FI112512B - Shoe in a shoe press - Google Patents

Abstract

Shoe for a paper or carton machine's shoe press, in which the shoe comprises a frame (5) and a press surface (2), to which the press surface is set up so that set up to rest against a counter roller, where a continuous belt moves between the shoe and the roller. On the outlet side of the shoe, the shoe is equipped with a separate, shoe (1) with an attachment (9,10) in the frame of the press shoe (5), the shoe has a surface (18) that forms a part and/or extension of the pressure surface.<IMAGE>

Description

This invention relates to a shoe press shoe for a paper or board machine according to the preamble of claim 1.

5

In paper machines, compression normally takes place in a press nip between press rolls, whereby the paper web is generally passed through a press nip between water-absorbing press felts which pass through a press nip together with a paper web. The length and geometric shape of the press nip will significantly influence the result of the press.

A highly effective elongated press nip is provided by a shoe press. The shoe press has a slide-1. a press shoe with a concave pressing surface. The concave pressing surface is arranged against the counter roll, and an endless belt runs between the slide shoe and the counter roll 15 around the press shoe. The shoe press further includes a drive for pressing the sliding shoe against the counter roll. The sliding shoe is typically supported between two support members. Lubricating oil is fed between the sliding shoe and the strap by means of a feeding apparatus, and an elastic polyurethane sliding sleeve can be provided on the sliding shoe.

20

There is a great need to increase the speed of paper and board machines, and especially the pressures of the press. In order to meet the demand, a solution must be found, for example, to the problem of warming up the shoe press shoe so that, for example, an elastic polyurethane slip on the shoe does not overheat under operating conditions. The practical maximum temperature should be below 75 ° C. In order to reach operating temperature, the press shoe effectively removes the warmed oil from the discharge side. Traditionally, the oil has been deflated by the oil drainage duct, gutter, scraper, etc. behind the shoe, whereby the final oil removal is based on a slight overpressure inside the roll. Such ratios; 30 rails are not suitable for high line pressures, but the oil must be removed elsewhere. way.

There are also known solutions to enhance oil removal in the shoe area.

,.: Such known solutions are based either on ducting provided by casting; In addition, the oil drainage can be further enhanced by the design of the shoe. Such shoe presses are disclosed, for example, in WO 01/04412 and US 5,935,385. WO 01/04412 2 112512 discloses a shoe press having a one-piece press shoe with drain channels for removing lubricating oil in both the actual compression zone and the subsequent leaving area.

It is an object of the present invention to provide a solution which can very effectively remove oil from the outlet side of the press shoe and which is relatively easy to manufacture without the need for cannon drilling to make a channel.

In the solution of the invention, on the outboard side of the press shoe, a portion of the outer surface of the press surface is provided as a separate removable part which is mechanically locked and secured to the body of the shoe divided by fastening means. The removable part may include a stop surface of the press shoe which is part of the outer surface of the press shoe and corresponds to a prior art structure in which the sliding shoe 15 is supported between the two supports.

Details of the arrangement according to the invention are set forth in the appended claims.

In the following, the invention will be described in more detail by way of example with reference to the accompanying drawings, in which the pattern is a cross-sectional view of the shoe leaving edge where the shoe body operates: sideways response, v: ';

Fig. 3 is a sectional view A - A of the trailing edge of the press shoe, centerline of the machine, and ,,; Figures 4a-4c of Fig. 30 'are part of a surface in the area of a removable surface portion showing various pattern alternatives.

9 I

At the press side of the press shoe, part of the outer surface 2 of the press surface is detached into a separate part 1 which is mechanically locked and secured by fastening means 9, 10 to the shoe body part 5. en-11 11125 to a known structure 12 in which the sliding shoe is supported in place between the two supports. In this case, the part continues as far as the response is needed.

The design also allows for a separate, cross-machine locking-shoe 5 of the shoe 5, a slot guide 4. The guide 4 is secured by fastening means 7, either to the shoe body 5 or to the removable part 1. Transverse forces are transmitted

The part 1 includes, when removed, an open channel 13, which in use can be pressurized or depressurized, and which is connected to the external manifold by one or more flexible hose assemblies or tubes 14. The part 1 thus constitutes a separate suction other parts where heat generation can be controlled.

The heat dissipation from the part 1 is enhanced by openings, hole groups, openings 19, etc., which open on the surface 18 and which break the surface.

It is preferable to shape the surface with Figures 15-17 of Figs. 4a to 4c, whereby heat removal is effective. For example, the shapes can be achieved by machining with a pin blade.

It will be apparent to one skilled in the art that the invention is not limited to the exemplary embodiments set forth above, but is within the scope of the appended claims.

Claims (7)

A shoe for a paper or cardboard machine shoe press, which shoe comprises a body (5) and a press surface (2), the press surface being arranged to abut against a counter roll, an endless belt running between the press shoe and the counter roll, characterized by , that the shoe on the outlet side is provided with a separate, with fastening means (9, 10) in the frame (5) of a fixed shoe (1), which shoe has a surface (18) which forms part and / or an extension of the pressing surface. 10 Shoe according to Claim 1, characterized in that the surface (18) of the part (1) has worked grooves (19), preferably of different depths. Shoe according to claim 1, characterized in that inside the shoe there is an open channel (13) for draining the coolant. A shoe according to claim 1, characterized in that it comprises the support surface (11) of the split press shoe. 5. A shoe according to claim 1, characterized in that the open channel (13) is connected to an outer pipe network via one or more elastic hose assemblies or tubes (14). 6. A shoe according to claim 1, characterized in that the part (1) forms a separate suction or pressure shoe made of material other than the other parts of the shoe. '! 25 7. A shoe according to claim 1, characterized in that the counter part (4) of the shoe's middle support is secured in the shoe body (5) or shoe part (1) and the reading pin (6) in the counter part (12). * 1