Technical description
The hog is intended for horizontal infeed and vertical outfeed. This type of hog can be fed with long material from a vibratory conveyor.
The hog housing consists of welded steel plate lined with bolted wear plates. The exchangeable bottom screen will be adapted to the desired fraction size. The housing is equipped with a hood and hatches for inspection and maintenance.
The hog has a powerful hammermill-type rotor with beaters fitted with turnable cutting edges. Also the disc-shaped rotor sections in between the beaters are equipped with turnable cutting steel. The rotor is journalled in spherical roller bearings with pillow-block bearing housings mounted in brackets welded to the hog housing. The housing also features adjustable anvils.
The main drive consists of an electric motor with V-belt transmission.
For controlled infeed, the hog is equipped with one upper feed roller. The infeed is load-controlled and designed for feeding via a vibratory conveyor. The feed roller is powered by a bevel-gear motor.
The machine also includes a hydraulic unit for balancing the feed roller and opening the hog hood.
A safety system featuring hood lock and limit switches is included in the standard equipment. The rotor shaft is equipped with a standstill monitor. Electrical and control systems are options.
Description of function
The material is fed in horizontally by a vibratory conveyor. The powered feed roller pulls the material inside and controls the feed speed.
Size reduction of the material is done in three steps: First the material is coarsely crushed against a bar located at the top of the infeed before being shredded against the anvils inside the hog housing and finally broken down by the bottom screen, through which the accept size falls down into a chute and a conveyor under the hog.
The feed roller is hydraulically balanced; its pressure on the material can be adjusted on the hydraulic unit. The pressure should initially be set so that the roller is as light as possible without it getting slow on its way down. If necessary, the pressure to the cylinders can be reduced to obtain a more aggressive infeed. The hydraulic unit also includes a choke valve for adjusting the speed of the roller going down. The control program includes a sequence making the roller go up for one second every 30 seconds.
A frequency changer controls the feed roller rpm linearly based on the main motor’s power consumption. The feed roller rpm should be adjusted so that when the hog motor consumes about 80% of the rated current, the roller rpm is reduced linearly so that it stops when power consumption reaches the rated current. When power consumption drops to about 60-70% of the rated current, the infeed is restarted, with a ramping time of 5 seconds.
The hog is equipped with a standstill monitor for the rotor.
A safety lever with limit switch placed ahead of the infeed stops infeed and hog when activated.
The hatches for inspection and maintenance are equipped with an interlocking switch with a key element, while the hood is equipped with a limit switch. The interlocking switch is connected to the standstill monitor so that the hatches cannot be opened until the rotor has come to a dead stop. The hog cannot be started until the limit switch for the hood and the interlocking switch for the hatches are activated.
Efficient, compact and sturdy. Built for years and years of heavy duty.
Different sizes for much more than just bark.
Load-controlled, fines-separating feed rollers.
Hydraulic upper feed roller.
Rotor with heavyduty beaters. Easily exchangeable bottom screen and wear parts.