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ROPE MANAGEMENT SYSTEMS
For braking on steep gradients where normal track brakes have insufficient combined brake force and spring applied caliper brake forces are too severe or where additional braking is required to retard unbraked loaded rolling stock.
The pinch brakes are deactivated during normal running when hydraulic brake pressure is applied to the bogie lift / suspension cylinders, lifting the brake shoes clearly of the rail track.
Pinch brakes are applied when the hydraulic pressure is exhausted to zero, activated by an overspeed trip device or manual dump operation. The bogies unique collapsible and gravity pinch design, allows virtually the full vehicle gross weight to be transferred to the top brake and side brake shoes.
This activates by contact with the rail through the mechanics of the pinch brake design. The top and side brake shoes apply the full car or trains emergency braking capability to the railhead. This system multiplies the available braking force from any vehicle by a factor of two and provides a consistency in braking between full and empty conditions.
All Wheel Sets rollingstock can be offered with a comprehensive range of options on braking systems and operating modes.
Service, emergency and parking brake applications can be provided by using wheel, disc or track braking or any combination thereof.
Track braking is deactivated when hydraulic brake pressure is applied to bogie lift / suspension cylinders, lifting the brake shoes clear of the rail.
Track brakes are applied when the hydraulic pressure is exhausted to zero, activated by an overspeed trip device or manual dump operation.Due to their unique design the bogies collapse allowing virtually the full vehicle gross weight to be transferred to the brake shoes, which on contact with the rail apply the full car or trains emergency braking capability.
This brake type is designed to enhance a track braking system for severe gradients and large payloads. Bogies fitted with the spring applied caliper brake system can either be horizontally mounted for conventional rails or vertically mounted for captivated or semi captivated track systems.
Hydraulic pressure retains the caliper brakes clear of the rail during normal operation ‘Brakes off’ condition. When exhausted to zero, the hydraulic pressure activated by either an overspeed trip device or by manual operation, activates the collapse of the bogie and caliper brake. This allows virtually the full vehicle gross weight to be transferred to the top brake shoe and in a timed action, triggers the spring applied side brake shoes. Through contact with the rail this effectively applies the full emergency braking capability to the railhead. This system enhances the overall available braking force from any vehicle dependent upon the combination of brake spring packs selected, providing a very high efficiency braking system.
Any singular type of emergency brake described or combinations can be applied to materials vehicles, manriding cars or trains to provide a suitable and safe desired braking efficiency and retardation rate. This brake type have been designed to operate on conventional and ATC rails, captivated track and semi captivated track systems.
An axle or bogie of a manriding or materials car can have optional air service brake assemblies fitted to each axle box or wheel support arm, in a singular or multiple arrangement, for locomotive activation.
Simply designed air service brake units acting upon wheel treads or separate brake discs, comprise of a fixed mounted air cylinder and moving piston of varying sizes to provide suitable brake ratio. The pistons can be either simply applied or spring retractable to prevent unnecessary drag and associated brake pad wear.
"Dual mode" braking is achieved utilising a secondary brake track or reaction path that can be added to any hazardous area of a mine’s existing rail system providing highly efficient braking only where necessary on steep gradients. However, on level roadways or less severe gradients where much lower braking forces are required the secondary brake track would be omitted, transforming the brake bogies back to a conventional emergency brake operation.
The secondary braking track also offers the additional benefit of full captivation and guidance on steep gradients where high braking forces are required and overturning moments cause derailment problems.
The "Dual Mode" braking system provides a relatively low cost safe emergency braking system without the need for a full and expensive captivated rail system throughout the mine.
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