Improved design of piston connecting rod assembly for oil-free lubricating air compressor

Improved design of piston rod connecting rod assembly for oil-free lubricating air compressor 耿爱农李辛沫陈君立排勤江21.邑 University, Guangdong Jiangmen 5,02,2. Zhejiang Hongyou Compressor Manufacturing Co., Ltd., Zhejiang Wenling 317523 board fastening The connecting structure of the big-head bearing of the connecting rod, etc., replaces the original screw thread fastening method by using the expansion bolt fastening method, and the loosening of the live base cover of the ice-removing plant is replaced by the field-mounted screw fastening to replace the original center. The tightening of the screw + enhances the anti-loose ability of the piston cover. The finished bearing housing 1 combined with the heating method is used to replace the original split-groove bearing housing hole 4 screw, and the bearing is tight. The efficiency has improved the service life of the connecting rod big head bearing.

l The small swing piston type oil-free lubricating air compressor appeared in the last belly of the 70th generation. With the breakthrough of the sealed bowl lining, this type of compressor has obtained a rapid hairpin in the past 10 years. The proportion of small air compressors of 2 and below occupies a considerable proportion, which is the main variety of many private air compressor enterprises in China, especially export-oriented SMEs.

The former is still based on imitation. Although the structure and parameters of foreign prototypes are copied, the manufactured products do have a large quality gap with the products produced by foreign advanced enterprises. The reason is that in addition to the backwardness of the tooling technology of related enterprises in China, the employee model of the enterprise, coupled with the greater mobility of the workers, results in the fact that the structural processes or processes that foreign companies do not ask at all become product quality in China. Frequent source.

As is known to all, the products of many private air compressor enterprises in China are based on the piston rod connecting rod components of the core components of such compressors. The closing date of the 25 is far less than that of foreign companies. In view of this, this article starts from the improvement of the current fund project Guangxi manufacturing system and advanced manufacturing technology key laboratory project Guike can have the structure and technology of the piston rod assembly, and strive to make it 0710 Na 2; Jiangmen City Science and Technology Project Jiang, Worker 120091 and the assembly process to do fool-like operation to eliminate the quality hazard caused by human factors.

2 original piston rod assembly Introduction Piston rod assembly of the press. Different from oil-lubricated compressors, the biggest feature is that the piston and the connecting rod are in a body structure, and they work in a reciprocating + rocking composite motion with respect to the cylinder during operation. The piston connecting rod assembly is composed of these parts and components, the piston cover sealing cup, the piston body connecting rod and the connecting rod big head bearing, wherein the piston body and the connecting rod are of a body structure, and the piston cover and the sealing cup are fixed by a fastening screw. Fastened and connected to the piston body, the cracked groove is formed on the large bearing hole of the connecting rod, and the tightening degree of the adjusting bearing is set. The piston connecting rod assembly generally used by the small and medium-sized enterprises in China is too weak. Among them, the first to third causes the screw to be tight or the phenomenon of false tightening. The fourth reason is that it is assisted on the basis of the first cause, because the cup and the cylinder are slightly in the process of the rocking fit. Torsional friction resistance manufacturing error assembly error and force deformation cause the cylinder to generate deflection friction torque to the piston.

The reason why the bearing life is not up to standard is that the pre-tightening force of the clamping bolt is too large or too loose when installing the big-head bearing of the connecting rod, and as a result, the bearing is loose or the deformation is stuck, which eventually leads to premature failure of the bearing.

The above-mentioned accidents are obviously mainly based on the improvement of workers' quality and management, and the strict quality supervision. It can also improve the original structure and process through tooling improvement, so as to avoid or reduce the opportunity for workers to make mistakes. This is a Very worthwhile to explore.

Industry products.

