CN117724559B - Positive and negative voltage pulse testing machine - Google Patents
Positive and negative voltage pulse testing machine Download PDFInfo
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- CN117724559B CN117724559B CN202410176140.8A CN202410176140A CN117724559B CN 117724559 B CN117724559 B CN 117724559B CN 202410176140 A CN202410176140 A CN 202410176140A CN 117724559 B CN117724559 B CN 117724559B
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- 238000012360 testing method Methods 0.000 title claims abstract description 63
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 230000033001 locomotion Effects 0.000 claims description 21
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- 238000000034 method Methods 0.000 claims description 9
- 230000035485 pulse pressure Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 230000004069 differentiation Effects 0.000 claims 1
- 238000005086 pumping Methods 0.000 abstract 1
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- 239000012530 fluid Substances 0.000 description 4
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- 238000007906 compression Methods 0.000 description 2
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- 230000000694 effects Effects 0.000 description 2
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- 238000010438 heat treatment Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
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- 238000011156 evaluation Methods 0.000 description 1
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Abstract
The application relates to a positive and negative voltage pulse testing machine, which relates to the technical field of positive and negative voltage testing and comprises the following components: an oil tank; the medium is stored in the oil tank; a liquid filling pump; the liquid filling pump is communicated with the oil tank; pumping the medium in the oil tank into the pipeline by the liquid filling pump; a variable frequency circulating pump; the variable-frequency circulating pump is communicated with the liquid filling pump; the variable frequency circulating pump is used for medium circulation of the pipeline; the cold and hot integrated machine; the cold and hot integrated machine is communicated with the variable frequency circulating pump; the cold and hot integrated machine heats the medium in the pipeline of the integrated machine and exchanges heat with the medium in the pipeline through the plate heat exchanger, so that the medium in the pipeline reaches a preset temperature value; a pulse oil cylinder; a temperature sensor; the temperature sensor is used for detecting the temperature of the medium in the pipeline; a flow sensor; the flow sensor is used for detecting the flow of the medium in the pipeline; an electromagnetic pump; the electromagnetic pump is matched with the pressurizing valve for pressurizing; a hydraulic station; the hydraulic station is connected with a servo valve; the hydraulic station is used for providing a hydraulic power source and driving the pulse oil cylinder through a servo valve.
Description
Technical Field
The application relates to the technical field of positive and negative voltage testing, in particular to a positive and negative voltage pulse testing machine.
Background
At present, high-frequency positive and negative voltage alternating tests are difficult to realize when positive and negative voltage cycle tests are carried out, so that effective performance detection and evaluation of devices such as motors and drivers are difficult to carry out.
Therefore, developing positive and negative voltage alternating test equipment with faster frequency and higher pressure is a technical problem which is urgently needed to be overcome by the person skilled in the art.
Disclosure of Invention
In order to at least partially solve the technical problems, the application provides a positive and negative voltage pulse testing machine.
The application provides a positive and negative pressure pulse testing machine which adopts the following technical scheme.
A positive and negative voltage pulse tester, comprising:
an oil tank; the medium is stored in the oil tank;
A liquid filling pump; the liquid filling pump is communicated with the oil tank; the liquid filling pump pumps the medium in the oil tank into a pipeline;
A variable frequency circulating pump; the variable-frequency circulating pump is communicated with the liquid filling pump; the variable frequency circulating pump is used for medium circulation of the pipeline;
The cold and hot integrated machine; the cold and hot integrated machine is communicated with the variable frequency circulating pump; the cold and hot integrated machine heats the medium in the pipeline of the cold and hot integrated machine and exchanges heat with the medium in the pipeline through the plate heat exchanger, so that the medium in the pipeline reaches a preset temperature value;
A pulse oil cylinder; the pulse oil cylinder realizes pipeline pressure change through piston movement and realizes pressure alternation of-0.6 to 4.5 bar;
a temperature sensor; the temperature sensor is used for detecting the temperature of the medium in the pipeline;
a flow sensor; the flow sensor is used for detecting the flow of the medium in the pipeline;
A hydraulic station; the hydraulic station is connected with a servo valve; the hydraulic station is used for providing a hydraulic power source and driving the pulse oil cylinder through a servo valve; the hydraulic station is communicated with the cold and hot integrated machine;
The linear reciprocating motion of the pulse oil cylinder is realized by controlling the reversing of the servo valve; the piston movement of the pulse oil cylinder realizes the change of the cavity in the pipeline so as to generate the pressure change in the pipeline; the pulse frequency is controlled by controlling the running speed of the piston of the pulse oil cylinder, and the pressure is controlled by controlling the movement stroke of the piston of the pulse oil cylinder.
