In Particular A Twin Screw Extruder
In Particular A Twin Screw Extruder, that allows for the replacement of the single screw extruder without dismounting the same. The diverter valve includes a valve housing with a first flow passage, which can be fastened indirectly or directly to an extruder cylinder, whereby the valve housing can be arranged on the extruder cylinder with the first flow passage aligned with the screw area. The cross section of the first flow passage is constructed large enough to pass extruder screws arranged in the extruder through the flow passage. The diverter valve further includes a valve bolt having its axis arranged basically perpendicular in relation to the direction of flow of a liquid or a melt, with at least an additional flow passage, which can be oriented in alignment with the first flow passage of the valve housing and whose cross section is likewise constructed large enough to pass extruder screws arranged in the extruder through this second flow passage, whereby the valve bolt is arranged adjustably in the valve housing.
This objective is accomplished by providing a diverter valve for an sheet production extruder, especially a twin- screw extruder, including a valve housing with a first flow passage, which can be fastened indirectly or directly on an extruder cylinder, whereby the valve housing can be arranged on the extruder cylinder with a first flow passage that can be arranged in alignment with the screw area, and the cross section of the first flow passage is constructed large enough in order to pass extruder screws arranged in the extruder through the flow passage, as well as a valve bolt arranged with its axis basically perpendicular to the direction of flow of a liquid or a melt in the valve housing, with at least one further through flow passage which can be arranged in a position that is aligned with the first flow passage of the valve housing and whose cross section is likewise constructed large enough to pass the extruder screws arranged in the extruder through this second flow passage, whereby the valve bolt is arranged adjustably in the valve housing.
Accordingly, a valve housing with a first flow passage is connected to the extruder. The valve housing accommodates a valve bolt, the axis of which is arranged basically perpendicular to the direction of flow of the fluid or the melt. The valve bolt has a second flow passage, which can be matched with the first flow passage of the valve housing to produce a general opening through the diverter valve. The two flow passages are constructed in terms of their dimension such that the extruder screws arranged in the extruder can be drawn through the overall flow passage. In this way, a diverter valve does not represent any hindrance for dismounting or mounting the extruder screws. If a twin- screw extruder is used, the flow passages can preferably be constructed in the form of spectacle-type (eyeglass shaped) bore holes.
The present invention guarantees, in a simple manner, that when using a diverter valve, it is not necessary to forego simple dismounting of extruder screws.
The foregoing disclosure has been set forth merely to illustrate the single screw extruder and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and twin screw extruder.