Hoisting machinery can be divided into light and small lifting equipment, elevators, cranes and overhead monorail systems according to different structures. Light and small lifting equipment mainly includes lifting blocks, spreaders, jacks, manual hoists, electric hoists and ordinary winches, most of which are small in size, light in weight and easy to use. Except for electric hoists and winches, most of them are driven by human power and are suitable for occasions where work is not heavy. They can be used alone or in some cases as lifting mechanisms for cranes. Some light and small lifting equipment has a large lifting capacity. For example, the lifting weight of a hydraulic truck crane has reached 750 tons. The lifts are mainly used for vertical or near vertical lifting movements with fixed lifting paths, including elevators, lifting platforms, mine hoists and hopper elevators. A crane is a multi-action hoist that vertically lifts and transports heavy objects horizontally within a certain range. The overhead monorail system has lines formed by rigid hanging rails that can transport materials to various parts of the plant or to the exterior of the plant.
Crane machinery basic mechanism
The use of various lifting appliances is different, and there are great differences in construction, but they all have a lifting mechanism that realizes the basic action of lifting. Some hoisting machinery also have an operating mechanism, a luffing mechanism, a slewing mechanism or other specialized working mechanism. The material can be lifted and lowered by a flexible member such as a wire rope or a lifting chain, or it can be lifted by a screw or other rigid member.
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Sealand mass flow meter is designed and produced according to world`s latest Coriolis technology with exelent appearance, stability and accuracy to measure mass flow rate of a fluid traveling through a tube, widely applied to alternative energy, oil & gas, chemical, food & beverage, industrial energy, marine, power, pulp & paper, water & wastewater industries, etc.
Mass flow meter measures the mass based on Coriolis effort. The operating principle involves inducing a vibration of the tube through which the fluid passes. The vibration, though not completely circular, provides the rotating reference frame that gives rise to the Coriolis effect. While specific methods vary according to the design of the flow meter, sensors monitor and analyze changes in frequency, phase shift & amplitude of the vibrating flow tubes. The changes observed represent the mass flow rate and density of the fluid.
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