CN108953295B - Pipe burst detection system and detection method for hydraulic motor endurance test - Google Patents
Pipe burst detection system and detection method for hydraulic motor endurance test Download PDFInfo
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- CN108953295B CN108953295B CN201810678029.3A CN201810678029A CN108953295B CN 108953295 B CN108953295 B CN 108953295B CN 201810678029 A CN201810678029 A CN 201810678029A CN 108953295 B CN108953295 B CN 108953295B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B20/005—Leakage; Spillage; Hose burst
Abstract
The invention belongs to the technical field of hydraulic circuit pipeline detection, and particularly relates to a pipe burst detection system and method for a hydraulic motor durability test. The pipe burst detection system for the hydraulic motor endurance test comprises a hydraulic pump and a hydraulic motor which form a hydraulic system loop, a closed loop provided with an overflow valve is connected between the hydraulic pump and the hydraulic motor, a P port pressure sensor of the hydraulic pump is arranged at a P port of the hydraulic pump, an S port of the hydraulic pump is provided with an S port pressure sensor of the hydraulic pump, an A port of the hydraulic motor is provided with an A port pressure sensor of the hydraulic motor, and a B port of the hydraulic motor is provided with a B port pressure sensor of the hydraulic motor. By using the pipe burst detection system and method for the hydraulic motor endurance test, failure of detection results caused by errors of the sensor is avoided, accuracy of pipe burst detection is improved, reaction is rapid, and economic loss and production delay caused by pipe burst are reduced.
Description
Technical Field
The invention belongs to the technical field of hydraulic circuit pipeline detection, and particularly relates to a pipe burst detection system and method for a hydraulic motor durability test.
Background
In construction machinery, a hydraulic hose is generally used in a medium-high pressure circuit, but the service life of the hose is reduced in the process of medium-high pressure change of the hose. Therefore, after the rubber tube bursts, a large amount of oil is lost, and the system cannot be stopped in time to cause certain loss to property and equipment. As the endurance test period of the hydraulic motor is long (usually 3 months), and manual intervention is generally not needed during the test operation period, unattended operation is realized. However, the hydraulic pipeline is easy to damage under high temperature and high pressure, and if the hydraulic pipeline is unattended, a large amount of oil is inevitably lost, and a test room is polluted, so that the hydraulic pipeline needs to be shut down in time after pipe explosion, and equipment and property safety are protected.
The existing pipeline detection technology mainly comprises image recognition, external equipment and pressure detection. The image recognition principle is that a group of pictures are collected before an experiment to serve as a template, a plurality of groups of pictures are continuously collected during the experiment, pixel or brightness difference between the experiment pictures and the template pictures is compared, if the difference is large, obvious change in the images is considered to occur, and pipe explosion of equipment can be considered to occur. The external equipment is added with mechanical structure outside the pipeline, and when the rubber tube bursts, oil flows out, and then the system detects whether oil exists in the oil collecting tank to judge the tube burst. Pressure detection is often used in water pressure detection, and detection of pipe bursting is performed by detecting pressure changes.
The oil collecting tank is required to be added on the outer side of the rubber pipe by adding an external scheme, so that the cost of equipment is increased, meanwhile, the method is only suitable for occasions with small equipment volume, and if the pipeline is long, the oil collecting tank is difficult to ensure to be installed beside all pipelines. The normal action of the structure in the equipment can not be excluded by the image recognition detection principle, if an executive part in the equipment acts (such as hydraulic cylinder lifting), the system can recognize that obvious change occurs in the image, and the false alarm is a pipe burst, so that the system is stopped, namely the system cannot detect the normal change of the image to stop, and the limitation is large. The pressure detection is accurate, but if the pressure sensor is damaged, the equipment still can be regarded as a pipe burst and is stopped, so that the phenomenon that the pipe burst is detected due to the damage of the pressure sensor cannot be eliminated.
Disclosure of Invention
The present invention is directed to solving at least one of the problems set forth above, and the object is achieved by the following means.
