WO2008070444A2 - Convoyeur d'entraînement intermédiaire et procédé - Google Patents

Convoyeur d'entraînement intermédiaire et procédé Download PDF

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Publication number
WO2008070444A2
WO2008070444A2 PCT/US2007/085178 US2007085178W WO2008070444A2 WO 2008070444 A2 WO2008070444 A2 WO 2008070444A2 US 2007085178 W US2007085178 W US 2007085178W WO 2008070444 A2 WO2008070444 A2 WO 2008070444A2
Authority
WO
WIPO (PCT)
Prior art keywords
drive
belt
conveyor belt
conveyor
travel
Prior art date
Application number
PCT/US2007/085178
Other languages
English (en)
Other versions
WO2008070444A3 (fr
Inventor
Andrew A. Corley
Original Assignee
Laitram, L.L.C.
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 Laitram, L.L.C. filed Critical Laitram, L.L.C.
Publication of WO2008070444A2 publication Critical patent/WO2008070444A2/fr
Publication of WO2008070444A3 publication Critical patent/WO2008070444A3/fr

Links

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
    • B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
    • B65G23/02—Belt- or chain-engaging elements
    • B65G23/14—Endless driving elements extending parallel to belt or chain
    • B65G23/16—Endless driving elements extending parallel to belt or chain with dogs engaging abutments on belts or chains

