What are the key points for safe operation of hand chain hoists in the construction industry?

What are the key points for safe operation of hand Chain Hoists in the construction industry?

1. Inspection before use
1.1 Appearance inspection of equipment
In construction, the appearance inspection of hand chain hoists is the first line of defense for safe operation. During the inspection, it is necessary to ensure that the hoist shell is intact without damage or deformation, and all fixings are complete and not loose or missing. Appearance inspection can effectively avoid safety hazards caused by equipment damage. For example, damage to the shell may expose internal parts, increase the risk of electric shock or mechanical injury; loose fixings may cause the equipment to fall off during use, causing casualties or property losses.
1.2 Rated lifting weight verification
Checking the rated lifting weight of the hand chain hoist is a key step to ensure safe operation. The weight of materials used in construction varies greatly, so the hand chain hoist of appropriate tonnage must be selected according to the actual lifting weight. Overloading is strictly prohibited, otherwise it may cause serious consequences such as chain breakage and brake failure. For example, a construction site once used a hand chain hoist due to overloading, resulting in chain breakage and heavy objects falling, causing a major safety accident. When checking the rated lifting capacity, it is also necessary to check whether the diameter of the lifting chain, the connecting bolts, etc. match the lifting tonnage of the hoist to ensure the safety of the entire system.
1.3 Inspection of key components
The inspection of key components is the core link to ensure the safe operation of the hand chain hoist. First, check whether the lifting chain has obvious deformation, damage, cracks, etc., and whether the fixing state of the chain connecting ring is normal. The chain is the main force-bearing component of the hand chain hoist, and its quality is directly related to the safety of the lifting process. Secondly, check whether the braking device is flexible, without sticking or loosening, and whether the brake can quickly stop the movement of the hoist. The reliability of the braking device is the key guarantee to prevent the uncontrolled fall of heavy objects. In addition, it is necessary to check whether the operating handle is flexible, whether the function is normal, and whether the wire rope has problems such as fatigue fracture, wear, and rust. The inspection of these key components can effectively reduce the equipment failure rate and ensure the life safety and construction progress of construction personnel.

2. Operator requirements
2.1 Professional training
The operator of the hand chain hoist must undergo professional training, which is an important prerequisite for ensuring the safety of construction. The training content includes the basic structure, working principle, operation process and emergency response methods of the equipment. For example, in the operation process training, operators should be clearly informed that they cannot overload when lifting heavy objects, they must be tied firmly and reliably when lifting objects, and it is strictly forbidden for people to work or walk under heavy objects. After the training, the operator should pass a strict assessment, which covers theoretical knowledge and practical operation skills to ensure that they have the ability to operate the hand chain hoist skillfully and in a standardized manner. According to statistics, the probability of safety accidents occurring during the construction process of operators who have received professional training is more than 80% lower than that of untrained personnel, which fully demonstrates the key role of professional training in ensuring construction safety.
2.2 Health status
People who operate hand chain hoists need to have good physical fitness and health status. Since the operation of hand chain hoists requires a certain amount of physical strength and energy, people with heart disease, hypertension, epilepsy and other diseases should not engage in this work. For example, people with heart disease may suffer from sudden diseases due to excessive physical exertion during the operation, which may lead to operational errors and safety accidents. In addition, operators should keep a clear mind before operation, and it is strictly forbidden to work after drinking or fatigue. According to relevant statistics, the probability of accidents when operating a hand chain hoist in a fatigued state is more than 3 times that in a normal state. Therefore, construction companies should regularly conduct health checks on operators, establish health records, ensure that their physical condition meets the operating requirements, and provide strong protection for the safety of construction.

3. Safety points in the hoisting process
3.1 Overload limit
In construction, overloading of hand chain hoists is an extremely dangerous behavior and must be strictly prohibited. Overloading will cause key components such as chains and hooks of hand chain hoists to bear stress exceeding their design limits, thereby causing fractures, deformations and other failures, causing heavy objects to fall, endangering the lives of construction workers and the integrity of construction equipment. According to relevant statistics, safety accidents caused by overloading hand chain hoists account for more than 30%. Therefore, during the hoisting process, operators must always pay attention to the lifting weight to ensure that it is within the rated lifting weight range of the hand chain hoist. At the same time, load tests should be carried out regularly on the hand chain hoist to verify its load-bearing capacity in actual use and ensure the safety and reliability of the equipment.
3.2 Lifting position and personnel safety
The selection of the lifting position and the safety protection of personnel are important links in the safe operation of the hand chain hoist. During the lifting process, the hanging frame of the hand chain hoist should be ensured to be firm and reliable to avoid the overturning or sliding of the equipment due to the instability of the supporting structure. In addition, when lifting objects, other personnel except the operator shall not approach the lifted goods, and personnel are strictly prohibited from doing any work or walking on or under the heavy objects. According to the analysis of accident cases, about 40% of the lifting accidents are caused by personnel being in dangerous positions or walking around at will during the lifting process. Therefore, a clear warning area should be set up at the construction site, and a special person should be arranged for supervision to ensure the safety of the lifting area. At the same time, the operator should stand in a safe area, hold the handle firmly, and must not let go at will, stay focused, and avoid operating errors due to distraction.

