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Snap rings, also known as retaining rings or circlips, are small but essential mechanical components used to secure parts within a housing or onto a shaft. They are commonly employed in various machinery and automotive applications to prevent axial movement and ensure stable positioning of other components. Snap rings are typically made from spring steel or other high-strength materials, providing the necessary resilience and durability for their function. Their design involves a circular ring with a radial or tangential gap, allowing them to be compressed and then snapped into a groove or slot on a shaft or in a housing. This compression provides a tight fit, holding the ring in place and effectively preventing parts from moving out of position. There are two main types of snap rings: internal and external. Internal snap rings, or internal retaining rings, fit inside a bore or hole and are used to hold components in place within a cylindrical housing. External snap rings, or external retaining rings, fit around the outside of a shaft or other cylindrical part, securing it against axial forces. The installation of snap rings is straightforward, often requiring only a pair of snap ring pliers to compress and fit them into their designated grooves. Their removal can be accomplished in a similar manner. Snap rings are valued for their simplicity, reliability, and ease of use, making them indispensable in assemblies where space is limited and a secure fit is crucial.
The following factors need to be considered when choosing a suitable internal circlips: Size: The size of the internal circlips includes the diameter of the ring, the inner diameter, the outer diameter, and the groove depth, etc., which need to be selected according to relevant standards and specific application requirements. For example, the diameter of the internal circlips should be 1-2mm larger than the diameter of the connector, and the thickness can be selected according to the tightening force and compressibility of the connector. Material: Internal circlips are generally made of metal, and the common ones are stainless steel and carbon steel. The selection of materials needs to consider their corrosion resistance, high-temperature resistance, and tensile strength. For example, stainless steel has good corrosion resistance and is suitable for humid or corrosive environments. Structure: Internal circlips are divided into single-piece and double-piece types. Single-piece retaining rings have only one ring, while double-piece retaining rings consist of two, which can better fix the shaft. Installation method: The internal circlips can be installed by pressing or knocking in. When installing, the circlip pliers are used to insert the plier's mouth into the clamp hole of the retaining ring, and the retaining ring is clamped and placed in the pre-processed circular hole inner groove. Application scenario: internal circlips are widely used in various mechanical transmission systems, such as automobiles, machine tools, agricultural machinery, etc. In these fields, it can effectively prevent axial sliding and axial shedding, and improve the stability and reliability of the machinery. Common models and specifications of internal circlips: Common internal circlips models include type A and type B. Type A is made by a plate punching process, and the cross-section is usually square or rectangular; type B is made by a wire punching process, and the cross-section is round. Specifications include orifice diameter and retaining ring thickness. For example, the orifice diameter of the M10 internal circlips is about 10.5mm, and the retaining ring thickness has a variety of options such as 1.25mm, 1.5mm, 2mm, 2.5mm, 3mm, etc. Advantages of internal circlips: internal circlips have a compact structure and stable performance, save space, and can adapt to various harsh environments. Its installation method is simple and quick and can be carried out by pressing or knocking in.
When using the internal circlips in a high-temperature environment, the following points should be noted: Choose the right material: In a high-temperature environment, a high-temperature resistant material such as polytetrafluoroethylene (PTFE) should be selected. Polytetrafluoroethylene has excellent high-temperature resistance, and a wide range of operating temperatures, can maintain stable performance at high temperatures, and will not age. Installation and maintenance: In a high-temperature environment, the installation and maintenance of the internal circlips are particularly important. Check the status of the retaining ring regularly to ensure that it is not damaged or failed. Once damage or failure is found, it should be replaced immediately to avoid damage to other mechanical parts due to the failure of the retaining ring. Use environment: In harsh environments such as humidity, corrosion, high temperature, and high pressure, protective measures should be strengthened. Ensure that the use environment of the retaining ring is dry and clean to avoid the effects of corrosion and high temperature on the retaining ring. Pressure bearing capacity: The pressure bearing capacity of the retaining ring varies depending on the material and structure. In a high-temperature environment, the retaining ring may be extruded due to excessive pressure. Therefore, it is necessary to select appropriate retaining ring materials and structures according to actual use conditions to ensure that its pressure-bearing capacity meets the use requirements. In short, correctly selecting internal circlips made of high-temperature resistant materials and strictly installing and maintaining them by standards can effectively extend their service life and ensure the safe and reliable operation of mechanical equipment.
