With the rapid economic growth, the development of guide rail has also made remarkable achievements. Linear guide rail is used in woodworking machinery, conveying machinery, electronic semiconductor equipment, robots, mechanical arms, etc., but sometimes many people don't know the difference between linear guide rail and linear slide rail, and confuse the two, although they are both parts of machinery, Bear a certain load and realize high-precision movement under high load. However, the linear guide rail and the linear slide rail are not the same before, and there are still different places.

直线导轨按照滚珠在导轨和滑块之间的接触牙型对直线导轨副进行分类，主要有歌德式牙型和圆弧式牙型。歌德式也称作两列式，圆弧式也称作四列式。由于圆弧式牙型其接触角在传动中易变动，产生间隙与侧向力变动，安装容易。而歌德式牙型其接触角能保持不变，刚性也比较稳定。一般而言直线导轨的常用结构以这两种类型为主。通常，直线导轨副的选用需要根据使用条件、负载能力和预期寿命选用。

The linear guide rail pair is classified according to the contact tooth pattern of the ball between the guide rail and the sliding block, mainly including Gothic tooth pattern and arc tooth pattern. Goethe type is also called two column type, and circular arc type is also called four column type. Due to the circular arc tooth, its contact angle is easy to change in transmission, resulting in the change of clearance and lateral force, which is easy to install. However, the contact angle and rigidity of the Gothic tooth form can remain unchanged. Generally speaking, the common structures of linear guide rail are mainly these two types. Generally, the selection of linear guide rail pair needs to be selected according to the service conditions, load capacity and expected life.

直线导轨又可以分为滑动导轨和滚动导轨。滑动导轨是导轨和滑块直接接触，较低，精度也低，摩擦系数大。滚动导轨是在导轨和滑块之间装有滚动体，滚动导轨，结构较复杂，也比较高点，摩擦系数小，精度高，它的作用主要用来支撑和引导运动部件，让它按照指定的方向做复线运动。由钢珠在滑块与导轨之间做无限的循环滚动，让一些负载的平台可以沿着导轨以高精度做线性运动，大大降低了摩擦系数，是比普通传统的的滑动导轨1/50。

Linear guide rail can be divided into sliding guide rail and rolling guide rail. The sliding guide rail is in direct contact with the sliding block, with low price, low precision and large friction coefficient. The rolling guide rail is equipped with a rolling element between the guide rail and the sliding block. The rolling guide rail has complex structure, high price, small friction coefficient and high precision. Its function is mainly to support and guide the moving parts and make them move in a double line according to the specified direction. The steel ball makes infinite circular rolling between the sliding block and the guide rail, so that some loaded platforms can move linearly with high precision along the guide rail, greatly reducing the friction coefficient, which is 1 / 50 higher than the ordinary traditional sliding guide rail.

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