阅读说明：本技术 一种直流电磁阀动作时间检测方法及装置 (Method and device for detecting action time of direct-current electromagnetic valve ) 是由 舒芝锋 黄萍 刘赛楠 杨威 王颖 朱汉武 朱翠云 于 2020-06-23 设计创作，主要内容包括：本发明属于电磁检修领域,具体涉及一种直流电磁阀动作时间检测方法及装置。本发明方法包括安装电路和生成电磁阀动作时间检测试验。本装置包括电磁阀、电流传感器、电压传感器和数据分析仪；电压传感器与电磁阀两端并联连接；电磁阀线缆穿过电流传感器,电压传感器、电流传感器分别与数据分析仪对应端口连接。本发明解决现有检测方法准确度低,只能离线测试等不足。同时还可以测试出电磁阀的其他故障,如电磁阀拒动、加载电压不足、阀芯摩擦加剧、阀门通路存在障碍物等。(The invention belongs to the field of electromagnetic overhaul, and particularly relates to a method and a device for detecting the action time of a direct-current electromagnetic valve. The method comprises the steps of installing a circuit and generating an electromagnetic valve action time detection test. The device comprises an electromagnetic valve, a current sensor, a voltage sensor and a data analyzer; the voltage sensor is connected with two ends of the electromagnetic valve in parallel; the electromagnetic valve cable passes through the current sensor, and the voltage sensor and the current sensor are respectively connected with corresponding ports of the data analyzer. The invention solves the defects that the existing detection method has low accuracy and can only carry out off-line test. Meanwhile, other faults of the electromagnetic valve, such as failure of the electromagnetic valve, insufficient loading voltage, aggravated friction of the valve core, existence of obstacles in a valve passage and the like, can be tested.)

1. A method for detecting the action time of a direct current electromagnetic valve is characterized by comprising the following steps: the method comprises the following steps:

the method comprises the following steps: installing a voltage sensor (3), and respectively connecting the positive terminal and the negative terminal of the voltage sensor (3) with the positive terminal and the negative terminal of the electromagnetic valve (1) to form parallel connection;

step two: installing a current sensor (2), and enabling a single cable of the electromagnetic valve (1) to pass through an induction area of the current sensor (2), wherein the current directions of the two cables are corresponding;

step three: connecting the voltage sensor (3) and the current sensor (2) with corresponding ports of the data analyzer (4);

step four: the action control switch starts to synchronously acquire current and voltage data of the electromagnetic valve (1) and transmits the data to the data analyzer (4);

step five: aiming at a coil electrifying circuit of the electromagnetic valve (1), simultaneously considering the change of a coil inductance L when an iron core of the electromagnetic valve (1) moves, inputting basic parameters of the electromagnetic valve (1) and establishing a circuit equation;

step six: the magnetic valve (1) is demagnetized, the action point E, F and the action time TDF are obtained in the same way after the control switch is turned off; a test report is automatically generated in the data analyzer (4).

2. The method for detecting the actuation time of a dc solenoid valve according to claim 1, wherein:

the circuit equation is as follows:

wherein the magnetic flux phi is IL

Therefore:

wherein: u (t), I (t) are measured by a voltage sensor (3) and a current sensor (2) in real time,calculating to obtain the cold resistance R of the electromagnetic valve (1) from I (t); due to L (t),Unknown, the differential equation is solved to obtain L (t), the least square method is adopted to fit the current with sine fluctuation, the I (t), the fitting curve and the L (t) curve are synchronously displayed, and then the excitation action point A, B and the action time TOB of the electromagnetic valve (1) are obtained through analysis.

3. A kind of direct current electromagnetic valve movement time checkout gear, characterized by that: comprises an electromagnetic valve (1), a current sensor (2), a voltage sensor (3) and a data analyzer (4); the voltage sensor (3) is connected with two ends of the electromagnetic valve (1) in parallel; the cable of the electromagnetic valve (1) penetrates through the current sensor (2), and the voltage sensor (3) and the current sensor (2) are respectively connected with corresponding ports of the data analyzer (4).

4. The apparatus according to claim 2, wherein: a single cable of the electromagnetic valve (1) penetrates through a sensing area of the current sensor (2).

