The development characteristics of electric screwdrivers in China (1) "negative growth" worthy of attention. In recent years, the output of electric tools in China has increased by an average of 41.5% per year. The single-phase electric wrenches who are also assembly tools are increasing at an annual rate of about 30%. On the contrary, the output of low-voltage DC screwdrivers is decreasing at a rate of about 25% per year, and the output of single-phase series screwdrivers fluctuates greatly. This phenomenon cannot be explained by the shrinking capacity of the domestic market. The fact is that in the past few years, the industries of home appliances, instruments, electrical appliances, etc. are developing, and the demand for electric screwdrivers is growing. The domestic market share of domestic electric screwdrivers is occupied by imported goods. We extracted and compiled the relevant figures from the 1994-1998 Power Tools Industry Statistics Annual Report. (2) Intense price competition. In the price war, China's electric screwdriver manufacturers are some military-to-civilian enterprises in the early stage. They use equipment, capital, tax incentives and other advantages to compete with the original production enterprises, so that each product is reduced from about 350 yuan to 250 yuan. The original production company lost most of its profits. In the later period, some township enterprises and individual enterprises, using their cheap labor and flexible promotion methods, lowered the price to about 10 yuan per unit, the lowest is about 80 yuan, so that some projects power tools string electric plate hand-chain electric Screwdriver low-voltage electric screwdriver Remarks 194 production (10,000 units) Statistics 71 2.4% of old companies no longer produce or reduce production. Take the Tianjin Machinery Tool Factory, which was the earliest manufacturer of low-voltage electric screwdrivers, as an example. In the early 1980s, it occupied the vast majority of the domestic market, with a maximum annual output of more than 20,000 units. By 1996, it only produced ro20 units, accounting for 12% of domestic production. Shopping malls such as the battlefield, the price war itself is beyond reproach. However, electric screwdriver products are prematurely invested in low-price competition, so that manufacturers have no spare time to improve process quality and develop new products. The low-grade products that have remained unchanged for 20 years cannot meet the technical requirements of more and more new generation of electromechanical products and their new standards for thread assembly, resulting in these markets being occupied by imported goods. (3) Technical research is stagnant and information is occluded. We have not been involved in the research of such products for many years and have not accumulated information on such products. Although some companies have imported some prototypes, they have no energy to organize the necessary analytical tests, let alone research innovation. (4) High-tech products are difficult to develop. The new high-precision electric screwdriver has been developed into a mechatronic product with a technical content far exceeding that of a general power tool. A prototype produced by Hitachi, including hollow shaft, plastic planetary gear, ceramic ejector, 7-slot 14-piece high-power permanent magnet motor, capacitive sensor, etc. It also includes 7 triodes, 2 silicon bidirectional switches, and 18 Various diodes and one PWM controller integrated circuit and a large number of control circuits composed of R, C, and 1. Analysis When the band switch is in 1 bit (14V) and 2 bits (16V) and w1>30%, the control box cannot work normally, that is, the motor is in the braking state and the control box does not cut off the motor power. Therefore, it can be seen that the parameters of the working head and the control box do not lose control functions at low pressure. The band switch is at 4 (2V) and larger, regardless of K, at H or at 1, W, the assembly torque measured at 10% or 50% is basically the same, that is, there is no obvious torque adjustment. The band switch has significant torque adjustment capability at 2 bits (16V) W1 <30% and at 3 bits (18V), but the dispersion is large. The relay is used to generate the braking effect. As described above, due to the delay and dispersion of the relay action, the braking effect is highly dispersed. In the actual measurement, it was found that when the vehicle was parked, the clutch did not have an impact, and there was an impact or even a second impact. In fact, each impact will increase the assembly torque, which will make the torque dispersion too large. We are a professional bathroom Faucet accessories manufacturer and supplier in China. 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