According to the vibration source, it is divided into self-centering vibrating screen and exciting screen. The traditional self-centering vibrating screen machine drives the eccentric shaft through the motor and pulley. The eccentric shaft is connected to both sides of the screen box through the flange of the bearing seat, and consists of an eccentric shaft, a bearing seat, a flywheel, a pulley and a sleeve. This traditional structure requires a long shaft with great strength and stiffness. During maintenance, the shaft is suspended by lifting equipment, and the transmission can only be installed on the side, which is noisy. Through the research and analysis of the traditional screening machine, the vibration source is used instead, the small screening machine is directly replaced by the vibration motor, and the large screening machine is realized by the vibration exciter. Many domestic manufacturers of screening machines have applied for patents, which are widely used in screening machines. The principle of vibration exciter is that two motors are respectively driven to a group of shafts with eccentric wheels through a pair of universal joints. Each supporting shaft has two groups of eccentric wheels as vibration sources, and the shaft is fixed on the support of the vibration exciter through bearings. The vibration exciter can be placed on the upper and rear sides of the screen according to the actual position. In this way, the screen machine can be divided into two parts: the screen box and the vibration source, and the vibration force can be adjusted by adjusting the eccentric wheel. Now it has been widely used in mining industry. Through the configuration of vibration exciter, circular vibration and linear vibration can be realized. The conventional vibration exciter (the power of motor) vibrates in a circle, which has the characteristics of large vibration power, large screen inclination and large handling capacity. The linear vibration of materials can be realized by the reverse operation of the power sources of the two vibrators, which has the characteristics of small vibration force and high screening efficiency. Classification by screen: from the material point of view, it is divided into better spring steel, ordinary 45 steel and A3 steel, and now it has developed into inorganic nonmetallic materials such as polyurethane, which has the characteristics of wear resistance and low noise; Structurally, it can be divided into perforated steel plate and welded round steel. The former has low opening rate, high productivity and poor screening efficiency, which is completed by a punch with large investment and high cost, while the latter is welded by a welder with relatively simple process. According to the shape of sieve holes of vibrating screen, it can be divided into square, round and comb-toothed. Square and round are cloth specifications, which can realize accurate particle size, large opening and high productivity. If the particle size is greater than 40 mm, it is necessary to comb the holes to avoid plugging the holes. From the use point of view, vibrating screen is used to separate powder. As a grading material, there are many screens, so there are many kinds of materials. For example, there are three kinds of materials: above-screen, in-screen and below-screen, which can realize the separation of various materials.
Common faults in use and their solutions
The poor screening effect encountered in the process of use is mainly caused by the thick material layer and the blockage of screen holes. The thickness of the material layer should be reduced and the screen of the vibrating screen should be cleaned in time; If the vibration is too large or too small, it is necessary to adjust the eccentric block according to the actual situation and achieve the best by adjusting the amplitude; Bearing overheating, check bearing and seal; Check whether the vibration and the base part are hard connected and whether the spring and elastic block are damaged in time. Choosing reasonable parameters is the key to use the equipment well. Generally speaking, the vibration performance of screening machine has several parameters, one is vibration force and the other is amplitude. From the vibration form of the screen surface, there are linear vibration and circular vibration. The classification is rich, but the key is that it can only be adjusted by adjusting eccentricity until it is suitable. Structural design and future development direction of vibrating screen: vibrating screen is gradually developing in the direction of light, large, beautiful, firm and durable.