ES2580205T3 - Scraper blade for a fiber mesh machine and installation of the scraper in a fiber mesh machine - Google Patents
Scraper blade for a fiber mesh machine and installation of the scraper in a fiber mesh machine Download PDFInfo
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- ES2580205T3 ES2580205T3 ES10835547.0T ES10835547T ES2580205T3 ES 2580205 T3 ES2580205 T3 ES 2580205T3 ES 10835547 T ES10835547 T ES 10835547T ES 2580205 T3 ES2580205 T3 ES 2580205T3
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- blade
- scraper
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- scraper blade
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G3/00—Doctors
- D21G3/005—Doctor knifes
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G3/00—Doctors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
- B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
- B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
- B05C1/0817—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
- B05C11/041—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for positioning, loading, or deforming the blades
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/34—Knife or blade type coaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
- B05C11/044—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for holding the blades
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
- B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
- B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
- B05C11/045—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by the blades themselves
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- Paper (AREA)
Abstract
Cuchilla rascadora para una máquina de malla de fibra, la cuchilla rascadora (10) incluyendo una sección de la cuchilla (11) y una sección de retención de fijación (12), en la que en el plano de la sección transversal, la sección de la cuchilla (11) es asimétrica y la sección de retención de fijación (12) comprende una parte adelgazada que tiene un cuello (28) y rebordes (29) sustancialmente simétricos alrededor de un eje de simetría colocado en la dirección del ancho de la cuchilla rascadora, de modo que la cuchilla rascadora (10) puede ser instalada mediante su sección de retención de fijación (12) en dos posiciones opuestas siendo girada alrededor de un eje central colocado en su dirección del ancho paralela al eje de simetría de la parte adelgazada de la sección de retención de fijación (12) para proporcionar dos funciones diferentes, en la que la sección de la cuchilla (11) tiene una punta achaflanada (22) para formar una superficie de contacto en la primera función como cuchilla de rascado para extraer agua y material fino de una superficie que se vaya a rascar y en la que la sección de la cuchilla (11) tiene un saliente asimétrico (24) que forma una superficie de flujo (23) en la segunda función como cuchilla de lámina metálica.Scraper blade for a fiber mesh machine, the scraper blade (10) including a blade section (11) and a fixing retaining section (12), in which in the plane of the cross section, the section of The blade (11) is asymmetric and the fixing retention section (12) comprises a thinned part having a neck (28) and substantially symmetrical flanges (29) around an axis of symmetry positioned in the direction of the width of the blade scraper, so that the scraper blade (10) can be installed by its fixing retention section (12) in two opposite positions being rotated around a central axis positioned in its direction of the width parallel to the axis of symmetry of the thinned part of the fixing retaining section (12) to provide two different functions, in which the blade section (11) has a chamfered tip (22) to form a contact surface in the first function as a scraping blade to extract water and fine material from a surface to be scratched and in which the section of the blade (11) has an asymmetrical projection (24) that forms a flow surface (23) in the second function as a blade of metal sheet.
Description
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DESCRIPCIONDESCRIPTION
Cuchilla rascadora para una maquina de malla de fibra e instalacion de la rascadora en una maquina de malla de fibraScraper blade for a fiber mesh machine and installation of the scraper in a fiber mesh machine
La invencion se refiere a una cuchilla rascadora para una maquina de malla de fibra, la cuchilla rascador a incluyendo una seccion de la cuchilla y una seccion de retencion de fijacion. La invencion tambien se refiere a una instalacion de la cuchilla en una maquina de malla de fibra.The invention relates to a scraper blade for a fiber mesh machine, the scraper blade to including a section of the blade and a fixing retention section. The invention also relates to an installation of the blade in a fiber mesh machine.
Diversas cuchillas rascadoras se utilizan en una maquina de malla de fibra principalmente para mantener limpias las superficies del rodillo. Las cuchillas rascadoras tambien pueden ser utilizadas para deshidratar, por ejemplo, en un rodillo de succion. Convencionalmente, la seccion de la cuchilla esta compuesta por un componente a modo de placa que tiene uno de sus bordes achaflanado y el borde opuesto al chaflan instalado como una retencion de fijacion. Se utilizan remaches en cuchillas rascadoras delgadas, y particularmente en las cuchillas rascadoras gruesas, la retencion de fijacion puede estar formada en el material basico de la cuchilla rascadora. La seccion de retencion de fijacion asegura que la cuchilla rascadora se mantenga en su sitio en el soporte de la cuchilla. Las cuchillas rascadoras generalmente estan fabricadas de metal, plastico, plastico reforzado con fibra o una composicion de plastico. Algunas cuchillas rascadoras se proponen en la solicitud de patente finlandesa N° No. 20065601.Various scraper blades are used in a fiber mesh machine primarily to keep roller surfaces clean. Scraper blades can also be used to dehydrate, for example, in a suction roller. Conventionally, the section of the blade is composed of a plate-like component that has one of its chamfered edges and the edge opposite the chamfer installed as a fixing retainer. Rivets are used in thin scraper blades, and particularly in thick scraper blades, the retaining retention may be formed in the basic material of the scraper blade. The fixing retention section ensures that the scraper blade is held in place in the blade holder. Scraper blades are generally made of metal, plastic, fiber reinforced plastic or a plastic composition. Some scraper blades are proposed in Finnish patent application No. 20065601.
