The principle of the PWM White LED Driver

Posted on May 19, 2012 by admin

Web Design And Seo For www.china-webdesign.com
128ⅹ64 lcd module – China Manufacturer
Thank you for inquiry my 128ⅹ64 lcd module, Tel： +86-571- 85121224, E-MAIL：sales@tsingtek.com
http://www.china-lcdmodule.com/key-128ⅹ64-lcd-module-66/

On this project, the PWM dimming LED driver circuit to provide the required voltage and current of the LED, and has a high

color temperature, the economy, long life. The electrical properties of the white LED has a highly decentralized?? And white

LED light source is a homomorphism, is a solid state lighting devices. It has small size, mechanical strength, low-power,

long life, easy to adjust and control, as well as environmentally friendly features, light great prospects for development of

new products. However, white LED forward voltage characteristics are very steep, very difficult to force a small white LED

voltage fluctuations lead to dramatic changes in the current work, and can even burn the LED. In order to maintain the

stability of the LED current, and to ensure normal and reliable LED to work properly, the design of the drive circuit is

important.
Electrical characteristics of a white LED
1.1 LED power indicator and the current
LED devices in the current range of LED forward current intensity increases, but different semiconductor materials, LED

devices, light intensity and the forward current relationship between the changes is different. Under normal circumstances,

the luminescence intensity increased if, iridium forward current increase.
If the curve of Ir and description, in order to achieve the desired light intensity, LED should be how much the drive

current. LED luminous intensity and forward current Figure 1 L red curve shows the light-emitting LED, for example, when a DC

current of 40 mA, the red LED luminous intensity will not change. In other words, until the red LED array to control direct

current reaches a certain value, the intensity will have a saturation trend.

1.2 the influence of temperature in the white LED forward current
The size of the white LED forward current, when the temperature changes, as shown in Figure 2, the use of white LEDs,

allowing the temperature curve of the direct current.

PWM LED
2.1 principles and form of a PWM signal
Blink of an eye is not sensitive to the load based on human characteristics, the PWM dimming brightness, LED lights, when it

is dark, dark, and if more than the light frequency of 100 Hz, the human eye can see is the average intensity, instead of

flashing . PWM brightness, time to adjust the brightness dimming of a small part. Using this method, and can adjust the load

and a fixed frequency digital signal is the ratio used to adjust the lightness or darkness of withdrawal period may darken,

but different brightness of the device or internal soft-start circuit area to restore normal speed, which is not very common.
The principle of the PWM is based on a fixed DC voltage, with some frequency by the open and close the switch K, thus

changing the LED on the control voltage. When the LED lights to set the maximum current Imax. Switch to open and close the T

-cycle, each closing time T, then the duty cycle D = T / T, the LED average current:

 

  
(1) can be seen in the T invariant (ie, from a fixed switching frequency switching), but only changed the time t, can change

the average current through the LED. To change the brightness of the LED.
The existence of three types: 1) stress – pulse transformer of the PWM signal forming circuit, and then pulse width modulated

signal generated by a hardware, 2) by the time of the software timer, timer to run the program most of the time, and with the

pulse signal output port P1.0 or other regulated output pulse signal, 3) hardware pulse width modulation signal generated by

the microcontroller external timer / counter (eg, 8253) control circuit, only two counters are used by hardware connecting l

and 2-way method can generate a PWM signal. The first of which kind of hardware circuit, the circuit complexity. Two methods

of using the timer, because the circumstances of the counter, but should be expanded. Third, the use of 8253, very

convenient, but spend less time software.
ATMEGA 16 microcontroller with 4-channel PWM, as well as the fast PWM mode, the phase correct PWM mode and other modes.

Taking into account the costs and simplify the entire system is directly ATMEGA 16 microcontroller designed to generate a PWM

signal.
2.2 the PWM White LED Driver
LED is proportional to the advantages of LED devices, which shows the average current and pulse current DC the same

conditions, although the brightness of the LED power indicator. In addition, the large amplitude of the LED current pulse,

and then by adjusting the pulse duty cycle to obtain a more suitable medium current, which can reduce energy consumption.

Because, when the LED pulse state is perceived by the human eye between the LED brightness and the average brightness between

the peak brightness value. Therefore, the DC drive LED direct drive current pulse LED lights, is to get the same brightness

pulse than required to control the average current value is less than the DC current production line of LED lights.
Second, the light-emitting diode drive pulse circuit, PWM control, compared with the DC control mode, the control of the

control will be relatively large in order to improve efficiency, while limiting resistor can be removed or reduced small

value. Therefore, from the point of view, the pulsed power drive better use of energy issues.
The pulse-oriented approach is the use of repeated switching power LED devices a way to make light of human visual inertia.

