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Ultrasound flaw detection is a method to inspect the defect of a part by means of the reflection characteristics of the interface edge when the ultrasonic energy penetrates into the depth of the metal material and one section enters another section. When the ultrasonic beam passes from the surface of the part to the inside of the metal from the probe, the reflected waves will occur separately when the defect and the bottom of the part are encountered. Pulse waveforms are formed on the fluorescent screen, and the position and size of defects are judged according to these pulse waveforms. Eddy current detection is to use the principle of electromagnetic induction to excite the probe coil with the sinusoidal current. When the probe approaches the metal surface, the alternating magnetic field around the coil generates induced current on the metal surface. For flat metal, the flow direction of the induced current is a circle with concentric coils, similar to a vortex, called eddy current. At the same time, the eddy current also produces the same frequency magnetic field, which is opposite to the coil magnetic field.

The loss resistance of the eddy current channel and the reverse flux produced by the eddy current are reflected in the probe coil, which changes the current size and phase of the coil, that is, the impedance of the coil. Therefore, when the probe moves on the metal surface and encounters defects or changes in material and size, the eddy current magnetic field reacts differently to the coil, causing the coil impedance to change. By measuring the variation with the eddy current testing instrument, the defect on the metal surface or other changes in physical properties can be identified.

There are many factors affecting the eddy current field, such as the coupling degree between the probe coil and the tested material, the shape and size of the material, conductivity, permeability, and defects, etc. Therefore, the eddy current principle can be used to solve the problems of metal material flaw detection, thickness measurement and sorting.

We did eddy current vs ultrasonic testing,eddy current testing and we mastered ultrasonic flaw detector theory,ultrasonic flaw detector working principle and pulsed eddy current principle,so our products like ndt machine,which can be guaranteed.

The basic working principle of eddy current testing instrument is as follows:

When the test coil with alternating current is close to the conductor workpiece, the alternating magnetic field generated by the coil will cause the conductor to generate current (eddy current). The size, phase and flow pattern of eddy current are affected by workpiece properties (conductivity, permeability, shape, size) and defects. The voltage and impedance of coil are changed by the reaction of magnetic field.

Therefore, the change of voltage or impedance of the test coil can be measured by the instrument, and the nature, state and defect of the workpiece can be judged.

Characteristics of Eddy Current Testing Instrument

1. Scope of application of eddy current testing instruments

(a) Process inspection and final product inspection: quality control during manufacturing process or rejection of non-conforming products in finished products.

1. b) In-service inspection: periodic inspection for mechanical parts and heat exchange pipes and other facilities.

1. c) Other applications: thickness measurement of metal sheets and coatings, material sorting, conductivity measurement, etc.

2. Advantages of Eddy Current Testing Instruments

(a) No contact with the workpiece and no coupling agent are needed in the detection, which can be carried out at high temperature. At the same time, the probe can be extended to remote detection, which can effectively detect the narrow area and deep hole wall of the workpiece.

1. b) The detection sensitivity of surface and near surface defects is very high.

1. c) It is easy to realize high-speed and high-efficiency automatic detection for the detection of tubes, rods and wires. It can digitally process the test results, and then store, reproduce and process the data.

BKN is one of the professional ndt equipment manufacturers,we master the eddy current testing principle,we also produce ndt testing machine,we will be your best partner.

Use and classification of corner shearing machine  . The shearing machine is mainly used in cutting the straight edge of various sizes of sheet metal and is widely used in cars, planes, steel rolling, tractors, ships, Bridges, electric appliance, instrumentation, boiler, pressure vessel and other industries.

There are many kinds of shearing machine. According to shearing machine function, shearing machine working principle and structure, they can be divided into:

First, the Flat blade shearing machine.

It features superior quality, small deformation but large energy consumption. And the two blades are parallel to each other. It is often used in the hot shearing of the Square bloom and the slab in plants.

Second, inclined blade shearing machine.

The upper and lower blade of the shearing machine form an Angle, and the upper blade inclines 1 ° ~ 6 °. The shearing force of the inclined blade shears is smaller than that of the flat blade shearing machine, so the power of the motor and the weight of the whole machine is smaller. It is commonly seen in the practical application. This kind of shearing machine is divided into guillotine shearing machine and pendulum sheet shearing machine according to the motion of the tool holder. And according to the main drive system, it can be divided into two types: mechanical transmission and hydraulic transmission shearing machine.

