CN111941502A - Blade device and transverse cutting machine - Google Patents

Blade device and transverse cutting machine Download PDF

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Publication number
CN111941502A
CN111941502A CN202010401103.4A CN202010401103A CN111941502A CN 111941502 A CN111941502 A CN 111941502A CN 202010401103 A CN202010401103 A CN 202010401103A CN 111941502 A CN111941502 A CN 111941502A
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CN
China
Prior art keywords
cutting
blade
bar
cutting blade
roll
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010401103.4A
Other languages
Chinese (zh)
Inventor
A·基尔库
M·基乌鲁
K·拉姆斯戴德
T·里希迈基
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
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Valmet Technologies Oy
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Filing date
Publication date
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Publication of CN111941502A publication Critical patent/CN111941502A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
    • B26D1/34—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut
    • B26D1/38—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a fixed blade or other fixed member
    • B26D1/385—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis parallel to the line of cut and coacting with a fixed blade or other fixed member for thin material, e.g. for sheets, strips or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2628—Means for adjusting the position of the cutting member
    • B26D7/265—Journals, bearings or supports for positioning rollers or cylinders relatively to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/25—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member
    • B26D1/26—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut
    • B26D1/28—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut and rotating continuously in one direction during cutting
    • B26D1/285—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a non-circular cutting member moving about an axis substantially perpendicular to the line of cut and rotating continuously in one direction during cutting for thin material, e.g. for sheets, strips or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/0006—Means for guiding the cutter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2614—Means for mounting the cutting member
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2628—Means for adjusting the position of the cutting member
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/0033—Cutting members therefor assembled from multiple blades

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

In a blade apparatus in a cutting roller of a sheet cutter of a pulp dryer, the cutting roller including a roller shell recess including opposed surfaces for the blade apparatus and fastening elements for fastening the blade apparatus to the opposed surfaces of the cutting roller, the blade apparatus comprising: an elongated cutting blade for cutting the pulp sheet, adapted to be fastened in the recess of the cutting roll; an elongated bar adapted to support the cutting blade on the opposing surface, the bar including an opening for the fastener; a fastener including a head for fastening the bar to the opposite surface by means of the fastener through the opening in the bar; and an adjustment element for positioning the guide strip in a radial direction of the cutting roller. The guide bar comprises a longitudinal blade recess of the cutting blade, formed on the opposite side of the guide bar with respect to the head of each fastener, adapted to lock the cutting blade between the guide bar and the opposite surface by means of a friction lock.

Description

Blade device and transverse cutting machine
Technical Field
The present invention relates to a blade (blade) device (arrangement) in a cutting roll of a sheet cutter of a pulp dryer, the cutting roll comprising a roll shell recess (roll shell recess) comprising a counter surface (counter surface ) for the blade device and a first fastening member for fastening the blade device to the counter surface of the cutting roll, the blade device comprising:
-an elongated cutting blade for cutting pulp sheets, the elongated cutting blade being adapted to be fastened in a recess of a cutting roll;
-an elongated bar (guide strip) adapted to support the cutting blade against the opposite surface, the bar comprising an opening for the fastener;
-a fastener comprising a head for fastening the bar to the opposite surface by means of the fastener through an opening in the bar; and
an adjustment element for positioning the guide strip in a radial direction of the cutting roller.
The invention also relates to a transverse cutting device of a sheet cutter of a pulp dryer.
Background
In a pulp dryer, a fiber web is cut in its longitudinal and transverse directions using sheet cutters to form a pulp sheet. The transverse cutting device can be used for transverse cutting of the fibre web, wherein the cutting roll of the transverse cutting device cuts the fibre web while the cutting roll rotates, when the cutting blade comprised in the cutting roll coincides with the fibre web against the counter piece of the transverse cutting device. The cutting blade penetrates directly into the recess in the radial direction of the cutting roller, so that the cutting blade can be adjusted without being influenced by the guide bar. Depending on the properties of the fiber web to be cut, the cutting blade is either held at a distance from the counter-piece or is in contact with the counter-piece to cut a pulp sheet from the fiber web. The cutting blade is gradually worn and must be replaced in order to maintain a sufficient operational reliability of the transverse cutting device.
