JPS60118311A - Method for monitoring slip of clutch in cross-roll mill - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for monitoring the clearance between a roll chock and a cross head of a cross roll rolling mill, and relates to a method for monitoring the clearance between a roll chock and a cross head of a cross roll rolling mill. It is intended to prevent jamming of the roll chock by the crosshead by monitoring.

In recent years, requirements for thickness accuracy in the width direction of rolled products have become increasingly strict. At present, in order to cancel the deflection of the roll due to the rolling load, the solution is to attach an initial crown to the roll. However, if the rolling conditions such as the width and thickness of the rolled material change significantly, it is necessary to keep rolls with various types of initial crowns and replace them with appropriate rolls. This leads to a decrease in the operating rate.

Further, the crown of the roll is not constant and changes due to wear and thermal expansion of the roll as the rolling operation progresses.

Therefore, there has been a need for a means to control the thickness profile of a rolled material in the width direction without replacing the rolls. In response to this demand, we developed a rolling mill that can control the thickness in the width direction of a wide range of rolled materials using the same roll and has a long roll life.
A four-high rolling mill shown in No. 605 was proposed. These rolling mills are configured such that the upper roll and the lower roll intersect at required angles with respect to a line perpendicular to the rolling direction within a plane including the rolling direction. By moving the upper and lower rolls and adjusting the cross angle, four points, etc., even if the rolling conditions change, the same roll can be used to control the thickness in the plate thickness direction. Roll life is extended.

In such a cross-roll rolling mill, the mechanism for crossing the upper and lower rolls must have the following functions (1) to (4) in addition to the function of moving the upper and lower rolls for crossing. .

(1) A function to accurately hold the upper and lower rolls at predetermined cross point positions.

(2) A function to support the horizontal force that is generated positively or negatively in the rolling material progressing direction against the upper and lower rolls during rolling.

(3) The upper and lower rolls must be able to move vertically under the conditions of (1) and (2) above both when setting the rolling reduction amount and during operation. Therefore, the function is to obtain an appropriate clearance between the roll chock and the crosshead for moving the roll chock.

(4) A function that prevents the roll chock from colliding with the crosshead during roll reassembly, making the reassembly work easier.

The applicant has proposed four-
As a Le Cross mechanism, we have proposed the device and mechanism shown in Japanese Patent Application No. 74901/1984 (Japanese Patent Application No. 190712/1982) and Japanese Patent Application No. 79165/1984 (Japanese Patent Application No. 195521/1989).

The present invention uses a cross clutch to prevent jamming of the roll chock by the cross head of the roll cross mechanism. Since the present invention provides a method for monitoring I#, an example of a roll cross mechanism will be explained with reference to FIGS. 1 and 2 before explaining the present invention. FIG. 1 is a schematic front view including a partial cross section showing an example of the roll cross mechanism, and FIG. 2 is a clear view of the operation of the cross drive device for the upper work roll chock.

In FIG. 1, 1 is a housing, 2 and 2' are upper and lower work rolls, 3 and 3' are upper and lower backup rolls, and 4a, 4b #5a15b.

6am6b*7m and 7b are worm jacks fixed to the housing respectively as moving mechanisms, 8 & and 9 a: t2
Each roll chock for the upper roll, 8a' and 9 m', each roll chock for the lower roll, 1 oa.

11a, 12a, and 13a are crossheads.

The worm jack, roll chock and crosshead are installed at both shaft ends of each roll 2.2', 3.3', i.e. on the working side 1.
and drive g411% port l (second
(see figure). However, Figure 1 is a front view seen from the working side, and the mechanisms on the drive side are not visible. Therefore, each mechanism on the driving side is shown with a reference numeral in parentheses attached to the corresponding mechanism on the working side. By using a roll cross mechanism as shown in Fig. 1, each worm jack 4a, 4b...7a
, 7 b , 4 c , 4 d ・7 c ,
7 dk Activate the crossheads 10a, lla・
...Roll chock 8a + 8b via 13b
... By moving 9 a'+ 9 b' in the rolling direction 20 front and back, the upper roll pair 2.3 and the lower roll pair 2/, 3
/ can be crossed. Note that 14 is a rolled material.

Figure 2 shows the upper roll pair of the rolling machine in Figure 1 as work roll 2.
FIG. 2 is a diagram illustrating the operation of the roll cross mechanism, as represented by . The lower roll pair has the same configuration as that shown in FIG. 2, except that the worm jack is configured to horizontally rotate in the opposite direction to that of the rolls in FIG. 2, so illustration and description thereof will be omitted.

In FIG. 2, a cross drive motor 15a as a rotational drive device of the moving mechanism is used as a rotary drive device 16m. 17as bevel gear 18a+19as Worm jack 4a h4b, 5a via mechanical tie shafts 20a, 21a
, 5b, and crossheads 10a, 11a'i
By moving, the roll chock 8a of the working side type I is horizontally moved in the front and back sides of the rolling direction 20. Similarly, the roll chock 8b on the drive side 101 is driven by the motor 15b, and the shift latch 16b, 1f b, bevel gear 18b,
19b, mechanical tie shafts 20b, 21b.

