Apparatus for preparation of samples for spectrographic analysis

Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Molding pressure control means responsive to pressure at...

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Details

91362, 100 51, 251322, 425167, 425170, B29C 4300

Patent

active

053463811

ABSTRACT:
An apparatus for compressing a workpiece is disclosed. The apparatus has a die to receive the workpiece in powdered or other form. An abutment holds the workpiece in a fixed position against the application of force, while a hydraulic cylinder is positioned to exert force against the die in the direction toward the abutment. A pump feeds hydraulic fluid to the hydraulic cylinder, and a pressure control valve is coupled to the hydraulic cylinder to control the maximum pressure in the hydraulic cylinder. The pressure control valve has a sealing member, a seat which engages the sealing member with the sealing member closing the outlet, a spring which urges the sealing member towards the seat, closing the outlet, and a backing member putting the spring under compression by maintaining a distance between the backing member and the seat. A stepping motor is rigidly mounted with respect to the seat. The stepping motor has a shaft which may be advanced towards and away from the valve seat whereby the degree of compression on the spring may be adjusted.

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