Knee joint

The magnetic seat includes non-magnetic front and rear baffles, and two magnetic yokes are composed of a predetermined number of yoke plates with the same geometry and adjacent splicing.

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Medical materials

Joint castings

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The magnetic base includes non-magnetic front and rear panels. Two magnetic yoke groups are composed of a predetermined number of yoke plates with the same geometric shape, which are adjacently spliced together. The relative inner sides of the yoke plates near the upper and lower ends respectively have a notch, and the edges of each notch have a flange. The yoke plates are perpendicular to the rotating axis of the rectangular magnetic element. Each of the two magnetic groups has an inner circular arc side, and the bottom end has a downwardly projecting contact part. The upper and lower non-magnetic blocks respectively have an inner circular arc surface, which together with the inner circular arc sides of the two magnetic yoke groups form a cylindrical inner cavity to encapsulate the rectangular magnetic element. The two sides of the upper and lower non-magnetic blocks have recesses that can prevent the flanges of the multiple yoke plates from sliding outward laterally. The recesses are closely fitted with the flanges of the multiple yoke plates. Each yoke plate has a number of through positioning holes. The positioning holes at the same position on each yoke plate are interconnected, and pins are inserted through the interconnected positioning holes of each yoke plate to connect and fix each yoke plate.

Inside the magnetic base is a cylinder, in the middle of which is placed a bar-shaped permanent magnet or a permanent magnet. The base position on the outside is a piece of soft magnetic material (soft magnetic material refers to a ferrite material that is easily magnetized and demagnetized under a weak magnetic field). By turning the handle, the magnet inside is rotated. When the two poles (N or S) of the magnet are in the up and down direction, that is, when the N or S pole of the magnet is facing the soft magnetic material base, it is magnetized, and this direction has a strong magnetic field, so it can be used to attract the steel surface. When the two poles of the magnet are in the horizontal direction, and the middle of NS is facing the soft magnetic material base (the middle of the bar-shaped magnet has only a very small magnetic field, which can be ignored), it will not be magnetized, so there is almost no magnetic force on the base at this time, and it can be easily removed from the steel surface.

This magnetic base utilizes two characteristics:

1. The fast magnetization and demagnetization characteristics of soft magnetic materials;

2. The characteristic that the magnetic field in the middle of a bar-shaped permanent magnet or permanent magnet is extremely weak, while the magnetic field at both ends is extremely strong.

The working principle of the magnetic base can be summarized in a few simple words: switching on and off the internal magnetic poles.

The magnetic base shell consists of two pieces of conductive magnetic material, separated in the middle by a non-conductive copper plate. There is a rotatable magnet inside, and this magnet has n and s poles along the diameter direction. When the magnet is rotated to the middle position, and the magnetic lines of force form a closed loop in the two conductive magnetic materials respectively, the base can be easily removed; after rotating 90 degrees, the n and s poles are facing the two conductive magnetic materials respectively. At this time, from the n pole to the conductive magnetic material to the guide rail to the other conductive magnetic material to the s pole, a magnetic line of force is formed, which can firmly adhere to the guide rail. The working principle of the magnetic base is actually very simple. The magnetic base is one of the most widely used and indispensable testing tools in the machinery manufacturing industry.

Name	Dimensions (mm)	Grade	Standard
Titanium Castings	Custom-made according to drawings Processing according to drawings	TA1, TA2, TA3, TA4, TA9, TA10, TA11, TA15, TC4, TC10, TiMo32, TC21, Ti60	GB/T6614-94, GJB/2896-97 ASTM B367
Zirconium Castings	Custom-made according to drawings Processing according to drawings	Zr702, Zr705	GB/T 8769-2019 STM B493