FI105497B - Arrangement and method for feeding hydraulic medium to various parts of a bending compensated roller - Google Patents

Description

105497 Arrangements for supplying hydraulic medium to a deflection compensated roll

The invention relates to an arrangement and a method for supplying hydraulic medium 5 to deflection compensated rolls, in particular to its adjustable zones which can be loaded as hydraulic medium.

The deflection compensated roll comprises a stationary shaft and a roll jacket rotatably arranged therewith having at least one longitudinally adjustable hydraulic-loadable adjustment zone for adjusting the distribution of the nip force between the roll and the nip forming the nip therewith. The control zone may include one or more loading elements, to which the hydraulic medium at the pressure required for the control is fed by zone through the media channels formed in the stationary shaft. There may be one or more zones, typically the number of zones is about 8, but when the zones consist of individual load elements, the number of zones may be as high as 60.

In prior art deflection compensated nip rolls, the loading pressure required by the adjustment zones 20 is supplied to the roll by long tubing and hoses • · · '. * ·: And by means of quick couplings. The system also requires a separate valve cabinet, in which • · t: the hydraulic oil is pumped from the tank and where the control valves required for each control zone are installed. The valve cabinet is placed • · · • · *; ·; * quite far from the roll. Handling the load pressure supply from the valve cabinet to • · 'f. / 25 with long hoses separately for each control zone will result in pressure loss.

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In addition, the number of hoses to be applied to the shaft is large, especially when the adjustment zones are formed by individual load elements, causing handling problems in the assembly and various maintenance stages, and weakening • · · · · - - - -.

safety in the factory environment. With the roll the nip forming the counter roll <I ... · -: The load pressure supply of the V 30 control zones is handled by their own valves and I <· ---- - hoses, which further increases the number of hoses and the disadvantages it brings,:. '· But can also cause power imbalances between pressure nip :: nip, which can become significant leading to overload.

2 105497 This, in turn, causes a local deformation of the other roll, which causes tension and, in the worst case, breaks the roll.

Fl application 980270 discloses a solution for introducing hydraulic fluid hoses 5 neatly into a valve roller. This facilitates the export of hoses from the machine to the roll, but does not solve the problem of pressure drop.

U.S. Patent 4,291,446 discloses a prior art arrangement for supplying hydraulic means to control zones using a valve block 10 connected to a roll shaft. One problem with this is the relatively troublesome attachment and removal of the block from the shaft, provided that, in addition to closing the hydraulic fluid supply, the channels are emptied before the block is removed.

It is an object of the present invention to provide an improved system and method for supplying hydraulic medium to a roll, particularly to its adjustment zones. It is another object of the invention to provide an improved system and method for supplying hydraulic medium to the alignment zones of the roll and its counter roll.

To achieve the objects of the invention, an arrangement according to a first aspect of the invention for supplying a hydraulic medium to a deflection compensated roll comprising a stationary shaft and a rotatable roll casing having at least one longitudinal hydraulic medium * · A loadable adjusting zone for adjusting the distribution of the nip force between the roll and the nip forming the nip with the nip, the arrangement comprising a hydraulic medium pressure line for introducing the hydraulic medium to the roll and the valves connected to the feed line • · * for at least one control zone, characterized in that the arrangement comprises a single • Il \ single thrust line and that the valves associated with the thrust line are integrated in a separate • · ·: V 30 valve block connected to the roll shaft substantially immediately • »· * ··· 'with a quick coupling arrangement comprising a first block portion V * j followed by a valve block for said at least one: control zone flow channel and a counterpart arranged in an axially endless flow channel 3 105497 , to establish a flow connection between the respective flow channels of the block and the axis.

An arrangement for feeding a hydraulic medium to a deflection compensated roll according to another aspect of the invention, the roll comprising a stationary shaft and a roll jacket rotatable therewith having at least one longitudinally adjustable hydraulic-loadable adjusting zone for engaging the roll respectively, the counter roll has at least one adjusting zone aligned with the corresponding roll adjusting zone, the arrangement comprising a hydraulic fluid pressure line for supplying the hydraulic fluid to the roll and the pressure line valves (16 for controlling the hydraulic medium to the different adjusting zones; the respective control zones of the opposing roll forming the respective roller have a common control valve, which control valves are arranged directly on the roll shaft or integrated in a separate valve block which is connected to the roll shaft substantially immediately.

A method of feeding hydraulic fluid according to the invention to deflection commands. 'i retired roll with roller having stationary axis and around it «« f .. ...

:: 'rotatable roll casing with at least one longitudinal hydraulic I «f ------------' '* medium-load adjustable zone for adjusting the roll • · _.

and a nip between the nip between the nip and the counter roll in which the hydraulic medium is introduced by a hydraulic fluid pressure line into the roll and guided by the valves associated with the feed line to the at least one control zone of the roll, characterized in that the method uses a separate valve block • · · arranged said valves, which valve block is connected to the end of the roll shaft • · · - -.....