The use of this CD is usually taking into account the definition of the scope of the current amplitude and pulse repetition

frequency. DC drives, the average pulse current of the drive in order to get enough light?? Ia and DC drive should be the

same value. Figure 3?? Show, the average current transient current moment I have time

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The new Roll Crusher and other equipment to provide environmental protection for Chinas coal mining protection

Posted on May 17, 2012 by admin

Web Design And Seo For www.china-webdesign.com
raw mill – China Manufacturer
Thank you for inquiry my raw mill, Tel:86-371-60130026 E-MAIL:market@hnyigong.com
http://www.enchuangxin.com/key-raw-mill-42/

Learned from the China Meteorological Administration, with the arrival of mid-April, temperatures in most parts of China and over the same period temperatures significantly higher than from 51 after, my temperature\\ s rising, and the continuous arrival of hot weather will also give China\\ s electric power sector to bring a lot of pressure. Just yesterday, National Development and Reform Commission Joint several departments held a meeting to start building the 2012 coal reserve mechanism to ensure the normal supply and demand of the coal industry this year.

With the gradual warming of the global climate in the past few years, the temperature of most parts of China, the ordinary high electricity and other sectors were experiencing a problem, mainly due to shortage of coal and other fuels for electricity generation, resulting in power generation gap, it is also , in order to ensure the normal life of the residents in China have had to implement rolling blackouts.

The information shows that coal as a non-renewable resources are decreasing at an alarming rate, some of the old coal-rich areas have now been turned into a poor mining area, but coal is the basic fuel of the national industrial development can not be replaced, so this few years, the state has stepped up efforts to the exploration of new mines. Some experts believe that the substantial reduction in coal resources, the main reason is weak, the awareness of the protection of coal resources in China, many coal mining remains largely a personal or private workshops operating in mining equipment and technology is far less than national standardization requirements, and thus caused a great waste of coal mining.

Coal resources tense situation, the State proposed to vigorously rectify or close some of the serious waste and pollution are serious failure of coal mining enterprises, coal industry, how to adapt to the national situation to get long-term development benefits? The industry believes that the most effective way to achieve reform of the coal mines, learn advanced science and technology production equipment and innovative means of operation, to ensure that coal mining into a new, modernized production areas.

It is understood that the market, coal mining equipment, a lot of broken equipment in particular are countless innovative technology equipment production, the emergence of a number of top-notch professional enterprise, the housekeeper such as the production of mining machinery in China Zhengzhou peak Engineering Technology Co., Ltd., production of the Ring Hammer Crusher, Roll Crusher, reversible hammer crusher equipment for its large-scale production and environmental friendly advantages become customer widespread praise coal Professional broken equipment; Not only that, Zhengzhou peak made a series of achievements in the use of the waste coal gangue gangue grinder research and development can be achieved effectively crushed gangue materials to meet the building materials, the use of low calorific value fuel so broken out, also made a new contribution to waste recycling.

Actively build coal reserve system is our response to peak current, an important measure of peak coal, coal enterprises, we must vigorously to produce reform, use of a new technology, conservation of coal production equipment to increase productivity, which for our normal production and life is good coal supply security.

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Co2 laser marking machine for innovation

Posted on May 17, 2012 by admin

Web Design And Seo For www.china-webdesign.com
recording pig Fridge magnet – China Manufacturer
Thank you for inquiry my recording pig Fridge magnet , Tel: 86-0577-86573661, E-mail: wzsldz@laserkeychain.com
http://www.laserkeychain.com/key-recording-pig-fridge-magnet-38/

      Although the co2 laser technology development matures, the laser industry, the development of small and medium-power ultra pulse co2 laser has only just begun. With the demand for the development of research and development investments and laser markets believe that the rapid development and extensive use in the near future, this laser marking opportunities.
     Ultra pulse co2 laser laser marking ability to focus the laser output gathered in a short period of time, and manufacture of the object. Compared with other laser marking machine, the device processing better quality, more efficient work, improve work efficiency, industrial marking a new market advantage.
    Ultra pulse co2 laser marking machine is low price and easy maintenance. Worth of industrial manufacturers purchasing new ones.
    Chutian Laser s sections of the laser products such as ultra pulse co2 laser marking machines, advanced technology, high quality, welcome to consult buy CNC turret punch press technology trends.

