Safety helmet lateral rigidity tester operation manual

ZM-812 helmet lateral rigidity tester
Operation manual
Article from Qingdao Zhongbang Instrument Co., Ltd. Technology Department
Steps
1. Turn on the power. Set the Time on the panel to 30 minutes.
2. Raise the lower plate to the appropriate position according to the height of the side of the hat. Place the pre-prepared helmet on the side between the two plates, the cap is outside and as close as possible to the plate, then gently turn the handwheel to pass The upper and lower plates pressurize the helmet, apply a force of 30 N in the vertical direction of the plate, and quickly press the "time start" button for 30 s, and record the length value Y1 after 30 s.
Then, it was loaded at a speed of 100 N/min up to 430 N for 30 s, and the length value Y2 at this time was recorded after 30 s.
Then reduce the load to 25N at 100N/min, then immediately increase the load to 30N at 100N/min for 30s, and record the length value Y3 after 30s. Press the “Timer Stop” button to clear the timer.
3. Record possible damage phenomena, calculate the difference between Y2 and Y1 as large deformation of zui, calculate the difference between Y3 and Y1 as residual deformation, and the measured value should be accurate to 1mm.
4. At the end of one test, repeat the steps 3 to 4 to continue the test. If you do not need to continue the test, turn off the power switch and unplug the power cord.
Precautions
1. Force value meter description : When measuring state, press
Description: 03
The key performs the switching between the real-time measured force value and the Zui's vigorous value; if the total value does not exceed the set clearing range and the measured value does not change, press
2 seconds to return to zero; press
Description: Dots
Release later, press again within 2 seconds
Description: 04
Do not release, after 2 seconds, clear the large value of the last test. 2, displacement meter description : in the measurement state, long press
Can be cleared, that is, the position is zero at this time.
You can define any position to be zero.
After the zero point is defined, the lower plate moves up to a positive value and moves down to a negative value. The positive and negative values ​​are defined relative to the zero point. The mathematical operation can be directly performed, and the absolute value of the obtained value is the relative distance between the two plates.
3, the instrument storage should be strictly prohibited fireworks, put an end to the fire.
4. Please wear labor insurance products properly during the test to avoid stabbing your hands.
5, the instrument power supply must have a reliable grounding wire.
6. It is strictly forbidden to use the instrument in over-range.

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