The prior art includes what is known as Valmet Cross CutterTMThe blade apparatus of a cutting roll of (1), comprising a bar, a cutting blade, adjustment elements for the bar and the cutting blade, and fasteners for fastening the bar and the cutting blade in recesses of a roll shell of the cutting roll. In such a roller apparatus, replacing the cutting blade requires removal of the fasteners, as each fastener penetrates both the bar and the cutting blade, which is located between the bar and the recess. After the cutting blade is replaced, the bar and the cutting blade must be precisely adjusted to the proper position to restore the cutting effect of the cutting roller. This is a laborious process requiring expertise, typically taking about 12 hours. Due to the longer duration, changing the cutting blade may be the most time consuming procedure in a service shutdown (service shutdown), extending the duration of the service shutdown and thus the downtime of the pulp dryer.
Another problem with the above prior art blade arrangement is that despite the high tightening torque of the fasteners, it is difficult to keep the cutting blade, which has been made of hard material to improve wear resistance, in place for a long time. The opening of the cutting blade must be larger than the diameter of the fastener so that the cutting blade can be adjusted relative to the guide bar. Such openings enable the cutting blade to move relative to the fastener at least in the radial direction of the cutting roller. Even if the fasteners are tightened to a great torque, the tightening of the fasteners gradually loosens due to the vibration of the cutting roll. In this case, the cutting blade can move relative to the bar, and the function of the cutting roller is impaired.
Disclosure of Invention
The object of the present invention is to achieve a blade apparatus which is more reliable and easier to replace than prior art blade apparatuses in terms of cutting blade replacement. Another object of the present invention is to achieve a cross cutting device that is more reliable and easier to replace than the cross cutting device of the sheet cutter of the pulp dryer of the prior art.
The object of the invention is achieved by means of a blade arrangement in a cutting roll of a sheet cutter of a pulp dryer, the cutting roll comprising a roll shell recess comprising an opposite surface for the blade arrangement and a first fastening member for fastening the blade arrangement to the opposite surface of the cutting roll. The blade apparatus includes: an elongated cutting blade for cutting the pulp sheet, the elongated cutting blade adapted to be fastened in the recess of the cutting roll; an elongated bar adapted to support the cutting blade against the opposing surface, the bar including an opening for the fastener; a fastener including a head for fastening the bar to the opposite surface by means of the fastener through an opening in the bar; and an adjusting element for positioning the guide strip in the radial direction of the cutting roller. The invention is characterized in that the bar comprises a longitudinal blade recess of the cutting blade, formed on the opposite side of the bar with respect to the head of each fastener, adapted to lock the cutting blade between the bar and the opposite surface by means of friction locking.
Due to the blade recess, the cutting blade can be locked by friction locking by using the guide bar to press the cutting blade against the opposite surface without using a fastener penetrating the cutting blade. Meanwhile, the bar may be directly supported to the opposite surface. In this case, the fastener need only be opened to remove the compression between the bar and the cutting blade when the cutting blade is replaced, in which case the cutting blade can be pulled out from between the bar and the opposite surface. When the cutting blade is mounted, only the position of the bar is readjusted, and the cutting blade resting on the bar is adjusted based on the bar. This both avoids separate adjustment of the bar and the cutting blade and saves a lot of time when mounting the cutting blade. Since the cutting blade is not adjusted separately, the adjustment of the cutting blade does not change when the cutting roller is used, as long as the position of the guide strip remains unchanged. The blade apparatus according to the invention also has a simpler structure than prior art blade apparatuses, which reduces the manufacturing costs. In the prior art, it has been a laborious process to make openings for fasteners in hard cutting blades. This process is now omitted.
Advantageously, the cutting blade is an imperforate (unperforated) piece. Such a piece is easier to manufacture from a hard material than prior art cutting blades that include holes.
Advantageously, the blade recess comprises a friction surface in the direction of the plane of the busbar adapted to support the cutting blade against the opposite surface and a bottom surface at an angle to the friction surface adapted to support the cutting blade in the direction of the plane of the busbar. This enables accurate positioning of the cutting blade in both the radial and tangential direction of the cutting roller by means of the positioning bar only.
Advantageously, the maximum diameter of each opening is between 120% and 300% of the diameter of the fastener to position the bar in the radial direction of the cutting roller. This enables the guide bar to be moved in the radial direction of the cutting roll while the fastener is held in place, which fastener is locked to the first fastener of the opposite surface, advantageously to the opposite thread.
