CA1171257A - Apparatus for the repair and manufacture of endless rubber or plastic conveyor belts - Google Patents

Apparatus for the repair and manufacture of endless rubber or plastic conveyor belts

Info

Publication number
CA1171257A
CA1171257A CA000382468A CA382468A CA1171257A CA 1171257 A CA1171257 A CA 1171257A CA 000382468 A CA000382468 A CA 000382468A CA 382468 A CA382468 A CA 382468A CA 1171257 A CA1171257 A CA 1171257A
Authority
CA
Canada
Prior art keywords
pressure
girders
hydraulic
hydraulic tubes
tubes
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
CA000382468A
Other languages
French (fr)
Inventor
Peter Thies
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wagener Schwelm GmbH and Co
Original Assignee
Wagener Schwelm GmbH and Co
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
Priority claimed from DE3028401A external-priority patent/DE3028401C2/en
Priority claimed from DE3028400A external-priority patent/DE3028400C2/en
Priority claimed from DE19808032251U external-priority patent/DE8032251U1/en
Application filed by Wagener Schwelm GmbH and Co filed Critical Wagener Schwelm GmbH and Co
Application granted granted Critical
Publication of CA1171257A publication Critical patent/CA1171257A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G3/00—Belt fastenings, e.g. for conveyor belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
    • B29C66/4324—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms for making closed loops, e.g. belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B29C66/7214—Fibre-reinforced materials characterised by the length of the fibres
    • B29C66/72141—Fibres of continuous length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81422—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being convex
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81421—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave
    • B29C66/81423—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being convex or concave being concave
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81463—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8161—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material
    • B29C66/81611—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps said pressing elements being supported or backed-up by springs or by resilient material by resilient material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8182—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects
    • B29C66/81821—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects of the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8185—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • B29C66/82421—Pneumatic or hydraulic drives using an inflatable element positioned between the joining tool and a backing-up part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/855—Belt splicing machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/92—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/922—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools
    • B29C66/9221—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force or the mechanical power
    • B29C66/92211—Measuring or controlling the joining process by measuring or controlling the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force, the mechanical power or the displacement of the joining tools by measuring the pressure, the force or the mechanical power with special measurement means or methods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B1/00—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen
    • B30B1/003—Presses, using a press ram, characterised by the features of the drive therefor, pressure being transmitted directly, or through simple thrust or tension members only, to the press ram or platen by an elastic bag or diaphragm expanded by fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
    • B29L2031/7092—Conveyor belts

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Supports For Pipes And Cables (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Belt Conveyors (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Press Drives And Press Lines (AREA)
  • Processing Of Meat And Fish (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)

Abstract

ABSTRACT:
An apparatus for the repair of rubber or plastics conveyor belts, usually having reinforcement inserts, and for making them endless. The basic components of the apparatus are press plates which can be heated, upper girders, lower gliders and hydraulic pressure-producing equipment.
The girders are connected together in pairs by tensioning bolts with mechanical tightening facilities. The girders undergo bending deformation under a specified pressure, with a defined deflection curve or bending line. The pressure-producing equipment acts between one of the press plates and the associated girders, and consists of hydraulic tubes which are of constant perimeter but the cross-section of which can be deformed. The tubes are supported one one side by the associated girder, and on the other side on a pressure plate constructed with a U-profile. The distance of the pressure plate from the associated girder is adjustable and is so adjusted that in the operating condition the hydrau-lic tubes posses an oval cross-section. Conse-quently they can act as pressure-producing equipment, although constructed as hydraulic tubes of constant perimeter. The deflection of the girders can be compensated by a deflection curve compensator.

Description

~7~2~7 This invention relates to an apparatus for the repair of rubber or plastics conveyor belts (which usually have reinorcement inserts) and for making them endless, of the type having press plates that can be heated, upper and lower sets of girders, and hydraulic pressure-producing equipment, the upper and lower girders being connected together in pairs by tension rods with mechanical tightening facilities so as to undergo bending deformation under a specified pressure with a defined deflection cur~e or bending line, and the pressure-producing equipment acting between e one of the press plates and the adjacent girders.
The tension rods are normally threaded bolts that can be tightened by means of associated nuts. In addition in such presses the girders are as a rule flexibly constructed for reasons of weight, so that the whole system is of a flexible nature. Although the pressure-producing equipment acts between one of the press plates and the adjacent girders, b:oth the - upper and lower girders deform, this being according to a specified, essentially arch~
shaped deflection curve or bending line.

