The first step on the cooling bed, made a brief overview of the cooling bed status and development. Cooling bed, the quality of steel products as an important part of modern industrial production plays a vital role. Then introduced the cooling bed classification, including reciprocating multi-claw type cooling bed, chain cooling bed, walking beam cooling bed, flip the cooling bed, swing-type cooling bed, roller-type cooling bed, as well as a variety of cooling bed features . Deepen their understanding of the factory.
     Cooling bed, lifting chain, this general-purpose machinery design as a graduate design topics, to develop an independent ability to solve practical engineering problems, have learned the basic theory and professional knowledge of the integrated use of this graduation project is also our design, computing and graphics capabilities have been fully training.
1.1 cooling bed applications
    Cooling bed, metallurgy rolling steel industry, rolling products (rebar, round bar, pipe, etc.), effectively cooling the work surface.
    Main purposes: cooling bed equipment is mainly used for rolling steel plates online slow natural cooling. Profile production line, cooling bed with pre-curved profiles also prevent profiles in the natural cooling process of the entire quality ranging from lead to irregular bending.
     The walking beam cooling bed is one of the critical equipment in today's bar rolling production line, the main function is to receive, transfer and cooling rolling.
1.2 development trend of the cooling bed
     Cooling bed rolling production line equipment, a key link to connect the high-temperature processing and cold, regulate even a region of uneven processing efficiency has played a buffer role.
     On the other hand, compared with the mill, flying shear, and other processing equipment, large tonnage cooling bed equipment, a wide area, manufacture and installation more difficult.
     In the entire production line design, manufacture, installation, and so on all aspects of China is still a wide gap with foreign outstanding enterprises. Drawing regard for absorbing foreign drawings, and independent production. In the independent intellectual property rights is weak. Due to the design drawings as a reference of foreign technology, coupled with the shortage of time. Therefore, in the specific production and manufacturing, prone to all kinds of unexpected problems in specific aspects of the installation process. There is sufficient accumulation of multi-technology and practical experience in foreign countries in this regard. Japan's Mitsubishi, Nippon Steel, Siemens VAI, the United States iron this and so are the technology leader in this regard.
     Foreign countries has been high-end technology blockade against China, China in the field of cutting-edge development is relatively slow. However, in recent years, in order to speed up the modernization of the country vigorously develop the manufacturing sector, and encourage all kinds of capital into heavy industry. Strengthen intellectual property protection, and increasing investment in education, emphasis on high-end talent cultivation. China's rapid development in the field of modern manufacturing. Steel production line equipment, the vast majority of independent production, although the level of processing, manufacturing precision and product quality is a little gap with foreign countries, but this gap is gradually narrowing.
1.3 cooling bed classification
    Cooling bed is rolling shop, as long as the equipment, its role is more than 800 ℃ rolling cooled to below 150 ° C to 100 ° C, while making the tie pieces set the direction and established speed run during transport shall ensure that the tie pieces bend or to develop the direction of bending. Significant differences between the shape of the steel products, steel workshop of the cooling bed form is varied.
    Cooling bed structure in accordance with the steel shop, cooling bed the following classification.
(1) reciprocating claw-type cooling bed
     Bed by a number of fixed guideway (rail, slide), the shift of steel equipment with a program claw as a whole or single pulley rope back and forth dragging. Cooling bed structure is simple, solid and reliable, easy to maintain, but its low utilization factor, consumption of the pulley wheel and roller rolling in the traverse process prone to bending phenomenon, and the noise, this cooling bed mainly used for cogging and medium-sized steel rolling workshop.
(2) chain cooling bed
     Chain cold bed of the body is generally a fixed cooling stand and chain pull steel machine part. Chain pull steel machine roller chain plate due to the constraints of the chain tensioner is usually irreversible, driving wheel should be installed in front of the rolling Traversing direction. Some chain located in the cooling bed inside the chain to bring security program claw to boost the profile forward; some chains in the cooling bed, the chain holding the profile forward. The cooling bed structure is compact, easy maintenance, no noise; drawback is the chain in high temperature conditions, the chain is easily deformed, the need to equip them with specialized cooling equipment. This cold bed suitable for all sections of steel; straightening machine and check the bench chain cold bed is a good results in the form.
(3)stepping cooling bed
      Stepping cooling bed, also known as the rack type cooling bed, the body formed by two racks, a set of rack is fixed (static rack), another set of rack can be done to the plane down reciprocating motion (moving rack). The two sets of rack tooth alternately arranged in the cooling bed is not working, static rack above the moving rack tooth surface. When you start your motor, the eccentric wheel rotation, so that the lift reciprocating installed in both front and rear dynamic beam moving rack. With the move rack mobile will be able to traverse the profiles on the static rack once a pitch, traverse profiles in the cooling bed, the movement of the body, and gradually cooled down. This cold bed suitable for the cooling process and prone to bending and torsion of small steel production. In the some serrated cold bed in order to ensure uniform rolling of cooling, static rack and move the rack is not parallel with the direction of the cooling bed length, generally a small angle (2 °). Not before rolling further, the parts in contact with the tooth surface along the length of the rolling direction changes in time, full-length along the rolling point of contact to cyclical changes. This is necessary for high-alloy steel and special profiles.
(4)Turn the cooling bed
     More advanced flip-type cooling bed, composed of two teeth beam and the eccentric shaft. Beam, two teeth of different tooth gear beam 1 is V-shaped teeth beam 2 is U-shaped. When the eccentric rotation of the axis A, eccentricity AB so that the beam up and down movement, eccentric AK, AZ, about two teeth beam movement. In this movement, proud steel flip. The flip-type cooling bed with energy saving, short cooling time, cooling steel, straight and without injury, main applications and Vincent Fang (blank) (blank) and round bar cooling.
(5)swing-type cooling bed
     The swing-type cooling bed the main components of the swing lever whenever the swing rod swing steel in a cold bed to move a pitch. Along with the swing lever repeatedly swing. Steel in a cold bed to continue moving forward. The swing of the advantages of the cooling bed is just an idiot straight line in the cooling bed moved, compared with the rack cooling bed, its simple structure, low cost, easy fabrication. The disadvantage is that sometimes damage the steel surface.
(6) roller-type cooling bed
     The roller cooling bed by a group of slender roller. The axis of the roller and rolling run direction at a certain angle, the rolling traverse movement on side, side of the rotation, such rolling not only to cool evenly and do not bend and reverse. Such a higher cost of cooling bed for demanding small steel production.
     Chain and walking beam cooling bed equipment cost more than claw-type cooling bed, but the rolling the Traversing process does not produce friction with the bed slide, and the formation of surface scratches and other defects, and good heat dissipation. cooling capacity, and therefore is widely available, rope roller claw-type cooling bed has to be phased out.