JPH0513728B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an apparatus for grinding the surface of a roll in a rolling mill by jetting high-pressure water.

(B) Prior Art As a method of grinding a roll while it is still attached to a rolling mill, there is a known method in which an abrasive is mixed into high-pressure water and jetted from a nozzle to grind the roll surface.

Conventionally, this type of equipment required a dedicated injection nozzle for each roll. Therefore, 4
The heavy rolling mill was equipped with four injection nozzles. Because these nozzles are installed in the housing, they always protrude in the direction of the roll even when grinding is not required, so they may become an obstacle during roll replacement work, making the work difficult, or Or, there were inconveniences such as damage due to contact.

(C) Problems to be Solved by the Invention The problems to be solved by the present invention are to address the drawbacks of conventional devices of this type, and to be able to be used commonly for both work rolls and backup rolls. To provide a grinding nozzle that reduces the number of nozzle installations by providing an injection nozzle, and also has a retraction mechanism that does not interfere with other parts when desired.

(d) Means for Solving the Problems The roll grinding device of the present invention is a roll grinding device such as a four-layer rolling mill equipped with a work roll and a back-up roll. A beam provided parallel to the roll axis direction at a position substantially tangential to the work roll and backup roll, a cart provided so as to be able to move laterally on the beam, a short vertically oriented rotating shaft attached to the cart, and the rotating shaft. A rotating part for the nozzle consists of a cylinder mechanism that gives the axis 90° reciprocating rotation, and a 180°
A high-pressure water injection nozzle, which is provided horizontally protruding from the lower end of the rotating shaft through a nozzle shaft rotation mechanism capable of reciprocating rotation, and whose tip has a spray angle vertically deflected by a predetermined angle; It consists of a supply system that supplies high-pressure water and abrasive material to a water injection nozzle, and by rotating the nozzle axis 180 degrees, it is possible to selectively grind either the work roll or the back-up roll. By doing so, the above problems are solved.

(E) Embodiment In the present invention, a nozzle that can be moved in the axial direction of the roll to be ground is provided, and by changing the spray direction of the nozzle, it is possible to back up the work roll (hereinafter referred to as W roll).・By using it for both rolls (hereinafter referred to as B rolls) and by making the nozzle's protruding direction variable, it can be retracted to a position where it does not interfere with other parts when not in operation. It has characteristics.

As shown in FIGS. 1 and 2, a beam 2 is installed as a bridge between housings 1 that support rolls. The installation height of the beam 2 is near the position where the W roll 3W and the B roll 3B touch, and a total of two beams are provided, one for each of the upper roll set and the lower roll set. Each of the two beams is provided with a nozzle device, which will be described later, but since both the upper and lower beams have the same structure, the upper beam will be described below as an example.

As shown in FIG. 3, the beam 2 is provided with a truck 4 having wheels 41 that engage from above and below, and a cylinder 42 for moving the truck 4. The beam 2 is used as a rail and the truck 4 is moved around a roll axis. It is designed to be able to move laterally in the long direction.

A nozzle 7 is provided on the truck 4 with a nozzle rotation mechanism 5 and a nozzle shaft rotation mechanism 6 interposed therebetween.

As shown in FIG. 7, the nozzle turning mechanism 5 includes a vertically rotatable short shaft 51 (hereinafter referred to as a rotating shaft) and a cylinder 54 that provides rotational movement to the rotating shaft 51. There is. A pinion 52 of the rotating shaft is meshed with the rack 53 of the cylinder 54, so that a reciprocating rotational motion of 90° can be transmitted to the rotating shaft depending on the movement range of the rack 53.

A nozzle shaft rotation mechanism 6 is attached to the lower end protrusion of the rotation shaft 51. The nozzle shaft rotation mechanism is the seventh
As shown in the figure, it consists of a cylindrical chamber 61 and a rotating body 62 with blades 621 housed within the chamber 61. There is a protrusion 63 in one place of the room 61.
are provided and brought into close contact with the side surface of the rotating body 62, and the tips of the blades 621 of the rotating body are also brought into close contact with the surface of the room 61. As a result, the annular room 61 is divided into two spaces 61 by the protrusion 63 and the blade 621.
It is separated by a and 61b.

