JP2010069525A - Device for measuring amount of roll thrust of rolling mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that it is impossible for a conventional technology to automatically measure the amount of roll thrust of a rolling mill stably and accurately under a light load of maintenance. <P>SOLUTION: There is provided a device for measuring the amount of roll thrust of the rolling mill, which includes a pair of laser range finders 20, 20A which are arranged so that the distance between a reference point outside the housing of the rolling mill and each end face of a pair of rolls inside the housing is measurable. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a roll thrust amount measuring device of a rolling mill, and more specifically, roll end surfaces of a pair of rolls inserted in a housing in a hole roll exchange of a steel slab mill (for example, a breakdown mill in a steel bar rolling facility). The present invention relates to a roll thrust amount measuring apparatus for a rolling mill, which is suitable for measuring the amount of misalignment in the roll axis direction (referred to as roll thrust amount).

Roll change (roll change) of a billet rolling machine involves guide change (guide change). A conventional roll exchanging method will be described with reference to FIG. 3, FIG. 4, and FIG.
FIG. 3 is a schematic plan view showing a conventional example around a steel slab rolling mill, FIG. 4 is a view taken along arrow AA in FIG. 3, and FIG. 5 is a flowchart showing a conventional example of work procedures for roll exchange and guide exchange. . The upper and lower rolls (hole type rolls) 2 and 2A are inserted into a housing (not shown) in the rolling line 1 and are operated with their relative positions in the height direction and the width direction adjusted with respect to the housing. The hole type rolls 2 and 2A, and the roll chock attached to both ends in the roll axial direction are not shown. At the time of roll replacement, the rolls 2 and 2A are pulled out / loaded in a direction indicated by an arrow (roll extraction / loading direction) 11 by a roll switching device (not shown). In addition, a side shift for exchanging the old roll with the new roll by moving the roll in the arrow direction 15 in the roll place 16 is interposed between the unloading and the charging. Is also provided. Note that the roll extraction / loading direction and the side shift direction are directions in a horizontal plane.

  The roll exchange is executed according to the roll exchange flow of FIG. That is, first, in the step of unclamping, the housing is switched from the clamp mode to the release mode by an operation from the mill cab, and the roll (old roll) can be pulled out from the housing. Next, in each step of roll removal, side shift, and roll loading, the roll is removed from the housing by a roll exchange device, the old roll is replaced with a new roll by the side shift, and the new roll is loaded into the housing. Next, in the clamping step, the housing is switched from the release mode to the clamping mode by an operation from the mill cab, and the roll is clamped so as not to come out of the housing. The clamped upper and lower rolls can be displaced in the vertical direction and the roll axial direction by operating a roll lifting mechanism and a roll thrust mechanism provided in the housing from the mill cab. Next, in the zero adjustment step, the upper and lower rolls are kiss-rolled by an operation from the mill cab, and zero adjustment (zero point adjustment in roll gap control) is performed. Finally, in the thrust adjustment step, thrust adjustment is performed to match the position in the width direction of the upper and lower roll hole molds. In rolling using a perforated roll, unlike the rolling using a flat roll, if the position in the width direction of the upper and lower roll perforations does not match, this will result in a misroll, so this thrust adjustment is important.

  In this conventional example, when adjusting the thrust, an operator enters the rolling line and measures the amount of positional deviation in the roll axis direction of the upper and lower roll end faces (this is called the roll thrust amount) with a ruler. In the mill operator's room, the roll thrust mechanism is operated to roll one of the upper and lower rolls until this measured value matches a predetermined amount of deviation corresponding to the position of the upper and lower roll hole molds in the width direction. Displacement is made in the axial direction. The predetermined amount of deviation is determined by the shape of the upper and lower rolls.

  On the other hand, the guide 3 is installed on the entry side of the rolls 2, 2 </ b> A in the rolling line 1 and is operated at a position where the bottom of the guide groove matches the pass level 10 of the rolling line 1. The guide exchanging device supports a rotating cylinder 7 provided at one end of the turning beam 4 rotatably by a support column 7 and rotates the turning beam 4 by rotating it with a turning drive device (not shown) that can be operated remotely. By turning in the direction 12, the guide 3 can be reciprocated between a position above the installation position in the rolling line 1 and a position above the guide place 8, and the guide 3 is remotely operated below the turning beam 4. And a guide lifting crane 5 that moves up and down in the direction indicated by an arrow 13 is provided. The guide 3 is classified into two types: a utility type in which utility (meaning water or oil) is supplied and a utility unpaid type in which utility is not supplied. The illustrated guide 3 is a type to which utility is supplied, and has a dedicated utility reception port 14 coupled to the utility hose 9.