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ISO FIX International Child safety seat standard anchoring system

Posted on May 15, 2012 by admin

What is the the ISOFIX international standard system?
The ISOFIX system – a dedicated car standard infant and child safety seat anchor system. The ISOFIX of the full name is \"InternationalStandardsOrganisationFIX Chinese meaning is: the fixtures of the International Organization for Standardization. It is a new standard to place a child seat in the car. This standard for many car manufacturers are accepted, its role is to make child seat installation is quick and simple.
Tailor-made child safety seats
Any selection of the parents of the child safety seat will agree that this is not a simple task, the Volvo is one of the few car manufacturers according to different car models infant and child safety seat, and in their own automotive products a variety of safety tests. The majority of infant and child safety seats are designed by the car seat manufacturers, these products can be applied to specific car models, but does not apply to other models or brands of cars. The method used to protect the baby chairs are also different.
The result is many infant and child safety seat for the car are the type of error, or is not installed correctly. The entire automotive industry has interest in this issue a long time, for the need to develop specific criteria applicable to all models of infant and child safety seat also reached a consensus by the International Standards Organization (ISO) set up a special Working Group. After a decade of work study, 15 participating countries in the Isofix system and reached a common agreement.
The new international standard
Isofix international standards, including the three main elements, including in the car seat backrest and cushion between the infant / child safety seat and the body itself that combines two dedicated anchor point. Can refer to such a standard to manufacture automotive products, and infant / child safety seat as required at random to be installed or dismantled. And another some Isofix infant / child safety seats are installed directly between the anchoring point, there is no separable structure.
Isofix international standards introduced in 1999. After 2000, the U.S. law already provides that: all new cars sold in the United States must have Isofix anchor points, Europe and other countries will soon introduce a similar law.
Many new cars have been put into use with the Isofix anchoring points, and are equipped with infant and child safety seat. So anyone who wants to and can afford to buy a new car with Isofix anchorage points have to buy such a configuration. However, Isofix anchoring points of the other owners must follow complex instructions to install other systems.
In foreign, domestic cars are basically support the ISOFIX interfaces and sales of automotive safety seat must have ISOFIX interface, but were only part of the vehicle seat with ISOFIX interface, so for families with children, in preparation the purchase of child car safety seat, but found that they have bought cars without ISOFIX interface, which is too much trouble. Therefore, early selection of a car with ISOFIX device is necessary. On the automobile market which domestic models with ISOFIX child safety seat device?
Skoda sharp
As a mainstream small family cars, the entire department of the crystal sharp, especially with the rare in the A0-class \"the ISOFIX child safety seat fixtures\" to meet the needs of all family members on traffic safety, the front seat belts tightening, coupled with German cars has always been known for handling and solid body welding process, the safety performance of the crystal sharp and comparable to high-class cars.
Guangqi Toyota Yaris
As a car, the Yaris in the child restraint on the performance is very excellent. First of all, the Yaris, especially with a child seat fixtures. With the child safety seat, can effectively prevent the rapid movement of the child\\ s physical forward in the vehicle collision or sudden, in a timely manner to protect the child\\ s torso and head; take into account the characteristics of children a good move, the Yaris is also equipped with child safety door lock.
The Yaris is a focus on child restraint boutique car
Pentium B50
Pentium B50 comes standard with four airbags, active safety seat, preload force limiters seat belt fixtures of the ISOFIX child safety seat, child lock, collapsible security to the column. Electronic systems, B50 Bosch\\ s ABS8.01 system, reversing radar, engine anti-theft system.
Corolla
In terms of security, COROLLA with GOA body, side and curtain SRS airbag, BA Brake Assist, VSC vehicle stability system, reversing ranging radar and other advanced security equipment, to bring great confidence in the safety for the occupants ; the safety of the ISOFIX child seat fixtures more children ride the most effective protection, and EPS electronic power steering system makes the handling has improved.
Octavia
Compared with the old models, 09 Octavia to add 15 to enhance the content, quality, fully upgraded. In addition to add new glazed blue body color and interior quality improvement, 09 Octavia new leading and practical devices, such as the GRA cruise control, tire pressure monitoring system, ESP electronic stability system and ISOFIX child seat fixed devices, which makes the cost of the Octavia model to be further enhanced.
BMW 3 Series
BMW 3 Series safety concept is to build strong body structure, the selective use of high strength steel as well as the transfer and absorption on the basis of the special deformation elements of the collision energy. In addition, all seats are equipped with six airbags, 3-point automatic belts and headrests, to provide the best protection for the crew. Moreover, rear seat ISOFIX child seat fixtures are provided as standard. The front seats of the BMW3 system comes standard with active head restraint, the assembly in the event of a collision can significantly reduce the risk of cervical spine injuries of the occupants.
Pentium B70
Passive safety of the Pentium B70 is equipped with dual front airbags, electronic security and burglar alarm, seat belt not fastened warning, the child safety seat is fixed, intelligent traffic automatic latch device, Pentium B70 in a child restraint safety aspects of walking in the the forefront of the independent brands.
Mercedes-Benz C Class
Mercedes-Benz C-class rear seat surface of the monolithic structure (standard equipment), three headrests and three inertia-reel seat belts to ensure the safety of passengers. The outer rear seats are also equipped with belt tensioners and belt force limiters, as well as standardized child seat fixing system, the ISOFIX.
Shanghai Volkswagen Touran
Shanghai Volkswagen is the early start of one of the manufacturers concerned about the child restraint. Shanghai Auto Show in April 2007, Shanghai Volkswagen launched they have developed child safety seat, the seat can be installed in a car with ISOFIX device to meet the baby home to the child restraint safety protection requirements. Volkswagen Touran, Passat are equipped with ISOFIX child seat fixtures, polo is not equipped with the upcoming new POLO will be equipped with this device.

