CN117759607B - Method and system for measuring flow characteristics of liquid filling and discharging of energy accumulator - Google Patents
Method and system for measuring flow characteristics of liquid filling and discharging of energy accumulator Download PDFInfo
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Abstract
The invention discloses a method and a system for measuring flow characteristics of liquid filling and discharging of an energy accumulator, wherein the method comprises a hydraulic transmission system, the hydraulic transmission system comprises a hydraulic pump and a liquid filling valve, an inlet of the hydraulic pump is connected with an oil tank, an outlet of the hydraulic pump is connected with an inlet of a flow sensor, an outlet of the flow sensor is connected with a P port of the liquid filling valve, and an A port of the liquid filling valve is connected with an inlet of the energy accumulator; the drive shaft of the hydraulic pump is connected with the output shaft of the motor. The method and the system can accurately measure the flow characteristics of the liquid filling and discharging of the energy accumulator under the condition of the actual working pressure of the hydraulic system, thereby evaluating the flow characteristics of the liquid filling and discharging of the energy accumulator, providing guidance for the parameter matching of the hydraulic transmission system, the parameter setting of the energy accumulator and the like, optimizing the dynamic characteristics of the hydraulic transmission system, improving the efficiency of the hydraulic transmission system and prolonging the service life of the hydraulic system.
Description
Technical Field
The invention relates to the field of accumulator characteristic measurement, in particular to a method and a system for measuring the flow characteristics of liquid filling and discharging of an accumulator.
Background
In the hydraulic system of metallurgical machinery, steel equipment, hydraulic pile hammer, forging machinery, test equipment, mining machinery and other equipment, an accumulator is often used as an auxiliary power source to supply oil to the hydraulic system together with a hydraulic pump station, so that the short-time peak high-flow requirement in the working process of the hydraulic system is met, the energy is saved, the cost for manufacturing the high-flow hydraulic pump station is reduced, and the transmission efficiency of the hydraulic system is improved.
The hydraulic system adopting the energy accumulator as the auxiliary power source can possibly cause the reduction of the working performance and the transmission efficiency of the hydraulic system and even can not work normally if the flow characteristics of liquid filling and discharging can not meet the index requirements; therefore, in order to ensure the working performance of the hydraulic system, reasonably match the parameters of the hydraulic system, optimize the dynamic characteristics of the hydraulic system and improve the transmission efficiency, the liquid charging and discharging flow characteristics of the accumulator are required to be measured.
The utility model discloses a low pressure accumulator P-V characteristic measurement system and a test method, which is disclosed in the publication No. CN112729870A, although the pressure source, the test module and the displacement sensor, the test module comprises a pressure increasing valve, a pressure reducing valve and a low pressure accumulator, the two ends of the pressure reducing valve are connected with the pressure increasing valve and the low pressure accumulator, the pressure source is connected with one end of the pressure increasing valve, a one-way valve is arranged on the pipelines at the two ends of the pressure increasing valve, the other end of the pressure increasing valve is connected with the pressure reducing valve, the pressure reducing valve is connected with the low pressure accumulator, the displacement sensor is arranged at the rear end of the low pressure accumulator, for the hydraulic system adopting the high pressure accumulator and the large volume accumulator as auxiliary power sources, the instantaneous flow rate of the accumulator in the liquid charging process can reach thousands of liters per minute, and the instantaneous flow rate in the liquid discharging process can reach thousands of liters per minute, therefore, the measurement of the instantaneous flow rate characteristics of the accumulator in the liquid charging and discharging process is very difficult; therefore, in engineering application, the flow characteristics of the accumulator charging and discharging process are usually obtained through mathematical modeling, theoretical analysis and computer simulation of a hydraulic system, but because the model parameters of the hydraulic system are inaccurate or influence factors are ignored in modeling, larger errors exist between the theoretically calculated accumulator charging and discharging flow characteristics and the charging and discharging flow characteristics under the actual working pressure condition of the hydraulic system, and therefore, the accumulator charging and discharging flow characteristic measuring method and system are provided.
