JPH079103A - Air system for detecting gap - Google Patents

Abstract

PURPOSE:To provide a gap detecting instrument fitted to a roll stand for casting, etc., having a simple structure and high reliability at low cost. CONSTITUTION:The gap detecting part 20 is arranged between a spacer member 8 and a patching plate 9 fitted to each bearing box 3, 5 in the rolls 1, 4 and the part 20 is provided with an air blowing hole 22 and a seal material 23 surrounding the air blowing hole. The air pressure in an air supplying system connected with the air blowing hole 22 is detected with a pressure switch, and when the air pressure is lowered caused by the leakage with the gap detecting part 20, this system detects that the roll gap (g) is wider than the setting value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gap detecting air system for detecting a roll gap of a continuous casting facility. Generally, the width of the gap when the gap between two members fluctuates. The present invention relates to a device that can be used as a device for detecting.

[0002]

2. Description of the Related Art In continuous casting equipment, it is necessary to detect the gap between support rolls during casting, and to monitor and maintain the center position of casting so as not to deviate from a predetermined casting line. For such a purpose, conventionally, the roll gap is detected by the method shown in FIG.

FIG. 4 is a plan view of one conventional roll stand, and FIG. 5 is a front view showing the roll stand without the stand frame and hydraulic cylinders. In the figure, reference numeral 1 denotes a reference side roll, both ends of which are pivotally supported by a reference side bearing box 3 fixed on a stand frame 2. Reference numeral 4 denotes an anti-reference side roll arranged so as to face the reference side roll 1, and both ends of the roll 4 are axially supported by a movable bearing box 5 slidable by a guide mechanism (not shown). The anti-reference side roll 4 is adapted to be pushed by a hydraulic cylinder 7 via a press frame 6 attached to the back surface of the bearing box 5. Reference numeral 8 is a spacer provided between the reference side bearing box 3 and the movable bearing box 5, and the tip of the spacer is brought into contact with the backing plate 9 fixed to the bearing box 3 at four positions, that is, a predetermined roll gap. Keep G. And the slab 1 during casting
If there is a case where the anti-reference side roll 4 retracts due to the force from 0, the receding amount of the bearing box 5 is detected by the linear detector 11 that connects the both bearing boxes 3 and 5, and the receding amount is calculated as an electric value. The hydraulic cylinder 7 is pressure-controlled by converting into a signal.
In this way, the casting center is kept within a predetermined range.

Further, Japanese Patent Laid-Open No. 63-194854 discloses another method for keeping the roll gap at a predetermined value, in which gas is applied to the roll surface from a nozzle. This system indirectly controls the roll gap by monitoring the change in the pressure of the gas stagnant between the nozzle attached to the reference side and the roll surface.

The conventional method shown in FIG. 4 has the following problems. That is, since the detector 11 has to be attached to the bearing housings 3 and 5, the radiant heat of the slab (about 1000
It is necessary to protect the detector from (° C), and measures such as water cooling are necessary. Further, since the detector must be protected from the secondary cooling water for cooling the cast slab, it is necessary to take waterproof measures. Since a detector is required for each position where the roll gap is to be measured, it is expensive overall.

Further, in the method disclosed in the above publication, it is necessary to detect the relative positional change between the nozzle serving as the reference and the anti-reference side (movable) roll, which complicates the nozzle mounting mechanism, Moreover, as shown in the publication, a back pressure balance mechanism such as a diaphragm valve or a metal bellows is required to hold the reference position of the nozzle, which makes the device complicated and expensive.

[0007]

As described above, the conventional method has a problem that the apparatus becomes complicated and expensive. Further, the reliability of the device used in a bad environment such as continuous casting is poor.

The present invention has been made to solve the above problems, and an object thereof is to obtain an air system for gap detection, which has a simple structure, is inexpensive, and is highly reliable.

[0009]

A gap detecting air system according to the present invention is an apparatus for detecting a variable gap between two members, wherein an air port is provided at the tip of one of the members facing each other and the air port is surrounded. A gap detection unit provided with a sealing material and an air supply system connected to the air port, and the gap becomes equal to or larger than a set value by detecting a decrease in air pressure when air leaks from the gap detection unit. It is characterized by detecting that it has become. Here, in the case of the roll stand for continuous casting, the member for providing the gap detection unit corresponds to the spacer member or the backing plate on the reference side bearing box with which the spacer member abuts.

[0010]

In this system, when a predetermined air pressure is generated in the air supply system, the gap detection section is closed by the close contact between the two members facing each other and the sealing material, and no air leak occurs. For example, the roll gap is kept at the set value. On the other hand, when a gap is generated between the two members and the gap exceeds a predetermined crushing amount of the sealing material, air leaks from the gap, so that the air pressure decreases, and if the decrease in the air pressure is detected by, for example, a pressure switch. It can be seen that the gap has expanded beyond the set value.

[0011]

EXAMPLES The present invention will be described below based on examples in which it is applied as a roll gap detection system for continuous casting equipment.
FIG. 1 is a front view of one roll stand, and an enlarged view of a gap detecting portion thereof is additionally shown. FIG. 2 is a plan view of FIG. The roll stand and the hydraulic cylinder of FIG. 2 are omitted in FIG. Further, the same parts as those in FIG. 4 showing the conventional example are designated by the same reference numerals and the description thereof will be omitted.

