The function of the wire guide is to support and guide the moving parts to move back and forth in a straight line in a given direction. In order to apply the right type of linear guide rail to the right situation, it is necessary for design engineers to understand the advantages and capabilities of different guide rails, so as to make a reasonable choice.

由直線軸承和直線軸配合使用，從外觀上來看是圓柱形的，可裝配與圓形孔中。同時，直線軸承還可配合滑塊使用，實現平面安裝。圓形導軌的安裝和使用都較為方便，節省空間。

It is used together by linear bearing and linear shaft. From the appearance, it is cylindrical and can be assembled in a circular hole. At the same time, the linear bearing can also be used with the sliding block to realize plane installation. The circular guide rail is convenient to install and use and saves space.

由方形滑塊和方形導軌配合使用，從外觀來看是方形的。從摩擦、可承受載負荷考慮，方形導軌是導軌與滑塊面接觸式摩擦，摩擦力較大，負載均勻，需要經常上油潤滑。

The square slide block and the square guide rail are used together, which is square in appearance. Considering the friction and bearing load, the square guide rail is the contact friction between the guide rail and the sliding block surface. The friction is large and the load is uniform, so it needs to be lubricated frequently.

對于圓形導軌和方形導軌的選擇，主要是從載荷、準確度、剛度、光潔度等幾個因素來考慮。方形導軌的典型應用是對載荷能力、剛度和準確度要求較高的機床行業。但滿足以上條件之后，就很難滿足其他要求，如安裝要求高、前期成本高、維護成本高。而圓形導軌在這方面就體現其優勢當安裝到平面度欠光滑的表面上時，仍然能夠平穩運行。圓形導軌通常比方形導軌能夠更快速地安裝和更平穩的運行。綜上所述，如何選擇要根據實際需求，選擇合適的才是好方案。

For the selection of circular guide rail and square guide rail, the load, accuracy, stiffness, finish and other factors are mainly considered. The typical application of square guide rail is in the machine tool industry which requires high load capacity, stiffness and accuracy. However, after the above conditions are met, it is difficult to meet other requirements, such as high installation requirements, high initial cost and high maintenance cost. The circular guide rail has its advantages in this respect. When it is installed on a surface with less smooth flatness, it can still run smoothly. Circular guideways are usually faster to install and run more smoothly than square guideways. To sum up, how to choose the right solution should be based on the actual needs.

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