Disclosure of Invention
The invention aims to provide a method and a system for measuring the flow characteristics of accumulator charging and discharging, which can accurately measure the flow characteristics of accumulator charging and discharging under the condition of actual working pressure of a hydraulic system, thereby evaluating the flow characteristics of accumulator charging and discharging, providing guidance for parameter matching of the hydraulic transmission system, parameter setting of the accumulator and the like, optimizing the dynamic characteristics of the hydraulic transmission system, improving the efficiency of the hydraulic transmission system and prolonging the service life of the hydraulic system.
In order to achieve the above purpose, the present invention provides the following technical solutions:
in a first aspect, the invention provides a system for measuring the flow characteristics of liquid filling and discharging of an accumulator, which comprises a hydraulic transmission system, wherein the hydraulic transmission system comprises a hydraulic pump and a liquid filling valve, an inlet of the hydraulic pump is connected with an oil tank, an outlet of the hydraulic pump is connected with an inlet of a flow sensor, an outlet of the flow sensor is connected with a P port of the liquid filling valve, and an A port of the liquid filling valve is connected with an inlet of the accumulator; an inlet of a safety valve for safely protecting the working pressure of the hydraulic pump is connected between an outlet of the hydraulic pump and an inlet of the flow sensor, and an outlet of the safety valve is connected with an oil tank; an opening A of a liquid discharge valve is connected between an opening A of the liquid filling valve and an inlet of the energy accumulator, an opening P of the liquid discharge valve is connected with an inlet of a loading overflow valve, and an outlet of the loading overflow valve is connected with an opening A of the weighing volume box; an A port of a bypass valve is connected between an A port of the charging valve and an inlet of the accumulator, and a P port of the bypass valve is connected with the oil tank.
Preferably, the port B of the weighing volume box is connected with the port A of the oil discharging valve, the port P of the oil discharging valve is connected with the oil tank, and the inlet of the pressure gauge is connected between the outlet of the hydraulic pump and the inlet of the flow sensor.
Preferably, the flow sensor is used to measure the flow of liquid during charging of the accumulator.
Preferably, a pressure sensor is connected between the port A of the charging valve and the inlet of the accumulator.
Preferably, the load cell is located at the bottom of the weigh volume tank.
Preferably, the loading overflow valve is provided with a pressure regulating spring for regulating working pressure.
Preferably, the drive shaft of the hydraulic pump is connected to the output shaft of a motor for driving the hydraulic pump to rotate.
Preferably, the automatic control device further comprises a controller, wherein control signals output by the controller are used for controlling the electrifying and the outage of the charging valve, the discharging valve, the oil discharging valve and the bypass valve.
Preferably, the controller collects signals of the flow sensor, the controller collects signals of the pressure sensor, the controller collects signals of the weighing sensor, the controller calculates flow of the accumulator in the process of filling liquid, and the controller calculates flow of the accumulator in the process of discharging liquid.
In a second aspect, the present invention provides a method for using an accumulator charge, discharge flow characteristic measurement system as described above, the specific method of operation comprising:
step one, inflating the energy accumulator, and stopping inflating the energy accumulator when the inflation pressure of the energy accumulator reaches an inflation pressure set value p 0;
step two, the controller outputs zero voltage signals to electromagnets of the liquid filling valve, the liquid discharging valve, the oil discharging valve and the bypass valve, the electromagnets of the liquid filling valve, the liquid discharging valve, the oil discharging valve and the bypass valve are powered off, and the liquid filling valve, the liquid discharging valve, the oil discharging valve and the bypass valve work at the right position and are not in a passage at the moment;
Step three, the safety valve is completely opened, the hydraulic pump is started, the pressure regulating spring of the safety valve is regulated to gradually increase the working pressure of the hydraulic pump to the set value of the safety valve, and the set value of the safety valve is 10% greater than the highest working pressure of the accumulator;
step four, adjusting a pressure regulating spring of the loading overflow valve, wherein the pressure regulating spring is completely opened;
Fifthly, the controller outputs control voltage signals to electromagnets of the liquid filling valve, the liquid discharging valve and the oil discharging valve, the liquid filling valve, the liquid discharging valve and the electromagnet of the oil discharging valve are electrified, the liquid filling valve, the liquid discharging valve and the oil discharging valve work at left positions, and the working pressure of the hydraulic pump is gradually reduced to atmospheric pressure;
