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By: wang hong

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Tuesday, 13-Dec-2011 01:09 Email | Share | | Bookmark
Good use of clean cotton from the experience of leveling instrum

<p> as technology advances, more cotton using existing self-leveling device to replace the original A076-type roll machine Lilium device. It not only drives simple, and the volume rate is significantly higher than Lilium device, cotton has been more understanding and praise. But there are other reasons due to improper testing method, lack of knowledge of the technique can not properly perform its role. To this end, now Platt production in Wuxi ZNC-800 Series Qing Hua frequency self-modulation device as an example, the use of my factory experience. </ P> <p> variable frequency self-modulation instrument mainly by high-precision displacement sensor, auto-level controller, inverter, with normal motor and reduction gear and pressurized heavy hammer to nail and so on. Its working principle is to retain the balance of the total link at the curved bar, direct pressure with a heavy hammer. Balance of the day flat curved bar with roller between the cotton layer thickness changes, the connecting rod to hammer together with displacement sensors up and down displacement occurred. At this time, the sensor contacts to nail the role of testimony in the stretching displacement. Variation of the displacement sensor into a voltage signal ± 2 V, a series of lost Leveling function operation processing controller, the controller output 0 V ~ 5 V analog voltage, within the territory to the inverter frequency processing. The inverter output corresponds to 0 V ~ 5 V analog three-phase AC frequency, according to the relationship between hyperbolic nH = K simulation control motor speed. The motor speed reducer output shaft sprocket Z1 (driving wheel) drive the balance shaft sprocket roller Z2 (passive wheels), so that the balance roller in the cotton output per unit time remained relatively constant. </ P> <p> These are the theoretical requirements. It Lilium shape curve, cosmetic bag as in the design included in some cases difficult to eleven, so need to use in the production of a number of adjustments. For example, the cotton layer of density fluctuations in output and cotton boxes and operational aspects and some other factors will affect the self-leveling device even play a regulatory role. Therefore, the use of the process of self-leveling device for changes in production factors, must be reasonable adjustments in order to play a greater performance. To ensure the normal functioning, generally have the following adjustment methods: </ p> <p> (1) adjust the method of displacement transducer sensor operating range ± 10 mm (that is, the amount of contact stretching), the controller was on the table number corresponding to the significant number of -20 to +20. When the feed roller balance at normal thickness cotton, adjustable height positioning the displacement sensor, the controller was the number 0 appears on the table near the changing number. Lilium Lilium equivalent to the original belt is located in the middle, which means that the positioning of the displacement sensor can effectively detect changes in thickness of cotton into ± 2 V and the corresponding voltage transmission to the controller handle, and then control the inverter frequency, the motor response of cotton layer changes in the thickness of the corresponding output speed. Such as feed rollers at the cotton balance even when the state is better, but also disrupts the lap irregularity, excessive speed devastating, so hard to control lap uneven rate below 1%. Therefore, the positioning of the sensor is particularly important and should be preferred. I have the general control of branch 0 mm ~ 10 mm range of motion, so that the number on the controller display changes in the 5 or so. </ P> <p> (2) methods of weight adjustment knob in the normal operation, LED spot light the motor speed knob to set the constant speed and weight sensors detect the speed and synthesis. The knob is used to set the lap of the basic weight, but also the basic motor speed, the constant speed setting. It is based on the average volume of cotton layer thickness is required when the average speed settings. The pointer scale range of 0 to 10, each scale of variation of about 5 Hz, and the inverter frequency is proportional to the inverter output frequency and motor speed control relationship shown in Table 1. Turn the knob clockwise, such as the frequency increases, the basic motor speed, and vice versa slow. Lilium device with the original hexagonal nut severity of the role of regulating the same, is used to adjust the severity of the lap. According to my factory practice, when the pointer scale in the test set is about as good in 6. In this way, you can more easily increase or reduce the lap weight, and there are more room for adjustment. </ P>


Friday, 9-Dec-2011 01:03 Email | Share | | Bookmark
How to choose the right temperature sensor

