Classifications

• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/006—Blow-moulding plants, e.g. using several blow-moulding apparatuses cooperating
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/28—Blow-moulding apparatus
  • B29C49/30—Blow-moulding apparatus having movable moulds or mould parts
  • B29C49/36—Blow-moulding apparatus having movable moulds or mould parts rotatable about 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/78—Measuring, controlling or regulating
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
  • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
  • G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes
• • 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
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/4205—Handling means, e.g. transfer, loading or discharging means
  • B29C49/42093—Transporting apparatus, e.g. slides, wheels or conveyors
  • B29C49/42095—Rotating wheels or stars

Definitions

• the invention relates to an arrangement for measuring the angular position of a rotary table for transporting a container, the arrangement comprising:
• An angular sensor which comprises a rotary measuring shaft and which is intended to measure an angle representative of the angular position of the plate.
• the in-line and mass-produced bottle manufacturing facilities include a plurality of processing machines that are installed in the chain. Each processing machine comprises means of automated transport of the containers.
• the containers circulate, preferably continuously, from an entrance of the installation to an output of the installation.
• the transport tray is integral in rotation with a central shaft which is rotated by a motor.
• processing machines are provided with moving parts which must be synchronized with the means transporting said installation.
• a blowing machine it is for example an elongation rod which is intended to stretch the container.
• a variable pitch transfer wheel it is for example gripping tongs of the containers.
• the angular sensor comprises a measuring shaft which is coupled to an upper end of the central shaft driving the plate.
• the tray has many massive elements which are mounted regularly around the axis of rotation of the plate, for example a blowing machine on board molds or a transfer wheel on the mobile gripping arms.
• these massive elements are mobile, in particular in rotation, the distribution of the masses is likely to vary during the operation of the machine, which alters the regularity of distribution of the masses around the axis of rotation of the central shaft . This causes an unbalance effect on the central shaft.
• the upper end of the central shaft is arranged at a relatively large distance, for example more than three meters, above the plateau. It follows that the shaft is likely to be slightly deformed in bending under the effect of unbalance. This causes radial vibrations of the axis of rotation of the upper end of the shaft at each turn of the plate.
• the angular sensor being carried by a fixed support, the axis of rotation of its measuring shaft remains radially fixed. This causes misalignments of the central shaft with respect to the measuring shaft during the rotation of the plate.
• the measuring shaft is then not perfectly coaxial with the central shaft over the duration of a plateau turn. In fact, the misalignment of the axis of rotation of the upper end of the central shaft with the axis of rotation of the measuring shaft is likely to vary dynamically depending on the rotation angle of the tray. The measurement error thus varies dynamically during the same lap.
• the upper end of the central shaft is subject to cyclical torsion which thus shifts physically the angular position of the upper end of the central shaft relative to the angular position of the plate.
• the moving masses are controlled in displacement relative to the plate at each turn, moving towards and away alternately from the axis of rotation of the central shaft. This is for example the case of the molds of a blowing machine which are open and then closed at each turn of the plate.
• the successive movements of each moving mass on board in one turn causes repeated variations in the moment of inertia of the plateau. This results in an oscillation of the speed of rotation of the central shaft at a determined frequency several times per revolution on either side of an average rotation speed.
• the invention proposes an arrangement of the type described above, characterized in that the rotary measuring shaft is connected in rotation with the central shaft in a transmission ratio determined by means of a kinematic motion transmission chain comprising at least a transmission wheel offset radially from the central shaft.
• the measuring shaft is connected in rotation directly with an intermediate rotating shaft which is arranged radially away from the central shaft and which is interposed in the kinematic chain between the measuring shaft and the central shaft;
• the intermediate shaft is intended to carry no container
• the intermediate shaft is arranged in a kinematic transmission chain between a motor and the central shaft;
• the intermediate shaft is formed by an output shaft of a geared motor driven by the motor;
• the measuring shaft is arranged substantially coaxially with the intermediate shaft and is rotatably connected with the intermediate shaft by coupling means;
• the measuring shaft is connected in rotation with the intermediate shaft by a mechanism for transmitting motion to at least two transmission wheels;
• the motion transmission kinematic chain between the measuring shaft and the central shaft comprises at least one flexible motion transmission belt
• the arrangement comprises means for tensioning the flexible transmission belt with a tension making it possible to filter cyclic variations of speeds of the central shaft;
• the measuring shaft is directly connected in rotation with the central shaft; -
• the measuring shaft is rotatably connected with an intermediate portion of the central shaft which is arranged closer to the plate than a free upper end of the central shaft;
• the plate is part of a rotary blowing machine which comprises a plurality of molding units which are evenly distributed on the periphery of the plate.