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The vehicle child seat no more than a safety certification

Posted on May 15, 2012 by admin

Web Design And Seo For www.china-webdesign.com
automatic seat belt – China Manufacturer
Thank you for inquiry my automatic seat belt, Tel:0086-577-66613700, Email:chinaseatbelt@gmail.com
http://www.chinaseatbelt.com/key-automatic-seat-belts-6/

Child safety seat market hard to find
Mr. Yu decided to buy a \"buy car child seat really is not easy.\" Often in the process of car brakes, three-year-old son always bump your head, in this case experienced a number of similar Car child seat. \"I thought as long as people hold on the right, brake too hasty or fly out, his own co-pilot wearing a seatbelt will slip out, less secure.\" Mr. Yu in the automotive supplies store, but I did not find the children in safety seats. Finally, the introduction of a friend, Mr. Yu in a baby goods store to spend more than 1600 yuan to buy the goods you want. \"Some three or four hundred, some five or six thousand, look the same, I can only pick a middle price.\"
13 am, the crowd bustling automotive supplies market in Chongqing South Road, a variety of cars in the shop shop Goods put dazzling, but when you hear the car child safety seats, most of the clerk, but had rolled up his head. \"You went upstairs to go and see, never heard of selling.\" Turn over the entire automotive supplies city, only to find two sales of child safety seats, and the products are placed only two.
Price confusion, most of the safety certification
The reporters found that child safety seats on the market price is very confusing, from several hundred to a thousand dollars, consumers do not see the quality of the seat from the appearance and description. The relevant sales personnel do not quite understand the performance of the child safety seat, and some even the origin is not clear. An auto supplies store, the reporter consulted what kind of seats did the collision experiment, can guarantee when the brakes fixed, etc., the sales staff was bewildered.
It is understood that the use of child-specific safety devices can effectively children the chance of injury to reduce about 70%, Europe and the United States and other developed countries from the 1970s onwards has formulated strict laws and regulations and industry guidelines on the production of such products and using the guidance and norms. The city of Qingdao, private car ownership more than 1.8 million child restraint system, the average utilization rate of less than 5% of the correct usage rate is less than 2%.
According to the person in charge of Qingdao, China WorldCom Group, the current safety certification standards for child safety seats, most of the United States (FMVSS 214) or Europe (ECE R44/03) standard, printed on the seat side. On the market due to the lack of mandatory standards, there is no standard in most of the products sold.
Standard regulatory missing a weak awareness of parents
It is understood that only Guangqi Toyota, Shanghai GM Buick, Shanghai Volkswagen, Chevrolet, Changan Mazda, Peugeot, FAW Toyota, part of the brand\\ s models equipped with child safety seat fixtures, domestic hot is one of the few cars specially equipped with child safety seat fixtures.
Parents\\ car prices was the result of this situation, the main reason is because the demand is very small, conscious to buy children car safety seat is very small. \"The Qingdao Hugelent Auto Sales & Service Co., Ltd., general manager of Mr. Ban told reporters, child seats are generally age stages from 0 to 9 months, the security basket, 9 months to 4-year-old safety seat, but after 4 years of age have to be purchased separately. Because of high prices, short useful life, the seat became parents in the eyes of the \"tasteless\". In addition, double standards and regulatory missing a lot of inferior products mixed market.

