Structure, use and maintenance of cardless rotary cutting machine
The cardless rotary cutting machine is an efficient equipment in plywood production. Its core advantage lies in the fact that it does not require traditional cardholders to clamp wood segments, but instead achieves continuous rotary cutting through friction roller drive, significantly improving wood utilization.
structural analysis
Rack and Drive System
Adopting high-strength cast iron or welded steel structure frame, carrying double roll system, single roll system and tool holder. The drive system consists of a motor, a reducer, and a V-belt, which distributes power to double friction rollers (diameter 300-500mm) through sprocket or gear transmission to drive the rotation of the wooden section.
Dual roll and single roll collaborative system
The dual roller system consists of an active roller and a passive roller. The surface of the active roller is covered with rubber or a toothed coating to enhance friction, while the passive roller adjusts pressure through hydraulic or spring means to ensure stable rotation of the wood segment. As an auxiliary drive, the single roll system can supplement power during the final stage of rotary cutting, reducing residual wood cores.
Knife holder and feed mechanism
The knife holder adopts a dovetail slide design, which is fed through a screw or cam. The rotary knife is installed at the front end of the knife holder, with the blade edge forming an angle of 0.5 ° -1.5 ° with the axis of the wooden section. The blade needs to maintain an arc-shaped curvature of 0.1-0.2mm to reduce vibration. The feed rate is controlled by PLC and adjusted in real-time according to the diameter of the wood segment.
operation point
Clamping and debugging
Place the wooden section between the double rollers, activate the hydraulic system to reduce the roller spacing to 5-10mm, and control the pressure through a pressure sensor (recommended 15-25MPa). Manually adjust the knife holder to the initial position, and set the gap between the knife door to the thickness of the single board+0.1mm.
Rotary cutting parameter control
Adjust the double roller speed (60-120r/min) and feed rate (0.1-0.5mm/r) according to the hardness of the wood. Pine and other soft woods use high-speed low feed, while hardwood uses the opposite. At the end of rotary cutting, the feed rate needs to be reduced to minimize the cracking of the wood core.
Maintain standards
Daily maintenance
Clean the sawdust from the knife holder, roller, and guide rail daily, and blow the oil circuit with compressed air. Check the hydraulic oil level (oil window centerline ± 5mm). If the oil temperature exceeds 60 ℃, stop the machine for cooling.
Regular maintenance
Check the roller runout (≤ 0.05mm) weekly, replace the hydraulic oil filter element monthly, clean the oil tank quarterly and replace the hydraulic oil (HM46 anti-wear hydraulic oil). The blade wear exceeds 0.3mm and needs to be re sharpened. After sharpening, the curvature of the arc needs to be adjusted.
Fault handling
When the thickness of the single board is uneven, check the installation height of the blade (the distance between the blade tip and the center line of the card shaft is 101-103mm) and the gap between the blade and the door. If the residual wood core is too large, the double roller pressure needs to be adjusted or the worn rubber coating needs to be replaced.
