The original excavator was manual. It has been in existence for more than 130 years since its invention. During the period, it has been fully automated from steam driven bucket rotary excavator to electric drive and internal combustion engine driven rotary excavator. The progressive development process of hydraulic excavators. The first hydraulic excavator was invented by the Poclain plant in France. Due to the application of hydraulic technology, in the 1940s there was a suspended excavator equipped with a hydraulic backhoe on the tractor.
In 1951, the first fully hydraulic backhoe excavator was launched at the Poclain plant in France, creating a new space in the technical development of excavators. Trailer full-turn hydraulic excavators and crawler-type full hydraulic excavators were developed in the early and mid-1950s. The hydraulic excavator that was initially trial-produced is hydraulic technology using aircraft and machine tools. It lacks hydraulic components suitable for various working conditions of excavators. The manufacturing quality is not stable enough, and the supporting parts are not complete.
Since the 1960s, hydraulic excavators have entered the stage of promotion and vigorous development, and the number of excavator manufacturers and varieties in various countries has increased rapidly, and the output has soared. Between 1968 and 1970, hydraulic excavator production accounted for 83% of total excavator production, which is close to 100%.
Grow Light Led 600w, with 6pcs boards, each board 350pcs led, high power grow light works well for large area, such as grow tent, hydroponic, We have samsung LM301B/LM301H led, also Samsung 5730 led, meanwell driver/normal driver available here.
Application:
Quantum board LED grow lights is a great ideal for all kinds of indoor garden plants: lettuce, orchid, organic herbs, pepper, strawberries, succulent, hydroponic, medical plants.
Hydroponic Grow Lights,Full Spectrum Led Lights,Succulent Grow Light,Sun Lamp For Plants
Shenzhen Wenyi Lighting Technology Co., Ltd , https://www.wygrows.com