CN115450990B - Method and apparatus for detecting hydraulic oil leakage - Google Patents
Method and apparatus for detecting hydraulic oil leakage Download PDFInfo
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- CN115450990B CN115450990B CN202211416795.5A CN202211416795A CN115450990B CN 115450990 B CN115450990 B CN 115450990B CN 202211416795 A CN202211416795 A CN 202211416795A CN 115450990 B CN115450990 B CN 115450990B
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Abstract
The invention relates to a method and equipment for detecting hydraulic oil leakage, in particular to the technical field of hydraulic detection, and the method comprises the following steps: the data analysis unit calculates the standard displacement of each level of piston of the hydraulic equipment and the liquid filling amount corresponding to each standard displacement before liquid filling; the logic control unit controls the hydraulic pump to charge the hydraulic equipment, and the data analysis unit analyzes the first displacement of each stage of piston detected by the displacement sensor when the actual charge amount reaches the charge amount corresponding to the standard displacement of each stage of piston; the logic control unit determines whether to adjust the power of the hydraulic pump or compensate the pressure of the pressure bearing end of the hydraulic equipment according to the analysis result of the data analysis unit; the data analysis unit determines whether the hydraulic equipment has leakage and a leakage position according to the first moving speed and the second moving speed of each stage of piston; the invention improves the accuracy of detecting the leakage position of the hydraulic equipment.
Description
Technical Field
The invention relates to the technical field of hydraulic detection, in particular to a method and equipment for detecting hydraulic oil leakage.
Background
The detection of the micro-leakage of the hydraulic oil is a difficult point of the detection of a hydraulic test, for example, if the leakage occurs, not only the environment around the equipment is polluted, but also the pressure of a working cavity of a hydraulic cylinder is reduced, so that the hydraulic cylinder cannot work normally.
Chinese patent publication no: CN111795815A discloses a hydraulic cylinder internal leakage amount detection device and a detection method, including fixing a hydraulic cylinder to be detected at a stroke position of internal leakage of the hydraulic cylinder to be detected, adjusting a piston of the hydraulic cylinder to an initial position of a metering stroke, at this time, the metering stroke displayed on the detection device is zero, installing a first hydraulic pipeline, a second hydraulic pipeline, a third hydraulic pipeline, the metering hydraulic cylinder, the hydraulic cylinder to be detected and a high-pressure oil source in a matching manner, closing a first control valve, adjusting the pressure of the high-pressure oil source to a test pressure, keeping the test pressure unchanged, opening a second control valve, filling the high-pressure oil source with high-pressure oil to an oil duct compensation channel in the metering hydraulic cylinder and a hydraulic cylinder cavity to be detected, at this time, the pressure in the oil duct cavity of the hydraulic cylinder to be detected is the same as the test pressure, after the pressure in the oil duct cavity of the hydraulic cylinder to be detected is stabilized to the test pressure, opening the first control valve, then closing the second control valve, detecting the displacement sensor detects displacement amount of the piston of the metering hydraulic cylinder, and sends a detected displacement signal to the detection device, and the detection device analyzes and calculates the internal leakage amount of the hydraulic cylinder to be detected; therefore, the device and the method for detecting the internal leakage amount of the hydraulic cylinder have the problem that whether the hydraulic oil leaks or not and the leakage position of the hydraulic oil cannot be accurately detected.
Disclosure of Invention
Therefore, the invention provides a method and equipment for detecting hydraulic oil leakage, which are used for overcoming the problem that whether hydraulic oil leaks or not and the leakage position of the hydraulic oil cannot be accurately detected in the prior art.
To achieve the above object, the present invention provides a method for detecting hydraulic oil leakage, comprising:
the method comprises the following steps that S1, a data analysis unit calculates standard displacement of each level of piston of the hydraulic equipment and liquid filling amount corresponding to each standard displacement before liquid filling;
s2, controlling a hydraulic pump to charge hydraulic equipment by a logic control unit, and analyzing the first displacement of each stage of piston detected by a displacement sensor by a data analysis unit when the actual charge amount reaches the charge amount corresponding to the standard displacement of each stage of piston;
s3, the logic control unit determines whether to adjust the power of the hydraulic pump or compensate the pressure of a pressure bearing end of hydraulic equipment according to the analysis result of the data analysis unit;
s4, the data analysis unit judges whether the hydraulic equipment leaks or not according to the first moving speed of each stage of piston after the power of the hydraulic pump is adjusted and judges the leakage position of the hydraulic equipment according to the second moving speed of each stage of piston when the pressure compensation of the pressure-bearing end of the hydraulic equipment is completed;
when the logic control unit determines to adjust the power of the hydraulic pump according to the analysis result of the data analysis unit and the adjustment is completed, the data analysis unit determines the first moving speed of each stage of piston and compares the first moving speed of each stage of piston with a preset moving speed, and the logic control unit preliminarily judges whether the hydraulic equipment leaks according to the comparison result;
and the logic control unit determines to compensate the pressure of the pressure bearing end of the hydraulic equipment according to the analysis result of the data analysis unit, determines the second moving speed of each stage of piston when the compensation is completed, compares the second moving speed of each stage of piston with the preset moving speed, and judges the leakage position of the hydraulic equipment according to the comparison result.