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~l~7~ ~57 In known appliances of this t~pe the pLessure-producing equipment comprises a multi-plicity of piston-and-cylinder units spaced along the length of the adjacent girders and inserted into these girders. Appropriate recesses or holes in the girders are necessary for this, whereby the girders are weakened, and con-sequently they must be correspondingly heavily and rigidly constructed, although on the other hand as already mentioned for reasons of ease in transport a particularly light and flexible construction is desired. Also the pressure is not developed uniformly and in a homogeneous manner, but rather at singular points corresponding to the individual positions of piston-and-cylinder units, even-though efforts are made to reduce the surface pressures by means of pressure shoes.
The piston-and-cylinder units themselves must be acted upon by pressures of several hundred bars.
Although all of this has proved satisfactory it is expensive.
In other flelds of engineeringt namely for transporting and conducting ùydraulic and pneumatic media under pressure, so-caIled hydraulic tubes are known which although they - ;: :
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are compressible do not however alter their perimeters under such deformation. Hydraulic tubes of this kind are described as stable-perimeter hydraulic tubes. They have hitherto not been applied in presses as active pressure producers with pressure-cushion functions or even as active pressure-transmitting units, because they cannot be inflated. Although it has already been proposed with basically similar appliances that a row of multiple piston-and-cylinder units should not be used, but instead inflatable pressure cushions should be used, this form of construction has not been successful ~ in practice. Also, although pressure cushions can remain adequately pressure-tight when they are subjected to the necessary pressure and are sturdy and trouble-free they are not easy to manufacture.
It is the object of the invention to create an appliance of the type initially described, with hydraulic pressure-producing equipment in which a row of multiple piston-cylinder devices is no longer necessary and in which moreo~er the pressure lS rendered uniform, yet being light and portable.

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,, ~ , , ;2S7 According to the present invention therefore, in an apparatus of the type initially described, the pressure-producing equipment com~
prises hydraulic tubes which are of constant perimeter but the cross-section of which can be deformed and.which are supported on one sidè by.
the adjacent girder while being accommodated on the other side in a pressure plate constructed with a U-profile and ad~ustable for spacing relative to the girder, and the spacing of the pressure plate from its girder being such that - the hudraulic tubes possess an oval cross-section in the operating condition.
~ The invention originates from the recognition that the hydraulic tu~es mentioned can replace the normal piston-cylinder devices in an applicance of thls generic type,even though the hydraulic tubes are of stable perimeter and . can only be deformed in a cross-sectlonal respect.
_~his replacement is possible if it is ensured that in operating conditions under pressure the hydraulic tubes, hàving a deflned:, essentially oval, cross-section, are supported with broad surfaces directly or indirectly against the : pressure plate and against the girder:. ~"Inùirectly"
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, `' ' means that supporting intermediate members can be provided, whether it be for heat insulation purposes or for other purposes. Also by the broad-surface support very uniform and homogeneous pressure distribution is obtained.
There are several possibilities for further development and design within the scope of the invention. One form of construction that has proved successful is characterized in that the oval operating condition possesses a cross-sectional area that amounts to between 25%
and 75% of the undistorted circular cross-sectional area of the hydraulic tubes. Care should be taken that .~

all the hydraulic tubes contribute similarly to pressure production. For this purpose it is desirable that the design should be so arranged that under operating conditions all the hydraulic `
tubes are deformed to the same degree and in the same manner. If under operating conditions all ; the hydraulic tubes under the girders experience the same compression along the whole length of the girders, then uniform surface pressures are also obtained.

