Views: 0 Author: Site Editor Publish Time: 2022-09-27 Origin: Site
The various connecting chains used by chain conveyor in China are produced according to relevant standards. Their breaking load is about 10 times of the tensile force that the chain plate can withstand. The safety factor is large. In theory, the chain breaking accident should not occur, but the failure rate of the connecting chain in actual use is high. The main reasons are:
1. Under the pulsating load for a long time, when it is far lower than the breaking force, the fatigue failure occurs, and the fracture is generally at the transition joint between the circular arc and the straight line of the link;
2. The manufacturing quality does not meet the standards, and the materials and heat treatment level are not up to the standard;
3. The transmission chain is worn due to constant contact and friction with the chain plate slot, chain wheel, materials, etc. during operation, while the transition joint between the arc and the straight line is the most worn part, and the load-bearing sectional area gradually decreases, leading to a decrease in strength, which is mainly caused by the material or chain plate slot, which causes wear on the outer side of the straight part and the outer side of the arc part of the chain link, and the inner side of the two connecting rings;
4. The connecting link is corroded, resulting in rust, pits and peeling, reducing the sectional area and tensile strength;
5. The chain is jammed when materials are mixed with iron tools, and the chain tension is broken;
6. The transmission chain is frequently started under full load or overload, which makes the impact force borne by the transmission chain exceed the strength limit;
7. The chain pretension is insufficient and too loose, forming a chain pile, causing the chain plate to come out of the slot and the chain is stuck;
8. Excessive pre tension makes the transmission chain too tight, accelerates the wear of the chain, and there is no buffer space when the chain is stuck, reducing the service life;
9. When the distance between the chain plates exceeds twice the required distance, when the chain plate is transported to the machine head, the chain without the chain plate can not slide in the chain plate slot due to the tension of the transmission chain, and the next chain plate can also be stretched with the chain, which interferes with the machine head unloading device, causing the chain to be jammed and broken;
10. The tightness of the two chains is inconsistent, so that the load is concentrated on the tighter chain, thus exceeding the strength limit;
Recently, the Jining High-tech Zone General Trade Union and the Human Resources Department of Jining High-tech Zone jointly announced the 2024 'High-tech Craftsman' list. Li Zhenbo, General Manager of Information Technology at China Coal Group and General Manager of Zhongyun Group, was awarded the title of 'High-tech Craftsman' for his outstanding contributions and innovative spirit.
On September 30th, China Coal Group held a grand cultural performance to celebrate the 75th anniversary of the founding of the People's Republic of China with the theme of 'Forging Ahead to Celebrate the Birthday of the People's Republic of China' in the conference center. The chairman of China Coal Group, Mr. Qiu Qing, the general manager of China Coal Group, Mr. Han Yong, and all the members of the leadership team of China Coal Group attended the event and witnessed the grand celebration together with more than 1,000 employees on the spot. The cultural performance was conducted in the way of 'on-site + webcast', aiming to show the spirit of the cadres and workers of China Coal Group and express the love and blessing to the great motherland through colorful cultural programs.
On September 29th, in this season of autumn and fruitfulness, China Coal Group, full of joy and pride, participated in the ‘Harvest Celebration and National Day’, which was jointly organized by Jining Hi-Tech District Federation of Trade Unions and Jiezhuang Street to welcome the 75th anniversary of the founding of New China and the Farmer's Harvest Festival.
