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Compression Testing Machine
The machine consists of a steel cross head and steel base with two solid pillars connecting the base and cross head firmly tightened by nuts. The hydraulic jack of 200Tons / 2000KN capacity is fixed to the base. The upper platen has got a self aligning action and is attached to a screw which passes through cross head and can be raised or lowered for initial clearence adjustment. The lower platen rests on the jack ram and is positioned with the help of centering pin. Loading is accomplished by the upward movement of the lower platen. A dust cover is provided on the jack to protect any dust from going into the cylinder. A set of two spacers with center locating pin is provided to test small specimens.
The upper and lower platen of the machine are hardened , ground and polished . Guidelines are marked on the lower platen to keep the specimen coaxial with the hydraulic jack.The motorised pumping unit which is housed in an elegant console of double plunger type and is driven by 3 phase 440 volts 50 Hz electric motor and provided with a push button starter. The pumping unit is a separate unit connected with high pressure copper tube to the jack.
The pumping unit is fitted with three 20cm.dia. .Pressure Gauge : 0-200T, 0-100T and 0-50T or 0-2000KN, 0-1000KN and 0-500KN.,placed at an angle on the pumping unit for easy readability. A maximum red pointer is provided to take the readings after failure of specimens. Electrical pumping unit is fitted with three micro switches for each pressure gauge, which switch off the motor automatically as the load on the machine approaches 50 Tons/ 500KN, 100 Tons / 1000KN and 200 Tons/2000KN respectively in case the isolating valves are not operated. Relays are also incorporated in the pumping unit so that in case of breakdown of power supply the motor will stop and the same will operate only if the starting switch is run.The machine is provided with a hand wheel to vary the rate of application and a hand pumping arrangement in case of power failure. The machine satisfies the essential requirement of IS 516 .
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