Innovative Design of Injection Mechanism of Injection Molding Machine Based on TRIZ Effect Theory

With the development of global economic integration, enterprises are facing unprecedented opportunities and challenges. Innovation has become an inevitable choice for enterprise survival, competition and development, and product innovation design is the most important link. Product innovation requires more interdisciplinary knowledge, more complex technical support, and better innovation theories. Innovative design is to conceive a new product working principle and find a new understanding of the market's target function with market competitiveness and actual realization possibilities. The former Soviet Union G.Saltshuller and a group of research staff, based on the analysis of 2.5 million patents in the world, pointed out that the topics and solutions in industry and natural science are recurring, and the technological evolution model is also recurring. Only one percent of the solutions are real inventions, while the rest are just a new way to apply previously existing knowledge or concepts. Therefore, for a new technical problem, the solution to the problem can be found from the existing principles and methods.

The theory of solving the problem of the invention TRIZ (TRIZ is a Russian abbreviation, its English translation is TheoryofInventiveProblemSolving, TIPS) was founded by the former Soviet Union Admiral Patent Office expert GSaltshulIer, which is a problem solving system based on the evolution of the technical system. The effect, the knowledge-based problem solving tool in TRIZ, is a specific scientific phenomenon for some reason, including physical effects, chemical effects, biological effects and geometric effects. They are composed of various scientific principles and are the basic scientific knowledge that constitutes knowledge in various fields. Scientific effects play an important role in design, and each effect may correspond to a solution to a design problem. For the same design problem, solving with different scientific effects may result in novel design. If the designer can flexibly use the basic knowledge of human beings and carry out the processes of recombination, superposition, association, synthesis, reasoning and abstraction, new ideas and new concepts can be formed to achieve the purpose of innovation.

2 process of inventing the level and effect of solving the problem

2.1 invention level

The solution to classify engineering topics by invention level is very useful and can generate many benefits. This classification method is the basis for innovative design scientific methodology. An important achievement of TRIZ is that the invention is of a level, and the product develops from a low-level to a high-level. Because of this development. Products have always occupied the old market or won new markets. G. S. Altshuller divides products or inventions into five levels through research, depending on the difficulty level of the topic, the source of knowledge, and so on.

According to the above invention level, Levels 1, 2 and 3 have shown that 95.7% of new product designs can be designed by analogy with existing products, that is, new products are only some improvement of existing products; Levels 4 and 5 Use existing effects and newly discovered effects.

2.2 Application effect process to solve the problem

The effect knowledge base is a collection of abstract functional modules and effects derived from a large number of patent analyses. These effects are all technical methods for achieving a particular function. Solve the innovative problems in mechanical design by using principles in the fields of physics, chemistry, biology and electronics; or solve the problems in process design through the relevant laws in the effect knowledge base. The process of establishing the effect knowledge base is based on solving the problem of the user's existence, and the general process of applying the effect to solve the problem.

When designing, the first task for the design staff is to find the problem, identify the problem, and abstract it into the basic topic, then perform system analysis, functional analysis, determine the requirements function, and establish the functional structure. According to the demand function, find the appropriate effects and examples from the effect knowledge base, then use the association and control methods to improve the existing functions, determine the original understanding of the problem, and test the original understanding, if the original understanding can not meet the demand function You should re-analyze the topic or choose other effects. The effect knowledge base contains a large number of physical, chemical and geometric effects, involving multiple fields of knowledge. It is the easiest tool to use in TRIZ. When analyzing a given topic, if the topic is clear but does not know how To solve this problem, it is necessary to apply the effect knowledge base to solve it. It can directly provide the designer with a large number of related effects, solve the existing problems, and eliminate the possible problems in the ultimate solution by combining with other TRIZ tools and concepts.

3Innovative design examples based on TRIZ effect

Injection molding machine (referred to as injection machine or injection molding machine) is the main molding equipment for making thermoplastic or thermosetting plastics into various shapes of plastic products by using molding die. It can be molded in one time, complex shape, accurate size or with metal inserts. The plastic material with dense texture, and the injection molding process has good adaptability to the processing of various plastics, high production capacity and easy automation. Therefore, the injection molding machine is widely used in the defense industry, transportation industry, building materials. , packaging, agriculture, science and education, and people's daily life in all areas. With the development of the national economy and the improvement of people's living standards, the demand for injection molded products in modern society is growing, and the requirements for injection technology are getting higher and higher. Ordinary hydraulic injection system, as shown in Figure 2. Because of the problems of high energy consumption, pollution, and low control precision, it is difficult to meet market requirements. Therefore, designing and manufacturing a new generation of “energy-saving and environment-friendly” injection molding machines has become an urgent need to pay attention to and solve problems.

3.1 topic analysis

Fundamentally, the energy-saving injection molding of injection molding machines, only innovative energy-saving injection molding technology, energy-saving power system and energy-saving actuators, all in one, in order to achieve full energy-saving performance. In recent years, with the development of injection molding machines, energy-saving technologies have made great progress, mainly in the development of energy-saving technologies on medium and small injection molding machines, development on power drive systems, lack of energy-saving injection molding principles and energy-saving actuators. Innovative development. Therefore, from the perspective of the principle of energy-saving injection molding and energy-saving actuators, the injection molding mechanism of the injection molding machine is innovatively designed by using the effect theory in TRIZ to achieve the purpose of energy saving. According to the actual production and operation, the hydraulic system and injection mechanism of the injection molding machine mainly have the following problems:

(1) The oil flow rate and pressure required by the injection molding machine under different processes must be adjusted by the flow valve and the pressure valve. Since the metering pump cannot adjust the output power, the excess energy can only leak in the baffle and oil circuit. It aggravates the wear of various valves, causing excessive oil temperature, excessive motor noise, and shortened mechanical life.

(2) Due to the large resistance loss and leakage of oil activity, the system energy consumption efficiency is low. If not handled properly, the leak not only contaminates the site, but may also cause fire and explosion.

(3) The oil in the hydraulic system is polluted or mixed into the air, which easily causes creep, vibration and noise, which affects the working performance of the injection molding machine.

3.2 System function analysis