subject: Raise Crusher Competition Is Urgent [print this page] Raise crusher competition is urgent Raise crusher competition is urgent
With the continued development of domestic infrastructure and the national economy, China's construction machinery market has become the focus of attention of the international equipment manufacturers, broken machinery industry is no exception, broken machinery can usually be divided into six categories, in addition to the hammer crusher and outside the roll crusher, gravel pits of broken machinery cone crusher and impact crusher machine.
Cone crusher
The cone crusher is often used as gravel pits secondary and tertiary crushing equipment. Cone crusher to the circle diameter of the end of the cone size as criteria for the classification of the specifications.
(A) the use of performance
The performance of the cone crusher is mainly reflected in three aspects allows the feed size, processing capacity and discharge size. Spring cone crusher products on the domestic market compared with the international advanced level, the performance differences on the main feed small nesting large processing capacity and machine heavy, it is mainly a design concept backward cause.
In the 1950s, the former Soviet Union Simons cone crusher technology entering the country, the 1980s, China has a direct introduction of international technical level of the 1960s Simmons Cone machine, so far after many improvements, but the main structure is basically a big change. Therefore, in the cavity design, dynamics and kinematics design, operation and lag behind the international advanced level.
(B) the technology gap
Behind the main design agencies to achieve the laminated crushing principle (or on the extent of the material layer broken). The 1950s, the laboratory tests proved that the single particles of the material is crushed and multi-particle (forming the material layer) crushed.Mechanical reason as much as possible in its power and crush broken laminate, which can get rid of completely rely on the port of discharge to control the material grain size, in order to achieve a larger feed size, the smaller the discharge granularity and greater processing capacity. Therefore, the advanced nature of the design is broken as far as possible to create conditions for the lamination, the use of cavity design and effective measures to increase the breaking force. Spindle swing speed and eccentricity, for example, three kinds of cone crusher performance of the different stages of development are also different.
At present, domestic spring cone crusher with sliding bearings, the international community for at least four major crusher manufacturers (jci, the United States, Cedar, back many years ago telsncith and the United Kingdom pegson companies, etc.) on the use of rolling bearings replaced by plain bearings. Rolling bearings allow higher velocity than plain bearings under the same working conditions, processing capacity of more than 30% of the domestic equipment.
Crusher
The past, small and medium-sized gravel pits often fine jaw crusher as secondary crusher equipment, at present, and medium-sized gravel pits to the cone crusher.Crusher in some special occasions, such as the requirement of ore products granular cubic particularly strict (ie less elongated particles) are often used as a secondary or tertiary crushing equipment, such as high-grade construction road quarry commonly used by the type of equipment. Reinforced concrete regeneration of the urban construction waste is very popular in foreign countries due to the crusher as the main equipment is very common.
Crusher rotor diameter and the effective length as the specification criteria for the classification of typical products at home and abroad, the gap between the two aspects of product design and wear-resistant materials.
(A) Product Design
The quality of domestic and foreign products of the same specifications crusher host, however, the chassis quality of domestic products, the rotor counter-attack aircraft quality domestic product casing and rotor mass, and quality of the smaller counter-attack aircraft. Due to the small mass of the rotor moment of inertia is small, drag motor power, especially in the processing power when crushing hard rock with hope for the small particles. In addition, to fight back cavity design of different particle size requirements of the back plate adjustment and replacement of board hammer, the difference of domestic and foreign products are designed to be very clear. Poor design of these areas not only affect the product quality, and to use, maintenance, causing much inconvenience.
(B) of wear-resistant materials
As two or three broken crusher in the crushing of hard materials based mainly anti-wear parts board hammer high chromium cast iron of high chromium cast iron standard (resistant white cast iron) for small parts. Standards for quality control of large parts (such as a few hundred kilograms of board hammer) is not complete, the console manufacturers are not manufacturing wear-resistant materials, the quality of the board hammer and other wear parts easy to get out of control. Moreover, a lot of casting production enterprises lack the necessary quality control conditions, Therefore, under the same working conditions, the life of wearing parts at home and abroad is often a difference of 1.
