FR2496506A1 - DEVICE FOR MEASURING THE ROLL OF ROLLING CYLINDERS - Google Patents

Abstract

THE INVENTION CONCERNS A DEVICE FOR MEASURING THE TAKE-UP OF ROLLING CYLINDERS. IN THE UPPER OR LOWER SLOTS 4 OF THE TWO COLUMNS OF A LAMINATOR CAGE, MEASUREMENT VALUE SENSORS 28A ARE INCORPORATED, THE ZERO POSITION OF WHICH IS MECHANICALLY ADJUSTED TO A MEASURING SURFACE TO ADAPT IT TO EACH THEORETICAL DISTRIBUTION OF THE ROLLER SUPPORTING STOCKS. THE DEVICE OF THE INVENTION IS USED TO DETERMINE THE ADJUSTMENT AMOUNT OF THE TAKE-OFF OF THE ROLLER CYLINDERS BY DETERMINING THE PITCH DISTANCE OF THE CAGE OF A ROLLER.

Description

The present invention relates to a device

  measurement for a rolling mill cage in order to determine

  the adjustment quantity for setting the roll gap, by determining the spacing of the chocks in the roll stand, in particular the spacing

  chocks of the support rolls of a roll cage

  quarto black, measurement value sensors being incorporated in the upper or lower chocks of the two columns of the rolling mill stand, the zero position of these sensors being mechanically adjusted with respect to

  measuring surface to adapt it to each

  Theoretically, the chocks of the support cylinders

  When rolling strips, it is practically

  common to perform a tape thickness adjustment to achieve close tolerances for that thickness. In this case, besides the solution that must be made to the dynamic problem posed by such an adjustment, it is also necessary to resort to a sufficiently rapid adjustment system and to determine

  the adjustment variable with the least possible delay.

  Known solutions for measuring the right-of-way

  rolling mill rolls, the measurement made in the in-

  induction measuring gages with

  direct intervention on the cylinders (patent of the Federal Republic of Germany DE-PS 1,931,654) seems,

  at first glance, be advantageous. Nevertheless, in

  currrent, we encounter great difficulties when

  is to adapt such measuring devices to cylinders

  ders. Measuring devices must be fully

  disassembled with each change of cylinder.

  In order to avoid these disadvantages, another

  measuring device (patent application of the Republic of

  Germany DE-OS 2,439,580) measures the distance from one chock to another, the spacing of the chocks of the support rolls of a quarto cage being taken as adjusting variable for the position of the 'grip of cylinders. However, this known device V can be adopted in the practical field only for a narrow measuring range of up to a maximum of 3, up to a value corresponding to 2 × 5 times the total measurement interval of the measuring apparatus. displacements. As a result, the possibilities of application are limited, since

  measurement of the inductive sensor must be reduced to reach

  the high resolution of the signal. If the device

  known measure was especially designed for a large part of

  course of measurement, we would get a bad signal

  if one simply had to determine a

  change in the spacing of chocks

  ders. Moreover, we must consider as a characteristic

  particularly disadvantageous, that the zero point of the measuring sensor must be sought by a special command, this operation taking place in

  In addition, when a lifting device

  in which the lifting piston is maintained in

  floating position, while locking systems

  hydraulics act by means of

  pressure relief, check valves, etc. The

  mounting dimensions of such a system are important.

  The object of the present invention is to provide a measuring device with automatic zero point adjustment, this device comprising an inductive measuring sensor having a very small measurement path (for example: 1 nuIn and less), the total measurement interval

  of the distance measuring system, however,

  undermine up to 100 times the measurement interval of the system

  measurement of displacement while, in addition, the

  positive measurement is installed without disturbance in

  the rolling mill cage so that, in the event of

  abrupt tent of the rolling mill cage and the force of

  reminder that the latter then undergoes

  swarm thus engendered can not especially act on the

measuring sensor.