step six, adjusting a pressure regulating spring for loading the overflow valve to gradually increase the working pressure of the hydraulic pump to a lowest working pressure value p 1 in the discharging process of the accumulator;
Step seven, the controller outputs zero voltage signals to electromagnets of the liquid filling valve and the liquid discharging valve, the electromagnets of the liquid filling valve and the liquid discharging valve are powered off, and the liquid filling valve and the liquid discharging valve work at the right position;
Step eight, the controller outputs a control voltage signal to an electromagnet of the bypass valve, the electromagnet of the bypass valve is electrified, the bypass valve works at the left position, and at the moment, all oil in the accumulator flows back to the oil tank 1 through the bypass valve; the controller outputs a zero-voltage signal to the electromagnet of the bypass valve, the electromagnet of the bypass valve is powered off, and the bypass valve works at the right position;
Step nine, when all oil liquid contained in the weighing volume box flows back to the oil box through the oil discharging valve, the controller outputs a zero-voltage signal to an electromagnet of the oil discharging valve, the electromagnet of the oil discharging valve is powered off, and the oil discharging valve works at the right position;
Tenth, the controller outputs a control voltage signal to an electromagnet of the liquid filling valve, the electromagnet of the liquid filling valve is electrified, and the liquid filling valve works at the left position; sampling time T, T is the frequency of collecting the pressure sensor and the flow sensor, and the controller continuously collects the signal q 11 of the flow sensor and the signal p 11 of the pressure sensor; when the pressure p 11 of the pressure sensor reaches the highest working pressure value p 2 of the energy accumulator, the controller stops collecting signals of the flow sensor and the pressure sensor; the controller outputs a zero-voltage signal to an electromagnet of the liquid filling valve, the electromagnet of the liquid filling valve is powered off, and the liquid filling valve works at the right position;
Step eleven, the controller draws a characteristic curve of the change of the liquid filling flow along with time and a curve of the change of the liquid filling process pressure along with time according to the collected signal q 11 of the flow sensor and the signal p 11 of the pressure sensor;
Step twelve, the controller outputs a voltage signal to an electromagnet of the liquid discharge valve, the electromagnet of the liquid discharge valve is electrified, and the liquid discharge valve works at the left position; t 1 sampling time, the controller reads the signal p 21 of the pressure sensor and the signal G 21 of the weighing sensor; at the next consecutive sampling time of T 2, the controller reads the signal p 22 of the pressure sensor and the signal G 22 of the weighing sensor;
thirteenth, the weighing signal G 21、G22 is used to calculate the volume signal V 21、V22 of the liquid in the controller
Wherein ρ is the density of the liquid and g is the gravitational acceleration;
Fourteen, subtracting the volume signal V 22 from the volume signal V 21 to obtain a volume variation V 22-V21, dividing the volume variation V 22-V21 by a sampling period T to obtain a flow q 22 of the liquid discharge at the sampling time of T 2;
fifteen, when the pressure of the pressure sensor is reduced to a lowest working pressure value p 1 of the energy accumulator, the controller stops collecting signals of the weighing sensor and the pressure sensor; the controller outputs a zero-voltage signal to an electromagnet of the liquid discharge valve, the electromagnet of the liquid discharge valve is powered off, and the liquid discharge valve works at the right position;
Sixteenth, the controller draws a characteristic curve of the discharge flow rate changing along with time and a curve of the discharge process pressure changing along with time according to the flow rate q 22 obtained by calculation of each continuous sampling time and the signal p 22 of the pressure sensor.
The invention has the technical effects and advantages that:
(1) By utilizing the cooperation of the pressure sensor, the flow sensor, the weighing sensor and the pressure gauge thereof, the flow characteristics of the liquid filling and discharging of the energy accumulator can be measured more accurately, so that the flow performance of the liquid filling and discharging of the energy accumulator in the working process of an actual hydraulic system is evaluated;
(2) By providing guidance for hydraulic transmission system parameter matching, accumulator parameter setting and the like, the dynamic characteristics of the hydraulic transmission system can be optimized, the efficiency of the hydraulic transmission system can be improved, and the service life of the hydraulic system can be prolonged.
Drawings
FIG. 1 is a schematic diagram of an accumulator charge and discharge flow characteristic measurement system according to the present invention.
