FI85039C - Paper machine with movable rod - Google Patents

Description

1 85039

Paper machine with moving bar

The invention relates to a paper-5 machine with a movable bar, in particular for changing a wire on a manufacturing table of a paper machine.

In a classic paper machine, the pulp settles as a mat on one end of the manufacturing table and a continuous sheet directed in the direction of the press 10 is separated from the other end. The length of the production table is more than 15 m. It is covered with a wire, which is an endless base under and over the production table and removes some of the water contained in the mass when transporting the pulp on the production table, increasing the fiber content from 1% to about 27%. .

The continuous wire is subject to a certain wear and tear phenomenon, in which case it must be replaced after an average lifespan of 2-3 months. Changing the wire is a rub-20 sat and a long procedure.

On machines with a pull-out wire section, the table is moved transversely out of the paper machine, and then the wire is replaced and the table is refitted. ..25 The table may weigh more than 40 t; thus, a substructure comprising support rails is required, the roller rolls are subjected to strong mechanical stresses and the operation takes about 8 hours.

30 In other so-called in free-standing machines, the table supports are removed from the second longitudinal side, on the machine user's side, and the entire table rests on another side, the side comprising the intermediate members. The used wire is cut and removed. The new wire is mounted in place on a guide 35 parallel to the machine, slid on a table, and then tensioned by means of tension rollers placed under the table. Finally, the supports are installed.

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In order to reduce the mechanical stresses due to free support, it is known to connect a beam weighing 1-2 t from the outside, fasten it to the table through a ring formed by a new wire and lock it with the end of the beam 5 on the ground. Since the table then rests on this bar, the table supports can be removed from the user side and the wire can be replaced. The attached beam method has certain disadvantages. First, the beam and its support must be stored, which takes up space. After that, the beam must be tent-handed, which requires, for example, a bridge crane. Finally, during difficult operations due to the beam mass, the risk of tearing the new wire is quite high. In order for the machine to be robust, it must also have a groove structure on the opposite side of the user when it is installed freely.

It is known from U.S. Pat. No. 2,903,060 to construct a free-bearing paper machine with remotely controlled beams consisting of fixed cylinders in which the pistons can slide. The pistons are displaceable using compressed air 20 through coaxial channels relative to the beams. While such an implementation is satisfactory at the design level, it is mechanically very disappointing; with beam lengths of this type of machine, tightness problems are very difficult to solve and control of piston movements with compressed air 25 is almost impossible to implement.

It is an object of the invention to avoid the above-mentioned disadvantages by enabling easy and quick replacement of the wire. on free-standing paper machines.

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The present invention relates to a paper machine with a free-standing production table, comprising cross-members on removable supports, wherein each support comprises a movable beam which is movable longitudinally with respect to the support, the free end of which is hydraulically passable through a new table-mounted wire ring. on a lever so as to enable the removable supports to be removed and a new wire to be fitted, the machine being characterized in that the movable beam rests on a carriage suspended on a projection by means of a axis of rotation.

According to other features of the invention: 5 - the trolley forms the base of the roller supports, some of which are guided by a steering wheel, - the trolley rests on a support reinforcement projection, 10 to replicate support burdens.

As an example, the following drawing illustrates: Figure 1: partial longitudinal section of a free-standing paper machine manufacturing table according to the invention

Figure 2: table according to Figure 1 from the left during the wire change operation.

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Figure 3: sectional view along the line AA in Figure 2

Figure 4: sectional view along the line BB in Figure 2.

30 Figure 1 illustrates the production of table 1, for classical paper machine, which is coated with, for example, a plastic wire 2, which is endless and is pulled in the arrow direction. The pulp from the headbox 3 is lowered onto a wire and, once it has passed through the table, the sheet 35 is separated at 4 and directed towards the press. The wire is tensioned under the table by tensioners such as 5.

In the case of the cross braces 6, 7, the table rests on detachable supports 8, 9.

