Overview of the highway continuous eight-round flatness meter:
In terms of electronic technology, the instrument adopts domestic good micro-processing and large-scale integrated circuit technology, which improves the integration degree of the whole machine and reduces the unnecessary connection of many connectors in the original instrument, thereby increasing the reliability of the system work. The performance of the whole system is more stable, and the internal single-CPU structure is responsible for displaying, printing, calculating, communicating, and collecting data; the data is sampled by the interrupt method, so that the measurement can be continuously performed without interruption. The distance is automatically calculated together. When measuring 1000 points of memory, the sampling interval is 0.1 m, and 25 km can be continuously measured.
The highway continuous eight-wheel flatness meter contains a real-time clock that displays the time and date and automatically records it. The display uses a 12-inch touch screen for Bluetooth wireless transmission. The controller is in the car, there is no battery, the controller is connected to the cigarette lighter, the heavy-duty frame can be set, save and print all the data, and the real-time measurement data can be realized on the actual road surface.
The highway continuous eight-round flatness meter is a good modern road surface flatness measuring instrument in China. It has the functions of continuous measurement, automatic calculation, display and printing of the square roughness of the road surface. Therefore, compared with the current three-meter ruler measurement and other similar measuring instruments, the instrument not only has the advantages of high measurement accuracy, high speed, reliable data, scientific evaluation, etc., but also simple operation, reliable work, and greatly reduced labor intensity and improvement. Work efficiency and economic efficiency. It is suitable for construction inspection and completion and road maintenance of roads, urban roads, plazas, airport runways and other roads. It can also provide reliable pavement analysis materials for teaching, design and scientific research units in the international <asphalt pavement construction and acceptance specifications> (GBJ02-86) and the Ministry of Communications "Conservation Technical Specifications" (JTJ073-85) re-listed this instrument as a standard measuring instrument. At the same time, the State Bureau of Technical Supervision approved the instrument as a national standard instrument, numbered (GB11816-89).
★由人工送数，可自动打印测试日期( 年 月 日)及被测路段编号(道路号、里程桩号、取样、超差)每打印一次，小结序号自动加一。
Technical features of highway continuous eight-round flatness meter:
Measurement function and accuracy
★ It can automatically measure, calculate and print the square error. The sampling interval is 0.05m and 0.1m, the sampling error is 0.04mm, and the test is repeated under the same condition, and the statistical deviation is less than 0.2mm;
★Manually send the number, can automatically print the test date (year month and day) and the measured road segment number (road number, mileage station number, sampling, out of tolerance) each time the print, the summary number is automatically added one.
★Automatically calculate and print the single item cumulative value H (unit: mm) of the measured road segment.
★Automatic detection calculation and printing The measured segment length value L (unit: m) error is less than 1%.
★Automatic measurement and printing of positive and negative tolerances (K+, K-). The standard of tolerance can be selected according to the grade of the road, and is limited to 1-15 (mm).
★ It can automatically measure and print the test speed value V (unit: km/h).
Traction method and detection speed
★Human or motor vehicle traction, A small turning radius of 5m, detection speed does not exceed 12km / h, non-detection situation (rack shortened, measuring wheel suspended) traction speed (25KM / H).
★Working environment temperature: (-10°C-+40°C)
★ Power and power consumption: gel-free maintenance battery, 6V7.2AH
★Dimensions: (length × height × width mm) 4061 × 800 × 600 Elongation: 4061mm; shortened: 2350mm;
★ Instrument weight: total weight 150kg, electronic instrument box 3kg
The structure of the highway continuous eight-round flatness meter:
The instrument consists of mechanical and electrical parts. The electrical parts are separately installed in the instrument box, and the two cables are displaced from the relevant parts of the frame.
Mechanical structure (see the figure below)
The mechanical part consists of the following parts:
★ Traction part: consists of connecting plug and tie rod, connected to the front axle through the nut;
★ Front axle:
★ Wheel: The motorcycle wheel formed with the eight pneumatic tires is formed by the front and rear structure;
★ Displacement sensor: contactless capacitive displacement measurement system;
★Main frame: including telescopic square tube, guiding structure, rear frame, etc.;
★Measurement wheel: It consists of pressure spring and lifting mechanism, rubber wheel and distance sensor;
★ Wheel frame:
★ shock absorption mechanism.
