FR2763265A1 - ROLL EXCHANGE DEVICE ON A THREE-ROLL OBLIQUE ROLL MILL - Google Patents

Abstract

- The present invention relates to a cylinder exchange device on a rolling mill with oblique cylinders with three cylinders. - According to the invention, the cylinder support consists of three beams (2a, 2b, 2c), the corners of which are provided. on an imaginary triangle, preferably isosceles, the lower fixed spar (2a) extending substantially horizontally and receiving, at its two ends, joints (4) for, respectively, one of the other two pivoting spars (2b, 2c ), around which the side members (2b, 2c), locked together in a removable manner above the cylinders (7) in the working position, can pivot, after release of the lock (5), in a disassembly position, in which the side members (2b, 2c), laterally separated from the two sides of the set of cylinders, release an opening through which the set of cylinders maintained by a holding device (10), in addition to the chocks (6), can be mounted and of mounted.

Description

The present invention relates to a cylinder exchange device

  dres on a rolling mill with oblique cylinders with three cylinders to pierce or stretch blocks pierced during the manufacture of tubes, the cylinders of which are mounted in chocks, in a removable manner, by means of transmission shafts coupled to the drives, in a common cylinder support, two cylinders being arranged, in a horizontal plane,

  symmetrically below the third cylinder.

  Three-cylinder oblique roll mills have been used for decades to drill massive round blocks and also to stretch the blocks drilled in the manufacture of steel tubes and tubes of other metals. The cylinders are further subjected to

  heavy wear and, therefore, must be often interchanged.

  As each exchange leads to a shutdown of the installation, we tried

  cé to shorten the durations of exchange. The logistics and construction cost

  tion at the level of the corresponding machine must in truth, for reasons

  price sounds, be as low as possible.

  The state of the art offers a series of solutions to accelerate

  and simplify the exchange. Document DE-2 233 078 thus describes a provision

  sitive who grabs the three chocks from the support cylinders and pulls them out of the

  rolling stand. The new parts are then introduced. An incon-

  vénient is that, for this, all the support must be removed from the rolling mill. Document DE-2 823 139 describes a similar device on a planetary oblique rolling mill with three cylinders. In this case, the three cylinders are gripped by a manipulator and removed from the support in the rolling direction. To provide space for the manipulator, the outlet side must be pivoted laterally. This is simple in the case of a planetary oblique roll mill, since the outlet side, as a rule, consists only of a single train of rollers which can be easily mounted on a frame. In conventional three-cylinder oblique roll mills, however, the exit side consists of roller train units, three-roller guides and a

  stop block for the drill chuck shank, i.e. a pivot-

would be very expensive.

  DE-3 226 871 describes a device in which all

  the chocks are mounted one behind the other on a carriage on rails.

  This carriage moves laterally and makes room for a second carriage with new parts. The new parts are then introduced one behind the other again into the rolling stand. The system described

in this case is very expensive.

  Furthermore, it is known, from document DE-1 961 092, a dis-

  positive which has a folding support. In this case, all jobs

  its are brought into a common plane and can be separated, individually, by a crane. Document DE-3 532 894 develops this proposal, and the folding support of the rolling stand is tight against the play appearing in the joints. This solution has the disadvantage that the foldable support, on the sides, occupies a lot of space and all the chocks of the cylinders must still be changed individually. The object of the present invention is to improve a cylinder exchange device of the indicated type, so that the cylinder exchange device takes up little space and the exchange time

  be shortened to the lowest possible minimum.

  To achieve this object, a remarkable device is proposed in that the cylinder support consists of three beams, the corners of which are provided on an imaginary triangle, preferably isosceles, the lower fixed beam extending substantially horizontally and receiving, at its two ends, articulations for, respectively, one of the two other pivoting beams, around which the beams, locked together removably above the cylinders in the working position, can pivot, after release of the lock, in a disassembly position, in which the side members, laterally distant from the two sides of the set of cylinders, release an opening through which the set of cylinders maintained by a holding device, in addition

  chocks, can be assembled and disassembled.

  The cylinder support is additionally provided with seals and is folded back so that the folded halves protrude only slightly relative to

  the width of the support. Before opening the support, the trans-

  mission driving the cylinders are released by means of a quick closure on the side of the cylinders and the holding device is put in place. Advantageously, according to another characteristic of the invention, it is provided that the holding device can be mounted on the chocks of the cylinders, and this can be locked in a fixed position of

support with chocks.

  When the support is folded, according to another characteristic of

  the invention, the holding device is manipulated by a crane, for example

  ple the workshop crane, or a transport system specially designed for this, and it can be removed from the support with the three chocks and the cylinders. Similarly, chocks fitted with new cylinders are again introduced and the support is closed. A particularly short cylinder exchange time can be obtained when, instead of the workshop crane, one works with a clean transport system, since, in this case, the introduction and extraction

  can overlap to minimize downtime.

