In recent years, with the development of the Internet of energy, the power and electrical equipment industries appear to be somewhat turbulent. The benefits of electrical product manufacturers are good and bad, and how the various fields conform to the development of the times. The transformation and upgrading of the electrical industry is not just about these. How can the electrical equipment industry grasp the new development trend?
Analysis of the development trend of the electrical industry:
One should develop high-end products and promote structural adjustment. Whether it is the domestic market or the foreign market, despite the fact that the demand level is still diversified, the demand for high-end products is becoming more apparent. In view of the overcapacity issue of the electrical industry in recent years, the industry is facing an urgent situation of structural adjustment and upgrading. Therefore, the electrical industry must take the market as the guide to promote the development of high-end products in order to achieve structural adjustment and transformation and upgrading.
As far as the power generation equipment industry is concerned, the country implements more stringent environmental protection standards and assessment systems, making the power generation equipment market further accelerate its development towards efficient clean energy and new energy; it is constrained by the effects of the operational effects of the power generation industry and the funds caused by the “triangular debtâ€. Tensions and other factors, the market demand is difficult to effectively release and other factors, and for many years the thermal power in China has always accounted for a large proportion of power generation equipment, resources and environmental pressures are increasing, thus both from the perspective of resource supply and environmental carrying capacity perspective Analysis, as the power generation equipment industry with large coal consumption, must accelerate the "transformation and upgrading, structural adjustment."
Through the investigation of power generation equipment and backbone enterprises of power transmission and transformation equipment, it has been found that the structural adjustments of the transmission and transmission equipment have undergone major changes. The first is that 600,000 kilowatts of high-power, high-parameter clean power generation equipment has become the main model. Since the beginning of production in 2006, a total of more than 300 units have been produced, of which nearly 100 units have been ordered to export 300MW or more subcritical, supercritical and ultra-supercritical units in India.
The second is that for the power transmission and transformation equipment industry, construction of UHV power grids, urban networks, and rural power grids have provided a broad market space for power transmission and transformation enterprises. “Intelligent†has become a normal requirement for power grid construction. The entire industry must face common problems such as serious overcapacity, continuous decline in product sales prices, and general decline in corporate profitability, strengthen innovation capabilities, and achieve structural adjustment and transformation and upgrading. It is necessary to change the "active innovation" of manufacturing products to follow the user's needs to actively guide the user's needs; from the single equipment manufacturing to the provision of transmission and transformation complete sets of equipment, and the transformation of the construction of transmission and transformation projects.
Proximity switch LJ18A3-8-J/EZ Product introduction:
Proximity switches are widely used in aerospace, aerospace, aerospace technology and industrial production. In daily life, such as automatic doors for hotels, restaurants, and garages, there are applications on automatic hot air blowers. In terms of security and anti-theft, such as data files, accounting, finance, museums, treasury and other places, are usually equipped with anti-theft devices composed of a variety of proximity switches. In measurement technology, such as length, position measurement; in the control technology, such as displacement, velocity, acceleration measurement and control, also use a large number of proximity switches
Detailed description:
The proximity switch is a position switch that can operate without mechanical contact with the moving part. When the object approaches the sensing surface of the switch to the action distance, the switch can be actuated without mechanical contact and exerting any pressure, thereby driving the DC electric apparatus. Or provide control instructions to a plc device. Proximity switch is a kind of switch type sensor (namely non-contact switch). It has both the characteristics of limit switch and micro switch, and it has the sensing performance, reliable operation, stable performance, fast frequency response, long service life, and anti-interference. Strong ability, and with waterproof, shockproof, corrosion-resistant and other characteristics. Products are inductive, capacitive, Hall, AC, DC type.
Proximity switch, also known as non-contact proximity switch, is an ideal electronic switch sensor. When the metal detector is close to the sensing area of ​​the switch, the switch can be contactless, no pressure, no spark, quickly send electrical instructions, accurately reflect the position and stroke of the moving mechanism, even if used for general stroke control, positioning accuracy, operation The frequency, the service life, the convenience of installation and adjustment, and the applicability to harsh environments cannot be compared with the general mechanical type of travel switch. It is widely used in machine tools, metallurgy, chemical, textile and printing industries. In the automatic control system can be used as limit, counting, positioning control and automatic protection links.
Proximity switch LJ18A3-8-J/EZ installation method:
1. When installing the proximity switch on the metal, reserve a certain space to prevent the switch from being interfered with by other metal than the detected object. The metal parallel to the sensing surface should be three times the sensing distance from the sensing surface; the metal around the switching axis should be centered on the axis close to the switch and three times the diameter of the cylinder close to the switch diameter.
