JP3357533B2 - Metal ribbon break detection method, conveyor and method of conveyance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for manufacturing a metal ribbon by a quenching method, and more particularly, to a method for detecting breakage of the metal ribbon during the production of the metal ribbon, a conveyor for transportation, and a transportation method.

[0002]

2. Description of the Related Art In recent years, a technique for manufacturing a thin metal ribbon by rapidly cooling a molten metal after casting has been actively developed. Among them, as a technique for winding the manufactured metal ribbon into a coil shape, as disclosed in Japanese Patent Application Laid-Open No. 57-94453, between two cooling rolls 1 rotating at high speed (in the case of a single roll, After the molten metal 13 is injected through a slit-shaped nozzle 15 on the surface and rapidly solidified to form an amorphous metal ribbon 2, a take-up reel having a magnet adjacent to the cooling roll 1 immediately embedded therein. 9 shows a metal ribbon (hereinafter simply referred to as a ribbon)
2 (see FIG. 8). This method can be said to be a skillful technique in which the winding machine 9 is disposed in the vicinity of the cooling roll 1 so that troublesome conveyance of the ribbon 2 becomes unnecessary.

[0003] However, this method is not necessarily suitable for industrial production of thin strips, since the winder 9 is too close to the cooling roll 1. In other words, it is not possible to secure a space for arranging an inspection device and a tension control device for checking defects such as a thickness and a hole of the manufactured ribbon 2 on a production line. Absent.

Accordingly, the present applicant has proposed a method of winding the ribbon 2 away from the cooling roll 1 as disclosed in Japanese Unexamined Patent Publication No. Hei.
The technology described in 106543 was proposed. As shown in FIG. 9, after the ribbon 2 is peeled off from the cooling roll 1, the air ribbon generated by the suction blower 7 causes the ribbon 2 to pass through the transport guide 4, and the pinch roll 5 loaded on the transport vehicle 6. The thin ribbon 2 is guided by the pinch roll 5, captured by the pinch roll 5, and crushed at the tip of the thin ribbon 2 by a crusher (blower) 7 behind the pinch roll 5 while applying tension to the thin ribbon 2 by the pinch roll 5. This is a method in which the transport carriage 6 is moved to be guided to the winder 9 and wound by the winder 9 in a coil shape.

However, Japanese Patent Application Laid-Open No. Hei 3-10654 discloses
According to the winding method described in Japanese Patent Publication No. 3 (1995) -1991, when the ribbon 2 is broken after the start of transport, it is difficult to capture and transport the ribbon 2 again. The reason is that the sheet making speed (peripheral speed of the cooling roll) of the ribbon 2 is usually 15 m / sec or more, and the subsequent ribbon 2 overflows into the line in an instant to cool the carrier 6. This is because it becomes impossible to return to the vicinity of the roll 1. Further, the inspection device and the like cannot be used unless they are once cleaned. Moreover, in this winding method, the breakage of the ribbon is detected by a sudden change in the height of the dancer roll 16 or the tension meter 17 of the ribbon disposed on the transport line to sharply decrease the tension. It is effective only after the belt 2 is guided to the winding machine and the dancer roll 16 and the tensiometer 17 are properly operated, and there is also a disadvantage that the break cannot be detected until the proper operation.

[0006] On the other hand, Japanese Patent Publication No. 6-73704 discloses an air suction type conveyor (hereinafter referred to as a suction conveyor) instead of using the pinch roll for the thin ribbon conveyance in the winding method described in Japanese Patent Application Laid-Open No. 3-106543. ), And use the carousel reel (two reels can be used alternately)
It discloses a method of transporting the product up to When this winding method is used, one direction of the suction conveyor is changed (for example, downward) when the ribbon breaks, so that the subsequent ribbon after the break can be discharged to the pit. Consideration is given to avoiding troubles on the transport line due to the broken ribbon.

[0007] However, since the plate making speed of the cooling roll is very high, it is too late if the direction of the suction conveyor is not changed instantaneously. There was no description, and the problem was how to find the fracture early.

[0008]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a method for instantaneously and accurately detecting a break in a ribbon during the period from the start to the end of ribbon production by a quenching method, and a method thereof. It is an object of the present invention to provide a thin-film transport conveyor and a transport method used.

