FI95674B - Method and apparatus for guiding steel strip - Google Patents

Description

95674

Method and apparatus for guiding steel strip 5

The invention relates to a method and a device for guiding a steel strip about the longitudinal axis of a continuous press according to the determining part 10 of claim 1.

In such hot plate presses, the slider and the press table consist only of stiffening plates and the transverse ribs connecting them (DE-OS 31 49 234, DE-OS 37 02 995). A plurality of stiffening plates 15 with transverse ribs are welded together into individual beams, which further represent the length of the slider and press table, and thus the hot plate press, with the alignment and installation of the heating plates in a row. Extensions or protrusions extending to the left and right of the stiffening plates act as counter-supports to the draw frame-press body for raising and lowering the slider, in which case the short-20 ku press cylinder piston devices are traced between the upper cross-members and the slider members.

The use of continuous presses, whether hydrostatic or with rotating support rods, has shown that once the presses have been extended to achieve higher outputs, the required steel strip adjustment is no longer controllable. The length limit of the press is about 28 m. For presses longer than 40 m and longer, for example a) slight disturbances in the lubrication of steel strips and reels 30 b) uneven volume weight distribution disturbingly on-line adjustment so that it is not always possible to center the steel strip and re-center with angle adjustment of the drive and swivel drum shafts according to the state of the art. In the area of the heating plates, and this applies in particular to the first third of the 2 95674 high-pressure zone, the steel strips are firmly tensioned as in a screw press. In drum shaft adjustment above the transfer distance, an entry area is created because the steel strip is not tensioned at this point, in part a longer length than in the tensioned area. The same applies to the 5 discharge heads. The ratio of the stressed distance in the high pressure range of the elongating presses thus becomes increasingly unfavorable compared to the inlet and outlet parts. In order to avoid one-sided overstretching of the steel strips when adjusting the travel of the steel strip, the press must be stopped and all associated disadvantages must be taken into account.

10

The object of the invention is to provide a method by means of which the adjustment of the steel strip during the use of the press is possible with respect to the longitudinal central axis and in particular without unilateral overstretching of the steel strip, and a device by means of which this method can be implemented.

15

A solution to achieve this object is presented according to the invention in the characterizing parts of claims 1 and 4.

With the solution according to the invention, it is achieved that the steel strips can be adjusted by means of adjusting piston devices on the drive and / or pivot drum shafts relative to the longitudinal central axis of the press also during operation on the slider and / or press table without damaging the steel strips. A prerequisite for this is the flexible formation of the slider in the high-pressure range and possibly also in the medium-pressure range, in which case it is only possible to lighten the short-shock pressure cylinder on the respective longitudinal side. Advantageously, so that the individual beams of the high pressure range and possibly also the medium pressure range, with the slider still rigid in the low pressure range and possibly also in one part of the medium pressure range and receiving the given compression pressure vertically, can perform a limited amount of vertical press the individual bars upwards accordingly. For this indirect pressure build-up in the slider and its resulting oblique position around the angle α, it is further preferred that the slider is hung on the press table above the tension frame-press body by means of free-running drawbars.

A further advantage is that when the press is serviced, for example in the length of the heating plate to change it to a length of about 4-5 meters, the corresponding tension rail package can be turned laterally so as to provide more free access to the corresponding pressure range.

Other features and advantages of the invention will become apparent from the subclaims and the following drawing-based description of an exemplary embodiment.

Fig. 1 is a front view of a press according to the invention in section A-B according to Fig. 3 without steel strips and drive and turning drums.

Figure 2 shows a press according to the invention in a vertical view from the inlet to the central part.

Fig. 3 shows the press according to Fig. 2 in a plan view.

Figures 4,5 and 6 show the flexible formation of the individual beams with respect to each other.

Figure 7 is a schematic plan view of a press according to the invention.

