Is it better to have a multi-core cable or a single-core cable? The difference between single-core cables and multi-core cables. Power cables are generally divided into single-core, double-core and three-core cables. Among them, single-core cables refer to cables with only one conductor in one insulation layer, while double-core cables refer to cables with two conductors in one insulation layer. In fact, both have their advantages and disadvantages. For example, when the line of a single-core cable is long, when the control circuit with a large current is used or when it is laid in water, in order to prevent or reduce the middle connector, or when single-core cables have better comprehensive safety engineering than multi-core cables, single-core cables can be used.If you want to make a big difference in the market, multicore cable price It is necessary to intensify the upgrading of products on the original basis in order to meet the consumption needs of consumers. https://www.linkcablecn.com

　　Is it better to have a multi-core cable or a single-core cable?

　　1. From the current point of view, the current passing through a multi-core cable with the same cross-sectional area is relatively larger than that of a single-core cable, and the load is large.

　　2. From the perspective of power loss, the two ends of the single-core cableare directly grounded, and the metal shielding layer of the cable may also generate circulating current that can reach the current carrying capacity of the cable, which wastes power and forms loss. Multi-core cables are generally three-core cables, because during the operation of the cable, the sum of the currents flowing through the three cores is zero, and there is basically no induced voltage at both ends of the cable metal shielding layer.

　　3. From the perspective of cost, among the wires of the same cross-sectional area, the cost of single-core cables is cheaper than that of multi-core cables, and multi-core cables are slightly more expensive.

　　4. From the perspective of installation, single-core cables appear harder when passing through pipes, while multi-core cables are softer and easier to wire.

　　Multicore Flexible Cables.jpg

　　Multicore Flexible Cable.jpg

　　The difference between single-core cables and multi-core cables

　　2-core cables: When the neutral line of 1kv and below power supplies is directly grounded, the number of cable cores of the single-phase control circuit should be 2-core cables when the maintenance line and the neutral point share the same conductor. For control circuits that can be powered by DC, 2-core cables should be used.

　　3-core cable: When the neutral line of 1kv and below power supply is directly grounded, the number of cable cores of the single-phase power control circuit is: When the protection line and neutral point are separate, it is advisable to use a 3-core cable.

　　4-core cable: 1kv and below 4-core cable (3+1 cable), in which the fourth core is used as a grounding protection, and also carries the unbalanced current and short-circuit capacity of the power supply system. (To learn more about cable technology, please click here, a lot of dry goods are waiting for you) Its size is determined by the unbalanced current and short-circuit capacity, but generally cannot be less than 1/2 of the phase line.

　　5-core cable: 1kv and below three-phase four-wire distribution room system, some electrical equipment distribution lines with higher safety requirements, and some communication centers and automation equipment that must ensure power safety and anti-interference grounding, it is advisable to use 5 copper core cable TN-C distribution room system, so that the protection line (PE line) and neutral point (PN line) are independent, and the cable core section is generally 3 large and 2 small or 4 large and 1 small or 5 large.

　　Multicore Flexible Cable supplier.jpg

　　The difference between 4-core cable and 3+1 core cable: 1kv and below three-phase four-wire distribution room system, when the protection line and neutral point share the same conductor, 4-core cable should be used, and the method of 3-core cable plus single-core cable to form a circuit cannot be used, or even the method of directly using the metal sheath or armored cable layer of 3-core cable as the neutral point. Otherwise, when the 3-phase current is unbalanced, it is equivalent to the operation of a single-core cable, which is easy to cause DC interference.

　　A mechanical keyboard is a keyboard that uses mechanical switches. It is different from a traditional membrane keyboard in terms of key structure and touch. This article will explain the basic structure of a mechanical keyboard.As a representative of the industry, aula gaming keyboard It is necessary to set a certain example for peers and lead the way in product quality. https://www.aulastar.com/

　　Composition of mechanical keyboard

　　What are the main parts of a mechanical keyboard?

　　AULA F98 PRO Custom Mechanical Keyboard

　　Mechanical keyboard mainly consists of the following six parts:

　　1. Keycap: The keycap is the outermost part of a mechanical keyboard and is usually made of plastic. The keycap is marked with characters or icons to indicate the function of the key.

