Although China's aviation and aerospace industry as early as the end of 1950s began to study the application of strain type load sensor, but not to civilian development. On the whole, the development and production of the load sensor started late, in 60s, only a few manufacturers to produce ordinary precision strain sensor. The structure is single, only two kinds of cylindrical, ring structure, basic circuit compensation and adjustment, and some products even with external balance box to adjust the zero.
In early 80s, the country has more than 20 enterprises with capital of one hundred million yuan, with the exchange of $13 million, from the United States, Japan and other countries to introduce strain type load sensor manufacturing technology and equipment, learning, digestion, absorption. After imitation and trial production, the production of many varieties of small batch production, to the market, achieved considerable benefits. At that time, people summed up the product is: many varieties, small batch, low cost, high yield, less investment, quick results. Caused a lot of industry attention of individuals and businesses, have entered the industry, manufacturers from more than and 20 in 70s to a rapid increase of more than and 100, the annual output is equivalent to Japan, reaching only about 1000000.
With the development of the national economy, the industry demand for electronic scale increasing, greatly promoted the development of weighing sensor technology. From the middle of 80s to the middle of the 90s, it is the ten year that the development of the weighing sensor technology in our country has been developing steadily, the varieties and specifications are increasing rapidly, and the quality of products has been improved continuously. Many manufacturers have improved or increased process equipment, testing instruments, the acquisition of intelligent temperature compensation device and the sensitivity of temperature compensation equipment to achieve large-scale production. In the middle of 90s, the production of weighing sensor was increased to more than and 160, with an annual output of only about 2000000. In addition to meet the needs of the domestic market, more than a dozen companies began to export small quantities, showing a good momentum of development.
Although the weighing sensor is the legal measuring instruments of national compulsory management, should be more difficult to enter this industry, but due to various reasons lead to some enterprises and individuals to easily enter the market, causing congestion, increased competition in the market. Finally in the mid 90s outbreak of a price war, whose price is low, who is the big winner, and gradually upgrade intensified, has to zouhuorumo degree. The result of the price war is the slow progress of technology, the decline in the level of technology, quality problems, management oversight. The first victim is the vast number of users, the ultimate victim is the enterprise itself, is the entire weighing sensor industry. With these problems into twenty-first Century, the gap between the weighing sensor and the developed industrial countries not only did not shrink, but increased. In recent years, the results of national supervision sampling is an example.
2002 national supervision and inspection of 7 provinces and cities, 16 enterprises, a total of 48 weighing sensors, qualified 18, the passing rate of 37.5%. 30 substandard products from 10 companies, all of the reasons for poor performance is poor temperature. Even more serious is that in 16 companies, only one enterprise strictly enforce national standards. If the spot checks for a comprehensive inspection, the passing rate will be lower. The results of the national supervision and sampling test reflect the overall technology, technology and management level of the weighing sensor in china. The main reason for the low pass rate is: poor quality awareness, do not organize production in accordance with the law; the R60 international recommendations and national standards do not understand, do not perform, wrong turn 0.02 and grade C3 equivalent; in the interest driven by the change material, change element, reduction process, only barely qualified or qualified people.
In China, the main gap between the weighing sensor and the developed country is the market leading position:
(1) the structure type is less, varieties of incomplete specifications, special purpose products are scarce;
(2) the level of accuracy is low, and the success rate of C3 is not high;
(3) the poor stability and reliability, high repair rate, low working life;
(4) the standardization of products, the level of engineering and the degree of industrialization is low, and the homogeneity of product technical index is poor;
(5) although the appearance quality has improved, there is still a big gap;
(6) process equipment, detection means is not advanced and not complete, the production process of manual operation, manual control components, "workshop technology" traces of deep, human factors on product quality;
(7) innovative products and less independent intellectual property products, low-level products, OEM, direct exports less;
(8) there is no core competitive technology and products, market research is not enough, the market response is too slow, resulting in the integration with the international market.
In short, the manufacturing process is the largest gap, the manufacturing process is usually divided into:
Support the process of forging, machining, heat treatment and surface treatment;
The basic process is one of resistance strain gauge, strain adhesive, circuit compensation component and protective sealing material;
The core technology is one of the resistance strain gauge paste and solidification, zero point and sensitivity intelligent temperature compensation and protection and sealing, etc.;
Special process one by one heat treatment aging process and mechanical method.
Among them, the basic process and special process gap.
Household electronic scales (body scale, health scale, fat scale, kitchen scale, nutrition scale, treasure scale, pocket scale and portable scale etc.) with the weighing sensor and resistance strain gauge, since mid 90s, the R & D and production by all the countries in the world gradually moved to the Chinese, mainly in Guangdong, Shenzhen. In recent years, the design technology, manufacturing process and product yield have made astonishing rapid development. Production enterprises have three