The vibration sensor(Vibration Transmitter) is one of the key components in the testing technology of Vibration Measurement. Its main function is to receive the mechanical quantity and convert it into a proportional electric quantity. Because it is also an electromechanical conversion device. So we sometimes call it a transducer, a vibration pickup, etc.
Commonly used vibration sensors are as follows:
1. Piezoelectric resonant
The piezoelectric sheet is used to receive the vibration signal, and the resonance frequency of the piezoelectric sheet is relatively high. In order to reduce the resonance frequency, it is realized by increasing the mass of the piezoelectric sheet vibrating body, and using a spring ball instead of an appendage to reduce the two resonance frequencies and enhance the vibration effect. Its advantages are high sensitivity and simple structure. However, the signal needs to be amplified and sent to a TTL circuit or a single-chip microcomputer circuit, but it is enough to use a triode single-stage amplification
2. mechanical vibration
In the traditional vibration detection method, after being vibrated, the spring ball vibrates at a reduced amplitude for a long time, and this vibration is easy to be detected by the detection circuit. The vibration output switch signal is determined by the output impedance and the resistance value of the matching output. According to the input impedance of the detection circuit, it can be made into a high-impedance output mode.
3. Micro Vibration Sensor
The mechanical vibration sensor is miniaturized, the vibration body is carbonized and sealed, and its working performance is more reliable. The output switching signal is directly connected with the TTL circuit and or the input circuit of the single-chip microcomputer, and the circuit structure is simple. The output impedance is high, and the quiescent working current is small.
Advantages of Vibration Sensors
1. Small size and light weight. It can be applied to some vibration test systems that are greatly affected by the additional mass.
2. It has a wider response frequency range of 4Hz-2000Hz than the magnetoelectric speed sensor, and the mechanical moving parts are not easy to damage
If you have any questions about the vibration sensor, please contact us, we will provide you with professional and timely answers.
Vibration Sensor,Accelerometer Sensor,Velocity Sensor,Accelerometer Vibration Sensor Wuxi Winsun Automation Instrument Co., Ltd , https://www.winsunwx.com
The consumption of metalworking machine tools has experienced a three-step decline from 2015 to the highest level in 2015.
The first step is the relatively high level in 2011-2012, which is 390.9 and 38.28 billion US dollars respectively;
The second step was a significant decline in 2013-2014, at 319.1 and 31.83 billion US dollars respectively;
The third step is a small decline from 2015 to the present. In 2015, the consumption of machine tools was 27.5 billion US dollars. In the first half of 2016, it was 12.9 billion US dollars, down 9.2% year-on-year.
The production trend of metal processing machine tools is similar to the change in consumption, and it basically forms a three-step decline in synchronization with consumption. In the first half of 2016, the production of metal processing machine tools was US$10.4 billion, down 8.8% year-on-year. Although the import of metalworking machine tools has also declined, the third step is not obvious, mainly due to the gradual slowdown of imports in the later period.
In the first half of 2016, the import value of metal processing machine tools was US$4 billion, down 6.1% year-on-year.
The Chinese tool consumer market experienced a significant decline in 2015 after experiencing a slow-changing “turtle-back†growth. In 2015, the consumption of tools was US$4.5 billion, down 12.1% year-on-year. In the first half of 2016, the consumption of tools was US$1.9 billion, down 20.8% year-on-year. Among them, domestic machine tool sales in the first half of 2016 was only 86 billion yuan, falling for six consecutive years! The operating trend of national tool production is basically in line with the consumption. The main reason for the significant decline is that the demand for low-end cutting tools has shrunk dramatically. The fluctuation of tool imports was not large. In the first half of 2016, the import value of tools was 700 million U.S. dollars, down 6.2% year-on-year. This is related to the fact that import tools are mainly oriented to the mid-to-high end and the mid-to-high end demand remains relatively stable.
Despite a significant decline, China's machine tool consumer market is still the world's largest market, occupying an important position. According to global machine tool consumption and trade data, China's machine tool consumption ranked first in the world in 2015, accounting for 34.8% of all, 3.7 times that of the second US; in 2015, machine tool imports ranked first in the world. It accounted for 20.6% of the total, which is 1.9 times that of the second US. According to the relevant data estimates for the first half of this year, it is expected that the decline in China's machine tool consumption will further narrow this year, and will maintain its position as the world's largest market.
