JP7732143B2 - Abnormality detection device for sizing press device and abnormality detection method for sizing press device - Google Patents

Description

The present invention relates to an abnormality detection device and method for detecting abnormalities and deterioration of the width adjustment mechanism in a hot rolling sizing press.

When width reduction is performed using a start-stop sizing press, the maximum press load is 2500tf-3000tf (24.5MN-29.4MN). The press load is designed to be distributed fairly evenly among multiple screws.

In a sizing press, a crank mechanism reciprocates the press tool to reduce the width of the rolled material. When the width reduction is released, that is, when the rolled material and the press tool are not in contact, the sizing press moves the rolled material forward and backward to a position where it will come into contact with the next press tool, thereby adjusting the width.

During this width adjustment, suppose that a failure to transmit input torque occurs in one screw due to, for example, worn coupling teeth or a loose universal joint. This failure to transmit input torque is called drive edge disconnection. In this case, the number of screws supporting the press tool during width reduction will decrease. This can result in a load exceeding the design strength of the pressure-receiving mechanism, including the press tool and screws, which could damage the equipment.

Patent Document 1 discloses an abnormality detection device for a sizing press as a conventional technique for detecting abnormalities in a sizing press. The device is composed of devices that measure the load on the support wheels, screws, and universal joints that support a block equipped with press tools, in other words, a device that measures the load on the sizing press itself.

Patent Document 2 also discloses a monitoring device for a sizing press. This device is equipped with a monitoring device that detects the operating speeds of various parts, a calculation device that calculates the relative positions of operating bodies, a determination device that determines whether the operating status is normal or abnormal, and a control device that automatically controls the system to recover from the abnormal state when an abnormality is detected.

Japanese Patent Application Publication No. 02-006031 Japanese Patent Application Publication No. 03-077704

However, the above-mentioned conventional techniques have the following problems.
The device described in Patent Document 1 is premised on measuring the load during width reduction and determining whether an abnormality has occurred, and it is difficult to prevent the occurrence of an abnormal load in advance.

In the device described in Patent Document 2, a calculation device calculates the relationship between each movable body based on signals from a rotation detection device such as a pulse generator (PLG) that detects the opening and closing speed of the screw. A determination device is configured to determine the width reduction operating state of the sizing press from the calculation results of the calculation device.

However, it is not designed to monitor the open/closed status of all screws. If a rotation detection device is attached to the drive distribution reducer for each screw, there is a problem in that it is difficult to accurately detect an abnormality when drive loss occurs in the coupling or universal joint downstream of the reducer output shaft.

The present invention was made in consideration of the above circumstances, and aims to provide technology that prevents width reduction work when the number of screws supporting the press tool is reduced.

To solve the above problem, the inventor discovered that by installing a rotation detector or displacement detector on the secondary side of the distribution reducer, i.e., on all screw shafts, it would be possible to monitor the position information of all screw shafts, and thus completed the invention.

The anomaly detection device for a sizing press according to the present invention, which advantageously solves the above-mentioned problems, is an anomaly detection device for a sizing press that includes a press tool positioned opposite the widthwise sides of the slab to be rolled, multiple screw shafts that adjust the position of the press tool, and a crank mechanism that reciprocates the press tool, and that reduces the width of the slab to be rolled. It is characterized by having position detection means for all of the screw shafts, and control means that can acquire information from the position detection means and monitor the position of the screw shafts.

The abnormality detection device for a sizing press according to the present invention is
(a) the position detection means is either one or both of a rotation detector for the screw shaft and a displacement detector for detecting the amount of movement of the slab in the width direction relative to the screw shaft;
(b) the control means has a calculation device that acquires information from either one or both of the rotation detector and the displacement detector and calculates the current position of the screw shaft from the information, and a determination device that automatically determines the obtained calculation result;
This may be a more preferable solution.

The method for detecting an abnormality in a sizing press according to the present invention, which advantageously solves the above problem, uses any of the above-mentioned abnormality detection devices for a sizing press, and is characterized in that the control means determines whether the position of the screw shaft is within a predetermined range.

In addition, a more preferable solution to the sizing press device abnormality detection method of the present invention is for the control means to issue an alarm and stop operation of the sizing press device when it determines that the position of the screw shaft is not within a predetermined range.