[0009]

In order to achieve the above object, the inventor of the present invention has intensively studied a method for detecting the breakage of a ribbon at an early stage, easily and reliably. Attention was paid to fluctuations in air pressure in the decompression chamber of the conveyer or fluctuations in power of the cooling roll and the motor for driving the air suction type conveyer. That is, according to the present invention, molten metal is injected through a slit-shaped nozzle onto the surface of a cooling roll that rotates at high speed, rapidly solidified to form a metal ribbon, and then the metal ribbon is peeled off from the cooling roll to suck air. When guided to a winding device by a type conveyor and wound up in a coil shape, the pressure in the decompression chamber of the air suction type conveyor is always measured, or the cooling roll, the power value of the driving motor of the air suction type conveyor is measured. It is a method for detecting a break in a metal ribbon, which measures the fracture of the metal ribbon based on the measured values. The present invention, which relates to an apparatus used for actual production of a ribbon, comprises a conveyor belt made of a porous material and a pressure-reducing chamber for sucking and exhausting air above the conveyor belt. In the conveyor, a pressure gauge that measures the internal pressure of the decompression chamber, and the measured pressure value is compared with a reference value, or a cooling roll,
A measuring device for measuring a power value of a driving motor of the air suction type conveyor, and a calculator for comparing the measured power value with a reference value and transmitting an output signal thereof to the inclination changing means of the conveyor. A conveyor for transporting a thin metal ribbon, characterized in that: Further, the present invention provides a computer for the metal ribbon transport conveyor, wherein the pressure of the metal ribbon guide conveyor decompression chamber attached to the transport trolley, the power of the motor for driving the cooling roll, and the driving of the air suction type conveyor are provided. Inputting data of at least one of the power of a motor for use, a change in height of a dancer roll, and a tensiometer to detect breakage of a metal ribbon, and tilting the metal transport conveyor. It is also a transport method.

In this case, there are two types of air suction type conveyors, a ribbon guiding conveyor provided on the transporting vehicle side, and a ribbon transporting conveyor which is tiltable on the cooling roll side. In this specification, both are called suction conveyors,
The former is distinguished as a symbol 10b, and the latter as 10a.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a molten metal is injected through a slit-shaped nozzle onto the surface of a cooling roll rotating at a high speed, and rapidly solidified to form a metal ribbon. From the air suction type conveyor to the take-up device, when winding in a coil shape, the pressure of the decompression chamber of the air suction type conveyor, the power of the motor for driving the cooling roll, and the driving of the air suction type conveyor Since the power of the motor was constantly measured and the breakage of the metal ribbon was determined based on the measured values, the breakage of the ribbon was instantaneous and instantaneous from the start to the end of the ribbon casting by the quenching method. It becomes possible to detect accurately.

Further, according to the present invention, in a tiltable metal ribbon transporting conveyor provided with a conveyor belt made of a porous material and a decompression chamber for sucking and discharging air above the conveyor belt, the decompression chamber includes A pressure gauge for measuring the internal pressure, or a measurement gauge for measuring the power of the drive motor of the cooling roll or the air suction type conveyor, comparing these measured values with a reference value, and outputting the output signal to the inclination changing means of the conveyor. With the provision of an arithmetic unit for transmitting, when a ribbon breaks, the subsequent ribbon can be discharged to the pit, and a transport system for the ribbon is created again, so that the operation can be started early. It will be possible to revive. Furthermore, the present invention relates to the above-mentioned arithmetic unit of the metal ribbon transporting conveyor, the pressure reducing chamber pressure of the metal ribbon guiding conveyor attached to the transporting trolley, the power of the motor for driving the cooling roll and the air suction type conveyor, and the dancer roll. The change in height and the data of at least one of the tensiometers are input to detect breakage of the metal ribbon, and the metal transport conveyor is tilted, so that the ribbon break can be detected at the closest position. As a result, early detection can be reliably performed.

