Pulley Hook Block Structure And Disassembly Steps

Pulley hook group is a common lifting equipment in lifting machinery. The hook is often suspended on the wire rope of the lifting mechanism by means of a pulley block and other components. Hook is divided into single hook and double hook according to shape; According to the manufacturing method, it is divided into forging hook and laminated hook.

Single hook is simple to manufacture and easy to use, but the force is not good, most of them are used in the workplace with a lifting weight of less than 80 tons; Double hooks with symmetrical force are often used for large lifting weight. Laminated hook is riveted by several pieces of steel plate cut and formed, the entire hook will not be damaged when the individual plate cracks, safety is better, but the weight is large, mostly used in large weight or lifting steel bucket crane. The hook is often impacted during operation and must be made of high-quality carbon steel with good toughness.

Pulley hook group structure

Pulley hook group is mainly composed of hook, hook beam, thrust bearing, hook nut, pulley, pulley shaft, pull plate and pulley cover and other parts.

Pulley hook group structure, which comprises two choke plates arranged in parallel intervals, the bottom of the choke plate corresponding with a hook mounting hole, hook beam through the hook mounting hole connected to the choke plate, hook beam is installed with a hook and hook nut lock, hook nut between the hook and the hook beam is provided with bearings, the upper part of the choke plate corresponding with a pulley group mounting hole, The block member is connected to the choke plate by shaft through the block mounting hole. Hook group structure not only compact structure, small volume; And the lifting weight is large, high safety and reliability.

Removal steps of pulley hook group

Pulley hook group is a widely used in a small equipment used in the load and support crane, in the semi-closed hook group, under normal circumstances is a small device on the crane for reciprocating travel, but also very easy to damage parts, in the hook group, after a period of operation after the need to be replaced. The order of replacement is as follows:

1. Remove the connecting bolts of the coupling at the end of the hook group.

2. Remove the fastening bolts connecting the Angle bearing box of the hook group to the end beam.

3. Use the lifting screw or jack of the crane to lift the crane bridge, so that the hook tread is about 10mm from the top surface of the track, lever the hook group and pull it out along the track surface in order to unload and replace.

4. Lift the pre-assembled, new active hook group with shaft end gear coupling half body to the crane track.

5. Push the pulley hook group close to the installation position, adjust the jack to slowly lower the car body, insert the fastening bolt, screw on the nut to ensure safety.

6. Properly tighten the horizontal bolts, and then tighten the vertical bolts accordingly. Alternately, pull the wheel when tightening the I, check whether the wheel is flexible, and check the horizontal and vertical deviation of the hook installation.

7. Align the screw holes of the gear coupling half body at the end of the hook shaft and the coupling half body of the driven shaft of the reducer, insert the connecting bolts and tighten them.

8. When everything is normal, drop the car body.

In the use of pulley hook group, in order to ensure the normal operation of the crane, so the active hook at both ends is also to be replaced and maintained at the same time, in order to ensure the consistency of the mechanical transmission gap on both sides, the reducer also needs to be replaced from both sides of the gear coupling.

When purchasing a pulley hook group, the following parameters are usually considered:

Rated weight: The maximum weight that can be safely lifted

Number of pulleys: The number of pulleys in the pulley set affects the lifting force and lifting speed

Wire rope diameter: Diameter of wire rope used for pulley block

Hook width: The maximum width of the hook opening determines the size of the sling or other connector that can be accommodated.

Construction material: Usually made of high-strength alloy steel to ensure strength and durability

Safety factor: The safety margin considered during design and manufacture, usually between 4 and 6, to ensure safety under rated loads.

Hook body rotation capacity: Some hooks can be rotated 360 degrees, increasing operational flexibility and safety.

Body weight: The weight of the entire hook group affects the total lifting capacity and energy efficiency of the crane.

Anti-trip device: the total height from the top of the hook body to the tip of the hook affects the maximum height of the lifting object.

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