According to one embodiment, each opening in the bar is a slot (slot) having a longitudinal direction in the radial direction of the cutting roller to position the bar in the radial direction of the roller. The slot also allows the guide bar to move in the radial direction of the cutting roll while the fastener remains in place and locked to the first fastener of the opposing surface.
According to one embodiment, the cutting blade comprises two support surfaces in the longitudinal direction of the cutting blade and two edge surfaces in the longitudinal direction of the cutting blade, which support surfaces are adapted to be arranged against the bar guide and the counter surface, each of the two edge surfaces having a blade edge, which edge surfaces are parallel, such that the cutting blade can be turned 180 ° around its longitudinal axis for changing the cutting blade edge. With a cutting blade equipped with two blade edges, the same cutting blade can be used twice as long before the cutting blade needs to be replaced. In the blade arrangement according to the invention, the cutting blade is advantageously not sharpened, but is replaced after both blade edges have become dull.
The cutting blade advantageously comprises two support surfaces in the longitudinal direction of the cutting blade, which are adapted to be placed against the bar guide and the opposite surface, and two edge surfaces of the cutting blade, which are uniform and continuous planes. In other words, the cutting blade does not include an opening or recess for fastening. In this case, the cutting blade can be easily manufactured, and a particularly hard material can be used in the manufacture.
Advantageously, the cutting blade extends radially from the centre point of the cutting roller a distance between 1mm and 5mm longer than the distance the guide bar extends radially from the centre point of the cutting roller. In this case, the cutting blade separates the cut pulp sheet from the blade device of the cutting roll, and the pulp sheet cannot adhere to the guide bar. In other words, a so-called "kick plate" is formed in the blade apparatus.
The adjusting elements are advantageously a plurality of adjusting bolts and a plurality of adjusting nuts movable thereon, which are adapted to be tightened against the recesses to achieve support of the guide bars in the radial direction of the cutting roller.
The roughness of the friction surface of the bar may be between 1.6 and 10Ra, advantageously between 3.2 and 7 Ra. By means of a sufficient roughness of the friction surface, the friction force required for a reliable frictional locking of the cutting blade in the radial direction of the cutting roller is achieved by a reasonable tightening torque of the fastener.
Advantageously, in the surface provided against the friction surface of the bar, the cutting blade has a surface roughness of 5Ra to 7 Ra. In friction locking, both the surface roughness of the bar and the surface roughness of the cutting blade are important so that the friction locking can be made reliable by reasonable tightening torque of the fastener.
The tightening torque of the fastener may be 250Nm to 330Nm, advantageously 270Nm to 300 Nm. The maximum tightening torque is determined by the yield limit of the fastener.
According to one embodiment, each edge surface of the cutting blade includes a bevel (level) forming the blade edge, and the guide bar includes a second opposite surface corresponding to the bevel to support the cutting blade in the radial direction of the roller. Due to the second bevel surface, a sufficiently large support surface is obtained between the bar and the cutting blade, so that the cutting blade can be firmly supported against the bar in the radial direction of the cutting roller.
The depth of the blade recess of the guide strip in the longitudinal direction of the adjusting element can be 2mm to 4mm, advantageously 3mm, less than the depth of the cutting blade in the longitudinal direction of the adjusting element. In this case, the cutting blade protrudes 2mm to 4mm more than the guide bar in the radial direction of the cutting roller, thereby preventing the fiber web from sticking to the guide bar when cutting the fiber web.
The object of the transverse cutting device according to the invention is achieved by a transverse cutting device of a sheet cutter of a pulp dryer, comprising a fixed counterpart and a rotating cutting roller. The cutting roller includes: a body comprising two ends; an adjustable bearing mount adapted at each end for adjusting the distance between the cutting roll and the counter piece; a roll shell adapted to surround the body, the roll shell comprising at least one recess for a blade apparatus and a first fastener for fastening the blade apparatus to an opposing surface comprised in the recess of the roll shell; and a blade device for cutting the fiber web into pulp sheets. The blade apparatus includes: an elongated cutting blade for cutting the pulp sheet, the elongated cutting blade adapted to be fastened in the recess of the cutting roll; an elongate bar adapted to support a cutting blade against an opposing surface, the bar including an opening for a fastener; a fastener including a head for fastening the bar to the opposite surface through the opening in each bar; and an adjusting element for positioning the guide strip in the radial direction of the cutting roller. The cutting device according to the invention is characterized in that the bar comprises a blade recess in the longitudinal direction of the cutting blade, which blade recess is formed on the side opposite the bar with respect to the head of the fastener, adapted to lock the cutting blade between the bar and the opposite surface by friction locking.