Further, when the data analysis unit analyzes the first displacement amount of each stage of piston detected by the displacement sensor, the data analysis unit determines the first displacement amount L of each stage of piston and compares the first displacement amount L with the standard displacement amount L1 of each stage of piston, the logic control unit judges whether the first displacement amount of each stage of piston reaches the standard or not according to the comparison result,
if L = L1, the logic control unit judges that the first displacement of the piston of each stage reaches the standard;
and if the L is less than the L1, the logic control unit judges that the first displacement of the piston of each stage does not reach the standard.
Further, when the logic control unit judges that the first displacement of the piston of each stage does not reach the standard, the data analysis unit calculates a first displacement difference DeltaL between the first displacement L of the piston of each stage and a standard displacement L1, sets DeltaL = L1-L, compares the first displacement difference DeltaL with a preset displacement difference DeltaL 1, and the logic control unit determines a processing mode of the hydraulic equipment according to a comparison result,
if the delta L is less than or equal to the delta L1, the logic control unit determines to compensate the pressure of the pressure-bearing end of the hydraulic equipment;
if DeltaL >. DeltaL 1, the logic control unit determines whether the power of the hydraulic pump is adjustable.
Further, when the logic control unit determines whether the power of the hydraulic pump is adjustable, the data analysis unit calculates a power ratio Q of an initial power P of the hydraulic pump to a rated power Pe, sets Q = P/Pe, and compares the power ratio Q with a preset power ratio Q0,
if Q is less than Q0, the data analysis unit determines that the power of the hydraulic pump is adjustable;
and if Q is larger than or equal to Q0, the data analysis unit determines that the power of the hydraulic pump is not adjustable.
Further, when the data analysis unit determines that the power of the hydraulic pump is adjustable, the data analysis unit calculates a ratio W of a difference between the first displacement difference and a preset displacement difference, and sets W =Δl/. DELTA.l 1, the logic control unit is configured to adjust the power of the hydraulic pump according to the ratio W of the difference, set the adjusted power of the hydraulic pump to P1, and set P1= P × Ki, where P is the initial power of the hydraulic pump, ki is a power adjustment coefficient of the hydraulic pump, and i is 1,2, or 3.
Further, when the logic control unit finishes power adjustment of the hydraulic pump, the data analysis unit determines a first moving speed V of the piston at each stage, sets V = L/T, compares the first moving speed V of the piston at each stage with a preset moving speed V1, and the logic control unit determines whether the hydraulic equipment leaks according to a comparison result, wherein T is the time length of the piston reaching a first displacement amount,
if V is less than V1, the logic control unit preliminarily judges that the hydraulic equipment leaks;
and if the V is larger than or equal to the V1, the logic control unit judges that the hydraulic equipment has no leakage.
Further, when the logic control unit determines to compensate the pressure at the pressure-bearing end of the hydraulic device, the logic control unit is configured to set the compensated pressure at the pressure-bearing end of the hydraulic device to be F4 according to a compensation value of the difference value W to the pressure at the pressure-bearing end of the hydraulic device, and set F4= F + Fn, where F is an initial pressure at the pressure-bearing end of the hydraulic device, and n is 1,2, or 3.
Further, when the logical control unit completes pressure compensation of the pressure bearing end of the hydraulic equipment, the data analysis unit determines a second displacement L 'of each stage of the piston, and compares the second displacement L' with a standard displacement L1 of each stage of the piston, the logical control unit judges whether the second displacement of each stage of the piston reaches the standard according to the comparison result,
if L' = L1, the logic control unit judges that the second displacement of the piston of each stage reaches the standard;
and if L' is less than L1, the logic control unit judges that the second displacement of the piston of each stage does not reach the standard.