• FIG. 1 is a diagrammatic view from above showing a rotary blowing machine forming part of a container manufacturing installation, as well as a preform transport wheel up to the rotary blowing machine and a transport wheel. containers arranged at the outlet of the rotary blowing machine;
• FIG. 2 is a diagrammatic view from above which shows a motion transmission kinematic chain enabling the different rotary plates of FIG. 1 to be rotated synchronously;
• FIG. 3 is a view in axial section along the sectional plane 3-3 of FIG. 2, which shows an arrangement for measuring the angular position of the plate of the rotary blowing machine produced according to a first embodiment of FIG. invention
• FIG. 4 is a view in axial section along the sectional plane 4-4 of FIG. 2 which shows an arrangement for measuring the angular position of the plate of the rotary blowing machine produced according to a second embodiment of FIG. 'invention.
• FIG. 1 a rotary machine 10 for processing a container of thermoplastic material.
• the rotary processing machine is part of an apparatus for manufacturing containers made of thermoplastic material, such as bottles, flasks, etc.
• Such a rotary processing machine comprises individual means of transport of the containers, as well as processing means which are here embarked on the means of transport.
• the transport means comprise a plate 12 which extends in a radial plane.
• the plate 12 is secured in rotation about a central shaft 14 having an axially oriented axis "B" of rotation.
• such an installation comprises several processing machines which are arranged in the chain so as to continuously produce containers in large series.
• the installation comprises, by way of nonlimiting example, a rotary blowing machine for forming containers from hot preforms, for example by stretch-blow molding, a rotary filling machine and a rotary capping machine.
• the containers are conveyed continuously between these different processing machines by rotary transfer wheels.
• the rotary processing machine 10 is a rotary blowing machine.
• the on-board processing means on the rotary blowing machine comprise a plurality of molding units 16 which are regularly distributed over the periphery of the plate 12. Such an assembly formed by the plate 12 carrying the molding units 16 is generally called " carousel".
• Each molding unit 16 comprises two half-molds which are capable of occupying a closed position to allow the molding of the container from a preform and an open position in which the half-molds are spaced apart from each other. to allow extraction of molded containers.
• the half-molds are here articulated around a hinge axis axially oriented.
• the molding units 16 are controlled in the open position only in the vicinity of a fixed angular sector 18 of the trajectory of the molding units which successively allows the unloading of the molded containers and the loading of the hot preforms. They occupy their closed position on the rest of the circular trajectory around the axis "B" of rotation of the plate 12.
• FIG. 1 also shows a rotating preform transfer wheel which is intended to convey the preforms to the rotary machine for processing.
• the rotary transfer wheel comprises a plate 22 which extends in a radial plane.
• the plate 22 is integral in rotation with a central shaft 24 of axis "C" rotation axially oriented.
• the rotary transfer wheel 20 has arms 25 movably mounted on the plate 22. Each arm 25 is capable of individually gripping a preform.
• the plant also includes a rotatable molded container transfer wheel 26 for receiving the molded containers in the unloading and loading angular sector 18 of the rotary processing machine.
• Wheel 26 rotary transfer comprises a plate 28 which extends in a radial plane.
• the plate 28 is integral in rotation with a central shaft axially "D" axis of rotation.
• the rotary transfer wheel 26 comprises arms 31 movably mounted on the plate 28. Each arm 31 is able to individually grip a molded container.
• the rotary processing machine 10 is rotated by a motor 32 via a drive kinematic chain.
• the motor 32 is equipped with a geared motor 34.
• the geared motor 34 comprises an axially oriented axially oriented axis output shaft "E".