In the figure: 1. an oil tank; 2. a hydraulic pump; 3. a motor; 4. a safety valve; 5. a flow sensor; 6. a charging valve; 7. a pressure sensor; 8. a controller; 9. an accumulator; 10. a drain valve; 11. loading an overflow valve; 12. a weighing volume box; 13. a weighing sensor; 14. an oil discharge valve; 15. a pressure gauge; 16. and a bypass valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a liquid filling and discharging flow characteristic measuring system of an energy accumulator as shown in figure 1, which comprises a hydraulic transmission system, wherein the hydraulic transmission system comprises a hydraulic pump 2 and a liquid filling valve 6, the inlet of the hydraulic pump 2 is connected with an oil tank 1, the outlet of the hydraulic pump 2 is connected with the inlet of a flow sensor 5, the outlet of the flow sensor 5 is connected with the P port of the liquid filling valve 6, and the A port of the liquid filling valve 6 is connected with the inlet of an energy accumulator 9; the driving shaft of the hydraulic pump 2 is connected with the output shaft of the motor 3; an inlet of a safety valve 4 for safely protecting the working pressure of the hydraulic pump 2 is connected between an outlet of the hydraulic pump 2 and an inlet of a flow sensor 5, and an outlet of the safety valve 4 is connected with an oil tank 1; an A port of a liquid discharge valve 10 is connected between an A port of the liquid filling valve 6 and an inlet of the accumulator 9, a P port of the liquid discharge valve 10 is connected with an inlet of a loading overflow valve 11, an outlet of the loading overflow valve 11 is connected with an A port of a weighing volume box 12, a B port of the weighing volume box 12 is connected with an A port of an oil discharge valve 14, and a P port of the oil discharge valve 14 is connected with the oil tank 1; an A port of a bypass valve 16 is connected between an A port of the charging valve 6 and an inlet of the accumulator 9, and a P port of the bypass valve 16 is connected with the oil tank 1.
Further, an inlet of a pressure gauge 15 is connected between the outlet of the hydraulic pump 2 and the inlet of the flow sensor 5, and the pressure gauge 15 is used for monitoring the working pressure of the hydraulic pump 2.
Further, the flow sensor 5 is used to measure the flow of liquid during charging of the accumulator 9.
It should be noted that a pressure sensor 7 is connected between the port a of the charging valve 6 and the inlet of the accumulator 9, and the pressure sensor 7 is used for measuring the pressure of the inlet of the accumulator 9.
It should be noted in particular that the load cell 13 is located at the bottom of the weigh volume tank 12, the load cell 13 being adapted to measure the weight of the oil contained in the weigh volume tank 12.
Further, the relief valve 11 is provided with a pressure regulating spring for regulating the working pressure.
An accumulator charge and discharge flow characteristic measuring system is characterized in that a motor 3 is used for driving a hydraulic pump 2 to rotate.
Further, the automatic control device is characterized by further comprising a controller 8, wherein control signals output by the controller 8 are used for controlling the energization and the outage of the charging valve 6, the discharging valve 10, the oil discharging valve 14 and the bypass valve 16.
Further, the controller 8 collects signals of the flow sensor 5, the controller 8 collects signals of the pressure sensor 7, the controller 8 collects signals of the weighing sensor 13, the controller 8 calculates flow of the accumulator 9 in the charging process, and the controller 8 calculates flow of the accumulator 9 in the discharging process.
