Low Voltage Withdrawable Switchgear

Low-voltage switchgear structure

Fixed type: It can meet the requirements of the electrical components to be reliably fixed in the determined position in the cabinet. The inside of the cabinet is completely installed. Special tools should be used to replace components and the connected parts should be disassembled. The appearance of the cabinet is generally cubic, such as a box type.

2. Processing method

(1) Welding type: The traditional welding process is used to connect the related parts firmly by welding. Its advantages are convenient processing, strong and reliable; the disadvantages are large errors, easy deformation, difficult adjustments, and poor aesthetics. It is inconvenient to refurbish in the later stage, and it is more difficult when the cabinet is large during plating, and the welding process and the basic skills of the cabinet processing personnel are high.

(2) Fastener assembly connection: its advantage is that it is suitable for regular processing of workpieces, pre-plating, easy to change and adjust, easy to beautify, parts can be standardized design, and can be pre-production inventory, frame size error is small, and it occupies space small. The disadvantage is that it is not as strong as welding, requires high precision of parts and components, and the processing cost is relatively increased.

In the form of cabinet processing, different standard cabinet types have been determined by their respective standards, and some are not specified, we have to consider the characteristics of his components and the basic principles of electrical design. Considering large and heavy components, the welded structure is preferred. The replacement and variability of the site and components are considered to be assembled. The overall requirements are not high in accuracy and there are few components, or the box-type structure is considered to be a welded structure with more components. Uncertain, the variability in the design process is relatively large. Consider the assembly type, consider the user’s site requirements for high-end, more beautiful and often disassembled (experimental cabinet) consider the assembly type, and with the development of the times and the requirements of environmental protection, we Minimize the use of welding processes to meet the requirements of environmentally friendly products. Of course, the convenience and economy of processing must also be considered. Welding is convenient, fast and economical. Sometimes it is necessary to combine the two forms to design the cabinet structure and craftsmanship. When designing the cabinet, you must consider external factors and your own conditions. For example, if you design a welding process that is two-sided welding of two thin plates below 0.8mm, it needs a welding technician above level 6 to complete it. We don’t have this. Therefore, other types of talents must use other forms, such as double-sided welding, internal butt joints, etc. The accuracy of our processing equipment is 0.5mm, so you can't design a socket size that requires an error of 0.1mm, and at the same time, it must be based on product characteristics. , Do not go beyond the scope of the process guidelines of the cabinet itself to formulate the process, of course, we must also give play to the advantages of our equipment personnel.

In addition to the design of switch cabinets according to the characteristics of different types of cabinets and electrical specifications, the manufacture of switch cabinets also involves sheet metal processing, mechanical manufacturing and material mechanics technology, as well as the specifications of the industry. For example, in terms of material structure, in addition to the standard specifications and user requirements of different cabinet types, we also need to follow the actual needs of the cabinet, the location of the parts, the external environment where the cabinet or components are located, installation and transportation, and processing methods. Equipment, etc. should also consider economic benefits. For example, a mounting part with a heavy load bearing component and a relatively large rated current must have a certain degree of hardness and toughness in material, high structural strength, and consider the connection between the installation location and the cabinet. The vibration factor of the on and off power supply should also be considered, the convenience of maintenance (cannot be installed too high) the balance of gravity (do not have the gravity on one side of the cabinet), and the environment where the cabinet is located will cause vibrations due to heavy equipment (such as large forging equipment) , Consider the cabinet's component shock), consider the dustproof, moisture-proof, and the arc extinguishing protection of the components in the cabinet in the environment with many charged particles, the underground space is limited, the cabinet height is considered, the transportation considerations are fixed, the site The transportation, the ease of installation and removal of the parts, the versatility of the parts, the deformation of the intermediate process, and the principle of economic efficiency should be taken into consideration. The most reasonable material should be selected in the corresponding structure (for example, the non-carrying partition should consider the material A little thinner, a little lower yield strength (Q195 or 175, etc., make some changes in the processed shape to achieve good performance). The mechanical properties of different materials are omitted here. For the beauty of the welding cabinet, in some cases, the welding hole can be designed to make the solder joints accurate and uniform, and the solder joints are basically invisible after polishing and plating after welding. It involves cutting, punching, folding, welding, surface treatment and other processes in sheet metal technology. At the same time, the sophisticated equipment also involves the use of many advanced equipment and other technologies to ensure the process performance of the final product. At the same time, there is also sheet metal. Expansion calculation, sheet metal processing mold design, fixture design, sheet metal process card preparation, etc., including some post-processing techniques, and these must be coordinated with each company’s equipment, personnel, environment, resources and other factors. Every technical detail is considered in detail, and every process is complete to produce high-performance and high-quality switchgear.

Finally, the small process steps and details in sheet metal processing are the pre-requisite for the performance and quality of the switchgear. All the technical theories are clear and reasonable. Then processing is the key to the transformation of results, and processing and technology This kind of purely theoretical things are different, and some of them cannot be guaranteed by theory. For example, the precision of the ordinary shearing machine is about 1mm, the CNC shearing machine is about 0.5mm, and the CNC right angle shearing machine is about 0.3. This is based on the data, and different manufacturers, different usage conditions, different gaps, etc. There are many differences. It depends on the skill of the operator and the familiarity of the equipment. At the same time, knowing the critical dimensions on the drawing and how much the error is controlled. The same is true for the process steps such as bending. How to make accurate dimensions before folding Calculate to prevent the material from being folded at the end, how to ensure that the error of size and angle is within the tolerance range, how to ensure the key size when the material is small, without affecting the use and quality of the parts, and whether it is folded inside or folded outside. Inside or outside of the side bag (relative to the unfolded size), the direction of the hemming, the removal of burrs that affect the size before the hemming, the condition of the knife groove selected in the bending, etc., whether the welding process meets the welding specifications, and whether the welding point is selected It is reasonable, whether the welding point is inside or outside, the processing after welding, etc. These are the most basic processes, as well as the quality of the selected secondary materials, the sharp corners of the finished product, the removal of burrs, and the deformation after processing. The processing conditions and the smoothness of the surface coating involve many process details. Therefore, the structure of the cabinet is the skeleton as the basis and the guarantee for the production of qualified switchgear. The process details are flesh and blood, high quality, high performance, and humanity. The premise of high-quality switchgear. The process here includes both theoretical technology and practical operation. (Of course, the selection of electrical components and the process of installation are also involved in the following. This is only the description of the cabinet) and here are just some of the most basic things. For deeper things, each company has its own uniqueness and also involves technical secrecy, so I won’t elaborate on it.

Through the above description, it is easy to see the influence of the structure and technology of the switch on the performance and quality of the entire switchgear. The importance of attention to detail, refined design and manufacturing, and the power distribution system can also be said to be the heart of a manufacturing enterprise. It is directly related to the daily production of the production enterprise.