CN113899634B - Device and method for evaluating rock breaking efficiency of drill bit teeth under impact load effect - Google Patents
Device and method for evaluating rock breaking efficiency of drill bit teeth under impact load effect Download PDFInfo
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- CN113899634B CN113899634B CN202110992590.0A CN202110992590A CN113899634B CN 113899634 B CN113899634 B CN 113899634B CN 202110992590 A CN202110992590 A CN 202110992590A CN 113899634 B CN113899634 B CN 113899634B
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- 239000011435 rock Substances 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000000694 effects Effects 0.000 title claims description 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 230000006835 compression Effects 0.000 claims abstract description 8
- 238000007906 compression Methods 0.000 claims abstract description 8
- 230000006378 damage Effects 0.000 claims abstract description 6
- 238000010521 absorption reaction Methods 0.000 claims abstract description 5
- 239000003921 oil Substances 0.000 claims description 36
- 238000005265 energy consumption Methods 0.000 claims description 13
- 239000010720 hydraulic oil Substances 0.000 claims description 9
- 239000010705 motor oil Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 238000005553 drilling Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
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- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/307—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated by a compressed or tensile-stressed spring; generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0037—Generation of the force using mechanical means involving a rotating movement, e.g. gearing, cam, eccentric, or centrifuge effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The invention discloses a device and a method for evaluating rock breaking efficiency of drill teeth under impact load action. The rock breaking system consists of a Hopkinson pressure bar device, a drill bit and a sleeve, wherein the Hopkinson pressure bar device mainly comprises a transmitting tube, an impact bar, a laser velocimeter, an incident bar, a transmission bar and an absorption bar. The triaxial loading system consists of an axial compression cylinder, a confining pressure cylinder, a baffle, a screw rod, a connecting rod and other devices. The data acquisition and processing system is composed of a high-speed camera, a strain sensor, a dynamic strain gauge connected with the strain sensor, a data acquisition device connected with the dynamic strain gauge and a computer connected with the data acquisition device. The invention ensures that the test result is more reliable and accurate, can capture the deformation and damage process of the rock sample in the experimental process by the high-speed camera, and has wide application prospect.
Description
Technical Field
The invention relates to the field of resource exploitation and drilling test devices, in particular to a device and a method for evaluating rock breaking efficiency of drill bit teeth under impact load.
Background
As shallow mineral resources are continuously exhausted, resource and energy exploitation gradually turns to deep development, and future deep exploitation becomes normalized. However, after deep mining, the rock mass is subjected to very complex environments, and the deep in-situ rock mass is subjected to high-amplitude three-dimensional stress and strong engineering disturbance. In addition, resource and energy exploitation relates to a very important link of drilling operation, and in different rock strata, rock breaking efficiency research is one of important basic theoretical research directions of drilling profession, and is always in the exploration and test stage until now.
In order to improve the rock breaking efficiency of the drill bit and achieve the aim of reducing the cost, the drill bit suitable for the stratum characteristics must be designed and selected for different drilling strata. At present, the main methods for researching the rock breaking efficiency of the drill bit at home and abroad comprise field tests and indoor tests, wherein the field tests are the field application of the drill bit designed for different stratum, and then the design is modified and reprocessed, so that the period required by developing the drill bit with the characteristics is long, and the cost is high; the indoor test method is complex in operation and low in automation degree. With the increase of geothermal drilling depth and the complicating of stratum rock, the research work of designing and developing characteristic drill bit according to the characteristics of different stratum rock is more urgent, and the importance of a simple and convenient drill bit tooth rock breaking efficiency test is more prominent.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provide a device and an evaluation method for the tooth rock breaking efficiency of a mechanical rock breaking test drill bit under the action of impact load.
The technical scheme of the invention is as follows: a test method for evaluating rock breaking efficiency of drill bit teeth under impact load mainly comprises a rock breaking system, a triaxial loading system and a data acquisition and processing system.
The rock breaking system consists of a Hopkinson pressure bar device, a drill bit and a sleeve, wherein the Hopkinson pressure bar device mainly comprises a transmitting tube, an impact bar, a laser velocimeter, an incident bar, a transmission bar and an absorption bar. The drill bit is connected to the right end of the incidence rod through a sleeve. The striking rod is pushed by high-pressure gas to be ejected from the transmitting tube at a certain speed (measured by a laser velocimeter) to strike the striking rod, so that the drill bit is pushed to cut a rock sample.
