Digital fiber sensing amplifier-based solenoid internal leakage detection device and method

Abstract

The present application relates to a digital fiber sensing amplifier-based electromagnetic valve inner leakage detection device and method, mainly solving the problem that the existing oil drop inner leakage detection of the hydraulic electromagnetic valve is performed manually, the steps are complicated, time-consuming is long, and due to human factors, the detection result is inaccurate. Including measuring medium drop nozzle, digital fiber sensing amplifier, intermediate relay, container and computer; the input end of the measuring medium drop nozzle is used for connecting with the oil return port of the electromagnetic valve, the digital fiber sensing amplifier is arranged below the measuring medium drop nozzle; the container is placed below the digital fiber sensing amplifier; the wiring end of the digital fiber sensing amplifier is used for connecting the external control power supply, the signal output end of the digital fiber sensing amplifier is connected with the positive electrode of the coil KAQ of the intermediate relay, and the negative electrode of the coil KAQ is connected with the negative electrode of the wiring end of the digital fiber sensing amplifier; the normally open contact KA of the intermediate relay is used for connecting with the external signal power supply, and the other end is connected with the computer.

Description

Technical Field

[0001] This invention relates to a device and method for detecting internal leakage in solenoid valves, specifically to a device for detecting internal leakage in solenoid valves based on a digital fiber optic sensor amplifier and a detection method using the device. Background Technology

[0002] Hydraulic solenoid valves are fundamental automation components that use electromagnetic control to regulate fluid flow. In industrial control systems, they are commonly used to adjust fluid direction, flow rate, speed, or other parameters. Existing hydraulic solenoid valves consist of an electromagnetic coil, an electromagnetic actuator, and a valve body containing multiple valves. The valve body has an internal chamber, and a sealing ring between the electromagnetic actuator and the chamber seals the chamber. Its working principle is as follows: the electromagnetic coil drives the electromagnetic actuator to connect the chamber and the valves; when the electromagnetic coil is de-energized, the electromagnetic actuator stops operating, and the sealing ring separates the chamber and the valves, blocking the connection. However, existing hydraulic solenoid valves can leak small amounts of oil. This leaked oil crystallizes on the inner wall of the chamber, leading to a decrease in the valve's performance. Therefore, it is necessary to periodically check for internal oil leakage to ensure the performance of the hydraulic solenoid valve.

[0003] In existing technologies, the internal leakage of solenoid valves is usually detected manually by reading the oil volume in the measuring cup to determine whether the internal leakage of the solenoid valve is qualified. However, the manual detection method is cumbersome, time-consuming, and the accuracy of the test results is poor due to the influence of human factors. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems of existing methods for detecting internal leakage of hydraulic solenoid valves by manual means, which are cumbersome, time-consuming, and have poor accuracy due to human factors. The invention provides a solenoid valve internal leakage detection device and method based on a digital fiber optic sensor amplifier.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] The solenoid valve internal leakage detection device based on digital fiber optic sensor amplifier is unique in that it includes a measuring medium nozzle, a digital fiber optic sensor amplifier, an intermediate relay, a container, and a computer.

[0007] The input end of the measuring medium nozzle is used to connect to the oil return port of the solenoid valve to be tested. The digital fiber optic sensor amplifier is located below the output end of the measuring medium nozzle and is used to emit a signal when the oil droplet passes through. Both the measuring medium nozzle and the digital fiber optic sensor amplifier are mounted on the external panel.

[0008] The container is placed below the digital fiber optic sensor amplifier;

[0009] The digital fiber optic sensor amplifier's terminals are used to connect to an external control power supply. The signal output terminal of the digital fiber optic sensor amplifier is connected to the positive terminal of the intermediate relay's coil KAQ, which is used to activate the normally open contact KA of the intermediate relay during the duration of the signal emitted by the digital fiber optic amplifier. The negative terminal of the intermediate relay's coil KAQ is connected to the negative terminal of the digital fiber optic sensor amplifier's terminals. One end of the normally open contact KA of the intermediate relay is used to connect to an external signal power supply, and the other end of the normally open contact KA is connected to a computer to record and display the number of times the normally open contact KA of the intermediate relay has activated.

