Author: Xugong Institute of Zhang read "Arab robe mystery" felt recently in the "reader" read a 2006 seventh "Arab robe mystery" article, the author quite sentiment, and think about all that Construction Machinery Product Design. The article said that the midsummer desert temperatures as high as 40-50 degrees Celsius, but local residents wearing a large Arab robes in the heat waves scorching desert walking seemed calm, if nothing had happened. The article also made a comparative test, when tourists wearing white shirts and shorts walking in the desert, feel hot and tough. Then put on the Arab robe, there is a kind of unspeakable cool and comfortable feeling. The large robes, cooler than shorter ones, may sound unbelievable, but they do have compelling scientific truths. 1, chimney effect. Arab robes generous, can cover the whole body, outside the wind to robe, can quickly channeling up and down, the body's moisture swept away; 2, heat insulation. Arab robes can block the direct sunlight on the body surface, while the air filled with robes and good heat insulation, making people feel cool and comfortable; 3, to create a suitable microclimate. The design of the robe plays a good role in the creation of comfortable microclimates. The air temperature in the winter and summer robe is always between 31 and 33 degrees Celsius and the relative humidity is between 40 and 60%. 4, cloth robe. Make the robe fabric choose those who absorb the temperature and the sporadic are better fabrics, such as hemp, silk, cotton fabric, etc .; 5, robe color. Mostly choose light colors, generally white, light blue, light green, in order to minimize the absorption of heat. Engineering machinery products engine cooling system heat balance problem has always plagued us the crux of the problem, over the years can not be fundamentally resolved. The author believes that in addition to the correct matching cooling system (such as tourists should be a healthy person), and the creation of a small climate (the role of robe) is also crucial, is an integral part of the cooling system, or impossible Achieve good results. Just as visitors in white deserted shirts and shorts (and even shirtless ones) walk in the desert, they feel overwhelmed. The following cooling system (non-independent cooling system) design concept to talk about their feelings. 1, "Chimney effect" is very important. Cooling system that is, there must be smooth air duct design, similar to the "robe" to form a "chimney effect." Cold wind can be smooth inhalation, hot air can be discharged smoothly, does not form a vortex. Engine duct design is reasonable, the intake and exhaust volume is enough, a direct impact on cooling efficiency, I noticed some well-known foreign brands in the cooling system design, great emphasis on duct design, whether it is suction or hair style , The design of the air duct is very particular about, very worthy of our study and reference. To the author's intuitive impression is that foreign products engine cooling system hood "cover it very tight," while the cooling effect is able to meet the requirements of the use of hot summer heat. Domestic products in this area there is still a gap, some products, engine cooling system did not consider the duct design, everywhere into the wind out of the wind, mixed hot and cold air, but in the engine cooling system installed around a simple shed for shelter rain. Some even hide, like a naked tourist sun exposure in the desert. It is recommended to carefully study and learn from the cooling system duct design technology of products such as Carter, Komatsu, Volvo, Bomag, Dynapac and so on. The air duct design technologies of different categories and different working conditions are different, fully reflecting different machines In the face of different homework and operating environment adaptability countermeasures, careful taste, presumably there will be gains. 2, hot and cold wind isolation effect is very obvious. The purpose of isolation is to ensure that the inhaled air is fresh air at ambient temperature and that the second is to prevent the hot air from flowing back into the radiator again. Hot air from the radiator has a considerable resistance, the hot air may flow back from the radiator around to the suction side of the fan, so that the cooling air temperature, cooling efficiency decreased. The measure is to block the gap between the radiator and the inner side of the hood to completely separate the area before the radiator from the engine room so as to effectively reduce the recirculation of the hot air. The air inlet on the hood should be facing the radiator fan, to have sufficient intake air volume, minimize the intake resistance. Hot air discharge should be smooth, do not form a hot air turbulence, as far as possible to prevent hot air on the other parts of the secondary heating, such as pumps, hydraulic tanks, etc., if necessary, can be set insulation. 3, in order to create a suitable "microclimate", the hood of the internal and external structure design, the material of the hood and the color of the outer surface are very particular about. The hood itself is equivalent to the "Arab robe", it is necessary to pay attention to the appearance of beauty, but also consider the internal realization of the function. The material of the hood is made of metal and non-metal materials, metal materials, insulation, sound insulation as non-metallic materials. The outer surface of the hood should be smooth, painted light-colored finish, which can reduce heat absorption. The inner surface should also be smooth, neat, minimize wind resistance, do not form eddy currents, but also paste the sound-absorbing material to reduce the working noise. These are the author combined with the product cooling system design a sense of read, perhaps a kind of play. In fact, "robe" design and hood duct design. The connotation between the two is the same, all have the science of survival of the fittest. I hope that the author's understanding and perception can be a little help to product design and improvement.
Rotary Tablet Press
Classification of tablet press: Models can be divided into single punch tablet press, rotary tablet press, sub-high speed rotary tablet press, automatic high speed tablet press and rotary core tablet press.
The sheet shape pressed by the tablet press is initially flat circular, and later developed into shallow circular arc and deep circular arc on both sides, which is for the need of coating. With the development of special-shaped tablet press, oval, triangle, oblong, square, diamond, circular ring tablets followed. In addition, with the continuous development of preparations, due to the requirements of compound preparations and timed release preparations, special tablets such as double layer, triple layer and core coating are made, which need to be completed on special tablet press.
Rotary tablet press is a machine which is made of several pairs of die distributed on the turntable to make a circular lifting movement according to a certain track and press the granular material into tablet through the press wheel. And the stamping rod with the rotary table rotating speed ≥60m/min line press is called high-speed rotary tablet press, this high-speed rotary tablet press has a forced feeding mechanism, the machine is controlled by PLC, has the automatic adjustment of pressure, control the weight of the piece, eliminate the waste piece, print data, display fault shutdown and other functions, in addition to the control of the weight difference within a certain range, Quality problems such as missing Angle and loose lobe can be automatically identified and eliminated.
With the development of market demand, the scope of application of tablet press is more and more wide, no longer simply limited to the suppression of Chinese and Western medicine tablets, more widely suppressed health food, veterinary medicine tablets, chemical tablets: such as mothballs, washing blocks, smurf blocks, art powder, pesticide tablets, food tablets: chicken essence block, isatis root block, divine Qu tea block, compressed biscuits.
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