Optionally, the testing machine further includes:
A pressure sensor; the pressure sensor is used for detecting the pressure of the medium in the pipeline;
a pressure release valve; the pressure release valve is electrically connected with the pressure sensor; and when the pressure in the pipeline exceeds a preset interval, performing pressure relief adjustment.
Optionally, the testing machine further comprises a pressurizing valve and an electromagnetic pump; the pressurizing valve is electrically connected with the pressure sensor; the pressurizing valve is used for performing pressurizing adjustment when the pressure in the pipeline is lower than a preset interval; the electromagnetic pump is matched with the pressurizing valve for pressurizing.
Optionally, the testing machine further comprises a vacuum pump; the vacuum pump is used for carrying out vacuumizing treatment on the pipeline before exhausting.
Optionally, a liquid level alarm is arranged in the oil tank; and the liquid level alarm is used for controlling the testing machine to be unable to start and alarm when the liquid level in the oil tank is lower than the warning value.
Optionally, the testing machine further comprises a filter; the filter is disposed between the oil tank and the passage of the electromagnetic pump.
Optionally, the testing machine further comprises a safety overflow valve; the relief valve is disposed between the tank and the passageway of the pressurization valve.
Optionally, the testing machine realizes the control of pulse pressure waveform, pulse times, pulse frequency and medium temperature through a PID control algorithm.
Optionally, the testing machine further comprises a plurality of manual ball valves.
Drawings
FIG. 1 is a system block diagram of a positive and negative voltage pulse testing machine according to an embodiment of the present application;
In the figure, 1, an oil tank; 2. a liquid filling pump; 3. a variable frequency circulating pump; 4. the cold and hot integrated machine; 5. a pulse oil cylinder; 6. a hydraulic station; 7. a temperature sensor; 8. a flow sensor.
Detailed Description
The application is further illustrated by the following description of the specific embodiments in conjunction with the accompanying drawings of fig. 1:
First, what needs to be described here is: in the description of the present application, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used for convenience of description only as regards orientation or positional relationship as shown in the accompanying drawings, and do not denote or imply that the apparatus or element in question must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application; moreover, the numerical terms such as the terms "first," "second," "third," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, a fixed connection, a releasable connection, an interference fit, a transition fit, or an integral connection; can be directly connected or indirectly connected through an intermediate medium; the specific meaning of the above terms in the present application will be understood by those skilled in the art according to the specific circumstances.
The embodiment of the application discloses a positive and negative voltage pulse testing machine. Referring to fig. 1, as an embodiment of a positive and negative voltage pulse tester, a positive and negative voltage pulse tester includes:
An oil tank 1; the tank 1 stores a medium. Specifically, the medium can be cooling liquid, and the temperature of the medium is between-40 and 150 ℃.
A filling pump 2; the liquid filling pump 2 is communicated with the oil tank 1; the filling pump 2 pumps the medium in the oil tank 1 into the pipeline. The infusion pump 2 is a device capable of generating suction by which it can draw in liquid from one place and then convey it to another place through a pipeline. The filling pump 2 is communicated with the oil tank 1 and pumps the medium in the oil tank 1 into the pipeline.
