DE1461224A1 - Schnellueft- and roller fine adjustment device for paper calendering - Google Patents

Description

^ U6T224

April 12, 1965

JOH. KLEINEWEFffiRS SONS, KREFEID

Patent and user auxiliary application

S chnel Air gap and Walzenfeineinsteileinrichtu ng fo r P r e api satellite i nlerkala Direction

With paper calenders it is necessary when tearing the paper web to move the rollers apart as suddenly as possible in order to damage the elastic rollers to prevent the wrinkles that occur when the paper is torn.

So far, this has been done by switching the pressure in the above double-acting pressure cylinders such that pressure is given from below and thus the whole set of rollers by means of the Lifting spindles attached to the pressure cylinders were raised until there was a gap of about 3-5 mm.

, ν ,. The previous method has the significant disadvantage that ^. the lifting of the entire set of rollers is very slow * "* goes up and can take up to 10 seconds because the calender hydrauo

^m lik or the buffering reserve of the hydraulic cylinders is not sufficient

to deliver. It is well known that in the large supercalenders the one for the roll ventilation of the roll set, which can weigh up to 50 t required pressure many times greater than the working pressure, which is sometimes measured to almost zero. It not only the hydraulics are switched to high pressure, but it must also start the pressure pump, since the pressure and liquid reserve at the beginning of the roll lifting the pressure bottles - which are not arbitrarily large due to lack of space can be measured - is used up immediately. This pumping under high pressure is therefore the cause of the slow Lifting the set of rollers.

Another disadvantage is that you are not able to use the existing equipment, the rollers only to be raised very minimally if stoppages occur as a result of roll changes or for other reasons, or if one Must drive through glue joints. In the event of a standstill or when passing through glued points or folds form on the Paper web as well as on the elastic rollers harmful ν print marks. So up to now you had to keep the rollers completely ventilate, separate the paper web and then let it start again.

According to the invention these drawbacks are eliminated by (J ₀ that the lifting cylinder acting now as Walzenlüftzylinder

co angeordoo in a manner known per se under the lowest roller

¹ ^ it is advisable that the lifting spindles or equivalent stops on the calender-ο stand, which limit the gap distances during roll ventilation, are fixed and that for roll ventilation for

hydraulic pull cylinders separate from the pressureless flow of goods

are arranged with lifting spindles with a small gap setting.

Reference is made to further features of the invention in the description of the exemplary embodiment shown in the drawing. In the drawing show:

Fig. 1 is a side view of a paper calender

and
Fig. 2 is a schematic representation of a front view

against the roller bearings of a calender side with the

two lifting spindles for full and for small

Roller ventilation.

As Fig. 1 shows, a paper calender consists essentially of the machine frame 1 shown in the lower part in longitudinal section, of a lowermost chilled cast iron roll 2, an uppermost chilled cast iron roll 3, the intermediate chilled cast iron rolls 4 and the elastic rolls 5. According to the invention the lowermost chilled cast iron roll (king roll) with its bearings 2 ¹ mounted in steering levers 6 which are rotatable about a pin 8 inside the hollow calender stand and which merge into extensions 7 on the front of the bearings. At the end of the extensions in pin 9 engage i ^{d e} piston of the roller release cylinders 10, which are movably mounted in the front part of the stand feet. This arrangement with extended Lenkco

<=> levering offers the advantage that the pressure cylinders are smaller ge-co

°° and can be held in the calender feet more easily

^ can be accommodated.
ο

Since the pressure is now applied by the roller

Lifting cylinder 10 takes place, the bearing housing 3 ^{T of} the top roller ^ are firmly connected to the calender stands.

The lifting spindle .. 11 with its stops 12 for limiting full roll lifting are firmly screwed by means of blocks 13 to the front guide surfaces of the calender stands in such a way that they pass through the hollow base of all roll bearings 5'-5 ^f in the middle of the bearing. Here, the adjusting nuts 12 are supported on sprues 14 within the bearing pedestal. Instead of a lifting spindle, adjustable stops which are known per se and can be screwed onto the guide strips of the stands can also be used.

