CN113216937B - Dynamic comprehensive performance test method and device for coal mine drill rod - Google Patents
Dynamic comprehensive performance test method and device for coal mine drill rod Download PDFInfo
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- CN113216937B CN113216937B CN202110699074.9A CN202110699074A CN113216937B CN 113216937 B CN113216937 B CN 113216937B CN 202110699074 A CN202110699074 A CN 202110699074A CN 113216937 B CN113216937 B CN 113216937B
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- 239000003245 coal Substances 0.000 title claims abstract description 27
- 238000011056 performance test Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 104
- 238000005553 drilling Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000006073 displacement reaction Methods 0.000 claims abstract description 24
- 238000010276 construction Methods 0.000 claims abstract description 18
- 239000002131 composite material Substances 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims description 44
- 238000001514 detection method Methods 0.000 claims description 15
- 239000003638 chemical reducing agent Substances 0.000 claims description 13
- 230000000737 periodic effect Effects 0.000 claims description 11
- 230000001052 transient effect Effects 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 5
- 238000002474 experimental method Methods 0.000 claims description 2
- 230000033001 locomotion Effects 0.000 description 8
- 238000010998 test method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001141 propulsive effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
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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
- E21B44/00—Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
- E21B44/02—Automatic control of the tool feed
- E21B44/04—Automatic control of the tool feed in response to the torque of the drive ; Measuring drilling torque
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geophysics (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Earth Drilling (AREA)
Abstract
The invention relates to a dynamic comprehensive performance test method and a device for a coal mine drill rod, belonging to the field of comprehensive performance tests of the coal mine drill rod, wherein a torque loading system for simulating the stress state of a power end of the drill rod and a load system for simulating the stress state of a drilling end of the drill rod are respectively arranged at two ends of a test drill rod, and an axial force loading system for loading a controllable axial load on the test drill rod, a radial constraint system for simulating radial displacement constraint and radial force loading on the drill rod in loading construction and a high-pressure or ultrahigh-pressure water path loading system for loading a certain pressure on the test drill rod are arranged; the controllable and composite dynamic loading of the load of the test drill rod can be realized, the comprehensive performance of the drill rod under the working conditions of steady and dynamic loads of drilling construction, drill rod whirling, drill rod vibration and resonance, revolution and rotation centrifugal force can be simulated, and the problem that the comprehensive stress and dynamic load model of the drill rod cannot be simulated in the prior art is solved.
Description
Technical Field
The invention belongs to the field of comprehensive performance tests of drill rods for coal mine drilling, and relates to a dynamic comprehensive performance test method and device for coal mine drill rods.
Background
Along with the gradual improvement of the construction depth of coal mine gas extraction drilling, geological advanced detection drilling, water disaster treatment and water detection and drainage drilling, the control and operation mode is developed towards automation and no humanization, and higher requirements are put forward on the quality and comprehensive performance of the drill rod. Therefore, the fatigue life of the drill rod, the stability of the drill rod under the comprehensive load and the strength of the drill rod under various stress and motion conditions need to be tested under complex stress conditions and motion conditions, so as to test whether the drill rod can meet the process requirements of deep drilling in the underground coal mine, and provide theoretical basis for the design of the drilling process.
At present, a test method for a drilling tool for a coal mine mainly uses a test device and a test method for torsional strength of a tubular material, and does not have a test device and a test method which are specially used for testing the comprehensive performance of the drilling tool for the coal mine.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for testing dynamic comprehensive performance of a drill rod for coal mine, so as to simulate a comprehensive stress state of the drill rod.
