CN115356142B - Hydraulic rock drill performance detection system and method - Google Patents
Hydraulic rock drill performance detection system and method Download PDFInfo
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- CN115356142B CN115356142B CN202211290620.4A CN202211290620A CN115356142B CN 115356142 B CN115356142 B CN 115356142B CN 202211290620 A CN202211290620 A CN 202211290620A CN 115356142 B CN115356142 B CN 115356142B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a hydraulic rock drill performance detection system and method, and relates to the technical field of rock drills. The hydraulic rock drill is connected with the impacted hydraulic cylinder through a drill bit tail connecting sleeve and is connected with a hydraulic pump system; the pressure sensor is used for acquiring pressure signals in real time; the displacement sensor is used for acquiring a displacement signal of the hydraulic rock drill in real time; the flow sensor is used for acquiring flow signals in real time; the collected pressure, displacement and flow signals are transmitted to a computer through a data acquisition system in real time, the displacement, pressure and flow signals are analyzed in real time, impact performance parameters are accurately obtained, the motion state of an impact piston of the hydraulic rock drill is monitored, the impact state of an impact point of the hydraulic rock drill at the moment is determined, and a corresponding matched impact point state judgment method is provided. The system and the method are simple and reliable, low in cost, high in accuracy and repeatability, and provide reliable basis for analyzing the performance of the rock drill.
Description
Technical Field
The invention relates to the technical field of rock drills, in particular to a hydraulic rock drill performance detection system and method.
Background
The impact performance of the hydraulic rock drill is the most important performance, the accurate and reliable measuring method has important significance for optimizing the impact performance, the impact point of the rock drill is found and analyzed, whether the impact state is the optimal impact state or not is judged, the research on the impact characteristic and the internal element motion of the hydraulic rock drill is facilitated, and the manufacturing level of the hydraulic rock drill is improved.
The existing method for testing the impact performance of the hydraulic rock drill mostly adopts a direct rock impact mode, the impact performance of the rock drill is roughly evaluated by recording the time for impacting a hole with a certain length, but the performance parameters of the rock drill cannot be accurately obtained, the problems of high cost, complex operation, low repeatability and great influence of human factors exist, the test result cannot objectively reflect the actual impact performance parameters of the hydraulic rock drill, the position of the impact point cannot be analyzed and judged, and the method has low significance for equipment optimization guidance. Chinese patent CN107543734A discloses a rock drill impact performance test scheme with drop hammer calibration, which relies on a weight as a load to absorb the impact energy of the rock drill and relies on a drop hammer method to perform parameter calibration to realize the test of impact performance parameters. However, the method measures the impact performance parameters through an indirect method, has relatively poor accuracy and repeatability, cannot accurately judge the state of an impact point, and cannot provide guiding opinions for optimizing the impact performance of equipment.
Disclosure of Invention
The invention provides a hydraulic rock drill performance detection system and method, and the prior art has the following problems that the performance parameters cannot be accurately obtained, the cost is high, the operation is complex, the accuracy and the repeatability are low, and the position of an impact point cannot be analyzed and judged.
To solve the above technical problem, an embodiment of the present invention provides the following solutions:
on one hand, the embodiment of the invention provides a hydraulic rock drill performance detection system, which comprises a hydraulic rock drill and a flushed hydraulic cylinder, wherein the hydraulic rock drill and the flushed hydraulic cylinder are arranged on a rack and are connected through a drill bit tail connecting sleeve;
the pressure sensors are arranged in the front cavity, the rear cavity and the oil inlet of the hydraulic rock drill and are used for acquiring pressure signals in real time;
the flow sensor is arranged on an oil return pipe of the rock drill on the hydraulic pump system and is used for acquiring flow signals in real time;
installing a displacement sensor for acquiring a displacement signal of the hydraulic rock drill in real time;
transmitting a pressure signal acquired by a pressure sensor, a displacement signal acquired by a displacement sensor and a flow signal acquired by a flow sensor to a computer through a data acquisition system in real time, analyzing the pressure signal, the flow signal and the displacement signal in real time to obtain an impact performance parameter of the hydraulic rock drill and a motion state of an impact piston, analyzing the motion process of the impact piston and determining the impact state of an impact point of the hydraulic rock drill at the moment;
judging whether the rock drill is in an optimal impact state, wherein the displacement of an impact point of the rock drill is characterized by generating violent instantaneous drop and changing the motion direction, and the oil pressure of a rear cavity of the rock drill at the moment of the impact point in the impact state is just switched to judge the rock drill to be in the optimal impact state; when the switching of the oil way of the rear cavity is ahead of the moment of the impact point, the piston braking occurs in the stroke stage, the piston is decelerated before the striking, the striking does not occur at the moment of the maximum kinetic energy of the piston, and the impact point lags behind; on the contrary, when the rear cavity oil way is switched to be later than the moment of the impact point, the piston braking does not occur in the stroke stage, but the stress of the piston is still in the impact motion direction after the impact, the impact does not occur at the moment of the maximum kinetic energy of the piston, and the impact point is advanced.