The triaxial loading system consists of an axial compression cylinder, a confining pressure cylinder, a baffle, a screw rod, a connecting rod and other devices. The confining pressure cylinder and the shaft pressure cylinder are hollow cylinders, two ends of the cylinder are plugged by a baffle, a round hole for an incident rod or a transmission rod to pass through is formed in the center of the baffle, small round holes are formed in the periphery of the baffle, and a screw rod connects the cylinder and the baffles on two sides into an integral structure by penetrating the small round holes in the periphery through bolts. Two connecting rods are further connected between the baffles of the two cylinders through screws so as to restrict the relative movement of the two cylinders.
The lower part and the upper part of the central large round hole of the right baffle of the confining pressure cylinder are respectively provided with an oil inlet and an exhaust outlet, the outer side of the exhaust outlet is provided with an exhaust outlet sealing plug for sealing the cylinder after the air in the cylinder is exhausted, and the confining pressure cylinder and the shaft pressure cylinder are connected with the same engine oil pressure device through oil pipes, so that the stability of shaft pressure and confining pressure is ensured. The oil inlet is used for pumping hydraulic oil into the cylinder to apply annular static confining pressure and axial pressure to the rock sample wrapped in the anti-seepage rubber sleeve, and the static confining pressure and the axial pressure are displayed through a confining pressure oil gauge arranged on the upper part of a right baffle of the confining pressure cylinder.
The data acquisition and processing system is composed of a high-speed camera, a strain sensor, a dynamic strain gauge connected with the strain sensor, a data acquisition device connected with the dynamic strain gauge and a computer connected with the data acquisition device. The strain sensor is stuck to the middle parts of the incident rod and the transmission rod, the measured signals are converted by the bridge and then transmitted to the data acquisition device by the dynamic strain gauge, and finally the data acquisition device is input into the computer for analysis and processing.
A test method for evaluating rock breaking efficiency of drill bit teeth under impact load action comprises the following steps:
(1) And selecting a cylindrical rock sample with the diameter equal to that of the incident rod and the transmission rod, inserting the rock sample into the confining pressure cylinder, adjusting the incident rod and the transmission rod, and clamping the rock sample.
(2) Opening the exhaust port and the oil inlet, starting to pressurize by the engine oil pressure device to enable hydraulic oil to enter the cylinder, gradually increasing the oil quantity, slowly discharging gas in the cylinder, continuing to pressurize by oil inlet until the confining pressure required by the experiment is reached, and closing the oil inlet to enable the test piece to be in the required confining pressure and shaft pressure state.
(3) And setting a fixed air pressure, pushing the striking rod through the high-pressure air, and injecting the air from the transmitting tube at a certain speed, wherein the speed is measured by the laser velocimeter, and the striking rod strikes the incident rod, so that the drill bit is pushed to cut the sample.
(4) The incident, reflected and transmitted strain signals were tested by strain sensors attached to the incident and transmitted rods.
(5) And (3) the signals measured in the step (4) are converted by an electric bridge and then transmitted into a data acquisition device by a dynamic strain gauge.
(6) And inputting the signals transmitted into the data acquisition device into a computer for analysis and processing.
(7) Calculating a crushing energy consumption density formula of influence of bit pressing in on rock crushing efficiency under the impact effect:
A, E, C are cross sectional areas of the compression bars and mm respectively; elastic modulus, GPa; and longitudinal wave velocity, m/s; a S and V are the cross-sectional areas of the rock sample, mm respectively; the volumes of the rock samples, mm 3;εI、εR、εT, are incident, reflected and transmitted strain, respectively.
(8) The data acquisition and processing system brings the obtained real-time data into a programmed dynamic crushing energy consumption density formula, and the energy consumed by the rock per unit volume of the drill bit cuttings reflects the rock crushing efficiency of the drill bit. Therefore, the larger the crushing energy consumption density is, the lower the rock breaking efficiency is, the poorer the adaptability of the drill bit and the stratum is, and the drill bit parameters are required to be optimized.
(9) The whole deformation and destruction process of the rock sample is captured by a high-speed camera and the broken pieces after impact crushing are collected.
(10) And opening the oil inlet, and recovering the hydraulic oil through an engine oil pressure device.
(11) Replacing another type of drill bit, and repeating the steps (1) - (11).
(12) The crushing energy consumption density and the crushing degree of the rock samples of different types of drill bits are compared, and the drill bit is preferred.
The invention has the following beneficial effects:
1. the invention enables the testing process to be more similar to the real triaxial stress environment of the deep rock mass, and can maintain the relative stability of confining pressure and axial pressure, thereby enabling the testing result to be more reliable and accurate.
2. The invention provides a method for evaluating the tooth rock breaking efficiency of a drill bit, which can be used for measuring the mechanical specific energy relation between the drill bit and a rock sample in real time and evaluating the rock breaking efficiency of different rock samples and drill bits, thereby providing a method for optimizing the type of the drill bit.