In order to achieve the purpose, the invention provides the following technical scheme:
a dynamic comprehensive performance test method for a coal mine drill rod is characterized in that a torque loading system for simulating the stress state of a power end of the drill rod and a load system for simulating the stress state of a drilling end of the drill rod are respectively arranged at two ends of the test drill rod, an axial force loading system for loading a controllable axial load on the test drill rod, a radial constraint system for simulating radial displacement constraint and radial force loading on the drill rod in loading construction and a waterway loading system for loading high-pressure or ultrahigh-pressure water pressure with certain pressure on the test drill rod are arranged; the load of the test drill rod is controllably and compositely dynamically loaded through the torque loading system, the axial force loading system, the radial constraint system, the load system and the waterway loading system, and the comprehensive performance of the drill rod under the working conditions of drilling construction steady-state and dynamic load, drill rod whirling, drill rod vibration and resonance, revolution and autorotation centrifugal force is simulated.
Optionally, the composite and controllable simulated composite load applied to the test drill rod simultaneously comprises torque, propelling force, radial displacement constraint and dynamic radial force of the drill rod by the drill hole, dynamic reaction torque of the drill rod at the bottom of the hole for cutting rocks, and dynamic hydraulic load, so as to realize controllable and dynamic loading of combination of multiple loads and constraints.
Optionally, the radial constraint system constrains the bending half-wave, the revolution radius and the radial displacement of the test drill rod to simulate half-wave constraint, revolution constraint and radial displacement constraint of the drill rod in loading construction.
Optionally, the radial constraint system includes more than 3 radial constraint devices, the radial limitation of the radial constraint device on the test drill rod is configured according to the combination of the drill hole diameter and the drill rod diameter, and the constraint distance of the radial constraint device on the test drill rod is equal to a half wavelength generated by matching the test drill rod with the experiment parameters, or equal to the constraint length of the test drill hole on the drill rod.
Optionally, the axial force loading system simulates and outputs a steady-state or dynamic propelling force according to the propelling cutting resistance, the sliding friction resistance, the drilling constraint transient impact and the periodic variable load, detects the output thrust through the thrust measuring device, and controls the loading of the propelling force in a feedback mode.
Optionally, the waterway loading system is composed of a pressurized waterway, a loading water pump and a waterway load system, the hydraulic pressure required by the loading water pump loading test is transmitted to the test drill rod through the pressurized waterway, and the flow and the impact of the hydraulic pressure are adjusted by the waterway load system.
Optionally, the load system simulates and outputs a steady-state torque, a dynamic variable load torque, an impact torque and a periodic impact torque according to cutting reaction torque in a drill hole, rotation and sliding transient friction resistance and periodic and instantaneous impact loads generated by radial constraint of the drill pipe by the drill hole, and realizes feedback control on the torque load system and the load system by detecting the torque and the rotating speed of the test drill pipe.
A dynamic comprehensive performance test device for a coal mine drill rod comprises a torque loading system and a load system which are respectively arranged at two ends of a test drill rod, wherein the torque loading system comprises a variable-speed driving device and a torque loading device connected with the variable-speed driving device; the load system comprises a torque load device, a torque rotating speed detection device, a load reduction device and a load device, wherein the load device is connected with the load reduction device through a load transmission shaft, the load reduction device is connected with the torque rotating speed detection device through a torque transmission device, the torque rotating speed detection device is connected with the torque load device through the torque transmission device, and the torque load device is connected with the test drill rod; the device also comprises an axial force loading system arranged at one end of the test drill rod to realize loading of controllable axial load on the test drill rod, a radial constraint system used for simulating radial displacement constraint and radial force loading of the drill rod in loading construction, and a high-pressure or ultrahigh-pressure water path loading system used for loading a certain pressure on the test drill rod.
The invention has the beneficial effects that:
1. the invention provides an accurate and reliable test method and device for the drilling tool for coal mine drilling, and can test various stress and motion models of the drilling tool.
2. The invention can test the fatigue life of the drilling tool, the stability of cutting load transmission under the comprehensive load, the tightness of power water transmission in the drilling tool under the comprehensive load and the strength of the drilling tool under various stress and motion conditions.
3. The invention simultaneously applies composite and controllable simulation loads to the test drilling tool, including loading torque, propelling force, radial displacement constraint and dynamic radial force of the drilling tool on the drilling tool, dynamic reaction torque of the drilling tool at the bottom of the hole for cutting rocks and dynamic hydraulic pressure load, and can carry out composite loading test on various loads and constraints.
