초록 ▼

An air filter for electric welding includes a box having an opening for connecting with a sucking tube, an dividing plate dividing the box into an upper chamber communicating with the opening and a lower chamber, a spark blocker inside the upper chamber, a movable filter device set under the spark b

An air filter for electric welding includes a box having an opening for connecting with a sucking tube, an dividing plate dividing the box into an upper chamber communicating with the opening and a lower chamber, a spark blocker inside the upper chamber, a movable filter device set under the spark blocker inside the upper chamber and provided with a cloth filter, a blower inside the lower chamber, and an extractable screening device installed outside it and communicating with the lower chamber. In using, when the blower is switched on, the air is sucked in from the sucking tube to the spark blocker, the movable filter device, the blower and the extractable screening device orderly, blocking sparks completely and achieving an effective filtration.

대표청구항 ▼

What is claimed is: 1. An air filter for electric welding comprising: a box provided with a dividing plate to divide said box into an upper chamber and a lower chamber, an opening at its top wall for connecting with a sucking tube, a sidewall provided with a plugging groove at the top, and a rear w

What is claimed is: 1. An air filter for electric welding comprising: a box provided with a dividing plate to divide said box into an upper chamber and a lower chamber, an opening at its top wall for connecting with a sucking tube, a sidewall provided with a plugging groove at the top, and a rear wall of said lower chamber provided with an opening; said dividing plate provided with a penetrating hole at the center to communicate with said upper chamber and said lower chamber; a spark blocker fitted in said plugging groove of said box to seal the top side of said upper chamber; a movable filter device being installed inside said upper chamber and comprising of a first rolling base, a second rolling base corresponding with said first rolling base, a rolling table and a rolled cloth filter winder; said rolling table comprising of: a frame fixed under said spark blocker inside said upper chamber; a first axle fixed at one side of said frame and provided with a driving gear respectively at two ends and a driven gear set outside one end of said driving gear; a second axle fixed at the other side of said frame and provided with a driving gear respectively at two ends, a driving motor fixed on said frame and provided with a power-output shaft installed with a driving gear; a first chain mounted between said driving gear of said driving motor and said driven gear of said first axle and able to transfer power to said first axle; two second chains respectively mounted between said driving gear of said first axle and that of said second axle at the same side and driven by said driving gears of said first axle to rotate; and plural supporting rods connected between said second chains and spaced apart with a preset distance and driven by said second chains to move in a circulating condition, forming a rolling rods unit; said first rolling base and said second rolling base respectively installed on two sides of an upper surface of said dividing plate, said rolling table fixed under said spark blocker inside said upper chamber and having a circulating rods unit, said rolled cloth filter winder provided with a first shaft connected pivotally with said first rolling base, a second shaft connected pivotally with said second rolling base, a rolled cloth filter mounted around said first shaft and provided with a free end able to be pulled outwards to pass over said rolling table to get wound around said second shaft, said cloth filter also laid and moved on said rolling table; a blower installed inside said lower chamber of said box and provided with a sucking opening connected with said penetrating hole of said dividing plate, and at least an air exit; and an extractable screening device installed outside said opening of said rear wall of said box and provided with a frame having an interior space, an entry and an exit, a filtrating screen set above said frame and having at least a screen located between said entry and said exit for screening air sucked in, said entry communicating with said exit and said opening of said lower chamber. 2. An air filter for electric welding as claimed in claim 1, wherein said penetrating hole of said dividing plate is connected with a tube, which has two ends extending respectively into said upper chamber and said lower chamber and connected with said sucking opening of said blower by the bottom end. 3. An air filter for electric welding as claimed in claim 1, wherein said upper chamber of said box is provided with an opening at two sidewalls respectively, covered pivotally by a movable side cover. 4. An air filter for electric welding as claimed in claim 1, wherein said upper chamber of said box and said lower chamber are respectively provided with an opening at the front side, covered pivotally by a movable front cover. 5. An air filter for electric welding as claimed in claim 1, wherein said spark blocker is provided with a lower receiving plate and an upper receiving plate located above said lower receiving plate, said lower receiving plate and said upper receiving plate spaced apart properly and provided respectively with plural air vents of a preset size. 6. An air filter for electric welding as claimed in claim 5, wherein said air vents bored in a portion of said upper receiving plate facing exactly to said opening of said top wall of said box are spaced apart thinly. 7. An air filter for electric welding as claimed in claim 1, wherein said first rolling base is provided with: two bases fixed respectively at a front and a rear portion of a left upper surface of said dividing plate and provided respectively with a bearing base at the top, and two bearing installed in said bearing base; an immovable pivot connected pivotally with said bearings of one of said bases and provided with an immovable stopper at an inner end for pushing tightly against one end hole of said first shaft; and, a movable pivot connected pivotally with said bearings of the other of said bases and provided with a stopper movable inwards for pushing elastically against the other end hole of said first shaft. 8. An air filter for electric welding as claimed in claim 1, wherein said second rolling base is provided with: two bases fixed respectively at a front and a rear portion of a right upper surface of said dividing plate and provided respectively with a bearing base at the top, and two bearings installed in said bearing base; an immovable pivot connected pivotally with said bearings of one of said bases and provided with a stopper immovable for pushing tightly against one end hole of said second shaft; a movable pivot connected pivotally with said bearings of the other of said bases and provided with a stopper movable inwards for pushing elastically against the other end hole of said second shaft; and, a driving motor able to drive said movable pivot to rotate so as to let said cloth filter wound around said second shaft in a preset tension. 9. An air filter for electric welding as claimed in claim 1, wherein said rolling table is also provided with a tension gear that is connected pivotally to said frame, engaged with a portion of said first chain to control the tension of said first chain. 10. An air filter for electric welding as claimed in claim 1, wherein said rolling table is further provided with a timer for controlling a period of time for said driving motor to operate. 11. An air filter for electric welding as claimed in claim 1, wherein said blower is provided with a sucking opening facing to the rear wall of said box. 12. An air filter for electric welding as claimed in claim 1, wherein said blower is provided with two air exits facing to two sidewalls respectively. 13. An air filter for electric welding as claimed in claim 1, wherein said extractable screening device is provided with three filtrating screens. 14. An air filter for electric welding as claimed in claim 13, wherein said three filtrating screens are a primary screen, a high-efficiency screen and an active carbon screen. 15. An air filter for electric welding as claimed in claim 1, wherein said sucking tube can be bent randomly to any direction.