Una cuchilla rascadora segun el estado de la tecnica es conocida a partir el documento US 5520731. Cuchillas rascadoras adicionales son conocidas a partir de los documentos WO 2004/067839 A1 y WO 2008/034952 A1.A scraper blade according to the state of the art is known from US 5520731. Additional scraper blades are known from WO 2004/067839 A1 and WO 2008/034952 A1.
Sin embargo, las cuchillas rascadoras conocidas tienen una serie de limitaciones. En primer lugar, diversas posiciones requieren una cierta clase de cuchilla rascadora, lo cual incrementa el numero de cuchillas rascadoras diferentes en una maquina de malla de fibra. Ademas, los soportes de la cuchilla pueden establecer requisitos adicionales para las cuchillas rascadoras. Para el rascador de rodillos o bandas de superficie particularmente blanda, se utilizan cuchillas de plastico las cuales de forma ventajosa se doblan y la seccion de la cuchilla de la cual se hunde facilmente. Las cuchillas de plastico tambien se doblan facilmente durante el almacenaje. La adaptacion de una cuchilla rascadora doblada a la superficie del rodillo es incompleta, lo cual causa, por ejemplo, falta de uniformidad en el perfil de contacto o por lo demas un resultado de un rascado incompleto. Los trastornos en el rascado causan roturas de la malla y variaciones locales de la presion en la superficie acortan la vida del tejido.However, known scraper blades have a number of limitations. First, various positions require a certain kind of scraper blade, which increases the number of different scraper blades in a fiber mesh machine. In addition, blade holders may establish additional requirements for scraper blades. For the roller scraper or particularly soft surface strips, plastic blades are used which advantageously bend and the section of the blade from which it easily sinks. Plastic blades also fold easily during storage. The adaptation of a bent scraper blade to the surface of the roller is incomplete, which causes, for example, lack of uniformity in the contact profile or otherwise a result of incomplete scratching. Scratch disorders cause mesh breaks and local variations in surface pressure shorten the life of the tissue.
Es un objeto de la invencion proporcionar una cuchilla rascadora novedosa para una maquina de malla de fibra con unas funciones mas versatiles que anteriormente. Otro objeto de la invencion es proporcionar una instalacion de una rascadora novedosa en una maquina de malla de fibra, instalacion la cual se pueda adaptar en muchas posiciones. Estos objetos se resuelven con una cuchilla rascadora segun la reivindicacion 1 y una instalacion de la rascadora segun la reivindicacion 4. Las configuraciones caractensticas de la cuchilla rascadora segun esta invencion son que en el plano seccional transversal la seccion de la cuchilla es asimetrica mientras la seccion de retencion de fijacion es sustancialmente simetrica de modo que la cuchilla rascadora puede ser instalada en dos posiciones opuestas para proporcionar dos funciones diferentes. Debido a la asimetna de la seccion de la cuchilla, la cuchilla rascadora esta provista de dos clases de propiedades, las cuales diversifican la utilizacion de la cuchilla rascadora. En otras palabras, una clase de una cuchilla rascadora puede ser utilizada para dos propositos diferentes simplemente cambiando la posicion de la cuchilla rascadora. De forma correspondiente, las configuraciones caractensticas de la instalacion de la rascadora segun la invencion son que en el plano seccional transversal la seccion de la cuchilla es asimetrica mientras la seccion de retencion de fijacion es sustancialmente simetrica de modo que la cuchilla rascadora puede ser instalada en el soporte de la cuchilla mediante su seccion de retencion de fijacion en dos posiciones opuestas para proporcionar dos funciones diferentes. Segun la invencion, una seccion de retencion de fijacion simetrica permite instalar la cuchilla rascadora en el soporte de la cuchilla en ambas direcciones. Con un diseno y un dimensionado adecuados la cuchilla rascadora se ajusta en soportes de cuchillas de diversos fabricantes. Por lo tanto la cuchilla rascadora segun la invencion puede ser instalada en la mayona de las posiciones en cuyo caso una maquina de malla de fibra requiere menos cuchillas rascadoras diferentes en comparacion como ocunia hasta ahora.It is an object of the invention to provide a novel scraper blade for a fiber mesh machine with more versatile functions than before. Another object of the invention is to provide an installation of a novel scraper in a fiber mesh machine, which installation can be adapted in many positions. These objects are solved with a scraper blade according to claim 1 and an installation of the scraper according to claim 4. The characteristic configurations of the scraper blade according to this invention are that in the cross-sectional plane the section of the blade is asymmetric while the section Fixing retention is substantially symmetrical so that the scraper blade can be installed in two opposite positions to provide two different functions. Due to the asymmetry of the blade section, the scraper blade is provided with two kinds of properties, which diversify the use of the scraper blade. In other words, a class of a scraper blade can be used for two different purposes simply by changing the position of the scraper blade. Correspondingly, the characteristic configurations of the scraper installation according to the invention are that in the cross-sectional plane the section of the blade is asymmetrical while the fixing retention section is substantially symmetrical so that the scraper blade can be installed in the blade holder by means of its fixing retention section in two opposite positions to provide two different functions. According to the invention, a symmetrical fixing retaining section allows the scraper blade to be installed in the blade holder in both directions. With a suitable design and dimensioning, the scraper blade fits into blade holders of various manufacturers. Therefore the scraper blade according to the invention can be installed in the majority of the positions in which case a fiber mesh machine requires fewer different scraper blades compared as before.