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Speed ​​difference between seat belt retractable seat belt retractable seat belts

Posted on May 14, 2012 by admin

Web Design And Seo For www.china-webdesign.com
automatic seatbelt – China Manufacturer
Thank you for inquiry my automatic seatbelt, Tel:0086-577-66613700, Email:chinaseatbelt@gmail.com
http://www.chinaseatbelt.com/key-automatic-seat-belts-6/

Product description:
1) containing 60 * 800mm waist, seat belts with metal buckles behind a soft cloth pad to prevent the metal clasp and scratch the skin;
2) hook hook for the alloy steel stamping, heat treatment. Tensile strength greater than 23KN, chrome-plated surface. Overall weight-bearing impact force greater than 80KG;
3) with a buffered speed difference, and an opening 53mm alloy steel scaffold hook. Speed ​​difference between the length of the rope of the class 2M, the speed difference can automatically adjust based on the user\\ s working radius of connect tie length, to avoid connection in the course of their work to tie the other protrusion tangle caused by a fall hazard, such as an accident in a free fall, speed difference between the device can quickly self-locking, and to minimize the drop distance. (The longer the distance, the whereabouts of the whereabouts greater the impact).

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ISO FIX International Child safety seat standard anchoring system

Posted on May 13, 2012 by admin

What is the the ISOFIX international standard system?
The ISOFIX system – a dedicated car standard infant and child safety seat anchor system. The ISOFIX of the full name is \"InternationalStandardsOrganisationFIX Chinese meaning is: the fixtures of the International Organization for Standardization. It is a new standard to place a child seat in the car. This standard for many car manufacturers are accepted, its role is to make child seat installation is quick and simple.
Tailor-made child safety seats
Any selection of the parents of the child safety seat will agree that this is not a simple task, the Volvo is one of the few car manufacturers according to different car models infant and child safety seat, and in their own automotive products a variety of safety tests. The majority of infant and child safety seats are designed by the car seat manufacturers, these products can be applied to specific car models, but does not apply to other models or brands of cars. The method used to protect the baby chairs are also different.
The result is many infant and child safety seat for the car are the type of error, or is not installed correctly. The entire automotive industry has interest in this issue a long time, for the need to develop specific criteria applicable to all models of infant and child safety seat also reached a consensus by the International Standards Organization (ISO) set up a special Working Group. After a decade of work study, 15 participating countries in the Isofix system and reached a common agreement.
The new international standard
Isofix international standards, including the three main elements, including in the car seat backrest and cushion between the infant / child safety seat and the body itself that combines two dedicated anchor point. Can refer to such a standard to manufacture automotive products, and infant / child safety seat as required at random to be installed or dismantled. And another some Isofix infant / child safety seats are installed directly between the anchoring point, there is no separable structure.
Isofix international standards introduced in 1999. After 2000, the U.S. law already provides that: all new cars sold in the United States must have Isofix anchor points, Europe and other countries will soon introduce a similar law.
Many new cars have been put into use with the Isofix anchoring points, and are equipped with infant and child safety seat. So anyone who wants to and can afford to buy a new car with Isofix anchorage points have to buy such a configuration. However, Isofix anchoring points of the other owners must follow complex instructions to install other systems.
In foreign, domestic cars are basically support the ISOFIX interfaces and sales of automotive safety seat must have ISOFIX interface, but were only part of the vehicle seat with ISOFIX interface, so for families with children, in preparation the purchase of child car safety seat, but found that they have bought cars without ISOFIX interface, which is too much trouble. Therefore, early selection of a car with ISOFIX device is necessary. On the automobile market which domestic models with ISOFIX child safety seat device?