　　2. Shaft: The shaft is the most important part of a mechanical keyboard. It is located under the keycap and is responsible for converting key operations into electrical signals. Mechanical keyboards use different types of shafts, such as blue shaft, red shaft, brown shaft, etc. Each shaft has a unique trigger force, trigger sound, and trigger method.

　　3. Spring: The spring is located inside the shaft and restores the key to its original state by providing elastic force. When the key is pressed, the spring is compressed, and when the key is released, the elastic force of the spring causes the key to bounce. The material and strength of the spring will affect the rebound force and feel of the key.

　　4. Key shaft: The key shaft is the part that connects the keycap and the shaft body. It realizes key triggering by transferring force between the keycap and the shaft body. The key shaft is usually made of plastic or metal, which has certain durability and stability.

　　5. Circuit board: The circuit board of the mechanical keyboard carries the circuit and chip of the keyboard and is responsible for transmitting the key trigger signal to the computer. The circuit board may also contain other functional components, such as LED lights, encoders, etc.

　　6. Shell: The shell is the protective structure of the mechanical keyboard, usually made of plastic material. The shell protects the internal components of the keyboard and provides a comfortable feel and appearance design.

　　Anti-loosening nut is a nut, which is a part that is screwed together with a bolt or a screw for tightening. It is an original part required by all production and processing equipment. Anti-loosening non standard nut is a part that tightly connects mechanical equipment together. With the help of the inner thread, anti-loosening nuts and screws of the same specifications can be connected together. The following is a detailed introduction to several methods of preventing anti-loosening nuts from slipping.for a long time non standard fasteners It has an extraordinary development speed, and I believe that the future will be as overwhelming as ever. https://jieruifasteners.com/

　　1. Anti-loosening of equipment

　　It is to use the locking nut stopper to directly limit the relative rotation of the locking nut pair. For example, the use of tooth pins, serial wires and stop washers. Because the locking nut stopper does not have a pre-tightening force, the anti-loosening stopper can only work when the locking nut is loose and returned to the stop position. Therefore, the locking nut method does not actually prevent loosening but prevents falling.

　　2. Riveting and anti-loosening

　　After tightening, use punching, welding, bonding and other methods to make the locking nut pair lose the performance of the kinematic pair and the connection becomes an irremovable connection. The disadvantage of this method is that the bolt rod can only be used once, and it is very difficult to disassemble, and the bolt pair needs to be damaged before it can be disassembled.

　　3. Friction anti-loosening

　　It is the most widely used anti-loosening method. This method forms a positive pressure between the locking nut pairs that does not change with the external force, so as to form a friction force that can prevent the relative rotation of the locking nut pairs. This positive pressure can be achieved by axially or simultaneously pressing the locking nut pairs in two directions. For example, elastic washers, double nuts, self-locking nuts and insert locking nuts are used.

　　4. Structural anti-loosening

　　It is to apply the locking nut pair’s own structure, that is, the Tang’s locking nut anti-loosening method.

　　5. Punching edge anti-loosening

　　After the nut is tightened, the thread is destroyed by punching the end of the thread; bonding anti-loosening generally uses anaerobic adhesive to apply to the thread screw surface. After tightening the anti-loosening nut, the adhesive can solidify by itself, and the actual anti-loosening effect is better. The disadvantage of this method is that the bolt rod can only be used once, and it is very difficult to disassemble, and the bolt pair needs to be destroyed before it can be disassembled.

　　In late July 2024, the global Internet was reporting news related to the Paris Olympic Games. Many problems occurred during the preparation of the Paris Olympic Games by the French government, which led to the loss of confidence in the security of Paris during the Paris Olympic Games. It is reported that foreign athletes also brought private bodyguards to France during the Paris Olympic Games, afraid of personal security risks in France.In some cases, business bodyguard The advantages will become more and more obvious, and it will be able to develop indomitable after market tests. http://huanyubodyguard.com/

　　paris olympics

　　During the preparation and organization of the Paris Olympic Games in France, there were indeed riots such as workers’ strikes in Paris. Some workers involved in the construction of the Paris Olympic Games project demanded an increase in wages and benefits and confronted the government, and staged a battle of workers’ police in the streets of Paris. In addition, many illegal immigrants also took the opportunity to threaten the French government to give them legal residency status, or illegal immigrants will stop participating in the construction of the Paris Olympic Games. For this, the French government has had to compromise.