  According to the invention, this object is made possible by the following features: this device (the measurement consists of a housing receiving an adjusting nut that can be screwed onto the face remote from the measuring surface of the opposite chock; has gorges shot in

  the protruding mass, one of these protruding projections

  an abutment surface for a sleeve that can move axially, while the other projection makes

  counter-surface for a spring coming in

  fold on a collar of the socket; the adjustment nut and the sleeve comprise passages for a movable measuring sensor support, this support being displaceable, by means of a piston which can be loaded, in a chamber delimited by

  the adjusting nut, this chamber comprising

  supply and discharge lines for a pressure medium for moving the bushing and the piston; at its free end, the support surrounds the measuring sensor with a measuring tip that can be moved against the pressure of a spring; and

  a clamping element installed between the

  measuring sensor port and socket fixed this last

this support.

  In this way, there is a compact unit whose reduced-size housing encloses all the displacement organs, as well as the retaining device or

  clamping clamp for measuring sensor support.

  The measuring path of the sensor (which can be adjusted to meet the fine thread adjusting nuts, preferably outside the roll stand, while a readjustment can be made in the roll stand ) is so low that high measurement sensitivity and high signal resolution

  are ensured with a low noise level for the ampli-

  fier. In this case, the measurement path equi-

  vWlt, on the mechanical side of the housing having been twisted against the control screens and it can

  be perceived by the distance separating the nuts

  When it is pressed, it is pressed against the abutment surfaces of these nuts. Both the miiechanical measurement path and the electrical measurement path are identical. Subsequently, the set course (for example, -1 mun) is no longer modified and must be maintained even if the total interval of

  measure to compensate for the rectification of the cylinders

  tet working tools for the treatment of extremely

  mehere thick reaches, for example, 50 mm. The large measuring range is determined by the measuring sensor support, which can be moved by the pistons, while it can be clamped on the surface

  miesu.e after the introduction of the measuring tip.

  Theoretically, according to the example indicated, a material with an initial thickness of 50 mm could be rolled up to 1 iaiii without the measurement accuracy being influenced. The positioning of the measuring sensor is performed when the rolling stand is prestressed, ie when the rolling stock

  is already in the grip of the cylinders.

  According to a feature of the invention,

  ] The calibration is carried out in the form of a blow-

  air flap can be pneumatically solicited and comipoirtazit a rapid ventilation system. According to another characteristic of the invention, the measuring force of the sensor is in the range

  from 150 to 200 g, while the clamping force

  The interference of the clamping element on the measuring sensor support represents 5 to 7 times the measuring force. In this way, in addition to the system already known and protects that the measuring device is installed in the chocks of the support cylinders or u; vetuel] t: ment working cylinders near {einpis [o it n ' There is no attack by aggressive refrigerants or solicitation

  in the presence of cracking of the strips under

  mechanical fluences, in the presence of an excessive rolling force, the measuring sensor which is pneumatically clamped by its support during

  the measuring operation, does not undergo any deterioration.

  The clamping force is calculated so that

  beyond 5 to 7 times the measuring force, the sensor support is moved automatically and

  therefore, already in the presence of a pressure of appli-

  1,000 to 1,500 gil avoid external forces.

  therefore giving rise to an automatic opening

  hydraulic adjustment cylinder.

  An embodiment of the invention will be described below in more detail with reference to the accompanying drawings in which: FIG. 1 is a diagrammatic front view of a column of a quarto rolling mill cage comprising the measuring device according to the invention; FIG. 2 is a sectional view illustrating

  details of a measuring device according to the invention

  installed in a rolling mill chock, this cut

  being taken along the line I-I of Figure 1.

  FIG. 1 schematically illustrates a column 1 of a quarto roll stand not shown

  in more detail, The two columns of the

  black have windows 3. In these windows 3

  and more precisely in the chocks 4, 4a, are

  of the upper and lower support rollers 5, while the working rolls 7 are installed

in the chocks 6, 6a.

  On each side of the columns, in the chocks

  4 of the support cylinders, it is possible to incorporate two

  Measuring devices 8 mounted in summation so that it can measure the tilting movements of the chocks inside the column. In addition, by means of this measuring device 8, changes in distance or distance inside the rolling system are determined under the influence of

force modifications.

