FI78945B - A process for switching a drying spinner from operating mode to threading mode and a device for the implementation of the process. - Google Patents

Abstract

A process and device for switching a drying spinner (20) from operating mode (A) to threading mode (B) for the duration of the threading and back. An identifier (30) and a steering device (32) for the edge of the drying spinner (20) are placed perpendicularly relative to the operating direction of the drying spinner (20) using a switching device (40), whereby the drying spinner is made to move from operating mode (A) to threading mode (B) and back. The device (15) includes an identifier (30) and a steering device (32) for the edge (21) of the drying spinner (20) as well as a device (40) for switching the drying spinner (20) from operating mode (A) to threading mode (B) and back.<IMAGE>

Description

78945 ^ A method of moving a drying wire from a driving position to a head position and a device for carrying out the method Förfarande för överföring av en torkningsvira fran körläge account spetsdragningsläge och anordning fc’r genomföring 5 av förfarandet

The invention relates to a method for deviating the drying wire from the normal position to the treatment side during the head removal.

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The invention also relates to a device for applying the method according to the invention for moving a drying wire controlled by cylinders and guide rollers from a driving position to a heading position during and after the main export, which device has a drying wire control member and a drying wire edge detection member.

The drying wire is used in the drying section of paper machines as a drying substrate for the paper web. The drying section is provided with drying cylinders and guide rollers through which, in the area of the single-wire outlet, the drying wire 20 or the felt passes, taking the paper web forward. Initially, the narrow headband of the paper web is guided to the drying section by means of blowing devices and a guide rope seat. The drying wire can also be used to support the paper web threading strip traveling ohjausköysistössä, if it can be moved in the direction of the service side for the duration of tail threading. Usually, there is a certain certain distance between the edge of the 25 wire and the guide rope to minimize wire and rope damage. The wire also usually has a guided movement (oscillation) on both sides of the center position, with an amplitude of about 20 mm and an oscillation time of several minutes.

transferring the drying wire 30 in the direction of the service side, various solutions have been used. In a known solution, the passage of the wire is controlled by controllers with an electromotive actuator. The mechanical part of the actuator consists of a robust casting housing, in the housing of which a carriage with two slide rails and an integrated trapezoidal threaded nut with molemir.in-35 side scrapers and a grease chamber are moved. The electric motor actuator consists of an AC short-circuit motor with a control starter, which is connected via a helical gear to a trapezoidal threaded spindle. The position sensor 2 78945 1 and the microswitches included in the terminal position delimitation are also located in the casting housing. The microprocessor control gets to know the position of the actuator via the precision-torsion resistors, which belong to the mechanic's sensors measuring the position of the wire.

5 Such a solution for moving the drying wire is relatively expensive and complicated.

In another known solution, the deflection of the drying wire is provided by means of a double valve control. In this known solution, control takes place by means of a double valve, so that the control function is transferred from one valve to another. These valves are staggered in the transverse direction of the paper machine by the desired travel. The movement of the drying wire by means of the double valve control is fast and stepped, 15 as a result of which it is also limited and causes vibration.

It is an object of the invention to provide improvements in previously known drying wire control methods and apparatus. It is a further object of the invention to provide a method and apparatus in which the transfer of the drying wire is smooth and in addition the transfer speed is adjustable, which is important in order to avoid overdriving the wire or felt following a rapid and / or gradual change of control pulse.

The objects of the invention are achieved by a method which is essentially characterized by what is set forth in the characterizing part of claim 1.

Other advantageous features of the method according to the invention are set out in claims 2-4.

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The device according to the invention, in turn, is mainly characterized by what is stated in the characterizing part of claim 5.

Other advantageous features of the device according to the invention are set out in claims 6-8.

Numerous significant advantages are achieved with the method and device according to the invention. The method according to the invention makes it possible to

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3,789,445 to provide a very cheap transfer method. In the method according to the invention, the control of the movement is easy because it is connected to the breakout machine of the machine. The length of the movement can be adjusted by means of the sensor 5 and, in addition, the normal flow of the drying wool can also be adjusted by means of the device according to the invention.

The invention will now be described in detail with reference to the figures of the accompanying drawings.

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Figure 1 shows the beginning of the drying section in which the drying wool transfer device is placed.

Figure 2 shows the running position of the drying wool.

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Figure 3 shows the head position of the drying wool.

Figure 4 shows the transfer device of the drying flow control valve.

Fig. 5a shows a side view of the hydraulic cylinder of the drying wool transfer apparatus.

Fig. 5b shows a top view of the hydraulic cylinder of the drying wire transfer apparatus.

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Figure 5c shows an end view of the hydraulic cylinder of the drying wool transfer apparatus.

Fig. 6 shows a hydraulic diagram of the drying shaft transfer mechanism.

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Figure 1 shows the location of the actuator 15 in the drying section of the paper machine, which comprises drying cylinders 1,2,3,4,5,6,7 and guide rollers 8,9,10,11, 12,13,14 and a drying wool 20 passing through them. 20 passages are controlled by guide rollers 8,9,10,11,12,13,14.

