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About The Design Of Terminal Blocks

2022-09-22

As a kind of connector, the terminal is an important component in the electrical industry, and it plays an irreplaceable and non-negligible role. Because engineers and technicians first check the interface, that is, the terminal, when overhauling design is particularly important.

The design of the product is a comprehensive design of product standards, materials, structures, electroplating, certification, molds, and manufacturing processes, and terminals are no exception.

(1) Product standards play a general guiding ideology, and almost all considerations are based on it. Our terminal design standards are first based on UL and CSA, but some electrical parameters can also be based on other standards, such as high Low temperature test.

Terminal Block

(2) The choice of materials directly affects the performance of the entire product and is the key to the design. Take plastic materials as an example: if the design is based on UL94 and V-0 flame retardant, it is necessary to carefully review the technology of each material property table. Whether the parameters can meet the product standards, such as whether the impact withstand voltage and aging resistance test can pass, in terms of hardware materials, the selection of TP tablet materials is particularly important, because the tablet must meet a certain conductivity (current) and It is necessary to have a certain degree of flexibility, which brings difficulties to our engineers in selecting materials, and it is precisely in this regard that connector manufacturers are pursuing the trend of elastic components. Many manufacturers of hardware materials are working hard in this regard, conductive The rate of elasticity directly affects the temperature rise and contact resistance. The quality of elasticity is related to the chemical elements, elastic modulus, hardness and tensile strength of the material. The choice of elastic modulus is calculated by the fourth strength theory formula of material mechanics. The higher the conductivity of the material, the smaller the contact resistance, the lower the temperature rise, the relationship between the insertion force and the contact resistance is a quadratic curve, the contact resistance is mainly divided into: compression resistance, film resistance, volume resistance (resistance of the conductor itself) . Among them, the film resistance accounts for 70-80% of the total resistance, which is also the main factor affecting the life of the connector. It should be given full attention. Compared with the terminal gold plating and silver plating, although the conductivity of silver is higher than that of gold, its chemical The stability is not as good as that of gold, and the film resistance caused by it is much greater than that of gold plating. Therefore, understanding the relationship between the above has guiding significance for us to select materials, and is a prerequisite for product design.

(3) The design of the product structure is also very important. This is entirely a matter of experience, and there is no shortcut. In this regard, each series has its own characteristics, such as: the screw is prevented from falling off, and the spliced product is arc-shaped at the front and back, long in length. Deformation of the number of digits, etc., shrinkage deformation caused by uneven wall thickness, etc., the main types of screw prevention are as follows: the three ribs are prevented from falling, the hoop is prevented from falling, the neck is prevented from falling off, and the stamping is prevented from falling off, due to the influence of the technical process. Neck drop prevention is not used much, and most of them use neck drop prevention. The realization of the above structure is based on the premise that the plastic material is PA66. Here we need to explain the neck drop prevention. Take the screw as M3 as an example, M3 The actual outer diameter of the screw is φ2.90mm, so the size of the shell neck should be designed in: φ2.5~φ2.6, the thickness of the shell neck should be 0.4~0.5mm, and there should be a section under the head of the screw smaller than the shell neck In order to ensure that the screw can be screwed into the thread smoothly, the production process should also be adjusted accordingly.

Terminal Block

We specialize in the production of terminal blocks, there are different types, Terminal Block and Terminal Connector. You can go to our website to browse. More Power Connectors are on sale, which can be customized according to your needs. If you are interested, you can consult us.

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