Hard hat lateral stiffness tester operation instructions

Steps

1. Turn on the power. Set the "time" on the panel to 30 minutes.

2, according to the height of the side of the hat, use the hand wheel to lift the lower plate to a suitable position, place the prepared helmet on the side between the two flat plates, with the brim on the outside and as close as possible to the flat plate, and then gently turn the hand wheel through The upper and lower plates pressurize the helmet, applying a force of 30 N in the vertical direction of the plate, and pressing the “time start” button at the same time, holding for 30 seconds, and recording the length value Y1 after 30 seconds.

Then load at 100N/min up to 430N, hold for 30s, record the length value Y2 at this time after 30s.

Then, the load was reduced to 25 N at a speed of 100 N/min, and the load was immediately increased to 30 N at a speed of 100 N/min for 30 seconds, and the length value Y3 was recorded after 30 seconds. Press the "Timer stop" button to clear the timer.

3. Record the possible damage phenomena. Calculate the difference between Y2 and Y1 as the maximum deformation. Calculate the difference between Y3 and Y1 as the residual deformation. The measured value should be accurate to 1mm.

4. At the end of a test, continue to repeat steps 3-4. If you do not need to continue the test, turn off the power switch and unplug the power plug.

Precautions

1, force instrument description : In the measurement state, press

The key performs real-time measurement of the switching between the force value and the maximum force value; if the total value does not exceed the set clear range, and the measured value does not change, press 2 seconds to return to zero; press and release, within 2 seconds Press to release, remove the maximum value of the previous test after 2 seconds.

2. Description of displacement instrument : In the state of measurement, long press can clear, that is, position is zero at this time. You can define zero anywhere. After the zero point is defined, the lower plate moves upwards to a positive value and downwards to a negative value. Positive and negative values ​​are defined relative to the zero point. Mathematical operations can be performed directly and the absolute value of the resulting value is the relative distance between the two plates.

3, the instrument storage must be strictly prohibited fireworks, eliminate fire.

4. Please wear labor insurance products correctly during the test to avoid stabbing injuries.

5, the instrument power supply must have a reliable grounding line.

6, is strictly prohibited over-range use of equipment.