The function of the linear guide motion is to support and guide the moving parts to make a reciprocating linear motion in a given direction. Depending on the nature of friction, linear motion guides can be divided into sliding friction guides, rolling friction guides, elastic friction guides, and fluid friction guides. Linear bearings are mainly used in automated machinery, such as machine tools imported from Germany, bending machines, laser welding machines, etc. Of course, linear bearings and linear shafts are matched. Like linear guides, they are mainly used in mechanical structures that require relatively high precision. There is no intermediate medium between the moving element and the fixed element of the linear guide, but rolling steel balls.
Friends who have used THK guides know that THK guides move in a straight line when they are running. Do we know the principle of its movement? And what are its components? I believe many friends have been curious. The answer is below, and the excitement continues!
For THK guide rail to realize linear motion, the following two basic conditions are required:
1. Drive parts
2. Guide parts
What is a drive component: The drive component provides the power required for the linear motion of the mechanism, and the guide component ensures that the mechanism moves in a certain direction and provides sufficient motion accuracy and support rigidity.
One. Drive components
The most basic linear motion drive components in engineering are:
1. Cylinder
2. Hydraulic cylinder
3. All kinds of motors (such as stepper motors, servo motors), these components are standard parts of commercial production, manufactured by specialized manufacturers, and can be obtained by sealing various typical linear motion cylinders directly through purchase.
Here is the simplest and lowest cost way to drive linear motion. To drive a mechanism to achieve linear motion, the simplest and lowest cost method is to use a linear motion cylinder, which is also the preferred method in engineering design.
The advantages of using a linear motion cylinder as a driving component are: simple installation structure, low cost, and fast manufacturing, precisely because it has these advantages. Therefore, linear motion cylinders are widely used in various automation equipment. Although in most cases the use of linear motion cylinders can meet the requirements of use. However, in a few cases, it will also be subject to the following restrictions:
Movement mode restrictions Ordinary linear motion cylinders can only perform a motion cycle between two points, which can meet the requirements in most cases. Even if a motion cycle between three points is required, two cylinders can be connected in series. In these cases, the speed of the cylinder is fixed once the adjustment is completed, and can only move at a fixed stroke and speed.
However, in some cases, it is necessary to realize the movement cycle between multiple points, which needs to be started and stopped frequently, and the movement direction and speed often need to be flexibly changed according to the actual situation. Such a movement mode cannot be completed with ordinary linear movement cylinders. Up.
4. Limitations of structural space
In some very compact structures, there may be insufficient space to install the cylinder, and the use of a motor may easily solve this problem. Because the motor can be installed in other places where space is allowed by belt drive or chain drive, the superiority of the motor is reflected in this occasion. Various drive motors widely used in automatic machinery.
Linear guides are mainly composed of sliders and guides, and the sliders are mainly used for sliding friction guides. Linear guides are also called linear guides, slides, linear guides, and linear slides. They are used for linear reciprocating motion applications, and can bear a certain torque, and can achieve high-precision linear motion under high load. In the mainland, it is called linear guide, and Taiwan is generally called linear guide, linear slide.