JPS6186054A - Air cylinder device for supporting air sealing pipe for continuous casting - Google Patents

Abstract

PURPOSE:To prevent the excessive pressing of an air sealing pipe to a collector nozzle by supporting the air sealing pipe to a supporting device by the supporting force meeting the timing for casting. CONSTITUTION:A pressure setter 15 of an air cylinder device which supports the air sealing pipe is constituted of a reference pressure generating unit 16 which generates three different pressures; the pressure before the start of casting, the initial pressure for casting and the pressure during casting, a reference pressure change-over unit 17 which selectes one reference pressure and a pressure generator 18 which exerts the reference pressure to each one air cylinder 14. The supporting force which balances with the own weight of the air sealing pipe and the dynamic pressure of the molten steel is therefore generated at the top end of the beam 5 of the supporting device for the air sealing device in the initial period of casting and the supporting force which balances with the own weight of the air sealing pipe and the frictional force by the viscosity of the molten steel is generated during casting. The supporting force which balances with the air sealing pipe is generated before the start of casting and after the end of casting, by which the air sealing pipe is supported.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an air seal pipe for continuous casting at the tip of a beam, which is rotatably provided in the vertical direction, to a collector nozzle disposed below the dropper. Continuous casting that supports the air seal pipe with support force depending on the casting period and prevents excessive pressure from being applied to the collector nozzle, etc. This invention relates to an air cylinder device for supporting air seal pipes.

[Prior art and its problems]

In continuous casting, when taking molten steel from the ladle to the tundish, it is often necessary to prevent the molten steel from oxidizing. For this purpose, an air seal pipe is used at the bottom of the collector nozzle attached to the rotary nozzle at the bottom of the ladle. Conventionally, this air seal pipe is pressed and supported by a support device in which an aerosol pipe is swingably attached to one end of a lever and a counterweight is attached to the other end of the lever.

However, in a support device using such a counterweight, the counterweight must be significantly increased in order to balance the dynamic pressure of molten steel at the start of pouring, resulting in a lack of operability and safety. However, because the load from molten steel is reduced during pouring, a large counterweight is no longer required, which has the disadvantage of causing damage to the collector nozzle, rotary nozzle, and air pipe. .

Therefore, the present applicant recently proposed a support device for an air seal pipe that does not use a counterweight 'Th' (Utility Model Publication No. 59-27971). As shown in FIG. 2, this support device includes a horizontally rotatable first arm 3 provided on a column 2 provided on a lifting deck 1 of a ladle car.
A vertically rotatable beam 5 with an air seal pipe 4 attached to its tip is attached to the upper part of the arm 3 via a horizontally rotatable pivot seat 6, while a horizontally rotatable beam 5 is attached to the lower part of the first arm 3. A second arm 7 is attached, and an air cylinder 8 is provided between the beam 5 and the second arm 7.

Note that 9 is an operating handle for the beam 5, and 10 is an operating device for controlling the air cylinder 8.

According to this support device, since the beam 5 is attached to the support column 2 by a link mechanism consisting of the first arm 3 and the like, the air seal pipe 4t- at the tip of the beam 5 and the collector attached to the rotary nozzle 12 at the bottom of the cider 11 The air seal pipe 4 can be smoothly moved to a position below the nozzle 13 and come into contact with the collector nozzle 13. By applying compressed air at an appropriate pressure to the air cylinder 8, the air seal pipe 4 can be supported by changing the supporting force of the support device. That is, at the beginning of casting, the air seal pipe 4 is supported with a supporting force that takes into account the dynamic pressure of the molten steel that starts flowing from the ladle 11, and during casting, the air seal pipe 4 is supported with a supporting force that takes into account the frictional force caused by the viscosity of the molten steel. 4 can be supported. Therefore,
Unlike a support device using a counterweight, there is no problem that the support force becomes too large during casting and the air seal pipe 4 is pressed against the collector nozzle 13 with an excessive pressing force.

In this way, the support device using the air cylinder 8 can support the air seal pipe 4 with an appropriate supporting force by applying compressed air at an appropriate pressure to the air cylinder 8 depending on the timing of casting. I can do it. Therefore, in this support device, it is important that an appropriate pressure is applied to the air cylinder 8 so that a supporting force corresponding to the timing of casting can be obtained.

