There are requirements for the setting of the fulcrum position of the cast iron inspection platform

There are requirements for the setting of the pivot position of the cast iron inspection platform:

When installing the cast iron inspection plate, the position of the main support point needs to be determined first. Generally, the determination of the position is obtained by geometric principles, and a plane is not determined by three points on a straight line. Therefore, only by using three-point support can geometric stability be obtained. So the manufacturers of cast iron platforms all stipulate a three-point pivot form. The reason for this configuration is that cast iron plates are usually made under normal placement conditions, and the deflection caused by their own weight will not affect the accuracy of the plate. Therefore, the support points are set closer to the edge, which basically reduces the risk of cast iron plate overturning.

Cast iron inspection plate

Some cast iron inspection platforms use four point supports. During manufacturing (scraping or grinding) or use, this type of flat plate is inevitably supported on these three points at one time (these three points are harder to support), and then on another three points (the other three points are harder to support), causing the force points of the cast iron inspection platform to be in an uncertain state. However, the flat plate is not a rigid body, which can cause slight deformation of the working surface, resulting in unpredictable changes in the flatness value of the cast iron inspection platform and exceeding the tolerance. The large flat plates produced by general manufacturers are supported by six points. Due to insufficient rigidity and excessive positioning support of the flat plate, it is difficult to achieve geometric stability. During the production, inspection, and use of the flat plate, there may be changes in the position of the main support points due to bracket deformation or other reasons. All these supports keep the flat plate in an unstable deformation state, inevitably causing changes in the flatness value of the plate, making it difficult to maintain the stability of the accuracy of the plate.

In the use and processing of cast iron inspection platforms, main support points and auxiliary support points should be set up. What are main support points, auxiliary support points, and main support points? It refers to the part of the cast iron inspection platform used as the main support when in contact with the installation base or bracket during processing, inspection, and use. At this point, the supporting force system is in a static state. Auxiliary pivot point refers to the additional pivot point added to cast iron plates during use to prevent overturning or deformation caused by excessive load due to the displacement of the load-bearing center of gravity. The supporting force on the auxiliary fulcrum should be less than the supporting force on the main fulcrum.

The setting of the main and auxiliary supports of the cast iron inspection platform is an important factor affecting the accuracy and maintenance of the flat plate. To ensure consistency in the accuracy of the working surface during the processing, inspection, acceptance, and use of cast iron plates, a main pivot point is set up. This will overcome the problem of inconsistent flatness error values in the inspection and use of cast iron inspection platforms above 1000mm × 750mm. For large cast iron inspection platforms, tilting and overturning may occur due to excessive load. In order to increase the rigidity of the flat plate, prevent it from overturning due to center of gravity deviation, and prevent deformation caused by excessive load, auxiliary support points are set up to improve the accuracy of the use of cast iron flat plates.