Third, Multi-purpose shearing machine:

The sheet bending and shearing machine can complete the cutting and bending process on the same machine, which is convenient and practical. Combined punching and shearing machine can be used for cutting of sheets and proximate matter, most of which occur in the laying-off process.

Forth, Special shearing machine:

Sheet flat line shearing machine is used in sheet coil straightening lines. The high-speed shearing machine is designed to cooperate with fast shear requirements. On the thick sheet shearing line, there is mostly hydraulic high-speed shearing machine. While on the thin sheet line, there is mostly pneumatic guillotine shearing machine. And on the high-speed line, there is flying shear, which can work continuously and brings high production efficiency. Steel structure production line shears are mostly used in Angle steel and H section automatic production line to complete the cutting process. Cold bending molding line shears, such as the cold bending line of automobile longitudinal beam, the production line of the side baffle of the car, the molding line of color steel sheet and other special shearing machines.

If you want to know the types of shearing machine, please contact us. We will give you book of shearing machine safety precautions.

BLKMA is a company from China. Founded in 1994, it is located in Ma'anshan, Anhui Province, China. It is only 26 kilometers away from Nanjing Lukou International Airport. It has the developed transportation system so that our customers can visit at any time. In the pipeline processing machinery industry in China, BLKMA is the most authoritative modern enterprise, which participated in the national Chinese pipeline machinery industry standards. In recent years, it maintains a rapid growth in sales revenue and enterprise scale according to the technological innovation and the continuous development of global markets.

BLKMA Auto duct line And Spiral duct machine delievery to Australia

The order of Duct marking machine from an Australian customer was completed and shipped to Brisbane, Australia, after rigorous factory testing.

Solar Hybrid Air Conditioner Working Principle

Cooling capacity 9000BTU/12000BTU/18000BTU/24000BTUInside building digital calculator to priority biggest using DC power, auto balance 220V city grid power.  DC input range is DC50V~DC300V,  so can connect max around 1500W solar PV panel Max consumption 90% solar DC power.

This solar thermal hybrid air conditioner no need battery, install take small place, so for the end user whole system running cost is very low.Meanwhile,the hybrid air conditioner price is affordable,welcome to buy.

When night, it can same as normal inverter air conditioner by city power 220V.

ACDC On-grid solar split air conditioner wall split type, the power from solar panel priority supply directly to indoor&outdoor fan motor and compressor. When the solar power is not sufficient, by equipped with dual PV MPPT tracking system, the system automatically switches to run by grid power, thus achieved the AC/DC power supply interaction, and uninterrupted supply power to air conditioner, ensure the system high efficiency up to SEER36, high quality with 3-5 years warranty, convenient installation, wide voltage design, free combination of solar panels.

The air conditioner directly connects solar PV panel to AC unit by MC4 solar connectors, others like normal split acdc aircon.

The greatest advantage of solar thermal hybrid air conditioner is that people need cooling most when the sun is the heaviest, and the more the solar energy is, the easier collecting a lot of energy and make use of will be.

How can big room your hybrid ac unit heat/cool?

9000btu up to 18 sq.mt

12000btu up to 23 sq.mt

18000btu up to 35 sq.mt

24000btu up to 47 sq.mt

How many solar panels do I need to run your ACDC unit?

ACDC09-----solar PV panel 200W*4PCS

ACDC12-----solar PV panel 250W*4PCS

ACDC18-----solar PV panel 300W*4PCS

ACDC24-----solar PV panel 300W*5PCS

(SUNCHI GROUP) Jiangsu Sunchi New Energy Co., Ltd. is a scientific and technological innovation-oriented enterprise which is specially engaged in researching, developing, manufacturing and marketing of solar air-conditioner, heat pump and solar water heater. For years, SUNCHI take the concept and objective of 'quality first, service superior' and 'sincere cooperation, green civilization'. Meanwhile, SUNCHI execute ISO9001:2000 strictly and the products have passed many authorized attestations such as: ISO9001:2008, CE, CCC, TUV and SGS. SUNCHI is located in Danyang City Jiangsu Province with convenient transportation and covers an area of over 50,000㎡, and has over 500 employees with annual productivity of 180,000 sets. Take the quality as foundation and client's satisfaction as our aim, keep development and innovation ,work hard in the field of green, safe and energy saving solar energy, and build a brilliant future with you together.