In addition to the advantages of the invention described above in relation to the blade device, the cutting device according to the invention achieves the following advantages: there is no need to adjust the position of the cutting blade relative to the bar to compensate for wear of the cutting blade. In the blade arrangement according to the invention, the wear of the cutting blades is compensated for by displacing the entire cutting roll relative to the counter-piece by means of a displaceable bearing block.
Each cutting blade advantageously comprises two blade devices fitted on opposite sides (disposal locations) of the cutting roller. This keeps the rotational speed of the cutting roller moderate.
The cutting roller advantageously comprises a second opposite thread in the radial direction of the cutting roller for fastening the adjustment element to the recess of the cutting roller.
The adjusting element can be fastened to the body of the roller by means of threaded holes. The guide bar can be pushed out by means of the smooth head of the bolt of the adjusting element. If it is desired to move the bar inwards, the fastening bolts are loosened and the bar is pushed inwards.
The blade arrangement according to the invention is suitable for use in a new pulp dryer as a transverse cutting arrangement according to the invention or for retrofitting into an existing pulp drying plant as a blade arrangement according to the invention. When retrofitted, the blade arrangement according to the invention replaces the blade arrangements of the prior art without modification of other surrounding structures or at most with minimal changes. It has been noted that, with the blade device and the transverse cutting means according to the invention, surprisingly, the cutting blades themselves do not need to be individually adjusted; instead, when the position between the bar and the cutting blade is kept constant, it is sufficient to adjust only the bar. In this case, the optimal position of the cutting blade can be adjusted mainly by adjusting the guide bar, while the rest of the adjustment comes from the adjustable bearing blocks of the cutting roller.
Drawings
The present invention is described in detail below with reference to the attached drawings showing some embodiments of the invention, wherein:
fig. 1 shows a layout image of a transverse cutting device of a sheet cutter of a pulp dryer according to the present invention;
fig. 2 shows a separate cutting roll with bearing housings, seen from the end, wherein the blade device according to the invention is part of a cutting roll;
fig. 3 shows an isometric view of a separate cutting roll without bearing blocks, viewed from the end, wherein the blade apparatus according to the invention is part of the cutting roll;
fig. 4 shows a separate cutting roll without bearing blocks, seen from the end, wherein the blade apparatus according to the invention is part of a cutting roll;
fig. 5 shows a cross-sectional view of an individual cutting roll as seen from the end, wherein the blade apparatus according to the invention is part of the cutting roll;
FIG. 6 shows the blade apparatus of FIG. 5 in cross-section and enlarged form;
fig. 7 shows the cutting blade of the blade device according to the invention separately seen from the end.
Detailed Description
According to fig. 1, the cross cutting device 11 and the blade arrangement 10 according to the invention are part of a pulp dryer 100. Fig. 1 shows only a part of a pulp dryer 100, more specifically a press section 110, a cutting section 112 and a slice section 114 of the dryer. In the pulp dryer 100, the fibrous web formed of cellulose pulp arrives as a uniform and full-width web onto a slitting machine 122 and the fibrous web is slit in its direction of travel, in other words, into a plurality of individual webs in the longitudinal direction. Thereafter, these parallel fiber webs are cut into pulp sheets in the cross direction using a cross cutting device 11 according to the invention. The pulp sheets are stacked in stacks (stacks) on the sheet portion 114. According to fig. 1, the transverse cutting device 11 according to the invention comprises the main components a rotary cutting roller 12 and a fixed counter-piece 104. The counterpart may be, for example, a counter blade beam (counter blade beam) equipped with a fixed blade or equivalent. A roll nip 118 before the cross cutting device 11 pushes the fibre web onto the cross cutting device 11, and a subsequent drive pulley 120 tensions the fibre web, which is cut by the cross cutting device 11. The rotary cutting drum 12 in turn comprises a blade device 10 according to the invention, most advantageously two blade devices 10 on opposite sides of the cutting drum 12, as shown in fig. 3-6. When the cutting roll 12 rotates, the blade device 10 coincides with the counter piece 104 at each rotation, in which case the fibrous web held between the blade device 10 and the counter piece 104 is cut in the cross direction of the web when they coincide with each other. The cutting may occur when the blade apparatus 10 is in contact with the opposing piece 104 or, more advantageously, when the blade apparatus 10 is sufficiently close to the opposing piece 104 without contact therebetween. The correct distance depends on the properties of the fibre web to be cut, such as grammage, stock and running speed.