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Figure 2 shows better the location of the crossmembers and removable supports. The support 6 has a movable beam 10 which is profiled in an I-shape and is made of, for example, mechanically welded steel. The bracket 6 extends to the right 5 slightly outside the removable support 8 to guide the movable beam 10. At the end of the beam inside the bracket is an upper disc 11 and a lower disc 12. The upper disc 11 is preferably convex, height-adjustable and mounted on bronze rings. It repeats the stresses 10 due to the torque caused by the rotation of the beam when its center of gravity exceeds the wheel bases of the carriage 13.

The disc 12 is preferably mounted on a ball joint roller bearing 15. It repeats the stresses due to the torque of the lever arm d. The outer end of the beam 10 rests on a carriage 13 suspended from a protrusion 14 which reinforces the support 6. Outside the support 6 there is a wedge 15 which is fixed under the protrusion 14 to transmit the table support stresses when changing the wire 20.

When the movable beam 10 is in the working position (Fig. 2), its free end rests, for example, on a hydraulic lever 16, which acts as a support for the table. In this case, the removable support 8 can be removed and the stability of the table can be ensured between the movable beam 10 between the lever 16, the lower disc 12 and the wedge 15.

It can be seen from Figure 3 that the carriage 13 is suspended on a PTO shaft 17. The carriage has four discs, such as 18, 19, which 30 support the beam 10. The discs 18 can be rotated in the same direction by the steering wheel 20 to move the beam in the bracket 6. in a carriage suspended from a single axle, a better distribution of loads between the four discs, which serve as a support base for the 35 beams, is allowed.

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It can be seen from Figure 4 that the beam 10 has a cross bar 21 in the plane of section BB. The bar is locked between two hooks of the safety lock that stop the beam in the working position.

In the paper machine according to the invention, the wire is changed as follows: a new wire 23 is placed parallel to the table 1 on a guide consisting of wire rods 24 and wire rod supports 25 (Fig. 2). By means of the guide wheel 20, the beam 10 is removed from the support 6 so that it passes through the ring formed by the new wire.

The bar is locked in place with a security lock.

The hydraulic lever 16 is mounted in place under the free end of the beam 10 and by loading the lever 16 the support stress of the table 15 is repeated in this lever. Remove the removable support 8. The used wire is cut and removed. The new wire 23 is installed by moving it transversely and tensioned. The detachable support 8 is installed in place, the lever 16 is released, the safety lock is removed and the beam 20 10 is returned to the support 6 by means of the steering wheel 20.

The fitting of the movable beam according to the invention brings many advantages. First, it is a simple mechanically welded beam made of steel, profiled in an I-shape. For Toi-25 sex, it’s completely placed inside the bracket, so it’s always available and in place; it does not need to be stored in a special place. Because it is in the support, it is always protected, specifically from water, because it is protected at the front by a protrusion 14. Its installation is performed by a simple operation of the steering wheel 30 without the use of other handling devices. One required external accessory is the classic hydraulic lever. Finally, changing the wire only takes about an hour, which greatly reduces machine downtime.

The invention has been described only with respect to the area of the paper sheet manufacturing table. It goes without saying that it is suitable for all parts of the papermaking line where the wire has to be replaced.

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Claims (5)

6 85039 A paper machine with a free-standing production table, comprising transverse supports on detachable supports, each support (6, 7) comprising 5 movable beams (10) movable longitudinally relative to the support and having a free end after passing a new wire to be mounted on the table (1) (23) rests on a hydraulic lever (16) so as to allow the removable supports (8, 9) to be removed and 10 new wires to be fitted, characterized in that the movable beam (10) is in the projection (14) of the axis of rotation (17) on a suspended carriage (13). Paper machine according to Claim 1, characterized in that the carriage (13) forms the base of the roller supports, some of which (18) are pulled by means of a steering wheel (20). Paper machine according to Claim 1, characterized in that the carriage (13) rests on the reinforcing projection 20 (14) of the support (6). Paper machine according to Claim 1, characterized in that the beam (10) has a cross bar (21) which cooperates with the safety lock hooks (22) to lock the beam in the working position. Paper machine according to Claim 3, characterized in that a wedge (15) is fastened under the projection (14) to reproduce the support stresses of the table. 7 85039