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Question Standard for salt spray test of terminal blocks 2011-12-12 12:15:59

Terminal blocks are widely used in household appliances, automobiles, computers and other fields, among which the canned terminal blocks have no characteristics. Terminal block refers to a series of combined wiring fixtures in electrical engineering. The number of terminal points in each row is different, and its model can be determined according to the needs of engineering technical parameters. The application of terminal blocks is mainly reflected in: in the power electronic wiring, when the equipment inside the screen is connected with the equipment outside the screen, some special terminal blocks must be used. These terminal blocks are called terminal blocks when they are combined. Terminal block is a kind of accessory product used to realize electrical connection, which is divided into connector category in industry. With the increasing degree of industrial automation and the increasingly strict and accurate requirements of industrial control, the use of terminal blocks has gradually increased. UK terminal block has universal mounting feet, so it can be installed on U-shaped guide NS 35 and G-shaped guide NS 32. 1.2. Closed screw guide holes ensure ideal screwdriver operation.
1. The performance of tinned terminals is very stable, and they are not easily affected by geographical location, and the service life of tinned terminals is very long. The tinned terminal has a high frequency when switching, and the loss caused by the control signal is very small, which can greatly reduce the probability of failure.
2. The tin terminals with the functions of shockproof, self-locking and anti loosening make the use environment of tin terminals more extensive.
3. Tin plated terminals have good air tightness and corrosion resistance, and are easy to handle corrosive gas environment.
4. The daily management and maintenance of all copper tinned terminals is very simple. Just clean the ground near the tinned terminals.
Many friends do not understand how long it takes to do salt spray detection on the can terminals.
The connection terminal adopts the existing screw connection technology of rail terminal frame, and is connected with the circuit composed of electronic components to realize the transmission coupling of optoelectronic technology.
The terminal block has the advantages of high switching frequency, no mechanical contact jitter, no wear switching, high insulation voltage, no fear of vibration, no geographical location impact and long life under the loss of control terminal signal. Therefore, the terminal block is widely studied and applied in the field of automatic management control technology.
The terminal products have good appearance specifications, good conductivity and safety. It is widely used in transformer, voltage regulator, generator, communication cable and many other fields.
With the rapid development of electronic industry, the application scope and types of terminal blocks are more and more extensive. In addition to PCB terminals, there are hardware terminals, nut terminals, terminals, etc.

Question What are the quality requirements for the components of the terminal block 2011-12-12 12:15:59

In terms of management of hardware production materials, it is necessary to conduct current and have a flexible part, such as the lamination of terminal blocks. The quality of materials can directly affect the electrical system performance and connection technical performance of terminals. It plays an important role in the connection of electrical equipment. The design of terminal blocks is an important economic factor to determine the quality of terminal blocks. Terminal block is a kind of accessory product used to realize electrical connection, which is divided into connector category in industry. With the increasing degree of industrial automation and the increasingly strict and accurate requirements of industrial control, the use of terminal blocks has gradually increased. With the development of the electronic industry, terminals are used in more and more areas, and more and more types. In addition to PCB board terminals, hardware terminals, nut terminals, spring terminals, etc. are most widely used. Terminal block refers to a series of combined wiring fixtures in electrical engineering. The number of terminal points in each row is different, and its model can be determined according to the needs of engineering technical parameters. The application of terminal blocks is mainly reflected in: in the power electronic wiring, when the equipment inside the screen is connected with the equipment outside the screen, some special terminal blocks must be used. These terminal blocks are called terminal blocks when they are combined. Because the conductivity of these materials directly affects the temperature rise and contact resistance, the elasticity is related to the development of chemical structural elements, elastic modulus, hardness and tensile strength of the materials. The greater the conductivity of the materials, the smaller the temperature rise will be, and the plugging force and contact resistance will form a quadratic function curve.
The main surface of the terminal is mainly plastic mold and metal continuous mold.
CTI parameters must meet the requirements during design, which directly affects whether the final product can pass the tests of impulse voltage resistance and aging resistance. According to UL regulations, no more than 25% of the backwater materials can be used together with 75% of the new materials after they are fully mixed. Especially for some products that can withstand high current and high voltage, the use of backwater materials should be low or not filled.
In electroplating technology, the electroplating layer and film also directly affect the main economic factors of terminal life. As far as gold plating and silver plating are concerned, the conductivity of silver is higher than that of gold, but its chemical structure stability is not as good as that of gold. The resulting film resistance is far less than that of gold plating. However, the cost of gold plating is high. It is recommended that we only use products with acid environment problems or worse application and development environment to use electrogilding. In addition, local gold plating is used for different parts of the contact between the pressing pieces, which not only ensures that the network performance analysis of enterprises can be effectively improved, but also greatly reduces the production cost of products.

