The Composition and Crushing Principle of Jaw Crushers

Jaw crusher mainly consists of frame, supporting device, the working mechanism (fixed jaw plate and moving jaw plate), drive mechanism (eccentric connecting rod, thrust plate, flywheel and eccentric shaft), safety device and adjusting device of ore discharging port (wedge adjustment device, gasket adjustment device). The working parts of jaw crushers are two jaw plates. The first one is the fixed jaw plate (fixed jaw), vertically (or the upper end slightly camber) fixed in front of body wall, and the other mobile jaw plate(moving jaw) is located tilt and connected with fixed jaw to form the next upper big and lower small crushing chamber (working chamber). The mobile jaw plate moves towards the fixed jaw plate to do periodic reciprocating motion, sometimes separately and sometimes closely. During the Separation, the material going into the crushing chamber and the finished product is discharged from the lower port; when they are closed, the material is squeezed between the two jaw plates and broken by bending and splitting.
Breaking is a basic procedure during the preparation of raw materials and processing work, and its purpose is to control the particle size of the raw material to achieve the requirements of blast furnace smelting. Jaw crushers and cone crushers all can be used to break hard and medium hard ore and stones. And the structure of cone crusher mainly consists of frame, horizontal axis, moving cone, balance wheel, eccentric sleeve, the upper breaking wall (fixed cone), the lower crushing wall (dynamic cone), fluid couplings, lubrication system, hydraulic system and control system.
Jaw crushers have a variety of structural forms, but their working principle is the same, namely, by the periodical cyclical movement of the movable jaw to break materials. During the process of mobile jaw waving to the fixed swing plate, materials located between the two jaw plates would be crushed, split and bent.

Vibrating Feeder is a Necessary Device in Sand Producing Line

The feeding machine produces centrifugal force depending on the rotation of the eccentric block in the vibrating device to make the sieve and vibrating device move in circle or nearly circle. Materials are continuously thrown on the surface of the sieve together with the sieve box, and are transferred into the receiving port continuously and evenly.
Electromagnetic vibrating feeders are widely used in automatic production, such as machinery, electronic product, food and pharmacy manufacturing. As electromagnetic vibratory feeder’s structure, orienting mechanism and driving system are determined and affected by the diverse materials’ characters, shapes, and surface features and feeding demands, The matching of multi-performance and multi-factors is still a big headache. Therefore, further study and experimentation the kinematics and dynamics of electromagnetic vibratory feed are necessary for design. Researches of the kinematics and dynamics of electromagnetic vibratory feed system by theoretical and experimental approaches for the vibrating chassis and materiel orienting are described. Analyzed the working principle of electromagnetic vibratory feeding system and established the mathematic models of kinematics and dynamics of electromagnetic vibratory fluted feeding system, the critical conditions of the sliding and tossing are given, and the relationship between natural frequency and vibratory frequency is given in the amplitude-frequency curves as well.
The ore feeding machine is used to distribute bulk and granular materials to receiving equipment evenly, timely, and continuously from the storage bin and other storage devices. In the sand producing line, the ore feeder is used to feed the crusher continuously and evenly, and to coarsely separate materials just like the valve of adjusting the current volume, which is the necessary equipment in automated flowing line. The mineral feeding machine is widely used in metallurgy, coal mine, ore beneficiation, construction, chemical industry and materials grinding industry. Factors should be considered when we choose a vibrating feeder include the feeding amount, adjusting range, feeding accuracy, the characteristics of materials, installing way, outer size, safety and reliability, environmental protection and self-weight.

The Preheating Process of Rotary Kiln during Ore Beneficiation

Preheater uses the waste heat of rotary kiln and calciner to heat the raw material in the aim of preheating the raw material and decomposing part of carbonate. The main forms of preheaters are cyclone, shaft, and cyclone-shaft compound preheater. The preheater mainly consists of the cyclone (cylinder, cone, inner cylinder, volute, back mixing cone drop Board), links duct, the discharge pipe and flap valve, sprinkle bins, material clearing holes and temperature and press testing devices.
Rotary kiln, suitable for the process of various industrial materials sintering, roasting, volatilization, calcining, isolation for its strong ability to provide good mixing and effectively heat transferring, has been widely used in metallurgical, concrete, usalite and chemical industrial process. However, rotary kiln still has some difficult control problems, such as complex mechanism process, high frequency changed production condition, multi-variable, strong coupled, strong nonlinearity, large lag, non-determinism, thus conversional control strategy cannot reach automatic control. Most of rotary kilns are still under manual control with human operators. As a result, the operator’s workload is high and the product quality is hard to be kept consistent. Furthermore, the kiln running rate and yield remains low and energy consumption remains high. Therefore, it is significant to research automatic control and optimization technology of the rotary kiln sintering process to improve product quality and save energy. The cement rotary kiln sintering process is a typical distributed parameter system. The gas temperature distribution and solid temperature distribution correlate each other along rotary kiln aix, which are restricted by the adjusted control variable in different time scale and the process disturbance.
The materials are fed from the feeding port, spreading and hanging in the air immediately. Heat transference between gas and solid happens immediately in a high speed. 80% heat happens in the connecting pipe, and only less than 20% happens in the cyclone cylinder. Most parts of the preheater is made by metal, and some parts may be made by heat-resistant steel according to the requirements, and the heat-resistant steel can work under 1000~1100 Celsius degree. Besides, the design of refractory break is much novel with good seal, which can make sure the materials can reach their required temperature in the preheater. During the whole process of preheating, materials move from top to bottom, and the hot air moves from the bottom to top. Full heat transference happens between materials and the hot air, and part of the waste gas will be discharged from the air outlet of cyclone through discharging pipe.