　　Many foreign athletes saw the news of the riots in Paris, France, and felt worried about the security in Paris, France, so it came out that foreign athletes with private bodyguards went to Paris, France, these messages are not necessarily true, but also reflect the various practical problems during the Paris Games. There is also news that the Chinese sports team to France also brought private security teams, such as China’s Shenzhen Huanyu Brothers bodyguard company and other security service teams, which are said to be the security partners of the Chinese sports team participating in the Paris Olympic Games. But this information is hard to verify.

　　As a highly civilized capitalist country, France’s performance during the Olympic Games has surprised many foreigners, and foreign athletes worry about their safety in Paris, not joking, indicating that there are many security risks in Paris, France. The French city of Paris, which is prone to strikes, demonstrations and vandalism of public facilities, is no longer what it used to be, and it is natural for foreign athletes to have safety concerns.

　　Reversing camera is an invaluable tool for drivers. It is a good idea to use a reversing camera while driving.In addition to domestic, car camera manufacturer It has also emerged in the international field and gradually gained the favor of more foreign friends. https://szdfpls.com

　　It can help you park safely, and its wide-angle lens allows you to see anything behind you in your rearview mirror.

　　You can also see children, trash cans, and toys. In general, using a back-up camera can also make driving easier.

　　Some cameras will even signal a warning when approaching a parked car or nearby object. Reversing cameras can help you avoid accidents and potentially save your life.

　　D-SUB connectors, recognized for their distinctive “D” shaped metal shield and array of pin configurations, are versatile components used in a range of electronic applications. Their design not only ensures a reliable connection but also provides robust protection against interference. Here’s an overview of their primary uses:The industry believes that, D-SUB connector The development of our company marks the rapid and steady progress of the whole industry. https://www.xpbdz.com/

　　1. Serial Communication

　　One of the most common applications of D-SUB connectors is in serial communication. For decades, the DB9 and DB25 connectors have been standard for RS-232 serial ports. These connectors facilitate data transmission between computers and peripheral devices such as modems, printers, and serial communication equipment. The DB9, with its 9 pins, is particularly popular for its compact size and reliability in serial data exchange.

　　D-SUB connectors

　　2. Parallel Communication

　　D-SUB connectors are also widely used for parallel communication, primarily through the DB25 connector. This type of connection allows for multiple data lines to be used simultaneously, enhancing data transfer speeds. DB25 connectors are frequently found in parallel ports for printers and other devices that require fast, bulk data transfers.

　　3. Video and Display Connections

　　The DE15 variant of the D-SUB connector, often referred to as the VGA connector, is a staple in video and display applications. The VGA connector supports analog video signals, making it essential for connecting computer monitors, projectors, and other display devices. Despite newer digital display standards emerging, VGA remains widely used in various legacy systems.

　　4. Industrial Equipment

　　In industrial environments, D-SUB connectors are valued for their durability and resistance to interference. They are commonly employed in machinery control systems, industrial automation, and data acquisition systems. The robust design of D-SUB connectors ensures reliable connections even in challenging conditions.

　　5. Networking and Data Communication

　　D-SUB connectors are utilized in networking applications, particularly in legacy networking hardware and certain network interface cards (NICs). They facilitate the connection between networking equipment and data transmission networks, supporting tasks like network configuration and diagnostics.

　　D-SUB connectors

　　6. Audio and Video Equipment

　　Some D-SUB connectors are used in professional audio and video equipment. They can provide multi-channel audio connections and video input/output options, catering to high-quality audio and video setups in both commercial and home entertainment systems.

　　7. Test and Measurement

　　In test and measurement applications, D-SUB connectors serve as interfaces for connecting test equipment, sensors, and data loggers. Their versatility and reliability make them suitable for collecting and transmitting data in various testing scenarios.