<p> Introduction </ p> <p> most extensive measurement of physical parameters is temperature. Whether in the processing of industrial applications or in a laboratory environment, accurate temperature measurement is the key to success. Medical applications,
chevrolet cruze dvd materials research laboratory, electrical / electronic components research, biology, geology studies and thermal analysis equipment, electrical products require accurate temperature measurements. </ P> <p> There are many different types of sensors can be used for temperature measurement. The three most common temperature sensors are resistance temperature detector (RTD), thermocouple (TC) and thermal resistance. They have a specific operating parameters will make it more suitable for some applications. Solid-state sensors can also be used in medium temperature range applications, and has built-in signal conditioning and easy to connect the advantages of - in some cases with direct digital serial interface. Because of this sensor is not within the scope of this article, so I do not make no detail. </ P> <p> choose a temperature sensor </ p> <p> When the temperature sensor when there are many issues to consider. First, we must consider the application type. What the device parameters to be measured? Indoors or in the case of ambient temperature? With plastic or metal can package electronic components high pressure? Or to measure the red-hot steel ingot? Or a car engine parts, such as intake or exhaust port? Some of these considerations will be due to environmental and safety factors, and every single sensor's cost estimates and the distance from the sensor to the instrument to determine the sensor selection. </ P> <p> next thing to consider is the expected temperature measurement range. Modules in a fully warm engine after temperatures up to 100oC or more. Most thermocouple to measure this temperature range, and such application is the most common K-type thermocouple. On the other hand, ceramic kiln can reach several hundred degrees Celsius. N-type is suitable for higher temperature, because they are stable and high temperature oxidation. The other end of the scale, close to several superconducting devices in Kelvin (or just above absolute zero, or-273oC) to achieve very low temperatures, superconductivity, superconductors, so the sensor must be able to withstand working temperatures below freezing. High output (about 68uV / C) E-type thermocouple may be more appropriate, because they </ p> <p> very suitable for low temperature work. Table 1 shows the summary of TC and its range. </ P> <p> Another consideration is the area available for mounting the sensor in order to fully measure the test temperature. The device under test must have adequate space for the selected sensor. For example, the IC is the micro-electronic devices,LED solar street light so the correct choice of sensor depends on the test parameters, IC package or lead frame or chip itself. Most sensors have a variety of shapes and sizes, of which there must be a meet application requirements. Galvanically isolated RTD with a good size, isolation and accuracy may be micro-electronic circuit IC the best choice. </ P>


Wednesday, 7-Dec-2011 05:53 Email | Share | | Bookmark
Tips stone veneer stone can be divided into ten areas

<p> as a decorative stone, people not only from its color, pattern, etc. to achieve the purpose of decoration, but also from the stone effect finishes to achieve the purpose of decoration, its stone veneer can be divided into the following ten aspects </ p> <p> 1, polished surface:. Will be flat with the abrasive rough grinding, fine grinding, grinding, and polishing powder them, polishing agent to be processed from the finish. The surface bright as a mirror, brightly colored, pores are few and small. </ P> <p> 2, matt surface: abrasive will be used for coarse grinding plate, finely ground processed, its brightness and color finishes are less than polished surfaces. The relatively smooth surface, LED solar street light porous. This texture finishes commonly used in public places. The surface color of light than the polished surface. </ P> <p> 3, polished surface: coarse grinding with abrasive will be processed from the flat, its brightness and color finishes are lower than the matt surface. The relatively smooth surface, porous. This texture finishes are commonly used in public places. The surface color of light than the matte surface. </ P> <p> 4, the cut surface: a direct process with a saw made of a matte surface color is a light, showing saw marks. The main requirements of a rough surface for some decorative finishes. </ P> <p> 5, set fire to the surface: a mixture of acetylene and oxygen gas jet burning stone plate surface,trolley bag the surface layer of the burst, the uneven surface finishes. The surface color is a light, porous, water absorption. </ P> <p> 6, Gouge surface: Gouge pound stone surface of the steel to obtain the point-like texture finishes (also known as litchi surface of this area), or strip texture finishes. The rough texture of the density and degree of choice. Surface color is a light, large pores, high water absorption than the burning surface. </ P> <p> 7, ax chop surface: The ax hit the pound striped stone surface finishes available. The rough texture of the density and degree of choice. Surface color is a light, large pores, water absorption is very large. </ P> <p> 8, sandblasted surface: sand and water high-pressure shock formed by the surface rough stone surface, the surface color is a light, uniform texture, but the larger pores, high water absorption. </ P> <p> 9, mushrooms surface: the use of steel chisel or ax hit the pound mushroom-shaped stone surface to obtain the surface, its texture is very rough, the surface color than the bleak, large pores, water absorption is also large. </ P> <p> 10, hit wedge surface: Slate in manual or mechanical processing of wedge play, the board received a natural stone slightly rough texture finishes. The surface color darker, pores small, small water absorption. </ P>


Monday, 5-Dec-2011 01:41 Email | Share | | Bookmark
2011LED technology trends: LED backlight to give the force devel

