FI70949B - STYRARRANGEMANG FOER SLUTEN VAEVNADSSLINGA I PAPPERSMASKIN - Google Patents

Description

70949

Paper machine closed tissue loop control arrangement Styrarrangemang för sluten vävnadsslinga i pappersmaskin

The invention relates to a guide arrangement for a closed fabric loop of a paper machine, comprising a guide roll over which a laterally guided fabric, such as a wire or felt, is guided and whose guide roll shaft support members are arranged on transfer devices by means of which the guide roll axis can be pivoted laterally. comprising means for sensing the position of the tissue edge and providing a control signal to the control system, the support devices of the axes of both ends of the guide roller being supported on pneumatic bellows devices 10 by deflecting the guide edge .

It is previously known to provide a paper machine wire or felt silk 15 to guide laterally a guide roller that is tiltable in a plane substantially parallel to the wire or felt in place to guide the laterally displaced wire or felt into place. Most commonly used are control devices in which the position of the second side edge of the wire / felt is sensed by a pneumatic control valve 20, the control signal of which controls a pneumatic actuator, usually a bellows device, connected to the bearing brackets of the second shaft pin of said guide roller. This bellows device rotates the axial direction of the guide roller in a direction 25 correcting the lateral position of the wire / felt. The bearing bracket of the second shaft pin of the guide roller is arranged to be moved, e.g. by a screw motor, which is usually controlled by manual control so that after the corrective movement of the automatic control device, the return movement of the other end of the guide roller is performed manually. As an example of this known arrangement, reference is made to the 30 SE patent 200,727.

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In addition, with respect to the prior art related to the invention, reference is made to U.S. Patent 2,709,588, which discloses a felt / wire lateral guide system in which one end of a guide roller is connected to a pneumatic actuator cylinder and the other end to a screw motor, both devices simultaneously rotating the guide roller. / in the direction correcting the lateral position of the felt. This known device is complex in structure and may exhibit stability problems and does not have manual adjustment capabilities.

The object of the present invention is to provide a system for adjusting the lateral position of a wire or felt which is simple and reliable in operation, which is fully automatic and in which certain practically important advantages, both structural and functional, are realized.

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In order to achieve these and later objects, the invention is mainly characterized in that the end of the guide roller opposite to the above-mentioned end is arranged to be deflected by the second bellows device in the opposite direction to the deflection direction of the second end with a certain delay and / or substantially slower than the first bellows.

In the control system according to the invention, the automatic control range is doubled, e.g. with respect to the control system known from the above-mentioned SE patent 200 727, because the manual control of the other end of the guide roller has been changed to a corresponding automatic control. This also has the advantage that no lines from the control panel are required on the return side of the roll, as is the case with manual control. The advantage of this is that a more secure control is obtained, and the wool / blanket 30 cannot go aside because the operator has not noticed in time to perform a manual reset. The pivoting movement at the ends of the guide roller is halved, which puts less strain on the wires / blankets.

In the following, the invention will be described in detail with reference to some embodiments of the invention shown in the figures of the accompanying drawing.

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Figure 1 schematically shows a top view of a flat horizontal guide of the invention.

Figure 2 shows a vertical guide according to the invention seen in the machine direction.

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The structure and operation of the horizontal guide according to Fig. 1 is as follows.

