JPH054927Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a side weir pressing force control device for a twin-drum continuous thin plate casting machine.

[Conventional technology]

In conventional side weirs, several sides of the side weir are pressed against the end surface of the cooling drum with a constant pressing force from the start to the end of casting.

[Problem that the invention attempts to solve]

With conventional side weirs, thermal deformation due to heating of the side weirs creates a gap between the cooling drum end face and the sliding part of the side weir, forming a hot water pitcher, which gradually becomes thicker.
It had also grown large and was causing hot water leaks.

Furthermore, if the side weir is constantly pressed against the end surface of the cooling drum with a large pressing force to prevent the jug from becoming too large, there is a drawback that the side weir sliding portion will be seriously damaged and the jug will become larger.

In order to eliminate such problems, this invention
This paper proposes a device for controlling the pressing force of a side weir.

[Means for solving problems]

The present invention is a device for detecting the vibration of the side weir and a device for selecting the vibration component of the same vibration in the direction of the drum axis in a pressing force control device for the side weir of a thin plate continuous casting machine that has a side weir pressed against the end face of the cooling drum. a signal processing device having a function of converting the vibration after sorting into an electric signal proportional to the amplitude, and a device that adjusts the pressing force of the side weir using the electric signal. It is a force control device.

[Function] According to the present invention, when the side weir is thermally deformed due to heating and a gap is created between the cooling drum end face and the side weir sliding surface and a hot water gag is generated, the gap will increase in size as the hot water gag grows. Vibration in the axial direction of the cooling drum of the side weir is detected by installing a vibration meter or accelerometer on the side weir itself, and a pressure source such as hydraulic pressure or air pressure is adjusted according to the detected signal, and the vibration of the side weir is adjusted. By increasing the pressing force against the end face of the cooling drum, the jug of hot water is prevented from growing too large and causing hot water to leak.

That is, when the jug is small, the vibration of the side weir in the axial direction of the cooling drum is small, but as the jug grows, the vibration increases. When the vibration increases to a certain level, the side weir pressing force is increased to stop the growth of the jug. If this state is maintained for a while, the large-grown hot water pitcher passes through the side dam due to the rotation of the cooling drum, so the size of the hot water pitcher at the side dam gradually becomes smaller. When this state is reached, the side weir pressing force is reduced again.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the device of the present invention.

In FIG. 1, a pair of cooling drums 1a, 1
b are arranged in parallel with a predetermined drum gap, and a side weir 2 is provided on the side of the cooling drums 1a and 1b.
a, 2b are pressed from frames 3a, 3b to cooling drums 1a, 1b via side weir pressing cylinders 4a, 4b, 4c, 4d.

The pressing force of the side weirs 2a, 2b against the cooling drums 1a, 1b is transmitted from pressure sources 7a, 7b, 7c, 7d to cylinders 4a, 4b, 4c, 4d via pressure regulating valves 8a, 8b, 8c, 8d. . on the other hand,
Accelerometers 5a, 5b, 5c, and 5d are attached to the side weirs 2a, 2b to detect vibrations in the axial direction of the cooling drums 1a, 1b of the side weirs 2a, 2b themselves.

During normal operation, the side weirs 2a, 2b vibrate at a constant frequency and amplitude in a direction perpendicular to the axis of the cooling drums 1a, 1b to prevent the molten metal from cooling and adhering to the side weirs 2a, 2b. Do this.

When there is no leakage between the side weirs 2a, 2b and the cooling drums 1a, 1b, the side weirs 2a, 2
The vibrations in the axial direction of the cooling drums 1a and 1b of the side weirs 2a and 2b are small, but as the leakage increases, the vibrations in the axial direction of the cooling drums 1a and 1b of the side weirs 2a and 2b become large.

The above vibration is first detected as acceleration by the accelerometers 5a, 5b, 5c, 5d attached to the side weirs 2a, 2b, and then the signal processing circuits 6a, 6
Processed in b, 6c, and 6d.

This signal processing extracts the same frequency as the frequency at which the side weirs 2a and 2b vibrate in the direction perpendicular to the axes of the cooling drums 1a and 1b, since the detected signal is acceleration and therefore contains many high frequency components. This is the purpose of removing high-frequency components using a low-pass filter. Further, processing is also performed in which the component that has passed through the low-pass filter obtains a DC voltage proportional to the amplitude of the vibration acceleration.
The processing circuits 6a, 6b, 6c, and 6d control pressure regulating valves 8a, 8b, and
Outputs a signal to control 8c and 8d. With these pressure regulating valves 8a, 8b, 8c, 8d control signals,
The pressure sent from the pressure sources 7a, 7b, 7c, 7d to the side weir pressing cylinders 4a, 4b, 4c, 4d is adjusted, thereby controlling the pressing force of the side weirs 2a, 2b onto the cooling drums 1a, 1b. .

[Effect of idea]

When the side weirs are heated and thermally deformed, a gap is created between the cooling drum and the side weirs and a molten metal is generated.However, by controlling the pressing force of the side dams using the device of the present invention, the molten metal slugs grow and the hot water is removed. This can prevent leakage.

Furthermore, by adjusting the pressing force of the side weir to an optimal value using the device of the present invention, the life of the refractory material installed on the sliding surface of the side weir can be extended.

[Brief explanation of drawings]

FIG. 1 is a view showing an embodiment of the device of the present invention as viewed from above the continuous casting device. 1a, 1b...Cooling drum, 2a, 2b...Side weir, 3a, 3b...Device frame, 4a, 4
b, 4c, 4d...Cylinder for side weir pressing, 5a, 5b, 5c, 5d...Accelerometer for vibration detection, 6a, 6b, 6c, 6d...Signal processing circuit, 7a, 7b, 7c, 7d... Pressure sources such as oil or air, 8a, 8b, 8c, 8d...pressure regulating valves.

Claims (1)

[Scope of utility model registration request] A pressing force control device for a side weir of a thin plate continuous casting machine having a side weir pressed against the end face of a cooling drum includes a device for detecting vibration of the side weir, and a function and sorting function for sorting the vibration component of the same vibration in the direction of the drum axis. 1. A side weir pressing force control device comprising: a signal processing device having a function of converting subsequent vibration into an electric signal proportional to amplitude; and a device adjusting the pressing force of a side weir using the electric signal.