NL2022740A

NL2022740A - Support structure with improved guides for an articulated-link conveyor

Info

Publication number: NL2022740A
Application number: NL2022740A
Authority: NL
Inventors: Marsetti Sergio; Marsetti Matteo
Original assignee: Movex S P A
Priority date: 2018-03-16
Filing date: 2019-03-14
Publication date: 2019-09-25
Also published as: NL2022740B1; ES1227334Y; IT201800003679A1; ES1227334U; DE202019101075U1

Abstract

A support and guide structure is described for a closed-loop articulated-link conveyor which comprises a support component and at least two guides which define respective sliding 5 surfaces for a forward path of the articulated-link conveyor. The support component comprises at least on first surface and at least one second surface opposed to each other. The guides are fastened on the first surface, whereas at least two walls extend from the second surface and comprise respective grooves which implement a sliding support for the articulated-link conveyor in its return path. The first surface, the second surface, and the walls 10 are integrally manufactured with a first material. The support component also comprises a plurality of cavities each designed to house one or more magnets. The cavities are obtained in the support component and are provided with respective closing plates. The guides are provided with fastening means which are reversible and removable with respect to the first surface and are manufactured with a second noble material different from the first material 15 with which the first surface, the second surface, and the walls are integrally manufactured.

Description

DESCRIPTION

The present invention generally relates to an articulated-link conveying device and, more specifically, to a support and magnetic guide structure for an articulated-link conveyor.

Even more specifically, the present invention relates to a curvilinear support structure for guiding an articulated-link conveyor at least partially made of a ferromagnetic material, wherein such support structure is provided with magnets configured for attracting the links of the conveyor towards their respective sliding surfaces. This support structure may constitute both the upper part, or forward path, and the lower part, or return path, of a closed-loop articulated-link conveyor.

As is known, an articulated-link conveyor comprises a sequence of generally plate-like links, which extend in a direction substantially transversal to the moving direction of the conveyor. In the forward path of the conveyor, in a typical closed-loop path, these links form a rest surface for the objects moved by the conveyor itself.

Considering the moving direction of the conveyor, every link is connected to the previous link and to a subsequent link by way of hinges usually located in the central part of every link. This way, the links form a continuous closed-loop conveyor, whose forward and return paths usually overlap.

The links are either made of steel, like those described in the ISO 4348 Standard, or of plastic. Should the links be made of plastic, they are conveniently provided with pivot hinges made of a ferromagnetic material in order to interact with the magnets of the support and guide structure.

As a matter of fact, the use of a support structure provided with a respective sliding rail is known to guide a closed-loop articulated-link conveyor. Each sliding rail is provided with a pair of sliding surfaces which guide the sliding movement of the opposed transversal ends of the links of the conveyor in the respective forward path. These sliding surfaces are placed either at a constant distance from each other or at different distances.

-2A hollow space, also referred to as channel, is present between the two sliding surfaces to allow to receive the articulation elements of the links of the conveyor. One or more guides are usually present on the surface opposed to that of the channel to route the links of the conveyor in their return path on their respective support structure.

Should it being necessary to guide a plurality of articulated-link conveyors, the support structure might be provided with a corresponding plurality of sliding rails, that is to say one sliding rail for each articulated-link conveyor. The support structure might also be provided with a plurality of return paths for the articulated-link conveyors. In this event the number of the return paths equals the number of the sliding rails of the forward paths and they are usually opposed, that is to say placed below, with respect to such sliding rails.

In the case of links at least partially made of a ferromagnetic material, the support structure is provided with a plurality of magnets. These magnets are usually positioned below the level of the sliding plane, at the center line axis of each channel. These magnets create a magnetic field which holds the links adherent to the sliding surfaces of the support structure. As a matter of fact, while the conveyor moves, the links would tend to raise from their respective sliding surface, thus jeopardizing the stability of the conveyed objects, if the attraction force exerted by the magnets were not there.

The sliding rails for articulated-link conveyors feature either a rectilinear axis or a curvilinear axis. Examples of curvilinear-axis sliding rails for ferromagnetic articulated-link conveyors are described, for example, in documents EP 0325333, EP 0790197, EP 0903307, EP 0916599, EP 1091894 and EP 2907774, the latter on behalf of the present patent applicant.