Electric charge part
The electrical part of the instrument is composed of 51 series micro processing as the core plus address locker, 32K data memory, program memory and other circuits;
Since the MCU itself is designed according to the requirements of the industrial test environment, its anti-interference performance is superior to the general-purpose microprocessor, which is very suitable for field work like highway measurement. The power supply is supplied by the gel-free maintenance battery. The various voltages required by the instrument are provided by the power supply through the DC/DC converter module and the precision voltage regulator circuit, which simplifies the hardware circuit and ensures the stability of the voltage. The output section is composed of a printer and a display device. The block diagram of the electrical components is as follows:
Road continuous eight-wheel flatness meter use precautions
★ Transportation, steering, parking and other non-measurement conditions must suspend the measuring wheel to avoid unnecessary wear and impact;
★ The test speed must be kept within 12km/h. If the road surface is not good, the speed should be slowed down accordingly, so as not to affect the measurement accuracy. Long-distance transportation should be installed in the transport compartment, short-distance transportation, can be directly used to pull the vehicle, but the speed should be less than 25km / h is appropriate to avoid excessive speed, vibration damage to the machine;
★The instrument box has been debugged when it is delivered. The user should not open the panel of the electrical box, and can not replace the original parts and welding wire, so as not to damage the instrument. Otherwise, the company will not repair it. If the line is faulty, please contact the company.
Maintenance and maintenance of highway continuous eight-round flatness meter:
★The instrument is powered by internal rechargeable battery. It can be used continuously for more than 20 hours after being fully charged (if the background light is turned off, the use time can be extended);
★Before each use, it should be fully charged (usually charged for about eight hours);
★When the instrument is in the monitoring state, if the battery is insufficient, it will display “Please charge!”, please charge it as soon as possible to avoid interruption due to insufficient power during work.
★ If the instrument is not used for a long time, it should be charged once every 2-3 months to ensure that the battery is not damaged.
★The flatness meter is a precision electronic instrument, such as sensors, computers, printers, etc. Do not expose to rain or moisture. When not in use, keep it in a safe place and energize it regularly to avoid damage;
★ The bearings and moving parts of the frame should be lubricated frequently to prevent rust and wear. Check that the connecting bolts are tight before and after use. Especially after long-distance transportation, it is necessary to check carefully;
★The wear of the measuring wheel will affect the accuracy of the measurement. Therefore, after driving enough mileage, check the diameter and replace it in time. In addition, the standard diameter of the measuring wheel is 159.2 mm;
★When the instrument cable is in use, it is easy to break due to improper use. At this time, the multimeter can be used to check the connection of the connection. The connection position of the cable connection is shown in the attached page. When troubleshooting, the disconnection must be melted. The welding is firm and the wires should not be touched to avoid affecting the use of the instrument.
★ Before use and after use, the displacement sensor rod should be wiped clean.
Common troubleshooting of highway continuous eight-round flatness meter:
The instrument consists of two parts: mechanical and electronic. The mechanical failures, such as the failure of the steering, the leakage of the tires, the damage of individual parts, are easy to check and find, and the general road use department has the ability to repair, as long as the inspection and maintenance, not Difficult to deal with in time. The electrical part, due to the use of a microcomputer, is technically complicated. Generally, the unit that uses simple faults should learn to eliminate it, and the troublesome fault should be sent to the production unit for inspection.
Road continuous eight-wheel flatness meter packing list:
1. Host: 1 set;
2. Displacement sensor: 1;
3. Photoelectric distance sensor: 1;
4, digital display controller: 1;
5, charger: 1;
6, displacement sensor (1 meter): 1;
7, distance sensor (1 meter): 1;
8, instructions: copies;
9. Certificate of conformity: 1 copy;
10, printer manual: 1 copy.