[0010] Furthermore, the operating time of the intermediate relay is less than 10ms, and the reset time is less than 5ms.

[0011] Furthermore, the digital fiber optic sensing amplifier is a PNP type multi-point photoelectric switch.

[0012] Furthermore, the container is a measuring cup.

[0013] This invention also provides a method for detecting internal leakage of an electromagnetic valve based on a digital fiber optic sensor amplifier, employing a device for detecting internal leakage of an electromagnetic valve based on a digital fiber optic sensor amplifier. Its unique feature lies in including the following steps:

[0014] Step 1: The digital fiber optic sensor amplifier senses the oil droplets. When an oil droplet passes through, the digital fiber optic sensor amplifier sends an electrical signal.

[0015] Step 2: When the intermediate relay receives an electrical signal from the digital fiber optic sensor amplifier, the normally open contact KA of the intermediate relay operates and then resets during the duration of the electrical signal.

[0016] Step 3: Receive the action signal of the normally open contact KA of the intermediate relay through the computer. The counter in the computer counts once for each action signal received.

[0017] The computer receives the reset signal from the normally open contact KA of the intermediate relay. If the reset signal is received within the preset reset time and the computer determines that the actual detection time has not reached the preset detection time, it returns to step 1. If the computer does not receive the reset signal from the normally open contact KA of the intermediate relay after the preset reset time has been reached, it determines that the solenoid valve has internal leakage and is unqualified, and proceeds to step 5.

[0018] If the computer determines that the actual detection time has reached the preset detection time, then proceed to step 4; the preset detection time is the sum of the solenoid valve's energizing time M and de-energizing time N, where M ≥ 2 min and N ≥ 2 min.

[0019] Step 4: The computer determines whether the actual count of the counter within the preset detection time has reached the preset count. If the preset count has not been reached, the solenoid valve is qualified; if the preset count has been reached, the solenoid valve is unqualified.

[0020] Step 5: The computer displays the test results of the solenoid valve, completing the oil droplet internal leakage test of the solenoid valve.

[0021] Furthermore, in step 3, the preset reset time is 10 seconds.

[0022] Furthermore, in step 3, M = N = 2min.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The digital fiber optic sensing amplifier of this invention can send a signal to the coil of the intermediate relay when the oil droplet passes through it. The coil is energized and drives the normally open contact to operate, so that the voltage signal of the signal power supply can be input into the computer to achieve the purpose of counting. No manual operation is required throughout the process, which greatly improves the detection efficiency and prevents detection accuracy errors caused by human factors. Moreover, the structure is simple and easy to implement.

[0025] 2. The present invention improves the accuracy of detection by using an intermediate relay that operates quickly and can perform precise actions based on oil droplets. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of an embodiment of the electromagnetic valve internal leakage detection device based on a digital fiber optic sensor amplifier according to the present invention.

[0027] Figure 2 This is a wiring diagram of the digital fiber optic sensor amplifier, intermediate relay, and computer in an embodiment of the electromagnetic valve internal leakage detection device based on the digital fiber optic sensor amplifier of the present invention.

[0028] In the diagram, 1-measuring medium nozzle, 2-digital fiber optic sensor amplifier, 3-container. Detailed Implementation

[0029] To make the objectives, advantages, and features of this invention clearer, the following detailed description of the solenoid valve internal leakage detection device and method based on a digital fiber optic sensor amplifier, in conjunction with the accompanying drawings and specific embodiments, will further illustrate the present invention. The advantages and features of this invention will become clearer according to the following specific embodiments. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to conveniently and clearly assist in illustrating the objectives of the embodiments of this invention; furthermore, the structures shown in the drawings are often part of the actual structure.

