TOPRA GD 1224/1228 Dwell Unit Dwell Unit Operation Introduction1 OverviewThis part is mainly to introduce the dwell unit functions and integrants. Dwell unit introduction：The bottom vacuum suction makes the paperboard transfer more precise and stable; The paperboard is dried enough before it comes into the next unit. Dust from slotter or die-cutter unit can be prevented from coming into printer unit. Also it offers space for adding other drying devices. The dwell unit is mainly composed of the followings: side frames, steel support, vacuum chamber assemblies, lifter assembly, hot air system, pneumatic assemblies, oil tank and oil returning circuit, lubricating system, driving gear, motor, electric cabinet and electrical control components. The dwell unit itself is a complete and independent unit. Main functions for vacuum chamber assemblies and fan assembly: motors are installed on the support of electric cabinet by the brackets. The motors connected with fans. As they run, the fans will run as well and then generate the suction power. The air was sucked downwards through the gap formed between long square hole of the guide plate and feeding wheels. The printed paperboards are sucked tightly to the wheels for enough air speed and air flow，at the same time the paperboards are transferred downstream by the feeding wheels. Lifter main function: the running motor activates the lifter moving up and down, through that it can control the rise and down of vacuum chamber, so it controls the feeding height finally. Hot air system main function：The printed paperboards are dried timely through the fan installed on the bracket. So the patterns on the printed paperboards will not be destroyed while passing the following units. Infrared drying system main function: the printed paperboard dried as it through the infrared system. So the patterns on the printed paperboards will not be destroyed while passing the following units. The driving gears are hardened, ground and HRC 55. The upper oil tank is made from aluminum plate and the lower oil tank is made from casting aluminum alloy .The oil-returning-device is used to connect each unit lower oil tank when the units are locked，so the lubricant in each unit can be kept in the same level. The oil gauge can be used to watch the lubricant height in the lower oil tank .2 Lubricating System IntroductionLower oil tank and oil circulating device Lubricating system main function：The filtrated lubricant is extracted out of the oil tank through oil pump，and the driving gear is lubricated through divider and small copper pipe. We can know if the lubricating system works properly through oil watching system. Oil observing window3 Mechanical parts position and description1 Electric cabinet 2 Fan assembly3 Hot air fan 4 Air chamber5 vacuum chamber 6 Infrared drying system7 Lifter assembly 8 Oil tank assembly9 Gear assembly 10 Electric control box assembly11 Digital displayPart 11 is usually fixed on the last unit. 1. air duct 2.control panel 3. oil observer4 Function IntroductionWe are going to introduce control panel function, including all buttons.4-1 Control Panel Introduction Control panel4-2 Control Panel Button Function Introduction 4-2-1 Emergency Stop Button Only used in emergency situation. Press this button, all machine action and automatic control stop. Turn the button clockwise, and the machine can be started again.4-2-2 Power supply indicator Turn on the main switch，and the indicator is on Turn off the main switch，and the indicator is off 4-2-3 Unit interlock （1） （2） This is a 2 position switch. Used to control interlock close and opening When the button is turned to “I”, the interlock is opened. Opening and close for units can be processed. (shown as pic 1) When the button is turned to “O”, the interlock is closed. Opening and close for units can not be processed. (shown as pic 2)Note: The switch is not allowed to use when the machine is in running, and the switch must be turned to theposition like picture (2) 4-2-4 Unit movement（1） （2）Unit moving control button This is composed of 3 button switches to control the units moving direction. It is specially designed to avoid being injured while working. To make units move left，push right button with right hand and left button left hand, shown as picture one.Note: It is invalid to push just one button. To make units move right，push right button with right hand and left button left hand, shown as pictur