DE6918965U - DEVICE FOR HEATING A STRIP-SHAPED PRODUCT. - Google Patents

Description

Device for heating a band-shaped Product

The innovation relates to a device for heating a strip-shaped product., Which has a heating surface is drawn, and in particular for the heating section for double-sided gluing in a machine for production by vvellpappe.

This part of the machine takes place when gluing together

eggs two sheets of paper with eggs etislltsn. ? SDi.er

tap, which together form the corrugated cardboard, heating takes place, by means of which the glueing together of the additions completely dries the cardboard at the same time. This heating is usually done by pulling the cardboard tape over a row of cast iron or steel heated, mostly steam-heated plates.

The pressing of the cardboard tape against the heating plates will caused by an endless cushion., whose lower strand rests on the cardboard tape. The pressure of the cushion against the cardboard is reinforced by loose hollows that seemed to hold in place or held freely movable by articulated rods

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that they rest on the cushion; this cushion distributes the roll weight almost evenly on the cardboard tape.

The length of such heating devices is calculated as follows., that at the maximum speed of the machine the duration, while the cardboard remains on the heating plates, sufficient heat exchange between the table and cardboard is sufficient. But if for some reason the speed has to be reduced, then we-n. the length of stay bigger and the heat exchange too big. Because of the thermal inertia of the hot plates, it is not possible to use the Disk temperature change as fast as the running speed of the cardboard tape changes.

It is also common practice to use the same machine Manufacture of corrugated cardboard with very different properties and compressive strengths. The weight of the press rollers is for making the heaviest and most resistant. Cardboard calculated and too big for light cardboard. One must therefore take out some caves, for example every second one; this way you can reduce the total pressure on the cardboard, but the local pressure of the individual lumps is wrong decrease in the same proportion.

The üSÄ-? 3 2 995 527 zsigt and describes a Sinrieh- trcc2g sos heating a band-shaped product, which is sucked over a heating surface, with which it is through a. endless upholstery held in contact i ^ ircL, soft burdened by equally distributed loose lumps; is, »jobei 3every role except dizreJh. yr Sigezige'iiJLeiit azieh uxnrsh. Mliiclesteiis a pressurized gas-fed servomotor is loaded iind the servomotors the!

6918365 ^ 5.71

that can be controlled by a servo motor., each , Pressure reducing valve feeds a group of servomotors., with soft actuation means and a control device for the automatic lifting of a belt are provided, by a rise in the door the VJelloaOpe critical drying temperature "in the event of an interruption of the conveyor belt. In accordance with the USA-PS 2 9 ^ l 573, the temperature control can be achieved by changing the belt speed and above stoves made by lowering a series of heating slats. Servomotors that au? the AnoreSrolls one Apply different pressure are known in this case Facility not available.

The task of the innovation is to remedy the difficulties mentioned and to be able to reduce the pressure of the hell on the cardboard immediately and constantly. The task is to change the heat exchange between the heating plates and the cardboard . can, without the need to change the temperature of the plates, to change the heat exchange depending on the speed of the cardboard belt by changing the pressure between the cardboard and the heating plates. can.

Dles <5 task is based on a facility according to of the USA-PS 2 993 527, renewal geinafi solved by the fact that the servo motor of each pressure reducing valve from a control device can be actuated both by the speed of the belt and by the position of the pressure reducing valve actuating servomotor is dependent.

In the drawing is a. Embodiment of the furnace shown. Show it:

', P

Fig. I in a simplified partial view are on both sides

Capable of * 2 slns

^? iS. 3 which simultaneously itir manual operation and itlr

j Control unit serving the servo motor; s

\ Hedusierventils for the supply of the servomotors;

$ Fig. 4 a funlctionsschei ^ a the operation of the

[: Servo motor for controlling a F.edu-

decorative valve for the supply of the control

I; Engines"

F The In? Ig. 1 crowned Helzelnrlchirang one

ι liellpappeninaschine v; elst a support frame on ^. that from longitudinal

I ordered beams 1 and supports 2 protruding from the floor.

; to the lines (shown below) for the Heisrslttel *

: z. B. Sasipr ^ attached sine.

'·. A strip of cardboard 4 "iilrd from a (not shown.,

i to the right of the picture to be thought of) pulling device in the sense of

I arrow 5 moves and rests on the hot plates 3.

S With 6 is a pad; this is a final

i loose bandj. whose other strand is not shown here; [

I the tape is at least as wide as the corrugated cardboard isand.

P "

I With 7 loose roles are designated. They are equally wide!

I I

I vile the upholstery or something wider than this; they are on |

S leather of your two E ^ de ^ t held in ie a rod 8 en., The

H I.

i ■ ί

K ί

1 I.

with 9 hinged to an auxiliary-LMngsbalken 10 is I.

In the corresponding part of the corrugated cardboard machine shown in FIG. ",;,., ■ _: ^ Pneumatic Stelliaotore 15 are with their cylinders at V ^r " V * on the longitudinal beam 14 land with their piston rods

- ^J ': .17 hinged to the rods 12, - Each servomotor is driven by

a flexible tube 18 from a common compressed air line

- - fed.

