1. Daily Maintenance and Fault Diagnosis of Concrete Mixing Station

1.1 Daily Maintenance and Fault Diagnosis of Mixing Main Building

The most important component of concrete mixing station is mixing main building. Therefore, in order to maintain the mixing station, it is necessary to maintain the main mixing building, that is, the main mixing machine, powder weighing, admixture weighing, water weighing, sand and gravel buffer hopper and inclined motor.

(1) The main mixer is a very important equipment in the main mixing building. Therefore, the lining board of the main mixer should be inspected frequently, and the lining board should be renewed immediately if it is found that the lining board is worn out by concrete, so as to avoid more serious problems because of the wear problem of the lining board. In addition, it should be noted that the centralized lubrication system of the mixer needs to ensure the continuous supply of lubricating oil, and the gear oil of the reducer of the mixer should be replaced regularly according to the requirements of the operating instructions. In addition, attention should be paid to the distinction of the label of gear oil between winter and summer.

(2) The powder scale, water scale and admixture scale of the main mixing building are collectively called quadruplex. The most important thing to pay attention to the daily maintenance of quadruple weights is to ensure that each weighing has its own dynamic inspection, and also to ensure that the sensors should be dry and that the connecting posts between weighing weights should be firm. Only in this way can we ensure the metering accuracy of the mixing station meter. In addition, pay attention to the mixing of the main building's bevel belt Click to regularly replace gear oil, while paying attention to the difference between winter and summer gear oil label.

(3) The most important part of concrete mixing station is the main mixing machine, and the tank part is the main working device of the main mixing machine. In normal work, the wear condition of tank body is the most serious. Usually, the lining plate, blade and the arm of the mixer shaft should be replaced regularly according to the wear condition in their work. At the same time, the clearance between the blade and the barrel wall of the mixer should be checked and adjusted in time according to the actual situation. After each concrete production, the tank body should be washed immediately. At the same time, the residual concrete should be inspected to adhere to the tank wall, mixing spindle and blade. This is the work that must be done after each concrete production. If it is found that there are concrete residues, it must be thoroughly cleaned, so as to avoid concrete solidification in the mixer and avoid failure in the next work. Workers should also ensure that there is no concrete residue on the baffle and that there will be no open failure of the discharge door. In addition, in order to avoid the entrance of mortar into the shaft end seal, it is necessary to pay special attention to the fact that if the mortar enters the shaft end seal, it will cause the failure that the main mixer can not start. In addition, in order to work safely during the daily maintenance of the mixer, the staff must disconnect the power supply before maintenance, press the emergency stop switch, and have special caregivers to avoid accidents.

Daily Maintenance and Fault Diagnosis of 1.2 Batching Machine

The proportioning machine of concrete mixing station is composed of sand hopper and flat belt. The daily maintenance and fault diagnosis of batching machine is the daily maintenance and fault diagnosis of gravel hopper and flat belt.

(1) First of all, the driver should hold a license to work. When loading loader, the driver should avoid shaking or over-filling during loading. In addition, it is forbidden to destroy the silo during loading. Drivers should regularly check whether the opening flexibility of the discharge door is qualified, and check the air pressure of the cylinder to ensure that there are no faults during the whole operation. (2) Another routine maintenance of batching machine is the routine maintenance of flat belt. In daily maintenance, attention should be paid to the replacement of gear oil of reducer regularly. In addition, attention should be paid to the distinction between the label of gear oil in winter and summer. In addition to these, in daily maintenance, the flat belt screw should be adjusted to avoid the phenomenon of belt deviation. In addition, it is necessary to check whether the roller and track are deformed or not. Once the deformation is found, it should be corrected immediately. Besides, the lubrication of the roller should be checked to avoid the damage of the roller assembly due to excessive friction resistance. At the same time, wheels with excessive wear and bearing ablation should be replaced in time to avoid derailment.

Daily Maintenance and Fault Diagnosis of 1.3 Spiral Conveyor

(1) The gear oil of the reducer should be replaced regularly, and the label of the two poles of gear oil in winter and summer should also be paid attention to. At the same time, the concentricity of each screw should be ensured, and the spacing between the blade and the wall of the screw barrel should be suitable for feeding, so as to ensure that feeding does not occur. Finally, we should pay attention to the good lubrication between the helixes.

(2) If blockage or slow cutting occurs, it is necessary to cut off the power supply and immediately check what problems occur at the discharge port. If the phenomenon of powder agglomeration occurs, measures should be taken to deal with it immediately and troubleshooting should be done immediately.

Daily Maintenance and Fault Diagnosis of 1.4 Skewed Belt

(1) Adjust the screw of the inclined belt in time to avoid the deviation of the inclined belt. Rollers and tracks should be checked regularly, corrected in time after deformation is found, lubricated wheels should be checked regularly to avoid the damage of roller components, excessive wear and abrasion of bearings should be replaced in time to avoid derailment.

(2) The bevel belt motor should change the gear oil of reducer in time and pay attention to the difference between the label of gear oil in winter and summer.

2. Case study on failure of concrete mixing station

2.1 Fault Case Handling

HZS50B mixing station in a construction site has 1000L discharge capacity of main machine, but the mixing concrete is overloaded. After technical inspection, the main motor of the mixing station has no performance problems and transmission organization has not found fault, but there are too large gap between the main engine blade and liner, serious wear and tear of liner, blade and mixing arm, slight slurry leakage at the double horizontal axle end of the mixer, and blockage of the butter pipeline at the axle end. According to the analysis, the problem of the mixing station is that the discharge capacity decreases. This is because the mechanical maintenance of the mixing station is not in place everyday, which results in serious wear and tear of liner, blade and mixing arm, damage of floating seal and excessive rotational resistance of double horizontal axles. The solution is to replace the liner and blade and mixing arm immediately, reduce the gap between the blade and liner, and reduce the occurrence of stones sticking. At the same time, the shaft end seal should be replaced by a new one, the oil passage should be dredged, and the bearing should be replaced. The unloading door of mixing station is also one of the frequently occurring and easy-to-break parts. The disadvantage of unloading door switch is that it should focus on checking whether the air pressure of the system is normal (greater than 4 atmospheric pressures); whether the cylinder solenoid valve is damaged; whether the cylinder of the material gate leaks, whether the stroke of the cylinder exceeds the limit; whether the material gate is stuck; whether the bearing of the material gate is damaged, etc.

2.2 Fault Case Processing Case II

The unloading door of HZ50 mixing station in a construction site opened smoothly, but the unloading door could not be closed after unloading. It needs manual closing to close the unloading door. After inspection, the following problems were found: the unloading door was deformed, and the cylinder opened the door with a stroke exceeding the limit, which led to the change of the closing moment, so it would be related to the problem of not opening the door. The solution is to clean up the debris around the unloading door and modify the stroke of the cylinder. For the feeding rack and support, the contact groove between the feeding rack and the roller should be carefully smeared with lubricant, and regular inspection should be carried out, which can reduce the resistance of the roller when working. Once the deformation of the feeding rack and support is found, the work should be stopped immediately and relevant measures should be taken to prevent the occurrence of safety accidents.

3. conclusion

According to the above description, in order to ensure the safe production of construction site, improve the intact rate of Engineering equipment, ensure that there are fewer faults in the equipment and ensure the quality requirements related to the output of concrete composite, it is necessary to require the construction site workers and site managers to do a good job of daily maintenance of the mechanical equipment of the mixing station. And timely troubleshooting. Only in this way can production efficiency, cost reduction and economic efficiency be improved.