DD201815A5 - ARRANGEMENT FOR ADJUSTING OR BZW. ADJUSTMENT OF THE BLADE EDITING UNIT IN MACHINES, ESPECIALLY ROUND DISPLACEMENT MACHINES - Google Patents

Abstract

The invention relates to an arrangement for adjusting or adjusting the sheet forming unit in machines, in particular rotary screening machines and is applicable in machines for producing nonwoven fabric from a stock suspension. Between a former element and a tiltable back wall, the sheet forming zone lies with the exit slit. It should be created a backlash-free and precisely working Verstellmoeglichkeit for the outlet gap, wherein after a tilting of the back wall, without lengthy adjustments, the existing before the tilting outflow gap should be achieved again. The back wall is supported for this purpose with the interposition of an adjusting device to a fixed stop and is held by the Betetigungsvorrichtung for the tilting movement of the back wall in contact with the ortdfesten stop.

Description

7 3 3 ~ ¹ ~ ^{59 39} ° ²⁸

AP D 21 P / 231 373/3

Berlin, 18. 9. 81

Arrangement for adjusting or ₀ setting of the sheet forming unit in machines, in particular cylinder machines

Field of application of the invention

The invention relates to an arrangement for adjusting or adjusting the sheet forming unit in machines, in particular round screening machines, for producing a nonwoven fabric from a stock suspension.

Characteristic of the known technical solutions

By DE-AS 25 37 079 an adjusting device for the sheet forming unit in fourdrinier machines has been known in which the rear wall of the sheet forming zone is pivotable about a horizontal axis, wherein the coarse adjustment of the exit slit unspecified pivoting means are provided. At the lower edge of the front side of the rear wall, a cover strip is arranged, by means of which displacement by means of adjusting spindles in the vertical direction, the fine adjustment of the size and geometry of the exit gap is made from the sheet forming zone. The various adjustment do not work without clearance, so that the accuracy of the gap and maintaining its size is not guaranteed.

By CH-PS 564 639 was an arrangement for adjusting or adjusting the sheet forming unit in machines, in particular round screening machines, for producing a nonwoven from

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a pulp suspension which can be supplied to a sheet forming zone, which is formed on the one hand by a portion of the upper surface of a permeable former element, for example a screen and, on the other hand, by this surface section opposite power supply walls of a preferably tiltable rear wall movable away from the former element The rear wall is arranged transversely to the direction of movement of the former, wherein an actuating device, which can be acted upon in particular by a pressure medium, is provided for moving, preferably tilting, the rear wall The current-carrying walls are subdivided into individual segments, which are arranged so as to be adjacent to one another transversely to the direction of movement of the former element its position to the surface of the former element are adjusted. The adjustment is very complicated and requires after the tilting of the rear wall in each case a renewed adjustment of the segments.

ν ../ The CH-PS 56 46 40 shows for a machine according to the aforementioned CH-PS 564 639 an adjustability of the size of the outlet gap over the entire machine width. For this purpose, 56 46 40 adjusting rods are provided in the machine according to the CH-PS, which extend over the entire machine width and at which each of the adjusting devices is mounted for the segments of the current-carrying walls. By moving the adjusting rod in its longitudinal direction all adjusting devices are simultaneously adjusted by the same amount and thus the outlet gap in each case by the same amount over the entire width of the machine .verstellt. In these, on the individual adjustment devices the outlet gap changing facilities makes the inevitable game between the individual control elements unpleasant.

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It should be noted here that the gap width deviations must not exceed 0.1 mm. In addition, it also requires.in this device an adjustment of the exit slit as soon as the back wall has been tilted away once. -

Object of the invention

The aim of the invention is an arrangement for adjustment .bzw. To develop adjustment of the sheet forming unit, which does not occur in the occurrence of plaits and "blockages tearing the fleece and the reliability of the arrangement is increased while reducing the cost of adjusting or adjusting the sheet forming unit.

