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Ultrasonic Sieving System

FAQ
  • Q: How can ultrasonic vibrating screen speed up vibration?
    A: The ultrasonic vibrating screen uses the weights at both ends of the vibrating motor to generate different rotation modes for screening with different principles. It can bring different excitation forces according to the characteristics of different materials. At the same time, it can adjust the included angle between the adjustable eccentric block and the fixed eccentric block to change the movement track of materials on the screen surface, accelerate the vibration and change the residence time, so that the vibrating screen can complete the screening of various materials.
  • Q: How to adjust the vibrating screen motor weight:
    A: Among the upper and lower weights of the vibrating screen motor, the upper weight cannot be adjusted. You should open the adjusting hole of the bottom barrel of the vibrating motor, loosen the fixing bolt of the lower weight, and then adjust the phase angle of the upper and lower weights in the opposite direction of the discharge port according to the trajectory of the materials you screen. After a little adjustment, put a small amount of materials into the screening machine to check the movement trajectory of the materials on the screen surface. If the processing parameters reach a good effect, Tighten the bolts for setting the weight and install the adjustment hole of the bottom barrel when the machine is stopped. The adjustment is completed. The vibrating screen can also control the horizontal vibration amplitude and the vertical vibration amplitude of the screen surface by adjusting the number of counterweights and the number of upper and lower eccentric blocks, so as to control the excitation force. Consult the manufacturer before adjusting the included angle of the motor and the weight or adding or reducing the counterweight, and master the method to adjust it. If the included angle is not adjusted well, it will directly affect the screening effect and excitation force.
  • Q: How is ultrasonic vibrating screen applied to abrasive industry?
    A: Ultrasonic vibrating screen is a new type of vibrating screen, namely ultrasonic vibrating screen, which is improved on the basis of traditional rotary vibrating screen (circular vibrating screen) and launched especially for the characteristics of fine powder, fine powder and other products. In addition to the rotary vibrating screen, one or more sets of ultrasonic systems are additionally installed, roughly including the transducer, power supply and control system. The grid frame is different from the ordinary rotary vibrating screen, and the tension of the fine screen is better. Abrasives are sharp and hard materials, which are used to grind soft material surfaces. Abrasives are divided into natural abrasives and artificial abrasives. According to the hardness classification, it can be divided into two categories: super hard abrasive and ordinary abrasive. Abrasives range from softer household detergents and gem abrasives to the hard material diamond. Abrasive is an indispensable material for manufacturing every kind of precision products. In the abrasive industry, the use of vibrating screen is indispensable, which can be said to be necessary. From rotary vibrating screen, linear screen, flapping screen, small to laboratory inspection screen, to ultrasonic vibrating screen now produced in batch industrialization, it involves various varieties and industries. Among them, silicon carbide fine powder screening, the popular photovoltaic industry in recent years, is used most. Silicon carbide and similar abrasive powder shall be screened before packaging. Generally, it is fine screening to screen out impurities and large particles. The ordinary rotary vibrating screen can only screen the fineness of about 250 mesh, and it cannot be opened even if it is finer. Therefore, the birth of ultrasonic vibrating screen has created conditions for the reprocessing of fine products in the abrasive industry.
  • Q: How to select the appropriate model of ultrasonic vibrating screen?
    A: 1. Before conducting ultrasonic vibration screening, first determine whether your screening purpose is impurity removal or classification, so as to have a preliminary judgment on the number of layers and the range of optional models of ultrasonic vibration screens, because different types of ultrasonic vibration screens can screen different particle sizes. 2. In the process of ultrasonic vibration screening for the purpose of impurity removal, if the particle size range of the material to be screened is wide, the use of double-layer screens as single-layer screens can improve the processing capacity of the screen, protect the lower screen, and extend the service life of the lower screen. At this time, the mesh size of the upper screen should generally be determined according to the particle size characteristics of the material. The size of the upper screen can be considered as the size of the mesh, which is equivalent to 55~65% of the original feed volume. 3. Note that when the content of undersize particles in raw materials exceeds 50%, there are many difficult to screen particles, and there are many sticky mud and high moisture in the materials, the use of double-layer vibrating screens as single-layer screens should be avoided as far as possible. 4. Determine the effective working area of the sieve. The screening area calculated according to the production process requirements is the effective area of the screen, and the size of the screen is the nominal area of the screen. For the vibrating screen used for screening medium sized materials, the effective screening area should be 0.8~0.85 times of the nominal area of the screen. Of course, this is closely related to the opening ratio of the sieve mesh on the screen surface. 5. After the screening area is determined, the width of the screen surface should be at least 2.5~3 times of the size of the block material to prevent the screen from being blocked by the block. 6. Determination of screen hole size: for fine screen and arc screen, when linear vibrating screen is used for fine particle screening, its screen slot size is 2-2.2 times of the separation particle size. Not more than 3 times; For vibrating screen, it is used for screening medium sized materials, and its mesh size is 1.2 times of the separation size; When used for screening coarse materials, the mesh size is only 1.05 of the separation size; For probability sieve, the mesh size is generally 2~2.5 times of the actual separation particle size. 7. The ultrasonic vibrating screen models available are different due to different particle sizes of materials. Generally speaking, heavy vibrating screen is used for materials above 200mm; For materials above 10MM, round motion screen is mostly used; Linear vibrating screen and high-frequency vibrating screen are mostly used for desliming, dewatering and grading. 8. In order to ensure that the ultrasonic vibrating screen can be in good working conditions, the ratio between the length and width of the screen should be selected within the range of 2-3. 9. Reasonable screen surface material and structure suitable for working conditions shall be selected. A reasonable screening structure is very important for the improvement of screening accuracy and efficiency, and the selection of materials has a one-to-one relationship with the industry of screening materials. 10.Environmental protection is now the focus of the state on all enterprises. Therefore, in the process of ultrasonic vibration screening, dust pollution must be avoided, especially the screening of dust and granular powder materials. Dust cover is used to prevent dust from flying in the workshop during screening. During ultrasonic vibration screening, special attention must be paid to its sealing and dust-proof function.
