Information source, 8035 Wood Industry Network
Wood planing machine is the main equipment for producing veneer and thin wood. According to the direction of movement of the planer relative to the horizontal plane, wood planing machines can be divided into two categories: vertical and horizontal; according to whether the cutting direction is perpendicular or parallel to the length of the wood fiber, wood planing machines can be divided into two categories: vertical and horizontal. Transverse planing machines and longitudinal planing machines. The external dimensions of modern planing machines are only 1/3 of those of previous planing machines. They are compact in structure, light in weight, and easy to install and debug. They can be produced continuously, saving time for loading and clamping wood, and have high production efficiency. They work extremely smoothly and are almost audible. No noise.
The rotary cutting machine is also one of the main equipment for producing veneer. In a sense, it is more widely used than the planing machine. Rotary cutting machines can be divided into concentric rotary cutting and eccentric rotary cutting according to whether the wood section rotates around its own axis. Concentric rotary cutting machines are divided into two types: rotary cutting machines with stuck shaft and rotary cutting machines without stuck shaft. Eccentric rotary cutting can obtain beautiful radial patterns, but the productivity is lower than concentric rotary cutting.
Rotary cutting machines are generally large in size and have complex structures. The logs need to be centered before loading onto the machine. If the centering is not accurate, intermittent veneer strips or narrow veneers will be spun out when the rotary cutting begins. The more broken veneers or narrow veneers there are, the more veneers with good sap material will be lost, which is not conducive to the continuity of production. The logs are curved, have irregular cross-sections, and have big and small heads (sharpness) at both ends, etc., which can easily cause the veneers to spin out into shredded veneers, which is a waste of wood. And when the diameter of the log is reduced to a certain extent, it can no longer continue to be peeled (that is, the remaining wood core causes wood waste).
The disadvantage of the slicing machine is that the width of the veneer is narrow, generally 300rnm when there are special requirements.
1. Low speed and large torque. Compared with electromagnetic motors, the most significant feature of ultrasonic motors is their high torque output at low speeds. The torque density (torque to weight ratio) of the ultrasonic motor is more than 100 to 1000 times that of the electromagnetic motor.
2. The structure is simple and flexible, and the movement forms are diverse. Ultrasonic motors are generally composed of a stator and a rotor (or moving body), and the stator and rotor of the motor can be easily integrated with the fixed parts and moving parts of the motion system respectively. Ultrasonic motors have a variety of flexible structural forms such as rings, circular plates, square plates, cylinders and spheres, and are very easy to realize various forms of motion, such as rotational motion, linear motion, two-dimensional plane motion and three-dimensional motion.
3. Life, noise and reliability issues. Since most of the driving of ultrasonic motors is contact type, this will inevitably bring about the problem of friction loss between the stator and the rotor.
At present, the continuous working life of the developed low-power ultrasonic motors is generally about a few thousand hours. Ultrasonic motors have short lifespan, poor reliability, and unstable operation, which are urgent problems that restrict their practicality and industrialization. However, at present, in some situations with special working properties or special requirements for the motor, ultrasonic motors can still give full play to their advantages of large torque density, flexible structure, no electromagnetic interference, and large static holding torque. Ultrasonic motors are widely used in aerospace, finishing equipment, automotive industry, scientific instruments or medical equipment with strong magnetic fields or requirements for magnetic fields, precision instrumentation, office automation equipment, micromachines, military industry and semiconductor processing industry and other related fields. . Left and right or narrower, all need to be spliced, the wood utilization rate is low, and the productivity of planing is only about 10% of that of rotary cutting; the planing machines currently used only cut thin wood.