Method for replacing an agc cylinder of a rolling mill

Abstract

The application provides a rolling mill AGC cylinder replacement method, and relates to the technical field of rolling mills. The rolling mill AGC cylinder replacement method is characterized in that a first rolling mill is sequentially arranged below an AGC cylinder of a rolling mill from top to bottom, and the replacement method comprises the following steps: a rolling changing device is used to pull out the second rolling mill from the rolling mill; an AGC cylinder bracket is installed and fixed above the second rolling mill; the rolling changing device is used to push the second rolling mill into the rolling mill; one end of an upper rolling mill balancing device of the rolling mill is connected with the AGC cylinder bracket; the AGC cylinder bracket is lifted to the position of the AGC cylinder by using the upper rolling mill balancing device; the AGC cylinder of the rolling mill is removed and placed on the AGC cylinder bracket, the AGC cylinder bracket is lowered to the second rolling mill by using the upper rolling mill balancing device, and the AGC cylinder bracket is fixed on the second rolling mill; after the connection between the upper rolling mill balancing device and the AGC cylinder bracket is removed, the rolling changing device is used to pull out the second rolling mill from the rolling mill, so that the replacement of the old AGC cylinder of the rolling mill is completed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rolling mill, in particular to a rolling mill AGC cylinder replacement method. BACKGROUND

[0002] The rolling mill is the main equipment for strip production. In order to eliminate the harmful gap between the pressure-down connecting parts in the rolling mill due to gravity, avoid the impact during biting, rolling and throwing steel, protect the equipment and maintain stable rolling, an upper roll balancing device for lifting the upper roll is arranged on the rolling mill, and the upper roll balancing device usually adopts a hydraulic cylinder. In addition, in order to facilitate roll changing, the rolling mill is equipped with a roll changing device and a roll pulling-out or pushing-in rolling mill.

[0003] The AGC cylinder of the existing hot strip production line is usually arranged at the upper end of the rolling mill. When the AGC cylinder needs to be replaced, the roll below the AGC cylinder needs to be pulled out of the rolling mill to leave a roll changing space. There are usually two methods for replacing the AGC cylinder: after the roll is removed, a replacement device with a lifting hydraulic cylinder is used to lift the AGC cylinder for replacement, such as the semi-arc AGC cylinder replacement device disclosed in application No. 201621324727.6; or a special tool is used in cooperation with a crane for replacement. Since the AGC cylinder is heavy, the AGC cylinder replacement device of the first method has a complex structure, high manufacturing cost, and needs to be connected with an external hydraulic system during use, which is time-consuming and labor-intensive. The second method is less used due to the limited hoisting space of the rolling mill AGC cylinder, the extremely difficult hoisting operation and the lack of safety. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a rolling mill AGC cylinder replacement method with simple replacement method and low replacement cost.

[0005] The technical solution adopted by the present application to solve the technical problem is: a rolling mill AGC cylinder replacement method, wherein the AGC cylinder of the rolling mill is sequentially provided below from top to bottom with a first roll and a second roll, and the replacement method comprises the following steps:

[0006] Step one: using a roll changing device to pull out the first roll from the rolling mill to leave an installation space for the AGC cylinder bracket, and then lifting the first roll away from the roll changing device after the first roll is pulled out of the rolling mill;

[0007] Step two: using the roll changing device to pull out the second roll from the rolling mill;

[0008] Step three: installing and fixing the AGC cylinder bracket above the second roll;

[0009] Step four: using the roll changing device to push the second roll into the rolling mill;

[0010] Step five: connecting the AGC cylinder bracket with one end of the upper roll balancing device of the rolling mill;

[0011] Step six, use the upper roll balancing device to lift the AGC cylinder bracket to the position of the AGC cylinder;

[0012] Step seven, after the AGC cylinder of the rolling mill is removed, it is placed on the AGC cylinder bracket,

[0013] Step eight, use the upper roll balancing device to lower the AGC cylinder bracket to the second roll, and fix the AGC cylinder bracket on the second roll;

[0014] Step nine, after the connection between the upper roll balancing device and the AGC cylinder bracket is removed, use the roll changing device to pull out the second roll from the rolling mill, thereby completing the removal of the old AGC cylinder of the rolling mill;

[0015] Step ten, after the old AGC cylinder is lifted off the AGC cylinder bracket, a new AGC cylinder is placed on the AGC cylinder bracket, and steps four to six are repeated to install the new AGC cylinder.

