How is the cement tanker working and unloading and the structural principle?

Oil tank truck

First, the cement tanker product overview:

The cement tanker belongs to the powder tanker, the whole name is the powder material transporter. The powder tanker is suitable for the bulk transportation of fly ash, cement, lime powder, ore powder, granular alkali and other granular materials with a diameter of not more than 0.1mm. The powder material transport vehicle is a special-purpose vehicle widely used in industry, agriculture, commerce, power plants, construction, etc.;

Second, the advantages of cement tankers:

Cement is not shipped in paper bags from the factory, transport and storage, and is directly shipped through cement tankers. Therefore, it has the following advantages:

1. Reduce labor consumption, increase labor productivity, and improve working conditions;

2. Save the cost of packaging and crushing raw materials and paper bags, and reduce transportation costs;

3. The cement loss is reduced, the loss rate is generally below 0.5%, and the bagging loss rate is greater than this ratio;

4. To ensure the quality of cement, bulk cement is not easy to get wet during transportation, and it rarely deteriorates after one year of storage;

5. Reduce environmental pollution;

Third, cement tanker product structure and working principle:

1. The cement tanker is composed of two parts: the automobile chassis and the powder bulk transportation special device;

2. The top loading part mainly includes the transmission system, the tank body, the pipeline system, the auxiliary device and the auxiliary beam;

3. Working principle: The power of the automobile engine is transmitted to the air compressor through the mobile device such as the power take-off device and the transmission shaft. The compressed air generated by the air compressor enters the tank body, and the liquefaction device liquefies the powder material, out of the tank. The pressure difference generated, the powder material is transported along the discharge line to the designated position along with the air;

4. Fluidization of the powder: When the gas enters the powder layer from the lower part of the vessel, if the gas flow rate exceeds a certain value (cement is 0.015m/s), the friction between the gas and the powder and the granular body With equal weight, the powders and granules are no longer supported by the fluidized bed, at which point they can move freely, from high to low, keeping the upper plane of the powder layer horizontal, liquid-like. If the side wall of the container is open at this time, the powder can also be ejected from the hole. This is called fluidization. The cement truck utilizes the fluidization characteristics of the powder to achieve unloading. The function of the fluidized cloth is that the compressed air forms a fine and uniform airflow into the powder layer to fluidize the powder;

Fourth, sub-assembly structure and working principle:

1. The main body of the tank, the cylinder, the manhole cover and the liquefaction device;

a. The head adopts the standard elliptical head. The main specifications are EH2300, EH2400, EH2500, EH2600, EH2700mm.

b. The head and the cylinder material are Q345, QST420, 610, etc.; c. The manhole cover adopts two structures, one is the inner button type inlet cover (the height of the whole vehicle is 100mm lower than the external pressure spring lifting structure after loading) , but the operation is poor, the operation is troublesome), an external three-jaw external pressure manhole cover (high height, good maneuverability, easy operation), the standard configuration is the inner button manhole cover.

c. The internal fluidization device is the core component of the powder tanker, and mainly has a canvas type liquefaction device (composed of a perforated plate, a side slide plate, and a lower support structure, and the perforated plate and the side slide plate are at an angle to the horizontal plane. In order to improve the liquefaction effect, the ridge plate is also smashed on the perforated plate for diverting the cement and increasing the gas flow rate. The liquefied cloth is pressed against the perforated plate by bolts, and a closed air chamber is formed under the fluidized cloth, and the gas of each compartment is The chambers are not connected, the front and rear compartments can be unloaded independently) and the venting belt liquefaction device;

Fifth, the transmission system:

It mainly consists of power take-off, drive shaft, air compressor (rated working pressure is 0.2Mpa, speed is 800-1100r/min), etc.; a magnetoelectric tachometer is installed outside the tank to monitor the speed of the air compressor. The engine throttle can be adjusted by adjusting the throttle controller to change the air compressor speed;

Sixth, the pipeline system:

After the gas is output from the air compressor, it enters each compartment through the check valve and ball valve. A safety valve is installed before and after the check valve to prevent the air pressure from being damaged when the pipeline is too high. The safety valve setting meter The deflation pressure is 0.2Mpa; the secondary assisting blowing pipeline is connected to the discharge pipeline, and plays an auxiliary blowing action when discharging the material. The ball valve, the rubber hose and the auxiliary blowing valve can prevent the powder from entering the pipeline; The external air supply is provided for the user not using the air compressor of the vehicle, but using the outside compressed air. Install a pressure relief valve on the top of the tank to release the residual pressure in the tank and deflate the air before the user opens the material cover and stops the discharge;

Seventh, unloading system:

The discharge pipeline mainly has a suction port, a butterfly valve (sealed by a rubber sealing ring, which can be replaced if damaged), a discharge steel pipe, a discharge pipe joint, a discharge hose (a wear-resistant steel wire discharge hose, a diameter of 102 mm), etc. Composition; a shock-resistant pressure gauge is installed on the tank to monitor the change of pressure in the tank to guide the discharge;

Eighth, residual value:

According to the requirements of QC/T560-1999 “Technical Conditions for Bulk Cement Trucks”: under the condition of vertical height of 15m, horizontal distance of 5m and working pressure of 0.2Mpa, the average unloading speed of cement trucks is not less than 1.2t/min. The residual rate is no more than three percent.