Skoda sharp
As a mainstream small family cars, the entire department of the crystal sharp, especially with the rare in the A0-class \"the ISOFIX child safety seat fixtures\" to meet the needs of all family members on traffic safety, the front seat belts tightening, coupled with German cars has always been known for handling and solid body welding process, the safety performance of the crystal sharp and comparable to high-class cars.
Guangqi Toyota Yaris
As a car, the Yaris in the child restraint on the performance is very excellent. First of all, the Yaris, especially with a child seat fixtures. With the child safety seat, can effectively prevent the rapid movement of the child\\ s physical forward in the vehicle collision or sudden, in a timely manner to protect the child\\ s torso and head; take into account the characteristics of children a good move, the Yaris is also equipped with child safety door lock.
The Yaris is a focus on child restraint boutique car
Pentium B50
Pentium B50 comes standard with four airbags, active safety seat, preload force limiters seat belt fixtures of the ISOFIX child safety seat, child lock, collapsible security to the column. Electronic systems, B50 Bosch\\ s ABS8.01 system, reversing radar, engine anti-theft system.
Corolla
In terms of security, COROLLA with GOA body, side and curtain SRS airbag, BA Brake Assist, VSC vehicle stability system, reversing ranging radar and other advanced security equipment, to bring great confidence in the safety for the occupants ; the safety of the ISOFIX child seat fixtures more children ride the most effective protection, and EPS electronic power steering system makes the handling has improved.
Octavia
Compared with the old models, 09 Octavia to add 15 to enhance the content, quality, fully upgraded. In addition to add new glazed blue body color and interior quality improvement, 09 Octavia new leading and practical devices, such as the GRA cruise control, tire pressure monitoring system, ESP electronic stability system and ISOFIX child seat fixed devices, which makes the cost of the Octavia model to be further enhanced.
BMW 3 Series
BMW 3 Series safety concept is to build strong body structure, the selective use of high strength steel as well as the transfer and absorption on the basis of the special deformation elements of the collision energy. In addition, all seats are equipped with six airbags, 3-point automatic belts and headrests, to provide the best protection for the crew. Moreover, rear seat ISOFIX child seat fixtures are provided as standard. The front seats of the BMW3 system comes standard with active head restraint, the assembly in the event of a collision can significantly reduce the risk of cervical spine injuries of the occupants.
Pentium B70
Passive safety of the Pentium B70 is equipped with dual front airbags, electronic security and burglar alarm, seat belt not fastened warning, the child safety seat is fixed, intelligent traffic automatic latch device, Pentium B70 in a child restraint safety aspects of walking in the the forefront of the independent brands.
Mercedes-Benz C Class
Mercedes-Benz C-class rear seat surface of the monolithic structure (standard equipment), three headrests and three inertia-reel seat belts to ensure the safety of passengers. The outer rear seats are also equipped with belt tensioners and belt force limiters, as well as standardized child seat fixing system, the ISOFIX.
Shanghai Volkswagen Touran
Shanghai Volkswagen is the early start of one of the manufacturers concerned about the child restraint. Shanghai Auto Show in April 2007, Shanghai Volkswagen launched they have developed child safety seat, the seat can be installed in a car with ISOFIX device to meet the baby home to the child restraint safety protection requirements. Volkswagen Touran, Passat are equipped with ISOFIX child seat fixtures, polo is not equipped with the upcoming new POLO will be equipped with this device.

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The vehicle child seat no more than a safety certification

Posted on May 13, 2012 by admin

Web Design And Seo For www.china-webdesign.com
automatic seat belt – China Manufacturer
Thank you for inquiry my automatic seat belt, Tel:0086-577-66613700, Email:chinaseatbelt@gmail.com
http://www.chinaseatbelt.com/key-automatic-seat-belts-6/

