FR2779708A1 - Belt conveyor with multiple belts - Google Patents

Abstract

The conveyor has a belt system (3) that supports a belt through a ninety degree turn. The belt is mounted upon a pair of rollers. To change direction of the band. The system incorporates a roller (7) that is situated at forty-five degrees to the direction of the belt. The belt passes around the roller and has its direction changed by ninety degrees.

Description

The invention relates to a belt conveyor.

  Generally, a belt conveyor comprises an endless belt circulating around two return members, such as parallel rollers and spaced from each other thus splitting, fictitiously, the belt into an upper strand and a lower strand. In sorting or grouping of objects installations, use is generally made of: - a main conveyor which moves in a so-called main direction and

  - secondary belt conveyors, arranged laterally-

  to feed the main conveyor.

  Quite often, the side conveyors are of the same type as the main conveyor and are mounted so that the axis of movement of the endless belt is perpendicular to the axis of movement of the main conveyor with the return member of the conveyor. secondary tangent to one of the edges

  side of the endless belt of the main conveyor.

  When the article from the side conveyor ends up on the main conveyor, the change of direction of movement of the article is abrupt and, to minimize this, the endless belts must then have speeds of

reduced displacement.

  To increase the performance of such a system, belt conveyors are known which allow objects to be introduced onto the main conveyor in an introduction direction forming with the direction of movement of the

  main conveyor at an acute angle, usually 45.

  These belt conveyors always include a single endless belt but which, this time, is deflected successively on at least four return members including two return members arranged at 450 relative to the direction of movement of the belt upstream of the reference body to 45 considered. Thus, the endless belt is deflected for the first time on a member inclined at 45 so that: - the section, called the second section of the endless strip downstream of the first deviation, moves perpendicular to the previous section, said first section, this second section is then deflected on a return member perpendicular to its axis of movement, this third section then moving in the opposite direction

of the second.

  The third section is then deflected on the second return member at 45 parallel to the first return member at 45 so that this fourth section moves in a

  direction perpendicular to the third section.

  The fourth section is then deflected on a return member perpendicular to its axis of movement to become

then the first section.

  Due to a change of direction to 90, various problems appear in particular for guiding the strip, the wear of the strip on the deflection members and the heating thereof which tends to increase its length and therefore

disrupt guidance.

  The invention proposes to remedy in particular the

aforementioned drawbacks.

  To this end, the invention relates to a conveyor belt comprising an endless belt deflected successively on at least four return members including: - a first return member perpendicular to the direction of movement of the belt, - a second member return positioned at 45 relative to the direction of movement of the strip upstream of the return member at 45 considered, - a third return member perpendicular to the direction of movement of the strip and - a fourth return member arranged at 45 and parallel to the aforementioned second return member, this device being characterized in that the surface on which the endless belt is supported so as to be deflected at the level of at least one of the return members at 45, is partly made up by the external surface of free rollers rotating around their axis, the rest of said surface being fixed.

  The invention will be better understood using the description

  below made by way of nonlimiting example, with reference to the attached drawing which schematically represents: - Figure 1: a top view of a conveyor, - Figure 2: a view along F of Figure 1, - FIG. 3: a view along V of FIG. 1,

  - Figure 4: a view of the supporting structure of the

voyeur,

  - Figure 5: a view of a detail of the conveyor.

  Referring to the drawing, it can be seen that, in order to feed articles to the main belt conveyor, lateral conveyors 2 are used which allow objects to be introduced onto the main conveyor in an introduction direction forming with the direction of movement of the main conveyor

  an acute angle, usually 45.

  Such a lateral belt conveyor 2 comprises an endless belt 3 deflected successively on at least four return members 4, 5, 6, 7 of which: - a first return member 4 perpendicular to the direction of movement of the strip, - a second return member 5 disposed at 45 relative to the direction of movement of the strip upstream of the return member at 45 considered, - a third return member 6 perpendicular to the direction of movement of the strip and - a fourth member 7 of reference disposed at 45 and

  parallel to the second aforementioned second reference member 5.

  This arrangement of the return members causes part of the endless belt to move in a first direction and the second part in a direction orthogonal to the first. The conveyor further comprises a device 9 for driving the belt and a roller 10 for tensioning the

endless band.

  These reference members 5 and 7 arranged at 45 are

generally called "sabers".

  According to the invention, the surface on which the endless belt rests to be deflected at the level of at least one of the members 5, 7 returning to 45, is partly constituted by the external surface of free rollers 11 in rotation about their axis, the rest of said surface being fixed. Preferably, the member 5, 7 for returning to 45 is made up alternately of rollers 11 free in rotation and of rollers 12 fixed so that: on the one hand, friction is reduced and the longevity of the strip is increased and - on the other hand, the lateral displacement of the strip is minimized. To compensate for the lateral displacement, a so-called correction roller 13 is used, extending transversely to the strip, which roller has one of its ends articulated on a fixed point while its other end is adjustable in a vertical plane so that it it is possible to warp the endless belt to make up for the lateral displacement effect of the

  strip on the return member at 45.

  To improve the guidance of the strip, one of the return members, other than those at 45, comprises two rollers 15, 16 arranged successively one behind the other with: - one 15 of the rollers having its concave generatrices and,

  - the other 16 its convex generatrices.

  Auxiliary rollers 20, 21 serve to ensure contact

with the actuator.

  One of the rollers 15, 16 can constitute the tension roller. To reduce the friction effect, the end of the endless band which has the function of supporting the load to be transported, is placed on a skeleton support structure 17

  formed of blades, in particular of stainless steel.

  These blades create an air cushion effect and promote

  the endless belt cooling.

  Advantageously, the drive device is a smooth cylinder provided with at least one brush for removing dust.

Claims (7)

  1. Belt conveyor comprising an endless belt (3) deflected successively on at least four return members (4, 5, 6, 7) including: a first return member (4) perpendicular to the direction of movement of the strip, - a second return member (5) disposed at 45 relative to the direction of movement of the strip upstream of the return member at 45 considered, - a third return member (6) perpendicular to the direction of movement of the strip and - a fourth return member (7) disposed at 45 and parallel to the aforementioned second return member (5), this arrangement of the return members causing part of the endless strip to move in a first direction and the second part in a direction orthogonal to the first, this conveyor being CHARACTERIZED in that the surface on which the endless belt is supported so as to be deflected at the level of at least one of the reference members at 45, is partly formed by the external surface of rollers (11) free to rotate about their axis, the rest of said surface being fixed. 2. Conveyor according to claim 1 characterized in that the member (5, 7) returning to 45 is alternately composed   rollers (11) free to rotate and fixed rollers (12).   3. Conveyor according to claim 1 or 2 characterized in that one uses a roller (13) said correction extending transversely to the band, which roller has one of its ends articulated on a fixed point while its other end is adjustable in a vertical plane so that it is possible to warp the endless belt to catch the effect of   lateral movement of the strip on the return member at 45.   4. Conveyor according to any one of claims 1 to   3 characterized in that one of the return members, other than those at 45, comprises two rollers (15, 16) arranged successively one behind the other with: 6 2779708   - one (15) of the rollers having its concave generatrices and,   - the other (16) its convex generatrices.   5. Conveyor according to claim 1 characterized in that the end of the endless belt which has the function of supporting the load to be transported, poses on a skeleton support structure (17) formed by blades, in particular stainless steel . 6. Conveyor according to claim 5 characterized in that an air cushion is formed between the blades and the endless belt, which air cushion promotes cooling of the endless band.   7. Conveyor according to claim 1 characterized in that the drive device is a smooth cylinder provided   at least one brush to remove dust.