4. The invention realizes the controllable and dynamic loading of the combination of multiple loads and constraints, and simulates the comprehensive performance of the test drilling tool under the working conditions of steady state, dynamic load, drilling tool whirling, drilling string vibration and resonance, revolution, autorotation centrifugal force and the like of drilling construction.
Additional advantages, objects, and features of the invention 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 invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a first schematic structural diagram of a testing apparatus according to the present invention;
FIG. 2 is a schematic structural diagram II of the testing apparatus of the present invention;
FIG. 3 is a schematic structural diagram of a torque loading device;
FIG. 4 is a first schematic view of a radial constraint device;
FIG. 5 is a second schematic view of the radial constraint device;
FIG. 6 is a schematic structural view of a torque loading apparatus;
FIG. 7 is a first schematic structural diagram of a load device;
FIG. 8 is a second schematic structural view of a load device;
FIG. 9 is a first schematic structural view of a slide rail;
FIG. 10 is a second schematic structural view of a slide rail;
FIG. 11 is a first schematic view of the impact load brake;
fig. 12 is a second structural view of the impact load brake.
Reference numerals: the device comprises a loading motor 1, a loading connecting device 2, an automatic transmission 3, a loading speed reducer 4, a pressurized water path 5, a loading water pump 6, an axial force loading system 7, a torque loading device 8, a radial constraint device 9, a torque loading device 10, a torque rotating speed detection device 11, a load speed reducer 12, a load device 13, a composite bearing platform 14, a test drill rod 15, a water path loading system 16, a first clamping device 8-1, a first force bearing base 8-2, a first oil supply device 8-3, a first rotary oil distribution assembly 8-4, a first bearing thrust base 8-5, a first end cover 8-6, a first main shaft 8-7, a first thrust bearing 8-8, a radial constraint base 9-1, a sliding shaft 9-2, a position sensor 9-3, a drill rod constraint base 9-4, a second end cover 8-6, a first main shaft 8-7, a second thrust bearing 8-8, a radial constraint base 9-1, a sliding shaft 9-2, a position sensor 9-3, a drill rod constraint base 9-4, 9-5 parts of a sliding sleeve, 9-6 parts of an oil seal ring, 9-7 parts of a third end cover, 9-8 parts of a thrust sleeve, 9-9 parts of a force transmission shaft, 9-10 parts of a third thrust bearing, 9-11 parts of a radial limiting ring, 9-12 parts of a servo oil cylinder, 10-1 parts of a second clamping device, 10-2 parts of a second force bearing base, 10-3 parts of a second oil supply device, 10-4 parts of a second rotary oil distribution assembly, 10-5 parts of a second bearing thrust base and 10-6 parts of a thrust measuring device, the device comprises a second main shaft 10-7, a second end cover 10-8, a second thrust bearing 10-9, a load base 13-1, a tension servo oil cylinder 13-2, a pull rod 13-3, a slide rail 13-4, an impact load brake 13-5, a load transmission shaft 13-6 and an eddy current brake 13-7.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustration only and not for the purpose of limiting the invention, shown in the drawings are schematic representations and not in the form of actual drawings; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood 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 numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 12, a dynamic comprehensive performance testing method for a drill rod for a coal mine is provided, wherein a torque loading system for simulating a stress state of a power end of the drill rod and a load system for simulating a stress state of a drilling end of the drill rod are respectively arranged at two ends of a test drill rod 15, an axial force loading system 7 for loading a controllable axial load on the test drill rod 15, a radial constraint system for simulating radial displacement constraint and radial force loading on the drill rod in loading construction, and a waterway loading system for loading high-pressure or ultrahigh-pressure water pressure on the test drill rod 15 with a certain pressure are arranged; the load of the test drill rod 15 is controllably and compositely dynamically loaded through the torque loading system, the axial force loading system 7, the radial constraint system, the loading system and the waterway loading system, and the comprehensive performance of the drill rod under the working conditions of steady and dynamic load of drilling construction, drill rod whirling, drill rod vibration and resonance, revolution and autorotation centrifugal force is simulated.
