6.2. Vibration Generation

So, basically what to do here is, so this is a setup of the double acting steam hammer, you can see two cylinders one is the upper cylinder, other one is a lowest cylinder. Now in the upward stroke what you do is, you supply air into the lower cylinder. So, when you supply into this, this is a lowest cylinder, when you supply air into the lower cylinder, the hammer which was earlier in the lower cylinder will be pushed up into the upper cylinder. So, the hammer is pushed up into the upper cylinder, the air which was already there in the upper cylinder will expel out to the exhaust.

The double acting steam hammer consists of two cylinders: the upper and the lower cylinder. When air is supplied to the lower cylinder, the hammer is pushed upward into the upper cylinder. As it moves, the air that was in the upper cylinder is expelled through the exhaust. This process is crucial because it illustrates how the hammer is raised by applying pressure below it, using air to create motion.

Think of the double acting steam hammer like a toy balloon. When you blow air into the balloon, it expands. Similarly, in the hammer, when air pushes from below, it lifts the hammer up, just like how adding air lifts the balloon.

So, what are you doing the downward cylinder? You supply air through the inlet into the upper cylinder. So, when you are supply air into the upper cylinder, the hammer which was already there will be pushed into the lower cylinder. And air which was already in the lower cylinder will be expelled out through the exhaust.

In the downward stroke, air is supplied to the upper cylinder instead. This pushes the hammer down into the lower cylinder, where the air that was already present is expelled through the exhaust. This bidirectional operation allows the hammer to rise and fall alternately, effectively delivering its striking force.

Imagine a seesaw at a playground. When one side goes up, the other side must come down. Similarly, in the steam hammer, when the hammer moves up by pushing air underneath, it then comes down when the air pushes from above.

Another important thing we need to know with respect to double acting hammer is in this most of the blow energy is derived from the steam energy. Both for the upward stroke as well as for the downward stroke, the blow energy is derived mainly from the steam energy. So, 90% of the blow energy is derived from the action of air or the steam.

The double acting hammer primarily utilizes steam energy for its operation. Approximately 90% of the energy required to raise and lower the hammer comes from the steam, allowing for the design of lighter hammers instead of relying solely on weight. This efficiency in energy use means that lighter and smaller hammers can still achieve effective results.

Think about riding a bicycle. You can go faster with less effort if you use gears to make pedaling easier. Similarly, the steam energy serves as an efficient method for raising the hammer, allowing it to function effectively without needing to be extremely heavy.

This hammer is basically designed for I can say lighter conditions, lighter conditions in the sense. So, it is basically designed for light to medium weight piles and for soil with normal frictional resistance.

The double acting hammer is specifically designed to work in lighter conditions, meaning it is suitable for driving light to medium weight piles into soil types that have normal frictional resistance. However, it is not suitable for driving piles into very dense or high-friction soils, which require heavier equipment.

Using different types of hammers is like choosing the right tool for a job. Just as a light hammer is good for hanging a picture but not for breaking concrete, the double acting hammer is good for driving lighter piles but not suitable for tough soils.

These double acting hammers have a very high blow rate, if you look into the blow rate, you can see that the blow rate will be 95 to 300 blows per minute. So, it is very high when compared to the single acting hammer.

The double acting hammer operates at a significantly higher blow rate compared to single acting hammers, with rates between 95 to 300 blows per minute. This rapid operation allows for efficient pile driving but may also pose a risk of damaging concrete piles, which are less resilient to such forceful impacts.

Imagine tapping a nail into wood slowly versus hammering it quickly. Quick hammering might drive the nail in faster but can also split the wood. Similarly, high blow rates are efficient but must be managed to avoid damaging sensitive materials.

Let me summarize what we discussed, so your use of steam energy in driving the ram allows use of shorter stroke and compact hammer than single acting hammer.

The use of steam energy for both strokes allows double acting hammers to have a shorter stroke and a more compact design compared to single acting hammers. This means they are lighter and easier to handle, enhancing their suitability for diverse applications, particularly those involving lighter structures.

Think of how a compact car is easier to park and maneuver compared to a large truck. Similarly, the compact design of double acting hammers makes them more versatile and practical for many construction tasks.

--