Hereinafter, in the embodiment, FIGS.
The contents of the present invention will be specifically described based on FIG.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, FIGS. 1 to 5 show an entire configuration of a ribbon production line in which a method for detecting a break of a ribbon according to the present invention is performed. The production of the ribbon is performed by slit nozzle 1 from tundish 14
It starts by pouring the molten metal 13 through the surface 5 onto the surface of the cooling roll 1 rotating at high speed. Then, as shown in FIG. 1, the molten metal is rapidly solidified on the cooling roll 1 to form a ribbon, which is separated from the cooling roll 1 by the air knife 3, and the suction conveyor 10a for conveyance and the suction conveyor 1 for guiding.
0b, supported by the transport carriage 6 and the like. The carrier 6 guides the leading end of the ribbon 2 to, for example, a carousel-type winder 9 while breaking the leading end of the ribbon 2 with a blower 7 (FIG. 2). Then, the leading end of the ribbon is gripped by the take-up reel as shown in FIG. 3, and winding is started. At this time, a dancer roll 16 and a tension meter 17 for adjusting the tension of the ribbon 2 or the inspection device 18 and the like are set from the side of the line. next,
When the ribbon 2 breaks on the cooling roll 1, it is detected by a detection method according to the present invention described later, and the suction conveyor 10 a
Is tilted downward (see FIG. 4), and the subsequent ribbon 2 is sent to the discharge pit 11. Then, the carriage 6 is immediately returned to the position of the cooling roll 1 to reconfigure the winding work line (see FIG. 5).

As shown in FIG. 6 (a), the suction conveyors 10a and 10b are generally used to supply air 19 above a conveyor belt 12 made of a porous material to a box body having an upper plate provided with a large number of through holes. Suction is performed via the upper plate 20), the thin strip 2 is adsorbed to the surface of the conveyor belt 12 by the suction force, and the belt is rotated forward to rotate. Specifically, the rotation speed of the conveyor belt 12 is set to be higher than the traveling speed of the ribbon 2 so that the ribbon 2 does not jam on the conveyor belt 12 and tension is applied to the ribbon 2. The suction conveyor 10
Although there is no air suction on the delivery rollers a and 10b, the strip that has been sucked once may rotate with the belt and not peel off. In such a case, the peeling air 3 may be blown, as shown in FIG.

Incidentally, the method for detecting breakage of a ribbon according to the present invention is to constantly measure the pressure in the decompression chamber comprising the box 20. That is, the belt 2 is
6 and closes the through-hole (FIG. 6 (b)), the difference between the pressure in the decompression chamber and the atmospheric pressure increases, and the ribbon 2 is broken and Is not supplied to the belt and the ribbon 2 runs out on the belt (FIG. 6 (a)) or breaks on the conveyor (FIG. 6 (c))
State), since the entire area of the through hole (air suction hole) is increased, the difference between the pressure in the decompression chamber and the atmospheric pressure is instantaneously reduced. FIG. 7 shows the measurement results of the pressure difference adapted to these situations. In FIG. 7, a symbol D indicates a situation where the ribbon 2 is not completely present on the conveyor, a symbol A indicates a situation where the ribbon 2 is normally conveyed, and a symbol B indicates a situation where the ribbon 2 is broken. . Even if the ribbon 2 breaks, if the subsequent ribbon 2 is immediately and appropriately adsorbed on the conveyor belt 12, an impulse-like fracture signal is obtained as shown by a curve (1) in FIG.
When the following ribbon 2 did not come to the conveyor belt 12 after passing through the break, the value of the pressure difference was in the above-mentioned D state where there was no ribbon, as shown by the curve (2) in FIG. In the present invention, as shown in FIG. 6C, the suction conveyor 10a
A pressure gauge 21 and a computing unit 22 are attached to the decompression chamber to achieve smooth and quick implementation of the winding operation of the ribbon and the reconstruction of the line after breaking.

