There are two common circulation development trend methods: external circulation and internal circulation. In the whole process of ball circulation application, sometimes I can get rid of the students' touch with the ball screw, which is called external circulation; It is called internal circulation to maintain social development in the work of ball screws from beginning to end. The ball is called the column as every cable digital television system software used in China's cycle, and the number of graduation circle diameters contained in each design scheme is called the number of turns. There are two, three, four, five rows of nuts for each activity of the internal circulation and its ball screw pair, and each row has only one such turn; There are 1.5, 2.5 and 3.5 cycles in each column of external circulation.

1)外循环：外循环是滚珠在循环全过程完毕后根据螺母外表层的螺旋式槽或置管回到滚珠丝杠螺母间再次进到循环，外循环滚珠滚珠丝杠螺母副按滚珠循环时的回到方法具体有轴承端盖式、置管式和螺旋式槽体式。常见外循环方法轴承端盖式；置管式；螺旋式槽体式。轴承端盖式，在螺母上生产加工一竖向孔，做为滚珠的往返通道，螺母两边的后盖板上开了滚珠的往返口，滚珠从而进到往返管，产生循环。置管式，它用弯头做为回到管路，这类构造工艺性能好，可是因为管路突显螺母身体之外，切向规格比较大。螺旋式槽体式，它是在螺母内孔上铣出螺旋式槽，槽的两边钻出来埋孔并与外螺纹滚道相切，产生回到通道，这类构造比置管式构造切向规格小，但生产制造较繁杂。外循环滚珠滚珠丝杠外循环构造和生产技术简易，应用普遍。其缺陷是滚道接口处难以做得光滑，危害滚珠燕尾导轨的稳定性。

1) External circulation: after the whole circulation process, the ball returns to the ball screw nut again according to the spiral groove or pipe placed on the outer surface of the nut. The external circulation ball screw nut pair returns to the ball screw nut according to the return method when the ball circulates, specifically including bearing end cover type, pipe placed type and spiral groove type. Common external circulation methods: bearing end cover type; Tube type; Spiral groove type. Bearing end cap type, a vertical hole is produced and processed on the nut as the round-trip safety channel of the ball. The back cover plates on both sides of the nut are opened with round-trip ports of the ball, so that the ball enters the round-trip pipe and generates circulation. In the pipe type, the elbow is used as the return pipe. This kind of structure has good process performance, but because the pipe protrudes outside the nut body, the tangential specification is relatively large. Spiral groove type, which is a spiral groove milled on the inner hole of the nut. The embedded holes are drilled on both sides of the groove and tangent to the external thread raceway, resulting in a return to the safety channel. This kind of structure is smaller than the tangential specification of the tubular structure, but the production is more complicated. External circulation ball screw external circulation structure and production technology are simple and widely used. Its defect is that the raceway interface is difficult to be smooth, which endangers the stability of the ball dovetail guide.

2）内循环：内循环均选用反向器完成滚珠循环，反向器有三种种类。圆柱体凸键反向器，它的圆柱体一部分置入螺母内，顶端开了反向槽2。反向槽靠圆柱体外圆面以及上端圆键1定位，以确保指向外螺纹滚道方位。扁圆形镶块反向器，反向器为一般圆口轴孔镶块，镶块置入螺母的切槽中，其端部开了反向槽

2) Internal circulation: the internal circulation adopts the reverser to complete the ball circulation, and there are three types of reversers. Cylinder convex key reverser, part of its cylinder is placed in the nut, and the top is opened with reverse groove 2. The reverse groove is positioned by the cylindrical outer surface and the upper round key 1 to ensure that it points to the direction of the external thread raceway. Oblate insert reverser, which is a general round mouth shaft hole insert. The insert is placed in the cutting groove of the nut, and its end is opened with a reverse groove

3，用镶块的外轮廊定位。二种反向器较为，后者规格较小，进而减少了螺母的切向规格及减少了径向规格。但这类反向器的外轮廊和螺母上的切槽规格精密度需求较高。

3. Use the outer wheel Gallery of the insert for positioning. The two reversers are relatively small, and the latter has a smaller specification, thereby reducing the tangential specification and radial specification of the nut. However, the outer contour of this kind of reverser and the slotting specification precision on the nut need to be high.

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