M.T.I. Qualos supplies a range of high speed roller freezer doors with an electrically-powered roller and various safety features.
The high speed roller freezer doors feature a control box incorporating OPEN/STOP/CLOSE push buttons in addition to a lockable mains isolator and an emergency stop button.
The control box can also incorporate a remote control system, pull cords, radar, induction loops and airlock-type controls.
The intermediate stop function is freely adjustable to suit specific site requirements.
The high speed roller freezer doors have a self-supporting, easy-to-install construction consisting of two side guides and a top roller.
The electrically-powered top roller moves the plastic fabric door curtain rapidly up and down.
The control box provides operator controls and monitors the door curtain movements as well as the safety functions.
Safety features in these high speed roller doors include a self-monitoring safety edge that reverses the door on impact and an anti-crash mechanism.
A safety photo electric cell mounted within the side frame prevents the door from closing if obstructed.
An emergency cranking facility is also supplied for opening the door during power failure.
The high speed roller freezer doors are made from galvanised, bolt-on steel sheet side frames with integral guides for the door curtain and integral sealing brushes.
The top roller is made of precision drawn steel tube.
The door curtain is made from 1.5mm thick plastic reinforced fabric, constructed in three sections and separated by aluminium wind bars.
The central section consists of a transparent PVC vision panel stretching from 1400mm to 2400mm above the floor.
An aluminium bottom rail with self-monitoring safety edge and rubber seal is also provided.
The high speed roller freezer doors are driven by a SEUSTER compact electric motor/gearbox combination ready for keying to the top roller.
The drive is fitted with a magneto-electric brake and six limit switches mounted directly on the shaft.
Mounted right by default, the drive can optionally be mounted left.
The high speed roller freezer doors have an opening speed of 1.4 m/sec and closing speed of 0.5 m/sec.
The controller is equipped with an inverter to ensure fast, smooth operation on acceleration and braking.
Any normal pulse generator, time-delay relays or diagnostic LEDs may be connected to the controller.