La invencion se describe mas adelante en detalle haciendo referencia a los dibujos adjuntos los cuales ilustran algunas de las formas de realizacion de la invencion en los cuales:The invention is described in detail below with reference to the accompanying drawings which illustrate some of the embodiments of the invention in which:
la figura 1 muestra dos instalaciones de rascadoras segun la invencion adaptadas a la proximidad de una superficie que se va a rascar,Figure 1 shows two scraper installations according to the invention adapted to the proximity of a surface to be scratched,
la figura 2a es una vista desde el extremo de un primer ejemplo de aplicacion de la cuchilla rascadora segun la invencion,Figure 2a is a view from the end of a first example of application of the scraper blade according to the invention,
la figura 2b es una vista desde el extremo de un segundo ejemplo de aplicacion de la cuchilla rascadora segun la invencion,Figure 2b is a view from the end of a second example of application of the scraper blade according to the invention,
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la figura 3 es una vista en seccion transversal axonometrica del ejemplo de aplicacion de la figura 2a, la figura 4 muestra una modificacion de la instalacion de la rascadora segun la invencion.Figure 3 is an axonometric cross-sectional view of the application example of Figure 2a, Figure 4 shows a modification of the scraper installation according to the invention.
La figura 1 muestra dos instalaciones de la rascadora segun la invencion para una maquina de malla de fibra. La cuchilla rascadora incluida en la instalacion de la rascadora esta pensada particularmente para extraer agua y materia fina de la superficie que se va a rascar. Espedficamente, la instalacion de la rascadora segun la invencion es adecuada para rascar rodillos recubiertos, bandas y bandas de transferencia asf como rodillos de superficie abierta. En una maquina de malla de fibra, tal como una maquina de papel o de carton, se utilizan rodillos de superficie abierta por diversas razones. En un rodillo de succion, por ejemplo, la envoltura esta perforada para conducir un efecto de vado desde el interior del rodillo hacia el exterior del mismo. Los taladros forman la superficie abierta de la envoltura. Por otra parte, tambien se utilizan rodillos ranurados, en los cuales la superficie de la envoltura esta ranurada principalmente para mejorar el deshidratado. Un rodillo de succion con una superficie ranurada tambien existe, la envoltura del cual esta provista de ambos, taladros y ranuras. Ademas o en lugar de ranuras, se pueden utilizar, por ejemplo, taladros ciegos. Recubrimientos blandos tambien se utilizan en los rodillos mientras las bandas y las bandas de transferencia son de superficie blanda por su naturaleza. Ademas, la superficie de una banda, por ejemplo, puede estar ranurada.Figure 1 shows two installations of the scraper according to the invention for a fiber mesh machine. The scraper blade included in the installation of the scraper is specially designed to extract water and fine matter from the surface to be scratched. Specifically, the installation of the scraper according to the invention is suitable for scraping coated rollers, transfer bands and belts as well as open surface rollers. In a fiber mesh machine, such as a paper or cardboard machine, open-surface rollers are used for various reasons. In a suction roller, for example, the wrapper is perforated to drive a ford effect from the inside of the roller to the outside thereof. The holes form the open surface of the envelope. On the other hand, grooved rollers are also used, in which the surface of the wrap is grooved primarily to improve dehydration. A suction roller with a grooved surface also exists, the envelope of which is provided with both holes and grooves. In addition or instead of grooves, blind holes can be used, for example. Soft coatings are also used on the rollers while the bands and transfer bands are soft surface by nature. In addition, the surface of a band, for example, can be grooved.