-~71;2S~

In orderto ensure pressure dis-tribution that is as even as possible a preferred embodimen-t of the invention to which particular importance is attached is characterized in that the hydraulic tubes are attached to the adjacent girder and/or to the associated pressure plate with interposition of a deflection curve compensator. Herein :~ "deflection curve com-pensator" refers to an intermediate member the thickness of which is so arranged that it com-pensates for the deflection that the girder undergoes under operating conditions. For - this pùrpose a deflection curve compensator is in general flat on the one face and is bent on the other face in accordance with the sum of the deflection curves or bending lines of the girder under operating conditions. It can be produced as a continuous strip or plate or can be compounded from individual portions. A
deflection curve compensator is always desirable when the hydraulic tubes are located parallel to the girders and below them, e.g., with two hydraulic tubes lying adjacent to one another per girder. However, a deflection curve ' -`~:
1;257 compensator may be omitted. This applies particularly if the hydraulic tubes are located transversely to the girders. In addition the hydraulic tubes are preferably hydraulically connected to one another.
There are several possible ways of producing the pressure in the pressure medium. The tightening facility may be additionally employed as pressure-producing equipment. Then no separate pressurising means for the pressure medium is required.
Alternatively, a separate pump may be used for : supplying the pressure medium. In a form of construction without a separate source of pressure medium the hydraulic tubes are tightly sealed and containing an incompressible liqùid merely occupying part of their undeformed cir-cular cross-section, and the tightening facility of the tension rods is adapted to be additional~ly . the activation ~lns of the press~re-produclng .

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~7~57 equipment. In another form of construction the hydraulic tubes are hydraulically connected together a~d connected to a common source of pressure medium.
The pressure plate already mentioned can additionally be constructed as a thermal insulation device or be provided with such in-sulation if the temperature conditions determined by the heated press plates demand it. The pressure can be checked and measured without di~ficulty if at least one of the hydraulic tubes is equipped with a suitable indicating device, for example in the form of a pressure gauge. The pressure gauge may be attached by plug-in couplings and thereby is removable for transport purposes.
In order to obtain a very uniform initiation and distribution of pressure the individual hydraulic tubes should lie tightly against one another in their deformed oval condition.
Émbodlments of the inventlon will now be described,~with reference to the accompanying drawings, in which:-Figure 1 is a plan view o~ an appliance embodying to the invention;
Figure 2 is an enlarged section taken :: :
' `; , ~ ' : ' ` ' '. ', ' .

~ ~12t~7 from the line A-A of Figure 1;
Figure 3 is an elevation of the deflection curve compensator of Figure -2 as formed, Figure 4 is a section from the Line B-B of Figure 2 on an even ]arger scale;
Figure 5 corresponds to Figure 2 but shows an embodiment of the invention without a separate source of pressure medium;
Figure 6 is a section on the line C-C
of Figure 5 on a considerably enlarged scale; and Figure 7 corresponds to Figure 6 but shows another operational condition.
The appliance shown in Figures 1 to 4 serves to repair rubber or plastics conveyor belts 1, with the usual reinforcement inserts 2, and to make them endless. In basic construction the components of the appliance are press plates 3,4 that can be heated, a set of upper girders 5, a set of lower girders 6, and hydraulic pressure-producing equipment 7, connected to a source of pressure medium (not shown). Upper and lower girders 5, 6 are connected together in pairs by tension rods 8 in tbe form of tbrea~ed bo}ts wit~

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~7~LZS7 ~ mechanical tightening facilities 9 in the form of superimposed nuts. The girders 5, 6 undergo bending deformation under a specified pressure, with a defined de~lection curve or bending line 10.
The girders are arranged to be relatively pliable for reàsons of weight. The pressure-producing equipment 7 acts between the upper press plate 3 and the upper girder 5, but with the interposition of a pressure plate 12. The deformation has been 1C represented on an exaggerated scale in Figure 2.
Similarly the deflection curve compensator 11 represented in Figure 3 has been drawn with exaggeration of its upper arch-shaped contact - surface.
The pressure-producing equipment possesses a number of hydraulic tubes 7~which are of constant perimeter but the cross-section of which can be deformed. These hydraulic tubes 7 are supported on one side by the adjacent girder 5 and on the other side by a pressure plate 12, the distance of which from the girder 5 is~ad]ustable, its maximum distance A from the girder 5 with which it is associated being so limited that in the operating condition the hyraulic tubes 7 possess an oval cross-section. The hydrauli~

