Sewer maintenance program - blocking God blocking off the water

 Choose a reasonable repair method can effectively reduce project costs, shorten the construction period and reduce the negative impact on the environment , traffic . Various mechanic method has its own unique side, there are common basic points can learn from each other through . From that point, the classification of trenchless repair technology electrofusion coupling mould  induction, to further understanding and promotion of trenchless repair technology will be beneficial.
 A repair method of classification
 1, according to the useful life can be divided into temporary and long-term repair ( permanent ) repair ;
  2, according to construction methods can be divided into grouting , embedded reinforcing method , coating method, and lined pipe collars law method ;
 3, according to the repair site can be divided into point-like repair and overall repair two major categories ;
 4, according to the purpose of the repair can be divided into anti-leakage type , corrosion -and strengthen the structure type categories.
 Second, the repair methods
 By punctate repairs and repairs to the whole division, is a basic method sewer repair technology classification.
 1 , point-like many pipeline repair damage only occurs at the interface part of the pipeline , if only to repair the interface , which is called point-like repair (SpotRepair). Point into the interface embedded complement repair , grouting , collar law , local cured resin . Many damaged pipelines lives less than a decade , tube structure intact, but the interface leakage . For this type of pipeline repair using point is reasonable . Early point-like repair method is relatively simple, relying on staff access to repair leaks in the pipe directly , it can only be used over 800mm diameter pipes . ( 1 ) Interface embedded complement
 Interface is the application of the first embedded complement trenchless pipe repair technology , first fill material embedded in cement mortar , chiseled after the old joints, finishing with quick dry cement or asbestos cement expansion manually embedded complement . In recent years, chemical materials increased, tar epoxy mortar , polysulfide sealants , polyurethane vinegar began to replace cement mortar. Chemical  mould maker seal material has good flexibility , good resistance to deformation than the cement mortar.
Interface embedded complement although cheap , there is no impact on the flow cross-section , but poor quality stability . If staking cleaning is not clean, not dense embedded complement , these human factors can affect the reliability of the repair . In addition , the interface embedded complement duration is relatively long ( 2 ) grouting
 Through the tube and interface parts soil grouting , plugging groundwater seepage into the pipeline route is yet another point-like repair methods . According to different grouting materials can be divided into two types of cement grouting and chemical grouting ; according to setting mode grouting pipe can be divided into the tube ( outside ) drilling grouting and ground ( down ) two drilling grouting . Grouting from the ground down there is a big blind should not place more than note the note , the note of the ground ( such as the bottom part of the tube ) is difficult to inject enough .
In recent years, small pipe tube grouting technology has also made great progress. The airbag will be closed on both sides of the interface , and then injected into the joints of chemical pulp , chemical pulp curing water swelling soon after plugging leaks . And other engineering methods compared to the relatively poor reliability grouting . Therefore, its use in the United States and Japan are subject to certain restrictions , such as the requirement to conduct post- grouting visit every six months , or leakage should not use more than a certain amount and so on. Grouting is often used as an adjunct or temporary plugging method of application , generally can not use the law as an independent work . Grouting is usually embedded reinforcing method and interface combined effects of ( 3 ) sets of the Tour de France
 Mounting interface sealing collar portion is a common point repair methods . The vast majority of the Tour de France sets quality stability than the embedded reinforcing method is good, and fast construction speed , but the collar method has some influence on the flow. Collar method can be divided into the following categories:
 ① Antao ring scaffolds can be divided into : ordinary steel rings, stainless steel rings , PVC sleeve ring.
 ② Press the seal can be divided into : rubber water seals ( ribbon ) , rubber sealing rings ("O" type ) seals , PE water stop seal ( ribbon ) , polyurethane grouting . ③ by way of installation : can be divided into manual installation ( diameter 800mm and above) and airbags plastic injection mould  installed ( diameter 800mm or less ) .
Rings have been used :
 ① ordinary steel rings : steel rings into the 2-3 valve assembly in the tube , collar lined with rubber water in between the main pipe . Pipeline wrong port or interface injustice often affect the sealing effect , ordinary steel rings easily rust.
 4 ) partial curing resin
  The partial gelling is actually a method for repairing the whole point repair practice , there are two kinds :
  ① artificial fiberglass Interface : personnel into the tube , embedded interfaces do first up , and then in the interface area to do fiberglass liner.
 ② local forming felt tube airbags : filling resin coated tube with a balloon felt so close to the main pipe , and then heat cured with ultraviolet light and other methods . Felt barrel shaped balloon partially whole scene is actually a method of curing localized approach.
  2, the overall repair
  If a pipe repair from start to finish , this is called the overall repair (wholerpair). Overall repair is the entire pipe between two manholes reinforcement repair , this repair can be divided into two categories : one is the coating, and the other is the liner method. Coating method is suitable for the diameter of 800mm or more, anti-corrosion, anti-seepage pipes for the purpose of repair .
Liner can not only repair the pipeline corrosion, seepage and can increase the structural strength of the pipe . Liner construction method is fast , reliable , and therefore has become the mainstream of trenchless sewer repair . But the cost is correspondingly higher loss of some liner construction method is relatively large cross-section of the pipeline .
  ( 1 ) coating method (coating)
   Coating method to enhance the role of the structural strength does not only play a role in anti-corrosion and anti-seepage . Little impact on the pipeline coating method section , the relatively low prices, but long duration, reliability, poor quality , pipeline construction cleaning process , temperature, ventilation , personnel quality will affect the repair quality.