Further, when the logic control unit determines that the second displacement amount of the piston of each stage does not reach the standard, the data analysis unit determines a second moving speed V 'of the piston of each stage, sets V' = L '/T', compares the second moving speed V 'of the piston of each stage with a preset moving speed V1, and the logic control unit determines the leakage position of the hydraulic equipment according to the comparison result, wherein T' is the time length for the piston of each stage to reach the second displacement amount,
if V' is less than V1, the logic control unit judges that the hydraulic equipment is internally leaked;
if V' is more than or equal to V1, the logic control unit judges that the hydraulic equipment leaks outside.
Further, the detection device for detecting the hydraulic oil leakage method includes an oil tank, and is characterized by further including:
the displacement sensors are arranged in the pistons of all stages of the hydraulic equipment to be detected and are used for detecting the positions of the pistons;
the hydraulic system comprises an oil inlet pipe and an oil outlet pipe, wherein the oil inlet pipe is arranged outside hydraulic equipment to be detected and used for conveying hydraulic oil to the hydraulic equipment to be detected, and the oil outlet pipe is used for outputting the hydraulic oil from the hydraulic equipment to be detected;
the hydraulic pump is arranged on the oil outlet pipe between the equipment to be detected and the oil tank and used for filling liquid into the equipment to be detected;
the supercharging device is arranged at the pressure bearing end of the equipment to be detected and is used for increasing pressure to each stage of piston;
the data analysis unit is connected with the displacement sensor and used for calculating the standard displacement of each stage of piston and the liquid filling amount corresponding to the standard displacement, and analyzing the actual displacement of each stage of piston and the liquid filling amount corresponding to the actual displacement;
and the logic control unit is connected with the data analysis unit and used for controlling the hydraulic pump to charge the hydraulic equipment and judging the analysis result of the data analysis unit.
Compared with the prior art, the method has the beneficial effects that the first displacement of each stage of piston is determined by analyzing the pressure of the pressure-bearing end of the hydraulic equipment, the liquid filling power of the hydraulic pump and the liquid filling duration of hydraulic oil, and the first displacement is compared with the standard displacement calculated before liquid filling, so that whether the first displacement reaches the standard or not is judged, if the first displacement reaches the standard, no leakage condition exists in the hydraulic equipment, and if the first displacement does not reach the standard, the hydraulic equipment is continuously detected, so that the accuracy of detecting the leakage position of the hydraulic equipment is further improved.
Further, when the first displacement of each stage of the piston does not reach the standard, the processing mode of the hydraulic equipment is determined by calculating the first displacement difference between the first displacement and the standard displacement, when the first displacement difference is smaller than or equal to the preset displacement difference, the pressure of the pressure bearing end of the hydraulic equipment is compensated, when the first displacement difference is larger than the preset displacement difference, whether the power of the hydraulic pump is adjustable is determined, whether the hydraulic equipment leaks and the leakage position of the hydraulic equipment is determined, and the accuracy of detecting the leakage position of the hydraulic equipment is further improved.
Further, the data analysis unit calculates a power ratio of initial power and rated power of the hydraulic pump, and determines whether the power of the hydraulic pump is adjustable according to a comparison result of the power ratio and a preset power ratio, when the power ratio is smaller than the preset power ratio, it is indicated that the power of the hydraulic pump has an adjustable space, when the power ratio is larger than or equal to the preset power ratio, it is indicated that the power of the hydraulic pump has no adjustable space, namely when the power ratio reaches the preset power ratio, the first displacement amount does not reach the standard, it is determined that the hydraulic equipment is leaked, and the accuracy of detecting whether the hydraulic equipment is leaked is further improved.
Furthermore, the power of the hydraulic pump is adjusted by calculating the ratio of the first displacement difference value of each stage of piston to the difference value of the preset displacement difference value, so that the proper power of the hydraulic pump is determined to charge the hydraulic equipment, whether the moving speed of each stage of piston is qualified or not is determined, and the accuracy of detecting whether the hydraulic equipment leaks or not is further improved.
Further, when the power adjustment of the hydraulic pump is completed, the first displacement amount of each stage of piston and the time length of each stage of piston reaching the first displacement amount are analyzed, the first moving speed of each stage of piston is calculated, the first moving speed is used as a characteristic parameter for evaluating whether the hydraulic equipment leaks, and if the first moving speed does not reach the preset moving speed, the leakage condition of the hydraulic equipment is indicated, so that the accuracy of detecting whether the hydraulic equipment leaks is further improved.
