The quality and ability of the explosion-proof crane installation team are uneven. The construction personnel operate without licenses and do not strictly follow the construction plan and design requirements during the construction process. During the inspection, we must focus on avoiding the occurrence of the following problems: the construction of safety protection devices, protective devices, cable introduction devices, grounding, wiring, etc. are installed and constructed according to ordinary ex-proof crane. The traction lines of the cable pulleys do not use stainless steel wire ropes. Electrical cabinets and power boxes The explosion-proof device is not tightly sealed, etc.
If the parts and safety protection devices of the crane have explosion-proof requirements, they should not be lower than the explosion-proof level and temperature group of the whole machine; some manufacturers do not configure according to the requirements of the manufacturing license configuration table due to negligence or other reasons; for example, choosing non-explosion-proof Functional parts, or use explosion-proof functional parts, but the explosion-proof level is lower than the explosion-proof level of the whole machine.
When inspecting sevencrane ex-proof crane wholesale electrical equipment on site, attention must be paid to whether its explosion-proof type is compatible with the zoning level of the hazardous area and the category, level and temperature group of explosive substances in the place of use. For hazardous areas in Zone 1 and Zone 2, flameproof electrical equipment, increased safety electrical equipment, intrinsically safe electrical equipment and oil-immersed electrical equipment can be used. During regular inspections, pay attention to check whether parts that do not meet explosion-proof requirements have been replaced, such as the bumper wheel on the limit switch and the roller of the cable pulley. They should be made of bronze, brass, stainless steel or engineering with a surface resistance not greater than 109Ω. Made of plastic. When the explosion-proof classification is IIC, IIIB and IIIC, the traction line of the cable pulley should be made of stainless steel wire rope.
During use, there is no anti-decoupling, the rope guide is damaged or missing, the rope cannot be effectively arranged within the entire working range, and jamming occurs. When the top choice for industrial ex-proof crane explosion-proof levels are IIC, IIIB and IIIC, no anti-decoupling equipment is used to prevent damage due to impact or friction. measures to prevent the generation of dangerous sparks, or failure to prevent the generation of dangerous sparks due to wear. The wire rope degrooving device is not protected by non-sparking materials, or is severely worn and cannot play a protective role.
During the inspection, CE approved ex-proof crane for sale was found that many wind-resistant and anti-skid devices do not have electrical protection devices, but only mechanical locking. This requires careful communication and patient explanation with the company. Carefully check whether the top rail, wedge-type anti-climb device, and self-locking anti-slip device function effectively, and whether the parts are defective. Especially during regular inspections, it was found that many wind-resistant and anti-skid devices were ineffective. When the explosion-proof level is IIC, IIIB, or IIIC, it is also necessary to check whether non-sparking materials are used at the locations where contact, collision or friction occurs.
Button failure, emergency stop failure, pressure loss protection failure, and replacement of the operating handle with an ordinary type are the most easily discovered problems during inspection. Pay attention to testing every operation button and don’t miss it.
The power box of the crane is generally installed by the user. Most of the installation units ignore that the power box of the crane should be an european standard ex-proof crane suppliers power box that is not lower than the explosion-proof level and temperature group of the whole machine; the power supply introduction should use soft conductive cables, and the connections between electrical equipment For wiring, rubber-sheathed copper-core multi-strand cables should be used, and should have a grounding core wire. Wiring should be copper-core multi-strand rubber-sheathed cables. No joints are allowed in the middle of the cables. Explosion-proof junction boxes can be installed if necessary.
Due to the insufficient understanding of the importance of the lifting capacity limiter by the user unit, inspectors often find that the lifting capacity limiter fails, is short-circuited, or is replaced with an ordinary lifting capacity limiter during inspection.
The buffer is partially missing or damaged, the buffer and the end stop device are not well connected, or the buffer on both sides of the operating mechanism of another crane cannot be in contact at the same time, and it cannot play an effective buffering role.
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