The method of correctly operating the pendulum friction coefficient tester:
1. Selection point: On the test section, follow the left wheel track in the driving direction, select five representative measuring points, each measuring point is about 5-10 meters apart.
2. Instrument leveling:
(1) Place the pendulum friction coefficient measuring instrument on the measuring point (see Appendix for calibration method), and make the swinging direction of the pendulum coincide with the driving direction.
(2) Move the pendulum to the right and press the release switch. Insert the snap ring into the release switch slot, the threshold is in the horizontal release position, then release the release switch, at which point the pointer should be pulled close to the pull tab.
(3) Press the release switch to move to the left, and the pointer should be zero. If you do not mean zero, you can tighten or loosen the felt ring adjustment nut slightly. Repeat this operation until the pointer points to zero.
3. Calibration slide length:
(1) Use a rubber brush to remove loose particles and debris from the road surface inside the swinging range.
(2) Let the pendulum hang from the mountain, set a standard ruler (126 mm) in the parallel direction of the external force of the rubber piece, loosen the solid handle, and turn the lifting handle. Slowly lower the swing. When the rubber sheet on the slippery block just touches the road surface, lift the lift handle to raise the slide block, move the pendulum to the right, and move the lift handle to lower the pendulum for a distance, then lower the lift handle to make the pendulum Slowly move to the left until the edge of the rubber sheet just touches the road, facing the end of the 126 mm ruler. Then lift the lifting handle by hand, lift the sliding block upwards, and move the pendulum to the left, lower the lifting handle, and then slowly move the pendulum to the right to make the rubber edge of the rubber piece touch the road again. After the distance between the rubber sheet and the contact point of the road surface should be 126 mm, tighten the fastening handle and correct it again. If the sliding length does not meet the standard, raise or lower the leveling screw on the front of the instrument base to correct it, but The leveling bubble must be leveled. Make the sliding length meet the requirements. After that, it will be placed in the horizontal release position.
4. Measurement: Sprinkle the road with water and scrape it with a rubber brush to wash off the slurry, then sprinkle the water, and press the release switch to slide over the road. The pointer can indicate the friction coefficient of the road surface. The first time you can not make a record). When swinging back, swing the swing lever with your left hand, lift the lifter with your right hand to raise the slide block, and move the pendulum to the right. Press the switch to put the swing ring into the release switch and set the swing pin to the close Dial the needle, repeat this item, measure five times (should be sprinkled each time), and record the value of each time. If the difference between the five times is not more than three units (one half of the dial), if the difference is greater than three units, the cause should be checked and the above operations should be repeated again until the requirements are met.
5, pendulum friction coefficient tester measurement results:
(1) The average value of the five measurement counts for each measurement point represents the friction coefficient value of the measurement point, and the average of the friction coefficients of the five measurement points is used. Represents the coefficient of friction coefficient of the measured section.
(2) Determine the reading, the reading of the pointer on the dial (referred to as “swing valueâ€), divided by 100, is the friction coefficient of the road surface. For example, if the value is 33, the friction coefficient is 0.33.
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