Analysis on the problem of material deviation during the use of linear vibrating screen:　　The use of linear vibrating screens is becoming increasingly common due to their widespread application in various industries, and the problem of material deviation has been a long-standing issue. The following is a summary of the reasons for material deviation in linear vibrating screens.　　1. Installation issues with vibration motors　　Due to the fact that the transportation and screening of materials by the linear vibrating screen is carried out through the vibration source body - the vibration motor - which provides a designed fixed direction and fixed size of excitation force to push the material. Therefore, when there is poor material transportation, it can be basically judged that there is a problem with the installation angle of the vibration motor.　　2. Not feeding evenly as required　　If you have read the manual of the linear vibrating screen in detail, you should know that the repeated requirement is: uniform feeding. If there are fluctuations in the amount of material fed, it is easy to cause unstable screening accuracy, and the deviation of material stress due to the amount of material can lead to the problem of discharge deviation.　　3. Aging and loosening of components　　In addition to the vibration motor providing the main screening power for the linear vibrating screen, the damping springs in the linear vibrating screen also affect the screen force and the horizontal stability of the screen body to some extent. As the saying goes, one pull can move the whole body. If a component experiences aging or other issues, it can cause the discharge direction to deviate due to uneven screening surfaces, unstable screening machines, etc. In severe cases, there may even be sudden abnormal noise, severe wear of vibrating screens, and reduced lifespan. Therefore, it is very necessary to regularly inspect and maintain the equipment, and the materials used for the components are also crucial.　　4. Screen box deformation　　The sieve box refers to the part above the vibration motor and below the feeding port, consisting of a sieve frame and the sieve surface fixed around it. Under normal operation of the linear vibrating screen, especially for large and high-frequency linear vibrating screens, the screen frame requires both the gravity of a large batch of screened materials and the strong excitation force of the vibration motor. If the strength is not sufficient, it is easy to cause deformation, damage, and other problems. The strength of the screening box mainly depends on the manufacturer's material selection, welding process, and additional stable design.　　In summary, the operation of a linear vibrating screen is related to many aspects, including the manufacturer's material selection quality, manufacturing process, and whether the customer's installation, operation, and maintenance are standardized. When there is a problem of material deviation, customers can eliminate the problem one by one based on the above factors and find corresponding solutions.

　　Classification of vibrating screens:　　Vibration screening equipment can be divided into mining vibrating screens, lightweight fine vibrating screens, and experimental vibrating screens according to their weight and usage.　　Mining vibrating screens can be divided into: high-efficiency heavy-duty screens, self centering vibrating screens, elliptical vibrating screens, dewatering screens, circular vibrating screens, banana screens, linear vibrating screens, etc.　　Lightweight fine vibrating screens can be divided into: rotary vibrating screen, linear screen, straight row screen, ultrasonic vibrating screen, filter screen, etc. You can refer to the vibrating screen series.　　Experimental vibrating screen: please refer to the experimental equipment for tapping screen, top impact vibrating screen machine, standard inspection screen, electric vibrating screen machine, etc.　　According to the material running trajectory of the vibrating screen, it can be divided into:　　Divided by linear motion trajectory: Linear vibrating screen (material moves forward in a straight line on the screen surface).　　Divided by circular motion trajectory: circular vibrating screen (material moves in a circular motion on the screen surface) structure and advantages.　　Divided by reciprocating motion trajectory: fine screening machine (material moves forward in a reciprocating motion on the screen surface).　　Vibration screens are mainly divided into linear vibration screens, circular vibration screens, and high-frequency vibration screens. The vibrating screen can be divided into single axis vibrating screen and double axis vibrating screen according to the type of vibrator. A single axis vibrating screen uses a single unbalanced weight to excite the screen box, causing the screen surface to tilt and the motion trajectory of the screen box to be generally circular or elliptical. Double axis vibrating screen is a type of screen that utilizes synchronous and opposite rotation of unbalanced weights to excite vibration. The screen surface is horizontal or gently inclined, and the motion trajectory of the screen box is a straight line. There are various types of vibrating screens, including inertial vibrating screens, eccentric vibrating screens, self centering vibrating screens, and electromagnetic vibrating screens.　　Linear vibrating screen:　　Vibration screen is a widely used screening machinery in industries such as coal, used for material classification, washing, dehydration, and media removal. Among them, the linear vibrating screen has been widely used due to its high production efficiency, good grading effect, and convenient maintenance. During the working process, the dynamic performance of the vibrating screen directly affects the screening efficiency and service life. The vibrating screen uses a vibration motor to excite the material as a vibration source, causing it to be thrown up on the screen while moving forward in a straight line. The material is evenly fed from the feeder into the feed inlet of the screening machine, and through multiple layers of screens, several specifications of sieved and undersized materials are produced, which are discharged from their respective outlets. Linear vibrating screen (linear screen) has the advantages of stability, reliability, low consumption, low noise, long service life, stable vibration mode, and high screening efficiency. It is an efficient and new type of screening equipment widely used in industries such as mining, coal, smelting, building materials, refractory materials, light industry, and chemical industry.　　