The invention provides a pipe burst detection system for a hydraulic motor endurance test, which comprises a hydraulic pump and a hydraulic motor forming a hydraulic system loop, wherein a closed loop provided with an overflow valve is connected between the hydraulic pump and the hydraulic motor, the overflow valve can directly guide the redundant oil quantity of an oil inlet pipeline of the hydraulic motor into an oil return pipeline of the hydraulic motor through the closed loop, a P port of the hydraulic pump is provided with a P port pressure sensor of the hydraulic pump, an S port of the hydraulic pump is provided with a S port pressure sensor of the hydraulic pump, an A port of the hydraulic motor is provided with a A port pressure sensor of the hydraulic motor, a B port of the hydraulic motor is provided with a B port pressure sensor of the hydraulic motor, the P port pressure sensor of the hydraulic pump and the A port pressure sensor of the hydraulic motor are used for jointly detecting a connecting pipeline from the P port of the hydraulic pump to the A port of the hydraulic, the hydraulic pump S port pressure sensor and the hydraulic motor B port pressure sensor are used for jointly detecting a connecting pipeline from the hydraulic pump S port to the hydraulic motor B port, and the hydraulic motor A port pressure sensor and the hydraulic motor B port pressure sensor are used for jointly detecting a pipeline where a closed loop overflow valve is located.
Further, the pipe burst detection system for the hydraulic motor endurance test further comprises a hydraulic motor housing outlet flow sensor and a hydraulic motor housing outlet pressure sensor, wherein the hydraulic motor housing outlet flow sensor and the hydraulic motor housing outlet pressure sensor are both arranged on the hydraulic motor housing oil outlet pipeline.
Further, as above, the pipe burst detection system for the hydraulic motor endurance test further comprises a hydraulic motor housing inlet flow sensor and a hydraulic motor housing inlet pressure sensor, wherein the hydraulic motor housing inlet flow sensor and the hydraulic motor housing inlet pressure sensor are both arranged on a hydraulic motor housing oil inlet pipeline.
Further, according to the pipe burst detection system for the hydraulic motor durability test, the hydraulic pump is a bidirectional variable hydraulic pump, and the hydraulic motor is a bidirectional quantitative hydraulic motor.
Further, as described above, the pipe burst detection system for the hydraulic motor endurance test further includes a first check valve, a second check valve, a third check valve and a fourth check valve, the first check valve is disposed between the port P of the hydraulic pump and the overflow valve, and the communication of the first check valve enables hydraulic oil to be introduced into the overflow valve from the port P of the hydraulic pump, the second check valve is disposed between the port S of the hydraulic pump and the overflow valve, and the communication of the second check valve enables hydraulic oil to be introduced into the overflow valve from the port S of the hydraulic pump, the third check valve is disposed between the port B of the hydraulic motor and the overflow valve, and the communication of the third check valve enables hydraulic oil to be introduced into an oil return pipeline of the port B of the hydraulic motor from the overflow valve, and the fourth check valve is disposed between the port a of the hydraulic motor and the overflow valve, and the fourth check valve is communicated to lead hydraulic oil from the overflow valve to an oil return pipeline of an A port of the hydraulic motor.
Further, according to the pipe burst detection system for the hydraulic motor durability test, a filter and a cooler are further arranged on a pipeline where the closed loop overflow valve is located, and the filter and the cooler are sequentially connected in series on an oil return pipeline of the overflow valve.
The invention also provides a pipe burst detection method for the hydraulic motor endurance test, which is used for detecting according to the pipe burst detection system for the hydraulic motor endurance test and comprises the following steps:
detecting the readings of a pressure sensor at a P port of the hydraulic pump and the readings of a pressure sensor at an A port of the hydraulic motor simultaneously within a first detection cycle time, wherein when the readings of the pressure sensor at the P port of the hydraulic pump and the readings of the pressure sensor at the A port of the hydraulic motor are smaller than a calibrated oil port pressure value simultaneously, a connecting pipeline from the P port of the hydraulic pump to the A port of the hydraulic motor bursts, and when only one of the readings of the pressure sensor at the P port of the hydraulic pump and the readings of the pressure sensor at the A port of the hydraulic motor is smaller than the calibrated oil port pressure value, the connecting pipeline from the P port of the hydraulic pump to the A port of the hydraulic motor is normal;
detecting the reading of a pressure sensor of an S port of the hydraulic pump and the reading of a pressure sensor of a B port of the hydraulic motor simultaneously in a first detection cycle time, wherein when the reading of the pressure sensor of the S port of the hydraulic pump and the reading of the pressure sensor of the B port of the hydraulic motor are smaller than a calibration value of the oil port pressure, a connecting pipeline from the S port of the hydraulic pump to the B port of the hydraulic motor bursts, and when only one of the reading of the pressure sensor of the S port of the hydraulic pump and the reading of the pressure sensor of the B port of the hydraulic motor is smaller than the calibration value of the oil port pressure, the connecting pipeline from the S port of the hydraulic pump to the B port of the hydraulic motor is normal;
the method comprises the steps that the number of a pressure sensor at an A port of a hydraulic motor and the number of a pressure sensor at a B port of the hydraulic motor are detected simultaneously within a first detection cycle time, when the number of the pressure sensor at the A port of the hydraulic motor and the number of the pressure sensor at the B port of the hydraulic motor are smaller than a calibrated oil port pressure value simultaneously, a pipeline where a closed loop overflow valve is located bursts, and when only one of the number of the pressure sensor at the A port of the hydraulic motor and the number of the pressure sensor at the B port of the hydraulic motor is smaller than the calibrated oil port pressure value, the pipeline where the closed loop overflow valve is located is normal.
