DE7517879U - AID DEVICE IN PAPER MACHINERY - Google Patents

Description

Lifting device in paper machine construction

The invention relates to a lifting device in paper machine construction for one in two stages via a pivot bearing of one Web or roller liftable device with an intermediate lift for business interruption and with a final withdrawal to Changing a felt, sieve or the like., In particular for one Uhle box or a pick-up roller for transferring a paper web from a set section to a subsequent press section. AufheIfvorrichtungen of this type are many in paper machine construction in action. A large area of application are Uhle box approvals or pick-up rollers. Uhle box removals or fuck-up rollers thereby have the purpose of producing before. Vacuum to transfer the paper web from the wire section to the press section. In the event of malfunctions in the paper machine, web breakage, etc., the suction tube removal or the pick-up roller is activated via a lifting device lifted by a certain amount with simultaneous removal of the vacuum. As a result, the web runs to the Gautschbruch-Hitte instead of to the press section. However, when the mushroom is changed, this lift-off is not sufficient. The Uhle box removal or the pick-up roller must be moved for this an additional, much larger amount can be lifted off.

Up to now, the relief has been done mechanically-electrically, e.g. via Motors, gears, worm shafts, actuators and limit switches. The main disadvantage was a transverse shaft that ran between the drive and the front end was necessary. In addition to the complexity of this device, an axially-sparing pressing of the Uhle box removal was required offer of the pick-up roller is not guaranteed. Thereby existed the risk of the sieve or the fungus running sideways.

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The invention is based on the object of a lifting device to create that is easy and safe to operate and with which an axially parallel pressing is possible.

According to the invention, this object is achieved in that one hydraulic cylinder is provided on the driver side and one on the drive side a piston rod is arranged, the piston rod via a first piston in an intermediate position and via a ring-shaped The second piston placed around the piston rod can be extended into an end position and the liftable one via a pivot lever Device operated accordingly.

The device according to the invention eliminates the need for separate drive motors, Gears, worm shafts. The liftable device can still always be lowered parallel to the axis. Also a transverse shaft may no longer be absolutely necessary. In addition, this aid device can react very quickly, which is often crucial to avoid destruction.

According to the invention, the hydraulic cylinder works in two stages. A first piston takes care of the lift-off for interruption of operation and a second piston enables a felt change. The piston rod actuates a pivot lever which carries out the lifting of the device into the desired position in the usual way .

Another area of application for the assisting device according to the invention is also found in size presses, hot smoothing units, double compact, triple and quadruple presses. There are always an or There are several rollers in contact with one another, which also have to lift off a certain amount quickly to interrupt operations, However, this dimension is not yet sufficient for changing felts or screens. The raising device is also for a screen drive roller usable.

In a further embodiment of the invention it is provided that the first piston arranged at one end of the piston rod at Pressure medium addition in its extended position for the intermediate position to the second, which is under counter pressure Piston strikes.

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According to the invention, the second piston thus forms a stop for the first piston, since the pressure of the second piston corresponds to the pressure of the first piston counteracts. For this purpose, it is only necessary to have either one in the pressure chamber for the second piston to give higher pressure or to make the effective piston area larger than that of the first piston.

Another inventive feature is that the first piston after removal of the counterpressure together with the second The piston can be extended to an end stop.

This measure enables the piston rod to be extended into the end position in a simple manner.

An exemplary embodiment of the invention is described below with reference to a drawing, from which further features according to the invention emerge.

Show it:

1 shows an overall view of a lifting device for a tube suction device in a basic representation;

2 shows a longitudinal section through the hydraulic cylinder according to the invention.

Between the wire section, of which only a suction roll 1 and a wire drive roll 2 are shown here, and the press section, which is represented here by two rollers 3 and ^ is located A Uhle box 5 · A paper web 6 (shown in dashed lines) of come free from the paper machine screen 7 and transferred to the press section adhering to a felt 8.

The Uhle box 5 is attached to a pivot lever 9. the The pivot lever 9 is mounted in a pivot point 10. Furthermore, a hydraulic cylinder 11 engages the pivot lever 9, via which the Uhle box 5 can be lifted in two stages.

In the event of a malfunction, e.g. if a web breaks, the hydraulic cylinder lifts the Uhle box 5 by about} 0 mm, whereby at the same time the vacuum is removed. As a result, the paper web 6 continues to adhere to the paper machine screen 7 and continues to run below in a not shown Gautschbruchbütte.

To change the paper machine screen 7 or the felt B However, this 30 mm lift-off is not sufficient. For this he must Uhle box 5 can be lifted to a considerably larger extent. These Two-stage lift-off takes place by the hydraulic cylinder 11, which is explained in more detail in FIG.

