JPH10113710A - Balken bending damage detecting device for thick steel plate rolling mill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detect a Balken deformation without having a special protecting measure under adverse environment of high temp., high pressure flooding, high vibration, etc., when detecting a Balken deformation of a thick steel plate rolling mill, further, to facilitate installation in a narrow space between a work roll and a feed roller without using a sensor base. SOLUTION: A stainless wire 12 is arranged between a Balken 10 and feed rollers 7, 8 along a rear face of the Balken 10, a housing post 2a is mounted through a ball glass 14, a turnbuckle 15 and a hook 16, tension is introduced by the turnbuckle 15. By connecting a ground electric current detector 17 to the stainless wire, the Balken 10 and a stainless disk 13 are brought into contact each other, an flowing ground electric current is detected, alarm is outputted by an alarm 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balken (Balken) which is an auxiliary equipment for a bottom work roll of a hot plate rolling mill.
ken: a guide for thick steel plate), which is a device for detecting deformation of a thick steel plate rolling mill, which is used to detect deformation of the thick steel plate caused by the tip of the thick steel plate striking.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a quadruple-type hot plate rolling mill. A plate rolling machine 1 includes a pair of upper and lower work rolls 3 and 4 and a pair of upper and lower plates in a mill housing 2. A pair of backup rolls 5 and 6 are incorporated, and feed rollers 7 and 8 are arranged before and after the bottom work roll 4. The steel plate A is lowered by lowering the roll 3 and the top backup roll 5 with the reduction device 9. Between the bottom work roll 4 and the front and rear feed rollers 7, 8, hairpins 10 for guiding the tip of the thick steel plate A to correctly bite the work rolls 3, 4 are respectively provided on the upper surface of the bottom work roll 4. It is provided along.

The work rolls 3 and 4 and the backup rolls 5 and 6 have roll chocks at both ends thereof vertically slidable between a pair of housing posts 2a in the rolling direction. Feed rollers 7 and 8 have both ends thereof. It is rotatably supported by the housing post 2a via a bearing, and each is rotationally driven by a driving device. Baliken 10
Has a total length of about 9 m, a weight of about 4 tons, and both ends thereof are attached to the roll chocks of the bottom work roll 4.
It is integrated with the bottom work roll 4.

In the hot thick steel plate rolling mill having such a configuration, the tip of the thick steel plate A that has exited the work rolls 3 and 4 strikes the exit-side hair clipper 10 and curves the hair clipper 10 outward. When the bending loss increases, a serious accident is caused and a long pause is inevitable. Therefore, the deformation amount of the bending loss of the hair clipper 10 is detected while the deformation amount is small before reaching the dangerous area. It needs to be addressed.
The following method is considered as a method for detecting such a loss in the hairpin (see FIG. 6: the left side of the figure is omitted).

(1) Method of installing a sensor on the rivet itself (1-1) As shown in FIG.
An ultrasonic displacement sensor 50 or the like is installed on the bottom work roll 4 side through the through hole from the back (feed roller side) of the variken 10, and the controller 51 detects the amount of separation displacement of each variken 10 from the bottom work roll 4. .

(1-2) As shown in FIG. 6 (b), a displacement sensor 50 of an eddy current type, an optical type, an ultrasonic type, or the like is fed from a bottom work roll 4 side to a feed roller 7 through a through hole.
8 and feed rollers 7 and 8 of each
The controller 51 detects the amount of displacement approaching the vehicle.

(1-3) As shown in FIG. 6 (c), a dynamic strain gauge 52 is embedded in the main body of each hair clipper 10, and the amount of strain at the time of bending is detected by a dynamic strain gauge 53.

[0008] (2) Method of installing a sensor in the vicinity of the cricket (2-1) As shown in FIG. 6 (d), an eddy current type / optical type
A displacement sensor 50 such as an ultrasonic type is supported by a sensor base 56, and is installed at a central portion in the longitudinal direction between a back portion of each of the hair trims 10 and the feed rollers 7 and 8.
The controller 51 detects the amount of approach displacement of the back of the vehicle.

(2-2) As shown in FIG. 6 (e), the electrode rod 54 is supported by a sensor base 56, and is provided at the center in the longitudinal direction between the back of each hair clipper 10 and the feed rollers 7, 8. The contact current detector 55 detects the ground current due to the close contact of the back of each of the varikens 10 installed.

[0010]

However, the surroundings of the hair clipper 10 are in a very harsh environment such as high temperature, high pressure flooding, and strong vibration, and the space is also restricted. Each of the loss detection methods has a problem and cannot be permanently installed for a long period of time.

More specifically, there are a number of inhibiting factors as described below, and each detecting method has the following problems and disadvantages due to the inhibiting factors.

