188 Kaiyuan Avenue, Guangzhou Science City, Guangdong Province
Guangzhou Hengji Electronic Technology Co., Ltd. has its own research and development capabilities, specializing in the production of circular, radio frequency, rectangular, inter-board isoelectric connectors, and also engaged in research and development of various types of cable components products. It is the only private connector manufacturer in the military industry in Guangdong Province, a model enterprise of civil-military integration.
Guangzhou Hengji Electronic Technology Co., Ltd. was founded in June 2003, located in Guangzhou Science City, known as Silicon Valley of China. Since its inception, the company has been focusing on research and development and production of electrical connectors, the main products are YW series high-speed network circular connectors (the series of products won the National Science and Technology Innovation Fund); YQ series of highly reliable waterproof circular connectors; DXSM spring rectangular connectors; high-frequency connectors; board connectors and various cable components.
Our company has a long-term commitment to the electrical connector industry, high education, high capacity, high-quality core leadership team, to create a "scientific and technological innovation" and "quality management" as the main core competitiveness of enterprises. Since its establishment, the company has invested more than 10% of its sales revenue in the research and development of new products and technologies every year. It has a number of national patents. With the specialization and high reliability of products, the company's technological innovation strength has been at the forefront of the industry and won the National Science and Technology Innovation Fund, which is a "high-tech enterprise in Guangdong Province". Our company has also established a good strategic partnership and win-win model with well-known high-tech enterprises at home and abroad. Customer trust is the premise of our sustainable development. Our company always adheres to the principle of "customer-centered, market-oriented, rapid response, providing customers with a full range of connectivity solutions at the first time." Business philosophy, through precision products, meticulous production, accurate delivery, sincere service to achieve the commitment to customers. Customer satisfaction is our company's consistent purpose. Our company's professional team can provide customers with 360 degree all-round services before, during and after sales, and can provide customized special solutions to the whole case and other personalized services.
The company has first-class domestic production equipment and production technology, and has passed the military quality system certification and ISO 9001:2008 quality system certification. With strong technical strength and advanced management system, our company has the ability to mass produce high reliability connectors and cable components. At the same time, the company regards quality as the life of the enterprise. It introduces and uses advanced management tools such as SPC and Lean Six Sigma. It has high standards and strict requirements for the production process, which makes the company's quality management work more scientific and rigorous, and ensures that every product is a high reliability benchmark. The company's products have been widely used in aerospace, aviation, military, communications, LED, ships, rail transit, power, machinery, automation and many other fields.
Our company will "create a famous brand in China, provide customers with five-star services and constantly create value, and make the company become a sustainable connector manufacturer" as the vision of our pursuit!
Selection of appropriate connectors for harsh environmental applications such as industry, transportation and mining
What is the weakest link in all systems?
If you're designing for harsh environments, the weakest link is probably a low-key connector. This applies to any application requiring robust components, whether in industry, mining, transportation or any other field. In security-critical systems, any failure can be very serious and potentially fatal.
Whether connectors are used to process analog signals, digital signals or to provide power, they are an important part of all designs. In many systems, connectors must connect multiple sensors and actuators, as well as multiple subsystems.
In this article, we will introduce the environmental factors that may lead to connector failures, different types of connectors that can withstand harsh conditions (including related IP levels), and how to choose the right connector for your application without wasting too much space and cost due to specifications.
Dust-proof and moisture-proof
One of the most likely causes of connector failure is the entry of water or pollutants, such as dust or dirt. Water can enter connectors for weather reasons or when cleaning with hoses or other flowing water sources. Cleaning may also introduce chemicals or surfactants that corrode electrical conductors, thereby at least reducing their ability to transmit current and possibly causing failures.
Condensation in humid environments can also lead to moisture, especially when equipment moves from a cold environment to a warm environment. Inevitably, water and electricity do not get along well together, and the result may be a destructive short circuit.
The dirt or dust entering the connector will form an insulating layer over time, which may lead to poor connection quality of the connector. Dust or dirt can also cause overheating.
