Bar grate screening machines : Powerful pre-screening of large rock fragments

The specialized journal GESTEINS PERSPEKTIVEN in its edition 8/2022 on bar screen machines: Before mined rock material can be further processed by crushing machines such as jaw or impact crushers, a preliminary screening is usually required. Bar screen machines are very suitable for this first processing step. They are used for bulk classification, but can also be configured and used for the recovery of usable coarse rock components from waste or for water stone processing.

The Dosiertechnik GmbH...

Vibratory feeders for new ballast plant

For a new ballast plant in Germany, 15 heavy vibratory feeders with feed shoes and integrated needle pushers were needed.

As the material to be conveyed is very wear‐intensive and a conveying capacity of up to 600 tonnes per hour is required, the vibratory conveyors have to be lined with 15mm thick replaceable wear plates made of Hardox.

Feed shoes were required, which are bolted under silos and accommodate the vibratory feeders so that they do not need to be set up or suspended separately. The feed shoes should be equipped with
needle valves so that the silo outlets can be closed off in an emergency. The feed shoes have guide baffles that are also lined with heavy wear plates.

For the vibratory feeders, dosing technology vibration motors were specified for low‐maintenance and trouble‐free operation of the machines.

For feeding the impact crusher, a vibratory feeder in the discharge area is extended from 2200 mm to 2500 mm so that the impact bars of the impact mill are impacted over the entire width.


Vibratory feeder, closed design, swivelling

A mineral grinding mill required a vibrating chute that can be operated in different positions. Our customer's goal was to feed two conveyor belts at different locations with only one vibratory feeder. We solved this demanding task excellently with a manually adjustable slewing ring.

In particular, a very stable slewing ring unit had to be used in the design of the system to withstand the heavy load due to the leverage effects and the vibrations of the machine. The turntable is locked
manually in the respective end position of the vibrating chute. When the second conveyor belt is selected, the turntable is unlocked and the new position of the vibratory feeder is selected. The turntable is then locked again and the vibratory feeder is switched on again. The swivelling capability of vibratory feeders of different sizes and for very different bulk materials is part of a large range of special designs in the Dosiertechnik GmbH programme.


Screening machines and heavy vibratory conveyors

Schwingförderer schwere Ausführung aus Panzerstahl

For the transport of armourstone with grain sizes of up to 1,500 mm edge length, we build special machines with a capacity of 600 ‐ 2,000 t/h. An extremely heavy and stable construction with exchangeable wear plates made of Hardox with a material thickness of 60 mm is required. Due to the high dead weight of the machine of approx. 14,000 kg, the drive with vibration motors is not possible.

Therefore, our Richter exciters with a dead weight of approx. 1,800 kg are used.

For the screening of large grain sizes, we use vibrating bars that can separate or classify grain sizes from 1,000 to 1,500 mm.

We will be happy to help you select the right machines for your needs and provide you with professional and competent advice based on our more than 55 years of experience. Your contact person for questions regarding vibration technology is our managing director Mr. Roland Hambrinker.


Dosiertechnik: a master of productive vibration

The trade journal GESTEINS PERSPEKTIVEN in its 6/2019 issue on dosing technology:

Vibratory feeders are machines that transport conveyed and bulk materials by means of controllable vibration. They are used for clean discharge from silos, for feeding conveyor belts, bucket elevators,
crushers and screening machines of all kinds and much more.
In 1962, Franz‐Josef Hambrinker founded the company in a small warehouse in Greven under the name Dosiertechnik Münster, initially to build dosing chutes for concrete mixing plants. Shortly afterwards, the first vibratory feeders with vibration motors followed, and finally also those with electromagnetic drives.