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Working principle of hydraulic transmission system of metal band saw

The hydraulic transmission system of the metal band saw consists of a hydraulic circuit composed of pumps, valves, cylinders, tanks, pipelines and other auxiliary parts. The lifting of the saw beam and the clamping of the workpiece are completed under electrical control. Through the speed control valve, the stepless speed regulation of the feed speed can be implemented to meet the needs of sawing workpieces of different materials. The electrical control system consists of a control loop composed of an electrical box, a control box, a junction box, a travel switch, an electromagnet, etc., used to control the rotation of the saw blade, the lifting of the saw beam, the clamping of the workpiece, etc., to make it follow a certain working procedure Realize the normal cutting cycle.
The lubrication system must be lubricated according to the lubrication parts of the machine tool (wire brush shaft, worm gear box, active bearing seat, worm bearing, upper and lower shaft of the lifting cylinder, and clamping screw on the sliding surface of the movable vise) before starting the lubrication system. The worm gear and worm in the worm gear box are lubricated by a No. 30 oil bath, which is injected from the oil plug hole on the upper part of the worm gear box. The box surface is equipped with an oil mark. When the saw beam is at the lowest position, the oil level should be at the upper and lower limits of the oil mark. between. The oil should be changed after a month of trial use, and then every 3-6 months. The lower part of the worm gear box is equipped with an oil drain plug.

Saw blade transmission The motor mounted on the worm gear box drives the worm and worm wheel in the worm gear box through the belt pulley and triangle tape, drives the driving wheel to rotate, and then drives the saw blade around the active/passive rim to perform cutting and rotary motion. The saw blade feed movement is a hydraulic circulation system composed of a lifting cylinder and a speed regulating valve, which controls the lowering speed of the saw beam to control the feed (stepless speed regulation) movement of the saw blade. The saw brush rotates at the place where the saw blade generates debris, and rotates with the saw blade in the direction of the saw, and is cleaned by the cooling liquid by the cooling pump to remove the chips on the saw teeth. The coolant is in the cooling fluid tank on the right side of the base and is directly driven by the water pump to supply the coolant.

Press the emergency stop (stop) button and rotate clockwise, the oil pump motor works, the gear pump works, the oil enters the pipeline through the filter screen, and the overflow valve is adjusted to make the system working pressure meet the requirements. Otherwise, press the button inward and all motors will stop working. The workpiece is clamped by pressing the clamp button, the solenoid valve works, the hydraulic oil enters the left side of the clamping cylinder, the right hydraulic oil returns to the oil tank, and the left clamp is clamped to the workpiece.
When the saw beam is lowered, press the working clamp, the hydraulic oil enters the rod cavity of the lifting cylinder through the solenoid valve; the rodless cavity hydraulic oil passes through the solenoid valve, and the one-way speed control valve returns to the oil tank. When the saw beam is quickly lowered, press the down button, the hydraulic pressure works through the solenoid valve, the oil enters the rod cavity of the lifting cylinder, and the rodless cavity oil returns to the oil tank through the solenoid valve. When the saw beam rises, press the up button, the hydraulic oil enters the rodless cavity of the lifting cylinder through the solenoid valve; the rod cavity oil returns to the oil tank through the solenoid valve. When the workpiece is released, press the clamp release button, and the hydraulic oil enters the right side of the clamping cylinder through the solenoid valve; the left hydraulic oil can pass through the solenoid valve and return to the oil tank, and the left jaw moves to the left to release the workpiece.

The analog input and output module of the system makes the monitoring of the sawing process have a wide range of meanings. For example, as long as the sawing machine increases the feedback of the saw blade deformation, the sawing speed can be adaptively adjusted. By adding a servo valve, the speed and position control of the sawing process can be optimized. The management function of the system makes the management of materials and workpieces more convenient. The system’s Chinese interface and real-time graphic status display make the operation more friendly and intuitive.

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