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CN-115087534-B - Injection unit for multicomponent injection molding

CN115087534BCN 115087534 BCN115087534 BCN 115087534BCN-115087534-B

Abstract

The invention relates to an injection unit for multicomponent injection molding using a plastic injection molding machine, comprising two plasticizing units (1, 2) which are arranged one above the other on a support (3), and each plasticizing unit (1, 2) is designed to produce a melt and to inject the melt into a molding tool. In order to achieve a significant simplification when changing the lower plasticizing unit, it is proposed according to the invention that the upper plasticizing unit (2) is pivoted relative to the lower plasticizing unit (1) about a suitably arranged horizontal axis (9, 12) upwards into the maintenance position and thereby a space is created for free access to the lower plasticizing unit. By means of suitable support elements (10, 13), the upper plasticizing unit (2) can be held in a maintenance position. The upper plasticizing unit (2) can be pivoted together with a support frame (8) supporting the upper plasticizing unit into a maintenance position via a first rotational axis (9) or via a second rotational axis (12) relative to the support frame (8).

Inventors

  • S. Klaus
  • S. Hobmeier
  • S. Kleipsch
  • U. SCHNEIDER

Assignees

  • 克劳斯玛菲科技有限公司
  • 克劳斯玛菲科技有限公司

Dates

Publication Date
20260421
Application Date
20210209
Priority Date
20200212

Claims (17)

  1. 1. Injection unit for multi-component injection molding with a plastic injection molding machine, comprising two plasticizing units arranged one above the other on a carrier (3), a lower plasticizing unit (1) and an upper plasticizing unit (2) arranged above it, each plasticizing unit being configured for preparing a melt and injecting the melt into a molding die via a nozzle of the two plasticizing units that is in butt joint or pressed onto the molding die, The upper plasticizing unit (2) is pivotable relative to the lower plasticizing unit (1) about a horizontal axis of rotation (9, 12) between at least two positions, a first position as an operating position in which the lower plasticizing unit (1) and the upper plasticizing unit (2) can be placed in connection with a forming die, and a second position as a maintenance position in which the connection with the forming die is made by bringing the two plasticizing units out of the operating position towards the forming die and by abutting or pressing the nozzles of the two plasticizing units onto the forming die, a support element (10, 13) is provided in which the upper plasticizing unit (2) can be held in the maintenance position, the support element (10, 13) being rotatable about a horizontal support element axis of rotation (11, 14) and being placed in at least two positions, i.e. in which the upper plasticizing unit (2) is in the rest position when the upper plasticizing unit (2) is in the operating position, and in which the support element (13) is in the rest position when the upper plasticizing unit (2) is in the maintenance position is in the rest position.
  2. 2. An injection unit according to claim 1, The upper plasticizing unit (2) is pivotable out of the operating position by a predefinable pivot angle (alpha) relative to the operating position, wherein a predefinable reference point on the longitudinal axis of the upper plasticizing unit (2) is at a predefinable vertical distance from the longitudinal axis of the lower plasticizing unit (1).
  3. 3. An injection unit according to claim 1 or 2, The device is characterized in that a support frame (8) is provided, which extends at least in sections above the lower plasticizing unit (1), the support frame (8) being supported by the lower plasticizing unit (1) or being releasably connected thereto, and the upper plasticizing unit (2) being fastened and supported on the support frame.
  4. 4. An injection unit according to claim 3, Characterized in that the upper plasticizing unit (2) is releasably fastened and supported on the support frame (8).
  5. 5. An injection unit according to claim 3, Characterized in that the support frame (8) is pivotably connected to the support (3) about a horizontal rotation axis (9), the position of the horizontal rotation axis (9) being selected such that the upper plasticizing unit (2) can be pivoted together with the support frame (8) between the operating position and the maintenance position.
  6. 6. An injection unit according to claim 3, Characterized in that the upper plasticizing unit (2) is connected to the support frame (8) in an articulated manner such that the connection forms a horizontal rotation axis (12), about which horizontal rotation axis (12) the upper plasticizing unit (2) can be pivoted relative to the lower plasticizing unit (1) between the operating position and the maintenance position.
  7. 7. An injection unit according to claim 6, Characterized in that a front support element (20) and a rear support element (21) are provided on the support frame (8), the weight of the upper plasticizing unit (2) being supported on the front support element and the rear support element, the upper plasticizing unit (2) being connected to the rear support element (21) in a hinged manner and being releasably fastened to the front support element (20).
  8. 8. An injection unit according to claim 1 or 2, Characterized in that the support element (10, 13) can be locked in the folded-in position and/or in the folded-out position.
  9. 9. An injection unit according to claim 3, Characterized in that a support element (10) is mounted on the support frame (8) and in that the support element (10) is rotatable relative to the support frame about a horizontal support element rotation axis (11).
  10. 10. An injection unit according to claim 1 or 2, Characterized in that a support element (13) is mounted on the upper plasticizing unit (2), and in that the support element (13) is rotatable relative to the upper plasticizing unit about a horizontal support element rotation axis (14).
  11. 11. An injection unit according to claim 1 or 2, The device is characterized in that a support element (10, 13) is provided, the support element (10, 13) being designed and arranged such that, in the folded-out position of the support element (10, 13), a section of the upper plasticizing unit (2) located in front of the rotation axis (9, 12) for pivoting the upper plasticizing unit (2) is supported on the support (3) and/or the lower plasticizing unit (1) via the support element (10, 13), and the upper plasticizing unit (2) can be reliably held in the maintenance position.
  12. 12. An injection unit according to claim 1 or 2, Characterized in that the upper plasticizing unit (2) comprises a first plasticizing part (23 a) and a first driving part (23 b), which are releasably connected to each other at an interface (25).
  13. 13. An injection unit according to claim 1 or 2, Characterized in that the lower plasticizing unit (1) comprises a second plasticizing part (22 a) and a second driving part (22 b), which are releasably connected to each other at an interface (24).
  14. 14. An injection unit according to claim 1 or 2, Characterized in that a support element (13) is mounted on the upper plasticizing unit (2) and the support element (13) is rotatable relative to the upper plasticizing unit about a horizontal support element rotation axis (14), the upper plasticizing unit (2) comprising a first plasticizing part (23 a) and a first driving part (23 b) which are releasably connected to each other at an interface (25), and the horizontal support element rotation axis (14) is arranged at the interface (25) or on the side of the interface (25) where the first driving part (23 b) is arranged or on the first driving part (23 b) itself.
  15. 15. An injection unit according to claim 14, Characterized in that the horizontal support element rotation axis (14) is arranged on the underside of the first drive part (23 b).
  16. 16. An injection unit according to claim 12, Characterized in that a support element (10, 13) is provided, the support element (10, 13) being configured and arranged such that in the flipped-out position of the support element (10, 13) the first drive part (23 b) of the upper plasticizing unit (2) is supported and can be reliably held in the maintenance position.
  17. 17. An injection unit according to claim 16, The support element (10, 13) is designed and arranged in such a way that in the folded-out position of the support element (10, 13) the first drive part (23 b) of the upper plasticizing unit (2) is supported and can be held securely in the maintenance position in the state of the first plasticizing part (23 a) being released or separated from the first drive part (23 b).