Significant structural changes
The prominent feature of the recent Chinese machine tool consumer market and industry is the obvious structural changes. The following is an analysis of structural changes from both the subdivision and the import.
Demand in emerging markets is rapidly increasing, and demand in traditional industries is sluggish. From the analysis of fixed assets investment data of the National Bureau of Statistics, in the first half of 2016, among the 30 sub-sectors of China's manufacturing industry, investment growth rate increased by 66.7%, and investment growth rate declined by 33.3%. The data at the end of 2015 were respectively 86.7% and 13.3%.
In terms of growth rate, the investment growth rate in the first half of 2016 in the double-digit segment is: culture, education, sports and entertainment products manufacturing (17.1%), food manufacturing (15.9%), textile industry (12.9%). ), electrical machinery and equipment manufacturing (12.3%), pharmaceutical manufacturing (11.7%).
In the first half of 2016, the investment declines in the double-digit segment were: metal products, machinery and equipment repair (-34.9%), tobacco products (-17.7%), and transportation equipment manufacturing (-11%). . In terms of investment, the top three are non-metallic mineral products ($113.1 billion), chemical products manufacturing ($99.9 billion), and general equipment manufacturing ($90.2 billion); the last three are tobacco products ( $1.3 billion), metal products, machinery and equipment repairs ($1.9 billion), and chemical fiber manufacturing ($8.1 billion).
Metal cutting machine tools have slowed down, and metal forming machines have not yet bottomed out. Regardless of market consumption or production data, the decline in metal cutting machine tools has narrowed recently. In the first half of 2016, the consumption of metal cutting machine tools was US$8.3 billion, down 3.5% year-on-year. Compared with the end of 2015, the growth rate rebounded by 10.9 percentage points; the consumption of metal forming machine tools was US$4.6 billion, down 17.9% year-on-year. Compared with the growth rate, the growth rate dropped by 5.6 percentage points.
In recent years, the structure of China's machine tool consumer market has accelerated, and the outstanding performance is that the demand for non-CNC machine tools is shrinking rapidly. As the segmentation of metal cutting machine tools has entered an early stage of adjustment, the adjustment has been carried out more fully, and the proportion of CNC products has been continuously improved, so it has begun to adapt to the current market demand structure. In contrast to the segmentation of metal forming machine tools, adjustments have just begun, and the rapid decline in non-CNC demand will inevitably drive down the market.
The decline in demand for low-end tools further reflects the under-employment of low-end manufacturing. In the first half of 2016, the import of cutting tools, cemented carbide blades increased by 2.8%, ordinary turning tools decreased by 10.9%; cemented carbide files increased by 12.9%, and ordinary files decreased by 13.1%; cemented carbide The drill bit decreased by 1.4% year-on-year, and the ordinary drill bit decreased by 9%. From 2015 to now, the sales of high-speed steel standard tools represented by high-speed steel drill bits, turning tools, milling cutters, etc. have dropped sharply, with a drop of about 30%, which echoes the trend of shrinking sales and use of non-CNC machine tools. Since tool consumption reflects the operating rate of manufacturing, the structural changes in tool consumption also indirectly reflect the structural changes in the use of equipment in manufacturing.
Changes in the source of imports, the top five sources of metal processing machine tools imported in the first half of 2016 were: Japan ($1.99 billion, -9.6%, share 30%), Germany ($1.08 billion, 4.8%, share 27.1%) ), Taiwan ($420 million, -17.4%, share of 10.5%), South Korea ($290 million, -17.3%, 7.2%), Switzerland ($220 million, -0.2%, 5.6%) . The top five import sources of cutting tools are: Japan (190 million US dollars, -6.7%, share 29.4%), Germany (120 million US dollars, -18.9% year-on-year, 19.5% share), Sweden (0.6 billion US dollars, 24.7% year-on-year) %, share 10.2%), Taiwan ($0.6 billion, -5.4%, share 9.9%), South Korea ($0.5 billion, 9.9% year-on-year, 8.3% share).
Changes in import structure, the top three imports of metal cutting machine tools in the first half of 2016 were: processing center ($1.5 billion, -7.3%, share of 45.9%), grinding machine ($5.5 billion, 9.2% year-on-year, share of 16.8) %), special processing machine tools ($420 million, year-on-year -10.2%, share of 12.8%). The top three metal forming machine tools are: punching and shearing machine tools ($310 million, -3.9%, share of 43.7%), forging machine tools ($190 million, -24.1%, share of 26.8%), presses ($100 million) , -38.8% year-on-year, 14.1% share). The top three cutting tools are: carbide inserts ($280 million, 2.8%, 40% share), drill/tapping tools ($130 million, -11.7%, 18.6%), milling cutters (0.9 billion) US dollar, -6% year-on-year, 12.9% share).