Explanation of the essence of the invention

The invention is based on the object, an arrangement for adjusting or adjusting the sheet forming unit in machines, in particular rotary screening machines for producing a web from a stock suspension, which is fed to a sheet forming zone, on the one hand by a portion of the surface of a permeable former element, such as a Sieves and on the other hand from this surface portion opposite Stromführungswänden a moveable away from the former, preferably tiltable rear wall is formed, whose tilting axis is arranged transversely to the direction of movement of the former, wherein one, in particular acted upon by a pressure medium actuator for moving, preferably tilting, the rear wall is provided to create, whose adjustment for the outlet gap clearance and thus extremely accurate and the same gap width in the sheet forming zone after a change of the forming element in a simple? / eise sichergestel lt can be.

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According to the invention the object is achieved in that the rear wall is supported with the interposition of an adjusting device, preferably lockable adjusting screws on a stationary stop, which is optionally arranged on the frame of the former unit and that the actuator of the rear wall holds them in abutment against the stationary stop.

The arrangement of the adjusting device between the rear wall and a fixed stop the adjustment of the discharge gap is achieved without the need to act separately on each segment of the Stroraführungswände to make it more or less to the former by the same amount. By taking place by means of the actuator of the rear wall contact pressure of the rear wall construction of the fixed stop is always ensured even after a change of the former, in the case of a round screen after re-insertion of the screen, always the same gap width in the sheet forming zone. The arrangement also allows for a short-term, slight lifting of the rear wall in case of blockages or braid, without causing the fleece to break. It is achieved increased reliability and opens the possibility to drive smallest outlet gap widths; in conjunction with the arrangement of the stationary stop, against which the rear wall is pressed by means of the actuating device, the previously set Querschni-tt at the outlet gap is kept constant even after a brief lifting. ,

Furthermore, it is essential that the actuator of the rear wall is coupled with a monitor for the supply of the stock suspension, in the absence of the stock suspension (start and failure of promotion) the rear wall of the molding piece away, especially up to a Wegbewegung limiting, preferably adjustable stop

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controls. As a result of this configuration, damage to the forming element during startup of the machine due to impurities stored in the system or in the event of failure of the suspension feed is avoided by contact between the lip of the flow guide walls delimiting the outlet gap and the former element.

The occurring in case of failure of the suspension feed. Collapse of the negative pressure and the concomitant deformation of the former, which leads to a reduction of the exit gap, therefore - due to the automatically caused in such an operating condition movement of the rear wall of Pormerelement - to no destruction of the former element (for example, a round or wire). Due to the aforementioned embodiment of the arrangement, starting up with suspension is only possible with the rear wall moving away from the former and therefore enlarged exit gap, and the dirt particles or other possibly present in the stock line or fiber bundles disturbing the formation of sheets are already in front of them before closing the rear wall by hand washed away.

Another feature provides that the actuator of the rear wall is formed as a pressure medium, in particular compressed air acted upon Federbalgen, wherein in the supply line of the Federbalgens a switching valve is installed, whose control line is connected to the trained as a pressure monitor guards for the substance suspension supply. In this embodiment, the back wall is moved away from the molding blanket by interrupting the compressed air supply and quick exhaust of the bellows over the switching valve in case of failure of the stock suspension feed, whereby the exit gap is increased.

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The actuator of the rear wall is also used - which is known - for fast shutdown of the rear wall in a position in which the entire feed channel can be cleaned with the sheet forming zone with pressurized water.

In a further embodiment, the separator is located at the exit-side end of the sheet-forming zone in the region of influence of a suction box arranged there. In this arrangement, the measurement takes place at a particularly critical point of the sheet forming zone, whereby there can be detected and corrected immediately occurring defect.

In a further embodiment of the arrangement, the pivot bearing of the rear wall is arranged in the region of the end of the flow guide walls facing away from the exit slit of the sheet-forming zone. By this configuration, the movement is limited to that part of the sheet forming zone, which is necessarily exposed, with a slight swing already results in a relatively large broadening of the sheet forming zone. And enlargement of the exit slit.

To ensure that the arrangement undergoes no change in the gap widths in the sheet forming zone by thermal stresses in the rear wall even when driving with overflow is provided in a special embodiment of the arrangement that arranged on the current guide walls a known collection box for a possible overflow of the stock suspension By this configuration, even with overflow operation, the rear wall is not in contact with hot suspension, resulting in deformation of the rear wall and, subsequently, a change in the exact gap to be kept in the sheet forming space largely avoided.