Preferably, a pressure curve is obtained through a pressure signal, a flow curve is obtained through a flow signal, a displacement curve is obtained through a displacement signal, the pressure curve, the oil return flow curve and the piston displacement curve of the front cavity, the rear cavity and the oil inlet are compared, and the pressure and the flow of the cavity chamber at each position in the movement process of the impact piston of the hydraulic rock drill are monitored;
preferably, calculating the impact performance parameter comprises: differentiating the displacement curve to obtain a speed curve, finding an impact point, obtaining the speed of the impact point, and further calculating the impact energy of the rock drill; carrying out fast Fourier transform on the displacement curve to obtain impact frequency; and obtaining the impact power by calculating the impact energy and the impact frequency.
Preferably, the displacement sensor is a laser displacement sensor.
Preferably, a laser displacement sensor is mounted on the gantry, and a light spot of the laser displacement sensor is struck at the rear end of an impact piston of the hydraulic rock drill.
Preferably, a position adjusting device is installed on the rack, a laser displacement sensor is installed on the position adjusting device, the position adjusting device can adjust the position of the laser displacement sensor, and it is determined that a light spot of the laser displacement sensor is shot on the rear end of an impact piston of the hydraulic rock drilling machine.
Preferably, the drill bit of the hydraulic rock drill is connected with the hydraulic rod of the flushed hydraulic cylinder through a drill bit connecting sleeve.
In one aspect, an embodiment of the present invention provides a method for detecting performance of a hydraulic rock drill, where the method uses the system for detecting performance of a hydraulic rock drill, and the method includes:
installing the hydraulic rock drill to finish impact performance test, and acquiring a pressure signal, a flow signal and a displacement signal in real time;
deriving a nonlinear relation between a voltage signal of the laser displacement sensor and displacement according to a least square method to obtain a displacement curve;
selecting a stable displacement curve and calculating the stroke of the piston;
judging an impact point, determining the impact point by combining displacement data, pressure data and flow data, and judging the position of the impact point;
obtaining a motion speed curve of the piston after differential processing of the displacement curve to obtain the speed of the impact point of the piston;
selecting a section of stable data in the motion speed curve, selecting the speed of an impact point, and calculating impact energy;
carrying out fast Fourier transform on the displacement data to obtain impact frequency;
obtaining impact power according to the impact energy and the impact frequency;
preferably, in the process of judging the impact point, the method comprises the following steps:
where the impact point velocity produces a sharp instantaneous drop and changes the direction of motion.
The scheme of the invention at least comprises the following beneficial effects:
in the scheme, the system and the method are simple and reliable, low in cost, high in accuracy and repeatability, and capable of absorbing impact energy of the rock drill and guaranteeing test operation of equipment; the displacement signal, the pressure signal and the flow signal are used for analyzing the impact characteristics, so that the acquisition of the impact performance parameters of the rock drill is realized, the impact performance of the hydraulic rock drill can be directly tested, and a powerful basis is provided for optimization; the impact state of the impact point can be analyzed and judged to be the best impact state.
Drawings
Fig. 1 is a schematic view of the construction of a hydraulic rock drill performance detection system of the present invention;
FIG. 2 is a velocity profile of the present invention;
FIG. 3 is a graph of acceleration curves for the present invention;
FIG. 4 is a graph of the displacement of the present invention;
FIG. 5 is a graph of frequency curves for the present invention;
FIG. 6 is a schematic diagram of the present invention showing the impact point obtained by the front chamber pressure curve, the back chamber pressure curve, the flow curve, and the displacement curve;
fig. 7 is a flow chart of a hydraulic rock drill performance detection method of the present invention;
fig. 8 is a flow chart of the impact performance test completed by the hydraulic rock drill performance detection system of the present invention.