In many embodiments of articulated-link conveyors, their respective support structure consists of two separate components, joined to each other by way of fastening means usually consisting of screws or bolts. A first component comprises the sliding surfaces and the channel which hold and guide the links of the conveyor in the respective forward path. A second component, placed below the first component, comprises the support and guide elements for the links of the conveyor in the respective return path.

Since the forward path of the articulated-link conveyor is the most critical one in terms of wear and tear of the support structure, such conveyor being burdened by the weight of the objects to be conveyed in such forward path, the first component of the support structure is usually made of a better and/or more valuable, hence more expensive, material as compared to the material that the second component underneath is made of. In addition, just because of wear

-3and tear, but also because of maintenance requirements and in order to conform to the standards ruling food conveyance (a typical use of the articulated-link conveyors is just that aiming at moving food products), it is necessary to periodically replace the sliding surfaces of the forward path of the conveyor. However, not always the present fastening means used to connect the components of the support structure of the conveyor make these replacement operations quick and easy to make.

An object of the present invention is therefore to provide a support and magnetic guide structure for an articulated-link conveyor that is capable of solving the above-mentioned drawbacks of the prior art in an extremely simple, cost-effective, and particularly functional manner.

In details, an object of the present invention is to provide a support and magnetic guide structure for an articulated-link conveyor that allows to definitely minimize the quantity of more “valuable” material to be used to implement the sliding surfaces of the forward path of the conveyor, with consequent reduced costs and improved performances for the complete conveying equipment.

Another object of the present invention is to provide a support and magnetic guide structure for an articulated-link conveyor that allows to make the links of the conveyor slide in the respective forward path in an easier manner as compared to the embodiments of the prior art. A further object of the present invention is to provide a support and magnetic guide structure for an articulated-link conveyor that allows to easily and quickly remove the sliding surfaces of the forward path of the conveyor.

These objects according to the present invention are achieved by providing a support and magnetic guide structure for an articulated-link conveyor as set forth in claim 1.

Further characteristics of the invention are highlighted by the dependent claims, which are an integral part of the present disclosure.

The characteristics and the advantages of a support and magnetic guide structure for an articulated-link conveyor according to the present invention will be more apparent from the following, explanatory but not limitative, description, which makes reference to the attached schematic drawings, wherein:

-4figure 1 is an isometric perspective top view of a portion of a support and magnetic guide structure for an articulated-link conveyor according to the present invention, wherein three different curvilinear guides and two respective channels delimited by such guides are visible; figure 2 is an isometric perspective bottom view of the structure shown in figure 1;

figure 3 is an exploded view of the structure shown in figure 1;

figure 4 is an enlarged view of the detail identified by IV in figure 3;

figure 5 is a perspective view of a portion of a generic articulated-link conveyor that can be used in the structure shown in figure 1; and figures 6A and 6B show two possible embodiments of fastening means used to secure the guides to the structure shown in figure 1.

With reference to the figures, a preferred embodiment of the support and magnetic guide structure for an articulated-link conveyor according to the present invention is shown. The support and guide structure is indicated as a whole by the reference numeral 10, whereas the articulated-link conveyor is indicated by the reference numeral 12.

Even though one portion only of the conveyor 12 is shown in figure 5, this conveyor 12 is a closed-loop one, that is to say designed to cover a forward path and a return path, overlapped to each other, along the support and guide structure 10. Also, the support and guide structure 10 is a magnetic one, that is to say provided with a plurality of magnets (described more in details below) designed to interact with ferromagnetic portions of the links of the conveyor 12.

The support and guide structure 10 comprises at least two separate guides 14, 16, 18, arranged at a predefined distance from each other. These guides 14, 16, 18 are either equally spaced from each other or put at different distances. In the embodiment shown in the figures, three guides 14, 16, 18 are shown. However, the number of guides 14, 16, 18 might be increased at will according to the actual requirements, the minimum number being two.

The guides 14, 16, 18 are oriented along respective development axes X, Y, Z and define respective sliding surfaces for a forward path of the articulated-link conveyor 12. In the embodiment shown in the figures, the axes of development X, Y, Z are curvilinear and, more specifically, they consist of concentric arcs of circumference.

