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)外循環：外循環是滾珠在循環全過程完畢后根據螺母外表層的螺旋式槽或置管回到滾珠絲杠螺母間再次進到循環，外循環滾珠滾珠絲杠螺母副按滾珠循環時的回到方法具體有軸承端蓋式、置管式和螺旋式槽體式。常見外循環方法軸承端蓋式；置管式；螺旋式槽體式。軸承端蓋式，在螺母上生產加工一豎向孔，做為滾珠的往返通道，螺母兩邊的后蓋板上開了滾珠的往返口，滾珠從而進到往返管，產生循環。置管式，它用彎頭做為回到管路，這類構造工藝性能好，可是因為管路突顯螺母身體之外，切向規格比較大。螺旋式槽體式，它是在螺母內孔上銑出螺旋式槽，槽的兩邊鉆出來埋孔并與外螺紋滾道相切，產生回到通道，這類構造比置管式構造切向規格小，但生產制造較繁雜。外循環滾珠滾珠絲杠外循環構造和生產技術簡易，應用普遍。其缺陷是滾道接口處難以做得光滑，危害滾珠燕尾導軌的穩定性。

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）內循環：內循環均選用反向器完成滾珠循環，反向器有三種種類。圓柱體凸鍵反向器，它的圓柱體一部分置入螺母內，頂端開了反向槽2。反向槽靠圓柱體外圓面以及上端圓鍵1定位，以確保指向外螺紋滾道方位。扁圓形鑲塊反向器，反向器為一般圓口軸孔鑲塊，鑲塊置入螺母的切槽中，其端部開了反向槽

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，用鑲塊的外輪廊定位。二種反向器較為，后者規格較小，進而減少了螺母的切向規格及減少了徑向規格。但這類反向器的外輪廊和螺母上的切槽規格精密度需求較高。

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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