The motor 1 drives the air compressor 2 to operate, and the air compressor sucks air with a certain moisture to be compressed by the air compressor to generate compressed air, and the compressed air enters the large and small accumulators 3 and 8 to store energy, when the accumulator When the pressure of the compressor reaches 7 MPa, the pressure relay 7 operates, the motor stops rotating, and the compressor stops the compressed air. When the accumulator pressure drops to 4 MPa, the pressure relay operates and the compressor operates again. The compressed gas enters the accumulator in the compressor, and after the water separation is performed in the accumulator, the compressed air passes through the shut-off valve 4 at a pressure of not less than 4 MPa, enters the water-separating filter 5 for secondary moisture separation, and then enters the oil. The mister 6 leads to each branch gas path and each pneumatic component, and generates power by the compressed air to activate the pneumatic component.
According to the working principle of the above pneumatic system, the water entering the system mainly comes from not only the large amount of maintenance, but also the production, and a large amount of spare parts occupy funds, and there is no dust removal equipment; the dust of the crusher and the sieve machine is large, and the environment and The post is polluted and can only be dusty. To this end, the stop 2# ash system was selected, and the 2# ash was incorporated into the 1# system. The modified content stopped 2# system (a total of 6 equipment was deactivated) to make two belt conveyors, one buffer tank. The ashing process after the transformation is: 2# kiln white ash→uphill belt conveyor→horizontal belt conveyor→buffering bin→1# main ash belt conveyor.
According to the above discussion, only the improvement of the water separation capacity of the gas path and the reduction of moisture entering the system will prevent the water from freezing in the gas path. Therefore, the following measures are implemented: according to the principle of the water separator, A number of water separators 8 are added to each branch of the gas path system, and the gas is added to the first stage before the pneumatic components are added to further separate the moisture and reduce the moisture into the pneumatic components; in the large accumulator 3 and A condenser is added between the air compressors 2. Since a condenser is installed between the compressor and the accumulator, the high temperature gas can rapidly and greatly reduce the temperature, and in the winter, the high temperature gas is pressurized from the air compressor. The temperature after the energy device is reduced from 120 ° C to 20 ° C. According to the first law of thermodynamics and the Linde D Hampson principle, the more the temperature decreases, the more the water vapor liquefaction. In addition to the cooling and cooling effect of the condenser, the condenser can also partially separate the moisture due to the temperature drop of the gas in the inlet and outlet ports. Through this measure, the ability of the accumulator to separate moisture can be greatly improved.
Through the transformation of the system, we changed the two-stage moisture separation design of the original system to the fourth-stage moisture separation, and enhanced the water separation capacity of the accumulator through the cooling effect of the condenser. Through the above two transformation measures, basically The separation of moisture in the air enhances the antifreeze capability of the pneumatic system and ensures the reliability of the winter pneumatic system. The condenser was fabricated with reference to the heat sink principle and will not be described here.
Conclusion The key to completely solve the problem of pipeline freezing in electric excavators and rigs is to reduce moisture entering the system piping. There are many sources of water entering the system. We have developed measures for the impact of product quality factors and human factors such as moisture in the antifreeze solution or the driver's inefficient discharge of water in the system. In view of the main problem of the design of the separation of moisture in the pneumatic system, we have carried out the transformation and implementation according to the demonstration research in this paper. Through the above various means, the freezing phenomenon of the electric excavator and the rig winter system is greatly reduced, reducing the winter. The occurrence of gas path failures has improved the reliability of the winter gas path system. The most important thing is to avoid some accidents caused by the freezing of the gas path and the failure of the system.
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