Linear vibrating screen is a new type of vibrating screen machine, widely used in mining, coal, smelting, building materials, refractory materials, light industry, chemical industry, and other industries. The linear vibrating screen can also screen and classify powdery and granular materials, and is widely used in plastics, abrasives, medicine, grain carbon, fertilizer and other industries.
The linear vibrating screen uses the principle of self-synchronized vibration, using a vibration motor as the vibration source, a rubber spring as a shock absorber and a highly wear-resistant material as a sieve plate, and eccentric compression sealing and other advanced technologies. It has advantages of long life, low noise, and high screening efficiency. Apply for sieving ore, natural ore, coke and other powdery materials.
Motor pedestal: Install the vibration motor, the connecting screws must be tightened before use, especially three days before the new sieve machine is tried out. It must be tightened repeatedly to avoid accidents caused by loosening.
Bracket: It consists of four pillars and two-channel steels, supporting the screen box. The pillars must be perpendicular to the ground during installation, and the channel steels under the two pillars should be parallel to each other.
The linear vibrating screen uses vibration motor excitation as the vibration source, so that the material is thrown on the screen and moves forward linearly. The material enters the feed port of the screening machine evenly from the feeder, and several The oversize and undersize products of specifications produced through the multi-layer screen are discharged from their respective outlets. It is more suitable for assembly line operations.
The linear vibrating screen uses the counter weights installed at the upper and lower ends of the motor shaft to convert the rotary motion into horizontal, vertical, and inclined three-dimensional motion, and then transmits this motion to the screen surface. The change of the phase angle of the upper and lower counter weights can change the direction of material travel.
The linear vibrating screen is driven by dual vibration motors. When the two vibration motors are synchronized and counter-rotated, the excitation force generated by the eccentric block cancels each other in the direction parallel to the motor axis, and stacks in the direction perpendicular to the motor axis. As a result, the trajectory of the screen machine is a straight line. The two motor shafts have an inclination angle with respect to the screen surface. Under the combined action of the exciting force and the gravity of the material, the material is thrown up and jumped forward in a linear motion on the screen surface, so as to achieve the purpose of screening and grading the material. It can be used for automatic operation in the assembly line. It has the characteristics of low energy consumption, high efficiency, simple structure, easy maintenance, and no dust spillage in the fully enclosed structure. The sieve mesh number is up to 400 meshes, and 7 kinds of materials with different particle sizes can be sieved.
The SIEBTECHNIK linear-motion screening machine is used to screen and dewater grainy bulk goods. Drive is provided by either double unbalance gear units (type HG, HG-E, UHG), dual-shaft drives (type DWS, DZS, HN) or by unbalance motors (type HR, HR-E, MHR). We build linear-motion screening machines with top- or bottom-mounted drive units for extreme requirements. This applies to wide machines (up to 5.5 m wide) or to extremely grainy feed material (e.g. granite with an edge length of approx. 1.2 m). Also high feed material temperatures and the demand for low residual moisture can be met with these machines.
We manufacture geared screens with one or more decks. Different gear unit sizes enable outstanding setting-up for your specific application. The balance masses and speeds can be adjusted in stages. This enables the linear vibration amplitude and acceleration of the gear box to be optimally adapted to suit the technical process requirements. Our SIEBTECHNIK gear units are fast and easy to fit and offer high screening machine availability. We recommend this drive concept for e.g. crusher load-relief screening, i.e. as a preliminary screen with high feed rates or coarse separating cut.
Dual-shaft screens The drive concept of dual-shaft screens is based on the proven vibration generating system on our circular-motion machines but in a dual version. Two bearing-mounted drive shafts with unbalance masses are driven in opposite directions. The resulting action of the screen box is thus a linear one, as with geared screens. We recommend this drive concept for e.g. the multi-deck screening of hot stone chip material at temperatures of up to 450 C during the manufacture of asphalt and low-pressure dewatering of sand.
Unbalance motors An economical alternative to double unbalance gear units or the dual-shaft solution is a drive provided by two unbalance motors specifically in the area of small nominal widths. Two unbalance motors are driven in opposite directions. The resulting motion of the screen box is therefore linear as on the geared screen or the dual-shaft system. These largely smaller linear-motion screens are used for e.g. the dewatering of sand, gravel, ore, borehole flushing and slag or in recycling.
SIEBTECHNIK linear-motion screening machines are freely vibrating machines, that is, the vibration amplitude freely adjusts itself to suit the mass ratio of screen box and unbalance mass. Linear-motion screening machines are designed with a selectable steep (approx. 75) or shallow (approx. 40) throw angle and are therefore flexible with regard to the selection of the screen panel tilt, which ranges from upwards through horizontal to downwards. Examples are dewatering screens with an upwards tilt of between 3 and 5 and screening machines for classification that require a downwards tilt of up to approx. 40 (thin-layer screening).
