• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An extruder cleaning apparatus for operating with elastomer mixtures comprising a frame (11) supporting a screw (2) and a sleeve (1), the screw (2) being rotated about the longitudinal axis (X-X ') of the sleeve (2) when it is rotated by drive means, the sleeve having a feed inlet (3) of elastomer mixtures and an outlet (4) opening into a extrusion die (21) mounted on a support (20). According to the invention, the frame (11) is mounted in translation relative to the support (20) of the die (21) in a direction parallel to the longitudinal axis (X-X ') between a first position in which the sleeve (1) and the support (20) are in sealing contact to allow the mixture of elastomers to pass through the die (21) and a second position in which the sleeve (1) is spaced from the die (21) to performing the cleaning, and in that said device comprises an automatic coupling mechanism (40) for rapidly locking and unlocking the sheath (1) and the die (21) and allowing the frame (11) to move between the two positions.
    公开号:FR3038862A1
    申请号:FR1556801
    申请日:2015-07-17
    公开日:2017-01-20
    发明作者:Christophe Hombert
    申请人:Michelin Recherche et Technique SA Switzerland ；Compagnie Generale des Etablissements Michelin SCA；Michelin Recherche et Technique SA France；
    IPC主号:
    专利说明:

    DEVICE AND METHOD FOR CLEANING AN EXTRUDER FOR
    MIXTURES OF ELASTOMERS
    [001] The invention relates to the field of extrusion of elastomer mixtures more particularly intended for the manufacture of tires.
    In known manner, the manufacture of the rubber compound-based profiles that come into the composition of the tires uses extruders whose function is to produce rubber bands according to a specific profile. These extruders are formed mainly of a fixed sleeve and an extrusion screw movable in rotation inside the sheath.
    [003] The shape of the sleeve, that of the screw and their arrangement are such that the rotation of the screw has the effect of providing mechanical work to the mixture in order to increase the fluidity, on the one hand, and propelling said mixture to an extrusion die in order to impart a determined profile to the extruded product, on the other hand. The extrusion die is generally formed by the gap between a fixed profiled blade and a rotating roller or between two rotating rollers rotating in opposite directions. The continuous strip coming out of the extrusion apparatus may be wound on storage means for later use or may feed directly to a downstream assembly device.
    [004] At the end of the extrusion operation must be completely empty extruder including for its feeding with a different mixture. This operation is often performed manually by the operator who proceeds to the cleaning of the interior of the extruder after tilting back the vault thereof. A manual operation, tedious and time consuming.
    [005] EP 0 403 164 provides a solution to the problem of manual cleaning of an extruder and proposes an apparatus comprising gripping jaws for removing the residual solid material from the extrusion head, means for moving the jaws on a horizontal rail for evacuating the residual material extracted and means for disengaging it when the jaws arrive in the evacuation position. This solution allows, certainly, an automatic cleaning of the extrusion head, but at the cost of a rather complex ancillary installation.
    [006] JP 2005324395 discloses another cleaning installation of an extruder which is connected to a gear pump by an intermediate zone, the intermediate zone communicating with a jack whose thrust rod is perpendicular to the longitudinal axis of the extruder and is carried out so as to exert a force on the volume of rubber of the intermediate zone to evacuate via an adjacent discharge valve. The installation of this document also makes use of additional means of the wiper and discharge valve type which make the entire installation complex. This installation does not allow emptying the extrusion head which must then be disassembled and cleaned.
    [007] Furthermore, document FR 2889818 discloses an extruder in which the sheath and the die form an assembly which is mounted to move in translation relative to the extrusion screw for the purpose of adjusting the position of the screw. compared to the sector. Maintenance operations of the screw can be performed when the screw is completely disengaged from the sheath. However, the translational movement of the sheath and die assembly uses actuating means comprising two opposed cylinders and, in addition, control means for controlling and adjusting the position of the screw must also be provided. Such a solution makes expensive and complex construction of the extruder.
