Reeving Cable Through the Sheaves on a Main Block

Beeving also determines if the hoist has lateral hook movement or true vertical lift. Spool rope under tension to properly seat the rope on the drum.

How To Set Up A Double Pulley System Block And Tackle Pulleys And Gears Pulley

1 One of the wires or group of wires of any stranded conductor.

. This increases the amount of separation between wire rope parts and may improve the situation by applying stabilizing loads and reducing the amount of rope torque transmitted to the traveling block. To The Top Crane reeving the three sheave block with six parts of line so we can lift a 79000 lb anhydrous ammonia tank. If the hook block rotates 3 full turns turn the rope end 3.

Ropes and reeving systems. Each hoist is driven by an electric motor and operated by a ratchet and pawl lever system. The end of the rope is fed through the outside sheave of the upper block to the outside sheave of the lower traveling block.

The end of the rope is fed through the outside sheave of the upper block to the outside sheave of the lower traveling block. Turn the rope end in the opposite direction to the twisting of the hook block. A typical wire rope reeving system consists of a grooved cable drum two pulleys mounted on a hoist and three more on a main beam so the rope can be reeved into a six-part form supported at a hoist.

2 A unit of wires twisted together to form one of the parts of a. The hauling part has to go through the middle sheave of the upper block or the block will tilt to the side and the falls will jam under load. When the hook block turns 12 turn turn the end of the rope 180.

The length of the boom shall be taken as the straight line distance between the axis of the foot pin and the axis of the boom point sheave pin or where used the axis of the upper load block attachment pin. When reeving through the sheave system avoid kinks or looping which could damage the rope. Straight laced reeving is a basic method of placing the rope through a set of blocks.

If a 3- and 2-sheave block rig is used the method of reeving is almost the same fig. If the skip of a deep shaft mine travels upwards and the rope suddenly stops due to an emergency break the skip will continue to move. The tail should be coming out of the bottom of the pulley.

Now take this strand and pass it down through the sheave on the left pulley that is furthest from you. Figure 6-6-Reeving two 3-sheave blocks. The rope then leads down to the bottom block and passes through the second sheave again the correct sheave is important.

The use of rotation-resistant wire ropes likely will not be required unless the intended length of rope fall exceeds 100 feet or the length of the. Double check to see that the boom main and auxiliary hoist systems are reeved for the specific crane configurations in use. Take the tail and pass it down through the sheave of the left pulley that is closest to you.

Reeving elfects headroom litting speed and capacity by increasing the hoists mechanical advantage. When you thread the fifth sheave it is vital that the rope go down to the last sheave the middle one on. A double pulley system also known as a block and tackle consists of the pulleys or blocks and the tackle the ropes riven through the blocks.

Each individual wire is coated with zinc or galvanized. Reeving blocks to set up a double pulley system requires a little thought. Reeving refers to the configuration of the wire rope blocks and drum of the hoist.

Reeving is then done by passing the wire rope from one side of the block around a sheave to the other side of the block and then around a sheave in the boom top and so. A rope for raising and lowering the load is reeved through sheaves or a block at the boom point. A wire rope reeving system is essentially a rope system in which wire rope travels around drums and sheaves or pulleys for the purpose of hoisting or hauling.

Detach the rope end from the fixed point. Wire rope design criteria. BLOCK REAVING Straight laced reeving is a basic method of placing the rope through a set of blocks.

Restrain the twisting block with a tag line. The three terms used in reeving arc single double and. Wire rope is designed to cope with hostile environments.

It is used in conjunction with an overhead sheave or rope falls to deflect the rope clear of the load especially at or near the top of the lift. In a second aspect a method of reeving the hook block according to first aspect includes a laying a lower portion of a hook block on the ground. Six parts of line give this crane.

You must decide if you will use a double pulley system with one sheave--the roller in a. Keep following the pictures noting that both the sheave and reeving direction is important. This continues to the last sheave.

The sheave spins on an axle or bearing inside the frame of the pulley. The last 40 years. A sheave iːv or pulley wheel is a grooved wheel often used for holding a belt wire rope or rope and incorporated into a pulley.

Allows blocks to run closer together. Sheaves can be used to redirect a cable or rope lift loads and transmit power. Two 3-sheave blocks are the traditional arrangement and the method of reeving is shown in figure 6-6.

Particular care shall be taken in spooling the first layer. Size of wire rope Number of line parts Type of sheave bearing Length of crane boom and Drum Friction. Has no reverse bends.

In deep shaft mines this is a matter of life and death. Wire rope other than rotation resistant rope must comply with either Option 1 or Option 2 of this section as follows. Run the tail up through the sheave on the right pulley that is closest to you.

Wire rope must comply with section 5-171 of ASME B305-2004 incorporated by reference see 19266 except that sections paragraph c must not apply. Becket A wedge socket type wire rope end termination.

Standard Reeve Crane Blocks Ropeblock