• · · *. a coupling arrangement comprising a first coupling portion arranged in said at least one control channel of the valve block 30 and a counterpart arranged at the end of the shaft in a flow channel associated with the same control zone, which are arranged in an air-tight and leak-free manner. a flow connection between the block and shaft respective flow channels 4 105497, and that the hydraulic medium is introduced along a single pressure line to a valve block connected to the roll and controlled by said valves arranged in said at least one control zone of the roll.

A method for feeding a hydraulic medium to a deflection compensated roll according to another aspect of the invention, the roll comprising a stationary shaft and a roll jacket rotatable therewith having at least one longitudinally adjustable hydraulic fluid-loaded adjusting zone for at least a nip between the roll and its counter roll. one adjusting zone aligned with the corresponding adjusting zone of the roll, wherein the method of introducing the hydraulic medium into the roll at the hydraulic medium supply space and guiding the at the necessary hy a drill medium through a common control valve, which control valve is arranged directly on the roll shaft or integrated in a separate valve block which is connected to the roll shaft substantially immediately.

In the following, the invention will be described in more detail with reference to the accompanying drawings, in which: Figure 1 shows an example of a hydraulic fluid supply system currently in use. Fig. 2 schematically illustrates an exemplary embodiment of the invention, Figs. 3a, 3b. illustrate a quick coupling arrangement for the embodiment of Fig. 2 for attaching a valve block to a roll shaft.

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Fig. 4 illustrates an arrangement according to another aspect of the invention for supplying a hydraulic medium to a roll and a nip forming roll with it.

Fig. 1 schematically illustrates a hydraulic fluid delivery arrangement for a deflection compensated roller 1 currently in use. The roller 1 comprises a roller sheath 3 rotatably arranged around bearings 5 by means of bearings 5. The roller sheath is divided into adjusting zones Zt Z ^, e.g., 1-10, typically 8. Each adjusting zone comprises a plurality of loading elements 4 which provide a roll-over belt. The loading elements 4 are connected by connecting channels 12,13 to the hydraulic fluid supply line Zr Zn associated with each zone. The hydraulic medium pressure to be fed to the feed lines is controlled by the control valves 9,10 on each feed line located in a separate valve cabinet 60 shown by 15 dashed lines in Figure 1. The control valves further guide the via connecting channels 12, 13. The valve cabinet is typically also equipped with control valves for other applications, such as bearing lubricating oil. Hydraulic medium 20 from tank 6 is introduced into the valve cabinet by means of pump 7 via pipeline 8. Return oil from roller 1 • * · Ύ: guided back through pipe 11 to tank 6. The zone adjustment can also be carried out so that each load element 4 forms its own "control zone", whereby the number of control zones can be e.g. up to 60. The deflection roll of the deflection compensated roll may be e.g. a long nip roll, a rigid sheath roll, a suction roll or another similar deflection compensated roll.

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Figure 2 shows a hydraulic medium supply according to the invention along one single supply line 15 to a shaft of the roll to which the shaft is connected by a substantially • · · Y valve valve assembly with integrated I «(Y; '30 required valves such as control valves). 16 and fittings 17 connected to the valves 16 • f '*;', from which the hydraulic medium can be fed, if necessary, to the respective control zones of the counterflow II · v.

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Figures 3a and 3b illustrate one quick coupling arrangement for attaching valve block 20 to shaft 2. The quick connector consists of a connector portion 30 attached to valve block 20 and a counterpart 40 attached to the end of shaft 2. bore and includes a body portion 38 having a piston 31 loaded with a spring 32 having a shaft 31a guided in a tubular portion 39 attached to the bottom portion of the body 38.

A flow space 35 is formed inside the body 38 which communicates with the channel 33 through an opening 34 in the bottom of the body member.

The counterpart 40 formed at the end of the shaft 2 includes a body 41 in the shaft, fixed to a bore formed in the bore formed by the same channel 33, which is connected to the corresponding adjustment zone 15 and which has a fixed stop 42 around the body. a longitudinally adjustable spring member 44 is provided with a spring 44 which is engageable with a conical inner surface of the stop 42. The inner flow space 36 of the body 41 is connected to the inner shaft passage 37 through the flow openings 50.

Fig. 3a shows a situation in which the valve block 20 is fixed to the shaft 2 by means of a quick coupling II (30,40), whereby the body 30 of the coupling 30 is connected to each other by the connector 30 and the counterpart 40. the member 38 has moved the closing member 43 against the force of the spring 44 k · · 25 against the inner conical surface of the stop 42 and the corresponding member 42 has moved the piston member 31 against the force of the spring 32 inwardly at the connector 30, are connected to each other by supplying line 15 through the valve block to channel 33 through valves 16 • · «The hydraulic fluid supplied is hated from channel 33 through opening 34 through spaces 35 and 30, and further through opening 50 into shaft 37 and further I f '·; 1' e.g. in the control zone z „.