The guide roller 10 of the wire or felt W is supported on both of its shaft pins 11 by supports 12 on pairs of pneumatic bellows 20A, 20C and 20B, 20D. A constant pressure is connected to the counter-beams 20C and 20D via lines 19. Instead of counter-beams 20C and 20D, other springs operating in an equivalent manner can be provided. A supply pressure Pj »which is e.g. Pj = 2 x P ^ is connected to the control valve 22, which senses the position of the felt / wire W. The throttle valve 15 adjusts the amount of air on the bellows 20A such that when the control valve 22 sensing the position 15 of the edge Wu of the felt / wire W opens and closes, the speed of movement of the roll 10 is the same in both directions. Felt / wire W efforts tending side HP, for example, the control valve 22 is closed and the pressure increases in the bellows 20A, causing the guide roller 10 HP-side end of the displacement in the direction of the arrow F, until the felt / wire W 20 move the tending side HP ceases. The throttle valve 16 is only slightly open, so that the bellows 20A due to the increased pressure of the air flow with a certain delay opposite to the bellows 20B, the guide roll 10 of the drive side KP head moves to the direction of the arrow F in the opposite direction. In this case, the felt / wire W is transferred back to the used-25 downside to the POI feet and the control valve 22 of the bellows 20A of the pressure by reducing the transfer guide roller 10 of tending side HP head back concen-kiasentoa feet until an equilibrium condition in which the felt / wire W is is centered, is achieved.

To prevent control oscillation and ensure stability, the throttle valve 16 is adjusted only slightly slightly so that the travel time of the bellows 20B from one extreme position to another is at least about five times as long as the bellows 20A moving with the same pressure change provided by the control valve 22.

The structure and operation of the bar guide shown in Fig. 2 are shown below. Because the vertical guide has a vakiopainepalkeiden 20B, 20C or the 35 70 949 respective springs in place of the force of gravity acting on the guide roller 10 at both ends in the same direction, the effect of the feedback pressure of the drive side KP bellows 20B 'are arranged in reverse, so that the roll 10, both ends of the switch to the opposite directions of the same control-5 under the effect of pressure. Inverse operation is provided by a special reversing relay 24, the output pressure P, of which decreases the control pressure 1; ...

P, increasing so that P. = k, x ——. The supply pressure P ^ = V.2 x after the soot reduction valve 23 5 4 1 P5 where k ^ and are the coefficients of proportionality.

The control pressure P1 of the reversing relay 24 is taken through the throttle valve 26 from the operating pressure of the bellows 20A '. The operating pressure of the bellows 20A 'is controlled by a control valve 22 sensing the position of the edge Wu of the felt / wire W as described above. The pressure on the bellows 20A 'is taken through the throttle-15 valve 25. The throttle valve 25 corresponds to the throttle valve 15 of Figure 1. The throttle valve 26 of Figure 2, in turn, corresponds to the throttle valve 16 of Figure 1 and these valves 16; 26 provide a transfer delay at one end of the guide roller 10 as described above. The pipe through which the pressure is applied to the control valve 22, 20 is denoted by the reference number 21. The reversing relay 24 is a commercially available component known per se, instead of which another corresponding component or control arrangement can also be used in the invention. Felt / wire drive-side edge of the POI is indicated by W ^.

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In Figures 1 and 2, components 13, 14 and 23 are pressure relief valves for reducing the inlet pressure P1 to suitable operating pressures P1, P2 and P3. 30. According to Fig. 1, the bellows devices 20B and 20D are schematically connected to a carriage 30, which in turn is e.g. 31 arranged to be moved on the basis of manual control. This arrangement is not necessary, but it makes it possible to use the controller according to the invention in exceptional cases, as in the case of previously known devices 35, based on manual control.

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The horizontal guide shown in Fig. 1 is suitable for use, for example, in controlling the pick-up felt and the third felt press felt of the applicant's "Sym-Press" (TM) press section. The horizontal guide shown in Fig. 1 can also be used, for example, with a forming or drying wire of a paper machine.

5 The vertical guide shown in Fig. 2 is suitable, for example, as a guide for the lower felt of the first press nip of the "Sym-Press" press part.

The following are claims within the scope of which the various details of the invention may vary within the scope of the inventive idea.