Child safety seat market hard to find
Mr. Yu decided to buy a \"buy car child seat really is not easy.\" Often in the process of car brakes, three-year-old son always bump your head, in this case experienced a number of similar Car child seat. \"I thought as long as people hold on the right, brake too hasty or fly out, his own co-pilot wearing a seatbelt will slip out, less secure.\" Mr. Yu in the automotive supplies store, but I did not find the children in safety seats. Finally, the introduction of a friend, Mr. Yu in a baby goods store to spend more than 1600 yuan to buy the goods you want. \"Some three or four hundred, some five or six thousand, look the same, I can only pick a middle price.\"
13 am, the crowd bustling automotive supplies market in Chongqing South Road, a variety of cars in the shop shop Goods put dazzling, but when you hear the car child safety seats, most of the clerk, but had rolled up his head. \"You went upstairs to go and see, never heard of selling.\" Turn over the entire automotive supplies city, only to find two sales of child safety seats, and the products are placed only two.
Price confusion, most of the safety certification
The reporters found that child safety seats on the market price is very confusing, from several hundred to a thousand dollars, consumers do not see the quality of the seat from the appearance and description. The relevant sales personnel do not quite understand the performance of the child safety seat, and some even the origin is not clear. An auto supplies store, the reporter consulted what kind of seats did the collision experiment, can guarantee when the brakes fixed, etc., the sales staff was bewildered.
It is understood that the use of child-specific safety devices can effectively children the chance of injury to reduce about 70%, Europe and the United States and other developed countries from the 1970s onwards has formulated strict laws and regulations and industry guidelines on the production of such products and using the guidance and norms. The city of Qingdao, private car ownership more than 1.8 million child restraint system, the average utilization rate of less than 5% of the correct usage rate is less than 2%.
According to the person in charge of Qingdao, China WorldCom Group, the current safety certification standards for child safety seats, most of the United States (FMVSS 214) or Europe (ECE R44/03) standard, printed on the seat side. On the market due to the lack of mandatory standards, there is no standard in most of the products sold.
Standard regulatory missing a weak awareness of parents
It is understood that only Guangqi Toyota, Shanghai GM Buick, Shanghai Volkswagen, Chevrolet, Changan Mazda, Peugeot, FAW Toyota, part of the brand\\ s models equipped with child safety seat fixtures, domestic hot is one of the few cars specially equipped with child safety seat fixtures.
Parents\\ car prices was the result of this situation, the main reason is because the demand is very small, conscious to buy children car safety seat is very small. \"The Qingdao Hugelent Auto Sales & Service Co., Ltd., general manager of Mr. Ban told reporters, child seats are generally age stages from 0 to 9 months, the security basket, 9 months to 4-year-old safety seat, but after 4 years of age have to be purchased separately. Because of high prices, short useful life, the seat became parents in the eyes of the \"tasteless\". In addition, double standards and regulatory missing a lot of inferior products mixed market.

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Arc worm gear reducer coupling selection

Posted on May 8, 2012 by admin

Web Design And Seo For www.china-webdesign.com
crane gearbox – China Manufacturer
Thank you for inquiry my crane gearbox, Tel:0086 21 37283520, E-MAIL:info@torkdrive.com
http://www.torkdrive.com/key-crane-gearbox-170/

  Arc worm gear reducer coupling a variety of optional type, but it is best not to use steel fixed coupling, the installation of such coupling is more difficult.
Selection of standard coupling design in the choice of coupling should first have been developed as a national standard, the standard of machinery industry and the coupling of the national patent, select, and only in the existing standard couplings and patent coupling can not be meet the design needs only need to design coupling. Select varieties, the type of understanding of the coupling (in particular, the flexible coupling) function in the transmission system, transmission system overall design considerations, and select the coupling species, type. According to the prime mover type and work load category, operating speed, driving accuracy, two-axis offset status, temperature, humidity, working environment, a combination of factors to select the varieties of the coupling.
According to the structural type of the supporting host need to select the coupling, coupling and brake supporting the use of, should choose with the brake wheel and brake disc type coupling; need to overload, it is desirable to select a safety coupling; with flange connection should select the flange; the axial dimension of the long distance transmission, connection, should choose to access the intermediate shaft type or receive intermediate size.
Arc worm gear reducer is very important to ensure a smooth and firm, Generally speaking, we should be installed in a horizontal base or base oil drainage grooves should be able to exclude, and the smooth circulation of cooling air. Fixed bad arc gear reducer, the basis is unreliable, there will be caused by vibration phenomenon also makes unnecessary damages to bearings and gears. Reducer installation location to ensure the operation of the staff, including the location of you can easily close the cursor, the vent plug and drain oil plug, etc. Circular Cylinder installation is complete, the accuracy of the inspectors in accordance with the order of a comprehensive inspection of the installation location to determine the reliability of the various fasteners. Speed ​​machine at install time, to pay special attention to the transmission center axis, otherwise it will cause the damage of the cylindrical worm reducer, improper installation will increase the load capacity, likely to cause bearing damage, and may even cause the output shaft fracture. Reducer drive couplings when necessary, the installation of protective devices, such as protrusion or the use of gears, sprocket couplings, if the output bearings subject to radial load larger, we should also choose enhanced. Arc tooth output shaft in the installation of transmission parts, soft operation to prohibit the use of hammers and other tools
The rude installation, it is best to install the assembly fixture and the side axis of the internal thread bolts screwed into the intensity of transmission pressed into the reducer, which can protect the internal parts of the reducer will not be damaged.
Before running, the worm gear speed reducer, but also ready to run, remove the vent plug of the oil pool replaced the vent plug, open the oil level plug screws to check the height of the oil line, add the oil over the oil plug screw hole overflow then tighten the oil bit slugging and to determine the correct, you can start trial run

