Functions and types of safety protection devices f

2022-08-14
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Functions and types of mechanical safety protection devices

shells, covers, screens, doors, covers, fences, closed devices, etc. are usually used as object barriers to isolate people from hazards. For example, the protective box cover made of metal casting or metal plate welding is generally used for the protection of gear transmission or transmission devices with small transmission distance; The protection made of metal framework and metal is commonly used in belt transmission devices, and only the protection of youth who has made heroic efforts; Fence type protection is suitable for occasions with a large protection range or on-site protection for temporary operation of mobile machinery

1. the function of the protective device

(1) prevent any part of the human body from entering the dangerous area of the machine and touching various moving parts

(2) prevent the strike of flying objects, the accidental injection of high-pressure liquid, or the burning and corrosion of human body

(3) contain and accept the parts that may be thrown, dropped and launched by machinery and the fragments after destruction

in occasions with special requirements, the protective device also has a special blocking, isolation, sealing, and shielding effect on electricity, high temperature, fire, explosives, vibration, radiation, dust, smoke, noise, etc. the supporting area of the instrument base is large

2. type of protective device

the protective device has a protective device used separately (it can only play a protective role when the protective device is closed); And the protective device used in combination with the interlocking device (the protective device can play a protective role no matter in any state) 5. Extension automatic tracking range: 800mm. According to the way of use, it can be divided into fixed type and movable type

(1) fixed protective device. It is a protective device that remains closed or fixed at the required position. It is impossible to open or remove it without tools. Common types include closed type, fixed distance type and fixed distance type

① closed type: all dangerous areas are closed, and personnel cannot enter the dangerous area from anywhere

② fixed spacing type and fixed distance type: the dangerous area is not completely closed, and the opportunity for personnel to enter the dangerous area is prevented or reduced by virtue of its physical size and the safe distance from the dangerous area

(2) movable 1-DAN small crack size length reaches the critical size protective device. It is a protective device that is connected with the frame of the machine or adjacent fixed components by mechanical methods (such as iron chains, slides, etc.) and can be opened without tools. The common ones are adjustable and interlocking protective devices

① adjustable protective device. The whole device is adjustable or a part of the device is adjustable, and the adjusting part remains fixed during specific operation

② interlock protection device. The opening and closing state of the protective device is directly linked with the dangerous state of protection. As long as the protective device is not closed, the dangerous machine function "suppressed" by it cannot be performed; Only when the protective device is closed, the dangerous machine function "suppressed" by it can be performed. In the process of dangerous machine function, as long as the protective device is opened, the shutdown instruction is given

3. Safety technical requirements for protective devices

(1) the protective device should be fixed in the required place by permanent fixing (by welding, etc.) or by means of fasteners (screws, bolts, nuts, etc.). It cannot be moved or opened without tools

(2) the opening of incoming and outgoing materials shall be as small as possible, which shall meet the requirements of safe distance, so that people cannot touch the danger from the opening

(3) when the movable protective device or the movable body of the protective device is opened, try to keep connected with the protected machinery with the help of hinges or guide chains to prevent the removed protective device or movable body from being lost or difficult to recover

(4) when the movable protective device loses its safety function, the dangerous machine function "suppressed" by it cannot be performed or stopped; Failure of interlocks shall not result in accidental start-up

(5) the protective device should be the only access to the dangerous area

(6) the protective device should be able to effectively prevent the danger of flying objects

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