Glass manufacturing – Molten glass dispensing means – Discharge orifice below melt level
Patent
1982-11-29
1984-09-25
Lindsay, Jr., Robert L.
Glass manufacturing
Molten glass dispensing means
Discharge orifice below melt level
65165, 65334, 83600, 83623, C03B 712
Patent
active
044733895
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase application corresponding to PCT/EP 82/00054 filed Mar. 13, 1982 and based upon German application P 31 1334.5 filed Apr. 2, 1981 under the International Convention.
1. Field of the Invention
The invention relates to a feeding device having a dish with a bottom opening to which an up and down moving stopper surrounded by a pipe is attached, a cutting device being provided under the bottom opening of the feeding device.
BACKGROUND OF THE INVENTION
The object of such a feeding device is to ensure the supply of a continuously flowing glass strand and to divide it into predetermined fragments (gobs), thus establishing the weight of the individual fragments and thereafter to proceed with the final sectioning. A coupling, mostly electrical, to the subsequently connected glass forming machine synchronizes the movements of the cutting device with the glass forming machine. It is known to activate the drives of the moving mechanical parts of such a feeding, device by compressed air, this, however, has a number of disadvantages, as discussed below.
If, for instance, a movement is to be generated by expanding compressed air, a delay occurs between the actuation of the air release valves and the beginning of the movement, as in the case of a piston in a cylinder. This is a consequence of the compressibility of the air and depends, among others, on the length of the piping, its clear cross section and the prevailing air pressure. A precise control, especially in the case of rapid switch sequences, becomes more and more difficult particularly when large masses are to be moved.
Another very important disadvantage is that a compressed air cylinder as a drive unit can have only an either/or position. For instance, air pressure applied at one end of the piston of the cylinder and presses it with built-up pressure until the piston reaches the opposite end of travel. The same applies to the return travel. It is not possible to stop the piston in a determined intermediate position, since, due to the compressibility of the air, a change in pressure results in a change in the piston travel.
Other mechanisms of the feeding device are driven by points of thrust, determined by a cam disk. At higher speeds the sensor starts to move away from the cam disk, this disturbs both the driving process and the synchronization.
SUMMARY OF THE INVENTION
In order to avoid these disadvantages, the invention makes use of hydraulic axial piston units for the drive of the translatory movement of the stopper and the pipe and a hydraulic rotary piston for the rotational movement of the cutting device.
The constant turning motion of the pipe can be achieved by means of a hydraulic rotary piston, which, if necessary, can be coupled with the hydraulic axial piston unit.
The hydraulic rotary piston is connected to the cutting elements of the cutting device via gears, excentrics or the like, in such a manner as to produce a shears-like motion of the cutting elements, so that premeasured gobs can be sectioned from the liquid glass strand.
All the hydraulic drives of the feeding device are actuated by switchvalves or the like, these being controlled by a computer and processor. The computer and processor is provided with a timer which controls in a simple manner, through coupling, all the further production elements requiring synchronization, such as the glass forming machine, cooling-oven pusher. In addition, the computer and processor is programmed to control the travel, time, speed, etc., in order to ensure an optimum control of the course of motion of the hydraulic drives. This way, a precise monitoring and control of the moving parts of the feeding device as well as of the other thereto connected machine elements is achieved according to the end position on one hand and to the intermediate position, on the other.
BRIEF DESCRIPTION OF THE DRAWING
The sole FIGURE of the drawing is a schematic view of a feeding device having a cutting device underneath according to the
REFERENCES:
patent: 1790987 (1931-02-01), Greer
patent: 1828443 (1931-10-01), Rankin
patent: 2077147 (1937-04-01), Honiss
patent: 2950571 (1960-08-01), Wythe
Hullen Helmut
Knoth Werner-Dieter
Kopatz Klaus
Dubno Herbert
Lindsay, Jr. Robert L.
Ross Karl F.
Veba-Glas AG
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