FR2691535A1 - Measuring device for determining the distance of the bearing cylinder mounting members of a quarto rolling mill cage. - Google Patents

Abstract

The invention relates to a measuring device for determining the distance of the supporting roll mounting elements of a quarto rolling stand. This device determining the distance (12) of the support roll mounting elements (8, 9) of a quarto rolling stand (1) for adjusting the grip (13), comprises two housings (15) arranged symmetrically in the uprights (2) of the cage and comprising sensors (16) which can be engaged and disengaged for two distance measuring devices (17), the sensor boxes each housing a cylinder and a lifting piston (19, 20 ), on the piston rod (22) of which is fitted a sleeve constituting the sensor (16) in the housing of which are mounted two opposing clamping sleeves. Application in particular to quarto rolling mills.

Description

Measuring device for determining the distance of the mounting elements

  The invention relates to a measuring device for determining the distance of the support roll mounting members of a quarto rolling stand as a control variable for the control of the grip between the rolls, with interchangeable housings mounted in the lower and upper cylinder mounting elements

  of the two uprights of the roll stand, symmetrically

  relative to the plane containing the axes of the cylinders, and provided for measuring sensors and distance measuring devices, and in which the housings of the measuring sensors house double-acting lifting pistons, which are de- placed in the lifting cylinders and which serve to displa 15 the measuring sensors in one direction and the other to bring them to the measuring position and the rest position, and on each lifting piston is arranged a piston rod, which acts as a stop element and whose stroke is limited, when the release of a measuring sensor from its housing, which is housed in a lower or upper element for mounting a cylinder d pressing, to bring it into the measuring position for the distance measuring apparatus, arranged in an upper or lower element for mounting a support roll, by the stop formed by an upper or lower element of mounting a cylinder

  support, and clamping sockets, which allow a movement

  axial cement of the latter during

  the introduction and release of these sensors and which serve

  to hold the measuring sensors in the position of

  sure, are mounted in the housing of the measuring sensors.

  In such a measuring device according to German Patent 24 39 580 C 3, the measuring sensors housed in the lower elements for mounting the support rolls, for

  Distance measuring devices arranged in the

  The upper mounting elements of the support rollers are

  in the form of measuring bolts A double-acting lifting piston, which moves in a lifting cylinder, is mounted parallel to the measuring bolt in the measuring sensor housing and against the lower surface a piston rod is mounted, which is connected to this bolt by means of a drive stirrup to move the measuring bolt to the measuring position and to return it to the rest position, the stroke of the measuring bolt being

  limited, when moving out of the sensor housing

  by a piston rod, which is disposed on the upper surface of the lifting piston and which acts as an abutment member and which bears against an abutment in the element

  upper mounting of a support cylinder.

  The disadvantages of this known measuring device

  should be seen in the mounting space compared

  bearing, which is required by the measuring sensors, and in

high manufacturing costs.

  The object of the invention is to develop a measuring device which is characterized, with respect to the measuring device of the type indicated, by a simplified construction, a

  smaller footprint as well as lower manufacturing costs.

  This problem is solved, according to the invention, thanks to the fact that the measuring sensors are made in the form of cylindrical sleeves which are fitted on the rods of the lifting pistons, are mounted in a sealed manner with respect to the cylinder chamber on the piston rods and can be moved on a defined idle stroke on the piston rods, and for each cylindrical sleeve acting as the sensor of measurement, at least one clamping sleeve is mounted coaxially to the axis of the lifting cylinder in the measuring sensor housing. According to another characteristic of the invention, the device comprises a disc, which is mounted on the end

  free, facing the upper mounting element of a cy-

  bearing lighter, rods of the lifting pistons and which, when a cylindrical sleeve acting as a measuring sensor is disengaged, serves as an abutment element with respect to the upper element of the mounting of a cylinder of support and serves as a drive member for the cylindrical sleeve, when

  the return or engagement of the sensor.

  According to another characteristic of the invention, the cylindrical bushes have, at their end facing the upper element for mounting a bearing cylinder, an annular flange forming a contact element for

  the distance measuring device housed in the upper element

  the mounting cylinder of the support cylinder.

  According to another characteristic of the invention, two mechanical clamping sleeves, which are mounted in

  being turned in opposite directions in the housing of

  measuring heads and which have elastic tabs for

  fixing the measuring sensor in the measuring position.

  The measuring device according to the invention

  presents a simple and advantageous solution to the problem.

  Other features and advantages of the pre-

  invention will emerge from the description given below.

  after, taken in reference to the accompanying drawings, in which Figure 1 is a schematic view of a quarto rolling mill cage comprising the measuring device according to the invention; FIG. 2 is a section on a larger scale, taken along line II-II in FIG. 1, in the case where

  the measuring device, whose measurement sensors are retracted or engaged, is in the rest position; FIG. 3 is a section corresponding to FIG. 2, when the measuring device is in operation;

  is lying. FIG. 1 shows, in a diagrammatic representation, a quarto rolling stand 1 having two diameters

  tents 2, whose windows 3 house upper and lower elements

  lower 4, 5 mounting work rolls, which serve

  wind to support upper and lower work rolls

  6, 7, as well as upper and lower elements 8, 9 for mounting support cylinders, which serve to support

  upper and lower bearing rolls 10, 11.

