FI105232B - Hydrostatically journalled roller for a paper, cardboard or after-treatment machine - Google Patents

Abstract

The present invention relates to a hydrostatically journalled roller for a paper, cardboard or after- treatment machine, the journaling comprising at least three hydraulically loadable bearing elements 3, 5, freely mountable around the axle 1 in the radial direction of the axle. According to the invention, two of said bearing elements are always provided with a cartridge valve 4 which is mechanically engaged at respective bearing elements 3, and which automatically compensates the load against respective bearing elements 3. <IMAGE>

Description

V

105232

Hydrostatic roller for paper / board or finishing machine

The present invention relates to a hydrostatic-bearing roll of a paper / board or finishing machine, wherein the bearing comprises at least three hydraulically loaded bearing elements that are freely positioned around the axis of the roll 5 in the radius of the shaft.

Prior Applicant F1 application 970625 of the present application discloses a bearing control system for a hydrostatically-mounted roller 10 in which the bearings utilize freely positioned bearing elements around the roll axis. This publication is directed to a solution having a main bearing acting in the main load direction and a counter bearing acting in the opposite direction, and side bearings acting in opposite directions transverse to the main loading direction. The function of the side bearings is to keep the shaft in its proper position 15 and to dampen the vibration in the transverse direction.

It is an object of the present invention to provide an improved hydrostatic bearing of a paper / board or finishing machine where the loading direction is more freely selectable and does not require separate side bearings. To accomplish this 20 objective, the hydrostatic bearing roll according to the invention is characterized in that at least two of said bearing elements are each provided with a cartridge valve mechanically coupled to said bearing element which automatically compensates for the load on said bearing element.

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In the following, the invention will be described in more detail with reference to the accompanying drawings, in which: - Figure 1 schematically shows an embodiment of a hydrostatic bearing 30 according to the invention, Figure 2 schematically shows another embodiment of a roll according to the invention;

1-3 the same reference numerals are used for like or like parts.

The embodiment according to Fig. 1 comprises three hydraulically loaded bearing elements 3,5, which are disposed about the shaft 1 of the roll and connected to the bearing bracket 2 so that they are freely positioned in the radial direction of the shaft 1. Each bearing element includes a bearing shoe 8 against a roll shaft 1, which is secured to a piston member 7 arranged to move in a bore 6 formed in the bearing bracket by hydraulic fluid supplied to the chamber space 12 of the piston member 7. The hydraulic means can pass through lubricating oil pocket 11 formed on the sliding surface of the bearing shoe 8 through capillary bores 10 in the bearing element so that an oil film is formed between the bearing shoe 8 and the shaft 1 through which the bearing shoe 8 is supported against the shaft 1.

In the embodiments shown, the bearing elements designated by reference numeral 3 are each provided with a cartridge valve 4, while the bearing element 20 designated by reference numeral 5 is subjected to a hydraulic fluid loading at constant pressure. The cartridge valve 4 is mechanically connected to the bearing element 3 via a pin portion 13 connected to the end of the piston part 7. The supply pressure Ps is passed from the housing of the cartridge valve valve 4 through the opening 9 in the valve wall to the space between the valve slide and the inner wall and further through the opening 14 in the bottom of the valve to the control pressure P0 or the spring force F which moves the cartridge valve slide 15 towards the opening 14 as the supply pressure Ps moves the bearing element 3 towards the shaft 1. FIG. 1 illustrates an spring 16 which produces a spring force F and FIGS. preferably branched from a line of supply pressure Ps. As the loading force, e.g., caused by the nip load, against the bearing element 3, the bearing element moves in the loading direction and the pin member 13 is moved by the slider 15 to open the opening thus automatically compensating for the increase in load force. In FIG. This is only an example of a placement method and the bearing elements 3 with cartridge valve 4 can be placed closer to each other or further apart 10 with a constant pressure supply bearing element 5 disposed on the opposite side to the bearing elements with cartridge valve. Also, the bearing element 5 need not be symmetrically positioned with respect to the bearing elements 3.

Figure 2 shows another embodiment of the invention in which four bearing elements 3.5 are disposed about the shaft 1, two of which are provided with a cartridge valve 4, the other two being loaded with constant pressure hydraulic fluid. In the illustrated embodiment, the bearing element 3 with the cartridge valve is in each case substantially diametrically opposed to the bearing element 5 having a constant pressure supply. Also in this embodiment, the distances between the bearing elements may differ significantly from the shown distance of about 90 °.

Figure 3 shows another preferred embodiment of the invention having three bearing elements 3 disposed about an axis 1, each bearing element being provided with a cartridge valve 4. This is the most preferred embodiment in that the load can come from any direction and the shaft can be held in place. automatically controlled by the cartridge valves 4. In the mounting step, when installing the roll on the bearing brackets 2, the cartridge valves 4 are arranged to be in the open position with the shaft 1 in its central position.

Claims (4)

1. Hydrostatically stored roller for a paper / cardboard or finishing machine, said storage having at least three around the axis (1) of the roller in the radial direction of the axis freely mountable hydraulically loadable bearing member (3, 5), characterized in that at least two of said bearing element (3) is always provided with a cartridge valve (4) mechanically engaged in said bearing element (3), which automatically compensates the load against said bearing element (3). Roll according to claim 1, characterized in that each of said bearing elements (3) is provided with a cartridge valve (4). Roll according to claim 1, characterized in that at least one of the remaining bearing elements (5) is loaded with a constant pressure hydraulic medium. Roll according to claim 3, characterized in that the bearing elements (3, 5) are in the number of at least four, of which at least two (3) are provided with the respective cartridge valve (4) and said bearing element (3) provided with said cartridge valve located on the same side in relation to the diameter of the shaft (1); and that at least two of the remaining bearing elements (5) are loaded with a constant pressure hydraulic medium and are located on the opposite side to the bearing elements (3) provided with a cartridge valve in relation to the diameter of the shaft (1). 25 * · «•« • ·