    [008] EP 1552914 proposes, similarly to the previous, to separate the screw and sheath of the extruder, but this time for the purpose of cleaning thereof. The extruder of this document is intended to supply two adjacent horizontal rollers of a rubber profile, supported by a common frame which at the same time supports the extruder sheath. More particularly according to this document, to access the interior of the extruder, the common frame is moved on a horizontal rail by controlling a hydraulic cylinder to move the sleeve away from the extrusion screw, and then the support frame is moved. of the two calendering rollers on a second horizontal rail parallel to the first to spread the sleeve relative to the calendering rollers. This already requires to provide the ends of the sleeve of two removable sealing devices and to provide a dual system of movement, one of the sleeve and the other of the common frame. Such a solution has weaknesses in terms of the sealing of the sheath and requires complicated displacement systems and which, moreover, make significant efforts to hydraulic actuating cylinder.
    The invention aims to overcome at least one of the disadvantages of the documents described herein and to provide a device and a cleaning method of an extruder intended to operate with different mixtures of elastomers to change quickly from mixing without making its structure more complex elsewhere.
    [010] This objective is achieved with a cleaning device of an extruder intended to operate with elastomer mixtures comprising a frame supporting a screw and a sleeve, the screw being caused to rotate about the longitudinal axis of the sleeve when it is rotated by drive means, the sheath having a feed inlet of elastomer mixtures and an outlet opening into an extrusion die mounted on a support, characterized in that the frame is mounted movably in translation relative to the support of the die in a direction parallel to the longitudinal axis between a first position in which the sleeve and the support are in sealing contact to allow the mixture of elastomers to pass through the die and a second position in which the sheath is spaced from the die to perform the cleaning, and in that said device comprises a automatic coupling mechanism for locking and quickly unlocking the barrel and the die and allow movement of the frame between two positions.
    [011] The cleaning device of an extruder according to the invention therefore comprises a frame which forms a support for the sleeve, the extrusion screw and the drive means in rotation thereof relative to the sheath. According to the invention, the frame is mounted to move in translation relative to an extrusion die located in the vicinity of the downstream end of the sleeve. The extrusion die is mounted on a fixed support of the device. The device also includes an automatic coupling mechanism that allows the sleeve to be quickly locked onto the die holder in the extruder's working position and unlocked rapidly to allow the sleeve to move away from the die and clean the die. extruder.
    [012] According to other advantageous features of the invention:
    The automatic coupling mechanism comprises a screw and nut type system and a rotation drive mechanism of the screw or nut; this allows the coupling system to ensure rapid axial attachment and, at the same time, to provide the locking force with resumption of axial clearances, for example those due to manufacturing tolerances or wear. This mechanism makes it possible to greatly reduce the force of the actuator so as to use electric actuator type actuators. In addition, a fine-pitch electric actuator type actuator is chosen to improve the reduction ratio and positioning accuracy;
    The support comprises a first ring, comprising inclined ramps, which is coaxial with a second ring integral with the outlet end of the sleeve and the second ring comprises inclined ramps which are made to cooperate with the inclined ramps of the first ring. Thus, the locking forces are uniformly distributed over the entire circumference of the sleeve, which makes it possible to have a very good seal between the sleeve and the die support, especially for high values of the working pressure inside the sleeve. extruder (about 200 bar);
    The inclined ramps of said first and second rings are made in the form of a plurality of tenons uniformly distributed over the circumference of each ring, the tenons of a ring being able to slide axially in the spaces existing between the tenons of the other ring. The tenons thus constitute a plurality of threads uniformly distributed over the circumference of each ring, their geometry allowing to engage and lock by rotation of one ring relative to the other, then disengage and slide axially;
    The rotational drive mechanism includes a toggle device hingeably connecting one of the rings to the shank of a translation actuator cylinder. This toggle mechanism allows to increase the clamping force applied to the ring during locking. Furthermore, at least one of the rods of the toggle is adjustable in length to optimize the closing angle to greatly increase the effort;
    The device comprises control means for opening and closing the automatic coupling mechanism. This ensures a fully automated operation of the device;
    In a variant of the invention, the extruder delivers in the gap formed between a first roller and a second roller which are rotatable and are rotated in opposite directions about axes parallel to each other and perpendicular to the axis. longitudinal of the sheath. These rollers are advantageously mounted on the die support which is fixed.
