Road Marking Paint and Machine Manufacturer
+86-15668659958
operating instruction. Below is a video introduction
1.Say clearly
In the 21st century, the national transportation industry has flourished, and the national highway trunk line has been built thousands of miles a day. In order to meet the needs of highway construction and rapid development, our company The utility model relates to a series of high-tech products developed and produced jointly with relevant scientific research departments, among which is the pendulum friction coefficient measuring instrument used for road surface quality inspection, which can be used for high-grade highway, city road and airport runway anti-skid performance test to a new level and can be compared with similar products from abroad. One of the missing testing instruments.
II. Principles
The pendulum friction coefficient tester is a dynamic pendulum impact instrument. It is developed according to the basic principle that “the potential energy loss of the pendulum is equal to the work done to overcome the friction of the road when the rubber film at the end of the pendulum slips on the road surface”.
III. Structure (see photo)
1.Base: consists of T – leg, leveling screw and leveling bubble.
2. A column consisting of a column, a lifting mechanism, a guide rod, and an instrument handle, used for lifting and fixing the position of a swinging head.
3.Release Switch: A switch mounted on a cantilever to hold the pendulum horizontally and release the pendulum.
4. Steering system: includes fastening handles, swinging shafts, steering joints and bearings, hoisting, fixing position, guaranteed in The swinging plane can swing freely.
5. Coefficient system: including pointer felt ring, press cover, pointer adjust nut and dial, pointer can refer directly to The pendulum value is shown.
6, hammer head: by upper and lower joint, pendulum rod, spring, lever, lifting handle, hammer shell, slippage block and rubber film(76 mm ×25.4 mm ×6.35 mm) consisting of a specified torque on the swing center and a specified pressure on the pavement
Before and after, left and right torque balance, it is a measure of road friction coefficient.
The structure of the instrument is shown in Figure 1 below
7. Main technical parameters
1.Weight of pendulum:1500±30g center distance:410±5mm
2.Positive static pressure of rubber sheet on pavement:2263g
3.No less than 70 times the swing stops from 5°tilt freely.
4.The outer edge of the rubber sheet is 510 mm from the swing center.
8. Usage
Point selection: in the test section, along the driving direction of the wheel track, select representative five measuring points, each.
The distance between the measuring points is about 5 ≤ 10 m.
2. Instrument leveling:
Place the instrument on the measuring point and align the swinging direction with the driving direction.
(2) turn the leveling screw to center the leveling bubble
3. Zero:
(1) Calibrate the position of the pointer.
The wire is close, and the position indicated by the pointer should be aligned with the center position of the swinging rod. Otherwise, the regulating screw of the needle dipper should be adjusted.
The wire aligns the pointer with the center position of the swinging rod, and the nut on the adjusting screw should be tightened to fix it after adjustment
The pointer adjusts the position of the screw.
(2) relax the fixing handle, turn the lifting handle to raise the pendulum and swing freely, and then tighten the fixed handle.
(3) To move the pendulum to the right, press the release switch so that the positioning clasp enters the release switch slot and places the pendulum
Horizontal release position. At the same time, use the left hand to move the pointer so that it is close to the screw on the needle dipper.
(4) Press the release switch to move the pendulum to the left and drive the pointer up. Lower when the pendulum reaches its highest position.
When falling, use your left hand to catch the pendulum. At this time, the pointer should point to zero. If you do not refer to 00:00, you can slightly tighten or relax the pointer adjustment
Nut, repeat this item operation until the pointer points to zero.
4. Calibration of sliding length:
（1）Use a rubber brush to remove loose particles and debris from the pavement.
(2) allow the pendulum to hang freely, align the middle of the ruler with the swing rod, and make the sliding ruler parallel to the test direction andClose to the rubber sheet.