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embodiment

The invention will be explained below with reference to an exemplary embodiment. In the accompanying drawings show:

Pig, 1: an arrangement according to the invention in section, for example on a Rundsiebmaschine;

Pig. 2: the arrangement according to the invention in a diagram in which only the parts essential for the understanding are entered;

Pig, 3: the arrangement according to the invention in a opposite Pig. 2 changed position, for example, for cleaning purposes of the sheet forming zone;

Pig. 4: in a pig. 2 and 3 corresponding representation, the situation when operating with overflow, and

Pig. FIG. 5 is a schematic illustration of the control of the system according to the invention. FIG.

A permeable Pormerelement 1, in the example a round screen, is arranged on the lateral surface of a cylinder provided with bores, which is acted upon only over a short part of the Zylinderurafanges with pulp suspension.

In the interior of the cylinder rotating in the direction of the arrow, suction boxes 2 with suction zones 2 of different sizes are installed in suction molds in operation under vacuum. A wedge-shaped sheet-forming zone 3 is bounded on the one hand by current-carrying walls 5, one Rückvjand 4 and on the other hand by a part of the lateral surface of the driven Pormerzylinders. The current-carrying walls 5 are approximately cylindrical

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curved. Over the width of the machine several Stroroführungswände 5 are arranged one behind the other. In the direction of the movement of the Formerelernentes 1 follow two current guide walls 5 to each other, which are connected by means of hinge and an associated axis 17 ά. The flow guide walls 5 are adjustable to change the inlet cross section in the sheet forming zone 3 by means of a Kurbelverstellvorrichtung, wherein the crank

^v -. Adjustment has a crankshaft 10 which is mounted in brackets 18 on the rear wall 4 and is connected via connecting rods 14, which are variable in length, with the current-carrying walls 5. The connecting rods 14 in this case engage with bearing blocks 19 of the axes 17 of the hinges. The adjustment of the inlet cross section of the sheet forming zone 3 over the machine width is carried out without significant change of the exit slit. The outlet gap must be set to constant width across the width of the machine. For this purpose, an adjusting spindle 15, which is located in the region of the exit-side end, is assigned to each pair of current-carrying walls 5 connected by an axis 17

/ -, the current-carrying wall 5 acts on this. To change the exit slit by a value that is constant over the machine width, the rear wall 4 as a whole is moved away from the former 1 or approximated to it. In the illustrated embodiment, the rear wall 4 is tiltably mounted about an axis B and supported with the interposition of an adjusting device formed by lockable adjusting 13 on a stationary stop 11. This stationary stop 11 is arranged on the frame, not shown, which carries the bearings of the screen cylinder. The adjusting screws 13 are mounted at the end of a console 12 of the rear wall 4. The exact adjustment of the width of the exit slit on the machine length is done by operating the adjusting screws 13, which - after the correct gap width is reached - by a Kontramutter or the like in

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their length are recorded. The rear wall 4 is held by an actuating device, which is formed in the illustrated embodiment by acted upon by compressed air bellows 9, in abutment against the stops 11.

By interrupting the Druckluftzuiührung to the bellows 9 and their quick exhaust, the entire rear wall 4 on the transversely to the machine arranged pivot bearing B due to their own weight, as desired and setting more or less far, tilted back, as in zurückgekippter position 16 in FIG 1 is shown by dotted lines and in Fig. 3 in more detail. The gesarate headbox, consisting of the rear wall 4 and a headbox beam 25 ₅ is pivoted for maintenance and general cleaning on a laterally arranged on the headbox beam 25 pivot bearing A by about 60 ° by means of compressed air motor and worm gear.

From Fig. 5 it can be seen that the actuator, formed by the bellows 9, the rear wall 4 is coupled to a guard 26 for the supply of the stock suspension, in the absence of the stock suspension, as at start-up and failure of a pump 27th Successful promotion of the stock suspension from a container 28 is the case, the rear wall 4 moves away from the former 1.

