Unlike the hammer crusher hammer, which pays attention to the service life, the hammering machine processing contract has a special regulation when it is signed, that is, the time limit for the use of the hammer head is clearly specified. This is because of what reason? Mr. Ma, the head of the accessories department of Zhengzhou Dingsheng Engineering Technology Co., Ltd., explained the following:
The clinker crucible crusher is used for the breaking of the clinker from the cooling end in the last stage of the grate cooler. Since the clinker has a certain temperature, for the large gold hammer of the high manganese steel matrix, The normal use temperature of high manganese steel is below 50 °C. As the temperature of use increases, it is equivalent to tempering high manganese steel.
The temperature at which carbides are precipitated in the austenite structure of high manganese steel is 125 ° C. With the increase of tempering temperature, the time is lengthened, the process of decarburization of carbides in austenite is accelerated, and carbides are formed on the austenite matrix. The amount of diffuse precipitation increased. When the temperature is further increased and the holding time is prolonged, the carbide will aggregate and grow. When the carbide exceeds 400 °C, the continuous grain-like distribution of the grain boundary will occur, and the intra-crystalline needle-like carbide will appear, as if it has returned to the as-cast state. organization.
However, when a temperature of more than 400 ° C occurs or 300 ° C for a long period of time, the impact toughness sharply drops, and a so-called "toughness trap phenomenon" occurs. Thereby, the impact toughness of the high manganese steel is lowered, the fatigue strength is lowered, and the hammer head is broken.
Therefore, although the hammer of the Dajin tooth material has a long service life for the broken cement clinker, it is not always usable. Especially when the cooling effect of the grate cooler is poor, the high temperature clinker enters the crusher immediately after the crusher, the temperature inside the crusher is very high, and the hammer of the grate cooler is equivalent to tempering in the tempering furnace for a long time. In addition, the frictional heat of the hammer hole and the hammer shaft increases, and the impact toughness and fatigue strength of the hammer shank decrease continuously with time. When the limit is lowered, the hammer shank breaks.
Therefore, the hammer of the grate cooler is not like the limestone crusher hammer can be used on the machine for a long time, and has a service life. Under normal circumstances, the high manganese steel chiller hammers of other manufacturers, without alloying, use 2-4 months, it is too late to change the impact toughness. The hammer teeth of the Dajin tooth type grate cooler produced by Dingsheng Company are generally used for 4-12 months due to the large increase in wear resistance. This will result in the use of the hammer head exceeding the specified time limit, and the impact toughness of the hammer head will fall and break.
Therefore, when the company signed the contract for the hammer of the grate cooler, according to the user's use temperature of the grate cooler, in the terms of the contract, the time limit of the hammer is clearly specified, and the user should understand that: "The hammer of the grate is not worn. It is only necessary to change the hammer when it is impossible to break the clinker, but to change the hammer head regularly according to the temperature inside the crusher."
Concerned about surprises
Tag: grate cooler hammer head impact toughness use temperature sand production line
Previous: Cavitation of Changyuan Centrifugal Pump Next: Advantages and Disadvantages of Chrome Plating
Cheap Steel Door,Mother Son Steel Door,Africa Door
Steel Door,Toilet doors,Wood Door Co., Ltd. , http://www.steeldoors-manufacuturer.com