Measures taken to reduce the amplitude of oscillations can be ite in two ways: the first path will consist in the corresponding increase in the weight of the foundation, the second path is in balancing the machine itself, t. e. In the use of a tayugo mechanical device that would drive the cargo towards the piston (by analogy with the boat, one should plant the second boatman and make it go to meet the first).
For more accurate calculations to determine the movement of foundations, we will use the example of the reinforced concrete foundation of the blower machine, carried out at one of the Yugostal factories.
On the assignment, it was required to believe the foundation for a horizontal blower machine with a crooked-shaped mechanism.
Car power 3860 liters. C, productivity V = 1800 mm, the weight of the machine p = 730 t.
To determine the dynamic forces developed by the machine, it is necessary to know the weight of the moving parts and the nature of their movement.
From the above, it is known that the piston makes a reciprocating movement, while developing the force calculated by the formula:
The given example of the calculation, although it requires rather painstaking calculations, but allows you to find out with sufficient for practice the picture of the foundation movement and quite consciously relate to the resolution of frequent practical issues: what will happen if you put a new machine on the old foundation? The calculations made for both cases will show a change in the amplitudes of oscillations, and if these changes do not exceed 25% and the old car did not cause noticeable fluctuations, then the issue is resolved positively.
The basics of the design of the foundations are presented in the relevant departments of the reference book. It should be noted only the need to put the bolts in the nests in advance in the foundation so that they are by no means flooded with a cement mortar, but fall asleep with loose material, which allows a bolt to undergo elastic deformations and thereby fulfill its purpose.
Sinnatic supports are arranged in multi -cylinder machines for medium cylinders, and if the mechanics do not monitor them, then the protruding parts of the foundation that support these supports occurs.
There is nothing to say that when erecting foundations for horizontal piston machines, it is unacceptable for a long time to suspend concrete. Working seams when renewing concreting must be cleaned and the surface of the concrete is bound.