• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY The following invention relates to a doctor blade device with an elongate doctor blade intended to work continuously against a roller (2) and / or cylinder surface (20) while scraping or wiping material (1B) on the surface (20), which doctor device (5) comprises a further the length of the bar beam (10) of the roll or cylinder surface with a holding arrangement (4) for positioning a bar part (3) arranged so that, in a longitudinal groove (15), slidably support the doctor blade (6) can be known that the bar part (3) comprises a bar blade (30), a patch member (14) arranged at the bar blade (30), and a spacer element (12) arranged between the patch member (14) and the bar blade, the bar blade (30), the patch member (14) and the spacer element (12) being arranged that along a first longitudinal side edge of the bar blade (30) therebetween forms said groove (15) for slidable longitudinal positioning of the doctor blade (6) below the stand of the bar blade (30), the patch (14) and the spacer element (12).
    公开号:SE1550098A1
    申请号:SE1550098
    申请日:2015-01-30
    公开日:2016-07-31
    发明作者:Eriksson Tore
    申请人:Cs Produktion Ab；
    IPC主号:
    专利说明:

    TECHNICAL FIELD The present invention relates to a scraper device with an elongated doctor blade intended to work continuously against a roller or cylinder surface while scraping or wiping material on the surface, which doctor device comprises a holder adapted to the length of the roller or cylinder surface with a thickness of the doctor blade. for receiving a long side of the doctor blade, the other long side of which projects out of the holder pair, which guard is dimensioned to allow slidable longitudinal positioning of the doctor blade under the stand of cradles defining the key.
    By "scraper" is meant a thin ruler or thin blade, usually of metal, which works continuously against a roller or cylinder surface during scraping or scraping. The scraper device will be described below when used for scraping off a web of paper from a Yankee cylinder in a tissue machine, but The scraper device can, of course, be used for scraping material from other wadding or cylinder surfaces and Wen in other machines than paper machines, as well as in certain applications for leveling the smear layers and scraping off excess when coating and when printing TECHNICAL POSITION In the manufacture of tissue, t. ex. toilet paper, kitchen paper, napkins and similar hygiene products are usually achieved with the softness of the paper and absorbed by a so-called cracking procedure. This process takes place so that the still wet fibrous layer / web formed during the forming of the paper is led into a drying cylinder and the finished, or partially dried, web is scraped and pulled off on the exit side of the cylinder, after which it is passed on to subsequent further drying and / or winding. These drying cylinders are called "Yankee cylinders" in the industry.
    The characteristic of these cylinders is the large diameter, which is 3-5 meters. The drying of the paper web takes place through the contact with the hot surface, which is usually heated by internal steam supply, as well as external hot air, sometimes supplemented with IR straining. In the above-mentioned removal (scraping), the so-called the cracking. In this process, the running web is "scraped" from the cylinder with a so-called opposite blade, 2 which with a certain pressure abuts against the cylinder surface. Because the running web meets the blunt surface of the said blade, a microfolding of the web / paper takes place. This microfolding, which is called scraping, increases the thickness and softness of the paper. A prerequisite for cracking to occur is that the running web has some adhesion to the cylinder surface. This adhesion can occur naturally in that the paper is not fully dried or that the fiber composition of the paper contains constituents that adhere to the cylinder surface. A common way of achieving the desired adhesion, however, is to apply adhesive from the cylinder surface. This is usually done by spraying the adhesive blank in a law-concentrated form on the cylinder surface.
    The actively acting machine component in the crimping process is thus an opposite blade, a so-called scraping scraper, which with a pressure abuts against the cylinder surface and whose long side has an abutment surface, which scrapes off and microfolds the paper. The scraping scraper is positioned in a holder, usually a beam, which has the following main functions: To provide an adjustable abutment pressure of the scraping scraper against the cylinder surface.
    Make it possible to add and remove crabshab.
    Enables rapid replacement of crab blades.
