Fire extinguisher manufacturing process
Fire extingusiher manufacturing is a utmost important field in the industry as we always need them when there is a trouble. There are some various types of fire extinguishers on the market but most of them are manufactured in the following process. First a mechanical press cuts out disks from a metal sheet, decoiled from a decoiler. The thickness of the sheet can start from 1 mm upto 3 mm for some extreme cases. The disks are put into the mould of the hydraulic deep drawing press that draws the disk into a fire extingusiher. The part that comes about looks like a pot. For a fire extinguisher there usually needs 2 action hydraulic press where the first press will draw a pot from a disk and the second press will draw the final fire extinguisher from the pot. As those pots are transferred from one pres to another, we advise either an automation between the presses or the both presses shall stay near to each other for an operator to move the pots from the first hydraulic press to the second. The disk cutting process with an eccentric mechanical press takes nealy 1 second per a disk but the way that a hydraulic press works is a little bit different and it takes much more than the time the eccentric press takes. Usuall the first drawing with an hydraulic press takes upot 15 seconds for the first drawing and the second and the third drawing together, as carried out sequentially within another hydraulic press may take upto 20 seconds. After the second and the third drawing is complete, the part is moved from the hydraulic press to the edge cutting and trimming machine
The edge cutting machine is an automated machine, that is formed by a welded and painted steel frame and some equipment on it. The equipment on the machine is a pneumatic fixer that fixes the part on the mold while the rotating blade touches the parts edges and starts to cut it while the fire extinguisher is rotating around its axis. This is an automatic process where the operator only puts the part onto the mould and presses the button. This process takes nearly 20 seconds as a cycle. The edge cutting and trimming machine is essential for an easy welding
After the edge cutting and trimming, the next step is circular welding. This process is also carried out by a circular welding machine that does vertical or horizontal welding. according to the manufacturing process of the fire extinguishers, the welding may occur once, twice or along the body the fire extinguisher. Here most customers use MIG welding which is more appropriate for the fire extinguisher manufacturing.
After the welding, the part is ready to get powder painted and assemblied with the components. Throughout the world there are common rules about firefighting equipment. All these equipment are determined as to be red in color so that's why the fire extinguishers are powder coated and cured with red colour in a full automatic line. While the fire extinguishers are going through the powder coating booth, they start rotating to make it easier for the powder coating guns to paint every side of the extinguishers. After the painting booth, the parts are cured in the oven and collected from the line for the assembly. Pressure valve and hose get assemblied on the fire extinguisher and the next step is filling with powder and testing for pressure.