Excavator development overview (abroad)
It has been more than 130 years since the first manual excavator came into being. During this period, it has experienced the gradual development process from semi rotary excavator driven by steam to full rotary excavator driven by electric power and internal combustion engine, and fully automatic hydraulic excavator applying electromechanical hydraulic integration technology.
Excavators were produced earlier in developed countries, Since the 1980s, it has been producing super large excavators, such as The main production countries of single bucket hydraulic excavator with bucket capacity of 3.5-40 m3 are France, Germany, the United States, Russia, Japan, etc.
Made by Marion, USA Stripping excavator Bucket capacity is 50-150 m3, walking dragline excavator The bucket capacity is 132 m3 ；
Walking dragline excavator produced by B-E company The bucket capacity is 168.2 m³ ， Excavator for stripping The bucket capacity is 107 m³ It is the largest excavator in the world.
Since the late 20th century, the production of excavators in the world has developed in the direction of large-scale, miniaturization, multi-function, specialization and automation
1) To develop multi variety, multi-function, high quality and high efficiency excavators.
In order to meet the needs of municipal construction and farmland construction, foreign countries have developed micro excavators with bucket capacity below 0.25 m3, and the minimum bucket capacity is only 0.01 m³ 。 At the same time, the development of special purpose excavators, such as low specific pressure, low noise, underwater special purpose and amphibious excavator, etc. In addition, the largest number of small and medium-sized excavators tend to be one machine with multiple functions, equipped with a variety of working devices - in addition to the front shovel and backhoe, but also equipped with lifting, grab, flat slope bucket, loading bucket, harrow teeth, crushing cone, twist drill, electromagnetic sucker, vibrator, bulldozer, impact shovel, container fork, aerial working frame, hinged disc and dragline, etc., to meet the needs of various construction.
2) Rapid development of hydraulic excavators.
With the continuous improvement and innovation of the control mode, the excavator has developed from simple lever control to hydraulic control, pneumatic control, hydraulic servo control and electrical control, radio remote control and integrated computer program control. In the dangerous area or underwater operation, the radio control is adopted, and the electronic computer control receiver and laser guidance are combined to realize the complete automation of excavator operation.
All of these, the full hydraulic excavator for its foundation and create a good premise.
3) Pay attention to the adoption of new technology, new process and new structure, and accelerate the development speed of standardization, serialization and generalization.
① The excavator produced by Atlas company in Germany is equipped with a new type of engine speed regulating device, which makes the excavator work at the speed most suitable for its operation requirements;
② The new C series ls-5800 hydraulic excavator of Lincoln bell company is equipped with automatic control hydraulic system, which can automatically adjust the flow rate and avoid the waste of driving power. Caps (Computer Aided Power System) is also installed to improve the working power of excavator and give full play to the function of hydraulic system;
③ FJ series five new excavators produced by Sumitomo Corporation of Japan are equipped with computer-aided power control system connected with hydraulic circuit. The precise control mode selection system is used to reduce the consumption of fuel, engine power and hydraulic power, and prolong the service life of parts;
④ The oil pump regulating system of excavator produced by O & K Company in Germany has the characteristics of confluence, which makes the oil pump have the maximum working efficiency;
⑤ The 907.9 type hydraulic excavator operator of the company has no experience in the complex operation of the 907.9 type hydraulic excavator;
⑥ German Liebherr company has developed the eco (electronic control operation) control device, which can adjust the operation performance of the excavator according to the operation requirements, and has achieved the effect of high efficiency and low fuel consumption;
⑦ The new type of excavator, such as 3114b diesel engine and load sensing system, has been adopted to improve the efficiency of excavator;
⑧ Doosan construction machinery company of Korea has adopted EPOS electronic power optimization system on dh280 excavator. According to the change of engine load, the power absorbed by the hydraulic pump is automatically adjusted to keep the engine speed near the rated speed, that is, the engine always runs at full power rate. In this way, the power of the engine is fully utilized and the working efficiency of the excavator is improved, It also prevents the engine from stalling due to overload.
Luzhou Libang Metal Structure Co., Ltd. is specialized in the production and processing of excavators' positive dippers Backhoe of excavator 、 Plum blossom grab of steel grabbing machine And various metal structure products processing.
Luzhou Libang Metal Structure Co., Ltd
Mobile phone: 13550890427 Manager
Address: Section 2, Xinyang Road, high tech Zone, Luzhou City, Sichuan Province