FI113385B - Oil press duct for shoe press - Google Patents

Description

113385

SHOE PRESSURE OIL DRAINING CHANNEL

The present invention relates to an oil discharge channel for a shoe press 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 the paper money. 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 comprises a drive device 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 oil that has been warmed up on the leaving side. Traditionally, the oil has been removed by the oil drainage duct, gutter, scraper, etc. after the shoe, whereby the final oil removal is based on the slight overpressure inside the roll. Such rat-30 slips are not suitable for high line pressures, but the oil must be otherwise removed.

There are also known solutions to enhance oil removal in the shoe area. Such known solutions are based on either ducting or ducting made by casting canals, oil removal can be: · *: further enhanced by shoe design. Such shoe presses are disclosed, for example, in WO 01/04412 and US 5,935,385. WO 01/04412 2 113385 discloses a shoe press having a one-piece press shoe, in which drain channels for removing lubricating oil are provided 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 be very efficiently remove oil from the outlet side of the press shoe, and which combines an oil pocket solution design that allows for very complex space shapes, preferably with one pin blade machining. a circular tubular duct fixed by means of fastening means for recess machining on the press surface of the press shoe.

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

In the following, the invention will be explained in more detail by way of example with reference to the accompanying drawing, which shows a cross-sectional view of a shoe leaving-20 edge having an oil drainage channel according to the invention.

On the outboard side of the shoe press shoe 1, there is machined forming member 4 on machining surface 2 and 3, preferably groove / wedge connection, of transverse machine 1. CD-direction.

; 25

A separate solid channel 5, preferably a square or circular tube channel, is secured to the press shoe extensions by means of fastening means 6, such as bolts, through the press shoe of the recessed machining means 7 on the press surface 2. The fastening means 6 is preferably shaped.

30

The closed passageway 5 may include a contact surface 8 of the press shoe 1 which corresponds to the prestress. '. 12, wherein the sliding shoe is supported by means of supports 9 ''. Immersion machining 7 may be located on surface 2 at a desired location.

35 The closed duct 5 is connected by one or more flexible hose combinations: ··: or by pipe 12 to the manifold and further to the external system (not shown). The closed conduit 5 can be either overpressurized or underpressurized in use.

3, 113385

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.

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Claims (6)

4, 113385 An oil drainage channel for a shoe press shoe press (1) for a paper or board machine, wherein the shoe has a press surface (2) arranged against a counter roll, with an endless belt running between the press shoe and the counter roll, with a separate transverse (5), preferably a square or circular tubular channel fixed by means of fastening means, characterized in that the closed channel (5) is fixed by means of fastening means (6) from the recess machining (7) on the press surface (2) of the press shoe. Oil drainage channel according to Claim 1, characterized in that the opposite side (3) of the pressing surface (2) has a machining of the forming joint member (4) with an extension surface (10, 11), preferably a groove / wedge joint, in the transverse direction of the machine. Oil drainage duct according to claim 1, characterized in that the fastening means (6) is shaped to be permeable to the substance. 20 Oil drainage channel according to Claim 1, characterized in that the um-y · · · 'quick channel (5) includes a stop surface (8) of the press shoe (1) which corresponds in itself to: a known support 9 ..: 25 characterized in that um-; the quick release hub (5) is connected to the manifold or the like by one or more flexible hose combinations or tubes (12). Oil drainage duct according to claim 1, characterized in that the um-30 quick duct (5) is pressurized or under-pressed in use. 113385