A variable frequency circulating pump 3; the variable-frequency circulating pump 3 is communicated with the liquid filling pump 2; the variable frequency circulating pump 3 is used for medium circulation of the pipeline. Specifically, the variable frequency circulating pump 3 mainly has the function of medium circulation on a pipeline, namely, the working speed of the pump is controlled by changing the frequency, so that continuous and stable liquid conveying is realized. When the variable frequency circulating pump 3 starts to work, the variable frequency circulating pump 3 can suck the liquid in the liquid filling pump 2 and convey the liquid through a pipeline, and in the process, the variable frequency circulating pump 3 can automatically adjust the working speed according to the set frequency so as to ensure the continuous flow of the liquid.
A cooling and heating integrated machine 4; the cold and hot integrated machine 4 is communicated with the variable frequency circulating pump 3; the cold and hot integrated machine 4 heats the medium in the pipeline of the cold and hot integrated machine and exchanges heat with the medium in the pipeline through the plate heat exchanger, so that the medium in the pipeline reaches a preset temperature value. Specifically, the heat and cold integrated machine 4 is a device with heating and cooling functions, and in the operation process, the heat and cold integrated machine 4 heats the medium in the pipeline of itself first to reach a preset temperature value. Then, heat exchange is carried out with the medium in the pipeline through the plate heat exchanger.
A pulse oil cylinder 5; the pulse oil cylinder 5 realizes pipeline pressure change through piston movement and realizes pressure alternation of-0.6 to 4.5 bar. The impulse cylinder 5 is a hydraulic device whose core function is to achieve force transmission by compressing and releasing liquid. When the liquid in the cylinder is compressed, its volume decreases while the pressure increases. This process is similar to spring compression, storing energy in a liquid. When energy needs to be released, the liquid in the oil cylinder can expand rapidly, and the stored energy is converted into kinetic energy. Second, the pulse cylinder 5 can generate a periodical pulse pressure. By controlling the compression and release speeds of the liquid in the oil cylinder, pulse pressure output with different frequencies and amplitudes can be realized.
A temperature sensor 7; the temperature sensor 7 is used for detecting the temperature of the medium in the pipeline. Specifically, the temperature sensor 7 acquires and records temperature data of the medium in the pipeline in real time through sensing and measurement.
A flow sensor 8; the flow sensor 8 is used for detecting the flow of the medium in the pipeline. The flow sensor 8 measures the time when the fluid passes through a specific area, and thereby calculates the flow rate of the fluid.
A hydraulic station 6; the hydraulic station 6 is connected with a servo valve; the hydraulic station 6 is used for providing a hydraulic power source and driving the pulse oil cylinder 5 through a servo valve. Specifically, the hydraulic station 6 converts the pressure energy of the liquid into mechanical energy, thereby driving the operation of various types of mechanical equipment. The servo valve accurately controls the flow and pressure of hydraulic oil according to the change of an input signal, so that the accurate control of a hydraulic system is realized. The pulse oil cylinder 5 receives the hydraulic oil from the hydraulic station 6 to realize quick and accurate action.
Wherein, the linear reciprocating motion of the pulse oil cylinder 5 is realized by controlling the reversing of the servo valve; the piston movement of the pulse oil cylinder 5 realizes the change of the cavity in the pipeline so as to generate the pressure change in the pipeline; the pulse frequency is controlled by controlling the running speed of the piston of the pulse oil cylinder 5, and the pressure is controlled by controlling the movement stroke of the piston of the pulse oil cylinder 5.
As a specific embodiment of the positive and negative voltage pulse tester, the tester further comprises:
A pressure sensor; the pressure sensor is used for detecting the pressure of the medium in the pipeline;
a pressure release valve; the pressure release valve is electrically connected with the pressure sensor; and when the pressure in the pipeline exceeds a preset interval, performing pressure relief adjustment.
Specifically, the pressure sensor operates on the principle that a physical quantity of pressure is converted into an electric signal by using a piezoelectric effect or a resistive effect. When the pressure of the medium changes, the pressure sensor can accurately capture the change and convert the change into an electric signal to be output. The pressure sensor of the pressure relief valve is electrically connected, and when the pressure in the pipeline exceeds a preset interval, the pressure relief valve is automatically opened to carry out pressure relief adjustment. The pressure in the pipeline is prevented from being too high, so that equipment is damaged or safety accidents occur.