    The contact of the crab scraper with the cylinder surface exposes both the crab scraper and the cylinder surface to wear. This entails negative consequences in the process, in the form of wear. The consequences of wear and tear on the part of the crab scraper are that it must be replaced, which in addition to the cost of the crab scraper, entailed considerable costs for loss of production in connection with the replacement. The consequences of wear on the cylinder surface are that costly sanding of the surface then and there must be carried out. Since the cylinder is a pressure vessel, the cylinder must also have a certain jacket thickness. This meant that the cylinder had to be coated with a new wear surface after a certain number of regrinding. Another consequence of the scraping wear is that the quality of the scraped paper changes with the degree of wear.
    In order to keep the wear down, it is important to line as little pressure as possible between the scraper tip and the cylinder surface. However, a certain minimum pressure must be maintained to prevent the paper web or parts of the paper web from passing between the scraper and the cylinder surface, which otherwise causes web breakage.
    In the patent publication US 2010/0032112 (Eriksson) a method and a device for crimping are shown and described where traditional crimping blades are replaced with a belt which is continuously or discontinuously fed in the transverse direction of the paper machine. During the development work it has been found that the preferred embodiment of the invention has mainly two problems. One problem is that the preferred embodiment required replacement of the entire blade holder unit, which entailed large investment costs for the user.
    A conventional blade holder assembly is shown and described in US 3,778,861 (Goodnow). The holder unit has two chambers, and the sehaber blade protrudes from one chamber and a compression blade abutting the scraper blade protrudes from the other chamber. The invention described in US 2010/0032112 (Eriksson) cannot be used together with the blade holder unit according to US 3,778,861 (Goodnow).
    Replacement of traditional scraping blades with a continuous or discontinuously fed belt is edged by e.g. U.S. 5,138,740 (Goodnow et al.) Dar tya. band ends 15 can be connected to each other and the band can be used in the blade holder unit according to US 3,778,861 (Goodnow).
    Other scraper devices that use scraper belts are known by e.g. US 6,651,303 (Toivanen et al.) And US 6,202,252 (Harrison), but neither can these be used with conventional blade holder units such as the aforementioned US 3,778,861 (Goodnow). US 6,202,252 (Harrison) also shows that the long side edges of the doctor blade may be mirror-symmetrically inclined. After using the first bevelled edge, the strip is rolled up on a spool, and after watering the spool up and down, the unwound skewed second edge is ready to be used for scraping.
    The second problem in the invention according to US 2010/0032112 (Eriksson) is that the part which supported and controls the crimping belt, due to its sandwich construction and its fixed effort in the bar beam, is not flexible enough to generate even belt pressure along the entire cylinder surface. After uneven belt pressure leads to uneven wear of the strapping belt and can also cause wear damage to the roller or cylinder surface. The irregularities in obtaining even belt pressure can be partly caused by the roller or cylinder surface being crooked due to all the roller / cylinder being so loaded that its axis of rotation is crooked, that the roller or cylinder surface is bombarded, or that the cylinder is subjected to internal overpressure .
    The service life of the scraper scraper can be increased by the tip and contact surface of the scraper having a coating of finer material than the base body of the scraper scraper itself. 4 Examples of this solution are described in GB 2128551. The problem with this solution is that the harder material can more easily damage the cylinder surface, by e.g. wear.
    To reduce wear on the cylinder surface, the blank which increases the adhesion of the paper web to the cylinder surface can be combined with a blank which builds up a layer on the cylinder surface. Through this, the tip of the scraper scraper will "scrape" in the built-up layer in the stable to "scrape" against the cylinder surface. The disadvantage of this method is i.a. high consumption of chemicals and condensed heat transport through the cylinder and that chemical residues are mixed into the paper.
    Although the running times of the crab scrapers can be required with the above-mentioned methods, the crab scraper must be replaced after more or less long production intervals. Fors & has been made to reduce this problem by continuously feeding a long traditional crab scraper, in its longitudinal direction. Some, of several, problems that have made the method not firmly on the market are that construction entails costly maintenance, that the adjustment possibilities are limited, that the method requires a lot of space on both sides of the machine, and that the consumption of scrapers is high due to that the feed speed must be so high that the difference in wear between the input and output side does not give differences in quality between the two sides.