Our HG (double unbalance gear units), DWS (dual-shaft screen) and HR (unbalance motors) series screening machines offer separation sizes of between 0.5 and 300 mm and a screen area of approx. 1 to approx. 60 m. These machines can be set up for a vibration amplitude of between 2 and 14 mm, depending on the product. The screen set-up can comprise between one and three screen decks.
The screen box, consisting of side walls and cross-members, can withstand all static and dynamic forces. The vibration generating system is not arranged at the centre of gravity of the screen box. Double unbalance gear units or unbalance motors are mounted on a drive bridge. The important thing is that the resulting force direction runs through the centre of gravity. The same applies to the position of the two drive shafts on dual-shaft screening machines.
The linear-motion screening machine is driven by V-belt drive with intermediate transmission or by a direct drive with a universal joint shaft. Double unbalance gear units have an oil filling. Unbalance motors are grease-lubricated for life. Double shaft screens are optionally oil- or grease-lubricated.
The screen box is elastically supported against the substructure on 4 spring elements. Here different systems of helical compression springs, rubber buffers, vibration elements or air bellows are possible and, if required, combinable (hybrid suspension).
For dusty screened material we supply on request linear-motion screening machines with a dust cover or a closed dust protection box. Individually adapted screening aids in the form of beating devices or spraying systems are also available.
The robust construction using and combining standard component parts ensures high flexibility and customer-focused solutions, on the one hand, and, on the other, enables the construction of machines with low-maintenance running time and a long service life.
To meet especial demand for low residual moisture in e.g. sand, our low-pressure dewatering screening machine is an interesting alternative. It delivers lower residual moisture levels than linear-motion screening machines that are usually used for dewatering. This machine is based on the dual-shaft screening machine drive concept, because with this kind of vibration generation higher speeds can be reached. Higher speeds combined with a pneumatic low-pressure system have a marked lowering effect on residual moisture levels.
For the manufacture of standard asphalt-bound base and surface layers stationary, semi-mobile or mobile asphalt mixing systems are employed. These consist essentially of a dry drum, bucket conveyor, screening machine, aggregate silos, weighing and mixing equipment and a shipment loading system.
The aggregates, which make up about 80 to 90 per cent by weight of the asphalt formulation, are heated to the required temperatures in the burner-heated dry drum. The quality of the asphalt layer depends on, amongst other things, the quality of the binding materials and the correct grain composition of the largest component by volume, the grainy aggregates. For this reason the screening machine is of especial importance
The SIEBTECHNIK TEMA type HN screening machine has the advantage that the drive mounting is positioned outside the fixed dust guard enclosure and so outside the heating zone. Hot chippings at temperatures of up to 450 C have been reliably screened with this system in numerous applications.
The excellent accessibility of the machines in combination with dust guard covers that enable temperatures to be rapidly lowered are an important requirement for short down-times in cases of maintenance or repair. The dust guard available since 2001 in the new, split version with fully extendable chute carrier brings a further improvement on earlier systems here.
There is a comprehensive range of accessories available for all SIEBTECHNIK TEMA screening machines. Whether its a spraying system, wear protection, counter-vibration frame, air suspension, dust guard, dust covers, drive consoles, double unbalance gear units, hybrid suspension or special screen cloths thanks to its decades of experience SIEBTECHNIK TEMA gets you the best result for your requirement
As commonly used screening equipment, the linear vibrating screen has a variety of models and materials. How to choose a suitable linear vibrating screen is also the first consideration for all users. Then Longzhong Heavy Industry Machinery will make a simple for you. I hope that the linear vibration screening technique can help you.
The running track of the linear vibrating screen is a parabolic forward linear motion. The design of the rectangular screen surface makes full use of the screen area of the linear screen, which greatly improves the screening efficiency of the linear vibrating screen. The factors that affect the screen area of the linear vibrating screen are the length and width of the screen. So this also facilitates the selection of different venues. Therefore, when there are restrictions on the worksite, selecting a suitable length and width of the linear vibrating screen can meet the production needs.
The linear vibrating screen is usually used for automated operations on the production line, so the discharge port of the linear vibrating screen can be specially designed for different production lines.
The linear vibrating screen is a commonly used type among various types of vibrating screens, on the one hand, because of its large output and high efficiency, and on the other hand, it has excellent adaptability to various materials. Therefore, different types of linear vibrating screens can be selected for different materials and their production.
2) When the characteristics of the materials are different, the linear vibrating screen should also choose different materials. For example, when sieving the food industry and food-related materials, especially when sieving materials in the pharmaceutical industry, the material of the whole machine must be stainless steel or stainless steel on the surface of the contact material. Only in this way can it be ensured that the materials are clean and hygienic during the screening process and will not cause pollution. But when the material is the raw material of chemical metallurgy and other industries, the part that contacts the material can be made of plain steel, which greatly reduces the production cost of the linear vibrating screen and does not affect the use.