3. The method has the advantages of short testing process time, high automation degree, simple operation and wide expansion function, and can capture the deformation and damage process of the rock sample in the experimental process by the high-speed camera, thereby having wide application prospect.
Drawings
Fig. 1 is a top view of an assembled overall view of the present invention.
FIG. 2 is a three-dimensional view of a triaxial loading system according to the present invention.
FIG. 3 is a three-dimensional view of the confining pressure loading device of the invention.
Fig. 4 is a flow chart of the method of the present invention.
In the figure: 1. a transmitting tube; 2. a striker rod; 3. a laser velocimeter; 4. an incident rod; 5. a sleeve; 6. a drill bit; 7. a transmission rod; 8. an absorption rod; 9. a confining pressure cylinder; 10. a left baffle of the surrounding air bar; 11. a right baffle of the surrounding air bar; 12. an axial compression cylinder; 13. a left baffle of the shaft air bar; 14. a right baffle of the shaft air pressing bar; 15. a screw; 16. a connecting rod; 17. an oil inlet; 18. an exhaust port sealing plug; 19. an exhaust port; 20. an oil meter; 21. an oil pipe; 22. an oil pressure device; 23. a rock sample; 24. a strain sensor; 25. a dynamic strain gauge; 26. a data collector; 27. a computer; 28 high speed camera; 29. a central large round hole; 30. an anti-penetration rubber sleeve.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
As shown in FIG. 1, the present invention relates to a device and method for evaluating the rock breaking efficiency of drill teeth under impact load. The device comprises a rock breaking system, a triaxial loading system and a data acquisition and processing system. The rock breaking system is used for applying dynamic load to push the drill bit to break the rock sample; the triaxial loading system is used for applying required confining pressure and axial pressure to the rock sample, so that triaxial comprehensive loading of the rock sample is simulated, and the testing process is more similar to the real triaxial stress environment of the deep rock mass; the data acquisition and processing system is used for capturing incident, reflected and transmitted signals on the compression bar and obtaining the change relation between the intensity and crushing energy consumption density and the drill bit.
The rock breaking system consists of a Hopkinson pressure bar device, a drill bit 6 and a sleeve 5, wherein the Hopkinson pressure bar device mainly comprises a transmitting tube 1, an impact bar 2, a laser velocimeter 3, an incident bar 4, a transmission bar 7 and an absorption bar 8. The drill bit 6 is connected to the end part of the incident rod 4 of the Hopkinson pressure bar device through a sleeve 5. The striking rod 2 is pushed by high-pressure gas to be ejected from the transmitting tube 1 at a certain speed (measured by the laser velocimeter 3) to strike the incident rod 4, thereby pushing the drill bit 6 to cut the rock sample.
The triaxial loading system comprises a confining pressure cylinder 9, a confining pressure cylinder left baffle 10, a confining pressure cylinder right baffle 11, a shaft pressure cylinder 12, a shaft pressure cylinder left baffle 13, a shaft pressure cylinder right baffle 14, a screw 15, a connecting rod 16, an oil inlet 17, an oil outlet 18, an exhaust port 19 and an oil meter 20. The confining pressure cylinder 9 and the shaft pressure cylinder 12 are hollow cylinders, the cylinder is used for forming a sealed oil storage space, two ends of the confining pressure cylinder are blocked by a confining pressure cylinder left baffle 10 and a confining pressure cylinder right baffle 11, two ends of the shaft pressure cylinder are blocked by a shaft pressure cylinder left baffle 13 and a shaft pressure cylinder right baffle 14, a central large round hole 29 for an incident rod 4 or a transmission rod 7 to pass through is formed in the center of each of the four baffles, and the diameter of the round hole is slightly larger than that of the incident rod or the transmission rod so as not to prevent the incident rod or the transmission rod from horizontal movement. The baffle is also provided with small round holes on the periphery, and the screw 15 connects the air cylinder and the baffles on the two sides into an integral structure by penetrating the small round holes on the periphery through bolts. The confining pressure cylinder left baffle 10 and the shaft pressure cylinder right baffle 14 are also connected with two connecting rods 16 through screws so as to restrain the relative movement of the two cylinders.
