The present situation and Prospect of technology and equipment of transmission belt in China
Transmission is one of the important transmission forms of mechanical transmission. With the continuous improvement of industrial technology and the requirements of precision, lightweight, functional and personalized mechanical equipment, its application range is more and more wide, and the transmission forms are more and more. As the main part of belt transmission, the transmission belt has also changed from the original vulnerable parts to functional parts, and its varieties and specifications have developed to diversity. From the traditional ordinary cloth wrapped belt and ordinary flat belt, the narrow band and wide band combined belt, trimming belt, multi wedge belt, synchronous belt, rope core flat belt and sheet base flat belt have been developed. These transmission belts have been widely used in various fields such as automobile machinery, textile, home appliances, light industry and agricultural machinery, and are playing an increasingly important role in the national economy and people's daily life.
With the variety of transmission belts and the continuous improvement of the performance standards, new materials, new technologies and new processes are continuously adopted in the production of transmission belts, and more and more advanced production equipment and testing methods are used.
Through years of introduction, digestion, absorption and self-development, the tooling equipment for the production of transmission belts in China has made great progress. Especially since the 1990s, the production line rope, belt, trimming belt, synchronous belt and multi wedge belt have been the main substitutes to meet the needs of the production of transmission belts in China. This paper mainly expounds the development of production technology and equipment of transmission belt in China in recent years, and introduces its current situation and future development.
Wrapped fabric, belt wrapped fabric can be divided into wrapped cord fabric 7 belt and wrapped cord fabric according to its skeleton material structure. It has the advantages of reasonable structure, uniform stress and small bending stress, which can greatly improve the service life and performance of the belt. As early as the 1960s, the advanced industrial countries had completed the upgrading of the belt structure rope. China did not start the large-scale structural transformation of the wrapped belt rope until the middle and late 1990s.
According to its cross-sectional shape and use requirements, the wire rope wrapped cloth belt can also be divided into ordinary belt, narrow-band automobile belt and variable-speed belt for agricultural machinery. Its manufacturing process is mainly to prepare the wire rope hanging rubber, extrude and cut the compressed rubber strip, compress the rubber wrapped cloth on the forming line, vulcanize, and inspect the external dimensional performance.
The forming process of wire wrapped cloth belt is to combine the various parts of the belt body into a belt blank. These processes include the wire arrangement of the tensile body, the bonding film, the bonding of the stretching film and the compressed film strip, and the wrapping. These processes can be completed at one time according to the different processes. For example, the manual single piece forming of the automobile belt has been gradually eliminated, or it can be completed gradually, that is, the wire rope adhesive film, the stretched film and the compressed film strip are first made into a trapezoidal belt core, and then wrapped into a belt blank.
The forming method of single drum with core is carried out on a single drum forming machine. The structure of the single drum forming machine is similar to that of the trimming belt forming machine. It is mainly composed of the main drive device, the expansion drum cutting device, the sheath grinding device, the tailstock discharging and wiring device, the wire tension system and the electrical control system. Through digestion and absorption, Qingdao Yilida has completed the scientific research project of this machine during the Ninth Five Year Plan period and passed the appraisal of the original chemical industry department. The forming method is the reverse forming method, that is, according to the specifications, the sheath is first made on the expansion drum, and then the stretched film is wrapped, the film is bonded, and the film is compressed by the wire rope. Then, part of the rubber is cut off by the shape knife, and then the disc knife is cut into the tape core. The biggest advantage of this method is that the tension of the wire rope is uniform and the degree of automation is high. Due to the time-consuming and labor-consuming manufacturing of the cutting sheath and the limitation of the size of the expansion drum, it is suitable for the large-scale production of the 2500nmv belt with a single specification and model length.
Why can't imported bearings be used when they are damaged early?
The damage state of the bearing, such as the abrasion of the ring retaining edge of the roller bearing, may be caused by insufficient lubricant, inappropriate brand, defects in the oil supply and drainage structure, invasion of foreign matters, installation error of the bearing or excessive deflection of the shaft, or may be caused by a combination of the above reasons.