Furthermore, the invention determines to compensate the pressure of the pressure-bearing end of the hydraulic equipment by calculating the difference value of the first displacement amount and the first displacement amount of the standard displacement amount, and determines the compensation value of the pressure-bearing end of the hydraulic equipment according to the ratio of the difference value of the first displacement amount to the difference value of the preset displacement amount, so as to determine whether the second displacement amount of each stage of piston reaches the standard or not, thereby further improving the accuracy of detecting the leakage position of the hydraulic equipment.
Further, when pressure compensation of the pressure bearing end of the hydraulic equipment is completed, the second displacement of each stage of piston is determined and compared with the standard displacement, whether the second displacement reaches the standard or not is judged, if the second displacement reaches the standard, no leakage of the hydraulic equipment can be judged, and the accuracy of detecting whether the hydraulic equipment leaks or not is further improved.
Further, the second displacement amount of each stage of piston and the time length of each stage of piston reaching the second displacement amount are analyzed, the second moving speed of each stage of piston is calculated, the second moving speed is used as a characteristic parameter for evaluating the leakage position of the hydraulic equipment, if the second moving speed does not reach the preset moving speed, the internal leakage is detected, and if the second moving speed reaches or exceeds the second moving speed, the external leakage is detected, so that the accuracy of detecting the leakage position of the hydraulic equipment is further improved.
Further, when whether the internal leakage of the hydraulic equipment is completed or not is determined, the specific leakage position of the hydraulic equipment is further determined through ultrasonic detection, and therefore the accuracy of detection of the leakage position of the hydraulic equipment is further improved.
Drawings
Fig. 1 is a flowchart of a method for detecting hydraulic oil leakage according to the present invention;
FIG. 2 is a flow chart of a method for detecting hydraulic oil leakage according to the present invention;
FIG. 3 is a schematic structural diagram of a detection apparatus of the method for detecting hydraulic oil leakage according to the present invention;
fig. 4 is a logic block diagram of a detection apparatus of the method for detecting hydraulic oil leakage according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.
Referring to fig. 1 and 2, fig. 1 is a flow chart of a method for detecting hydraulic oil leakage according to the present invention; fig. 2 is a flowchart of a method for detecting hydraulic oil leakage according to the present invention.
In an embodiment of the present invention, a method for detecting hydraulic oil leakage includes:
step S1, calculating standard displacement of each level of piston of hydraulic equipment and liquid filling amount corresponding to each standard displacement by a data analysis unit before liquid filling;
s2, a logic control unit controls a hydraulic pump to fill liquid into hydraulic equipment, and a data analysis unit analyzes the first displacement of each stage of piston detected by a displacement sensor when the actual liquid filling amount reaches the liquid filling amount corresponding to the standard displacement of each stage of piston;
s3, the logic control unit determines whether to adjust the power of the hydraulic pump or compensate the pressure of a pressure bearing end of the hydraulic equipment according to the analysis result of the data analysis unit;
and S4, the data analysis unit judges whether the hydraulic equipment leaks or not according to the first moving speed of each stage of piston after the power of the hydraulic pump is adjusted and judges the leakage position of the hydraulic equipment according to the second moving speed of each stage of piston when the pressure compensation of the pressure bearing end of the hydraulic equipment is finished.
Specifically, when the data analysis unit analyzes the first displacement amount of each stage of piston detected by the displacement sensor, the data analysis unit determines the first displacement amount L of each stage of piston and compares the first displacement amount L with the standard displacement amount L1 of each stage of piston, the logic control unit determines whether the first displacement amount of each stage of piston reaches the standard according to the comparison result,
if L = L1, the logic control unit judges that the first displacement of the piston of each stage reaches the standard;
and if the L is less than the L1, the logic control unit judges that the first displacement of the piston of each stage does not reach the standard.
Specifically, when the logic control unit judges that the first displacement of the piston of each stage does not meet the standard, the data analysis unit calculates a first displacement difference Δ L between the first displacement L of the piston of each stage and a standard displacement L1, sets Δ L = L1-L, compares the first displacement difference Δ L with a preset displacement difference Δ L1, and determines the processing mode of the hydraulic equipment according to the comparison result,
if the delta L is not more than the delta L1, the logic control unit determines to compensate the pressure of the pressure bearing end of the hydraulic equipment;
if DeltaL >. DeltaL 1, the logic control unit determines whether the power of the hydraulic pump is adjustable.
