JPH0434965Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a work roll holding device for a multi-stage cluster rolling mill that cold-rolls metal strips, in which a work roll chock and an intermediate roll chock are detachable. It is.

<Prior Art> FIG. 3 is a partial longitudinal cross-sectional view showing the essential parts of an example of a conventional multi-stage cluster rolling mill of different diameter work rolls equipped with a work roll chock and an intermediate roll chock.

In the figure, 11 is a small-diameter upper work roll disposed above the threading surface of the steel strip 10, 12 is a pair of intermediate rolls, and 13a and 13b are upper split rolls. 14 is a lower work roll disposed below the sheet passing surface; 15 is a lower back-up roll; 2
0 and 21 are housings 2 that pivotally support both ends of the lower work roll 14 and the lower back-up roll 15.
This is a chock fitted in 4. Reference numeral 17 designates a pair of intermediate roll chocks. The intermediate roll chocks 17 pivotally support both ends of the pair of intermediate rolls 12 via an inner chocks 18 and are fitted into the housing 24 and the lower work roll chocks 20. It is held by a balance cylinder 23 provided therein. 16 is upper work roll 1
The upper work roll chock 16 is fitted onto the upper part of the lower work roll chock 20, and the lower work roll chock is supported by an internal balance cylinder 22. It is held on 20. Reference numeral 19 denotes a frame fitted into the housing 24, and the frame 19 has upper back-up rolls 13a, 13.
b is pivoted.

When the steel strip 10 is passed and rolled as shown by the arrow, if maintenance is required due to trouble such as breakage of the steel strip 10 during rolling, the upper back up roll 13a, 13b is raised, and further the intermediate roll 12 and the upper work roll 11 are raised by the balance cylinders 22 and 23 via the upper work roll chock 16 and the intermediate roll chock 17.
Each will be raised to provide space for maintenance work.

<Problems to be solved by the invention> In the above-mentioned multi-stage cluster rolling mill, the balance cylinder 22 for raising the upper work roll chock 16 is installed inside the upper work roll chock 16, so it has to be downsized. Unfortunately, the stroke of the balance cylinder 22 is short, and the upper work roll chock 16 and intermediate roll chock 17
Since it is difficult to lengthen the fitting part (sliding part) with the protruding part 17a, it is impossible to move the upper work roll 11 sufficiently upward, and it is difficult to secure a wide working space required for maintenance work. It was difficult. As a result, work efficiency decreased and was a cause of increased line downtime.

The present invention has been developed in view of the above situation, and provides a work roll holding device that can secure sufficient working space between the upper work roll and the rolled material, and is capable of handling work such as when the rolled material breaks. The purpose is to improve efficiency and reduce line downtime.

<Means for Solving the Problems> The structure of the present invention to achieve the above object includes a work roll, a plurality of intermediate rolls, and a back-up roll located above and below or above the surface of the material to be rolled. The multi-stage cluster rolling mill is characterized in that a work roll chock and an intermediate roll chock above the surface where the material to be rolled is passed are connected via an attachment/detachment means.

<Function> When performing maintenance work, the work roll chock above the passing surface of the rolled material is connected to the intermediate roll chock by the attachment/detachment means, and the rolled material is lifted up and down by the intermediate roll lifting device with a large lifting capacity. To obtain a wide working space required for maintenance work by sufficiently raising a work roll above a plate passing surface together with an intermediate roll. When changing the rolls, the connection between the work roll chock and the intermediate roll chock by the attachment/detachment means is released so that both can be freely moved up and down.

<Example> Fig. 1 shows a partial longitudinal section of the main part of a rolling mill equipped with a work roll holding device according to an example of the present invention.
FIG. 2 shows a partially broken vertical cross-section of an enlarged main part of FIG. 1. Incidentally, members that are the same as those shown in FIG. 3 are given the same reference numerals and redundant explanations will be omitted.

In the figure, reference numeral 2 denotes a pair of intermediate roll jocks that pivotally support both ends of both intermediate rolls via an inner yoke 18. On the inner surface of the intermediate roll chocks 2, there is a pair of protrusions 2 in which air cylinders 3 are installed.
a are provided respectively. Reference numeral 1 denotes a pair of upper work roll jocks that pivotally support both ends of the upper work roll 11. Both ends of the upper work roll jocks 1 are fitted into protruding parts 2a, and the lower work roll jocks are supported by a balance cylinder 22. It is held on the upper surface of 20. Further, a coupling groove 1a is provided on the sliding surface of the upper work roll chock 1 with the protrusion 2a.

During maintenance work when the steel strip 10 during rolling breaks, insert the piston 3a of the air cylinder 3 into the coupling grooves 1a of both the upper work roll chock 1 and connect the intermediate roll chock 2 and the upper work roll chock 1. combine. After moving the upper back-up rolls 13a and 13b upward, the balance cylinder 2 with a large stroke
3, the intermediate roll chock 2 is greatly raised, thereby simultaneously moving the upper work roll 11 and the intermediate roll 12 upward via the upper work roll chock 1, thereby securing a sufficient working space.

When rearranging the work rolls, the upper work roll 11 and the intermediate roll 12 are brought into contact, the piston 3a is housed in the air cylinder 3, and the connection between the intermediate roll chock 2 and the upper work roll chock 1 is released. In addition, when changing rolls, intermediate roll chock 2 and upper work roll chock 1 are
It is also possible to simultaneously perform the work roll 11 and the intermediate roll 12 in a state where they are combined.

Note that the present invention is not limited to the rolling mill of the above-described embodiment, but can also be applied to a multi-stage cluster rolling mill of the same diameter work roll type in which the passing surface of the material to be rolled is vertically symmetrical.

<Effects of the invention> The work roll holding device of the invention is provided with a means for attaching and detaching the work roll chock above the rolling surface of the rolled material and the intermediate roll chock, so that the work roll can be moved upward together with the intermediate roll which has a large lifting amount. Since it can be moved, it is possible to obtain sufficient work space for maintenance work due to breakage of the rolled material during rolling, etc., improving work efficiency and shortening downtime of the line. In addition, in the roll rearrangement, there is also a secondary effect that it is possible to select either the work roll alone or the integral simultaneous rearrangement with the intermediate roll.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view of the main parts of a rolling mill equipped with a work roll holding device according to an embodiment of the present invention;
Figure 2 is an enlarged partial longitudinal sectional view of the main part in Figure 1, and Figure 3 is a cross-sectional view of a multi-stage cluster rolling mill with different diameter work rolls equipped with a conventional work roll chock and intermediate roll chock. FIG. 3 is a partial longitudinal cross-sectional view showing a main part of an example. In the drawings, 1 is an upper work roll chock, 2 is an intermediate roll chock, 3 is an air cylinder, 10 is a steel strip, 11 is an upper work roll, 12 is an intermediate roll, and 13a and 13b are divided backup rolls.

Claims (1)

[Scope of utility model registration request] In a multi-stage cluster rolling mill in which a work roll, a plurality of intermediate rolls, and a back-up roll are arranged either above, below, or above the surface where the material to be rolled is passed, the work roll chocks above the surface where the material to be rolled is passed. A work roll holding device for a rolling mill, characterized in that a and an intermediate roll chock are connected to each other via an attachment/detachment means.