Treatment of Hydraulic System in Concrete Mixing Plant


Taking into account the hydraulic system installed power is too small, decided to add two concrete mixer power of 75KW motor pump, A11VO130 hydraulic control variable pump, while adding constant power control and the maximum pressure limit. This allows the output power of the original motor pump to be reduced to the maximum extent possible, while allowing the new motor pump to output the maximum power. Figure 1 shows the hydraulic system diagram after the transformation. In this figure, 1-15, respectively: fuel tank, the power of 75KW motor pump, the power of 132KW motor pump, the power of 0.75KW pilot pump, pilot control variable pump, relief valve, the proportion of decompression Valves, pressure gauges, check valves, proportional relief valves, pressure gauges, relief valves, electrohydraulic valve, model MX750 hydraulic motor, planetary gear reducer.
After the transformation, the stirring shaft speed of 8r / min, the use of hydraulic pump output flow calculation formula, a single new hydraulic pump output flow calculated to 159.6L / min; and then through the maximum input pump Power formula, a single new hydraulic pump to calculate the maximum input power, 64.2KW. At this time in the concrete mixer in the medium-speed running state, a separate start of the original equipment motor pump flow and power, the original equipment stirring shaft speed of 14r / min, a single original equipment, hydraulic pump output flow of 279.3L / min, The maximum output power of a single original hydraulic pump is 112.4KW. In the transformation of the electro-hydraulic control parameters to re-adjust, making the new motor pump the maximum output power of 64KW, and the original motor pump output power of 112KW, so that the original motor pump load to be effective Reduced, at the same time can be reserve, hydraulic vibration from the fundamental control, while the adjustment of the pump caused by the hydraulic shock and mechanical shock have been treated.
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