Classification of belt machines depending on automation.
Manual or gravity band machines: In manual band saws, the saw frame is lowered by applying the worker's force, which overcomes the spring force.
The cutting of the saw frame and its lowering in gravity manual machines is carried out under the force of its own weight. A hydraulic cylinder with a throttle valve, or as it is also called a bypass valve, controls the speed at which the saw frame is fed.
This system is also referred to as hydraulic unloading, it provides lifting and stopping of the frame at the top.
The use of a manual vise makes it possible for the machine operator to independently set, measure and fix the workpiece.
Under its own weight, the saw frame is reduced, the speed of movement down can be adjusted by remote control and done manually.
Most often, a console is used for the design of manual band saws.
Advantages of manual machines: Price and quality.
Despite the low cost of the equipment, the high quality of the cut is ensured.
The machines do not require expensive maintenance and operation.
Cutting at an angle.
The workpieces are cut at an angle, the angles can be adjusted up to 60 degrees.
Disadvantages of manual belt machines: The vibration of the blade during cutting is formed by lowering the saw frame using its own weight or the use of human force.
This reduces the durability of the saw.
In many designs, it is not possible to visually control the tension of the saw and its cleaning mechanisms.
It is necessary to adjust the tilt of the axes of the saw drive pulleys from time to time.
It is impossible to control and regulate the pressure that the saw exerts on the workpiece.
On the support cylinder, the valve makes it possible to adjust only the feed rate in a fairly narrow range.
Basically, such machines are used in small and small-scale industries that cut stainless and tool steels, light and non-ferrous metals, both solid blanks and profiles.
09 Martha 2017