    [013] The object of the invention is also achieved with a cleaning method of an extruder intended to operate with elastomer mixtures comprising a frame supporting a screw and a sleeve, the screw being rotated in the sheath when it is rotated about the longitudinal axis of the sheath by drive means, the sheath having a feed inlet of elastomer mixtures and an outlet opening into a extrusion die mounted on a support, the method comprising the following steps: unlocking the sleeve of the die support using an automatic coupling mechanism for quickly locking and unlocking the sleeve and the support, translational movement of the frame relative to the support of the die in a direction parallel to the longitudinal axis between a first position in which the sheath and the support of the fili are in sealing contact to allow the mixture of elastomers to pass through the die and a second position in which the sleeve is removed from the die to allow cleaning, drive the rotating screw to perform the emptying of the extruder.
    [014] According to other advantageous features of the invention: - the rotation of the screw drive in the second position of the frame is in the same direction as that of rotation of the screw when the frame is in the first position which makes it possible to empty the residual mixture which is at the downstream end of the extruder; the displacement in translation of the frame is made at a distance at least equal to the distance between the downstream end of the screw and that of the die, which allows to completely clear the residual mixture of the die; the die has a convergent shape in order to prevent the blockage of the mixture by counter-stripping; the sheath comprises attachment means of the elastomer mixture which are active during the displacement of the frame between the two positions in order to take away the residual mixture during the displacement of the entire extruder; in an alternative embodiment of the invention, the extruder delivers in the gap formed between a first roll and a second roll which are rotatable and are rotated in opposite directions about axes parallel to each other and perpendicular to the longitudinal axis of the sheath; when the frame is in the second position, said first and second rollers are driven to evacuate the remaining mixture between the die and these rollers.
    [015] The invention will be better understood on reading the appended FIGS. 1 to 5, which are provided by way of example and are in no way limiting, in which: FIG. 1 represents a general schematic view in axial section of FIG. a cleaning device of an extruder according to the invention, Figures 2a to 2d show, in schematic sectional views, the various steps of the cleaning process of an extruder according to the invention, Figure 3 is a view of cut with the plane AA of Figure 2d of the device of the invention when the locking device is in the unlocked position, Figure 4 is a sectional view taken with the plane AA of Figure 2d of the device of the invention when the locking device is in the locked position; Figure 5 is a perspective view of a portion of the automatic coupling mechanism of the device of the invention, the extruder and the die holder being located at a distance from each other.
    [016] The cleaning device of an extruder intended to operate with mixtures of elastomers is shown in Figure 1 and comprises a frame 30 on which are mounted an assembly forming an extruder 10 and a support 20 of a die 21 The extruder assembly 10 comprises a cylindrical screw 2 which rotates inside a sleeve 1 and the drive means (not visible in the drawing) of the screw, such as an electric motor and a gearbox arranged at the the upstream end e thereof. The screw 2 rotates inside the sleeve 1, around the longitudinal axis X-X 'thereof. The sheath 1 has a generally cylindrical shape and comprises, upstream, a feed inlet 3 of elastomeric materials and, downstream, an outlet 4 towards a die through which passes the mixture of elastomers propelled by the screw 2. It will be recalled that, upstream and downstream, it is understood as seen in the direction of flow of the material between the feed inlet of the sheath and the outlet via the die 21.
    [017] The support 20 is integral with the frame 30 and has a through hole 24 of axis of symmetry aligned on the longitudinal axis X-X 'of the sleeve 1, in the extension of the latter. The die 21 is mounted with the fixing screws in the through hole 24 of the support 20 so as to be centered on the axis of the latter. The die 21 has a generally flattened shape (the transverse section being of generally elliptical shape) and it is convergent, as seen in axial section, between an upstream end 22 situated opposite the outlet 4 of the sleeve 1 and a downstream end 23 output of a profile. In operation, the mixture propelled by the screw 2 leaves in the form of a profile through the die 21 and is transferred via a conveyor towards a storage reel on which it is wound.
    [018] In an advantageous variant of the invention, the die 21 delivers in the air gap formed between a first roll and a second roll of axes parallel and perpendicular to the longitudinal axis X-X ', the two rollers (no shown in the drawings) being rotated in opposite directions. The rollers are mounted with their respective drive systems on the support 20. The two rollers form a roller die system having the role of profiling in strip form the mixture of elastomers which exits through the die 21. The profile thus obtained is then wound on a storage reel or it can be placed directly on an assembly drum adjacent to one of the rollers.
