1 Overview
The oil of the front and rear pumps flow into the main control valve through the central oil passage, bypass oil passage, and the combined oil passage, then the oil flows into each brake. The oil passage in the main control valve is equipped with a one-way valve and a oil hole to control the oil flow of the main pump to match each brake, and the composite operation is free.
The main control valve is equipped with a straight walking spool. If you do any brake while walking, the straight walking spool is pushed to the left by the pilot oil pressure. Therefore, the left and right travel oil supply channels are connected, and the equal amount of oil flows into the left and right travels to keep the straight line.
2, swivel and large arm composite operation
When the modern excavator is rotated and the arm, the rotary spool and the large arm fitting of the main control valve are simultaneously transferred to the functional position from the pilot oil from the remote control valve.
The oil of the front pump flows into the rotary motor by the rotary valve core, flows into the large arm cylinder through the large arm 2 valve core. The oil of the rear pump flows into the large arm cylinder through the arm 1 valve core in the right control valve. Thus, the upper turntable is rotated and the large arm is operated.
3, rotation and the composite operation of the arm
When the rotation and the wood arm are operated, the rotary spool and the appendage of the main control valve are simultaneously transferred simultaneously from the pilot oil from the remote valve to the functional position.
The oil of the front pump flows into the rotary motor by the rotary valve core, flows into the carrier cylinder through the arm 1 valve core.
The oil of the rear pump flows into the faddle cylinder through the arm 2 valve core in the right control valve, and the upper turntable is rotated and the aircraft is operated.
4, composite operation of swinging and bucket
When the rotation and bucket is operated, the rotary spool and the bucket valve core in the main control valve are simultaneously transferred to the functional position from the pilot oil from the remote control valve.
The oil of the front pump flows into the rotary motor through the rotary valve core in the left control valve. The oil of the rear pump flows into the bucket oil through the bucket valve core in the right control valve. Thus, the upper turntable is rotated and the bucket is operated.
5, rotation, bram, arm, and bucket composite operation
When the rotation, the arm, the arm, and the bucket, each of the main control valves is simultaneously moved to the composite function position at the same time from the telepheric oil from the remote control valve.
The oil of the front pump passes through the rotary spool in the left control valve, the arm 2 spool, the arm 1 spool, the parallel channel, and the conjunction channel flow into the rotary motor, the large arm cylinder, and the arm of the pump after the pump of the arm cylinder. The large arm 1 spool, the arm 2 spaghetti, the bucket, the bucket, and the combined channel flow into the large arm cylinder, the carriage cylinder and the bucket tank, and the upper turntable is rotated and the arms, the arms And buckets are operated.
6, multiple operation of swinging and walking
When the rotation and walking, the rotary spool in the main control valve and the traveling spool simultaneously moves the pilot oil from the remote control valve to the functional position, the linear walking spool is pushed to the left front of the pilot pump. The pump oil flows into the rotary motor through the rotary valve core. The rear pump oil is taken through the right-line row of the right row and the left row of the left row of the left-controlled valve.
Thus, the upper turntable is rotated and the machine is straight.
7, large arm and walking composite operation
When the large arm and walking, the large arm valve and the traveling spool in the main control valve are simultaneously moved from the pilot oil pressure from the remote valve to the function, and the linear walking spool is pushed out from the oil pressure of the pilot pump. left.
If the large arm is lifted, the oil of the front pump is parallel to the channel and the convergence channel, and then flow into the large arm cylinder through the large arm 2 and the arm 1 valve core. The oil of the rear pump passes through the straight line of the spool, and then takes the motor through the right-line row of the right-line row of the right control valve and the left row of the left row of the left control valve. Thus, the big arm is operated and the machine is straight.
8. Composite operation of the arm and walking
When the operator is operated, the leading spool and the traveling spool in the main control valve are simultaneously moved from the pilot oil pressure from the remote valve to the function, the linear walking spool is pushed out from the oil pressure of the pilot pump. left.
The oil of the front pump is connected in parallel to the convergence channel, and then flow into the large arm cylinder through the arm 1 and the arm 2 valve core. The oil of the rear pump passes through the straight line, and then the motor is taken through the left row of the right line of the right control valve and the left row of the left row of the left-controlled valve. This is operated and the machine is traveling straight.
9, bucket and composite operation
When the bucket and walking are operated, the bucket valve and the walking spacing of the main control valve are simultaneously movable from the pilot oil pressure from the remote control valve to the function, and the linear walking valve core is pushed out from the oil pressure of the pilot pump. left.
The oil of the front pump is converted through the tunnel, and then flows into the bucket oil through the bucket. The oil of the rear pump passes through the straight line of the spool, and then takes the right line through the right line of the right control valve and the left row of the left row of the left control valve. This, the bucket is operated and the machine travels straight.
