Industry news_News_Nanjing Haoxiang Machinery Manufacturing Co, Ltd

08-28 

Reasons for the decline in demand for rubber machinery in China

China's tire meridian rate is over 89 percent, far below the world average. Past investment in tires has been driven by demand for both tires and radial tires, which can only be supported by demand fo

08-28 

What is the difference between the operation of the rubber mixer

Rubber mixer is a kind of rubber machinery, mainly used in rubber refining and mixing. The rubber mixer generally consists of a mixing chamber, two rotors with relative rotation, upper and lower pins,

08-28 

The European Union implements the safety standardization of rubber machinery

At present, the safety standard of rubber and plastics machinery in China mostly adopts the EN standard of Europe. The European committee for standardization (CEN) is the main provider of European sta

08-28 

Technical improvement of rubber machinery enterprises to help save energy and reduce emissions

Recently, the continuous haze in many places across the country makes people sigh that "even breathing is painful". This "understanding" also makes the concept of green energy conservation more and more in-depth in people's concept. Many plastic machinery enterprises regard controlling and saving costs as the primary task. At present, most plastic machinery have realized energy-saving transformation. At present, the servo energy-saving technology has been successfully applied to the injection molding machine, which can save up to 80% more energy than the ordinary quantitative pump injection molding machine and 50% more energy than the variable pump. At the same time, it can improve the production efficiency by more than 10%. The editor learned that the injection molding machine manufacturers have begun mass production and will quickly become the mainstream products at home. Energy saving technology is improving Through the research and development of scientific researchers, Electromagnetic heating (IH technology is a new type of high-frequency heating technology. It produces energy-saving and environment-friendly high-frequency heating system, and the heating efficiency is increased to 90% up to 99.8%. According to the installation and testing in various plastic processing enterprises, the energy-saving and environment-friendly high-frequency heating system has a very obvious energy-saving effect for plastic processing enterprises, saving electricity by 30% - 70%. It fully reflects its energy-saving advantages, saves a lot of electricity costs for plastic processing enterprises, improves production efficiency and improves the environment of the workshop, So as to directly reduce the indirect production cost. Then convert the DC power into high-frequency high-voltage power with a frequency of 20-40khz. The electromagnetic heating equipment is specially made of high-temperature resistant cable. The electromagnetic heating economizer is a device that uses the principle of electromagnetic induction to convert electric energy into electromagnetic energy for heating. The electromagnetic heating economizer rectifies 220V50 / 60Hz AC into DC. The high-frequency high-voltage current with high-speed change will produce an alternating magnetic field with high-speed change through the coil. When the magnetic force line in the magnetic field passes through the magnetic conductive metal material, countless small eddy currents will be generated in the metal body, making the metal material itself heat at high speed, so as to achieve the ideal heating effect. It can also improve quality and working conditions. Servo injection molding machine can not only save resources and reduce costs. However, in the cost composition of injection molding products, electricity accounts for a considerable proportion. According to the needs of injection molding machine equipment and technology, the power consumption of traditional injection molding machine oil pump motor accounts for 80% - 90% of the power consumption of the whole equipment

08-28 

Brief description of daily maintenance of twin screw extruder

In recent years, foreign twin-screw extruders have developed greatly. Various forms of twin-screw extruders have been serialized and commercialized, and there are many manufacturers. They are roughly classified as follows: (1) According to the relative position of the two axes, there are parallel and conical; (2) According to the meshing procedure of two screws, there are meshing type and non meshing type; (3) According to the rotation direction of the two screws, there are the same direction and different direction, and there are inward and outward in the different direction; (4) According to the screw rotation speed, there are high speed and low speed; (5) According to the structure of screw and barrel, it can be divided into whole and combination. For example, it is easier for some manufacturers to develop twin-screw extruders on the basis of planetary extruders, which have poor thermal stability Daily maintenance method of twin screw extruder: 1、 After 500 hours of use, there will be iron filings or other impurities from gear grinding in the reducer. Therefore, clean the gear and replace the lubricating oil of the reducer at the same time. 2、 After a period of use, conduct a comprehensive inspection of the extruder to check the tightness of all screws. 3、 In case of sudden power failure during production, the main drive and heating stop. When the power supply is restored, each section of the barrel must be reheated to the specified temperature and kept warm for a period of time before starting the extruder. 4、 If the steering fullness of the instrument and pointer is found, check whether the contact of the equilateral line of the thermocouple is good.

08-28 

What are the differences between twin-screw extruder and single screw extruder?

