| 摘要 |
The present invention relates to an injection-moulding machine comprising a hot runner for feeding a plasticized melt into a mould, a shut-off needle for optionally closing or opening the hot runner, a piston, which is connected to the shut-off needle, is arranged in a housing with an opening and divides the housing into a first chamber and a second chamber, and a covering plate with a first and a second fluid outlet, wherein the housing has a first fluid inlet, which is in connection with the first chamber, and a second fluid inlet, which is in connection with the second chamber, which are arranged in such a way that fluid can be transferred via the first fluid outlet of the covering plate into the first fluid inlet of the housing and fluid can be transferred via the second fluid outlet of the covering plate into the second fluid inlet of the housing, and so fluid can be applied to the piston from both sides, wherein the second chamber is arranged on the side of the piston that is facing the covering plate. In order to provide an injection-moulding machine of the type mentioned at the beginning in which an optimal fluid transfer between the covering plate on the one hand and the housing on the other hand is ensured even when there are relatively great changes in the temperature of the hot runner block, it is proposed according to the invention that the second fluid inlet opening of the housing and the second fluid outlet opening of the covering plate differ in their cross-sectional areas and/or are at different distances from the axis of the shut-off needle, wherein an adapter element with a fluid inlet opening and a fluid outlet opening is provided and is designed in such a way that the fluid provided by the covering plate via the second fluid outlet opening can be conducted via the fluid inlet opening into the adapter element and via the fluid outlet opening from the adapter element into the second fluid inlet opening of the housing.
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