[0016] Further, both ends of the AGC cylinder bracket are respectively provided with support seats corresponding to the connection of the bearing shafts at both ends of the second roll, and the lower end surface of the support seat is provided with a latch hole;

[0017] When the AGC cylinder bracket is installed and fixed above the second roll, the lower end of the latch is inserted into the positioning hole on the bearing shaft of the second roll, and then the AGC cylinder bracket is lifted and placed on the second roll, so that the latch hole cooperates with the upper end of the latch.

[0018] Further, the AGC cylinder bracket is provided with a positioning groove matched with the AGC cylinder for fixing.

[0019] Further, one end of the AGC cylinder bracket and the upper roll balancing device of the rolling mill are connected by hanging.

[0020] The beneficial effects of the present application are that the replacement method uses the roll changing device and the upper roll balancing device 5 of the rolling mill to replace and install the AGC cylinder, without the need to remove all the rolls of the rolling mill, without the need to connect an external hydraulic system, and the replacement of the AGC cylinder can be completed by using a simple structure AGC cylinder bracket, so that the replacement efficiency of the AGC cylinder is higher and the replacement cost is lower. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a flow chart of the present application;

[0022] Figure 2 is a structural schematic diagram of the rolling mill;

[0023] Figure 3 is a schematic diagram when the AGC cylinder is removed or installed;

[0024] Figure 4 is Figure 3 the left view of

[0025] As shown in the figure: rolling mill 1, roll changing device 2, AGC cylinder bracket 3, bolt 4, upper roll balancing device 5, AGC cylinder 11, first roll 12, second roll 13, connecting rod 21, support seat 31, bolt hole 32. DETAILED DESCRIPTION

[0026] The application will be further described below in conjunction with the drawings and examples.

[0027] As Figures 1 to 4 shown, the rolling mill AGC cylinder replacement method of the application, the AGC cylinder 11 of the rolling mill is sequentially provided below from top to bottom with the first roll 12 and the second roll 13, the first roll 12 can be a support roll or a working roll, and the replacement method comprises the following steps:

[0028] Step one, use the roll changing device 2 to pull out the first roll 12 from the rolling mill 1 to leave the installation space of the AGC cylinder bracket 3, and after the first roll 12 is pulled out from the rolling mill 1, it is lifted away from the roll changing device 2;

[0029] Step two, use the roll changing device 2 to pull out the second roll 13 from the rolling mill 1;

[0030] Step three, install and fix the AGC cylinder bracket 3 above the second roll 13;

[0031] Step four, use the roll changing device 2 to push the second roll 13 into the rolling mill 1;

[0032] Step five, connect the AGC cylinder bracket 3 with one end of the upper roll balancing device 5 of the rolling mill;

[0033] Step six, use the upper roll balancing device 5 to lift the AGC cylinder bracket 3 to the position of the rolling mill AGC cylinder 11 to be able to hold the AGC cylinder;

[0034] Step seven, after the rolling mill AGC cylinder 11 is removed, place it on the AGC cylinder bracket 3,

[0035] Step eight, use the upper roll balancing device 5 to lower the AGC cylinder bracket 3 to the second roll 13, and fix the AGC cylinder bracket 3 on the second roll 13;

[0036] Step nine, after the connection between the upper roll balancing device 5 and the AGC cylinder bracket 3 is removed, use the roll changing device 2 to pull out the second roll 13 from the rolling mill 1, thereby completing the removal of the old AGC cylinder 11 of the rolling mill;

[0037] Step ten, after the old AGC cylinder 11 is lifted away from the AGC cylinder bracket 3, place the new AGC cylinder 11 on the AGC cylinder bracket 3, and then repeat steps four to six to install the new AGC cylinder 11.

[0038] AGC cylinder bracket 3 is a support for holding AGC cylinder, which can be welded by profile.

[0039] The replacement method of the application uses the roll changing device and the upper roll balancing device 5 of the rolling mill to replace and install the AGC cylinder, without external hydraulic system, which can be completed by using the AGC cylinder bracket with simple structure, and the replacement efficiency of the AGC cylinder is higher, more labor-saving, and the replacement cost is lower. Especially for four-roll and more than four-roll rolling mills, the replacement method of the application does not need to remove all the rolls of the rolling mill, and the replacement efficiency of the AGC cylinder is particularly obvious.

