How to reduce the impact of temperature on electric hoist chains

How to reduce the impact of temperature on Electric Hoist chains
In industrial production and hoisting operations, electric hoist chains are key components, and their performance and life are significantly affected by temperature. For electric hoist chain independent stations that mainly serve international wholesale buyers, it is crucial to provide customers with professional temperature protection knowledge. The following is a detailed explanation:

I. The impact of temperature on electric hoist chains
(I) High temperature impact
Material performance changes: Electric hoist chains are usually made of metal materials such as manganese steel. Under high temperature conditions, the chemical composition and metallographic structure of the chain may change. For example, when the temperature exceeds a certain limit, the internal lattice structure of the steel will change, resulting in a decrease in strength and toughness. Its tensile strength will gradually decrease with the increase in temperature, and under continuous high temperature, the chain is more likely to deform and break. Generally, when the temperature reaches 200℃-300℃, the strength of steel may decrease by about 10%-20%.
Accelerated wear and deformation: High temperature will increase the friction between chains and between chains and sprockets. Because high temperature can cause the performance of lubricants to deteriorate or fail, causing direct contact and friction between metal surfaces. The increase in the friction coefficient will accelerate the wear of the chain and make the surface of the chain rough, which will further affect the meshing of the chain and the sprocket, resulting in reduced transmission accuracy. At the same time, continuous high temperature will also cause the chain to elongate due to thermal expansion, affecting its normal use.
Causing thermal fatigue: Under repeated high temperature, the chain will experience thermal fatigue. For example, in some lifting operations that require frequent start and stop, the temperature of the chain will rise and fall periodically, generating thermal stress. This thermal stress will gradually accumulate, causing micro cracks on the surface or inside of the chain. Over time, these cracks will gradually expand and eventually cause fatigue fracture of the chain.
(II) Low temperature effect
Reduced toughness: In low temperature environments, the toughness of the chain will be significantly reduced. Metal materials will undergo a cold brittle transition at low temperatures, that is, from a tough state to a brittle state. Taking the common manganese steel chain as an example, when the temperature is below a certain critical value (such as around -20°C), its toughness will drop sharply, and it is easy to cause brittle fracture when subjected to impact loads. For example, when working outdoors in the cold winter, the chain may break due to collision or sudden impact during the lifting of heavy objects.
Difficulty in lubrication: Low temperature will increase the viscosity of the lubricant and even solidify it. This will cause the lubrication effect of the chain to deteriorate, increase the wear and running resistance of the chain. Moreover, at low temperatures, the water in the lubricant may freeze and form ice slag, further hindering the normal movement of the chain and even causing the chain to jam.
Increased stress concentration: Since the low temperature makes the chain brittle, its sensitivity to stress concentration will also increase. There may be some minor defects in the chain during the manufacturing process, such as cracks, inclusions, etc. In a low temperature environment, these defects are prone to become stress concentration sites, thereby accelerating the chain breakage.

