Control method for preventing core pulling in coil discharging of strip steel coiling machine

Abstract

The invention provides a control method for preventing core pulling in coil discharging of a strip steel coiling machine. When the coiling machine is prepared to start to discharge coils, a coil-discharging trolley control PLC is used for controlling a coil-discharging trolley to ascend at low pressure; after the coil-discharging trolley makes contact with a steel coil, the coil-discharging trolley control PLC controls the coil-discharging trolley to ascend at high hydraulic pressure; high pressure is utilized for compensating for decrease of the height of a hydraulic cylinder, caused by dead weight of the steel coil after retraction of a central spindle of the coiling machine, of the coil-discharging trolley, and it is avoided that the height of the hydraulic cylinder of the coil-discharging trolley is decreased, so that the inner ring of the steel coil makes contact with a rubber roll of the central spindle. The height of the coil-discharging trolley is kept stable, it is effectively avoided that after the central spindle of the coiling machine retracts, the inner ring of the steel coil makes contact with the rubber roll of the central spindle, the situation that when an exit trolley discharges coils, core pulling of the steel coil happens is greatly reduced, the replacement period of the roll of the central spindle of the coiling machine is prolonged, cost for spare parts is saved, the production cost of the strip steel is reduced, the defective rate of the strip steel is decreased, the service life of the roll of the central spindle of the coiling machine is prolonged, and normal production is guaranteed.

Description

technical field [0001] The invention relates to a control method for coil unloading of a coiler, in particular to a control method for preventing coil unloading and core pulling of a strip steel coiler. Background technique [0002] In metallurgical enterprises, during the normal unloading process of the hot-dip galvanized strip at the export coiler, the traditional design is that the unloading trolley rises at low pressure in the mandrel area to prevent the continuous high-pressure rise of the unloading trolley from damaging the mandrel and other equipment; After the trolley unloading command is activated, the unloading trolley reaches the shaft area of ​​the coiler and begins to rise at low pressure. When the unloading trolley detects the outside of the steel coil, the trolley stops rising, the coiler shaft starts to shrink, the outer support opens, and the coil is unloaded. The trolley starts to move laterally away from the shaft area of ​​the coiler. After the steel coil...

AI Technical Summary

Problems solved by technology

On the one hand, the core pulling of the inner ring of the steel coil will affect the subsequent packaging. If the core pulling is too severe, the steel coil cannot be further processed, and the whole coil of strip steel can only be treated as waste, which greatly increases the production cost; On the one hand, due to the severe core pulling of steel coils, the unloading trolley cannot unload the coils, and the processing time is too long, resulting in a full set of export loops and the shutdown of the production line, which seriously affects the production rhythm of the hot-dip galvanizing line and the rate of first-class products; at the same time, the mandrel reel The huge friction with the inner ring of the steel coil also increases the loss of the rubber drum of the coiler mandrel and reduces the service life of the equipment