After 160 years of development, the rubber industry has become the world an important traditional industries, processing technology and technical equipment of its maturity and perfection. Present in rubber production, rubber mixing and curing the two systems to focus on all kinds of rubber products according to the structure and characteristics of the formation of a processing (rolling, extrusion), secondary processing (molding) and three processing (after treatment) and other forms of processing technology (see Table 1), rubber plant commonly used rubber processing equipment, mainly large-scale units and automated production lines up to more than ten.
In accordance with the different rubber processing, rubber machinery and equipment variety. From large to 100 tons or more units to less than 100 kg weight of small micro-machinery, rubber constituted the great span of mechanical equipment system. Currently, manufacturers of rubber machinery and equipment is extremely messy. Mixer, rolling machines and other heavy equipment of the production concentrated in the large oak Depot or cross-industry machinery plant, most other equipment are scattered in many small and medium enterprises, blossom everywhere. Because a considerable portion of these devices are common rubber factory and plastic factory, and therefore the output of rubber special equipment is difficult to date the exact statistics. Now, the world's rubber machinery and equipment with annual sales estimated at 20 to 25 billion, with production of the rubber industry or the economy fluctuations.
Currently, new rubber machinery products that are targeted specifically to the requirements of rubber processing research and development. The general trend is:
1, rubber processing equipment to the electrical and mechanical aspects of the integration of the development of microelectronics applications are increasingly common, so replacing the rubber production technology completely rely on the experience of workers that the traditional model, and thus to improve the safety and health conditions for the purpose;
Second, the overall processing equipment to the crew of the device in the direction of development, linkage and systematic and has continuously improved, so that the production line into full play the potential effectiveness of stand-alone, the provincial human effort to improve production efficiency;
3, rubber production lines to high-function, multi-purpose and flexible in the direction and development to adapt to small quantity and variety of flexible technology and small device to mold rubber machinery and equipment for the center design.
In the rubber industry in the production process equipment, mixing and subsequent processing of a three part process and equipment is mainly common type, secondary processing and curing process of the equipment essentially special type. In addition to the shape of rubber equipment, there are many rubber products to meet specific production requirements and equipment designed for use with non-stereotyped, the large number of different purposes, it is difficult to make out. Here, the key to General Motors, setting equipment mainly from the perspective of processing technology, simple equipment peep about the leading technology development status and future trends
Mixing process set name
Rubber plant rubber mixing process mainly open and closed two major types of mixing equipment. Rubber mixing mill is the first use of the equipment and the most widely used general-purpose equipment. From 1820 for rubber processing and structural principles of continuity throughout the ages has widely used in rubber, plastics refining, mixing, a film and thermal refining and other processes. Rubber industry as a landmark device, and was once glorious years. However, because of its low productivity, labor intensive and difficult to solve the problem of dust pollution, shrinking its use in plastic mixing has basically been eliminated in the state. At present, the mixer is a modern rubber plant rubber mixing process leading equipment, its production capacity ranging from 30 to 600L. Rotation speed from 20 to 60 turn, or even free to speed, has reached more than ten kinds of models as much. Mixing machine and mixer performance comparisons, see Table 3.
Today, consumption of large rubber tires and tubing plants and other factories have been fixed discharge for a fully enclosed mixer, capacity and more for the 160 ~ 270L, a large tire factory for the 270 ~ 370L, and some to 620L, and the with automatic weighing and conveying system with, the attached screw pressed, and cut off the continuous cooling device, across the board form a complete mixing unit. The unit has achieved automation and linkage of B, 1 to 2 people with a computer can control the entire operation of the system.
Such a large mixer is moving from single-speed, two-speed to variable speed, from asynchronous to synchronous rotor rotor, from conventional power to the power and space from the fixed to the adjustable gap direction. Thus temperature control, time control, energy control and plastic flow control to ensure performance of the mixed rubber to uniform requirements. There are special requirements for rubber mixing, in addition to the existing use of the shear type, meshing rotor but also emerging a cylindrical adjustable rotor, confined mixing chamber, the vacuum mixing nitrogen. Thus, mixer's mixing function more diversified, so that it can fully replace the mixing mill. Recent trend is vigorously researching and developing intelligent mixer, and the emergence of high-tech fully automated continuous mixing.
For many types of glue, glue a small amount of consumption of industrial rubber products factory, most are from the traditional use of open mill mixing, turning to tumble mixer. The device also known as compression type to marker mixer, a production capacity of small to 5L, ranging from large to 110L. As simple and easy to clean material change has been largely replaced open mill mixing into the mainstream of development is very rapid. The original opening to the main mixing mill, now mostly as a flip-style mixer additional mixing, relegated to secondary status. Most Jieke rubber flip-type mixer mixing of dual-use plastic, it is suitable for both industrial rubber products factory producing rubber products, but also the status of processing of plastic products, saving investment, flexible. In order to achieve the same effect as open mill, recently appeared in better cooling performance flip-type mixer, can be 80 ~ 100oC temperatures below the low-temperature mixing. This would enable the mother mixing and kneading in the machine at once, shortening the rubber mixing time.
Currently, special rubber products factory, the mill is still open after all the major rubber mixing equipment, convenient operation, you can use of a machine. In the mixing process can also fully observed in mixed circumstances. In order to improve the quality of mixing mill mixing, in recent years has made a series of improvement and perfection. For example, in setting around the roll surface temperature measurement software, to enable continuous measurement and adjustment of roll temperature; pressure sensor in the post-roll settings, can be determined between two rubber rollers the pressure, the plane can also be added automatically inverted plastic and feeding devices and so on. Making it easier to open mill operations, further improve the mixing quality and mixing process to achieve modernization.
Continuous mixing is the dream of rubber industry for many years. However, due to a variety of rubber powder blends viscoelasticity and the complex conditions of constraint, despite long use of granulation, various means of improving the anti-powder still has to do as intended. Over the years, with the emergence of thermoplastic elastomer, and its range of industrial rubber products used in the rapid expansion of research and development of continuous mixing become active again. Currently, single screw and twin-screw mixing machine has been successfully used to fill small thermoplastic rubber mixing process at the same time, in the rubber mixing has also made encouraging progress. Continuous mixing will eventually become possible to use the new century, rubber mixing method. |
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