    [019] According to the invention, the extruder assembly 10 is mounted on a mobile frame 11, the frame being able to move in translation in a direction parallel to the longitudinal axis X-X 'of the sleeve 1. The frame 11 comprises for this purpose guide lugs 12 which are slidable along a fixed rail (not visible in the drawings) belonging to the frame 30. The frame 11 is movable under the action of the rod 13 of a electric jack 14 mounted on the frame 30.
    [020] The cleaning device of the extruder according to the invention also comprises an automatic coupling mechanism 40 for quickly locking and unlocking the sheath 1 relative to the support 20 of the die 21 in order to put them in sealed communication and then to separate them easily. The automatic coupling mechanism 40 comprises two rings 5, 25 each provided with fixing lugs 6, 26 and a mechanism 41 for rotating a ring relative to the other. More particularly, a first ring 5 is fixedly mounted on the sleeve 1, it is arranged to surround the outlet end 4 of the latter, and a second ring 25 is rotatably mounted on the side of the support 20 making facing the sheath 1, the two rings 5, 25 are coaxial, they being arranged along the axis X-X '. The ring 25 is held by an annular support 27 inside which it is rotated, the annular support 27 being integral with the support 20. The first ring 5 comprises tenons having at their upstream end inclined ramps 7 which are brought to cooperate with the inclined ramps 27 located at the downstream end of the tenons 26 of the second ring. The inclined ramps 7 and 27 follow a helical curve which, in a preferred embodiment of the invention has an inclination angle of about 10 ° to be reversible and out of the cone of friction between the two parts. The pins 5, 25 thus represent the threads of the automatic coupling mechanism 40 which is of the screw and nut type.
    [021] The number of tenons must be at least two to distribute the closing force on the circumference of the ring, the number of tenons increasing with the diameter of the ring and the axial force taken by the tenons. Furthermore, it is observed that the lower the number of tenons, the greater the angle of rotation of the ring 25 to unlock / lock, the longer the rods of the toggle must be long, and therefore the stroke of the cylinder must be more important too. The solution of the invention makes it possible to take into account all these constraints and to provide an automatic coupling mechanism of reduced bulk which at the same time ensures an effective closure without any risk of leakage of the mixture at the interface between the two parts. In the example shown, the ring 25 comprises eight pins, which corresponds to the number of threads of the automatic coupling mechanism 40, for a diameter of the ring of about 180 mm.
    [022] The pins 6 and 26 are uniformly distributed over the circumference of each ring 5 and 25 and are made so that the tenons 6 of a ring 5 can slide axially in the spaces between the pins 26 of the other ring 25 vis-à-vis when the sheath 1 and the die 21 are in the unlocked position.
    [023] The rotary drive mechanism 41 of the ring 25 comprises a toggle device 42 with push rod which is the rod 43 of an electric jack 44, as best seen in Figures 3 and 4. More particularly, the toggle device 42 comprises two rods 45 and 46 rotatably mounted at a common hinge 49 with an axis parallel to the axis X-X '. A first link 45 is mounted via a pivot 50 and a flange 47 on the front face of the ring 25, while the second link 46 is mounted via a pivot 51 and an upright 48 on the support 20, the axes of the pivots 50, 51 being also parallel to the axis X-X '. In operation, when the cylinder is controlled closing, its rod 43 extends and exerts pressure on the hinge 49 of the toggle device 42 which actuates in rotation the ring 26 relative to the ring 5 which is fixed and passes the locking mechanism 40 from the open position illustrated in FIG. 3 to the locking mechanism illustrated in FIG. 4. When actuating in the opposite direction of the jack 44, the rod 43 of the latter exerts a traction force on the hinge 49 which unlocks the two rings 5 and 25 together, the ramps of the tenons 26 of the ring 25 then being next to the ramps of the tenons 6 of the ring 5. The body of the jack 44 is pivotally mounted around a hinge 52 of an amount 53 fixed on the support 20. The use of a toggle device has the advantage that the force applied to the link 45 by the cylinder 44 is small compared to the clamping force which is finally t applied to the ring 25.
    [024] The following will be explained in the following the operation of the cleaning device according to the invention, with reference to Figures 2a to 2d and the process steps of the invention.
