(1) Reciprocating vacuum pump , rotary vane vacuum pump , slide valve vacuum pump, Roots vacuum pump is the piston reciprocating or rotating the gas inhalation, compression and discharge. Their advantage is that the new pump has a relatively high degree of vacuum, but the piston is a running part, so piston wear can not be avoided, as the number of maintenance increases the working vacuum will continue to decline until it can not meet the production requirements. Such pumps work noise, fuel consumption, high failure rate is also a fatal shortcoming, generally need to open a spare one, which virtually increases the equipment investment and operating costs. In addition, if such a pump is used to suck a condensable gas such as steam to emulsify the lubricating oil, it can only be applied to suction of non-condensable (air-based) gas or to suction of a granular medium It also limits its scope of application.
(2) water ring vacuum pump is installed in the pump housing with a multi-vane eccentric rotor rotation, the water thrown into the pump housing to form a concentric water ring with the pump, the water ring and the rotor blades to form a volume cycle so that the Gas is drawn in, compressed and drained. It has the advantage of low vacuum pumping capacity, you can directly suction steam condensable gas. Its disadvantage is the low degree of vacuum; can not be aspirated with the granular media; rotor rotation is not easy to do anti-corrosion treatment, it can not be aspirated with corrosive media.
Double girder bridge crane with hook is the widely used hoisting machinery recently. It is mainly composed of box-shape bridge, crane trolley, trolley traveling mechanism and electric control system. The load handling device is the hook.
On the girder laid rails for crane trolley to transversely move. The girder is weld with the box-shaped end girder. At the middle of the end girder and joints which are fastened with bolts for fragmented transportation of bridges. The platform is used to place trolley traveling mechanism, electric equpment and used for repair.
It has three operation models: ground, wireless remote control and cabin room. The crane can be furnished with load handling devices such as grab, electromagnetic chuck to meet the requirements of hoisting various types of materials. Crane work duty is A3~A7, the commonly lifting load is 3-250t, so it's suitable to work in factories, warehouses and freight yards, where the ambient temperature is -10℃~+40℃ and relative humidity is not more than 85%.
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XINXIANG DEGONG MACHINERY CO., LTD. , https://www.degongcrane.com