Appearance Inspection of Laser Level Meter
Visual inspection
For a new factory spirit level, the working surface should be flat, smooth and free from defects such as blisters, pores, bruises, scratches, and rust. Stripped paint, rust and obvious defects are not allowed on non-working surfaces. The level should be clean and transparent, the engraved line should be clear and uniform, there should be no discoloration, and the engraved line should be perpendicular to the axis of the level. On the non-working surface of the spirit level, the name of the manufacturer, serial number and division value shall be marked.
Interaction of various parts
The main level should be installed firmly, and the zero adjustment device should be easy to use and reliable. The movement of the bubbles should be smooth, and there should be no visible jumping or stagnation. When the room temperature is 20°C, the length of the bubble should be equal to the distance between the two long scale lines, and the deviation should not exceed ±1 division for those with a division of 0.02~0.05mm/m; for those with a division of 0.06~0.10mm /m shall not exceed ±0.5 divisions. The stability of the movement of the bubbles and the length of the bubbles should be checked on a level tester.
Flatness of working surface
No protrusions are allowed on the working surface of the spirit level, and its flatness shall meet the requirements in Table 6-10-54. The length of the working face is 150~200 250~300, and the flatness deviation is <0.003 <0.005. For the grinding and grinding working face, the flatness is verified by the zero-level knife edge ruler whose size is not less than the length of the inspected face, and the light gap method is used for verification , this verification work should be carried out at several positions in the longitudinal, transverse and diagonal directions of the working face. The large gap seen is the flatness deviation of the surface. When estimating the size of the gap, it can be compared with the standard gap composed of gauge blocks.
For the flatness of the scraped working surface, use a zero-level flat plate to verify the coloring method. The number of spots in a square area with a side length of 25mm shall not be less than 25 points for a level with a division value of 0.02~0.05mm/m, and shall not be less than 20 for a level with a division value of 0.06~0.10mm/m Spots should be evenly distributed.
The straightness of the V-shaped working surface is verified by the method of painting with the verification mandrel. Put the mandrel coated with red lead powder on the V-shaped surface to rotate, and the contact line seen on the V-shaped surface is not allowed to have a discontinuity of more than 10mm.
