1. Mounting base surface of grating ruler linear displacement sensor
When mounting the grating ruler sensor, the sensor cannot be directly mounted on the rough machine tool, let alone the machine tool with primer paint. The grating ruler and the reading head are respectively installed on two parts of the machine tool that move relatively. Check the parallelism between the mounting surface of the main ruler of the machine tool workbench and the direction of the guide rail movement with a dial indicator.
the dial indicator is fixed on the lathe bed, and the workbench is moved, and the parallelism should be within .1mm/1mm. If this requirement cannot be met, a grating ruler base needs to be designed and processed.
The requirements of the pedestal are as follows:
(1) A pedestal equal to the length of the grating ruler should be added (it is best that the grating ruler is about 5mm longer than the pedestal).
(2) The base is processed by milling and grinding processes, and its plane parallelism is ensured to be within .1mm/1mm. In addition, a reading head base with the same height as the ruler base needs to be processed.
the total * * * error between the base of the reading head and the base of the ruler body shall not be greater than ±.2mm .. During installation, adjust the position of the reading head so that the parallelism between the reading head and the grating ruler is about .1mm, and the spacing between the reading head and the grating ruler is about 1 ~ 1.5 mm..
2. Installation of grating ruler linear displacement sensor main ruler
Screw the grating main ruler on the mounting surface of the workbench installed by the machine tool with M4 screws, but do not tighten it. Fix the dial indicator on the machine bed and move the workbench (the main ruler and the workbench move at the same time). Measure the parallelism between the main ruler plane and the moving direction of the machine tool guide rail with a dial indicator, adjust the position of the M4 screw of the main ruler, and tighten the M2 screw thoroughly when the parallelism of the main ruler is within .1mm/1mm.
When installing the grating ruler, we should pay attention to the following three points:
(1) When installing the ruler, if the grating is more than 1.5M, we can't just install two ends like a bridge, but we still need to support it in the whole ruler body.
(2) After installation with a base, it is best to use a clip to clamp the midpoint (or points) of the ruler body.
(3) When the clip cannot be installed, it is best to stick the grating ruler body with glass glue to fix the base ruler and the main ruler.
3. Installation of reading head of grating ruler linear displacement sensor
When installing the reading head, first ensure that the base surface of the reading head meets the installation requirements, and then install the reading head. The installation method is similar to that of the main ruler. Finally, the reading head is adjusted to ensure that the parallelism between the reading head and the grating main ruler is within .1mm, and the gap between the reading head and the main ruler is controlled within 1 ~ 1.5 mm.
4. Limit device of grating ruler linear displacement sensor
After all grating linear displacement sensors are installed, a limit device must be installed on the guide rail of the machine tool to prevent the reading head from colliding with both ends of the main ruler when the products processed by the machine tool move, thus damaging the grating ruler. In addition, when purchasing the grating linear displacement sensor, users should try to choose a grating ruler which is about 1mm beyond the machining size of the machine tool to leave a margin.
5. Inspection of grating ruler linear displacement sensor
After the grating linear displacement sensor is installed, you can turn on the digital display meter and move the workbench to observe whether the digital display meter counts normally.
select a reference position on the machine tool and move the working point back and forth to the selected position. The readings of the digital display meter should be the same (or return to zero). In addition, you can also use a dial indicator (or dial indicator) to make the dial indicator and digital indicator set to zero (or remember the initial data) at the same time, return to the initial position after going back and forth many times, and observe whether the data of digital indicator and dial indicator are consistent.
through the above work, the installation of grating ruler linear displacement sensor is completed. But for the general machine tool processing environment, there are many iron filings, cutting fluids and oil stains. Therefore, the sensor should be attached with a protective cover. The design of the protective cover is determined by enlarging the external section of the sensor and leaving a certain space size. The protective cover is usually sealed with rubber to make it waterproof and oil-proof.
Extended information:
Precautions for the use of grating ruler
1. The installation of grating ruler linear displacement sensor is flexible and can be installed in different parts of the machine tool. Generally, the main ruler is installed on the workbench (skateboard) of the machine tool, and the machine moves with the knife.
2. The reading head is fixed on the lathe bed, and it should be installed on the stationary parts relative to the machine tool as far as possible, and the reading head should be installed below the main ruler as far as possible. At this time, the output wire is easy to be fixed without moving, and the ruler should be installed on the parts (such as skateboards) that move relative to the machine tool.
3. Pay attention to the splashing direction of chips, cutting fluid and oil when choosing the installation method. If the reading head is installed upward due to the limitation of installation position, an auxiliary sealing device is added.
4. The plug socket of grating ruler sensor and digital display meter should be plugged and unplugged after the power is turned off.
5. Add a protective cover as far as possible, clean up the chips and oil spilled on the ruler in time, and strictly prevent any foreign matter from entering the sensor housing of the grating ruler.
6. Regularly check whether the mounting connecting screws are loose.
7. In order to prolong the service life of the dustproof sealing strip, a thin layer of silicone oil can be evenly coated on the sealing strip, and care should be taken not to splash on the scratched surface of the glass grating.
8. In order to ensure the reliability of the grating ruler sensor, the grating ruler surface and the indicating grating surface can be cleaned and wiped with ethanol mixed solution (5% each) at regular intervals to keep the glass grating ruler surface clean.
9. It is forbidden to violently shake and break the grating ruler sensor, so as not to damage the grating ruler. If the grating ruler breaks, the grating ruler sensor will be invalid.
1. Don't disassemble the grating ruler sensor by yourself, and don't arbitrarily change the relative distance between the main grating ruler and the auxiliary grating ruler, otherwise the accuracy of the grating ruler sensor may be damaged; On the other hand, it may also cause the relative friction between the main grating ruler and the auxiliary grating ruler, and damage the chromium layer will also damage the grating line, thus causing the grating ruler to be scrapped.
11, attention should be paid to prevent oil pollution and water pollution on the grating ruler surface, so as not to destroy the fringe distribution of the grating ruler line and cause measurement errors.
12. The grating ruler sensor should try to avoid working in an environment with severe corrosion, so as not to corrode the chromium layer of the grating and the surface of the grating ruler and damage the quality of the grating ruler.
References: Baidu Encyclopedia-Grating Ruler
References: Notes on the use of Sirui-Grating Ruler.