  The guide exchange is executed according to the guide exchange flow of FIG. That is, first, in the step of removing the coupler, an operator enters the rolling line and removes the service hose 9 from the guide 3. The removed utility hose 9 is placed in an appropriate position so as not to interfere with the subsequent work. Next, in the step of removing the guide, the guide 3 is moved from the installation position in the rolling line to the guide place 8 by the guide exchange device. Next, in the installation surface cleaning step, the guide 3 installation surface in the rolling line is cleaned by a watering device (not shown) installed beside the rolling line. Next, in the guide installation step, a new guide placed in the guide yard 8 is moved to the installation position in the rolling line by the guide exchange device. Finally, in the coupler connection step, an operator enters the rolling line and connects the service hose 9 to the guide 3. Thereafter, in the extraction step, the steel slab is extracted from the heating furnace and rolling is resumed.

  In addition, regarding roll replacement of a rolling mill, Patent Document 1 describes an automatic pipe detaching device that can be used effectively for a rolling mill that performs rearrangement of a rolling roll. This is because the first connector block provided on the fluid supply source side such as a rolling mill and the second connector block provided on the fluid supply source side such as oil can be attached and detached without malfunction. The guide plate and the second connector block are provided with a guide roller for releasing the locking with the guide member by the lock pin by abutting with the guide plate.

Patent Document 2 discloses that “the amount of movement in the roll axis direction is detected by meshing the sector gear 38 and pinion 39 attached to the lever 28 and transmitting the rotation to the position detector 40” (Patent Document 2). : Page 2 lower right column 3 to 6) detection means (referred to as detection means S1 for convenience of explanation), or “the horizontal movement of the roll is converted into rotational movement using racks and gears, and this is converted into a pulse transmitter. Is detected ”(Patent Document 2: first page, right column, lines 5 to 7). The detecting means (referred to as detecting means S2 for convenience of description) is described.
Japanese Utility Model Publication 1-26953 JP 60-115315 A

  In the conventional roll changing method, after the new guide is installed in the rolling line, the work space for workers is insufficient and it becomes difficult to adjust the thrust of the roll. Is unsuccessful, and there is a room for improvement in terms of work efficiency due to a flow part in which roll exchange and guide exchange are forced to be performed in series (problem 1). Moreover, since the roll thrust amount measurement work at the time of thrust adjustment is an entry work inside the rolling line of the worker, there is room for improvement in terms of safety (Problem 2).

Further, in each step of removing the coupler and connecting the coupler in the guide replacement flow of FIG. 5, it is necessary for an operator to enter the rolling line, and there is room for improvement in terms of safety (Problem 3).
If a so-called contact-type tachometer such as the detection means S1 or detection means S2 described in Patent Document 2 is applied to a roll of a steel slab rolling mill, the roll thrust amount measurement operation at the time of thrust adjustment in roll replacement in FIG. It seems that it can be automated (unmanned) and leads to the solution of the above problems 1 and 2. However, since such a contact-type tachometer is fixed to the housing and comes into contact with the roll chock, impact vibration applied to the roll is transmitted via the roll chock when the material to be rolled into or out of the steel slab rolling mill is in operation. There is a concern that it will be easy to break down and maintenance costs will increase. In addition, even if a failure does not occur, the error gradually increases, and it is necessary to perform the error management on a regular basis, and the maintenance load increases. That is, with the conventional technique, the roll thrust amount of the steel slab rolling mill cannot be stably and automatically measured with a light maintenance burden (Problem 4).

  Further, if the automatic pipe detaching device for rolls described in Patent Document 1 is applied to a guide of a steel slab rolling mill, the coupler removal, coupler removal and coupler connection operations can be automated (unmanned), and the problem 3 It seems to lead to the solution of. However, such an automatic detachment apparatus has a difficulty in that the equipment cost is great and a problem in that the installation space is scarce, so that its application is extremely difficult. On the other hand, the present inventor separately invented as a means that can be realized with a small equipment cost and a small installation space, and can advantageously solve the above-mentioned problem 3, and can turn by turning a guide of a billet rolling mill A steel beam rolling machine comprising: a main beam formed into a main beam; and a child beam that is pivotable in synchronism with the main beam while supporting a utility pipe that supplies the guide from the outside to the guide. A guide exchange device (which will be referred to as a separate guide exchange device of the invention for convenience) will be filed separately.

  Accordingly, the present invention addresses the above problem 4 (the conventional technique cannot automatically and stably measure the roll thrust amount of a slab rolling mill with a light maintenance burden). An apparatus is provided.

  The present invention for solving the above-mentioned problems is an apparatus for measuring the roll thrust amount of a rolling mill, and measures the distance from a reference point outside the housing of the rolling mill to each end face of a pair of rolls in the housing. A roll thrust amount measuring device for a rolling mill (hereinafter, also referred to as a device of the present invention) characterized by having a pair of laser distance meters arranged in a possible manner.