[0040] The AGC cylinder bracket 3 can be fixed on the second roll 13 by bolt connection, pin connection and the like. If the AGC cylinder bracket 3 is fixed on the second roll 13 by bolt connection, the connection between the AGC cylinder bracket 3 and the second roll 13 needs to be removed before step six, which is relatively inconvenient and affects the replacement efficiency. Therefore, in the application, preferably, both ends of the AGC cylinder bracket 3 are respectively provided with support seats 31 corresponding to the bearing shafts at both ends of the second roll 13, and the lower end surface of the support seat 31 is provided with a pin hole 32; when the AGC cylinder bracket 3 is installed and fixed above the second roll 13, the lower end of the pin 4 is inserted into the positioning hole on the bearing shaft of the second roll 13, and then the AGC cylinder bracket 3 is hoisted on the second roll 13, so that the pin hole 32 on the support seat 31 of the AGC cylinder bracket 3 cooperates with the upper end of the pin 4, thereby realizing the installation and fixation of the AGC cylinder bracket 3 above the second roll 13. In this way, the installation and removal of the AGC cylinder bracket is more convenient, and when step six is performed, the AGC cylinder bracket 3 can be automatically separated from the second roll 13 as the AGC cylinder bracket 3 rises.

[0041] In order to enable the new AGC cylinder to correspond to the installation position of the rolling mill AGC cylinder after the second roll 13 is pushed into the rolling mill 1, the AGC cylinder bracket 3 in the application is provided with a positioning groove corresponding to the AGC cylinder for fixing the AGC cylinder 11. The positioning groove cooperates with the AGC cylinder to also avoid the AGC cylinder from tilting and overturning during the movement of the AGC cylinder bracket.

[0042] The AGC cylinder bracket 3 and one end of the upper roll balancing device 5 of the rolling mill can be connected by bolt connection, hanging and the like, which is selected according to the specific structure of the upper roll balancing device 5. Figure 4 In the application, the AGC cylinder bracket 3 is connected with the lower end of the connecting rod 21 of the upper roll balancing device 5 by hanging.

Claims

1. A method for replacing an AGC cylinder of a rolling mill, wherein a first roll (12) and a second roll (13) are sequentially arranged from top to bottom below an AGC cylinder (11) of the rolling mill, characterized in that, The replacement method comprises the following steps: Step one, using the roll changing device (2) to pull out the first roll (12) from the rolling mill (1) to leave space for installing the AGC cylinder bracket (3), and then hoisting the first roll (12) away from the roll changing device (2) after the first roll (12) is pulled out from the rolling mill (1); Step two, using the roll changing device (2) to pull out the second roll (13) from the rolling mill (1); Step three, installing and fixing the AGC cylinder bracket (3) above the second roll (13); Step four, using the roll changing device (2) to push the second roll (13) into the rolling mill (1); Step five, connecting the AGC cylinder bracket (3) with one end of the upper roll balancing device (5) of the rolling mill; Step six, using the upper roll balancing device (5) to lift the AGC cylinder bracket (3) to the position of the AGC cylinder (11); Step seven, removing the AGC cylinder (11) of the rolling mill and placing it on the AGC cylinder bracket (3); Step eight, using the upper roll balancing device (5) to lower the AGC cylinder bracket (3) to the second roll (13), and fixing the AGC cylinder bracket (3) on the second roll (13); Step nine, after removing the connection between the upper roll balancing device (5) and the AGC cylinder bracket (3), using the roll changing device (2) to pull out the second roll (13) from the rolling mill (1), thereby completing the removal of the old AGC cylinder (11) of the rolling mill; Step ten, after hoisting the old AGC cylinder (11) away from the AGC cylinder bracket (3), placing the new AGC cylinder (11) on the AGC cylinder bracket (3), and then repeating steps four to six to install the new AGC cylinder (11).

2. The method of changing the rolling mill AGC cylinder according to claim 1, characterized in that: Both ends of the AGC cylinder bracket (3) are respectively provided with support seats (31) corresponding to the bearing shafts at both ends of the second roll (13), and the lower end surface of the support seat (31) is provided with a latch hole (32); When the AGC cylinder bracket (3) is installed and fixed above the second roll (13), first, the lower end of the latch (4) is inserted into the positioning hole on the bearing shaft of the second roll (13), and then the AGC cylinder bracket (3) is hoisted onto the second roll (13) so that the latch hole (32) cooperates with the upper end of the latch (4).

3. The method of changing the AGC cylinder of a rolling mill according to claim 1 or 2, characterized in that: The AGC cylinder bracket (3) is provided with a positioning groove for the AGC cylinder (11) to be fixed.

4. The method of changing the rolling mill AGC cylinder according to claim 1, characterized in that: One end of the AGC cylinder bracket (3) and the upper roll balancing device (5) of the rolling mill are connected by hanging.

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