Firstly, the cement mixing tank is very large, and there are two kinds of cement tanks. One is pure reverse, such as reversing out of the parking space. The second is unloading. If unloading, extend out of the chute. The tail of the cement tank truck is inconvenient to install because of unloading and some protruding from the tail

车尾比较脏，而且没有很合理的位置安装。

The rear of the car is dirty, and there is no very reasonable installation position.

水泥搅拌车特别大，俗称“大田螺”。

The cement mixer truck is very large, commonly known as "big snail".

路上左右超车、转弯，工地中频繁倒车等都是存在隐患的，其实不光是搅拌车包括挂车、大翻斗车都有所谓的大车盲区，老司机很难靠后视镜把握范围，靠的是经验，随着科技的发展，有很多很有疑问：为什么不安装倒车影像呢？

There are hidden dangers in overtaking, turning around on the road and frequent reversing on the construction site. In fact, not only mixing vehicles, including trailers and large dumpers, have so-called big car blind spots. It is difficult for old drivers to grasp the scope by means of rear-view mirrors, but by experience. With the development of science and technology, there are many questions: why not install reversing images?

不过仔细想一下，这个想法确实可以，因为很多时候，搅拌车司机都在倒车，在搅拌站接料的时候要倒车、给泵车送料要倒车、碰到狭窄的道路，很多时候都需要直接把搅拌车倒进去，我见过人家修路的，由于施工地点不能倒车，所以要把搅拌车倒进去，而且倒车长度大概在2左右，所以，按照你的问题所说的，如果能够在搅拌车的尾部安装一个倒车影响，这样对于驾驶员来说，确实可以更加的清楚的知道车尾部的路况和各种障碍物。

However, if you think about it carefully, this idea is really OK, because many times, the mixer truck driver is reversing, reversing when receiving materials in the mixing plant, reversing when feeding materials to the pump truck, and directly reversing the mixer truck when encountering a narrow road. I have seen people who repair roads. Because the construction site can't reverse, they have to reverse the mixer truck, Moreover, the reversing length is about 2km. Therefore, according to your question, if a reversing influence can be installed at the rear of the mixer, the driver can really know the road conditions and various obstacles at the rear of the mixer more clearly.

但是，就是这样一个可以提高驾驶员驾驶系数的装置，为什么就没有安装呢？

However, why is such a device that can improve the driver's driving coefficient not installed?

是大车的用途，大车一般都是工程用车，拉的都是砂石料，用途比较粗放，倒车影像属于精密电子元件，安装以后不断的装卸砂石料会对倒车影像产生影像，可能用不了多久就会出现故障。

The first is the purpose of the cart. The cart is generally an engineering vehicle, pulling sand and gravel, which is widely used. The reversing image belongs to precision electronic components. After installation, continuous loading and unloading of sand and gravel will produce an image on the reversing image, which may fail in a short time.

由于水泥搅拌车的工作环境复杂，上下左右电线，水管，围墙等等障碍物，加之放料时溅起的水泥浆也会把摄像头覆盖，所以一般倒车全凭驾驶员经验！

Due to the complex working environment of the cement mixer, the obstacles such as up, down, left and right wires, water pipes, walls and so on, and the cement slurry splashed during discharging will also cover the camera, so generally reversing depends on the driver's experience!

水泥搅伴车，我自己曾经开过，每天在工地进进出出，而且很多都是倒车的时候比较多，确实存在隐患。

I have driven the cement mixer truck myself. I go in and out of the construction site every day, and many of them are reversing more, which does have hidden dangers.

不只是水泥搅拌车，还有大货车，挂车翻斗车这些倒车时都看不见后面，倒车时只能凭司机的感觉，就拿水泥搅拌说，后面安个倒车影像几天就会被水泥糊满的，现在的科学是发达了，但是倒车影像可有可无的，全凭老司机的多年经验和感觉。

Not only cement mixers, but also large trucks and trailer dumpers can't see the back when reversing. When reversing, you can only rely on the feeling of the driver. Take cement mixing as an example. Installing a reversing image in the back will be filled with cement in a few days. Now science is developed, but the reversing image is dispensable, which depends on the experience and feeling of the old driver for many years.