  According to the present invention, there is a pair of upper and lower laser distance meters arranged so as to be able to measure the distance from a reference point outside the housing of the steel slab rolling mill to each end face of the upper and lower rolls in the housing. Thrust adjustment can be performed based on the difference in distance measurement values of the laser distance meters. The laser rangefinder can measure the distance from the outside of the housing directly to the roll end face without making contact with the roll chock, so it is not prone to failure and the error does not increase gradually. Stable and accurate automatic measurement with a low maintenance burden. And by carrying out the roll thrust amount measurement using the roll thrust amount measuring device of the present invention, it is possible to eliminate the entry of the worker in the rolling line for the roll thrust amount measurement, the safety is improved, and the roll It is possible to achieve complete parallelization of the replacement work and the guide replacement work, and the work efficiency is improved.

  FIG. 1 is a schematic plan view showing an example of an embodiment of the apparatus of the present invention, and FIG. 2 is a view taken along arrow BB in FIG. In FIGS. 1 and 2, 20 and 20A are a pair of upper and lower laser rangefinders arranged so as to be able to measure the distance to the upper and lower roll end surfaces in the housing, respectively, and 21 is a laser rangefinder 20 and 20A. Is a distance meter support that is fixed in position and posture so that the reference points of the two are located in the same vertical plane and the laser beams from both reference points are parallel to each other and can irradiate the upper and lower roll end faces. . 1 and 2, the same or corresponding members as those in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof is omitted.

  With the above configuration, the upper laser distance meter 20 measures the distance L1 from the vertical surface (reference surface) where the reference point is located to the roll end surface of the upper roll 2, and the lower laser distance meter 20A is the lower roll from the same reference surface. The distance L2 to the roll end surface of 2A is measured. Therefore, as shown in FIG. 2, the width direction positional shift amount (roll thrust amount) δ of the upper roll 2 with respect to the lower roll 2A can be calculated by δ = L1−L2.

  Since the laser distance meters 20 and 20A are installed outside the housing (off-line), the influence of vibration is small, and therefore, the laser distance meters 20 and 20A are less likely to fail and the error does not gradually increase. Since the operator can measure the roll thrust amount while being offline, the safety is increased, and for example, as shown in FIG. 6, the roll replacement and the guide replacement can be performed in parallel, and the work efficiency is also improved. improves. In the flow of FIG. 6, the work time is shortened by about 20% compared to the flow of FIG. Further, by exchanging the guide using the guide exchanging apparatus according to the invention, for example, as shown in FIG. 7, it is possible to eliminate the work of entering the rolling line of the worker from the guide exchanging flow, and further safety. Increase.

  As a usage form of the apparatus of the present invention, an operator may read the measured values of L1 and L2 from the data display unit of each of the upper and lower laser distance meters, calculate δ, and notify the mill cab. From the viewpoint of prevention and labor saving, the measured values of L1 and L2 are transmitted from the data output end of the laser distance meter to the mill cab via the data communication line, and automatically input to the arithmetic circuit to obtain δ (= L1− It is preferable to calculate L2) and display the result in a location easily visible to the operator in the mill cab.

  Further, according to the apparatus of the present invention, it is possible to monitor the change of the roll thrust amount not only at the time of roll replacement but also during rolling, and by adjusting the roll thrust amount at any time based on the monitoring data, rolling failure Generation of the material can be prevented in advance.

Schematic plan view showing an example of the device of the present invention BB arrow view of FIG. Schematic plan view showing a conventional example around a billet rolling mill AA arrow view of FIG. Flow diagram showing a conventional example of work procedures for roll replacement and guide replacement Flow chart showing work procedure of roll exchange and guide exchange when using the apparatus of the present invention Flow diagram showing work procedures for roll exchange and guide exchange when the apparatus of the present invention and the guide exchange apparatus of the invention are used separately

Explanation of symbols

1 Rolling line 2, 2A Upper and lower rolls (hole type roll)
3 Guide 4 Swivel beam 5 Guide lifting crane 6 Post 7 Rotating cylinder 8 Guide place 9 Utility hose (conventional)
10 pass level
11 Arrow direction (roll extraction / loading direction)
12 Arrow direction (turning direction of turning beam)
13 Arrow direction (lifting / lowering direction of guide lifting crane)
14 Guide service entrance
15 Arrow direction (side shift direction)
16 roll storage
20, 20A Vertical laser rangefinder
21 Distance meter support

Claims (1)

  A device for measuring a roll thrust amount of a rolling mill, comprising: a pair of laser rangefinders arranged to measure a distance from a reference point outside the housing of the rolling mill to each end face of a pair of rolls in the housing A roll thrust amount measuring device for a rolling mill characterized by comprising:

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