Specifically, when the logic control unit determines whether the power of the hydraulic pump is adjustable, the data analysis unit calculates a power ratio Q of an initial power P of the hydraulic pump to a rated power Pe, sets Q = P/Pe, and compares the power ratio Q with a preset power ratio Q0,
if Q is less than Q0, the data analysis unit determines that the power of the hydraulic pump is adjustable;
and if Q is larger than or equal to Q0, the data analysis unit determines that the power of the hydraulic pump is not adjustable.
Specifically, when the data analysis unit determines that the power of the hydraulic pump is adjustable, the data analysis unit calculates a ratio W of a difference between the first displacement difference and a preset displacement difference, sets W =Δl/. DELTA.l 1, compares the ratio of the difference with a preset ratio, and the logic control unit adjusts the power of the hydraulic pump according to the comparison result,
wherein the logic control unit is provided with a first preset ratio W1, a second preset ratio W2, a first regulating coefficient R1, a second regulating coefficient R2 and a third regulating coefficient R3, wherein W1 is more than W2, R1 is more than 1 and more than R2 is more than R3 and less than 1.2,
if W is less than or equal to W1, the logic control unit judges that a first adjusting coefficient R1 is selected to adjust the power of the hydraulic pump;
if W1 is larger than W and is not larger than W2, the logic control unit judges that a second adjusting coefficient R2 is selected to adjust the power of the hydraulic pump;
if W is larger than W2, the logic control unit judges that a third adjusting coefficient R3 is selected to adjust the power of the hydraulic pump;
when the logic control unit judges that the ith adjusting coefficient Ki is selected to adjust the power of the hydraulic pump, the adjusted power of the hydraulic pump is set to be P1, and P1= P multiplied by Ki is set, wherein P is the initial power of the hydraulic pump, ki is the power adjusting coefficient of the hydraulic pump, and i is 1,2 or 3.
Specifically, when the logic control unit completes power adjustment of the hydraulic pump, the data analysis unit determines a first moving speed V of each stage of the piston, sets V = L/T, compares the first moving speed V of each stage of the piston with a preset moving speed V1, and the logic control unit determines whether the hydraulic equipment leaks according to a comparison result, where T is a time length for the piston to reach a first displacement amount,
if V is less than V1, the logic control unit preliminarily judges that the hydraulic equipment leaks;
and if V is larger than or equal to V1, the logic control unit judges that the hydraulic equipment has no leakage.
In the embodiment of the invention, the preset moving speed is the ratio of the initial power of the hydraulic pump to the initial pressure of the pressure bearing end of the hydraulic equipment.
In the embodiment of the invention, when the logic control unit judges that the hydraulic equipment leaks, the data analysis unit compensates the pressure of the pressure-bearing end of the hydraulic equipment, so as to further judge whether the internal leakage exists.
Specifically, when the logic control unit determines to compensate the pressure of the pressure-bearing end of the hydraulic equipment, the logic control unit determines a compensation value for the pressure of the pressure-bearing end of the hydraulic equipment according to a comparison result of a difference value ratio W and a preset ratio,
wherein, the logic control unit is also provided with a first pressure compensation value F1, a second pressure compensation value F2 and a third pressure compensation value F3, wherein F1 is more than F2 and less than F3,
if W is less than or equal to W1, the logic control unit sets the compensation value of the pressure bearing end of the hydraulic equipment to be F1;
if W1 is larger than W and smaller than or equal to W2, the logic control unit sets the compensation value of the pressure-bearing end pressure of the hydraulic equipment to be F2;
if W is larger than W2, the logic control unit sets the compensation value of the pressure-bearing end pressure of the hydraulic equipment to be F3;
when the logic control unit judges that the nth pressure compensation value is selected to perform pressure compensation on the pressure-bearing end of the hydraulic equipment, the pressure of the compensated pressure-bearing end of the hydraulic equipment is set to be F4, and F4= F + Fn is set, wherein F is the initial pressure of the pressure-bearing end of the hydraulic equipment, and n is 1,2 or 3.
Specifically, when the logic control unit completes pressure compensation of the pressure-bearing end of the hydraulic equipment, the data analysis unit determines the second displacement L 'of each stage of the piston, compares the second displacement L' with the standard displacement L1 of each stage of the piston, and the logic control unit judges whether the second displacement of each stage of the piston reaches the standard according to the comparison result,
if L' = L1, the logic control unit judges that the second displacement of the piston of each stage reaches the standard;
and if L' is less than L1, the logic control unit judges that the second displacement of the piston of each stage does not reach the standard.
