Key points of explosion-proof bridge crane inspection

Review the data and compare ex-proof overhead crane with the product documents and contracts to check whether the selection and usage conditions of the explosion-proof bridge crane meet the specifications and contract requirements. The safety protection devices, electrical components and lighting equipment on the explosion-proof crane need to be in compliance with explosion-proof requirements. Whether to use explosion-proof type. The motor and control box should be explosion-proof or dust-tight, or the explosion-proof type allowed by the design; the lifting weight limiter should be explosion-proof, dust-tight or dust-proof, or the explosion-proof type allowed by the design; warning signal It should be intrinsically safe or comply with the explosion-proof type allowed by the design. Document review and physical inspection to see if the explosion-proof types of motors, control boxes, lifting capacity limiters, warning signals and other explosion-proof electrical equipment meet the requirements. The hazardous area division map of Sevencrane ex-proof overhead crane wholesale must be designed, divided and used by institutions with relevant qualifications in accordance with national regulations. The hazardous area description must be signed and stamped by the user. The description of the characteristics of explosive substances signed by the user should at least include the category, level and temperature group of the explosive substance.

Main isolating switch and short-circuit protection detection During the equipment detection in the electrical protection system of the gantry crane, it should be carried out based on the power outage mode, that is, adjusting the isolating switch to turn off the power between the power grid and the crane machine. Clearly set breakpoints during the off switch to allow the inspector to turn on the power state while working and to ensure that inspectors are safe enough. The air and bars are not completely closed and therefore are not usually used for bridge door detection in top choice for industrial ex-proof overhead crane. To increase inspector safety, the operating state of the main disconnect switch is preferred. In addition, when detecting short circuits, short circuit equipment should be installed to automatically cut off the power supply of the abnormal loop when the electrical insulation performance degrades or a short circuit occurs between two phases. Note: The entire AC supply of the bridge circuit around the integral current protection is tested during a short circuit to detect the corresponding rated current and operating current. a) The standardization of the crane threshold current must first be clearly defined and recorded; b) The current value at the top position is determined according to the regulations of the crane design. When the standard protection ROM and the circuit breaker instant protection ROM were last calculated, the calculated and set data were compared with the specific information to ensure the consistency of the calculation and requested information. During operation, attention should also be paid to the functional testing of the bridge door.

Check Pressure Protection The overvoltage protection enhancement of both lifting devices automatically shuts down the crane’s entire AC circuit after a power outage, thus ensuring the crane’s overall power supply by manually switching it on. First, voltage protection is usually performed on all switching power supplies on the two cranes through startup experiments. Turn on the emergency switch during the specific operation, and then fix the locking contact of the gas protection unit to keep it closed; secondly, activate the emergency stop switch and insulation device on the crane so that the total power bus voltage is always maintained after it is turned on. Disabled. Finally, manually push down or manually press the circuit breaker to protect the overall grid safety of the crane. The power circuit in the drive and the main insulation switch can also be automatically removed from the motor’s power circuit when a danger passes and the machine is shut down.

Safety protection devices Bridge jacks have a series of safety devices, lifting tools, lifting limits, overclocking protection, overload protection, etc. For lift braking, european standard ex-proof overhead crane suppliers is necessary to ensure that the braking circuit of the braking mechanism is separated to ensure that the machine and electrical are completely independent and to prevent the impact of electrical equipment and mechanical equipment. Check the braking performance regularly to ensure that the braking performance meets the standards. Height limits and height restrictions allow control of various anti-deformations that require good protection and heat treatment to ensure the performance of the device. When inspecting accessories, their qualifications and inspection reports will be checked, and if necessary, the nameplate on the accessory will be checked. Its effectiveness has been verified, including detecting and protecting other devices. This procedure checks the core components of the device and, if necessary, its operating environment. Edge cases are tested in case issues need to be reported and fixed promptly.

5. Check the zero protection. If the motor control cannot reset the operation in the crane, the zero protection must be set so that the power is automatically turned on when the controller handle is not reset, which is the result of shutdown. Quality problems can be avoided when the engine control unit is in the run position and automatically resets. When applying button controls, you can ensure security by installing button controls. Zero position protection checks take the form of electrical tests including selection of the cam controller, switching off the principal stress, subsequent realization of machining and subsequent control of the handle from the zero position. Therefore, not all power is off all the time. Second, after closing the motor base and contacting the controller, the command control must be turned off to ensure that it is in the actual position, and then the overall power supply is turned off and the crane is no longer turned on. During previous inspections, the inspection agency also found that the outdoor unit of the universal bridge crane split air conditioner was installed outside the driver’s room close to the boarding platform, resulting in unqualified safety distances and potential safety hazards. In the statistics of past accident cases, there are also accidents such as squeezes and collisions caused by unqualified safety distances or insufficient spatial distances, which should be paid enough attention to. The conditions at the inspection site are complex and diverse. You should observe carefully and operate with caution. Not only should you consider the safety hazards caused by insufficient safety distances in the horizontal direction of bridge cranes, but there are also safety hazards caused by insufficient distances in the vertical direction. Combined with relevant inspection regulations and standards, Avoid safety accidents caused by safety distance issues.