Preferably, the composite and controllable simulated composite loads applied to the test drill rod 15 simultaneously comprise torque, thrust, radial displacement constraint and dynamic radial force of the drill rod by drilling, dynamic reaction torque of the drill rod at the bottom of the hole for cutting rocks, and dynamic hydraulic load, so as to realize controllable and dynamic loading of multiple loads and constraint combination.
Preferably, the radial restraint system restrains the bending half-wave, the revolution radius and the radial displacement of the test drill rod 15 so as to simulate the half-wave restraint, the revolution restraint and the radial displacement restraint of the drill rod in loading construction.
Preferably, the radial constraint system comprises more than 3 radial constraint devices 9, the radial limit of the test drill rod 15 of the radial constraint devices 9 is configured according to the combination of the drill hole diameter and the drill rod diameter, and the constraint distance of the radial constraint devices 9 to the test drill rod 15 is equal to half wavelength generated by matching the test drill rod 15 with experimental parameters or equal to the constraint length of the test drill hole to the drill rod.
Preferably, the axial force loading system 7 simulates and outputs a steady-state or dynamic propelling force according to the propelling cutting resistance, the sliding friction resistance, the drilling constraint transient impact and the periodic variable load, detects the output propelling force through the thrust measuring device, and controls the loading of the propelling force in a feedback mode.
Preferably, the waterway loading system is composed of a pressurized waterway 5, a loading water pump 6 and a waterway loading system 16, the hydraulic pressure required by the loading test is loaded by the loading water pump 6 and is transmitted to the test drill rod 15 through the pressurized waterway 5, and the flow and the impact of the hydraulic pressure are regulated by the waterway loading system 16.
Preferably, the load system simulates and outputs steady-state torque, dynamic variable load torque, impact torque and periodic impact torque according to cutting reaction torque in a drill hole, rotation and sliding transient friction resistance and periodic and instantaneous impact load generated by radial constraint of the drill pipe by the drill hole, and realizes feedback control on the torque load system and the load system by detecting the torque and the rotating speed of the test drill pipe.
A dynamic comprehensive performance test device for a coal mine drill rod comprises a composite bearing platform 14, and a loading motor 1, a loading connecting device 2, an automatic transmission 3, a loading speed reducer 4, a pressurizing water path 5, a loading water pump 6, an axial force loading system 7, a torque loading device 8, a radial constraint device 9, a torque loading device 10, a torque rotating speed detection device 11, a load speed reducer 12, a load device 13 and a water path load system 16 which are arranged on the composite bearing platform.
The loading motor 1, the loading connecting device 2, the automatic transmission 3 and the loading speed reducer 4 form a variable-speed driving device, the driving device is connected with the torque loading device 8 to form a torque loading system, and controllable torque is applied to the test drill rod 15; a load system is composed of a torque load device 10, a torque rotating speed detection device 11, a load speed reduction device 12 and a load device 13, and steady-state and dynamic variable-load torque is applied to a test drill rod 15; the axial force loading system 7 loads a controllable axial load on the test drill rod 15; the radial constraint system is composed of more than 3 radial constraint devices 9, and radial displacement constraint and radial force loading on the drill rod in loading construction are simulated; the waterway loading system is composed of the pressurizing waterway 5, the loading water pump 6 and the waterway loading system 16, and can load high pressure or ultrahigh water pressure with certain pressure on the test drill rod 15.
The loading motor 1 is connected with the automatic transmission 3 through a loading transmission shaft and is arranged on the loading connecting device 2, the automatic transmission 3 is connected with the loading speed reducer 4 through a torque transmission device, and the loading speed reducer 4 is connected with the torque loading device 8 through the torque transmission device; the load coupling 2 may be a coupling.
