
The boss 401 of the present application is preferably cylindrical and the connection between the end cap 25, the impact plug 17 and the outer tube is preferably a removable connection, such as a threaded connection.
Examples
The utility model provides a colliery is hydraulic impact nipple joint in pit, adopt the layering design, set up impact mechanism in the inner tube, set up fluid runner 22 in the inner tube periphery, shown in fig. 1-4, the transmission shaft 1 is shown in the figure, spline gland 2, cylindrical cam 3, driving piston 4, connecting rod 5, bulb connecting rod 6, impact piston 7, reset spring 8, drift 9, resistance spring 10, spring supporting seat 11, semicircle card 12, drill bit 13, down outer tube 14, drill bit cover 15, spacing blotter 16, strike end cap 17, slide tube 18, down inner tube 19, driving disk 20, pressure balance hole 21, fluid runner 22, upper outer tube 23, upper inner tube 24, end cover 25, axle solid fixed ring 26, guide way 301, protruding structure 401. The outer surfaces of the end cover 25, the upper inner pipe 24, the lower inner pipe 19 and the impact plug 17 are provided with a plurality of grooves, the end cover 25, the upper inner pipe 24, the lower inner pipe 19 and the impact plug 17 are embedded into the upper outer pipe 23, and the upper grooves and the lower grooves are mutually communicated to form a fluid flow passage 22. A circle of guide groove is arranged on the outer surface of the cylindrical cam 3, the guide groove is divided into an impact stroke-transition section-return-transition section, a driving piston 4 is arranged on the circumference of the cylindrical cam 3, a protruding structure 401 is arranged on the inner surface of the driving piston 4 in the radial direction, and the protruding structure 401 is embedded into the guide groove of the cylindrical cam 3 to form cam transmission. The drive piston 4 is splined to the upper inner tube 24, the drive piston 4 being only axially movable. The driving piston 4 is in floating connection with the driving disc 20 through a spherical floating connection structure, so that the driving disc 20 and the driving piston 4 can be prevented from being blocked due to non-concentricity. The driving disc 20 is provided with a sealing ring on the outer surface, the impact piston 7 is provided with a sealing ring on the outer surface, a sealing space is formed between the driving disc 20 and the impact piston 7, the sealing space is filled with compressible gas with a certain pressure, and the compressed gas can store the kinetic energy of the impact piston 7. A resistance spring 10 and a limit cushion 16 are arranged below the punch 9. Pressure balance holes 21 are arranged between the driving disc 20 and the driving piston 4 and between the impact piston 7 and the impact plug 17, and the pressure balance holes 21 enable the space between the driving disc 20 and the driving piston 4 and the space between the impact piston 7 and the impact plug 17 to be communicated.
The working principle is as follows: the transmission shaft 1 is connected with a screw motor, the screw motor drives the transmission shaft 1 to rotate, and the transmission shaft 1 drives the cylindrical cam 3 to rotate. The guide groove 301 of the cylindrical cam 3 applies force components in the axial direction and the radial direction to the driving piston 4 through the protrusion structure 401, and the force in the radial direction is offset by the key groove between the driving piston 4 and the upper inner tube 24, so that the driving piston 4 receives only the force component in the axial direction, and the driving piston 4 makes a linear reciprocating motion according to the contour of the guide groove 301 of the cylindrical cam 3. The drilling fluid passes through the upper cover 24, the upper inner tube 24, the lower inner tube 19, the fluid flow passage 22 between the impact plug 17 and the upper outer tube 23 and reaches the drill bit 13 to realize the circulation of the drilling fluid.
Impact rock crushing process: the following description will be made with reference to fig. 4 and 1 on the process of impacting broken rock, the drill bit 13 is propped against rock, the drill bit 13 is contracted to an upper limit position, the drill bit 13 is propped against the punch 9, the zero point in fig. 4 is used as a rotation starting position of the cylindrical cam 3, the cylindrical cam 3 rotates to drive the driving piston 4 to move downwards, the driving piston 4 drives the driving disc 20 to move downwards, the driving disc 20 compresses the gas in the airtight space, the gas pressure increases to push the impact piston 7 to move downwards, the cylindrical cam 3 enters a transition section, the impact piston 7 just contacts the punch 9 at an impact stroke end position, the impact force is transmitted to the rock, the speed of the impact piston 7 is rapidly reduced to zero, after the cylindrical cam 3 enters a return section, the driving piston 4 drives the driving disc 20 to move upwards, the gas above the driving disc 20 enters the lower part of the impact piston 7 through the pressure balance hole 21, the impact piston 7 moves upwards under the combined action of the gas pressure and the return spring 8, the cylindrical cam 3 enters the transition section, the driving disc 20 stops moving briefly, the kinetic energy of the impact piston 4 is converted into gas pressure energy between the driving disc 20 and the driving piston 4 to store, and the next cycle after the transition section is completed by the cylindrical cam 3.
