JPH0386360A - Instrument for diagnosing abnormality of roll interval in continuous casting equipment - Google Patents

Abstract

PURPOSE:To quickly and surely execute diagnosis of abnormality of roll interval by detecting the distance between the rolls of roll pair by a roll interval detector fitted to a dummy bar and comparing this detected value with the past detected result. CONSTITUTION:A strand drawn out by a pinch roll pair 3 from a mold is held by plural pairs of the guide rolls 2. The roll interval of these roll pairs 2, 3 is detected by the roll interval detector 4 fitted to the dummy bar 1 preceding to the above strand one after another. This detector 4 is constituted of one pair of arc-like arms 40, coil springs 41, angle detectors 42, etc., and the above detected result is wirelessly transmitted to a diagnostic instrument 5. In this diagnostic instrument 5, the above detected result is compared with the past detected result stored in a file part 53. It is decided whether the abnormality of the roll interval exists or not, based on this difference and this decided result is shown on a display part 52 and also, if necessary, an alarm 51 is worked.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for diagnosing abnormalities that occur in a pair of rolls that transfer strands during the operation of continuous casting equipment.

[Prior art]

In the continuous casting method, molten metal is poured into a cylindrical mold with openings at the top and bottom, and the strand is cooled by contact with the inner wall of the mold and is coated with a solidified shell. It is drawn out, further cooled, and after completely solidified is cut into a predetermined length to obtain slabs that will be used as raw materials for subsequent processes such as rolling, and has high production efficiency.
It is widely adopted as a steelmaking method that consumes less energy.

Now, in continuous casting equipment for carrying out such a continuous casting method, a large number of roll pairs are installed in parallel along the path for pulling out the strand from the mold, for gripping and transporting the strand. If the distance between the rolls (roll spacing) in each of these pairs of rolls is not maintained normally, various problems such as poor shape 5 and internal cracks will occur in the slab obtained as a product, and furthermore, the roll spacing may be incorrect. If an abnormality is left unrecognized, the load on other roll pairs in the vicinity of the abnormal roll pair will increase, causing abnormalities in these roll pairs as well, leading to serious accidents that may lead to operational shutdowns. There is even a possibility that it will. In this way, in the operation of continuous casting equipment, it is important to manage the distance between each pair of rolls, but since the number of pairs of rolls installed in parallel ranges from tens to hundreds, it is important to manage the distance between each roll. It is not easy to do this on a daily basis.

Therefore, it has been conventional practice to use a dowel bar inserted into the lower part of the mold as a pseudo-bottom to control the roll spacing before the start of operation. This is achieved by attaching a roll spacing detector to the dummy bar, and each time the dummy bar is pulled out before the strand and passes through the placement position of each roll pair, the roll spacing in the roll pair is determined by the roll spacing detector. This is so that it can be detected. In addition, there are many disclosed examples of roll interval detectors attached to dummy bars, such as Japanese Utility Model Application Publication No. 152903/1983 and Japanese Patent Application Publication No. 5403/1983, and Japanese Patent Publication No. 62-60187, A data processing method for correctly associating detection results obtained by a roll spacing detector with each roll pair is disclosed.

[Problem to be solved by the invention]

However, when maintaining continuous casting equipment, it is important to diagnose whether the roll spacing is good or bad based on the roll spacing detection results, but this diagnostic method has not been clearly demonstrated in any of the above-mentioned conventional techniques. Conventionally, the detection results obtained for each pair of rolls are
A method has been adopted in which a roll pair is displayed on a suitable display device such as an RT display in correspondence with a number specifying the roll pair, and an operator who visually confirms the displayed content diagnoses an abnormality in the roll interval. However, when using this type of diagnostic method,
It takes a lot of time to diagnose each of the many roles,
In addition, the occurrence of an abnormality is overlooked, which not only causes a decline in product quality, but also induces further abnormalities, causing serious accidents, or conversely, erroneous diagnoses are made that there is an abnormality, and it is difficult to confirm this. The meaningless suspension of operations has caused various inconveniences, such as a decline in operating efficiency.

The present invention has been made in view of the above circumstances, and it is possible to reliably and quickly diagnose roll spacing abnormalities from the detection results of the roll spacing detector attached to the dummy bar, and facilitate equipment maintenance. The purpose of the present invention is to provide a roll spacing abnormality diagnosis device for continuous casting equipment that can contribute to improving product quality and operational efficiency.

[Means to solve the problem]

The roll spacing abnormality diagnosis device for continuous casting equipment according to the present invention measures the distance between each of a plurality of rolls that clamps a strand to be pulled out from a mold and transports it along a predetermined path by attaching it to a dummy bar preceding the strand. In a roll spacing abnormality diagnosis device for continuous casting equipment that sequentially detects the abnormality of each roll pair using a roll spacing detector and diagnoses abnormalities of each roll pair based on the detection results, the past detection results of the roll spacing detector are a storage means for storing data in correspondence with each of the roll interval detectors; a comparison means for comparing the current detection result by the roll interval detector with the corresponding stored content of the storage means; and a comparison means for determining the presence or absence of the abnormality based on the comparison result. The method is characterized by comprising a determining means for making a determination.

