As a pressure vessel, the air pressure water tank can store 350 ~ 500kg of water and bear a pressure of about 0.8MPa according to the volume. Therefore, it needs to have specific compressive strength and impact resistance. At present, self loading mixer enterprises usually use 3 ~ 5mm thick steel plate, with a self weight of about 90kg, which can basically meet the use requirements. However, its inner wall is in alternating contact with water, air and other media, which is very easy to produce corrosion, resulting in air and water leakage of the air pressure water tank, resulting in shortened service life; At the same time, the rust in the container will also cause various hazards to the pipeline and valve, thus increasing the maintenance and repair cost. Therefore, the anti rust problem of pneumatic water tank of self loading mixer has always been a major problem perplexing technicians and users in various enterprises.

某行业杂志为此曾专门组织了一期由业内参与的专题讨论，各位见仁见智，提出了诸多自上料搅拌车气压水箱防锈方案，归纳起来主要有2种思路：一是改变水箱材料，如更换成不锈钢，玻璃钢，工程塑料，等等；二是进行内部防腐处理，如内部电镀，增加塑料内衬等。

For this purpose, an industry magazine specially organized a special discussion with the participation of industry experts. Experts have different opinions and put forward many anti rust schemes for pneumatic water tank of self loading mixer truck. There are mainly two ideas: first, change the water tank materials, such as replacing with stainless steel, FRP, engineering plastics, etc; Second, carry out internal anti-corrosion treatment, such as internal electroplating, adding plastic lining, etc.

然而，提出的方案因不能彻底实际的使用要求，并且成本增加过高，客户难以承受。本公司下面提出一个方案，试图这一问题，具体步骤如下：当其中一个封头和中节组焊（或点焊）后，对焊合件及另一封头内壁进行喷砂处理，以去除氧化皮及其他污渍，再进行组焊，并焊好水路管件；进行试压，如有漏水点，进行补焊，直试压合格；罐内所有杂质，灌进约1kg调和好的防锈漆，较好采用船用漆，用丝堵封死所有管口；用类似以下工装设备——滚动摇摆机，其原理是水箱轴向作180°晃动，同时径向作360°旋转。以达到漆膜均布；倒出多余的防锈漆，气温高时自然晾干，气温低时烘干效果更佳。

However, the proposed solution can not completely solve the actual use requirements, and the cost increase is too high, which is difficult for customers to bear. The company proposes a scheme to try to solve this problem. The specific steps are as follows: when one head and the middle section are assembled and welded (or spot welded), sandblast the inner wall of the weldment and the other head to remove oxide scale and other stains, then assemble and weld, and weld the waterway pipe fittings; Pressure test shall be carried out, and repair welding shall be carried out in case of water leakage until the pressure test is qualified; Remove all impurities in the tank, pour about 1kg of mixed antirust paint, preferably marine paint, and seal all pipe orifices with screw plugs; The rolling rocking machine, which is similar to the following tooling equipment, is used. Its principle is that the water tank shakes 180 ° axially and rotates 360 ° radially at the same time. To achieve uniform distribution of paint film; Pour out the excess antirust paint and dry it naturally when the temperature is high, and the drying effect is better when the temperature is low.

值得一提的是，如果有条件采用电泳工艺，其步骤为：组焊成品→试压→（补焊）→合格→电泳→滚漆。此方法的优点：一是在设备上只需少量的投资，成本不会增加多少，不过超过100元，就能达到防锈效果而且还可以适度降低钢板厚度，达到轻量化及降低成本的效果。

It is worth mentioning that if electrophoresis process is adopted, the steps are: assembly and welding of finished products → pressure test → (repair welding) → qualified → electrophoresis → paint rolling. Advantages of this method: first, only a small amount of investment is needed in the equipment, and the cost will not increase much. However, if it exceeds 100 yuan, the antirust effect can be achieved, and the thickness of steel plate can be moderately reduced to achieve the effect of lightweight and cost reduction.

二是对原来的结构不需进行任何变动。三是还可以对自上料搅拌车现在使用中的水箱进行翻新处理。该方案虽然还不能一劳永逸地水箱锈蚀问题，但对于延长水箱使用寿命，减缓锈蚀程度能起到事半功倍的效果；可在不太增大成本的同时，较有效地自上料搅拌车气压水箱生锈问题。

Second, the original structure does not need to be changed. Third, the water tank in use of the self loading mixer can also be renovated. Although the scheme can not solve the problem of water tank corrosion once and for all, it can achieve twice the result with half the effort in prolonging the service life of water tank and slowing down the degree of corrosion; The utility model can effectively solve the problem of rust in the pneumatic water tank of the self loading mixer without increasing the cost.