Reference numerals:
1. a hydraulic rock drill; 2. a charged hydraulic cylinder; 3. a rack; 4. a displacement sensor frame; 5. an oil inlet pressure sensor; 6. a rear cavity pressure sensor; 7. a front cavity pressure sensor; 8. a flow sensor; 9. a displacement sensor; 10. a data acquisition system; 11. a computer; 12. a hydraulic pump system; 13. an oil inlet pipe; 14. an oil return pipe; 15. a manipulator; 16. fixing a nut; 17. a drill shank connecting sleeve; 18. manipulator connecting plate.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Example one
As shown in fig. 1, the embodiment provides a hydraulic rock drill performance detection system, which includes a hydraulic rock drill 1 and a flushed hydraulic cylinder 2 mounted on a gantry 3, where the hydraulic rock drill 1 and the flushed hydraulic cylinder 2 are connected by a shank adapter sleeve 17, and the hydraulic rock drill 1 and the flushed hydraulic cylinder 2 are connected to a hydraulic pump system 12; the flow sensor 8 is arranged on an oil return pipe of the rock drill on the hydraulic pump system 12 and is used for acquiring flow signals in real time; the pressure sensors are arranged in a front cavity, a rear cavity and an oil inlet of the hydraulic rock drill 1 and are used for acquiring pressure signals in real time, and the pressure sensors specifically comprise a front cavity pressure sensor 7 arranged on an oil inlet passage of the front cavity, a rear cavity pressure sensor 6 arranged on an oil inlet passage of the rear cavity and an oil inlet pressure sensor 5 arranged at the oil inlet; the displacement sensor 9 is used for acquiring a displacement signal of the hydraulic rock drill 1 in real time; the pressure sensor, the laser displacement sensor and the flow sensor 8 are connected with a data acquisition system 10, the data acquisition system 10 is connected with a computer 11, pressure signals acquired by the pressure sensor, displacement signals acquired by the displacement sensor 9 and flow signals acquired by the flow sensor 8 are transmitted to the computer 11 through the data acquisition system 10 in real time, the displacement signals, the pressure signals and the flow signals are analyzed in real time, the motion process and the impact performance parameters of the impact piston of the hydraulic rock drill are obtained, the impact state of the impact point of the hydraulic rock drill 1 at the moment is determined, whether the impact state is in the optimal impact state is judged, and reference basis is provided for further optimizing the performance of the hydraulic rock drill 1. The system of the embodiment is simple and reliable, and realizes the impact energy absorption (absorbed by the impacted hydraulic cylinder 2) of the rock drill to ensure the test operation of the equipment; the displacement signal, the pressure signal and the flow signal are used for analyzing the impact characteristics, so that the acquisition of the impact performance parameters of the rock drill is realized, and the impact performance of the hydraulic rock drill 1 can be directly tested; and analyzing to obtain the impact state of the impact point, and judging whether the impact state is the optimal impact state.
And obtaining a pressure curve through the pressure signal, obtaining a displacement curve through the displacement signal, obtaining a flow curve through the flow signal, and comparing the pressure curve, the oil return flow curve and the displacement curve of the front cavity, the rear cavity and the oil inlet to determine the motion state of the impact piston of the hydraulic rock drill.
The method for calculating the impact performance parameters comprises the following steps: differentiating the displacement curve to obtain a speed curve, analyzing a section of stable motion process to obtain the impact end speed of an impact point, and further calculating to obtain impact energy; carrying out fast Fourier transform on the displacement curve to obtain impact frequency; the impact power is obtained by calculating the product of the impact energy and the impact frequency.
The pressure change of the front cavity and the rear cavity in the internal motion process of the impact piston can be directly observed through the pressure sensor, and the pressure of the front cavity, the rear cavity and the inlet of the hydraulic rock drill 1 is measured.
The oil inlet and return flow of the hydraulic rock drill 1 is measured by a flow sensor 8. Rock conditions can be simulated by the hydraulic ram 2.
