Jingong JGM757-II wheel loader
Structural design innovation
The working device adopts the internationally popular long rocker arm, short pull rod, new structure of flat straight arm, and horizontal-placed boom hydraulic cylinder. The single rocker arm Z-shaped reversing mechanism has been optimized and designed, and has been strengthened by the structure and the force of digging is greater. Improve the structural strength and reliability. The working device pin adopts a dust-proof structure, which improves the working conditions of the pin and improves the service life of the sleeve.
JGM757-II adopts articulated frame, rear frame of double-sided single-board structure, front frame adopts four-plate structure, simple structure and good craftsmanship; front and rear frames are connected by tapered roller bearings, bearing capacity, lubrication environment it is good. The front and rear hinges of the frame are centered, and the wheelbase is lengthened to increase the rollover load, and the front and rear wheel tracks are overlapped during steering, which improves the passability and prolongs the service life of the tire.
Powertrain Matching Design
Adopting Weichai WD10G220 energy-saving and environmental protection type Lanqing Power II generation low-speed diesel engine, the emission meets the Phase II standard of China's non-road mobile machinery diesel engine, featuring high torque, low fuel consumption, and high reliability.
Hydraulic system design innovation
The JGM757-II loader uses a dual-pumped hydraulic system consisting of a new full-hydraulic coaxial flow amplifying diverter, a priority valve and a new unloading valve. Through the split valve function of the priority valve, when the two systems work together, priority can be given to the requirement of steering. When the steering is not working, all the oil quantity enters the hydraulic system of the working device to ensure the working efficiency of the working device and achieve the energy saving effect. The hydraulic system adopts a low pressure unloading system for the working pump. When the working hydraulic system pressure is lower than 12 MPa, all the hydraulic oil output by the working pump passes through the unloading valve and the steering pump through the priority valve to merge the oil and enter the working distribution valve. It meets the requirement of rapid raising of the boom when the loader is working to remove loose soil.
When the working hydraulic system pressure is higher than 12MPa, all the hydraulic oil output by the working pump directly returns to the tank through the unloading valve. At this time, the unloading pressure loss of the working pump is less than 0.7MPa, and the small amount of high-pressure oil required by the working hydraulic system at this time is The steering pump is provided to reduce the overflow of the working pump under the high pressure state so as to reduce the heating and energy saving of the hydraulic system. At the same time, the power of the diesel engine is more transmitted to the transmission system, and the traction during the shoveling work of the loader is improved. To meet the requirements of the loader to increase traction when shoveling hard soils or stones.
The hydraulic system of the working device adopts pilot operation, and the handle operating force is 10N, which reduces the driver's labor intensity and improves work efficiency.
Braking system design innovation
Optimize the parking brake system to achieve low pressure start protection, low pressure and automatic braking when the air is broken, to improve the safety of driving. The service brake adopts the domestically-developed air cap clamp disc brake system, which is safe and reliable.
Electrical system and cab design innovation
The use of electronic monitoring systems improves fault diagnosis and maintenance efficiency. The key sensors are manufactured using domestic aerospace technology to ensure the high reliability of electrical systems. The working device electronics are automatically leveled, reducing the driver's operating intensity and improving the overall operating efficiency. Increase the return filter plugging the alarm sensor so that the cleanliness of the hydraulic system can be effectively monitored.
The cab uses ergonomic principles to optimize driving manoeuvring parameters, improves driver comfort, reduces fatigue, and improves work efficiency. New elastic suspension and sealing techniques are used to reduce vibration and noise and improve cab comfort. (This article comes from Jingong)