Further, the pipe burst detection method for the hydraulic motor durability test further comprises the following steps:
detecting the readings of the hydraulic motor shell outlet flow sensor and the readings of the hydraulic motor shell outlet pressure sensor simultaneously within a second detection cycle time, wherein when the readings of the hydraulic motor shell outlet flow sensor and the readings of the hydraulic motor shell outlet pressure sensor are simultaneously equal to zero, the hydraulic motor shell outlet pipeline bursts, and when only one of the readings of the hydraulic motor shell outlet flow sensor and the readings of the hydraulic motor shell outlet pressure sensor is equal to zero, the hydraulic pipeline is normal;
and detecting the readings of the hydraulic motor shell inlet flow sensor and the readings of the hydraulic motor shell inlet pressure sensor simultaneously within a second detection cycle time, wherein when the readings of the hydraulic motor shell inlet flow sensor and the readings of the hydraulic motor shell inlet pressure sensor are simultaneously equal to zero, the hydraulic motor shell oil inlet pipeline bursts, and when only one of the readings of the hydraulic motor shell inlet flow sensor and the readings of the hydraulic motor shell inlet pressure sensor is equal to zero, the hydraulic pipeline is normal.
Further, according to the pipe bursting detection method for the hydraulic motor durability test, the first detection cycle time is 14s, and the second detection cycle time is 2 s.
Further, according to the method for detecting tube bursting for the hydraulic motor durability test, the oil port has a nominal pressure of 10 bar.
By using the pipe burst detection system and the detection method for the hydraulic motor endurance test, the double sensors are adopted to simultaneously detect the pipeline, so that the failure of the detection result caused by the error of the sensors is avoided, the pipe burst detection accuracy is improved, the reaction is rapid, and the economic loss and the production delay caused by the pipe burst phenomenon are reduced.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of a hydraulic system according to an embodiment of the present invention;
fig. 2 is a flow chart of a method for detecting a burst using the embodiment of fig. 1.
The reference symbols in the drawings denote the following:
10: a hydraulic pump;
20: a hydraulic motor;
30: an engine;
41: hydraulic pump P port pressure sensor, 42: a pressure sensor of an S port of the hydraulic pump;
51: hydraulic motor port a pressure sensor, 52: a pressure sensor of a port B of the hydraulic motor;
61: hydraulic motor housing outlet flow sensor, 62: a hydraulic motor housing outlet pressure sensor;
71: hydraulic motor housing inlet flow sensor, 72: a hydraulic motor housing inlet pressure sensor;
81: relief valve, 82: filter, 83: cooler, 84: first check valve, 85: second check valve, 86: third check valve, 87: a fourth check valve;
l1: a pipeline is connected from the port P of the hydraulic pump to the port A of the hydraulic motor;
l2: a pipeline is connected from the S port of the hydraulic pump to the B port of the hydraulic motor;
l3: an oil outlet pipeline of the hydraulic motor shell;
l4: an oil inlet pipeline of a hydraulic motor shell;
l5: the closed loop overflow valve is located in the pipeline.
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.