The cutting roll 12 shown in fig. 1 is fastened to the frame 60 of the pulp dryer 100 by using the bearing housings of the cutting roll. Fig. 2 shows one of the bearing blocks 48. Each bearing block 48 of the cutting roll 12 may be bolted to the frame, for example, to lock the cutting roll 12 in place. Advantageously, each bearing seat 48 comprises an adjustment device (means)62 by means of which the distance of the blade device 10 from the counter-piece can be finely adjusted. The adjustment means 62 may be, for example, a trapezoidal screw with which an adjustment of 1/60mm can be achieved. The adjustment means may be completely similar to those used in prior art cutting rolls. Typically only five to ten percent of the adjustment is required, which is caused by wear of the cutting blade. Each bearing block may also include a gauge plate to indicate adjustment, with the eccentric indicating translation of the bearing.
Fig. 3 shows the cutting roller 12 of the transverse cutting device according to the invention in greater detail in isolation without bearing blocks. The cutting roll 12 comprises a body 44 and two ends 46, from which the cutting roll 12 is supported to the frame of the pulp dryer by means of bearing blocks. The cutting roll 12 comprises a roll shell 14 formed around the body, in which roll shell 14 a recess 16 for the blade apparatus 10 has been formed. The recess may be a structure cast into the roll shell or may be formed by fastening a separate fixing member (fastened piece) to the roll shell. The cutting roll 12 advantageously comprises two recesses 16 for the blade apparatus 10, which are located on opposite sides of the roll shell 14 of the cutting roll 12 with respect to each other. Although fig. 1 to 6 show that the transverse cutting device 11 comprises a cutting roller 12 with two blade arrangements 10, the cutting roller 12 of the transverse cutting device 11 according to the invention can also have 1 to 4 recesses and corresponding blade arrangements. Each recess advantageously comprises one counter surface 18 comprising fastening elements 21, in other words, the counter surface advantageously comprises counter threads 20 for locking each blade device 10 in each recess 16.
According to fig. 3 and 4, each blade device 10 comprises: an elongated cutting blade 22; an elongated bar 24 adapted to support the cutting blade 22 against the opposite surface 18; a fastener 28 adapted to be screwed into the opposing threads 20 shown in fig. 5 and 6 to secure the bar 24; and an adjusting element 32 connected to the bar 24 in the planar direction of the bar 24 for positioning the bar 24 against the recess 16 in the radial direction of the cutting roll 12.
According to fig. 6, the bar 24 comprises openings 26 for fasteners 28. The openings 26 are advantageously larger than the fasteners 28 at least in the radial direction of the cutting roll 12, so that the bar 24 can be moved relative to the fasteners 28 screwed into the opposing threads 20 of the opposing surface 18 for positioning the bar 24 in the radial direction of the cutting roll 12. The opening may be a slot-like circular opening. Advantageously, the maximum diameter of the opening is 150% to 300% of the diameter of the portion of the fastener 28 that passes into the opening 26. To this end, each fastener 28 includes a head 30 of larger diameter than the remainder of the fastener 28, the head 30 forming a support surface for the bar 24. Spacers 54 may be used between the fasteners 28 and the openings 26. The openings can be located on the conductor at a distance of 50mm to 200mm, advantageously 80mm to 130mm, from one another, in which case a secure locking of the conductor is achieved. In this regard, it should be understood that only a portion of the openings 26 and fasteners 28 of the conductors are shown in FIG. 3, but in practice there are evenly spaced openings and fasteners throughout the distance of the conductors, similar to the fastening elements formed in the recesses for the fasteners.