Description

Injection unit for multicomponent injection molding Technical Field The invention relates to an injection unit for multicomponent injection molding using a plastic injection molding machine, comprising two plasticizing units, which are arranged one above the other. Background It is known from the prior art that for multicomponent injection molding, an injection unit is provided with a plurality of plasticizing units for preparing the respectively required melt components and injecting the solutions into the molding die, different arrangements of the plasticizing units with respect to one another and with respect to the molding die being possible (Dr. -ing.friedrich Johannaber, plastics machine operator (Kunststoff-MASCHINENF u hrer), fourth edition, 2004, page 236, fig. 164). In one of these known arrangements, a first lower plasticizing unit is provided, which is assigned to a central injection point arranged in the middle of the molding die. A second upper plasticizing unit is arranged obliquely above it, which is associated with the above-mentioned injection point above the centrally located injection point. In injection units of this type, it is known to move the upper plasticizing unit (DE 4229254A1, DE202010002747U 1) relative to the lower plasticizing unit in the machine longitudinal direction by means of a linear drive. Irrespective of the above-described aspects of the method of moving the upper plasticizing unit relative to the lower plasticizing unit, it may be necessary to replace the plasticizing part of the lower plasticizing unit with another plasticizing part. This may be the case, for example, when the plasticized component of the plasticizing unit has serious defects that necessitate replacement. Furthermore, if other materials or colors are to be processed, the plasticized component may have to be replaced. High wear and therefore failure of the plasticized component can also occur in the case of corrosive materials, which likewise leads to replacement. It is known that almost all connections between the upper plasticizing unit and the lower plasticizing unit have to be released for such a replacement and that the upper plasticizing unit as a whole is lifted up from the lower plasticizing unit by means of a crane and lowered down behind the lower plasticizing unit or at another location on the support. Thus, the lower plasticizing unit is freely accessible. After the replacement of the lower plasticizing unit, the upper plasticizing unit is lifted from the support by means of a crane, moved over the lower plasticizing unit and reconnected to the lower plasticizing unit. A disadvantage of this is the relatively high time expenditure associated with this. The above applies in a sense if only the plasticizing part of the plasticizing unit has to be replaced. In this case, it is sufficient to remove only the plasticizing part from the upper plasticizing unit and to put it down in another position. Disclosure of Invention The present invention is based on the object of providing an injection unit with which a considerable simplification and time saving can be achieved when changing the plasticizing part of the plasticizing unit. The gist is based on the basic idea to pivot the upper plasticizing unit about a suitably arranged axis, thereby establishing a space for free access to the lower plasticizing unit. In particular, free access can be produced when the plasticizing part of the upper plasticizing unit is also removed. According to the invention, it is therefore provided that the upper plasticizing unit can be pivoted relative to the lower plasticizing unit about a horizontal axis of rotation between at least two positions, namely a first position as an operating position in which the two plasticizing units can be placed in connection with the molding tool and a second position as a service position in which the upper plasticizing unit is pivoted upward relative to the operating position out of the operating position. In this context, the "operating position" means that the injection unit and thus also the two plasticizing units are in a position along the longitudinal axis of the machine in which the injection unit is at a suitably large distance from the mold platen closest to the injection unit. The distance is dimensioned such that the upper plasticizing unit can pivot freely movably between the two positions. Furthermore, the distance should be dimensioned such that good access to the lower plasticizing unit is ensured. In this position, the two plasticizing units can be placed in connection with the molding die, in particular with the molding die halves located on the die platens assigned to the injection units. This mold platen is also referred to as a nozzle plate. Typically, it involves a stationary mold platen. The connection to the forming die is performed by moving the two plasticizing units out of the operating position towards the forming die and by abutting or pressing the n