FIG. 1 is a schematic diagram of a hydraulic system according to an embodiment of the present invention. As shown in fig. 1, the pipe burst detection system for the hydraulic motor durability test in the present embodiment includes a hydraulic pump 10 and a hydraulic motor 20 constituting a hydraulic system circuit. A closed loop provided with an overflow valve 81 is connected between the hydraulic pump 10 and the hydraulic motor 20, and the overflow valve 81 can directly guide the excess oil amount of the oil inlet pipeline of the hydraulic motor 20 to the oil return pipeline of the hydraulic motor 20 through the closed loop. A P port pressure sensor 41 of the hydraulic pump is arranged at the P port of the hydraulic pump 10, an S port pressure sensor 42 of the hydraulic pump is arranged at the S port of the hydraulic pump, an a port pressure sensor 51 of the hydraulic motor is arranged at the a port of the hydraulic motor 20, and a B port pressure sensor 52 of the hydraulic motor is arranged at the B port of the hydraulic motor. The hydraulic pump P port pressure sensor 41 and the hydraulic motor A port pressure sensor 51 are used for jointly detecting a connecting pipeline L1 from the hydraulic pump P port to the hydraulic motor A port, the hydraulic pump S port pressure sensor 42 and the hydraulic motor B port pressure sensor 52 are used for jointly detecting a connecting pipeline L2 from the hydraulic pump S port to the hydraulic motor B port, and the hydraulic motor A port pressure sensor 51 and the hydraulic motor B port pressure sensor 52 are used for jointly detecting a pipeline L5 where the closed-loop overflow valve is located.
In the present embodiment, the hydraulic pump 10 is a bidirectional variable hydraulic pump, and the hydraulic motor 20 is a bidirectional constant hydraulic motor. The hydraulic pump 10 is driven by the engine 30 and can drive the hydraulic motor 20 to rotate bidirectionally, thereby improving the diversity detection of the hydraulic motor 20. The technical scheme in the embodiment is mainly used for the endurance test of the hydraulic motor, and the sensor is installed on the test bed, so that the cost is not increased, external equipment is not needed, and the detection cost is reduced. In the detection process, the system detects the two sensors as judgment standards, and even if one sensor is damaged, the other sensor can be used for detecting whether the hydraulic pipeline is burst or not. Therefore, the error shutdown caused by unilateral damage of the sensor is eliminated, the accuracy of system shutdown is improved, and the production efficiency is improved.
When the detection results of the hydraulic pump port P pressure sensor 41 and the hydraulic motor port a pressure sensor 51 are abnormal at the same time, it indicates that the connection line L1 from the hydraulic pump port P to the hydraulic motor port a bursts. When only one of the detection results of the hydraulic pump port P pressure sensor 41 and the hydraulic motor port A pressure sensor 51 is abnormal, and the indication of the other sensor is normal, the normal work of the hydraulic pump port P to hydraulic motor port A connecting pipeline L1 is indicated, only the sensor with the abnormal indication is damaged, the sensor needs to be replaced in time, and the downtime in the test process is reduced.
Similarly, when the readings of the hydraulic pump S port pressure sensor 42 and the hydraulic motor B port pressure sensor 52 are abnormal, it indicates that the connection line L2 from the hydraulic pump S port to the hydraulic motor B port is burst.
When the readings of the hydraulic motor a port pressure sensor 51 and the hydraulic motor B port pressure sensor 52 are both abnormal, this indicates that the pipe L5 in which the closed circuit relief valve is located has burst.
Further, the technical solution in this embodiment further includes a hydraulic motor housing outlet flow sensor 61 and a hydraulic motor housing outlet pressure sensor 62. The hydraulic motor housing outlet flow sensor 61 and the hydraulic motor housing outlet pressure sensor 62 are both disposed on the hydraulic motor housing outlet line L3, and are used to jointly detect whether the hydraulic motor housing outlet line L3 bursts.
When the readings of the hydraulic motor housing outlet flow sensor 61 and the hydraulic motor housing outlet pressure sensor 62 are abnormal, the hydraulic motor housing outlet pipeline L3 is burst, and if only one of the readings of the sensors is abnormal, the pipeline is normally operated.
Further, the technical solution in this embodiment further includes a hydraulic motor housing inlet flow sensor 71 and a hydraulic motor housing inlet pressure sensor 72. The hydraulic motor housing inlet flow sensor 71 and the hydraulic motor housing inlet pressure sensor 72 are both disposed on the hydraulic motor housing oil inlet pipeline L4, and are used to jointly detect whether the hydraulic motor housing oil outlet pipeline L4 bursts. .
When the readings of the hydraulic motor shell inlet flow sensor 71 and the hydraulic motor shell inlet pressure sensor 72 are abnormal, the hydraulic motor shell inlet pipeline L4 is burst, and if the reading of only one sensor is abnormal, the pipeline runs normally.
These sensors are already located on the hydraulic motor test stand and therefore do not add to the cost of the detection system. And for the occasions with less sensors, the proper sensors can be selected for detection according to the characteristics of the actual working conditions.
