JPH0344361Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention is based on a twin roll continuous casting equipment.
The present invention relates to a measuring device that can accurately measure the distance between rolls during casting.

[Conventional technology]

Pouring molten metal such as molten steel onto the surface of the cooling roll,
There is a twin roll type continuous casting machine as a machine that rapidly cools this and continuously casts a thin plate. This device, as described in Japanese Patent Publication No. 60-17625, for example, is composed of a fixed side cooling roll and a free side cooling roll held at a predetermined distance from the fixed side cooling roll. The free side cooling roll is arranged so that the roll spacing can be adjusted. In order to set the solidification position of the poured molten metal at an appropriate position, the distance between the rolls is detected, and the rolling force of the free side cooling roll is controlled so that the distance between the rolls becomes a predetermined value.

The roll gap in such a thin plate manufacturing apparatus has generally been indirectly measured by measuring the distance between roll chocks using a roll gap sensor such as a differential transformer type.

[Problem that the invention attempts to solve]

However, with this type of measuring device, it is impossible to directly measure the distance between rolls in the long part of the roll body.
In particular, there was a problem in that it was not possible to measure changes in the distance between rolls during casting, where thermal deformation of roll jocks, rolls, etc. is a problem. In other words, the distance between rolls changes due to factors such as thermal expansion of the rolls themselves, play in the bearings, thermal deformation of the roll jocks, and positioning accuracy of the free roll jocks, but this cannot be addressed by simply measuring the distance between the roll jocks as in the past. I couldn't do it. Regarding thermal deformation, when the thickness of the slab becomes 2 mm or less, the effect of the heat crown of the rolls cannot be ignored, and the effect of this thermal deformation becomes larger as the thickness of the slab becomes thinner. There was a problem that the quality of the product deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a roll spacing measuring device that can overcome the drawbacks of the conventional devices and directly measure the roll spacing and its changes during casting.

[Means for solving problems]

In order to achieve this purpose, the measuring device of the present invention is designed to measure the distance between the rolls of twin-roll type continuous casting equipment, which continuously casts thin plates by pouring molten metal between a pair of cooling rolls that rotate in opposite directions. In the measuring device, a first gap sensor for detecting the heat crown amount of the roll is disposed close to the body surface of the roll, and a first gap sensor that detects the heat crown amount of the roll is disposed close to the body surface of the roll. A second gap sensor is disposed opposite each of the rollers to detect the amount of movement of the surface of the roll shaft in the direction along the line.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a plan view of a roll distance measuring device according to the present invention, and FIG. 2 shows a side view of the same.

In the figure, 1 is a fixed roll, 2a and 2b are fixed roll chocks that are fixed to a fixed member and rotatably hold both ends of the fixed roll 1, and 3
4a and 4b are free side rolls, and 4a and 4b are rotatable ends of the free side roll 3, respectively, and fixed side rolls 1.
and a free side roll chock 5 that adjustably maintains the distance between the free side roll 3, that is, the roll spacing;
Hydraulic cylinders a and 5b independently drive the free side roll chocks 4a and 4b to vary the roll interval.

The fixed roll 1 and the free roll 3 are horizontal rolls made of copper, copper alloy, or steel, and each has a built-in water cooling mechanism (not shown). It is arranged so that it is driven via a joint device 7 and rotated at a predetermined speed in the direction of the arrow.

In the present invention, as the first gap sensor for measuring the heat crown of the fixed roll 1, a plurality of sensors, for example three, are installed close to the body surface of the fixed roll 1 at predetermined intervals in the axial direction. Gap sensors 8a, 8b, and 8c are provided. These gap sensors 8a to 8c are installed at a position approximately perpendicular to the direction of pressure contact between the fixed roll 1 and the free roll 3, for example, directly below the fixed roll 1, so as not to detect the lateral movement of the shaft of the fixed roll 1 itself. At the side, it is attached to a fixing member via a fixture 9. Since the gap sensors 8a to 8c detect and output the roll spacing at each point, the roll crown profile is measured by calculating the roll spacing. Therefore rolls 1, 3
A grinding device (not shown) is provided in pressure contact with the roller, and by controlling this according to the outputs of the gap sensors 8a to 8c, the roll crown profile can be formed into a predetermined shape.

In addition, as a second gap sensor for detecting rigid body deviation due to excessive roll reaction force of the rolls 1 and 3 themselves, the fixed roll 1 is and the shaft end 3 of the free side roll 3.
A is provided with gap sensors 8d and 8e, respectively, and a fixture 9 is provided in the same manner as the gap sensors 8a to 8c.
is attached to the fixed member by. In addition, fixing tool 9
are made of a material with a small coefficient of thermal expansion such as ceramic, and gap sensors 8d and 8 are formed due to temperature changes.
The distance between e is kept unchanged.

The outputs of the gap sensors 8d and 8e are supplied to the hydraulic cylinders 5a and 5b, respectively, so that the hydraulic cylinders 5a and 5b are independently controlled and the roll interval is set to a predetermined value.

The above-mentioned gap sensors 8a to 8e may be of an optical type, an air type, a magnetic field type, etc.; Use a capacitive type.