Therefore, it is difficult to know the cause of damage only by investigating the bearing damage. However, if we fully understand the machine, working condition and external structure of the bearing, understand the situation before and after the failure, and analyze the damage of the imported bearing and various related reasons, we can prevent the recurrence of similar failures.
Development status of synchronous belt industry
Synchronous belt is a common configuration of glass edging machine. The quality of synchronous belt determines the processing accuracy of glass edging machine.
However, some manufacturers of synchronous belt of glass edging machine are large but not strong, some are backward in technology, some do not have relevant research and development at all, and some enterprises start blindly without market awareness!
Product quality is related to the development of enterprises, the advantages of enterprises in market competition and the survival of enterprises. Product quality is the basic symbol to measure the strength of an enterprise. In a certain sense, it is also an important symbol to measure the quality of an industry and the level of technical governance. All successful enterprises at home and abroad attach great importance to product quality and its management. Some people said: "where the quality is, the market is where the quality is, and the market is as large as the quality is." "Quality is the lifeline of an enterprise" and so on. These words have profound truth. As a production enterprise, we must take improving product quality as the strategic focus.
In order to gain a foothold in the fierce market competition, we must ensure the product quality, carry out research and development and improvement of technology, improve and improve the production equipment, and improve the inspection and detection means! To improve the safety performance of the product, we should also improve the use performance of the product!
At present, the production equipment level of synchronous belt of glass edging machine has been greatly improved than before, and the product quality of synchronous belt has been improved. However, in terms of technology, we found in the safety standard review that many manufacturers still stay at the level of their own competition due to insufficient funds, low R & D capacity and inadequate technology input, and still treat their own technology with a fair attitude. How can they face the quality competition? Quality is the life of products. Without quality, there is nothing. "I'm not afraid of not knowing the goods, but I'm afraid of comparing the goods.". Under the market competition mechanism of survival of the fittest, it is urgent to improve product quality!
At present, through continuous adjustment, from the original 680s ~ 1400s glass edging machine synchronous belt, some factories have developed to 2500s, and others have developed to 2800s. The production of high-strength glass edging machine synchronous belt requires high production equipment, which requires stable tension, speed and temperature. There are only about 8 manufacturers capable of producing high-strength glass edging machine synchronous belt, and many manufacturers have not been able to transform production equipment.
Misunderstanding on lubrication of needle roller bearing
If your needle roller bearing is not properly lubricated, it will definitely fail. Unfortunately, not everyone knows how or when to lubricate needle roller bearings.
Here are some common misconceptions about this issue that you should avoid.
Myth: the method of storing grease is not important
The cleanliness of needle roller bearings is very important because even the smallest contaminants can affect their function.
It is for this reason that people have experienced such extremes to keep needle roller bearings free from pollution. But usually, they pay little attention to where or how they store oil.
If the needle roller bearing is lubricated with contaminated grease, it is impossible to keep the needle roller bearing free from contamination.
Myth: you only need to replenish it once a year
It is true that some manufacturers only recommend re lubrication once a year, but this is under ideal and unrealistic conditions.
The daily use of needle roller bearings and their operating environment will play an important role in determining when to re lubricate them. Some needle roller bearings need to be re lubricated once a week and often more.
Myth: any grease will work
Not all greases are the same. And of course you don't want to combine two types of grease that are incompatible with each other.
Mixing two incompatible greases may cause thickening in some cases or thinning in others. Both of these conditions will shorten the service life of the needle roller bearing.
Fact: lubrication keeps your needle bearing alive
Adding new, clean and compatible grease to needle roller bearings can bring many benefits. It can certainly keep them properly lubricated, but it can also clean them.
New grease helps remove old grease and any residual contaminants. The grease will eventually decompose due to temperature. If your needle roller bearing is under great pressure, it needs to be re lubricated more frequently.