Three typical mold steel to become the market leader in the development of

It is well known in the industry, automobile manufacturing, large stamping equipment, mobile phones and other digital products, injection molding process, mold steel must be used, due to the new requirements to improve product safety and quality, but also quietly die steel  plastic injection mould in upgrading. Automobile mold steel into upgrading product quality to enhance the safety requirements phase, the current mold steel used in some companies can no longer meet the requirements of the new standards, mold steel into a replacement stage, such as automotive stamping companies, need to use better hardness and toughness of steel, while stamping prevent breakage and protect the hardness stampings. All involving injection molding, casting, stamping products, need to use tool steel, at present, due to the technical limitations of the domestic manufacturing industry, most high-quality steel mold needs to rely on foreign imports to fill the gap. Model replacement is tapping tee electrofusion mould  inevitable, because the needs of the community is always moving forward, consumer demand for quality, appearance and other requirements continue to increase, companies can only strive to increase research and development efforts to develop new products to meet the diverse requirements of the market.
Currently, there are three typical steel mold steel flame become the meat and potatoes on the market for sophisticated automotive mold manufacturing, to significantly enhance the quality of sophistication, a wide range of flame hardened steel, thermal sensitivity of small, widely used in various precision manufacturing. Its flexibility and stability, and not deformed. Compared with the precision and flexibility of these two die steel, tool steel is supposed to be economic, it made a pre-hardening process in the factory, due to the current high-end digital products selling, buying directly after processing, reduce heat treatment midway link, save the economic cost, high economic efficiency. Users how to choose mold steel
A typical three new die steel, strengths, the electrofusion coupling mould  user at the time of purchase, how to choose? The user selects when mold steel, mainly from the performance, use, quality, economic efficiency departure, manufacturing precision products, should take into account the long-term quality, it is recommended to buy flame steel, and some no specific accuracy requirements can Choose more good economic returns above three die steel mold steel, is a typical model after upgrading industrial materials, outlines three major areas of use, performance, quality, etc., so companies use to meet the needs of users according to their requirements , you can choose yourself.