As Fig. 3 shows, .speist a pressure reducing valve 20 'is fed with compressed air through a line 21, seiner-' -, hand, air of controlled pressure in a to the actuators, leading distributor line a.. The control rod of the pressure reducing valve 20 is connected to a servomotor 22 of the pressure reducing valve via a gear 23, a ring gear 24, a ''' planetary gear external gear 25, planet gears 2.6, the central gear 27 of the planetary gear and gears 28 and 29.

The planet carrier 30 of the planetary gear is firmly connected to a shaft 31 for manual control, which carries a dial. The control shaft 3 ¹ - is connected to a locking device of a conventional type, not shown, by means of which the planet carrier 30 can be locked outside normal operation. A potentiometer 33 is mounted on the same shaft as the gear 28.

As shown in Fig. 4, the servo motor 22 is with the electric Network 40 connected by a switch 4l. A

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■ μ λ m * «;

Λ Λ X Λ Λ *

Motor 42 drives the corrugated cardboard belt; it is coupled to a Taehoineterdynaiüo 43, which generates an electrical voltage that is proportionally equivalent to the continuation of the cardboard tape.

The two voltages generated "by your Taehometerdynaino 43 and the potentiometer" are input into an electronic "Soannungsvergleiehsgerät 44". According to the sense of the difference between the two tensions, forgiveness gives; Bearing device 44 a signal which actuates the changeover switch 4i in one sense or the other, be it by means of an amplifier 4 $ and a Seiais -I _3, be it by means of an amplifier 6 and a relay 48.

In a machine so equipped, if the speed of the corrugated cardboard band s increases. that of the ■ speedometerdgmaiao 4j? generated voltage also increase and the comparison device 44 cause the servo motor 22 to the air pressure in the servomotors If? to increase until that Potentiometer 33 coupled to the servomotor, the voltage equilibrium «Made leather.

By increasing the air pressure in the servomotors 15, the pressing of the cardboard tape against the table is increased and the resulting additional heat transfer from the table to the cardboard balances the shortening of the Throughput time - this is the time that the cardboard tape needs to run across the table - out.

About differences in properties and resistance of the processed cardboard, one can determine the range of the ifoderunjen of the pressure in the servomotors 15 change using the manual control device. Using the

j Steiierevelle 5- lind the planetary gears 2δ can sau the pressure

\ change the compressed air gelled by the pressure reducing valve 20,

without changing the position of the potentiometer 55 ζ ~ ^α .

The explanation is not limited to the illustrated example. For example, the servomotors could also be arranged the other way around; Their pressing force would then be opposed to the weight of the halls. A faster run of the machine would then correspond to a reduction in the air pressure introduced into the servomotors, until it becomes lower at the fastest speed on the machine. One could also make the servo motors iiirlcsn some bestinsnte jmr rollers, however, one associated in the Drucl-czufuhrleitung Each Faires a roll servomotors disposing an electrically operated valve. The number of roles that are loaded in such a way by the action of the servomotors for years or less would be selected by hand using the switch. Or you could also use the number of more r. or less loaded roles can be changed automatically, ι indein nian the switches of the electrovalve by sine 3lock-

ver
disk selected curve run operated by a

Servomotor is driven, which is of the same type the pressure reducing valve controlling and to an equal, of the speed of the corrugated board-dependent control device connected.

You could also use double-acting servomotors, which are connected to electrical reversing valves; so one could an apparent one of the roles equipped with it give more or less weight than their real weight.

Claims (2)

SehutzansOruehs 1. Device for heating a belt-shaped product that is drawn over a heating surface, with which it is held in contact by an endless cushion, many loose rollers distributed in the same way, with each load being loaded. '"Ί _' role is loaded by at least one servomotor with compressed gas and the servomotors receive the gas via at least one pressure reducing valve ₃ so that it can be controlled by a servomotor. v; obei Each pressure reducing valve is a group of servomotors feeds ^ as characterized by that the servo motor {22} of each pressure reducing valve ^ 20) from one 'Steüereänrichtisiis can be actuated, which can be used by both the - the detriment of the band (4) as well as the position of the das Pressure relief valve (20) depending on the servomotor (22) actuating is. '■' 2. Device according to claim 1, characterized in that the control device consists of a device (44) comparing electrical voltages with one another, the eir, e first voltage of a tachometer dynamo (45) _} the speed corresponding to the speed of the 3andes (4) and a second voltage from a potentiometer (33) supplied '/ τ ± τά ₃ whose position depends on that of the servomotor (22) controlling the pressure reducing valve. 3 · Device according to claim 2, characterized in that each pressure reducing valve (20) a device (31, 52) for Has manual control that of the control of the servo motor (22) is independent, and that both controls can be used at the same time. ~. Means characterized, according to claim ₃ ,, I ös a Rolls the associated actuators (15) through a private that role to electrically. actuating valve can be controlled and that each of these electrical valves can be controlled by an electrical switch. 5. Device according to claim 4, characterized in that rä ±. & Elek ^ ischeöMS'cnal-iier ^ äer ^ Elekfeoventälel '^
Are cam actuated, the 'can be driven by a servomotor> cer ^Sii to "feine- • control means connected ist'j cie of the Geschy-ri ^ idi'gkeit of the tape _'m jS device according to claim 3, characterized in that' the setting motors and the double iiirksam electrovalves - "^ ÜR stetserventile slizd.