discussion of the prospects of LED <p> is commonplace, due to long life, low energy consumption, small size, fast response, seismic resistance to low temperature, pollution and other prominent advantages, and its applications is very broad. Preliminary calculations, the future of China's annual use of LED lighting to save electricity equivalent to annual power generation of Three Gorges power plant, while reducing 80 million tons CO2,320,000 tons of SO2 and NO2 emissions, pet-bag called "Lighting in the history of mankind revolution "is not an exaggeration. </ P> <p> very rapid development of semiconductor lighting. Statistics show that since the inception of the 1960s, every decade, LED costs down ten times and ten times the luminous efficiency. And technical progress always exceed market expectations. Especially in 2008, the Beijing Olympic Games to the LED and hit a shot in the arm, the opening ceremony of the "Dream scroll" is displayed on more than 4500 square meters, called the world's largest single full-color LED display, When the LED arrangement made by the 45000's "Dream Five Rings" took off, the people of the LED's enthusiasm reached a new high point. </ P> <p> recent years, LED rapid increase in luminous efficiency and with low power consumption, environmental protection and other features, the lead product in traffic signals, automotive, outdoor signage, lighting and LCD backlighting market segments such as the gradual expansion . With the Chinese Government to promote China's semiconductor lighting will soon be a bright industry. According to statistics, in 2010, the global LED application market of 500 million; China LED application market of 600 billion yuan. </ P> <p> LED backlight for high-side LED backlight of the most eye-catching, LED as LCD backlight applications, with a long life, high luminous efficiency, and cost performance without interference, has been widely used in digital watches , cell phone, BP machines, electronic calculators and credit card machines, with the increasing miniaturization of portable electronic products, LED backlight advantages, so backlight technology will produce more low-profile, low power consumption and develop uniform. LED is a key component of mobile phones, mobile phone or PHS is about an ordinary use of the LED device 10, and with a color screen and a camera phone you need to use about 20 LED devices. At this stage a very large amount of mobile phone backlight, a year to use 3.5 billion LED chips. At present, China mobile phone production capacity considerably, and most of the LED backlight or imported for domestic LED products, this is an excellent market opportunity. </ P> <p> from an IT perspective, LED backlighting is an important year for development in 2010, LED backlight with green mercury-free, regional dynamic backlight control, low-carbon energy, ultra-thin appearance of flow lines high-fidelity color reproduction of the show, etc., greatly promoted the pace of the LED instead of CCFL.LED solar street light Various manufacturers and LED backlight manufacturers a partnership, co-sponsored program, large-size light guide plate with the latest technologies. Ultra-thin, energy saving, high-quality color LED backlight, backlight will become a strong trend in the development of the next. </ P> <p> but the LED backlight module is not without its shortcomings, the power consumption of the LED backlight module is still an important issue that must be overcome. As a result of more of the LED, in addition to increased power consumption, but also lead to temperature problems, and therefore must increase the cooling system and sensors to solve this problem, and therefore appear more on the thickness of the product comes with CCFL backlight thick. </ P>


Monday, 5-Dec-2011 01:37 Email | Share | | Bookmark
2011LED technology trends: LED backlight to give the force devel

discussion of the prospects of LED <p> is commonplace, due to long life, low energy consumption, small size, fast response, seismic resistance to low temperature, pollution and other prominent advantages, and its applications is very broad. Preliminary calculations, the future of China's annual use of LED lighting to save electricity equivalent to annual power generation of Three Gorges power plant, while reducing 80 million tons CO2,320,000 tons of SO2 and NO2 emissions, pet-bag called "Lighting in the history of mankind revolution "is not an exaggeration. </ P> <p> very rapid development of semiconductor lighting. Statistics show that since the inception of the 1960s, every decade, LED costs down ten times and ten times the luminous efficiency. And technical progress always exceed market expectations. Especially in 2008, the Beijing Olympic Games to the LED and hit a shot in the arm, the opening ceremony of the "Dream scroll" is displayed on more than 4500 square meters, called the world's largest single full-color LED display, When the LED arrangement made by the 45000's "Dream Five Rings" took off, the people of the LED's enthusiasm reached a new high point. </ P> <p> recent years, LED rapid increase in luminous efficiency and with low power consumption, environmental protection and other features, the lead product in traffic signals, automotive, outdoor signage, lighting and LCD backlighting market segments such as the gradual expansion . With the Chinese Government to promote China's semiconductor lighting will soon be a bright industry. According to statistics, in 2010, the global LED application market of 500 million; China LED application market of 600 billion yuan. </ P> <p> LED backlight for high-side LED backlight of the most eye-catching, LED as LCD backlight applications, with a long life, high luminous efficiency, and cost performance without interference, has been widely used in digital watches , cell phone, BP machines, electronic calculators and credit card machines, with the increasing miniaturization of portable electronic products, LED backlight advantages, so backlight technology will produce more low-profile, low power consumption and develop uniform. LED is a key component of mobile phones, mobile phone or PHS is about an ordinary use of the LED device 10, and with a color screen and a camera phone you need to use about 20 LED devices. At this stage a very large amount of mobile phone backlight, a year to use 3.5 billion LED chips. At present, China mobile phone production capacity considerably, and most of the LED backlight or imported for domestic LED products, this is an excellent market opportunity. </ P> <p> from an IT perspective, LED backlighting is an important year for development in 2010, LED backlight with green mercury-free, regional dynamic backlight control, low-carbon energy, ultra-thin appearance of flow lines high-fidelity color reproduction of the show, etc., greatly promoted the pace of the LED instead of CCFL.LED solar street light Various manufacturers and LED backlight manufacturers a partnership, co-sponsored program, large-size light guide plate with the latest technologies. Ultra-thin, energy saving, high-quality color LED backlight, backlight will become a strong trend in the development of the next. </ P> <p> but the LED backlight module is not without its shortcomings, the power consumption of the LED backlight module is still an important issue that must be overcome. As a result of more of the LED, in addition to increased power consumption, but also lead to temperature problems, and therefore must increase the cooling system and sensors to solve this problem, and therefore appear more on the thickness of the product comes with CCFL backlight thick. </ P>[img]


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