Comprehensive class of excavators: the semester lasts for one and a half months, and it studies the safety operation, long arm operation, river dredging, hammer breaking, lifting tractor and other maintenance technologies of world-famous excavators such as Carter, Volvo, Komatsu, Hitachi, Sumitomo, Kobelco, Hyundai and Daewoo. Total cost: 4460 yuan.
Excavator maintenance class: the semester lasts for three months, learning the working principle of excavators and loaders, and the maintenance technology of hydraulic, transmission, machinery and circuit systems. Total cost: 9980 yuan.
Another is to ask the master to take you to the construction site. After learning, you can get the certificate by using the resources of the construction site without spending much money.
Excavator history:
At first, the excavator was manual, and it has been more than 30 years since its invention to 20 13. During this period, it has experienced a gradual development process from steam-driven bucket rotary excavator to electric-driven rotary excavator and internal combustion engine-driven rotary excavator, and then to fully automatic hydraulic excavator with electromechanical and hydraulic integration technology. The first hydraulic excavator was successfully invented by Boquelin Factory. Due to the application of hydraulic technology, in the 1940s, there appeared a hanging excavator equipped with a hydraulic backhoe on tractors. 195 1 year, the first full hydraulic backhoe excavator was launched by Poquelin factory, which opened up a new space in the field of excavator technology development. In the middle and early 1950s, traction hydraulic excavator and crawler hydraulic excavator were successfully developed. The original trial-produced hydraulic excavator used the hydraulic technology of aircraft and machine tools, and lacked hydraulic components suitable for various working conditions of the excavator, so the manufacturing quality was not stable enough and the supporting parts were not complete. Since the 1960s, hydraulic excavators have entered the stage of popularization and vigorous development, and the manufacturers and varieties of excavators in various countries have increased rapidly, and the output has soared. During the period of 1968- 1970, the output of hydraulic excavators has accounted for 83% of the total output of excavators, which is close to 100%.
The first generation of excavators: the emergence of electric motors and internal combustion engines made excavators have advanced and applicable electric devices, so various excavator products were born one after another. 1899, the first electric excavator appeared. After World War I, diesel engines were also used in excavators. This kind of mechanical excavator driven by diesel engine (or motor) is the first generation excavator.
The second generation excavator: With the wide application of hydraulic technology, excavators have more scientific and applicable transmission devices, and hydraulic transmission instead of mechanical transmission is a great leap in excavator technology. The first hydraulic excavator in Germany was born in 1950. Hydromechanical transmission is the second generation excavator.
The third generation excavator: The wide application of electronic technology, especially computer technology, makes the excavator have an automatic control system, and also makes the excavator develop in the direction of high performance, automation and intelligence. The germination of mechatronics took place around 1965, and the electromechanical integration technology was adopted on the hydraulic excavator mass-produced around 1985, and the main purpose at that time was to save energy. Electric excavator is the symbol of the third generation excavator.