The conveyor belt is slipping. The reason is that the frictional traction of the roller is reduced, overloaded, or the tape is jammed.
① The tape stretches due to plastic deformation after using for a period of time, resulting in insufficient tape tension, reduced frictional traction and slipping.
② When the contact surface between the belt and the drive drum is immersed in muddy water or dust, the friction coefficient drops sharply, and the belt slips.
③Damage of the idler, entanglement of debris, buried pressure of materials, etc. will cause a large number of idlers to not rotate, the damaged tape or joints will increase the resistance when passing the idler, the tape deviation is serious, and the loading of too much goods will cause the tape resistance. Too big and cause the tape to slip.
The implementation of a tight monetary policy has led to the rigidity of purchase settlement, which has brought huge cost and capital pressures to the majority of production enterprises. The main raw materials produced, such as natural rubber, synthetic rubber, steel wire, steel cord, various chemical auxiliary materials, coal, etc., have frequently hit historical highs and resources are extremely tight. The average price of imported 20# standard rubber in 2007 was US$2051/ton, which rose to US$2,200/ton at the beginning of this year, and the price reached US$2800/ton at the end of April. By June 18, the price was 3280 yuan/ton, which is an increase from the beginning of the year. Over 49%; the average purchase price of domestic 5# rubber in 2007 was 19,341 yuan/ton, which rose to 20,400 yuan/ton at the beginning of this year, and reached 23,000 yuan/ton at the end of April. By June 18, the price was 28,000 yuan/ton. The price increased by more than 37% over the beginning of the year; the average price of chlorinated butyl rubber in 2007 and the price at the beginning of 2008 was 48,800 yuan/ton, the price rose to 79,000 yuan/ton at the end of April, and the price was 100,000 yuan/ton on June 18. At present, the price has increased by more than 104% compared with the beginning of the year; the average price of tempered steel wire in 2007 was 6000 yuan/ton, and at the beginning of this year it rose to 6700 yuan/ton. At the end of April, the price reached 8000 yuan/ton, and the price was 10500 yuan/ton on June 18th. Tons, the price increased by more than 56% compared with the beginning of the year; until June 18, the prices of various auxiliary materials increased by more than 30% compared with the beginning of the year; the current price of raw and auxiliary materials compared with the average price of 2007, the comprehensive price increase rate exceeded 40%, which directly led to The cost of tire sales increased by more than 25%.
In 1915, Guangdong Brother Chuangchuang Rubber Co., Ltd. was established to produce rubber dental trays and rubber soles. It was the first rubber manufacturer in China.
In 1934, Shanghai Dazhonghua Rubber Factory began trial production of automobile tires based on the production of bicycle tires. First, it purchased equipment from Japan for trial production in Kobe. The next year, it was transferred back to China to formally establish a workshop and produced the first domestic automobile tire, named "Double Coin". The product has two specifications of 30×5 and 32×9, and the daily output is 7 to 9 pieces.
In 1951, the No. 1 State-owned Rubber Factory developed bullet-proof self-repairing tires and produced 600 tires for use by the Chinese People's Volunteers.
The 100th government meeting of the State Council passed the "Decision on Cultivating Rubber Trees". Rubber trees were planted in Guangdong, Guangxi, Yunnan and Fujian. The army and civilians began to work together in the cultivation and processing of natural rubber in Hainan.
In 1956, the 40th meeting of the Standing Committee of the First National People’s Congress decided to merge the former Chemical Industry Administration of the Ministry of Heavy Industry, the Pharmaceutical Industry Administration of the Ministry of Light Industry, and the Rubber Industry Administration to form the Ministry of Chemical Industry of the People’s Republic of China (hereinafter referred to as the Ministry of Chemical Industry). ), appointed Peng Tao as Minister of Chemical Industry.
In 1958, China's self-developed 2,000-ton/year chloroprene rubber production facility was completed and put into operation at the Changshou Chemical Plant, producing the first batch of synthetic rubber in China.
