Magnetic adjustable cam

Abstract

A magnetically adjustable cam, which includes a cam piece, is characterized in that the fixed hole in the center of the fixed piece is a square hole, and a magnetic block installation hole is opened on the round surface, and a permanent magnet block is installed in the magnetic block installation hole. Both sides are equipped with a magnetic guide piece and a cam piece. The magnetic guide piece made of magnetic material has a fixing hole. Form a closed magnetic conduction circuit with the permanent magnet block in the cavity of the cam plate. The invention has the advantages of convenient adjustment, only the cam piece is adjusted during work, easy and convenient control and adjustment, saving time and labor, significantly reducing labor intensity and improving work efficiency. The adjustment accuracy is high, the positioning is stable and accurate, the cam piece can be adjusted at any angle, the permanent magnet has strong magnetic attraction, and the magnetic retention time is long, so that the position of the cam piece will not move. The fixed piece adopts the non-circular hole to be directly installed on the non-circular camshaft, which prevents the cam and the camshaft from producing circumferential rotation.

Description

technical field [0001] The invention relates to an assembly of low-voltage control electrical equipment, in particular to a magnetically adjustable cam used in a master controller. Background technique [0002] Traditional master controllers are used in electric drives for multi-line control. It controls the on-off and on-off time of the electrical circuit by adjusting the angle of the concave-convex working surface of the cam. There are basically three types of cams for traditional master controllers at home and abroad, and their structural forms and shortcomings are: [0003] 1. The cam is composed of a base wheel disc and a protrusion, and the protrusion is fastened to the connecting hole on the circumference of the base wheel disc by screws and nuts. Its large-scale adjustment and micro-adjustment are not ideal, and the precision is not high. After a long time of use, the bump is easy to move; the adjustment is inconvenient, there are many control loops, and repeated d...

AI Technical Summary

Problems solved by technology

Its large-scale adjustment and micro-adjustment are not ideal, and the precision is not high. After a long time of use, the bump is easy to move; the adjustment is inconvenient, and there are many control loops. Repeated debugging causes a large workload, time-consuming and laborious, and seriously affects work efficiency. During solidification, due to the sliding friction between the bump and the base wheel, relative movement occurs, resulting in adjustment errors, which cannot meet the requirements of high control accuracy

[0004] 2. The cam structure adjusted by the end-tooth clutch method can only be adjusted to 2.5", and the control amount per degree of the circumference is relatively large during control, resulting in low overall control accuracy.

Can not meet the requirements of high control precision

[0005] 3. The cam plate adjustment structure is adopted, and nuts are used to fasten both sides of the camshaft. Although high-precision adjustment can be realized in theory, when the nut is tightened, the cams will move with each other, causing adjustment errors, and it is difficult to achieve high-precision control requirements.

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