On the morning of December 24, 2021, Anhui Ningguo Dongbo Fastener Co., Ltd. of Ningguo City, Anhui Province (hereinafter referred to as Dongbo Company) and Nanjing Iron and Steel Co., Ltd. (hereinafter referred to as Nanjing Iron and Steel) signed a strategic cooperation agreement to establish a "High-quality Fastener Joint R&D Center" in the conference room on the second floor of Dongbo Company's comprehensive office building. Dai Rirong, Chairman of Dongbo Company, Dai Zhong, General Manager, Zhu Dinghua, Deputy General Manager of Nanjing Iron and Steel Division, and Da Jianlin, Sales Director, attended and witnessed the signing ceremony. Tong Chao, Deputy General Manager of Dongbo Company, and Li Yingkui, Deputy Director of the R&D Department of Nanjing Iron and Steel Division, signed the strategic cooperation agreement as representatives of both parties. Signing ceremony site At the signing ceremony, the general manager of Dongbo Company first delivered a speech, in which he expressed his sincere welcome to the leaders of Nanjing Iron and Steel. As the first high-tech enterprise in China to implement the integration of "production, sales and research", Nanjing Iron and Steel has become a first-class steel enterprise with excellent products, good services, and strong strength through the implementation of the "steel + new industry" development strategy and continuous technological innovation in recent years. The two parties have established a deep friendship through sincere cooperation for more than ten years. The signing of the "High-quality Fastener Joint R&D Center" between Dongbo Company and Nanjing Iron and Steel is of great significance. It is hoped that both parties can make the best use of their strengths avoid weaknesses, and cooperate in all aspects in the development of new varieties of high-quality fasteners, quality improvement, failure analysis, information interconnection, and coordinated cost reduction, to quickly respond to market demand, increase the market share of both parties, achieve the goal of win-win cooperation, and continuously consolidate and strengthen the strategic cooperation relationship between Nanjing Iron and Steel and Dongbo Company. Chairman Dai and his delegation visited Nanjing Steel for exchanges. Zhu Dinghua, deputy general manager of Nanjing Iron and Steel Division, said that the purpose of his visit to Dongbo Company was cooperation and learning. He was very grateful for the warm hospitality of Dai Rirong, chairman of Dongbo Company, and Dai Zhong, general manager. The two sides carried out strategic cooperation through the "Nangang-Dongbo Joint R&D Center" platform, which not only complemented each other's strengths and built a sustainable and high-value cooperation model, but also consolidated and enhanced the strategic partnership between Dongbo Company and Nanjing Steel, and established the leading position of both parties in the high-quality fastener industry. Together, we will focus on the difficulties and pain points of the design and manufacturing of high-quality fastener steel, conduct joint research and development, and promote the rapid development of high-quality fastener steel products and technologies to enhance the core competitiveness of my country's fastener industry chain. Zhu Dinghua, Deputy General Manager of Nanjing Iron and Steel Division, delivered a speech. In this cooperation, both parties will uphold the principle of win-win cooperation enhance the competitiveness of both companies, and expand the social influence of their corporate brands by establishing a long-term, comprehensive strategic cooperative relationship. Both parties will give full play to their respective advantages and work together to create high-quality fastener industry advantages and achieve high-quality corporate development. Participants took a group photo. Nanjing Iron & Steel Co., Ltd. is a national high-tech enterprise. It was rated as the highest level "A+ highly competitive" enterprise in the competitiveness rating of 108 steel enterprises. The company has an annual comprehensive production capacity of 9 million tons of pig iron, 10 million tons of crude steel, and 10 million tons of grade steel. In recent years, it has won more than 30 provincial and ministerial science and technology progress awards, including 3 national awards, undertaken more than 30 provincial and above science and technology projects, and authorized more than 1,000 patents; its products are exported to more than 50 countries and regions along the "Belt and Road".
On July 1, 2024, the testing center of Anhui Ningguo Dongbo Fastener Co., Ltd. was approved by the China National Accreditation Service for Conformity Assessment, officially obtained CNAS accreditation qualification, and was awarded a laboratory accreditation certificate. CNAS Laboratory Accreditation Certificate The testing center of Anhui Ningguo Dongbo Fastener Co., Ltd. covers an area of about 1,000 square meters. It has 9 testing rooms including salt spray testing, metallographic cleanliness testing, three-coordinate testing, etc. It is equipped with nearly 100 sets of various testing instruments and auxiliary facilities and equipment. The testing center has established a quality system to comprehensively control the laboratory's "people, machines, materials, methods, and environment." Testing Center-Performance Analysis Room CNAS is a qualification that confirms whether an organization is capable of carrying out corresponding conformity assessment activities (such as certification, testing and calibration, inspection, etc.), and has high authority at home and abroad. Accredited testing laboratories will be included in the list of CNAS-approved accreditation bodies, and will issue test reports for projects within the scope of accreditation, which can be stamped with the CNAS accreditation mark and the ILAC-MRA/CNAS international mutual recognition joint mark. The test results can be recognized in more than 60 countries and regions. The projects approved by CNAS for the testing center of Anhui Ningguo Dongbo Fastener Co., Ltd. cover 5 types of test objects, including metal materials and products, stainless steel, carbon steel and medium and low alloy steel, general parts (geometric quantities) and retaining rings for holes and shafts, 16 test standards (methods), and more than 20 test items/parameters. ZEISS scanning electron microscope and three-coordinate measuring equipment imported from Germany Obtaining CNAS accreditation indicates that the testing capabilities and qualifications of the testing center of Anhui Ningguo Dongbo Fastener Co., Ltd. have reached national standards, highlighting the scientific research and testing capabilities of the testing center.
