aluminum coil annealing furnace of common problems and maintenance

Aluminum coil annealing furnace: analysis of its common problems, as well as the use of maintenance work!

Aluminum coil annealing furnace is widely used in modern industrial workshop, heat treatment process is very efficient because of it, and the operation is very simple, but if we encountered in operation when the annealing temperature reaches atmosphere, temperature, annealing furnace sealing, shielding gas pressure, and water vapor in the furnace and so on, we must learn to analyze these problems. In the article xiaobian for aluminum coil annealing furnace common problem analysis, and its maintenance work to give you a detailed introduction.

Analysis of common problems of aluminum coil annealing furnace:

1. Whether the annealing temperature reaches the specified temperature

Process is generally adopted solid solution heat treatment, that is, people commonly known as "annealing", the temperature range is 1040-1120℃. It can be observed through the observation hole that the stainless steel tube in the annealing zone should be in incandescent state, but no softening and sagging occurs.

2. Annealing atmosphere

Pure hydrogen is generally used as an annealing atmosphere, the atmosphere purity is 99.99% above, if the other part of the atmosphere is inert gas, purity can also be a little lower, but absolutely can not contain too much oxygen, water vapor.

3. Sealing of furnace

Aluminum coil annealing should be closed, isolated from the outside air; With hydrogen as a protective gas, only one vent is open. Check the method can be wiped with soapy water in each joint gap, to see if it is running gas; The places where air runs easily are the places where it enters the pipe and the places where it leaves the pipe. The sealing rings in this place are particularly easy to wear and should be checked and changed frequently.

4. Protective gas pressure

In order to prevent micro-leakage, the protective gas in the furnace should be kept at a certain positive pressure. If it is hydrogen protective gas, it is generally required to be above 20kBar.

5. Water vapor in the furnace

On the one hand, check whether the furnace material is dry, the first installation of the furnace, the furnace material must be dried; The second is whether the stainless steel tube into the furnace residual excessive water stains, especially if there is a hole above the pipe, do not leak into, or it will destroy the atmosphere of the furnace. If there are no such problems, the stainless steel tube that should have retreated about 20 meters after opening the furnace will start to shine, the kind of bright reflective.

Maintenance work of aluminum coil annealing furnace:

1, every week with compressed air or fan blowing clean, the circuit board with brush cleaning, blowing clean.

2. Clean the water channel of the machine with special descaling agent every 3-6 months. When the frequent water temperature of the machine alarms, it should be cleaned immediately when the water flow at the outlet is significantly reduced.

3. Strictly implement the principle of first supplying water and then energizing. Water shortage is strictly prohibited in the working process. In order to avoid blocking the cooling pipe, if water supply is provided by water pump, filter screen shall be installed at the water inlet of the pump. The cooling water temperature shall not be higher than 47℃, and the water flow rate shall be 10T/h. It is recommended to use softened water.

If the load rate is 100%, the water temperature of cooling water should be lower than 40℃, water circulation and softening water should be used. When the temperature is lower than 0℃, the circulating water in the aluminum coil annealing furnace should be discharged to prevent the pipeline from freezing crack.

4. The inductor and multi-turn inductor shall be kept clean to prevent short circuit between turns. The transformer contact surface and the inductor connection plate shall be clean and non-oxidized to ensure good electrical conductivity. When the sensor is replaced. After the heating is stopped, the transformer contact surface and sensor connection plate are polished with sandpaper to ensure good contact.

5, prevent electric shock, please ensure that the chassis according to the electrical code reliable grounding, water first, test the water pressure and whether there is leakage phenomenon. Power on again next, wait for panel DC voltmeter to display for 500V above, can open the panel power switch. Aluminum coil annealing furnace should avoid sunlight, moisture, dust, exposure to sunlight and rain, etc.