Method for controlling coil stripping velocity of elevating mechanism of coil transfer car

Abstract

The invention discloses a method for controlling coil stripping velocity of an elevating mechanism of a coil transfer car. The method comprises the following steps: a steel coil elevating platform is propped up to fall at a preset first velocity-rising acceleration from an initial position; after rising to a preset velocity Vhigh1, the elevating platform falls at a constant velocity; while falling to the position at a distance H1 away from the bottom of the car, the elevating platform falls at a preset first velocity-reducing acceleration; after reducing the velocity to Vlow1, the elevating platform falls at a preset second velocity-rising acceleration; after rising to a preset velocity Vhigh2, the elevating platform falls at a constant velocity; while falling to the position at a distance H2 away from the bottom of the car, the elevating platform falls at a preset second velocity-reducing acceleration; and after reducing the velocity to Vlow2, the elevating platform starts braking. By utilizing the method, when the elevating mechanism of the coil transfer car discharges steel coils onto a V-shaped saddle, the running process from high-speed soft landing (the minimum velocity is reached when the elevating mechanism is contacted with the saddle) to high-speed falling is realized, thus meeting the demand for high rhythm production and realizing the minimum impact to the V-shaped saddle.

Description

technical field [0001] The invention relates to a speed control method, in particular to a coil unloading speed control method of a lifting mechanism of a rolling trolley, which belongs to the field of logistics and transportation of rolling mills. Background technique [0002] In steel rolling mills, hydraulic lifting coil trolleys are widely used in the transportation of steel coils and are the main tool for logistics and transportation in the factory. [0003] Coiler transport trolley, its task is to unload the coiled steel coil from the drum through the hydraulic lifting platform, and transport it to the baler for bundling, and then send it to the steel turning machine or the transport chain. In some production lines, the coil delivery trolley is responsible for delivering the steel coils from the reel to the steel turning machine, while in some production lines, the coil delivery trolley is only responsible for delivering the steel coils to the position of the baler, an...

AI Technical Summary

Problems solved by technology

Therefore, when a steel coil weighing 20 to 30 tons falls on the supporting beam at a relatively high speed, even though the supporting beam has a disc spring to absorb the impact load, it is difficult to resist the repeated impact of the fixed huge impulse, resulting in loosening and loosening of the fixed part of the walking beam. out of shape

[0025] 2) Shake the transport chain and the moving mechanism of the walking beam, which affects the normal transport of rolls

[0026] The looseness and deformation of the transport chain shafts and rollers, resulting in unstable chain transport and various forms of failure: transport jamming, chain arching, and electrical drive tripping, etc.

[0027] The looseness and deformation of the fixed part of the walking beam will cause the walking beam to shake when it is stepping, and the moving mechanism will deviate from the centerline of the fixed part when it moves, causing the detection limit to fail to sense or the limit block to hit the limit and damage the limit, affecting normal operation Roll production

[0028] At the same time, the shaking of the moving mechanism will aggravate the further loosening and deformation of the fixed part, resulting in a vicious circle

[0029] 3) Equipment maintenance costs are high and maintenance time is long

[0030] For V-shaped equipment, the replacement and maintenance cost of the fixed part is high, the maintenance construction time is long, and at the same time, it affects the movable part. Therefore, ensuring the equipment status of the fixed part and how to reduce the maintenance amount of the fixed part are the key to the maintenance of the walking beam. In order to reduce the maintenance amount of the fixed part, it is very important to reduce the impact on the fixed part when unloading the roll

[0031] 4) There is no optimal solution to the contradiction between equipment protection and production rhythm

[0032] The slow unloading speed at high speed is a balance measure to ease the contradiction. The potential of the power capacity of the lifting mechanism cannot be fully utilized, and often only half of its power capacity is used, and half of the speed still has a greater impact on the V-shaped seat.

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