The torque loading device 8 comprises a first bearing base 8-2, a first main shaft 8-7, a first thrust bearing 8-8 for supporting the first main shaft 8-7, a first bearing thrust seat 8-5 for mounting the first thrust bearing 8-8, a first end cover 8-6 connected with the first bearing base 8-2 and used for pressing the first thrust bearing 8-8, a first rotary oil distribution assembly 8-4 connected with the main shaft, and a first oil supply device 8-3 matched with the first rotary oil distribution assembly 8-4, wherein the first oil supply device 8-3 is positioned on the first bearing base 8-2, and the main shaft is connected with a test drill rod 15 through a first clamping device 8-1. The loading torque is transmitted in sequence according to the connection sequence, the automatic transmission 3 can automatically shift gears according to the rotating speed and the torque, the loading motor 1 can control the output torque and the rotating speed, and the automatic transmission 3 and the loading motor 1 are matched and controlled to realize the controllable output of the rotating speed and the torque.
The load system is characterized in that a load device 13 is connected with a load speed reducing device 12 through a load transmission shaft 13-6, the load speed reducing device 12 is connected with a torque and rotating speed detecting device 11 through a torque transmission device, the torque and rotating speed detecting device 11 is connected with a torque load device 10 through the torque transmission device, a test drill rod 15 is clamped by a second clamping device 10-1 for loading, the load device 13 can generate controllable dynamic torque load, the controllable dynamic torque load is transmitted to the torque load device 10 through the load speed reducing device 12, and load is applied to the test drill rod 15; the eddy current brake 13-7 and the impact load brake 13-5 generate loads to be applied to the test drill rod 15, and steady-state torque, dynamic variable load torque, impact torque and periodic impact torque are output in a simulated mode; the torque/rotation speed detection device 11 detects the transmitted torque and rotation speed, and performs feedback control on the torque loading system and the load system.
The torque load device 10 is connected with a second spindle 10-7 through a second clamping device 10-1, a second thrust bearing 10-9, a thrust measuring device 10-6 and a second thrust bearing seat 10-5 are matched and sequentially connected with the second spindle 10-7, a second end cover 10-8 is connected to a first bearing base 8-2 to press the thrust measuring device 10-6 tightly, a second rotary oil distribution assembly 10-4 is connected to the second spindle 10-7, and a second oil supply device 10-3 is connected to a second bearing base 10-2 and matched with the second rotary oil distribution assembly 10-4; the thrust force is detected by the thrust measuring device 10-6, and the feedback control of the axial force is formed.
The load device 13 consists of a load base 13-1, a tension servo oil cylinder 13-2, a pull rod 13-3, a slide rail 13-4, an impact load brake 13-5, a load transmission shaft 13-6 and an eddy current brake 13-7; the tension servo oil cylinder 13-2 is connected with the load base 13-1, the tension servo oil cylinder 13-2 is connected with the pull rod 13-3 through a pin shaft, the pull rod 13-3 is connected with the impact load brake 13-5 through a pin shaft, and the impact load brake 13-5 is matched with the slide rail 13-4 through a chute structure, so that the impact load brake 13-5 is driven by the tension servo oil cylinder 13-2 to act, and the load transmission shaft 13-6 is tightly held to generate braking impact load; the eddy current brake 13-7 is connected to the load base 13-1 and to the load transmission shaft 13-6 to generate a controllable steady-state torque load.