In this embodiment, the closed circuit includes a first check valve 84, a second check valve 85, a third check valve 86, and a fourth check valve 87. The first check valve 84 is provided between the port P of the hydraulic pump 10 and the relief valve 81, the first check valve 84 is connected so that hydraulic oil can be introduced from the port P of the hydraulic pump 10 to the relief valve 84, the second check valve 85 is provided between the port S of the hydraulic pump 10 and the relief valve 81, the second check valve 85 is connected so that hydraulic oil can be introduced from the port S of the hydraulic pump 10 to the relief valve 81, the third check valve 86 is provided between the port B of the hydraulic motor 20 and the relief valve 81, the third check valve 86 is connected so that a return line for introducing hydraulic oil from the relief valve 81 to the port B of the hydraulic motor 20, the fourth check valve 87 is provided between the port a of the hydraulic motor 20 and the relief valve 81, and the fourth check valve 87 is connected so that hydraulic oil can be introduced from the relief valve 81 to the port a of the hydraulic motor 20.
For example, when the port P of the hydraulic pump 10 is a hydraulic pump outlet and the port a of the hydraulic motor 20 is a motor inlet, if the connection line L1 from the port P of the hydraulic pump 10 to the port a of the hydraulic motor has no bursting phenomenon, the hydraulic oil can flow into the port a of the hydraulic motor 20 from the port P of the hydraulic pump 10, wherein the hydraulic oil with a pressure higher than the set pressure of the relief valve 81 flows back to the port S of the hydraulic pump 10 through the first check valve 84, the relief valve 81 and the third check valve 86. Since the hydraulic oil from the port P of the hydraulic pump 10 drives the hydraulic motor 20 to operate, a connecting pipeline L1 from the port P of the hydraulic pump to the port a of the hydraulic motor has a certain pressure, and both the pressure sensor 41 at the port P of the hydraulic pump and the pressure sensor 51 at the port a of the hydraulic motor have fixed readings, which are generally 20 to 450 bar. When the pipe burst occurs in the connection line L1 from the port P of the hydraulic pump to the port a of the hydraulic motor, the pressure on the line suddenly drops due to the leakage of hydraulic oil, so the readings of the pressure sensor 41 at the port P of the hydraulic pump and the pressure sensor 51 at the port a of the hydraulic motor are reduced. The occurrence of a pipe burst can be indicated only when the readings of the pressure sensor 41 at the port P of the hydraulic pump and the pressure sensor 51 at the port a of the hydraulic motor are both smaller than the set values. If the reading of only one sensor is abnormal, the sensor is damaged, and the connecting pipeline cannot be burst.
Further, in order to prevent the impurities in the oil from blocking the check valve in the closed circuit, a filter 82 is further arranged on a pipeline L5 where the closed circuit overflow valve is located. The purpose of the chiller 83 is to cool the oil in the system. The filter 82 and the cooler 83 are connected in series to the oil return line of the relief valve 81 in this order.
Fig. 2 is a flow chart of a method for detecting a burst using the embodiment of fig. 1. As shown in fig. 2, the pipe burst detection using the pipe burst detection system for the hydraulic motor durability test in the present embodiment includes the following steps:
the method comprises the steps that the number of readings of a hydraulic pump P port pressure sensor 41 and the number of readings of a hydraulic motor A port pressure sensor 51 are detected simultaneously in a first detection cycle time, when the number of readings of the hydraulic pump P port pressure sensor 41 and the number of readings of the hydraulic motor A port pressure sensor 51 are smaller than a port pressure calibration value simultaneously, a connecting pipeline L1 from a hydraulic pump P port to a hydraulic motor A port bursts, and when only one of the number of readings of the hydraulic pump P port pressure sensor 41 and the number of readings of the hydraulic motor A port pressure sensor 51 is smaller than the port pressure calibration value, the connecting pipeline L1 from the hydraulic pump P port to the hydraulic motor A port is normal.
The method comprises the steps of simultaneously detecting the number of readings of a pressure sensor 42 of an S port of a hydraulic pump and the number of readings of a pressure sensor 52 of a B port of a hydraulic motor in a first detection cycle time, wherein when the number of readings of the pressure sensor 42 of the S port of the hydraulic pump and the number of readings of the pressure sensor 52 of the B port of the hydraulic motor are simultaneously smaller than a port pressure calibration value, a connecting pipeline L2 from the S port of the hydraulic pump to the B port of the hydraulic motor bursts, and when only one of the number of readings of the pressure sensor 42 of the S port of the hydraulic pump and the number of readings of the pressure sensor 52 of the B port of the hydraulic motor is smaller than the port pressure calibration value, a connecting pipeline L2 from the S.