[0030] like Figure 1and Figure 2 As shown, the present invention relates to a solenoid valve internal leakage detection device based on a digital fiber optic sensor amplifier, comprising a measuring medium nozzle 1, a digital fiber optic sensor amplifier 2, an intermediate relay, a container 3, and a computer.

[0031] The input end of the measuring medium nozzle 1 is used to connect to the oil return port of the solenoid valve to be tested. The digital fiber optic sensor amplifier 2 is located below the output end of the measuring medium nozzle 1. The oil leaking from the solenoid valve forms oil droplets through the measuring medium nozzle 1, which can be easily transmitted by the digital fiber optic sensor amplifier 2 when the oil droplets pass through. Both the measuring medium nozzle 1 and the digital fiber optic sensor amplifier 2 are mounted on the external panel. The container 3 is placed below the digital fiber optic sensor amplifier 2. In this embodiment, the container 3 is a measuring cup, which can facilitate direct reading of the collected oil volume.

[0032] The terminals of the digital fiber optic sensor amplifier 2 are used to connect to an external control power supply, which is a DC 24V power supply. The signal output terminal of the digital fiber optic sensor amplifier 2 is connected to the positive terminal of the intermediate relay coil KAQ, which is used to activate the normally open contact KA of the intermediate relay during the duration of the signal emitted by the digital fiber optic sensor amplifier 2. In this embodiment, the specifications of the intermediate relay are: activation time less than 10ms and reset time less than 5ms; it can activate quickly when the interval between two adjacent oil droplets is short, accurately collect the number of oil droplets, and improve the accuracy of counting. The negative terminal of the intermediate relay coil KAQ is connected to the negative terminal of the terminals of the digital fiber optic sensor amplifier 2. One end of the normally open contact KA of the intermediate relay is used to connect to an external signal power supply, which is a 5V power supply. The other end of the normally open contact KA is connected to a computer to record and display the number of times the normally open contact of the intermediate relay is closed. Specifically, the other end of the normally open contact KA is connected to the digital input terminal of the computer board.

[0033] This invention relates to a method for detecting internal leakage in solenoid valves based on fiber optic sensor amplifiers, employing a device for detecting internal leakage in solenoid valves based on fiber optic sensor amplifiers, and includes the following steps:

[0034] Step 1: The digital fiber optic sensor amplifier 2 senses the oil droplets. When an oil droplet passes through, the digital fiber optic sensor amplifier 2 sends an electrical signal.

[0035] Step 2: When the intermediate relay receives an electrical signal from the digital fiber optic sensor amplifier, the normally open contact KA of the intermediate relay operates and then resets during the duration of the electrical signal.

[0036] Step 3: Receive the action signal of the normally open contact KA of the intermediate relay through the computer. The counter in the computer counts once for each action signal received.

[0037] The computer receives the reset signal from the normally open contact KA of the intermediate relay. If the reset signal from the normally open contact KA is received within the preset reset time, and the computer determines that the actual detection time has not reached the preset detection time, then it returns to step 1. In this embodiment, the preset reset time is set to 10s according to the model of the solenoid valve. In other embodiments of the present invention, different preset reset times can be set according to different solenoid valves. If the computer does not receive the reset signal from the intermediate relay after the preset reset time is reached, it determines that the solenoid valve has internal leakage and that the solenoid valve is unqualified, and then proceeds to step 5.

[0038] If the computer determines that the actual detection time has reached the preset detection time, then step 4 is executed; the preset detection time is the sum of the solenoid valve energizing time M and de-energizing time N, where M ≥ 2 min and N ≥ 2 min. In this embodiment, M = N = 2 min. In other embodiments of the present invention, those skilled in the art can also set different energizing and de-energizing times according to different solenoid valves.

[0039] Step 4: The computer determines whether the actual count of the counter within the preset detection time has reached the preset count. If the preset count has not been reached, the solenoid valve is qualified; if the preset count has been reached, the solenoid valve is unqualified.

[0040] Step 5: The computer displays the test results of the solenoid valve, completing the oil droplet internal leakage test of the solenoid valve.