　　Conclusion

　　D-SUB connectors offer a broad range of applications, from serial and parallel communication to video and industrial use. Their versatility, durability, and reliability have made them a staple in many electronic and industrial systems. Despite the rise of newer technologies, D-SUB connectors continue to play a crucial role in connecting devices and ensuring effective data transmission.

　　As an important material for power transmission, flexible cables are widely used in various fields. However, it is very important to choose the right flexible cable. Today, I will introduce how to choose a suitable flexible cable, and provide guidance from the aspects of materials, structure, environment, etc. to ensure safe, stable and efficient power transmission.In order to open the market, shielded twisted pair cable Constantly improve the ability of business development and create an extraordinary brand image for it. https://www.linkcablecn.com

　　When choosing a flexible cable, the first thing to consider is material selection. Common flexible cable materials include copper conductors, polyvinyl chloride (PVC) insulation, etc. Copper conductors are usually selected as high-quality conductive materials, while PVC insulation has good fire resistance, wear resistance and flexibility. In addition to the above materials, there are other materials to choose from, such as low-smoke zero-halogen (LSZH) materials, which can reduce the release of smoke and harmful gases. It is very important to choose the right flexible cable material according to the specific application requirements and environmental conditions.

　　The choice of flexible wire structure is also a key factor in choosing the right power transmission needs. According to the application requirements, single-core, multi-core or shielded flexible cables can be selected. Single-core cables are suitable for single power transmission, and multi-core cables are suitable for multi-power or signal transmission. Shielded flexible cables have anti-interference characteristics and are suitable for environments that require stable signal transmission. In addition, the conductor cross-sectional area of the flexible cable should also be selected according to the load requirements to ensure the stability and efficiency of power transmission.

　　The environmental adaptability of the flexible cable is also an important consideration in selecting a high flexible cable. Different application scenarios may face different environmental conditions, such as high temperature, low temperature, humidity, corrosion, etc. Therefore, when selecting a flexible cable, the temperature resistance, weather resistance and corrosion resistance of the cable should be considered. Flexible cables that adapt to the environment can ensure the stability and safety of power transmission.

　　When selecting a flexible cable, the reliability of the cable should also be considered, whether it has passed the corresponding certification. Reliability includes the durability, tensile strength, insulation performance, etc. of the cable. In addition, CE certification, UL certification and RoHS certification are important signs for judging the quality of the cable and meeting environmental requirements. Choosing a certified flexible cable can ensure the stability and safety of power transmission.

　　Choosing a suitable flexible cable is the key to ensuring the safety, stability and efficiency of power transmission. When selecting a flexible cable, the material selection should be comprehensively considered, the structure selection, the environmental adaptability selection, the reliability certification and other factors. According to the specific application requirements and environmental conditions, select a flexible cable with good conductivity, durability and environmental adaptability. By choosing the right flexible cable, you can ensure the quality and reliability of power transmission and improve the efficiency and safety of the power system. When choosing a flexible cable, it is recommended to refer to professional power transmission standards and consult Changyu cable manufacturers to ensure that you choose the right flexible cable to meet specific power transmission needs.

　　In daily life, keyboard is a relatively important thing. Whether you are working or playing games, keyboard is indispensable. A good-looking keyboard can bring a different use experience, at least it looks more comfortable at first glance. Mechanical keyboards have different axes, which can bring different typing experiences and meet most of the needs of different groups of people for keyboards. Therefore, more and more people use mechanical keyboards in recent years. When boys buy things, they may look at the performance at first glance, but girls may look at the appearance at first glance. However, in order to prevent girls from missing out on easy-to-use mechanical keyboards, there are many keyboards that have girls’ aesthetics, high appearance, and practical mechanical keyboard products.From the demand side, aula mechanical keyboard More in line with the psychological expectations of consumers, willing to pay for the things they like. https://www.aulastar.com/

　　What are some good-looking keyboards that girls would also like to recommend?