Question Selection and purchase method of terminal blocks 2011-12-12 12:15:59

The quality of terminal blocks is determined by plastic insulating materials and conductive parts, which can be studied to determine the insulation technical performance and conductive performance of terminals respectively. With the development of the electronic industry, terminals are used in more and more areas, and more and more types. In addition to PCB board terminals, hardware terminals, nut terminals, spring terminals, etc. are most widely used. Terminal block refers to a series of combined wiring fixtures in electrical engineering. The number of terminal points in each row is different, and its model can be determined according to the needs of engineering technical parameters. The application of terminal blocks is mainly reflected in: in the power electronic wiring, when the equipment inside the screen is connected with the equipment outside the screen, some special terminal blocks must be used. These terminal blocks are called terminal blocks when they are combined. UK terminal block has universal mounting feet, so it can be installed on U-shaped guide NS 35 and G-shaped guide NS 32. 1.2. Closed screw guide holes ensure ideal screwdriver operation. Any failure as a system terminal will bring great threat to the personal and property information security management of enterprise owners. Similar painful lessons have been learned in domestic and international development.

Question The quality and reliability of terminal blocks are more practical 2011-12-12 12:15:59

From different perspectives of use, the function of the terminal block should be: the local government that contacts the conductive part must be conductive and reliable. UK terminal block has universal mounting feet, so it can be installed on U-shaped guide NS 35 and G-shaped guide NS 32. 1.2. Closed screw guide holes ensure ideal screwdriver operation. Terminal block is a kind of accessory product used to realize electrical connection, which is divided into connector category in industry. With the increasing degree of industrial automation and the increasingly strict and accurate requirements of industrial control, the use of terminal blocks has gradually increased. With the development of the electronic industry, terminals are used in more and more areas, and more and more types. In addition to PCB board terminals, hardware terminals, nut terminals, spring terminals, etc. are most widely used. Local enterprises that should not be connected to the insulating parts must be insulated reliably. There are three main types of common fatal faults of terminal blocks:
1. Poor contact
The metal conductor inside the terminal is the core part of the terminal, which transmits the voltage, current or signal information from the wires or cables outside the enterprise to the contact corresponding to the connector. Therefore, the contact must have an excellent structure, stable, safe and reliable contact social retention and good conductivity. Due to the unreasonable design method of the student contact structure system, some mistakes can be made in the selection of materials, unstable molds, out of tolerance size of processed products, rough surfaces, unreasonable surface analysis and treatment technologies such as heat treatment and electroplating, improper assembly, poor storage and use of different environmental conditions, and improper use and management of operators, all of these will cause poor direct contact at the contact parts and mating parts of our contacts.
2. Poor insulation
The function of the insulator is to keep the contacts in a correct position for arrangement, and to make the insulation between the contacts and between the contacts, and between the contacts and the shell structure can affect each other. Therefore, insulating parts must have these excellent electrical system performance, mechanical equipment performance and process design molding technology performance. Especially in China, with the extensive research and use of high-density and miniaturized terminal blocks, the effective wall thickness of the insulator is getting thinner and thinner. This puts forward stricter requirements for insulating materials, injection mold processing accuracy and molding production process. As there are some metal residues on the surface or in the internal management of the insulator, the surface dust, welding flux and other pollutants are affected with moisture, the organically bound material precipitates and harmful gases form an ionic conductive channel through the fusion of the adsorption film and the surface water film, moisture absorption, mold growth, aging of insulation materials and other reasons will directly cause short circuit, electric leakage, breakdown, low insulation resistance and other adverse social phenomena of insulation.
3. Poor fixation
Insulators not only act as insulation, but also usually provide precise pairing and protection for protruding contacts, and also have the functions of positioning, locking and fixing equipment. Poor fixation, light affects contact reliability and leads to instantaneous power loss, which is seriously caused by product decomposition. Separation refers to the abnormal separation between plugs and sockets due to material, design, process and other reasons, which leads to unreliable structure and serious consequences of power transmission and signal control interruption of the control system. Poor fixation will be caused by unreliable design, incorrect material selection, improper molding process selection, heat treatment, mold, assembly, fusion and other process quality, and improper assembly.
In addition, the appearance is poor due to the analysis of coating peeling, corrosion, bumping, plastic shell flash, cracking, rough processing of contacts, deformation and other causes; poor interchangeability may be caused by factors such as poor market positioning, poor locking fit, poor product quality consistency, and excessive total separation force, which is also a common and frequently occurring disease. These faults can be found and eliminated in a timely manner in the process of inspection and use management.
In a sense, preventing failure is more important than analyzing it. It is of more practical significance to ensure the quality and reliability of terminal blocks.