As a specific implementation mode of the positive and negative pressure pulse testing machine, the testing machine further comprises a pressurizing valve and an electromagnetic pump; the pressurizing valve is electrically connected with the pressure sensor; the pressurizing valve is used for performing pressurizing adjustment when the pressure in the pipeline is lower than a preset interval; the electromagnetic pump is matched with the pressurizing valve for pressurizing.
In particular, a pressurization valve is a device for controlling the pressure of a fluid. When the pressure in the pipeline is lower than the preset interval, the pressurizing valve is started, and the pressure is regulated to be within the set range by means of increasing the fluid flow or changing the opening of the valve. An electromagnetic pump is a pump device that drives a flow of liquid using electromagnetic force. The electromagnetic induction type liquid pump converts electric energy into mechanical energy through an electromagnetic induction principle, and realizes liquid conveying and pressurization. The electromagnetic pump is matched with the pressurizing valve.
As a specific embodiment of the positive and negative pressure pulse testing machine, the testing machine further comprises a vacuum pump; the vacuum pump is used for carrying out vacuumizing treatment on the pipeline before exhausting.
Specifically, the main function of the vacuum pump is to pump the gas or liquid in the pipeline to achieve a certain low pressure state, so that accurate pressure control can be realized.
As one implementation mode of the positive and negative pressure pulse testing machine, a liquid level alarm is arranged in the oil tank 1; the liquid level alarm is used for controlling the testing machine to be unable to start and alarm when the liquid level in the oil tank 1 is lower than the warning value.
In particular, the main function of the level alarm is to monitor the level of the liquid in the tank 1. When the liquid level in the oil tank 1 is lower than a preset warning value, the liquid level alarm can be started immediately to control the testing machine so that the testing machine cannot be started. The liquid level alarm can also give out an audible or visual alarm to remind operators to pay attention to and take corresponding measures. As one embodiment of the positive and negative pressure pulse testing machine, the testing machine further comprises a filter; the filter is arranged between the oil tank 1 and the passage of the electromagnetic pump.
As one implementation mode of the positive and negative pressure pulse testing machine, the testing machine further comprises a safety overflow valve; the relief valve is provided between the tank 1 and the passage of the pressurization valve.
As one implementation mode of the positive and negative pressure pulse testing machine, the testing machine realizes the control of pulse pressure waveform, pulse times, pulse frequency and medium temperature through a PID control algorithm.
Specifically, the PID electrohydraulic control technology is a control technology that a PID (proportional-integral-derivative) control algorithm is applied to an electrohydraulic transmission system, and the electrohydraulic control system controls a hydraulic actuator through an electric signal so as to realize the motion control of a machine city. In the PID electrohydraulic control technology, proportional control is used for adjusting the amplitude of an output signal according to the magnitude of an error, and integral control is used for adjusting the area of the output signal according to the duration of the error; differential control is used to adjust the slope of the output signal based on the rate of error change. Through these sections, the PID control algorithm can achieve rapid response, stability and accuracy to the electro-hydraulic actuators.
The algorithm of PID electrohydraulic control technology mainly consists of three parts of proportion, integral and differential. These parts realize the control of the electrohydraulic actuator through the processing and the adjustment of the error signals. The following is a general form of PID electrohydraulic control technique algorithm;
1. proportional term (P): the proportional control is used for adjusting the amplitude of the output signal according to the error magnitude. The calculation formula of the proportion term is as follows: ; where P is the output of the proportional term, kp is the proportional gain coefficient, and e (t) is the error signal at the current time.
2. Integral term (I): the integration control is used to adjust the area of the output signal according to the error duration. The calculation formula of the integral term is as follows: ; where I is the output of the integral term, ki is the integral gain factor, and ∈ (t) dt represents the integral of the error signal.