Generalmente, la cuchilla rascadora 10 incluye una seccion de la cuchilla 11 y una seccion de retencion de fijacion 12 (figuras 2a y 2b). En ambas formas de realizacion representadas en la figura 1, la seccion de la cuchilla 11 esta adaptada para un contacto ligero con la superficie 14 del rodillo 13. La cuchilla rascadora 10 puede estar cargada, por ejemplo, con el soporte de la cuchilla 15 propuesto, el cual incluye una placa de fijacion 16 y un soporte 17. La placa de fijacion 16 esta sostenida en las construcciones de la maquina de malla de fibra y una manguera de carga 18 esta provista entre la placa de fijacion 16 y el soporte 17. En este caso la cuchilla rascadora se carga mediante presurizacion de la manguera de carga. De forma correspondiente, la cuchilla rascadora se puede desprender de la superficie que va a ser rascada conduciendo vado hacia la manguera de carga para la sustitucion de la cuchilla rascadora, por ejemplo. Este diseno del soporte de la cuchilla tambien incluye una cuchilla prensadora 19 con el cual el efecto de sujecion y carga del soporte 17 se puede extender suficientemente lejos. Ademas, las caractensticas del soporte de la cuchilla pueden ser variadas cambiando la cuchilla prensadora.Generally, the scraper blade 10 includes a section of the blade 11 and a fixing retention section 12 (Figures 2a and 2b). In both embodiments shown in Figure 1, the section of the blade 11 is adapted for light contact with the surface 14 of the roller 13. The scraper blade 10 may be loaded, for example, with the proposed blade holder 15 , which includes a fixing plate 16 and a support 17. The fixing plate 16 is supported in the constructions of the fiber mesh machine and a loading hose 18 is provided between the fixing plate 16 and the support 17. In this case the scraper blade is loaded by pressurizing the loading hose. Correspondingly, the scraper blade can be detached from the surface to be scratched by leading forwards to the loading hose for replacement of the scraper blade, for example. This design of the blade holder also includes a pressing blade 19 with which the holding and loading effect of the support 17 can be extended sufficiently far. In addition, the characteristics of the blade holder can be varied by changing the pressing blade.
La abrazadera inferior perfilada 20 del soporte 17 junto con la cuchilla prensadora 19 forman un espacio al cual se adapta la seccion de retencion de fijacion de la cuchilla rascadora 10. Esto asegura que la cuchilla rascadora se mantiene en su sitio en el soporte de la cuchilla mientras permite al mismo tiempo una sustitucion facil y rapida de la cuchilla rascadora. Segun la invencion, la seccion de la cuchilla es asimetrica en el plano de la seccion transversal mientras la seccion de retencion de fijacion es sustancialmente simetrica de modo que la cuchilla rascadora puede ser instalada en dos posiciones opuestas para proporcionar dos funciones diferentes. Debido al diseno asimetrico, la cuchilla rascadora de forma sorprendente esta provista de dos funcionalidades de las cuales la que se adecua a la posicion concerniente se selecciona en cada caso espedfico. Como tambien se representa en las figuras, la cuchilla rascadora es girada de tal modo que la superficie que es la superficie inferior de la seccion de la cuchilla en una aplicacion, es la superficie superior en la segunda aplicacion y viceversa. Al mismo tiempo, uno y el mismo lado de la cuchilla rascadora esta en el espacio en ambas aplicaciones. En otras palabras, la cuchilla rascadora es girada alrededor del eje central colocado en su direccion del ancho. Segun la figura 2a este eje central es paralelo al eje de simetna de la seccion de retencion de fijacion 12. El eje de simetna esta ilustrado con una lmea de puntos y rayas en las figuras 2a y 2b.The profiled lower clamp 20 of the support 17 together with the pressing knife 19 form a space to which the fixing retention section of the scraper blade 10 is adapted. This ensures that the scraper blade is held in place in the blade holder. while allowing easy and quick replacement of the scraper blade. According to the invention, the blade section is asymmetric in the plane of the cross section while the fixing retention section is substantially symmetrical so that the scraper blade can be installed in two opposite positions to provide two different functions. Due to the asymmetrical design, the scraper blade is surprisingly provided with two functionalities of which the one that suits the position concerned is selected in each specific case. As also shown in the figures, the scraper blade is rotated in such a way that the surface that is the lower surface of the blade section in one application, is the upper surface in the second application and vice versa. At the same time, one and the same side of the scraper blade is in space in both applications. In other words, the scraper blade is rotated around the central axis placed in its width direction. According to figure 2a this central axis is parallel to the symmetry axis of the fixing retaining section 12. The symmetry axis is illustrated with a line of dots and stripes in figures 2a and 2b.
La instalacion rascadora colocada en la posicion superior de la figura 1 corresponde a la primera funcion segun la invencion, esta funcion siendo una cuchilla de rascado. En otras palabras, la punta 21 de la seccion de la cuchilla 11 de la cuchilla rascadora 10 entra en contacto con la superficie 14 que se va a rascar y extrae el agua y las impurezas.The scraper installation placed in the upper position of figure 1 corresponds to the first function according to the invention, this function being a scraper blade. In other words, the tip 21 of the section of the blade 11 of the scraper blade 10 comes into contact with the surface 14 to be scratched and removes water and impurities.
La cuchilla de rascado tiene una punta achaflanada 22 para proporcionar una superficie de contacto. Con esto, se evita la formacion de una carga lineal y la cuchilla rascadora se apoya en la superficie que se va a rascar sobre una distancia mas larga que en las aplicaciones conocidas. La longitud de la punta achaflanada naturalmente depende de las dimensiones de la cuchilla rascadora. Generalmente, la longitud de la punta achaflanada es del 10 - 20% del ancho de la cuchilla rascadora. Ademas, el angulo de la punta achaflanada esta dimensionado de tal modo que la punta achaflanada se puede adaptar sustancialmente segun la superficie que se va a rascar. Con una cuchilla rascadora de este tipo, se consigue un buen rascado incluso con una pequena carga de la cuchilla. Adicionalmente, el desgaste de la cuchilla rascadora se reduce y por encima de todo el riesgo de danado de una superficie blanda es bajo.The scraper blade has a chamfered tip 22 to provide a contact surface. With this, the formation of a linear load is avoided and the scraper blade rests on the surface to be scratched over a longer distance than in known applications. The length of the chamfered tip naturally depends on the dimensions of the scraper blade. Generally, the length of the chamfered tip is 10-20% of the width of the scraper blade. In addition, the angle of the chamfered tip is sized so that the chamfered tip can be substantially adapted according to the surface to be scratched. With such a scraper blade, good scratching is achieved even with a small blade load. Additionally, the wear of the scraper blade is reduced and above all the risk of damage to a soft surface is low.
