Weighing scales – Discharge from weigher to receiver
Patent
1987-07-22
1989-03-07
Miller, Jr., George H.
Weighing scales
Discharge from weigher to receiver
177114, 177185, G01G 1316, G01G 1324, G01G 2310
Patent
active
048097950
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a hopper-type weighing device for regulating the throughflow of material as well as the weighed-out quantity for the extrusion of plastics, comprising a weighing container provided with a discharge flap, a casing designed in two parts, receiving the weighing container with the weighing bar in the upper part and closed in the shape of hopper in the lower part, a material feed nozzle mounted on the casing cover-plate and an outlet chute which is connected to the lower casing component and in which a level switch calling for the next batch to be weighed is installed.
Since hopper-type weighing devices of the above-mentioned type have to be so arranged as to be unaffected by the drive vibrations of the extruder, up until now it has been usual to suspend them free from vibration on a separate support frame. This frame, standing on the shop floor and designed as an accessible platform, for its part requires, however, a considerable structural outlay and a not inconsiderable headroom. The latter is often not available, particularly in the case of machines originally planned without hopper-type weighing device, wich therefore makes retrofitting with such hopper-type weighing devices attached in the known form impossible. A further disadvantage which both makes the system more expensive and additionally increases the headroom is that a flexible connecting piece always has to be provided between the conventional hopper-type weighing devices and the extruder inlet.
The object of the invention is to create a hopper-type weighing device which manages without its own support frame, so that there is neither the associated structural outlay nor the unfavorable large headroom.
In accordance with the present invention, there is provided a hopper-type weighing device for the extrusion of plastics, in which a weighing container has a discharge flap. A casing with two parts receiving the weighing container with a weighing bar in the upper part. The lower part of the casing is closed and is in the shape of a hopper. A material feed nozzle is mounted on the casing cover plate, and an outlet chute is connected to the lower casing component. A limit switch calls for the next batch to be weighed, and is installed in the lower casing component. The casing cover plate carries the weighing container with the weighing bar and is supported via distance elements and vibration dampers, on the lower hopper-shape casing component. An elastic hose member surrounds the weighing container, and is secured at both ends in a sealed manner. The elastic hose member extends between the casing cover plate and the lower casing component.
To achieve the object set, a hopper-type weighing device with the features emerging from the claims is proposed.
An exemplary embodiment of the subject-matter of the application will be explained below with reference to the drawings, in which specifically,
FIG. 1 shows the diagrammatic side view of a hopper-type weighing device according to the invention, and
FIG. 2 shows the hopper-type weighing device described, in plan view.
The hopper-type weighing device depicted is intended for regulating the throughflow of material as well as the weighed-out quantity for the extrusion of plastics. It is mounted on the extruder 1 with an outlet chute 2, in which a level switch 3 calling for the next batch to be weighed is located. A lower hopper-shaped casing component 4 is screwed to the outlet chute 2 via a flange connection.
The lower hopper-shaped casing component 4 carries a casing plate 5, from which semi-circular distance pieces 6 disposed thereupon extend upward. These distance pieces 6 are connected via vibration dampers 7 to a casing cover-plate 9 receiving a central material feed nozzle 8. Suspended from the casing cover-plate is the likewise hopper-shaped weighing container 11, which is provided with the weighing bar 10 and to which a discharge flap 12, controlled by the level switch 3, is hinged.
Since the weighing operation has to take place in an enclosed space on account of the generation
REFERENCES:
patent: 2822577 (1958-02-01), Schieser et al.
patent: 2853105 (1958-09-01), Brown
patent: 3618684 (1971-11-01), Burke et al.
Fogiel Max
Miller Jr. George H.
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