Air defense function: the following describes the idle striking prevention function with reference to fig. 4, the drill bit 13 is not against the rock, the drill bit 13 is not against the punch 9, the zero point of fig. 4 is used as the rotation starting position of the cylindrical cam 3, the cylindrical cam 3 rotates, the driving piston 4 drives the driving disc 20 to move downwards, the driving disc 20 compresses the air in the airtight space, the air pressure increases to push the impact piston 7 to move downwards, the impact piston 7 just contacts the punch 9 at the end position of the impact stroke, the cylindrical cam 3 enters the transition section, the driving disc 20 stops briefly, the impact piston 7 and the punch 9 move downwards under the action of the resistance spring 10, finally the punch 9 contacts the limit cushion 16, the impact piston 7 and the punch 9 decelerate to zero, the cylindrical cam 3 enters the return section, the driving piston 4 drives the driving disc 20 to move upwards, the air above the driving disc 20 enters the lower part of the impact piston 7 through the pressure balance hole 21, the impact piston 7 moves upwards under the combined action of the air pressure and the return spring 8, the cylindrical cam 3 enters the transition section, the driving disc 20 stops moving, the kinetic energy of the impact piston 7 is converted into the air energy between the driving disc 20 and the impact piston 7 to store the air energy, and the cylindrical cam enters the next cycle briefly.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present application, which is intended to be covered by the claims of the present application.
Claims (10)
1. The utility model provides a colliery is hydraulic shock nipple joint in pit which characterized in that: the drilling fluid conveying device comprises an outer pipe, wherein an inner pipe coaxial with the outer pipe is arranged in the outer pipe, and a fluid flow passage (22) is arranged between the outer pipe and the inner pipe for conveying drilling fluid; the inner tube is internally provided with an impact mechanism for impacting the drill bit (13), the impact mechanism comprises a transmission shaft (1), one end of the transmission shaft (1) is connected with a screw motor for driving the screw motor to rotate, and the other end of the transmission shaft passes through an end cover (25) which is positioned at the top of the inner tube and fixedly connected with the outer tube and is connected with a cam mechanism positioned below the end cover (25); the cam mechanism comprises a cylindrical cam (3) and a driving piston (4) arranged outside the cylindrical cam (3), a guide groove (301) matched with a convex structure (401) arranged inside the driving piston (4) is formed in the circumferential direction of the cylindrical cam (3) so as to form cam transmission to drive the driving piston (4) to do linear reciprocating motion along the axial direction of the inner tube; the driving piston (4) is connected with a driving disc (20) which is positioned below the driving piston and is in sliding connection with the inner tube; the driving disc (20), the driving piston (4) and the inner tube enclose a first sealing cavity; an impact piston (7) is arranged below the driving disc (20), and a second sealing cavity is formed by the impact piston (7), the driving disc (20) and the inner tube in a surrounding mode; a punch (9) is arranged below the impact piston (7) to impact a drill bit (13) below the punch (9); the punch (9) comprises an upper section, a middle section and a lower section which are sequentially arranged from top to bottom; the upper section passes through and extends out of an impact plug (17) which is arranged at the bottom of the inner tube and is fixedly connected with the outer tube, and the extending end is sleeved with a reset spring (8); the outer diameter of the middle section is larger than that of the upper section and the lower section, and the middle section is in sliding connection with the outer tube; pressure balance holes (21) are respectively arranged between the driving disc (20) and the driving piston (4) and between the impact piston (7) and the impact plug (17) so as to enable the space between the driving disc (20) and the driving piston (4) to be communicated with the space between the impact piston (7) and the impact plug (17).