La instalacion rascadora colocada en la posicion inferior de la figura 1 corresponde a la segunda funcion segun la invencion, esta funcion siendo una cuchilla de lamina metalica. La lamina metalica, tambien rasca parcialmente la superficie 14 con la punta 21; sin embargo, es esencial que se forme un espacio estrecho entre la superficie 14 y la cuchilla rascadora 10 en el cual se crea un vado debido al movimiento mutuo de la superficie 14 y la cuchilla rascadora 10. Este vado absorbe el agua y la materia fina desde la superficie abierta, lo cual es ventajoso para el funcionamiento de la maquina de malla de fibra. Las cuchillas de lamina metalica conocidas son mas gruesas yThe scraper installation placed in the lower position of figure 1 corresponds to the second function according to the invention, this function being a metal blade. The metal sheet also partially scratches the surface 14 with the tip 21; however, it is essential that a narrow space is formed between the surface 14 and the scraper blade 10 in which a ford is created due to the mutual movement of the surface 14 and the scraper blade 10. This ford absorbs water and fine matter from the open surface, which is advantageous for the operation of the fiber mesh machine. Known metal sheet blades are thicker and
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requieren un soporte de una clase completamente propia para ellas. Sin tener en cuenta la aplicacion, la cuchilla rascadora segun la invencion puede ser utilizada para un soporte de la cuchilla de una clase. Esto se ha conseguido formando la superficie de flujo 23 de la cuchilla de lamina metalica a partir de un saliente asimetrico 24 en la seccion de la cuchilla 11. En otras palabras, la seccion de la cuchilla de la cuchilla rascadora es tan asimetrica que comprende un saliente distinto. Por lo tanto el soporte de la cuchilla puede ser colocado en una posicion normal utilizado de un modo normal.they require a support of a completely own class for them. Regardless of the application, the scraper blade according to the invention can be used for a blade holder of a kind. This has been achieved by forming the flow surface 23 of the metal sheet blade from an asymmetric protrusion 24 in the section of the blade 11. In other words, the section of the blade of the scraper blade is so asymmetrical that it comprises a different outgoing. Therefore the blade holder can be placed in a normal position used in a normal way.
Las dimensiones del saliente dependen en gran medida de las dimensiones de la cuchilla rascadora. Generalmente, la longitud efectiva de la superficie de flujo es aproximadamente la mitad del ancho de la cuchilla rascadora. Por ejemplo, en una cuchilla rascadora de 100 mm de ancho, la longitud efectiva t de la superficie de flujo 23 es 30 - 60 mm, mas ventajosamente 40 - 55 mm. La longitud efectiva tambien esta influida por el resto del diseno de la cuchilla rascadora. Segun la invencion, el saliente 24 forma una seccion de la cuchilla conformada en cuna 11, cuyo angulo a entre las superficies exteriores 25 y 26 es 10 - 30°, mas ventajosamente 15 - 20° (figura 2a). Generalmente, a medida que crece el angulo, se acorta la longitud efectiva. Sin embargo, este acortamiento se puede compensar mediante el diseno de la cuchilla rascadora.The dimensions of the projection depend largely on the dimensions of the scraper blade. Generally, the effective length of the flow surface is approximately half the width of the scraper blade. For example, in a scraper blade 100 mm wide, the effective length t of the flow surface 23 is 30-60 mm, more advantageously 40-55 mm. The effective length is also influenced by the rest of the scraper blade design. According to the invention, the projection 24 forms a section of the blade formed in cradle 11, whose angle to between the outer surfaces 25 and 26 is 10-30 °, more advantageously 15-20 ° (Figure 2a). Generally, as the angle grows, the effective length is shortened. However, this shortening can be compensated by the design of the scraper blade.