The application method of the accumulator liquid filling and discharging flow characteristic measuring system comprises the following specific operation methods:
Step one, inflating the energy accumulator 9, and stopping inflating the energy accumulator 9 when the inflation pressure of the energy accumulator 9 reaches an inflation pressure set value p 0;
Step two, the controller 8 outputs zero voltage signals to electromagnets of the liquid filling valve 6, the liquid discharging valve 10, the oil discharging valve 14 and the bypass valve 16, the electromagnets of the liquid filling valve 6, the liquid discharging valve 10, the oil discharging valve 14 and the bypass valve 16 are powered off, and the liquid filling valve 6, the liquid discharging valve 10, the oil discharging valve 14 and the bypass valve 16 work at the right position and are not in a passage at the moment;
Step three, the safety valve 4 is completely opened, the hydraulic pump 2 is started, the pressure regulating spring of the safety valve 4 is regulated to gradually increase the working pressure of the hydraulic pump 2 to the set value of the safety valve 4, and the set value of the safety valve 4 is 10% greater than the highest working pressure of the accumulator 9;
step four, adjusting a pressure regulating spring of the loading overflow valve 11, wherein the pressure regulating spring is completely opened;
Step five, the controller 8 outputs control voltage signals to electromagnets of the liquid filling valve 6, the liquid discharging valve 10 and the oil discharging valve 14, the electromagnets of the liquid filling valve 6, the liquid discharging valve 10 and the oil discharging valve 14 are electrified, the liquid filling valve 6, the liquid discharging valve 10 and the oil discharging valve 14 work at the left position, and the working pressure of the hydraulic pump 2 is gradually reduced to the atmospheric pressure;
Step six, adjusting a pressure regulating spring of the loading overflow valve 11 to gradually increase the working pressure of the hydraulic pump 2 to a minimum working pressure value p 1 in the discharging process of the accumulator 9;
Step seven, the controller 8 outputs zero voltage signals to electromagnets of the liquid filling valve 6 and the liquid discharging valve 10, the electromagnets of the liquid filling valve 6 and the liquid discharging valve 10 are powered off, and the liquid filling valve 6 and the liquid discharging valve 10 work at the right position;
Step eight, the controller 8 outputs a control voltage signal to the electromagnet of the bypass valve 16, the electromagnet of the bypass valve 16 is electrified, the bypass valve 16 works at the left position, and at the moment, all oil in the accumulator 9 flows back to the oil tank 1 through the bypass valve 16; the controller 8 outputs a zero-voltage signal to the electromagnet of the bypass valve 16, the electromagnet of the bypass valve 16 is powered off, and the bypass valve 16 works at the right position;
step nine, when all oil liquid contained in the weighing volume box 12 flows back to the oil tank 1 through the oil discharging valve 14, the controller 8 outputs a zero-voltage signal to the electromagnet of the oil discharging valve 14, the electromagnet of the oil discharging valve 14 is powered off, and the oil discharging valve 14 works at the right position;
Tenth, the controller 8 outputs a control voltage signal to the electromagnet of the charging valve 6, the electromagnet of the charging valve 6 is electrified, and the charging valve 6 works at the left position; sampling time T, T is the frequency of collecting the pressure sensor 7 and the flow sensor 5, and the controller 8 continuously collects the signal q 11 of the flow sensor 5 and the signal p 11 of the pressure sensor 7; when the pressure p 11 of the pressure sensor 7 reaches the highest working pressure value p 2 of the accumulator 9, the controller 8 stops collecting signals of the flow sensor 5 and the pressure sensor 7; the controller 8 outputs a zero-voltage signal to the electromagnet of the charging valve 6, the electromagnet of the charging valve 6 is powered off, and the charging valve 6 works at the right position;
Step eleven, the controller 8 draws a characteristic curve of the change of the liquid filling flow along with time and a curve of the change of the liquid filling process pressure along with time according to the collected signal q 11 of the flow sensor 5 and the signal p 11 of the pressure sensor 7;
Step twelve, the controller 8 outputs a voltage signal to an electromagnet of the liquid discharge valve 10, the electromagnet of the liquid discharge valve 10 is electrified, and the liquid discharge valve 10 works at the left position; t 1 sampling time, the controller 8 reads the signal p 21 of the pressure sensor 7 and the signal G 21 of the weighing sensor 13; at the next consecutive sampling time T 2, the controller 8 reads the signal p 22 of the pressure sensor 7, the signal G 22 of the load cell 13;
Thirteenth, the weighing signal G 21、G22 is used to calculate the volume signal V 21、V22 of the liquid in the controller 8
Wherein ρ is the density of the liquid and g is the gravitational acceleration;
