WO2003020620A1 - Supporting roller for an open conveyor belt and the use thereof - Google Patents

Supporting roller for an open conveyor belt and the use thereof Download PDF

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Publication number
WO2003020620A1
WO2003020620A1 PCT/ES2002/000414 ES0200414W WO03020620A1 WO 2003020620 A1 WO2003020620 A1 WO 2003020620A1 ES 0200414 W ES0200414 W ES 0200414W WO 03020620 A1 WO03020620 A1 WO 03020620A1
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WO
WIPO (PCT)
Prior art keywords
support roller
roller according
bearing
cylindrical housing
rotation
Prior art date
Application number
PCT/ES2002/000414
Other languages
Spanish (es)
French (fr)
Inventor
Octavi Puigdollers Segura
Original Assignee
Bezanmetal S.L.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bezanmetal S.L. filed Critical Bezanmetal S.L.
Publication of WO2003020620A1 publication Critical patent/WO2003020620A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors 
    • B65G39/10—Arrangements of rollers
    • B65G39/12—Arrangements of rollers mounted on framework
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G39/00—Rollers, e.g. drive rollers, or arrangements thereof incorporated in roller-ways or other types of mechanical conveyors 
    • B65G39/02—Adaptations of individual rollers and supports therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • F16C13/02—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/20—Sliding surface consisting mainly of plastics
    • F16C33/201—Composition of the plastic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft

Definitions

  • the invention relates to a support roller for opencast conveyor belt comprising a cylindrical housing, at least one bearing and at least one axis of rotation.
  • the invention also makes reference to preferred uses of a roller according to the invention.
  • conveyor belts are used to transport material.
  • These conveyor belts usually have support rollers on which the belt rests.
  • These support rollers have a metal cylindrical housing and can freely rotate around their geometric axis, for which they usually have a conventional metal bearing (for example a ball bearing) at each end of the cylindrical housing and an axis of coaxial rotation with the geometric axis of the housing that crosses the entire housing and that rests on the two bearings.
  • These rollers usually present a series of inconveniences when they are used in more or less aggressive environments, in particular in the open air or open sky, as well as in environments with dirt and / or dust.
  • the bearings oxidize and get stuck, stopping spinning. This presents problems of noise and wear of the tape, when it touches the surface of the metal housing. This forces frequent maintenance work. Summary of the invention
  • the object of the invention is to overcome these drawbacks.
  • This purpose is achieved by means of a support roller for open conveyor belts characterized in that the cylindrical housing is made of reinforced plastic material, and the bearing (s) are made of thermoplastic material (for example polypropylene) with an addition of a solid lubricant.
  • This addition is preferably molybdenum bisulfide and is preferably between 30% and 70% by weight, although other solid lubricants, such as graphite, are also possible.
  • the thermoplastic material used in the manufacture of the bearing can be PTFE, PEEK (polyether ether ketone) or polyamide. These materials have good mechanical properties, combined with good resistance to high temperatures and good chemical resistance.
  • rollers according to the invention do not have rust problems, do not present noise problems, have a lower weight, and their cost can be 50% lower than an equivalent metal roller.
  • thermoplastic material bearings with a solid lubricant such as the aforementioned molybdenum bisulphide
  • thermoplastic material bearings with molybdenum bisulfide are resistant to high temperatures, so they do not deform, as is the case when trying to use nylon bearings.
  • the reinforced plastic material of the housing is an electrostatic material.
  • these rollers are usually used in more or less aggressive environments, often with dirt and / or dust. In this sense it is common for the powder to adhere, by electrostatic forces, to the roller, which accelerates its aging.
  • the reinforced plastic material that forms the cylindrical housing is an electrostatic material substantially reduces the amount of dust and particles adhering on the roller and, therefore, lengthens the life of the same.
  • the cylindrical housing is made of a polyolefin (advantageously polypropylene) reinforced with fiberglass, which has good electrostatic properties.
  • the housing of reinforced plastic material is of a polyolefin, preferably polypropylene, reinforced with fiberglass lies in the fact that, in this way, In the event that the roller stops rotating for any incident, the wear of the conveyor belt when rubbing with the housing is much less.
  • the roller can have a rotation axis that crosses the entire interior of the cylindrical housing, but preferably the roller has two coaxial rotation axes, each of which rests on one of the bearings of thermoplastic material with bisulfide Molybdenum This saves weight and material cost.
  • the cylindrical housing has an external surface of low coefficient of friction. This is preferably achieved by coating the cylindrical shell with hard petroleum jelly or PTFE (Teflon®). It should be taken into account that during the operation of the roller, it rotates on its axis at the same time that a conveyor belt moves over it. Ideally, the translation speed of the conveyor belt and the speed of rotation of the roller are synchronized, so that there is no relative movement between them. However, in practice this relative movement is usually present (to a greater or lesser degree) which causes friction forces. By coating the cylindrical housing of a material with a low coefficient of friction, these friction forces are reduced, which results in a lower drag effort and a longer service life of all components.
