Determination of the technical condition of hydraulic vibratory rollers

Abstract: Hydraulic vibratory rollers are widely used in road and bridge engineering construction. The good technical condition of them plays an important role in the quality and progress of the project. This article introduces hydraulic vibratory rollers

The methods for determining the technical conditions of each major system.

The roller is an indispensable compaction equipment in road and bridge engineering construction. The technical condition of the roller will directly affect the quality and progress of the project. A comprehensive understanding of hydraulic rollers that have been in use for a certain period of time and an assessment of their technical conditions are the prerequisites for managing and using them well. The technical condition of a hydraulic vibratory roller can be judged from the following aspects:

The main system for determining the technical condition of a hydraulic vibratory roller

(1) Engine (2) Hydraulic drive system (3) Hydraulic vibration system (4) Hydraulic steering system (5) Vibration wheel (6) Other systems

Among them, the engine, hydraulic drive system, hydraulic vibration system and vibration wheel are the main factors determining the technical condition of the hydraulic vibratory roller. The engine is the power source. The hydraulic drive system determines the driving power performance of the roller. The hydraulic vibration system and the vibration wheel determine the compaction capacity. The above four parts are also often the main cost points for the maintenance of hydraulic vibratory rollers.

2 Engine

The technical condition of an engine mainly depends on its power performance, lubrication performance and heat dissipation performance. The power performance ensures that the engine has sufficient power output. The lubrication performance ensures good lubrication inside the engine and guarantees its normal operation. The heat dissipation performance ensures that the engine's heat is removed in a timely manner, allowing it to operate normally.

2.1 Determination of Engine Power Performance.

The determination of engine power performance can be made by measuring the power output performance of the engine with a dynamometer. However, if most construction enterprises do not have dynamometer instruments, the power performance of the engine can be judged by measuring the compression force of each cylinder of the engine, oil consumption and engine exhaust, etc.

Cylinder compression pressure

Measure the cylinder compression pressure of each cylinder of the engine respectively. If the cylinder compression pressure of each cylinder is within the standard value of the engine, it indicates that the sealing performance of the engine cylinder liner, piston, piston ring and exhaust valve and other sealing components is good, and the engine power performance is good. If the cylinder pressure is too low, it may be due to wear of components such as the piston, cylinder liner, and piston rings, or poor sealing of the intake and exhaust valves, which leads to a decline in the engine's power performance.

(2) Determination of oil burning

Severe oil burning in the engine indicates poor sealing performance of components such as the piston rings, pistons, and cylinder liners. Maintenance is necessary to restore the engine's power performance. Engine oil burning can be determined by observing the engine's exhaust or by measuring the engine's oil consumption (under the premise that there is no oil leakage from the engine). If the engine exhaust is blue or the oil consumption is significantly excessive, it indicates that the engine is burning oil seriously. It is necessary to inspect and repair components such as the piston, piston rings, and cylinder liner.

(3) Engine air leakage

Observe the engine vent. If there is oil dripping from the vent, it indicates that the engine has severe air leakage and needs to be repaired. The problems that may exist in the above three aspects of the engine do not necessarily occur separately. If the sealing mating pairs such as the cylinder liner, piston and piston ring of the engine are worn too much or the piston rings do not match, the problems in the three aspects may occur simultaneously.

(4) Determination of the valve train phase, fuel supply Angle, as well as the fuel supply system and intake system

If the cylinder pressure of the engine is normal, but there is obvious air leakage and oil burning, and its power output is significantly insufficient, it may be caused by an unsmooth intake system, incorrect valve timing, incorrect fuel supply Angle, or poor atomization of the diesel high-pressure fuel pump and fuel injector. Each of the above systems can be inspected respectively.

2.2 Determination of the technical condition of the Engine Lubrication System

The technical condition of the engine lubrication system can be determined by observing the oil pressure value when the engine is hot. If the engine oil pressure is greater than 1.5kg /cm ² when the hot engine is idling and reaches 2 to 4kg/cm ² during high-speed operation, the lubrication system (including the fit between the large and small bearing shells of the crankshaft and the crankshaft, as well as the fit between the eccentric wheel shaft and the eccentric bearing shells) can normally meet the lubrication requirements of the engine. If the engine oil pressure is lower than 1.0kg/cm ², it must be inspected. There may be the following reasons:

(1) The pressure limiting valve of the oil pump is adjusted too low.

(2) Leakage inside the oil pump;

(3) Excessive wear of the large and small bearing shells of the crankshaft and excessive fit clearance cause pressure relief.

(4) The clearance between the eccentric camshaft and the eccentric bearing bush is too large.

2.3 Determination of the technical condition of the Engine Cooling System

The technical condition of the engine's cooling system can be determined by inspecting the engine oil temperature or the water temperature gauge. If the water temperature of a water-cooled engine remains below 100℃ and the oil temperature of an air-cooled engine remains below 130℃, then the engine cooling system is working properly. Otherwise, the engine cooling system is not functioning properly.