Wormjack 4 c + 4 d + 5 c,
5d and the crossheads 10b and 11b, it moves horizontally to the front and rear sides in the rolling direction 2 in the opposite direction to the roll chock 8a on the working side 1l.

In this case, the rotation direction and speed of the motors 15a, 15b are measured by speed sensors 27a, 27b, and the rotation amount of the mechanical tie shaft is measured by rotation angle detectors (pulse transmitters) 22a, 22b, 23.
m, 23b, and these measurements show that the opposing crosshead pairs (10a, 11a) and [10b, 11
b] are moved in synchronization in the same direction, moved in synchronization in opposite directions, or cross clutch 16a.

A control mechanism (not shown) is provided for controlling each crosshead to move independently by appropriately opening and closing 16b, 17a, and 17b. Further, position detection devices 24 and 25 attached to the housing 1 detect the horizontal positions of the roll chocks 8a and 8b in the rolling direction with respect to the housing 1, and feed back the detection signal to the control mechanism. In addition, 26a, 2 in Figure 2
6b, 26c, and 26d are speed reducers.

Therefore, if the initial adjustment is made using the cross clutch to maintain a predetermined clearance between the roll chock and the crosshead, the predetermined cross angle can be maintained while always maintaining the predetermined clearance a1eal as shown in Figure 2. α can be accurately set and maintained. In addition, when changing the rolls, in order to prevent one roll from collapsing due to contact between the roll chock and the crosshead, and to facilitate the work of changing the rolls,
After the cross angle is returned to zero, the cross clutch on the crosshead side that should be activated is set to %ONl, and the clutch on the opposite side is set to %OFF#, thereby greatly opening the clearance between the roll chock and the crosshead. be able to.

A cross clutch is equipped to fulfill the above-mentioned functions, but a highly reliable clutch with sufficient transmission torque should be selected.

However, since this cross clutch is a slipping clutch, 100% reliability cannot necessarily be expected, so it is necessary to constantly monitor clutch slippage in some way to make it absolute. In particular, when setting the cross angle, it is necessary to maintain a certain clearance between the roll chock and the opposing crosshead.In the event that the cross clutch slips when setting the cross angle, the opposing crosshead will tighten the roll chock. At that time, excessive torque will be generated in the drive system, which may lead to sticking or seizure of the threaded part of the worm jack.

The present invention is based on the above-mentioned concept, and provides a roll having a configuration in which the angle □ formed by the roll axis in a horizontal plane including the rolling direction can be slightly tilted from a right angle by displacing the mouth-ruteyock of the rolling mill. A pair of crossheads for moving the roll chock installed oppositely on both sides of the roll chock are each provided with a rotationally driven moving mechanism including a cross clutch, and the pair of crossheads move in synchrony with each other in the same direction and in the opposite direction. A control mechanism for controlling the rotational drive direction and rotational drive amount of the moving mechanism is provided for each of the various movement modes in which the movement is performed in synchronization with, or independently of, the movement mechanism, and the rolls are crossed depending on the selection of the movement mode. In a cross-roll rolling mill configured to hold at any position or move each crosshead independently,
An object of the present invention is to provide a clutch slippage monitoring system capable of preventing jamming of a roll chock by a crosshead.

The main structure of the first invention to achieve this object is to detect the rotation amount difference between the non-coupled side shafts of a plurality of mutually coupled cross clutches, and if the detected amount exceeds a predetermined range, the moving mechanism It is characterized by stopping the drive. In this case, it is not possible to determine which cross clutch has slipped, but the calculation formula required for determining whether or not a clutch has slipped is small and simple.

On the other hand, the main structure of the second invention that achieves the above object is as follows:
The present invention is characterized in that the rotation amount difference between the input and output shafts of each cross clutch is constantly detected, and if the detected amount exceeds a predetermined range, the drive of the moving mechanism is stopped. In this case, many calculation formulas are required to determine whether or not the clutch is slipping, but there is an advantage in that it is possible to determine which cross clutch has slipped.

In both the first invention and the second invention, clutch slippage is constantly monitored, and if any cross clutch slips, the drive of the moving mechanism is stopped, so that the crosshead facing the roll chock Jamming caused by pairs can be prevented.

An embodiment in which the present invention is applied to the cross roll rolling mill shown in FIGS. 1 and 2 will be described below. In FIG. 2, 28 is a cross clutch slippage monitoring device which includes counters 29a, 29b for each speed sensor 27a, 27b of the female motors 15a, 15b, a crosshead 10a,
10b.

Rotation angle detectors 22a, 22b of 11a, 11b.

