APRON FEEDER HAF
APRON FEEDER HAF
|Machine*||Width [mm]||Chain type|
|HAF 18xxx||1.800||D5 / D7|
|HAF 20xxx||2.000||D4 / D7|
|HAF 25xxx||2.500||D8 / D9|
|*Available in different lengths|
HAZEMAG’s HAF Apron Feeders are used for feed hopper discharging in primary crushing plants, and as a loading or discharging conveyor in, for example, the cement and raw material industry. HAZEMAG Apron Feeders provide capacities of up to 4,000 t/h with piece sizes up to 3m3.
When selecting a suitable hopper discharge unit, it is very important to ensure that material is conveyed to the downstream machine at a variable conveying speed, under varying load conditions.
The hopper geometry must match the hopper discharge unit, and the hopper discharge unit, in turn, has to match the downstream unit.
Since 1981, more than 178 HAZEMAG Apron Feeders have been put into operation world-wide.
The Apron Feeder assembly consists of heavy-duty conveyor chains, on which the apron pans are mounted. The chains run on support rollers that are mounted to the Apron Feeder frame. They are driven by chain sprockets and tensioned either mechanically or hydraulically, depending on the Apron Feeder size
Apron Feeders have also been proven to be a reliable hopper discharge system for sticky materials.
The framework consists of right- and left-hand beams, of sectional steel to meet stability and rigidity requirements, which are connected by welded crossbeams. On the crossbeams are the beams and slide rails for supporting and guiding the tractor chain. Pre-assembled units are joined together to form the required length, and they are designed so that a skirting can be bolted onto the outer sides of the frame, with no need for a separate support, and with no relative movement between the skirting and Apron Feeder.
The conveyor chains are heavy, tractor-type chains, with lifetime-lubricated links, which run on support rollers that are mounted to the Apron Feeder frame. They are driven by chain sprockets and tensioned either mechanically or hydraulically, depending on the Apron Feeder size.
Apron Feeder Pan
An Apron Feeder Pan is bolted to each link of the tractor chain, and every second plate is equipped with a carrier that transports the material. The specific contour of the apron pans ensures that only a very small amount of material finds its way to the inside of the Apron Feeder.
Along the length of the conveyor, slide rails are mounted under the Apron Feeder pans; additional lubrication is not necessary. Furthermore, additional slide rails are installed in the feed area to absorb shock loads.
The Apron Feeder is driven either electro-mechanically or hydraulically. The conveying speed is infinitely adjustable; a back stop prevents the feeder from moving backwards. The gear temperature is monitored by PT100.
The operation of the Apron Feeder is continuously monitored by a rotation detector at the tail shaft.
The protection guards consist of easy-to-remove protective covers that are mounted on the Apron Feeder frame as safety guards. The moving parts of the drive unit are protected from unauthorised intervention.
The drive shaft and tail rotor shaft are fitted with replaceable gear rim segments. Sprocket segments enable replacement without removing or splitting the chain.
The sidewalls serve as the skirtings, and are located above the Apron Feeder, between the feed hopper and Apron Feeder discharge. A special feed hopper design, along with the movement of the material, results in a specific layer thickness. The skirtings of the Apron Feeder are designed according to the predicted layer height.
Since the material on the Apron Feeder is conveyed by the moving pans and chains, there is no relative movement between the material and the apron pans, which results in low-wear operation.
The support rollers are bolted to the frame’s upper side and are lifetime-lubricated. The tractor chain moves on these rollers. In the hopper infeed area, support rollers are mounted on shock-absorbers to reduce the impact of loads on the Apron Feeder construction during tipping. The lifetime-lubricated return rollers carry the outside edge of the Apron Feeder pans on the lower side of the frame.
Mounted directly under the Apron Feeder, the Spillage Conveyor HCC is a chain conveyor used to collect any remnants of conveyed material which, having adhered to the Apron Feeder pans, drops off on the return side. The Apron Feeder and the Spillage Conveyor work in tandem, but are operated independently.
Spillage Conveyor comprises:
- Drive shaft assembly with two cast sprockets and pillow block bearings.
- Power transmission via geared motor.
- Two sets of round link steel chain with scraper bars bolted at equal intervals.
- Take-up shaft assembly with two cast sprockets and pillow block bearings.
- Pre-tensioning of chains by tension spindles with springs.
- The space between drive and tension shaft assembly is connected by bolted flanges.
The operation of the Spillage Conveyor is continuously monitored by a rotation detector at the tail shaft.