  The measuring device, with the aid of which the distance 12 between the bearing cylinder mounting elements 8, 9 is determined as the adjustment variable for the regulation of the right-of-way 13, comprises, as constituent elements main, two interchangeable housings 15, which are mounted symmetrically with respect to the plane 14-14 containing the axes of the cylinders, in the lower units 9 for mounting the support cylinders of the two uprights 2 of the quarto rolling mill stand 1, and comprises sensors 16 which can be disengaged and engaged, which extend over the distance 12 between the elements 8, 9 for mounting the cylinders

  of support and are intended for two measuring devices

  17, which are housed in interchangeable

  18, located in the upper elements 8 for mounting the cy-

support linders.

  The housings 15 of the measurement sensors 16 house

  each a lifting cylinder 19 having a piston of the-

  double-acting vane 20, a piston rod 22 being mounted on the face 21 of the lifting piston, turned towards the upper element 8 for mounting the bearing cylinders On the piston rod 22 is fitted with a cylindrical sleeve 23, which acts as a measuring sensor 16 and is sealed against the chamber 24 of the lifting cylinder 19 by a sealing ring 25. The cylindrical sleeve 23 has on its end facing the upper element 8 mounting of the support cylinders, an annular flange 26 forming a contact sensor for the distance measuring apparatus 17 housed in

  the upper element 8 for mounting a support cylinder.

  In the housing 15 of each measurement sensor 16

  are provided, coaxially with the axis 27-27 of the lifting cylinder 19, two mechanical clamping sockets 28, which are di-

  in opposite directions and comprise resilient tabs 29 whose clamping force is dimensioned so that the measuring sensor 7 is formed as the cylindrical sleeve 23 for the distance measuring device 17, is safely maintained in the

  Measuring position 16 'and release and engagement of the sensor out of and into housing 15 is possible. Clamping bushes 28 are preferably made of heavy nonferrous metal.

  The cylindrical housing 30, which receives the bushings

  28 and which is located above the cylinder of the-

  19 of the housings 15 of the measuring sensors 16, is closed by a cover 31, which is sealed by a sealing ring 32 with respect to the housing 15 and by a ring

  sealing member 33 with respect to the cylindrical sleeve 23.

  On the free end, facing the upper element

  8 of mounting of a support cylinder, the rod 22 of the lifting piston 20 of the measuring sensors 16 is fixed a disc 34 which, when the cylindrical sleeve 23 is disengaged

  when the measuring sensor 16 is in the position of measuring

  16 ', serves as an abutment element with respect to the element

  8 of the mounting cylinder and, when the cylindrical sleeve 23 is retracted or engaged when the sensor 16 is in the rest position, serves as an

  for the cylindrical sleeve 23.

  The cylindrical sleeve 23 of the measuring sensors 16 can be moved on the piston rod 22, on a determined idle stroke 35, between the disk 34 at the end of the piston rod 22 and the lifting piston 20. The race maximum 26 of the lifting piston 20 of the measuring sensors 16 is determined by the nominal distance 12 between the elements 8, 9 for mounting the support cylinders in the case of the use of working cylinders 6, 7 and the cylinders d 10, 11 having maximum diameters, plus the depths of penetration 37, 38 of the piston rods 22 in the upper and lower elements 8, 9 for mounting the support cylinders The penetration depths 39, 40 of the cylindrical bushings 23 measuring sensors 16 in the upper and lower elements 8, 9 for mounting the support cylinders are at least equal to the negative measuring range of

  the distance measuring apparatus 17 housed in the upper element

  8 of a support cylinder, and are included,

  preferably between 1 and 2.5 times the full measuring range of the distance measuring apparatus.

  The measuring device operates in the following way: When assembling working cylinders and / or

  bearing cylinders 6, 7; 10, 11 new or revised, the

  working sheets are introduced in parallel and in super-

  position possibly with the support cylinders in the

  roll stand 1, and the elements 8, 9 for mounting the rolls

  support lumbers are locked to the uprights 2 by

  the intermediary of the legs of the latter Wear by abra-

  This is compensated for by the application of possibly revised cylinders against each other. Then the measuring device is started, in which case, once the pistons of

  20 have passed the empty race 35, the bushings

  23 of the four measuring sensors 16 of a roll stand 1 are disengaged in the direction of the arrow a

  outside the housings 15 of the measuring sensors 16, in the position

  16 'of the latter, in which the annular flange 26 of the cylindrical bushes 23 comes into contact with the sensor 41, which is resiliently mounted, of the associated distance measuring device 17 in the upper mounting element 8 of a support cylinder When the measuring sensors 16 are in the measuring position 16 ', the zero position of the distance measuring devices is tared