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tubes 7 lie in the pressure plates which in profile are U-shaped on account of flanges 15.
For setting the maximum spacing A, suitable spacing bolts 13, which are inserted into the girders 5, are attached to the pressure plates 12, the bolts 13 also being provided with compression springs 14, which serve the purpose of pressing the side flanges 15 against the under surfaees of the girders 5 so that the whole, particularly during transport and installation, is a closed unit. The design is so arranged that the hydraulic tubes 7 in their undeformed~condition possess a circular cross-section indicated by broken lines ~ in Figure 4, the diameter D being greater than the above-mentioned maximum spacing A. Finally the design is so arranged that in the operating condition under pressure the hydraulic tubes 7 are supported~on wide surfaces against the pressure plates 12 and girders 5, with essentially oval cross-se`etion. This support itself can take place either directly or indirectly. The hydraulic tubes 7 in their oval operating condition possess .
a cross-seetlon that amounts to about 75% of the undistorted eircular eross-sec~ion. For reasons already explained above a defleetion curve ~ `
:

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1~71~57 compensator 11 is provided between the girders 5 and the hydraulic tubes 7. In Figures 2 and 4 hydraulic tubes 7~are shown running parallel to and below the girders 5, with two hydraulic tubes 7 provided for each girder. However, they could alternatively run transversely to the girders 5, as is indicated in Figure 1, and in doing so the hydraulic tubes 7 form bridges below adjacent girders 5. It is not necessary to provide special support for the hydraulic tubes 7 in the regions between the girders 5. Each pressure plate 12 is additionally constructed as a thermal insulation ~ device or is provided with such insulation.
A pressure gauge 16, which is connected to one of the hydraullc tubes 7 by a plug-in coupling or the like serves to monitor the pressure. Under working conditions the hydraulic tubes 7 moreover lie tightly along-side one another, as Figure 4 shows. The deflection curve compensator 11 compensates for the deflection, or more exactly the bending lines, of the upper girder 5 and the lower girder 6.
Nevertheless the deflection curve compensator 11 can for manufacturing reasons possess an under 1~'71~57 surface which is flat in the unloaded condition (Figure 3). It then deforms to more or less symmetrical cross-section under working conditions.
Figures 5 to 7 illustrate an embodiment of the invention which works without a separate source of pressure medium. The hydraulic tubes 7 are again supported by the girders 5, and by the associated pressure plate 12 with interposition of the deflection curve com-pensator 11 already mentioned. In the manner already explained this compensates for the deflection of girders 5, 6 in the operating r condition. Figure 6 shows that the hydraulic tubes 7, which in this form of construction are tightly sealed, contain an incompressible liquid 17 that merely occupies about 75% of their undeformed circular tube cross-section, lea~ing spaces 18.
The nuts 9 on the tension bolts 8 also serve to effect the pressurising of the pressure-producing equipment. The inter~ior spaces of the hydraulic tubes 7 may be in communicating connection with one another. As the hydraulic tubes 7 are tightly sealed they are provided with fittings 19 which effect this sealing. If the hydraulic .

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1~71257 tubes 7 are in communicating connection with one another, the conduits for the communicating connection are located in these fittings. The pressure that is applied can be checked by measurement in simple manner as the tightening facilities 8, 9 already described are operated.
For this purpose a pressure indicating equipment in the form of a pressure gauge 16 or the like is attached to at'least one of the hydraulic tubes 7.
This can advantageously take place by means of a plug-in coupling so that the pressure indicating equipment may be taken ofE during transport of the appliance as a whole from one place where it is used to another. The hydraulic tubes 7 are located parallel to and below girders 5, with two hydraulic tubes 7 per girder. ~However, in principle the hydraulic tubes 7 could alternatively be located transversely to the girders 5, 6.
Figure 7 shows that in the deformed condition the hydraulic tubes 7~lie tlghtly alongside one another, whereby a very uniform distribution of pressure is achieved. The result that is ensured is that all cross-sections of the hydraulic tubes 7 under the associated girders 5, and that all the hydraulic tubes 7 in the operating condition :. . `
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~7125~7 experience the same deformation and thereby the same compression, so that in consequence a pressure-cushion operates with a hydrostatic state of stress and equal pressure throughout, and ensures uniform and adequately homogeneous pressure distribution. Any air cushion present in the hydraulic tubes 7, which is at excess pressure or reduced pressure compared with the atmosp~ere, does not deleteriously affect the operation described.
The deflection curve compensatOr 11 can be omi~ted from the construction according to Figures 1 to 4 and also from that according ? to Figures 5 to 7.

