Selection of foundation for offset press installation

5.3 Foundation

The main function of the foundation is to support the machine and not allow any deformation where it contacts the machine. If there is deformation, the entire working state of the machine will be affected. In severe cases, the accuracy of the machine will be destroyed, and the quality of the printed product cannot be guaranteed, so it is necessary to ensure that the foundation will never be deformed. The construction of the foundation must take into account the weight of the machine. The higher the weight of the machine, the higher the requirements on the foundation's load-bearing capacity. If the weight of the unit is W, the impact force generated during operation is F, the contact area of ​​the machine's supporting screw and the foundation is S, and the average pressure of the foundation surface is P, then:

P · S > W + F P > (W + F) / S

It can be seen from the above formula that the pressure P on the foundation is inversely proportional to the contact area S. The larger S is, that is, the larger the contact area is, the larger P is. The contact area S refers to the place where the support of the machine contacts the foundation, not the entire foundation. From the perspective of the foundation, the larger the contact area, the better, and the lower the requirements for the foundation. If a larger rigid material is added under the supporting screw, as shown in Figure 5.9, the contact surface between the machine and the foundation is enlarged, thereby reducing the unit pressure P that the foundation bears.

(Figure 5.9)

(Figure 5.10)

If the rigid material is too thin to play its due role, as shown in Figure 5.10, it is necessary to increase the strength of the rigid material against deformation. In addition to the characteristics of the material itself, the surface deformation can be resisted by increasing the thickness of the material, as shown in Figure 5.11. However, the greater the thickness of the pad, the higher the center of gravity of the machine and the worse the stability of the machine, so the thickness of the material cannot be increased blindly. The larger the area of ​​the pad, the lower the unit pressure of the foundation and the lower the requirements for the foundation. The size of the foundation is directly related to the supporting screws, and generally the supporting screws should be included. The foundation should be a whole. It is not possible to make a foundation just under the supporting screw, and there is no other non-contact place, as shown in Figure 12a.

(Figure 5.11)

(Figure 5.12a)

In doing so, one is that each foundation is not well coordinated; the other is that the contact pressure between each foundation and the ground is much greater than the contact pressure between the entire foundation and the ground, which is likely to cause greater stress in places Deformation. In fact, the foundation is equivalent to a rigid cushion with a large thickness. The larger the foundation, the lower the unit pressure between it and the ground below, as shown in Figure 5.12b.

(Figure 5.12b)

However, as the foundation increases, its cost also increases. From an economic point of view, the smaller the foundation, the better. The larger the volume of the foundation, the stronger its ability to maintain its own inertia, and the greater its ability to resist impact, thus keeping the machine in its original position.
The foundation is often eroded by oil, so oil-resistant materials must be used as the foundation. Some equipment is also equipped with a dedicated oil receiving pan on the foundation. One way is to prevent the oil from flowing to the entire ground, and the other is to prevent the oil from seeping into the foundation. The use of oil receiving pan is only suitable for machines with little oil leakage. If the machine has serious oil leakage, an oil connecting cylinder (made together when the foundation is made) should be installed somewhere around the foundation, so that the escaped oil can flow to In the oil tank, as shown in Figure 5.13.

(Figure 5.13)

In addition, pay attention to the level of the foundation surface. If the contact surface between the foundation and the machine support is uneven, it will cause difficulty in finding the level. So if there are irregularities under the support (wire support, steel head, etc.), it should be leveled before the machine is in place.

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