3. Differential term (D): the differential control is used to adjust the slope of the output signal according to the rate of error change. The calculation formula of the differential term is as follows: ; where D is the output of the differential term, kd is the differential gain coefficient, and de (t)/dt represents the derivative of the error signal.
The final control signal may be obtained by adding the outputs of the three parts to: ; wherein u (t) is a control signal, and t is the current time. The PID electrohydraulic control technology algorithm needs to carry out coefficient adjustment according to the characteristics and the requirements of the system. The selection of the proportional gain coefficient, the integral gain coefficient and the differential gain coefficient is critical to the control quality of the system, and the adjustment and the optimization are required according to the actual situation.
As one implementation mode of the positive and negative pressure pulse testing machine, the testing machine further comprises a plurality of manual ball valves.
In summary, the implementation process of the embodiment of the application comprises the following steps:
exhaust cycle: the device comprises an oil tank 1, a filling pump 2, a filling ball valve, a variable frequency circulating pump 3, a plate heat exchanger, an inlet exhaust ball valve, a test product, an outlet exhaust ball valve, a filter, a vacuum pump and the oil tank 1.
The circulation flow direction of the pressure pulse medium is as follows: variable frequency circulating pump 3, plate heat exchanger, test product, flow sensor 8 and variable frequency circulating pump 3.
Principle of exhaust: starting an exhaust function, wherein the vacuum pump performs vacuumizing treatment on the circulating pipeline and the test product, when the set pressure is reached, the liquid filling ball valve is started, the liquid filling pump 2 is started to circularly fill liquid to the whole pipeline through the variable-frequency circulating pump 3, and the exhaust is stopped after 1 minute (the exhaust time can be set, the larger the product containing cavity is, the longer the exhaust time is). At this time, the pipeline is fully filled with circulating medium.
Pulse theory of operation: the pulse oil cylinder 5 (the oil cylinder is specially designed) can linearly reciprocate by precisely controlling the reversing of the servo valve. The movement of the cylinder piston can cause the change of the containing cavity in the pipeline so as to generate the pressure change in the pipeline. The pulse frequency is controlled by controlling the running speed of the piston, and the pressure is controlled by controlling the movement stroke of the piston.
The whole system works on the principle and work flow:
The working flow is as follows:
1. And (5) after the product to be tested is connected into the pipeline.
2. And setting product testing parameters.
3. After start-up, the apparatus performs an exhaust treatment on the product.
4. And (5) automatically performing pulse test after the exhaust is finished.
5. And after the test is finished, the equipment automatically stores a test record and manually replaces the test product.
Working principle:
1. after the equipment is started and exhausted, the variable frequency circulating pump 3 is responsible for medium circulation in a pipeline, and heat exchange is carried out between the medium circulation and the cold and hot integrated machine 4 in the plate type heat exchanger, so that the set heat in the temperature range of-40-150 ℃ is obtained. When the set temperature is reached, the pulse oil cylinder 5 starts to perform the cylinder, and performs the piston movement according to the set parameters, so that the pipeline generates the set pulse pressure. And when the pressure is lower than a preset interval, performing pressure supplementing treatment through a pressurizing valve, and when the pressure is too high, performing pressure relieving treatment through a pressure relieving valve. When abnormal conditions such as sudden pressure rise occur in the test process, the safety unloading valve can be jacked up by the pressure exceeding the preset interval, so that pressure relief is carried out, and components in the equipment pipeline are protected.
2. In the pressure pulse process, inlet and outlet pressure differences of the tested product are detected through an inlet pressure sensor and an outlet pressure sensor. The inlet and outlet temperatures of the test product are detected by an inlet temperature sensor 7 and an outlet temperature sensor 7. The flow of the medium in the pipeline is detected by the flow sensor 8, the flow sensor 8 interacts with the variable frequency circulating pump 3, and the flow of the medium in the pipeline is controlled by controlling the frequency of the motor.