The lower part of a central large round hole 29 of the right baffle plate 11 of the confining pressure cylinder is provided with an oil inlet 17, the upper part of the central large round hole is provided with an exhaust port 19, the outer side of the exhaust port 19 is provided with an exhaust port sealing plug 18 for sealing the cylinder after the air in the cylinder is exhausted, and the confining pressure cylinder 9 and the axial pressure cylinder 12 are connected with the same engine oil pressure device 22 through an oil pipe 21, so that the stability of axial pressure and confining pressure is ensured. The oil inlet 17 is used for pumping hydraulic oil into the cylinder to apply annular static confining pressure and axial pressure to the rock sample 23 wrapped in the impermeable rubber sleeve 30, and the static confining pressure and the axial pressure are displayed through a confining pressure oil gauge 20 arranged on the upper part of a right baffle of the confining pressure cylinder.
The data acquisition and processing system is composed of a high-speed camera 28, a strain sensor 24, a dynamic strain gauge 25 connected with the strain sensor 24, a data acquisition device 26 connected with the dynamic strain gauge 25, and a computer 27 connected with the data acquisition device 26. The high speed camera 28 may capture the deformation and destruction process of the rock sample 23 to be tested. The strain sensor 24 is adhered to the middle parts of the incident rod 4 and the transmission rod 7, the measured signals are converted by an electric bridge, and then transmitted to the data collector 26 through the dynamic strain gauge 25, and finally input to the computer 27 for analysis and processing.
The device and the method for evaluating the rock breaking efficiency of the drill bit teeth under the impact load effect comprise the following specific steps:
(1) And selecting a cylindrical rock sample 23 with the diameter equal to that of the incident rod 4 and the transmission rod 7, placing the rock sample 23 into the confining pressure cylinder 9, and adjusting the incident rod 4 and the transmission rod 7 to clamp the rock sample 23.
(2) Opening the exhaust port 19 and the oil inlet 17, starting to pressurize by the engine oil pressure device 22 to enable hydraulic oil to enter the confining pressure cylinder 9 and the shaft pressure cylinder 12, gradually increasing the oil quantity, slowly discharging gas in the cylinder body, continuing to pressurize by oil inlet until confining pressure required by experiments is reached, closing the oil inlet 17, and enabling the rock sample 23 to be in a required confining pressure and shaft pressure state.
(3) A fixed air pressure is set, a Hopkinson bar system is started, the impact bar 2 is pushed by high-pressure air, the impact bar is ejected from the transmitting tube 1 at a certain speed, the speed is measured by the laser velocimeter 3, the impact bar 2 impacts the incidence bar 4, and the drill bit 6 is pushed to compress the rock sample 23.
(4) The incident, reflected and transmitted strain signals were tested by strain sensors 24 attached to the incident beam 4 and the transmission beam 7.
(5) The signals measured in the step (3) are converted by an electric bridge and then transmitted into the data collector 13 through the dynamic strain gauge 25.
(6) The signals incoming to the data collector 26 are input to a computer 27 for analysis.
(7) Calculating a crushing energy consumption density formula of influence of bit pressing in on rock crushing efficiency under the impact effect:
A, E, C are cross sectional areas of the compression bars and mm respectively; elastic modulus, GPa; and longitudinal wave velocity, m/s; a S and V are the cross-sectional areas of the rock sample, mm respectively; the volumes of the rock samples, mm 3;εI、εR、εT, are incident, reflected and transmitted strain, respectively.
(8) The data acquisition and processing system brings the obtained real-time data into a programmed dynamic crushing energy consumption density formula, and the energy consumed by the rock per unit volume of the drill bit cuttings reflects the rock crushing efficiency of the drill bit. Therefore, the larger the crushing energy consumption density is, the lower the rock breaking efficiency is, the poorer the adaptability of the drill bit and the stratum is, and the drill bit parameters are required to be optimized.
(9) The entire deformation and destruction process of the rock sample 23 is captured by the high speed camera 28 and the fragments after impact crushing are collected.
(10) The oil inlet 17 is opened and the hydraulic oil is recovered by the oil pressure device 22.
(11) Replacing another type of drill bit, and repeating the steps (1) - (11).
(12) The crushing energy consumption density and the crushing degree of the rock samples of different types of drill bits are compared, and the drill bit is preferred.