The method comprises the steps that the number of readings of a hydraulic motor A port pressure sensor 51 and the number of readings of a hydraulic motor B port pressure sensor 52 are detected simultaneously in a first detection cycle time, when the number of readings of the hydraulic motor A port pressure sensor 51 and the number of readings of the hydraulic motor B port pressure sensor 52 are smaller than a port pressure calibration value simultaneously, a pipeline L5 where a closed-loop overflow valve is located bursts, and when only one of the number of readings of the hydraulic motor A port pressure sensor 51 and the number of readings of the hydraulic motor B port pressure sensor 52 is smaller than the port pressure calibration value, a pipeline L5 where the closed-loop overflow valve is located is normal.
Further, the indication number of the hydraulic motor housing outlet flow sensor 61 and the indication number of the hydraulic motor housing outlet pressure sensor 62 are detected simultaneously within the second detection cycle time, when the indication number of the hydraulic motor housing outlet flow sensor 61 and the indication number of the hydraulic motor housing outlet pressure sensor 62 are simultaneously equal to zero, L3 burst occurs in the hydraulic motor housing outlet pipeline, and when only one of the indication number of the hydraulic motor housing outlet flow sensor 61 and the indication number of the hydraulic motor housing outlet pressure sensor 62 is equal to zero, the hydraulic pipeline is normal.
And simultaneously detecting the readings of the hydraulic motor shell inlet flow sensor 71 and the readings of the hydraulic motor shell inlet pressure sensor 72 in the second detection cycle time, wherein when the readings of the hydraulic motor shell inlet flow sensor 71 and the readings of the hydraulic motor shell inlet pressure sensor 72 are simultaneously equal to zero, the hydraulic motor shell oil inlet pipeline L4 bursts, and when only one of the readings of the hydraulic motor shell inlet flow sensor 71 and the readings of the hydraulic motor shell inlet pressure sensor 72 is equal to zero, the hydraulic pipeline is normal.
In this embodiment, the first detection cycle time is 14s, and the second detection cycle time is 2 s. The oil port calibration pressure is 10 bar. The detection period is short, so that the shutdown response time when the pipeline bursts is shortened, the equipment is protected, and the loss of oil is avoided.
When the port P of the hydraulic pump 10 is a hydraulic pump oil outlet and the port A of the hydraulic motor 20 is a hydraulic motor oil inlet, the pressure sensor 41 at the port P of the hydraulic pump and the pressure sensor 51 at the port A of the hydraulic motor are simultaneously detected, if the readings of the port P of the hydraulic pump and the port A of the hydraulic motor are simultaneously lower than 10bar within 14s, the connecting pipeline L1 from the port P of the hydraulic pump to the port A of the hydraulic motor is burst, at the moment, the machine needs to be stopped immediately, and the hydraulic pipeline needs to be repaired. When the reading of the pressure sensor 51 at the port A of the hydraulic motor is less than 10bar, and the reading of the pressure sensor 41 at the port P of the hydraulic pump is more than 10bar, the pressure sensor 51 at the port A of the hydraulic motor is damaged, the machine does not need to be stopped, and only the pressure sensor 51 at the port A of the hydraulic motor needs to be replaced. Similarly, whether the connection line L2 from the port S of the hydraulic pump to the port B of the hydraulic motor bursts or not can be determined by the readings of the pressure sensor 42 of the port S of the hydraulic pump and the pressure sensor 52 of the port B of the hydraulic motor.
And simultaneously detecting the indication number of the hydraulic motor shell outlet flow sensor 61 and the indication number of the hydraulic motor shell outlet pressure sensor 62, and if the indication number of the hydraulic motor shell outlet flow sensor 61 is 0 and the indication number of the hydraulic motor shell outlet pressure sensor 62 is 0 in the second detection cycle time 2s, judging that the hydraulic motor shell oil outlet pipeline L3 bursts and stopping the system. If the reading of the hydraulic motor housing outlet flow sensor 61 is 0 and the reading of the hydraulic motor housing outlet pressure sensor 62 is not 0, it is an indication that the hydraulic motor housing outlet flow sensor 61 has been damaged and the system does not need to be shut down. In the same way, whether the oil inlet pipeline L4 of the hydraulic motor shell bursts or not can be judged.