  17 so that they can work in their range of

  Then, using the measuring device and a cir-

  a regulation setting not described in detail, as well as a hydraulic adjusting device, the footprint 13 is set to a target value by means of a corresponding adjustment of the distance 42 between the axes of the support cylinders as well as the distance 43 between the axes of the working rolls, and this setpoint value of the right-of-way 13 is kept constant during the whole of the rolling operation, by the measuring device, through the control circuit and Adjustment devices During rolling, the dynamic variations of the grip 13, due to variations in the thickness of the strip, are converted into adjustments of the distance 42 between the axes of the support rolls, which lead to again to a distance adjustment 12 controlled by the measuring device between the elements

  8, 9 mounting of the support rollers The measuring apparatus

  distance 17 transmit immediately deviations of the grip 13 from the setpoint value to the control circuit, which again sets the setpoint of the distance 42 between the axes of the support rolls, via of adjustment devices Roller bends are compensated by additional devices

  of adjustment, which are not explained in detail.

  Once the cylindrical sleeve 23 of each measuring sensor 16 is disengaged in the measuring position 16 'of this sensor, in which the measuring sensor is held by the clamping bushes 28, the lifting piston is unloaded and is maintained. in the floating position by a hydraulic locking system, which is formed by pressure relief valves, prestressed check valves or the like, which are connected to the lifting cylinder 19 of the lifting piston 20 The hydraulic locking system is designed in such a way that a lowering stroke of the lifting piston 20 in the direction of arrow b is possible when the bearing cylinders 8, 9 are brought together, in which case the vacuum stroke 35 of the piston rod 22, which is associated with the lowering stroke of the lifting piston 20 relative to the cylindrical sleeve 23 of the measuring sensor 16, prevents the measuring sensor from being separated from the e its measuring position 16 'by the lifting piston 20 If the rolling mill is stopped, it can be

  by means of the lifting cylinder 20, penetrate the cylindrical sleeve 23 of each measuring sensor 16 in the direction of arrow b into the rest position inside the housing 15 of the measuring sensor in the element lower 9 mounting a support cylinder.

  As a modification of the embodiment described, the measuring device can be equipped with sockets

  hydraulic clamping device to hold the bushings

  in the measuring position 16 'of the measuring sensors 16.

Claims (5)

  1 Measuring device for determining the distance of the bearing cylinders of a cage   quarto mill as a control variable for the regulation of the grip between the rolls, comprising interchangeable boxes which are mounted in the internal elements;   lower and upper mounting of the bearing cylinders of the two uprights of the rolling mill stand, symmetrically with respect to the plane containing the axes of the rolls, and provided for measuring sensors and distance measuring devices, and in which the housings of the measuring probes   of the double-acting lifting pistons, which are movable in the lifting cylinders and which serve to disengage the measuring sensors in the measuring position and to engage them in the rest position, and on each lifting piston is a piston rod, which acts as a stop element and whose stroke is limited, when a measurement sensor is released from its housing, which is housed in a lower or upper element for mounting a bearing cylinder, to come to the measuring position for the distance measuring device arranged in an upper or lower element for mounting a support cylinder, by the abutment formed by an upper or lower element of of a support cylinder, and clamping sleeves, which allow axial displacement of the latter during engagement and release of these sensors and serve to hold the measuring sensors in the measuring position, are mounted d in the measuring sensor housing, characterized in that the measuring sensors (16) are in the form of cylindrical bushes (23), which are fitted on the rods (22) of the lifting pistons (20), are sealingly mounted with respect to the chamber (24) of the lift cylinders (19) on the piston rods (22) and can be moved over a defined idle stroke (35) on the piston rods (22), and for each cylindrical sleeve (23) acting as measuring sensor, at least one clamping bushing (28) is mounted coaxially with the axis (27-27) of the lifting cylinder   (19) in the housing (15) of the measuring sensors (16).   Measuring device according to Claim 1, characterized by a disk (34) which is mounted on the free end, facing the upper element (8) for mounting a support cylinder, rods (22). lifting pistons (20) which, when a cylindrical sleeve (23) acting as a measuring sensor (16) is disengaged, acts as a stop element with respect to the upper mounting element (8) of a support cylinder and serves as a drive member for the cylindrical sleeve (23), when the sensor is engaged. measure (16).   3 Measuring device according to the claims   1 and 2 taken together, characterized in that the cylindrical bushes (23) have, on their end facing the upper element (8) for mounting a support cylinder, an annular flange (26) forming an element contact for the distance measuring device housed in the element   upper (8) mounting of the support cylinder.   4 measuring device according to one of claims 1 to 3, characterized by two bushings of   mechanical clamping devices (28), which are mounted in opposite directions in the housing (15) of the measuring sensors (16) and have elastic tabs (29) for fixing the measuring sensor (16) in the housing. measuring position (16 ').