Fourteen, subtracting the volume signal V 22 from the volume signal V 21 to obtain a volume variation V 22-V21, dividing the volume variation V 22-V21 by a sampling period T to obtain a flow q 22 of the liquid discharge at the sampling time of T 2;
Fifteen, when the pressure of the pressure sensor 7 is reduced to the lowest working pressure value p 1 of the energy accumulator, the controller 8 stops collecting signals of the weighing sensor 13 and the pressure sensor 7; the controller 8 outputs a zero-voltage signal to the electromagnet of the drain valve 10, the electromagnet of the drain valve 10 is powered off, and the drain valve 10 works at the right position;
Sixteenth, the controller 8 draws a characteristic curve of the discharge flow rate changing with time and a curve of the discharge process pressure changing with time according to the flow rate q 22 calculated by each continuous sampling time and the signal p 22 of the pressure sensor 7.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (2)
1. A measuring system for the liquid filling and discharging flow characteristics of an accumulator is characterized by comprising a hydraulic transmission system,
The hydraulic transmission system comprises a hydraulic pump (2) and a liquid filling valve (6), wherein an inlet of the hydraulic pump (2) is connected with an oil tank (1), an outlet of the hydraulic pump (2) is connected with an inlet of a flow sensor (5), an outlet of the flow sensor (5) is connected with a P port of the liquid filling valve (6), and an A port of the liquid filling valve (6) is connected with an inlet of an accumulator (9);
An inlet of a safety valve (4) for safely protecting the working pressure of the hydraulic pump (2) is connected between an outlet of the hydraulic pump (2) and an inlet of a flow sensor (5), and an outlet of the safety valve (4) is connected with an oil tank (1);
an A port of a liquid discharge valve (10) is connected between an A port of the liquid filling valve (6) and an inlet of the energy accumulator (9), a P port of the liquid discharge valve (10) is connected with an inlet of a loading overflow valve (11), and an outlet of the loading overflow valve (11) is connected with an A port of a weighing volume box (12);
An A port of a bypass valve (16) is connected between an A port of the charging valve (6) and an inlet of the accumulator (9), and a P port of the bypass valve (16) is connected with the oil tank (1);
the port B of the weighing volume box (12) is connected with the port A of the oil discharge valve (14), the port P of the oil discharge valve (14) is connected with the oil tank (1), and an inlet of the pressure gauge (15) is connected between an outlet of the hydraulic pump (2) and an inlet of the flow sensor (5);
the flow sensor (5) is used for measuring the flow of liquid in the process of filling the accumulator (9);
a pressure sensor (7) is connected between the port A of the charging valve (6) and the inlet of the accumulator (9);
The weighing sensor (13) is positioned at the bottom of the weighing volume box (12);
the loading overflow valve (11) is provided with a pressure regulating spring for regulating working pressure;
the driving shaft of the hydraulic pump (2) is connected with the output shaft of the motor (3), and the motor (3) is used for driving the hydraulic pump (2) to rotate;
The hydraulic control system further comprises a controller (8), wherein control signals output by the controller (8) are used for controlling the electrification and outage of the liquid filling valve (6), the liquid discharging valve (10), the oil discharging valve (14) and the bypass valve (16);
The controller (8) collects signals of the flow sensor (5), the controller (8) collects signals of the pressure sensor (7), the controller (8) collects signals of the weighing sensor (13), the controller (8) calculates flow of the accumulator (9) in the liquid charging process, and the controller (8) calculates flow of the accumulator (9) in the liquid discharging process.
2. A method of operating an accumulator charge and discharge flow characteristic measurement system according to claim 1, wherein the method is as follows:
Step one, inflating the energy accumulator (9), and stopping inflating the energy accumulator (9) when the inflation pressure of the energy accumulator (9) reaches an inflation pressure set value p 0;
Step two, the controller (8) outputs zero voltage signals to electromagnets of the liquid filling valve (6), the liquid discharging valve (10), the oil discharging valve (14) and the bypass valve (16), the electromagnets of the liquid filling valve (6), the liquid discharging valve (10), the oil discharging valve (14) and the bypass valve (16) are powered off, and the liquid filling valve (6), the liquid discharging valve (10), the oil discharging valve (14) and the bypass valve (16) work at the right position and are not in a passage at the moment;
step three, the safety valve (4) is completely opened, the hydraulic pump (2) is started, the pressure regulating spring of the safety valve (4) is regulated to gradually increase the working pressure of the hydraulic pump (2) to the set value of the safety valve (4), and the set value of the safety valve (4) is 10% greater than the highest working pressure of the accumulator (9);