  • Q: What is the difference between ultrasonic vibrating screen and high frequency vibrating screen?
    A: 1、 Different appearance 2、 Different structure The ultrasonic vibrating screen is mainly composed of transducer, ultrasonic power supply, vibration motor, damping spring, dust cover and other parts. The ultrasonic vibrating screen can convert various commonly used low-frequency electric energy into high-frequency electric energy up to 38kHz, and finally obtain a 38kHz mechanical vibration through the ultrasonic transducer, which can not only improve the screening accuracy, but also reduce the blocking phenomenon of materials. The high-frequency vibrating screen is mainly composed of a screen box, an exciter, a motor, a suspension device, etc. the principle of the high-frequency vibrating screen is different from that of the ordinary screening equipment. Because the high-frequency vibrating screen (high-frequency screen) uses a high frequency, on the one hand, it destroys the tension of the pulp surface and the high-speed oscillation of fine particles on the screen surface, accelerates the separation of large-density useful minerals, and increases the probability of contact between materials smaller than the separation particle size and the screen hole. 3、 Applicable materials are different Since the ultrasonic vibrating screen is equipped with an ultrasonic screening system, which is suitable for screening fine powder with viscosity, adsorption and static electricity, and the screening accuracy is within 500 mesh, the ultrasonic vibrating screen still has great advantages in screening fine materials.
  • Q: Why does the ultrasonic vibrating screen sometimes fail to screen?
    A: The technical and economic indicators of the screening process are screening efficiency and productivity. The former is a quality indicator and the latter is a quantitative indicator. There is a certain relationship between them and many other factors, which determine the screening results. The factors affecting the screening process can be divided into three categories: Physical properties of screened materials Including the particle size composition, humidity, mud content and particle shape of the material itself. When the fine particle content of the material is large, the productivity of the sieve is also large. Generally speaking, the screening efficiency will decrease when the humidity of the material is high. However, the larger the mesh size, the smaller the impact of moisture. Therefore, for wet materials with large moisture content, in order to improve the screening process, the method of enlarging the mesh size or wet screening can be adopted. If the mud content of the material is large (when the mud content is greater than 8%), wet screening or pre washing shall be adopted. Influence of screen surface structure parameters The linear vibrating screen makes the particles and the screen surface move vertically, so the screening efficiency is high and the production capacity is large. The relative movement of particles and screen surface is mainly parallel bar screen, plane vibrating screen and cylinder screen, which have low screening efficiency and production capacity. For a certain material, the productivity and screening efficiency of the screen depend on the size of the screen. The productivity depends on the screen width, which is high. The screening efficiency depends on the length of the screen surface, and the long screen surface has high screening efficiency. Generally, the aspect ratio is 2. The larger the effective screen area (i.e. the ratio of the mesh area to the entire screen surface area), the higher the unit area productivity and screening efficiency of the screen surface. The larger the mesh size, the greater the productivity per unit screen surface and the higher the screening efficiency. Influence of production conditions When the load of the screen is large, the screening efficiency is low. To a large extent, the flatness of the circular vibrating screen depends on the size of the mesh and the total screening efficiency; The larger the mesh, the lower the screening efficiency, the higher the productivity. The uniformity of feed is of great significance to the screening process. The inclination angle of the screen shall be appropriate, which is generally determined through tests. In addition, the amplitude and vibration times of the screen are related to the structure and physical properties of the screen. In a certain range, increasing the vibration can improve the screening index.
  • Q: How is ultrasonic vibrating screen applied to abrasive industry?