The radial constraint system consists of more than three radial constraint devices 9 and is used for constraining the bending half-wave, the revolution radius and the radial displacement of the test drill rod 15 to carry out the test; the radial constraint device 9 consists of a radial constraint base 9-1, a sliding shaft 9-2, a position sensor 9-3, a drill rod constraint base 9-4, a sliding sleeve 9-5, an oil seal ring 9-6, a third end cover 9-7, a thrust sleeve 9-8, a force transmission shaft 9-9, a third thrust bearing 9-10, a radial limit ring 9-11 and a servo oil cylinder 9-12; the sliding shaft 9-2 is connected with the radial constraint base 9-1, the sliding sleeve 9-5, the oil seal ring 9-6 and the third end cover 9-7 are sequentially connected and matched with the sliding shaft 9-2 and the drill rod constraint base 9-4 to form a sliding structure and a lubricating seal cavity; the force transmission shaft 9-9 is matched with a third thrust bearing 9-10 and is arranged on the drill rod restraint base 9-4, and a radial limiting ring 9-11 is arranged in a cavity of the force transmission shaft 9-9 and is fixed by two ends of a thrust sleeve 9-8; the contact side of the inner wall of the radial limiting ring 9-11 and the test drill rod 15 has a certain radian, and the radian is set according to the bending constraint condition of the test drill rod 15; the radial restraint device 9 is configured with radial limiting rings 9-11 with different diameters according to the combination of the diameter of a drill hole and the diameter of a drill rod, and the radial restraint device 9 forms restraint on radial displacement and radial load of a test drill rod 15 and simulates radial displacement restraint, half-wave restraint and revolution restraint on the drill rod in loading construction; the position sensor 9-3 detects the position of the radial limiting ring 9-11, and the radial displacement loaded by the servo oil cylinder 9-12 is controlled in a feedback mode.
The axial force loading system 7 is connected with the torque loading system, controllable propelling force is output by the large-propelling-force double-oil-cylinder device and the force-bearing slide rail, steady-state or dynamic propelling force is output in a simulation mode according to the propelling cutting resistance, the sliding friction resistance and the drilling constraint transient impact and the periodic variable load, the output propelling force is detected by the propelling force measuring device, and the loading of the propelling force is controlled in a feedback mode.
The experimental device comprises the following specific operation steps:
1) according to the parameters of the test drill rod 15 and the drilling diameter parameters, three or more radial constraint devices 9 are arranged, the constraint distance of the test drill rod 15 is equal to half wavelength generated by matching the test drill rod 15 with the test parameters or the constraint length of the tested drill hole on the drill rod, radial constraint is loaded on the test drill rod 15, and the loaded radial constraint displacement is controlled through feedback of the position sensor 9-3.
2) A test drill rod 15 is arranged on a torque loading device 8 and a torque loading device 10 and is clamped and fixed by a first clamping device 8-1 and a second clamping device 10-1 respectively, the test drill rod 15 penetrates through a radial limiting ring 9-11 of a radial restraining device 9, the axis of the test drill rod 15 is coaxial with the axis of the radial limiting ring 9-11, and a pressurizing water path 5 and a water path loading system 16 are arranged on two sides of the test drill rod 15 respectively to form an internal power water pressurizing loop.
3) The loading motor 1 loads driving force and controls the loading of rotating speed, and the torque force and the rotating speed are transmitted to the test drill rod 15 through the loading connecting device 2, the automatic transmission 3, the loading speed reducer 4 and the torque loading device 8 in sequence.
4) The load device 13 generates steady-state counter torque, alternating counter torque load or transient impact load, and the steady-state counter torque, the alternating counter torque load or the transient impact load is transmitted to the test drill rod 15 through the load speed reducer 12, the torque and rotation speed detector 11 and the torque load device 10.
5) The water pressure required by the loading test is loaded by the loading water pump 6 and is transmitted to the test drill rod 15 through the pressurized waterway 5, and the flow rate and the impact of the water pressure are regulated by the waterway load system 16.
6) Through the steps 1), 2), 3), 4), 5) loading the constraint and load of the test drill rod 15, the test drill rod 15 can be individually loaded one by one, and the load can also be simultaneously applied to the test drill rod 15 so as to simulate the load of the drill rod under the condition of multiple loads and constraint combination, form the capabilities of loading torque, propelling force, radial displacement constraint and dynamic radial force of a drill hole to the drill rod, dynamic counter torque of the drill rod at the bottom of the hole for cutting rocks and dynamic hydraulic pressure load, realize the controllable and dynamic loading of the multiple loads and constraint combination, and simulate the comprehensive performance of the drill rod under the working conditions of drilling construction load, alternating load, drill rod vortex, drill rod vibration and resonance, revolution, autorotation centrifugal force and the like.