Electromagnetic detection is a very important non-destructive testing method and is widely used. Magnetic flux leakage testing is a magnetic method of nondestructive testing that is used to detect corrosion and pitting in steel structures, most commonly pipelines and storage tanks. The basic magnetic flux leakage principle is used to magnetize the steel. When used in combination with other methods, it provides a quick and inexpensive assessment of the workpiece of ferromagnetic materials. With the advancement of technology, people are paying more and more attention to the automation of the inspection process. This not only reduces the labor intensity of the inspection work but also improves the reliability of the test results and reduces the influence of human factors. The MFI magnetic flux leakage inspection method is a highly automated magnetic detection technology. The principle is that after the ferromagnetic material is magnetized, the surface and near-surface defects form a leakage magnetic field on the surface of the material, and defects are detected by detecting the leakage magnetic field. In this sense, the magnetic particle detection technology commonly used in pressure vessel inspection. However, it is customary to use the method of measuring the leakage flux with a sensor as the magnetic flux leakage detection, and the magnetic flux to detect the leakage flux. The method is called magnetic particle detection and they are juxtaposed into two detection methods.

Magnetic flux leakage testing can only detect surface and near-surface crack defects, and it needs surface grinding when testing. It is only suitable for the detection of workpiece discontinuation. In addition to the surface and near-surface crack defects, the MFI magnetic flux leakage inspection can also find the corrosion inside the workpiece from the outside. Defects such as pits, and do not need to be polished on the surface of the workpiece, suitable for on-line inspection of workpieces. On-line inspection of workpieces is currently the most urgent method for users, which can reduce unnecessary parking and reduce inspection costs. In addition, the magnetic flux leakage detection can also quantify the depth and length of defects. Although the application of magnetic flux leakage detection technology is rarely used in workpiece inspection, it has the advantages that magnetic particle detection does not have, so its application prospect is very broad.

Nanjing BOKENA Automation System Co., Ltd., originated from the eddy current testing laboratory of the Nanjing University of Technology. It is one of the most professional ndt testing equipment suppliers in China. We sincerely invite and welcome people from all around the world to invest and create more values together.

The differential pressure control valve working principle Balance valve is a dynamic and static balancing valve under hydraulic conditions. Such as static balance valve, dynamic balance valve.
Valve body material: cast iron, cast steel,
Work pressure is 0.6-4.0 MPA.
The working temperature is - 5 C - 350 C.
Valve caliber DN15-DN300,
Connection mode: flange, internal thread,

Manufacturing standard: national standard.

How does a balancing valve work?
Balancing valve is a special function valve. It has good flow characteristics. Besides, it has valve opening index, opening locking device and pressure measuring valve for flow measurement. By using special intelligent instrument, the flow value flowing through the balance valve can be directly displayed by inputting the valve type and opening value according to the measured pressure difference signal. As long as the balance valve with appropriate specifications is installed in each branch and user's entrance and debugged once with the special intelligent instrument, the flow rate of each user can reach the set value.
Static balancing valves are also called balancing valves, manual balancing valves, digital locking balancing valves, double-position regulating valves, etc. It is through changing the clearance between the spool and the seat (opening), to change the flow resistance through the valve in order to achieve the purpose of regulating flow. Its object of action is the resistance of the system, which can distribute the new water in proportion to the design calculation, increase and decrease the branches in proportion at the same time, still meet the flow demand of part of the load under the current climate needs, and play the role of heat balance. Dynamic balancing valves are divided into dynamic flow balancing valves, dynamic differential pressure balancing valves, self-operated differential pressure control valves and so on.
Dynamic flow balance valve is also called self-operated flow control valve, self-operated balance valve, constant flow valve, automatic balance valve, etc. It automatically changes the drag coefficient according to the change of system working condition (differential pressure). In a certain range of pressure difference, the flow through can be effectively controlled to maintain a constant value, that is, when the pressure difference before and after the valve increases, the flow through the valve can be maintained by the action of automatic closing small. On the contrary, when the pressure difference decreases, the valve opens automatically and the flow rate remains constant. However, when the pressure difference is smaller or larger than the normal working range of the valve, it can not provide additional pressure head after all. At this time, the flow rate of the valve to the full open or closed position is still lower or higher than the set flow rate can not be controlled.
Dynamic differential pressure balancing valve, also known as self-operated differential pressure control valve, differential pressure controller, constant voltage variable synchronizer, differential pressure balancing valve, etc. It uses differential pressure to adjust the opening of the valve, and uses the change of pressure drop of the valve core to compensate for the change of pipeline resistance, so as to keep the differential pressure basically unchanged when the working condition changes. The valve working principle is that in a certain flow range, it can effectively control the constant pressure difference of the controlled system, that is, when the pressure difference of the system increases, it can ensure that the pressure difference of the controlled system increases by automatically closing the valve. When the pressure difference decreases, the valve opens automatically, and the pressure difference remains constant. The self-operated pressure difference control valve has an automatic plug closing state within the control range. The pressure difference between the two ends of the valve exceeds the preset value. The plug opens automatically and adjusts the opening automatically under the action of the pressure sensitive film to keep the pressure difference between the two ends of the valve relatively constant.