  • PTFE Teflon®
  • the cylindrical housing with an external surface of high wear resistance.
  • this is achieved by providing the cylindrical shell with a coating of synthetic elastomer, rubber or rubber.
  • a synthetic elastomer, rubber or rubber coating promotes the rotation of the support roller.
  • Another additional improvement consists in giving a boron nitride or hard chromium coating to the axis of rotation.
  • the axis of rotation is normally metallic, for example of iron. Hence the axis of rotation should have a life much greater than that of the bearing or the cylindrical housing. However, in certain cases the axis of metal rotation can deteriorate more quickly than the rest of the roller components. Effectively in the aggressive environments mentioned above - TO -
  • a particle of high hardness is lodged between the bearing and the axis of rotation.
  • this high hardness particle must be housed inside the thermoplastic mass of the bearing.
  • this hard particle may remain in contact with the axis of rotation and cause high wear on it, until it causes failure. Therefore, a surface coating that increases the hardness of the rotation axis, such as a boron nitride or hard chromium coating, can be an advantage of interest.
  • the support roller has at least one axial bearing that rests on the internal surface (that is, the surface facing the interior of the support roller) of the thermoplastic material bearing.
  • the thermoplastic material bearing has a capacity to withstand limited axial stresses. By adding an axial bearing, the ability to withstand axial stresses can be significantly improved.
  • the axial bearing is arranged inside the support roller, resting on the inner surface of the thermoplastic material bearing.
  • the thermoplastic material bearing may be provided with some extension or skirt which protrudes from its internal surface and partially envelops the axial bearing, thus protecting it further from the surroundings.
  • the support rollers according to the invention are used in open-air installations and / or in more or less aggressive environments (high humidity, more or less corrosive environments, such as marine environments, environments with more or less abrasive powders, etc. .), such as port facilities, quarries and mines.
  • Fig. 1 a cross-sectional view of a first roller according to the invention.
  • Fig. 2 a cross-sectional view of a second roller according to the invention.
  • Fig. 3 a view of a partial cross section of a third roller according to the invention.
  • Fig. 4 a view of a partial cross section of the roller of Fig. 3 with a grease nipple.
  • the support roller of Fig. 1 has a cylindrical shell 1 made of glass fiber reinforced polypropylene.
  • a bearing 3 of thermoplastic material with molybdenum bisulfide.
  • the bearing 3 is fixed to the housing 1 by any suitable means, for example, by means of screws.
  • Each of the bearings 3 has a central through hole, both coaxial holes being with each other.
  • a turning shaft 5 is housed in each hole, with an external end 7 suitable for being fixed to an external support structure.
  • the turning shafts 5 are made of stainless steel, preferably with a boron nitride or hard chrome coating.
  • Each of the pivot axes 5 has an internal end 9 with a larger diameter.
  • Molybdenum bisulfide has good properties as a lubricating material, as well as adequate mechanical and heat resistance characteristics. In this way weight savings are achieved, the elimination of jamming problems (iron bearings, such as conventional ball bearings, are frequently clogged by problems of oxides and / or surplus / dust) and the elimination of noise problems
  • the plastic housing also has advantages, since the problems of oxides, noise, premature wear of the conveyor belt disappear, and significant weight savings are achieved.
  • the support roller according to the invention also supposes an important saving in costs, both manufacturing and maintenance.
  • Fig. 2 a variant of support roller is shown, in which the axis of rotation 5a is a single through axis that crosses both holes of both bearings 3.
  • Fig. 3 Another embodiment of the invention is shown in Fig. 3.
  • the bearing 3 does not extend from the axis of rotation 5 to the housing 1, but between the housing 1 and the bearing 3 there is a support 15, made of thermoplastic material.
  • the support 15 allows, on the one hand, to reduce the size of the bearing 3 (with the consequent cost savings) and, on the other hand, to achieve a better dimensional stability.
  • the roller of Fig. 3 also has an axial bearing 17, fixed with a support ring 19.
  • the axial bearing 17 allows greater axial stresses to be absorbed, and has a lubricating retainer 21 which allows the axial bearing 17 to be properly lubricated.
  • FIG. 4 A variant of the roller of Fig. 3 is shown in Fig. 4.
  • the pivot shaft 5 has a lubrication duct 23 extending from the outer end 7 of the pivot shaft 5 to an intermediate point of the contact surface between the axis of rotation 5 and the bearing 3 of thermoplastic material.
  • a greaser 25 closes the open end of the lubrication duct 23.
  • the greaser 25 can be any conventional greaser, for example a greaser formed by a housing 27 inside which a closing ball 29 and a spring 31 are housed. of embodiment presented in Fig. 4 further improves the performance of the roller of the invention, since the performance of a liquid lubricant that is injected into the lubrication line is added to the lubricant properties of the solid lubricant included in the bearing 3 23 through the oiler 25.