Claims

1. A solenoid valve internal leakage detection device based on a digital fiber optic sensor amplifier, characterized in that: It includes a measuring medium nozzle (1), a digital fiber optic sensor amplifier (2), an intermediate relay, a container (3), and a computer; The input end of the measuring medium nozzle (1) is used to connect to the oil return port of the solenoid valve to be tested. The digital fiber optic sensor amplifier (2) is located below the output end of the measuring medium nozzle (1) and is used to send a signal when the oil droplet passes through. Both the measuring medium nozzle (1) and the digital fiber optic sensor amplifier (2) are mounted on the external panel. The container (3) is placed below the digital fiber optic sensor amplifier (2); The terminals of the digital fiber optic sensor amplifier (2) are used to connect to an external control power supply. The signal output terminal of the digital fiber optic sensor amplifier (2) is connected to the positive terminal of the coil KAQ of the intermediate relay, which is used to activate the normally open contact KA of the intermediate relay during the duration of the signal emitted by the digital fiber optic sensor amplifier (2). The negative terminal of the coil KAQ of the intermediate relay is connected to the negative terminal of the terminals of the digital fiber optic sensor amplifier. One end of the normally open contact KA of the intermediate relay is used to connect to an external signal power supply, and the other end of the normally open contact KA is connected to a computer to record and display the number of times the normally open contact KA of the intermediate relay is activated.

2. The solenoid valve internal leakage detection device based on a digital fiber optic sensor amplifier according to claim 1, characterized in that: The operating time of the intermediate relay is less than 10ms and the reset time is less than 5ms.

3. The solenoid valve internal leakage detection device based on a digital fiber optic sensor amplifier according to claim 1 or 2, characterized in that: The digital fiber optic sensor amplifier (2) is a PNP type multi-point photoelectric switch.

4. The solenoid valve internal leakage detection device based on a digital fiber optic sensor amplifier according to claim 3, characterized in that: The container (3) is a measuring cup.

5. A method for detecting internal leakage of a solenoid valve based on a digital fiber optic sensor amplifier, employing the solenoid valve internal leakage detection device based on a digital fiber optic sensor amplifier as described in any one of claims 1-4, characterized in that... Includes the following steps: Step 1: The digital fiber optic sensor amplifier (2) senses the oil droplets. When an oil droplet passes through, the digital fiber optic sensor amplifier (2) sends an electrical signal. Step 2: When the intermediate relay receives an electrical signal from the digital fiber optic sensor amplifier (2), the normally open contact KA of the intermediate relay operates and then resets during the duration of the electrical signal. Step 3: Receive the action signal of the normally open contact KA of the intermediate relay through the computer. The counter in the computer counts once for each action signal received. The computer receives the reset signal from the normally open contact KA of the intermediate relay. If the reset signal is received within the preset reset time and the computer determines that the actual detection time has not reached the preset detection time, it returns to step 1. If the computer does not receive the reset signal from the normally open contact KA of the intermediate relay after the preset reset time has been reached, it determines that the solenoid valve has internal leakage and the solenoid valve is unqualified, and proceeds to step 5. If the computer determines that the actual detection time has reached the preset detection time, then proceed to step 4; the preset detection time is the sum of the solenoid valve's energizing time M and de-energizing time N, where M ≥ 2 min and N ≥ 2 min. Step 4: The computer determines whether the actual count of the counter within the preset detection time has reached the preset count. If the preset count has not been reached, the solenoid valve is qualified; if the preset count has been reached, the solenoid valve is unqualified. Step 5: The computer displays the test results of the solenoid valve, completing the oil droplet internal leakage test of the solenoid valve.

6. The method for detecting internal leakage of a solenoid valve based on a digital fiber optic sensor amplifier according to claim 5, characterized in that: In step 3, the preset reset time is 10 seconds.

7. The method for detecting internal leakage of a solenoid valve based on a digital fiber optic sensor amplifier according to claim 6, characterized in that: In step 3, M = N = 2min.

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