ZECO is one of the most professional control valve manufacturers china and we have been devoted to produce control valve china for many years. If you want to know more details or want a quotation, just feel free to contact us!

Double regulating valve working principle

Balance valve is a dynamic and static balancing valve under hydraulic conditions. Such as static balance valve, dynamic balance valve.

Valve body material: cast iron, cast steel,

Work pressure is 0.6-4.0 MPA.

The working temperature is - 5 C - 350 C.

Valve caliber DN15-DN300,

Connection mode: flange, internal thread,

Driving mode: manual and electric.

Manufacturing standard: national standard.

Balancing valve is a special function valve. It has good flow characteristics. Besides, it has valve opening index, opening locking device and pressure measuring valve for flow measurement. By using special intelligent instrument, the flow value flowing through the balance valve can be directly displayed by inputting the valve type and opening value according to the measured pressure difference signal. As long as the balance valve with appropriate specifications is installed in each branch and user's entrance and debugged once with the special intelligent instrument, the flow rate of each user can reach the set value.

Static balancing valves are also called balancing valves, manual balancing valves, digital locking balancing valves, double-position regulating valves, etc. It is through changing the clearance between the spool and the seat (opening), to change the flow resistance through the valve in order to achieve the purpose of regulating flow. Its object of action is the resistance of the system, which can distribute the new water in proportion to the design calculation, increase and decrease the branches in proportion at the same time, still meet the flow demand of part of the load under the current climate needs, and play the role of heat balance. Dynamic balancing valves are divided into dynamic flow balancing valves, dynamic differential pressure balancing valves, self-operated differential pressure control valves and so on.

Dynamic flow balance valve is also called self-operated flow control valve, self-operated balance valve, constant flow valve, automatic balance valve, etc. It automatically changes the drag coefficient according to the change of system working condition (differential pressure). In a certain range of pressure difference, the flow through can be effectively controlled to maintain a constant value, that is, when the pressure difference before and after the valve increases, the flow through the valve can be maintained by the action of automatic closing small. On the contrary, when the pressure difference decreases, the valve opens automatically and the flow rate remains constant. However, when the pressure difference is smaller or larger than the normal working range of the valve, it can not provide additional pressure head after all. At this time, the flow rate of the valve to the full open or closed position is still lower or higher than the set flow rate can not be controlled.

Dynamic differential pressure balancing valve, also known as self-operated differential pressure control valve, differential pressure controller, constant voltage variable synchronizer, differential pressure balancing valve, etc. It uses differential pressure to adjust the opening of the valve, and uses the change of pressure drop of the valve core to compensate for the change of pipeline resistance, so as to keep the differential pressure basically unchanged when the working condition changes. Its principle is that in a certain flow range, it can effectively control the constant pressure difference of the controlled system, that is, when the pressure difference of the system increases, it can ensure that the pressure difference of the controlled system increases by automatically closing the valve. When the pressure difference decreases, the valve opens automatically, and the pressure difference remains constant. The self-operated pressure difference control valve has an automatic plug closing state within the control range. The pressure difference between the two ends of the valve exceeds the preset value. The plug opens automatically and adjusts the opening automatically under the action of the pressure sensitive film to keep the pressure difference between the two ends of the valve relatively constant.