External armature type high precision positioning electromagnet

Abstract

The invention discloses an outer armature type high-precision locating electromagnet. The outer armature type high-precision locating electromagnet comprises a machine base, an armature, a coil, a locating shaft, a reset spring and an end cover. The machine base is of a cylinder structure with an open front end and a closed rear end. A magnetism-conducting shaft is arranged in the middle of the machine base, and the magnetism-conducting shaft and the machine base are coaxial. A through hole is formed in the axial direction of the magnetism-conducting shaft. Two shaft sleeves are fixed to the two ends of the through hole respectively. The locating shaft penetrates through the through hole of the magnetism-conducting shaft. The locating shaft is axially connected with the two shaft sleeves in a sliding fit mode. The armature is located in the machine base and is close to the open end. The outer circumferential surface of the armature is conical. The coil is located in a cavity defined by the machine base, the magnetism-conducting shaft and the armature. The reset spring is located between the magnetism-conducting shaft and the armature. The end cover is arranged on the armature in a sleeved mode and is fixedly connected with the machine base. The armature can freely move in the machine base in the axial direction of the locating shaft. By the adoption of the outer armature type high-precision locating electromagnet, automatic compensation for interval change caused by temperature variation can be achieved, and locating precision is high.

Description

technical field [0001] The invention relates to an electromagnet, in particular to an external armature type high-precision positioning electromagnet. Background technique [0002] An electromagnet is an industrial device that uses a energized coil to generate a magnetic field. The magnetic field magnetizes the iron core and the armature in it. The magnetized iron core and the armature attract each other to generate electromagnetic attraction, and finally push the armature to move. It is widely used in many mechanical equipment and electronic devices, such as electromagnetic relays, electromagnetic power-off brakes, electromagnetic chucks of cranes, locking electromagnets, etc., all of which belong to the category of electromagnets. [0003] In the prior art, the axial movement unit of the electromagnet for positioning mostly adopts the form of linear sliding bearing or ball linear bearing, both of which have the difficulty of ensuring the coaxiality of the front and rear en...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned deficiencies existing in the prior art, the purpose of the present invention is how to solve the problems of high assembly accuracy requirements of the existing electromagnets, large changes in positioning accuracy with temperature, poor repeatability, and easy jamming, and provide an external armature type high-precision electromagnet. The positioning electromagnet can automatically compensate the gap change caused by the temperature change, and has high positioning accuracy

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