2. Methods to reduce the impact of temperature on electric hoist chains
(I) Protection measures in high temperature environments
Choose appropriate materials and coatings
The chain is made of high-temperature resistant alloy materials, such as alloy steel with added elements such as chromium and nickel. These elements can improve the high-temperature resistance of steel, so that it can maintain good strength and oxidation resistance in high temperature environments. For example, heat-resistant steel containing chromium can be used in an environment of 500℃ - 600℃, and a dense chromium oxide film will be formed on its surface to prevent further oxidation of the internal metal.
Coating the surface of the chain, such as using a high-temperature resistant ceramic coating. Ceramic coating has good heat resistance and heat insulation, and can form a protective film on the surface of the chain to reduce the transfer of heat to the inside of the chain, and at the same time reduce the friction coefficient between the chain and the sprocket. Common ceramic coatings include aluminum oxide coatings, silicon nitride coatings, etc.
Optimize design and heat dissipation
Improve the structural design of the chain and increase the heat dissipation area. For example, the chain plate of the chain can be designed to be fin-shaped or hollow, which can increase the contact area between the chain and the air and facilitate heat dissipation. At the same time, when designing the sprocket, it is possible to consider setting up heat dissipation channels at the hub and spokes of the sprocket so that the air can circulate better and take away the heat.
Strengthen the heat dissipation system of the electric hoist. Heat sinks, fans or water cooling devices can be installed on the heating parts such as the motor and reducer of the electric hoist. For example, using a high-power fan can accelerate air flow, dissipate the heat generated by components such as motors and chains in a timely manner, and reduce the operating temperature of the entire equipment.
Reasonable use and maintenance
Control the working time and load of the electric hoist. In a high temperature environment, avoid using the electric hoist continuously for a long time, and increase the rest time appropriately to allow the equipment to cool down. At the same time, strictly abide by the rated load of the equipment and avoid overloading, because overloading will cause the chain to be subjected to greater stress, which will accelerate the damage of the chain together with the high temperature.
Regularly check the operation and lubrication of the chain. In a high temperature environment, the consumption of lubricants will accelerate, so it is necessary to check and replenish lubricants more frequently. At the same time, check whether the chain has defects such as deformation, wear, and cracks, and replace the problematic chain in time. For example, check the lubrication of the chain at least once a week, and conduct a comprehensive appearance inspection of the chain every month.
(II) Protection measures in low temperature environments
Improvement of materials and manufacturing processes
Select materials with good low-temperature toughness to manufacture chains, such as certain grades of low-alloy high-strength steel, which can still maintain high toughness in low-temperature environments. These materials can further improve their toughness after appropriate heat treatment processes. For example, through quenching and tempering treatment, steel can obtain good comprehensive mechanical properties and resist impact loads without breaking at low temperatures.
Use advanced manufacturing processes to improve the quality and precision of the chain. For example, the use of precision forging technology can make the chain grains finer and more uniform, reduce internal defects, and improve its ability to resist low-temperature brittle fracture. At the same time, strict manufacturing processes can ensure the dimensional accuracy and shape accuracy of the chain, making it smoother to cooperate with the sprocket in low-temperature environments.
Lubrication and protective measures
Choose a suitable low-temperature lubricant. In low-temperature environments, lubricants with low freezing points, good fluidity and lubricity should be used. For example, synthetic lubricants such as ester lubricants and silicone lubricants can maintain good lubrication properties at temperatures of -40℃ or even lower. Before use, the lubricant should be preheated and stirred as required to ensure that it is evenly distributed on the chain.
Protect the electric hoist and chain. When working outdoors at low temperatures, a heat preservation cover or protective shed can be built for the electric hoist to prevent the chain from being eroded by rain, snow, and frost. At the same time, after the work is finished, clean the ice and debris on the chain in time to prevent it from freezing on the chain and affecting the next use.
Preheating and operation precautions
Before starting the electric hoist at low temperature, preheat the chain and motor and other components. The equipment can be preheated by electric heating, hot air heating, etc., so that the temperature of the chain gradually rises to a suitable operating temperature range. For example, use a small electric heater to preheat the chain locally, or use a hot air circulation device to preheat the entire electric hoist.
During operation, avoid sudden impact loads and frequent starts and stops. In a low temperature environment, the chain is more brittle, and sudden impact loads can easily cause it to break. Therefore, when lifting heavy objects, the operation should be slow and smooth to minimize shaking and collisions. At the same time, reduce the number of unnecessary starts and stops, because each start and stop will cause a certain stress shock to the chain.

3. Temperature monitoring and automatic control
Install temperature sensors: Install temperature sensors at key parts of the electric hoist chain, such as the middle position of the chain, near the sprocket, etc. These sensors can monitor the temperature changes of the chain in real time and transmit the temperature signal to the control system. For example, thermal resistance temperature sensors or infrared temperature sensors are used, which have high measurement accuracy and response speed.
Automation control system: Establish an automation control system to automatically control the operation of the electric hoist according to the signal fed back by the temperature sensor. When the temperature exceeds or falls below the set safety range, the control system can automatically issue an alarm to remind the operator to take measures. At the same time, the control system can also automatically adjust the working parameters of the electric hoist according to the temperature conditions, such as reducing speed and load, to reduce the impact of temperature on the chain. For example, when the chain temperature reaches 80℃, the control system automatically reduces the lifting speed of the electric hoist to avoid further increase in temperature.

IV. Case analysis
High temperature case: A factory uses electric hoists for frequent lifting operations in high temperature environments in summer. Due to the lack of effective heat dissipation measures, the chain often overheats, resulting in a decrease in its strength and frequent chain breakage accidents, affecting production progress. Later, the factory used chains made of high-temperature resistant alloy materials and installed cooling fans and heat sinks on the electric hoist. At the same time, the operation process was optimized and the working time and load were controlled. After these improvement measures, the service life of the chain was significantly extended and the accident rate was greatly reduced.
Low temperature case: On a construction site in a cold area in the north, the temperature in winter is often below -20℃. The chain of the electric hoist becomes fragile in a low temperature environment, breaks many times, and there is also a problem of poor lubrication. In order to solve these problems, the construction party replaced the chain material with good low-temperature toughness and used low-temperature lubricant. At the same time, a protective shed was built for the electric hoist, and the equipment was preheated before use. Through these measures, the chain operated well throughout the winter construction process, ensuring the smooth progress of the construction.
In summary, temperature has an important influence on the performance and life of the electric hoist chain. By taking effective protective measures for high and low temperature environments, strengthening temperature monitoring and automatic control, and drawing lessons from actual cases, the impact of temperature on the electric hoist chain can be significantly reduced, its reliability and service life can be improved, and better quality and more durable products can be provided to international wholesale buyers. This is of great significance for the electric hoist chain independent station to expand the international market and improve customer satisfaction.