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The anti-bridging system carries out by itself the perfect filling function of the dosing screw, as well as the anti-bridging in the tank.
Some quickly dismantling solutions have been specially studied in order to aid the cleaning of the unit.
The materials have been selected according to the characteristics of the products to be dosed.
Operating principle:
Thanks to a cylindrical tank fitted out with aa anti-bridging device and a mechanical dosing system without air or vibration, you can dose all kind of powdery or granular products.
The flow can be set by varying the speed of the dosing system. The feeding of the dosing system is carried out by the anti-bridging device which at the same time anti-bridges the product in the hopper.
Some examples of treated products:
Flours, cocoa powder, dry fruits, talc, salt, sugar, frozen vegetables, sulphur, metallic oxides, raisins, almonds, pigments, granular products, fibres.
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Milltronics weighfeeders from Siemens can improve the accuracy of processing, blend consistencies, accountability, and record keeping. All weighfeeders come standard with a belt weigh bridge and speed sensor. An integrator is required to complete the system.
The weighfeeder is used to deliver an accurate mass flow rate of material. In the majority of applications, material is profiled by an adjustable mechanical shear gate, which fixes the correct material bed depth for a given particle size.
The feed rate is then maintained and adjusted by varying the speed of the belt. However, in some cases the belt speed is constant with rate control (if any) done by a pre-feeding device.
The system consists of three components: weight and speed sensing, integration and control, and the mechanical conveying system.
Using the belt load and the belt speed signals, small incremental totals of weight per time are measured by the integrator and then the flow rate is calculated. The measured flowrate is compared against the desired flowrate and the on-board PID controller makes necessary corrections to the belt speed.
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MULTIDOS weighfeeders are complete weighing systems with extensive variants to adapt to different feed rates, bulk solids properties, and application-specific marginal conditions.
- feed rates: up to approx. 1000 t/h
- main fields of use:cement, steel, and minerals industries
- for granular bulk solids (clinker, gypsum, lump coal)
- for powdery and mealy bulk solids (raw meal, fly ash, filter dust)
- for difficult to handle/sticky bulk solids (clay, marl, gypsum from flue gas desulfurization)
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These machines are suitable to dose in continuous powder, granular and fibre materials. They are particularly suitable for fluid materials and can reach feed rates up to several tons per hour.
As belt feeders can be installed directly under a silo or pre-storage hoppers, while as weighing belts can be re-filled in continuous from other extractor machines such as screws, stellar valves other belts. These machines are equipped with a weighing bridge with loading cells and they can be also equipped with different control devices suitable to satisfy the most various dosing and weighing needs, both in continuous and batch.
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Sandvik RBF-series belt feeders can be assembled in various ways to match the application exactly due to their modular structure . Available with ten belt widths from 650-2400 mm and in lengths from 1.5-15 m, they are designed for applications with capacities up to 2600 m3/h. The RBF-series belt feeders suit for materials that have at least moderate internal cutting properties such as coal, lime, Fe-pellets, metal concentrates and different rocky materials.
Sandvik RBF-series belt feeders have wide and adjustable capacity range while they are reliable, silent, steady and have low raise of dust. Due to the adjustable and controllable output the RBF-series belt feeder can be used in applications where accurate feeding is needed.
Sandvik RBF-series belt feeders are easy to assemble, install and operate. With a wide range of standard modules and components they can be tailored exactly to meet the application requirements. At the same time, they are versatile, easy to adapt and easy to service.
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Thermo Electron Corporation's Ramsey weighbelt feeders are designed for demanding industrial applications and provide accurate monitoring and control.
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Weight Indicator TAD 3 is intended for converting signals from strain gauge based load cells and force transducers into suitable indication or for PC or PLC based systems. As options, flow measurement and recipe controlled batching facilities are available. The high accuracy and very fast transmission rates make TAD 3 perfectly suited to advanced process control. TAD 3 is panel mounted.
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Weight Indicator TAD 3 is intended for converting signals from strain gauge based load cells and force transducers into suitable indication or for PC or PLC based systems. As options, flow measurement and recipe controlled batching facilities are available. The high accuracy and very fast transmission rates make TAD 3 perfectly suited to advanced process control. TAD 3 is panel mounted.
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| ... products without technical information |
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