Patent Application
20170101333
The instant application claims the priority date of Oct. 7, 2015, the filing date of the German patent application DE 20 2015 006 975.4.
The invention relates to a closing mechanism for mold halves of a glassware forming machine.
These closing mechanisms for glassware forming machines are known in a variety of forms. For example, DE 33 46 466 A1 describes a device for opening and closing the preforms of a glassware forming machine, in which the opening and closing movement is established by the parallel movement of two mold halves caused by a drive, which conveys the vertically directed linear movement of a piston-cylinder unit via interspersed levers to two crankshafts extending parallel to and spaced apart from each other, whose rotational movements are converted by these connected cranks into uniform, opposite movements of the mold halves. The piston-cylinder unit along with the remaining elements of the drive are laterally at the same height as the mold halves.
Another device comparable to the above is known from DE 695 09 946 T2, in which the drive elements for a parallel closing mechanism of a glassware forming machine are positioned laterally at the same height with the mold halves. The drive is otherwise characterized by a piston-cylinder unit.
The disadvantage of these known embodiments is that the lateral drive elements take up installation space on the station box, so that the latter is not available at this location for other functional elements. Establishing reliable lubrication requires a central lubricating connection in addition to a line system that incorporates the latter, wherein excess lubricating oil must be caught in a collection tank. The use of Teflon-coated tin cans that serve to reduce wear in linkage mechanisms, e.g., toggle-lever mechanisms, does not make sense, since rotation under a load destroys the Teflon coating and yields a clearance that detracts from a positionally accurate, in particular reproducible, movement of the mold halves during a closure movement. Subsequent lubrication is also not possible during the ongoing operation of the glassware forming machine. Finally, the drivetrains known from the state of the art enable only a very incomplete application of the advantages associated with a servomotor in view of the rotor position, which changes constantly due to wear.
EP 0555 956 A1 describes a forming mechanism for the mold halves of a glassware forming machine that can move parallel to each other between an opening and closing position, in which the vertical movement of the piston rod of a piston-cylinder unit is converted by means of a coupler mechanism comprised of two connection pieces into two horizontally oppositely directed partial movements making up the closing and opening movement of the mold halves. This mechanism has essentially come to be further configured in such a way that the closing position of the molds relative to the central axis of this mechanism is set by aligning the effective direction of the piston rod. This mechanism is characterized by the fact that, in the closing position of the two connection pieces, only a small portion of the force conveyed via the piston-cylinder unit is available as a closing force.
The parallel closing mechanism for the mold halves of a glassware forming machine described in WO 2010/102590 A2 is characterized by the fact that a separate drive is allocated to each mold half. To this end, two drivetrains are provided, each of which consists of a suspended motor and a planetary gear, whose initial movement can be converted by means of a disk that eccentrically accommodates a bolt into a back-and-forth, opening and closing movement of the mold carriers bearing the mold halves. The use of two separate drivetrains provides a comparatively complex structure.
The object of the invention is to improve a parallel closing mechanism of the kind noted above from the standpoint of wear and maintenance with an eye toward a simple constructive design. This object is achieved in such a parallel closing mechanism according to the present invention.
It is essential to the invention that all components of the drivetrain are accommodated under an upper side of the station housing, wherein the mold holders are mounted on a guide located inside of a lateral housing section above the upper side of the station housing. As a consequence, the lower side of this housing section establishes a connection to the drivetrain. When needed, the upper side of the station housing comprised of the plate or a cover offers the ability to remove the complete drivetrain via the specified upper side out of the station housing or build it into the latter. This significantly simplifies repair and maintenance work, since the complete station housing had to be replaced if damage occurred to the gearing in known embodiments of closing mechanisms, which is associated with a significantly increased level of effort.
The drivetrain preferably is suspended under the housing section. Accordingly, the closing mechanism according to the invention can be upwardly completely removed from the station housing and inserted the other way.
The guide is preferably a linear guide and accommodated inside of the lateral housing section. As a consequence, a parallel closing mechanism is preferably involved. The guide system can be established by sliding bushes guided on steel rods or also by precision rails, which bear guiding elements mounted on rolling elements.
The drive used as described in the invention is preferably one that generates a vertically directed linear movement on the outlet side. To this end, all drives known to the practitioner in the relevant technology can basically be used for this purpose.
The present invention contemplates advantageous drives that are structurally easy to create. Conceivable here, for example, is a motor whose vertically extending axis is drivingly connected with a threaded spindle, which can be used to create a vertically linear movement by way of a threaded sleeve. However, another possibility involves a pneumatically activatable piston-cylinder unit, whose axis extends vertically.
According to an embodiment, the mold holders are mounted by means of mounting plates, which are mounted on the guide via guide elements. This can be accomplished using both rolling elements and sliding bushes.
The gearing of the drivetrain preferably is set up in such a way that the inlet side, vertically oriented linear movement branches into two horizontally directed movements that are opposite each other, yet symmetrical relative to a vertical central plane. These are the movements to be directly conveyed to the mentioned mounting plates.
According to an embodiment, the gearing preferably is a toggle lever mechanism or at least encompasses a toggle lever mechanism.
With regard to lubrication aspects, according to one embodiment, an oil bath is provided, which completely accommodates at least the gearing, so that a distinct reduction in wear can be achieved as the result of permanent contact with lubricating oil. Another advantage to the oil bath lies in the fact that wear-resistant bushes pressed into the gearing area can be used. The oil bath is designed to make checking fill levels easy, thereby enabling a timely refilling as needed. In addition to the mentioned gearing, the oil bath can also include parts of the drive, such as a threaded spindle, a piston rod, etc.