    [025] FIG. 2a illustrates the cleaning device of the extruder of the invention at the end of the extrusion operation, when the screw of the extruder is stopped to proceed with the emptying of the extruder. The jack 44 of the automatic coupling mechanism 40 receives a command (from a controller and control device) to proceed to unlock the rings 25 and 5, when the tenons 6 are brought in front of the spaces provided between the tenons 26, in order to be able to release the sheath 1. The control is then given to the jack 26 to move the movable frame 11 in the direction of the arrow illustrated in FIG. 2a.
    [026] FIG. 2b illustrates the extruder 10 in its position spaced from the support 20 and therefore the die 21. The residual mixture 60 which was initially between the downstream end of the screw 2 and the die 21 remains attached to the screw and is distance from the die. In a variant, there is provided gripping claws of the mixture to ensure that it remains fully secured to the screw. The claws 61 are placed on the ring 5 at the outlet of the sheath 1. One or more claws are provided that remain permanently attached to the sheath 1 and pass through its thickness to penetrate into the residual mixture 60. In a variant of the invention, the claws 61 serve as an insert for accommodating a pressure sensor or temperature of the mixture. The claws are dimensioned so as to be sufficiently long not to release the residual mixture 60 during the deformation thereof due to displacement of the extruder. In a variant, the shape of the outlet orifice of the sheath 1, or that of the ring 5, is not circular, it is made to act as a claw to retain the residual mixture when the shape of the die is undercut.
    [027] From the position illustrated in FIG. 2b, the screw is started to rotate in order to completely evacuate the mixture remaining inside the extruder, which mixture then falls by gravity (according to the arrow of FIG 2c) and is collected in a container. below (not shown). When rollers are provided at the downstream outlet of the die, they are also rotated in this step to evacuate the mixture remaining between the rollers and the die.
    [028] Figure 2d illustrates the step that terminates the cleaning operation, the extruder 10 being completely drained and the automatic coupling mechanism 40 is in the locking position. The extruder 10 is again operational, ready to receive a new mixture of elastomers, since the sheath 1 is in sealing contact with the support 20 and thus with the die 21.
    [029] Other variants and embodiments of the invention may be envisaged without departing from the scope of these claims. Thus, it is conceivable to replace the tenons by a continuous thread made in each of the rings.
    权利要求:
    Claims (14)
    [1" id="c-fr-0001]
    1) Device for cleaning an extruder intended to operate with elastomer mixtures comprising a frame (11) supporting a screw (2) and a sleeve (1), the screw (2) being caused to rotate around the longitudinal axis (X-X ') of the sleeve (2) when it is rotated by drive means, the sleeve having a feed inlet (3) made of elastomer mixtures and an outlet (4) opening in an extrusion die (21) mounted on a support (20), characterized in that the frame (11) is mounted to move in translation relative to the support (20) of the die (21) in a direction parallel to the longitudinal axis (X-X ') between a first position in which the sleeve (1) and the support (20) are in sealing contact to allow the mixture of elastomers to pass through the die (21) and a second position in which the sleeve (1) is spaced from the die (21) for performing the cleaning, and in that said device comprises an automatic coupling mechanism (40) for rapidly locking and unlocking the sheath (1) and the die (21) and allowing the frame (11) to move between the two positions.
    [0002]
    2) Device according to claim 1, characterized in that said automatic coupling mechanism (40) comprises a screw-type system and nut and a drive mechanism for rotation (41) of the screw or the nut.
    [0003]
    3) Device according to one of claims 1 or 2, characterized in that the carrier (20) comprises a first ring (25) having inclined ramps, which is coaxial with a second ring (5) integral with the end outlet of the sheath (1) and in that the second ring (5) comprises inclined ramps which are made to cooperate with the inclined ramps of the first ring (25).
    [0004]
    4) Device according to claim 3, characterized in that the inclined ramps of said first and second ring are formed as a plurality of tenons (6, 26) uniformly distributed over the circumference of each ring, the tenons (6) d a ring being able to slide axially in the spaces existing between the tenons (26) of the other ring.
    [0005]
    5) Device according to one of claims 2 to 4, characterized in that said rotary drive mechanism (41) comprises a toggle device (42) hingeably connecting one of the rings (25) to the rod (43) of a cylinder (44) actuating in translation.