In 1960, the Lanzhou Synthetic Rubber Plant was completed and put into operation, producing the first batch of styrene butadiene rubber in China.
In 1964, Shanghai Dazhonghua Rubber Factory developed the first 9.00R20 all-steel radial tire in China.
After successfully trial-produced steel bias tires, Shanghai Dazhonghua Rubber Plant began to explore the development of all-steel radial tires. In the absence of information and ready-made equipment, the technicians used a photo of a radial tire building drum to design and trial-produce the radial tire building drum by themselves, while trial-manufacturing them, and constantly improving them. After many trials and improvements, China's first "Shuangqian" brand all-steel radial tire was finally successfully trial-produced.
In 1966, the National Science and Technology Commission, the Ministry of Petroleum, and the Ministry of Chemical Industry jointly organized the butadiene rubber technical research battle. With the Jinzhou Petroleum Sixth Plant as the main site, the company successfully developed butadiene as the raw material to produce butadiene rubber, and built 1,000 tons of butadiene per year. Industrial plant for rubber.
In 1982, Shanghai Chint Rubber Factory introduced a second-hand equipment production line with an annual output of 500,000 passenger radial tires from Metzler, Germany. With the strong support of Beijing Rubber Industry Research and Design Institute and other units, the "Pull back" brand car radial tires were successfully put into production and successfully passed the certification to supply the Santana car of the Shanghai Volkswagen Automobile Plant.
In 1985, the research and development results of the new technology of butadiene rubber production won the 1985 "Special Prize of National Science and Technology Progress Award".
In 1989, the Ministry of Chemical Industry issued the "Measures for the Implementation of the "Determination and Implementation of the State Council's Current Industrial Policy Points (Trial)" by the Ministry of Chemical Industry, proposing that the current internal chemical industry development sequence is the agricultural support chemical industry, the raw material chemical industry, the fine chemical industry, and the rubber processing industry. .
In 1993, the domestic large-scale domestic radial tire production line was completed and put into operation in Shandong Rongcheng Rubber Factory.
Henan Tire Factory's "Eighth Five-Year Plan" national key scientific and technological project "Large-scale Construction Machinery Tires" passed the national acceptance and started mass production, and the product quality reached the international advanced level.
In 1995, the Yanshan Petrochemical MTBE cracking polymerization-grade isobutylene production plant was completed and put into operation, which provided an economical and reliable source of raw materials for the production of butyl rubber; in December 1999, the 30,000-ton/year butyl rubber production plant introduced with Italian PI technology was completed and put into operation Since then, the situation that my country's butyl rubber is totally dependent on imports has ended.
In 1996, Yanshan Petrochemical built a 10,0
The State Administration of Cultural Heritage released the progress of the major project "Archaeological China". More than 500 important cultural relics such as golden mask fragments, giant bronze masks, bronze sacred trees, and ivory were unearthed in the six sacrificial pits newly discovered at the Sanxingdui site in Guanghan, Sichuan. During this excavation in Sanxingdui, 3D printing + silicone film coating was used for the first time in the extraction of cultural relics, which is a major innovation in the archaeological community.
In the new phase of the archaeological excavation work in Sanxingdui, "Black Technology" 3D printing technology uses a 3D scanner to collect cultural relics and their surrounding information and data, and then prints exactly the same plaster model through a 3D printer. The printed plaster model was used to make a tightly fitted and protective silicone protective cover. After the protective cover was attached to the cultural relics, the cultural relics were extracted using a box.
The 3D printing protective cover is better than the film and soft cloth, because it is sticky, it has the best protective effect on the big bronze statue.
According to experts, this is the first time that 3D printing technology has been used for the extraction of cultural relics in the domestic archaeology session, and it is an innovative way. Because the cultural relics of Sanxingdui have been buried underground for more than 3,000 years, the cultural relics are relatively fragile and will be damaged if you are not careful. And the same person extracted this time, plus the filling inside, weighs about 1,000 kilograms, and you need to be more careful when extracting it.
