27.01.2021
Longer lifespan due to clamped toggle pins

Stork IMM has improved their very reliable toggle system further by executing them with clamped toggle pins. Standard for the electrically driven clamping unit, optionally for the hydraulic execution in range from 2500 kN to 11000 kN.

What are toggle pins?
The toggle pins are the cylindrical pins in the toggle system of the machine that function as a pivoting point. To be able to rotate, minimal play is required between pin and bushing. Lubrication between pin and bushing creates a lubricating film to prevent wear.

What are “clamped” toggle pins?
In order to be able to mount the toggle pins, a certain amount of play between the pin and the fixed part of the hinge is required. In our former construction the pin was secured with a key. However, micro movements were possible due to the minimal play. Clamping the toggle pin instead of securing it with a key also secures the pin and furthermore reduces the play to zero.

This has a number of great advantages;

• The play in the toggle where the pin does not turn becomes zero. If the play is zero, then no wear can occur. The lifespan of the toggle lever system will extend considerably.
• Play will only occur in one place, namely, where the pin turns in the bushing. The play per pivot point is therefore halved. There are several pivot points in the toggle system, thus significantly reducing the total play. This allows for a more accurate positioning of the movable clamping plate when opening at high speeds, this is especially important with IML and the improvement ensures a more quiet movement.
• The clamping of the pins leads to a stiffer support of the pin, which in turn means that the bearing surface becomes larger, the surface pressure becomes lower and therefore the wear will become less.

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