Container holder

The operating cylinder of the shear which is to separate the funnel level with the container top, has a double-acting piston and is mounted in a bracket attached to the container-holder, as may be seen in Fig. 38. The wide shearing blade of about 10 mm thickness is screwed to the piston rod which is forged down in the form of a spade, and is guided in its travel on the container in lateral gibs. 

The press is equipped with a top- and bottom hydraulic cylinder a and h being positively connected to each other by columns c. The doubleacting main pistons d and e move the crossheads / and g. The container h is stationary and mounted in the container-holder i which in turn is fixed to the columns c by nuts j. The top movable crosshead / carries the ram k. The die-block I with hohow ram m rests on the bottom crosshead. The hollow ram m moves into a filling chamber n being connected to the extrusion chamber p through a ball check valve. 

Container and container-holder are rigidly attached to the container support d by four bolts c. This support is aligned to the center of the press by four lateral setscrews (not shown in the sketch) and is provided with a U-shaped slot, open to the outside, through which the die slide e which carries the die, is passed. If the die is to be removed, first the four bolts on the container-holder are released, whereupon the die slide is pulled out of the support manually with the help of a rod and the die which has dropped off, is picked up with a hook. 

The container is symmetrical and may be used from either end. It is centered to the container support in an annular groove. The container is held in the holder by a bayonet lock. When dismounting the container, the crosshead is lowered until the stroke limiting collar / makes contact. Then the clamping bolts are screwed in tap-holes specially provided for this purpose in the container, and with the crosshead moving up the container is lifted out. The container-holder is provided with a resistance heating system to heat the relatively small container. Its outer jacket is well insulated to prevent thermal losses. 

With older rod and tube extrusion presses the container is in many cases set in the center of the counterplaten. This design has, however, proved unsuitable because of the high transmission of heat. The method presently used is a separate container-holder, either bolted to the counterplaten or used to shift the container. The container-holder is made of a steel casting and is insulated both on the inside and outside so as to prevent absorption and reflection of heat. It has furthermore proved to be very advantageous to support the container both in the horizontal and vertical plane on four ribs, as illustrated in Fig. 142, to allow for a free expansion due to heat changes. 

The container-holder, as per Fig. 142, is in two-part design. The higher expenditure incurred, which is even increased by the unfavorable transmission of the displacement forces, is made up for by the advantage of the container being changed more easily. With this design the container is lifted out through the top which must not be obstructed by a press column. 

Movable container-holders are provided with adjustable guide shoes to allow for exact alignment of the axes of container and press. The container-holder is further designed so as to permit of swiveling the container 360° as the liner wears more quickly on the die end than on the charging end. This of course calls for die centering- and sealing cones to be provided on either end of the liner. 

A substantial improvement was obtained by mounting gas- or oil burners in the container-holder. The heating cycle could thus be sped up and controlled, having on the other hand the disadvantage that the heating of the container was not very uniform and that the hot gases escaping from the slits of the bore of the holder, obstructed the operation of the press. 

In order to render the heating system more efficient, the heat source was no longer placed in the container-holder, but in the jacket proper. 

In order to minimize radiation losses in the container jackets, it is recommended to also install a resistance heating in the container-holder of heavy presses. 

In order to provide the necessary coupling fluid the grip of the probe holder contains a small tank with a mixture of glycerine and water. Thus the operator is able to provide some drops of the liquid to every blade to be inspected. 

Push one end of a length of 20 cm. of stout copper wire into a cork (this wUl serve as a holder) at the other end make two or three turns about a thin glass rod. Heat the coil in the outer mantle of a Bunsen dame until it ceases to impart any colour to the dame. Allow the wire to cool somewhat and, while still warm, dip the coil into a small portion of the substance to be tested and heat again in the non-luminous dame. If the compound contains a halogen element, a green or bluish-green dame will be observed (usually after the initial smoky dame has disappeared). Before using the wire for another compound, heat it until the material from the previous test has been destroyed and the dame is not coloured. 

One-Step Cameras and Processors. The eadiest one-step cameras used roU film and completed processing inside a dark chamber within the camera (9). The first instant color film, Polacolor, was provided in roU film format to fit these cameras. Flat-pack film cameras (Fig. 2), introduced in 1963, permitted the film to be drawn between processing rollers and out of the camera before processing was completed (10). Film holders for instant 10 X 13 cm (4x5 in.) film packets contain retractable rollers that permit the film to be loaded without mpturing the pod (11). For 20 x 25 cm (8 x 10 in.) films, the processing rollers are part of a tabletop processor. The exposed film, contained in a protective black envelope, and a positive sheet with pod attached are inserted into separate slots of a tray that leads into the processor. The film passes through the rollers into a covered compartment within which processing is completed. 

Gas Holders Gas is sometimes stored in expandable gas holders of either the hquid-seal or dry-seal type. The hquid-seal holder is a familiar sight. It has a cylindrical container, closed at the top, and varies its volume by moving it up and down in an annular water-filled seal tank. The seal tank may be staged in several lifts (as many as five). Seal tanks have been built in sizes up to 280,000 m (10 X lO fE). The dry-seal holder has a rigid top attached to the sidewalls by a flexible fabric diaphragm which permits it to move up and down. It does not involve the weight and foundation costs or the hquid-seal holder. Additional information on gas holders can be found in Gas Engineers Handbook, Industrial Press, New York, 1966. 

Although rod anodes screwed into the side walls of containers are preferred, plate anodes and basket anodes are mostly necessary on the base. They are particularly suitable for large containers without being built in. Plate anodes are supplied with a flat plastic holder to which the cable conductor is attached and... 

GoS-befacUter, m. gas container, gas holder, gasometer, gas tank, -bekleidung, /. gas-protection clothing, -beleuchtung, /. gas... 

The method based on a net melt-holder is used successfully for materials with relatively low melting points and is less promising for the investigation of fluoride melts containing tantalum and niobium. 

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