Two small improvements in the air compressor
Tianjin Beichen Hydraulic Excavator Protection Bucket Cylinder Automatic Downward Difficult Analysis Day Chen Chuangyu 2005 Hydraulic Excavator After using the time, the piston rod of the bucket cylinder automatically operates the rod in the neutral position due to the gravity of the bucket When, when, when working, I do not have enough digging power. This phenomenon indicates that the hydraulic system is leaking, according to the original hydraulic diagram analysis of the machine. There are two possibilities for internal leakage: 1 The piston seal of the protective oil is not tightly sealed and the cylinder is leaking. 2 The valve of the main control valve is forgotten and the valve body is worn, and the sealing is not strict. The hydraulic oil flows back to the fuel tank from the rod cavity of the Sadou cylinder through the oil pipe and the main control valve. The valve core and valve body of the main control valve have been specially handled, and the valve core and the valve body are not easily damaged by normal use. Through analysis, it can be judged that the Yidou cylinder is leaking. When the oil level is found, the piston ring and the seal ring are broken, and the cylinder is pulled. In order to avoid this loss, it is recommended to replace the secondary cylinder seals for two years depending on the design life of the component.
Author Tonglian: Guangdong hits the water and electricity 2 Guangdong Zengcheng County new "town" [Edit Qiaogan flowmeter and digital loop regulator does not match the solution day Li Xiuzhi I plant two joint workshop LWGY type disaster wheel flowmeter and D600 digital loop adjustment smart, Due to mistakes in the original design selection, it was impossible to use it, and it was normal production.
The flowmeter has been improved to obtain a relatively slim effect.
LWGY type is a kind of speed type flowmeter. The working principle of the flowmeter should be enlarged before. Figure 1. The induced pulse signal is generated at both ends of the induction coil. The output waveform is amplified by two stages of 86, 82. Wave, frequency 0~1, peak voltage about 6.8V. The digital loop regulator D600 is manufactured by American SAR Company. Its digital input terminal can only receive pulse signals of 0~10k and peak voltage of about 5V. Thus, the input range is smaller than the output range of the flowmeter. Causes the impedance of the two to not match.
After the system analysis and calculation, add a zero resistance at the output end as shown by the dotted line in Figure 1. After field measurement, the output waveform is still square wave, the frequency is in the range of 0101, and the peak voltage is about 5Â¥. Thus, the output signal of the thirsty wheel transmitter is reduced to the digital loop regulator to receive the pulse signal. Both instruments will work properly.
After the technical improvement, after nearly two years of operation, the measurement is sensitive, accurate, and timely reflects the clever data of the production process, providing a reliable guarantee for safe production. This time, a total of 9 instruments were improved, avoiding the purchase of new instruments and saving more than 70,000 yuan.
Author Tonglian; 1 oil smart refinery instrument workshop, Nanyang City, Henan Province [Edit Wu Siming]
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