And simultaneously detecting the readings of the pressure sensor 51 at the port A of the hydraulic motor and the readings of the pressure sensor 52 at the port B of the hydraulic motor, and if the readings of the pressure sensor 51 at the port A of the hydraulic motor and the readings of the pressure sensor 52 at the port B of the hydraulic motor are both less than the nominal pressure of 10bar within the first detection cycle time 14s, judging that a pipeline L5 where the closed-loop overflow valve is located bursts and stopping the system.
By using the pipe burst detection system and the detection method for the hydraulic motor endurance test, the double sensors are adopted to simultaneously detect the pipeline, so that the failure of the detection result caused by the error of the sensors is avoided, the pipe burst detection accuracy is improved, the reaction is rapid, and the economic loss and the production delay caused by the pipe burst phenomenon are reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A pipe burst detection system for a hydraulic motor endurance test is characterized by comprising a hydraulic pump and a hydraulic motor which form a hydraulic system loop, wherein a closed loop provided with an overflow valve is connected between the hydraulic pump and the hydraulic motor, the overflow valve can directly guide the redundant oil mass of an oil inlet pipeline of the hydraulic motor into an oil return pipeline of the hydraulic motor through the closed loop, a P port of the hydraulic pump is provided with a P port pressure sensor of the hydraulic pump, an S port of the hydraulic pump is provided with an S port pressure sensor of the hydraulic pump, an A port of the hydraulic motor is provided with an A port pressure sensor of the hydraulic motor, a B port of the hydraulic motor is provided with a B port pressure sensor of the hydraulic motor, the P port pressure sensor of the hydraulic pump and the A port pressure sensor of the hydraulic motor are used for jointly detecting a connecting pipeline from the P port of the hydraulic pump to the A port of the hydraulic motor, the hydraulic pump S port pressure sensor and the hydraulic motor B port pressure sensor are used for jointly detecting a connecting pipeline from the hydraulic pump S port to the hydraulic motor B port, the hydraulic motor A port pressure sensor and the hydraulic motor B port pressure sensor are used for jointly detecting a pipeline where a closed loop overflow valve is located, the pipe bursting detection system also comprises a hydraulic motor shell outlet flow sensor and a hydraulic motor shell outlet pressure sensor, the hydraulic motor shell outlet flow sensor and the hydraulic motor shell outlet pressure sensor are both arranged on an oil outlet pipeline of the hydraulic motor shell, the pipe bursting detection system also comprises a hydraulic motor shell inlet flow sensor and a hydraulic motor shell inlet pressure sensor, the hydraulic motor shell inlet flow sensor and the hydraulic motor shell inlet pressure sensor are arranged on an oil inlet pipeline of the hydraulic motor shell.
2. The pipe burst detection system for the hydraulic motor durability test according to claim 1, wherein the hydraulic pump is a bidirectional variable hydraulic pump, and the hydraulic motor is a bidirectional fixed-displacement hydraulic motor.
3. The pipe burst detection system for the endurance test of the hydraulic motor according to claim 1, wherein the closed circuit further includes a first check valve, a second check valve, a third check valve, and a fourth check valve, the first check valve is disposed between the port P of the hydraulic pump and the overflow valve, and the conduction of the first check valve enables hydraulic oil to be introduced from the port P of the hydraulic pump to the overflow valve, the second check valve is disposed between the port S of the hydraulic pump and the overflow valve, and the conduction of the second check valve enables hydraulic oil to be introduced from the port S of the hydraulic pump to the overflow valve, the third check valve is disposed between the port B of the hydraulic motor and the overflow valve, and the conduction of the third check valve enables hydraulic oil to be introduced from the overflow valve to the return line of the port B of the hydraulic motor, the fourth check valve is arranged between the port A of the hydraulic motor and the overflow valve, and the conduction of the fourth check valve can lead hydraulic oil into an oil return pipeline of the port A of the hydraulic motor from the overflow valve.
4. The pipe burst detection system for the hydraulic motor durability test according to claim 3, wherein a filter and a cooler are further arranged on a pipeline where the closed-loop overflow valve is located, and the filter and the cooler are sequentially connected in series on an oil return pipeline of the overflow valve.