Circular vibrating screen:　　Circular vibrating screen (circular vibrating screen) performs circular motion and is a multi-layer, high-efficiency new type of vibrating screen. The circular vibrating screen adopts a cylindrical eccentric shaft exciter and a bias block to adjust the amplitude. The material screening line is long, and there are multiple screening specifications. It has the characteristics of reliable structure, strong excitation force, high screening efficiency, low vibration noise, durability, easy maintenance, and safe use. The circular vibrating screen is widely used in product grading in industries such as mining, building materials, transportation, energy, and chemical industry. According to the material product and user requirements, high manganese steel woven screen, punched screen, and rubber screen can be used. There are two types of screen: single-layer and double-layer, and each type of screen can meet different screening requirements. This series of circular vibrating screens is seat mounted. The adjustment of the inclination angle of the screen surface can be achieved by changing the position and height of the spring support.　　Elliptical sieve:　　Elliptical sieve refers to a vibrating screen that follows an elliptical motion trajectory, which has the advantages of high efficiency, high screening accuracy, and wide applicability. Compared with ordinary screening machines of the same specifications, it has a larger processing capacity and higher screening efficiency. Suitable for solvent and cold sintered ore screening in the metallurgical industry, ore grading in the mining industry, and grading, dewatering, and desliming operations in the coal industry. It is an ideal substitute for existing large vibrating screens and imported products from abroad. TES three-axis elliptical vibrating screen is widely used for screening operations in quarries and sand and gravel materials, and can also be used for product grading in coal selection, mineral processing, building materials, construction, and power chemical industries.　　Screening principle: Power is transmitted from the motor to the active shaft of the exciter and the gear vibrator (with a speed ratio of 1) through a V-belt, achieving three shafts rotating at the same speed to generate excitation force. The exciter is connected to the high-strength bolts of the screen box, producing elliptical motion. The material moves along with the high-speed elliptical motion of the screening machine on the screen surface, quickly layering, sieving, and moving forward, ultimately completing the classification of the material.　　The obvious advantages of three-axis elliptical sieve:　　The three-axis drive can generate ideal elliptical motion in the screening machine, which combines the advantages of circular vibrating screen and linear vibrating screen. The elliptical trajectory and amplitude can be adjusted, and the vibration trajectory can be selected according to the actual material condition, which is more advantageous for difficult to screen materials;　　Three axis drive forced synchronous excitation can enable the screening machine to obtain a stable working state, which is particularly advantageous for screening with large processing capacity requirements;　　The three-axis drive improves the stress state of the screen frame, reduces the load on a single bearing, evenly distributes the force on the side plate, reduces stress concentration points, improves the stress conditions of the screen frame, enhances the reliability and lifespan of the screen machine, and lays a theoretical foundation for the large-scale development of the screen machine.　　Due to its horizontal installation, the height of the unit is effectively reduced, which can well meet the needs of large and medium-sized mobile screening units. Thin oil lubrication of bearings effectively reduces bearing temperature and improves service life; With the same screening area, the yield of elliptical vibrating screen can be increased by 1.3-2 times.　　Thin oil vibrating screen:　　The thin oil vibrating screen has a large processing capacity and high screening efficiency; The vibrator adopts a bearing lubrication with thin oil and an external block eccentric structure. Has the characteristics of high excitation force, low bearing load, low temperature, and low noise (bearing temperature rise less than 35 ° C); The vibrator is easy to disassemble, maintain, and replace as a whole, greatly reducing the maintenance cycle (replacing the vibrator only takes 1-2 hours); The side plate of the screening machine adopts whole plate cold work, no welding, high strength and long service life. The connection between the crossbeam and the side plate is made with high-strength bolts that resist torsion and shear, without welding, and the crossbeam is easy to replace; The screening machine adopts rubber spring vibration reduction, which has the advantages of low noise, long service life, smooth passing through the common vibration zone, and low dynamic load on each fulcrum of the screening machine compared to metal springs; The connection between the motor and the exciter adopts a flexible coupling, which has the advantages of long service life and low impact on the motor.　　This screening machine series is widely used for grading operations in industries such as coal, metallurgy, hydropower, mining, building materials, chemical, power, transportation, and ports.

