さく岩機性能の電磁的測定について
1964 年 80 巻 914 号 p. 665-668
詳細
1964 年 80 巻 914 号 p. 665-668
Up to the present, the piston speed of the rock drill was obtained by drawing the tangent on the stroke curve, and the indicated energy was obtained from the area of the pressure-stroke diagram. These processes were very troublesome and easy to introduce errors.
Against these, we could measure the blow speed of the piston directly with the syncroscope which records an electro-magnetic motive power proportional to the piston speed, generated by making a coil attached to the piston traverse a uniform magnetic field.
If this motive power becomes an input to the wheatstone bridge of strain, gauges built in the internal pressure measuring pick-up of the cylinder, a mean value of an output is proportional to the indicated energy per unit time.
We could measure this value immediately with the galvanometer of the long period (8.6 spc).