  As shown in FIG. 2, the measuring device 8 is installed in a hole It is practiced in

  the upper chock 4 of the support cylinders. The provision

  measuring device 8 consists of the housing 12 which, at its upper end remote from the measuring surface M, comprises a thread for a fine thread adjusting nut

  13. The housing 12 also comprises turn grooves

  formed in the mass and which, due to their different diameters, form projections 14, 15. The upper projection 14 acts as abutment surface A for a sleeve 16 which can move axially in the

  housing 12, while the lower projection 15 cons-

  a bearing surface for a spring 17 which bears on a flange 16a of the bushing 16. At the lower end of the housing 12, the bushing 16 is

  screwed to an end piece 21 by means of bolts 18.

  The adjusting nut 13, as well as the bushing 16 and the end piece 21 comprise passages 22 intended to receive the mobile support 23 of the measurement sensor, a piston 24 being able to be biased in a chamber 25 delimited by the adjusting nut 13 , in order to move this support 23. The pressure medium is conveyed or

  evacuated via lines 26 and 27.

  The support 23 of the measuring sensor comprises the measuring tip 28 emerging from the housing 12 and able to make a return movement on a path

  determined W against the pressure of a spring.

  As shown diagrammatically in FIG. 2, the measuring tip 28 is connected, via a rod 29, to the iron core 30 of the inductive measurement sensor generally designated by the reference numeral 28a. The position of the iron core 30 can be modified with respect to the coils 34. For the electrical connection, cables 33 are placed above the measuring device 8 in the space of the hole 1I1 which is not occupied by the housing 12 Below the chamber 25, between the bushing 16 and the measuring transducer 23, there is provided a clamping element 31 in the form of an air bellows that can be pneumatically urged. This pneumatic clamping system for the support 23 of the measuring sensor is not subject to wear and is relaxed in a few milliseconds by a rapid ventilation system 32. The clamping process takes place without the intervention of moving parts. and it exerts a static pressure on the support of the measuring sensor. The application force is calculated

  in such a way that taking into account the

  between the support 23 of the measuring sensor and the

  clamping force 31, the maximum holding force does not

  does not pass a value corresponding to 7 times the measuring force of the sensor 28a. All centering surfaces

  or buttct, as well as the housing are soaked, recessed

  calculated and calculated for long durations corresponding

  high frequency of commissioning.

  The measuring device functions from the

  Next: The measuring path of the device 8 is fixed outside the rolling stand by rotating

  the fine thread adjusting nut 13 against the housing 12.

  The mechanical path, which is identical to the electrical measuring path, is determined by the distance

  between the tightened adjustment nut 13 and the bushing 16 when

  that this is applied to the abutment surface A (FIG. 2). The adjustment nut 13 is rotated by means of the adjusting rod 35. When the measuring device b is installed in the chock 4 of the cylinders

  support 23, the support 23 is subjected to a pressure

  the intervention of the piston 24. For this purpose, the

  Pressure medium is routed through line 26.

  In this way, the sleeve 16 which is also subjected to

  sion and which is in the form of a pneumatic cylinder

  a simple effect, is at the same time moved against the surface of the upper projection 14.

  pist. the support 23 of the measuring sensor is

  cited until it comes to place st, with its tip cie 28, on the measuring surface M opposite for distance measurement. As the bias increases, the measuring pin 28 under the pressure of a spring is moved along the path W until

  abutment against the annular surface 23a of the support 23.

  In this state, the clamping member 31 is brought under

  pressure via lines 32, 32a, so that the

  port 23 of the sensor is tight and forms a

  -unit with the sleeve 16, After tightening, the pressure

  sion is relaxed in the chamber 25 or the part 25a

  of which is located above the surface of the

  As soon as the pressure expands, when the spring 17 is actuated, the support 23 of the measuring sensor automatically moves.

  recall a few milliseconds. Under the request

  spring, the bushing 16 is placed against

  the screwed adjustment nut 13, as shown in FIG.