Specifically, when the logic control unit determines that the second displacement amount of each stage of the piston does not reach the standard, the data analysis unit determines the second displacement speed V 'of each stage of the piston, sets V' = L '/T', compares the second displacement speed V 'of each stage of the piston with a preset displacement speed V1, and the logic control unit determines the leakage position of the hydraulic equipment according to the comparison result, wherein T' is the time length for each stage of the piston to reach the second displacement amount,
if V' is less than V1, the logic control unit judges that the hydraulic equipment is internally leaked;
and if V' is more than or equal to V1, the logic control unit judges that the hydraulic equipment is leaked from the outside.
In the embodiment of the invention, when the logic control unit judges that the hydraulic equipment has internal leakage, the data analysis unit determines the piston stage number of hydraulic oil leakage according to the displacement of each stage of piston.
In the embodiment of the present invention, when it is determined that the leakage position is a certain stage of piston, an ultrasonic detection device (not shown in the figure) performs ultrasonic detection on the hydraulic device, and further determines a specific leakage position of the hydraulic device.
Referring to fig. 3 and 4, fig. 3 is a schematic structural diagram of a detection apparatus for detecting hydraulic oil leakage according to the method of the present invention; fig. 4 is a logic block diagram of a detection apparatus of a method for detecting hydraulic oil leakage according to the present invention.
In an embodiment of the present invention, the detection apparatus for detecting hydraulic oil leakage according to the method includes:
an oil tank 1;
the displacement sensors 3 are arranged in the pistons 2 of all stages of the hydraulic equipment to be detected and used for detecting the positions of the pistons;
an oil inlet pipe 4 which is arranged outside the hydraulic equipment to be detected and used for conveying hydraulic oil to the hydraulic equipment to be detected and an oil outlet pipe 5 used for outputting the hydraulic oil from the hydraulic equipment to be detected,
the hydraulic pump 6 is arranged on the oil outlet pipe 5 between the equipment to be detected and the oil tank 1 and is used for charging the equipment to be detected;
the supercharging device 7 is arranged at the pressure-bearing end of the equipment to be detected and is used for increasing pressure to each stage of piston;
the data analysis unit is connected with the displacement sensor and used for calculating the standard displacement of each stage of piston and the liquid filling amount corresponding to the standard displacement, and analyzing the actual displacement of each stage of piston and the liquid filling amount corresponding to the actual displacement;
and the logic control unit is connected with the data analysis unit and used for controlling the hydraulic pump to charge the hydraulic equipment and judging the analysis result of the data analysis unit.
In the embodiment of the invention, the data analysis unit is used for analyzing the first displacement of each stage of piston detected by the displacement sensor, and the logic control unit is used for judging whether the first displacement of each stage of piston reaches the standard or not according to the comparison result of the first displacement and the standard displacement of each stage of piston; the data analysis unit calculates a first displacement difference value between a first displacement and a standard displacement of the piston at each stage, and the logic control unit determines a processing mode of the hydraulic equipment according to the first displacement difference value; the data analysis unit calculates the power ratio of the initial power and the rated power of the hydraulic pump and compares the power ratio with a preset power ratio; the data analysis unit calculates the ratio of the difference value of the first displacement difference value to the difference value of a preset displacement difference value, and the logic control unit adjusts the power of the hydraulic pump according to the comparison result of the ratio of the difference value to a preset ratio; the data analysis unit determines first moving speeds of all stages of pistons, and the logic control unit judges whether the hydraulic equipment leaks or a compensation value for pressure of a pressure bearing end of the hydraulic equipment is determined according to a comparison result of the first moving speeds of all stages of pistons and a preset moving speed; the data analysis unit determines second displacement of each stage of piston, and the logic control unit judges whether the second displacement of each stage of piston reaches the standard or not according to the comparison result of the second displacement of each stage of piston and the standard displacement; the data analysis unit determines second moving speeds of the pistons at all stages, and the logic control unit judges the leakage position of the hydraulic equipment according to the comparison result of the second moving speeds of the pistons at all stages and the preset moving speed.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for detecting hydraulic oil leakage, comprising:
the method comprises the following steps that S1, a data analysis unit calculates standard displacement of each level of piston of the hydraulic equipment and liquid filling amount corresponding to each standard displacement before liquid filling;
s2, a logic control unit controls a hydraulic pump to fill liquid into hydraulic equipment, and a data analysis unit analyzes the first displacement of each stage of piston detected by a displacement sensor when the actual liquid filling amount reaches the liquid filling amount corresponding to the standard displacement of each stage of piston;
s3, the logic control unit determines whether to adjust the power of the hydraulic pump or compensate the pressure of a pressure bearing end of the hydraulic equipment according to the analysis result of the data analysis unit;
s4, the data analysis unit judges whether the hydraulic equipment leaks or not according to the first moving speed of each stage of piston after the power of the hydraulic pump is adjusted and judges the leakage position of the hydraulic equipment according to the second moving speed of each stage of piston when the pressure compensation of the pressure bearing end of the hydraulic equipment is finished;
when the logic control unit determines to adjust the power of the hydraulic pump according to the analysis result of the data analysis unit and the adjustment is completed, the data analysis unit determines the first moving speed of each stage of piston and compares the first moving speed of each stage of piston with the preset moving speed, and the logic control unit preliminarily judges whether the hydraulic equipment leaks according to the comparison result;
and the logic control unit determines to compensate the pressure of the pressure bearing end of the hydraulic equipment according to the analysis result of the data analysis unit, determines the second moving speed of each stage of piston when the compensation is completed, compares the second moving speed of each stage of piston with the preset moving speed, and judges the leakage position of the hydraulic equipment according to the comparison result.