Plastic mold development is inseparable from the project support

At present, China's consumption of plastic has been ranked first in the world, but per capita consumption is only 1/7 industrial countries, 1/4 Industrial moderately developed countries, this aspect of our existence reflects the gap, on the other hand demonstrated China's industrial and plastic mold industry a huge space for development of plastic. Development of the plastic mold industry must rely on national key construction projects, to develop precision plastic injection molds, mold coverage and large injection mold; simultaneously by accelerating corporate mergers and acquisitions and product upgrading, narrowing the distance between the countries, so  plastic coupler fittings mould that our plastic mold industry sustained and healthy development.
Arbitrariness of large plastic mold steel, carbon steel and 80% of 40Cr steel. For complex, precision molds, in order to avoid heat deformation, usually in annealing, normalizing state or quenched state processing used, so life is only similar foreign molds 1/10 to 1/2. Domestic automobile enterprises are willing to choose plastic mold Germany, Japan, Sweden, three series of die steel, but in the country to buy European steel mold, prices are often higher than the 30% to 40%, seriously affecting the competitiveness of domestic mold. Look at the precision molds, mold manufacturing and life cycle. Japan's auto mold accuracy up to 0.02mm, precision plastic mold parting controlled 0.01mm, while the domestic automobile molds brands, more than 25%, some 50% or more, many companies tend to be most enterprise workers interchangeable in technology and production jobs. Training of trainers and high-end CNC machine operation skills of domestic mold lack of high-tech enterprise employees processing technology, in a way that also affected the utilization of high-end equipment. Die low proportion of technical personnel of enterprises, most enterprises between 15% to 20%, and lower integrated development capability. Mold factory often and materials manufacturers, product manufacturers to develop; injection molding factory with material manufacturers will jointly  pipe reducing coupling mould develop new models; brand plastic vendors and brand car companies jointly developed a new plastic and steel products. Such strong cooperation, so that enterprises have a strong R & D capability. Chinese enterprises in innovation, greater R & D capability gaps. "Luo Hui pointed out that China plastic mold industry in the current and future development, to work closely with key project of the steel, automobile, petrochemical, shipbuilding, light industry, textile, nonferrous metals, electronic information, these nine national defense industries, to enhance large mold, precision injection molds, high-grade standard mold manufacturing capacity; achieve localization tool steel and high quality, improving mold material supply system  injection mould to provide a more comprehensive variety of sizes and grades of material, and greatly reduce mold manufacturing enterprises preparation period; improve mold new materials, new technology and new plastic molding, high strength, high toughness, high temperature plastics research and development capabilities; improve the overall level of enterprise information management and integrated manufacturing mold.

Our mold companies can enhance the prospects of future innovation

Mold has "the mother of industry," said the foundation technology and equipment belonging to the industrial production. Today, the development of China's mold industry has formed a unique mold industry cluster production base for mold companies provide a platform for scientific development. Meanwhile, the innovation capacity of enterprises is also rising, with a number of independent intellectual property rights, the future of China's mold companies will have a stronger competitive.
Nearly a decade, China's automobile industry has made considerable progress. At present, China's mold industry output value  Bridge Bend mould of over $ 100 billion industry, one of the main application as a mold downstream automotive industry, China is about 1/3 of the mold products for the automotive service industry.
China mold industry after decades of accumulated technology and in recent years to increase international exchanges, pay close attention to technological innovation in production technology have achieved significant breakthroughs in business with more competitive, the industry expects 2015 sales value of China's mold will reach 350 billion yuan. Although in recent years the domestic mold exports increasing level of international competitiveness has improved. But mostly concentrated on middle and low areas, low mold technical level, low value-added, high-precision molds also part dependent on imports, so the domestic mold industry in various fields to strengthen integration.
Throughout the development process, related industries and businesses need long-term perspective, the potential lower mind, pay close attention to new technologies, new technology research side, and gradually form a division of labor, there is collaboration in all areas of research and development pattern, introduced with proprietary mold products. Now China's mold industry through the introduction of foreign capital, absorb the advanced experience of foreign mold manufacturing, advanced technology and high-level talents, our mold design and manufacturing level has been greatly improved.
"With the increasing domestic demand in China can be expected to die by 2013 China will have a larger growth industry, especially the automotive industry, has led to the rapid development of tapping tee electrofusion mould  China's mold industry, promote the rapid transformation and upgrading of mold enterprise." Luo Baihui mold experts believe, strengthen independent innovation in the industry change the growth mode, optimize the industrial structure, have a greater need high levels of mold machinery and equipment, providing a broad development space for the development of mold industry. More importantly, "five" the implementation of development policies and emerging strategic industries, regional development planning and policy to revitalize the equipment manufacturing industry will die industries are providing new growth point. With manufacturing in developed countries have to transfer to China, China's mold industry is facing a new round of development opportunities. Forecasts, and electrofusion coupling mould  the internal and external drives Qi moving environment, to 2015, China's mold will reach 350 billion yuan sales value. China's mold industry is currently experiencing competitive pressures are mainly price advantage and technological superiority of developed countries to developing countries, need to know not only the development and progress of industrial molds China, Southeast Asia and Eastern European countries in recent years, the development of industrial molds are very fast, its advantages in terms of mold price Obviously, this weakens the cost and price advantage of China's mold industry has always been a certain extent. In addition, Western Europe, Japan and South Korea on the strength of the high-end market, but also to mold China mold industry is facing enormous challenges.