2. A downhole hydraulic impact nipple for a coal mine according to claim 1, wherein: the lower part of the punch head (9) is provided with a limiting device for preventing idle striking, the limiting device comprises a limiting buffer pad (16) fixed on the inner side of the outer tube and/or a resistance spring (10) sleeved on the lower section of the punch head, the resistance spring (10) is supported on a spring supporting seat (11) positioned below the resistance spring, and the spring supporting seat (11) is fixed on the outer tube.
3. A downhole hydraulic impact nipple for a coal mine according to claim 1, wherein: the transmission shaft (1) is in floating connection with the cylindrical cam (3), and the transmission shaft (1) limits the axial movement of the transmission shaft through a transmission shaft step surface positioned below the end cover (25) and a shaft fixing ring (26) positioned above the end cover (25) and in threaded connection with the transmission shaft (1); the transmission shaft (1) is connected with the cylindrical cam (3) through a spline, the cylindrical cam (3) is sleeved on a spline gland (2) of the transmission shaft (1) to limit the axial position of the cylindrical cam, the spline gland (2) is in sliding connection with the transmission shaft (1), the inner hole of the spline gland (2) is smaller than the spline outer diameter of the end part of the transmission shaft (1), and the spline gland (2) is fixedly connected with the cylindrical cam (3) through threads.
4. A downhole hydraulic impact nipple for a coal mine according to claim 1, wherein: the driving piston (4) is in floating connection with the driving disc (20) arranged below the driving piston through a floating connection structure, the floating connection structure is a spherical floating connection structure, the floating connection structure comprises a connecting rod (5) and a ball connecting rod (6) which are connected through a spherical surface, the other end of the connecting rod (5) is fixedly connected with the driving piston (4), and the other end of the ball connecting rod (6) is fixedly connected with the driving disc (20).
5. A downhole hydraulic impact nipple for a coal mine according to claim 1, wherein: the driving piston (4) is connected with the inner pipe through a spline.
6. A downhole hydraulic impact nipple for a coal mine according to claim 1, wherein: the end cover (25), the inner tube and the impact plug (17) are circumferentially provided with a plurality of grooves parallel to the axial direction, and the grooves among the end cover (25), the inner tube and the impact plug (17) are communicated to form a fluid flow passage (22).
7. A downhole hydraulic impact nipple for a coal mine according to claim 1, wherein: the inner tube comprises an upper inner tube (24) and a lower inner tube (19) which are arranged up and down, the top of the upper inner tube (24) is connected with an end cover (25), the connection position of the upper inner tube (24) and the lower inner tube (19) is not lower than the upper limit position of the driving disc (20), and the bottom end of the lower inner tube (19) is connected with the impact plug (17); the inside of the lower inner tube (19) is provided with a sliding tube (18), and the sliding tube (18) is limited by an upper inner tube (24) and an impact plug (17) which are respectively arranged at the upper end and the lower end of the sliding tube.
8. A downhole hydraulic impact nipple for a coal mine according to claim 1, wherein: sealing rings are arranged among the driving disc (20), the impact piston (7) and the inner tube so as to form a sealing space between the driving disc (20) and the impact piston (7).
9. A downhole hydraulic impact nipple for a coal mine according to claim 1, wherein: the raised structures (401) are cylindrical.
10. A downhole hydraulic impact nipple for a coal mine according to claim 1, wherein: the end cover (25), the impact plug (17) and the outer tube are detachably connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310786305.9A CN116575850A (en) | 2023-06-29 | 2023-06-29 | Colliery is hydraulic shock nipple joint in pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310786305.9A CN116575850A (en) | 2023-06-29 | 2023-06-29 | Colliery is hydraulic shock nipple joint in pit |
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| Publication Number | Publication Date |
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| CN116575850A true CN116575850A (en) | 2023-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310786305.9A Pending CN116575850A (en) | 2023-06-29 | 2023-06-29 | Colliery is hydraulic shock nipple joint in pit |
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| CN (1) | CN116575850A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117365304A (en) * | 2023-12-06 | 2024-01-09 | 山西省地球物理化学勘查院有限公司 | Drill bit for geological exploration |
-
2023
- 2023-06-29 CN CN202310786305.9A patent/CN116575850A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117365304A (en) * | 2023-12-06 | 2024-01-09 | 山西省地球物理化学勘查院有限公司 | Drill bit for geological exploration |
| CN117365304B (en) * | 2023-12-06 | 2024-02-27 | 山西省地球物理化学勘查院有限公司 | Drill bit for geological exploration |
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