According to fig. 6, the bar 24 comprises a blade recess 34 in the longitudinal direction of the cutting blade 22 for locking the cutting blade 22 between the bar 24 and the counter surface 18 by means of a friction lock. An insert recess 34 has been formed in the bar 24 on the side opposite the bar 24 relative to the head 30 of each fastener 28, in other words, the insert recess is mounted on the side of the opposite surface 18 of the bar 24. In this way, an empty space is left between the bar 24 and the opposite surface 18, in which the cutting blade 22 is mounted. Advantageously, according to fig. 6, the blade recess 34 comprises a friction surface 36 in the planar direction of the bar 24 and a bottom surface 38 for supporting the cutting blade 22. The friction surface 36 supports the cutting blade 22 in a perpendicular direction relative to the plane of the opposing surface 18, in other words in a tangential direction of the cutting blade, while the bottom surface 38 supports the cutting blade in a radial direction of the cutting roller 12. When the bar 24 is tightened into the counter thread 20 of the counter surface 18 with sufficient torque of the fastener, the bar presses the cutting blade 22 against the counter surface 18 with such a force that, together with the friction between the counter surface 18, the bar 24 and the cutting blade 22, a locking friction of the cutting blade 22 is also achieved in the radial direction of the cutting roller 12.
Advantageously, the bar 24 is a piece made of two or more parts. In this case, the guide bar 24 is easy to transport and install. Advantageously, the bar comprises two or more portions, each portion having a length of between 500mm and 1000 mm.
The cutting blade may be a part made of one or more pieces. Advantageously, if the width of the cutting roller is greater than 5m, the cutting blade is made of one or more parts that are at most 5m long. On the other hand, in the blade apparatus according to the present invention, no opening or recess for fastening is formed in the cutting blade, which is why the machinability of the powdered steel does not pose a problem. As shown in fig. 7, the cutting blade 22 advantageously comprises two support surfaces 41 adapted to be mounted against the bar 24 and the opposite surface 18, and two edge surfaces 40. Each edge surface 40 includes a bevel forming a blade edge 42 and the gib 24 includes a second opposing surface corresponding to the bevel for supporting the cutting blade in the radial direction of the roller. Since the symmetrical shape of the cutting blade is achieved by two blade edges 42 and parallel edge surfaces 40, the cutting blade 22 can be rotated 180 ° with respect to its longitudinal axis so that both blade edges 42 are utilized before the cutting blade is replaced.
In the blade apparatus according to the present invention, if the blade apparatus of the present invention is used in an existing cutting roll instead of the prior art blade apparatus, the depth of the cutting blade in the radial direction of the cutting roll may be 20mm to 30 mm. On the other hand, if the blade apparatus according to the present invention is used in a new roll, the depth of the cutting blade may be 30mm to 40mm in this case. When using a deeper cutting blade, the cutting blade has more friction surface for fastening.
The guide strip 24 is supported in the recess 16 of the roller shell 14 of the cutting roller 12 in the radial direction of the cutting roller 12 by means of an adjusting element 32 as shown in fig. 5 and 6. The adjustment element 32 is advantageously an adjustment nut 72 which is adapted to a thread 74 on the adjustment bolt 70. The adjustment bolt 70 is rotatable into the second opposing thread 52 in the radial direction of the cutting roll 12. The adjusting nut 72 is seated (seat) against the recess 16, forming a second support surface by means of which the bar 24 is supported in the recess of the cutting roll 12 in the radial direction of the cutting roll 12. Even if the second support surface does not have a large surface area, it is sufficient because the forces acting on the guide strip are directed such that the force in the tangential direction of the cutting roll is about 10 times the force in the radial direction of the cutting roll.
By means of the adjusting element 32, the protrusion of the bar 24 in the radial direction of the cutting roller 12 can be adjusted, while also the position of the cutting blade 22 in the radial direction of the cutting roller 12 can be adjusted. In other words, when the positioning between the bar and the cutting blade is fixed, the positioning of the cutting blade 22 in the radial direction of the cutting roller 12 is done only by moving the bar. By means of the adjusting screw 70 serving as the adjusting element 32 and by means of the adjusting nut 72 adapted to the thread on the adjusting screw, the guide strip 24 is positioned by turning the adjusting nut 72, in which case the guide strip supported against the adjusting screw in the radial direction of the cutting roll 12 is moved radially outwards or inwards. Advantageously, there are several adjusting elements at regular intervals for achieving a firm support. The adjustment element 32 may be fastened to the body of the cutting roll 12 by means of threaded holes.
