The principle of tearing and general adjustment instructions of the fabric tearing instrument

​Fabric tear tester It is suitable for measuring the tear resistance of various machine-related materials. It can also be used to measure the tear strength of thick paper, plastic cloth, electrical tape, etc. Applicable standard GB/T3917.1 “Impact pendulum method for determination of fabric tearing”.

The tearing principle of the fabric tearing instrument consists of main components such as machine base, support base and sector-shaped hammer. A rectangular sample is clamped between the movable clamp and the fixed clamp. A cut is made in the middle of the sample with a ripping knife. The fan-shaped hammer allows you to fall freely. The movable clamp is quickly separated, causing the sample to be forcibly torn apart.

Instructions for adjusting the fabric tearing instrument:

1. Adjust the foot screws so thatuntil the water bubble of the horizontal bubble is in the center of the horizontal bubble.

2. Clamp the sample and tilt the tearing knife handle. The length of the sample incision should be 20 mm ± 0.2 mm. If the cutting length does not meet the requirements, the blade position should be adjusted until it meets the requirements.

3. Place the hammer in a fan shape, temporarily place a pointer 25mm to the right of the braking point (it can be replaced by bending a thin steel wire, do not rub it against the fan-shaped hammer). hammer), then remove the instrument pointer \"Outside the 0 position\", when the anti-loosening handle is tilted, the sector hammer baffle is depressed, allowing the sector hammer to swing freely. Observe its attenuation in twenty cycles. The amount must not exceed 25 mm. Otherwise, add engine oil to the bearing to make it flexible.

4. When the sector hammer is in the vertical position, move the pointer to the left side of the pointer bezel, lift the non-slip handle to allow the sector hammer to swing freely, and hold it gently with your hands when the sector hammer swings back. . , does not let If the pointer is disturbed, it must stop at the zero position.

5. If there is any deviation, adjust the pointer adjustment screw, then repeat the above method until the pointer is correctly aligned with the “0” position.

6. When the instrument is moved and the weighing hammer is replaced, the zero position must be recalibrated.

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