The support and guide structure 10 also comprises a support component 20 which, in turn, comprises at least one first surface 22 and at least one second surface 24, 26 opposed to each other. The guides 14, 16, 18 are fastened on the first surface 22, which faces upwards.

Pairs of guides 14, 16, 18 contiguous to each other define their respective sliding channels

-528, 30 which are delimited by such guides 14, 16, 18 and by at least one portion of the first surface 22. Each sliding channel 28, houses at least one portion of the articulated links of the conveyor 12 in the respective forward path.

In details, in the embodiment shown in the figures, the support and guide structure 10 comprises one single substantially flat first surface 22, designed for receiving three separate curvilinear guides 14, 16, 18. Thus, these three guides 14, 16, 18 enclose two sliding channels 28, 30 to guide two conveyors 12 in their forward path in the support and guide structure 10.

At least two walls 32, 34, 36 extend from the second surface 24, 26 and comprise respective grooves 38, 40 oriented along respective development axes X’, Y’, Z’ that are substantially parallel to the axes of development X, Y, Z of the guides 14, 16, 18. The second surface 24, 26, being opposed to the first surface, faces downwards and, consequently, its respective walls 32, 34, 36 extend substantially downwards, as shown in figure 1. Thus, the grooves 38, 40 provide a sliding support for the articulated-link conveyor 12 in its return path.

In the embodiment shown in the figures, which comprises three different curvilinear guides 14, 16, 18 and, consequently, two separate sliding channels 28, 30 also curvilinear, the support and guide structure 10 comprises three corresponding walls 32, 34, 36. These three walls 32, 34, 36 enclose, two by two, two lower channels provided with grooves 38, 40 to guide the two conveyors 12 in their return path in the support and guide structure 10.

A plurality of cavities 42 are obtained in the support component 20, each designed for housing one or more magnets 44. Therefore, in the assembled configuration of the support and guide structure 10, the cavities 42 are open at the second surface 24, 26 or, in other words, they face downwards and, more specifically, down to the return path of the conveyor 12. Each cavity 42 is provided with at least one closing plate 46, for instance equipped with screws, which encloses the cavity 42 itself and the magnet(s) 44 contained therein.

The bottom surface 56 of each cavity 42 is put at a minimum distance from the first surface 22 in order to increase the magnetic effect with respect to the links of the conveyor 12. Preferably, the bottom surface 56 of each cavity 42 is spaced by a distance ranging from 0 mm to 10 mm from the first surface 22. Even more preferably, the bottom surface 56 of each cavity 42 is spaced by a distance ranging from 0 mm to 5 mm from the first surface 22.

-6Conveniently, the first surface 22, the second surface 24, 26, and the walls 32, 34, 36 are integrally manufactured with a first material, typically a polymeric material. Preferably, the first material with which the first surface 22, the second surface 24, 26, and the walls 32, 34, 36 are integrally manufactured is polyethylene (PE).

Advantageously, the guides 14, 16, 18 are provided with fastening means 48, 50 which are reversible and removable with respect to the first surface 22 and are manufactured with a second noble material different from the first material with which the first surface 22, the second surface 24, 26, and the walls 32, 34, 36 are integrally manufactured. In particular, the second material forming the guides 14, 16, 18 has a lower coefficient of friction than the coefficient of friction of the first material with which the first surface 22, the second surface 24, 26, and the walls 32, 34, 36 are integrally manufactured. Preferably, the coefficient of friction of the second material with which the guides 14, 16, 18 are made of is lower by at least 10% than the coefficient of friction of the first material with which the first surface 22, the second surface 24, 25, and the walls 32, 34, 36 are integrally manufactured.

Preferably, the second material which the guides 14, 16 are made of is also a polymeric material. Even more preferably, the second material with which the guides 14, 16 are made of is a ultra-high molecular weight polyethylene (UHMW-PE) with the addition of solid lubricants. This second material, known under the tradename of BluLub®, is particularly suitable for limited lubrication or fully dry applications.

Therefore, guides 14, 16 made of the BluLub® material are more smooth-flowing than if using traditional materials. These guides 14, 16, as well as reducing the sliding friction of the links of the conveyor 12 in the respective support and guide structure 10, also reduce noise and wear of the guides 14, 16 themselves, besides requiring less energy for making the conveyor 12 move forward. In addition, the guides 14, 16 only being made of the BluLub® material, which is more expensive than other polymeric materials usually used for manufacturing such support and guide structure 10, whereas the first surface 22 or other parts of the support and guide structure 10 do not, result in an economical benefit, while providing increased performances for the complete conveying equipment.