The invention provides an accurate and reliable test method and an experimental device for a drill rod for coal mine drilling, which can test drill rods with various diameter models and various stress and motion models, can simulate the constraint and stress of the drill rod under various working conditions, and load a controllable composite load on the drill rod, wherein the composite load comprises torque, propulsive force, radial displacement constraint and dynamic radial force of a drill hole on the drill rod, dynamic counter torque of the drill rod at the bottom of a hole on rock cutting, and dynamic hydraulic load, and can test the comprehensive performance of the drill rod under the stable and dynamic loads and the comprehensive performance of the drill rod under the working conditions of whirling, vibration, revolution, autorotation, centrifugal force and the like.
The device can simulate the steady state and dynamic load of the drill rod and simulate the movement of various working conditions of the drill rod through the test device according to the stress and constraint working conditions of the drill rod for the coal mine, and overcomes the defects that the conventional drill rod test device can only load a single load or a static load and cannot simulate a comprehensive stress model and a dynamic load model of the drill rod; by loading controllable composite load and constraint on the test drill rod 15, the fatigue life of the drill rod, the stability of the drill rod under the composite load, the sealing performance of the drill rod under the composite load, the strength of the drill rod under various stress and motion conditions and other comprehensive performances are tested.
The invention is suitable for the fatigue life of the drill rod for coal mines, the stability of the drill rod under the comprehensive load, the sealing performance of the drill rod under the comprehensive load, the strength of the drill rod under various stress and motion conditions and other comprehensive performance tests.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (8)
1. A dynamic comprehensive performance test method for a coal mine drill rod is characterized by comprising the following steps: the method comprises the following steps that a torque loading system for simulating the stress state of a power end of a drill rod and a load system for simulating the stress state of a drilling end of the drill rod are respectively arranged at two ends of a test drill rod, an axial force loading system for loading a controllable axial load on the test drill rod, a radial constraint system for simulating radial displacement constraint and radial force loading of the drill rod in loading construction and a waterway loading system for loading high-pressure or ultrahigh-pressure water pressure with certain pressure on the test drill rod are arranged; the load of the test drill rod is controllably and compositely dynamically loaded through a torque loading system, an axial force loading system, a radial constraint system, a load system and a waterway loading system, and the comprehensive performance of the drill rod under the working conditions of drilling construction steady state and dynamic load, drill rod whirling, drill rod vibration and resonance, revolution and autorotation centrifugal force is simulated;
the torque loading system comprises: the loading motor is connected with the automatic transmission through a loading transmission shaft and is arranged on the loading connecting device, the automatic transmission is connected with the loading speed reducer through a torque transmission device, the loading speed reducer is connected with the torque loading device through the torque transmission device, and the torque loading device is connected with the test drill rod;
a load system: the device comprises a torque load device, a torque rotating speed detection device, a load speed reduction device and a load device, wherein the load device comprises a load base, a tension servo oil cylinder, a pull rod, a slide rail, an impact load brake, a load transmission shaft and an eddy current brake; the tension servo oil cylinder is connected with the load base, the tension servo oil cylinder is connected with the pull rod through a pin shaft, the pull rod is connected with the impact load brake through a pin shaft, and the impact load brake is matched with the slide rail through a chute structure, so that the tension servo oil cylinder drives the impact load brake to act, and the load transmission shaft is tightly held to generate braking impact load; the eddy current brake is connected with the load base and is connected with the load transmission shaft to generate a controllable steady-state torque load; the load device is connected with the load reduction device through a load transmission shaft, the load reduction device is connected with the torque and rotation speed detection device through the torque transmission device, the torque and rotation speed detection device is connected with the torque load device through the torque transmission device, and the torque load device is connected with the test drill rod.