The hydraulic pump system 12 is communicated with the hydraulic rock drill 1 through an oil inlet pipe 13 and an oil return pipe 14, the hydraulic pump system 12 is communicated with the flushed hydraulic cylinder 2 through the oil inlet pipe 13 and the oil return pipe 14, the hydraulic pump system 12 provides power for the hydraulic rock drill 1 and the flushed hydraulic cylinder 2, and the hydraulic rock drill 1 and the flushed hydraulic cylinder 2 are guaranteed to work effectively.
The drill bit tail of the hydraulic rock drill 1 is connected with the piston rod of the impacted hydraulic cylinder 2 through a drill bit tail connecting sleeve 17, and the drill bit tail is used for transmitting the impact energy of the rock drill to the impacted hydraulic cylinder 2 and ensuring that the impacted hydraulic cylinder 2 absorbs the impact energy of the rock drill.
And a laser displacement sensor is arranged on the rack 3, and a light spot of the laser displacement sensor can be shot at the rear end of an impact piston of the hydraulic rock drill 1. A position adjusting device is installed on the rack 3, a laser displacement sensor is installed on the position adjusting device, the position adjusting device can adjust the position of the laser displacement sensor, and it is determined that a light spot of the laser displacement sensor is shot on the rear end of an impact piston of the hydraulic rock drill 1. Specifically, the position adjusting device can adjust the front and back, up and down, left and right positions of the laser displacement sensor, and light spots are guaranteed to be accurately shot at the rear end of the impact piston. Preferably, the position adjusting device adopts manipulator 15, specifically, manipulator 15 installs on the manipulator brace table, the manipulator brace table is installed on manipulator connecting plate 18, and through two fixation nut 16 location through adjust two fixation nut 16 about the height of position connection manipulator connecting plate 18, and then adjust the height of manipulator 15, through adjusting manipulator joint further adjustment displacement sensor 9 left and right sides and front and back position, manipulator 15 adopts current manipulator, guarantee that piston rear end face is in displacement sensor 9 measuring range all the time in the testing process. And the laser displacement sensor performs accurate measurement on the facula record to obtain a displacement signal, a displacement curve is obtained through the displacement signal, and the speed and the impact frequency are obtained through calculation. The laser displacement sensor method adopted by the invention can directly align the piston for measurement without modifying or damaging the product, the measurement is convenient and flexible, and the calibration are easy. The device can realize non-contact remote measurement, and has the advantages of high speed, high precision, wide range, strong light and electric interference resistance and the like. The device has very small spot diameter, almost has no requirement on the area of a measured object, and can be far away from the measured object due to the long measuring distance, so that the device is prevented from being damaged and is prevented from being influenced by the heat radiation of the measured object. The method has no requirement on the material of the measured object, namely, the surface of the metal nonmetal object can be measured under the condition of non-transparent diffuse reflection.
The data acquisition system 10 of the present embodiment has data acquisition software, and the data acquisition software directly displays a displacement curve, directly displays pressure curves of the front cavity, the rear cavity, and the oil inlet, and directly displays a flow curve at the oil inlet and the oil return position.
Example two
As shown in fig. 7, the present embodiment provides a method for detecting performance of a hydraulic rock drill, including:
s100, completing an impact performance test by a hydraulic rock drill performance detection system, and acquiring a pressure signal, a flow signal and a displacement signal in real time;
as illustrated in fig. 8, step S100 includes:
and S110, mounting the hydraulic rock drill 1 and the flushed hydraulic cylinder 2 on the rack 3. Specifically, in order to accurately measure the motion process of the impact piston, a rear end cover connected with the impact piston of the hydraulic rock drill is disassembled, and the rear end of the impact piston is exposed. The position of the laser displacement sensor is adjusted by the manipulator 15, so that light spots of the laser displacement sensor can be accurately shot at the rear end of the impact piston. In the process of installing the pressure sensor, the cylinder body and the reversing valve cover of the rock drill are required to be reformed, holes are punched and tapped on the surface of the cylinder body, and threaded connection is adopted in order to ensure that the rock drill body does not have any influence on a pressure cavity. Laser displacement sensors and pressure sensors are connected to the data acquisition system 10.
And S120, before starting the equipment, checking whether the hydraulic pump has element abnormal conditions or not and whether the hydraulic pump has an oil leakage phenomenon or not.