To limit the fine adjustment of the rollers for the unpressurized passage of goods, a further lifting spindle 15 is arranged according to the invention, which expediently ^{moves upwards from a lifting cylinder 16 fixed to the uppermost roller bearing 3 f} for fine adjustment, on the other hand by venting the set of rollers during rapid ventilation the hydraulic fluid below the piston is released downwards. The lifting spindle 15 is guided on the outside next to the bearings in the drawing and engages with the adjusting nuts IJ under fork-like sprues 17 on all roller bearings.

Q In Fig. 2, the distance increasing from top to bottom is

oo the dimensions of the two spindles are given in mm. This shows-

¹ ^ lent that the lowering of the rollers when the goods are unpressurized

° run only for small amounts, which are calculated in such a way that

ο ■

O ₅ that although there are still contacts between the paper web and the rollers

ORiG.iNAL INSPECTED

exist, but no more pressure from the rollers the paper is exercised.

The roller lifting cylinder 10 and the lifting spindle cylinder 16 receive pressure fluid via hydraulic lines 21, the control being effected via remote-controlled electromagnetic three-way valves 19 and 20. When switching over the valves, the path is opened via drain lines 22 so that the pistons go down. The cross-sections of the discharge lines 22 of the roller lifting cylinders 10 are dimensioned in such a way that a slight buffering occurs when the pressure pistons are lowered. In addition, rubber buffers 2J> can be attached to the roller feet to support the lower roller ^{bearings 2!} be arranged.

The switching processes for rapid ventilation take place as follows. By hand or by photoelectric Scanning device 25 triggered magnetic contact switch all Solenoid valves 19 and 20 on the drain line. This results in the fastest lowering of the entire set of rollers, whereby the lowering is not limited by the fall of the lifting spindle 15. If, on the other hand, the calender should run without pressure are switched, a switch 26 with two opening and two closing contacts only the cylinder release cylinder Io lowered. Since the lifting spindle 15 for the Peinein-

Set the CD position in its highest position using adjusting nuts 18 .

to baren situation remains, the rollers lower only by the for oo

J ^ minimum amounts required for the unpressurized flow of goods.

ο The device according to the invention can, if necessary, cn

- ■ 6 -

also used for other calenders, e.g. textile calenders will.

It is also within the scope of the invention if the Peinteil lifting spindle 15 moves into the end position by a mechanical-electric drive.

Patent claims :

Claims (6)

Patent claims ; SchnellUft- and roller fine adjustment device on paper calendering calenders with hydraulic working pressure and roller lifting actuation, characterized in that the roller lifting cylinders (10) acting as pressure cylinders are arranged in a manner known per se under the lowest roller (2) that the gap distances at ' Lifting spindles (11) or equivalent stops on the calender stand (1) are fixed and that hydraulic pulling cylinders (16) with lifting spindles (15) with a small gap setting are arranged for the lifting of the rollers for the unpressurized movement of the goods. 2. Device according to claim 1, characterized in that the Feinstellhubspindeln (15) in their highest position limited by adjusting nuts (18). J, device according to claims 1 and 2, characterized in that the bearings (2 ^! ) Of the lowermost roller (2) are mounted in steering levers (6, 7) known per se. 4. Device according to claim 1 to J _3, characterized in that the steering lever; (6, 7) beyond the roller bearings co ° are extended forward and at their ends (9) the WaI-to - ^ attack zenlüftzyj-indians (10). * "* 5. Device according to claim 1 to 4, characterized in that ° * net that the cross section of the drain lines (21) so ORIGINAL INSPECTED H61224 dimensioned that the roller lifting cylinder (10) when lowering of the roller set (2-5) have a buffer effect. 6. Device according to claim 1 to 5 * characterized by such a circuit of the electrical control of the hydraulic switching valves (19, 2o) that when pressed the emergency button (24) or by triggering by means of a paper flow monitoring device (25) both the Roller release cylinder (10) as well as the lifting spindle cylinder (16) are vented while by actuating a pressureless switch (26) only the roller lifting cylinder. (10) is vented. 909822/0406