According to a preferred aspect of the present invention, the fastening means used to secure the guides 14, 16, 18 to the first surface 22 are formed of a plurality of connection elements 48, 50 designed to be fitted by shape coupling, through friction and without screwing, on one side, in corresponding hollow seats 52 obtained on said first surface 22 and, on the opposite side, in corresponding hollow seats 54 obtained on each guide 14, 16, 18. These hollow seats

-752, 54, as well as their respective connection elements 48, 50 which insert thereinto, are oriented either along an axis A which is substantially perpendicular to a plane of development of the first surface 22 and of each guide 14, 16, 18, or according to an acute angle a with respect to such axis A.

Conveniently, should the axes of development X, Y, Z of the guides 14, 16, 18 and their corresponding development axes X’, Y’, Z’ of the grooves 38, 40 consist of concentric arcs of circumference or, in other words, should the support and guide structure 10 be curvilinear, at least one part of the connection elements 48, 50 oriented according to the angle a would be tilted toward the outer circumference of such support and guide structure 10, as shown in figure 3. This tilt counters the centripetal forces which generate while the conveyor 12 moves in the respective sliding channels 28, 30. The acute angle a is preferably an angle of about 10°.

In other words, the more the forces generated by the movement of the conveyor towards the inner circumference of the support and guide structure 10 increase, the more the respective inner guide (in this specific case consisting of the guide 14 in the attached figures) adheres to the first surface 22. Conversely, the outermost guide of the support and guide structure 10 (in this specific case consisting of the guide 18 in the attached figures) does not require connection elements 48, 50 being tilted, because such outermost guide is not stressed by the centripetal forces induced by the movement of the conveyor 12.

The connection elements 48, 50 might be any elements (a pivot, a tooth, a foil featuring a continuous or broken profile, etc.) that is designed to be fitted by shape coupling, through friction and without screwing, in the corresponding hollow seat 52, 54. Preferably the connection elements 48, 50 are cylindrical plugs. Consequently, the hollow seats 52, 54 are blind holes featuring a circular cross section.

Preferably, the connection elements 48, 50 are provided with a knurled lateral surface. This feature allows to get a greater friction force in securing its individual guide 14, 16, 18 onto its respective first rest surface 22, while retaining such fastening reversibility characteristics greater than those which would be obtained, for instance, by using fastening means consisting of screws or bolts. As shown in figures 6A and 6B, the cylindrical plugs 48 might even be provided with one or both heads 58 having an enlarged cylindrical shape, irrespective of whether the lateral surface is knurled (figure 6B) or not (figure 6A). By “enlarged cylindrical shape” we mean that each head 58 has an average thickness that is greater than the average thickness of the cross section of its respective cylindrical plug 48.

-8Additionally, having hollow seats that are obtained in the lower surface of each guide 14, 16, 18, which is the first contact surface with the first rest surface 22 of such guides 14, 16, 18, makes it possible to implement guides 14, 16, 18 that are smooth and do not have discontinuities above. In other words, the upper surface of the guides 14, 16, 18, which forms the sliding surface of the conveyor 12 in its respective forward path, is perfectly flat and uniform, i.e. without any holes which would conversely be necessary when using fastening means consisting of screws or bolts. This is particularly important when using a conveying equipment for moving food products. As a matter of fact, the presence of discontinuities on the sliding surfaces of the conveyor 12 would result in a residual dirt not conforming to the safety standards in force in the sector of food product conveyance.

It has been thus proved that the support and magnetic guide structure for an articulatedriink conveyor according to the present invention achieves the previously highlighted objects.

The support and magnetic guide structure for an articulatedflink conveyor according to the thus conceived present invention is however susceptible of numerous modifications and variants, all falling within the scope of one and the same inventive concept; also, all details can be replaced by technically equivalent elements. In practice, the materials used, as well as the shapes and dimensions, might be of any kinds depending on the actual technical requirements.

Therefore, the scope of protection of the invention is that set forth in the attached claims.