4. Equipment maintenance and care
4.1 Regular inspection cycle
Regular inspection of hand chain hoists is a key link to ensure their long-term safe operation. According to the actual needs of the construction industry and the frequency of equipment use, it is recommended to formulate the following regular inspection cycle:
Daily inspection: The operator should conduct a comprehensive inspection of the hand chain hoist before each use, including the appearance, key components (such as chains, hooks, brakes, etc.) and the function of the operating handle. Daily inspection can detect potential problems in time and avoid equipment working with problems. For example, check whether the chain is bent, twisted or cracked, whether the hook is deformed or worn, and whether the brake is flexible and reliable. Although these inspection items are simple, they can effectively reduce the failure rate of the equipment during use.
Weekly inspection: Carry out a more detailed inspection once a week, focusing on the lubrication system and wear of key components of the hand chain hoist. For example, check the lubrication of the chain to ensure that the chain surface is free of rust and well lubricated to reduce friction and wear. At the same time, check whether the opening of the hook meets the standard. If the opening of the hook exceeds 10% of the original size, it should be replaced immediately. Weekly inspections can timely discover and deal with some hidden problems and extend the service life of the equipment.
Monthly inspections: Perform a comprehensive maintenance inspection every month, including cleaning, lubrication, adjustment and replacement of some parts of the equipment. For example, clean the dust and oil on the surface of the equipment, replace severely worn chains or hooks, check and adjust the tightness of the brakes to ensure that they can brake quickly in an emergency. Monthly inspections can effectively prevent equipment failures and ensure the stability and safety of the equipment in long-term use.
Annual inspections: Hand chain hoists should be fully tested for performance and maintained every year. Annual inspections should be conducted by professional technicians or equipment manufacturers, including load tests on equipment, in-depth inspections and replacements of key components. For example, load tests are conducted to verify whether the equipment's load capacity and braking performance meet the standards. Annual inspections can ensure that the equipment can maintain good performance after long-term use and avoid safety hazards caused by long-term wear.
4.2 Common fault handling
During construction, hand chain hoists may have some common faults. Timely handling of these faults can avoid equipment damage and safety accidents. Here are some common faults and how to deal with them:
Chain jam: When the chain jams, it may be caused by deformation of the chain or foreign matter entering the chain. First, stop the operation and check whether the chain is deformed or damaged. If the chain is deformed, replace it with a new chain. If it is because of foreign matter entering the chain, clean the foreign matter and relubricate the chain to ensure its flexible operation.
Brake failure: Brake failure may cause heavy objects to fall out of control, which is an extremely dangerous fault. When the brake fails, stop using the equipment immediately and check whether the friction plate of the brake is severely worn or oily. If the friction plate is severely worn, replace it with a new one. At the same time, check whether the spring of the brake is loose and adjust or replace it if necessary. After troubleshooting, a load test is required to ensure that the brake can work properly.
Chain breakage: Chain breakage is usually caused by overload or chain fatigue. When the chain breaks, stop using the equipment immediately and replace it with a new chain. At the same time, check whether the load of the equipment exceeds the rated lifting weight to avoid overloading again. In addition, it is necessary to check whether the connecting ring of the chain is firm to ensure the connection strength of the chain.
Difficulty in operating the handle: Difficulty in operating the handle may be caused by rust or insufficient lubrication of the internal parts. The lubrication inside the handle should be checked, and the rust and impurities should be cleaned and relubricated. If the internal parts of the handle are damaged, the damaged parts should be replaced in time to ensure that the handle can be operated flexibly.
Hook deformation or cracks: The hook is a key component of the hand chain hoist. Its deformation or cracks may cause the heavy objects to fall off. When the hook is found to be deformed or cracked, the equipment should be stopped immediately and replaced with a new hook. At the same time, check whether the opening degree of the hook meets the standard to ensure the safety of the hook.
Through regular inspections and timely handling of common faults, the service life of the hand chain hoist can be effectively extended, ensuring its safe operation in construction, and providing strong protection for the life safety of construction workers and construction progress.