Definitions

  • the invention relates generally to power-driven conveyors and, more particularly, to conveyor belts driven by one or more intermediate drive belts.
  • Intermediate drive belts are often used to drive conveyor belts on long or winding conveyor paths. These intermediate drive belts are short belts that drive the conveyor belt at strategic locations along the conveying path. In this way, the load is transferred to the intermediate drive belts and the main drive sprockets, which are typically located at the end of the conveyor carryway or in the return. Because the maximum tension in the conveyor belt is lower than in a conveyor belt without an intermediate drive, a less-expensive conveyor belt with a lower belt-pull rating can be used or the conveyor belt can be used for longer runs between the main drive sprockets.
  • the pressure angle at the contact of the intermediate drive belt's driving surfaces with the conveyor belt's drive -receiving surfaces affects the quality of the driving engagement. Small pressure angles direct more of the drive energy into driving the conveyor belt in its intended direction. But disengagement of a drive belt from a conveyor belt without scrubbing for small pressure angles is difficult. Greater pressure angles can reduce or eliminate scrubbing on disengagement, but result in driving the conveyor belt less efficiently and in pushing the conveyor belt upward, which may necessitate the use of conveyor belt hold downs.
  • An intermediate-drive conveyor embodying features of the invention may be used to overcome some of these shortcomings or to solve other problems.
  • One version of such a conveyor comprises a conveyor belt advancing along a conveying path in the direction of belt travel and a drive belt underlying the conveyor belt along a portion of the conveying path.
  • the conveyor belt has drive-receiving surfaces disposed on regular intervals in the direction of belt travel. The regular intervals define the conveyor belt's drive pitch.
  • the drive belt has driving surfaces disposed on other regular intervals, which define the drive belt's drive pitch.
  • the driving surfaces of the drive belt advancing in the direction of belt travel apply a driving force to the drive-receiving surfaces along a line of action generally in the direction of belt travel to drive the conveyor belt along the conveying path.
  • the drive belt's drive pitch is slightly less than the conveyor belt's drive pitch or an integral multiple of the conveyor belt's drive pitch.
  • a method of operating a conveyor comprises: a) arranging a conveyor belt having drive-receiving surfaces spaced apart along the length of the belt on regular intervals, which define the conveyor belt's drive pitch along the conveying path; and b) advancing a drive belt underlying the conveyor belt along a portion of the conveying path and having driving surfaces defining a pressure angle of less than about 5° engaging the drive-receiving surfaces of the conveyor belt to drive the conveyor belt along the conveying path.
  • the driving surfaces are spaced apart on regular intervals, which define the drive belt's drive pitch.
  • the drive belt's drive pitch is slightly less than the conveyor belt's drive pitch or an integral multiple of the conveyor belt's drive pitch.
  • FIG.l is a side elevation cross-sectional view of a portion of a conveyor showing the engagement of a drive belt with a conveyor belt;
  • FIG. 2 is a side elevation cross section of a portion of another conveyor embodying features of the invention including an alternative drive-belt hooked tooth structure;
  • FIGS. 3A and 3B are enlarged views of portions of FIG. 2 showing in more detail the drive belt engaging and disengaging the conveyor belt.
  • the conveyor 10 comprises a conveyor belt 12 advancing in a direction of belt travel 14 along an upper run defining the article-carrying portion of the conveyor belt's conveying path.
  • the conveyor belt has a top article-conveying side 16 on the upper run and an opposite bottom side 17.
  • the upper run is typically long and generally planar and may include a number of turns, left or right or both.
  • One or more drive belts 18 underlie the conveyor belt along portions of the conveying path.
  • the drive belts serve as intermediate drives for the long conveyor belt, transferring the load from the conveyor belt to the intermediate drive belts, preferably located at strategic locations, such as just before or after a turn.
  • belts could be flat belts, they are preferably modular plastic conveyor belts made of a series of rows of belt modules 20, 21 joined by hinge pins 22 confined in lateral passageways formed through interleaved hinge eyes at the leading and trailing ends of consecutive rows.
  • the hinge joints allow the modular belt to articulate about drive and idle sprockets.
  • the drive belt is driven by one or more drive wheels 24 mounted on a motor-driven drive shaft 26.
  • the drive belt loops around the drive wheels at one end and idle wheels 25 and an idle shaft 27 at the opposite end.
  • the central portion of the drive belt rides on a support surface 28 positioned slightly above the level of the drive and idle wheels.
  • the drive belt has outwardly extending teeth 29 that are regularly spaced in the direction of belt travel.
  • the drive belt has other teeth across its lateral width inward of the teeth shown from the side in FIG. 1.
  • the spacing 30 between the driving surfaces of consecutive teeth defines the drive belt's drive pitch P d .
  • the drive teeth are formed with a generally vertical leading driving surface 32 forming a pressure angle of substantially 0°.
  • the drive belt's teeth are received in recesses 34 formed in the interior of the conveyor belt along the upper run.
  • the recesses 34 which open onto the bottom side of the conveyor belt, are bounded at their forward ends by generally vertical surfaces 36.
  • the drive belt's driving surfaces push against the vertical surfaces of the conveyor belt to advance the conveyor belt in the direction of belt travel. Because of the 0° pressure angle, the line of action 37 of the force applied by the drive belt to the conveyor belt is generally in the direction of belt travel. In this way, the generally vertical surfaces serve as drive-receiving surfaces against which the driving force applied by the drive belt's driving surfaces act.
  • the conveyor belt's drive-receiving surfaces are spaced apart on regular intervals 38 that define the conveyor belt's drive pitch P c .
  • the drive belt's drive pitch Pd is preferably slightly less than the conveyor belt's drive pitch P c . In this way, all the drive belt's driving surfaces forward of a rearmost driving surface 32' fully engaging the corresponding drive-receiving surface of the conveyor belt are spaced farther and farther back from their corresponding drive-receiving surfaces as the pitch difference accumulates in the direction of belt travel.
  • FIGS. 2 and 3 Another version of a conveyor with an intermediate drive belt is shown in FIGS. 2 and 3.
  • the conveyor belt 42 is similar to the conveyor belt of FIG. 1, except that the drive- receiving surfaces 44 have a lower face 46 extending generally vertically into the interior of the belt from its bottom side 48. The lower face transitions to a forwardly angled face 47 at the distal end of the drive -receiving surface.
  • the teeth 50 on the drive belt 52 are similar to those on the drive belt 18 in FIG. 1, except that they have a different profile, in which the leading driving faces 54 are hook-shaped with a small-pressure-angle root portion 56 extending outward of the drive belt to a negative pressure-angle portion 58 terminating at a land 60.
  • the composite pressure angle 62 of the teeth is close to 0°, preferably less than about 5°, or even slightly negative to prevent the conveyor belt from being pushed upward away from the drive belt during engagement.
  • the hook-shaped teeth effectively hold the conveyor belt down without the need for special hold down belt or conveyor components.
  • the drive pitch Pd of the drive belt is preferably less than the drive pitch P c of the conveyor belt. This means that, as shown in FIG. 3 A, when a rearmost tooth 50' of the drive belt fully engages a corresponding drive -receiving surface 44', all the teeth forward of that position are spaced farther and farther behind their corresponding drive- receiving surfaces.
  • the rearmost driving surface may provide more of the driving force than all of the forward driving surfaces together.
  • the load may be shared among a few consecutive teeth as the load transitions from the rearmost tooth to the following tooth moving into engagement or because of slop caused by belt tolerances or wear.
  • nP c Pd + n ⁇ Pd, where nG ⁇ 1, 2, 3, . . . ⁇ and 0 ⁇ ⁇ ⁇ 0.1.
  • n ⁇ Pd represents the pitch difference, where ⁇ is preferably no greater than about 0.1, or 10%.
  • the pitch difference causes the driving surfaces of the drive belt to separate gradually from the corresponding drive -receiving surfaces on the conveyor belt as it advances along the upper run.
  • the separation 64 is enough to allow the tooth to exit the conveyor belt recess 66 without contact between the forward end of the tooth's land 60 and the conveyor belt's drive-receiving surface 44.
  • the pitch difference enables teeth with small pressure angles to be used in an efficient intermediate belt drive arrangement.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Belt Conveyors (AREA)
  • Structure Of Belt Conveyors (AREA)