25

As shown in Figures 1 to 7, the continuous press 1 consists essentially of a fixed press table 2, a movable press table or slider 3 and duct frame press bodies 36 arranged on both longitudinal sides of the fixed press table. and as a bearing location for drive drums 37, pivot drums 9 and 10, and adjusting cylinder piston devices tracked on shafts IV-IV and VV. The slider 3 and the press table 2 consist only of stiffening plates and the transverse ribs connecting them. A plurality of stiffening plates with transverse ribs 4 95674 are welded together into individual beams 8 which, with the alignment and installation of the heating plates 14, form a slider 3 and a pressing table 2 and thus the length "1" of the hot plate press. Extensions or projections extending to the left and right of the stiffening plates act as counter-supports for the pull frame-press-5 body 36 for raising and lowering the slider 3, in which case the short-stroke press piston devices 15 and 16 are arranged between the upper cross-members 23 and the slider 3.

The draw frame clamp body 36 consists of two draw rails 13, an upper cross member 10 and a lower cross member 22. The upper and lower cross members 23 and 22 are provided with left and right projecting pins 26 or bolts 26. To connect the cross members 22 and 23, the tie rods 13 are looped 27 pins 26 or trees 26.

The crosspiece 22 or 23, from which the drawbars 13 are turned out, are provided with bolts 26 which can be pulled out if necessary. The overall construction of the press thus allows the drawbars 13 still vertical next to the drawbars 13 folded out to the left and right (see Fig. 3) to freely support the slider 3 to such an extent that, for example, the heating plates 14 and other parts can be serviced and repaired.

Figures 1-7 further show that unilateral lifting is possible *.! around the angle ulla on the longitudinal side I-I or Π-Π of the slider 3 in the flexible region "e", preferably comprising a high pressure region HD and half of the medium pressure region MD, so that the steel strips 5 and 6 can be lightened as additional assistance in guiding the steel strips The lightweight pressure cylinder 7 and 15 in the region of the traction frame-press body 36 can preferably be lightened by * pressurizing the short-shock cylinders 7 and 15 arranged transversely to the longitudinal center ΙΠ-ΙΠ in a row on the individual beams 8 from the opposite longitudinal side II or Π or II with continuously increasing compression pressure.

... Figures 2 and 7 show the letter "e" for the flexible area of the slider 3, 5 95674 which may also comprise the entire medium pressure range MD in devices with a particularly high compression pressure.

However, a prerequisite for the flexible slider, i.e. the movable pressing table 3, is the flexible connection of the individual beams 8 one below the other, so that control of the asymmetrical pressure profile in the high pressure range HD and possibly also in the medium pressure range MD is possible. Figures 4,5 and 6 show three alternative solutions for the flexible arrangement of the slider 3 in the areas intended for it. According to Fig. 4, steel springs 28 are arranged between the individual beams 8, which behave under the effect of back pressure like leaf springs. In all three examples, the arrow and dashed lines show the vertical alignment of the individual beams 8 in descending order. Instead of steel-elastic members, rubber-elastic bodies 33 are arranged between the spacer pieces 39 and 40, in connection with which the individual beams 8 are connected to drawbars 29, which similarly flexibly change their shape in connection with vertical movement. The individual beams 8 according to Fig. 6, in turn, are connected to the drawbars 29 and form form-fitting joints on the sliding surfaces 30. In order for the two individual beams 8 to hydraulically abut each other, spacers 31 and 32 with clearance 34 and 35 are then tracked. left and spacer 35 with right single beam 8. The clearance 34 and 35 are in each case about 0-1.2 mm (i.e. max. 2.4 mm). This possibility of movement corresponds to the allowable elastic deformation of the drawbars 29 within the stress-resistant tension and is also sufficient to relieve the pressure on the steel strips 5 and 6 without transferring them unilaterally.