Abstract

The invention relates to a supporting roller for an open conveyor belt and the use thereof. The inventive supporting roller comprises a cylindrical frame, two bearings and at least one rotation shaft. Said cylindrical frame is made from reinforced plastic, preferably with good anti-electrostatic properties, and advantageously from glass-fibre-reinforced polypropylene. The aforementioned bearing is made from a thermoplastic material with the addition of a solid lubricant, such as molybdenum disulphide, preferably of between 30 wt.- % and 70 wt.- %. Advantageously, the cylindrical frame is provided with an external surface having a low coefficient of friction and/or high wear resistance. The rotation shaft can be covered with hard chromium or boron nitride and the cylindrical frame can be filled with a filling material. The inventive roller is preferably used in harbour installations, quarries and mines and/or in the food sector.

Description

RODILLO DE SOPORTE PARA CINTA TRANSPORTADORA A CIELO ABIERTO YSUPPORT ROLLER FOR OPEN AND SKY CONVEYOR BELT
UTILIZACIÓN CORRESPONDIENTECORRESPONDING USE
DESCRIPCIÓNDESCRIPTION
Campo de la invenciónField of the Invention
La invención se refiere a un rodillo de soporte para cinta transportadora a cielo abierto que comprende una carcasa cilindrica, por lo menos un cojinete y por lo menos un eje de giro. La invención hace referencia asimismo a unas utilizaciones preferentes de un rodillo de acuerdo con la invención.The invention relates to a support roller for opencast conveyor belt comprising a cylindrical housing, at least one bearing and at least one axis of rotation. The invention also makes reference to preferred uses of a roller according to the invention.
Estado de la técnicaState of the art
En multitud de instalaciones se emplean cintas transportadoras para el transporte de material. Estas cintas transportadoras suelen disponer de unos rodillos de soporte sobre los que descansa la cinta. Estos rodillos de soporte tienen una carcasa cilindrica metálica y pueden girar libremente alrededor de su eje geométrico para lo que suelen disponer de un cojinete metálico convencional (por ejemplo un cojinete a bolas) en cada uno de los extremos de la carcasa cilindrica y un eje de giro coaxial con el eje geométrico de la carcasa que atraviesa toda la carcasa y que se apoya sobre los dos cojinetes. Estos rodillos suelen presentar una serie de inconvenientes cuando son empleados en ambientes más o menos agresivos, en particular en la intemperie o cielo abierto, así como en ambientes con suciedad y/o polvo. Los cojinetes se oxidan y se atascan, dejando de girar. Ello presenta problemas de ruidos y de desgaste de la cinta, al rozar esta con la superficie de la carcasa metálica. Ello obliga a frecuentes trabajos de mantenimiento. Sumario de la invenciónIn many installations, conveyor belts are used to transport material. These conveyor belts usually have support rollers on which the belt rests. These support rollers have a metal cylindrical housing and can freely rotate around their geometric axis, for which they usually have a conventional metal bearing (for example a ball bearing) at each end of the cylindrical housing and an axis of coaxial rotation with the geometric axis of the housing that crosses the entire housing and that rests on the two bearings. These rollers usually present a series of inconveniences when they are used in more or less aggressive environments, in particular in the open air or open sky, as well as in environments with dirt and / or dust. The bearings oxidize and get stuck, stopping spinning. This presents problems of noise and wear of the tape, when it touches the surface of the metal housing. This forces frequent maintenance work. Summary of the invention
La invención tiene por objeto superar estos inconvenientes. Esta finalidad se consigue mediante un rodillo de soporte para cintas transportadoras a cielo abierto caracterizado porque la carcasa cilindrica es de material plástico reforzado, y el o los cojinetes son de material termoplástico (por ejemplo polipropileno) con una adición de un lubricante sólido. Esta adición es preferentemente de bisulfuro de molib- deno y está comprendida preferentemente entre el 30% y el 70% en peso, si bien también son posibles otros lubricantes sólidos, como el grafito. El material termo- plástico empleado en la fabricación del cojinete puede ser PTFE, PEEK (poli- eteretercetona) o poliamida. Estos materiales presentan unas buenas propiedades mecánicas, combinadas con una buena resistencia a las altas temperaturas y una buena resistencia química.The object of the invention is to overcome these drawbacks. This purpose is achieved by means of a support roller for open conveyor belts characterized in that the cylindrical housing is made of reinforced plastic material, and the bearing (s) are made of thermoplastic material (for example polypropylene) with an addition of a solid lubricant. This addition is preferably molybdenum bisulfide and is preferably between 30% and 70% by weight, although other solid lubricants, such as graphite, are also possible. The thermoplastic material used in the manufacture of the bearing can be PTFE, PEEK (polyether ether ketone) or polyamide. These materials have good mechanical properties, combined with good resistance to high temperatures and good chemical resistance.
Efectivamente, los rodillos de acuerdo con la invención no presentan pro- blemas de óxido, no presentan problemas de ruido, tienen un peso más reducido, y su coste puede ser un 50% más reducido que un rodillo equivalente metálico.Indeed, the rollers according to the invention do not have rust problems, do not present noise problems, have a lower weight, and their cost can be 50% lower than an equivalent metal roller.
