Automatic gas cylinder filling system and operating instructions

A method of operating an automatic gas cylinder filling device, the method comprises following steps:

• step 1:
• sequentially loading a plurality of gas cylinders into a gas cylinder fixing mechanism, and fixing the gas cylinders by using the gas cylinder fixing mechanism;
• step 2:
• lifting the gas cylinder together with a turntable in an 8-bottle gas cylinder rotating and weighing mechanism, and rotating the gas cylinder with the turntable in a curved manner, pre-aligning a gas cylinder valve so that directions of gas inlets of the gas cylinder valve are the same, after rotating to reach a concentric position of a lifting frame, corresponding the direction of gas inlet of the gas cylinder valve with a gas cylinder filling fixture;
• step 3:
• driving a lifting frame to descend by a lifting stepper motor, detecting an opposite signal by a center detecting sensor, simultaneously stopping a center of the gas cylinder filling fixture and a center of the gas cylinder valve, controlling the gas cylinder filling fixture to fix the gas cylinder valve by a PLC control unit;
• step 4:
• driving the lifting frame to continue to descend by the lifting stepper motor, when a height detecting sensor detects a highest position of the bottle valve, accurately engaging claws of a hand wheel clamping mechanism with a hand wheel, controlling a slide cylinder to drive the claws to clamp the hand wheel by the PLC control unit, and at this time, the gas cylinder filling fixture is in a suspended state;
• step 5:
• automatically descending a lifting cylinder of the 8-bottle gas cylinder rotating and weighing mechanism by control of the PLC control unit, stably falling the gas cylinder fixing mechanism on an electronic scale, and taring the gas cylinder by control of the PLC control unit before weighing;
• step 6:
• controlling a bottle valve hand wheel switch mechanism to rotate the hand wheel according to an opening direction of the bottle valve by the PLC control unit, that is, opening the bottle valve, and controlling a vacuum pump to start vacuuming the gas cylinder by the PLC control unit;
• step 7:
• turning off the vacuum pump by the PLC control unit when a vacuum degree reaches a set value, sequentially and respectively controlling a plurality of gas source cylinders to be filled into the gas cylinders according to a built-in calculation software in a gas filling system, wherein each filling needs to be weighed, after reaching a predetermined weight, controlling a valve on a gas pipeline to be closed by the PLC control unit, when each gas is filled into the gas cylinder with a pre-calculated amount, controlling the bottle valve hand wheel switch mechanism to rotate the hand wheel in a closing direction of the bottle valve, that is, closing the bottle valve;
• step 8:
• lifting the lifting frame by the lifting stepper motor until the gas cylinder filling fixture contacts a bottom end of the lifting frame, controlling the PLC control unit to loose the gas cylinder filling fixture, wherein at this time, the gas cylinder filling fixture and the gas cylinder valve are completely detached from each other;
• and
• step 9:
• continuously lifting lift the lifting frame by the lifting stepper motor until the lifting frame is lifted to an initial position, and completing a gas cylinder filling process, and sequentially repeating same process to complete the filling process.