The project uses electrohydraulic servo control technology, realizes that the medium in the pipeline realizes that the positive and negative alternating pressure is between-0.6 bar and 4.5bar, can realize the frequency of 0-1 Hz by controlling the piston movement of the oil cylinder, and the control precision is controlled within +/-1 percent FS, thereby ensuring the stability of the test working condition. The system realizes stable system pressure through the accurate matching of various valve devices such as a pressurizing valve, a pressure relief valve, a safety overflow valve, a pulse oil cylinder 5 and the like. The alternating pressure of positive pressure and negative pressure is realized through the oil cylinder. In the pressure alternating process, the pressure in the pipeline is regulated through the pressurizing valve and the pressure relief valve, so that stable working condition output of pressure alternating is formed in the pipeline, and different pressure alternating frequencies can be realized by controlling the stroke and the movement speed of the oil cylinder.
It should be noted that: although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present application may be modified or equivalent thereto without departing from the spirit and scope of the application, and all such modifications and improvements thereof are intended to be included within the scope of the appended claims.
Claims (2)
1. A positive and negative voltage pulse testing machine, comprising:
an oil tank; the medium is stored in the oil tank;
A liquid filling pump; the liquid filling pump is communicated with the oil tank; the liquid filling pump pumps the medium in the oil tank into a pipeline;
A variable frequency circulating pump; the variable-frequency circulating pump is communicated with the liquid filling pump; the variable frequency circulating pump is used for medium circulation of the pipeline;
The cold and hot integrated machine; the cold and hot integrated machine is communicated with the variable frequency circulating pump; the cold and hot integrated machine heats the medium in the pipeline of the cold and hot integrated machine and exchanges heat with the medium in the pipeline through the plate heat exchanger, so that the medium in the pipeline reaches a preset temperature value;
A pulse oil cylinder; the pulse oil cylinder realizes pipeline pressure change through piston movement and realizes pressure alternation of-0.6 to 4.5 bar;
a temperature sensor; the temperature sensor is used for detecting the temperature of the medium in the pipeline;
a flow sensor; the flow sensor is used for detecting the flow of the medium in the pipeline;
A hydraulic station; the hydraulic station is connected with a servo valve; the hydraulic station is used for providing a hydraulic power source and driving the pulse oil cylinder through a servo valve; the hydraulic station is communicated with the cold and hot integrated machine;
the linear reciprocating motion of the pulse oil cylinder is realized by controlling the reversing of the servo valve; the piston movement of the pulse oil cylinder realizes the change of the cavity in the pipeline so as to generate the pressure change in the pipeline; the pulse frequency is controlled by controlling the running speed of the piston of the pulse oil cylinder, and the pressure is controlled by controlling the movement stroke of the piston of the pulse oil cylinder;
After the equipment is started and exhausted, the variable frequency circulating pump is responsible for medium circulation in a pipeline, and heat exchange is carried out between the medium circulation and the cold and hot integrated machine in the plate heat exchanger to obtain the set heat in the temperature range of-40 to 150 ℃; when the set temperature is reached, the pulse oil cylinder starts to perform the cylinder, and the piston moves according to the set parameters, so that the pipeline generates the set pulse pressure;
The testing machine further comprises:
A pressure sensor; the pressure sensor is used for detecting the pressure of the medium in the pipeline;
a pressure release valve; the pressure release valve is electrically connected with the pressure sensor; when the pressure in the pipeline exceeds a preset interval, pressure relief adjustment is carried out;
the testing machine further comprises a pressurizing valve and an electromagnetic pump; the pressurizing valve is electrically connected with the pressure sensor; the pressurizing valve is used for performing pressurizing adjustment when the pressure in the pipeline is lower than a preset interval; the electromagnetic pump is matched with the pressurizing valve for pressurizing;
the testing machine further comprises a vacuum pump; the vacuum pump is used for carrying out vacuumizing treatment on the pipeline before exhausting;
