FI121889B - Press roll, which includes a press shoe movably mounted on a bracket - Google Patents

Description

PRESSURE ROLLER WITH MOUNTING MOUNTING PRESSURE BOX

The present invention relates to a press roll comprising a press shoe movably mounted on a bracket and a roll sheath, the press shoe comprising a bearing surface to which the roll shell corresponds to its inner surface, and wherein the bearing surface is provided with at least one row of oil supply points.

Such press rollers known in the art are used in connection with dewatering rolls for dewatering the mas-10 web, in particular paper or pulp web, whereby the dewatering web, if necessary in parallel with the suction web, e.g. felt, is guided between the . In order to increase the effective surface between the counter roll and the roll mantle and to improve dewatering, the press shoe has an elongated support surface 15 with a radius of curvature adapted to the radius of curvature of the counter roll. The press shoe or its support surface is arranged such that the gap between the support surface or the roller sheath passing over it and the counter roll is reduced in the direction of movement, thereby increasing the drainage power. However, in this case, the pressure in the nip and in the gap between the support surface and the inner surface of the roll shell from the inlet edge to the outboard edge increases more or less continuously depending on the curvature or the profile of the tu-20 surface.

However, increasing pressure in the gap between the support surface and the inner surface of the roll shell causes problems in lubrication of this heavily loaded contact area, particularly slow-running machines (e.g., pulp dewatering machines at speeds of 60 m / min to 250 m / min). lubrication in this area.

δ ^ This purpose is accomplished by means of a press roll according to the preamble such that the oil supply points are formed by openings in the support surface which are provided with inserts of oil-permeable, wear-resistant material with a surface facing the roller sheath | 30 forms an integral surface with the support surface.

00 00 o The inserts provide a continuous sliding surface for the roll mantle without the recesses otherwise formed by the openings, which prevents the roll mantle from being provided in these areas.

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The oil is distributed to the openings and further to the entire support surface through the supply channels.

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Within the scope of the invention, it is advantageous that two rows of oil supply points are arranged on the support surface in the direction of movement of the roll shell.

Preferred embodiments of the invention are set forth in the subclaims.

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Preferred embodiments of the invention will now be described with reference to the accompanying drawings.

Fig. 1 is a sectional view of a press shoe of a press roll, Fig. 2 a simplified pu-10 shoe and Figs. 3-8 of various embodiments of inserts that can be used in accordance with the invention.

Fig. 1 is a sectional view of a portion of a press roll according to the invention showing a press shoe 1 mounted on a fixed support 2. The press shoe 1 is attached to 15 support 2 by two piston / cylinder units 3,4 for adjusting and adjusting the press shoe contact pressure from drawing to invisible back roll.

The bracket 2 facing away from and towards the counter-facing side of the roll press 20 comprises a shoe supporting surface 6, over which the roll mantle 7 slides in the direction of the arrow 8. Since the press shoe is pressed against the inner surface 9 of the roll shell 7 under high pressure, the bearing surface 6 and the inner surface 9 of the roll shell are subjected to a high frictional load, so good lubrication is of great importance for the life of these parts.

In the embodiment of the press roll according to the invention according to Fig. 1, lubricating oil etaan is supplied from the supply channels 10, 11 to openings 12, 13 opening on the support surface 6. The first row ^ openings 13 are arranged immediately after the inlet edge 14. The amount of lubricating oil imported here-

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The function of the lubricant is to replace the proportion of the oil adhered to the roll shell 7 and wiped uncontrollably at the entry stage and to ensure complete lubrication. In addition, supply of lubricating oil The inlet region 30 cools the roll sheath 7 and the press shoe 1. The hydraulic compression pressure may be within this range between 2 and 3 bar, depending on the operating setting.

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The second row of openings 12 is in the direction of movement of the roll shell 7 in the rearward region of the support surface 6. The purpose of this line is to ensure that the lubricating oil does not escape here against the machine direction due to the high hydraulic pressure of 35 bar, e.g. 60 bar. This ensures a uniform lubrication film at lower speeds. A further advantage of this oil supply point is that the oil supply further cools the press shoe 1 and the roll shell 7 in the region of the leaving edge 15.