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According to different structure and use, vibrating screens usually be devided into many types by the vibrating screen manufacturers. Below wil introduce the top 10 vibrating screens, and how to choose the right vibratory screen?
linear vibrating screen is driven by double vibrating motors. When the two vibrating motors are rotating synchronously and reversely, the excitation force generated by the eccentric block offsets each other in the direction parallel to the axis of the motor, and overlaps into a resultant force in the direction perpendicular to the axis of the motor, so the motion track of the linear vibrating screen machine is a straight line.
Working Principle:The two motor axes of the linear vibrating screen have an angle of inclination in the vertical direction relative to the screen panel. Under the combined force of the exciting force and the self gravity of the material, the material is thrown on the screen surface to jump or move forward in a straight line. Through the multi-layer screen panels, a variety of specifications of materials are generated, and discharged from their respective outlets, so as to achieve screening and classification. linear vibrating screen is suitable for screening various dry powder or granular materials with particle size of 0.074-5mm, moisture content <7%, and no viscosity. The feed particle size is not more than 10 mm.
Circular vibrating screen is a new type of vibrating screen with multi-layer screen and high efficiency. According to the type of materials and the requirements of users, the high manganese steel woven screen, punched screen plate and rubber screen plate can be used. The circular vibrating screen is installed in the seat type. The adjustment of the screen surface angle can be realized by changing the position and height of the spring support.
Working Principle: The motion track of the screen box of the circular vibrating screen is circular. The circular vibrating screen uses the inertia exciter to produce vibration. The main shaft fixed on the screen box is driven by the motor to rotate at high speed, and the eccentric body installed on the main shaft rotates with it, generating centrifugal inertia force, so that the screen box that can freely vibrate will produce vibration similar to the circular track.
Circular vibrating screen is widely used in the materials classification of mining, building materials, transportation, energy, chemical industry and other industries because of its long flowing line and many screening specifications.
Elliptical vibrating screen is a vibrating screen with elliptical motion track (Elliptical Shale Shaker), which has the advantages of high efficiency, high screening accuracy and wide range of application. Compared with the ordinary sieve machine of the same specification, it has larger processing capacity and higher screening efficiency.
Triaxial elliptical vibrating screen is widely used for the screening operation of sand and stone materials in sand plant. It is the ideal screening equipment for all kinds of mines, quarries and mobile screening stations.
Working Principle: The power is transmitted from the motor to the main shaft of the exciter and the gear vibrator (speed ratio is 1) through the V-belt, so that the three shafts can rotate at the same speed and generate the exciting force. The exciter is connected with the high-strength bolts of the screen box, resulting in elliptical movement.
Materials on the screens do high-speed elliptical movement along with the screen machine, so as to achieve uickly separate, sift and move forward, and ultimately complete the classification of materials.
The working surface of the roller screen is composed of a series of rolling shafts that arranged horizontally, on which there are many screen plates. When working, the fine material passes through the gap between the roller or screen plate, large blocks of materials are driven by rollers, moving to the ends and discharging from the outlets. Roller screens are mostly used in the traditional coal industry.
Working Principle: For the rolling shafts are arranged according to different working angles, the speed of the material is faster when it runs in the position with higher working angle; the speed of the material is slower when it runs in the position with lower working angle.
When two kinds of materials running at different speeds converge at a certain position on the screen surface, they start to move axially, so that the materials are evenly distributed on the screen surface, and the screening efficiency is improved.
Rotary vibrating screen is mainly used for the classification of materials with high screening efficiency and fine screening accuracy. Fully closed structure, no flying powder, no leakage of liquid, no blocking of mesh, automatic discharge, no material storage in the machine, no dead angle of grid structure, increased screen area.
Any particle, powder and mucus can be screened within a certain range. Sieve to 500 mesh or 0.028mm, filter to 5 microns minimum. It can be used for classification, classification and filtration in food, chemical, metal, mining and other industries.
With the help of the heavy hammer installed at the upper and lower ends of the motor shaft, the rotary motion of the motor is transformed into a horizontal, vertical and inclined three-dimensional motion, which is then transmitted to the screen surface to make the material do an outward involute motion on the screen surface. Working Principle: After the rotary screen is started, the eccentric blocks of different phases at the upper and lower ends of the vibrating motor generate a composite inertia force, which forces the vibrating body of the rotary screen machine to rotate again and again, and the screen frame continuously moves to and fro under the action of the vibration force, and then drives the screen surface to vibrate periodically, so that the materials on the screen surface move in a positive and directional manner together with the screen box. Materials smaller than the screen meshes fall to the lower layer, and the materials larger than the screen meshes discharged from the discharge port.