• the transmission kinematic chain is equipped with different transmission wheels such as pinions and / or pulleys.
• the output shaft 36 is guided in rotation by a guide bearing 39, here a ball bearing, which is mounted on a fixed support plate 43.
• the output shaft 36 is equipped with a first driving pulley 38.
• the first driving pulley 38 rotates a first driven pulley 40 which is mounted on a parallel shaft 42 by means of a first flexible transmission belt 41 such as a belt or a chain.
• the parallel shaft 42 also carries an input gear 44. It will be understood that the pinions are transmission wheels.
• the input gear 44 is meshing with an output gear 46 which is mounted on the central shaft 14 of the rotary processing machine.
• the rotary machine 10 is rotated by the motor 32 with a transmission ratio determined by the diameter of the different transmission wheels.
• the output gear 46 is here arranged axially under the plate 12.
• the latter is stretched by means 48 under tension such as a tensioner roller which exerts a transverse force "F" determined on one of the strands of the flexible belt 41 transmission.
• the output shaft 36 of the geared motor 34 is equipped with a second drive pulley 50.
• This second drive pulley 50 rotates, via a second flexible transmission belt 54, a second driven pulley 52 which is mounted on the central shaft 24 of the first wheel
• the second rotary transfer wheel 26 is rotated by a third flexible transmission belt 56 cooperating with a pulley 58 mounted on the central shaft 24 of the first transfer wheel 20 and with a second pulley 60 mounted on the shaft 30 of the second transfer wheel 26.
• Each belt 54, 56 is tensioned by tensioning means such as rollers 62, 64 associated tensioners.
• the manufacturing facility is equipped with movable members whose movements are controlled by electric motors. These electric control motors are synchronized according to the angular position of the plate 12 of the rotary processing machine. For this purpose, it is necessary to know the angular position of the rotary processing machine. To do this, the installation is equipped with an angle sensor 66, also known as an "encoder".
• such an angular sensor 66 comprises a rotary shaft 68 for measuring axis "G" of axial orientation.
• the rotary measuring shaft 68 drives a detection device (not shown) which is housed in a fixed casing 70.
• this is a optical sensor, a magnetic sensor or any other type of sensor capable of measuring an angle of rotation of the measuring shaft.
• the angle sensor 66 is arranged to measure an angle representative of the angular position of the tray 12 of the rotary machine 10.
• the half-molds in fact have very large masses, for example of the order of several tens of kilograms.
• the molding units 16 By opening only in the angular sector 18, the molding units 16 cause an imbalance in the distribution of the masses around the axis "B" of rotation because the half-molds in the open position are then slightly closer to the axis "B" rotation than the half-molds in the closed position.
• each molding unit 16 causes a variation in the moment of inertia of the rotary processing machine.
• the invention proposes to replace the direct coupling of the rotating rotary shaft 68 with the central shaft 14 by a transmission kinematic chain comprising at least one transmission wheel, such as a gearbox. pulley or gear, radially offset from the central shaft. This eliminates measurement errors caused by the dynamic misalignment of the rotary measuring shaft 68 with the central shaft 14.
• the transmission ratio between the central shaft 14 and the measuring shaft 68 is advantageously a power of two. For example, when the transmission ratio is 1: 4, it is known that the measurement shaft 68 will perform four turns for a central shaft revolution 14. The signal emitted by the angular sensor 66 is thus likely to be processed by an electronic control unit (not shown) which is able to deduce the angle of rotation of the central shaft 14.
• the measurement shaft 68 is directly linked in rotation with the central shaft 14.
• the casing 70 is fixed radially close to the central shaft 14, for example to a fixed support 72.
• the measuring shaft 68 extends here parallel to the central shaft 14.
• the central shaft 14 carries a first transmission wheel 74 which cooperates with a second transmission wheel 76 for driving the shaft 68 for measuring rotation.
• the second transmission wheel 76 is mounted directly on the rotary measuring shaft 68.
• the rotary measuring shaft 68 is thus led directly by the central shaft 14.
• the second transmission wheel 76 is axially offset relative to the central shaft 14.
• the two transmission wheels 74, 76 are here formed by gears which mesh directly.