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In Fig. 3b, the valve block 20 is disengaged from the shaft 2, whereby the piston 31, when loaded by a spring 32, has closed the flow space 35 of the connector 30 and the movable closing member 43 of the counterpart 40 is positioned against the conical inner surface of the stop 42.

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The quick coupling according to the invention provides a leak-free and air-tight closure of the flow channels 33,37. A further advantage of this solution is that the valves contained in the valve block 20 can be tested against the connectors 30 with the block disengaged from the shaft, thereby avoiding the pressure of the entire roll 10 for testing purposes. The mechanical locking of the block 20 on the shaft 2 can be implemented, for example, by means of bolts.

Figure 4 shows the deflection compensated roller 1 and its deflection compensated counter roll 100. The counter roll sheath 103 may be a metal or composite material 15 or it may be an elastic hose sheath (so-called long nip press roll). The rollers 1 and 100 are supported by roller or sliding bearings 5 and 105. The load elements of roll 1 are designated by reference numeral 4 and the load elements of roll 100 by reference numeral 104. The load elements 4 and 104 are located substantially opposite to each other on the nip. They do not have to be identical in structure, but they must have the same pressure areas. The figure shows that each «·:. 'i load element 4 or 104 is an independent zone Ζ, .Ζ,' ..., but equally • ·: each zone Z1, Z2 ...; Z1 ', Z2' ... in each roll could be formed more •. ..

• «f * · | · * of the element. With respect to the opposing multi-shoe zones, it is true that the individual loading elements in the zone are aligned with the corresponding loading elements in the 25 reel roll zones and that the pressure areas in the zone are more equal to nip molar. .

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The hydraulic medium entering all zones is introduced along a single pressure line 15 • · · either directly on the shaft 2 of the roller 1 or on the valve block 20 connected to the shaft 2 of the I · · '·' 30 substantially immediately, e.g. by a quick coupling arrangement 30, 40. for each zone Z1 of the roller 1 (Z2 ... and for each of · · v: zone Z1, Z2 '... of roller 100, so that the same load pressure is applied to m «* ·.' ·: opposite zones Ζλ and Z, ', Z2 and Z2 'etc. along the pressure lines ζλ, ζ2 ....

8 105497

The pressure of the hydraulic medium in the feed line can be, for example, in the order of about 120 bar. The pressure hoses z1tz2 ... can be neatly introduced from the valve block 20 into the shaft 200 of the roll 100 by e.g. power imbalance substantially eliminated.

The roller 1 may also have a counter zone 10cz acting in the opposite direction of the nip and comprising a row (s) of load elements 160. Usually the counter-zone Cz is single-zone, whereby all of its load elements 160 are supplied with the same pressure, but this too can be nip-profiling, e.g.

3-zone. It is also possible to integrate the valves of the counter-zone (s) Cz into the valve block 20.

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The hydraulic fluid required for other applications, such as bearings and gearboxes, can be brought to the roll in conventional manner via separate tubes or hoses. Preferably, however, all the hydraulic medium required for the roller is supplied along a single pressure line 15 to a block 20 connected to the roller shaft 2, and then guided 20 through, e.g. . For example, when the bearings 5 are plain bearings, the hydraulic medium they require can be either delivered directly to the bearing bracket or to the shaft or along a line · · *; ·. Also, a control valve for counter-zone Y · 25 Cz can be connected to block 20. This solution avoids the use of a separate valve cabinet and the export of several long hoses to the shaft.

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Claims (10)