    BRIEF SUMMARY OF THE INVENTION The object of the present invention is to provide a doctor blade device, with continuous or intermittent longitudinal feeding of a doctor blade which can be used in conventional blade holder units and does not require replacement thereof.
    This object is achieved according to the invention by means in a scraper device of the type indicated in the first paragraph above, the holder comprises a bar blade, a patch member, and a spacer element arranged between the patch member and the bar blade, the bar blade, the patch member and the spacer element being joined together along a the first longitudinal side edge of the bar blade between them forms the said spare for longitudinally slidable positioning of the doctor blade under the stand of the bar blade, the patch and the spacer element.
    Thanks to the invention, the advantage of greatly reduced installation costs is achieved by the fact that existing blade holder units can be reused and that production losses in connection with installation can be reduced considerably.
    In order to reduce the bending stiffness of the bar blade, it is suitable that the spacer element is divided into a series of successive spacer element parts, that the patch member is divided into a series of successive patch part parts, and that the number of spacer element parts is equal to the number of patch parts. Lamping is the joining, challenge with screws or rivets (possibly welding and / or gluing), whereby it is appropriate that the number of screws or rivets is twice as large as the number of spacer parts and the number of patch parts, and that each screw or rivet passes through a patch part and a spacer member portion, but does not protrude beyond the outer surface of the bar blade, which is advantageously smooth for flexible engagement with a pressing mechanism.
    In order to further reduce the bending stiffness of the bar blade, the bar blade preferably has a plurality of transverse release slots which extend from a second longitudinal side edge of the bar blade and are evenly distributed along the length of the bar blade. These slits suitably have a length of 50-75% of the width of the bar blade. The slots reduce thermal stresses in the bar blade blade caused by uneven temperature distribution. Preferably, said second longitudinal side edge of the bar blade faces the bottom of a chamber formed between a first patch and a second patch in a doctor beam or other bar beam, the chamber being configured to allow a certain rocking of the bar blade in the recess while the bar blade stands against said bottom. The flexibility that is important for the function, which in US 2010/0032112 (Eriksson) consisted of a weakening in the vicinity of the fixed clamped part, can thus, according to the invention, take place in the stand of the bar blade in the bar beam.
    Preferably, the bar beam comprises a second chamber formed between said second patch and a third patch, and a press blade extends from a bottom of said second chamber out between the second and third loops to line abutment against the carrier blade along a line adjacent the bottom of the groove for schaberbladet. This facilitates the attainment of even abutment pressure for the doctor blade.
    It is ideal for the doctor blade to have a length which is several times the length of the mud or cylinder surface which the doctor blade is to work against and is therefore band-shaped. In this way, reduced stopping times for leaf change are achieved.
    If desired, the spirits of the doctor blade can be fixed to each other to form a continuous doctor belt. For a doctor blade to be used for scraping a web of tissue, it may be appropriate for at least one longitudinal side edge of the doctor blade to be ground at an angle of about 60 ° to about 90 ° to adjacent sides of the doctor blade to provide one in many cases (not desired angle of about 80 ° to about 110 ° between the ground surface and a tangent to the roller or cylinder surface at the point of abutment of the doctor blade with the roller or cylinder surface.
    If desired, both longitudinal side edges of the doctor blade may be ground so that the doctor blade has a rotationally symmetrical cross-section, and that one band at the joints in which the spirals are twisted a halite varies relative to the other to form a Mobius band with a single side and a single longitudinal edge. As a result, the continuous operating time of the doctor blade between belt changes can be doubled.
    BRIEF DESCRIPTION OF THE DRAWINGS In the following, the invention will be further described with reference to preferred embodiments and the accompanying drawings.
    Figure 1 is a schematic side view ay a kand krappschaber (US 2010/0032112 (Eriksson)), which view shows the principles for the same.