The anomaly detection device for a sizing press and the anomaly detection method for a sizing press according to the present invention can prevent width reduction when the number of screws supporting the press tool is reduced. This prevents equipment failures due to abnormal loads. Specifically, position information for all screws is measured and calculations and judgments are performed based on the measurement results. This ensures that all screws are reliably moved to their correct positions even before width reduction is performed, i.e., during the width adjustment operation. As a result, improved equipment availability is expected, making this an industrially useful system.

In addition, by monitoring the changes in the detection values of the rotation detector and displacement detector, it is possible to ascertain the backlash of each screw shaft, making it possible to detect the progression of deterioration of screw nuts, etc. This allows for preventive maintenance to be carried out before a serious failure occurs.

1 is a schematic diagram showing the configuration of an abnormality detection device for a sizing press according to one embodiment of the present invention. FIG. FIG. 10 is an enlarged schematic view showing a connection portion between the screw shaft and the press tool at an X portion according to the embodiment. 4 is a graph showing an example of the position of the screw shaft measured by the position detection means of the embodiment over time.

The following describes in detail the embodiments of the present invention. Furthermore, the following embodiments are intended to exemplify devices and methods that embody the technical concepts of the present invention, and are not intended to limit the configuration to those described below. In other words, the technical concepts of the present invention can be modified in various ways within the technical scope set forth in the claims.

Figure 1 is a schematic diagram showing the configuration of an abnormality detection device for a sizing press according to one embodiment of the present invention. Figure 2 is a schematic diagram showing an enlarged view of the connection between the screw shaft and the press tool.

The sizing press device 100 has an inner block 5 for width adjustment. This inner block 5 reciprocates in a direction perpendicular to the conveying direction FD of the slab material 2, i.e., in the width direction of the slab material 2 as the slab to be rolled. A pair of tapered dies 1 fixed to the inner block 5 presses both sides of the slab material 2 to reduce its width. Each inner block 5 is rotatably connected to multiple width adjustment screws 13. These screws 13 are threadedly engaged with screw nuts 3 fixed to the outer block 6. At the same time, they are driven and rotated by the drive motor 12 of the width adjustment mechanism via a universal joint 7, a spline shaft 8, and a distribution gear. The distribution gear consists of an offset gearbox 9, a gear coupling 10, and a distribution reducer 11.

The screw 13 built into the outer block 6 is rotated by the drive motor 12, adjusting the position of the inner block 5 and adjusting the width difference of the slab material 2. The outer block 6 reciprocates via a crank mechanism (not shown), causing the slab material 2 to be pressed down in width by the die 1 (width pressing). The press tool consists of the die 1, inner block 5, and outer block 6.

Meanwhile, the slab material 2 is sandwiched between pinch rolls installed at the front and rear, and while the slab material 2 is released from the mold 1, it is transported to the next press position (material transport). By alternating between width reduction and material transport in this manner, all sides of the slab material 2 are compressed along their entire length.

When the width adjustment screw 13 receives a width reduction force, it rotates in the reverse direction. Therefore, the drive motor 12 is equipped with an air brake that opens before the screw rotates, and closes and locks it when the rotation is complete.

The sizing press machine of this embodiment uses various detection devices. For example, a load cell 4 that detects the width reduction load is attached to the end of the screw 13 or the bottom of the screw nut 3.

In this embodiment, position detection means 14 are provided to detect the positions of all screws 13. The rotation detector serving as position detection means 14 is installed on the spline shaft 8 or screw 13 to detect the amount of rotation, for example, in terms of the direction of rotation, number of rotations, and rotation angle. The displacement detector serving as position detection means 14 is installed on the spline shaft 8 or screw 13 to directly detect the amount of movement in the width direction of the slab material (the direction perpendicular to the conveying direction FD). Either a rotation detector or a displacement detector is installed for all screws 13. It is preferable to install both. The position detection means 14 is preferably installed on the screw 13, which allows for abnormality detection even when the universal joint 7 breaks.

In this embodiment, the system has a control means 17 that collects information detected by the position detection means 14. The control means 17 is composed of a computer, sequencer, or the like. The control means 17 has a calculation device that sequentially calculates the information transmitted by the position detection means 14 and determines the current positions of all screws 13. The control means 17 has a determination device that determines whether all screws 13 are within a predetermined range set for each stage of width reduction and material transport. If the position deviation of the screw 13 exceeds the predetermined range and is determined to be abnormal, the control device issues an alarm and stops the sizing press device 100. For example, if the abnormality is determined to exceed a predetermined value due to drive edge disconnection or coupling tooth skipping, the equipment can be stopped before transitioning to width reduction operation.

