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Three driving modes of manual hydraulic stacker
The drive system of the manual stacker truck needs to transmit large power, and the components are required to have higher efficiency and longer life. It is also expected to have good capabilities in variable speed regulation, changing the rotation direction of the output shaft and reverse transmission of power. Generally classified according to other transmission modes, it can be divided into mechanical transmission, hydraulic transmission, hydrostatic transmission, etc. The following is a comprehensive analysis of the three drive modes of the stacker truck and a comparison of their advantages and disadvantages.
1. Mechanical transmission
For electric stacker cars, mechanical transmission is generally adopted, and reducer, driver and other devices need to be configured. This transmission mode has the advantages of simple structure, low price, high transmission efficiency, low failure rate and convenient maintenance. But at the same time, there are also some shortcomings, such as large impact when starting, more parts, and difficult overall layout. The working condition suitable for the mechanical transmission system is quite different from the working condition of the stacker truck. The mechanical transmission system is not suitable for the working conditions of the stacker truck such as frequent speed change and reversing, loading and starting. The mechanical transmission parts and transmission mode of the stacker truck continue the transmission mode of the forklift truck without special research and specialized production. The adoption of this transmission mode will cause defects such as insufficient strength, easy wear and short service life of the parts.
2. Hydraulic transmission
Hydraulic transmission devices include hydraulic coupler and hydraulic torque converter. Hydraulic coupling is a kind of non rigid coupling. Hydraulic torque converter is essentially a torque converter, and the power transmitted by them is proportional to the 3rd power of input shaft speed change and the 5th power of impeller size. The transmission efficiency is high near the top working condition. At present, hydraulic transmission is widely used in various large and medium-sized construction machinery, communist military machinery and other vehicles that need frequent speed changes and meet strong changes. However, its characteristic matching layout mode is limited, the range of variation is small, and the braking capacity is poor. However, the space of the driving part of the stacker truck is very small, and the braking capacity is required to be high, so the hydraulic transmission system is not suitable for the stacker truck.
3. Hydrostatic transmission
The hydrostatic transmission system is mainly composed of hydraulic pump and hydraulic motor, so the rotating device is light in weight and small in size, which is convenient for the overall layout of the vehicle. Moreover, according to the different combinations of pumps and motors, the machinery can obtain different traction characteristics; It can easily realize the stepless speed regulation and inching form of the vehicle, so that the vehicle can start gently, and can quickly change the speed and change the driving direction without impact. The engine has good load characteristics at low speed. Even at low speed, the engine can exert the maximum traction, and it is easy to integrate machinery, hydraulics and electronics to achieve automatic control.
Because the working pressure of the hydrostatic transmission system is determined by the external load, it is easy to achieve the desired operating conditions. The stacker truck with hydrostatic transmission system has the advantages of simple structure, easy operation, small turning radius, flexible steering, good energy saving and low cost, which is a future development direction of stacker truck.