Fault Diagnosis of Mobile Drum Mixing Concrete Plant

• Posted by Mavis Chai October 10, 2024 Filed in Business #Mobile Concrete Batching Plant  27 views
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  Mobile drum concrete mixing plants may encounter various faults during use. The following is a summary of common faults and their diagnostic methods.

  Blender Malfunction
  The blender cannot start
  Phenomenon
  The mixer does not respond after pressing the start button.
  Diagnosis method
  Check whether the air compressor is started and whether the pressure of the gas supply system meets the design requirements (usually not less than 0.4MPa).
  Check if the circuit breaker is connected to ensure that the mixing machine has power supply.
  Check if the emergency stop button has been reset and if the access door is closed and blocked.

  The mixer may shut down or trip
  Phenomenon
  The mixer suddenly stops working or trips due to excessive current during operation.
  Diagnostic method
  Check if the ingredient system exceeds the limit and if there are any violations such as secondary feeding.
  Check whether the gap between the mixer blades and the lining plate is appropriate (usually within the range of 3-8mm), as a gap that is too large or too small may increase the mixing resistance.
  Check if the drive belt is tight, as a loosen belt can reduce transmission efficiency.

  The mixer does not mix evenly
  Phenomenon
  The concrete discharged from the mixer is unevenly dry and wet.
  Diagnostic method
  Check if the mixing time is sufficient, as a short mixing time may result in uneven mixing of the concrete.
  Check the installation sequence of the spray pipe nozzle and whether the spraying is uniform.
  Improper installation of the nozzle or uneven spraying can affect the humidity of the concrete.

  Conveyor System Malfunction
  Conveyor belt deviation
  Phenomenon
  The conveyor belt deviates from the predetermined path during operation.
  Diagnostic method
  Check if the frame foundation is flat, as uneven frames can cause the conveyor belt deviate. 
  Check if the flat roller is sticky, as sticky rollers can affect the running trajectory of the conveyor belt.
  Adjust the lead screw or counterweight of the tension on both sides of the conveyor belt tension on both sides of the conveyor belt.

  Conveyor belt breakage
  Phenomenon
  The conveyor belt suddenly breaks during operation.
  Diagnosis method
  Check if the conveyor belt is severely worn, as severely worn conveyor belts are prone to breakage.
  Check if the conveyor belt has been subjected to excessive tension or impact, such as excessive material accumulation or fast conveying speed.

  Unloading System Malfunction
  The discharge door cannot be closed or opened
  Phenomenon
  The discharge door cannot be closed or opened normally after unloading.
  Diagnostic method
  Check if the working pressure of the hydraulic device of the discharge door is normal.
  Check if the proximity switch and handle pointer of the discharge door are loose or damaged.
  Clean up foreign objects and accumulated materials between the discharge door and the sealing plate.
  Unloading door closed without signal
  Phenomenon
  After the discharge door is closed, there is no closing signal, resulting in the program being unable to continue running.
  Diagnostic method
  Check if the connection between the solenoid valve and the relay is loose or damaged.
  Check if the time relay is loose or damaged, causing the PLC to have no normal input signal.

  Other faults
  Sensor malfunction
  Phenomenon
  The sensor displays inaccurate values or cannot function properly.
  Diagnosis method
  Check if the sensor resistance value is within the normal range.
  Check if the sensor is affected by external interference or damage.
  Air compressor malfunction
  Phenomenon
  The air compressor cannot start or runs unstably.
  Diagnostic method
  Check if there are any internal faults in the air compressor, such as cylinder wear, piston jamming, etc.

  Maintenance and Upkeep Suggestions
  Regular cleaning
  Regularly clean the mixing tank, discharge port, mixing shaft, discharge door and other parts to prevent material residue form causing malfunctions.
  Lubrication and maintenance
  Regular cleaning
  Regularly clean the mixing tank, discharge port, mixing shaft, discharge door and other parts to prevent material residue from causing malfunctions.
  Lubrication and maintenance
  Regularly lubricate all lubrication points to ensure the normal operation of the equipment.
  Check for wear
  Inspect parts and components that are prone to wear, such as mixing arms, blades, scrapers, etc., and replace them promptly if they are severely worn.
  Electrical inspection
  Regularly inspect electrical contactors, relays, etc. to ensure that the static and dynamic contacts are intact.

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  In summary, the fault diagnosis of a mobile drum concrete mixing plant requires comprehensive consideration of multiple aspects,including the mixer, conveying system, unloading system, and other auxiliary systems. Through meticulous inspection and accurate diagnosis, faults can be detected and eliminated in a timely manner, ensuring the normal operation of equipment and extend its service life.