To carry out the theme activity of studying and implementing Xi Jinping's Thoughts on Socialism with Chinese Characteristics for a New Era in a solid manner, and by the theme education work plan of the company's party branch, based on in-depth theoretical study, on July 6, 2024, the party branch of Dongbo Company organized party members to go to Jingxian County to carry out red education activities. Recalling the difficult years and tracing the red footprints Green mountains and clear waters retain the heroic spirit, and green pines and cypresses comfort the heroic spirits. In the solemn and dignified Southern Anhui Incident Martyrs Cemetery, all party members listened carefully to the explanation and learned in detail about the glorious course of the New Fourth Army's heroic resistance against Japanese aggression and sacrifice for the country. In the exhibition hall, a large number of precious historical photos and revolutionary relics truly show the tragic history of the Southern Anhui Incident. In the memorial corridor of the Martyrs Cemetery, there are nine circular giant pillars with traditional characteristics of Southern Anhui, of which only two are complete, and the rest are uneven broken pillars, implying that most of the 9,000 warriors died and 2,000 people successfully broke through. Under the memorial tower, everyone bowed in silence to the revolutionary martyrs with reverence, deeply mourned and remembered the revolutionary martyrs, and recalled their great achievements. Review the Party oath and continue the red bloodline. Facing the bright red party flag, all party members lined up and, under the witness of the Southern Anhui Incident Revolutionary Martyrs Monument, firmly raised their right fists and re-read the party oath with a clanging sound, expressing their determination to cherish the memory of the martyrs and be loyal to the party. Re-reading the party oath is not just a simple reading, but the most sacred oath, the most solemn commitment, and the heaviest responsibility of party members under the party flag. The sonorous and magnificent oath strongly shocked every party member present, and every word was sacred and heroic. Ignite the dreams of youth and inherit the red spirit. To enable the company's party activists to receive the red spirit baptism and further strengthen their ideals and beliefs, the company's party activists also participated in this red education activity. In the New Fourth Army Headquarters Exhibition Hall, historical objects and precious photos vividly reproduced the glorious years of the revolutionary predecessors' heroic struggles, allowing the party activists to feel the revolutionary predecessors' heroic journey of creating glory in suffering, and receive a profound party education and baptism of thoughts and souls, to establish patriotic consciousness, cherish the memory of revolutionary martyrs, inherit the red gene, ignite youthful dreams, and join the great and glorious Communist Party of China as soon as possible with more outstanding work achievements. Through this red education activity, everyone solemnly remembered the martyrs, paid tribute to their ancestors, and deeply understood their lofty beliefs and firm convictions. All party members and party activists are determined to do everything well with a sense of responsibility and mission in their future work and study and devote themselves to the new round of development of Dongbo Company with more enthusiasm and high spirits.
To thoroughly implement the "Law of the People's Republic of China on the Prevention and Control of Occupational Diseases" and "Measures for the Supervision and Administration of Occupational Health Monitoring of Employers" (Order No. 49 of the State Administration of Work Safety), strengthen occupational health monitoring, and further protect the health rights and interests of employees. From November 2 to 3, 2024, Dongbo Company commissioned Ningguo Jianmin Hospital to carry out a two-day occupational health examination in the factory staff restaurant. To ensure the smooth progress of this physical examination, the company's administrative department actively coordinated with Ningguo Jianmin Hospital formulated a detailed physical examination schedule, and issued physical examination notices in advance to ensure that all employees exposed to occupational hazards should be examined. The physical examination mainly included more than ten examination items, including blood routine, urine routine, electrocardiogram, chest X-ray, audiometry, facial examination, abdominal color Doppler ultrasound, etc. During the physical examination, the employees lined up in an orderly manner, and under the guidance of the on-site medical staff, they underwent examinations item by item. Our company has always attached great importance to the occupational health of employees, actively carried out occupational disease prevention and control work, continuously improved the working environment and living environment, provided protection for the health of employees, and regularly and irregularly organized inspections on the implementation of occupational disease prevention and control measures. At the same time, we have established and improved the occupational health management system, improved the management mechanism of labor protection supplies, strengthened occupational health publicity and education and training, and fundamentally changed the employees' understanding of occupational disease hazards. This health checkup of all employees who are exposed to occupational disease hazards is a real and hard move to actively implement the company's people-oriented and sincere care for employees, which has been unanimously praised by employees. Through this health checkup for all employees, employees can achieve "early detection, early diagnosis, early prevention, and early treatment", building a safety barrier for the health of all employees. Employees have expressed that the annual occupational health checkup is very necessary, and they will be more conscious of doing a good job of individual protection and strengthening physical exercise at work in the future, to devote themselves to the new round of development of the company with a healthy body and full spirit.
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