High frequency vibrating screen is also called high frequency screen for short. High frequency vibrating screen (high frequency screen) is composed of exciter, pulp distributor, screen frame, supporting, suspension spring and screen, etc. High frequency vibrating screen is the most important screening machine in mineral processing industry, which is suitable for completely wet or dry raw materials.
Working Principle: Different from ordinary screening equipments, high frequency screen adopts high frequency, which destroys the tension on the pulp surface and makes the fine materials vibrate at high speed on the screen, accelerates the separation of useful minerals with large density (specific gravity), and increases the probability of contact between the materials with smaller than the separated particle size and the screen holes.
As a result, high frequency screen results in a better separation conditions, which makes the materials that smaller than the separation size (especially with larger specific gravity), and pulp pass through the screen holes together to complete the screening. High-frequency vibrating screen is usually operated at an inclined angle 0-25, up to 45, and the operating frequency range is 1500-7200r/m.
Grizzly screen has simple and solid structure, no power consumption, no moving parts, low equipment cost and convenient maintenance, but the productivity is low, the screening efficiency is not high, generally 50% 60%, and the mesh is easy to be blocked.
Working Principle: Generally, the grizzly screen is placed in an inclined position, and the materials are dumped at the high end. Under the action of its own weight, it slides down the screen surface, and the particles smaller than the gap or hole on the screen surface pass through the screen to achieve classification.
Banana screen is mainly suitable for the classification of large and medium-sized materials with high content of fine particles, and it can also be used for dehydration, demineralization and desliming.
Working Principle: During operation, the motor is connected with the vibration exciter through the V-belt or soft connection. The motor drives the eccentric shaft to rotate to generate centrifugal inertia force, which forces the screen box to vibrate. After the materials fall into the screen from the feeding inlet, they move forward rapidly under the action of the vibration force, loosely and pass through the screen.The thickness of the material layer of banana screen from the feeding inlet to the discharging outlet is constant. The ratio of the material quantity to the flow speed on the screen of each section is stable, the material layer is high and uniform. The screening efficiency of banana screen is higher, which is 1-2 times higher than that of other screening machines with the same effective area.
Heavy inclined screen can be applied to the treatment of debris from quarry, mine and building demolition, the treatment of topsoil, the recycling of construction materials, the screening of gravel, and the screening of gravel and aggregates.
Working Principle: The screen box shaft is driven by the motor installed on the auxiliary frame through three V-belts, the auxiliary frame is rigidly connected with the machine underframe, and the screen box spring is used to support the screen box.Inclined screen usually adopts 2-4-layer screen panels, and is fixed on the inclined frame at an angle between 15 and 30. The material can be screened into 3-5 grades at the same time.
Horizontal screen has the advantages of both inclined screen and linear vibrating screen. horizontal screen has the features of good screen permeability, large processing capacity and small installation height.
The installation angle of common vibrating screen is 15-30, while the installation of horizontal screen is parallel to the ground, or slightly inclined 0-5. Horizontal screen is an ideal equipment for all kinds of mines, quarries and mobile screening stations.
Working Principle: Horizontal screen is designed with oval stroke. The advantage of this design is that it can change the oval big diameter length and angle of throwing material stroke to meet the best needs of vibrating screen. The oval stroke is easy to adjust by center gear, counterweight wheel and motor speed.
Different types of vibrating screens can be used for the same material to get different screening effects. The reasonable selection of vibrating screen is an effective way to improve vibration efficiency and maximize economic benefits. Generally, you need to consider the following 5 tips:
When choosing vibratory screen, the material characteristics should be taken into account, including the content of material particles under the screen, the content of difficult screen particles, material moisture, the shape and specific gravity of the material, and the content of clay.
Tips: Heavy vibrating screen is used for materials above 200mm; circular vibrating screen is used for materials above 10mm; linear vibrating screen and high frequency vibrating screen are used for desliming, dewatering and grading.
When selecting the vibratory screen, the screen areas, layer numbers, shape, size and area ratio of the screen holes, as well as the motion mode, vibration frequency and amplitude of the vibrating screen should also be considered.
Tips: In order to keep the screens under good working conditions, the ratio of screen length to width should be in the range of 2-3; when there is much viscous mud and high moisture in the material, double deck screens should be avoided as far as possible.
Vibratory screens need to be selected according to different screening purposes. If it is necessary to pre screen materials, circular vibrating screens are generally used; for the classification and screening of crushed materials, large vibrating screens and probability screens are selected; for the deionization and dehydration of materials, linear vibrating screens are better; if it is necessary to desliminate and clean up materials, probability screens are used.
When selecting the shale shakers, it also needs to be considered according to the processing capacity of the production line, screening method, screening efficiency and the tilt angle of the shale shakers.
Professional vibrating screen manufacturers could provide competitive vibrating screen price, diversity customized vibrating screen models, timely after-sales service, spare parts and can continue to provide services for customers whole production circle.