With the continuous improvement of China's manufacturing technology, the automobile industry is developing rapidly, and the traditional manufacturing mode can no longer meet the needs of the times. Friction transmission line came into being, which is sought after by automobile manufacturers for its advantages of low cost, low noise and easy maintenance. Friction transmission line can effectively reduce the overall manufacturing cost of automobiles, improve the transmission efficiency of automobiles, and prevent the pollution of workshop production environment, which plays an irreplaceable role in the progress of China's automobile manufacturing industry. Therefore, it is of great significance to study and analyze the friction transmission line.

1 overview of friction transmission line

1.1 characteristics of friction transmission line

The main characteristics of friction transmission line are energy saving, environmental protection, easy maintenance, convenient maintenance, flexible control of conveying speed according to requirements, stable operation, simple structure, easy operation, high cost performance and wide application range, which are favored by automobile manufacturers. In today's society, under the background of vigorously advocating energy conservation and ecological environment protection, friction transmission line has a wide application range and broad development space.

1.2 the structure type of friction transmission transmission line

According to different structures, friction transmission lines can be divided into two categories: ground friction lines and air friction lines. In the actual working process, manufacturers can choose different friction lines according to different work requirements. The friction line is mainly composed of track, turnout, friction drive device, stopper, positioning device, train set, detection device, gas circuit system and electric control system, etc. At present, there are two track types of friction conveyor; One is H type, which is made of section steel; The other is double channel steel, which is welded by bracket.

2 The working principle of friction transmission line

The purpose of the friction transmission line is to transport the body parts from one workshop to another through the train set, so as to realize the logistics transportation of all parts on the automobile production line, that is, the production line, so as to ensure the smooth progress of the production work. The power of the conveying line comes from many small driving stations installed beside the line body. These driving stations are composed of friction wheels, unpowered auxiliary wheels and driving motors, each of which plays a different role and plays an irreplaceable role. In the working process, the driving motor drives the friction wheel to rotate, so that the friction wheel and the auxiliary wheel sandwich the cross beam of the conveying trolley through the spring. Among them, the side surface of the friction wheel is made of polyurethane, which can produce a large friction coefficient between the friction wheel and the side surface of the cross beam of the conveying trolley, thus producing a large friction force. When the friction wheel rotates, there will be enough friction to drive the conveying trolley to move forward, so as to realize the conveying of various parts between different stations. There are many driving stations distributed in the whole conveying line, and each driving station is separated by a certain distance, so as to ensure that articles are continuously transferred from one driving station to another, so that all parts of the automobile can be conveyed from one workshop to another.

The motor power of each driving station on the friction line is very small. Only when the trolley arrives, the motor of each driving station will rotate and work under the decentralized centralized control of the system. When the trolley leaves the driving station, the driving motor will stop rotating. This working mode can save energy, improve the utilization rate of resources and prolong the service life of equipment to a great extent. However, the traditional automobile production line adopts a push rod chain conveyor line, which uses a high-power drive motor to drive the chain continuously to achieve the purpose of conveying automobile parts. Compared with the two, the friction transmission conveyor line has more obvious advantages.

Comparative analysis of 3 stacking chain, skid conveyor line and friction transmission conveyor line

In the transportation, storage and queuing sections, the stacking chain transportation line uses the fast transportation chain, and takes the trolley or spreader as the carrier, so the transportation efficiency is low. Moreover, the sling is easy to shake in the actual operation process, and it is easy to have potential safety hazards. At the same time, the applicability and flexibility of the spreader are poor, so it can't be widely used in multi-vehicle transportation process, and its work efficiency is low. Moreover, it will produce a lot of noise during operation, which will bring adverse effects to the production environment. In the process of working, the chain wear often occurs, which needs to be repaired in time, which increases the operating cost and restricts the smooth progress of workshop work. As a kind of mechanical chain, the chain of stacking chain needs to be lubricated frequently in the working process, which brings adverse effects to the workshop environment. It needs to be cleaned frequently, which affects the enthusiasm of employees and reduces the production efficiency.

Roller bed or chain conveyor is usually used in conveying, storage and queuing sections of skid-type conveying lines, and skid is mainly used as the main transportation carrier, so the transportation efficiency is relatively higher than that of stacking chain conveying lines. In the actual working process, the empty skid operates in the form of stacking, which helps to reduce the impact of inventory on the delivery of goods. The skid runs smoothly, and the accuracy of positioning and switching is greatly improved. The skid-type stacking chain does not need lubrication during operation, which reduces the environmental pollution of oil stains to the production workshop, and does not produce noise at the same time, enabling employees to work more attentively. In addition, compared with the traditional stacking chain, the chain of skid stacking chain is not easy to wear during working. However, it still needs to be maintained every 1 ~ 2 years. Although skid-type conveyor chain has great advantages in the working process, its manufacturing cost is high, and it is difficult to be widely popularized in automobile manufacturers.

Friction transmission line usually adopts friction transmission drive mechanism in the transmission, storage and queuing sections, and mainly uses trolley and trolley as the main transport carriers, which has high transport efficiency. In the actual working process, the trolley can bear part of the shaking amount. Compared with the traditional suspension chain conveying mode, its running process is more stable, and the precision of positioning function and switching function is higher. In addition, because the friction transmission line runs by friction, it does not need to be lubricated, and the noise is small. The chain of friction transmission line is not easy to wear, and only the trolley needs regular inspection and maintenance.

4 Application advantages of friction transmission line

Through the comparative analysis of the working principle, structural characteristics and different transmission modes of friction transmission line, it can be found that friction transmission has great advantages in practical application. In the automobile production line, after the automobile body is sprayed, the automobile body is placed on a large skateboard, and then installed at the corresponding position by the operator, and transported forward together through the transmission line, which effectively reduces the actual difficulty in the operation. In the link of air transportation of car body, the chassis is equipped with air friction line, and the car body is pushed forward by the joint action of spreader and friction wheel, which can effectively reduce the resistance of curve to car body transportation. The power lines and signal lines used in the practical application of the electric control system can effectively reduce the workload of wiring and reduce the consumption of electric energy. The application of friction transmission line can save a lot of production costs for automobile manufacturers, improve the working environment of employees and enhance production efficiency, so it has been widely used.

5 Conclusion

With the rapid development of China's economy and the continuous improvement of manufacturing technology, people are looking for ways to improve production quality and work efficiency from all aspects. In the aspect of automobile production and manufacturing, the appearance and application of friction transmission line plays an inestimable role in promoting the development of automobile manufacturing industry. Therefore, enterprises should combine their own production needs, attach importance to the role of friction transmission lines, increase investment in capital and scientific research, and optimize the performance and mode of friction transmission lines to improve the production efficiency of automobiles in China.