Besides-star wheel magnetic detector

Abstract

The invention provides a besides-star wheel magnetic detector. The besides-star wheel magnetic detector comprises a main machine body, wherein a linear guideway is arranged on the main machine body, a movable chuck coil device and a besides-star wheel workpiece bearing platform are both arranged on the linear guideway, the movable chuck coil device is arranged above the besides-star wheel workpiece bearing platform, a liquid collecting tank is arranged under the linear guideway, the lower part of a fixed chuck coil device having an inner spraying function is arranged in the liquid collecting tank, the fixed chuck coil device and the movable chuck coil device are coaxially arranged, an outer spraying head is arranged in the liquid collecting tank, the liquid collecting tank is connected with a magnetic suspension liquid tank, and an automatic charging and discharging mechanism is arranged on the side surface of the main machine body. According to the besides-star wheel magnetic detector, the disadvantages of the prior art are overcome, all besides-star wheels with various specifications can be sufficiently and uniformly magnetized under a condition that a tooling is not replaced, a workpiece can be automatically loaded and unloaded conveniently, and the besides-star wheel magnetic detector is safe and reliable, has low failure rate and can be inserted into an automatic production line of a factory.

Description

technical field [0001] The invention relates to a magnetic detector for outer planetary wheels, which is used for magnetic particle flaw detection of outer planetary wheels of automobile parts, and belongs to the technical field of magnetic detectors. Background technique [0002] The outer star wheel is the main part in the car drive shaft universal joint. If there are defects such as cracks caused by material quality and processing on the outer star wheel, the drive shaft may break during use, which can easily cause car crashes and fatal accidents. Therefore, it must be inspected for flaw detection during the manufacturing process of the outer planetary wheel. From the perspective of fracture mechanics, the risk of surface defects is much higher than that of internal defects of the same size, so the magnetic particle inspection equipment suitable for the detection of surface and near-surface defects of ferromagnetic materials is used by manufacturers as an important means...

AI Technical Summary

Problems solved by technology

[0005] 1. Horizontal magnetic detector: the small end of the outer star wheel and the top of the inner spherical surface of the outer star wheel are clamped by the chucks at both ends, and the circumferential magnetization is carried out by directly passing the alternating current to find the axis of the inner and outer surface of the outer star wheel. Directional defects: The closed-circuit yoke is composed of chucks, guide rails and outer star wheel workpieces, and longitudinal magnetization is carried out by passing direct current through the coils on the chucks at both ends to find radial defects on the inner and outer surfaces of the outer star wheel ;This kind of structure can fully magnetize the inner and outer surfaces of the outer star wheel workpiece, but it can only be loaded and unloaded manually, and the rhythm is slow, which cannot meet the requirements of mass production.

In addition, due to the longitudinal AC magnetization, affected by the AC skin effect, it is difficult for the magnetic field to be introduced into the inner spherical surface of the outer star wheel, so that the defects of the inner spherical surface cannot be clearly displayed

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