Los cojinetes de material termoplástico con un lubricante sólido (como el ya citado bisulfuro de molibdeno) suplen perfectamente a los cojinetes a bolas metálicos sin los problemas anteriormente mencionados. Además, los cojinetes de mate- rial termoplástico con bisulfuro de molibdeno son resistentes a las altas temperaturas, por lo que no se deforman, como ocurre al intentar emplear cojinetes de nylon. Preferentemente el material plástico reforzado de la carcasa es un material antielectrostático. Efectivamente, estos rodillos suelen ser empleados en ambientes más o menos agresivos, frecuentemente con suciedad y/o polvo. En este sentido es frecuente que el polvo se adhiera, por fuerzas electrostáticas, al rodillo, lo que acelera su envejecimiento. Por lo tanto, el hecho de que el material plástico reforzado que conforma la carcasa cilindrica sea un material antielectrostático reduce subs- tancialmente la cantidad de polvo y partículas que se adhieren sobre el rodillo y, por tanto, se alarga la vida útil del mismo. Preferentemente la carcasa cilindrica es de una poliolefina (ventajosamente polipropileno) reforzada con fibra de vidrio, que presenta unas buenas propiedades antielectrostáticas. Otra de las ventajas de que la carcasa de material plástico reforzado sea de una poliolefina, preferentemente polipropileno, reforzada con fibra de vidrio radica en el hecho que, de esta manera, en el caso que el rodillo deje de girar por cualquier incidencia, el desgaste de la cinta transportadora al rozar con la carcasa es mucho menor.The bearings made of thermoplastic material with a solid lubricant (such as the aforementioned molybdenum bisulphide) perfectly replace metal ball bearings without the aforementioned problems. In addition, thermoplastic material bearings with molybdenum bisulfide are resistant to high temperatures, so they do not deform, as is the case when trying to use nylon bearings. Preferably the reinforced plastic material of the housing is an electrostatic material. Indeed, these rollers are usually used in more or less aggressive environments, often with dirt and / or dust. In this sense it is common for the powder to adhere, by electrostatic forces, to the roller, which accelerates its aging. Therefore, the fact that the reinforced plastic material that forms the cylindrical housing is an electrostatic material substantially reduces the amount of dust and particles adhering on the roller and, therefore, lengthens the life of the same. Preferably the cylindrical housing is made of a polyolefin (advantageously polypropylene) reinforced with fiberglass, which has good electrostatic properties. Another advantage that the housing of reinforced plastic material is of a polyolefin, preferably polypropylene, reinforced with fiberglass lies in the fact that, in this way, In the event that the roller stops rotating for any incident, the wear of the conveyor belt when rubbing with the housing is much less.
El rodillo puede disponer de un eje de giro que atraviese todo el interior de la carcasa cilindrica, pero preferentemente el rodillo dispone de dos ejes de giro coa- xiales, cada uno de los cuales se apoya sobre uno de los cojinetes de material termoplástico con bisulfuro de molibdeno. De esta manera se ahorra peso y coste de material.The roller can have a rotation axis that crosses the entire interior of the cylindrical housing, but preferably the roller has two coaxial rotation axes, each of which rests on one of the bearings of thermoplastic material with bisulfide Molybdenum This saves weight and material cost.
Otra mejora adicional consiste en que la carcasa cilindrica presente una superficie externa de bajo coeficiente de fricción. Ello se consigue preferentemente recubriendo la carcasa cilindrica con vaselina dura o PTFE (teflón®). Debe tenerse en cuenta que durante el funcionamiento del rodillo, éste va girando sobre su eje al mismo tiempo que una cinta transportadora se desplaza por encima de él. En condiciones ideales la velocidad de traslación de la cinta transportadora y la velocidad de giro del rodillo están sincronizadas, de manera que no hay un movimiento relati- vo entre ambos. Sin embargo en la práctica este m.ovimiento relativo suele estar presente (en mayor o menor grado) lo que provoca unas fuerzas de rozamiento. Al recubrir la carcasa cilindrica de un material de bajo coeficiente de fricción se reducen estas fuerzas de rozamiento, lo que se traduce en un menor esfuerzo de arrastre y en una mayor vida útil de todos los componentes. Alternativamente es posible dotar a la carcasa cilindrica de una superficie externa de elevada resistencia al desgaste. Preferentemente ello se consigue dotando la carcasa cilindrica de un recubrimiento de elastómero sintético, goma o caucho. Efectivamente, en este caso, aunque exista un movimiento relativo entre la carcasa cilindrica y la cinta transportadora, el deterioro de la carcasa cilindrica se ve reducido gracias a la presencia de la superficie externa de elevada resistencia al desgaste. Asimismo la existencia de un recubrimiento de elastómero sintético, goma o caucho promueve el giro del rodillo de soporte.A further improvement is that the cylindrical housing has an external surface of low coefficient of friction. This is preferably achieved by coating the cylindrical shell with hard petroleum jelly or PTFE (Teflon®). It should be taken into account that during the operation of the roller, it rotates on its axis at the same time that a conveyor belt moves over it. Ideally, the translation speed of the conveyor belt and the speed of rotation of the roller are synchronized, so that there is no relative movement between them. However, in practice this relative movement is usually present (to a greater or lesser degree) which causes friction forces. By coating the cylindrical housing of a material with a low coefficient of friction, these friction forces are reduced, which results in a lower drag effort and a longer service life of all components. Alternatively it is possible to provide the cylindrical housing with an external surface of high wear resistance. Preferably, this is achieved by providing the cylindrical shell with a coating of synthetic elastomer, rubber or rubber. Indeed, in this case, although there is a relative movement between the cylindrical casing and the conveyor belt, the deterioration of the cylindrical casing is reduced thanks to the presence of the external surface of high wear resistance. Likewise, the existence of a synthetic elastomer, rubber or rubber coating promotes the rotation of the support roller.