[Inhibitory Factor I] A large amount of roll cooling water or high-pressure water for scale removal is applied. Take the radiant heat of the hot steel plate (estimated 200 ° C). The bite impact vibration during rolling is as large as 3 to 5G.
Flying, falling, and accumulation of scale mass occur.

[Problems and Disadvantages I] Non-contact sensors such as general-purpose optical and ultrasonic sensors and contact sensors such as potentiometers and limit switches malfunction with water or steam, and cause vibration or vibration. 6A and 6B, it cannot withstand the above-mentioned poor environment because it is weak against impact.
-Long-term detection is not possible with the detection method using the displacement sensor of (d). In addition, in the detection method in which the sensor is installed on the hair clipper itself shown in FIGS. 6A, 6B, and 6C, since the hair clipper is attached and detached together with the bottom work roll, a waterproof and oil-proof connector is required for electric wiring. Costly and difficult to maintain.

In the case of the dynamic strain gauge shown in FIG. 6 (c), it can be detected for a long time because it is buried, but maintenance and maintenance of the dynamic strain gauge are troublesome.

[Inhibitory Factor II] The distance between the hair clipper 10 and the feed rollers 7 and 8 is about 1
It is as narrow as 00 mm (see FIG. 7A). The depth of the foundation ground required for the sensor mount is 7m (Fig. 7 (b)
reference). The diameter of the bottom backup roll 6 is as large as just over 2 m (see FIG. 7 (c)).

[Problems / Defects II] FIGS. 6 (d) and 6 (e)
In the detection method using the sensor mount of the above, the space for installing the sensor is narrow, so it is not possible to detect the bending loss without breaking the sensor, and if there is a backup roll, the base ground of the sensor mount is Can not secure. Further, since the base ground is deep, if the sensor mount is installed on the base ground, a large-scale structure is required, the construction cost is increased, and the operation and maintenance work are hindered.

[0017] From the above, in the above-described detection method, long-term permanent installation is impossible unless a special and expensive protection measure is applied to the sensor and a large and solid sensor base is installed. Has never been put to practical use until now.

The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to provide a special protective measure even in a poor environment such as high temperature, high pressure flooding and strong vibration. Without the need for a sensor stand, and can be easily installed in the narrow space between the bottom work roll and the feed roller. Is to provide.

[0019]

SUMMARY OF THE INVENTION The present invention is an apparatus for detecting deformation of a hair clip provided between a bottom work roll and a feed roller of a steel plate rolling mill, as shown in FIG. 1 or FIG. A rope-shaped detector is stretched between the hair clipper and the feed roller along the hair clip, and a ground current detector capable of detecting a ground current caused by contact between the rope-shaped detector and the hair clipper is connected to the rope-shaped detector. Characterized in that it is connected to a detection object.

The rope-shaped detector uses a conductor such as a stainless steel wire, and its both ends are connected to the left and right housing posts of the plate rolling mill via insulators, and tension is applied by a turnbuckle, a chain block, or the like. Is introduced. If the rope-shaped detector is fixed to the housing post via an insulator such as a ball insulator, the insulator will come into contact with the burr, and it will not be possible to detect minor deformation. Since the insulator may be damaged by this, a detection protrusion having a diameter larger than that of a ball insulator such as a stainless steel disc is attached to the center of the rope-shaped detector. in this case,
The rope-shaped detector and the detection protrusion may be made of a conductor, or only the detection protrusion may be made of a conductor.

The rope-like detector is fed with the hair-like detector so that the gap between the rope-like detector such as a stainless steel wire or the detecting protrusion such as a stainless disk and the back of the hair dryer (the surface on the feed roller side) is a predetermined distance. It is located between the rollers and stretches between the housing posts. An AC voltage of about 8 volts is applied to the rope-shaped detector or the detection protrusion from the ground current detector. When the tip of the thick steel plate passing between the upper and lower work rolls hits the rivet and the rivet is deformed, the back of the rivet comes into contact with the rope-shaped detector or the detection projection, and the ground current flows. The deformation of the hair clipper is detected by, for example, activating a relay of the ground current detector and outputting an alarm.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 shows the basic structure of a device for detecting a bending loss in a thick steel plate rolling mill, and FIG. 2 shows an embodiment thereof. FIG. 3 shows each member of the hair loss detecting apparatus of FIG. FIG. 4 shows the detection state.

Referring to FIG. 2, a hair loss detecting apparatus 11 according to the present invention includes a stainless steel wire 1 as a conductor sensor.
2 and stainless disk 13 and insulating ball insulator 14
And a turnbuckle 15 for applying tension to the wire 12,
A hook 16 for fixing, a ground current detector 17 connected to the wire 12, an alarm 18, and the like are provided. 8 and the housing posts 2 so that the wires 12 are parallel to the back surface of the hair clipper 10 at a predetermined distance.
a.