    Figure 2 is a schematic side view of a scraper scraper comprising a scraper device according to the invention with a scraper blade and a holder, which is mounted in a kand type of traditional bar beam and comprises a bar blade, a patch member and an intermediate spacer and is held in a bar beam, which also hailer a pressure blade abutting the bar blade.
    Figure 3 is a plan and a part of a preferred embodiment of the holder.
    Figure 4 is an enlarged bull section view of the doctor blade and adjacent parts of the holder according to the section line IV-IV in Figure 3.
    DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Fig. 1 shows a side view of crab scraper device 5 in accordance with US 2010/0032112 (Eriksson), with which a tissue surface 20 of a Yankee cylinder 2 adhered to a web of paper 1C. The crab scraper device 5 is rotatably suspended in an anchoring part 8, preferably in the form of shaft pins. By means of the rotary movement, the crab scraper device 5 can be positioned in working position or inactivated position. The crab scraper device comprises a bar beam 10 consisting of an elongate body with anchoring means (eg circular recesses) provided for said shaft pins. At the upper part of the body there is a lug 77 at which a holder part 3 is clamped with a holding arrangement 4. A doctor blade (which can also be referred to as a scraping band) 6 is slidably / movably arranged in a gap in the holder part 3. In order to be able to use this construction optimally there is a pivotable joint 34, has in the form of a waist which forms a pivotable, resilient joint. By pivoting the portion above the pivot joint 34, the doctor blade 6 can be given different pressures and / or angles 3 for its abutment against the mantle surface 20. The result of the scraping operation, i.e. i.a. the thickness and macrostructure of the crimped paper web 1C, however, is not controlled primarily by the angle p but by the so-called the abutment or impact angle between the upstream segment of a tangent to the shell surface 20 at the abutment point 62 of the doctor blade 6 and the abutment or abutment surface 60 of the incoming web 1B.
    Furthermore, a pressing device 9 is shown, which consists of an elongated (or longitudinally divided / sectioned) body and which is approximately pivotally arranged in the middle of said body around a pivot point 7. At the upper end of the pressing body there is a pressing device 91 (which may be elongated or sectioned ), which with its spirit abuts against the cap part 3, a line is caught above the said joint point 34, so that a pressing with the aid of the pressing device 91 can affect the pressing force of the doctor blade 6. Pressing force can be applied by means of one or more pressure means 96 (preferably a flexible, inflatable hose ) to direct the pressing pressure of the doctor blade against the jacket surface 20 at its contact line 62.
    Figure 2 shows a side view of an embodiment according to the invention. An important difference in relation to the prior art shown in Figure 1 is that the invention can use a holding device 8 and a bar beam 10 according to a conventional, commonly used embodiment.
    Figure 2 shows a kind of conventional holding device 8 with a conventional bar beam 10 and a conventional pressing arrangement 9, in which a doctor blade arrangement 3,6,12,14 is arranged, in accordance with a preferred embodiment of the invention.
    The scraper arrangement according to the invention comprises a holder part 3 in the form of a bar blade 30, at which a movable wear part 6 is arranged at the top. The wear part 6 is movably arranged in a gap 15 (see Fig. 4) which is arranged between a patch member 14 and 8. . Spacers 12 are arranged between the patch member 14 and the carrier blade 30, in order to create a desired gap 15, which makes it possible to stably arrange the wear part 6 but with sufficient space in the gap 15 to be able to displace the wear part 6 in its longitudinal direction in the desired manner. The carrier blade 30 is arranged in a first chamber 100 which is arranged between a first patch 102 and a second patch 103 in the carrier beam 10, which are preferably designed in accordance with conventional doctoring techniques. According to a preferred embodiment of the invention, the barber blade 30 is designed so that a traditional doctor blade can be used as a starting material, which entailed many advantages also from a cost perspective. Thus, the carrier blade is suitably in steel and suitably has a thickness T in the range 0.5-3 mm and a width B in the range 75-150 mm. The carrier blade 30 abuts with its lower end 31 against the bottom 101 of the chamber 100 and is clamped during operation with its lower end 31 in an outer horn A of the bottom, which horn A then acts as a kind of pivot point for the bar blade 30 and which allows the holder blade to flex inside the space of the first chamber 100.
