3results about How to "Reduce vacuum" patented technology

The utility model provides a novel negative pressure conveying system, including feed hopper, vacuum feeding machine and negative pressure fan, and feed hopper and vacuum feeding machine are connected through material conveying pipeline between, and vacuum feeding machine and negative pressure fan are connected through gas supply pipeline between, along the direction of conveyance, and the air supplementing valve and the broken empty valve are set gradually on material conveying pipeline. This novel negative pressure conveying system installs the broken empty valve in material conveying pipeline, can effectively reduce the material accumulation in material conveying pipeline in the process of unloading.

The present application relates to the field of mechanical assembly and hoisting, in particular to a cylinder head hoisting device and method for large low-speed diesel engines; the device comprises a main hook, a variable stiffness joint, a lifting tool frame, four double-acting hydraulic cylinders and cross pipelines; the device connects the rodless cavities of the four hydraulic cylinders diagonally through the cross pipelines to build two closed fluid networks; the core is that when the hoisting gravity center deviates, the eccentric load tension forces the hydraulic oil to flow spontaneously between the diagonal hydraulic cylinders, thereby synchronously extending the equivalent sling length of the eccentric weight side and the diagonal side, making the diagonal line as a whole sink to maintain a horizontal posture; the present application discards the complex external leveling mechanism, directly realizes the self-adaptive leveling of the lifting tool frame by using internal fluid physical flow, effectively overcomes the inclination problem caused by eccentric load in traditional hoisting, and provides a stable horizontal posture for cylinder head lowering.

The utility model relates to a floor brush and cleaning equipment, floor brush includes floor brush main part, at least one roll brush group and connecting structure, floor brush main part is equipped with the suction cavity with opening, same roll brush group includes at least two roll brushes, the roll brush can rotate around the central axis, the adjacent two roll brushes of same roll brush group are connected through connecting structure, make the included angle angle between the two roll brushes of being connected variable in the nonparallel horizontal plane preset plane. The adjacent two roll brushes of same roll brush group are connected through connecting structure, make the included angle angle of the two roll brushes each other variable, can improve the cleaning effect of floor brush on the non-flat surface.