In the past, cultural relics were extracted by wrapping plastic films and soft cloths, while silica gel film can better fit the surface of cultural relics. Moreover, silica gel itself has a certain viscosity and can be better attached to the surface of cultural relics. Can provide better protection.
It is understood that from the statistics of the whole industry, in the first half of 2020, the rubber additives industry is in a difficult situation, especially the price of products has fallen severely; in the second half of the year, with the expansion of market demand, the overall operation has improved significantly, even in December. Operating at full load, the industry's overall efficiency rebounded rapidly.
Due to the low base last year, and the industry's production and sales situation in the first quarter of this year continued to increase at the end of last year, the increase was relatively large. The first quarterly report of Yanggu Huatai disclosed that in the first quarter, the company's orders were saturated, the production line was at full capacity, and its operating income was 589 million yuan, an increase of 44.30% year-on-year (the same below); the net profit attributable to shareholders of listed companies was 88.625 million yuan, an increase of 1719.56%. But in 2020, Yanggu Huatai's total operating income was 1.943 billion yuan, a decrease of 3.52%; the net profit attributable to shareholders of listed companies was 126 million yuan, a decrease of 31.77%. Therefore, from the data of listed companies, it is expected that the overall situation of the rubber additives industry this year will be better than that of the previous year.
According to statistics from the China Rubber Industry Association, from January to February, member companies achieved sales revenue of 3.635 billion yuan, an increase of 33.42%; the total output of rubber additives was 225,800 tons, an increase of 35.32%; the export delivery value increased by 46.51%, and the export rate (value ) 29.37%, an increase of 2.62 percentage points.
Relevant analysis believes that this year my country's economy will show a trend of "high in the front and low in the next, and down quarter by quarter". Therefore, rubber additives companies believe that the industry outlook will also tend to stabilize. At the same time, companies also reflect that under the situation of increasing market uncertainties and increasing risks, user companies should not always think of reducing the price of raw materials to obtain profits, but should ask for profits from the market, and they should cultivate suppliers and form strategic partnerships. , To achieve win-win development.
Recently, I found that many users know little about conveyor belts, and even less about the choice of conveyor belts. Now the editor will briefly talk about the selection techniques of conveyor belt specifications and models under different environmental conditions:
1. According to the size of the transportation volume, it is divided into common models according to the width: B500, B600, B650, B800, B1000, B1200, B1400, etc. (B stands for width, in millimeters). At present, the largest production capacity of Huaxia Rubber is B2700mm conveyor belt.
2. According to different use environments, it can be divided into ordinary rubber conveyor belts, heat-resistant rubber conveyor belts, cold-resistant rubber conveyor belts, acid and alkali resistant rubber conveyor belts, oil resistant rubber conveyor belts, flame retardant conveyor belts and other types (China Rubber Flame Retardant Conveyor The belt has passed the domestic coal safety certification and the U.S. coal safety certification at one time).
3. According to the tensile strength of the conveyor belt, it is divided into ordinary conveyor belt and powerful conveyor belt. For example: ordinary canvas conveyor belt, powerful canvas conveyor belt; ordinary steel cord conveyor belt, powerful steel cord conveyor belt. Powerful canvas conveyor belts are divided into nylon conveyor belts (NN conveyor belts) and polyester conveyor belts (EP conveyor belts); the current strong steel cord conveyor belts produced by Huaxia Rubber are based on ST-HHE light high-strength steel cord energy-saving conveyor belts. Mainly.
ST-HHE light-duty high-strength steel cord energy-saving conveyor belt is a high-strength steel cord conveyor belt independently developed by China Rubber. The application of ST-HHE technology and products is a technological revolution in the field of belt conveying. According to statistics, under the premise of ensuring all technical requirements such as transportation volume, service life, safety, etc., the ST-HHE belt conveyor system can reduce equipment investment by more than 30% compared with the traditional ST system; operation and maintenance costs can be reduced by more than 30%, of which The average value of electricity savings is over 26%.