[Effect]

In the present invention, the detection result by the roll spacing detector is compared with the detection result obtained in the past for the corresponding roll pair, and for example, if an error between the two exceeds a predetermined tolerance range, At this time, it is determined that an abnormality in the roll interval has occurred in the pair of rolls, and the operator is notified of this determination result by means such as issuing an alarm or changing the display content with other detection results.

[Examples] The present invention will be described in detail below based on drawings showing examples thereof. FIG. 1 is a schematic diagram showing the configuration of a roll interval abnormality diagnosis device for continuous casting equipment according to the present invention (hereinafter referred to as the device of the present invention).

1 in the figure indicates a large number of bent nodes 1 at predetermined intervals in the longitudinal direction.
This is a dummy bar configured with a, la...

Prior to the start of casting, this dummy bar l is inserted between each pair of a large number of guide roll pairs 2, 2... and pinch roll pairs 3, which are arranged in parallel along a path for pulling the strand from the mold (not shown). The tip is inserted into the lower part of the mold for an appropriate length, and serves as a pseudo bottom of the mold to stop the initially injected molten metal, wait for the molten metal to solidify, and then be pulled out by rotation of the pair of pinch rolls 3. It will be done. The molten metal that is continuously injected into the mold is successively cooled by contact with the inner wall of the mold, and becomes a strand whose outside is covered with a solidified shell. It will be done. Thereafter, this strand is continuously pulled out by the rotation of the pinch roll pair 3 and is guided by the guide roll pair 2, 2, . . . and transferred in a predetermined direction, thereby operating the continuous casting equipment.

Now, in the middle of the dummy bar 1, a roll interval detector 4 is attached for detecting the roll interval between the guide roll pairs 2, 2, . . . and the pinch roll pair 3 during the pulling out. The illustrated roll distance detector 4 is arranged between a pair of arcuate arms 40 and 40 whose base ends are rotatably connected to each other and which open and close with their convex sides facing outward, both of which are attached in the opening direction. A coil spring 41 is inserted between the arms 4 and 4.
0.40 to detect the opening and closing angle between the two,
An angle detector 42 using, for example, a potentiometer or the like
It is configured with. In addition, the roll interval detector 4
This structure is disclosed in the above-mentioned Japanese Patent Publication No. 62-60187 and Japanese Utility Model Application Publication No. 61-152903. It goes without saying that the roll spacing detector 4 having the configuration may also be used.

The bow-shaped arm 40.40 is attached to the dummy bar 1 so as to move with the connecting end first as the dummy bar l is pulled out downward in the figure, and is normally released by the biasing force of the coil spring 4I. , as shown in the figure, between the outermost arms 40 and 40, a pair of guide rolls 2
．． This results in a separation distance that is sufficiently larger than the normal roll spacing between the pair of pinch rolls 2 and 3. These arcuate arms 40, 40 are pushed in the closing direction by the rolls rolling in contact with the outside of each as they approach the position where the guide rolls 2.2 or pinch rolls 3 are disposed as the arsenal bar 1 moves. and as it passes through the placement position,
It returns to the open state again due to the biasing force of the coil spring 41.

Therefore, the detection result of the angle detector 42 that detects the opening/closing angle between both arms 40, 40 includes each pair of guide rolls 2, 2.
. . . and each time the pinch roll pair 3 passes through the arrangement position, a minimum value occurs, and the roll spacing detector 4 sequentially outputs the minimum values that appear in this way as detected values of the roll spacing.

This output of the roll distance detector 4 is given to the diagnostic device 5 by transmission means such as wireless transmission.

The diagnostic device 5 includes a determining unit 50 that determines whether the roll spacing is good or bad based on the detection results for each pair of rolls as described later, and displays the determination results by the determining unit 50 together with, for example, the detection results for each pair of rolls. The display section 52, the alarm device 51 that generates an abnormality alarm according to an operation command given from the determination section 50, which will be described later, and the detection results of the roll interval detector 4 are stored for each roll pair multiple times in the past. It is equipped with a file section 53 that provides judgment criteria to the judgment section 5o.

The operation of the apparatus of the present invention configured as described above will be explained with reference to the flowchart of FIG. 2 showing the operation details of the determination section 50.

The roll spacing is detected by the roll spacing detector 4 at
It starts with the start of pulling out the bar 1, and is performed in the order from the roll pair located on the upstream side in the pulling direction of the dummy par 1, that is, directly under the mold, to the roll pair on the downstream side, and the detection results of the roll spacing detector 4 are is given to the diagnostic device 5. The diagnosis section 5 identifies the large number of guide roll pairs 2, 2, . The detection result is this roll pair number N
be processed accordingly.

The determining section 50 gives an initial value 1 to the roll number N at the start of the operation, and first takes in the detected value G of the roll spacing given from the roll spacing detections 2'' and 4.The determining section 50 then calculates the detected value G of the roll spacing. The determination reference value G0 for the roll number N is read out from the file section 53 in correspondence with the roll number N.