  16 'in Figure 2. In this way, a

  electrical zero inductive sensor 28a stef-

  is automatically calr, with the return movement of the sleeve 16 against the adjusting nut 15 under the pressure of a spring, the measuring tip 28 moves away from the support 23 against the annular surface 23a which it was pressed during positioning, so that the measuring sensor 28a is brought into the measuring position in which the iron core 30 arrives at a zero position in which the currents no longer pass through the coils 3-1 with zero indication

  at the output of a measuring device (not shown).

  The measuring tip 28, whose adjustment path W should, moreover, always be greater than the measuring path set for the measuring device *, is further biased by a spring to make contact with the measurement surface M of the opposite chock 4, so that the device (the measurement 8 is ready to be put into operation to carry out a measurement or to maintain the constant distance.) This measurement position which, in addition, is further characterized by the position (indi dotted line 16t) of the measuring sleeve 16, is represented in FIG. 2, the drawing not representing the measurement point 28 biased against the annular surface 23a.The deflection signal obtained during the measurement process and caused by changes of course resulting from differences in the bands, as well as changes in rolling, is conveyed within an electronic system, to a cylinder adjustment system (not repressed). sented in detail) where it is treated as long as this system maintains

  the gauge measured at a constant value. To ream-

  the support 23 of the measuring sensor in its starting position, after evacuation of the air out of the element

  clamping device 31, the chamber 25 is urged via the

  pick 27 and the support 23 of the measuring sensor is

recalled by the piston 24.

  Since the support 23 of the sensor of

  measurement is automatically recalled, under the

  With a spring and with the inductive measuring sensor 28a, against a fixed, wear-free surface, the zero area of the measuring sensor can be found constantly with a very high accuracy within the tolerance of 1 δ. No complicated and inconvenient device is needed to achieve this accuracy. Since the measuring system is only associated with very small masses (the moving parts involved in the measurement weigh about 15 g), the measuring system is designed

for strong accelerations.

Claims (3)

  1. Measuring device for a rolling mill stand to determine the adjustment quantity   for adjusting the cylinder grip, in particular   the spacing of the chocks from the roll stand, in particular the spacing of the chocks from the support rolls of a quarto mill stand,   measurement values being incorporated into the upper chocks   lower or lower of the two columns of the roll stand, the zero position of these sensors being mechanically adjusted with respect to a measuring surface to adapt it to each theoretical spacing of the chocks   bearing cylinders, this measuring device   the following features: this measuring device (8) consists of a housing (12) receiving a setting nut (13) which can be screwed onto the face remote from the measuring surface (M) of the opposite chock ( 4a); the housing (12) has grooves in the projection forming projections (14, 15), one (14) of said projections forming an abutment surface (A) for an axially displaceable bush (16), while another projection (15) serves as a counter-surface for a spring (17) coming to rest on a collar (16a) of the sleeve (16); the adjusting nut (13) and the bushing (16) have passages (22) for a measuring sensor movable support (23), which can be   moved by means of a piston (24) which can be   cited, in a chamber (25) delimited by the nut of   setting (13), this chamber (25) comprising   supply and discharge pipes (26, 27) for a pressure medium for moving the bushing (16) and the piston (24); at its free end, the support (23) surrounds the measuring sensor (28a) with a measuring tip (28) displaceable against the pressure of a spring; and until the tightening member (31) installed between the support (23) of the measuring sensor and the socket (16)   fix this last to this support (23).   2. Measuring device according to claim 1, characterized in that the clamping element (31) is made under fo-nle of an air bellows that can be pneumatically solicited and comprising a system rapid ventilation (32).   3. Measuring device according to any one   conque of claims 1 and 2, characterized in that   the measuring force of the sensor (28a) lies in the   range from 150 to 200 g, while the clamping force applied to the interference of the clamping element (31) on the support (23) of the   measurement repeats 5 to 7 times the measuring force.