　　AULA F98Pro

　　AULA F98Pro wireless Bluetooth three-mode customized keyboard, white, black, cherry pink color, high appearance, stylish and individual. Cool RGB lighting effect, 16 million colors for you to choose, anyone who sees it will love it. This keyboard adopts a three-mode design, which can connect to multiple devices at the same time, making operation more convenient. The surface of the keyboard is frosted, comfortable to the touch, and not easy to fatigue after long-term use. The keyboard uses a white transparent ice crystal axis, which has a smooth touch and comfortable operation, suitable for office and game use. The keyboard has a variety of shortcut keys for user convenience. The keyboard comes with a backlight function, which is more convenient to use at night. In addition, this keyboard also supports customized settings, which can be adjusted according to personal preferences to meet personalized needs. In addition, this keyboard also has a powerful waterproof function, so there is no need to worry about liquid splashing into the keyboard, which extends the service life of the keyboard. Whether it is office or game, it can meet user needs.

　　Cold heading is a common process for manufacturing the heads of fasteners such as bolts, screws, pins, rivets, etc. In many cases, heading is actually a type of cold heading. Cold heading is a forging method that uses a die to compress and shape metal bars at room temperature.From some points of view, non-standard fasteners price It is the core driving force to better promote the rapid development of the surrounding markets. https://jieruifasteners.com/

　　The specific operation process is to put the metal bar into the cold heading machine and extrude it into shape through pressure. During the extrusion process, the metal bar will undergo plastic deformation, thereby changing its shape and size, and the head of the fastener will be formed.

　　In the field of fastener manufacturing, cold heading process is widely used because of its following characteristics:

　　1. Cold heading process can be carried out at room temperature without heating metal materials.

　　2. Cold heading process can reduce or replace cutting processing and improve material utilization.

　　3. Cold heading machine models and series are complete, suitable for various bolts and nuts forming, equipment performance is reliable, high efficiency, stable quality.

　　4. Cold heading machine can realize continuous, multi-station, automatic production, simple operation, suitable for mass production.

　　The cold heading process can improve the surface finish of the workpiece and ensure the accuracy of the workpiece, and can manufacture high-precision, high-strength bolts, nuts, etc.; the cold heading process can improve the mechanical properties of the workpiece, such as increasing the density and hardness of the material, thereby improving wear resistance and corrosion resistance. In general, the cold heading process can improve productivity, ensure the quality of fasteners, reduce material loss, and reduce production costs. It is increasingly widely used in the production of standard fasteners.

　　According to a US news media report, the US Silicon Valley bosses spend more than one million dollars a year on personal security costs of investment, these Silicon Valley bosses, are keen to hire private bodyguards, of which Zuckerberg’s private security costs are the top investment among US technology company executives, reaching tens of millions of dollars. Security for people like Bezos costs about $1.6 million a year.Since then, more and more people have found that female bodyguard The value of, thus affecting the choice of many people. http://huanyubodyguard.com/

　　private bodyguards

　　Like tech executives in the United States, Chinese tech executives also employ private bodyguards, like the former celebrity Jack Ma, who has elite bodyguards dedicated to providing him with security services and is rumored to be a low-key martial arts master who knows traditional Chinese martial arts. Most Chinese tech executives are surrounded by bodyguards who know kung fu skills like boxing, free combat, kickboxing, Brazilian jiu-jitsu, can drive a car, can dive, know basic business etiquette, and know technical reconnaissance skills. Some of the bodyguards employed by China’s technology giants are from professional bodyguard units such as the Huanyu Brothers Bodyguard Company in Shenzhen, China, and some are security personnel of the security department established by the company’s senior executives.

　　private bodyguards

　　In fact, not only the big men of Silicon Valley and Chinese technology companies have to take private bodyguards around them, but also the executives of many technology companies around the world will take private bodyguards, such as some company executives in India, Japan, and South Korea, when they travel, they have professional security services. It’s just that most of the world’s tech executives don’t spend as much on bodyguards as Mr. Berg does. However, hiring bodyguards has become the security consensus of world-class science and technology leaders, their social value and economic value is extremely high, once there is danger, the loss is immeasurable, so these people go where they will take private bodyguards.