The gap detecting section 20 in this embodiment is shown in FIG.
It is provided on the spacer 8 which is one member as shown in FIG. Specifically, a hole 21 that penetrates the two spacers 8a and 8b and the length adjusting shim 12 and the liner 13 attached to the tips thereof is provided, and the enlarged air port 22 is opened at the tip of the liner 13. ing. Here, a member including the two spacers 8a and 8b, the shim 12 and the liner 13 is collectively referred to as a "spacer member 8". The base end of the hole 21 is closed by the movable bearing box 5 to which the spacer member 8 is attached. Further, a sealing material 23 such as a rubber seal ring is provided on the inner peripheral surface of the air opening 22, and the air opening 22 is surrounded by the sealing material 23. Further, the crush amount a of the tip of the sealing material 23 is set to a value within the allowable range of the roll gap G. Then, as shown in FIG. 3, a pipe is connected to the air supply port 24 provided in the middle of the hole 21. It should be noted that it is sufficient to provide the gap detection unit 20 on the spacer member 8 at one of the four locations.

The air supply system shown in FIG. 3 is illustrated as for a four roll stand. Each roll stand N
o. 1-No. The air supply ports 24 of 4 are pipes 31
And to the pneumatic system 33 via a flexible tube 32. The pneumatic system 33 is connected to a pipe 36 via an air source 34 and an opening / closing valve 35 of a factory, for example. Each of the air supply systems 30 connected in parallel has a pressure gauge 37, a pressure switch 38, and a flow rate adjusting valve 39.

This embodiment is constructed as described above, and each roll stand No. 1-No. 4 presses the movable bearing box 5 by the hydraulic cylinder 7 during casting, and the tip of the spacer member 8 is pressed against the contact plate 9 of the reference side bearing box 3. At this time, in each of the gap detection units 20, the tip of the spacer member 8 comes into close contact with the contact plate 9, and at the same time, the air port 2
Since 2 is closed by the caul plate 9 and the sealing material 23, a predetermined air pressure (static pressure) is established inside each air supply system 30. The static air pressure is displayed by the pressure gauge 37. The pressure switch 38 is switched to the set air pressure side and holds the set hydraulic pressure for the hydraulic cylinder 7. Therefore, the roll gap G based on the surface position of the contact plate 9 is held at the set value. This keeps the casting center on the predetermined casting line.

On the other hand, when an abnormal state occurs in which the anti-reference side roll 4 of one of the roll stands retracts due to the force from the slab 10 during casting, a gap is created between the backing plate 9 and the spacer member 8. . When the gap g expands beyond the predetermined crush amount a of the sealing material 23 as shown in the enlarged view of the A portion of FIG. 1, the air flowing through the air supply system 30 leaks from the gap and the air pressure sharply increases. As a result, the pressure gauge 37 becomes zero. Therefore, when the pressure switch 38 becomes equal to or lower than the set air pressure, the pressure switch 38 switches to the opposite side, and its command signal is sent to the control valve (not shown) of the hydraulic system of the hydraulic cylinder 7.
The hydraulic cylinder 7 is pressed against the force of the slab 10, and the roll 4 on the opposite side of the reference side is pressed so as to eliminate the gap g.
Push back.

Therefore, the air supply system 3 provided with the gap detection unit 20.
By detecting the air pressure standing at 0 with the pressure switch 38, it is possible to automatically monitor whether or not the predetermined roll gap G is achieved, and the roll gap G is automatically adjusted with good responsiveness. Can be held at. Further, a heat shield against the radiant heat of the cast slab is as simple as a heat shield plate and only needs to shield the spacer 8 and the gap detecting portion 20. No waterproof measure against the secondary cooling water for cooling the cast slab is required. . Therefore, the present system can detect the variable gap between the two members by detecting the air pressure standing in the air supply system 30, and therefore has high reliability and is capable of operating under the adverse environment as described above. Moreover, it can be effectively used for a long time even in a narrow place.

In the above embodiment, the gap detecting section 20 is provided on the spacer member 8 side, but the gap detecting section may be provided on the contact plate 9 side.

[0018]

As described above, according to the present invention, the air pressure standing in the air supply system provided with the gap detecting portion is detected, and if the air pressure is reduced due to the leakage of air from the gap, the air pressure between the two members is reduced. Since it is possible to detect that the gap is equal to or larger than the set value, there is an effect that the structure is simple and inexpensive, and high reliability can be maintained for a long time.

[Brief description of drawings]

FIG. 1 is a front view showing a partially enlarged cross section of a roll stand according to an embodiment of the present invention.

FIG. 2 is a plan view of the roll stand.

FIG. 3 is an air supply piping diagram of the present system.

FIG. 4 is a plan view of a conventional roll stand.

FIG. 5 is a front view of FIG.

[Explanation of symbols]

 1 Reference Side Roll 2 Roll Stand 3 Reference Side Bearing Box 4 Anti-Reference Side Roll 5 Movable Bearing Box 6 Press Frame 7 Hydraulic Cylinder 8 Spacer Member 9 Contact Plate 10 Cast Piece 20 Gap Detecting Section 21 Hole 22 Air Port 23 Sealing Material 30 Supply Air system

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takashi Kubo, 1-2 Marunouchi, Chiyoda-ku, Tokyo Japan Steel Pipe Co., Ltd. (72) Masayuki Mukaiyama, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Date Inside the Steel Pipe Co., Ltd. (72) Inventor Hiroshi Kawaguchi 2-3-1 Arai-cho, Niihama, Takasago-shi, Hyogo Inside Takasago Works, Kobe Steel Co., Ltd. Kobe Steel Co., Ltd. Takasago Works

Claims (1)

[Claims] 1. A device for detecting a variable gap between two members, wherein a gap detection section is provided with an air port and a sealing material surrounding the air port at the tip of one of the opposing members, and the air port. A gap detection device comprising a connected air supply system and detecting that the gap becomes equal to or larger than a set value by detecting a decrease in air pressure when air leaks from the gap detection unit. Air system.