If too much pressure is applied to the air cylinder 8 and too large a supporting force is generated, the air seal pipe 4 will be supported by being pushed against the collector nozzle 13 excessively, causing the same problem as a support device using a counterweight tracker. will occur.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a support air cylinder device for use in a support device for an air seal pipe for continuous casting, which is capable of supporting an air seal pipe with a supporting force depending on the timing of casting. shall be.

[Summary of the Invention] The air cylinder device for supporting an air seal pipe for continuous casting of the present invention includes a device for supporting an air seal pipe for continuous casting that is attached to the tip of a beam by abutting against a collector nozzle below a ladle. An air cylinder device comprising: an air cylinder between the beam and a column provided with the beam rotatable in the vertical direction; and a pressure setting device that generates and sets the pressure necessary for the air cylinder in the air cylinder. The pressure setting device includes a reference pressure for generating a pre-casting start pressure necessary to support the air seal pipe before starting casting, and a reference pressure for generating a pre-casting start pressure necessary to support the air seal pipe at the initial stage of casting. The standard pressure for generating initial casting pressure to generate the initial casting pressure necessary for the casting process, and the standard pressure for generating pressure during casting to generate the casting pressure necessary to support the air seal pipe during casting. a reference pressure generation unit that generates different reference pressures; a reference pressure switching unit that selects one of the three different reference pressures generated by the reference pressure generation unit; and an operation unit that operates the reference pressure switching unit; Based on each of the reference pressure for generating pressure before starting casting, the standard pressure for generating initial casting pressure, and the standard pressure for generating pressure during casting selected by the standard pressure switching unit, the pressure before starting casting, initial casting pressure, and pressure during casting are set. and a pressure generator that generates pressure and applies it to the air cylinder one by one.

[Structure of the invention]

Hereinafter, this invention will be explained in detail based on the drawings.

FIG. 1 shows a part of an air seal pipe support device to which the air cylinder device of the present invention is attached. In FIG. 1, 14 is an air cylinder with a locking mechanism of the air cylinder device, and 15 is a reference pressure generation unit 1-16, a reference pressure switching unit 17, and a pressure generator 18 that constitute a pressure setting device for the air cylinder 14. The pressure setting section 19 is an operation section provided with a pressure setting operation unit 20 that also constitutes a pressure setting device.

3. A first arm horizontally rotatably attached to a support (not shown) provided on the lifting deck of the ladder car; 5;
7 is a beam attached to the upper part of the first arm 3 so as to be vertically rotatable via a horizontally rotatable swivel seat 6, and an air seal pipe (not shown) is attached to the tip; The second arm is horizontally rotatably attached to the lower part of the
Like the first arm 3 and the like in FIG. 2, it constitutes a support device for the air seal pipe.

In the air cylinder device of the present invention, the reference pressure generation unit 16 generates a reference pressure for generating the necessary pressure in the air cylinder 14 depending on the timing of casting, and the pressure setting operation unit 20 operates the switching unit 17. Then, the switching unit 17 selects the reference pressure, and the pressure generator 1
At step 8, necessary pressure is generated based on the reference pressure and applied to the air cylinder 14.

Here, the pressure required depending on the timing of casting is the pre-casting pressure that can generate a supporting force that balances the air seal pipe's own weight to support the air seal pipe before the start of casting, and the pressure that is required at the beginning of casting. Initial casting pressure that can generate a supporting force that balances the air seal pipe's own weight and the dynamic pressure of molten steel to support the air seal pipe during casting, and the air seal pipe's own weight to support the air seal pipe during casting. and the pressure during pouring that can generate a supporting force that balances the frictional force due to the viscosity of the molten steel.

Of these, the pre-casting pressure is the system that supports the air noll pipe with a supporting force that balances the air seal pipe's own weight before starting casting or after finishing casting, and allows the air seal pipe to easily come into contact with the collector nozzle manually. , so that it can be removed from the collector nozzle.

The reference pressure generation unit 16 is for generating a reference pressure for generating the above-mentioned three different pressures in the pressure generator 18, and the same pressure as the above-mentioned three different pressures is used as the reference pressure.

The unit 16 includes a pressure tank (not shown) and piping 21.
Three different reference pressures can be obtained simultaneously by adjusting the pressure of the compressed air sent through, for example, by three pressure reducing valves connected in parallel. The reference pressure for generating pressure before starting casting, the reference pressure for generating initial pressure during casting, and the reference pressure for generating pressure during casting generated in unit 16 are applied to the reference pressure switching unit 17 at the same time.