5. The apparatus according to claim 2, wherein: the electromagnetic valve (1) is connected with the follow current loop in parallel.

6. The apparatus according to claim 4, wherein: the follow current loop is connected with the control switch in parallel, and the control switch is connected with the voltage source Un in series.

Technical Field

The invention belongs to the field of electromagnetic overhaul, and particularly relates to a method and a device for detecting the action time of a direct-current electromagnetic valve.

Background

The direct current solenoid valve has quick action response and simple and reliable operation and control, so that the direct current solenoid valve is widely used in industrial systems, but faults such as over-tolerance of action time, refusal of action and the like can occur, the normal operation of the system is influenced, and even certain accidents are caused. At present, most of the conventional detection methods are adopted, corrective maintenance is carried out after obvious faults are found, the test error is large, the conditions of mistaken maintenance, missed maintenance and the like exist, and great potential safety hazards are caused to industrial systems. In addition, in the domestic power supply of the direct current electromagnetic valve, the direct current voltage output by alternating current rectification is generally used for supplying power, and the rectified voltage still presents a certain sine fluctuation state, so that the action point of the electromagnetic valve is difficult to accurately obtain practically.

The invention mainly aims at the problems, provides a set of action time detection method and a set of action time detection device for a direct current electromagnetic valve, can carry out online test on the electromagnetic valve without influencing the normal operation of the electromagnetic valve, can be used in an offline state, and carries out action time verification on the maintained electromagnetic valve.

Disclosure of Invention

1. The purpose is as follows:

the invention aims to provide a method and a device for detecting the action time of a direct current solenoid valve, which can be used for carrying out online test on the performance of the solenoid valve without influencing the normal operation of the solenoid valve and solving the defects that the existing detection method has low accuracy and can only carry out offline test and the like. Meanwhile, other faults of the electromagnetic valve, such as failure of the electromagnetic valve, insufficient loading voltage, aggravated friction of the valve core, existence of obstacles in a valve passage and the like, can be tested.

2. The technical scheme is as follows:

the invention comprises the following steps:

the method comprises the following steps: installing a voltage sensor, and respectively connecting the positive terminal and the negative terminal of the voltage sensor with the positive terminal and the negative terminal of the electromagnetic valve to form parallel connection;

step two: installing a current sensor, and enabling a single cable of the electromagnetic valve to penetrate through a current sensor induction area, wherein the current directions of the two cables are corresponding;

step three: connecting a voltage sensor and a current sensor with corresponding ports of a data analyzer;

step four: the action control switch starts to synchronously acquire current and voltage data of the electromagnetic valve and transmits the data to the data analyzer;

step five: aiming at a solenoid coil electrifying circuit, simultaneously considering the change of a coil inductance L when an electromagnetic valve iron core moves, inputting basic parameters of the electromagnetic valve and establishing a circuit equation;

step six: the solenoid de-excitation action point E, F and the action time TDF are obtained in the same way after the control switch is turned off; a test report is automatically generated in the data analyzer.

The circuit equation is as follows:

wherein the magnetic flux phi is IL

Therefore:

wherein: u (t), I (t) are measured by a voltage sensor (3) and a current sensor (2) in real time,calculating to obtain the cold resistance R of the electromagnetic valve from I (t); due to L (t),Unknown, the differential equation is solved to obtain L (t), the least square method is adopted to fit the current with sine fluctuation, the I (t), the fitted curve and the L (t) curve are synchronously displayed, and then the electromagnetic valve excitation action point A, B and the action time TOB are obtained through analysis.

A direct current electromagnetic valve action time detection device comprises an electromagnetic valve, a current sensor, a voltage sensor and a data analyzer; the voltage sensor is connected with two ends of the electromagnetic valve in parallel; the electromagnetic valve cable passes through the current sensor, and the voltage sensor and the current sensor are respectively connected with corresponding ports of the data analyzer.

And a single cable of the electromagnetic valve penetrates through the current sensor induction area.

The electromagnetic valve is connected with the follow current loop in parallel.

The follow current loop is connected with the control switch in parallel, and the control switch is connected with the voltage source Un in series.

