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Common faults in hydraulic system of concrete mixer truck Time: 2014-08-18 Source: http://
1 Use of hydraulic drive system In the various systems of the ç ¼ mixer truck, the hydraulic system is the most important and finest working part, which is especially important for its use and maintenance. The hydraulic motors, hydraulic oil pumps and reducers used by the mixers produced by various domestic manufacturers are mostly imported parts. The working principle of the hydraulic system of the ç ¼ mixer truck is shown in Figure 1. When the variable rod is rotated to the left by the operating device, the oil pump starts to drain oil from the oil port A, enters the motor through the high pressure oil pipe, the motor rotates, the oil flowing through the motor becomes low pressure oil, and flows from the B port through another high pressure oil pipe. Return pump. The larger the angle of rotation of the variable rod, the more oil is discharged per revolution of the oil pump, and the higher the rotational speed of the motor. When the variable stalk is manipulated to rotate to the right, the pressure oil is discharged from the B port, the motor rotation direction is changed, and the low pressure oil flows back from the A port to the oil pump. The rotation of the motor drives the reducer, so that the mixing drum of the mixer can be continuously variable in a certain speed range and has two kinds of directions. The principle of other hydraulic systems is the same. In order to make the hydraulic system work efficiently and trouble-free, it is necessary to strengthen the maintenance in daily use, and strictly follow the instructions of the manual, and replace the hydraulic oil and auxiliary devices (mainly filters) in time. Pay attention to the following points during the oil change process. 1) Use hydraulic oil with performance parameters that meet the requirements. Never use filtered or precipitated hydraulic oil. 2) It is best to use an oil filter with a filtration accuracy of 10 when refueling. 3) The main system, pump, motor housing should be filled with hydraulic oil before starting. 4) The user should use the hydraulic oil and filter element recommended by the manual for the first time using the 500 and the hydraulic oil and filter element every 2000h. At the end of December 2004, a certain user in the Yantai area had a very small amount of water in the process of changing the oil in the mixer truck. As a result, the mixer did not run under low temperature in winter. When he drove the mixer to our company for repair (about 1 hour on the road), the mixer's mixing drum was able to run normally. This is mainly because the water freezes in the oil pump and blocks the valve port. After a long time of driving, the ice in the pump melts and the pump can work normally. We did not have the above problems after replacing all the hydraulic oil of this car. It can be seen that the added hydraulic oil must ensure its quality, otherwise it will cause unnecessary failure and economic loss.
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