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Claims (11)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE
DEFINED AS FOLLOWS:
1. An apparatus for the repair of rubber or plastics conveyor belts and for making them endless, having press plates that can be heated, upper and lower sets of girders, and hydraulic pressure-producing equipment, upper and lower girders being connected together in pairs by tension rods with mechanical tightening facilities so as to undergo bending deformation under a specified pressure with a defined deflection curve or bending line, the pressure-producing equipment acting between one of the press plates and the adjacent girders, the pressure-producing equipment comprising hydraulic tubes which are of constant perimeter but the cross-section of which can be deformed and which are supported on one side by the adjacent girder while being accommodated on the other side in a pressure plate constructed with a U-profile and adjustable for spacing relatively to the girder, and the spacing of the pressure plate from its girder being such that the hydraulic tubes possess an oval cross-section in the operating condition.
2. An apparatus according to Claim 1, wherein in the oval operating condition the hydraulic tubes possess a cross-sectional area that amounts to between 25% and 75% of the un-distorted circular cross-sectional area.
3. An apparatus according to Claim 1, wherein the hydraulic tubes are hydraulically connected to one another.
4. An apparatus according to Claim 1, wherein the hydraulic tubes are arranged transversely to the girders.
5. An apparatus according to Claim 1, wherein the hydraulic tubes are arranged parallel to the girders.
6. An apparatus according to Claim 1, wherein the pressure plate is additionally constructed as a thermal insulation device or is provided with such insulation.
7. An apparatus according to Claim 1, wherein at least one of the hydraulic tubes is provided with a pressure indicating device.
8. An apparatus according to Claim 1, wherein in their deformed oval condition the hydraulic tubes lie tightly against one another.
9. An apparatus according to Claim 1, wherein each hydraulic tube is supported by the adjacent girder and/or by the associated pressure plate through an interposed deflection curve compensator.
10. An apparatus according to Claim 1, wherein the hydraulic tubes are tightly sealed but contain an in-compressible liquid merely occupying part of their undeformed circular hydraulic tube cross-section, and that the tightening facility of tension rods is adapted to be additionally the activation means of the pressure-producing equipment.
11. An apparatus according to Claim 1, 6 or 9, wherein the hydraulic tubes are hydraulically connected together and are connected to a common source of pressure medium.
CA000382468A 1980-07-26 1981-07-24 Apparatus for the repair and manufacture of endless rubber or plastic conveyor belts Expired CA1171257A (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE3028401A DE3028401C2 (en) 1980-07-26 1980-07-26 Device for repairing and making conveyor belts made of rubber or plastic
DEP3028400.5-16 1980-07-26
DE3028400A DE3028400C2 (en) 1980-07-26 1980-07-26 Device for repairing and making conveyor belts made of rubber or plastic
DEP3028401.6-16 1980-07-26
DE19808032251U DE8032251U1 (en) 1980-12-04 1980-12-04 PRESS STRAVERSE FOR DEVICES FOR REPAIRING AND ENDLESSING CONVEYOR BELTS
DEG8032251.6 1980-12-04

Publications (1)

Publication Number Publication Date
CA1171257A true CA1171257A (en) 1984-07-24

Family

ID=27188803

Family Applications (1)

Application Number Title Priority Date Filing Date
CA000382468A Expired CA1171257A (en) 1980-07-26 1981-07-24 Apparatus for the repair and manufacture of endless rubber or plastic conveyor belts