Further, as described above, the suction conveyor 10
Two a and b are used in the vicinity of the cooling roll 1 and one on the side of the transport vehicle 6 for guiding the ribbon 2. Since the breakage of the ribbon 2 occurs during the transport from the cooling roll 1 to the winding machine 9, both the suction conveyors 10a,
Both 10b are used for implementing the present invention. That is, it is preferable that the early detection of the break be detected near the position where the break occurs. In this case, the pressure change between the two suction conveyors is different, and if the break occurs upstream of the cooling roll side conveyor 10a, the curve (1) in FIG.
Pressure change occurs, and on the conveyor 10b attached to the transport vehicle, before the transport vehicle starts, the change in the curve (1) in FIG.
After the start, the change of the curve (2) in FIG. 7 occurs. When the ribbon breaks downstream of the cooling roll side conveyor 10a, no pressure change occurs in the conveyor 10a. In the conveyor 10b attached to the carriage, the curve (1) in FIG. 7 changes before the start of the carriage, and the curve (2) in FIG. 7 changes after the start. Of course, conveyor 1
If a break occurs downstream of the conveyor 10b,
No change in pressure occurs, and there is no problem in guiding to the winding machine by the conveyor and the conveyor 10b.

Further, in FIGS. 1 to 5, a dancer roll 16 and a tensiometer 17 are arranged in the transport line of the ribbon 2, and in the present invention, a sudden change in the dancer roll height and a sudden change in tension occur. The change can of course be used as a signal for ribbon breakage. In other words, after the winding of the thin ribbon 2 on the winding reel 9, the suction conveyor 10 b attached to the transport trolley is not normally used, so that after starting the winding, the suction of the dancer roll 16, the tension meter 17 and the cooling roll 1 side is performed. This is because it is better to detect the break by the conveyor 10a.

Next, a method of detecting breakage based on a change in the power of the motor for driving the cooling roll and a change in the power of the motor for driving the air suction type conveyor belt will be described. As shown in FIG. 10, the force acting between the belt of the conveyor 10a and the ribbon 2 is F1, the force acting between the belt of the conveyor 10b and the ribbon 2 is F2, and the force acting between the cooling roll 1 and the conveyor 10a is F1. The tension of the strip 2 is T1, the tension of the ribbon 2 between the conveyor 10a and the conveyor 10b is T2, the tension of the ribbon 2 from the conveyor 10b to the take-up reel 9 is T3, the cooling roll radius is r ₀ , and the conveyor 10a. driving pulley radius r ₁ of the drive pulley radius r ₂ of the conveyor 10b, and the outer diameter of the coil r ₃
And

The conveyors 10a and 10b suck the ribbon 2
While rotating at a higher speed than ribbon 2,
2 between the belt and the belt, frictional force is applied to the ribbon 2 in the traveling direction.
work. Therefore, the tension varies depending on the position of the ribbon 2.
ing. First, when winding the ribbon 2 into a coil,
The driving motor is T3 × r _Three Only when no load compared
Extra torque is required, and this torque is the winding tension of the coil.
Generate T3. That is, this T3 is controlled by the conveyor 10b.
F2, acting on the entry side of the conveyor 10b
I do. Then, at T3 and upstream of the T3,
The relationship with the used tension T2 is expressed as T2 = T3 + F2.
It is. Hereinafter, the conveyor 10a is similarly considered.
And the relationship of T1 = T2 + F1 is established. This T1 Zhang
The force is applied to the cooling roll 1 by T1 × r₀ Roll of torque
Apply in the direction. Therefore, (T1 × r₀ = (T3 +
F2 + F1) × r₀ ) Only the motor for driving the cooling roll 1
Will be less burdensome.

On the other hand, the belt of the conveyor 10a receives the force of F1 in the direction opposite to the rotation direction, and the drive motor of the belt is driven when no tension is applied to the upstream ribbon, that is,
F1 in torque compared to when the belt receives no force from the ribbon
× extra load of r ₁ is applied. In addition, the belt of the conveyor 10b receives the force of F2 in the direction opposite to the rotation direction, and the belt driving motor similarly applies an extra load of F2 × r2 with torque.

