Introduction of troubleshooting methods for the li

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Introduction to troubleshooting methods of wheel crane line control system

a 633m wheel crane made in sennibogen, Germany, started the machine and pulled the operating handle, but there was no action, so it could not work. The circuit of the machine is shown in the attached figure

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from the attached figure, when you turn the ignition switch to the on potential, most places are almost blank; On the other hand, when China's industry has developed rapidly in recent years, the current point of the battery passes through the fire switch to the relay K1, and the K1 coil is powered on, and its normally open contacts 1 and 2 are closed. At this time, another current directly from the battery flows through the closed contacts 1 and 2 of K1 through the 25 a main fuse F1, and then flows to the control system of the whole machine action through the 10 a fuse F2

through inspection, it is found that relay K1 and main fuse F1 work normally, while fuse F2 has been burnt out. Therefore, it is preliminarily believed that due to the burning of F2, the current cannot flow to the control system, resulting in no action of the whole machine, so replace F2 fuse. After turning the ignition switch to the on potential again, it is found that F2 is burned immediately. Obviously, there must be a short circuit in the circuit controlled by F2, so it is necessary to check the circuit after F2. Through the study of the drawing, it is found that F2 controls all actions, and there is no other insurance behind it, so any short circuit in the circuit or component it controls will cause F2 burning

there are enough 10 lines controlled behind F2. Because there are many plugs and branches on the lines, it is inconvenient to measure them one by one, so it is decided to adopt the elimination method in a certain competition. That is, first cut off five lines, plug in the fuse, and observe whether it is still burned. If it is still burnt out, it is proved that the five lines that have not been broken have problems; If it doesn't burn, it is broken. There is a problem with the five lines. Results when five of the lines were broken, it was found that F2 did not burn, which proved that the problem was on the five lines that were broken. Connect the five lines one by one. When the fourth line is connected, the fuse F2 burns again, indicating that there is a problem with the fourth line. In order to rule out the fifth line, I changed the insurance and tried the fifth line again, but it didn't burn. Therefore, it can be concluded that there is a problem with the fourth line

the fourth line controls the hook lowering solenoid valve Y1 and the lowering limit switch S1. The working principle of S1 is to ensure that there are at least 3 rounds of steel wire rope on the winch drum, that is, during normal work, the pressure roller of S1 is pressed on the steel wire rope while confirming that Maoming Petrochemical has achieved mechanization and automation in the production process of raw materials and packaging engineering, and can monitor the key data of each production link in real time. Because the steel wire rope gives a reaction to the pressure roller, S1 is in the closed conductive position at this time, The crane can perform normal hook lowering operation. If the steel wire rope drops too much, and the number of steel wire rope turns on the drum is less than 3, the pressing wheel of the switch S1 cannot press the steel wire rope, so it cannot get the reaction force. S1 will automatically disconnect, resulting in the de energization of the lowering solenoid valve Y1 and no hook lowering action, which plays a protective role

through inspection, it is found that there is a damaged insulating skin in the internal circuit of limit switch S1, which leads to the grounding of the circuit and the short circuit of fuse F2. After the insulation treatment of the line, the machine returned to normal

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