Description
Hydraulic excavator is the main machinery in mechanical engineering, it is widely used in engineering construction, construction road, hydraulic engineering, national defense works and other earthwork construction and mining operations.At present, small and medium-sized excavators are almost all hydraulic transmission.Compared with mechanical excavators, hydraulic excavators have the advantages of small volume, light weight, flexible and convenient operation, large digging force, easy to realize overload protection and remote control.In recent years, the application of high and new microelectronics technology in hydraulic technology has made the comprehensive technical level of construction machinery and construction machinery higher and higher, which has improved the reliability, safety, comfort and service life of these machines and made them more adaptable.
The experimental project
1. Observe the structure and working principle of the components of hydraulic transmission, and conduct disassembly and assembly experiments.
2. Hydraulic excavation machinery demonstration and control experiment.
3. PLC software simulation demonstration and control experiment.
4, programmable logic controller (PLC) electrical control experiment: machine-electric-liquid integrated control experiment.
The experiment content
1. Hydraulic excavation machinery demonstration and control experiment
1) excavation operation, bucket and bucket bar compound work experiment;
2) rotating operation, moving arm lifting and platform rotating at the same time;
3) unloading operation, the position height of the big arm can be adjusted at the same time when the bucket and bucket work;
4) return to the starting position of excavation with the platform rotation, movable arm and bucket bar.
2. Programmable logic controller (PLC) electrical control experiment: machine-electric-liquid integrated control experiment.
1) PLC instruction programming and ladder diagram programming learning;
2) learning and using PLC programming software;
3) communication and online debugging between PLC and computer;
4) application of PLC in hydraulic transmission control and optimization of control scheme.
Performance and features
1. The experimental bench is made of cold-rolled steel plate (which is sprayed with plastic and treated with anticorrosion). The bench structure is integrated with the control and operation.
2. The electrical operation control is down-mounted, and the hydraulic station is placed in the main cabinet of the hydraulic platform.The overall structure is compact, coordinated, elegant and practical, which can be used for 4-6 people.
3. Excavate the full metal structure of the machine in proportion to the real object. During the experiment, start the hydraulic system to operate the machine according to the requirements of the experiment.
4. The excavating machinery is made according to the structure and scale of the real object, which can truly reflect the actual working conditions of the machinery, so that students can have a deep understanding of the structure and working principle of each part of the mechanism in the experiment.
5. Manual control and automatic control are adopted for experimental control.
6. The test parts are made of pressure-resistant rubber hose, and the pressure can reach 25Mpa.
7. With three-phase leakage protection and output voltage of 380V/220V, the power supply will be cut off if the leakage current to earth exceeds 30mA;The electric control adopts dc 24V power supply with overvoltage protection to prevent the equipment from being damaged by wrong operation.