　　Rotary vibrating screen is the most widely used in the vibrating screen family, because of its shape characteristics and the characteristics of screening materials, it is also called a round vibrating screen or a round screen powder machine. Its applicable materials are very wide, and liquids, granules, and powders can be sieved. It is precisely the liberalization of customization and high penetration that has created a high market share of rotary vibrating screens. Then, the precautions for the start-up operation of the rotary vibrating screen have become the things that the rotary vibrating screen manufacturers need to synchronize and popularize, so that users can use it better. The precautions before turning on the rotary vibrating screen will be popularized today.　　1. Remove the transportation support frame:　　In order to avoid damage to the shaker equipment during transportation, the rotary vibrating screen manufacturer will install three support frames made of flat steel before leaving the factory. The user requires that the support frame must be removed before the first startup. Otherwise, the rotary vibrating screen cannot operate normally, and there are signs to indicate the installation position of the support frame, and the general position is near the vibration spring.　　2. Check the tightening of the accessories of the rotary vibrating screen:　　Before using the equipment, carefully check the firmness of the vibration motor, locking ring, shock-absorbing spring and other components; check the fasteners of the vibrating screen, the bolts of the whole machine are tightened in place before leaving the factory, but the user is required After using for a period of time, the bolts of the whole machine are required to be tightened again, and the bolts will loosen under the condition of stress relief. If any looseness is found, it should be tightened in time.　　3. Fixed corner:　　Since the vibrating screen is a screening purpose achieved by vibrating motor, high-frequency vibration will be generated during screening, and the phenomenon of the overall movement of the screen machine will be generated. Therefore, the bottom barrel needs to be fixed at the corner when it is used for the first time, which can effectively protect the equipment and Improve screening efficiency.　　4. Screen tightness:　　The tightness of the screen of the rotary vibrating screen is generally installed in place before leaving the factory, but the equipment made by some small manufacturers is difficult to say. The user should pay attention to the tightness of the screen when using the rotary vibrating screen for the first time, the screen is too loose Material penetration rate will drop.　　5. Check the running direction of vertical vibration motor:　　Vertical vibration motor is the vibration source of the rotary vibrating screen equipment. The rotation direction of the vibration motor has a certain influence on the screening performance. The direction of the vibration motor normally rotates clockwise. In addition, users can flexibly adjust the angle of the eccentric block of the vibration motor and change the material screening method. The user should adjust the eccentric block to the appropriate position according to the different moisture content, viscosity and specific gravity of the material.　　6. After the feeding is completed, let the round sieve powder machine continue to run for about 5 minutes, so that the screen and bottom materials are completely discharged to avoid the residual materials from getting wet, the next screening effect of the sound, or due to the replacement of materials and mesh The problem of mixing.

