In order to improve the transport efficiency of cement and reduce the waste of resources caused by bagged cement, most of the cement is transported by bulk cement tankers at present, because the cement tankers are transported and unloaded by pneumatic means, and the unloading speed and the residual rate of unloading are important indicators to assess the unloading efficiency of the cement tankers. It is very important to adopt correct methods to ensure that the cement in the tank is discharged as much as possible. Because the cement in the tank cannot be seen directly by the naked eye during the unloading process, some methods must be used to identify the unloading situation of cement. Here are some simple methods to determine whether the cement has been unloaded:

　　壓力表檢查法：散裝水泥罐車在卸料時(shí)，罐內(nèi)空氣壓力為1.8～2.4公斤/平方厘米，卸料快結(jié)束時(shí)，氣壓快速下降，如果壓力表降到0～0.2公斤/平方厘米之間，則證明罐內(nèi)水泥基本卸完。

　　Inspection method of pressure gauge: when unloading the bulk cement tanker, the air pressure in the tank is One point eight ~ Two point four Kg / cm2. At the end of unloading, the air pressure drops rapidly. If the pressure gauge drops to 0 ～ Zero point two Between kg / cm2, the cement in the tank is basically discharged.

　　卸料時(shí)間判別法：正常水泥罐卸料速度一般為每分種1～1.2噸，如果水泥裝載重量為32噸，則一般需要半小時(shí)左右卸完，所以可以根據(jù)卸料噸位計(jì)算卸料時(shí)間，這樣前25分鐘操作人員比較輕松，沒有必要長時(shí)間緊盯壓力表或通過其它方法檢查是否卸完。

　　Determination of unloading time: the unloading speed of normal cement tank is generally 1 ~ per minute One point two Tons, if the loading weight of cement is 32 tons, it usually takes about half an hour to unload, so the unloading time can be calculated according to the unloading tonnage, so that the operators in the first 25 minutes are relatively easy, there is no need to stare at the pressure gauge for a long time or check whether the unloading is completed by other methods.

　　空壓機(jī)聲音辨別法：正常卸料時(shí)空壓機(jī)負(fù)載大，空壓機(jī)工作時(shí)發(fā)出的聲音比較沉悶，罐體卸料結(jié)束時(shí)，空壓機(jī)負(fù)載變小，工作聲音變得清脆。

　　Air compressor sound identification method: the load of the air compressor is large in normal unloading time and space, and the sound produced by the air compressor during operation is relatively dull. When the unloading of the tank is completed, the load of the air compressor becomes smaller and the working sound becomes crisp.

　　敲打罐體法：水泥卸料過程中，可以用手敲打罐體，如果聲音沒有回音，則證明罐體內(nèi)水泥余料較多，還要卸一段時(shí)間;如果罐體有回音，證明罐體內(nèi)水泥快卸完了。

　　Knock tank method: in the process of cement unloading, you can knock the tank with your hands. If there is no echo in the sound, it is proved that there is more cement surplus in the tank, and it will be unloaded for a period of time; if there is echo in the tank, it is proved that the cement in the tank is almost discharged.

　　卸料軟管觀察法：正常卸料時(shí)，卸料軟管受流化水泥沖擊，軟管不斷抖動(dòng)，如果軟管不再抖動(dòng)，也可證明罐內(nèi)水泥基本卸完。

　　Observation method of unloading hose: during normal unloading, the unloading hose is impacted by fluidized cement, and the hose keeps shaking. If the hose does not shake, it can also prove that the cement in the tank is basically discharged.

　　水泥接收塔頂揚(yáng)灰辨別法：正常卸料時(shí)，水泥消耗的氣量相對(duì)較少，“料多氣少”，接收塔頂揚(yáng)灰較少，卸料后期“料少氣多”，接收塔頂揚(yáng)灰增多。

　　Identification method of lifting ash on the top of cement receiving Tower: during normal unloading, the gas consumption of cement is relatively less, "more material and less gas", less lifting ash on the top of receiving tower, and "less material and more gas" at the later stage of unloading, more lifting ash on the top of receiving tower.