(3) relax and fix the handle, turn the lifting handle so that the pendulum drops slowly and lift the handle with the right hand at the same time to make the pendulumMove to the right, drop the slider at the right end of the ruler to align it with the road surface and line the ruler, then lift the lift The handle moves the pendulum to the left and lowers the slider at the left end of the ruler so that it contacts the road surface and is level with the line at the left end of the ruler.
Then tighten the handle and check the sliding length. In this process, the sliding length can be slightly reduced with a leveling screw Adjust the sliding length to 126±0.5 mm.
Measure: Sprinkle the road with water and brush it with an eraser to remove the mud. Then sprinkle and press. Record). When swinging to the right, hold the swinging rod with your left hand, lift the lifting handle with your right hand to raise the slippage block, and place the pendulum
Move to the right, position the clasp into the release switch, repeat 1-5, determine five times (water should be sprinkled each time). Record the values of each time. The difference of five times is not greater than three units. If the difference is greater than three units, the yield should be checked. Reasons for birth. Repeat the above procedures until the requirements are met.
5. Determination results
(1) The average of five measured readings for each measuring point represents the pendulum of the measuring point and the pendulum of the five measuring points The average value of the measured section of the road.
(2) Measured reading, i.e. the reading of the pointer on the dial divided by 100, i.e. pavement
Coefficient of friction. For example, if the pendulum value is 33, the friction coefficient is 0.33.
6. Points to note
(1) because the friction coefficient of pavement is affected by season and temperature, the test date and wet pavement should be recorded.Temperature.
(2) the test section should describe the type, appearance and service life of pavement structure.
When swinging to the left, make sure you catch the lever with your hand to avoid damaging the slider and pointer.
- there should be no significant convex and concave shapes in the effective range of rubber film sliding on the slip block so as not to affect the impact.Measured values
(5) When calibrating the sliding length, the rubber sheet shall have just touched the pavement and shall not be used to slide forward by the force of the pendulum To avoid errors in the calibrated sliding length.
(6) The road friction coefficient varies along the cross section of the road. Usually the road is small and large. In the most unfavorable case of the road section, we should choose the position where the friction coefficient is small and the brakes are used more frequently, that is, along the driving direction.At the left wheel trail.
（7) When using new rubber film on the slide block, it should be tested 10 times on the dry road surface and then 20 times on the wet road surface before application. The long edge of the rubber sheet shall not exceed 3.2mm. The short edge shall not exceed 1.6mm.
Replace the rubber sheet with a new one(see Fig. 2 for details). In addition, the rubber sheet cannot be used after being contaminated with oil. Rubber sheet.
The term of validity shall be one year and shall not be used for determination after one year, regardless of whether it has been used or not. ylation, elasticity, hardness are all changed, affecting the test results.
7. Maintenance, maintenance and transportation of instruments
1. The pendulum friction coefficient tester is a precision instrument, so attention must be paid to protecting its various parts of the mechanism so as not to affect the instrument.If you are not familiar with the structure of the instrument, you should read the instructions carefully before using them The structure, function and operation method of the part shall not be casually except for the licensed activities on the instrument or the part of the object removed.Dismantling instruments
2.When the instrument is finished, wipe all parts clean and put into the box. The instrument should be dry and ventilated, free of acid and
A room in which corrosive volatiles are present.
3. The instrument shall be placed or moved in the packing box except in the course of testing or in other special circumstances.The instruments should be loaded into the transport box for long – distance transportation.
(1) the pendulum should be calibrated at least once a year, and if there is any important damage or change, it should be calibrated in time. The calibration of the pendulum,
It can be sent back to the original factory for calibration, and the user can also calibrate it himself.
(ii) Assembly Box list:
1.One mainframe
2.A storybook.
3. Certificate of qualification
4.126 mm ruler (1)
5, rubber brush (1)
6.sprinkle kettle
Our company is a professional manufacturer of road hot-melt coatings, road retroreflective measuring instruments, and road marking machines. If you are interested, please feel free to communicate with me via email at any time export@toproadtraffic.com