5. Environmental considerations
5.1 Weather conditions
In construction, the safe operation of the hand chain hoist is significantly affected by weather conditions. Bad weather may cause equipment failure and operational errors, leading to safety accidents.
Strong wind weather: When the wind speed exceeds level 6, the hoisting operation of the hand chain hoist should be stopped immediately. Strong winds can cause heavy objects to swing greatly, increase the instability of the hoisting process, and may cause the heavy objects to collide with surrounding objects or personnel, or even cause the equipment to overturn. For example, at a coastal construction site, the heavy objects swung and hit the scaffolding due to the failure to stop the hoisting operation under strong winds in time, causing the scaffolding to partially collapse. Fortunately, no casualties were caused.
Heavy rain weather: Heavy rain can cause the equipment surface and the operator's vision to be blurred, increasing the difficulty of operation. At the same time, rainwater may penetrate into the interior of the hand chain hoist, causing problems such as chain corrosion and brake failure. In heavy rain weather, the hand chain hoist should be properly stored to avoid damage to the equipment. According to statistics, safety accidents caused by equipment failure due to heavy rain account for about 10%.
High temperature weather: In a high temperature environment, operators are prone to fatigue and physical exhaustion, affecting the accuracy and stability of the operation. In addition, high temperature may cause the equipment lubricating grease to become thinner, reduce the lubrication effect, and increase the equipment failure rate. It is recommended to arrange the working hours of operators reasonably in hot weather, avoid long-term continuous operation, and check the lubrication of the equipment regularly.
Low temperature weather: Low temperature will make the metal parts of the hand chain hoist brittle and reduce its strength and toughness. For example, the chain may become fragile and easy to break at low temperatures. At the same time, low temperature may also cause the lubricating oil to solidify, affecting the normal operation of the equipment. In a low temperature environment, lubricating oil suitable for low temperature environment should be used, and the equipment should be preheated to ensure that it works within the normal temperature range.
5.2 Site condition requirements
Site conditions are also crucial to the safe operation of the hand chain hoist. Inappropriate site conditions may cause equipment instability and operational errors.
Ground flatness: The support structure of the hand chain hoist must be placed on a flat and solid ground. If the ground is uneven or there are soft areas, it may cause the equipment to tilt or overturn, increasing the danger of the lifting process. For example, at a construction site, due to uneven ground, the hand chain hoist tilted during the lifting process, and heavy objects fell, causing equipment damage and personnel injuries. Therefore, before hoisting, the flatness and load-bearing capacity of the site should be carefully checked, and the ground reinforcement should be carried out if necessary.
Space limitation: There should be enough space in the hoisting area to avoid collision between heavy objects and other objects. In narrow construction sites, the hoisting path should be planned in advance to ensure that the heavy objects can be moved to the designated location safely and smoothly. According to the analysis of accident cases, about 20% of hoisting accidents are caused by insufficient hoisting space.
Lighting conditions: Good lighting is an important factor to ensure the safe operation of hand chain hoists. In an environment with insufficient light, it is difficult for operators to accurately judge the hoisting position and surrounding conditions, which can easily lead to operational errors. Therefore, when hoisting operations are carried out at night or in dimly lit sites, sufficient lighting equipment should be provided to ensure that operators can clearly see the hoisting process.
Surrounding environment: Dangerous factors such as high-voltage wires and flammable and explosive items should be avoided around the hoisting area. If the hand chain hoist is close to high-voltage wires, it may cause electric shock accidents; if there are flammable and explosive items around, the fall of heavy objects or equipment failure may cause fire or explosion. Therefore, before lifting, the surrounding environment should be carefully checked to ensure the safety of the lifting area.

6. Summary
The key points of safe operation of hand chain hoists in construction cover many aspects, including pre-use inspection, operator requirements, safety points during lifting process, equipment maintenance and environmental factors. Through strict pre-use inspection, including equipment appearance, rated lifting weight verification and key component inspection, safety hazards caused by equipment damage or non-compliance can be effectively avoided. Professional training and good health of operators are important prerequisites for ensuring construction safety. The probability of safety accidents during construction for operators who have received professional training is significantly reduced. During the lifting process, strict compliance with overload restrictions and reasonable lifting position selection, as well as strict control of personnel safety, can effectively reduce the occurrence of lifting accidents. Regular equipment maintenance and maintenance, including reasonable inspection cycles and timely handling of common faults, can extend the service life of hand chain hoists and ensure their safe operation. At the same time, full consideration of environmental factors, such as weather conditions and site conditions, can take appropriate measures in adverse environments to avoid safety accidents caused by environmental factors. These key points of safe operation together constitute an important guarantee system for the safe use of hand winches in construction, which is of great significance for ensuring the safety of construction workers, the smooth progress of construction and the integrity of construction equipment.