Question Identification methods and precautions of terminal blocks 2011-12-12 12:15:59

Terminals are components that connect the battery and the external conductors. With the development of the electronic industry, terminals are used in more and more areas, and more and more types. In addition to PCB board terminals, hardware terminals, nut terminals, spring terminals, etc. are most widely used. Terminal block refers to a series of combined wiring fixtures in electrical engineering. The number of terminal points in each row is different, and its model can be determined according to the needs of engineering technical parameters. The application of terminal blocks is mainly reflected in: in the power electronic wiring, when the equipment inside the screen is connected with the equipment outside the screen, some special terminal blocks must be used. These terminal blocks are called terminal blocks when they are combined. UK terminal block has universal mounting feet, so it can be installed on U-shaped guide NS 35 and G-shaped guide NS 32. 1.2. Closed screw guide holes ensure ideal screwdriver operation. In electrotechnics, terminals refer to wiring terminals, also known as wiring terminals, which are divided into single hole, double hole, socket, hook, etc And from materials, copper and silver electroplating, copper and zinc electroplating, copper, aluminum and iron electroplating. Their main function is to transmit electrical signals or conduct electricity.
The welding pin for terminal piercing must be able to accurately position in the market, select appropriate size, place evenly, and have a good weldability, which is not only conducive to students' insertion and welding. In the whole enterprise assembly design process, we must withstand the impact of high temperature environment generated by heat treatment technology. In welding, we mainly study the use of infrared preheating and convection preheating to transfer heat to the solder pin and tin disk interface to melt solder paste. The anti fusion welding performance of the contact is poor. When the starting motor or the circuit is short circuited, the high current makes the contact. The head is firmly welded and cannot be released, and the pure silver contact is easier to be fused. The main contact of AC contactor shall be silver base alloy with strong resistance to fusion welding, such as silver iron, silver nickel, etc. In the optical network communication (transmission) line, different management modules are implemented for China. There is a need for flexible and effective connection between equipment and system development. There must be a device that can not be disassembled to connect the information between optical fiber and optical fiber structure, so that the optical path can be analyzed and transmitted according to the required channel data to achieve and complete the intended or expected purposes and requirements of the project. Devices that can achieve this social function are called connectors.
Terminal identification method
One or more of the following methods can be used to identify equipment terminals and specific wire terminals. The marking system of relevant products shall be used to determine and identify the actual or relative position of equipment terminal blocks or specific wire terminals. The marking system of relevant products shall be used to determine and identify the color marking of equipment terminal blocks and specific wire terminals.
The magnetic system of the terminal block has no air gap and the remanence is too large. File off part of the pole surface at the residual gap to make the gap 0.1-0.3mm, or parallel a 0.1 uf capacitor at both ends of the coil. After a period of use, the surface of the active contactor core is oily or greasy. The rust proof grease on the iron core surface shall be clean, and the iron core surface shall be flat, but not too light, otherwise it is easy to cause delayed release. During the whole assembly process, it must withstand the high temperature in the preheating area and the temperature transmitted to the terminal block through wave soldering. The flux shall not affect the terminal blocks, and shall be easy to disassemble without leaving any residue. The entire assembly process must be washable. It is not uncommon for the preheating temperature to reach 100 ℃ or above and the wave crest to reach 280 ℃.
Through the introduction of the article, have you mastered the identification methods and precautions of terminal blocks? I hope this article can help you.

