What should I do if the rubber tension meter suddenly drops in speed during the test?
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In the following, we use a rubber tension meter with a maximum range of 5000N as an example. During the normal test of the equipment, when the pulling force increases to 2500 N, the drawing speed suddenly decreases, and this phenomenon repeats continuously.
First, the failure analysis:
1, according to the device working properly in the 2500N below, indicating the main loop and control circuit, the mechanical part is normal.
2. For nearly 2500N, the drawing speed suddenly decreases, and we combine the electrical control principle of the device.
3. With the elongation of the test sample, its tensile force increases, and the motor current also increases, requiring a corresponding increase in the motor terminal voltage.
4. If the motor terminal voltage is not increased, the motor will decelerate due to heavy loads until it stops.
5. The control signals for controlling the motor terminal voltage are positive current feedback and negative velocity feedback.
6. On the Other hand, if the motor current is too high, in order to protect the motor from over-current damage, the current cut-off negative feedback signal will force the motor to stop rotating.
Second, the fault processing 1, first check the positive current feedback resistor and the current cut-off negative feedback resistor;
2, then set the tensile speed to 4mm/min, when doing pull test;
3. Check that the terminal voltage of the DC motor increases as the pull force increases, indicating that the electrical control part is normal;
4. When the pulling force reaches 2500N, the speed suddenly drops; adjust the positive feedback potentiometer after shutdown;
5. If the failure phenomenon is not tested again, it can be concluded that the current cut-off negative feedback signal makes the motor speed decrease, indicating that the midpoint of the original potentiometer changes due to long-term use of the equipment;
6, adjust the current cut-off negative feedback potentiometer, after the start of the test, the failure is ruled out.
What should I do if the tensile speed of the rubber tension meter suddenly drops during the test? The above causes of failures and how to deal with them, we all know! Haida Instrument has long been engaged in the development and production of hydraulic universal testing machines, furniture testing equipment, carton compression testing machine, constant temperature and humidity testing chamber, aging testing machine equipment.
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