JPH0469485B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for disposing a small-diameter floating roll between large-diameter work rolls that are vertically spaced apart from each other, and disposing a small-diameter floating roll in the middle of large-diameter work rolls that are spaced apart from each other. A position setting device for a spray nozzle that injects coolant oil onto the rolled strip in a different speed rolling mill that rolls the strip between the work roll and the floating roll by making the circumferential speed of the roller faster than the circumferential speed of the input roll. Regarding.

BACKGROUND ART In a variable speed rolling mill as shown in FIG. 1, coolant oil is injected from, for example, a spray nozzle 08 to cool a rolling strip 4 and a floating roll 3.

Problems to be Solved by the Invention During threading, the floating roll set lever 5 swings, and the strip guide member (not shown) moves the work roll 1,
Move around 2. Therefore, spray nozzle 0
8 cannot be fixed, and each time the sheet is threaded, the spray nozzle must be retracted to a position where it does not interfere with the sheet threading operation.

Measures to solve the problem: Attach a spray nozzle to the floating roll set lever.

Operation During sheet threading, the spray nozzle swings together with the floating roll set lever. During rolling, the floating roll set lever is moved back slightly away from the floating roll, and coolant oil is spouted from the spray nozzle.

Example In Fig. 1, 1 and 2 are large diameter work rolls;
3 is a small-diameter floating roll, 4 is a strip plate, 5 is a floating roll set lever, 5a is a roll holding portion at the tip of the set lever 5, 6 and 7 are hydraulic cylinders, and 8 is a spray nozzle.

When threading, the upper work roll 1 is first raised, the hydraulic cylinders 6 and 7 are shortened, the floating roll set lever 5 is moved to position a at the rear end, the floating roll 3 is supported on the roll holding part 5a, and then the upper work roll 1 is raised. Then, extend the hydraulic cylinders 6 and 7 and rotate the set lever 5 counterclockwise.

When the floating roll 3 comes to the rolling position shown while pushing the strip 4, the set lever 5 stops at position b, and the upper work roll 1 descends to the rolling position, and each roll 1,
2 and 3 are ready for rolling.

At this point, only the short stroke hydraulic cylinder 6 is shortened, and only the set lever 5 is moved back and stopped at position c.

Rolling is started with the set lever 5 at position c, and coolant oil is injected from the spray nozzle 8.

When the set lever 5 is at position c, the roll holding portion 5a at the tip of the set lever is separated from the floating roll 3, so that the floating roll 5 can freely change its position.

Effects of the invention By attaching the spray nozzle to the floating roll set lever, the floating roll set lever pushes the floating roll to the rolling position, and then the floating roll set lever is partially retreated and coolant oil is injected from the spray nozzle to start rolling. It can be carried out.

Since the spray nozzle moves in conjunction with the floating roll set lever, there is no need to remove the spray nozzle during sheet threading, and the nozzle position is automatically set to the optimum position during rolling.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of an embodiment of a spray nozzle position setting device in a variable speed rolling mill. 1, 2...Work roll, 3...Floating roll, 4
...band plate, 5...floating roll set lever, 6,
7...Hydraulic cylinder, 8...Spray nozzle.

Claims (1)

[Claims] 1. A small-diameter floating roll is arranged between large-diameter work rolls arranged vertically at intervals, and the circumferential speed of the output roll of the work roll is higher than the circumferential speed of the input roll, and the floating roll is connected to the work roll. In a variable speed rolling mill that rolls a strip between rolls, a set lever is provided to set the floating roll at the rolling position during strip passing, and a spray nozzle is attached to the upper part of the set lever, and the set lever sets the floating roll at the rolling position. 1. A spray nozzle position setting device for a different speed rolling mill, characterized in that after setting the set lever, the set lever is moved slightly backward, and coolant oil is injected from a spray nozzle to perform rolling.