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Common Faults and Treatment Methods of Concrete Mixing Plant

Thomas Huang posted this article in July 27, 2020

During the use of concrete mixing stations, due to aging, wear and environmental impact of components, 6 errors often occur. So how to deal with the failure of concrete mixing stations? How to solve common failures? Please see the introduction below.
1. Weighing of cement scale is not allowed
The fault manifests that the correct value can be displayed after the calibration with the weight, but the number does not return to zero after unloading. After the zero is loaded, the number of the weight changes greatly, but the sensor resistance value is within the normal range and the instrument has no problems.
The reasons for analysis may include: the angle iron of the fixed scale frame for transportation has not been removed; the card is issued at the pressure head and the pressure plate; the scale body interferes with the outside world; the three sensor models do not match; the load is unbalanced when weighing the material.
The method to deal with the failure of the concrete mixing station is: if the angle iron of the fixed scale frame for transportation is not removed, it should be removed in time; if the pressure head or pressure plate is issued, it should be processed in time to make it smooth and without resistance; if the scale body interferes with the outside world , Should be isolated in time; if the three sensor models do not match, the sensor of the same model should be replaced; if the material is biased, it should be adjusted.
2. Difficult opening and closing when the discharge door of the collecting chamber is empty
The failure manifests as slow and weak cylinder movement, but the mechanical part of the discharge door is inspected for friction and stagnation, and the solenoid valve and cylinder are not leaking.
The reasons for the analysis may be: the air path is not smooth, such as the filter element of the triple-part air-water separator at the air source is too dirty, resulting in a poor air path, which reduces the gas flow per unit time, resulting in slow cylinder movement; the muffler is too dirty, in When the cylinder moves, the pressure difference between the rod cavity and the rodless cavity becomes smaller, causing the cylinder to move slowly.
The method to deal with the failure of the concrete mixing station is: if the air path is not smooth, the filter element should be cleaned or replaced in time; if the muffler is too dirty, the muffler should be cleaned in time.
3. No discharge at the discharge port
The fault manifests as the contact opening and the motor rotating clockwise, the outlet of the screw conveyor of the mother and the child does not discharge, the air switch will trip after a long time; after the air switch is closed, the motor will still trip and observe the powder No solidification.
The reasons for the analysis may be: the mother machine is reversed; the air switch is damaged; the motor connection of the mother machine may have a bad contact.
The method to deal with the failure of the concrete mixing station is: if the mother machine is reversed, adjust any two of the motor connections of the mother machine; if the air switch is damaged, it should be replaced; if there is a bad contact in the motor connection of the mother machine, it should be checked and dealt with.
4. Stirring shaft "boring car"
The failure manifested in the fact that the mixing shaft is difficult to rotate when the mixing host is mixing the mortar, and even stops.
The reasons for the analysis may be: severe overload, material hoop shaft; secondary feeding caused by human error; inaccurate weighing; the gap between the stirring blade or side blade and the inner wall of the tank is large, and foreign matter enters and gets stuck between it; the voltage is too low; stirring parameters Wrong setting.
The method to deal with the failure of the concrete mixing plant is: if it is severely overloaded, the material hoop shaft, the mixing capacity should be adjusted, and the solidified mortar should be cleaned up in time; if the secondary feeding is caused by human error, the excess material should be cleared and operated according to the process flow; if the weighing is not The operator is required to re-scale the scale; if there is foreign matter stuck between the stirring blade or the side blade and the inner wall of the tank, the gap between the blade and the lining plate should be adjusted so that it is not more than 5 mm, and the foreign body should be cleaned in time; if the voltage is too low, Check the line voltage again; if the parameter setting is wrong, the corresponding batching data should be carefully checked and corrected in time.
5. Unloading door of host cannot be opened
The fault manifests as the discharge door of the host machine cannot be opened when the mixing station is working automatically, and the discharge indicator light does not turn on when the mixing is completed.
The reasons for the analysis may be: there are foreign objects or accumulated materials between the discharge door and the sealing plate; the pressure of the gas circuit system is insufficient, the cylinder leaks or the oil mist device is damaged; the wiring between the solenoid valve and the relay is disconnected, the virtual connection is damaged, or the relay is damaged; The solenoid coil is burnt or the spool is stuck; the time relay is damaged, causing the PLC to have no normal input signal.
The method to deal with the failure of the concrete mixing plant is: if there is foreign matter or accumulation between the discharge door and the sealing plate, the foreign matter and accumulation should be cleaned and the discharge door should be washed; if the pressure of the gas system is insufficient, the cylinder leaks or the oil mister is damaged , You should check whether the lubricator, connector, cylinder and other parts are damaged; if the wiring between the solenoid valve and the relay falls off, the virtual connection or the relay is damaged, you should check the relay contact output and wiring, and replace it if necessary; if the solenoid valve coil burns The solenoid valve should be replaced if it is damaged or the spool is stuck; if the time relay is damaged, it should be replaced.
6. Conveyor belt deviation
The fault is manifested in three situations: one is that the conveyor belt deflects to the same side under no-load and loading conditions, that is, the conveyor belt center line deflects laterally, and the conveyor belt is biased to the side with less material; the second is the conveyor belt left, The right is deviated without a fixed direction; the third is that the conveyor belt deviates in the middle of the entire conveyor conveyor.
Uneven foundation, sticky material of flat idler roller, left-right imbalance of grooved roller, and unbalanced part of active and passive roller adjustment will cause deviation of conveyor belt. If the conveyor belt deflects to the same side under both no-load and loading conditions, it means that the tension on both sides of the conveyor belt is not the same or the rack is uneven. At this time, you should first level the base of the frame, remove the sticky material from the flat idler, and adjust the screw or counterweight of the tensioning mechanism. If the conveyor belt has no fixed direction to the left and right, it means that the conveyor belt is slack and the tensioning mechanism should be adjusted. If the conveyor belt deviates in the middle of the conveyor, it can be corrected by adjusting the position of the idler group,
Adjustment method: If the conveyor belt deviates to one side, the side roller group should be moved sideways in the direction of the conveyor belt advancement, or the other side roller group can also be moved backward (or the other side roller bracket should be properly raised) . The adjustment method of the return roller group is the same as that of the bearing roller group. For the conveyor system of longer conveyor belts, adjusting the roller set is very effective.
The adjustment of the reversing roller is an important part of the deviation adjustment of the conveyor belt. The installation position of the roller must be perpendicular to the center line of the conveying direction of the conveyor, otherwise deviation will inevitably occur. If the conveyor belt deviates to its right, the bearing housing on the right should be moved forward (or the left bearing housing should be moved backward); if the conveyor belt deviates to the left of the roller, the bearing housing on the left should be moved Move forward (or the right bearing block moves backward).
If the conveyor belt deviates relative to the driven roller, the adjustment method is just the opposite of the active roller.

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