Packaging of cement
First, we need to understand the two packaging types of cement. They are bagged and bulk.
1. Cement in bags
The bagged cement is the kind of cement that is carried by porters one by one. The cement bag is a woven bag. It is also for cost considerations, because the cement industry is an industry with excess capacity, and the price of cement is low. Only by reducing costs can enterprises maintain meager profits, and the cost of each woven bag is very low. The bag has a poor seal, so a lot of dust seeps out. The bagged cement can be transported by ordinary trailer.
2. Bulk cement
Bulk cement comes out of the factory or transfer station without any packaging and is directly loaded into tankers for transportation. Bulk cement loading mainly includes silo bottom loading and silo side loading. Pneumatic) rotary unloading valve, blanking elbow, bulk machine loading or belt conveyor, dust collector, etc., can complete the loading task of the trailer. Bulk cement needs to be transported by cement bulker trailers.
Cement bulker trailer
Cement bulker trailer, alias cement tanker, powder cement tanker trailer. There are closed cargo compartments and automatic unloading devices, trailers for transporting bulk cement. Mainly used for cement factories, cement warehouses and large construction sites, which can save a lot of packaging materials and loading and unloading labor.
There are three types of Cement Bulker Trailer Gravity Dump Trailer, Mechanical Dump Trailer and Pneumatic Dump Trailer. The difference between these three trailers is mainly in the way of unloading and the equipment used.
Is it dangerous to transport with cement bulker trailers?
Bulk cement belongs to general cargo transportation, but the cement is alkaline in contact with water, and there is a certain pressure in the cement tanker. Under certain circumstances, the cement bulker trailer may explode. Cement bulker trailer transporters pay more attention to safety during transport. When the explosion occurs, the operator will be knocked up by the shock wave or injured by the cover, causing serious casualties; the explosion will also cause great harm to the surrounding environment and people. Cement bulker trailer transport company needs to understand the causes of accidents in order to take precautions.
Analysis of the cause of the cement bulker trailer accidents
1. Many manufacturers regard lightweight as the main criterion for measuring the performance of vehicle products. In order to achieve lightweight, some manufacturers use plates that do not meet the national standard thickness and strength to make cement bulker trailer, so as to reduce the weight of cement bulker trailer itself, but the compressive performance of the tank has not improved, and the compressive safety factor is on the contrary. Getting smaller and smaller. Some cement bulker trailer manufacturers did not conduct strength tests on the tanks of cement bulker trailer in accordance with relevant policy requirements when producing cement bulker trailer.
In addition, the tank body is scratched due to the use of tongs during transportation and production of the tank body; when grinding or cutting off the welding slag and welding flash on the tank body, if the tank body plate is worn or cut, the plate will become thinner. During the welding process of the tank body, the welding seam fails to meet the welding requirements, etc. These factors will affect the strength of the cement bulker trailer tank body, and the safety performance of the cement bulker trailer will be greatly reduced.
Therefore, cement bulker trailer transportation company must choose qualified products produced by qualified regular manufacturers when purchasing cement bulker trailer. The cement bulker trailer produced and wholesaled by Vehicle Master has complete qualifications, regular production and high quality. Customers from all over the world are welcome to order.
2. During the unloading process of the cement bulker trailer, it is necessary to apply pressure to the tank so that the material can be unloaded quickly, which leads to excessive pressure during the operation. The causes of excessive pressure in the tank can be roughly divided into three categories the unloading valve opens late in the pressurization stage before unloading, resulting in excessive pressure; the air supply at the initial stage of unloading is greater than the discharge of the tank, which is easy to cause excessive pressure. If the pipeline is blocked during the discharge process, it will also cause excessive pressure.
In order to ensure the safety of the cement bulker trailer during the unloading process, the cement bulker trailer manufacturer will configure the following safety devices pressure gauge, safety valve, air release valve, booster valve, etc. Each device on the car has at least one set. The functions of these devices are the pressure gauge can monitor the pressure in the tank; when the pressure in the pipeline and the tank exceeds the working pressure, the safety valve can automatically exhaust and reduce pressure; the air release valve is used for excessive pressure during the unloading process or after unloading. Artificial exhaust pressure reduction; booster valve can prevent pipeline blockage during unloading.
During the entire unloading process, the pressure gauge and safety valve play an important role in ensuring the safety of the pressure in the tank. Once the two fail at the same time, the vehicle cannot be automatically exhausted and depressurized, and it is very easy to cause an explosion due to excessive pressure in the tank.
3. During the unloading process of the cement bulker trailer, the excessive pressure in the tank caused the explosion of the tank, which was often related to the negligence or inexperience of the operators.
During the whole unloading process, the operator needs to monitor the pressure in the tank and the unloading situation at all times. If the pressure in the tank is found to exceed the specified pressure, in order to ensure the safety of the operation, pressure reduction measures should be taken immediately; if the air compressor or pipeline If the valve is abnormal, emergency measures should be taken immediately to stop the work; if the tank cover of the cement bulker trailer needs to be opened, it must be ensured that there is no pressure difference inside and outside the tank (that is, the pointer of the pressure gauge is 0) to operate. When the tank is under negative pressure, it will be difficult to open the cover due to the huge pressure; if it is opened rashly when the pressure is over (positive pressure), the accident that the operator may be ejected and killed may occur.
If the pressure gauge and safety valve fail at the same time during the operation, experienced operators can usually judge according to the vibration of the discharge pipe and the pumping time, etc., and take corresponding measures to complete the normal discharge.
Therefore, cement bulker trailer company should do relevant skills training for cement bulker trailer drivers and operators, and have enough understanding of the process to ensure the safety of unloading work.
In summary, the failure of production quality to meet the strength requirements of the tank, the failure of safety devices, and the negligence or lack of experience of operators are the main reasons for the explosion of the cement bulker trailer. In view of the causes of these accidents, each cement bulker trailer transportation company should take corresponding preventive measures to avoid the occurrence of accidents. Most importantly - source cement bulker trailers of absolute safe and reliable quality.