In addition to constantly monitoring the position of the screw 13, the control means 17 may also collect information from detection devices such as the rolling load of the load cell 4, the rotation speed of the drive motor 12, and the rotation speed and rotational frequency of the pinch rolls. It then comprehensively evaluates this information to monitor the operation of the sizing press apparatus 100, and if an abnormality is detected, it is preferable to avoid the abnormality, notify the operator of the abnormality, or shut down the equipment.

Figure 2 is an enlarged schematic diagram of part X in Figure 1, showing in cross section the relationship between the pressure block 15 fixed to the inner block 5, the screw fastening ring 16, and the tip of the screw 13. In this embodiment, as shown in Figure 2, the threshold value for determining abnormal position deviation of each screw 13 is preferably set to be equal to or less than the gap dimension between the screw 13 and the screw fastening ring 16. This prevents damage to the screw fastening ring 16. The threshold value is preferably set to be equal to or less than 2.0 mm. Furthermore, it is even more preferable to set this threshold value to be equal to or less than 1.5 mm.

In the sizing press device 100 configuration shown in Figure 1, a CYLINC cylinder or laser displacement meter was used as the position detection means 14, and the position fluctuation of the screw 13 was calculated by the calculation device of the control means 17. The results are shown in a graph in Figure 3. In Figure 3, the vertical axis represents the position fluctuation x of the screw 13 during width adjustment operation, and the horizontal axis represents the elapsed time t. During normal operation, the position fluctuation x of all screws appears superimposed on solid line A. On the other hand, when a drive edge break occurs in any of the screws, the position fluctuation x of that screw is represented by dashed line B. Therefore, a position deviation of the screw occurs between solid line A and dashed line B. For example, a value indicated by D can be set as a threshold value, and when the position deviation between one screw and another screw exceeds that value, it can be determined that an equipment abnormality has occurred. This determination can be configured to be made by the judgment device of the control means 17.

Furthermore, if the screw nut 3 or the tip of the screw 13 is worn due to poor lubrication or overload rolling, the graph will deviate from the other normal screws (solid line A), as shown by the dashed-dotted line C in Figure 3. Normal wear levels can be determined in advance from the equipment's usage history, and when the wear level measured as the deviation between the solid line and the dashed-dotted line exceeds a predetermined value, it can be determined to be abnormal wear. Depending on the degree of wear, this can be reflected in the equipment's maintenance cycle.

The sizing press anomaly detection device and sizing press anomaly detection method of the present invention can prevent equipment failures caused by abnormal loads due to width reduction. It also makes it possible to detect the progression of deterioration in screw nuts, enabling preventive maintenance before a serious failure occurs. As a result, improved equipment availability is expected, making them industrially useful.

100 Sizing press device 1 Mold 2 Slab material (rolled slab)
3 Screw nut 4 Load cell 5 Inner block 6 Outer block 7 Universal joint 8 Spline shaft 9 Offset gear box 10 Gear coupling 11 Distribution reducer 12 Drive motor (of width adjustment mechanism) 13 Screw 14 Position detection means (rotation detector, displacement detector)
15 Pressure Block
16 Screw fastening ring 17 Control means FD Conveying direction

Claims (5)

An abnormality detection device for a sizing press apparatus for reducing the width of a rolled slab, the abnormality detection device comprising: press tools arranged opposite to each other on the sides of the width direction of the rolled slab; a plurality of screw shafts provided on each press tool for adjusting the position of the press tools; and a crank mechanism for reciprocating the press tools,
position detection means for all of the screw shafts;
and control means capable of acquiring information from the position detection means and monitoring the position of the screw shaft. The abnormality detection device for a sizing press machine described in claim 1, wherein the position detection means is either one or both of a rotation detector for the screw shaft and a displacement detector that detects the amount of movement of the slab to be rolled in the width direction relative to the screw shaft. The abnormality detection device for a sizing press machine described in claim 2, wherein the control means has a calculation device that acquires information from either or both of the rotation detector and the displacement detector and calculates the current position of the screw shaft from the information, and a judgment device that automatically judges the obtained calculation results. Using the abnormality detection device for a sizing press machine according to any one of claims 1 to 3,
The control means determines whether the position of the screw shaft is within a predetermined range. The method for detecting an abnormality in a sizing press device described in claim 4, wherein the control means issues an alarm and stops operation of the sizing press device when it determines that the position of the screw shaft is not within a predetermined range.