Abstract

L'invention concerne un convoyeur et un procédé pour mettre en oeuvre un convoyeur ayant une courroie de convoyeur entraînée par une ou plusieurs courroies d'entraînement intermédiaires positionnées le long d'un trajet de transport. Les courroies d'entraînement ont des surfaces d'entraînement formées sur des dents qui sont reçues dans des évidements dans l'intérieur de la courroie de convoyeur. Les évidements sont délimités à leurs extrémités avant par des surfaces réceptrices d'entraînement. Les dents et les surfaces réceptrices d'entraînement correspondantes ont des profils avec de faibles angles de pression. Pour faciliter un désenclenchement des dents de la courroie d'entraînement des évidements sans frottement sur la courroie de convoyeur, l'entraînement de la courroie d'entraînement est légèrement inférieur à un multiple entier du pas d'entraînement de la courroie du convoyeur.
PCT/US2007/085178 2006-12-06 2007-11-20 Convoyeur d'entraînement intermédiaire et procédé WO2008070444A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US86874006P 2006-12-06 2006-12-06
US60/868,740 2006-12-06

Publications (2)

Publication Number Publication Date
WO2008070444A2 true WO2008070444A2 (fr) 2008-06-12
WO2008070444A3 WO2008070444A3 (fr) 2008-07-31

Family

ID=39492965

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/085178 WO2008070444A2 (fr) 2006-12-06 2007-11-20 Convoyeur d'entraînement intermédiaire et procédé

Country Status (1)

Country Link
WO (1) WO2008070444A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2105392A1 (fr) 2008-03-28 2009-09-30 Ammeraal Beltech Modular A/S Unité d'entraînement multiple pour convoyeur et convoyeur long
US8453825B2 (en) 2009-09-30 2013-06-04 Laitrom, L.L.C. Belt conveyor with a modular intermediate drive belt
WO2016203393A3 (fr) * 2015-06-19 2017-03-16 Pulsar S.R.L. Transporteur destiné à transporter un produit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033353A (en) * 1961-01-23 1962-05-08 Ashworth Bros Inc Conveyor drive apparatus
US5394978A (en) * 1993-09-29 1995-03-07 G&T Conveyor Company, Inc. Plate-type conveyor utilizing improved power applying means
US20020198074A1 (en) * 2001-06-22 2002-12-26 Hubert Goser Linear drive

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3033353A (en) * 1961-01-23 1962-05-08 Ashworth Bros Inc Conveyor drive apparatus
US5394978A (en) * 1993-09-29 1995-03-07 G&T Conveyor Company, Inc. Plate-type conveyor utilizing improved power applying means
US20020198074A1 (en) * 2001-06-22 2002-12-26 Hubert Goser Linear drive

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2105392A1 (fr) 2008-03-28 2009-09-30 Ammeraal Beltech Modular A/S Unité d'entraînement multiple pour convoyeur et convoyeur long
US8453825B2 (en) 2009-09-30 2013-06-04 Laitrom, L.L.C. Belt conveyor with a modular intermediate drive belt
WO2016203393A3 (fr) * 2015-06-19 2017-03-16 Pulsar S.R.L. Transporteur destiné à transporter un produit
US10329097B2 (en) 2015-06-19 2019-06-25 Pulsar S.R.L. Conveyor for transporting a product

Also Published As

Publication number Publication date
WO2008070444A3 (fr) 2008-07-31

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