Subsequently, changes in the power of the cooling roll and the conveyor when a break occurs will be described with reference to the conceptual diagram of FIG. The power of the cooling roll 1, the belt of the conveyor 10a, and the power of the belt of the conveyor 10b usually take a substantially constant value in a steady state. When a break occurs, as shown in FIG. 11, the state differs depending on the break point (see FIG. 10), and is as follows. (1) Break example 1 (FIG. 11A): Conveyor 10a
Upstream Here, when it breaks, T1 = T2 = T3 = 0 until the thin strip 2 is captured again by the conveyor, the load of the motor for driving the cooling rolls increases, and the belt for driving the conveyors 10b and 10a is driven. The motor load is reduced. (2) Break example 2 (FIG. 11B): Conveyor 10a
And between the conveyor 10b, when broken, T1> 0, T2 = T3 = 0,
The load on the motor for driving the cooling roll 1 increases, and the conveyor 1
The load on the belt drive motor of Ob is reduced. Conveyor 10
The load of the belt drive motor a does not change. (3) Breakage example 3 (FIG. 11C): Conveyor 10b
If the fracture occurs here, T1> 0, T2> 0, T3> 0
The load conveyors 10b, 1
The load of the belt driving motor 0a does not change. Of course, when the thin strip 2 is not captured again, for example, after the start of the carriage, each power changes as shown by a broken line in FIG.
The width of change of these powers varies depending on the cooling roll radius, the moment of inertia, the specifications of the cooling roll drive motor, the suction pressure of the conveyor, the specifications of the conveyor drive motor, and the like.

When a break occurs during winding, the take-up reel is controlled so that T3 is constant.
The rotation speed of the reel suddenly increases, and changes to return to the original speed after the thin strip 2 is recaptured. Even when the reel speed is controlled by adjusting the position of the dancer roll so that the ribbon is not loosened, the speed of the reel suddenly increases due to breakage, and returns to the original speed after the ribbon 2 is re-captured. . This change can also be used for break detection.

Lastly, the situation after a break is detected will be described. In this case, the suction conveyor 10a according to the present invention, that is, the conveyor for transporting the thin metal ribbon can be effectively used. That is, as shown in FIG. 6 (c), the ribbon transport conveyor 10a according to the present invention transmits a pressure measurement value from a pressure gauge 21 provided in a decompression chamber to an arithmetic unit 22, and uses the value as a reference. Compared with the value, if it is necessary to tilt the conveyor 10a, the signal is transmitted to a tilting device (not shown). As a result, the conveyor 10
a tilts toward the discharge pit 11 side of the ribbon 2 provided thereunder, and the succeeding ribbon 2 continuously manufactured is discharged to the discharge pit 11.
Can be collected to While the ribbon 2 is being sent to the discharge pit 11, the conveyor 6 and the conveyor 10 b are returned to the cooling roll 1 side, and the suction conveyor 10 is
b, that is, the ribbon 2 is captured again by the ribbon guiding conveyor, and the transport line can be formed quickly. In the present invention, a signal from the conveyor 10b, the dancer roll 16, and the tensiometer 17 attached to the transport trolley is configured to be used to instruct the tilting of the ribbon transport conveyor 10a on the cooling roll side. It is also possible to help with detection.

[0025]

As described above, according to the present invention, even if a ribbon break occurs during the formation of a transport line, it can be detected instantaneously,
Until a system capable of capturing and transporting again is created, the action of carrying out unnecessary thin strips outside the line is performed instantaneously, and the line can be easily re-formed.

[Brief description of the drawings]

FIG. 1 is a diagram showing the start of guidance of a ribbon up to a winder in the production of a ribbon.

FIG. 2 is a diagram showing a state in which guidance up to a winder has been completed in the production of a ribbon.

FIG. 3 is a diagram showing the start of winding on a winding reel in the production of a ribbon.

FIG. 4 is a diagram showing a state immediately after the breakage of the ribbon in the production of the ribbon.

FIG. 5 is a diagram showing a reconstruction of a work line after a ribbon break in a ribbon production.

FIGS. 6A and 6B are diagrams of an air suction type conveyor, in which FIG. 6A shows a state in which a ribbon is not adsorbed, and FIG.
(C) shows the situation at the time of the breakage of the ribbon, and also shows that a pressure gauge and a computing unit are provided as a conveyor according to the present invention.

FIG. 7 is a diagram showing a pressure change in a suction conveyor decompression chamber when the ribbon break detection method according to the present invention is performed.