    The chamber 100 suitably has a width which substantially exceeds the thickness t of the holding blade 30. It further appears that the bar beam 10 is arranged with a second chamber 104 inside which there is arranged a pressing blade 91, and a leveling device 96 entering a pressing device 9 also in accordance with kand technique. With the leveling device 96 in cooperation with a third patch 105, the pressing force F of the pressing blade 91 can be regulated in a per se manner and thereby exert a desired pressing force F against the holder part 3 and down the wear part 6 in abutment against the surface 20 of the roller 2. During operation the wear part 6 either at certain intervals, or continuously moved to renew the wear surface 60 of the wear member 6. The wear member is suitably made of steel suitably with a thickness T in the range 0.4-1.5 mm and a width bi in the range 10 - mm.
    Figure 3 shows a part of a bar blade 30 according to the invention seen from the front. It can be seen that the patch member 14 is suitably arranged in the form of a plurality of separate elements 14 ', which are attached to the bar blade 30 by means of screw elements 13. In the left part of Figure 3 it is shown that circular washers 12', preferably standard washers in stainless steel, are preferably used. as a spacer member 12 to provide a desired gap S Indian carrier blade 30 and patch member 14 to accommodate the wear member 6 without clamping. In a position closer to the center of Figure 3 it is indicated that the spacer member 12 may also have a different design, for example in the form of rectangular washers 12 It is understood that the spacer element 12 may of course be an elongate cohesive unit, either by itself or integrated with the patch member 14. Figure 4 shows a cross section of the upper part of a carrier blade 3 with wear part 6, as indicated in figure 3. It can be seen that the wear part 6 inserts a sufficient piece down into the gap 15 which is formed between the patch member 14 and the upper part 31 of the bar blade for It is further apparent that the patch member 14 is arranged with its upper end 140 at a distance X (suitably about 3-15 mm) below the upper end 31 of the carrier blade, in order to be able to create sufficient space between the wear part 6 and the rolling surface 20 for arranging the wear part 6 at the desired angle 13 in relation to the rolling surface 20 and that the upper part of the patch member is advantageously arranged with a bevel 14 A for the same purpose. Furthermore, it is shown that the washer 12 is advantageously arranged by means of a screw 13 which has a load passage 13 A, or is otherwise securely anchored in the carrier blade 3. Preferably, the screws 13 are tightened firmly against the washer 12, which can further secure things for anchoring. A possible modification is to arrange a circular washer 12 'which, by not being clamped against the carrier blade 3, can be arranged freely rotatable around the screw 13, whereby movement of the wear part 6 can be further facilitated.
    权利要求:
    Claims (12)
    [1]
    A doctor blade device with an elongate doctor blade intended to continuously work against a roller (2) and / or cylinder surface (20) while scraping or wiping material (1B) on the surface (20), which doctor blade device (5) comprises one of the roller or cylinder surface length adapted bar beam (10) with a retaining arrangement (4) for positioning a bar part (3) arranged to, in a longitudinal groove (15), slidably support the doctor blade (6), characterized in that the bar part (3) comprises a bar blade (30). ), a patch member (14) arranged at the bar blade (30), and a spacer element (12) arranged between the patch member (14) and the bar blade, the bar blade (30), the patch member (14) and the spacer element (12) being arranged along a first longitudinal side edge of the bar blade (30) between them forms said groove (15) for slidable longitudinal positioning of the doctor blade (6) under the stand of the bar blade (30), the patch (14) and the spacer element (12).
    [2]
    Scraper device according to claim 1, characterized in that said bar beam (10) is provided with a first chamber (100) arranged to accommodate a long side of the bar blade (30), the second long side of which projects out of said chamber (100).