1. Arrangement for feeding hydraulic medium to a bend-compensated roller, said roller having a stationary shaft (2) and a roller sheath arranged around the rotatably with at least one longitudinal adjustable zone with hydraulic medium (Z 2 - Z 2), with by means of which the distribution of the nip force between the roll (1) and with the support roll forming a roll nip can be controlled, which arrangement comprises a pressure line (15) for the hydraulic medium for conveying the hydraulic medium to the roller and valves (16,17) connected to control the hydraulic medium for said at least one feeding zone, characterized in that the arrangement comprises a single pressure line (15) and the valves (16, 17) connected to the pressure line are integrated in a separate valve block (20) connected to the axis of the roller ( 2) substantially immediately with a quick-coupling system comprising a flow channel 15 (33) connected to the feeding block (20) of the valve block (20) mentioned at least one control zone. The first coupling part (30) and at the end of the shaft, in the flow channel (37) connected to the same control zone, a counterpart (40), which is adaptable to each other air-free and leak-free, to form a flow connection between the corresponding flow channels of the block and the shaft. 2. Arrangement according to claim 1, characterized in that the coupling part • If v: (30) has a sealing member (38) externally sealingly mounted on the channel (20) (38), the inner part of which forms a flow space (35) for the hydraulic medium, which • space (35) is closable with an internal loadable by a spring member (32) • piston (31) for the body part (38) where the valve block (20) is released from the shaft, and the counter piece (40) comprises a body part (41) arranged in the channel (37) corresponding to the shaft (2), the inside of which forms a flow space (36) for the hydraulic medium, in which the body (1) (41) is arranged internally in relation to the body part stationary shoulder (42) and outside the body part (41) have been arranged longitudinally by means of a spring means (44) slidable hollow shutter member (43), which shoulder (42) and shutter member (43) can be provided. brought together with said spring means (44) to t stop; '; : the flow space (36) where the block (20) is released from the shaft. • · _ • I • «« 14 10F497 3. Arrangement according to claim 1 or 2, characterized in that a counter zone (Cz) acting in the opposite direction of the nip (Cz) acting in the valve (20) is arranged in the opposite direction of the nip. 4. Arrangement according to claim 3, characterized in that the counter zone (C2) consists of several longitudinally arranged control zones, which respectively have at least one load element (160). 5. Arrangement according to claim 1 or 2, characterized in that the control / control valves of the other applications are arranged in the valve block therefor. 6. Arrangement for feeding hydraulic medium to a bend-compensated roller, said roller having a stationary shaft (2) and a rotatably arranged roller sheath with at least one longitudinal adjustable zone with hydraulic medium (Z <| ... Zn), with by means of which the distribution of the nip force between the roll (1) and with the support roll (100) forming a roll nip can be controlled, which counter roll (100) p correspondingly exhibits at least one control zone (ZV-Z'n) opposite the roll (1) corresponding to control zone, which arrangement comprises a pressure line (15) t *. 20 for the hydraulic medium to convey the hydraulic medium to the roller (1) and to the feed line: valves (16,17) join to guide the hydraulic medium to different control zones, characterized in that the pressure lines (15) are only one, and that the roller (1) and • · · · ... · with the counter-roll (100) forming a roller nip respectively and between each other for control zones (Z, ... Zn; Z (... Zn) ') and respectively have a common control valve, which control valves (16, 17) are arranged directly on the shaft (2) of the roller or integrated in a separate valve block (20) connected to the »» · • * * ··· (shaft (2) of the roller substantially immediately) • · • * * • · Arrangement according to claim 6, characterized in that the valve block (20) fit: ..,: 30 is connected to the axis (20) of the roller (2) with a quick-coupling system (30, 40). • I s "": A method of feeding hydraulic medium to a bend-compensated roller, said roller having a stationary shaft (2) and a rotatably arranged roller sheath (3) having at least one longitudinal hydraulic medium loadable control zone (Ζ,. Ζ ,,), by means of which the line load in the roll nip between the roll (1) and its supporting roll is controlled, in which method the hydraulic medium is measured via the pressure line (15) of the hydraulic medium to the roll and is guided with the valves (16) connected to the feed line. 17) into said at least one control zone of the roller, characterized in that a separate valve block (20) is used in the method, in which said valves (16, 19) are provided, which valve block is connected to the end of the roller shaft (2) with a coupling system , which consists of a flow channel (33) arranged in a at least one control zone (Z, ... Zn), connected to the first coupling part (30) and one at the end of the shaft in a til flow zone connecting channel (37) arranged counterpart (40) which is adapted to each other air-free and leak-free to form a flow connection between the block (20) and the shaft (2) respective flow channels, and that the hydraulic medium is led along a single pressure line (15). the valve block connected to the roller and controlled to the said roller at least one control zone with valves (16,17) arranged in the valve block (20). Method for feeding hydraulic medium to a bending compensated roller, said roller having a stationary shaft (2) and a rotating roller sheath (3) having at least one longitudinal hydraulic medium loadable control zone j (Zi -.- ZJ, by means of by which the line load in the roll nip between the roll (1) and its support roll (100) is controlled, in which method the hydraulic medium is measured via the hydraulic pressure line (15) to the roll and is guided with the feed line connected to the feed line. 16, 17) to the said roller at least one control zone, characterized in that in the process the hydraulic medium is guided via a single feed line (15) to the roller (1), that in the method the tiles are measured between each other located opposite each other. the control zones (Z, ... Z ^, Z / ... Z, /) on opposing sides of the roller nip between the roller ··· (1) and its support roller (100) the required hydraulic medium via a common control ··· * clay valve (16), which control valve is arranged directly on the shaft (2) of the roller (1) or is integrated into a separate valve block (20) which is connected to the shaft (1) shaft (2) substantially immediately. 4 «--------------. f ««> 4 f The method according to claim 9, characterized in that the valve block (20) is coupled to the axis (2) of the roller (1) with a quick coupling system (30, 40).