The reference pressure switching unit 17 is for selecting one of the three different reference pressures generated by the external reference pressure generation unit 16, and is configured by, for example, connecting three air-operated valves each having two ports in parallel. The three reference pressures are configured such that each of the three reference pressures is applied to a corresponding air operated valve. The unit 17 is operated by a pressure setting operation unit 20 provided in the operation section 19. The reference pressure for pressure generation selected in unit 17 is
Applied to pressure generator 18.

The pressure generator 18 consists of, for example, a pilot pressure reducing valve,
Based on each of the reference pressure for generating pressure before starting casting, the reference pressure for generating initial pressure during casting, and the reference pressure for generating pressure during casting, which are applied from the reference pressure switching unit 17,
The pressure of compressed air sent through the entire pipe 21 from a pressure tank (not shown) is adjusted to generate a pressure before starting casting, an initial pressure during casting, and a pressure during casting. Pressure generator 1
The pre-casting pressure, the initial casting pressure, and the pressure during casting generated in step 8 are transferred to the air cylinder 14 through the piping 22.
added to.

The pressure setting operation unit 20 is for operating the reference pressure switching unit 17 to select one of three different pressure generation reference pressures applied to the unit 17 and applying it to the pressure generator 18. Pressure tank (not shown)
It consists of manually operated valves 24 and 25 connected in parallel to the piping 23 from and a manually operated valve 26 connected in series to the manually operated valve 25.

The manual operation valve 24 is an operation valve for selecting a reference pressure for generating pressure before starting casting.

Position 1 of the valve 24 is the position before starting casting, and the pressure from the pipe 23 is applied as a signal pressure to the reference pressure switching unit 17, so that the unit 17 selects the reference pressure for generating pressure before starting casting. . The position j of the valve 24 is the stop position of the air seal pipe support device, which cuts off pressure from the pipe 23 and prevents it from being applied to the pipe 22) 17. At position i, the reference pressure for generating pressure before starting casting is selected by the reference pressure switching unit 17, and the pressure generator 18
Pressure is generated before starting casting, and the air cylinder 14 generates a supporting force at the tip of the beam 5 that balances the weight of the air seal pipe to support the air seal pipe.

The manual operation valve 26 is an operation valve for selecting a reference pressure for generating initial casting pressure and a reference pressure for generating pressure during casting. Position t of the valve 26 is the position at the initial stage of casting, and the pressure from the pipe 23 that is applied all the way through the manually operated pulp 25 is applied to the unit 17 as a signal pressure, and the unit 17 is set to the reference pressure for generating the initial casting pressure. It is designed to let you choose. The valve 26 is in the position during casting, and the pipe 2 is also in the position during casting.
In addition to unit) 17, the pressure from 3 is used as a signal pressure,
The unit 17 is configured to select a reference pressure for generating pressure during pouring.

At position t, the reference pressure for generating initial casting pressure is selected by the reference pressure switching unit 17, the initial casting pressure is generated by the pressure generator 18, and the air cylinder 14 applies the dead weight of the air seal pipe and the molten steel to the tip of the beam 5. It supports the air seal pipe by generating a supporting force that balances with the dynamic pressure.

At position k, the reference pressure for generating pressure during pouring is similarly selected, pressure during pouring is generated, and the air cylinder 14 is applied to the tip of the beam 5 to balance the dead weight of the air seal pipe and the frictional force due to the viscosity of the molten steel. Generates supporting force and fully supports the air seal pipe.

Manual operation valve 25 is a transmission valve for transmitting pressure from piping 23 to manual operation valve 26 . The pressure in the pipe 23 is transmitted to the valve 26 at the transmission position m of the valve 25, and is shut off at the shutoff position n.

The manually operated valve described above is operated as follows during casting work.

First, the manually operated pulp 24 is placed in position 1 before the start of casting when the entire air seal pipe support device is used. This allows the air cylinder 14 to always generate a supporting force at the tip of the beam 5 that balances the weight of the air seal pipe to support the air seal pipe at times other than during the initial casting and during casting operations. can.

Next, when bringing the air seal pipe into contact with the collector nozzle or separating it from the collector nozzle,
The manually operated pulp 24 is set at position i before the start of casting, and the manually operated pulp 2511 is set at position n where it is shut off. As a result, the air cylinder 14 generates the full supporting force that balances the weight of the air seal pipe at the tip of the beam 5, as described above, so that the air seal pipe can be easily brought into contact with the collector nozzle by hand, and the collector nozzle It can be removed from.