Auto Mould is an inevitable trend of high-end enterprise development

Last year , according to media statistics , China's mold of key enterprises reached nearly 110 , which accounts for about 37% of stamping dies , these data demonstrated a strong automotive mold manufacturing country , China has become a fact . However, the development of China's automotive die but not so ideal , high-end automotive mold enterprise technology is not up to the level of technological innovation capability , inadequate new mold R & D capabilities , etc. The reason for this series are restricting the development of China's automobile mold industry leading automobile companies can not produce molds and dies to match the high-end market , high-end car manufacturers need to mold must also rely on imports. The domestic high-end  Male/ Female Tee mould enterprise occasionally die because of lack of production load , had to change the initial market positioning away seize , the low-end market . Although the survival of the enterprise to solve the problem , but because of the low-end market, low profit margins , leading to invest R & D and technological innovation rarely , under certain circumstances, a vicious cycle in which companies did not enter a virtuous cycle of development , the domestic mold companies are more high-end cars , making it faces increasingly fierce competition in the market . Experts said that the domestic high-end automotive mold companies in addition to the traditional mold of enterprises to meet Q ( quality ), C ( cost ), T ( period ) requirements, mold development and application of new technologies will become the focus of future development of China 's mold industry direction .
Multi-position progressive die and precision die represents the development direction of stamping dies , precision  Bridge Bend mould and demanding life , mainly for the electronic information industry , automotive , instrumentation , electrical appliances and other facilities. Both mold , the country has fairly basic , and has the introduction of foreign technology and equipment, the products of individual enterprises has reached the world level, but most companies are still a large gap , the total is also in short supply , import more . For ultra large scale integrated circuit package for more than 100 and a lead foot gap 0.2mm below the lead frame package for the accuracy of 5mm or more matching precision miniature connector for 1.6mm below the core support and micro-motors for the CRT electron gun tapping tee electrofusion mould  and supporting the development of precision molds is a top priority .
Our high-end line of automotive die mold enterprise is the only way to development , market demand and also contributed to the development of other large and medium-sized stamping supporting multi-position progressive die should also focus on the development .

Keep up the pace of plastic mold market prospects

In recent years, with the rapid development of electronic information industry and information technology transformation , the prospect of a vast plastic mold market , the world's high-grade , precision plastic mold market is in short supply situation of traditional industries.
The weight of a single set of plastic mold manufacturing level has been greatly improved, the production of  Coupler mould large plastic mold has reached more than 50t , the accuracy of precision plastic mold has reached 3cm, multi-cavity plastic molds capable of producing plastic mold cavity of a mold 7800 , high-speed extrusion molds capable of producing more than the speed of high-speed 4m/min plastic profile extrusion dies and coextrusion die lumen main sections . With the continuous improvement of the rapid development of the plastics industry and general engineering plastics in terms of intensity , scope of application of plastic products is also expanding , the amount of plastic products is on the rise . It is understood that China 's output of plastic products in 2012 nearly 60 million tons , and continues to  tapping tee electrofusion mould grow process, we can see that domestic demand for China's plastic mold industry has a huge impetus.
In recent years, according to the International Association of mold , the mold industry associations to actively encourage member companies to update technology and equipment , to promote the technology and product innovation , and guide qualified enterprises from production processes to develop , expand sales of high value-added mold , injection mold manufacturing have a new large-scale expansion. Regional and national distribution of plastic processing industry is similar to the Pearl River Delta , Yangtze River  Delta plastics processing industry forefront , Zhejiang, Jiangsu and Guangdong, the  Shorter Pipe Clip proportion of the national output of plastic mold mold output value also accounted for 70 %. With the Chinese automotive, appliance, electronic communications , the rapid development of various building materials, is expected to die in the future market, accounting for the total amount of plastic mold will gradually increase the proportion of mold , and the growth rate will be faster than other mold.

