Konecranes-Crane

Lifting Equipment: Specs & Feasibility

In general, a protozoan lifting system stands for mechanism of designed for cyclic operation and used for lifting and moving cargo over short distances within a certain area. Lifting machines vary greatly according to the principles of action, purpose, performance, configuration serviced area and etc..

The most common type is the general purpose machines: with universal constructions, they are designed to perform only lifting and transport operations. In particular, such mechanism typically features a self-propelled crawler and mobile crane for general use. Perhaps, the main advantage over other types of cranes lies in its high mobility: ability to quickly move the lifting device from one place to another, install the lifting platform on almost any soil foundation without significant training; compactness usually complements the list of benefits. The obvious advantages look not that brilliant – limited load capacity and too compact dimensions.

Self-propelled cranes with a special truck-mounted chassis is designed for construction, installation, handling, emergency – rehabilitation works on the dispersed objects.

Typically such machines’ hooks are mounted on the telescopic shaft length of 10.6 m to 36.7 m; auxiliary hook can be used as an extension (9.5m or 16m). The crane functioning with the load characteristics is allowed only with the use of the outriggers.

Truck-based lifting machine can be packed with a tower-shaft mechanism and can operate under a certain load or without it, without requiring special balancing mechanisms as stability is provided by gravity. Truck crane is the most common type of mobile jib cranes. The truck cranes are built basing on the mass-produced chassis of trucks with the installation of the frame front and rear outriggers for stability during operating. Their weak points are poor ability to move across offroads and gradeability of up to 25° only.

The strongest suit of mobile cranes is their high mobility, which allows them moving quickly to remote objects. When transporting by rail re-mounting is not required, since they fit into the size of rail transport.

Here are the main types of truck cranes:

  • Trucks with telescopic boom and rigid suspension.
  • Trucks with stack boom with flexible suspension.
  • Tower-boom trucks.
  • Trucks with booms featuring jib.

The systems may be upgraded with extension sections (inserts) or drawers with telescopic lengthened booms and jib booms. Modern lifting devices are taken advantage of in construction and installation sites, in handling, energy construction, they are mainly used for loading and unloading, and as auxiliary crane for assembly operations at zero and minus marks.

The economical feasibility is among the first factors having a direct impact on making the choice in favour of this equipment. Thus, Granada Material Handling, a top UK league industry representative, specialized in lifting equipment inspection and lifting equipment services, claims an average system used on railway junctions pays for itself within the first to years of exploitation. Giving the pace of logistics development, lifting equipment usage gains momentum steadily and consistently, providing companies like GMBH with an opportunity to look beyond domestic market.

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Making The Most Of The Ultrasonic Cleaning

Ultrasound boasts a multifactorial effect, so its application can significantly accelerate any of the cleaning methods and improve the quality of final results. Alternating pressure fluctuations of fluid particles and acoustic phenomena, the ‘sonic wind’, cavitation and ultrasonic capillary effect offer unparalleled efficiency.

The nature of the effect

The primary energy role is played by cavitation. During the collapse of the cavitation bubbles microstreams are formed and cumulative fluid velocity reaches a hundred meters per second, towards the surface to be cleaned. Under the influence of shock waves and high-speed microstreams an intensive film degradation of impurities (solid or liquid types) and its separation from the surface takes place. Cavitation provides intensive ultrasound emulsification of liquid and ultrasonic dispersion of separated solid contaminats.

Due to acoustic streaming is provided by removal of the boundary layer solution or destroyed under the influence of cavitation in the volume of fluid contamination. A particularly important role is played by acoustic streaming in removing soluble contaminants.

Cleaning efficiency increases when the surface to be treated to the emitter is reduced. However, placing the product to the emitter in less than 1-2 mm is impractical because at small gaps between the transmitter and the surface conditions remove contaminants from the boundary layer and decreases the activity of cavitation due to changes in the collapse scheme of cavitation bubbles.

The benefits

The advantage of ultrasonic cleaning is not only an ability to achieve high-quality cleaning test surface from a wide variety of contaminants, but also to remove impurities from the capillary cavity defect. The most effective use of ultrasound is the mode that provides an emergence of ultrasonic capillary effect. The mode contributes to reagent capillaries filling to a greater depth and a greater rate. In addition, significantly accelerates the diffusion of dissolved gas to the mouth of the defect; dissolution of contaminants presents in the cavity of the defect; the diffusion of impurities to its mouth. As a result, accelerates the process of filling voids and defects in general and increases the depth of penetration of the working fluid in the blind capillary channels. The mode is supported in neoteric equipment, such as Hilsonic – a seasoned UK-based business, focusing its effort on studying ultrasound and producing an impressive line-up of ultrasonic cleaner devices.

The use of ultrasound for cleaning can significantly improve quality control. Thus discontinuities are cleaned to a sufficient depth not only in case of liquids, but also such contaminants sparingly as polishing paste. As a result, the number of identified traces close to the total number of defects is taken into account. The use as a detergent liquid water and aqueous solutions of glycerol and a dispersing agent for cleaning in an ultrasonic field is more effective than the use of solvents such as acetone or benzene. This is due to greater activity of acoustic cavitation in water and aqueous solutions than in acetone and petrol. The use of ultrasound allows solving the problem of replacing explosive, environmental hazards to more environment-friendly materials.