Figure 2 shows the position of the paper web 22 on the drying cloth 20 in the normal driving position A, whereby a safety gap is left between the edge 21 of the wire and the ropes 23,24 of the head thread. The main drive ropes 23,24 run from the drying cylinders 1,2,3,4,5,6,7 in a groove 25 on the treatment side of the paper machine.

Figure 3 shows the control of the paper 22 headband 26 with the head ropes 23,24 in the head position B. The drying wire 20 is moved to support the paper 22 headband 26, whereby the distance between the wire edge 21 and the head ropes 23,24 is less than said. distance in position A.

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Fig. 4 shows an actuator 15 for moving the drying wire, where the location of the edge 21 of the drying wire 20 is detected by a sensor 30 which is a mechanical lever which controls the throttle of the control valve 32 and thus also the control pressure of the wire control system 15 acting on the guide roller and the control valve 32. The sensor member 30 is connected to the control valve 32 by means of a lever 31. Connected to the control valve 32 is a rod 34, which is also attached to the fixing member 33, to which is also attached a rod 35, which is connected to the transfer device 40.

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The axes of the rods 34 and 35 are perpendicular to each other so that the axis of the rod 34 is parallel to the drying cylinders 1,2,3,4,5,6,7 and perpendicular to the direction of travel of the drying wire 20, and the axis of the rod 35 is vertically perpendicular to the direction of travel of the drying wire 20. in relation to the

Figures 5a, b and c show a drying wire transfer apparatus 40 connected to other parts of the actuator 15 via a rod 35.

The rod 35 passes through the backing plate 41 of the transfer device 40 and is secured by a mounting portion 42 to the transfer device 40. The mounting portion 42 is on a slider 43 attached to the piston rod of the hydraulic cylinder 46 which is attached to the transfer device 40 body 47 surrounded by a cover 43. an adjusting screw 44 and a locking nut 45 are attached to limit the stroke length of the hydraulic cylinder 35.

Fig. 6 shows a hydraulic diagram of the transfer apparatus AO comprising a pressure line 60 and a return line 61. The pressure line 60 first has a ball valve 56, followed by a throttle 53 through which pressure is directed to the pressure relief valve 52, after which the line branches in two directions. terminates in a manometer 55 and the other branches into two lines, one of which passes through a 4/2-way valve to the hydraulic cylinder 40 and thence through a 4/2-way valve 51 to the throttle body 58, from which a return line 61 passes through the ball valve 57. One of the branch lines passes to the auxiliary safety valve 59, which joins the return line 61 before the ball valve 57.

The invention has been described above with reference to only one preferred embodiment thereof. However, this is not intended to limit the invention in any way, but as will be apparent to those skilled in the art, many modifications are possible within the scope of the inventive idea defined by the following claims.

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Claims (9)

A method for moving a drying wire (20) from a driving position (A) to a head export position (B) during and after a head export, characterized in that the sensor member (30) and the guide member (32) of the edge (21) of the drying wire (20) are positioned on the drying wire (20). transverse to the direction of travel by means of the transfer device (40) and thus the drying wire (20) is guided to move from the driving position (A) to the head removal position (B) and back. 10 1 Claims A method according to claim 1, characterized in that the control pulse of the intermittent automation of the paper machine causes the transfer of the transfer device (40), which causes the transfer of the transport wire (20) via the control device (32) and the sensor member (30). 15 Method according to Claim 1 or 2, characterized in that the drying wire (20) is also guided in the area between the driving position (A) and the head-export position (B). Method according to one of Claims 1 to 3, characterized in that the sensor element (30) is moved slowly, preferably by 20 to 100 mm / min, and preferably evenly by the desired distance, preferably by 40 to 100 mm. Apparatus for applying the method according to any one of claims 1 to 3 for moving the drying wire (20) controlled by the cylinders (1-7) and the guide rollers (8,9,10,11,12,14) from the driving position (A) to the heading position (B) during the main export, and back, the device comprising a control member (32) of the drying wire (20) and in connection therewith a sensor member (30) of the edge 30 (21) of the drying wire (20), characterized in that the device (15) comprises a transfer device (40) with said control member (32) with the sensor member (30) is movable in the transverse direction to guide the drying wire (20) to move from the driving position (A) to the head position (B) and back. Device according to Claim 5, characterized in that the device (15) comprises a transfer device (40) which is connected by means of a rod (35) to a fastening element (33) which is connected to the control device (32) by means of a rod (34). ) to which a sensor member (30) for connecting the drying wire (20) in a direction transverse to the direction of travel of the drying wire (20) is connected by means of an arm (31) or the like. 5 6,78945 Device according to Claim 5 or 6, characterized in that the device is connected to the operating equipment of the paper machine and its control to the interruption automation of the paper machine. Device according to one of Claims 5 to 7, characterized in that the sensor element (30) and the control device (32) are arranged to control the travel of the drying wire (20) substantially transversely to the direction of travel, Device according to one of Claims 5 to 8, characterized in that the device is adapted to control the passage of the drying wire (20) also in the area between or outside the driving position (A) and the heading position (B). 20 25 30 35 8 78945 Ί Patentkrav