Concrete pump truck is a kind of special concrete conveying machine with great mobility. Generally, concrete pump is installed on special vehicle or car chassis. It has the advantages of high pouring quality, fast construction speed and labor saving. It is an engineering project. The necessary concrete pump truck in the building. In the course of practice, concrete pump trucks will have some failures due to the difficulty of operation and the complicated structure.
1. Most of the places where the conveying pipe of the concrete pump truck is blocked are tapers and elbows that are easy to vibrate. Tap with a small iron rod along the conveying pipe. If the sound is crisp and the conveying sound is rustling, it means no Clogging phenomenon; if the sound is dull and the transmission sound is harsh, it means that the place is a blockage. At this time, the conveying pressure gradually increases, the pumping action stops, the hopper material level does not drop, the outlet of the pipeline does not discharge, the pump machine vibrates, and the pipeline mixing has strong vibration and displacement. The reverse pump can be operated, but the blockage occurs again after the positive pump is turned.
If the delivery pipe of the concrete pump truck is slightly blocked, first of all, the blocked part should be identified, and then the concrete should be loosened by shaking and hammering. Repeat the operation of the positive pump and the reverse pump to gradually draw the concrete into the hopper, and then Pump it again after re-mixing it. If the clogging problem cannot be ruled out by these measures, then the method of pipe removal should be taken to drain away the concrete blockage, and the pipe at the blockage can only be taken over after the pipe at the blockage is removed to avoid blockage again.
1. The hydraulic oil temperature of the pumping system is too high
In the process of continuous operation of concrete pump trucks, it is often accompanied by the impact of reversing pressure, and the pump system is reversing more frequently. The main hydraulic circuit of the pumping hydraulic system is a closed circuit, which is generally in a large flow state or a high pressure state. It is composed of 2 series main hydraulic cylinders and a bidirectional variable axial piston pump. Once the pumping system fails, it will inevitably The oil temperature of the concrete pump truck is too high. The main reason for the high oil temperature is due to improper adjustment, maintenance and operation of the components, or problems in manufacturing and design. Specifically, there may be the following reasons: first, the internal leakage of the hydraulic system is too serious; second, the relief valve does not unload or the setting pressure is too high; third, the heat sink of the cooler has poor heat dissipation and dust accumulation More; fourth, the cooler fan stops; fifth, the cooler is blocked; sixth, the low pressure relief valve setting pressure is too high or damaged; seventh, the boom hydraulic system is not unloaded; eighth, The amount of hydraulic oil itself is not enough. When the oil temperature rises too fast, or the hydraulic oil temperature is higher than the normal operating temperature of 30 ℃ ~ 80 ℃, you should find out the cause of the fault according to experience in order to take corresponding repair measures.
2. Common faults and elimination of mixing system
2.1 Mixing system leakage
Concrete pump trucks are generally equipped with lubricating equipment to prevent leakage of cement slurry at the mixing shaft. The distribution valve of the pumping system can complete the delivery of lubricating grease once every round trip, and then send the lubricating oil through the grease distribution valve to the mixing In the shaft bearing, in this way, it can effectively play the role of sealing and lubrication.
Once it is found that there is slurry leakage at the mixing shaft, it should be checked immediately whether the oil filter is blocked, whether there is oil in the grease pipe joint, whether the grease supply system is normal, and whether the grease distribution valve has lost its distribution function. If the wear is due to the long use time of the mixing system, then the components should be replaced in time and effective maintenance should be carried out.
2.2 Rotating failure of the mixing shaft
The mixing shaft is driven by a hydraulic motor, and the concrete tank is fed by secondary mixing of the concrete. Once it is found that the mixing shaft does not rotate or the rotation speed drops significantly, you should immediately check whether the mixing hydraulic motor is working properly, whether the pressure of the mixing hydraulic system is within a reasonable range, or appropriately increase the speed of the mixing shaft.
3. Blockage and elimination of the conveying pipe
Most of the places where the delivery pipe of the concrete pump truck is blocked are tapers and elbows that are easy to vibrate, and they are beaten with small iron rods along the delivery pipeline. If the sound is crisp and the delivery sound is rustling, it means there is no blocking phenomenon ; If the sound is dull, and the transmission sound is harsh, it means the place is blocked. At this time, the conveying pressure gradually increases, the pumping action stops, the hopper material level does not drop, the outlet of the pipeline does not discharge, the pump machine vibrates, and the pipeline mixing has strong vibration and displacement. The reverse pump can be operated, but the blockage occurs again after the positive pump is turned.
If the delivery pipe of the concrete pump truck is slightly blocked, first of all, the blocked part should be identified, and then the concrete should be loosened by shaking and hammering. Repeat the operation of the positive pump and the reverse pump to gradually draw the concrete into the hopper, and then Pump it again after re-mixing it. If the clogging problem cannot be ruled out by these measures, then the method of pipe removal should be taken to drain away the concrete blockage, and the pipe at the blockage can only be taken over after the pipe at the blockage is removed to avoid blockage again.
4. Improve the maintenance of the concrete pump truck
The maintenance of concrete pump trucks mainly includes accuracy inspection, regular inspection, regular maintenance, daily maintenance, equipment cooling system maintenance and equipment lubrication system maintenance. The daily maintenance of concrete pump trucks must be standardized and institutionalized, which is also the basic work of concrete pump truck maintenance. The regular inspection of the concrete pump truck is also called periodic inspection. It passes the inspection of human senses, instruments and tools. It is a kind of planned preventive inspection; regular maintenance should follow the pre-established material consumption quota and work quota Conduct an assessment. It is necessary to adhere to the maintenance procedures of concrete pump trucks in order to extend the service life of concrete pump trucks and ensure that the concrete pump trucks are in a safe and comfortable working environment. At the same time, we must pay attention to improving the quality of the operators of concrete pump trucks, which is the key to the management of concrete pump trucks. Cultivate employees' safety awareness, adopt flexible and diverse training methods for regular employee training, provide opportunities for further study, and encourage interaction between relevant work departments to reduce the frequency of accidents.
5. Strengthen the use and maintenance management of concrete pump trucks
In the maintenance and management of concrete pump trucks, one is the strict weekly inspection system and lubrication system. Carry out detailed daily inspections on concrete pump trucks by looking, listening, touching, sniffing, etc., fixed, qualitative, quantitative, regular, and regularly carry out lubrication maintenance and sanitary cleaning of concrete pump trucks, and strive to achieve the bottom of the trench and the axis Light and equipment see the true colors. The second is to increase training and improve the awareness of concrete pump truck maintenance. By knowing and training employees, they should be proficient in the performance, structure, use, principle and use methods of concrete pump trucks, improve production skills and safety skills, and reduce equipment failure rates. The third is to start from the daily bit by bit, and form a management model that guarantees by the day, by the tenth by the day, by the tenth by the month, and by the month by the year. Responsibility is assigned to people, management and maintenance are shared, and the long-term operation of concrete pump trucks is effectively promoted, laying a solid foundation for completing various production tasks.