Question What are the usage scenarios of spring type PCB terminal blocks 2011-12-12 12:15:59

As the name implies, spring type PCB terminals are used in conjunction with circuit boards. Compared with screw terminals, they are convenient and easy to install wires. Their advantages are very clear. They are selected by more and more industries that need electronic elements such as integrated circuits, ranging from electronic watches and calculators to computers, communication electronic equipment and even military equipment.
The production of spring type PCB terminal blocks is by no means a simple assembly. Because it needs to match with the printed circuit board, the size, spacing and quality of solder legs are crucial, so the requirements for the product's own solder pin process are very high. In addition to fixing various small parts, it provides mechanical support for fixed assembly of various electronic components such as integrated circuits, realizes wiring and electrical connection or electrical insulation between various electronic components such as integrated circuits, and provides required electrical characteristics, such as characteristic impedance.
When spring type PCB terminal blocks are usually connected, we should pay attention to the selection of voltage and current. If the voltage and current are too high, it will damage the circuit board. Therefore, we need to select appropriate bearing products when selecting PCB terminal blocks. There are many types of such terminals, and different incoming lines can be selected. The height of the second and third layers can save installation space.

Question How to select the terminal blocks? 2011-12-12 12:15:59

The choice of terminal blocks has always been a hot topic! Only some product parameters, or even no parameters, are purchased. Buying terminal blocks is a headache. Let's take a look. How can we choose?
First of all, before selecting the type, you should know what kind of terminal block you want.
According to the functions of terminals, they are: common terminal, safety terminal, test terminal, grounding terminal, double layer terminal, double layer terminal, three layer terminal, one in two out terminal, one in three out terminal, double in two out terminal, circuit breaker terminal, overvoltage protection terminal, sign terminal, etc.
Classified by current: small current terminal, large current terminal, etc. According to the appearance, it can be divided into guide rail terminal, fixed terminal, PCB terminal, etc.

Question What should be paid attention to when selecting terminals? 2011-12-12 12:15:59

I. Current requirements
The current requirements can be said to be an important aspect to consider for the terminal, because the current exceeding the rated requirements will lead to terminal heating, and overheating temperature may damage the terminal. Therefore, when selecting terminal blocks, it is necessary to ensure that the selected terminal blocks have high current processing requirements. If the application requires an expected rated current of 2A, it is sufficient to select a terminal with a rated current of 3A.
2、 Voltage requirements
The voltage requirement is also a problem that needs to be considered for the terminal, because the voltage will cause the dielectric breakdown problem, so that the high voltage of the terminal may cause the current leakage between adjacent terminals. Although high voltage requirements are rarely seen in design, which is why voltage considerations are usually ignored when the voltage is lower than 100V, it is very important to check voltage parameters before selecting terminals.
3、 Environmental performance requirements
When selecting terminal blocks for connectors, environmental factors are important issues to consider. Because environmental factors such as high temperature and vibration will affect the performance of terminal blocks, it is necessary to ensure that terminal blocks have high mechanical strength and good environmental performance.

Question How to select appropriate terminal blocks? Mainly look at these six points 2011-12-12 12:15:59

Terminal blocks help us to realize electrical connection and make wire connection more convenient. However, when using, it is not allowed to make blind selection. Proper and correct terminal blocks should be selected. Specifically, the selection should be based on the following points:

Question What are the classifications of terminal blocks 2011-12-12 12:15:59

Plug in components
Fence type components
Spring type components
Rail mounted components

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