As a widely used rough breaking equipment, jaw breaking has a hundred years of development history. At present, there are certain differences in the structure, shape, design, material and other aspects of the jaw break on the market, this paper mainly from the crushing chamber, frame, discharge port adjustment, motor installation, bearings and other 7 aspects of the introduction, I hope that everyone in the purchase of clear needs, buy satisfactory products.
01 Crushing chamber
The traditional crushing chamber is a “right triangle”, the fixed jaw is a straight edge, the moving jaw is a beveled edge, and the new crushing chamber is a “symmetrical isosceles triangle”. Under the same inlet size, the allowable feed particle size of this type of crusher is 5% larger than that of the traditional crushing chamber. The relationship between the feed port size D of the traditional crushing chamber and the maximum feed particle size F is F=0.85D. “Symmetrical isosceles triangle” crusher F=0.9D.
The Angle between the jaw and the fixed jaw or the size of the “mesh Angle” is a major parameter to measure the performance of the crusher, the smaller the Angle, the greater the crushing force, the higher the crusher of the same feed port size, the greater the processing capacity, the advanced Angle between 18°-21°, the traditional PE crusher Angle between 21°-24°, The crusher with small meshing Angle has high requirements for the manufacture and processing of the body, shaft and bearing due to its large crushing force.
02 Rack
The structure of the broken jaw frame is various, including welded frame body, bolted frame body, open frame body and box frame body. Metso’s C series jaw crusher uses an open bolt connection frame body, which has the advantage of removable transport, strong adaptability to underground engineering, and the frame repair is more convenient, but the disadvantage is that the assembly requirements are high, not to ensure the installation accuracy; Sandvik’s CJ series jaw breakage is the use of box-type cast steel welded frame, high strength, good structural stability, processing and manufacturing accuracy is easy to ensure, the disadvantage is that the frame must be the whole transport, for the oversized jaw breakage, to consider the transport road situation.
03 Discharge port adjustment mechanism
There are a variety of jaw opening adjustment mechanisms, the more common main “gasket” adjustment and “wedge block” adjustment, “gasket” adjustment is convenient and reliable, easy to process and manufacture, “wedge block” adjustment operation is convenient, but the reliability is not as good as the “gasket” type. In recent years, a “hydraulic cylinder” has been developed to replace the elbow plate and the adjustment mechanism of the discharge port, and this crusher has obvious advantages in the mobile crushing station.
04 Motor mounting type
There are two ways to install the motor: one is to place the motor on the crusher frame (integrated), the use of triangle belt drive, the crusher and the foundation generally use rubber gasket elastic connection; The other is to install the motor on the foundation (independent), then the crusher requires to be connected with the foundation bolt. The former installation has a small disturbance to the foundation, but due to the limitation of the distance between the motor and the crusher pulley, the belt package Angle is small, so it needs multiple triangle belts to meet the requirements of the functional transmission, in addition, it also requires the quality of the motor to be reliable, so as to avoid insulation damage during the motor vibration process; The motor is installed on the foundation, the crusher has a large disturbing force on the foundation, high requirements on the foundation, and the cost of the civil structure of the foundation is increased.
05 Type of bearing and bearing seat
Bearing is the core parts of the jaw crusher, high value, high reliability requirements, once the problem is often high maintenance costs, maintenance time is long, therefore, bearing and bearing housing-related components design and manufacturing requirements are strict. Bearings generally choose double row tapered roller spherical bearings, for the frame housing, some choose integral housing, some choose semi-open housing. Semi-open bearing seat installation should be extra careful, otherwise the installation is not good, easy to make the bearing uneven force, resulting in bearing damage, but the semi-open bearing seat is easy to quickly install and disassemble, such as the United States Astec (Astec) company used this type of bearing seat. For domestic jaw breakage, it is recommended not to use this semi-open bearing seat as much as possible.
06 Start and control
The main motor can start directly, start with electronic soft starter and start with variable resistance. Direct start is generally for small jaw break, the motor power is not large, the power grid capacity allows; Rheostatic starting is suitable for winding motor, because the winding motor has large blocked torque, it is more suitable for the working condition of the crusher, so this starting mode is more common; The electronic soft start is configured for the rat dragon motor. For the overall installation of the motor and the crushing frame, the rat dragon motor is generally selected, and the start of the main motor is electronic soft start. 07 Speed and stroke of the crusher
Compared with the speed and stroke of domestic PE jaw break, the products of the main international jaw break manufacturers have larger speed and stroke. The mesh Angle, speed and stroke of the jaw break affect each other, the speed is determined by the number of times the material is broken and the discharge speed through the crusher, not the faster the better, the faster the speed, the broken material has not had time to fall and suffer extrusion crushing, the material can not be discharged from the crusher, the speed is too slow, the material is directly discharged from the crusher without crushing; The stroke determines the size of the crushing force, the stroke is large, the crushing force is large, the crushing effect is good, the size of the stroke is determined by the crushing hardness of the rock; With the different height of the crusher crushing chamber, the speed of the crusher also changes accordingly.
With the development of crushing equipment technology, the speed of product replacement is accelerated, users should understand the characteristics of different types of products when purchasing equipment, understand the relative advantages and disadvantages, a lot of inspection, shop around.
Post time: Oct-25-2024