Actuating mechanism testing device

Abstract

The invention relates to an actuating mechanism testing device which comprises a shell and a panel, a first display screen, a second display screen and a knob are arranged on the panel, and a testing device power switch, an actuating mechanism power switch, a 24V power switch and a plurality of wiring terminals are arranged on the back face of the shell. A power supply circuit, a power conversion circuit, a signal generation device and a signal receiving device are arranged in the shell, the power supply circuit is externally connected with a 220V alternating current power supply, the power supply circuit converts 220V alternating current into 24V direct current through the power conversion circuit to supply power to the signal generation device, and the output end of the signal generation device is connected with the instruction signal input end of the execution mechanism. A feedback signal connecting end of the executing mechanism is electrically connected with the signal receiving device, an output current value of the signal generating device is displayed through the first display screen, and the signal receiving device converts a signal fed back by the executing mechanism into a current value and displays the current value through the second display screen. The device can quickly detect whether the actuating mechanism is qualified or not.

Description

Technical Field

[0001] The invention relates to testing equipment, in particular to an actuator testing device. Background Art

[0002] Electric actuators are often used in automatic control systems. Electric actuators need to be functionally tested after purchase. The current practice is usually to install the actuators on site and then have them tested on site by testers. When testing, the testers manually input test signals to the actuators on site and manually measure the feedback signals of the actuators. This test method is cumbersome to operate and slow to test. If the actuator fails the test, it needs to be disassembled and returned to the original manufacturer, which is bound to cause a waste of manpower and material resources. Summary of the invention

[0003] The present invention designs a testing device with simple structure and compact size for an actuator powered by 220VAC and 50Hz, which can quickly detect whether the actuator is qualified after delivery.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: An actuator test device comprises a shell and a panel. The panel is provided with a first display screen, a second display screen and a knob. The back of the shell is provided with a test device power switch, an actuator power switch, a 24V power switch and a plurality of wiring terminals. The inside of the shell is provided with a power circuit, a power conversion circuit, a signal generating device, a signal conversion device and a signal receiving device. The power circuit is externally connected to a 220V AC power supply. The power circuit converts the 220V AC power into 24V DC power to supply power to the signal generating device through the power conversion circuit. The signal conversion device is connected to the output end of the signal generating device. The signal generating device inputs a command signal to the actuator. The signal generating device outputs a 4mA-20mA analog signal. The feedback signal connection end of the actuator is electrically connected to the signal receiving device. The output current value of the signal generating device is displayed through the first display screen. The signal receiving device converts the signal fed back by the actuator into a current value and displays it through the second display screen. A multi-turn potentiometer is installed on the knob. The output current of the signal generating device can be adjusted by rotating the knob. The knob is divided into two modes: coarse adjustment and fine adjustment. The two modes can be switched by pressing the knob.

[0005] The test device designed by the present invention has a small size, a simple structure, and is easy to carry. Functional testing can be performed without installing the actuator in place. It is only necessary to connect the power cord, the command signal input terminal, and the feedback signal output terminal of the actuator to the corresponding wiring terminals of the test device respectively. The actuator can be tested through the signal generating device inside the test device, and the input and feedback currents can be displayed on the display screen of the test device respectively. The current change can be observed intuitively, making the test results clear at a glance. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a principle block diagram of the connection between the test device and the actuator in the embodiment; Figure 2 It is a schematic diagram of the external structure of the test device; Figure 3 This is a schematic diagram of the switch and terminal structure on the test device.