The diameter of the stainless steel wire 12 is to prevent injuries when a worker accidentally gets caught on a maintenance day, etc.
6m that satisfies the two items of securing strength when tension is applied
m, and both ends are fixed around the outer circumferential groove of the ball insulator 14 by winding. The voltage applied to the stainless wire 12 is about 8 volts AC, and there is no electric shock to the human body.
2 and the housing post 2a are insulated to prevent malfunction due to leakage current.

As the ball insulator 14, two types, large and small, are commercially available, but the smaller one having a size of 60 mm is used (see FIG. 3). Further, at or near one of the ball insulators 14, the electric cable 19 of the ground current detector 17 is provided.
Is connected to the stainless steel wire 12 so that an AC voltage of 8 volts can be applied to the stainless steel wire 12. It should be noted that the insulator is not limited to the ball insulator, but may be another insulator having another strength.

A base of a connecting wire 20 is wound around another outer circumferential groove of each ball insulator 14, one connecting wire 20 is connected to a hook 16 via a turnbuckle 15, and the other connecting wire 20 is directly connected to the hook 16. Connect to hook 16. The turnbuckle 15 introduces tension into the stainless wire 12 and prevents the stainless wire 12 from vibrating due to strong vibration during rolling and coming into contact with the deformed hairpin 10 to prevent malfunction. The tension member is not limited to the turnbuckle, but may be any member that can apply tension, such as a chain block.

The hook 16 is fixed to the inner surface of the housing post 2a by welding or the like. This fixing member is not limited to the hook, but may be any as long as it can be fixed. The turnbuckle 15, hook 16, and connection wire 20 are
As with the disk 13, it is made of stainless steel to prevent corrosion.

The stainless steel disk 13 is positioned at the center of the hair clip 10 in the longitudinal direction.
Fixed to For example, as shown in FIG. 3, a disk 13a is attached to a crimping pipe 13b through which a stainless steel wire 12 can be inserted.
Is fixed to the stainless steel wire 12 by crimping both ends of the crimping pipe 13b.
The diameter of the disk 13a is 70-80 mm, which is larger than the ball insulator 14 of 60 mm. If it is smaller than the ball insulator 14, the deformed hair clip 10 hits the ball insulator 14 and cannot detect a slight deformation. Therefore, the vibration of the hair clipper 10 during rolling is transmitted, and the ball insulator 14 is damaged.

The detection projection is not limited to the disk 13a, but may be a rectangle or an oval (see FIGS. 3C and 3D). In addition, the disk 13a and the crimping pipe 13b
It is preferably made of stainless steel, but may be made of copper. At the time of detection, the fixing position of the hook 16 is determined and set so that the gap δ (see FIG. 2C) between the stainless steel disk 12 and the rivet 10 is 10 to 30 mm, and detection is performed.

The grounding current detector 17 has an AC power supply of 8 volts and a grounding determination function using a semiconductor. The power supply voltage of the main body of the apparatus is AC 100 volts. As shown in FIG. 10 is deformed and stainless disk 1
3 and outputs a ground current detection signal by detecting a ground current flowing when the touch panel 3 is touched. The same detection is performed when the opposite side of the hairpin 10 is deformed.

As the grounding current detector 17, a device generally used as a device for detecting the height of the liquid level or the like with an electrode rod suspended vertically can be used.
In the present invention, such a general-purpose device is modified to add a variable resistor for sensitivity adjustment, a timer for preventing malfunction due to chattering and the like. This timer is
It is for setting how many seconds the hair disc 10 and the stainless steel disk are kept in contact with each other to determine the detection and output an alarm.

The alarm 18 is a device that operates upon receiving a ground current detection signal from the ground current detector 17, and is installed in the operator's cab of a steel plate rolling mill, and uses a buzzer, a red light, or the like to detect deformation of the barren 10. Let them know. Conventionally,
Since there is no device for detecting the bending loss of the variken, the operator performs a visual inspection about once an hour, but in the present invention,
It is possible to automatically and surely detect the deformation of the hair clipper within a small amount, and by taking appropriate measures, a serious accident can be prevented beforehand and a long pause can be prevented.

The following tests were actually performed using the thus-configured hair loss detecting apparatus.

[Operation Test] Since the hair clip 10 cannot be intentionally bent, the stainless steel disk 13 and the hair clip 10 were forcibly short-circuited with a wire or the like. As a result, 1
It was confirmed that the operation was accurate to 00%.