The openings 12, 13 of the support surface 6 are provided with inserts 16, 17 of oil-permeable, wear-resistant material, preferably of sintered metal, in the direction of the roll shell 7 of the inserts 16, 17 so that, despite the oil feed openings 12, 13, a uniform sliding surface is formed, which prevents the roll shell from stretching in this area. In addition, the necessary differential pressure is provided to optimally distribute the lubricating oil 10 through the inserts over the entire support surface.

Fig. 2 is a simplified schematic representation of a press shoe showing only the roll sheath, lubricating oil supply pipes 10, 11 and the inserts 16, 17 fitted in the openings 12 and 13.

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The following Figures 3-8 schematically illustrate various embodiments or combinations of different inner shapes.

Thus, Figure 3 shows an embodiment using two rows of circular inserts 16, 17. The production of these circular bores and inserts 16, 17 is inexpensive. However, the disadvantage is the greater number of feed channels and a somewhat poorer distribution of the lubricating oil to the support surface.

Figure 4 illustrates an embodiment in which the circular inserts 16 are connected to a strip or elongated insert 17. Each of the circular inserts 16 has a single inlet channel 10, while the strip inserts 17 comprise ^ two supply channels 11. The advantage of the molded inserts is better lubricating oil and 00 9 reduction in the width of the support surface and a smaller number of feed channels. The disadvantages are the higher manufacturing costs.

In the embodiment shown in Fig. 5, two strip-shaped inserts 16, 00 o 17 are provided, each with two lubricating oil supply channels 10, 11.

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Fig. 6, in turn, shows an embodiment in which, as in Fig. 4, a ribbon-shaped insert 16 is connected to a circular insert 17, although the order of movement of the roll shell 7 is reversed.

Figure 7 shows an embodiment in which the row inserts arranged in a row are connected to three strip inserts which are also arranged in a row.

Finally, Figure 8 shows an embodiment having three strip-shaped inserts 16 and 17, respectively, in each case. The three embodiments of adjacent strip-shaped inserts provide a good compromise, good distribution, low feed rates and good manufacturability.

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Claims (10)

A press roller with a pressable shoe (1) slidably mounted on a carrier and with a roller sheath (7), wherein the press cone (1) has a supporting surface (6) on which the roller sheath (7) rests with its inner surface (9), and wherein in the direction of movement of the roller sheath (7), at least one row of oil supply points (12, 13) is provided, which are formed by openings (12, 13) in the support surface (6), characterized in that in the oil supply points (12, 13) inserts (16, 17) of oil-permeable, wear-resistant material are provided, the surface facing the roller sheath (7) forming a continuous surface with the supporting surface (6). 10 Pressing roller according to claim 1, characterized in that two rows of oil supply points (12, 13) are arranged in the direction of movement of the roller sheath (7). Press roller according to claim 1 or 2, characterized in that the inserts (16, 17) consist of sintered metal. Pressing roller according to any of claims 1 to 3, characterized in that a separate supply circuit (10, 11) is provided for each row of the oil supply points (12, 13). Pressing roller according to any one of claims 1 to 4, characterized in that each oil supply point (12, 13) has its own supply channel (10, 11). Pressing roller according to any of claims 1 to 5, characterized in that for an oil supply point (16, 17), several supply channels (10, 11) of a supply circuit are provided. 25 Pressing roller according to any of claims 1 to 6, characterized in that at least part of the openings of the oil supply points (12, 13) have a circular cross section. δ (M co Pressing roller according to any of claims 1 to 7, characterized in that at least a portion of the o-openings of the oil supply points (12.13) have an elongated cross section. 0 CC Pressing roller according to claim 8, characterized in that the openings extend parallel to the axis of rotation of the roller sheath. sj- o tn o ° 35 Pressing roller according to claim 9, characterized in that at least one oil supply site extends substantially over the entire length of the support surface.