Solution In order to reduce the creep deformation of the cylinder at high temperature, we must find ways to reduce the temperature of the cylinder; in addition, replace the material with high temperature and strength on the bolt material; the material of the gasket should be reconsidered, choose A material that automatically compensates for gaps.
To this end, I have taken the following measures: (1) The circulating water pipe routing is changed into a parallel connection. The original circulating water pipe is firstly cooled by a pipe and then distributed to the primary and secondary cylinders. The cooling effect is not good. Now it is changed to install a water pipe from the main pipe for the cylinder, which improves the cooling effect of the two-stage cylinder. After such a change, the contact temperature of the cylinder surface of the secondary cylinder is significantly reduced, and the outlet temperature is also lowered by about 5 to 10 °C.
(2) Cleaning and descaling of the cooling water jacket and the air chamber Due to the long-term use, a thick layer of scale is formed on the wall of the water chamber and the air chamber, which seriously affects the heat transfer efficiency. In order to remove scale, we first soak it in sodium solution for 8 hours, then use iron to completely remove the iron scale on the wall until the original color of the body is exposed.
(3) Material for replacing the fastening bolt In order to minimize the tensile deformation of the fastening bolt at high temperature, a heat-strength steel with good oxidation resistance, high strength and good structural stability at high temperature is adopted: 15CrMo .
The addition of Mo enhances the heat resistance of the material, while the addition of Cr maintains the high strength of the material, which maintains the material properties at 500 ° C without change.
(4) The sealing material is changed from high pressure asbestos pad to graphite expansion pad. The new sealing material is graphite on both sides, and the middle is a thin steel wire mesh. Its characteristic is to expand after being heated, and automatically eliminate the gap caused by stretching.
(5) A seal is added to the positioning step of the two-stage cylinder block and the cylinder block to form a double-layer seal, and the material is PTFE.
(6) Change the convention, the assembly operation that is conventionally used in the new assembly operation method is to fasten the cylinder block and the cylinder block on the body of the lying column. It is difficult to be in the lying position due to the self-weight relationship of the cylinder itself and the limitation of the operating position. The upper bolts are tightened very evenly (because there is no torque wrench). Now it is installed in a horizontal position, the operator is easy to fasten and the strength is as uniform as possible.
(7) Increasing the sealing area First, the sealing curve is printed with asbestos stencil, and then the sealing surface is dislocated and becomes smaller and the welding is about 5 to 6 mm, and then flattened.
This increases the sealing area.
(8) The cooling core of the intercooler is subjected to a withstand voltage test to ensure no leakage.
After the two air compressors were modified, the phenomenon of air leakage in the secondary cylinder disappeared. Since the operation in June 1998, no such failure has occurred. The inferior problems that have plagued our power work area have been solved.
Automobile wiper rubber strips are gaining more and more attention. In the future, the trend of maintenance-free development of automobiles and the increasing production of automobiles have made the wiper rubber strips, which are safety components for automobiles, more and more important.
According to the raw materials used in the production of wiper rubber strips, it can be mainly made of diene rubber with NR, SBR, BR, CR as the main raw materials, and then with a suitable compounding system, and manufactured by molding or continuous vulcanization. However, since the unsaturated main chain of the diene rubber is difficult to resist the external environment and the aging of ultraviolet rays, heat, stress, oxygen and ozone, the wiper rubber strip is easily aged, thereby affecting the brushing effect and reducing the safety performance. , shortened the service life. In the second period, from 1965 to the early 1990s, in order to overcome the shortcomings of poor aging resistance of diene rubber, the United States, Canada and other countries began to use EPDM with excellent aging resistance as the main raw material of wiper rubber strip. Heat, oxygen, UV and ozone aging properties are guaranteed. However, due to the intractability and non-slipiness of the surface of the wiper rubber strip, the brushing effect is poor. In recent years, developers have considered that the diene rubber is still a wiper rubber strip material with excellent comprehensive performance from the viewpoints of driving safety and brushing effect.
The curved arm aerial work vehicle is widely used for installation, maintenance and climbing operations in municipal, electric power, street lamp, advertisement, communication, photography, garden, traffic, wharf, airport port, large industrial and mining enterprises and other industries.
It is applicable to all kinds of rugged terrain in the field and has a wide range of space operations. It is mainly used for construction machinery and equipment of buildings, bridge construction, ship manufacturing, airports, mines, port terminals, communication and power facilities and outdoor advertising.
It can be hung on the car, synchronized with the car, and suitable for field high-altitude operation. Lifting mode: 1. Use 380-220v power supply. 2. It is inconvenient to use power supply. You can use battery to drive the lifting. Beautiful appearance and convenient walking.
Install the crank arm elevator on the vehicle and use the vehicle power to drive the lift. Suitable for long-distance field work at height.
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