Intrusion protection (IP) is defined by IEC's IP standard IEC 605029, which has been widely used. It uses two digits to represent the protection of devices against solid objects (first digit) and liquids (second digit), as shown in Table 1.
For example, IP67 means that the device is completely dust-proof and can protect against temporary immersion in water. This protection is achieved through heavy-duty seals and gaskets, usually made of silicone resin. Multiple seals can provide redundancy, so even if a seal fails, it can maintain intrusion protection.
Table 1: IEC IP Level
In addition to IEC IP level, another commonly used intrusion protection system is the National Association of Electrical Manufacturers (NEMA)
level. IEC IP and NEMA levels are usually provided in the product data of connectors and chassis.
Other environmental hazards
In addition to dust and moisture, extreme temperatures can also cause damage to connectors, such as high temperatures encountered in many industrial processes, or high underground ambient temperatures in mining can cause extreme conditions for connectors. In many applications, the temperature from low to high frequency may also cause problems.
At temperatures below zero, there is also the need to deal with the problem of ice. When water is frozen, the volume expands, which results in great expansion force and may damage connectors and cables. Additional weight of ice can also cause stress in connectors.
When determining the connector, it is necessary to find out its extended temperature range. For example, for optical cables, Molex's LC2 metal optical connectors use metal that can withstand temperatures up to 150 degrees Celsius.
Figure 1: Molex LC2 connector. (Source: Molex)
Connectors may also be physically damaged, either by shock or by vibration, which can lead to mechanical failure or electrical connection damage. All-metal fuselage can improve the impact strength, while the thermoplastic shell can resist corrosion, and has the characteristics of flame retardant and chemical corrosion resistance.
The metal structure also ensures that the connector provides adequate protection against electrostatic discharge (ESD) and electromagnetic interference (EMI). Another mechanical design to consider is stress relief so that no force applied outside the cable or connector can be transmitted to the electrical connection. Strain elimination is a standard in many connectors.
Connectors with appropriate robustness provide the ability to be free from vibration, as defined by standards such as MIL-STD-202. For example, TE Connectivity's Celok FAS-T Gigabit Ethernet connector can withstand high vibration and reach IP67 level, operating at temperatures ranging from - 65 C to + 175 C.
Figure 2: Celok FAS-T connector for TE Connectivity. (Source: TE Connectivity)
Choose the right connector
When choosing connectors, it is self-evident that the first step is to understand the target application and possible environmental conditions. In the worst case, you can be sure that the connector can withstand any possible impact.
Once you have a specific goal, you should check all the necessary authentication such as IP67 in the connector's data manual, which also generally describes the operating temperature range. Consideration should also be given to other standards required, such as in South Africa, where the South African Bureau of Standards (SABS) has developed a number of connector-related standards.
It is recommended to select safety locking mechanisms that can withstand vibration and to provide connection validation connectors, connection validation or audible sound or tactile response. Connectors have many locking methods, so it is important to ensure that an appropriate locking method is selected, and to plan the frequency of disconnections and connections during their life cycle. Auxiliary locking (commonly referred to as wedge locking) ensures that the contacts are firmly held together.
It is important to recommend components that have been tested by relevant standards, such as MIL-STD-202, to ensure that they provide the required robustness throughout the life cycle. Standard-based testing uses techniques such as "High Acceleration Life Test" (HALT) to accurately simulate real-world conditions to ensure product reliability.
On the other hand, make sure you don't go too far. The temptation to choose connectors is to specify products of too high specifications, but this may result in unnecessary waste of cost and space due to the use of large and clumsy components. When the rating is low and the price is low, you may be tempted to have the highest IP level connector. Similarly, plastic connectors may be superior to more expensive metal connectors.
Although connectors are sometimes considered last in system design, they are indispensable and important components that require the correct selection of connector products. After considering all possible connector products, there are many options available. Perhaps your best choice is to communicate with distributors who can provide expert technical advice.
