Piston Seals and Rod Seals are important seals used in mechanical equipment. Their main function is to prevent liquid and gas leaks and ensure the normal operation of mechanical equipment. Piston seals and rod seals are usually used in hydraulic and Pressure system, such as hydraulic cylinders and Pneumatic cylinder. The quality and performance of these seals directly affect the efficiency and lifespan of mechanical equipment.
The classification of piston seals and rod seals is mainly based on their material and design structure. According to the different materials, they can be divided into rubber seals, polyurethane seals, polytetrafluoroethylene seals, metal seals, etc. According to the different design structures, they can be divided into unidirectional seals, bidirectional seals, rotary seals, etc.
Rubber seals are a common type of seal, and their main material is rubber. Rubber seals have good sealing performance and wear resistance, and are suitable for medium and low pressure hydraulic systems and Pressure system. Polyurethane sealing element is a high-performance sealing element, and its main material is polyurethane. Polyurethane seals have high wear resistance, high temperature performance and high pressure performance, and are suitable for high-pressure hydraulic systems and Pressure system. PTFE sealing element is a corrosion-resistant sealing element, and its main material is PTFE. PTFE seals have excellent corrosion resistance and high temperature resistance, making them suitable for fields such as chemical and food processing. Metal seals are a type of high-temperature and high-pressure seal, mainly made of metal. Metal seals have high temperature and high pressure performance and corrosion resistance, and are suitable for high temperature and high pressure hydraulic systems and Pressure system.
Unidirectional seals and bidirectional seals are classified based on different sealing directions. A unidirectional seal can only prevent the leakage of liquid or gas from one direction, while a bidirectional seal can prevent the leakage of liquid or gas from both directions. Rotating seal is a type of seal that can rotate and is mainly used for sealing rotating shafts. Rotary seals are divided into unidirectional rotary seals and bidirectional rotary seals.
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The home prosperity index fell sharply last month but the warm winter trend remained unchanged.
After the building materials home boom index (BHI) jumped to the highest point of the year in October, BHI in November came to a "big diving." Recently, the Department of Circulation Industry Development of the Ministry of Commerce and the China Building Materials Circulation Association jointly released the November BHI index of 114.31, a decrease of 8.91 points from the previous month. However, although the home prosperity index is declining, the industry generally believes that this year's building materials and home furnishing industry is a "warm winter" compared with last year. The main reason for the decrease in the chain is that after the off-season, after entering November, the weather is getting colder, especially for construction such as paint. The home market has entered the traditional market off-season. “Seasonal factors are the main reason for the sharp decline in the home prosperity index.†Mr. Gu, a person in charge of the decoration company, said that after entering November, the customers who came to the door were about one-third of the normal period, such as a normal period. There are twenty or thirty customers in the month, and there are only seven or eight in November. In the number of starts, there were eighty or ninety in the first month, and now there are four or fifty. Another reason for the decline in the BHI index is the impact of the real estate market. As a downstream industry in the real estate market, the building materials and home furnishing market is subject to fluctuations in the housing market. According to the National Bureau of Statistics, in November, the real estate development climate index (referred to as the “national housing boom indexâ€) was 96.38, down 0.5 points from the previous month. "In addition to the seasonal influence, the property market has begun to gradually decline in the context of the increasing over-regulation of real estate in various places. The building materials and home furnishing market is affected by it. The decline of BHI is reasonable." Executive Vice President of China Building Materials Circulation Association Qin Occupy the doctrine. The year-on-year rise and release of the warm-up signal, however, the reporter also noted that although BHI fell by 8.91 points in November, the index still reached 114.31, which is a medium-high level operation, especially compared with November last year, an increase of 4.17 points. In this regard, Qin Zhanxue and many home industry professionals in Nanjing have analyzed that this is a positive signal from the industry's recovery. "From this year's home prosperity index table, the index in November is second only to the three months of October, September and August, which is higher than the index value of the decoration season in May." Nanjing Decoration Materials Trade Association Secretary-General Qu Zhi said that from the second half of this year, the building materials and home furnishing market has been improving, the market has fully recovered, and many home building materials brands have completed their annual sales tasks early. “Even after the completion of the sales task, the home building materials market still has a lot of promotional activities in November, and the popularity of each event is still very high.†This is an important factor for professionals to think that this year is a warm winter. For example, the decoration readers' festival hosted by Jinling Evening News in November attracted thousands of people to come to purchase; Jinhua and several other decoration companies held a multi-year decoration collection event, each event can attract hundreds of families to participate, and so on. The sales target of the store is still almost the same. In addition, the China Building Materials Circulation Association also announced the sales of the first 11 months of the national building materials store. The cumulative sales from January to November was 1,140.7 billion yuan, down 0.47 year-on-year. %. It can also be seen from this data that this year's sales of home furnishing stores are still missing, and the end of the year has become the last sprint opportunity for some home stores. The reporter learned that many stores in this time period are opening warehouses. Some of the inventory for the whole year will be released in the form of a “limited editionâ€, and the discount will occasionally be less than 50% off. "So this time can be regarded as the bottom of the end of the year, the specials are particularly large, and mostly based on small pieces of furniture, soft clothing." A store staff said, "there will be a small climax of such products at the end of this year." The participation of the network has become a highlight of the home market promotion at the end of this year, and it has also become the driving force for the decorators to purchase and decorate in the off-season. The reporter learned that home stores and decoration companies such as Red Star and Yuexing will interact with consumers through various online media such as Weibo and WeChat. In the decoration company, the face-to-face decoration was even renamed as “No. 1 Homeâ€, and the transformation was done in the home improvement O2O mode. Noun explanation: BHI is the abbreviation of National Building Materials Home Furnishing Index. It is a boom index of a building materials and home terminal store jointly issued by the Circulation Industry Development Department of the Ministry of Commerce and the China Building Materials Circulation Association. It is compiled from relevant data collected from 40,000 building materials and home merchants (shops) from designated collection points in the country. BHI reflects the prosperity and market trend of building materials and home decoration materials. At the same time, compared with the national real estate development climate index, it can also reflect the strength of rigid demand in real estate.