Fluid sprinkling – spraying – and diffusing – With heating or cooling means for the system or system fluid – Heating means
Patent
1991-05-03
1992-08-25
Kashnikow, Andres
Fluid sprinkling, spraying, and diffusing
With heating or cooling means for the system or system fluid
Heating means
239390, 239591, 239600, B05B 124
Patent
active
051411555
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a nozzle for injection of thermoplastic, thermosetting plastic or rubber, said nozzle comprising a nozzle housing with heating members and an interchangeable wear pipe which is surrounded by a supporting pipe retained in said housing, and at the outlet end of the nozzle ends in a nozzle tip.
The nozzle is especially intended to be used as an injection-moulding nozzle between a tool (mould) and an injection unit (worm) even though it may also be used in other connections, e.g. as an extrusion nozzle.
The nozzle with interchangeable wear pipe and nozzle tip is known, e.g. from the specification of DE-OS No. 34 31 173 and the specification of DK Patent Application No. 5069/86. In the nozzle referred to in the first-mentioned Published Patent Specification, every time it is desired to change the nozzle tip, it is necessary to take down and separate the tool which will often require several hours' work. However, in the nozzle according to the Danish Patent Application, wear pipes with different nozzle tips are easy to change as they can be withdrawn from the supporting pipe without it being necessary to separate the tool. Moreover, the position of the nozzle tip relative to the inlet of the tool may be adjusted by mounting a washer of a suitable thickness between the rearmost, conical part of the wear pipe and an end piece of the supporting pipe.
It is the object of the invention to provide a nozzle of the kind in question comprising an easily interchangeable wear pipe and nozzle tip, where the position of the nozzle tip in the inlet of the tool (injection hole) may be adjusted in a faster and easier manner without it being necessary to take down the tool from the machine, and the adjusted position is surely maintained.
According to the invention this is obtained by the nozzle tip being provided with an external thread engaging an internal thread at the outlet end of the nozzle housing, and the wear pipe at the inlet end thereof or the transition piece at one end thereof having an external thread engaging the internal thread of a counter nut capable of abutting on an end surface of the nozzle housing, and means for intervening with a tool to rotate the wear pipe for adjusting the position thereof in the nozzle housing.
The wear pipe with nozzle tip screwed into the nozzle housing may be moved up and down in the housing by being rotated with a tool, preferably an Allen key, said tool being inserted in the inlet end of the wear pipe, which is formed with a corresponding cross section, it thereby being possible to bring the nozzle tip into position opposite the outlet end of the nozzle housing or the injection hole of a tool wherein the nozzle is placed. After mounting of the tool, one or more "test shots" are made and the moulded article is evaluated, whereupon the position of the tip is changed by drawing the injection unit (worm) so far back that it is possible by hand to insert the Allen key in the nozzle from behind and change the position of the nozzle tip by rotating the wear pipe. During the injection moulding the counter nut acts as a shock absorber which safeguards the thread of the nozzle tip. In injection moulding in multiple tools, the counter nut may be formed as a gear-wheel having an internal thread engaging an external thread of a transition piece which is clamped at the extended portion of the wear pipe, e.g. by pointed screws. Thereafter, toothed bars engaging the gear wheels may be used for fine adjustment of the position of the nozzle tip in the injection hole of the tool and, moreover, as nozzle adjustment indicators and, if desired, they may be connected to a driving mechanism which is controlled e.g. by temperature or pressure sensors mounted close to the nozzle tip so that it is possible to carry out a continuous, automatic adjustment.
Further embodiments and constructive features of the nozzle according to the invention are stated in the dependent claims and are explained in the following with reference to the drawing, in which
FIG. 1 shows an embodiment of the no
REFERENCES:
patent: 4651928 (1987-03-01), Schmidt
patent: 4678125 (1987-07-01), Elston
Dan-Tip A/S
Kashnikow Andres
Morris Lesley D.
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