The active cone gear of the central transmission is mounted on the engine high pressure compressor shaft, and rotates coaxially, in the same direction and at the same speed as the high pressure rotor. Through the driven bevel gear and the transmission shaft, the rotation of the engine rotor is changed to be perpendicular to the engine axis, and the power of the rotor is transmitted to the outside of the engine, and then through a series of transmission members such as a spur gear, a bevel gear, etc., according to a certain rotation speed, Requirements such as power, steering and installation spacing drive the engine accessories and aircraft accessories systems. When the engine is working, the transmission system torque transmission sequence is: high-pressure rotor active bevel gear driven bevel gear engine accessory machine flexible shaft aircraft attachment machine. When the engine is started, the torque transmission sequence is reversed, that is, the turbine starter aircraft accessory machine, the flexible shaft engine accessory machine, the driven bevel gear, the active bevel gear high-pressure rotor.
The status quo of gear materials China's engine technology is constantly improving, and the design and processing technology of transmission gears are constantly improving. However, gear materials have been dominated by 12Cr2Ni4A steel for decades, and there is no replacement of steel grades. The smelting technology of gear steel, the forging technology of water-cooled screw unit and the carburizing process have also made little progress. Compared with the gear material technology of Russia and other countries, the gap is large and it is no longer suitable for the development of engine technology.
The manufacturing process of the transmission gear is basically the same. Generally, the bar is used after forging and tempering by partial forging, high-temperature tempering, quenching, and tempering. The carbide diffusion layer of the carburized layer is shallow and the core structure is coarse. The carburized layer has a deeper carbide diffusion layer, and the hardness of the carburized layer is flattened from the surface to the inside, and the core structure is finer. These differences are mainly determined by alloying elements, in addition to heat treatment technology. The structure of the carburized layer is ideal, the carbide is granular and evenly distributed, and the hardness of the carburized layer is gradually reduced from the surface to the inside. Although the metal flow lines of the domestic gears are basically distributed along the shape of the parts, the flow lines of the teeth are mostly cut, and the needle-shaped martensite structure of the carburized layer is more. The carbides in the carburized layer are mostly in the form of horns and flakes, and are coarse and unevenly distributed. The hardness of the carburized layer is larger by the decreasing gradient in the table and the inside. Obviously, such a carburized layer structure is very disadvantageous to the wear resistance and fatigue properties of the gear.
The hopper dryers of RDM series are quick-drying equipments for non-hygroscopic plastics and rubber. They can dry the
humidified raw material caused by packing, transportation and retrieving. The equipment is best to be directly installed on the
plastics or rubber molding machine. It is quick to install and it can save space. For all types of the equipments, the 24-hrs timer is available as option.
The characteristics of the Hot Air Driers:
(1)Nice design and appearance
(2)Hot wind extending device in high efficiency and distributing evenly so that high drying efficiency is achieved
(3)Special bend design guarantees hot wind coming in a smooth way. Convenient for maintenance
(4)The hopper and the internal parts are made of stainless steel
(5)As the hopper body is separable from the bottom part, it is very convenient to clean the hopper so that it is quick to add another material
(6)Overheat protection device to reduce the accidents caused by human being or mechanical breakdown
(7)Main power source switch for safety purpose
(8)Magnetic base and normal base with transparent window for options
Introduction:
RDM series hopper dryers offer an effective and low-cost method for plastic material drying. Hot air is used to dry wet materials
that due to moisture absorption during packaging, transportation, and recycling cycles. They can be directly mounted on the molding machine for quick drying and space saving. For this series, hot air blows evenly from bottom to the top (both RDM-800 and
RDM-1000 have down-blowing air pipe and accessible door for easy material clearance) of the hopper with capacity ranging from 12~1,000kg, Optional 24-hour timer is available for each model.
Features:
Adopt hot air diffuser to gain an even hot air flow to improve drying efficiency.
Unique hot air inlet elbow design can prevent dust piling up at bottom of the pipe heaters so as to avoid burning.
All material contact surfaces are made of stainless steel to eliminate material contamination..
Hopper separated from its base, ensuring convenient cleaning..
Proportional deviation display thermostat for accurate temperature control..
All series are equipped with exposed power switch.
Equipped with excitation tripping overheat protection, making machine operation secure and reliable..
Overheat tripping can automatically cut off power when drying temperature exceeds set deviation value.
Adopts heat-insulated blower to prolong blower lifespan. 24 hours auto start/stop timer and double insulated hopper are available
as options.
Cyclone dust separator, exhaust air filter, magnetic base and blower inlet filter are optional.
Hot air recycler, suction box, hopper magnetic, A type and L type floor stand and storage hopper are optional.
Hopper Dryer
Hopper Dryer,Plastic Hopper Dryer,Plastic Dryer,Plastic Drying Machine,Hot Air Driers
Ningbo Beilun Rhong Machinery Manufacturing Co., Ltd. , http://www.rhongmachinery.com