2. The method for detecting hydraulic oil leakage according to claim 1, wherein when the data analysis unit analyzes the first displacement amount of each stage of piston detected by the displacement sensor, the data analysis unit determines the first displacement amount L of each stage of piston and compares the first displacement amount L with the standard displacement amount L1 of each stage of piston, the logic control unit determines whether the first displacement amount of each stage of piston reaches the standard according to the comparison result,
if L = L1, the logic control unit judges that the first displacement of the piston of each stage reaches the standard;
and if L is less than L1, the logic control unit judges that the first displacement of the piston of each stage does not reach the standard.
3. The method for detecting hydraulic oil leakage according to claim 2, wherein when the logic control unit determines that the first displacement amount of the piston at each stage does not meet the criterion, the data analysis unit calculates a first displacement amount difference Δ L between the first displacement amount L of the piston at each stage and a standard displacement amount L1, sets Δ L = L1-L, compares the first displacement amount difference Δ L with a preset displacement amount difference Δ L1, and the logic control unit determines a handling manner of the hydraulic equipment according to the comparison result,
if the delta L is not more than the delta L1, the logic control unit determines to compensate the pressure of the pressure bearing end of the hydraulic equipment;
if Δ L > Δl1, the logic control unit determines whether the power of the hydraulic pump is adjustable.
4. The method for detecting hydraulic oil leakage according to claim 3, wherein when the logic control unit determines whether the power of the hydraulic pump is adjustable, the data analysis unit calculates a power ratio Q of an initial power P of the hydraulic pump to a rated power Pe, sets Q = P/Pe, and compares the power ratio Q with a preset power ratio Q0,
if Q is less than Q0, the data analysis unit determines that the power of the hydraulic pump is adjustable;
and if Q is larger than or equal to Q0, the data analysis unit determines that the power of the hydraulic pump is not adjustable.
5. The method for detecting hydraulic oil leakage according to claim 4, wherein when the data analysis unit determines that the power of the hydraulic pump is adjustable, the data analysis unit calculates a ratio W of a difference between the first displacement difference and a preset displacement difference, and sets W =ΔL/. DELTA.L 1, and the logic control unit adjusts the power of the hydraulic pump according to the ratio W, and sets the adjusted power of the hydraulic pump to P1, and sets P1= P x Ki, where P is an initial power of the hydraulic pump, ki is a power adjustment coefficient of the hydraulic pump, and i is 1,2, or 3.
6. The method for detecting hydraulic oil leakage according to claim 5, wherein when the logic control unit completes the power adjustment of the hydraulic pump, the data analysis unit determines a first moving speed V of the piston at each stage, sets V = L/T, compares the first moving speed V of the piston at each stage with a preset moving speed V1, and the logic control unit determines whether the hydraulic device leaks according to the comparison result, wherein T is a time period for the piston to reach a first displacement amount,
if V is less than V1, the logic control unit preliminarily judges that the hydraulic equipment leaks;
and if V is larger than or equal to V1, the logic control unit judges that the hydraulic equipment has no leakage.
7. The method for detecting hydraulic oil leakage according to claim 6, wherein when the logic control unit determines to compensate the pressure at the pressure receiving end of the hydraulic device, the logic control unit is configured to set the compensated pressure at the pressure receiving end of the hydraulic device to F4, where F is an initial pressure at the pressure receiving end of the hydraulic device and n is 1,2 or 3, according to a compensation value of the difference value W to the pressure at the pressure receiving end of the hydraulic device, and set F4= F + Fn.
