Internal structure and classification of the hotte

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Internal structure and classification of industrial control chassis

industrial personal computer (IPC), namely industrial control computer, is a general term of tools that use bus structure to detect and control production process, electromechanical equipment and process equipment. Industrial computers have important computer attributes and characteristics, such as computer CPU, hard disk, memory, peripherals and interfaces. Last year alone, more than 60million building blocks were produced as systems, control networks and protocols, computing power, and friendly man-machine interfaces. The products and technologies of the industrial control industry are very special. They are intermediate products and provide reliable, embedded and intelligent industrial computers for other industries

the main categories of industrial computers are IPC (PC bus industrial computer), PLC (programmable control system), DCS (distributed control system), FCS (Fieldbus System) and CNC (numerical control system)

ipc is the most common industrial computer. Because of its low price, high quality, large output and rich software/hardware resources, it has been familiar and recognized by the majority of technicians. This is the basis for the flexible configuration control mode, many types of friction pairs, large speed regulation range and the ability to imitate the computer heat in high-temperature environment. It can operate reliably in industrial environment as an industrial controller. It is mainly used in harsh environments, such as navigation, power plants, chemical plants, mining plants, underground operations, machine tool processing, etc. The industrial control cabinet shall be resistant to extrusion, corrosion, dust, vibration and radiation. Therefore, industrial chassis plays a key role in industrial computer. The quality of industrial chassis is closely related to the efficiency of industrial computer

industrial control chassis classification:

(I) height: generally divided into 1U, 2U, 3U, 4U, 5u, 6U, 7U, 8U, etc. the height of one 1U is 44.5mm, and so on; There is also a fixed standard for the width of the upper rack. The unified width of the box is 430mm, and the width with handle is 482mm, which is called the upper rack 19 inch chassis

(II) length: expand the length of various specifications according to the specific requirements of customers, such as 380mm, 400mm, 450mm, 480mm, 500mm, 520mm, 530mm, 600mm, etc

(III) horizontal and wall mounted

[1] horizontal: horizontal chassis is a relatively common industrial chassis, mainly with 4U specifications, and the size of 4U is 450mm-520mm, accounting for more than 90% of the market demand; Short specification chassis below 450mm is mainly installed with m-atx and itx small motherboards; The main board of ATX specification is installed between 450mm and 500mm; The main functions of the extended chassis above 520mm are as follows: one is to install Dual CPU Xeon eatx12“ × The main board of 13 "must be 520mm long to install such a large board; The other is to install industrial CPU long card or 300mm long video card, which requires sufficient expansion space; The last one is the consideration of heat dissipation space. Because some monitoring users need to install multi-channel video cards and multiple hard disks, such as 64 channels, 128 channels, etc., 10 hard disks need a good heat dissipation effect

[2] wall mounted: because some equipment manufacturers need to place the control center (IPC) in their equipment. Therefore, there are strict requirements for the volume of industrial computer. The volume of the traditional rack mounted 19 inch chassis is basically difficult to meet the requirements, so a wall mounted chassis is launched to meet the needs of such customers. For example, Dongguan jiuxun Computer Co., Ltd. produces 6c330 wall mounted chassis of "Jiuyin industrial control" brand. This kind of chassis is small in size and the application environment is inside a device, so the design concept also focuses on heat dissipation and expansion performance

internal structure of industrial control chassis:

(I) hard disk rack, optical drive rack: chassis with excellent quality generally has metal spring shockproof function

(II) base plate: there are many specifications of base plate; The 14 slot rear window is installed with ISA or PCI industrial CPU long card motherboard, and the 7 slot rear window is installed with ATX ordinary PC motherboard

(III) clamping strip: mainly for fixation. When installing the long video card with security monitoring or the long industrial CPU card, the long card must be fixed to avoid shaking and instability during use

(IV) expansion of rear slots: there are 7 slots or ● the author believes that the key of micromillr technology is alloy and 14 slots of casting machine; The 7-Slot backplane is mainly used for ordinary PC motherboard to install other expansion cards; The main purpose of the 14 slot backplane is to install multi-channel video cards. For example, when some large monitoring systems need 64 channels or 128 channels, they must be replaced with a 14 slot backplane

(V) guide rail: both sides of the chassis need to be equipped with special reserved mounting screw holes for the cabinet guide rail, which is convenient for fixing to the cabinet and convenient for maintenance

(VI) heat conduction of industrial control chassis: the rationality of heat dissipation structure is an important factor related to whether the computer can work stably

to some extent, it is an essential part of all experimental equipment (VII) earthquake resistance of industrial control chassis: when the industrial control chassis is working, the optical drive, hard disk and multiple fans in the chassis will vibrate when running at high speed, and the vibration is easy to cause wrong reading of optical disks, damage of hard disk tracks and even loss of data, Therefore, the earthquake resistance of the chassis is also a key structural design scheme of the chassis

(VIII) electromagnetic shielding of industrial control chassis: when the host is working, the motherboard, CPU, memory and various boards and cards will produce a large amount of electromagnetic radiation, which will also cause certain harm to the human body if it is not prevented. At this time, the chassis has become an important defense line to shield electromagnetic radiation and protect health. A well shielded chassis can also effectively block external radiation interference and ensure that the internal accessories of the computer are not affected by external radiation. In order to increase the heat dissipation effect of the industrial control chassis, the necessary parts of the chassis will be perforated, including the side plate hole of the chassis, the air inlet hole of the exhaust fan and the exhaust hole of the exhaust fan, etc., so the shape of the hole must meet the technical requirements that can block radiation. The opening on the chassis should be as small as possible, and circular holes with strong radiation barrier ability should be used as far as possible. Secondly, pay attention to the electromagnetic shielding of various indicator lights and switch wiring. The relatively long connecting line needs to be designed as a stranded wire, and the exposed welding metal parts at both ends of the line must be wrapped with a rubber sleeve, so as to avoid the electromagnetic radiation generated by the power lines in the chassis

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