HRS | Roller Screen

HAZEMAG VARIOwobbler® | HVW 

The HAZEMAG VARIOwobbler HVW brings about a new generation of roller screens. Its distinctive feature is that the gap spacing or setting between the individual shafts can be varied, allowing for the material separation process to take place at the touch of a button. 

Under difficult raw material conditions such as high levels of contamination or a high level of variations within the quarry, the operational variations within the quarry, the operational flexibility of the VARIOwobbler HVW roller screen brings about an unmatched level of benefits.

• Higher Quality Product 
• Reduced Contamination 
• Processing Flexibility 
• Operational Control 
• Increased Product Value 

The VARIOwobbler® HVW roller screen operates with a combination of fixed shafts in the main screening zone and adjustable gap spacing within the VARIO shafts. The VARIO deck is comprised of four (4) shafts, thus permitting a gap variation between three (3) shafts. 

General Operating Specifications / Requirements 

• Maximum Gap = 3 inches 
• Maximum Adjustment Range = 2 inches 
• Gap is solely determined by the distance between the shafts 
• Has some capacity limitations

Design

The HRS roller screen is designed and engineered for reliability, excellent performance, low maintenance, low power consumption, and reduced operating costs. It offers a design and level of technology that is truly unmatched by others, serving cement and aggregate producers around the world. 

Main Frame 

The HRS roller screen offers a very heavy-duty design. The main support frame is a fabricated, welded construction that has external ribbing for added strength. The function of the main frame is to support the bearings, shaft assemblies and the raw material as it is being transported along the roller screen. The main frame box is lined with thick, replaceable wear liners produced from wear resistant HARDOX 450. 

Deck / Modules

The HRS roller screen can be supplied as a single deck, or with multiple decks allowing it to be tailored specific to the application needs and raw material conditions. The decks are supplied as modules, comprised of 4 or 6 shafts. In a typical application where the raw material is clean, such as shot rock limestone, a single deck is normally supplied. In applications where the raw material contains high moisture, sticky materials such as clays, or other adverse conditions, a multi-deck design offers the further benefits of moving the material more aggressively. A multi-deck design also offers the ability to separate the material at different fractions, where each deck can be sized to produce a specific material size. 

Drive System 

The HRS roller screen can be supplied as a single deck, or with multiple decks allowing it to be tailored specific to the application needs and raw material conditions. The decks are supplied as modules, comprised of 4 or 6 shafts. In a typical application where the raw material is clean, such as shot rock limestone, a single deck is normally supplied. In applications where the raw material contains high moisture, sticky materials such as clays, or other adverse conditions, a multi-deck design offers the further benefits of moving the material more aggressively. A multi-deck design also offers the ability to separate the material at different fractions, where each deck can be sized to produce a specific material size. 

Chain Link Drive System

Our exclusive “chain link” drive system ensures the trouble-free operation of the roller screen drive system. Its unique and proven design connects each shaft to its neighboring shaft via a heavy-duty double sprocket. This ensures excellent contact around the radius of each sprocket. The chain link system eliminates the need for chain tensioning and greatly reduces the stress to the drive system. 

Shafts / Bows / Scrapers

The HRS roller screen shafts can be produced as a welded bow design or as a “form fit” design. In the case of the welded design, the bows are welded to the core shaft, producing a very strong system. In the case of the “form fit” design the shafts are fitted with replaceable, wear resistant slide-on sleeves, offering the ability to rebuild the shafts without a core shaft replacement. Unlike competitive wobbler feeders that utilize tubing as shaft material, the HAZEMAG roller screen is designed solely with solids. 

For primary applications the bows are positioned in line with each other. Typical gap spacing ranges from 3 inch up too 4½ inch. 

Form Fit Design – Industry Exclusive 

For increased service life and wear protection, the shafts can be fitted with wear sleeves produced from HARDOX 450 and bows produced from HARDOX 500 material. 

Each shaft is fitted with heavy-duty, adjustable scrapers, which serve the purpose of keeping the shafts clean. 

Application

• Excellent solution for the separation of finer fraction from the feed stream
• Excellent solution for the separation of difficult materials: clays, moisture, etc.
• Form Fit Shaft Protection System: Optional protection system for each shaft which are fitted with replaceable wear sleeves produced from HARDOX 450
• Chain Link System: Each shaft is connected to its neighboring shaft with a heavy duty chain, fully eliminating the need for chain tensioning and reducing the potential for chain breakage