KR100391569B1 - Measuring method of roll gap using non-contacting sensor - Google Patents

Abstract

PURPOSE: A roll gap measuring method by using a noncontact sensor is provided to measure the roll gap of the noncontact sensor through trigonometry of geometry by detecting the distance between the point of the roll surface and the intersection of the noncontact sensors with using two noncontact sensors. CONSTITUTION: Two noncontact sensors(S,S1) are installed in the upper parts of rolls(10a,10b) and inclined to radiate cross signals. The noncontact sensors calculate a distance(L) between a point(N) of the roll surface and the intersection of noncontact sensors, and output a distance(d) between the surface point of the roll and the intersection. The noncontact sensors calculate a distance(L1) between a point(N1) of the roll surface and the intersection in moving one roll from thermal expansion, and output a distance(d1) between the surface point and the intersection. The roll gap is calculated by subtracting the distance before moving the roll from the distance after deforming the clearance.

Description

Roll gap measurement method using non-contact sensor {MEASURING METHOD OF ROLL GAP USING NON-CONTACTING SENSOR}

The present invention relates to a measuring method using a non-contact sensor in order to measure the roll gap in the twin-roll type sheet manufacturing apparatus for casting a thin plate directly from the molten metal, in particular after detecting the shortest distance from the non-contact sensor to the roll surface It relates to a method for indirectly measuring the absolute distance of a roll gap using an angle.

In general, the thin plate casting injects the molten metal 20 into the upper portion of the twin roll 10, as shown in Figure 1, this molten metal 20 is cast into a thin plate 30 by the rotation of the twin roll (10) It is wound up by 40 to become a coil 50.

However, the pair roll 10 is composed of a fixed roll (10a) and a moving roll (10b).

In the sheet casting method as described above, the roll gap G was measured using a contact sensor 70 mounted between the roll chocks 60 as shown in FIG. 2.

The above-mentioned roll gap G is the minimum distance between the fixed roll 10a and the moving roll 10b and means the distance of the roll nip.

Therefore, to be precise, it means a gap between the fixed roll 10a and the roll choke 60 on which the moving roll 10b is installed. The reason for measuring the gap of the roll choke 60 as described above is that the contact type sensor 70 cannot measure the thickness of the hot plate at the time of casting.

However, because there is a gap between the roll chocks 60 and the roll due to the bearing gap, the gap of the roll choke 60 and the roll gap G cannot be the same, and the molten steel is fixed roll 10a and the moving roll ( Injection between 10b) causes the roll to expand as the temperature rises and thus the actual roll gap G decreases.

However, in the conventional method using the contact sensor 70, since only the roll choke gap is measured, there is no method of measuring such a change in the roll gap G.

The present invention has been made in view of the conventional problems as described above, the object is to use two non-contact sensors in the upper end of the roll when the molten steel is injected between the two rolls and the roll expands as the temperature rises It is to provide a roll gap measuring method using a non-contact sensor that can measure the actual roll gap using the geometry while detecting any point on the surface of the roll.

A feature of the present invention having the above object is to detect the distance between a random point on the roll surface and the non-contact sensor using a non-contact sensor at the top of the roll in a twin-roll thin sheet casting apparatus, and then use a triangulation method of geometry. By measuring the roll gap.

1 is a schematic view of a general sheet casting apparatus,

Figure 2 is a side configuration diagram showing a conventional roll gap measurement state,

3 is a side configuration diagram showing a roll gap measurement state by the method of the present invention.

<Description of Symbols for Major Parts of Drawings>

10: twin roll 10a: fixed roll

10b: moving roll 20: molten metal

30: thin plate 40: winder

50: coil 60: roll choke

70 contact sensor G roll gap

S, S ₁ : Non-contact sensor L, L ₁ : Distance

d, d ₁ : Distance N, N ₁ : Roll surface point

C: intersection

3 is a side configuration diagram showing a roll gap measurement state according to the method of the present invention, in which two non-contact sensors S (S ₁ ) are installed to cross each other while having a predetermined inclination angle on the pair of pair rolls 10. It is.