The invention has the following remarkable effects: the current of the direct-current electromagnetic valve is not an ideal current curve, and the traditional method is difficult to accurately acquire the action point and the action time of the electromagnetic valve, synchronously acquire the voltage and the current of the electromagnetic valve, accurately analyze the action point and the action time of the electromagnetic valve and avoid misjudgment; the electromagnetic valve is tested on line, the electromagnetic valve is prevented from being disassembled, and the normal operation of the system is not influenced; besides testing the valve action time, other faults of the electromagnetic valve can be found through the voltage, current and inductance curve of the electromagnetic valve, such as the failure of the electromagnetic valve, insufficient loading voltage, aggravated friction of a valve core, the existence of obstacles in a valve passage and the like.

Drawings

FIG. 1 is a schematic diagram of the solenoid valve actuation time detection device system of the present invention;

fig. 2 is a schematic diagram of an idealized current curve for the solenoid valve of the present invention.

Fig. 3 is a schematic diagram of an actual curve of the solenoid valve of the present invention.

In the figure: 1 DC electromagnetic valve, 2 current sensor, 3 voltage sensor, 4 data analyzer

Detailed Description

The invention is described in further detail below with reference to the figures and the embodiments.

As shown in fig. 1 to 3, the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

A method and a device for detecting the action time of a direct current electromagnetic valve comprise a current sensor 2, a voltage sensor 3 and a data analyzer 4. The voltage sensor 3 is connected with two ends of the electromagnetic valve 1, the electromagnetic valve 1 is provided with a cable which passes through the current sensor 2, and the voltage sensor 3 and the current sensor 2 are respectively connected with corresponding ports of the data analyzer 4.

The voltage sensor 3 is connected with the electromagnetic valve 1 in parallel, and a single cable of the electromagnetic valve 1 penetrates through the induction area of the current sensor 2.

A method for detecting action time of a direct current electromagnetic valve comprises the following steps:

the method comprises the following steps: installing a voltage sensor 3, and respectively connecting the positive and negative terminals of the voltage sensor 3 with the positive and negative terminals of the electromagnetic valve 1 to form parallel connection;

step two: installing a current sensor 2, enabling a single cable of the electromagnetic valve 1 to penetrate through an induction area of the current sensor 2, and paying attention to the corresponding current direction;

step three: connecting the voltage sensor 3 and the current sensor 2 with corresponding ports of the data analyzer 4;

step four: the action control switch starts to synchronously acquire current and voltage data of the electromagnetic valve 1 and transmits the data to the data analyzer 4;

step five: aiming at the coil electrifying circuit of the electromagnetic valve 1, the change of the coil inductance L when the iron core of the electromagnetic valve 1 moves is considered, the basic parameters of the electromagnetic valve 1 are input, and a circuit equation is established:wherein the magnetic flux phi is IL

Therefore:

wherein: u (t), I (t) are measured by the voltage sensor 3 and the current sensor 2 in real time,calculating to obtain the cold resistance R of the electromagnetic valve 1 from I (t); due to L (t),Unknown, and obtains L (t) by solving the above differential equation, and simultaneously, for the electricity with sine waveFitting by using a least square method, synchronously displaying the I (t), the fitting curve and the L (t) curve, and then analyzing to obtain an excitation action point A, B of the electromagnetic valve 1 and an action time TOB;

step six: the point E, F at which the solenoid valve 1 is de-energized and the time TDF of actuation are obtained in the same way after the control switch has been turned off. And automatically generating a test report in the data analyzer 4, automatically analyzing whether the action time TOB and the TDF are qualified or not, and completing a detection test of the action time of the electromagnetic valve.

As shown in fig. 2, O is a solenoid valve energization start point, a is a solenoid valve operation start point, B is a solenoid valve operation completion point, C is a solenoid valve excitation completion point, D is a solenoid valve de-energization start point, E is a solenoid valve de-energization operation start point, F is a solenoid valve de-energization operation completion point, G is a solenoid valve de-energization completion point, TOB is a solenoid valve excitation operation time, and TDF is a solenoid valve de-energization operation time.