In the capacitance type gap sensors 8a to 8e, there is a gap between the gap sensors 8a to 8c and the roll 1, or between the gap sensors 8d and 8e and the shaft end 1.
The roll 1 and gap sensor 8 are connected by detecting the capacitance of the capacitor formed between a and 3a.
Distance from a to 8c and gap sensors 8d and 8e
The distance between the shaft end portions 1a and 3a is detected. In other words, the capacitance C of a capacitor is expressed by the equation (1), where ε is the dielectric constant, S is the area, and d is the distance. Therefore, if the capacitance C of the capacitor can be measured, Dielectric constant ε of casting atmosphere and opposing area S
Since d is known, the distance d can be found.

In addition, capacitance type gap sensors 8a to 8e
has excellent temperature drift characteristics, and its temperature characteristics are approximately ±0.01%/°C.

Next, a procedure for determining the distance between the rolls 1 and 3 from the detection outputs of the gap sensors 8a to 8e will be explained.

Now, a _p and a _i are the distance between the roll shaft end 1a detected by the gap sensor 8d and the gap sensor 8d, b _p and b _i are the distance between the roll shaft end 3a and the gap sensor 8e detected by the gap sensor 8e, and c _p and c _i are the distances between the body surface of the roll 1 detected by the gap sensors 8a to 8c and each gap sensor 8a to 8c, and _d1 is the roll shaft end 1a,
3a, d ₂ is the radius of rolls 1 and 3, e is the distance between gap sensors 8d and 8e, X _p is the initial correction value, and the roll spacing is δ _p and δ _i , then this roll spacing δ _i is as shown above. It can be calculated using the following equation based on the detected values of the gap sensors 8a to 8e.
Note that the subscript 0 means the reference value, and i means the value at the time of casting.

2d ₂ +δ _p =2d ₁ +a _p +e+b _p ...Equation (2) Therefore, δ _p =2d ₁ −2d ₂ +a _p +e+b _p ...Equation (3) On the other hand, δ _i =a _i +b _i +2c _i −X _p ...Formula (4) Therefore, δ _p =a _p +b _p +2c _p -X _p ...Formula (5) Here, if we set equation (3) = equation (5), then 2d ₁ -2d ₂ +a _p +e+b _p = a _p +b _p +2c _p −X _p
...Equation (6) ∴Xo=2c _p -2d ₁ +2d ₂ -e In other words, in the present invention, the heat crown of the roll 1 is measured by the first gap sensors 8a to 8c, and the heat crown of the roll 1 is measured by the second gap sensors 8d and 8e. , 3 itself, it is possible to measure the roll spacing even during casting. In other words, when the roll interval is larger than the standard value, the roll pressure is increased, and when the roll interval is small, the roll pressure is lowered.
Even during casting, even if the roll spacing tends to change due to the various factors mentioned above, the roll spacing can be maintained at a standard value.

Further, if the hydraulic cylinders 5a, 5 are feedback-controlled based on the detected roll interval, correction between the roll chocks 2, 4 can be effected.

Further, by separately providing a roll online grinding device (not shown) and controlling this according to the outputs of the gap sensors 8a to 8c, it is also possible to correct the roll crown.

[Effect of idea]

As described above, according to the present invention, it has become possible to directly measure the distance between rolls during casting, which was impossible with conventional measuring devices. When the roll spacing is controlled online based on this measurement result, the roll spacing can be maintained at a standard value even if the roll spacing tends to change due to various factors during casting.

In particular, the present invention has a configuration in which a second gap sensor is disposed on a line connecting the centers of the roll shafts, facing each roll shaft surface, and detecting the amount of movement of the roll shaft surfaces in the direction of the line. Therefore, there are no error factors such as bearing play, thermal deformation of the roll chock, play of the hydraulic cylinder mounting part, etc. that occur with conventional techniques that indirectly measure the distance between roll jocks, and the roll distance can be measured accurately. .

Since the distance between the rolls is maintained within a certain range in this manner, the quality of the product obtained by twin-roll continuous casting, such as shape and surface texture, is excellent.

[Brief explanation of drawings]

FIG. 1 shows a plan view of a roll distance measuring device according to the present invention, and FIG. 2 shows a side view of the same. 1: Fixed side roll, 2: Fixed side roll chock, 3: Free side roll, 4a, 4b: Free side roll chock, 5a, 5b: Hydraulic cylinder, 6a:
motor, 6b: gear, 6: drive device, 7: joint device, 8a to 8c: first gap sensor,
8d, 8e: second gap sensor, 9: fixture.

Claims (1)

[Scope of utility model registration request] In a roll spacing measuring device for twin-roll continuous casting equipment that pours molten metal between a pair of cooling rolls that rotate in opposite directions to continuously cast a thin plate, a first device that detects the amount of heat crown of the rolls is used. A gap sensor is disposed close to the body surface of the roll, and on a line connecting the roll shaft centers of the two rolls, facing each of the roll shaft surfaces, the gap sensor is arranged in the direction above the line on the roll shaft surface. 1. A roll gap measuring device for twin roll continuous casting equipment, characterized in that a second gap sensor is provided for detecting the amount of movement of the rolls.