Counter 30a*30b for 23a, 23b
-31a, 31b and the output values of each counter C,,C! I
Cs = C4-Cs, a calculation device 32 that calculates whether the value of the following formula (1) or the following formula (2) is below the allowable value based on Ca, and a calculation device 32 that calculates whether or not the value of the following formula (1) or the following formula (2) is below the allowable value, and a calculation unit 32 that calculates whether or not the value of the following formula (1) or the following formula (2) is below the allowable value. 'i control t le IIJ m
It is composed of a device 33.

However, C0: Count value C for speed sensor 27a! : Count value C1 for speed sensor 27b: Rotation angle detector 2
Count value C1 for rotation angle detector 2a: Count value C for rotation angle detector 22b; Count value C6 for rotation angle detector 23a: Count value for rotation angle detector 23b. Furthermore, each count value takes into consideration the reduction ratio as necessary.

As for the operation, when formula (1) is used, the cross clutches 16a and 17a are connected via the motor Jl 5 ai, and the cross clutches 16b and 17b are connected via the motor 15b, so that the cross clutches on both sides of the roll chock are connected via the motor 15b. Of the rotation angle detectors that detect the position of the crosshead, 22
Clutch clearance is monitored by comparing a and 23a and 22b and 23b, that is, whether both crossheads facing the roll chock are moving by the same amount.

That is, it is determined by calculation whether or not. If either of the above equations (1') does not hold true, an emergency stop action is taken to stop the p-cross drive motors 15a, 15b in response to a signal from the control device 33. however,
It is unclear which of the four cross clutches is slipping.

In the case of formula (2), each cross motor 15a.

Rotation angle detectors 22a and 23 detect the crosshead positions on both sides of the roll chock based on the speed of the roll chock 15b.
Comparison of each a and speed sensor 27B, and 22b
23b and the speed sensor 27b, the rotation amount difference between the input and output shafts of each cross clutch is independently detected and clutch slippage is monitored. That is, it is determined by calculation whether or not. In this case as well, if either of the above equations (2I) is not satisfied, an emergency stop procedure for the siffusion drive motors 15a, 15b is taken by a signal from the control device 33.

In addition, although the above-mentioned embodiment concerns the upper roll pair shown in FIG. 2, which is represented by the work roll 2, the lower roll pair is also completely the same except that the rotating direction of the rolls is reversed.

As described above, according to the present invention, jamming caused by a pair of crossheads facing a roll chock can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view of a cross roll rolling mill, and FIG. 2 is an explanatory diagram of the operation of a cross drive device for an upper work roll chock to which the present invention is applied. In the drawing: 4b, 4d, 5b, 5d are worm jacks, 8a, 8
b is a roll chock; 10m, 10b, 11a, 11b are cross heads; 15a, 15b are cross drive motors; 16a, 16b, 17a, 17b are cross clutches; 22a, 22b, 23a, 23b are rotation angle detectors; 27a, 27b 28 is a speed sensor, 28 is a cross clutch slippage monitoring device, 29m, 29b, 30a, 30b, 31a. 31b is a counter, 32 is an arithmetic device, and 33 is a control device. Patent applicant Mitsubishi Heavy Industries, Ltd. Nippon Steel Corporation Sub-agent Patent attorney Shibu Mitsuishi (and 1 other person) Figure 1

Claims (1)

[Scope of Claims] α) It has a roll configured so that the angle formed by the roll axis in a horizontal plane including the rolling direction can be slightly tilted from a right angle by displacing the roll chock of the rolling mill, A pair of crossheads for moving roll chocks placed opposite each other are each provided with a rotationally driven moving mechanism including a cross clutch, and the pair of crossheads move in synchronization in the same direction and in synchronization in opposite directions. Alternatively, a control mechanism for controlling the rotational drive direction and rotational drive amount of the moving mechanism is provided in each of the various movement modes that are independently moved, and depending on the selection of the movement mode, the rolls are crossed, held at an arbitrary position, or each In a cross roll rolling mill configured to move cross heads independently, the rotation amount difference between the non-connected shafts of a plurality of mutually connected cross clutches is constantly detected,
A method for monitoring cross clutch slippage, characterized in that driving of the moving mechanism is stopped when the detected amount exceeds a predetermined range. (2) The roll has a structure in which the angle formed by the roll axis in a horizontal plane including the rolling direction can be slightly tilted from a right angle by displacing the roll chock of the rolling mill, and the roll is installed oppositely on both sides of the roll chock. A pair of roll chock moving crossheads is each provided with a rotationally driven moving mechanism including a cross clutch, and the pair of crossheads can move in synchrony in the same direction, move in synchrony in opposite directions, or move independently. A control mechanism for controlling the rotational drive direction and rotational drive amount of the moving mechanism is attached to each of the various movement modes in which the movement is carried out, and depending on the selection of the movement mode, the rolls can be crossed and held at any position or each cross head can be moved independently. In a cross roll rolling mill configured to move the cross clutches, the rotation amount difference between the input and output shafts of each cross clutch is constantly detected, and if the detected amount exceeds a predetermined range, the drive of the moving mechanism is stopped. Features a cross clutch slippage monitoring method.