Otra mejora adicional consiste en darle un recubrimiento de nitruro de boro o de cromo duro al eje de giro. El eje de giro es normalmente metálico, por ejemplo de hierro. Aparentemente el eje de giro debería tener una vida útil muy superior a la del cojinete o de la carcasa cilindrica. Sin embargo en determinados casos puede deteriorarse más rápidamente el eje de giro metálico que el resto de los componentes del rodillo. Efectivamente en los ambientes agresivos citados anteriormente - A -Another additional improvement consists in giving a boron nitride or hard chromium coating to the axis of rotation. The axis of rotation is normally metallic, for example of iron. Apparently the axis of rotation should have a life much greater than that of the bearing or the cylindrical housing. However, in certain cases the axis of metal rotation can deteriorate more quickly than the rest of the roller components. Effectively in the aggressive environments mentioned above - TO -
puede darse la circunstancia que una partícula de elevada dureza se aloje entre el cojinete y el eje de giro. Usualmente esta partícula de elevada dureza debe quedar alojada en el interior de la masa termoplástica del cojinete. Sin embargo, en determinadas circunstancias, esta partícula dura puede quedar en contacto con el eje de giro y ocasionar un elevado desgaste sobre el mismo, hasta provocar su fallo. Por ello un recubrimiento superficial que incremente la dureza del eje de giro, como por ejemplo un recubrimiento de nitruro de boro o de cromo duro, puede resultar una ventaja de interés.it may be the case that a particle of high hardness is lodged between the bearing and the axis of rotation. Usually this high hardness particle must be housed inside the thermoplastic mass of the bearing. However, under certain circumstances, this hard particle may remain in contact with the axis of rotation and cause high wear on it, until it causes failure. Therefore, a surface coating that increases the hardness of the rotation axis, such as a boron nitride or hard chromium coating, can be an advantage of interest.
A pesar de las mejoras anteriores en algunos casos el desgaste de la caréasa cilindrica es inevitable y se llega a la circunstancia en la que la carcasa cilindrica se perfora. Ello puede llevar rápidamente a un paro de la cinta transportadora. Por ello puede ser una ventaja de interés el rellenar la carcasa cilindrica de un material de relleno, como por ejemplo de elastómero sintético, goma o de una espuma plástica. De esta manera se alarga la vida útil del rodillo de soporte, lo que puede per- mitir su substitución antes de que tenga lugar un paro en la cinta transportadora.In spite of the previous improvements in some cases the wear of the cylindrical shaft is inevitable and the circumstance in which the cylindrical housing is perforated is reached. This can quickly lead to a stop of the conveyor belt. Therefore, it may be an advantage of interest to fill the cylindrical housing of a filler material, such as synthetic elastomer, rubber or a plastic foam. In this way, the life of the support roller is extended, which may allow its replacement before a stoppage in the conveyor belt takes place.
Ventajosamente el rodillo de soporte tiene por lo menos un cojinete axial que se apoya sobre la superficie interna (es decir, la superficie que queda encarada hacia el interior del rodillo de soporte) del cojinete de material termoplástico. Efectivamente, el cojinete de material termoplástico tiene una capacidad de soportar es- fuerzos axiales limitada. Al añadirle un cojinete axial se puede mejorar notablemente la capacidad de soportar esfuerzos axiales. Para evitar que el cojinete axial sufra de las agresiones del entorno es ventajoso que el cojinete axial esté dispuesto en el interior del rodillo de soporte, apoyándose sobre la superficie interna del cojinete de material termoplástico. Preferentemente se puede dotar al cojinete de mate- rial termoplástico de alguna prolongación o faldilla que sobresalga de su superficie interna y que envuelva parcialmente el cojinete axial, protegiéndolo así aún más del entorno.Advantageously, the support roller has at least one axial bearing that rests on the internal surface (that is, the surface facing the interior of the support roller) of the thermoplastic material bearing. Indeed, the thermoplastic material bearing has a capacity to withstand limited axial stresses. By adding an axial bearing, the ability to withstand axial stresses can be significantly improved. To prevent the axial bearing from suffering from environmental aggressions, it is advantageous that the axial bearing is arranged inside the support roller, resting on the inner surface of the thermoplastic material bearing. Preferably, the thermoplastic material bearing may be provided with some extension or skirt which protrudes from its internal surface and partially envelops the axial bearing, thus protecting it further from the surroundings.