Improve the design and discussion of the piston cover fastening screw sealing cup The above-mentioned piston assembly is prone to the following phenomenon during use; secondly, the service life of the connecting rod big head bearing is far from the design requirement. After careful analysis and discussion, the above hidden dangers can basically rule out the reasons for the quality of the design materials and accessories, and most of them are caused by the workers not operating according to the process specifications. The cause of the accident may be that the threaded bottom hole is not in place or tilted or The diameter of the bottom hole is too large; the tapping screw is not open to the end or the quality of the open tooth is unqualified; the pre-tightening force is insufficient or too tight when tightening the screw; the above-mentioned deficiencies of the swing piston type oil-free lubricating air compressor are proposed by the author. The improved design reference 2 mainly involves the fastening method of the piston cover plate and the improvement of the installation method of the connecting rod big-head bearing. Although it is a simple and easy measure, the practice proves that it has a shadow on the foreign-inspired model. The effect of the following is an introduction to the improvement of the idea and discussion of the piston cover expansion screw sealing cup. The original method of screwing the piston cover is improved to the way of fastening with the expansion bolt 3, that is, pre-fixing the bottom of the piston body a hole, and then a sealing cup is mounted, and then the piston cover is fastened to the bottom hole with an expansion bolt having a hole and a slit at the lower portion, and the expansion bolt is A wedge is placed in the inner hole, and then the tamping screw is implanted in the middle of the piston axis through a tooling. The anti-piston cover is embedded in the pan and the shack is forced to expand and open with the piston technology. The body forms an over-tight fit.

The improvement brought by the improvement is that the fastening structure is dependent on the 1st installation, and the error of the bottom hole is not sensitive to the fastening effect, especially the efficiency is improved compared with the conventional fastening method, and the improvement is proved to be the hall. Effective.

The fastener is improved from the center layout to the offset layout relative to the piston axis.

As mentioned above, the piston rod assembly has vibration swinging and deflection during operation. The tightening ability of the conventional center-mounted fastening screw to the cup and the piston cover is weak. After that, the eccentricity becomes the torque arm of the fastener against the looseness of the piston cover. Whether it is screwed or fastened with an expansion bolt, it can be used for adults and strong anti-loose ability.

The cleavage structure of the large-end bearing housing hole of the connecting rod is removed and replaced with the traditional complete seat hole structure, and the bearing is assembled by the heating and fastening method, and the over-the-counting mountain can be designed according to the hole size of the bearing material of the connecting rod material and the working temperature projection. The report over-the-counter shows the assembly heating temperature of the connecting rod. This method belongs to the traditional interference assembly method. It is a very reliable tight fitting method, and it is very convenient for tooling implementation. It also eliminates the cracking tapping screw and tightening. Solid processes, reducing interference from human factors, can effectively improve bearing reliability and working life.

4 Conclusion The piston rod assembly is the core component of the swing-type oil-free lubrication air compressor. It is more dependent and sensitive on the existing structure and the factors of the artist. It is easy to induce quality and improve the fastening of the hard cover. The assembly structure and assembly method of the large-head bearing of the connecting rod can effectively eliminate the hidden dangers of the accident, improve the reliability of the compressor, and improve the work efficiency, which can achieve twice the result with half the effort.

Publishing House, 2001.

3 Zhejiang Hongyou Compressor Manufacturing Co., Ltd. Compressor piston connecting rod assembly IF.ZL2009201885312 4 Zhejiang Hongyou Compressor Manufacturing Co., Ltd. A combined air compressor piston manufactured by iF.ZL2010201098593.

The solution manually installs the required files to the root of the target application installation.

4 Conclusions Effectively (1) The hybrid programming method of Feihe Lushan in the component technology of the factory, with the help of the rich function library and shape library, effectively reduces the difficulty of writing the algorithm, and the execution efficiency is greatly improved than the 1 file, and the application The program can be completely separated from the working environment of the disc. In order to realize the rapid analysis and display of the vibration signal of the reciprocating compressor, the method is applied to the development of the signal processing system of the reciprocating compressor. The result shows that the method has achieved good results in the numerical calculation and shape processing of human-machine friendly interaction of the signal processing system of the reciprocating compressor, and has wide application value.

He Kezhen. Standard displacement spectrum of bearing housing vibration of single cylinder reciprocating gas compressors 3 Tan Yiping, Wang Zhenqing. VB and Matlab mixed to achieve the spectrum analysis of vibration signals, physical testing, 200423032 4 Liu Xianyong, Hu Jinsong, Zhou Fangjie, and so on. Based on 01, 13 must be combined with + +8 ports for computer programming, and 20 for 301560 School of Engineering and Engineering. The main research direction is equipment fault diagnosis.

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