Mold industry based high-tech park

Recently in Jimei Guankou machinery industrial or automotive industry Jimei district planning and construction of the mold processing zone , covers an area of ​​1,000,000 square meters ; construction area of ​​700,000 square meters , accommodating 200 mold manufacturing enterprises. First attracted 3050 has a certain scale , technologically advanced  plastic coupler fittings mould enterprises stationed , and then attract domestic and foreign investment by way of sophisticated , complex, long life, large mold manufacturing companies settled. After the completion of mold processing area , to form a mold manufacturing as the main set mold material supply, manufacturing supply accessories , professional processing technology, research and development, information exchange, training of high-tech  2 inch pvc coupling mould industrial park. Park to highlight the professional collaboration support, through social division of labor to improve the efficiency and professionalism , thus improving the overall level of mold manufacturing , efficiency and competitiveness.
Mold industry development , its social benefits far outweigh their benefits. Accelerate the development of modern mold industry , help to improve the international competitiveness of the manufacturing sector , is conducive to the expansion of exports and investment . Government departments should improve the mold leader in pioneering role in the industrialization of knowledge , improve government service functions , multi-faceted , multi-channel support and publicize relevant preferential policies for the mold industry , the best use of the existing preferential policies injection mould  typical corporate mold industry comprehensive support to break through the  bottleneck , enhance development.
Mold industry to private small and medium enterprises mostly belong to the development of enterprises, the difficulties in terms of capital of listed companies , the proposed local government tax of 40% will be divided into parts returned to the business , and appropriate in urban construction tax, education expenses , all funds relief care. There are some difficulties for the operation of the temporary mold companies , upon application and approval may be given 1-2 years of income tax relief . High-tech industries for mold companies identify , to meet the high-tech companies to give tax breaks for two years to take care of .

Computer graphics board used in mold design related content

Its powerful search functions as mechanical system design and technology provides an important auxiliary tool, greatly reducing their calculations. CAXA2000 unique system query functions including point coordinates, distance between two points and angles, element attributes and perimeter, area and center of gravity inquiries, moment of inertia, query system status and so on. These systems query capabilities specific to the mold design  hdpe couplers mould and manufacturing, CAXA2000 technicians ready to die, they have become an indispensable assistant with CAXA pressure center in solving Die Die, the pressure force of the punch, said the point of center of pressure for the mold. Die pressure center should coincide with the axis of the press slide, the slider from the eccentric load impact. Otherwise, it will accelerate the wear of the slider and the guide portion of the mold, which affects the quality of stamping parts, reduce die life. The method for solving the current mold pressure center is generally used analytical method or graphical method. When analytical method to calculate the workload, error-prone, and plotted graphically on the level designers demanding, but it is difficult to ensure accuracy. Stamping parts in the calculation of the center of pressure, according to the punching force calculation formula: F = LtS where F blanking force ridgeline length L t workpiece thickness S punching shear strength of the workpiece material effect on the punching force evenly the role of the center line, so that the center of gravity of the workpiece blanking force contours. If solving the analytical method, the first look-up table to get the coordinates of the center of gravity of each segment is calculated by solving the above center coordinates calculated tedious, error-prone, in fact, we can directly apply CAXA focus the inquiry, obtain  plastic coupler fittings mould the coordinates of the center of gravity values. The steps are as follows: a pro-rata basis to draw the workpiece shape (marked decimals and decimals inquiry, drawing decimals are set to 4); marked by setting the number of (set display decimal places); according to system configuration settings (to set the query decimal places. ). b. for workpiece contour equidistance line (to improve accuracy, the distance can be set equidistant 0.01) and move the coordinate origin O points. Press Setup, select the user coordinate - the origin, intelligent capture point O points, left the pickup, press Enter. c. original contour line layer to hide, with the focus of the inquiry found CAXA focus of two equidistant lines surround the area into strips. Focus query method:
. a with the mouse in the "Query> drop-down menu, select <center> Options b in the drawing area immediately below the screen menus and operation prompt, select the ring point (Note: Immediately menu <increase ring> is the pickup closed region and other regions to accumulate, "Reducing the ring> refers to the enclosed area is subtracted from other regions). c. Right-click the query results show the coordinates of the center of gravity. After testing, equidistant from the center of gravity coordinates 0.1, the query was obtained as Q (51.715,27.466), equidistant from 0.01 when the query to get the coordinates of the center of gravity for the Q (51.624,27.123), apparently taken equidistant from 0.01 to get The coordinates of the plastic mould  center of gravity to fully meet the requirements of precision mold design. Rough calculation of the size of the drawing parts drawing in non-thinning, excluding material thickness changes. Usually by the surface area of ​​the product plus repair parts of the surface area of ​​the side margin. In other words, with the front and rear deformation principle for calculating the surface area equal parts drawing wool size. To determine pre-drawing sheet size, we must first calculate the gross area of ​​the workpiece.