A hose 64 for supplying and discharging pressure fluid is connected to each of the two isolated rooms 61a and 61b, and the pressure fluid is introduced into each room.
Creates a pressure difference in the introduced fluid. the result,
The position of the blade 621 is moved so that the rotating body 62 can be rotated by 180°.

A nozzle shaft 7 is integrally attached to the rotational center position of the rotary body 62 so that the nozzle shaft 7 is also rotated by 180° as the rotary body 62 rotates. .

As shown in FIG. 6, the nozzle shaft 7 is provided with a passage 71 for high-pressure water at its central portion, and is provided with an injection port 72 and an abrasive supply system 73 at its tip. The injection direction is not the direction in which the nozzle axis extends, but is deflected in a direction inclined vertically by an arbitrary angle θ.

(f) Effect In the apparatus of the present invention, first, in a state where the nozzle shaft 7 is protruding to the grinding position, the W roll 3W
When grinding, the nozzle injection port 72 is directed downward as shown in FIG. Then, depending on the position of the roll where grinding is required, the cylinder 42 is actuated to move the cart 4 so that the nozzle injection port corresponds to the position to be ground.

Next, when grinding the B roll 3B, the two chambers 61a and 61a of the nozzle shaft rotation mechanism 6 shown in FIG.
By replacing the pressure value of 61b, the pressure difference is reversed, and the rotating body 62 and nozzle shaft 7 are rotated by 180°. As a result, the injection port 72 of the nozzle is turned upward as shown by the reference numeral 72' in FIG. 5, and corresponds to the B roll 3B.
The roll is ground.

The nozzle 7 of this device can be left in the protruding state under normal circumstances, but when replacing the roll etc.
The protruding nozzle may hit the roll chock, etc., which is inconvenient. In this case, the cylinder 54 of the nozzle rotation mechanism 5 is operated, and the rotation shaft 5
By giving a 90° rotation to the beam 2, the nozzle axis 7 is rotated 90° and the beam 2 is rotated by 90°, as shown in FIG.
is evacuated to the lower side.

(g) Effects As described above, according to the roll grinding device of the present invention,
In a four-layer rolling mill, both the W roll and the B roll can be selectively ground using one common nozzle, which simplifies the equipment and is effective in reducing equipment costs. Moreover, since the nozzle can be swiveled below the beam and retracted when desired, interference with other parts can be prevented, and roll changing operations can be carried out smoothly and efficiently.

[Brief explanation of the drawing]

FIG. 1 is a side view of a four-layer rolling mill equipped with a roll grinding device according to the present invention. Figure 2 is - of Figure 1.
Top view with lines. FIG. 3 is a partial front view of the main parts of the roll grinding device according to the present invention. FIG. 4 is a plan view of FIG. 3 viewed from the negative direction. FIG. 5 is a side view of FIG. 3 viewed from the negative direction. FIG. 6 is a partially enlarged view of FIG. 5, partially shown in cross section. FIG. 7 is a sectional view taken along the line - in FIG. 6. FIG. 8 is an explanatory diagram of the nozzle shaft in a pivoting and retracted state. 1...Roll housing, 2...Beam, 3
... Roll, 4 ... Cart, 5 ... Nozzle turning mechanism, 6 ... Nozzle shaft turning mechanism, 7 ... Nozzle shaft,
8... Injection jet.

Claims (1)

[Claims] 1. In roll grinding equipment such as a 4-layer rolling mill equipped with work rolls and backup rolls,
A beam that is bridged between housings for supporting rolls and is provided parallel to the roll axis direction at a position substantially tangential to the work roll and backup roll, a cart that is provided so as to be able to move laterally on the beam, and a cart that is attached to the cart. A nozzle rotating section consisting of a short vertically oriented rotating shaft and a cylinder mechanism that provides 90° reciprocating rotation to the rotating shaft, and a nozzle shaft rotation mechanism capable of 180° reciprocating rotation to the lower end of the rotating shaft. a high-pressure water injection nozzle that protrudes horizontally and whose tip has a spray angle vertically deflected by a predetermined angle; and respective supply systems that supply high-pressure water and abrasive to the high-pressure water injection nozzle. The nozzle axis is 180°.
A roll grinding device characterized by being able to selectively grind either a work roll or a backup roll by rotating it.