    [0006]
    6) Device according to one of the preceding claims, characterized in that it comprises control means opening and closing of the automatic coupling mechanism.
    [0007]
    7) Device according to one of the preceding claims, characterized in that the extruder (10) delivers in the gap formed between a first roller and a second roller which are rotatable and are rotated in opposite directions around axes parallel to each other and perpendicular to the longitudinal axis (X-X ') of the sleeve (1).
    [0008]
    8) A method of cleaning an extruder intended to operate with mixtures of elastomers comprising a frame (11) supporting a screw (2) and a sheath (1), the screw (2) being rotated in the sheath ( 1) when it is rotated about the longitudinal axis (X-X ') of the sheath (1) by drive means, the sheath (1) having a feed inlet (3) made of mixtures of elastomers and an outlet (4) opening into an extrusion die (21) mounted on a support (20), the method comprising the following steps: - unlocking the sleeve (1) of the support (20) of the die (21 ) by means of an automatic coupling mechanism (40) for rapidly locking and unlocking the sleeve (1) and the support (20), - displacing the frame (11) in translation relative to the support (20) of the die (21) in a direction parallel to the longitudinal axis (X-X ') between a first positio n in which the sleeve (1) and the support (20) of the die (21) are in sealing contact to allow the mixture of elastomers to pass through the die (21) and a second position in which the sleeve (1) ) is removed from the die (21) to allow cleaning, drive the screw (2) in rotation to drain the extruder (10).
    [0009]
    9) Method according to claim 8, characterized in that the rotational drive of the screw (2) in the second position of the frame (11) is in the same direction as that of rotation of the screw (2) when the frame (11) is in the first position.
    [0010]
    10) Method according to one of claims 8 or 9, characterized in that the translational movement of the frame (11) is a distance at least equal to the distance between the downstream end of the screw (2) and that of the die (21).
    [0011]
    11) Method according to one of claims 8 to 10, characterized in that the die (21) has a convergent shape.
    [0012]
    12) Method according to one of claims 8 to 11, characterized in that the sheath (1) comprises attachment means of the elastomer mixture which are active during the movement of the frame (11) between the two positions.
    [0013]
    13) Method according to one of claims 8 to 12, characterized in that the extruder (10) delivers in the gap formed between a first roller and a second roller which are rotatable and are rotated in opposite directions around axes parallel to each other and perpendicular to the longitudinal axis (X-X ') of the sleeve (1).
    [0014]
    14) Method according to claim 13, characterized in that, when the frame (11) is in the second position, said first and second rollers are driven to evacuate the remaining mixture.
    类似技术:
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    同族专利:
    公开号 | 公开日
    US20180194054A1|2018-07-12|
    CN107848179A|2018-03-27|
    EP3325248B1|2021-03-31|
    US10889043B2|2021-01-12|
    FR3038862B1|2017-07-21|
    EP3325248A1|2018-05-30|
    CN107848179B|2020-03-31|
    WO2017013080A1|2017-01-26|
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    CN109676893B|2018-12-24|2021-01-26|上海新塔星石材发展有限公司|Extrusion equipment for producing and processing high polymer elastic material|
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    优先权:
    申请号 | 申请日 | 专利标题
    FR1556801A|FR3038862B1|2015-07-17|2015-07-17|DEVICE AND METHOD FOR CLEANING AN EXTRUDER FOR MIXTURES OF ELASTOMERS|FR1556801A| FR3038862B1|2015-07-17|2015-07-17|DEVICE AND METHOD FOR CLEANING AN EXTRUDER FOR MIXTURES OF ELASTOMERS|
    EP16741602.3A| EP3325248B1|2015-07-17|2016-07-18|Device and method for cleaning an extruder for elastomer mixtures|
    PCT/EP2016/067085| WO2017013080A1|2015-07-17|2016-07-18|Device and method for cleaning an extruder for elastomer mixtures|
    CN201680041499.8A| CN107848179B|2015-07-17|2016-07-18|Apparatus and method for cleaning an extruder of an elastomer mixture|
    US15/742,173| US10889043B2|2015-07-17|2016-07-18|Device and method for cleaning an extruder for elastomer mixtures|
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