2. The dynamic comprehensive performance test method for the coal mine drill rod according to claim 1, characterized by comprising the following steps: the composite and controllable simulated composite load applied to the test drill rod simultaneously comprises torque, propelling force, radial displacement constraint and dynamic radial force of the drill rod by drilling, dynamic counter torque of rock cutting of the drill rod at the bottom of the hole and dynamic hydraulic load, so that controllable and dynamic loading of multiple load and constraint combination is realized.
3. The dynamic comprehensive performance test method of the coal mine drill rod according to claim 1, characterized by comprising the following steps: the radial constraint system constrains the bending half-wave, the revolution radius and the radial displacement of the test drill rod so as to simulate the half-wave constraint, the revolution constraint and the radial displacement constraint of the drill rod in loading construction.
4. The dynamic comprehensive performance test method for the coal mine drill rod according to claim 1, characterized by comprising the following steps: the radial restraint system comprises more than 3 radial restraint devices, the radial limit of the radial restraint devices on the test drill rod is configured according to the combination of the drill hole diameter and the drill rod diameter, and the restraint distance of the radial restraint devices on the test drill rod is equal to the half wavelength generated by matching the test drill rod with the experiment parameters or the restraint length of the test drill hole on the drill rod.
5. The dynamic comprehensive performance test method of the coal mine drill rod according to claim 1, characterized by comprising the following steps: the axial force loading system simulates and outputs a steady-state or dynamic propelling force according to the propelling cutting resistance, the sliding friction resistance, the drilling constraint transient impact and the periodic variable load, the output thrust is detected through the thrust measuring device, and the loading of the propelling force is controlled in a feedback mode.
6. The dynamic comprehensive performance test method of the coal mine drill rod according to claim 1, characterized by comprising the following steps: the waterway loading system consists of a pressurized waterway, a loading water pump and a waterway loading system, the water pressure required by the loading water pump loading test is transmitted to the test drill rod through the pressurized waterway, and the flow and the impact of the water pressure are adjusted by the waterway loading system.
7. The dynamic comprehensive performance test method of the coal mine drill rod according to claim 1, characterized by comprising the following steps: the load system simulates and outputs steady-state torque, dynamic variable load torque, impact torque and periodic impact torque according to cutting reaction torque in a drill hole, rotation and sliding transient friction resistance and periodic and instantaneous impact load generated by radial constraint of the drill pipe by the drill hole, and realizes feedback control on the torque loading system and the load system by detecting the torque and the rotating speed of the test drill pipe.
8. The utility model provides a drilling rod dynamic comprehensive properties test device for coal mine which characterized in that: the device comprises a torque loading system and a load system which are respectively arranged at two ends of a test drill rod, wherein the torque loading system comprises a variable-speed driving device and a torque loading device connected with the variable-speed driving device; the load system comprises a torque load device, a torque rotating speed detection device, a load speed reduction device and a load device; the load device comprises a load base, a tension servo oil cylinder, a pull rod, a slide rail, an impact load brake, a load transmission shaft and an eddy current brake; the tension servo oil cylinder is connected with the load base, the tension servo oil cylinder is connected with the pull rod through a pin shaft, the pull rod is connected with the impact load brake through a pin shaft, and the impact load brake is matched with the slide rail through a chute structure, so that the tension servo oil cylinder drives the impact load brake to act, and the load transmission shaft is tightly held to generate braking impact load; the eddy current brake is connected with the load base and is connected with the load transmission shaft to generate controllable steady-state torque load; the load device is connected with the load speed reducer through a load transmission shaft, the load speed reducer is connected with the torque and rotating speed detection device through a torque transmission device, the torque and rotating speed detection device is connected with the torque load device through the torque transmission device, and the torque load device is connected with the test drill rod; the device also comprises an axial force loading system arranged at one end of the test drill rod to realize loading of controllable axial load on the test drill rod, a radial constraint system used for simulating radial displacement constraint and radial force loading of the drill rod in loading construction, and a high-pressure or ultrahigh-pressure water path loading system used for loading a certain pressure on the test drill rod.
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| CN115096573B (en) * | 2022-06-30 | 2023-12-22 | 中国地质大学（北京） | Test Equipment |
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