[China Road Machinery Network Original] As the latest masterpiece in 2015, Shangong's SEM921 grader is designed to create higher value for users. The load hydraulic system is used to provide uniform and accurate blade motion. Work flatness. The control valve PPPC (proportional priority, pressure compensation control valve) specially designed for the Caterpillar grader, the power distribution according to demand and the proportional distribution of flow, enable the driver to operate multiple compound actions at the same time, significantly improving work efficiency. In terms of the control system, the seven-hole linkage mechanism uses electro-hydraulic control and can be operated by a switch in the cab. The SEM921 grader comes standard with a blade float function to avoid road damage and improve work efficiency, making the new mountain grader especially suitable for snow removal operations.
Spacious and comfortable cab
·The cab is located on the front frame, which clearly shows the position of the traction frame, turntable and blade, which helps the driver to control the positioning of the blade more precisely.
· Large and spacious (1.9 meters high), can be operated, the volume is 30% larger;
·The front wheel steering can be clearly seen when the waist is twisted to ensure the safety and accuracy of the operation.
Load sensing hydraulic system
· Specially designed control valve PPPC (proportional priority, pressure compensation control valve) for Caterpillar grader. Power is distributed according to demand and flow is proportionally distributed. The driver can operate multiple compound actions at the same time, significantly improving work efficiency;
· Variable displacement piston pump to reduce power consumption and overheating of hydraulic system and reduce fuel consumption;
· Load-sensing hydraulic system, providing uniform and accurate blade movement to improve the smoothness of the work;
· The PPPC valve is equipped with a one-way locking valve to prevent leakage inside the valve core when there is no hydraulic action, to prevent the cylinder from sinking and to avoid accidental injury.
Seven-hole connecting rod control system
·The seven-hole linkage mechanism adopts electro-hydraulic control and can be operated by the switch in the cab;
· Maximize the extended blade, the blade can be up to 90 degrees vertically at the end, which is convenient for high back slope operation;
· The blade can reach the bottom of the groove to cut and clean the overly lush vegetation;
· The connecting rod can be extended upwards to repair the river bank back slope and the groove back slope;
· The connecting rod comes standard with a replaceable bushing to reduce service time and maintenance costs.
Blade floating technology
· Standard blade floating function to avoid road damage and improve work efficiency;
· When the user pushes the left and right lifting cylinder operating handles down to the bottom, the cylinder will automatically sink to the ground, and the blade floating function can be used at this time;
· Especially suitable for snow removal operations.
Type A traction frame
· The A-type traction frame consists of two square steels with high strength and durability, and low failure rate;
·The ball head can adjust the gap according to the wear condition (adjust the gasket), reducing the maintenance cost of the user;
·The detachable connecting ball head is fixed by bolts for easy maintenance.
Box structure front frame
· Flanged box structure design, the welding is transferred from the area under higher pressure, which improves the reliability and durability and prolongs the service life of the structural parts;
· Continuous top and bottom plate construction provides excellent consistency and strength, fully conforming to Cat structural design requirements, extending the life of the front frame and reducing maintenance costs;
·The front side of the front frame is arranged for easy maintenance;
• Use self-lubricating bushings for critical parts to increase reliability and reduce maintenance costs.
Reasonable manipulation layout
·The distance between the operating levers is appropriate, and the driver can operate several joysticks with one hand;
· Light maneuvering force to reduce driver fatigue;
· Shorter stroke, 40 mm.
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