The new generation of German Graf Equipment GmbH Gorilla pellet mills is especially designed for applications with very hard pelleting conditions in terms of raw material quality in limited working space and while keeping all production norms. The production of wood pellets is one of these applications.
In fact, Gorilla is the first pellet mill designed for the biomass industry, including wood biomass, with direct drive system, without gearbox or V-belts. The new pellet mill performs a high efficiency thanks to its powerful torque motor, saving around 20% of energy, compared with the conventional drive systems.
An unquestionable advantage of all Gorilla pellet mill is their modular design and a large die speed range (from 4 to 8 m/s) without loss of torque, which allows to meet even the highest technological standards of pellet production. Gorilla pellet mills assure superior finished pellet quality with a high PDI (Pellet Durability Index).
The mechanical counterflow cooler for pellet is designed to cool hot pellets by means of a counter-flow stream of cool air which enters the cooler chamber from the bottom through the inlet at the bottom of the device and leaves it through the outlet located at the top of the cooler.
An corresponding layer of material is maintained in the cooling chamber which is fed through an inlet sluice located in the upper part of the cooling chamber. When the maximum filling level in the cooler is reached, the sensor activates the discharge grate, which cyclically discharges the cooled product into the discharge hopper until the rated minimum level is reached. The minimum and maximum fill levels in the cooler chamber is regulated by manually adjusting the position of the fill sensors.
In the lower part of the cooler, there is a discharge mechanism which ensures even removal of material from the cooler chamber.
The CMB series hammer mills manufactured by our company are intended to crush and uniform fractions of dry bulk materials with moisture contents of up to 15% and destined for further technological processes. There is option to grind raw materials with higher moisture content, but this parameter has a very significant impact on the device performance. Depending on needs and purpose, CMB series hammer mills cay operate with capacity from 2 t/h to 10 t/h.
The raw material is crushed by the impact of the hammers on the raw material and the raw material against the walls of the crushing chamber. The regularity and size of the resulting fraction is determined by the diameter of the holes in the screen used. We recommend collecting the crushed material from under the mill with pneumatic transport, as this enables the use of a pneumatic separator to sift out stones and other impurities that may cause explosions. The use of pneumatic transport will also increase the performance of the mill.
Bucket conveyors (elevators) are designed for vertical transport of bulk materials such as pellets, sawdust, wood dust, wood chips etc. They are manufactured in various heights with capacities from 22 m3/h to 238 m3/h. Bucket elevators consist of easy to mount modules, made of steel with Magnelis® coating.
Belt and buckets:
Standard bucket conveyor belts can be used at ambient temperature from -30°C to +50°C. Belts are made of antistatic materials in accordance with ISO284 and DIN22104. Buckets have a very efficient and universal shape that can be used for transporting various materials.
Screw conveyorsare used for transporting sawdust, wood chips, pellets and other bulk materials. Conveyor housing is made of structural steel with Magnelis® coating. Wormwheel is made of thick-walled steel pipe with 10 mm thick spiral welded to the pipe. End necks welded on both ends of the wormwheel are designed to be mounted in high-quality self-aligning ball bearings (SKF or INA/FAG) with UCF housing. Additionally, our screw conveyors are equipped with rotation monitoring sensors and inspection hatches with overflow sensors.Depending on the requirements and purpose belt conveyors could work with capacities from 15 m3/h to 100 m3/h.
Screw conveyors (also known as auger feeders) are used in various industries, and their design can be adapted to the specifics of each industry, if necessary. The screw feeders we manufacture are part of the pellet production lineswe design and build, and ensure stable, even feeding of the raw material to the next production stage.
Belt conveyors(also sometimes called conveyor belts) are widely used in industry (as part of various production lines), logistics (equipment for warehouses and sorting plants), construction, trade, etc.
Belt conveyors are designed for horizontal transport of various bulk materials such as pellets, sawdust, wood dust, wood chips etc. They are used as devices for loading and unloading silos (just like other types of our conveyors such as chain conveyors). Depending on the requirements and purpose, belt conveyors could work with capacities from 25 m3/h to 250 m3/h. Belt conveyors consist of drive section, tension section and intermediate sections. The number of intermediate sections depends on its length. Conveyors are equipped with multi-layer conveyor belt, driven by drive section and moving on rollers. Conveyor housing is made of structural steel with Magnelis® coating. Width of conveyor depends on required capacity.
Redler type chain conveyors are designed for horizontal and inclined (up to 60°) transport of bulk materials such as pellets, sawdust, wood dust, wood chips etc. They are used as devices for loading and unloading silos, hammer mills, pellet mills and simultaneously for combining separate sections of technological lines.
The drive section is equipped as standard with NORD company gear motors, rotation monitoring sensors and inspection hatches with overflow sensors. Drive shaft, on which flywheel is installed, is mounted in high-quality self-aligning ball bearings (SKF or SNR)
Thanks to its construction tensioning section ensures constant optimum chain tension.
Intermediate sections have length of 2000 mm as standard, but if necessary, section with non-standard length can be made. Bottom of conveyor is lined with antistatic, wear-resistant material (polyethylene PE 1000), which ensures low noise level.
Our vibrating screens are designed to sort loose materials into fractions whose size depends on the number of sieves used and the grates size used in the aforementioned sieves. It is easy to operate with a simple design and, thanks to its compact and closed construction, takes up little space in the processing line. Flexible sleeves provide the connections between the screen and the feeding and receiving equipment.Moreover, it is possible to manufacture the screen with a design that prevents dust from entering the machine. The screens have a closed housing made of S235 structural steel. Depending on needs and application, they can offer capacities from 2 t/h to 25 t/h.
Skorpion 350 EB is a stationary drum chipper designed for chipping flat edgings, round timber, various types of furniture and sawmill waste of a width to 350 mm.
The drive section of Skorpion 350 EB chipper is a 37 kW slow-running electric motor. In contrast to high-speed motors, this motor is features more stable operation and higher torque. A slow-speed motor with the same power achieves greater energy transmission, and by increasing the diameter of the pulley on this motor, the service life of the V-belts is extended.
The cutting system of the chipper includes a drum with 2, 3 or optionally 4 cutting knives and 1 counter-knife. Screen used in the construction of this chipper ensures high regularity in size of the product. The required size of chips can be obtained by adequate configuration of suitable number of knives on the drum and the diameter of holes in the screen.
Skorpion 500 EBis a stationary drum chipper designed for chipping flat edgings, round timber, various types of furniture and sawmill waste of a width to 500 mm.
The drive section of Skorpion 500 EB chipper is a45 or 55 kW slow-running electric motor. In contrast to high-speed motors, this motor is features more stable operation and higher torque. A slow-speed motor with the same power achieves greater energy transmission, and by increasing the diameter of the pulley on this motor, the service life of the V-belts is extended.
The cutting system of the chipperincludes a drum with 2, 3 or optionally 4 cutting knives and 1 counter-knife. Screen used in the construction of this chipper ensures high regularity in size of the product. The required size of chips can be obtained by adequate configuration of suitable number of knives on the drum and the diameter of holes in the screen.
The control system of the chipper consists of a control cabinet with functions of switching on, work control