Claims (2)
1. A test method for evaluating rock breaking efficiency of drill bit teeth under impact load is characterized by comprising the following steps: the device for realizing the method comprises a rock breaking system, a triaxial loading system and a data acquisition and processing system;
The rock breaking system consists of a Hopkinson pressure bar device, a drill bit and a sleeve; the Hopkinson pressure bar device mainly comprises a transmitting tube, an impact bar, a laser velocimeter, an incident bar, a transmission bar and an absorption bar; the drill bit is connected to the end part of an incident rod of the Hopkinson pressure bar device through a sleeve; the striking rod is pushed by high-pressure gas, and is ejected from the transmitting pipe at a certain speed and strikes the incident rod, so that the drill bit is pushed to cut a rock sample;
The triaxial loading system consists of an axial compression cylinder, a confining pressure cylinder, a baffle, a screw rod and a connecting rod; the confining pressure cylinder and the shaft pressure cylinder are hollow cylinders, two ends of the cylinder are plugged by a baffle, a round hole for an incident rod or a transmission rod to pass through is formed in the center of the baffle, small round holes are formed in the periphery of the baffle, and a screw rod connects the cylinder and the baffles on two sides into an integral structure by penetrating the small round holes in the periphery through bolts; two connecting rods are also connected between the baffles of the two cylinders through screws so as to restrict the relative movement of the two cylinders;
The lower part and the upper part of the central large round hole of the right baffle of the confining pressure cylinder are respectively provided with an oil inlet and an exhaust outlet, the outer side of the exhaust outlet is provided with an exhaust outlet sealing plug for sealing the cylinder after the air in the cylinder is exhausted, and the confining pressure cylinder and the shaft pressure cylinder are connected with the same engine oil pressure device through oil pipes, so that the stability of the shaft pressure and the confining pressure is ensured; the oil inlet is used for pumping hydraulic oil into the cylinder to apply annular static confining pressure and axial pressure to the rock sample wrapped in the anti-seepage rubber sleeve, and the static confining pressure and the axial pressure are displayed through a confining pressure oil gauge arranged on the upper part of a right baffle of the confining pressure cylinder;
the test method for evaluating the rock breaking efficiency of the drill bit teeth under the impact load effect comprises the following steps:
(1) Selecting a cylindrical rock sample with the diameter equal to that of the incident rod and the transmission rod, inserting the rock sample into the confining pressure cylinder, adjusting the incident rod and the transmission rod, and clamping the rock sample;
(2) Opening an exhaust port and an oil inlet, starting to pressurize by an engine oil pressure device to enable hydraulic oil to enter a cylinder, gradually increasing oil quantity, slowly discharging gas in the cylinder, continuing to pressurize by oil inlet until the confining pressure required by an experiment is reached, and closing the oil inlet to enable a test piece to be in a required confining pressure and shaft pressure state;
(3) Setting a fixed air pressure, pushing an impact rod through high-pressure air, injecting the air from the transmitting tube at a certain speed, wherein the speed is measured by a laser velocimeter, and the impact rod impacts the incident rod, so that a drill bit is pushed to cut a sample;
(4) The incident, reflection and transmission strain signals are obtained through the test of strain sensors stuck on the incident rod and the transmission rod;
(5) The signals measured in the step (4) are converted by an electric bridge and then transmitted into a data acquisition device by a dynamic strain gauge;
(6) Inputting the signals transmitted into the data acquisition device into a computer for analysis and processing;
(7) Calculating a crushing energy consumption density formula of influence of bit pressing in on rock crushing efficiency under the impact effect:
a, E, C are cross sectional areas of the compression bars and mm respectively; elastic modulus, GPa; and longitudinal wave velocity, m/s; a S and V are the cross-sectional areas of the rock sample, mm respectively; the volume of the rock sample, mm 3;εI、εR、εT is the incident strain, the reflection strain and the transmission strain respectively;
(8) The data acquisition and processing system brings the obtained real-time data into a programmed dynamic crushing energy consumption density formula, and the energy consumed by the drill bit for cutting the rock per unit volume reflects the rock breaking efficiency of the drill bit; the larger the crushing energy consumption density is, the lower the rock breaking efficiency is, the poorer the adaptability of the drill bit and the stratum is, the drill bit parameters are required to be optimized, and a dynamic drilling efficiency evaluation method is provided for mechanical rock breaking;
(9) Capturing the whole deformation and destruction process of the rock sample by a high-speed camera, and collecting fragments after impact crushing;
(10) Opening an oil inlet, and recovering hydraulic oil through an engine oil pressure device;
(11) Replacing another type of drill bit, and repeating the steps (1) - (11);
(12) The crushing energy consumption densities and the crushing degrees of the rock samples of the different types of drill bits are compared.
2. A device for evaluating the rock breaking efficiency of a drill bit tooth under impact loading as recited in claim 1, wherein: the data acquisition and processing system consists of a high-speed camera, a strain sensor, a dynamic strain gauge connected with the strain sensor, a data acquisition device connected with the dynamic strain gauge and a computer connected with the data acquisition device; the strain sensor is stuck to the middle parts of the incident rod and the transmission rod, the measured signals are converted by the bridge and then transmitted to the data acquisition unit by the dynamic strain gauge, and finally the data acquisition unit is input to the computer for analysis.
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