5. A pipe burst detection method for a hydraulic motor durability test is used for detecting by using the pipe burst detection system for the hydraulic motor durability test of any one of the claims 1 to 4, and is characterized by comprising the following steps:
detecting the readings of a pressure sensor at a P port of the hydraulic pump and the readings of a pressure sensor at an A port of the hydraulic motor simultaneously within a first detection cycle time, wherein when the readings of the pressure sensor at the P port of the hydraulic pump and the readings of the pressure sensor at the A port of the hydraulic motor are smaller than a calibrated oil port pressure value simultaneously, a connecting pipeline from the P port of the hydraulic pump to the A port of the hydraulic motor bursts, and when only one of the readings of the pressure sensor at the P port of the hydraulic pump and the readings of the pressure sensor at the A port of the hydraulic motor is smaller than the calibrated oil port pressure value, the connecting pipeline from the P port of the hydraulic pump to the A port of the hydraulic motor is normal;
detecting the reading of a pressure sensor of an S port of the hydraulic pump and the reading of a pressure sensor of a B port of the hydraulic motor simultaneously in a first detection cycle time, wherein when the reading of the pressure sensor of the S port of the hydraulic pump and the reading of the pressure sensor of the B port of the hydraulic motor are smaller than a calibration value of the oil port pressure, a connecting pipeline from the S port of the hydraulic pump to the B port of the hydraulic motor bursts, and when only one of the reading of the pressure sensor of the S port of the hydraulic pump and the reading of the pressure sensor of the B port of the hydraulic motor is smaller than the calibration value of the oil port pressure, the connecting pipeline from the S port of the hydraulic pump to the B port of the hydraulic motor is normal;
the method comprises the steps that the number of a pressure sensor at an A port of a hydraulic motor and the number of a pressure sensor at a B port of the hydraulic motor are detected simultaneously within a first detection cycle time, when the number of the pressure sensor at the A port of the hydraulic motor and the number of the pressure sensor at the B port of the hydraulic motor are smaller than a calibrated oil port pressure value simultaneously, a pipeline where a closed loop overflow valve is located bursts, and when only one of the number of the pressure sensor at the A port of the hydraulic motor and the number of the pressure sensor at the B port of the hydraulic motor is smaller than the calibrated oil port pressure value, the pipeline where the closed loop overflow valve is located is normal.
6. The pipe bursting detection method for the hydraulic motor durability test according to claim 5, further comprising the steps of:
detecting the readings of the hydraulic motor shell outlet flow sensor and the readings of the hydraulic motor shell outlet pressure sensor simultaneously within a second detection cycle time, wherein when the readings of the hydraulic motor shell outlet flow sensor and the readings of the hydraulic motor shell outlet pressure sensor are simultaneously equal to zero, the hydraulic motor shell outlet pipeline bursts, and when only one of the readings of the hydraulic motor shell outlet flow sensor and the readings of the hydraulic motor shell outlet pressure sensor is equal to zero, the hydraulic pipeline is normal;
and detecting the readings of the hydraulic motor shell inlet flow sensor and the readings of the hydraulic motor shell inlet pressure sensor simultaneously within a second detection cycle time, wherein when the readings of the hydraulic motor shell inlet flow sensor and the readings of the hydraulic motor shell inlet pressure sensor are simultaneously equal to zero, the hydraulic motor shell oil inlet pipeline bursts, and when only one of the readings of the hydraulic motor shell inlet flow sensor and the readings of the hydraulic motor shell inlet pressure sensor is equal to zero, the hydraulic pipeline is normal.
7. The method for detecting a pipe burst for a hydraulic motor durability test according to claim 6, wherein the first detection cycle time is 14s and the second detection cycle time is 2 s.
8. The method of claim 5, wherein the port pressure calibration is 10 bar.
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| CN111396402A (en) * | 2020-03-26 | 2020-07-10 | 徐州徐工环境技术有限公司 | Hydraulic protection system of dust suppression vehicle and control method thereof |
| CN111706576B (en) * | 2020-06-22 | 2022-07-19 | 潍柴动力股份有限公司 | Durability detection system and detection method thereof |
| CN112727854B (en) * | 2020-12-25 | 2023-05-26 | 湖南中铁五新重工有限公司 | Oil injection device and hydraulic system are prevented to hydraulic pressure oil pipe explosion |
| CN114109961B (en) * | 2021-11-12 | 2023-04-25 | 恒天九五重工有限公司 | Calibration method for motor variable starting point of power head of rotary drilling rig |
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Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee after: WEICHAI POWER Co.,Ltd. Patentee after: Weichai Hydraulic Transmission Co.,Ltd. Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: WEICHAI POWER Co.,Ltd. Patentee before: LINDE HYDRAULICS (CHINA) Co.,Ltd. |