A piston rod 12 is arranged in the hydraulic cylinder 11, at one end of which there is a first piston 13 and a displacement 14 forms. A second piston 15 is annular around the piston rod 12 placed and between an attachment ring 16 of the hydraulic cylinder and a sealing part 17 which is longitudinally displaceable on the piston rod 12, forming a second displacement 18.

The hydraulic cylinder 11 is still provided with feed lines 19, 20 and 21 for the pressure medium and with corresponding derivatives 22, 23 and 24 provided. The associated shut-off valves are not shown. The piston rod 12 is fully retracted State drawn. I.e. the Uhle box 5 is for a sieve or Felt change completely lifted off. The restart now takes place in the following way:

1) Extend to intermediate stop.

The connections 19 and 21 are subjected to the same pressure. The piston rod 12 therefore extends up to 30 mm (stroke h,). As a result of the selected area ratios of the two pistons, the force acting on the movable second piston 15 is greater than on the first piston 13, so that the stroke 1 ^ _{1 is ended} after the first piston 13 hits the second piston 15. For this purpose, it is only necessary to make the piston area F _{2 of} the second piston 15 larger than the piston area F _{1 of} the first piston 13. Of course, it can

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can also achieve the same result if Fp is equal to or is even smaller than F. In this case it is just egg It is necessary to choose a higher pressure in the displacement 18.

As soon as the first piston Ijj rests on the second piston 15, takes place an alignment of the relief from the driver side to the drive side.

2) Extending the remaining stroke (for the operating status).

For this purpose, the pressure on the line 19 can be applied so that the stroke space 14 is still under pressure. In the displacement 18, however, the pressure is removed by opening the discharge line 24. The piston rod then extends the remaining stroke (hp) of J> 0 mm.

The reverse of the withdrawal works as follows: 35) Normal withdrawal:

To press the Uhle box 5 is located in the displacement 14 Pressure. When pressure is applied via the supply line 21 into the displacement 18 the piston rod 12 retracts to the intermediate position. This means that the train runs to the Gautschbruchbütte instead of the press section.

4) Quick withdrawal (in case of danger):

For this purpose, pressure is again given into the displacement 18 via the supply line 21. At the same time, however, the pressure is taken from the displacement 14 via the derivation. The withdrawal is therefore much faster than described under J>) "

5) Total start-up (for screen or felt changes when the machine is at a standstill):

Pressure is applied between the first piston and the second piston 15 via the supply line 20. At the same time, after the discharge line 22 has been opened, the pressure is removed from the displacement 14. The piston rod 12 then goes all the way in, putting it back into the position shown in the Figure 2 position.

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After a sieve or felt ball, the cubic capacity is 14 over the derivation 23 made pressureless and after pressure on the Feed line 21 moves the piston rod 12 forward again, as described under 1).

The description of the hydraulic cylinder has been given in general. The weight of the support must be used for a specific application and the additional parts are compensated for, i.e. the compensation pressure must be superimposed on the corresponding pressure. This consequently means that the pressure in the displacement 18 must be selected to be correspondingly higher than the pressure in the displacement. In addition, there may also be different pressures between the hydraulic cylinder on the Pührerseite and the on to choose the drive side. This depends on whether there are weight differences, e.g. due to pipes, suction heads etc., between Drive and Pührerseite are available.

When using the hydraulic cylinder 11 according to the invention for size presses, hot smoothing, double compact or triple and quadruple presses only takes the place of the Uhle box 5 the corresponding roller to be lifted off.

Heidenheim, May 30th, 1975

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Claims (1)

ap / P 3369 '" jM Voith GmbH \ J Password: "Step cylinder" Heidenheim / Brenz -Expectations 1. Lifting device in paper machine construction for a device that can be lifted off in two stages via a pivot bearing from a web or roller with an intermediate lift-off for interrupting operations and with a final lift-off for changing a felt, sieve or the like, especially for a tubular suction device or a pick-up -Roller for transferring a paper web from a wire section to a subsequent press section, characterized in that a hydraulic cylinder (11) with a piston rod (12) is arranged on the driver and on the drive side, the piston rod (12) via a first piston (13) is extendable into an intermediate position and a placed annularly around the piston rod (12) second piston (15) in an end position _s and thereby the lift-off device operated by a bchwenkhebel (9) (Uhle 5) accordingly. 2. Aufhelfvorrichtung according to claim 1, characterized in that that the first piston (13) arranged at one end of the piston rod (1,2) is in its extended position when pressure medium is added for the intermediate position to the under a counter pressure standing second piston (15) strikes. 3. Aufhelfvorrichtung according to claim 2, characterized in that that the first piston (13), after the counterpressure has been removed, continues together with the second piston (15) to an end position is extendable. Sdiutzonspr. 3 It. BI. I) deleted 15. ία τι ν Heidenheim, May 30th * 1975
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