Next, after bringing the air seal pipe into contact with the collector nozzle, the manually operated pulp 25 is set to the transmission position m,
Manually operated pulp 26 is brought to position t at the initial stage of casting. As a result, the air cylinder 14 generates a supporting force at the tip of the beam 5 that balances the weight of the air seal pipe and the dynamic pressure of the molten steel, and thus starts pouring the molten steel through the air seal pipe.

Next, after a certain period of time has elapsed since the start of casting, the manually operated pulp 26f is switched to position k during casting. As a result, the air cylinder 14 generates a supporting force at the tip of the beam 5 that balances the weight of the air seal pipe and the frictional force due to the viscosity of the molten steel, thereby supporting the air seal pipe.

Next, when the casting is completed, the manually operated pulp 25 is switched to the shutoff position 7 (n), the air seal pipe is manually removed from the collector nozzle and returned to the opposite position, and the manually operated pulp 24 is switched to the stop position j. Bye.

In FIG. 1, 27 is an alarm generation unit provided in the pressure setting section 15, and 28 is an alarm operation unit provided in the operation section 19. The alarm generation unit 27 activates the air operated pulp 2 of the alarm operation unit 28 when the pressure applied to the air cylinder 14 reaches a predetermined alarm generation pressure.
The signal pressure is output to 9. As a result, the air-operated pulp 29 is switched to the lock position p, the pressure in the pipe 23 applied through the manually-operated pulp 30 is cut off, and the air cylinder 14 is locked. The alarm generating unit 27 is set on and set off by a manually operated pulp 31.

Therefore, according to the air cylinder device of the present invention, at the tip of the beam 5 of the support device for the air seal pipe, a supporting force that balances the weight of the air seal pipe and the dynamic pressure of the molten steel is generated at the tip of the beam 5 during the casting process. To do this, a supporting force is generated that balances the air seal pipe's own weight and the frictional force due to the viscosity of the molten steel, and before the start of casting and after the end of casting, a supporting force that balances the air nol pipe's own weight is generated. Can support air seal pipes. Therefore, the air 7-le pipe will not be pressed against the collector nozzle with excessive pressure.
The collector nozzle and air seal pipe will not be damaged, and the rotary nozzle will not require large rotational force when rotating.

〔Effect of the invention〕

According to the air cylinder device of the present invention, it is possible for the air seal pipe support device to support the air seal pipe with a supporting force that corresponds to the timing of casting. Therefore, the air seal pipe can be supported while preventing excessive pressing force from being applied to the collector nozzle and the like.

[Brief explanation of drawings]

FIG. 1 is a side view showing a part of an air seal pipe support device to which the air cylinder device of the present invention is attached, and FIG. 2 is a side view of the air seal pipe support device using an air cylinder. In the drawing, 2... Strut, 3... First arm, 4...
...Air 7-le vipe, 5...Beam, 6...Swivel seat, 7...Second arm, 8.14...Air/lifter, 11...Dollar, 12...Rotary Nozzle, 13... Collector nozzle, 15... Pressure setting section, 16... Reference pressure generation unit, 17... Reference pressure switching unit, 18... Pressure generator, 19... Operation section, 20
... Pressure setting operation unit, 21.22.23 ... Piping, 24.25, 26, 30.31 ... Manual operation knob, 27 ... Alarm generation unit, 29 ... Air operation knob Kurup.

Claims (1)

[Scope of Claims] The beam is provided with a column rotatable in the vertical direction for supporting an air seal pipe for continuous casting attached to the tip of the beam in contact with a collector nozzle below the ladle; An air cylinder device comprising an air cylinder between the beam and a pressure setting device that generates and sets a necessary pressure in the air cylinder, wherein the pressure setting device is configured to set an air seal before starting casting. Reference pressure for generating pre-casting pressure necessary to support the pipe, initial casting pressure generation necessary to support the air seal pipe at the initial stage of casting. 3 of the reference pressure for generating pressure during casting to generate the pressure during casting necessary to support the air seal pipe during casting.
a reference pressure generation unit that generates three different reference pressures, and a reference pressure switching unit that selects one of the three different reference pressures generated by the reference pressure generation unit;
an operation unit that operates the reference pressure switching unit; and a reference pressure for generating pressure before starting casting, a reference pressure for generating initial pressure during casting, and a reference pressure for generating pressure during casting selected by the reference pressure switching unit. An air cylinder device for supporting an air seal pipe for continuous casting, comprising a pressure generator that generates a pressure before starting casting, an initial pressure during casting, and a pressure during casting and applies them to the air cylinder one by one.