Tag: what is

An automatic screw feeder is an automatic device that replaces human hands to take, put and tighten the screws by automatic mechanism, which mainly applies for automatic assembly, such as producing car components, computers, display screens, motors, lamps and lanterns, mobile phones, printers, circuit boards and batteries. It can extremely improve production efficiency and reliability as well as reduce production costs. 

Automatic screw feeders are divided into the handheld automatic screw feeder and the fully automatic screw feeder. 

The principle of three-phase isolation transformer basically adopts the principle of electromagnetic induction. It is safe to use a three-phase isolation transformer, which is generally used as a maintenance power supply. The isolation transformer is commonly 1:1 transformer, but it has different specifications. Three-phase isolation transformers are used for changing voltage, lighting, power supply and rectifying power supply, widely applied to industrial and mining enterprises, power plants, airports, high-rise buildings, subways and other places with high fire safety requirements.

Isolation transformer is the transformer with electrical isolation between the input winding and the output winding. Isolation transformer is used to avoid users accidentally touching the charged body at the same time. Isolation transformer, whose transformer ratio is usually 1:1, is a special transformer with high insulation strength between the primary winding and secondary winding to isolate different potential to suppress common mode interference. The main function of the step-up & step-down isolation transformer is to completely insulate the primary side and the secondary side, and also to isolate the loop. In addition, the high frequency loss of the iron core is used to suppress the high frequency clutter into the control loop. 

Industrial water chiller is a kind of water cooling equipment, which can provide constant temperature, constant current and constant pressure. The principle of the chiller is to inject a certain amount of water into the internal water tank of the machine, cool the water through the cooling system of the chiller, and then the water pump inside the machine will inject the low-temperature frozen water into the equipment to be cooled, the frozen water will take away the heat inside the machine, and return the high-temperature hot water to the water tank again for cooling, so as to achieve the function of cooling the equipment by circulating and exchanging cooling.

What is the principle of the chemical element analysis instrument?
Chemical analysis instrument is mainly used for in-site measurement of elements in metal materials in the military industry, aerospace, iron and steel, petrochemical, power, pharmaceutical and other fields, it's an indispensable tool for rapid identification of materials in the industrial and military manufacturing fields accompanying the rise of the world economy.
Principle of chemical element analysis instrument.

What is the fiber optic sensor

Fiber optic sensor is a medium that transmits light waves by the principle of complete internal reflection of light, it consists of a core and cladding with a high refractive index. The refractive index of the cladding is smaller than that of the core, and its diameter is about 0.1mm～0.2mm. When the light penetrates into the fiber core through the end face and reaching the interface with the cladding, the light is reflected back to the fiber core due to the complete internal reflection of the light. After constant reflection, the light propagates along the fiber core and has only a slight attenuation. In actual detection process, the fiber optic sensor guides the light emitted by the transmitter to the detection point through light-guide fiber, and then guides the detected optical signal to the receiver through light-guide fiber, the detection is thereof realized. According to the different manner of execution, the fiber optic sensor can also be divided into various types, such as opposite type, diffuse reflectance type. Fiber optic sensor can detect objects in the far area. Due to the fiber loss and fiber dispersion, the intermediate amplifier shall be set at a proper position for long-distance fiber transmission system, so as to process and amplify the attenuated and distorted light pulse signals.

Three-phase imbalance means that inconsistent amplitude of three-phase current (or voltage) in electrical power system and that amplitude difference surpasses the specified range.
Unbalanced current of transformer refers to current difference of three-phase transformer windings. The current difference is mainly caused by different three-phase load. Asymmetry of load gives rise to asymmetry of three-phase current which flow through transformer. And current asymmetry causes asymmetry of three-phase impedance drop of transformer, thus three-phase voltage of secondary side is asymmetric, which will do harm to transformer and electric equipment.