New challenges and new opportunities
As China's machine tool and tool consumer market shows a downward trend, there will always be people who care about China's economy and market to ask whether the engine of China's machine tool and tool consumer market is going to be turned off?
We feel that answering this question is far more complicated than asking this question, and it requires more rigorous attitude and in-depth analysis. Mainly because today's China's economy is very large, and the degree of market openness is also the highest in history. The factors involved in politics, economy, regional development, population, cultural habits, resources and environment, industrial system, capital and international relations are complicated, far from other small and medium-sized. The volume of the country is comparable, and it is not based on which genre economic theory and model can be analyzed clearly.
From the current development of China's current situation, combined with the government's policy orientation, this paper analyzes the new challenges and new opportunities that China's machine tool consumer market may face in the future.
In the analysis of the status quo of China's economic operation, it has been clearly pointed out that the downturn in recent years is mainly due to the impact of new and old kinetic energy conversion and structural upgrading of economic development. The machine tool products belong to the production materials. It is obviously impossible to be independent when the domestic user industry needs change and structural adjustment and upgrading, and it will definitely be directly or indirectly affected. In recent years, heavy machine tool manufacturers have experienced severe performance declines due to changes in energy and steel demand, which is the most typical example. It can be said that these incompatibility with changes in market demand and how to adapt to new market demands are new challenges that need to be faced in today's machine tool consumer market in China.
There is an old saying in China that "the old is not going, the new is not coming". As far as China's industrialization and consumption potential are concerned, these new challenges are born with more new opportunities.
First of all, China's industrialization has not yet been completed, and many basic links and equipment conditions are still weak, and there is huge room for growth. By comparing the industrialization development process of "Industry 4.0", only a very small number of Chinese industries are in the "Industry 4.0" stage, most of them are in the middle and early stage of "Industry 3.0", and even certain industries or enterprises are in the "industrial" 2.0" stage. This makes it understandable that in the past decade or so, there will always be about one-third of the Chinese market's consumption structure being non-CNC machine tools. This imbalance in industrial development means that the stable demand for machine tool consumption in the future may not be as large as the total in history, but the added value will certainly be higher than before.
Second, China is the world's largest manufacturing country, has established a complete industrial system, and has many high-quality laborers. These advantages will help Chinese manufacturing to serve both domestic and foreign markets in the future. As China is entering the stage of population aging, the quality and quantity of labor will show a downward trend. In order to make up for the shortage of labor and rising costs, the requirements for manufacturing equipment will continue to increase in efficiency, automation and intelligence. Some of the low-end machine tool stocks formed during the high-speed growth of investment in the past few years will be eliminated or modified in advance due to this increase, rather than waiting for their life to expire. We estimate that this part of the demand will form a certain degree of explosive growth with the changes in China's labor structure.
Finally, it is the energy-saving and environmental protection requirements that match the growth of China's economy and the improvement of international status, and the upgrading of the consumption level of machine tools brought by the development of emerging strategic industries. High-precision, high-efficiency, high-performance, automated and complex manufacturing demand solutions in manufacturing, such as medical, aerospace, defense, energy, transportation, and electronic information, with better unit energy productivity The sustainable development of China's economy and manufacturing.
As the saying goes, falling into the water does not necessarily drown, and staying in the water will be drowned. The positive changes in the Chinese market have provided a broad space for growth and innovation companies, including international machine tool manufacturers, and the challenge will be a souvenir for the winners.
In summary, we have reason to be confident in the long-term development of China's machine tool consumer market. 
Abstract In recent years, due to the slowdown of China's economic and investment growth and the upgrading of demand structure, the total scale of China's machine tool consumption market has shown a stage of decline. The following is a description of the changes in consumption, production and imports from the two main sub-product areas of metalworking machine tools and tools...
In recent years, due to the slowdown of China's economic and investment growth and the upgrading of demand structure, the total scale of China's machine tool and tool consumer market has shown a stage of decline. The following is a description of the changes in consumption, production and imports from the two main sub-product areas of metalworking machine tools and tools.