Type of soldering iron
First, the type of electric iron
External thermal soldering iron
It consists of a soldering iron head, a soldering iron core, a casing, a wooden handle, a power lead, and a plug. Since the tip is mounted inside the iron core, it is called an external heating type soldering iron.
The iron core is a key component of the electric iron. It is formed by winding the heating wire in parallel on a hollow ceramic tube. The mica sheet in the middle is insulated, and two wires are connected to the 220V AC power supply.
There are many specifications for external thermal soldering irons, such as 25W, 45W, 75W, 100W, etc. The higher the power, the higher the temperature of the soldering iron.
The power quality of the soldering iron core is different, and the internal resistance is also different. The resistance of the 25W soldering iron is about 2k Ω, the resistance of the 45W soldering iron is about 1 k Ω, the resistance of the 75W soldering iron is about 0.6 k Ω, and the resistance of the 100W soldering iron is about 0.5 k Ω.
The soldering iron tip is made of copper material. Its function is to store heat and conduct heat. Its temperature must be much higher than the temperature to be soldered. The temperature of the soldering iron has a certain relationship with the size, shape and length of the soldering iron. When the size of the tip is relatively large, the hold time is longer. In addition, in order to meet the requirements of different welds, the shape of the tip is different, and the common ones are tapered, chiseled, round beveled, and the like.
2. Internal heating soldering iron
It consists of a handle, a connecting rod, a spring clip, a soldering iron core, and a soldering iron tip. Since the iron core is installed inside the soldering iron tip, the heat is fast and the heat utilization rate is high, so it is called an internal heat type soldering iron.
Common specifications for internal thermal soldering irons are 20W and 50W. Due to its high thermal efficiency, the 20W internal thermal soldering iron is equivalent to an external thermal soldering iron of about 40W.
The rear end of the internal heat type soldering iron is hollow, and is sleeved on the connecting rod and fixed by the spring clip. When the soldering iron head needs to be replaced, the spring clip must be first removed, and the front end of the soldering iron head is clamped with the pliers. Pull out slowly, remember not to use too much force to avoid damaging the connecting rod.
The iron core of the internal heating type soldering iron is made of a relatively thin nickel-chromium electric resistance wire wound on a porcelain tube, and its electric resistance is about 2.5 k Ω (20 W), and the temperature of the soldering iron is generally about 350 OC.
Since the internal heating type soldering iron has the characteristics of quick heating, light weight, low power consumption, small volume, and high thermal efficiency, it has been applied in general.
3. Thermostatic soldering iron
Since the temperature control electric iron head is equipped with a magnet type temperature controller to control the energization time to achieve temperature control, when the electric iron is energized, the temperature of the soldering iron rises, and when the predetermined temperature is reached, the strong magnet sensor reaches Curie point and magnetic disappearance, so that the core contact is disconnected, then the power supply to the soldering iron is stopped; when the temperature is lower than the Curie point of the strong magnet sensor, the strong magnet recovers the magnetic force and sucks the magnetic core switch The permanent magnet in the middle makes the contact of the control switch turned on and continues to supply power to the soldering iron. In this way, the purpose of controlling the temperature is achieved.
4. Tin soldering iron
The tin-plated soldering iron is a desoldering tool that dissolves the piston type soldering device and the soldering iron. It is easy to use, flexible, and has a wide range of applications. The disadvantage of this tin soldering iron is that only one solder joint can be desoldered at a time.
Electric Fan referred to as fan, also known as fan, fan fan, is a motor-driven fan rotation, to achieve the air to speed up the flow of household appliances, mainly for cool Jieshu and circulation of air. Widely used in homes, classrooms, offices, shops, hospitals and hotels and other places.
The fan is mainly composed of fan head, fan blade, net cover and control device and other components. Fan includes motor, front and rear cover and shaking head blowing mechanism. The main components of the fan are: AC motor. Its working principle is: power coil in the magnetic field in the force and rotation. Electric energy into mechanical energy, and because of the coil resistance, so inevitably part of the energy to be converted into heat.
Common household fans are essentially axial fans, that is, the flow of wind parallel to the fan axis of rotation.
Electric Fan
Portable Fan, Electric Cooling Fans, Electric Stand Fan, Electric Wall Fan
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