| 摘要 |
Toggle lever drive consists of levers connected together by pins. One of these pins is constructed as a transmitter operating on the magnetoelastic principle and contains a cavity, in which a magnetic core equipped with one or more coils is housed. Pref. the magnetic core has arms or branches carrying one prim. coil and one or more sec. coils, esp. at right angles to one another. The bisector of the angle is virtually perpendicular to the direction of action of the force. Useful in mould closure mechanisms in plastics injection moulding, where it is important that a given closure force shall not be exceeded. The detector system operates on the principle of measuring, by magneto-elastic effect, the shear force in the pin and transmitting it electrically to a control device. This is considerably simpler than other systems in which the stress in a lever is estimated from a strain gauge. Virtually no additional equipment other than the specially constructed pin is reqd.
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