[0007] Description of Figure Numbers: 1. Housing; 2. Panel; 3. First display screen; 4. Knob; 5. Second display screen; 6. Test device power switch; 7. Actuator power switch; 8. 24V power switch; 9. Terminal block; 10. Terminal block. DETAILED DESCRIPTION

[0008] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0009] This embodiment discloses an actuator test device, which mainly performs functional tests on actuators with the following parameters: input and output of 4-20mA analog signals, powered by 220V AC, 50Hz. The entire test device is a cabinet structure with a small size. Figures 1 to 3 As shown, the external structure includes a shell 1 and a panel 2. The surface where the panel 2 is located is the front of the test device. The panel 2 is provided with a first liquid crystal display screen 3, a second liquid crystal display screen 5 and a knob 4. The back of the shell 1 is provided with a test device power switch 6, an actuator power switch 7, a 24V power switch 8 and a plurality of wiring terminals. The inside of the shell 1 is provided with two groups of wiring terminal rows, namely, a wiring terminal row 9 and a wiring terminal row 10, and each group of wiring terminal rows corresponds to a plurality of wiring terminals. The inside of the shell 1 is provided with a power supply circuit, a power conversion circuit, a signal generating device, a signal conversion device, and a signal receiving device.

[0010] Among them, the test device power switch 6 is connected to the A1 and A2 terminals in the terminal block 9, the actuator power switch 7 is connected to the A3 and A4 terminals in the terminal block 9, the 24V power switch 8 is connected to the A5 and A6 terminals in the terminal block 9, the actuator power line is connected to the A7 and A8 terminals in the terminal block 9, the actuator command signal line is connected to the B7 and B8 terminals in the terminal block 10, and the actuator feedback signal line is connected to the B9 and B10 terminals in the terminal block 10.

[0011] Connect the test device to an external 220V AC power supply. Close the test device power switch 6 to supply power to the components inside the test device through the power circuit. Close the actuator power switch 7 to supply power to the actuator through the power circuit. A signal generating device is provided inside the housing 1. After closing the 24V power switch, the power circuit converts the 220V AC power into 24V DC power through the power conversion circuit and supplies power to the signal generating device. The signal generating device can output a 4-20mA current signal through the signal conversion device. The signal generating device is equipped with a polarity protection circuit and a power reverse connection protection circuit to avoid burning components. A multi-turn potentiometer is installed on the knob 4. The output current of the signal generating device can be increased or decreased by rotating the knob 4. The knob 4 is divided into two modes: coarse adjustment and fine adjustment. The two modes can be switched by pressing the knob 4, and the fine adjustment is smooth.

[0012] The current signal output by the signal generating device is provided to the actuator as a command signal, and the magnitude of the output current of the signal generating device is digitally displayed on the first display screen 3. The actuator starts to act after receiving the current signal command, and adjusts the opening of the actuator according to the provided milliampere number. The actuator feeds back an actuator output signal to the test device, and the signal receiving device in the test device receives the actuator output signal, and digitally displays the received output current magnitude on the second display screen 5 through signal conversion. The tester only needs to observe the change of the current value on the first display screen 3 and the second display screen 5, and compare the digital deviation between the two to check the accuracy of the actuator adjustment, so as to judge whether the actuator is qualified.

[0013] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An actuator testing device, characterized in that: It includes a shell and a panel. The panel is provided with a first display screen, a second display screen and a knob. The back of the shell is provided with a test device power switch, an actuator power switch, a 24V power switch and multiple wiring terminals. The inside of the shell is provided with a power circuit, a power conversion circuit, a signal generating device, a signal conversion device and a signal receiving device. The power circuit is externally connected to a 220V AC power supply. The power circuit converts the 220V AC power into 24V DC power to power the signal generating device through the power conversion circuit. The signal conversion device is connected to the output end of the signal generating device. The signal generating device inputs a command signal to the actuator. The signal generating device outputs a 4mA-20mA analog signal. The feedback signal connection end of the actuator is electrically connected to the signal receiving device. The output current value of the signal generating device is displayed through the first display screen. The signal receiving device converts the signal fed back by the actuator into a current value and displays it through the second display screen. A multi-turn potentiometer is installed on the knob. The output current of the signal generating device can be adjusted by rotating the knob. The knob is divided into two modes: coarse adjustment and fine adjustment. The two modes can be switched by pressing the knob.

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