    A: Ultrasonic vibrating screen is a new type of vibrating screen, namely ultrasonic vibrating screen, which is improved on the basis of traditional rotary vibrating screen (circular vibrating screen) and is specially launched for the characteristics of fine powder, fine powder and other products. In addition to the rotary vibrating screen, one or more sets of ultrasonic systems are additionally installed, including the transducer, power supply and control system. The grid frame is different from the ordinary rotary vibrating screen, and the tension of the fine screen is better. Abrasive is a sharp and hard material, which is used to grind soft material surface. Abrasives are divided into natural abrasives and artificial abrasives. According to the hardness classification, it can be divided into two categories: super hard abrasive and ordinary abrasive. Abrasives range from softer household detergents and gemstone abrasives to hard materials such as diamond. Abrasive is an essential material for manufacturing every kind of precision products. In the abrasive industry, the use of vibrating screen is indispensable, which can be said to be necessary. From the initial rotary vibrating screen, linear screen, flapping screen, small to laboratory inspection screen, and now to the batch industrialized ultrasonic vibrating screen, it involves various varieties and industries. Among them, the most used is the photovoltaic industry of the past few years - silicon carbide fine powder screening. Silicon carbide and similar abrasive powder shall be screened before packaging. Generally, fine screening is used to screen out impurities and large particles. The ordinary rotary vibrating screen can only screen the fineness of about 250 mesh, and it cannot be opened again. Therefore, the ultrasonic vibrating screen The birth of has created conditions for the reprocessing of fine products in the abrasive industry.
  • Q: How to solve the problem that the screening output of vibrating screen becomes smaller?
    A: During the screening process of the ultrasonic vibrating screen, the movement track of the materials on the mesh surface is relatively disordered, either gathering in the middle or dispersing around. Why did this happen? The materials screened by the ultrasonic vibrating screen gather in the middle, which indicates that the force of the vibrating motor becomes small and the materials cannot move. The force of the vibration motor is reduced, which means that the angle of the upper and lower eccentric blocks of the vibration motor is increased. It is OK to reduce the included angle. If the materials are scattered around, it means that the force of the vibration motor is increased, the material movement route is too long, and the force of the vibration motor is increased. It means that the angle of the upper and lower eccentric blocks of the vibration motor is reduced, and the included angle can be adjusted. The screening of ultrasonic vibrating screen is mainly used for screening various loose materials such as powder, granular and small pieces. It is not suitable for screening special materials that are easy to deteriorate, sticky, easy to agglomerate or high temperature, afraid of pressure and corrosive. During the screening process of the ultrasonic vibrating screen, the material movement is disordered. When the vibrating motor is biased fast and does not move, the screen is not tight and loose. There are many grooves on the screen surface. Take down the outer ring and tighten it. When the vibrating motor is biased fast and the screen is tight, the ground of the vibrating screen is uneven, and the ultrasonic vibrating screen can be placed flat. It may also be caused by the unstable mode of material delivery. If the material delivery is stable.
  • Q: What are the characteristics of ultrasonic vibrating screens?
    A: The ultrasonic vibrating screen has high screening accuracy and efficiency, and can be used in powder, granule and mucus. It adopts a fully enclosed structure, the powder does not fly, and the mesh is not blocked. It is an ideal screening equipment. Ultrasonic vibrating screen is a derivative product of rotary vibrating screen. It organically combines the ultrasonic controller with the vibrating screen. On the basis of the traditional rotary vibrating screen, a high-frequency and low amplitude ultrasonic vibration wave is superimposed on the screen. The ultra-fine powder receives a huge ultrasonic acceleration, so that the material on the screen surface is always suspended, so as to suppress adhesion, friction, leveling, wedging and other blocking factors, thus solving the problem of strong adsorption, easy agglomeration, high static electricity, high precision, high density, light specific gravity and other screening problems make the screening of ultra-fine powder no longer difficult, especially suitable for users of high-quality and fine powder.
  • Q: What should be noted when using ultrasonic vibrating screens?
    A: 1: The working input voltage of ultrasonic vibrating screen power supply is AC 220V. 2: If the production requirements can be met, the vibration amplitude shall not exceed 200 Μ M。 3: Do not turn on the power supply of the ultrasonic vibrating screen when the grid is not loaded, that is, the grid is not stretched. Otherwise, it is easy to cause power overcurrent and damage to the grid and transducer. 4: The screen must be tightened, otherwise the ultrasonic output and vibration effect will be affected. 5: The docking screws of the transducer aviation plug must be tightened and wrapped with insulating tape to prevent dust from entering. Pay attention to protect this connector during use. 6: Before the machine starts, check whether the nuts of the transducer and the connecting wire plug are locked and whether the transducer and the grid frame are locked (the locking force is 40 ~ 50kg). In the process of use, pay attention to the protection of HF connecting cable between the chassis and the transducer, pay attention to moisture-proof of HF connecting cable and transducer socket, and do not allow water to enter the connecting plug and socket. If the material is conductive, please use the extended ultrasonic HF connecting cable to isolate the power supply of the ultrasonic vibrating screen from the screening site to prevent the material from entering the power box and causing short circuit. 7: When replacing the screen, the residual glue on the inner ring (resonator) of the grid shall be scraped off with a sharp wallpaper knife. Do not use an angle grinder to grind to prevent damage to the resonator. 8: Each set of ultrasonic system includes an ultrasonic vibrating screen power supply, an HF connecting cable, a transducer and a grid. Do not use the ultrasonic system interchangeably with other manufacturers to avoid unnecessary losses. 9: It is recommended that 504 glue be used for screen pasting. The screen glue shall be as thin as possible and the tension on the screen surface shall be uniform (if necessary, a tensiometer can be used to detect the tension on the screen surface).

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