25

Since a part of the slider, i.e. the movable pressing table 3, is formed flexible according to the invention, the pressure or travel profile according to the adjustment strategy 30 can be briefly adjusted to the left or right in the direction of travel during operation of the continuous press 1 to support and enable the steel strip. This means that the slider 3 is briefly driven from its horizontal position to an oblique position by means of an external short-shock pressure cylinder 15. The slider 3 is guided for a short time around the angle α 6 95674 in the flexible region "e" of the half of the high pressure region HD and, if necessary, of the medium pressure region MD from the inlet side to the outlet side. In this case, a pressure relief is optionally created for the left or right or longitudinal side I-I or Π-Π so that the steel strips S and / or 6 can be guided again by means of the adjusting cylinder 17 (see Figs. 2 and 7) around the angle β of the longitudinal central axis. The two control processes must be determined relative to each other 5 so that the adjustment of the drum shafts IV-IV and / or V-V does not begin until the relief of the short-stroke pressure cylinders 7 and 15 has already taken place or at least started.

In order to support the oblique position control at an angle α with the short-stroke cylinders 15, the pressures of the Multipot cylinders 7 can also participate from the left or right 10 by changing the cylinder forces of the supports in this adjustment process. If the steel strip is again on the longitudinal central axis, the slider 3 is guided horizontally at an angle α = 0. In the process described here, the continuous press always remains horizontal in the area of the medium pressure range MD and the low pressure range ND and acts as a calibration press. When the flexible slider area is limited in the high-pressure range HD-15 by an angle α, in the flow direction in the area of the inlet angle, a continuous non-cutting densification occurs.

It can be further seen from Figure 2 how the pivot drums 9 and 10 form the inlet slot 4 and how the roller bars 11 running around the slider 2 of the press table 2 and 20 with the steel strips 5 and 6 and guided to the guide chains 12 rest against the counter support of the press table 2 and the slider 3. In other words, the circumferential winding rods are arranged in a rolling manner between the hot plates 14 and the steel strips 5 and 6.

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Claims (7)

A method for guiding steel strips (5,6) about a longitudinal axis (ΙΠ-ΠΓ) in a continuous press (1) for the production of particle boards, fibreboards or plywood sheets 5 by means of spray pressure and flexible, endless steel strips (5,6) which draw the product to be pressed through the press is guided by means of drive drums (37) and pivoting drums (9, 10) around a press table movable (3), respectively (2) and supported by an adjustable press slot against the press tables (2,3) with accompanying roller bars 10 (11) whose shafts are guided transversely to the direction of travel of the strips, whereby the axes (IV-IV, VV) of the drive drums (37) and / or the reversing drums (9, 10) can be changed by adjusting from the other longitudinal side by means of pressure cylinders (17). IV-IV and / or VV) around the angle β is performed from the second longitudinal side (II and / or or 15 Π-Π) only when the short-stroke pressure cylinders (7,15) are connected in the high-pressure range (HD) of the same longitudinal side for short-term relief. Method according to Claim 1, characterized in that the short-stroke pressure cylinders (7, 15) of the transverse row of the individual beam (8) are pressurized continuously from the opposite longitudinal side (Π-ΙΙ or II) of the press (1) to the longitudinal outer side (II or Π-Π) of the press. with increasing compression pressure during shaft adjustment. • Method according to Claim 1 or 2, characterized in that the short-stroke pressure cylinders (7, 15) of the medium pressure range (MD) are also connected for short-term relief during shaft adjustment. Device for carrying out a method according to one of the preceding claims, characterized in that the individual beams 30 (8) of the movable pressing table (3) are resiliently connected to each other in the compression plane in the high pressure area (HD) and the suspension bars (13) are traced on the pressing beams (13). ), wherein the crosspieces (22 and 23) are provided with bolts and / or pins (26) on which the drawbars (13) can be mounted by means of loops (27). 95674 8 Device according to Claim 4, characterized in that the individual beams (8) of the movable pressing table (3) are connected to one another by means of spring elements (28, 33) in the high-pressure region (HD). 5 Device according to Claim 4 or 5, characterized in that the individual beams (8) of the movable pressing table (3) are connected in the high-pressure region (HD) by spacers (31, 32) which have a vertical clearance (34-35) via a sliding surface (30). , and the drawbars (29) to each other. 10 Device according to one of Claims 4 to 6, characterized in that the first halves of the individual beams (8) of the movable pressing table (3) are also resiliently connected to one another in the central pressure range (MD). t c 1 ti m.i mu m 4 a; «9 95674