1、 Classification of rollers
Road rollers can be divided into light, small, medium, heavy and super heavy according to the scope of work quality. According to different compaction principles, road rollers can be divided into static action type, vibration type and impact type. According to the structural type of compaction wheel, the roller can be divided into smooth wheel type, bump (sheep foot roller) type and tire type. According to the compaction wheel combination type, the roller can be divided into tire smooth wheel combination type, vibration oscillation combination type, etc. According to the action form of compaction wheel, vibratory roller can be divided into vibratory type, oscillating type and vertical vibratory type.
2、 Operating skills and knowledge points of roller
When the roller moves forward or backward, first test whether the foot brake is sensitive. Note: when stepping on the foot brake, do not apply too much force. Be careful not to forget to step on the clutch first. Turn the steering wheel and test whether the hydraulic steering gear is reliable in place. Pull back the engine throttle handle to make the engine reach speed. When changing speed or reversing, the roller shall first reduce the engine speed to reduce the speed of the roller; When changing speed or shifting forward, the main clutch must be pressed, otherwise the gear will be worn or broken early. Then gently push or slightly shift or reverse the handle until the gear is meshed.
3、 Roller rolling skills
Whether rolling uphill or downhill, the driving wheel of the roller should be behind. This has the following advantages: when going uphill, the driving wheel behind can bear the driving force provided by the ramp and the machine itself. At the same time, the front wheel preliminarily compacts the road surface to bear the large shear force generated by the driving wheel; When going downhill, the impact force generated by the self weight of the roller is offset by the braking of the driving wheel. Only the mixture rolled by the front wheel has the ability to support the rear driving wheel to generate shear force.
4、 Selection skills of roller
If you want to obtain uniform compaction density, you can choose a tire roller. When rolling, the tire roller does not destroy the original viscosity of the soil, and there is good bonding performance between each layer of soil. In addition, the front wheel can swing, so the compaction is relatively uniform and there will be no false compaction. If you want to compact and level the road surface, you can choose a driven roller. In case of long-term operation in the place of subgrade compaction, dynamic compaction or impact roller shall be selected. In order to achieve the compaction effect as soon as possible, large tonnage roller can be selected to shorten the construction period.
5、 Troubleshooting of common roller faults
Air removal method of fuel pipeline: the diesel engine of the roller stalls due to the lack of diesel in the oil tank during use. After the diesel engine is shut down, although diesel is added to the oil tank, air has entered the diesel pipeline at this time, and the oil supply cannot be restored by using the hand oil pump.
In order to eliminate the air in the diesel pipeline and make the diesel engine start smoothly, we take the following methods: first find a small basin and fill it with quantitative diesel, and place it slightly higher than the diesel pump; Secondly, remove the diesel pipe connecting the oil tank to the hand oil pump and put it into the diesel in this small basin; Thirdly, pump the diesel oil with the hand pump, remove the air in the low-pressure oil circuit, reinstall the diesel pipe connecting the oil tank to the hand pump, and then test the engine. The diesel engine starts normally.
6、 Roller maintenance knowledge points
Gearbox maintenance: the gearbox shall be cleaned at least once a quarter. When cleaning, first stop the vehicle in a hot state, unscrew the oil drain plug on the side of the gearbox, drain the lubricating oil in the gearbox, then screw on the oil plug, fill the gearbox with kerosene, start the diesel engine, run the gearbox at low speed for 2-3 minutes, stop the vehicle, drain the kerosene, clean the oil plug and screw it onto the gearbox, (Note: the kerosene must be cleaned to avoid the loss of lubricating fruit due to the mixing of lubricating oil and residual kerosene), and then add new lubricating oil until the oil level reaches the mark line of the dipstick.