Irradiate each non-contact sensor (S) (S ₁ ) to any point of the pair of rolls 10 to obtain a surface point (N), whereby the intersection point (C) of the non-contact sensor (S) (S ₁ ) The distance L is calculated, and the distance d value between the surface point N and the intersection point C thus calculated is calculated by calculating d = L sinθ.

Subsequently, when any one of the pair of rolls 10 is in positional deformation due to thermal expansion and movement, each non-contact sensor S (S ₁ ) is the surface point (N ₁ ) of each of the rolled position and the non-contact sensor ( The distance L ₁ between the intersection point C of S) (S ₁ ) is calculated, and the value of the distance d ₁ between the surface point N ₁ and the intersection point C calculated thereby is d ₁ = L _It is calculated by ₁ sinθ.

The roll gap G is calculated by subtracting the distance value d calculated before the position deformation of the twin roll 10 from the distance value d ₁ calculated after the position deformation of the double roll ₁₀ , that is, d ₁ -d. Measure

Referring to the present invention measured in this way in more detail as follows.

The present invention first installs each non-contact sensor (S) (S ₁ ) to be inclined at the desired angle to the upper portion of the pair of rolls (10) installed for casting the thin plate, the pair of rolls in the non-contact sensor (S) (S ₁ ) The distance L between the surface point N and the intersection point C of each of the non-contact sensors S and S ₁ is calculated from the signal irradiated to any point of (10), and the surface point calculated thereby. Calculate the distance d value between (N) and the intersection point (C) by the following equation ①.

d = L sinθ-----------①

Then, when any one of the pair of rolls 10 is subjected to positional deformation due to thermal expansion and movement, the surface point N ₁ of each of the rolls deformed by each of the non-contact sensors S and S ₁ and each of the non-contact sensors The distance (L ₁ ) between the intersection point (C) of (S) (S ₁ ) is calculated, and the value of the distance (d ₁ ) between the surface point (N ₁ ) and the intersection point (C) calculated thereby is expressed by the following equation ② Calculate

d1 = L ₁ sinθ-------------②

As described above, the value (d) and (d ₁ ) calculated by the equations ( ₁ ) and ( ₂ ) are calculated by the following equation (3) to measure the roll gap (G).

d_One -d---------------③

The roll gap measuring method using the non-contact sensor of the present invention as described above uses two non-contact sensors provided by isolating the roll gap generated when the roll expands as the temperature rises when molten steel is injected between the two rolls. By measuring the roll gap in a geometric manner while sensing any point on the roll surface, it is possible to prevent deterioration of the sensor due to the high temperature of the casting roll, thereby extending the service life of the sensor and improving the measurement degree.

Claims (1)

Each non-contact sensor (S) (S ₁ ) for irradiating a signal to cross each other while having a predetermined inclination angle at the top of the pair of rolls (10), the roll surface by using the non-contact sensor (S) (S ₁ ) The distance (L) between the point (N) and the intersection point (C) of the non-contact sensor (S) (S ₁ ) is calculated, and the distance (d) value between the surface point (N) and the intersection point (C) calculated thereby. Calculating d = L sin θ; Surface point (N ₁ ) of the roll in which each non-contact sensor (S) (S ₁ ) is position-deformed so as to measure the gap when any one of the pair of rolls (10) is a position deformation occurs by thermal expansion and movement Calculates the distance (L ₁ ) between the contact point (C) and the intersection point (C) of the non-contact sensor (S) (S ₁ ) and calculates the distance (d ₁ ) between the surface point (N ₁ ) and the intersection point (C) calculated therefrom. Calculating ₁ = L ₁ sin θ; The value d before the gap deformation of the double roll 10 is measured by calculating the roll gap G from the equation d ₁ -d from the value d ₁ calculated after the gap deformation of the double roll 10. Roll gap measurement method using a non-contact sensor.