step four, adjusting a pressure regulating spring of the loading overflow valve (11), wherein the pressure regulating spring is completely opened;
Fifthly, the controller (8) outputs control voltage signals to electromagnets of the liquid filling valve (6), the liquid discharging valve (10) and the oil discharging valve (14), the electromagnets of the liquid filling valve (6), the liquid discharging valve (10) and the oil discharging valve (14) are electrified, the liquid filling valve (6), the liquid discharging valve (10) and the oil discharging valve (14) work at the left position, and the working pressure of the hydraulic pump (2) is gradually reduced to the atmospheric pressure;
Step six, adjusting a pressure regulating spring of a loading overflow valve (11) to gradually increase the working pressure of the hydraulic pump (2) to a lowest working pressure value p 1 in the discharging process of the accumulator (9);
Step seven, the controller (8) outputs zero-voltage signals to electromagnets of the liquid filling valve (6) and the liquid discharging valve (10), the electromagnets of the liquid filling valve (6) and the liquid discharging valve (10) are powered off, and the liquid filling valve (6) and the liquid discharging valve (10) work at the right position;
Step eight, the controller (8) outputs a control voltage signal to an electromagnet of the bypass valve (16), the electromagnet of the bypass valve (16) is electrified, the bypass valve (16) works at the left position, and at the moment, all oil in the accumulator (9) flows back to the oil tank (1) through the bypass valve (16); the controller (8) outputs a zero-voltage signal to the electromagnet of the bypass valve (16), the electromagnet of the bypass valve (16) is powered off, and the bypass valve (16) works at the right position;
Step nine, when all oil liquid contained in the weighing volume tank (12) flows back to the oil tank (1) through the oil discharging valve (14), the controller (8) outputs a zero-voltage signal to the electromagnet of the oil discharging valve (14), the electromagnet of the oil discharging valve (14) is powered off, and the oil discharging valve (14) works at the right position;
tenth, the controller (8) outputs a control voltage signal to the electromagnet of the charging valve (6), the electromagnet of the charging valve (6) is electrified, and the charging valve (6) works at the left position; sampling time T, T is the frequency of collecting the pressure sensor (7) and the flow sensor (5), and the controller (8) continuously collects the signal q 11 of the flow sensor (5) and the signal p 11 of the pressure sensor (7); when the pressure p 11 of the pressure sensor (7) reaches the highest working pressure value p 2 of the accumulator (9), the controller (8) stops collecting signals of the flow sensor (5) and the pressure sensor (7); the controller (8) outputs a zero-voltage signal to the electromagnet of the liquid filling valve (6), the electromagnet of the liquid filling valve (6) is powered off, and the liquid filling valve (6) works at the right position;
Step eleven, the controller (8) draws a characteristic curve of the change of the liquid filling flow along with time and a curve of the change of the liquid filling process pressure along with time according to the collected signal q 11 of the flow sensor (5) and the signal p 11 of the pressure sensor (7);
Twelve, the controller (8) outputs a voltage signal to an electromagnet of the liquid discharging valve (10), the electromagnet of the liquid discharging valve (10) is electrified, and the liquid discharging valve (10) works at the left position; t 1 sampling time, the controller (8) reads the signal p 21 of the pressure sensor (7) and the signal G 21 of the weighing sensor (13); at the next consecutive sampling time of T 2, the controller (8) reads the signal p 22 of the pressure sensor (7) and the signal G 22 of the weighing sensor (13);
Thirteenth, the weighing signal G 21、G22 is used for obtaining a liquid volume signal V 21、V22 signal through the following calculation in the controller (8)
；
Wherein ρ is the density of the liquid and g is the gravitational acceleration;
Fourteen, subtracting the volume signal V 22 from the volume signal V 21 to obtain a volume variation V 22 - V21, dividing the volume variation V 22 - V21 by a sampling period T to obtain a flow q 22 of the liquid discharge at the sampling time of T 2;
；
Fifteen, when the pressure of the pressure sensor (7) is reduced to a minimum working pressure value p 1 of the energy accumulator, the controller (8) stops collecting signals of the weighing sensor (13) and the pressure sensor (7); the controller (8) outputs a zero-voltage signal to an electromagnet of the liquid discharge valve (10), the electromagnet of the liquid discharge valve (10) is powered off, and the liquid discharge valve (10) works at the right position;
Sixteenth, the controller (8) draws a characteristic curve of discharge flow rate change along with time and a curve of discharge process pressure change along with time according to the flow rate q 22 obtained by calculation of each continuous sampling time and a signal p 22 of the pressure sensor (7).
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