La cuchilla rascadora 10 de la figura 2a esta dimensionada considerando los soportes de cuchillas conocidos. En este caso el ancho de la cuchilla rascadora es en una clase de 100 mm, pero unas mas estrechas o mas anchas que esta tambien pueden ser fabricadas. Existe una gran libertad para el dimensionado del saliente, mientras que la seccion de retencion de fijacion debe ser suficientemente delgada como para ajustar en el espacio. En este caso el grosor mmimo de la cuchilla rascadora es aproximadamente 2,5 mm en cuyo caso se adecua a los soportes de cuchillas conocidos. La parte estrechada forma un cuello 28 el cual es simetrico junto con los rebordes 29. Por lo tanto la cuchilla rascadora se puede adaptar en el soporte de la cuchilla de dos modos diferentes mientras el soporte compuesto por los rebordes mantiene la cuchilla rascadora en el espacio. El ancho del area delgada es aproximadamente 25 mm, despues de lo cual el grosor de la cuchilla rascadora se incrementa por lo menos hasta cuatro milfmetros. Con este engrosamiento, se evita un plegado danino de la cuchilla rascadora.The scraper blade 10 of Figure 2a is sized considering the known blade holders. In this case the width of the scraper blade is in a class of 100 mm, but narrower or wider than this can also be manufactured. There is a great freedom for the projection sizing, while the fixing retention section must be thin enough to fit in the space. In this case, the minimum thickness of the scraper blade is approximately 2.5 mm, in which case it is suitable for known blade holders. The narrowed part forms a neck 28 which is symmetrical together with the flanges 29. Therefore the scraper blade can be adapted in the blade holder in two different ways while the support composed of the flanges keeps the scraper blade in space . The width of the thin area is approximately 25 mm, after which the thickness of the scraper blade is increased by at least up to four millimeters. With this thickening, a harmful folding of the scraper blade is avoided.
Ademas de la cuchilla rascadora novedosa, la instalacion de cuchillas segun la invencion tiene nuevas caractensticas. Segun la invencion, la seccion de la cuchilla es por lo tanto asimetrica en el plano de la seccion transversal mientras la seccion de retencion de fijacion es sustancialmente simetrica de modo que la cuchilla rascadora puede ser instalada mediante su seccion de retencion de fijacion en dos posiciones opuestas para proporcionar dos funciones diferentes. Ademas, en la primera funcion, la cuchilla rascadora 10 tiene principalmente una funcion de rascado y esta adaptada de modo que el angulo p entre la cuchilla rascadora 10 y la superficie 13 que se va a rascar es 6 - 16°, mas ventajosamente 10 -14° (figura 1). Entonces el angulo de la cuchilla formado es ventajosamente pequeno, por lo que se evita que la cuchilla rascadora muerda la superficie blanda. La tendencia al mordido tambien se reduce mediante la punta achaflanada anteriormente mencionada.In addition to the novel scraper blade, the installation of blades according to the invention has new features. According to the invention, the blade section is therefore asymmetric in the plane of the cross section while the fixing retention section is substantially symmetrical so that the scraper blade can be installed by its two-position fixing retention section. opposite to provide two different functions. In addition, in the first function, the scraper blade 10 mainly has a scratch function and is adapted so that the angle p between the scraper blade 10 and the surface 13 to be scratched is 6-16 °, more advantageously 10 - 14 ° (figure 1). Then the angle of the formed blade is advantageously small, whereby the scraper blade is prevented from biting the soft surface. The bite tendency is also reduced by the aforementioned chamfered tip.
En la segunda funcion de la instalacion de la cuchilla la cuchilla de lamina metalica esta adaptada de modo que el angulo y entre la cuchilla rascadora 10 y la superficie 13 que se va a rascar es 1 - 10°, mas ventajosamente 4 - 6° (figura 1). El espacio ligeramente creciente forma un efecto de vacfo eficaz. Al mismo tiempo, se forma un espacio para el agua entre la superficie de flujo y la superficie. De forma ventajosa, la instalacion rascadora esta colocada de tal modo que puede caer hacia abajo por gravedad desde la superficie de flujo. Rodillos de succion, por ejemplo estan provistos con cazuelas de recogida propias, mientras desde rodillos ranurados, el agua fluye a las cazuelas de la prensa y adicionalmente hacia el sistema de alcantarillado. El agua desprendida tambien puede ser rascada con otra cuchilla rascadora segun la invencion.In the second function of the installation of the blade the metal blade blade is adapted so that the angle and between the scraper blade 10 and the surface 13 to be scratched is 1-10 °, more advantageously 4-6 ° ( Figure 1). The slightly increasing space forms an effective vacuum effect. At the same time, a space is formed for the water between the flow surface and the surface. Advantageously, the scraper installation is positioned such that it can fall down by gravity from the flow surface. Suction rollers, for example, are provided with their own collection casseroles, while from grooved rollers, water flows to the press casseroles and additionally to the sewer system. The detached water can also be scratched with another scraper blade according to the invention.
Una cuchilla rascadora segun la invencion esta ventajosamente fabricada de material plastico de modo que la cuchilla rascadora puede ser utilizada para rascar superficies de rodillos blandos, bandas y bandas transportadoras. Existen diversos materiales plasticos posibles pero ventajosamente se utiliza polietileno o polipropileno de alta densidad o de baja densidad. La materia prima del producto final tiene un peso molecular alto y se utilizan aditivos de aleacion seleccionados en la fabricacion. Espedficamente, haciendo maximo el grado de polimerizacion y de saturacion de la materia prima con material graso seco y finalmente sinterizando y presionando, se consigue un producto final resistente al desgaste y ngido, el cual esta adicionalmente libre de tensiones y es estable en forma.A scraper blade according to the invention is advantageously made of plastic material so that the scraper blade can be used to scratch surfaces of soft rollers, belts and conveyor belts. There are several possible plastic materials but advantageously polyethylene or high density or low density polypropylene is used. The raw material of the final product has a high molecular weight and selected alloy additives are used in the manufacture. Specifically, maximizing the degree of polymerization and saturation of the raw material with dry fatty material and finally sintering and pressing, a final wear-resistant and nested product is achieved, which is additionally free of stress and is stable in shape.