Advantageously, the recesses formed in the cutting roller and the opposite surfaces, the cutting blades and the guide bars have a slightly helical (spiral) shape in the longitudinal direction between the ends of the cutting roller. In other words, they have a twist (twist) and a pitch (pitch) between the two ends. This means that at one end of the cutting roll the plane of the guide bar points in a slightly different direction perpendicular to the surface of the roll shell of the cutting roll than at the other end of the cutting roll. Due to the spiral shape, when the blade device of the cutting roll coincides with the counter-piece while the cutting roll is rotating, the cutting of the fibrous web takes place at slightly different times at different ends of the cutting roll, just like a scissors cut. The spiral shape is also disclosed by the cross-sections of fig. 5 and 6.
In order to ensure sufficient friction to lock the cutting blade between the bar and the counter surface, the counter surface and the friction surface of the bar are advantageously machined to a suitable smoothness for achieving sufficient friction in the radial direction of the cutting roller by tightening the fastener. The roughness of the friction surface of the bar and of the friction surface of the counter surface may be between 1.6 and 10Ra, advantageously between 3.2 and 7 Ra. Advantageously, the surface roughness of the cutting blade in the surface that is placed against the friction surface of the bar is between 5 and 7 Ra. Due to the machined surface, no separate shoulder (shoulder) or groove (groove) is required in the friction surface and the cutting blade to achieve sufficient friction. In other words, the sides of the cutting blade are straight, these sides being in the direction of the plane of the friction surface of the bar and the friction surface of the counter surface.
The material used for the cutting blade is advantageously powder steel, but may also be high chromium steel. Powder steels are more expensive than high chromium steels, but also more durable. The manufacturing costs of the cutting blades are much less than the costs that arise when the pulp dryer is in a standstill state, which is why the cutting blades are preferably of a more durable material in order to extend the interval between service stops. The bar and the opposite surface may be, for example, un-quenched tool steel or similar material.
The mounting and replacement of the blade arrangement and the transverse cutting device according to the invention takes place in the following stages. When installing the cutting blade, the bar is first secured against the opposing surface by installing a fastener through an opening in the bar and by tightening the fastener only to the securing element, thereby retaining the bar in the recess. After this, the bearing blocks of the cutting roller are adjusted to a zero position (starting position). The cutting blade is mounted between the bar and the opposite surface and the fastener is tightened to a torque of 50 Nm. The cutting roll is rotated so that the blade arrangement is placed against the counter-piece, in which case the need for blade adjustment can be seen. The adjusting element is used to adjust the position of the bar and the cutting blade relative to the counter piece to make them suitable by turning an adjusting nut that serves as the adjusting element. Finally, the fastener is tightened to its final tightening torque to lock the cutting blade. The tightening torque can reach 250 Nm-330 Nm. When the cutting blade is replaced, the fasteners are sequentially loosened without completely removing them from the opposing threads, in which case the cutting blade may be rotated to use a new blade edge, or may be completely replaced, after which the installation process described above is repeated.

Claims (5)

1. A blade apparatus (10) in a cutting roll (12) of a sheet cutter of a pulp dryer (100), said cutting roll (12) comprising a roll shell (14) recess (16) comprising an opposite surface (18) for said blade apparatus (10) and a fastening element (21) for fastening said blade apparatus (10) to the opposite surface (18) of said cutting roll (12), said blade apparatus (10) comprising:
-an elongated cutting blade (22) for cutting the pulp sheet, the elongated cutting blade being adapted to be fastened in the recess (16) of the cutting roll (12);
-an elongated bar (24) adapted to support the cutting blade (22) against the opposite surface (18), wherein the bar (24) comprises an opening (26) for a fastener (28);
-a fastener (28) comprising a head (30) for fastening the bar (24) to the opposite surface (18) by means of the fastener (28) through an opening in the bar (24); and
-an adjusting element (32) for positioning the bar (24) in a radial direction of the cutting roller (12);
characterized in that the bar (24) comprises a longitudinal blade recess (34) of the cutting blade (22) formed on the opposite side of the bar (24) with respect to the head (30) of each fastener (28), adapted to lock the cutting blade (22) between the bar (24) and the opposite surface (18) by means of friction locking.
2. A blade arrangement according to claim 1, characterized in that the blade recess (34) comprises a friction surface (36) in the direction of the plane of the guide bar (24) adapted to support the cutting blade (22) against the counter surface (18), and a bottom surface (38) at an angle to the friction surface (36) adapted to support the cutting blade (22) in the direction of the plane of the guide bar (24).