As described above, the file unit 53 separately stores detection values of roll intervals detected in the past for each pair of rolls in correspondence with the roll number N. The roll interval detector 4 is attached to the dummy bar 1 as described above,
It is inevitable that the detection results of the detector 4 will vary slightly due to vibrations caused by the pulling out of the dummy bar 1. Is the file section 53 in the past? ! The detection results obtained over several times and their average values are stored, and when a read command is given from the determination unit 50, the average value is output as the determination reference value G0. As a result, the determination unit 5
It is possible to reduce as much as possible the influence caused by the variation of the detection result described above in the determination at 0.

After reading the determination reference value G0, the determination unit 50 calculates the deviation ΔG (=G Go ) between the current detected value G of the roll interval and the reference value G0, and calculates this deviation ΔG for each roll. The upper limit value Δ□8 and the lower limit value Δmi of the distance change between rolls are preset corresponding to each roll number N.
, and if it is between the two values, it is determined that there is no abnormality in the roll interval in the corresponding roll pair, and the current detected value G1 judgment reference value G0 and the deviation ΔG are displayed on the display unit 5.
2 to be displayed, and the current detected value G is given to the file section 53 to update the memory contents of the file section 53 corresponding to the roll number N, and then the current roll number N is set in advance. If it does not match the maximum value N0, count and amplify the roll number N and calculate the next detected value G.
Returning to the stage of capturing, if the value matches the maximum value Nmax, the determination unit 50 ends its operation. In addition,
It goes without saying that this maximum value N□8 is the total number of roll pairs in the continuous casting equipment.

On the other hand, as a result of the comparison, if the deviation ΔG exceeds the upper limit value Δ+maX or is lower than the lower limit value Δ1.7, the determination unit 50 determines that there is an abnormality in the roll interval in the corresponding roll pair, and the alarm 51 While issuing an alarm command, a predetermined signal for commanding an abnormality display is given to the display section 52 together with the current detected value G1, determination reference value G0, the deviation ΔG, etc. As a result, the display unit 52 displays the multi-value corresponding to the corresponding roll number N in a different manner, such as a different font or a white outline, or displays the multi-value with a white arrow. The display contents are changed by adding indicators to call attention to the above, etc., to assist in identifying the roll pair in which the abnormality has occurred. After making such a display, the determination unit 50 compares the current roll number N with the maximum value N, □, and if the two do not match, counts and amplifies the roll number N and determines the next roll number. The process returns to the step of capturing the detected value G, and if they match, the operation ends.

Table 1 shows an example of the content displayed by the display unit 52.

(Margins below) Table (Margins below) This display content indicates that the total number of roll pairs is 105, and the standard roll spacing in each roll pair is 267 mm to 27 mm.
5mm 2 strand type continuous slab casting equipment,
This figure was obtained by actually applying the device of the present invention.

In this way, in the device of the present invention, the occurrence of roll interval abnormality is quickly diagnosed almost simultaneously with the detection of the roll interval, and
The generation of an alarm by the alarm device 51 based on the diagnosis result indicates that an abnormality has occurred in one of the roll pairs, and also indicates the display content as shown in Table 1 displayed on the display unit 52 based on the diagnosis result. By visual inspection, it is possible to reliably recognize in which roll pair the abnormality has occurred.

In the display example in Table 1, it is clear that the 54th roll pair has an excessive roll spacing and the 57th roll pair has an excessive roll spacing, and the next operation will start according to this display. When we previously inspected the pair of rolls, it was discovered that each support bearing was defective.
As a result of immediately taking predetermined emergency measures, it was possible to prevent the spread of the roll interval abnormality to other roll pairs and the occurrence of defective products. As a result of six months of operation using the device of the present invention, the incidence of internal cracks in product slabs, which had previously reached 4.92%, was drastically reduced to 1.27%. It has become clear that application of this method can effectively prevent the occurrence of defective products.

〔effect〕

As described in detail above, in the device of the present invention, past detection results of the roll spacing are stored, and when a new detection result is obtained, it is compared with the stored content, and the roll spacing is determined based on the comparison result. Since the abnormality is determined, the abnormality diagnosis can be made immediately upon detection of the four-small interval, and a reliable diagnosis can be made without overlooking the occurrence of an abnormality or misunderstanding that an abnormality has occurred. The present invention has excellent effects such as facilitating the maintenance of continuous casting equipment and preventing the occurrence of defective products.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of the apparatus of the present invention, and FIG. 2 is a flowchart showing the diagnostic procedure by the apparatus of the present invention.

Claims (1)

[Claims] 1. The distance between the rolls in each of a plurality of pairs of rolls that grip the strand to be pulled out from the mold and transport it along a predetermined path is sequentially determined by a roll spacing detector attached to a dummy bar preceding the strand. In the roll spacing abnormality diagnosing device for continuous casting equipment that detects and diagnoses abnormality of each roll pair based on the detection result, past detection results by the roll spacing detector are stored in correspondence with each of the roll pairs. A comparison means for comparing the current detection result by the roll interval detector with the corresponding storage content of the storage means, and a determination means for determining the presence or absence of the abnormality based on the comparison result. A roll interval abnormality diagnostic device for continuous casting equipment.