Claims

CONCLUSIONS

1] Support and guide structure (10) for an endless conveyor (12) with hinged links, the support and guide structure (10) comprising:

- at least two separate guides (14, 16, 18) arranged at a predetermined distance from each other, oriented along respective extension axes (X, Y, Z) and those respective sliding surfaces for a transport part of the hinged switching conveyor ( 12) define;

- a support element (20) comprising:

- at least a first surface (22) and at least a second surface (24, 26) that face in the opposite direction, said guides (14, 16, 18) being mounted on said first surface (22) about at least one sliding channel (28, 30) ) defined by said guides (14, 16, 18) and by at least a portion of said first face (22), said at least one sliding channel (28, 30) comprising at least a portion of the hinged links of the conveyor (12) ) in the respective transport part,

- at least two walls (32, 34, 36) protruding from said second face (24, 26) and comprising respective grooves (38, 40) oriented along respective center axes (X ', Y', Z ') that are substantially are parallel to the axes of extension of those guides (14, 16, 18), which grooves (38, 40) provide the sliding support of the hinged switch conveyor in the return part thereof, said first face (22), said second face (24) , 26), and said walls (32, 34, 36) are integrally made of a first material, and

- a plurality of cavities (42), each of which is designed to accommodate one or more magnets (44), the cavities (42) being arranged in that supporting element (20) being open at that second surface (24, 26) and are provided with respective closing plates, the supporting and guiding construction (10) being characterized in that said at least two guides (14, 16, 18) are provided with fastening means (48, 50) which are reversible and removable relative to that first face (22) and are made of a second material different from that first material from which said first face (22), said second face (24, 26) and said walls (32, 34, 36) as a whole are manufactured.

The support and guide structure (10) according to claim 1, characterized in that the second material forming said at least two guides (14, 16, 18) is a

- has a lower coefficient of friction than the coefficient of friction of the first material from which that first surface (22), that second surface (24, 26) and those walls (32, 34, 36) are made as a whole, the coefficient of friction of the second material is preferably at least 10% lower than the coefficient of friction of the first material.

The support and guide structure (10) according to claim 1 or 2, characterized in that said fastening means consist of a plurality of connecting elements (48, 50) designed to fit on the one hand form-fitting, by friction and without screws in, on the one hand, said first face (22), correspondingly hollow seats (52) and, on the other hand, correspondingly hollow seats (54) provided in each guide (14, 167, 18), said connecting elements (48, 50) ) are preferably provided with a ribbed side surface.

The support and guide structure (10) according to claim 3, characterized in that said hollow seats (42, 54) are oriented along a center line (A) that is substantially perpendicular to the plane in which said first plane ( 22) and each guide (14, 16, 18) extends.

The support and guide structure (10) according to claim 3 or 4, characterized in that at least a part of the hollow seats (52, 54) is tilted at an acute angle (a) with respect to a center line ( A) which is substantially perpendicular to the plane in which said first plane (22) and each guide (14, 16, 18) extends, which acute angle (a) is preferably an angle of approximately 10 °.

6] The support and guide structure (10) according to one of claims 3 -

5, characterized in that said connecting elements (48, 50) consist of cylindrical plugs and that said hollow seats (52, 54) consist of blind holes with a circular cross section.

The support and guide structure (10) according to one of the claims 1 -

6, characterized in that the bottom surface (56) of each cavity (42) is at a distance from said first surface (22), which distance has a value in the range of 0 mm to 10 mm, preferably in the range from 0 to 5 mm.

8] The support and guide structure (10) according to one of claims 1 -

7, characterized in that the extension axes (X, Y, Z) of said guides (14, 16, 18) and

- 11 the corresponding extension axes (X ", Y", Z ") of those grooves are curvilinear axes, preferably consisting of concentric circumferential arcs.

9] The support and guide structure (10) according to one of claims 1 -

8, characterized in that said first material from which said first face (22), said second face (24,

26) and those walls (32, 34, 36) manufactured as a whole is a polymeric material, preferably consisting of polyethylene (PE).

10] The support and guide structure (10) according to one of claims 1 -

9, characterized in that each second material forming guide (14, 16, 18) is a polymeric material, preferably ultra-high molecular weight polyethylene (abbreviated in English as UHMW-PE) with solid lubricant particles added thereto .

rig. I