The Symposium on Five Group Standards Delivery and Revision in 2019 was held smoothly by the Electrical Connecting Components Branch of China Electronic Components Industry Association
Five group standards applied by Electric Connectors Branch in 2019 (M12 Series Push-pull Circular Connectors, General Specification for Push-pull Self-locking Small Circular Connectors with High Life, HVDC Connectors with High Voltage AC/DC Live Plug-in, Lead Frame Components of Automotive Transmission, Intelligent Lithium Battery Switching Interface) 》 All of them have completed the consultation. In order to further deepen the full and effective communication between the members of the compilation team, users and the same industry, absorb opinions from all sides, and improve the quality of standard manuscripts submitted for review as a whole, a seminar on "M12 Series Push-pull Circular Electrical Connectors" and other five group standards submitted for review, organized by the Secretariat of the branch, was successfully held in the West from 29 to 30 July 2019. Ann convened.
The meeting discussed five group standards in turn. The panel of experts was set up at the seminar, and Vice-Engineer Wang Jing of China Institute of Electronic Technology Standardization was invited to be the chairman of the panel. The other five experts were invited to be the chief experts of the five standards respectively. At the same time, the relevant users of the five standards, experts from enterprises in the same industry and members of the compilation group totaled 17 units, and 34 representatives participated in the group standard seminar.
Secretariat Secretary-General Zheng Yanhua first introduced the purpose and process of the meeting, as well as the situation of the evaluation team leader, and welcomed the arrival of the delegates. Vice-engineer Wang Jing arranged the division of labor for the chief auditing experts of each standard, and put forward the working requirements for the seminar on behalf of the experts of the evaluation group. Under the overall control of Vice-Engineer Wang Jing, the five group standards were launched in accordance with the plan in the presiding judges of five experts such as Zhu Minggaogong of the Fourth Electronic Academy. At the meeting, the chairman of the group asked the chief auditors, members of the expert group and representatives of the participants to make a thorough review and check on the rationality of the technical content of the standard, the conformity with the standard system, and the corresponding national standards, line standards and the coordination between international standards.
In the process of standard review, standard compilers introduced the basic situation of compilation and research. In a scientific, realistic and conscientious manner, the experts and representatives of the evaluation team made a detailed review of the standard compilation instructions and the standard chapter by chapter, and put forward suggestions for improvement. After a day and a half of intensive work, the discussion and evaluation of the five group standards were successfully completed, and the "opinion summary table" was formed for the revision of the standards. The Secretariat also made requests for follow-up work.
The meeting was held smoothly. The quality of the five group standards was greatly improved through the full discussion between the members of the compilation group and the representatives of users, enterprises in the same industry and the expert group's professional comments, which enabled all the delegates to have a higher and deeper understanding of the orientation and implementation significance of the group standards, and further promoted them. Actively launched the compilation and research work of the branch group standards, which laid a solid foundation for the formal technical review meeting.
With 5G support, civil UAVs will fly higher
A military UAV model displayed by a manufacturer in Chengdu at the 2019 World UAV Congress and the 4th Shenzhen International UAV Exhibition.
In recent years, UAVs have played an increasingly important role in our daily life and industrial production by virtue of their easy deployment, safety and convenience, from aerial photography to express delivery, from sky dazzling to fire fighting and cruising, from ultra-low altitude self-timer to spraying pesticides.
Fixed-wing UAVs, multi-rotor UAVs, unmanned airships, parachute-wing UAVs, flapping-wing micro-UAVs... Recently, more than 1,000 UAVs brought by more than 400 domestic and foreign UAVs enterprises have appeared collectively at the 2019 World UAV Conference and the 4th Shenzhen International UAV Exhibition. The upstream and downstream supporting industries are exhibited at the same time.