a liquid level alarm is arranged in the oil tank; the liquid level alarm is used for controlling the testing machine to be unable to start and alarm when the liquid level in the oil tank is lower than an alarm value;
the testing machine further comprises a filter; the filter is arranged between the oil tank and the passage of the electromagnetic pump;
The testing machine also comprises a safety overflow valve; the safety overflow valve is arranged between the oil tank and a passage of the pressurizing valve;
The testing machine realizes the control of pulse pressure waveform, pulse times, pulse frequency and medium temperature through a PID control algorithm, wherein the algorithm of the PID electrohydraulic control technology consists of three parts of proportion, integration and differentiation, and realizes the control of an electrohydraulic executive component through the processing and adjustment of an error signal, and the method comprises the following steps:
Proportional term (P): the proportional control is used for adjusting the amplitude of the output signal according to the error size, and the calculation formula of the proportional term is as follows: ; wherein P is the output of a proportional term, kp is a proportional gain coefficient, and e (t) is an error signal at the current moment;
Integral term (I): the integral control is used for adjusting the area of the output signal according to the error duration, and the calculation formula of the integral term is as follows: ; wherein I is the output of the integral term, ki is the integral gain factor, +.e (t) dt represents the integral of the error signal;
differential term (D): the differential control is used for adjusting the slope of the output signal according to the error change rate, and the calculation formula of the differential term is as follows: ; wherein D is the output of the differential term, kd is the differential gain coefficient, and de (t)/dt represents the derivative of the error signal;
the final control signal is obtained by adding the outputs of the three parts to: ; wherein u (t) is a control signal, and t is the current moment;
according to the electrohydraulic servo control technology, the testing machine realizes that the medium in the pipeline realizes that the positive and negative alternating pressure is between-0.6 bar and 4.5bar, the frequency of 0-1 Hz can be realized, and the control precision is controlled within +/-1 percent FS;
Exhaust cycle of the tester: oil tank, liquid filling pump, liquid filling ball valve, variable frequency circulating pump, plate heat exchanger, inlet exhaust ball valve, test product, outlet exhaust ball valve, filter, vacuum pump and oil tank;
The pressure pulse medium circulation flow direction of the testing machine is as follows: variable frequency circulating pump, plate heat exchanger, test product, flow sensor and variable frequency circulating pump;
the exhaust principle of the testing machine: starting an exhaust function, wherein the vacuum pump firstly performs vacuumizing treatment on the circulating pipeline and the test product, when the set pressure is reached, the liquid filling ball valve is started, the liquid filling pump starts to circularly fill liquid in the whole pipeline through the variable-frequency circulating pump, and the exhaust is stopped according to the set exhaust time, so that the pipeline is fully filled with circulating medium;
pulse theory of operation of testing machine: the linear reciprocating motion of the pulse oil cylinder is realized by precisely controlling the reversing of the servo valve, and the piston motion of the oil cylinder causes the change of the containing cavity in the pipeline so as to generate the pressure change in the pipeline; the pulse frequency is controlled by controlling the running speed of the piston, and the pressure is controlled by controlling the movement stroke of the piston.
2. The positive and negative pressure pulse tester according to claim 1, further comprising a plurality of manual ball valves.
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| CN201508303U (en) * | 2009-09-10 | 2010-06-16 | 深圳市弗赛特检测设备有限公司 | Hose pulse testing machine |
| CN204731017U (en) * | 2015-07-06 | 2015-10-28 | 天津赢盛富华科技发展有限公司 | Hydraulic servo pressure alternation test platform |
| CN208443568U (en) * | 2018-06-22 | 2019-01-29 | 浙江富铭工业机械有限公司 | A kind of multifunctional pulse multi-function test stand |
| CN211292297U (en) * | 2019-11-28 | 2020-08-18 | 深圳市万斯得自动化设备有限公司 | Positive and negative pressure comprehensive test system |
| CN216132846U (en) * | 2021-09-01 | 2022-03-25 | 江苏和敦科技制造有限公司 | Positive and negative pressure alternation testing machine |
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