Claims (9)

1. Controlled arrangement for closed tissue 1 paper machine, each arrangement comprising a guide roller (10) over which Mr led a 1 sideways 5 scatable tissue, si as a wire or flit (W), and the support means (12) on the shafts (11) of this guide roller (10) supported by conveyors (20), by means of each of the guide roller (10) rotaton shaft, can be reversed by displacement of the tissue moving over this axis (W), and to which control arrangement belongs means (21, 22), with the aid of each one is informed of the position of the edge (W) of the tissue (W) and gives a control signal to the control system and the supporting means (12) of the shafts (H) to bid on this guide roller (10). blower bellows (20A.20B, 20C, 20D; 20A ', 20B'), not having the aid of the blower bellows (20A, 20A *) provided at the base of that of the sensing member (22) on the edge of the tissue (Wp) The smooth guide rail deflects one end of the guide roller (10) in a direction which corresponds to the position of the tissue (W), characterized in that control the alsene (10) method 1 extending to said end is arranged to be deflected by another blower device (20B; 20B *) 1 opposite direction 1 extending to the other end's deflection direction 20 with a certain delay and / or substantially longitudinal beam. make the bellows (20A; 20A '). 1 Patent claim Control arrangement according to claim 1, characterized in that the movement of said second bellows (20B; 20B *) from one outer position to the other is at least about 5 times as much as the movement of the first bellows (20A; 20A '). ) with a rolling pulse of the guide roller (22). 3. Control arrangement according to claim 1 or 2, which is intended for control of a tissue (W) such as a pick-up and / or a press field of a press member, which tissue mainly runs horizontally on the guide roller (10), and on which the shafts Supporting members (12) on the guide rollers (10) both ends are vertically supported on bids by a pair of pneumatic blast bellows devices (20A, 20C and 20D, 20B) and said second bellows (20A.20B) of said blower bellows act as shaft support means. (12) conveying control bellows and the other bellows (20C, 20D) or corresponding spring means act as the motor means, characterized in that said bellows pairs are arranged so that said first control bellows (20A) move the shaft support means (20). 12) in one end of the roller (10) at the base of the pressure regulated by the control valve (22) in a direction of rotation which corresponds to the same position of the tissue (F), the second control bellows (20B) in the opposite supporting means (12) of the roller moves the other 5 the support means (1 2) 1 opposite direction with a deliberate delay or with a considerably lower speed of movement (Fig. 1). Control arrangement according to claim 3, characterized in that a selected feed pressure (2) has been supplied to the first control bellows (20A) via the throttle valve (15) and the pressure on the first bellows (20A) is arranged to be controlled by said pneumatic control valve (22) and said regulated pressure has been applied to the second control bellows (20B) p! opposite the sealing of the vale via a noticeably strangled valve (16), and to both the counter bellows (20C.20D) has led to the same pressure (Pp, 15 which is considerably lower than the former mentioned feed pressure (Pj). Control arrangement according to claim 4, characterized in that the feed pressure (Pj) of the control bellows (20A.20B) is about 2 times as large as said feed pressure (P P) high against the bellows (20C, 20D). 20 Control arrangement according to claim 3, 4 or 5, characterized in that both said feed pressures (Pj, Pj) have been coupled from the same initial pressure (P P) via different pressure lowering valves (13,14) (Fig. 1). 25 Steering arrangement according to Claim 1 or 2, which is intended for guiding a substantially vertically extending web (W) over the guide roller (10), characterized in that the supporting members (12) of the shafts (11) at both ends of the guide roller (10) are below supported by bellows 30 (20A1, 20B1), which are loaded with gravity only and that a gauge pressure (P P) has been supplied via the throttle valve (25) to the first control bellows (20A '), which is controlled by the pneumatic control valve (22). probing the edge of the tissue (W) and controlling the swivel relay (24) of the throttle valve (26) or other corresponding control device with said regulated pressure, through which a pressure (P 2) is applied to a second control bellows (20B ') to produce the pressure. of the first bellows (20A ') e.g. increases the pressure on the second bellows (20B ') with a lateral delay and vice versa (Fig. 2). Il