Multi-point outbreak of emerging industrial chain
In 2015, China's UAV began a large-scale expansion in various fields, known as the "first year of UAV", and the civil UAV market reached 2.4 billion yuan. Industry evaluation agencies predict that the overall market size of civil UAV products and services in China will reach 46.5 billion yuan in 2020 and 75 billion yuan in 2025, with considerable market capacity in the future.
"At present, the development status of UAV in China can be summarized as"more than three, more than two, faster". That is, more research and development units, more research and development funds, more mature products, faster technological innovation and market tracking, faster overall technical level and product quality rise. Huang Daqing, professor of UAV Research Institute of Nanjing University of Aeronautics and Astronautics, told Sci-tech Daily in an interview.
The reporter inquired on the relevant enterprise information website that the company name contains the key words of "UAV" and there are 460 enterprises currently in operation. There are more than 4000 enterprises related to the project and business scope, most of which are newly established enterprises within five years. In addition to enterprises, universities and research institutes such as Southern Airlines and Western Polytechnic University also have UAV research centers, which provide a source of power for the development of UAV technology.
More and more enterprises have realized that if they want to occupy a place in the UAV market, they must pay a lot of money for R&D investment. It is reported that nearly 25% of the employees in Dajiang, the leader of the civil UAV industry, are engaged in R&D work, with R&D investment accounting for about 15%.
The R&D input of "hard core" promotes the output of technological innovation. As of January 2019, nearly 4,000 patent applications have been filed in Xinjiang, which is also rare in the world. "As an emerging industry, the UAV industry has shown an explosive trend in terms of personnel, enterprises, research and development units, products and other aspects, and the emerging industry chain has developed rapidly." Huang Daqing said that in recent years, the technical quality of UAVs has also steadily increased, and the safety, controllability, accuracy and operating distance are also increasing. The UAV products on the market are becoming more mature, with more than 1,000 types.
Multidisciplinary Application to Divide Market Cakes
Civil UAVs can be divided into two categories: consumer-oriented UAVs and industrial-oriented UAVs. Consumer-grade products can meet people's entertainment needs, such as aerial photography, follow-up, competition and so on; industrial-grade products have gradually developed into the product pattern of "UAV + industry applications", such as patrol lines, fire protection, disaster relief, and so on, with diversified products and diversified applications.
"Agricultural plant protection UAV is the most widely used UAV in China and even in the world at this stage." Huang Daqing told reporters.
As a large agricultural country, 1.8 billion mu of basic farmland in China needs a large number of agricultural plant protection operations, such as spraying pesticides. According to statistics, there are 100,000 pesticide poisoning people in China every year, and the fatality rate is about 20%. Following the rapid development of Japan, the United States and other developed countries, in 2016, agricultural plant protection UAV has gradually become the new favorite of China's agricultural industry. According to the statistics of the Ministry of Agriculture, as of June 2016, two-thirds of the UAV companies on the market in China are plant protection UAV manufacturers, producing 178 varieties of various plant protection UAVs, with a total of more than 5,000.
Huang Daqing pointed out that after the agricultural plant protection UAV, the second most used UAV in China is mapping UAV. Every year, fine-tuning or changing surveying and mapping of urban and rural layout puts forward a large demand for surveying and mapping UAVs.
In addition, Huang Daqing said that the unmanned aerial vehicle patroled by the "air inspector" also occupies a large market and has great potential in the safety monitoring of high-voltage lines, oil/gas pipelines and fault patrol. Police UAVs are also one of the UAVs that have increased dramatically in recent years. In addition to routine surveillance, more and more attention has been paid to the monitoring of illegal UAV activities in the urban central area with dense personnel. The fifth category of UAVs, which are widely used, belongs to the logistics category. It's even less important to cross mountains and rivers and take part in the express delivery of direct routes in remote areas.
In addition to the five main industries mentioned above, the current UAV application areas include urban management such as water, gas, sewage, fire fighting, remote sensing, disaster relief, maritime inspection and other fields.
"With the rise of new technologies such as big data, artificial intelligence and 5G, civil UAV will usher in an unknown but promising future." Huang Daqing said.