S130, adjusting the impact pressure and the impact flow according to the equipment requirement, starting the test, and recording the test data.
S200, filtering displacement signals acquired by the laser displacement sensor to obtain sine signals, wherein each wave crest is equivalent to one rock drill impact, and each wave trough rock drill reaches the rear end of the shell. The high frequency motion of the impact piston has high requirements on the sampling frequency of the laser displacement sensor, and the data of the motion key is prevented from being missed, as shown in fig. 4. And deriving a nonlinear relation between a voltage signal and displacement of the laser displacement sensor according to a least square method to obtain a displacement curve.
S300, selecting a section of stable displacement curve, and calculating the piston stroke according to the displacement difference formula (1-1)
In the formula (I), the compound is shown in the specification,
stroke acceleration end point, mm;
starting point of stroke acceleration, mm.
S400, judging an impact point, determining the impact point by combining displacement data, pressure data and flow data, and judging the position of the impact point;
and S500, differentiating the displacement data through data processing to obtain a piston motion speed curve. The position speeds in the piston motion process can be calculated according to the formula (1-2), and the corresponding impact point speed can be found according to the characteristics of the impact point, as shown in fig. 2 and 3.
In the formula (I), the compound is shown in the specification,
time;
is the piston displacement. S600, selecting a section of stable data in the motion speed curve of the piston, and selecting the speed of an impact point
. The impact energy was calculated from the formula (1-3).
In the formula (I), the compound is shown in the specification,
the energy of the impact is given to the steel,
in order to impact the mass of the piston,
is the impact point velocity of the impact piston.
S700, performing fast Fourier transform on the displacement data to obtain a frequency curve, wherein the horizontal axis is frequency, the vertical axis is amplitude, the hydraulic rock drill 1 moves periodically, the impact frequency is frequency corresponding to the maximum amplitude point of 0-50Hz, and the frequency corresponding to the maximum amplitude between 50-100Hz and 100-150Hz is frequency multiplication, as shown in figure 5.
And S800, obtaining the impact power according to the impact energy and the impact frequency, which is shown in the formula (1-5).
In the formula (I), the compound is shown in the specification,
impact energy, J;
impact frequency, hz.
In step S400, impact point determination;
the method comprises the following steps: as shown in fig. 6, the peak value is observed for judgment, and a peak value is generated after the pressure action of the rear cavity is finished, which indicates that the impact piston collides with the shank, namely an impact point;
the second method comprises the following steps: as shown in fig. 6, when the flow rate is at the minimum, the buffer piston reaches the displacement limit value, and collision occurs, and the flow meter is in the middle of the pipeline, so that a transfer process exists.
Calculating pressure wave transit time
Comprises the following steps:
in the formula (I), the compound is shown in the specification,
the oil pressure wave transmission speed;
the length of the oil pipe.
Time lag of minimum flow
To advance the time
Is the point of impact
The third method comprises the following steps: as shown in fig. 6, the speed curve chart is observed, and the moment when the speed is sharply and instantaneously reduced and the moving direction is changed is the impact point.