FIG. 8 is a diagram showing an apparatus for manufacturing a metal ribbon in which a cooling roll and a ribbon winding reel are close to each other.

FIG. 9 is a view showing a ribbon guiding method when the cooling roll and the ribbon winding reel are separated from each other.

FIG. 10 is an explanatory diagram of the present invention in which a break in a ribbon is determined by a change in power of a driving motor of a cooling roll and / or an air suction type conveyor.

11A and 11B are diagrams showing a change in power of a driving motor of a cooling roll and / or an air suction type conveyor when a break position of a ribbon is different, where FIG. 11A shows a break point example 1, and FIG. Breaking point example 2 and (c) show the case of breaking point example 3.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling roll 2 Metal ribbon (thin ribbon) 3 Air knife 4 Transport guide 5 Pinch roll 6 Transport cart 7 Suction blower 8 Deflor 9 Take-up reel (winding machine) 10a Suction conveyor on cooling roll side 10b Suction conveyor on transport cart side DESCRIPTION OF SYMBOLS 11 Discharge pit 12 Conveyor belt 13 Molten metal 14 Tundish 15 Slit nozzle 16 Dancer roll 17 Tensiometer 18 Inspection device 19 Air 20 Box (decompression chamber) 21 Pressure gauge 22 Computing unit 24 Ammeter 25 Motor

Continued on the front page (72) Inventor Tohru Sato 1 Kawasaki-cho, Chuo-ku, Chiba-shi Kawasaki Steel Corp. Inside Chiba Works (72) Inventor Kazuyuki Kato 1-Kawasaki-cho, Chuo-ku, Chiba-shi Kawasaki Steel Corp. Chiba Works (56) References JP-A-7-214251 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B22D 11/06 B22D 11/12 B22D 11/16 B65H 26/02

Claims (5)

(57) [Claims] 1. A molten metal is injected through a slit-shaped nozzle onto the surface of a cooling roll rotating at a high speed and rapidly solidified to form a thin metal ribbon. When guided to a winding device by a conveyor and wound in a coil shape, the pressure in the decompression chamber of the air suction type conveyor is constantly measured,
A method for detecting breakage of a metal ribbon, comprising determining a breakage of the metal ribbon based on the measured value. 2. A pressure-reducing chamber for transporting a thin metal ribbon, comprising a conveyor belt made of a porous material and a decompression chamber for sucking and exhausting air above the conveyor belt, wherein the internal pressure of the decompression chamber is measured. A pressure gauge, and a calculator for comparing the measured pressure value with a reference value and transmitting an output signal to a gradient changing means of the conveyor. 3. A molten metal is injected through a slit-shaped nozzle onto the surface of a cooling roll rotating at a high speed, rapidly solidified to form a metal ribbon, and the metal ribbon is peeled off from the cooling roll. When guided to a winding device by a conveyor and wound in a coil shape, the power of the driving motor of the cooling roll and / or the power of the driving motor of the air suction type conveyor belt are constantly measured, and the measured value is used as the measured value. A method for detecting a break in a metal ribbon based on the determination of a break in the metal ribbon based on the determination. 4. A conveyor belt made of a porous material for conveying a thin metal strip produced by injecting and solidifying molten metal onto a surface of a cooling roll rotating at high speed through a slit-shaped nozzle to a winding device; A tiltable metal strip conveyor having a decompression chamber for sucking and exhausting air above the conveyor belt, wherein the driving power of a motor for driving the cooling rolls and / or the driving of each of the air suction conveyor belts. A conveyor for transporting a thin metal ribbon, comprising: a measuring meter for measuring the power of a motor for use in a vehicle; and a calculator for comparing the measured value of the power with a reference value and transmitting an output signal to a conveyor inclination changing means. . 5. The arithmetic unit of the metal ribbon transporting conveyor according to claim 2 or 4, wherein the pressure in the pressure reducing chamber of the metal ribbon guiding conveyor attached to the transporting trolley, the power of the motor for driving the cooling roll, Inputting at least one of the power of a motor for driving an air suction type conveyor belt, a change in dancer roll height, and a tension meter to detect breakage of a metal ribbon and tilt the metal conveyor. A method of transporting a metal ribbon.