How did the diaphragm coupling develop abroad

Diaphragm coupling is a very important part of the transmission machinery, which plays a very important role in the rolling of the machine. Diaphragm couplings are widely used at home and abroad? The following is the editor's introduction about diaphragm couplings The content, I hope that we will have a harvest!.

Development of diaphragm couplings at home and abroad

　　The skills and production of diaphragm couplings in our country have experienced four stages: the first stage is that in the 20s and XNUMXs, the first stage was mainly self-sufficient. Cooperating with various mechanical equipment to make some couplings, the characteristic is power. Small, few types, unplanned; the second stage is the XNUMXs and XNUMXs. Following the opening up, some patented skills and foreign advanced machinery and equipment were introduced, which helped develop and promote the use of coupling skills in China. Key role.The third stage is from the XNUMXs to the XNUMXst century. After nearly XNUMX years of development, with the efforts of domestic mechanical engineers, the couplings produced can basically meet the domestic requirements. Professional and professional standard system.The fourth stage is from the XNUMXst century to the present. With the development of modern high technology, the domestic scientific and technological independent research and development capabilities and the enhancement of innovative skills, the rapid development of the coupling industry in my country, the emergence of a luxuriant class, and the development of domestic coupling Be in line with the standards, and even exceed the norms in some skills.
　　 In foreign countries, the research on couplings started early, and most of the couplings produced are mainly specialized. One of the characteristics of coupling manufacturers is that they have high product skills and are accustomed to the technical requirements of heavy machinery at that time and processing equipment. Advanced, supporting castings and forgings, hydraulic and electrical components, advanced handling, and attach importance to skill development and skill improvement.
　　 The high-elasticity coupling is installed at the output end of the diesel engine, and its function is to transmit torque; adjust the transmission device shaft system to change the oscillation characteristics; compensate the center displacement of the main and driven shafts caused by oscillation and impact; buffer and absorb vibration.Because of the transmission function, high-elasticity couplings are widely used in diesel engine power plants, and they have been rapidly developed at home and abroad in recent years.The Geislinger, Vulcon and RATO couplings widely used on ships have all constituted standardized and serialized products.Non-metal elastic element The elastic element of the elastic coupling transmits torque under the condition of being compressed, sheared and compressed, and changed.The elastic modulus can be changed greatly, and different stiffness can be easily obtained. The rubber can be firmly bonded to the metal surface by vulcanization, and the large-scale flexible coupling can be formed by elastic elements with simple shapes; and the internal conflict is large and the quality is small. , Storage per unit volume has a large variable function, good damping function, no mechanical conflict and sliding, and no need for smoothness and other advantages.Rubber is the most used material among the non-metallic elastic materials used in couplings.
　　 Foreign countries have begun to produce and research rubber elastic couplings since the 20s. For example, Germany has successively developed new couplings such as Vulcon EZS and RATO; the new coupling devices developed by Geislinger in Australia are in Kuntsen’s two diesel oil tankers with a capacity of 50 tons have achieved outstanding effects; the CA type tire coupling produced in Japan and the RF type tire coupling produced in Germany. The elastic elements are made of elastic rubber and reinforced tires. Made of high-strength nylon wire cloth; the tightening stress type coupling developed in Japan, because the torque transmission is completed by means of deformation stress, the coupling is used for forward and reverse operation, and it is very accustomed to the machine that starts frequently and intermittently; The rubber sleeve coupling developed by the Japanese Society of Mechanical Engineers in 2 is widely used in pumps, blowers and compressors.
　　 The domestic production and research of flexible couplings began in the late 70s. Most of the domestic flexible couplings are based on foreign couplings and improved according to their own needs.For example, the domestically produced TD type tire coupling is a series of products of the top heavy machinery factory. Its structure is similar to the CA type and RF type tire coupling, but the planning and accounting are different, so the dimensions of each part are different. The XL series high elastic rubber coupling is a standardized series of high elastic rubber couplings developed by our country with the concept of serialization, standardization and generalization. It has won the National Science Conference Achievement Award.The quincunx-shaped coupling is to install a whole quincunx-shaped elastic ring between the claws of two half-couplings of the same shape to complete the connection of the two halves of the coupling, passing through the gap between the claws and the elastic ring. The kneading transfers the power, and the relative deviation of the two shafts is compensated by the elastic deformation of the elastic ring to complete the damping and buffering.The elastic movable pin coupling is a new type of high-function coupling developed by our country. It combines the advantages of different structures of the existing standard elastic couplings. For example, it has the advantages of the plum-shaped elastic coupling: the elastic element is kneaded, The structure is simple and the reliability is high, which overcomes the inconvenience caused by the quincunx-shaped elastic coupling when replacing the elastic element. The EZ, EZR and LB type high elastic couplings are formed by metal connectors and elastic elements that are clamped under the pre-tension of the bolt group. The elastic elements are vulcanized and tightly combined with rubber and ply.In addition, the couplings of non-metal elastic components such as rubber include LC (change shear type) and LB (kneading type) series high-elastic couplings developed by Dahua Coupling Factory of the domestic 711 Research Institute.
　　 Comparison of couplings at home and abroad: The skill level of couplings, whether it is structure or technical parameters and functional indicators, most of them reach the level of similar foreign products; but the distance is relatively large in terms of product processing accuracy, quality and service life .The primary reason is that one is related to the way of organizing production, planning and management level, and the other is the relatively obsolete processing equipment, low production power and poor processing accuracy.
　　 In recent years, my country has also made some progress in the research of elastic couplings, especially in some key skills and industrialization. For example, Professor Wang Jiaxu of the Key Laboratory of Mechanical Transmission of Chongqing University and others after years of painstaking research, The development and promotion of the coupling is very successful.
　　 In order to complete different working conditions, the coupling can meet the requirements of vibration reduction, noise reduction, long life, and large torque. Together, for repair, installation and heat dissipation convenience and prevention of resonance.At present, the research direction of elastic couplings at home and abroad is the primary direction: select new materials, especially new materials for rubber components, and improve the mechanical properties of the materials through formulas and vulcanization processes; select new structures and new structures independently developed. Satisfy the torque or motion transmission under specific working conditions; choose new skills, such as the bonding skills of metal and rubber, to improve the function of the star-shaped elastic coupling; choose new accounting methods, and the development of accounting machines promotes accounting methods For example, Geislinger used advanced accounting and accurate algorithms to greatly reduce the size of the structure and lower the price.