And (3) judging the optimal impact state: whether the oil pressure of the front cavity and the rear cavity of the rock drill just completes switching at the moment of the impact point is a direct basis for judging whether the rock drill is in the optimal impact state. When the switching of the oil way of the rear cavity is ahead of the moment of the impact point, the piston braking occurs in the stroke stage, the piston is decelerated before the striking, the striking does not occur at the moment of the maximum kinetic energy of the piston, and the impact point lags behind; on the contrary, when the rear cavity oil way is switched to be later than the moment of the impact point, the piston braking does not occur in the stroke stage, but the stress of the piston is still in the impact motion direction after the impact, the impact does not occur at the moment of the maximum kinetic energy of the piston, and the impact point is advanced. The determination of the optimal impact point is instructive in optimizing the device.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A hydraulic rock drill performance detection system is characterized by comprising a hydraulic rock drill and a flushed hydraulic cylinder which are arranged on a rack, wherein the hydraulic rock drill is connected with the flushed hydraulic cylinder through a drill bit tail connecting sleeve;
the pressure sensors are arranged in the front cavity, the rear cavity and the oil inlet of the hydraulic rock drill and are used for acquiring pressure signals in real time;
the flow sensor is arranged on an oil return pipe of the rock drill on the hydraulic pump system and is used for acquiring flow signals in real time;
installing a displacement sensor for acquiring a displacement signal of the piston of the hydraulic rock drill in real time;
transmitting a pressure signal acquired by a pressure sensor, a flow signal acquired by a flow sensor and a displacement signal acquired by a displacement sensor to a computer through a data acquisition system in real time, analyzing the pressure signal, the flow signal and the displacement signal in real time to obtain an impact performance parameter of the hydraulic rock drill, analyzing the motion process of an impact piston, and determining the impact state of an impact point of the hydraulic rock drill at the moment; obtaining a pressure curve through a pressure signal, obtaining a flow curve through a flow signal, obtaining a displacement curve through a displacement signal, comparing the pressure curves of a front cavity, a rear cavity and an oil inlet, an oil return flow curve and a piston displacement curve, and monitoring the pressure and the flow of a cavity chamber at each position in the movement process of impacting a piston of the hydraulic rock drill; calculating the impact performance parameters includes: differentiating the displacement curve to obtain a speed curve, finding an impact point, obtaining the speed of the impact point, and further calculating the impact energy of the rock drill; carrying out fast Fourier transform on the displacement curve to obtain impact frequency; and obtaining impact power by calculating impact energy and impact frequency;
judging whether the rock drill is in an optimal impact state, wherein the displacement of an impact point of the rock drill is characterized by generating violent instantaneous drop and changing the motion direction, and the oil pressure of a rear cavity of the rock drill at the moment of the impact point in the impact state is just switched to judge the rock drill to be in the optimal impact state; when the switching of the oil way of the rear cavity is ahead of the moment of the impact point, the piston braking occurs in the stroke stage, the piston is decelerated before the striking, the striking does not occur at the moment of the maximum kinetic energy of the piston, and the impact point is delayed; on the contrary, when the rear cavity oil way is switched to be later than the moment of the impact point, the piston braking does not occur in the stroke stage, but the stress of the piston is still in the impact motion direction after the impact, the impact does not occur at the moment of the maximum kinetic energy of the piston, and the impact point is advanced.
2. A hydraulic rock drill performance detection system according to claim 1 wherein the displacement sensor is a laser displacement sensor.
3. A hydraulic rock drill performance detection system according to claim 1 wherein a laser displacement sensor is mounted on the gantry, the laser spot of which is struck at the rear end of the impact piston of the hydraulic rock drill.
4. A hydraulic rock drill performance detection system according to claim 1 wherein a position adjustment device is mounted on the gantry, a laser displacement sensor being mounted on the position adjustment device, the position adjustment device being capable of adjusting the position of the laser displacement sensor to determine that the laser spot of the laser displacement sensor is impinging on the rear end of the impact piston of the hydraulic rock drill.
5. The hydraulic rock drill performance detection system of claim 1, wherein a shank adapter of the hydraulic rock drill and a hydraulic rod of the impacted hydraulic cylinder are connected by a shank adapter sleeve.
6. A method of hydraulic rock drilling machine performance testing, the method using a hydraulic rock drilling machine performance testing system according to any one of claims 1 to 5, characterized in that the method comprises:
the hydraulic rock drill performance detection system completes impact performance test and collects pressure signals, flow signals and displacement signals in real time;
deriving a nonlinear relation between a voltage signal and displacement of the laser displacement sensor according to a least square method to obtain a displacement curve;
selecting a stable displacement curve and calculating the stroke of the piston;
judging an impact point, determining the impact point by combining displacement data, pressure data and flow data, and judging the position of the impact point;
obtaining a motion speed curve of the piston after differential processing of the displacement curve to obtain the speed of the impact point of the piston;
selecting a section of stable data in the motion speed curve, selecting the speed of an impact point, and calculating impact energy;
carrying out fast Fourier transform on the displacement data to obtain impact frequency;
and obtaining the impact power according to the impact energy and the impact frequency.
7. The method of detecting the performance of a hydraulic rock drill according to claim 6, characterized by comprising, in said judging the impact point:
where the impact point velocity produces a sharp instantaneous drop and changes the direction of motion.
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| 水力凿岩机冲击性能实验;李志国等;《机械设计与研究》;20110830;第27卷(第04期);73-76 * |
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| CN115356142A (en) | 2022-11-18 |
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