Utilizando un material de este tipo, la cuchilla rascadora segun la invencion puede ser fabricada por mecanizado. El procedimiento de produccion tambien permite fabricar piezas largas. Por lo tanto la cuchilla rascadora completa es sin costuras. Cuando la cuchilla rascadora incluye una seccion de retencion de fijacion integral, son innecesarios los remachados separados.Using such a material, the scraper blade according to the invention can be manufactured by machining. The production procedure also allows to manufacture long pieces. Therefore the complete scraper blade is seamless. When the scraper blade includes an integral fixation retention section, separate rivets are unnecessary.
La figura 2b muestra la segunda forma de realizacion de la cuchilla rascadora 10 segun la invencion. El dimensionado y el perfilado corresponde a la forma de realizacion de la figura 2a excluyendo la superficie de flujo 23 de la cuchilla de lamina metalica. En este caso el saliente 24 esta formado con un ala 27. La construccion parcialmente abierta reduce la cantidad de materia prima y el diseno tambien es adecuado para la fabricacion por extrusion por estirado. La extrusion por estirado tambien permite fabricar un saliente hueco (no representado). Por otra parte, la cuchilla rascadora puede ser fabricada mediante la combinacion de varias piezas. Por ejemplo, un componente a modo de chaveta puede estar fijado a una pieza en tosco de la cuchilla en forma de cuna como unFigure 2b shows the second embodiment of the scraper blade 10 according to the invention. The sizing and profiling corresponds to the embodiment of Figure 2a excluding the flow surface 23 of the metal blade. In this case, the protrusion 24 is formed with a wing 27. The partially open construction reduces the amount of raw material and the design is also suitable for manufacturing by extrusion by stretching. Stretch extrusion also allows manufacturing a hollow projection (not shown). On the other hand, the scraper blade can be manufactured by combining several pieces. For example, a cotter-like component may be fixed to a rough piece of the cradle-shaped blade as a
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La figura 4 muestra una modificacion de la instalacion de la rascadora segun la invencion. En este caso la aplicabilidad universal de la cuchilla rascadora 10 se ilustra utilizando dos soportes de la cuchilla diferentes 15. Piezas funcionalmente similares estan referenciadas utilizando numeros de referencia identicos. La figura 4 muestra un denominado soporte de la cuchilla DST en el lado de la izquierda provisto de dos mangueras de carga 18. La cuchilla prensadora funcional 19 esta compuesta por una placa superior fijada al soporte 17. La figura 4 muestra un soporte de cuchilla denominado K 35 en el lado de la derecha el cual es ngido y tiene que ser fijado a la viga de la rascadora provista de elementos de carga (no representado). En este caso la cuchilla prensadora funcional 19 esta compuesta por la placa de fijacion 16 del soporte. Ademas de estos, la cuchilla rascadora segun la invencion tambien se adecua a otros tipos de soportes de la cuchilla, tales como el propio soporte de la cuchilla FiberDoc del solicitante, por ejemplo. Los soportes de la cuchilla tambien pueden estar provistos de una cuchilla prensadora. Ademas, el soporte de la cuchilla puede estar fabricado de un material compuesto o de metal.Figure 4 shows a modification of the installation of the scraper according to the invention. In this case the universal applicability of the scraper blade 10 is illustrated using two different blade holders 15. Functionally similar parts are referenced using identical reference numbers. Figure 4 shows a so-called DST blade holder on the left side provided with two loading hoses 18. The functional pressing blade 19 is composed of an upper plate fixed to the support 17. Figure 4 shows a knife holder called K 35 on the right side which is nested and has to be fixed to the scraper beam provided with load elements (not shown). In this case, the functional pressing blade 19 is composed of the fixing plate 16 of the support. In addition to these, the scraper blade according to the invention also fits other types of blade holders, such as the applicator's own FiberDoc blade holder, for example. The blade holders may also be provided with a pressing blade. In addition, the blade holder can be made of a composite or metal material.