　　1. Regularly check the tension and flatness of the screen. When replacing the screen, it must be replaced in strict accordance with the requirements of the linear vibrating screen manufacturer. There must be more than 2 people to cooperate. One person is responsible for tensioning the screen and the other is responsible for fastening. Screen. It is worthwhile to pay attention to the uniform and quantitative scientific feeding method when feeding, which can effectively avoid the sieving surface loosening and damage caused by the uneven thickness of the material stacked on the sieve surface.　　2. The installation of the screen box is generally the responsibility of the shaker manufacturer. If there is a phenomenon of non-feeding caused by the level of the screen box, please contact the manufacturer immediately to ask for after-sales service, and please have a specialized technician come to the scene to carry out the horizontal exposure Adjustment of the horizontal plane.　　3. The maintenance of the vibration motor's excitation force needs to be performed on a regular basis for lubrication and maintenance. If the vibration motor's excitation force needs to be adjusted due to material replacement or output changes, it can increase the allocation of the eccentric weights above and below the vibration motor. Number of chunks.　　The upper hammer mainly generates horizontal excitation force, thereby allowing the material to move horizontally on the screen surface, and completes the process of the material diffusing outward from the middle. At the same time, the magnitude of the horizontal vibration amplitude determines the speed of the material movement; This can be achieved by increasing the weight of the upper eccentric weight. As the weight increases, the vibration amplitude increases, otherwise it decreases.　　In order to better achieve better screening efficiency, you need to combine with the manufacturer to make a suitable adjustment plan according to the material characteristics.　　4. If the original shaker spring equipped with aging needs to be replaced, it is recommended to choose a support spring with a certain toughness as the support of the linear vibration screening machine to avoid damage to the support spring due to excessive rigidity. If it is not clear, you can directly contact your equipment manufacturer and ask them to equip them with another damping spring of the same model.　　In a word, in the actual production screening process, the efficiency of the linear vibrating screen is a dynamic balance maintenance issue. Any unreasonable component or link may cause the vibrating screen to appear similar to "no feed, no feed". Such as the problems that affect the screening accuracy and screening efficiency, what we have to do at this time is to calm down, find the real cause of damage and optimize and adjust it. It is also a good choice to seek professional help from the shaker manufacturer.

　　Linear vibrating screen is one of the main equipment in the crushing and screening process, and also the key equipment for providing qualified materials for subsequent operation. Its screening efficiency directly affects the subsequent operation. In the actual plant, the main factors affecting the screening efficiency of linear vibrating screen include material properties, screen surface structure parameters, vibration characteristics parameters and so on. Below, we will analyze how the above aspects affect the screening effect of linear vibrating screen.　　　First、 Material properties　　The properties of the selected materials are one of the main factors affecting the screening efficiency of the linear vibrating screen, and the material properties are mainly reflected in the loose density, particle size and shape of the materials.　　1. Loose density of selected materials　　Generally, the loose density of materials is large and block particles, easy to pass through the screen, and the screening efficiency is high. On the contrary, the loose density of materials is small and the powder materials are not easy to pass through the screen, and they are easy to stay on the screen, which will limit or block the screen, so that the effective screening area of the sieve will be reduced, and the screening efficiency will be affected. In order to ensure the screening efficiency, the loose density of the selected materials should be controlled.　　2. Selected material size　　The particle size of selected materials is also an important factor affecting the screening efficiency of linear vibrating screen. The size of the particles of the materials entering the screen shall meet the size of the sieve hole. The size of the particles is small and easy to pass through the screen, and the size of the materials is not easy to pass through the screen. In order to ensure the screening efficiency, the particle size of the materials entering the screen shall be strictly controlled.　　3. Shape of materials in sieve　　The shape of the materials into the screen will affect the sieve property. Generally, the particles are full of grinding and the mineral particles with specifications are easy to pass through the screen. The irregular shape of the particles, such as long strip and sheet shape, is poor in screening rate. Therefore, it is necessary to ensure that the particle shape of the crushed material conforms to the sieve standard.　　Second、 Screen surface structural parameters　　The structural parameters of the linear vibrating screen are mainly reflected in the length and width of the screen surface and the size and shape of the screen.　　