Affected by traditional concepts, it is believed that sand and gravel only fill in the concrete, the quality is not important, as long as more cement is added. But that is not the case. The amount of aggregate of sand and gravel accounts for about 50% of concrete, and its properties have a significant impact on the workability, mechanical properties and durability of concrete. Among them, the needle-like content in the aggregate of sand and gravel is one of the important indicators. How to control the needle-like content has always been a concern of everyone. If there are too many needle-like particles in the aggregate of sand and gravel, it will have an adverse effect on the quality and workability of the concrete. The amount of needle-like content in the aggregate is closely related to the process and the type of rock. Usually, the needle-like particles in the gravel are controllable. From the aspect of particle size, the probability of large-particle aggregates appearing needle-shaped is relatively small. The 5-16mm gravel has a higher number of times of crushing and processing, and the probability of needle-like shape is relatively large; from the perspective of equipment technology, Usually the jaw crusher is high and the counterattack is relatively low. Therefore, the manufacturer needs to select a reasonable process according to the characteristics of the rock. You can also ask the experts of the design institute to help design and select the equipment. At present, there are many sand making machines on the market. Although the crusher is only a kind of equipment in the sand production line, it is indeed an important equipment. The quality of the crusher directly affects the production of the whole sand production line. The quality of gravel aggregates! If we want to reduce the content of pellets in the production of stone aggregates, we need to pay attention to the crushing process!
A Tower Crane is an inverted L-shaped structure that is capable of lifting several tons of weight to precarious heights.
The most striking feature of this crane is that it is self-building and can allow a building to be constructed adjacent to or even around it.
Tower crane mast section ( tower crane mast and tower crane basic mast ) is a steel structure with a normally square section, whose main mission is to provide the tower crane with sufficient height.
Normally it is formed by lattice modules that facilitate the transport of the crane. For assembly, these modules will be joined by screws, all of which will be connected to the projected height. Its shape and dimension vary according to the necessary characteristics of weight and height.
BQ also supplying other Steel Structure spare parts of tower crane like Basic Mast Section, Fixing Angle (or Reusable Fixing Angle), Anchorage Frame,Telescoping Cage Jacking Cage, Tower Crane Yoke, Hook and so on.
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The crusher will inevitably produce less qualified products in the crushing process. For the sand making industry, the unqualified product is the needle-like particle content higher than a certain proportion. Some manufacturers believe that the needle-shaped particles are also not too much impact on sand and gravel. In fact, this idea is wrong!