Double screw extruder Two conical screws are arranged horizontally, and the two axes are installed into the barrel at an included angle. The center distance of the two axes gradually increases from the small end to the large end, so that there is a large center distance between the two output shafts of the transmission gearbox. There is a large installation space for the gears and gear shafts in these transmission systems and the radial bearings and thrust bearings supporting these gear shafts. It can install radial bearings and thrust bearings of larger specifications, Each transmission shaft has a shaft diameter sufficient to meet the transmission torque, so large working torque and large load-bearing capacity are a major feature of conical twin-screw extruder. This parallel twin-screw extruder is incomparable. Non return bearing of twin screw extruder When the twin-screw extruder works, the melt will produce a very large pressure (head pressure) at the head of the screw. The pressure is usually about 14MPa, sometimes even more than 30MPa. This pressure forms a strong axial thrust on the screw. The thrust is the function of the stop bearing. Characteristics of twin screw extruder 1. According to the relative position of the two axes, there are parallel and conical; 2. According to the meshing procedure of two screws, there are meshing type and non meshing type; 3. According to the rotation direction of the two screws, there are the same direction and different direction, and there are inward and outward in the different direction; 4. According to the screw rotation speed, there are high speed and low speed; 5. According to the structure of screw and barrel, it can be divided into whole and combination The effective length of single screw extruder is generally divided into three sections. The effective length of the three sections is determined according to the screw diameter, pitch and depth, which is generally divided according to one-third of each. Characteristics of single screw extruder 1. The material transportation of Single Screw Extruder mainly depends on friction, which limits the feeding performance of single screw extruder, and it is difficult to add powder, paste, glass fiber and inorganic filler. 2. Single screw extruder exhaust extruder has little effect on the surface renewal of materials in the exhaust area, so the exhaust effect of single screw extruder is poor. 3. Single screw extruder is not suitable for some technological processes, such as polymer coloring, thermosetting powder processing and so on. 4. When the head pressure of single screw extruder is high, the countercurrent increases and the productivity of single screw extruder decreases.

08-28 

Factors affecting the performance of twin screw extruder

Experts from twin-screw extruder service providers said that in recent years, with the continuous development of polymer modified materials, its requirements for mixing equipment are becoming higher and higher. At present, according to the development trend at home and abroad, the co rotating parallel twin-screw extruder is mainly developed in the aspects of high speed, high torque, large extrusion capacity and low energy consumption. The split co directional parallel twin-screw extruder is a high-speed and high torque extruder that can quickly open the barrel for material cleaning. Experts from twin-screw extruder service providers said that the remarkable feature of the parallel twin-screw extruder in the same direction is that the barrel can be divided, and the screw and the bushing in the barrel can be combined at will. 1. Drum splitter. In the past, the barrel of the same direction parallel twin-screw extruder was integral and could not be opened. The split parallel twin-screw extruder in the same direction is a split type, which is composed of upper and lower half barrels, the lower half barrel is fixed on the frame, and the upper half barrel is connected to the lower half barrel through worm gear reducer. At ordinary times, the upper half of the barrel and the lower half of the barrel are bolted tightly with two rows of bolts. When it is necessary to open the barrel, just loosen the bolts and turn the handle of the worm gear box to open the barrel. 2. Block screw and barrel. The screw and barrel of the main machine of the split co directional parallel twin-screw extruder adopt advanced "building block" design. The screw is composed of various forms of screw blocks sleeved on the mandrel. The inner bushing in the barrel can be adjusted according to different screw blocks, so as to flexibly combine the ideal structural form of threaded elements according to the process requirements such as material varieties, so as to realize the transportation, plasticization, refinement, shearing, exhaust Various technological processes such as pressure building and extrusion, so as to better solve the contradiction between the so-called universality and specificity of screw, which is difficult to take into account in general, and achieve the purpose of one machine with multiple functions and one machine with multiple functions.

08-28 

Calculation method and performance introduction of twin screw extruder

Experts from Nanjing jiente electromechanical Co., Ltd., a service provider of twin-screw extruder, said that the screw diameter is an important technical parameter, and its size indicates the production capacity of twin-screw extruder to a certain extent. The larger the screw diameter, the greater the production capacity. Rotation range of twin-screw extruder the screw speed of twin-screw extruder can generally be adjusted steplessly. Its screw has a minimum and maximum number of revolutions. At present, the maximum speed can reach more than 1000r / min. The higher the rotating speed, the greater the shear force and the greater the output. In terms of chemical properties, twin-screw extruder is suitable for the transportation of compressed or corroded gases and liquids, which can bring high profits to investors. In terms of mechanics of twin-screw extruder: if the screw diameter remains unchanged and the screw speed is increased, the torque borne by the screw will increase. When the torque reaches a certain degree, the screw will be in danger of being broken. Twin screw extruder can reduce torque and improve the bearing capacity of the screw by improving the material and production process of the screw, reasonably designing the screw structure, shortening the length of the feed section, increasing the flow rate of the material and reducing the extrusion resistance. Due to the continuous expansion of the application market and technological breakthroughs, it can still maintain a slight upward trend on the whole. The sharp decline in the price of domestic twin-screw extruders in the market is inevitable. Rough manufacturing and price war have not only affected the overall image and market competitiveness of domestic plastic machines, but also hindered the development of plastic processing industry.