Structure of sawing machine

The main parts of the sawing machine have a bottom seat; Bed and column; Saw beam and transmission mechanism; Guide device; Workpiece clamping; Tensioner; Feeding rack; Hydraulic transmission system; Electrical control system; Lubrication and cooling system;

base

The base is a box structure welded by steel plates, on which the bed and column are fixed,

There is a large space in the inner cavity of the base. The front left side is the electric button control box, the right side is the electric distribution board box, and the middle is the hydraulic oil tank welded by steel plates. The cavity is equipped with a hydraulic pump station, hydraulic pipelines, the right side is the cooling cutting fluid tank and water pump, and the bottom four corners are equipped with anchor bolt holes.

Bed

The lathe bed is made of cast iron and fixed on the base. The column is composed of a large and small column. The big round column is used as the guide rail for the saw carriage to support the upward and downward movement of the saw beam and ensure accurate guidance. The small column plays an auxiliary role to ensure the normal cutting of the saw blade. The middle part is a clamping vise and a manual feeding mechanism. The front of the vise is connected with a worktable for receiving finished products. The clamping device on the left side is that the clamping screw goes through the inner hole of the hydraulic clamping cylinder rod, and the left jaw moves left and right by turning the handwheel or pressing the button.

Saw beam and drive mechanism

It is cut, formed and welded from thick steel plates, and has strong rigidity. The right rear side is fixed with a worm gear box. The worm gear in the box is fixedly connected with the driving gear on the saw beam, and both rotate synchronously. The left side is the tensioning position of the driven gear and the saw blade. The rotary motion of the saw blade is driven by the main motor, belt pulley and worm gear pair through two-stage speed change to the driving wheel, and then driven by the driving wheel and the saw blade to the driven wheel. The saw blade operates at three speeds.

Saw blade guide

The guide device installed on the saw beam support plate is composed of left and right guide arms and guide heads. Both the left and right guide arms can move along the dovetail (or the right guide arm is fixed on the column sleeve). The distance between the two guide arms is adjusted to be about 40mm wider than the size of the workpiece. The guide device is used to change the installation angle of the saw blade so that the saw blade is perpendicular to the workbench. To ensure the cutting accuracy of the saw blade and reduce vibration, a group of guide wheels (rolling bearings) and wear-resistant guide blocks are installed on the left and right guide arms, and wear-resistant alloy guide blocks are also installed on the back of the saw blade.

Clamping mechanism

The right vise is fixed on the machine body, the clamping screw rod passes through the inner hole of the hydraulic clamping cylinder, and the screw rod connects the left vise, which moves left and right along the guide rail. When the left vise is 10-30MM away from the workpiece, it is connected. Press the control panel to tighten or loosen the clamp to clamp or loosen the workpiece.

Tensioner

Tensioning device is composed of sliding plate seat, sliding plate, screw rod, etc. When the saw blade is to be tensioned, use a torque wrench to rotate clockwise to tension the saw blade, which is in working condition. If the sawing machine is shut down for a long time, the torque wrench rotates the saw blade counterclockwise to loosen it. After loosening the saw blade, a new saw blade can be replaced.

working principle

The hydraulic transmission system is a hydraulic circuit composed of pump, valve, oil cylinder, oil tank, pipeline and other components and accessories. Under the electrical control, the lifting of the saw beam and the clamping of the workpiece are completed. The feed speed can be adjusted steplessly through the speed regulating valve to meet the sawing requirements for workpieces of different materials. The electrical control system is a control loop composed of an electrical box, a control box, a junction box, a travel switch, an electromagnet, etc. It is used to control the rotation of the saw blade, the lifting and lowering of the saw beam, the clamping of the workpiece, etc., so that it can achieve a normal cutting cycle according to a certain working procedure.

Before starting the lubrication system, oil must be added according to the requirements of the lubricating parts of the machine tool (wire brush shaft, worm gear box, active bearing seat, worm bearing, upper and lower shafts of lifting cylinder, and clamping screw of sliding surface of movable vise). The worm gear and worm in the worm gear box shall be lubricated by No. 30 oil bath, and injected through the oil plug hole on the upper part of the worm gear box. The oil level shall be between the upper and lower limits of the oil level when the saw beam is at the lowest position. 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.

The motor installed on the worm gear box drives the worm and worm gear in the worm gear box through the belt pulley and V-belt to drive the driving wheel to rotate, and then drives the saw blade around the active/passive rim to perform cutting rotary motion. The feeding movement of the saw blade is a hydraulic circulation system composed of a lifting cylinder and a speed regulating valve, which controls the lowering speed of the saw beam and thus controls the feeding (stepless speed regulation) movement of the saw blade. The saw brush rotates at the place where the saw blade chips and rotates in the direction of the saw blade. The coolant pump is used to clean the saw blade and remove the chips on the saw teeth. The coolant is in the cooling cutting fluid tank on the right side of the base, which is directly driven by the water pump to supply coolant.

Press the emergency stop (stop) button, rotate clockwise, the oil pump motor works, the gear pump works, the oil enters the pipeline through the filter screen, and adjust the overflow valve to make the system working pressure meet the requirements. On the contrary, press the button inward, and all motors stop working. When the workpiece is clamped, press the clamping button, the solenoid valve works, the hydraulic oil enters the left side of the clamping cylinder, the right side returns to the oil tank, and the left clamp clamps the workpiece.

When the saw beam is lowered, press the working press pliers, and the hydraulic oil enters the rod cavity of the lifting cylinder through the solenoid valve; The hydraulic oil in the rodless chamber returns to the oil tank through the solenoid valve and one-way speed regulating valve. Press the lowering button for quick lowering of the saw beam, the hydraulic pressure works through the solenoid valve, the oil enters the rod cavity of the lifting cylinder, and the oil in the rod cavity returns to the oil tank through the solenoid valve. When the saw beam rises, press the rising button, and the hydraulic oil enters the rodless chamber 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 return to the oil tank through the solenoid valve, 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 broad significance. For example, the sawing speed can be adjusted adaptively as long as the feedback of the saw blade deformation is increased. The speed and position control of sawing process can be optimized by adding servo valve. The management function of the system makes the management of materials and workpieces more convenient. The Chinese interface and real-time graphic status display of the system make the operation more friendly and intuitive. Because the system adopts standard PC, the network management of sawing is more convenient.