  In this way, thanks to the invention, a solution is obtained.

  pide, saving space and economical for the exchange of rolls in three-cylinder oblique roll mills.

  Furthermore, the invention provides that, at least on the longitudinal members

  voting, there are guide bars which, when mounting a

  set of cylinders mounted in chocks, guide the hand-held device

  in the mounting position of the cylinders and their chocks.

  Of course, the chocks are oriented, for disassembly and for assembly, so that they always correspond to the points of

  fixing of the holding device. Also, the axes of adjustment of the cy-

  lindres as well as the chocks holding devices are made of

  so they can be easily released from the chocks.

  In another embodiment of the invention, it is provided that one of the

  pivoting spars, by its end zone, the chock of the cy-

  upper liner and, in this area, is arranged the adjustment device

for this cylinder.

  For this, the upper joint of the support halves is provided at the periphery of the upper chock, so that the adjustment of the cylinders

can still be done well.

  The figures in the accompanying drawing will make it clear how

the invention can be realized.

  Figure 1 shows the rolling stand according to the invention in the

working position.

  Figure 2 illustrates the rolling stand according to Figure 1 having the support folded and the holding device mounted in the exchange position.

  In FIG. 1, 1 designates a rolling mill with oblique cylinders.

  ques to three conventional cylinders, the cylinder support consists of three beams 2a, 2b and 2c. The lower beam is made so

  fixed and, being on the base plate 3, is connected to the workshop floor.

  The pivoting beams 2b and 2c of the support are pivotally connected by articulations 4 provided at the two ends of the fixed beam 2a of the support. In the working position shown of the rolling mill

  oblique cylinders with three cylinders, the upper ends of the lanyards-

  rons 2b, 2c are removably connected to each other at 5. The em-

  poises for the rolls, designated by 7, of the rolling mill with oblique cylinders are designated by 6, which can be adjusted, in a known manner,

  on guides 8 of the side members 2a, 2b, 2c by means of axes 9.

  In Figure 2, there is shown the disassembly position for the set of cylinders. We see the beams 2b, 2c pivoted outward around the joints 4 and the opening of the rolling stand upwards. By means of a lifting device not shown, for example the crane of the foundry, the holding device 10 is gripped by the hook 1 1

  and the cylinders 7, together with the chocks 6, are complete-

  ment removed. Similarly, but vice versa, a new game of

  rolls is inserted into the rolling stand and is mounted in the posi-

  tion of work. After pivoting of the beams 2b, 2c in the working position of the rolling mill with oblique cylinders, these are locked at 5. It can be seen that the beam 2b, at its upper end, has a shape

  hook, so that the adjuster 9 can be positioned above

  above the choise 6 of the upper cylinder.

Claims (5)

  1. Device for exchanging cylinders on a rolling mill with oblique cylinders with three cylinders for piercing or stretching blocks drilled during the manufacture of tubes, the cylinders of which are removably mounted in chocks, by means of transmission shafts coupled to the drives, in a common cylinder support, two cylinders being arranged, in a horizontal plane, symmetrically below the third cylinder,   characterized in that the cylinder support consists of three lanyards   rons (2a, 2b, 2c), the corners of which are provided on an imaginary triangle, preferably isosceles, the lower fixed spar (2a) extending so   substantially horizontal and receiving, at its two ends, articulations   tions (4) for, respectively, one of the two other pivoting beams (2b, 2c), around which the beams (2b, 2c), locked together in a removable manner above the cylinders (7) in the working position,   can pivot, after release of the latch (5), in a position of   mounting, in which the side members (2b, 2c), laterally distant from the two sides of the set of cylinders, release an opening through which the set of cylinders maintained by a holding device (10), in addition to the   chocks (6), can be assembled and disassembled.   2. Cylinder exchange device on a rolling mill with oblique cylinders with three cylinders according to claim 1, characterized in that the holding device (10) can be mounted on the chocks (6) of the cylinders (7), and that -this can be locked in a   fixed holding position with chocks (6).   3. Cylinder exchange device on a three-cylinder oblique cylinder rolling mill according to claim 1 or 2, characterized in that the holding device (10) can be manipulated by   a crane or a transport system specially designed for this.   4. Cylinder exchange device on a roll mill   oblique to three cylinders according to one of claims 1 to 3,   characterized in that at least on the pivoting beams (2b, 2c), are   provided with guide bars which, when mounting a set of cylinders,   dres mounted in the chocks (6), guide the holding device in   the mounting position of the cylinders (7) and their chocks (6).   5. Cylinder exchange device on a cylinder rolling mill   oblique to three cylinders according to one of claims 1 to 4,   characterized in that one of the pivoting beams (2b or 2c) spans, by its end zone, the chock (6) of the upper cylinder (7) and, in this   zone, is arranged the adjustment device (9) for this cylinder (7).