Installation method of grating ruler line displacement sensor of image measuring instrument
The installation method of the linear displacement sensor of the grating ruler of the image measuring instrument. Grating ruler, also known as grating ruler displacement sensor, grating ruler sensor, is a measurement feedback device that uses the optical principle of grating. Grating rulers are usually used in the closed-loop servo system of CNC machine tools to detect linear or angular displacement. , The measurement output signal is a digital pulse, which has the characteristics of large detection range, high detection accuracy and fast response speed. For example, it is often used in CNC machine tools to detect the coordinates of the tool and the workpiece to observe and track the tool error, thereby playing a role in compensating for the tool movement error. The installation of the linear displacement sensor of the grating is more flexible and can be installed in different machine tools. Location. Generally, the main ruler is installed on the slide rail and the bed of the machine tool to move with the knife. The reading head is fixed on the bed, and the reading head is installed under the main ruler as much as possible. The choice of installation method must pay attention to the direction of chip splashing, cutting fluid and oil. If the reading head must be installed upwards due to the limitation of the installation position, an auxiliary sealing device must be added. In addition, under normal circumstances, the reading head should be installed as far as possible on the fixed part of the machine tool. At this time, the output line will not move and is easy to fix, so the ruler body should be installed on the moving parts of the machine tool, such as a sliding plate. 1. The installation foundation of linear grating ruler linear displacement sensor. When installing the grating ruler sensor, it cannot be directly installed on the roughing machine tool, nor can it be installed on the primer machine tool. The grating ruler and the reading head are respectively installed on the machine tool. On the two parts of relative movement, use a dial indicator to check the parallelism between the installation surface of the main scale of the machine tool and the moving direction of the guide rail, fix the dial indicator on the bed, and move the worktable to achieve parallelism within 0.1mm / 1000mm If you cannot meet this requirement, you need to design and process the grating scale base. A base equal to the length of the scale body should be added. The base is preferably about 50mm longer than the scale. 2. The base is processed through the milling and grinding process to ensure that the plane parallelism is within 0.1mm / 1000mm. In addition, the base of the reading head with the same height as the ruler base, the base of the reading head and the base of the ruler need to be processed The total error of the reading head should not exceed ±0.2mm. During the installation process, adjust the position of the reading head so that the parallelism between the reading head and the scale body is about 0.1mm, and the distance between the reading head and the scale body is about 1-1.5 mm.
3. To install the main scale of the linear displacement sensor of the grating ruler, use the M4 screws on the main surface of the machine tool table to install the grating main ruler, but do not tighten it. Fix the dial indicator on the image measuring instrument, and move the main ruler and the table at the same time, use the dial indicator to measure the parallelism between the main ruler plane and the direction of the machine tool rail, adjust the position of the main ruler M4 screw, and make the main rule parallel The degree is within 0.1mm / 1000mm.
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