To limit the way a mounted on the cross member 25 stop 22 may be provided which cooperates with an adjustable arranged on the rear wall 4 counter-stop, which is formed in the illustrated embodiment of a screw 21. As soon as the screw 21 abuts against the stop 22, which is designed as an adjustable pin, the pivoting of the rear wall 4 about the pivoting

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camp B finished. The outlet gap was increased by this pivoting and any impurities can escape through the outlet gap, without the lip on the current-carrying wall 5 or even the delicate Formerelernent 1 is damaged.

In a supply line 29 of the actuator, a switching valve 30 is installed, wherein connected to the switching valve control line 31 is connected to the trained as a pressure monitor guard 26 for the stock suspension feed. The monitor 26 is located aia exit end of the sheet forming zone 3 in the area of influence of the suction box arranged there 2. If the supply of the stock suspension fails, the vacuum generated in the suction box 2 by a vacuum pump 32 breaks and the pressure monitor 26 delivers a pulse to the switching valve 30 , which moves the switching valve in a position in which the bellows 9 is vented.

The sheet forming zone 3 begins at the outlet end of a calming chamber 6 with this upstream tube bundle 20 and a parabolically tapered, transverse to the machine, lying manifold 8, which is fed by the pump 27 via a pipe network with water of fabric. The shaping element 1 facing the end of the settling chamber 6 is slightly conical and is formed by a clamped sealing lip 7 and by a straight flow guide wall, part of the headbox beam 25. The pivot bearing B of the rear wall 4 is arranged in the region of the exit slit of the sheet forming zone 3 facing away from the end of the current-carrying wall 5. As shown in FIG. 4, a collection box 23 for a possible overflow 24 of the stock suspension is arranged on the current-carrying walls 5. It is essential here that the collecting box 23 is spaced from other walls of the rear wall 4. The current-carrying wall 5 is

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in the region of their hinge bearings to facilitate their bending and adaptation to the desired shape of the sheet forming zone 3. , ·

Claims (6)

L ό IJ / ά Ο · / Ζ. 59 390 28 AP D 21 F / 231 373/3 Berlin, 18. 9. 81 invention claim 1. Arrangement for adjusting or adjustment of the sheet forming unit in machines, in particular rotary screening machines, for producing a web from a stock suspension which can be supplied to a Blauf forming zone, on the one hand by a portion of the surface of a permeable former element, such as a screen and on the other hand of this surface section opposite Stromführungswänden a wegbewegbaren from the former, preferably tiltable rear wall is formed, the tilting axis is arranged transversely to the direction of movement of the former, wherein one, in particular acted upon by a pressure medium actuating device for moving, preferably tilting, the rear wall is provided, characterized in that the rear wall (4 ) with the interposition of an adjusting device, preferably lockable adjusting screws (13), is supported on a stationary stop (11), which is optionally arranged on the frame of the former unit and that the actuating device of the rear wall (4) holds them in abutment against the stationary stop (11). 2. Arrangement, in particular according to item 1, characterized in that the actuating device of the rear wall (4) with a monitor (26) is coupled for the supply of the stock suspension, in the absence of the stock suspension (start and failure of promotion), the rear wall (4 ) away from the former element (1), in particular up to a travel limit limiting, preferably adjustable stop (22) controls. 3. Arrangement according to item 1 or 2, characterized in that the actuating device of the rear wall (4) as with a pressure medium, in particular with compressed air beauf- AP D 21 P / 231 373/3 Berlin, 18. 3. 81 malleable spring bellows (9) is formed, wherein in the supply line of the bellows (9) a switching valve (30) is installed, the control line (31.) is connected to the trained as a pressure monitor guard (26) for the stock suspension supply. 4. Arrangement according to item 2 or 3, characterized in that the guard (26) at the outlet end of the Bla.ttbildungszone (3) in the region of influence of a suction box arranged there (2). 5. Arrangement according to one of the items 1 to 4, characterized in that the pivot bearing (B) of the rear wall (4) in the region of the exit slit of the sheet forming zone (3) facing away from the end of the current-carrying walls (5) is arranged. 6. Arrangement according to one of the items 1 to 5, characterized in that on the current guide walls (5) a known collection box (23) for a possible overflow (24) of the stock suspension is arranged, of the remaining walls of the rear wall (4 ) is spaced. For this 4 pages drawings