La introducción de las mejoras anteriores en particular el hecho de cubrir el eje de giro con un recubrimiento de nitruro de boro o de cromo duro permite obtener unos rodillos de soporte aptos para ser empleados en el sector de la alimentación, ya que se evita cualquier posible fuente de contaminación metálica procedente del eje de giro. Preferentemente se utilizan los rodillos de soporte de acuerdo con la invención en instalaciones a cielo abierto y/o en ambientes más o menos agresivos (alta humedad, ambientes más o menos corrosivos, como los ambientes marinos, ambientes con polvos más o menos abrasivos, etc.), como por ejemplo las instalacio- nes portuarias, canteras y minas.The introduction of the previous improvements, in particular the fact of covering the axis of rotation with a coating of boron nitride or hard chromium allows to obtain support rollers suitable for use in the food sector, since any possible source of metal contamination from the axis of rotation. Preferably, the support rollers according to the invention are used in open-air installations and / or in more or less aggressive environments (high humidity, more or less corrosive environments, such as marine environments, environments with more or less abrasive powders, etc. .), such as port facilities, quarries and mines.
Breve descripción de los dibujosBrief description of the drawings
Otras ventajas y características de la invención se aprecian a partir de la siguíente descripción, en la que, sin ningún carácter limitativo, se relata unos modos preferentes de realización de la invención, haciendo mención de los dibujos que se acompañan. Las figuras muestran:Other advantages and features of the invention can be seen from the following description, in which, without any limitation, preferred embodiments of the invention are mentioned, mentioning the accompanying drawings. The figures show:
Fig. 1 , una vista de una sección transversal de un primer rodillo de acuerdo con la invención.Fig. 1, a cross-sectional view of a first roller according to the invention.
Fig. 2, una vista de una sección transversal de un segundo rodillo de acuerdo con la invención.Fig. 2, a cross-sectional view of a second roller according to the invention.
Fig. 3, una vista de una sección transversal parcial de un tercer rodillo de acuerdo con la invención. Fig. 4, una vista de una sección transversal parcial del rodillo de la Fig. 3 con un engrasador.Fig. 3, a view of a partial cross section of a third roller according to the invention. Fig. 4, a view of a partial cross section of the roller of Fig. 3 with a grease nipple.
Descripción detallada de unas formas de realización de la invenciónDetailed description of embodiments of the invention
El rodillo de soporte de la Fig. 1 dispone de una carcasa 1 cilindrica de polipropileno reforzado con fibra de vidrio. En cada uno de los extremos de la carcasa 1 hay un cojinete 3 de material termoplástico con bisulfuro de molibdeno. El cojinete 3 está fijado a la carcasa 1 por cualquier medio adecuado, por ejemplo, mediante unos tornillos. Cada uno de los cojinetes 3 presenta un orificio central pasante, siendo ambos orificios coaxiales entre sí. En cada orificio se aloja un eje de giro 5, con un extremo externo 7 apto para ser fijado a una estructura exterior de soporte. Los ejes de giro 5 son de acero inoxidable, preferentemente con un recubrimiento de nitruro de boro o de cromo duro. Cada uno de los ejes de giro 5 presenta un extremo interno 9 con un diámetro mayorado. Por el lado externo de cojinete 3, el eje de giro 5 se fija mediante un anillo de retención 11 que se aloja en una ranura dispuesta en el eje de giro 5. Un guardapolvo 13 evita la entrada de polvo y suciedad en el cojinete 3. El bisulfuro de molibdeno tiene unas buenas propiedades como material lubricante, así como unas adecuadas características mecánicas y de resistencia al calor. De esta manera se alcanza un ahorro de peso, la eliminación de problemas de atascos (los cojinetes de hierro, como por ejemplo los cojinetes de bolas convencionales, se atascan frecuentemente por problemas de óxidos y/o de súdedad/polvo) y la eliminación de problemas de ruidos.The support roller of Fig. 1 has a cylindrical shell 1 made of glass fiber reinforced polypropylene. At each end of the housing 1 there is a bearing 3 of thermoplastic material with molybdenum bisulfide. The bearing 3 is fixed to the housing 1 by any suitable means, for example, by means of screws. Each of the bearings 3 has a central through hole, both coaxial holes being with each other. A turning shaft 5 is housed in each hole, with an external end 7 suitable for being fixed to an external support structure. The turning shafts 5 are made of stainless steel, preferably with a boron nitride or hard chrome coating. Each of the pivot axes 5 has an internal end 9 with a larger diameter. On the external bearing side 3, the rotation axis 5 is fixed by a retaining ring 11 that is housed in a groove arranged on the rotation axis 5. A dust cover 13 prevents the entry of dust and dirt into the bearing 3. Molybdenum bisulfide has good properties as a lubricating material, as well as adequate mechanical and heat resistance characteristics. In this way weight savings are achieved, the elimination of jamming problems (iron bearings, such as conventional ball bearings, are frequently clogged by problems of oxides and / or surplus / dust) and the elimination of noise problems
La carcasa de material plástico presenta asimismo ventajas, ya que desaparecen los problemas de óxidos, de ruidos, de desgaste prematuro de la cinta transportadora, y se consigue un ahorro importante de peso.The plastic housing also has advantages, since the problems of oxides, noise, premature wear of the conveyor belt disappear, and significant weight savings are achieved.
