One trend steadily gaining popularity in material handling operations is the use of moving floor conveying systems to streamline material movement. These systems can be adapted for storing, conveying and feeding nearly any material, thereby providing a flexible solution to complex material handling requirements.
The slats, which are composed of aluminum or formed steel, extend the length of a trailer or bunker floor. Floor slats ride on low-friction bearings that are fastened to a sub-deck. On most systems, both in stationary and mobile applications, the drive unit is mounted beneath the floor for easy access. Slats are attached to the drive unit's cross-drives; hydraulic cylinders move the cross-drives, which in turn move the floor slats. Power to the drive unit is provided by a tractor-mounted power take-off and hydraulic pump, or by a hydraulic power unit.
Because of their design, moving floor systems offer several advantages over conventional systems when conveying bulk materials. For example, they can be constructed to support virtually unlimited tonnage, making them ideal for heavy or dense products. They can also operate at variable speeds, which is important when a regulated flow of material is needed, such as when sending material to a crusher (to avoid overloading the equipment) or when metering products for batch mixing.
Recently, a new system* has been developed that provides plant engineers with the benefits of an efficient, flexible moving floor system in a durable design that can withstand even highly abrasive loads. The system is constructed of formed steel and features V-shaped slats. These slats are designed for high-impact use, and their durability allows them to absorb increased load impact and abrasion. The configurations of each bunker vary, and systems are designed to a plant's specific requirements; however, as with other moving floor systems, dimension and weight restrictions are virtually unlimited.
The system provides a viable solution to a number of bulk handling problems and can boost plant efficiency by increasing throughput and flexibility, reducing downtime, and lowering power requirements.
For reduced dust emissions, roofing can be added. Systems can also be flush mounted, installed above ground, placed in a pit or secured to an existing pad, depending on the plant's material handling needs.
Moving floor systems also provide the flexibility to move several different products with the same conveyor. Unlike a belt conveyor, a moving floor system can handle both light and extremely dense materials; unlike a screw conveyor, a moving floor system can meter products of almost any size-from fine materials to large rocks and boulders. Mobile systems are also available for applications in which material must be loaded or unloaded at various locations.
Stationary moving floor conveyors offer other benefits that many other material handing systems cannot. Since the moving parts on the systems are limited to the hydraulic drive unit, maintenance requirements are low. Additionally, because there are no dangerous pinch points, employees can walk on a moving floor system even while it is in motion. When used properly, moving floor systems are much safer than many other conveying mechanisms.
For plants using front-end loaders to transport their materials to various locations, equipment overload is a common problem. Operators have minimal control over how much material is pushed or dropped onto bulk handling equipment, which leads to costly repairs and downtime. With a moving floor conveyor, variable speed control enables the system to index material to other equipment at a regulated rate.
Efficiently handling heavy, bulky materials is another challenge frequently encountered in ceramic manufacturing plants. One option is to engage a loader for long periods of time to slowly feed a conveyor. Most commonly, however, loaders are used to dump full bucket loads of material onto the conveyor all at once. This often causes undo stress on the conveying system and the trommel, which results in high maintenance costs and lowered productivity.
A moving floor conveyor with V-shaped slats alleviates some of these problems because it is specifically designed to absorb higher impact and abrasion. This feature allows the system to be loaded to capacity and to continuously feed material to a take-away conveyor. Unnecessary wear on the take-away conveyor and other sorting equipment is also reduced because the machinery is supplied with a consistent, but not excessive, flow of material.
*The KEITH® Walking Floor® V-FloorTM system, supplied by KEITH Mfg. Co., Madras, Ore.