According to the invention, the gearing preferably is mounted by means of the receptacle that accommodates the oil bath. The receptacle comprises an assembly that is easy to install in the station housing or remove therefrom. Thus, the closing mechanism according to the invention is situated so that it can be easily and quickly changed out.
According to a further embodiment of the invention, the lubricating system may be a central lubricating system, which is used to supply parts outside of the oil bath that require lubrication. This relates in particular to the above-noted guide along with the guiding elements that interact with the latter. Significant here is that each lubrication point is equipped with its own lubricant line, proceeding from a lubricating oil distributor. This opens the door to being able to individually check the function of the lubricating supply for each lubrication point. Lubrication is preferably triggered at intervals in conjunction with a machine controller.
According to a further embodiment, a toggle-lever mechanism according to the invention may be accommodated completely inside of the station housing, under the above-noted upper side and inside of the oil bath.
According to another embodiment, the toggle-lever mechanism is mounted in the receptacle that accommodates the oil bath.
As evident, the closing mechanism according to the invention provides an easily reparable, kinematically clear system that also incorporates lubrication aspects.
The invention will be explained in greater detail below with reference to the exemplary embodiment depicted in the drawings. Shown on:
A globally square station housing is marked 1 on
As yet to be described below, the housing section 3 is set up to accommodate the structural elements intended for linearly guiding the mold holders 4, 5 in the direction of the arrows 6, wherein a motor along with accompanying gear elements are accommodated under the housing section 3, and hence inside of the station housing 1.
Reference will additionally be made below to
The mold holders 4, 5 are secured to mounting plates 9, 10, which comprise the linking member to the remaining elements of the drivetrain of the closing mechanism. The drivetrain consists of a motor 11, whose axis also extends vertically inside of the station housing 1 and is joined with a uniaxial threaded spindle 12, which is set up by way of a threaded sleeve 13 for introducing a vertically directed linear movement in a toggle-lever mechanism 14.
The mounting plates 9, 10 are joined with a horizontal linear guide 19, which is formed by a rail profile, along which the opening and closing movement of the mold halves 7, 8 is set up. The rail profile of the linear guide 19 is situated inside the housing section 3, and provided with beveled upper and lower sides that run symmetrically to a vertical central plane, against which abut guiding elements 20 mounted via cylindrical rolling elements 40 and fastened to the mounting plates 9, 10.
The toggle-lever mechanism 14 encompasses a central shaft 15, which is joined by a lever 16 and intermediate lever 17 with a rod 18, which for its part is set up to transfer a vertical movement, and in so doing to introduce a rotational movement into the shaft 15.
The shaft 15 is provided with two spherical bearings 21, 22 lying symmetrically opposite each other, into which are hinged levers 23, 24 that for their part are joined with spherical bearings 25, 26 non-rotatably connected with shafts 27, 28 by means of intermediate levers 29, 30. The overall system comprised of the shafts 15, 27 and 28, the levers 23, 24 along with the intermediate levers 29, 30 forms a symmetrical structure relative to the central shaft 15, so that turning the shaft 15 or linearly moving the rod 18 can create symmetrically opposite rotational movements of the shafts 27, 28.
The mounting plates 9, 10 are each hinged by way of a bolt 31, 32 to an intermediate lever 33, 36, which for its part is non-rotatably connected with the shaft 27, 28 by means of a connecting lever 34, 35, thereby forming a knee joint on the sides of the shafts 27, 28 facing each other. Due to the symmetrical characteristics of the toggle-lever mechanism 14 relative to a vertical central plane running through the shaft 15, vertical movements of the drive thus create movements of the mounting plates 9, 10, and hence of the mold halves 7, 8, that are identical, yet opposite to each other.
Arrows on
Essential in this regard is that all elements of the drive are arranged under the upper side 2 of the station housing, so that this upper side 2 can be used as a modular plate.
As may be gleaned in detail from
The shafts 15, 27, 28 of the toggle-lever mechanism 14 are mounted in the walls of the receptacle 38, so that the suspended arrangement of the drivetrain makes it possible to insert or remove the closing mechanism as a uniform assembly via the upper side 2 of the station housing 1.
As evident, the gearing, here essentially a toggle-lever mechanism 14, present between the drive, here the motor 11, and mounting plates 9, 10 is exposed to an especially reliable lubrication effect, since it is accommodated in an oil bath.
A central lubricating system is provided for other components to be lubricated, here in particular the linear guide 19 and the guiding elements 20 interacting with the latter, the central lubricating interacting interacts with a lubricant pump (not shown in the drawings) to establish a connection with the individual lubrication points. In this conjunction,
Lubrication is initiated in conjunction with a machine controller based on selectable points in time, wherein, if a line section 41, 42, 45 were to be jammed or no flow were to be on hand for some reason, an interference signal is triggered, so that the function of the lubricant system is in this regard automatically monitored.
The features of the subject matter of this invention set forth in the above description, the patent claims, the abstract and the drawings can be used individually and in any desired combination for the realization of the invention in its various embodiments.
The specification incorporates by reference the disclosure of DE 20 2015 006 975.4, filed Oct. 7, 2015.
The present invention is, of course, in no way restricted to the specific disclosure of the specification and drawings, but also encompasses any modifications within the scope of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202015006975.4 | Oct 2015 | DE | national |