El rodillo de soporte de acuerdo con la invención supone asimismo un aho- rro importante en los costes, tanto de fabricación como de mantenimiento.The support roller according to the invention also supposes an important saving in costs, both manufacturing and maintenance.
En la Fig. 2 se aprecia una variante de rodillo de soporte, en el que el eje de giro 5a es un único eje pasante que atraviesa ambos orificios de ambos cojinetes 3.In Fig. 2 a variant of support roller is shown, in which the axis of rotation 5a is a single through axis that crosses both holes of both bearings 3.
En la Fig. 3 se muestra otra forma de realización de la invención. En este caso el cojinete 3 no se extiende desde el eje de giro 5 hasta la carcasa 1 sino que entre la carcasa 1 y el cojinete 3 hay un soporte 15, de material termoplástico. El soporte 15 permite, por un lado, reducir el tamaño del cojinete 3 (con el consiguiente ahorro en coste) y, por otro lado, conseguir una estabilidad dimensional mejor. El rodillo de la Fig. 3 dispone asimismo de un cojinete axial 17, fijado con un aro de soporte 19. El cojinete axial 17 permite absorber esfuerzos axiales mayores, y tiene un retén lubrificante 21 que permite tener el cojinete axial 17 adecuadamente lubrificado.Another embodiment of the invention is shown in Fig. 3. In this case, the bearing 3 does not extend from the axis of rotation 5 to the housing 1, but between the housing 1 and the bearing 3 there is a support 15, made of thermoplastic material. The support 15 allows, on the one hand, to reduce the size of the bearing 3 (with the consequent cost savings) and, on the other hand, to achieve a better dimensional stability. The roller of Fig. 3 also has an axial bearing 17, fixed with a support ring 19. The axial bearing 17 allows greater axial stresses to be absorbed, and has a lubricating retainer 21 which allows the axial bearing 17 to be properly lubricated.
En la Fig. 4 se muestra una variante del rodillo de la Fig. 3. En este caso, el eje de giro 5 tiene un conducto de lubricación 23 que se extiende desde el extremo externo 7 del eje de giro 5 hasta un punto intermedio de la superficie de contacto entre el eje de giro 5 y el cojinete 3 de material termoplástico. Un engrasador 25 cierra el extremo abierto del conducto de lubricación 23. El engrasador 25 puede ser cualquier engrasador convencional, por ejemplo un engrasador formado por una carcasa 27 en cuyo interior se aloja una bola de cierre 29 y un muelle 31. La forma de realización presentada en la Fig. 4 mejora aun más las prestaciones del rodillo de la invención, ya que a las propiedades lubricantes del lubricante sólido incluido en el cojinete 3 se le añaden las prestaciones de un lubricante líquido que es inyectado en el conducto de lubricación 23 a través del engrasador 25. A variant of the roller of Fig. 3 is shown in Fig. 4. In this case, the pivot shaft 5 has a lubrication duct 23 extending from the outer end 7 of the pivot shaft 5 to an intermediate point of the contact surface between the axis of rotation 5 and the bearing 3 of thermoplastic material. A greaser 25 closes the open end of the lubrication duct 23. The greaser 25 can be any conventional greaser, for example a greaser formed by a housing 27 inside which a closing ball 29 and a spring 31 are housed. of embodiment presented in Fig. 4 further improves the performance of the roller of the invention, since the performance of a liquid lubricant that is injected into the lubrication line is added to the lubricant properties of the solid lubricant included in the bearing 3 23 through the oiler 25.

Claims

REIVINDICACIONES
1.- Rodillo de soporte para cinta transportadora a cielo abierto, que comprende una carcasa cilindrica (1 ), por lo menos un cojinete (3) y por lo menos un eje de giro (5), caracterizado porque dicha- carcasa cilindrica (1) es de material plástico reforzado, y dicho por lo menos un cojinete (3) es de material termoplástico con una adición de un lubricante sólido.1.- Support roller for opencast conveyor belt, comprising a cylindrical housing (1), at least one bearing (3) and at least one axis of rotation (5), characterized in that said cylindrical casing (1 ) is made of reinforced plastic material, and said at least one bearing (3) is made of thermoplastic material with an addition of a solid lubricant.
2.- Rodillo de soporte según la reivindicación 1 , caracterizado porque dicho material plástico reforzado es un material antielectrostático.2. Support roller according to claim 1, characterized in that said reinforced plastic material is an electrostatic material.