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AT (1) AT370037B (en)
AU (1) AU543056B2 (en)
BR (1) BR8104789A (en)
CA (1) CA1171257A (en)
DD (1) DD202264A5 (en)
DK (1) DK154619C (en)
ES (1) ES504278A0 (en)
FI (1) FI74656C (en)
FR (1) FR2487251B1 (en)
GB (1) GB2082966B (en)
GR (1) GR74939B (en)
IL (1) IL63334A (en)
IT (1) IT1138854B (en)
MA (1) MA19225A1 (en)
MX (1) MX154889A (en)
NL (1) NL8103276A (en)
NO (2) NO152623C (en)
NZ (1) NZ197650A (en)
PL (1) PL129860B1 (en)
RO (1) RO84869B (en)
SE (1) SE451250B (en)
YU (1) YU42695B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023122835A1 (en) * 2021-12-28 2023-07-06 Rampart Detection Systems Ltd. Vulcanizing press and method of operating the same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3322562C1 (en) * 1983-06-23 1984-08-16 Wagener Schwelm GmbH & Co, 5830 Schwelm Clamping device for clamping a conveyor belt
JPS60151048A (en) * 1984-01-19 1985-08-08 日立化成工業株式会社 Manufacture of laminated board
WO2006072144A1 (en) * 2005-01-06 2006-07-13 Mato Australia Pty Limited Conveyor belt clamp assembly
DE202007010606U1 (en) * 2007-07-27 2007-11-29 Künneth & Knöchel KG pressing device

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2363779A (en) * 1942-06-25 1944-11-28 Beech Aircraft Corp Hose actuated press
FR1066382A (en) * 1952-11-08 1954-06-04 Vulcanizing press
FR1174451A (en) * 1957-04-30 1959-03-11 Kleber Colombes Removable press with deformable plates
FR2172606A5 (en) * 1972-02-17 1973-09-28 Minet Ets
GB1595173A (en) * 1976-11-05 1981-08-12 Modern Precision Engs & Associ Presses
DE2734025C3 (en) * 1977-07-28 1982-01-07 Wagener Schwelm GmbH & Co, 5830 Schwelm Device for repairing and making conveyor belts endless

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023122835A1 (en) * 2021-12-28 2023-07-06 Rampart Detection Systems Ltd. Vulcanizing press and method of operating the same

Also Published As

Publication number Publication date
AU543056B2 (en) 1985-03-28
ES8205157A1 (en) 1982-06-16
GB2082966A (en) 1982-03-17
MA19225A1 (en) 1982-04-01
IL63334A (en) 1985-02-28
NZ197650A (en) 1985-02-28
IL63334A0 (en) 1981-10-30
NO152623B (en) 1985-07-15
NL8103276A (en) 1982-02-16
NO812546L (en) 1982-01-27
PL232341A1 (en) 1982-02-01
NO153906C (en) 1986-06-11
DD202264A5 (en) 1983-09-07
RO84869A (en) 1984-08-17
BR8104789A (en) 1982-04-13
NO152623C (en) 1985-10-23
AU7244481A (en) 1982-02-04
ATA316081A (en) 1982-07-15
NO153906B (en) 1986-03-03
MX154889A (en) 1987-12-28
YU178881A (en) 1983-12-31
DK154619B (en) 1988-12-05
DK154619C (en) 1989-05-01
IT8123064A0 (en) 1981-07-22
FR2487251B1 (en) 1985-07-05
NO833336L (en) 1982-01-27
FR2487251A1 (en) 1982-01-29
YU42695B (en) 1988-10-31
GR74939B (en) 1984-07-12
SE8104489L (en) 1982-01-27
DK332381A (en) 1982-01-27
IT1138854B (en) 1986-09-17
SE451250B (en) 1987-09-21
GB2082966B (en) 1983-11-02
AT370037B (en) 1983-02-25
PL129860B1 (en) 1984-06-30
FI74656C (en) 1988-03-10
RO84869B (en) 1984-09-30
FI812244L (en) 1982-01-27
FI74656B (en) 1987-11-30
ES504278A0 (en) 1982-06-16

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