2. When two or more proximity switches are installed at the same time, in order to prevent any interference between the two, the distance between the two sensing surfaces in the axial direction should be greater than five times the detection distance when the switches are opposite; The distance between them should be greater than three times the length of the switch. If the diameter of the switch is not equal, the diameter of the switch should be larger.
Selection test
Selection
For different material samples and different detection distances, different types of proximity switches should be selected so that they have a high performance-to-price ratio in the system. Therefore, the following principles should be followed in the selection:
1.1. When the detector is metallic, a high-frequency oscillatory proximity switch should be used. This type of proximity switch is most sensitive to iron-nickel and A3 steels.
For aluminum, brass and stainless steel samples, the detection sensitivity is low.
1.2. When the detector is non-metallic, such as wood, paper, plastic, glass, and water, capacitive proximity switches should be used.
1.3. Metals and non-metals For long distance detection and control, photoelectric proximity switches or ultrasonic proximity switches should be used.
1.4. When the detection body is metal, if the detection sensitivity is not high, an inexpensive magnetic proximity switch or Hall proximity switch can be selected.
Testing
2.1. Determination of operating distance; When the action piece is close to the sensing surface of the proximity switch, the proximity switching action distance is the maximum operating distance of the proximity switch. The measured data should be within the parameters of the product.
2.2. Determination of the release distance; When the action piece moves from the front side away from the sensing surface of the proximity switch and the switch changes from motion to release, the maximum distance the action piece leaves the sensing surface is determined.
2.3. Determination of hysteresis H; absolute value of the difference between the maximum movement distance and the release distance.
2.4. Determination of the operating frequency; use a speed-regulating motor to drive the bakelite disc, fix a number of steel pieces on the disc, adjust the distance between the switch sensing surface and the action piece, about 80% of the switching distance, and turn the disc. The action piece is close to the proximity switch. A speed measuring device is installed on the spindle of the disc. The output signal of the switch is shaped and connected to a digital frequency meter. Start the motor at this time, and gradually increase the speed. Under the condition that the product of the speed and the action piece is equal to the frequency count, the frequency of the switch can be read directly by the frequency meter.
2.5. Repeatability determination; The action piece is fixed on the measuring tool, and the motion speed is controlled to be 0.1 mm/s from the switch action area, which is 120% of the switching distance, from the front of the switch sensing surface close to the switch. When the switch is activated, read the reading on the gage and then exit the action zone to turn the switch off. Repeat this 10 times, and finally calculate the difference between the maximum and minimum values ​​of 10 measurements and the 10 average values, and the difference is the repeat accuracy error.
Wiring instructions
1. The three wires of the three-wire DC proximity switch are: brown wire---power anode blue wire---power cathode black wire---output signal
2. AC two-wire switch: connect the load and proximity switch in series and connect it to the AC power terminal.
Proximity switch LJ18A3-8-J/EZ picture
According to a report released by a design institute's participation in manual marking personnel, in 2017, the number of people who passed the power transmission and distribution and the distribution of electricity and the two certificates together was less than 100. After seeing such news, the first reaction was the registered electrical engineer. The affiliate price is going crazy. However, the pass rate is only one of the factors that dictate the price of a certificate. The price depends on the market demand and analyzes the relationship between supply and demand.
For the certificate affiliate market, the number of new registered electrical engineers to be affiliated next year is basically zero. Although the number of affiliates for power supply and distribution is somewhat high, under such a severe situation, it will be very difficult for registered electrical engineers to think about whether or not to increase the prices of power supply and connection ties next year.
As for the registered electrical engineer's price for the transmission of electricity, they are all currently in short supply, and the price is gradually picking up again. Therefore, it is expected that next year's launch of electricity transmission and linking prices will rebound. For those friends whose certificates are not yet affiliated, you can wait and see again.
When we look at the price trend of affiliated certificates, we must look at the overall situation in a comprehensive manner, and we must not consider the same people. At the same time, as an electrical practitioner, regardless of whether it is a business or a affiliation, regardless of the salary or the price of the affiliated, we have to register a registered electrical engineer. Certificates are very necessary.
In any case, the electrical industry is still expected to embark on the road. After all, this is a very important industry. There are too many places where electrical products are needed, so insist on what you think is right.
Wire harness & Cable assembly:The terminal wire in the electronic machine can effectively solve the problem of control and wire diameter of equipment installation. In addition, the installation operation is more convenient and safe. It is mainly reflected in that the secondary wiring is not easy to start, and other secondary wires may be touched during connection; if the primary connection wire diameter is small, the wire diameter is too large. For the cabinet with high segmentation degree, the bending radius is a problem, and the stress problem will occur, The switch may be damaged; in addition, the wire nose required by the installation specification may be greatly larger than the installation point of the component itself, and these terminal machines can effectively solve the problem.
Wire harness & Cable assembly
ShenZhen Antenk Electronics Co,Ltd , https://www.antenkcon.com