La cuchilla rascadora segun la invencion es tan universal en el diseno que se puede adaptar a casi todos los soportes de cuchilla conocidos. Ademas, la funcion sorprendentemente dual cubre la mayona de las posiciones y requisitos de rascado. Simplemente girando la cuchilla rascadora, se proporciona tanto una cuchilla de rascado como una cuchilla de lamina metalica. En el caso en el que la posicion lo permita, una cuchilla rascadora que haya sido utilizada en una aplicacion de rascado se puede adaptar como una cuchilla de lamina metalica cuando este desgastada. Por otra parte, las presiones superficiales que se pueden aplicar son bajas y el material de la cuchilla es resistente al desgaste de modo que la cuchilla rascadora permanece operativa durante un largo tiempo. Con la cuchilla segun la invencion es posible reducir de forma remarcable el numero de diferentes cuchillas rascadoras en una maquina de malla de fibra. Ademas, una cuchilla rascadora novedosa se puede introducir en utilizacion sin mayores inversiones o cambios en el equipo.The scraper blade according to the invention is so universal in design that it can be adapted to almost all known blade holders. In addition, the surprisingly dual function covers the majority of scratch positions and requirements. Simply by turning the scraper blade, both a scraper blade and a metal blade are provided. In the case where the position allows, a scraper blade that has been used in a scraping application can be adapted as a metal blade when worn. On the other hand, the surface pressures that can be applied are low and the blade material is wear resistant so that the scraper blade remains operative for a long time. With the blade according to the invention it is possible to reduce remarkably the number of different scraper blades in a fiber mesh machine. In addition, a novel scraper blade can be introduced into use without major investments or changes in the equipment.
Claims (5)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI20096312A FI121853B (en) | 2009-12-11 | 2009-12-11 | Scraper blade for fiber web machine and scraper assembly in fiber web machine |
| FI20096312 | 2009-12-11 | ||
| PCT/FI2010/050966 WO2011070229A1 (en) | 2009-12-11 | 2010-11-26 | Doctor blade for a fiber web machine and doctor arrangement in a fiber web machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ES2580205T3 true ES2580205T3 (en) | 2016-08-22 |
Family
ID=41462776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ES10835547.0T Active ES2580205T3 (en) | 2009-12-11 | 2010-11-26 | Scraper blade for a fiber mesh machine and installation of the scraper in a fiber mesh machine |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP2510152B1 (en) |
| CN (1) | CN102652197B (en) |
| DE (1) | DE202010018268U1 (en) |
| ES (1) | ES2580205T3 (en) |
| FI (1) | FI121853B (en) |
| WO (1) | WO2011070229A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8771473B2 (en) | 2009-12-11 | 2014-07-08 | Valmet Technologies, Inc. | Doctor blade for a fiber web machine and doctor arrangement in a fiber web machine |
| ES1075921Y (en) * | 2011-10-26 | 2012-03-29 | Grafometal S A | Scraper blade |
| CN105641999B (en) * | 2016-03-16 | 2017-09-22 | 柳州市杰特建材有限责任公司 | Natural-dehydration case and collection slurry processes dewatering system |
| CN105639779B (en) * | 2016-03-23 | 2018-03-23 | 杭州奥科服装辅料有限公司 | A kind of adhesion lining cloth and its production technology |
| CN106493437A (en) * | 2016-12-29 | 2017-03-15 | 泰州前进科技有限公司 | A kind of scraper |
| US20210316329A1 (en) * | 2018-08-31 | 2021-10-14 | Kadant Inc. | Doctor blade with polymeric retention means, doctor blade holder comprising such a doctor blade and method for providing retention means on a doctor blade |
| AT526290A1 (en) * | 2022-07-13 | 2024-01-15 | Voith Patent Gmbh | Scraper holder and scraper device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4184429A (en) * | 1972-02-09 | 1980-01-22 | Max Datwyler & Co. | Constant bevel doctor blade and method and apparatus using same |
| US5520731A (en) * | 1990-10-20 | 1996-05-28 | Zanders Feinpapiere Ag | Doctor blade for use in coating continuous strips of material or similar substrates |
| FI114328B (en) * | 2003-01-30 | 2004-09-30 | Metso Paper Inc | Composite construction treatment plant |
| US20040149414A1 (en) * | 2003-01-31 | 2004-08-05 | Watson Robert Bradley | Apparatus for removing liquid from a press roll sleeve or belt on a paper making machine |
| FI20065573A0 (en) * | 2006-09-20 | 2006-09-20 | Ike Service Oy | Blade and method of making the blade |
| WO2008037850A1 (en) * | 2006-09-27 | 2008-04-03 | Metso Paper, Inc. | Method of manufacturing a doctor blade, a doctor blade and a blade holder |
-
2009
- 2009-12-11 FI FI20096312A patent/FI121853B/en active IP Right Grant
-
2010
- 2010-11-26 CN CN201080056039.5A patent/CN102652197B/en active Active
- 2010-11-26 DE DE201020018268 patent/DE202010018268U1/en not_active Expired - Lifetime
- 2010-11-26 ES ES10835547.0T patent/ES2580205T3/en active Active
- 2010-11-26 EP EP10835547.0A patent/EP2510152B1/en active Active
- 2010-11-26 WO PCT/FI2010/050966 patent/WO2011070229A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| EP2510152B1 (en) | 2016-05-11 |
| EP2510152A1 (en) | 2012-10-17 |
| DE202010018268U1 (en) | 2015-03-25 |
| CN102652197B (en) | 2015-10-14 |
| WO2011070229A1 (en) | 2011-06-16 |
| FI121853B (en) | 2011-05-13 |
| EP2510152A4 (en) | 2013-05-01 |
| FI20096312A0 (en) | 2009-12-11 |
| CN102652197A (en) | 2012-08-29 |
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