Highway continuous flatness meter

I. Overview
The road surface roughness meter adopts ARM microcomputer processing and large-scale integrated circuit technology, which improves the integration of the whole machine and reduces many unnecessary connectors in the original instrument, thereby increasing the reliability of the system work and making the entire system Performance is more stable. The instrument contains a real-time clock, which can display the time and date, and automatically record. The display uses a liquid crystal display method, which reduces power consumption and makes the display clearer. The displacement sensor adopts high-precision displacement sensor, with higher accuracy, better stability and faster testing speed. The power supply uses 12V7.2AH colloid maintenance-free battery, which replaces the traditional battery. In terms of machinery, on the premise of ensuring test accuracy, test accuracy and frame rigidity, the weight of the instrument is reduced as much as possible, making the transportation and loading and unloading of the instrument more convenient and flexible. Therefore, compared with the current three-meter ruler measurement and other similar measuring instruments, this instrument not only has the advantages of high measurement accuracy, fast speed, reliable data, and scientific evaluation, but also has simple operation, reliable work, and greatly reduces labor intensity and improves Work efficiency and economic benefits. It is suitable for the construction inspection, completion acceptance and road maintenance of roads such as highways, urban roads, squares, and airport runways, as well as the maintenance of roads. It can also provide reliable pavement analysis materials for teaching, design, and scientific research units. This instrument is re-listed as the standard measuring instrument in the national standard "Code for Construction and Acceptance of Asphalt Pavement" (GBJ02-86) and "Technical Specifications for Maintenance" (JTJ073-85) of the Ministry of Communications.

2. Main technical performance
Detection function and accuracy
1. The mean square error σ can be automatically determined, calculated and printed. There are two sampling intervals: 0.05m and 0.1m, and the sampling error is less than 0.04mm. Repeat the test under the same conditions, and the statistical deviation is less than 0.2mm.
2. The number is sent manually, and the test date (year, month and day) and the number of the tested section (road number, mileage number, pile number, road width number, out of tolerance setting, sampling interval) can be automatically printed every time, and the serial number is summarized. Automatically increase or decrease by one.
3. Automatically calculate and print the one-way cumulative value H (unit: mm) of the measured road section.
4. Automatically calculate and print the graphic area value S (unit: cm2) between the cross-section curve of the measured road section and the reference line.
5. Automatically detect and calculate and print the length value L of the measured road section (unit: m), the error is less than 1%.
6. Automatic measurement and calculation and printing of positive and negative tolerances (K +, K-). The usage of tolerances can be selected according to road grade requirements, limited to 1-15 (mm)
7. Automatically determine, calculate and print the test speed value v (unit: km / h).
(1) Traction method and detection speed
It can be towed by manpower or motor vehicles, the minimum turning radius is 5 m, the detection speed should be 6-8 km / h, and the maximum speed should not exceed 12km / h. Towing speed (25 km / h) under non-detected conditions (frame shortened, measuring wheels suspended).
Working environment temperature: -10 ℃ — + 60 ℃.
Power and power consumption: colloid-free maintenance battery, 12V7.2AH.

3. Structure Introduction
LXBP-6 flatness meter is composed of mechanical and electrical parts. The electrical part is installed separately in the instrument box, and a cable is connected to the interface of the displacement sensor and the distance sensor, which can be disassembled at any time. Mechanical structure The mechanical part consists of the following parts;

1. Traction part: It consists of connecting plug and tie rod, and is connected to the front axle through a nut.
2. Front axle.
3. Wheels: eight motorcycle wheels in the form of pneumatic tires are constructed through the front and rear.
4. Displacement sensor: FM inductive displacement measurement system.
5. Locking mechanism.
6. Main frame: including telescopic square tube, guide structure, rear frame, etc.
7. Measuring wheel: composed of pressurized spring and lifting mechanism, rubber wheel and distance sensor.
8. Rear axle.
9. Round frame.