3.- Rodillo de soporte según una de las reivindicaciones 1 ó 2, caracterizado porque dicho material plástico reforzado es una poliolefina, preferentemente polipropileno, reforzada con fibra de vidrio.3. Support roller according to one of claims 1 or 2, characterized in that said reinforced plastic material is a polyolefin, preferably polypropylene, reinforced with fiberglass.
4.- Rodillo de soporte según por lo menos una de las reivindicaciones 1 a 3, caracterizado porque dispone de dos ejes de giro (5) coaxiales.4. Support roller according to at least one of claims 1 to 3, characterized in that it has two coaxial axes of rotation (5).
5.- Rodillo de soporte según por lo menos una de las reivindicaciones 1 a 4, caracterizado porque dicha adición de lubricante sólido es de bisulfuro de molibdeno y está comprendida entre el 30% y el 70% en peso.5. Support roller according to at least one of claims 1 to 4, characterized in that said solid lubricant addition is molybdenum bisulfide and is between 30% and 70% by weight.
6.- Rodillo de soporte según por lo menos una de las reivindicaciones 1 a 5, caracterizado porque dicha carcasa cilindrica (1 ) presenta una superficie externa de bajo coeficiente de fricción.6. Support roller according to at least one of claims 1 to 5, characterized in that said cylindrical housing (1) has an external surface of low coefficient of friction.
7.- Rodillo de soporte según la reivindicación 6, caracterizado porque dicha carcasa cilindrica (1 ) tiene un recubrimiento de vaselina dura o de PTFE. 7. Support roller according to claim 6, characterized in that said cylindrical housing (1) has a hard petroleum jelly or PTFE coating.
8.- Rodillo de soporte según por lo menos una de las reivindicaciones 1 a 7, caracterizado porque dicha carcasa cilindrica (1 ) tiene una superficie externa de elevada resistencia al desgaste.8. Support roller according to at least one of claims 1 to 7, characterized in that said cylindrical housing (1) has an external surface of high wear resistance.
9.- Rodillo de soporte según por lo menos una de las reivindicaciones 1 a 8, caracterizado porque dicha carcasa cilindrica (1) tiene un recubrimiento de elastómero sintético, goma o caucho.9. Support roller according to at least one of claims 1 to 8, characterized in that said cylindrical housing (1) has a synthetic elastomer, rubber or rubber coating.
10.- Rodillo de soporte según por lo menos una de las reivindicaciones 1 a 9, caracterizado porque dicho eje de giro (5) tiene un recubrimiento de nitruro de boro o de cromo duro.10. Support roller according to at least one of claims 1 to 9, characterized in that said axis of rotation (5) has a boron nitride or hard chrome coating.
11.- Rodillo de soporte según por lo menos una de las reivindicaciones 1 a11. Support roller according to at least one of claims 1 to
10, caracterizado porque dicha carcasa cilindrica (1) está rellena de un material de relleno.10, characterized in that said cylindrical housing (1) is filled with a filling material.
12.- Rodillo de soporte según por lo menos una de las reivindicaciones 1 a12. Support roller according to at least one of claims 1 to
11 , caracterizado porque tiene por lo menos un cojinete axial (17) que se apoya sobre la superficie interna de dicho cojinete (3).11, characterized in that it has at least one axial bearing (17) that rests on the inner surface of said bearing (3).
13.- Rodillo de soporte según por lo menos una de las reivindicaciones 1 a13. Support roller according to at least one of claims 1 to
12, caracterizado porque dispone de un conducto de lubricación (23) en dicho eje de giro (5), dicho conducto de lubricación estando cerrado por un engrasador (25).12, characterized in that it has a lubrication line (23) on said axis of rotation (5), said lubrication line being closed by an oiler (25).
14.- Utilización de un rodillo de soporte según por lo menos una de las reivindicaciones 1 a 13 en una instalación del grupo formado por instalaciones portuarias, canteras y minas.14. Use of a support roller according to at least one of claims 1 to 13 in an installation of the group consisting of port facilities, quarries and mines.
15.- Utilización de un rodillo de soporte según por lo menos una de las rei- vindicaciones 1 a 14, en el sector de la alimentación. 15.- Use of a support roller according to at least one of claims 1 to 14, in the food sector.
PCT/ES2002/000414 2001-09-06 2002-08-29 Supporting roller for an open conveyor belt and the use thereof WO2003020620A1 (en)

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ESP0102017 2001-09-06

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WO2012126737A1 (en) * 2011-03-23 2012-09-27 Abb Schweiz Ag Drive unit for a belt conveyor system
CN103129940A (en) * 2013-03-19 2013-06-05 汤阴县华北工业塑料装备有限公司 Bearing seat of carrier roller
CN104670835A (en) * 2015-02-11 2015-06-03 无锡惠发特精密机械有限公司 Supporting roller for belt type conveyer
US9573765B2 (en) 2011-08-23 2017-02-21 Siemens Aktiengesellschaft Belt-conveying installation, method for operating the same, and use thereof

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