Structure of diaphragm coupling

     Diaphragm coupling structure: 4 holes 6 holes 8 holes 10 holes 12 holes
1. Diaphragm mode: consecutive polygonal ring, circular ring, separate connecting rod shape, spoke shape, formed diaphragm, wave diaphragm.
2. The characteristics of successive polygonal ring and circular ring: Each coupling is composed of several diaphragms of equal thickness. The outer edge of each piece is arc-shaped, which has better elasticity, simple shape, convenient processing, but poor elasticity. In addition, the elasticity with a small number of sides is better than the elasticity with a large number of sides, but if the number of sides is too small, the stability will also decrease. In one-way operation, only half of the ring side bears the transfer torque.
3. Features of separate connecting rod shape: Each diaphragm is composed of a single thin rod to form a polygon. The rod has a simple shape and is convenient to manufacture, but requires the pitch of each hole. Its operation function is basically the same as that of the continuous polygon ring, but the strength and speed are relatively higher. Low, suitable for occasions where the size of the coupling is restricted.
4. The characteristics of the spoke shape: Each coupling is composed of several pieces. The screw holes on the outer and inner edges are separated and connected with the driving and driven half couplings, which change during operation. The formed holes on the diaphragm are In order to add flexibility, the difference between the inner and outer diameters of the elastic demand should not be too small, and it is generally appropriate to transmit medium and small power.
5. Features of the formed diaphragm: Each coupling is composed of a single diaphragm. The thickness of the diaphragm is regularly reduced from the inner to the outer hyperbola to maintain equal strength conditions. The material utilization rate is high, and the overall performance is good. It is suitable for high-speed transmission, but the production precision of the diaphragm is higher.
6. The characteristics of the wavy diaphragm: The diaphragm is wavy in the axial section, with high elasticity and good compensation function.The single-piece hyperbolic type with equal thickness and unequal thickness of the diaphragm has better functions, and is now used more frequently.

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