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Analysis of planetary reducer installation method

Posted on May 6, 2012 by admin

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Planetary gear reducer installation method:
The family of the reducer, planetary reducer with its small size, high transmission efficiency, a wide range of deceleration, the precision of a little bit, is widely used in servo, stepper, DC transmission system. Its role is to ensure the precise transmission of the premise, is mainly used to reduce the speed to increase torque and reduce the load / motor inertia ratio. In the past few years, and some users in the use of reducer, due to human factors such as unauthorized installations, which led to the gearhead output shaft broken, so that enterprises have suffered unnecessary losses. Therefore, in order to better help customers with good use of reducer to you in detail how to properly install the planetary gear.
Proper installation, use and maintenance of the reducer is to ensure that an important part of the normal operation of machinery and equipment. Therefore, the planetary gear is installed, be sure to strictly in accordance with the following installation related matters, assembly and use.
First step
Confirm the motor and reducer are intact prior to installation and strictly check the size of the motor and speed reducer is connected to all parts of the match, here is the positioning of the motor boss, the input shaft and the reducer groove size and matching tolerances.
The second step
Slow down on the flange hole of the outside dust, machine screws, unscrew and adjust the clamping ring to the side of the hole and the dust hole alignment of the PCS system, insert hexagonal tighten. After removal of the motor shaft key.
The third step
The motor and reducer natural connection. The connection must guarantee the consistency of the speed reducer output shaft and the motor input shaft concentricity, and the two lateral flanges parallel. As the heart of inconsistency will lead to the motor shaft broken or reducer gear wear.
In addition, during installation, is strictly prohibited with a hammer and other hit, to prevent the axial force, radial force is too large damage to the bearings or gears. To install the bolts tightened and then spin tightly to force the bolt. Before installation, the motor input shaft, positioning boss reducer joints, anti-rust oil with gasoline or zinc, sodium and water to wipe the net. Its purpose is to ensure connection of compactness and flexibility of operation, and prevent unnecessary wear and tear.
Before connecting the motor and reducer should first bolt vertical motor shaft keyway and compact power. In order to ensure uniform force, first an arbitrary spin on the angular position of the mounting bolts, but do not tighten the other two pairs of the angular position of the mounting bolts, and then screw on the last one by one to tighten the four mounting bolts. Finally, the spin tightly force the bolt. All bolts need to be tight power torque wrench according to the fixed torque data indicated fixed and inspection.
Deceleration between the correct installation of the machines and mechanical equipment similar to slow down and drive motor is installed correctly. The key must ensure that the reducer output shaft and the driven part of the shaft concentricity consistent.
Hebei Bridge Star Gear Machine Manufacturing Co., Ltd. is located in the famous hometown of acrobatics — Wuqiao company covers an area of ??more than 20,000 square meters, nearly two decades of production history, design, manufacturing and selling all kinds of reducer specialized companies.
Our main products slow down the machine (arc gear reducer, worm series, plane enveloping speed reducer, reducer) cone enveloping worm gear NMRV series aluminum alloy shell, X, B series cycloid pin wheel reducer WB series micro-cycloid reducer cylindrical gear series reducer (Hardened reducer, worm gear screw lift of circular cylindrical reducer) SWL (QWL), the product has been fully passed ISO9001: 2000 certification, to meet the market demand constantly develop new products, developed a dedicated reducer for irrigation equipment, greenhouses rolling machines dedicated reducer, electric furnace dedicated reducer sets of silk machine dedicated reducer, such as a series of high technological content of new products, we will be quality products, perfect after-sales service, dedicated service attitude and dedication service for our customers.
Produced reasonable reducer institutions and superior performance, widely used in metallurgy, mining, lifting, transportation, petroleum, chemical, pharmaceutical, food, light industry sector deceleration devices. Our strong technical force, excellent equipment, advanced technology, complete detection. Complete product specifications, reasonable price, and abide by the contract, and after-sales service system. And to undertake the design and manufacture of special specifications reducer, enthusiasm for the modernization of the sector to provide a novel mechanical transmission and ancillary services. The company has always pursued the \"honest and trustworthy, do Rise of the\" business purpose, adhere to the principle of \"quality first, customer first\" sincere and effective cooperation with our customers.

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