[Malfunction test] The gap δ between the hair clipper 10 and the stainless steel disk 13 was set to 15 mm and 30 mm,
The variable resistor for adjusting the sensitivity of the ground current detector 17 is 6.48.
When kΩ (sensitivity 1) and 5 kΩ (sensitivity 2) were set and the chattering prevention timer was set at 1 to 5 seconds, the number of malfunctions n times / day was recorded and evaluated. The results are as shown in Table 1. From this table, it can be seen that the number of malfunctions is extremely small, about once a day at most, and there is no practical problem.

[0036]

[Table 1]

Table 2 shows the advantages and disadvantages of the present invention and the prior art.
An example in which the construction cost and feasibility are compared is shown (limited to the case where the sensor is grounded between the hair clipper and the feed roller).

[0038]

[Table 2]

Although the present invention has a drawback in that the continuous displacement amount of the variable pad cannot be continuously monitored, the gap between the variable pad and the detection disk is reduced because the on / off accuracy is high and reliable detection is possible. By setting the deformation amount smaller than the dangerous area, the hair clipper can be reliably protected, and this drawback does not cause any problem.

Although the above description has been given of the barren of a steel plate rolling mill, the present invention is not limited to this. It goes without saying that the detection device of the present invention can also be applied to detection.

[0041]

As described above, according to the present invention, a detecting body such as a stainless steel wire is stretched between the housing posts between the bottom work roll and the feeder roller, and the ground current caused by the contact between the trimmer and the detecting body is detected. The following effects are achieved because the detection is performed by the detector.

(1) Since the ground current caused by contact with the hair clipper is detected, malfunctions are extremely small even in a poor environment such as high temperature, submergence, vibration, etc., and the bending loss of the hair clipper can be reliably detected.

(2) Even in a bad environment, no special protective measures are required for the sensor part, no special waterproof / oilproof connector is required, the cost of the apparatus can be reduced, and maintenance and maintenance can be performed. It will be easier.

(3) Since the sensor portion has a simple configuration and does not require a waterproof / oil-proof connector, the number of failures is extremely small, so that long-term detection is possible even in a poor environment.

(4) Since the sensor base can be easily installed in a narrow space between the bottom work wheel and the feed roller without installing the sensor base, the construction cost of the sensor base and the foundation ground can be eliminated, and the sensor base can be installed at low cost. can do. Further, it can be installed even when there is a bottom backup roll such as a quadruple rolling mill. Further, there is no obstacle or restriction on the roll change and the maintenance work, and the work can be performed safely and easily.

[Brief description of the drawings]

FIG. 1 shows a basic structure of a barren bending loss detecting device in a steel plate rolling mill according to the present invention, wherein (a) is a side view and (b)
Is a plan view, and (c) is a partial plan view.

FIGS. 2A and 2B are an embodiment of a device for detecting bending loss in a thick steel plate rolling mill according to the present invention, wherein FIG. 2A is a plan view, FIG. 2B is a partial plan view, and FIG. It is.

3 shows each member of the hair loss detecting apparatus of FIG. 2;
(A) is a plan view of a ball insulator, (b) is a perspective view of a detection disk, and (c) and (d) are perspective views showing modified examples of the disk.

FIG. 4 is a plan view showing a detection state of the hair loss detecting apparatus of FIG. 2;

FIG. 5 shows a quadruple thick steel plate rolling mill, (a) is a side view,
(B) is a plan view, and (c) is a partial side view.

6 (a) to 6 (e) are side views showing various types of conventional hair loss detecting apparatuses.

FIGS. 7A and 7B show a hair loss detecting apparatus using a conventional sensor mount, wherein FIG. 7A is a plan view, FIG. 7B is a front view, and FIG.

[Explanation of symbols]

 A: Thick steel plate 1 ... Thick steel plate rolling mill 2 ... Mill housing 2a ... Housing post 3 ... Top work roll 4 ... Bottom work roll 5 ... Top backup roll 6 ... Bottom backup roll 7 ... Feed roller 8 ... Feed roller 9 ... Rolling down device DESCRIPTION OF SYMBOLS 10 ... Striker 11 ... Striker bending loss detector 12 ... Stainless steel wire 13 ... Stainless steel disc 14 ... Ball insulator 15 ... Turnbuckle 16 ... Hook 17 ... Ground current detector 18 ... Alarm 19 ... Electrical cable 20 ... Connection wire

Continued on the front page. (72) Inventor Tsutomu Hatazawa 3, Oaza Hikari, Kashima City, Ibaraki Prefecture Sumitomo Metal Industries, Ltd. Kashima Works, Ltd.

Claims (1)

[Claims] 1. A device for detecting deformation of a hair clip disposed between a bottom work roll and a feed roller of a steel plate rolling mill, wherein a rope-shaped detector is provided between the hair clip and the feed roller. Characterized in that a ground current detector capable of detecting a ground current caused by contact between the rope-shaped detection body and the barriken is connected to the rope-shaped detection body. Detection device.