The configuration of SCSs -sliding gates -can be divided into slide gates and revolving (rotary) gates: in slide gates, the movable refractory slab undergoes reciprocating motion; in revolving gates, the same slab undergoes rotation. Among the advantages of revolving gates is the greater durability of the refractory slabs (the possibility of closing the steel-pouring channel many times) and the smooth control of casting speed. However, such gates also have serious deficiencies -they are complicated to make, assemble, and repair, they are unwieldy, and the rubbing metal parts undergo a large amount of wear; the advantages of these gates over slide gates are more noticeable on large (larger than 130 tons) ladles [1].In light of the above and the absence of domestic refractories suitable for making the refractory slabs of revolving gates, slide gates have become the type most commonly used. Among their advantages over revolving gates are convenient assembly and servicing, small dimensions, simpler design, and the fact that less labor is involved in making the refractories which are used in slide gates.Study of the condition of SCSs at Russian metallurgical plants showed that most factories use slide gates of the original design, the majority of which are of the rigid type. A wide range of refractories is used for the given equipment [1]. In such gates, the clamping force on the refractory slabs is created by tightening bolts. This makes it difficult to control the force and is the reason that the force changes when the parts of the gate are heated; the motion of the movable slab changes the force ratio at points equidistant from the axis of the pouring channel, which can cause metal to flow between the slabs and the result in jamming of the drive. In addition, replacement of the refractories in rigid-type gates and tightening of their refractory slabs must be done outside the ladle in specialized gate repair shops, and a special section for press-fitting the slabs and drying the gates in furnaces is needed to install the refractory slabs with the use of lime mortar.At domestic plants, the designs of metering systems of the slide-gate type (many of which are obsolete designs made in Romania) do not permit the accurate casting of several heats through a single set of refractories, with the discharge of the metal being smoothly regulated. This problem arises because of the difficulty in restoring the slab-clamping force and the fact that it is impossible to visually check the condition of the refractories between heats [2].The wide variety of slide-gate metering systems now in use is a reflection not of a difference in service conditions, but of the absence of a standard design methodology in this country.An analysis of the designs of slide gates made by several companies (Flocon, Vesuvius, Interstop, Uberzetta, etc.) showed that together with their advantages (repeat use of the refractories, the fact that the refractory slabs are used inside metal shells and elastic elements, reliability of operation, the lack of a ne...
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The article deals with the development of devices for mechanization and automation of metal flow control – steel-pouring ladles sliding gates of the new generation of Vulkan-TM production, the history of their production.The various technical solutions underlying the creation of the sliding gates of the «VT» series, innovative solutions used in design of the sliding gates layouts and their competitive advantages are shown.The design and operation principle of the new development – the device for gas-dynamic protection of the metal stream from secondary oxidation is described.
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