Installing one of the three large winders at mine shafts earmarked for large future outputs can be deferred until it is decided to expand the operation. It has been found convenient, in such cases, to construct a concrete headgear designed for the addition of a tower-mounted Koepe winder or a ground-mounted drum winder. A tower-mounted Koepe winder was decided on in the case discussed here. The installation of the winding system coincided with the commissioning of a ton capacity reduction plant. The rock winder could only average 22 hoisting hours per day at an average of 28 trips per hour, the payload of 11,2 tonnes being drawn from three loading positions in the shaft. The men and material winder could only about trips per day, due to the multiple clutching operations needed to serve eight main stations.
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Kope winder or friction winder ppt 1. Historical perspective German Mining Engineer, Friedrich Koepe invented a friction winder in which was later on called as Koepe winder In Hannover mine near Bochum in Ruhr Coalfield of Germany, where Friedrich Koepe was the Technical Director, winding was required to be done from a lower level. To save the cost of power, Koepe attached the cages to an endless haulage rope and dispensed with the winding drum. He further proposed to have the motor on the top of the shaft instead of by the side.
Overview of Koepe Winding System A system where the winding drum is replaced by a large wheel or sheave. Both cages are connected to the same rope, which passes around some degrees of the sheave in a groove of friction material.
The Koepe sheave may be mounted on the ground adjacent to the headgear or in a tower over the shaft. The drive to the rope is the frictional resistance between the rope and the sheave. It requires the use of a balance rope. It is often used for hoisting heavy loads from deep shafts and has the advantage that the large inertia of the ordinary winding drum is avoided.
Schematic figure of a Koepe winder 5. Types of friction winders The friction winders can be categorized as follows: 1. Depending on the location of koepe wheel: a. Ground mounted b. Tower mounted 2. Depending on the number of ropes: a. Single rope b. Multi rope 3. Depending on the location of head sheaves: a. Over and under b. Side by side 7. Multi rope winder 8. Static torque 2. Dynamic torque 3.
Torque required to overcome the friction Static torque is generated because of the out-of-balance load. The dynamic torque is required for acceleration and retardation of masses.
Transmission of power The koepe wheel consists of sections which are connected by means of countersunk bolts. The winding rope which is normally a locked coil rope passes over the lining. Capacity of skip: 12 te b. Mass of skip and suspension gears: 12 te c. Diameter of rope: 29 mm d. Mass of the rope: 4. Angle of lap: o g. Coefficient of friction: 0. Depth of winding: m i. Distance from the top of the skip to friction wheel: 40 m j.
Acceleration time: 14 s k. Constant speed time: 28 s l. Retardation time: 14 s m. Decking period: 13 s n. Diameter of koepe pulley: mm Assume that the rotating inertias are 96 kg-m2. Plot the torque- time and power-time diagram for a friction winder also find the power of the motor for the winder working under the following conditions: 1.
Mass of the loaded skip: 8 te 2. Tare of the skip: 4. Rope mass: 5. Friction wheel dia. Rope speed: 8. Shaft depth: m 7. Tower height: 30 m 8. Bottom rope length: 10 m Acceleration time: 16 s Constant speed time: 30 s Retardation time: 10 s MI of rotating parts: kg-m2 Benefits of Koepe Winder 1.
It is most suitable for winding heavy loads from larger depths. In drum winding the inertia of the system is high owing to the high mass of the drum and multilayer coiling of the rope thereon.
Koepe winder is simple, light in weight and compact and that is why its initial cost is low. We do not require costly foundation etc. The inertia of the system is low. The system demands a low peak power demand from the electric power supply system resulting in a lower operating and maintenance cost and a motor of lower HP is required. Wear and tear of the rope is less as there is no fleet angle.
Multi-rope winding is possible. When the depth of winding increases beyond a certain depth, the drum winding is possible only if the drum is replaced by a large size one. This requires a large size motor also.
However in Koepe winder, you have to change the length of the rope assuming that the motor has sufficient power. The cages do not rest on keps rather they are supported by floating platform at the banking level. This means that shock loading of the rope is not there and kinetic stresses are less. This causes a requirement of a lower FOS. FOS of 6 to 7 is adequate.
Definition of Koepe winder
The basic principle of the KOEPE winder is characterised by the drive of the winding ropes, operating solely by frictional engagement. KOEPE winders may be designed to be floor-mounted at pit bank level surface level of the shaft or as a shaft-head-mounted machine right above the shaft. Koepe winders, unlike drum machines, work with traction sheaves. These sheaves are fitted with friction linings, including rope grooves, on the outer rim. With a usual contact arc of to degrees, the shared ropes for both shaft hoist ways are running in the rope grooves. The conveyances are subsequently moved reciprocally up and down the shaft. The tail ropes attached underneath the conveyances serve to balance out the loads in the shaft hoist ways and form a closed system.
Koepe Friction Winders
In underground mining a hoist or winder  is used to raise and lower conveyances within the mine shaft. Modern hoists are normally powered using electric motors, historically with direct current drives utilizing Ward Leonard control machines and later solid-state converters thyristors , however modern large hoists use alternating current drives that are variable frequency controlled. When using a drum hoist the hoisting cable is wound around the drum when the conveyance is lifted. Single-drum hoists can be used in smaller applications, however double-drum hoists easily allow the hoisting of two conveyances in balance i. Drum hoists require less routine maintenance than a friction hoist, because the haulage cable is fixed to the drum, and therefore have less downtime , and the maintenance regime is less sophisticated. Drum hoists can continue to operate if the shaft bottom gets flooded and less shaft depth is required below the loading pocket, unlike friction hoists where such flooding could cover the tail ropes and so on.