3. A blade arrangement according to claim 1 or 2, wherein the cutting blade (22) comprises two support surfaces (41) in the longitudinal direction of the cutting blade (22) and two edge surfaces (40) of the cutting blade (22), which support surfaces are adapted to be placed against the bar (24) and the counter surface (18), the support surfaces (41) and the edge surfaces (40) being uniform and continuous planar surfaces, respectively.
4. A blade arrangement according to any one of claims 1-3, wherein the cutting blade (22) comprises two support surfaces (41) in the longitudinal direction of the cutting blade (22) and two edge surfaces (40) of the cutting blade (22), which support surfaces are adapted to be placed against the guide bar (24) and the counter surface (18), each edge surface (40) having one blade edge (42), wherein the two edge surfaces (40) are parallel such that the cutting blade (22) can be turned 180 ° about its longitudinal axis to replace the cutting blade edge (42).
5. A transverse cutting device (11) of a sheet cutter of a pulp dryer (100), said transverse cutting device (11) comprising a fixed counterpart (104) and a rotating cutting roller (12), said cutting roller (12) comprising:
-a body (44) comprising two ends (46);
-an adjustable bearing housing (48) fitted at each end (46) for adjusting the distance between the cutting roll (12) and the counter piece (104);
-a roll shell (14) adapted to surround the body (44), wherein the roll shell (14) comprises at least one recess (16) for a blade apparatus (10) and a fastening element (21) for fastening the blade apparatus (10) to the opposite surface (18) comprised in the recess (16) of the roll shell (14); and
-a blade device (10) for cutting a fibrous web into pulp sheets, wherein the blade device (10) comprises:
-an elongated cutting blade (22) for cutting the pulp sheet, the elongated cutting blade being adapted to be fastened in the recess (16) of the cutting roll (12);
-an elongated bar (24) adapted to support the cutting blade (22) against the opposite surface (18), wherein the bar (24) comprises an opening (26) for a fastener (28);
-a fastener (28) comprising a head (20) for fastening the bar (24) to the opposite surface (18) through each opening (26) in the bar (24); and
-an adjusting element (32) for positioning the bar (24) in a radial direction of the cutting roller (12);
characterized in that the bar (24) comprises a longitudinal blade recess (34) of the cutting blade (22) formed on the opposite side of the bar (24) with respect to the head (30) of the fastener (28), adapted to lock the cutting blade (22) between the bar (24) and the opposite surface (18) by means of friction locking.
CN202010401103.4A 2019-05-15 2020-05-13 Blade device and transverse cutting machine Pending CN111941502A (en)

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FIU20194070U FI12451U1 (en) 2019-05-15 2019-05-15 Blade arrangement and cross section device

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Publication number Priority date Publication date Assignee Title
FI20215751A1 (en) * 2021-06-24 2022-12-25 Valmet Technologies Oy Method and device for cross-cutting a pulp web
CN113635374B (en) * 2021-08-24 2022-03-01 中联安全科技(天津)集团股份有限公司 Screen drawing machine for barrier explosion-proof material
FI131027B1 (en) * 2022-04-21 2024-08-06 Valmet Technologies Oy Arrangement in connection with cutting section of pulp drying machine and pulp drying machine

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CN107949460A (en) * 2015-07-22 2018-04-20 Cps有限责任公司 Device with quick replacement blade, for little by little transverse cuts or the perforation over the entire width of the former to the paper of movement, plastics or other materials

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US3899947A (en) * 1974-07-29 1975-08-19 Advance Enterprises Inc Auxiliary trim-out unit for printed webs
US5609084A (en) * 1992-05-18 1997-03-11 Gronbjerg; Ib Machine for cutting a paper web into sheets with simultaneous cutting of a transverse strip
CN101138849A (en) * 2006-07-04 2008-03-12 吉第联合股份公司 Cutting device using relative declining blade cutting strip
CN106794587A (en) * 2014-09-10 2017-05-31 弗斯伯股份公司 Device for transverse cuts web material and the machine comprising described device
CN204384579U (en) * 2014-12-26 2015-06-10 苏州现代纸品有限公司 A kind of lateral fold line broken line knife registration device
CN107949460A (en) * 2015-07-22 2018-04-20 Cps有限责任公司 Device with quick replacement blade, for little by little transverse cuts or the perforation over the entire width of the former to the paper of movement, plastics or other materials

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ES2972064T3 (en) 2024-06-11

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