8. The method according to claim 7, wherein when the pressure compensation of the pressure-bearing end of the hydraulic device is completed by the logic control unit, the data analysis unit determines a second displacement L 'of each stage of the piston and compares the second displacement L' with a standard displacement L1 of each stage of the piston, the logic control unit determines whether the second displacement of each stage of the piston reaches the standard according to the comparison result,
if L' = L1, the logic control unit judges that the second displacement of the piston of each stage reaches the standard;
and if L' is less than L1, the logic control unit judges that the second displacement of the piston of each stage does not reach the standard.
9. The method according to claim 8, wherein when the logic control unit determines that the second displacement amount of the piston at each stage does not reach the standard, the data analysis unit determines a second moving speed V 'of the piston at each stage, sets V' = L '/T', compares the second moving speed V 'of the piston at each stage with a preset moving speed V1, and the logic control unit determines the leakage position of the hydraulic apparatus according to the comparison result, wherein T' is a time period for the piston at each stage to reach the second displacement amount,
if V' is less than V1, the logic control unit judges that the hydraulic equipment is internally leaked;
and if V' is more than or equal to V1, the logic control unit judges that the hydraulic equipment is leaked from the outside.
10. The detection apparatus for a method of detecting hydraulic oil leakage according to any one of claims 1 to 9, including a tank, characterized by further comprising:
the displacement sensors are arranged in the pistons of all stages of the hydraulic equipment to be detected and are used for detecting the positions of the pistons;
the hydraulic system comprises an oil inlet pipe and an oil outlet pipe, wherein the oil inlet pipe is arranged outside hydraulic equipment to be detected and used for conveying hydraulic oil to the hydraulic equipment to be detected, and the oil outlet pipe is used for outputting the hydraulic oil from the hydraulic equipment to be detected;
the hydraulic pump is arranged on the oil outlet pipe between the equipment to be detected and the oil tank and used for filling liquid into the equipment to be detected;
the supercharging device is arranged at the pressure-bearing end of the equipment to be detected and is used for increasing pressure to each stage of piston;
the data analysis unit is connected with the displacement sensor and used for calculating the standard displacement of each stage of piston and the liquid filling amount corresponding to the standard displacement, and analyzing the actual displacement of each stage of piston and the liquid filling amount corresponding to the actual displacement;
and the logic control unit is connected with the data analysis unit and used for controlling the hydraulic pump to charge the hydraulic equipment and judging the analysis result of the data analysis unit.
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| CN100590406C (en) * | 2007-08-07 | 2010-02-17 | 蔡茂林 | Intelligent gas leakage detector for introducing refernece flow |
| EP3196623A1 (en) * | 2016-01-25 | 2017-07-26 | Primetals Technologies Germany GmbH | Simple leakage detection in a hydraulic cylinder unit |
| CN205605540U (en) * | 2016-04-25 | 2016-09-28 | 中冶赛迪工程技术股份有限公司 | Equipment in high accuracy pneumatic cylinder |
| JP2017207078A (en) * | 2016-05-16 | 2017-11-24 | Ｋｙｂ株式会社 | Liquid leakage detection device |
| DE102018209793A1 (en) * | 2018-06-18 | 2019-12-19 | Zf Friedrichshafen Ag | Method and control device for determining leakage in a pneumatic control system |
| CN112324745B (en) * | 2019-09-24 | 2022-06-10 | 杨丽璇 | Portable hydraulic system leakage signal acquisition device and acquisition method thereof |
| DE102019133491A1 (en) * | 2019-12-09 | 2021-06-10 | Liebherr-Components Kirchdorf GmbH | Device and method for leak detection in a hydraulic cylinder |
| CN111075794B (en) * | 2020-01-10 | 2022-06-14 | 上海振华重工(集团)股份有限公司 | Method and device for monitoring leakage of hydraulic system |
| CN111795815A (en) * | 2020-07-21 | 2020-10-20 | 湖南省产商品质量监督检验研究院 | Device and method for detecting leakage in hydraulic cylinder |
| CN216207357U (en) * | 2021-11-04 | 2022-04-05 | 卫圣康医学科技(江苏)有限公司 | Testing device for detecting gas leakage |
| CN113945326B (en) * | 2021-12-21 | 2022-03-22 | 广州市腾嘉自动化仪表有限公司 | Hyperspectral infrared gas leakage detection system and method |
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