Situation Analysis of Chinese mold large industrial standardization system

Where the more developed industrial countries , more emphasis on standardization work , because to give industry brings quality, efficiency and effectiveness. Mold is a special forming tool products, although strong individual , but also industrial products , so standardization is very important. Die Die standardization work includes the development Plastic Ball Valve mould  and implementation of technical standards , production and application of the standard mold and the relevant standards advocacy, implementation and promotion. China mold standardization work started late , combined with publicity and promotion efforts to implement small, so the mold behind the standardization of production , but also behind many industrialized countries in the world . Foreign mold developed countries, such as Japan , USA, Germany, mold standardization nearly 100 years of history, production and supply of standard-setting mold , mold standard parts , has formed a complete system . Guarantee of the Chinese die from work just after the establishment of the National Standardization Technical Committee of the mold began in 1983 . At present, China has about 20,000 units of production molds , mold production has made significant progress , but compared with the industrial production requirements , yet could not get one of the important reasons is that the mold and the level is not high degree of standardization .
China mold standardization system , including standard four categories , namely: basic standard mold , mold process quality standards , mold and die parts production-related standards and technical standards . Mold standard and can be mainly categorized stamping die mold standards, standard plastic injection mold , die casting mold standards, forging mold standard , standard fasteners cold heading die , drawing die standard , cold extrusion dies standards, standard rubber molds , glass molds and automotive die standards ten categories . Currently, China has more than 50 standard mold of electrofusion coupling mould  over 300 standard No. 14 kinds of common devices and automotive parts and components die and 244 varieties of 363 standards. These standards development and advocacy to implement and improve the standardization of Chinese mold and level. With the increase in international exchanges , the development of the localization of imported mold -funded enterprises as well as its supporting mold made ​​international standardization requirements , on the one hand in terms of attention to a possible standard-setting international standards or advanced foreign adoption of national standards , including the adoption of advanced corporate standards ; hand many standard mold manufacturing enterprises according to market needs , in addition to standard production outside China mold standard parts , as well as advanced enterprise standard production standard mold . Rich Teba such as Japan , Germany and other companies Haas test standards have been widely popular in China .
Die mold industry standardization concept often referred to more complex, different from the usual level of mechanical industry standardization . The latter generally can be measured by using the standard rate, while the former often refers to the use of standard mold coverage . As the Chinese would not die standardization work late , mold standard parts production, marketing, promotion and application of the work is relatively backward , so the standard mold fewer varieties of specifications, supply is not timely, complete and poor long-standing problem , so that the standard mold use the coverage has been low . Although this year due to foreign intervention , the ratio has been greatly improved , but overall still very low. According to preliminary estimates , at present it was fairly easy to between 40% -45 %. The international community generally above 70 %, of which more than 80% of small molds . Due to the different nature and areas where the Chinese mold companies , there is a big difference in the use of standard mold coverage . Funded enterprises than any other enterprise high , the South than in the North High enterprises . This is most obvious in Guangdong . Guangdong, a  pipe elbows and bends mould large concentration of foreign-funded enterprises , they led to the transformation and development of other business concepts of the market, thus Guangdong mold companies use standard mold coverage is much higher than in other regions of the mold companies . Implementing the standard mold , using the standard mold , the mold can not only improve the quality and reduce production costs and shorten mold mold production cycle. Relevant statistics show that: the standard mold tooling companies can save 25% -45 % of working hours , mold production cycle can be shortened by 30% -40 %. As industrial product variety, low-volume, personalized, fast development of the production cycle , in order to improve the market economy rapid response capabilities and competitiveness in the mold production cycle are increasingly important in today's standardized meaning more die significant .