1. Screen length and width　　The length of screen surface of linear vibrating screen mainly affects the screening efficiency and the screen width affects productivity. The screen surface of straight screen is longer, the material stays on the screen surface for a long time, and the screening opportunity is more, which will improve the screening efficiency. In fact, the width of screen surface has different influence on screening efficiency and screen length on screening capacity.　　The relationship between screening efficiency and the time of material on the whole screen is that at the beginning, the screening probability is higher. Because there are many fine-grained materials on the screen surface at the beginning, the screening probability is larger in unit time. After a certain time, the particle size of the materials left on the screen surface is mostly hard to screen materials close to the size of the screen. Even if the material stays on the screen surface for a long time (i.e. the length of the screen surface is large), it is difficult to increase the screening probability of the material, which leads to the decrease of the screen machine working efficiency. Therefore, the selection of the appropriate screen surface length can effectively improve the screening efficiency, and the ratio of the length to width of the straight screen surface is 1:2-1:3.　　2. Shape and size of sieve　　The selection of the shape of the sieve of the linear vibrating screen mainly depends on the screening granularity of the materials entering the screen and the product use under the screen. Compared with other shaped screens, the size of the materials passing through the circular sieve is smaller and the size of the materials passing through the rectangular sieve is larger. Therefore, in order to obtain higher screening efficiency, the different screening materials should be selected Same shape of sieve.　　Third、 Vibration characteristic parameters　　The vibration characteristic parameters of the linear vibrating screen include the inclination angle of screen surface, the direction angle of vibration, the amplitude and the vibration frequency.　　　1. Screen inclination　　The inclination of the screen surface of the linear vibrating screen is related to the equipment processing capacity and screening efficiency. When the screen face inclination increases, the throwing strength of the material on the screen will increase, the material movement speed on the screen surface will increase, and the processing capacity of the vibrating screen will be increased. However, the retention time of the material on the screen is shorter, the material passing through the screen is less, and the screening efficiency is reduced. Otherwise, the processing capacity will be reduced and the screening will be reduced Efficiency is high.　　In order to control the screening efficiency of the vibrating screen in a relatively ideal range, the inclination angle of the screen surface of the general linear vibrating screen is between 0 and 8 °.　　2. Vibration direction angle　　The angle between the vibration direction and the upper screen surface is called the vibration direction angle. The larger the vibration direction angle, the shorter the distance of mineral particles moving in each throwing movement, the slower the speed of moving on the screen surface, the more adequate the screening of materials, so the screening efficiency is higher. The smaller the vibration direction angle, the longer the distance of material moving forward on the screen surface when throwing, the shorter the time passing through the screen surface, the material can not be fully screened, so the screening efficiency is low. In order to ensure the screening efficiency of the linear vibrating screen, the range of the vibration direction angle is 30-60 ° is appropriate.　　3. Amplitude　　The amplitude of the linear vibrating screen determines the energy of the material particles moving on the screen surface. The larger the amplitude, the greater the amplitude of the material moving in the direction of the vertical screen surface during the screening process, the less the blockage of the screen, the more favorable the screening, the better the screening efficiency; otherwise, the screening efficiency is poor. Generally, the selection of amplitude is determined by the size and properties of the materials entering the screen. For materials with larger particle size, it is suitable to choose linear sieve with larger amplitude and lower frequency; for materials with smaller particle size, it is easy to select linear screen with smaller amplitude and higher frequency.　　　4. Vibration frequency　　The vibration frequency of the screen surface of linear vibrating screen mainly affects the movement state of mineral particles, and the low or too high frequency is not conducive to the material passing through the sieve. The vibration frequency is too low, the probability of movement of mineral particles in the direction of vertical screen surface is small, and the screening rate is low; the vibration frequency is too high, and the vibration of mineral particles is easy to be confused, which affects the screening efficiency. Generally, the range of vibration frequency of the screen surface of the linear vibrating screen should be controlled within 15hz-30hz.　　The above is the influence of the linear vibration screen screening efficiency of several aspects, if you want to effectively improve the screening efficiency of the linear vibrating screen, these aspects can not be ignored!　　In the actual plant, each mineral has its own mineral characteristics, and has differences in density, hardness, gangue content, etc. Therefore, when selecting equipment, mineral processing test should be carried out first, and the suitable linear vibrating screen shall be selected through the test results, so as to ensure that all parameters of the equipment conform to the mineral particles.