As early as the eighties of the last century, there were experts in the field of fire protection who predicted the development direction of the lifting class of fire trucks;

There will always be a platform that can carry various firefighting machinery, just like a Swiss Army knife to switch tools at will. Pen, fun, and www.biquge.info

There has never been a shortage of illusions about the technology of the future in the history of mankind, and it has to be said that there has been no shortage of insightful people at all in any era.

It's just that turning the vision into reality is a long and long road. It's one thing to come up with a concept, it's another thing to implement a specific application.

Li Fanyu would never have imagined that what he is doing now is inadvertently fulfilling the flag set by experts in the field decades ago.

After the concept and specific ideas of the general platform were set, Li Fanyu asked Liu Qing to lead the team to improve the details.

Xu Fufang's team has always been a vehicle ECU, and is now responsible for the research and development of precision operating systems for fire trucks.

One of the more difficult aspects of this project was the combination of the operating system with a high-flow and precise hydraulic press. However, in the research and development of the previous four generations of tank dragon spine transmission system, Zhengxin's R&D engineers have experience in the research and development of hydraulic systems.

These two points are combined, and the project of controlling the system does not need Li Fanyu to worry too much.

So after the R&D direction of the general platform was determined, he came to Wang Yu's side. Participated in the development of climbing ladders, lifting platforms and lifting jet arms.

These three things are actually nothing. But if you really think that there is no technical content, you are wrong. On the contrary, these three bodywork machinery are the most important things for heavy fire trucks.

The ladder is essentially a telescopic device, the lifting platform is a telescopic folding arm device, and the lifting arm is a telescopic frame folding arm with a water cannon.

However, Comrade Wei Zheng of the Tang Dynasty summed it up very well: those who start well are really multiplied, and those who end up are widowed.

What seems simple and easy to get started with is actually the hardest!

It is necessary to set up a climbing platform and a lifting arm with a hydraulic steering structure in the middle, not to mention, let's talk about this ladder.

What kind of structure is needed to guarantee maximum strength?

What design should be used to meet the needs of making the ladder have a larger length and a smaller footprint?

What kind of layout is needed to ensure that the ladder can overcome wind resistance and ensure a low swing amplitude when the height is tens of meters or even hundreds of meters?

What kind of telescopic method should be used to meet the rapid deployment of the ladder and reach the working height?

These are all problems that need to be overcome!

Are there any ready-made designs?

Yes!

Germany, Japan, the United States, Switzerland, Australia and other countries have relatively advanced fire ladders, all kinds of ladder structures and telescopic ways are a big handful. However, patents belong to others, and they cannot be used if they do not give people patent fees.

And even if it can be used, will Li Fanyu use it?

Of course not!

How can it reflect the R&D level and technical level of an enterprise?

Make a standard for the market!

What he wants is a standard that is unique to the faith.

Fortunately, he also has a big killer that all designers in this world don't have - design expertise. After reviewing a lot of information with the team, he decided to create a special ladder.

At present, the ladder structure that is widely used is a concave telescopic type. In other words, the ladder is designed from bottom to top in a way that is one ring after another, so that it can be quickly deployed. Except for the hydraulic rod set used above, the principle of this play is similar to that of a throwing stick.

The structure of the ring sleeve can also obtain a shape similar to that of a throwing stick after the ladder is unfolded, which is thick at the bottom and thin at the top. This form ensures that the volume and weight of the lower part of the ladder are higher than that of the upper one. It is beneficial for the ladder to maintain stability in the state of wind resistance.

It can be said that the concave ladder structure can not only ensure the volume of the ladder in the closed state, can be quickly expanded, but also obtain a more reasonable mechanical structure after unfolding. As the base material evolved from steel to high-strength aluminum, the ladder has evolved over the decades and has been designed to perfection.

With decades of technology accumulation in front of him, it is not easy for Li Fanyu to break the convention.

However, Li Fanyu found inspiration from a child's toy.

What toys?

Most of the children born around 90 have played with a telescopic toy gun. It is a gun handle with an airliner, and the front is a very simple, deformed structure formed by a combination of levers, with a small rubber fist in the front. Pull the trigger, and the closed transmission structure opens and closes into a diamond shape, and the fist suddenly hits out.

It was the telescopic transmission structure used in this toy gun that made Li Fanyu have a bold idea!

Although the concave telescopic ladder is the most reasonable ladder structure at present, because of the structural limitations, the expansion speed of this ladder is still not very fast. Using a variety of advanced hydraulics, it is only possible to add a small speed buff to this structure.

But more advanced and more complex hydraulic transmissions mean higher costs and more complex structures, i.e. lower reliability.

But if you use a simple lever group of telescopic guns, simplify the complex, and use more simple physical principles, what effect will it bring?

Simpler structure!

Lower manufacturing costs!

Faster telescopic closing!

Lower drag coefficient!

When Li Fanyu proposed this idea, the engineers were stunned.

This principle is feasible, but the difficulty of implementation is as high as the sky! Fire-fighting equipment is suitable for use in emergency situations, with a new unconventional structure, one is that there is no ready-made case to follow, which means that it takes a lot of research and development energy and resources. The second is the unconventional ladder structure, which has not been tested in fire accidents and is difficult to be accepted by people.

Regarding these doubts, Li Fanyu's attitude is very clear.

"Everything that is perfect is the result of innovation. ”

This sentence was said by the famous economist and philosopher Mill in the nineteenth century. But when it came out of Li Fanyu's mouth, there was quite a lot of persuasion.

Because in this time and space, it is because of the repeated breaking of the routine that we have been able to achieve our current achievements.

But the mouth cannon cannot solve all doubts, and never an ear can be completely convinced by the mouth. To prove that your point of view is correct, you can only speak with facts.

After proposing the idea, Li Fanyu spent a night designing a triangular telescopic ladder model with three lever groups combined. The appearance of the model looks strange, in the closed state, it is trapezoidal when viewed horizontally, and when viewed from the top down, it is a triangular section, and in the closed state, it is only two meters wide and one meter long.

Accustomed to the angular concave telescopic ladder, this game should be so ugly that it explodes.

But according to Li Fanyu's design drawings, the situation is different when the model is made and assembled together.

When unfolded, this thing can reach a height of ten meters!

The expansion ratio reaches 1:10!

And, when fully unfolded, the shape of this thing is simply mesmerizing. How to describe it?

The fully unfolded ladder model looks like a big beautiful leg in mesh stockings!

In the comparative test with the concave ladder model of the same height, the ladder model, which was called "beautiful legs" by Li Fanyu, comprehensively crushed the conventional concave ladder in terms of volume, telescopic speed, drag coefficient and mechanical strength!

The engineers were convinced.