• the transmission wheels are formed by pulleys which are connected by a flexible transmission belt.
• the measuring shaft is arranged so that its axis forms an angle with the axis of the central shaft.
• the transmission wheels are then formed by gears with concurrent axes.
• the first gear wheel 74 is advantageously arranged closer of the plate 12 than the free upper end of the central shaft 14 in the axial direction.
• the axial distance between the plate 12 and the first transmission wheel 74 is less than about one meter.
• the measuring shaft 68 is connected in rotation directly with an intermediate rotary shaft.
• This intermediate rotary shaft is arranged radially at a distance from the central shaft 14. Said rotary shaft intermediate is thus interposed in the kinematic chain between the measuring shaft 68 and the central shaft 14.
• said intermediate rotary shaft is intended to carry no container.
• it is not subject to variations of moment of inertia and, moreover, its moment of inertia is low compared to that of the assembly formed by the central shaft 14 and its plate 12 of the made of the absence of container transport tray.
• Said intermediate shaft is for example arranged in a kinematic transmission chain between the motor 32 and the central shaft 14.
• said intermediate shaft is here formed by the output shaft 36 of the gearmotor 34. It has indeed been found that this The arrangement made it possible to very satisfactorily reduce the measurement errors of the angular sensor 66.
• the measuring shaft 68 is here arranged parallel to the shaft
• the housing 70 of the angular sensor 66 is here fixed to the support plate 43 by means of a fixed flange 77.
• the rotary measuring shaft 68 is connected in rotation with the central shaft 14 by a transmission kinematic chain comprising a plurality of transmission wheels offset radially with respect to the central shaft 14, more particularly the input gear 44, the pinion 78 and the transmission wheel 76.
• the same advantage can be obtained by replacing the pinions by pulleys cooperating with a flexible transmission belt.
• the transmission ratio between the output shaft of the geared motor and the central shaft of the rotary processing machine is a power of two
• the measuring shaft is then connected in rotation with the intermediate shaft by coupling means.
• the speed of rotation of the plate 12 oscillates as a function of the openings and closures of the molding units 16. Such oscillations do not make it possible to carry out a fluid control of the movable members controlled by an electric motor. Indeed, these movable members are then themselves subjected to the same speed oscillations during their movements.
• the arrangement of a flexible transmission belt transmission in the motion transmission kinematic chain between the measuring shaft 68 and the central shaft 14 is capable of mechanically filtering these speed oscillations induced by the kinematics of the movements of the openings and the closures of the molding units.
• This filtering effect can be obtained in particular by adjusting the tensioning means of the flexible transmission belt to a voltage for filtering cyclic speed variations of the central shaft 14.
• the arrangement of the angular sensor 66 according to the second embodiment of the invention makes it possible to filter the oscillations of speed very effectively.
• the voltage usually applied to the first belt 41 of transmission is indeed already adapted to filter very effectively oscillations speeds. Such an arrangement thus does not require any particular adjustment.
• the arrangement made according to the teachings of the invention thus makes it possible to obtain an accurate measurement of the angular position of the plate 12 of the rotary processing machine in a simple manner and without having to resort to expensive coupling devices.
• the invention also proposes a solution for efficiently mechanically filtering the rotational speed oscillations of the plate 12 simply by adjusting the tension of a flexible transmission belt.
• the invention has been described with reference to a rotary blowing machine. It will be understood that other rotating machines of the manufacturing facility can benefit from the invention.
• the rotary processing machine can be formed by a filling machine.
• the invention can also be applied to a transfer wheel comprising pivoting arms. Indeed, such a wheel is also subject to variations of moment of inertia may cause measurement errors similar to those found on rotary blowing machines.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
• Specific Conveyance Elements (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=58739160

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Family Cites Families (5)

• 2017
  • 2017-03-07 FR FR1751821A patent/FR3054658B1/fr active Active
• 2018
  • 2018-03-06 EP EP18713314.5A patent/EP3592528A1/de not_active Withdrawn
  • 2018-03-06 CN CN201880016311.3A patent/CN110382202B/zh active Active
  • 2018-03-06 WO PCT/FR2018/050509 patent/WO2018162836A1/fr unknown

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