    [3]
    Scraper device according to claim 2, characterized in that said chamber (100) has a transverse opening (D) greater than the thickness (T) of the bar blade (30), and preferably said second longitudinal side edge of the bar blade (30) against the bottom (101) of said chamber (100), the chamber (100) being designed so as to allow a certain tilting of the bar blade (30) in the recess while the bar blade (30) rests against said bottom (101).
    [4]
    Scraper device according to one of the preceding claims, characterized in that the spacer element (12) consists of a part which is separate with respect to the patch member (14).
    [5]
    Scraper device according to claim 4, characterized in that said spacer element (12) is divided into a row of successive spacer element parts (12 ', 12 ").
    [6]
    A scraper device according to any one of the preceding claims, characterized in that the patch member (14) is divided into a series of successive patch portions (14 '). 11
    [7]
    Scraper device according to claims 5 and 6, characterized in that the number of spacer element parts (12 ', 12 ") is equal to the number of patch parts (14').
    [8]
    A scraper device according to any one of claims 1-7, characterized in that the bar blade (30) has a plurality of transverse release slots (35) projecting from a second longitudinal side edge of the bar blade, which are preferably evenly distributed along the length of the bar blade.
    [9]
    A doctor blade device according to any one of the preceding claims, characterized in that the doctor blade (6) has a width (b) which is 5-50% of the width (B) of the bar blade, preferably 10-30%.
    [10]
    Scraper device according to claim 9, characterized in that the bar beam (10) comprises a second chamber (104) formed between a second patch (103) and a third patch (105), and that a pressing blade (91) extends from a bottom in said second chamber extends between the second and third flaps (103, 105) in line abutment with the bar blade (30), preferably adjacent the bottom of the groove (15) for the doctor blade (6).
    [11]
    A doctor blade device according to any one of claims 1-10, characterized in that the doctor blade (6) has a length which is several times greater than the length of the roller or cylinder surface (2,20) against which the doctor blade (6) is to work, preferably the spirits of the doctor blade are fixed to each other to form a continuous doctor blade.
    [12]
    A doctor blade device according to claim 11, characterized in that at least one longitudinal side edge (60) of the doctor blade (6) is ground to an angle of about 60 ° to about 90 ° to adjacent sides of the doctor blade (6) to give a desired angle of about 80 ° to about 95 ° between the ground surface and a tangent to the roller or cylinder surface (2,20) at the point of abutment of the doctor blade against the roller or cylinder surface, preferably bathing both longitudinal side edges of the doctor blade (6) there ground so that the doctor belt has a rotationally symmetrical cross-section, and that one band band at the joining of the spirits is twisted halfway relative to the other to form a Mobius band with a single side and a single longitudinal side edge. 1/4 Fig- 2 2/4 3/4 IV 14 '132 "12" 12' 14 '12' 13 -; 6'®66eece 61-61 b:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE1550098A|SE538611C2|2015-01-30|2015-01-30|Doctor apparatus|SE1550098A| SE538611C2|2015-01-30|2015-01-30|Doctor apparatus|
    PCT/SE2015/051361| WO2016122370A1|2015-01-30|2015-12-17|Doctor blade device|
    BR112017016495-7A| BR112017016495B1|2015-01-30|2015-12-17|SCRAPER BLADE DEVICE|
    KR1020177021428A| KR20170106983A|2015-01-30|2015-12-17|Doctor Blade Device|
    US15/546,612| US10569491B2|2015-01-30|2015-12-17|Doctor blade device|
    ES15880336T| ES2808668T3|2015-01-30|2015-12-17|Scraper device|
    EP15880336.1A| EP3250374B1|2015-01-30|2015-12-17|Doctor blade device|
    PL15880336T| PL3250374T3|2015-01-30|2015-12-17|Doctor blade device|
    CN201580075106.0A| CN107405856B|2015-01-30|2015-12-17|Scraper device|
    JP2017536005A| JP6860918B2|2015-01-30|2015-12-17|Doctor blade device|
    US16/745,445| US11072142B2|2015-01-30|2020-01-17|Doctor blade device|
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