Precautions when using two hand chain hoists together

Precautions when using two hand Chain Hoists together

Introduction
As a lifting equipment widely used in the industrial field, hand chain hoists are favored by users all over the world for their easy operation, convenient carrying and simple maintenance. The demand for hand chain hoists is also growing among international wholesale buyers. However, when two hand chain hoists are needed to complete a lifting task together, the complexity of operation and potential safety risks also increase. Therefore, understanding and mastering the precautions when two hand chain hoists are used together is crucial to ensure operation safety and improve work efficiency.

I. Preparation before use
(I) Equipment inspection
Before using two hand chain hoists, each device must be fully inspected. The inspection includes but is not limited to the following points:
Appearance inspection: Check whether the outer shell of the hand chain hoist has cracks, deformation or other damage to ensure that the appearance of the equipment is intact.
Parts inspection: Check whether key parts such as hooks, chains, ratchets, brakes, etc. are intact, and whether there is wear, deformation or damage. Pay special attention to whether the chain is twisted, knotted or severely worn.
Lubrication: Check the lubrication of the chain and transmission parts to ensure good lubrication to reduce wear and ensure smooth operation.
No-load test: Before officially lifting the heavy object, perform a no-load test to check whether the operation of the hand chain hoist is normal, including whether the chain is lifted smoothly and whether the brake is reliable.
(II) Load assessment
When using two hand chain hoists to lift heavy objects together, the weight of the heavy object must be accurately assessed and the load of each hand chain hoist must not exceed its rated lifting capacity. If the weight of the heavy object is close to or exceeds the rated lifting capacity of a single hand chain hoist, it may cause the equipment to be overloaded, resulting in a safety accident.
(III) Selection of lifting points
Reasonable selection of lifting points is one of the key factors to ensure safety when two hand chain hoists are used together. The selection of lifting points should meet the following requirements:
Strength of lifting points: The lifting points must be able to withstand the lifting weight, including the deadweight of the hand chain hoist and the weight of the heavy object being lifted.
Location of lifting points: The lifting points should be as close as possible to the center of gravity of the heavy object being lifted to reduce the shaking of the heavy object during lifting.
Distribution of lifting points: The lifting points of the two hand chain hoists should be reasonably distributed to ensure that the weight of the heavy object can be evenly distributed on the two devices.

2. Precautions during operation

(I) Unified command
When using two hand chain hoists together, they must be commanded by a dedicated person. The commander should have rich experience and good communication skills, and be able to accurately guide the operator to operate and ensure the coordination and consistency of the operation process.

(II) Coordinated operation
When pulling the chain, the operator should keep the action coordinated to avoid overloading the equipment or shaking the heavy object due to improper operation. The specific operation requirements are as follows:
The force of pulling the chain: The operator should apply force evenly to avoid excessive or light force to avoid chain jumping or jamming.
Pulling direction: The direction of pulling the chain should be in the same plane as the hand chain wheel to avoid oblique pulling.
Synchronicity: The operation of the two hand chain hoists should be synchronized as much as possible to avoid tilting or shaking of the heavy object due to inconsistent speed.
(III) Safety distance
During operation, operators should maintain a safe distance and avoid standing under heavy objects or in the force direction of the chain. In addition, other irrelevant personnel should also stay away from the lifting area to prevent accidents.
(IV) Handling of abnormal situations
During operation, if abnormal conditions are found in the hand chain hoist, such as chain jamming, brake failure, etc., the operation should be stopped immediately, and inspection and repair should be carried out. It is strictly forbidden to continue to operate when the equipment fails, so as not to cause greater safety accidents.

3. Maintenance and care after use
(I) Cleaning and storage
After use, the dirt on the hand chain hoist should be wiped off and stored in a dry and ventilated environment to prevent the equipment from getting damp and rusting.
(II) Regular inspection and maintenance
In order to ensure the long-term and stable operation of the hand chain hoist, the hand chain hoist should be inspected and maintained regularly. The inspection content includes but is not limited to the following points:
Parts inspection: Check the wear of key parts such as hooks, chains, ratchets, etc., and replace damaged parts in time.
Lubrication maintenance: Regularly lubricate the chain and transmission parts to reduce wear and extend the service life of the equipment.
Performance test: Regularly perform static load and dynamic load tests to ensure that the performance of the equipment meets the requirements.

. 4Case analysis
In order to better understand the precautions when two hand chain hoists are used together, the following is an analysis of an actual case:
When a factory is installing equipment, it is necessary to use two hand chain hoists to jointly lift a 5-ton equipment. During the operation, because the operator did not strictly follow the specifications, the chain of one hand chain hoist got stuck, while the other hand chain hoist continued to operate, which eventually caused the equipment to tilt and almost caused a major safety accident.