Method of fritting and polymerization in the furnace of the powder coatings

FIELD: many branches of industry; methods of fritting and polymerization in the furnace of the powder coatings.

SUBSTANCE: the invention is pertaining to the method of heating and fritting of the polymeric powder coatings applied on articles and may be used in many branches of industry for painting articles of the various configurations. The method includes: charging by batches of the articles in the furnace, heating with realization of polymerization of their powdery coatings and refrigeration. Before the heating operation in the working space of the furnace create rarefaction by means of preliminary switching on the ventilation and circulation system. After the heating up to the preset temperature conduct the periodical switching-on / switching-off of the electric heater of the furnace. At that the blowout of the air from the furnace is conducted. For keeping the preset temperature over the whole operational volume of the furnace through at least one pilot hole in the furnace the portions of the cold air are periodically pumped in. Then conduct refrigeration, at which the electric heater is finally switched off, and the air saturated with the products of polymerization is removed from the furnace, create the rarefaction and feed the new batch of the cold air into the furnace. For realization of the heating they use the electric heater made out of the steel sheets and the square-shaped metallic tubes. The tubes have holes used for arrangement in them of the tubular rods supporting the spirals. The tubular rods supporting the spirals of the electric heater are made out of the mullitesiliceous ceramics. The technical result of the invention is improvement of the quality of the articles treated in the furnace with simultaneous improvement of the process of heating of the furnace, the air ventilation and circulation.

EFFECT: the invention ensures improvement of the quality of the articles treated in the furnace at simultaneous improvement of the process of heating of the furnace, the air ventilation and circulation.

8 cl, 3 dwg, 1 ex

 

Proposed for protection by the Russian Federation patent for an invention is a technical solution relates to a method of heating and melting applied to products of polymer powder coatings and can be used in all industries for dyeing products of various configurations.

The prior art is well known similar methods.

For example, the known method of polymerization (see patent RU 2002183 C1, F 27 B 1/09, F 27 D 7/04, 30.10.1993) [1], according to which before the beginning of the polymerization process for 40-45 minutes include craft supply and exhaust ventilation, heating elements, and setting in motion for uniform heating of the conveyor. After the device temperature, which is automatically supported by the sensor on the plate of the upper horizontal section of the conveyor stack aluminum tubes coated with a polymeric material. Together with the conveyor tube through the download window comes to the heating chamber in the area of pre-drying, where the lacquer is dried at 120-130°C for 2 min. at the same time, is a window allowing fresh air that is heated by electric heaters. In the convective-radiative heat transfer tubes are heated to a predetermined temperature

Also in the prior art, foreign patent documents the purpose disclosed methods of melting and polymerization of powder materials:

- "Method of heat treating articles and oven therefore" (see the description of the patent US 5868565, F 27 9/02, 09.02.1999 [2],

- "Closed loop, inert atmosphere, paint line oven heat source" (see the description of the patent US 3787171, F 27 9/28, 29.01.1974) [3].

According to each of the mentioned methods [2 and 3] the product is loaded into the furnace, include heating systems and ventilation and circulation.

Closest to the claimed technical solution is a method of melting and polymerization in an oven powder polymer coatings, according to which the products are loaded into the furnace, include heating systems and ventilation and circulation (see the description of the patent specification EN 9294 U1, 16.02.1999) [4].

Common faults for all of the above analogues are:

- uneven temperature distribution in the furnace due to the not quite exact location of the heating furnace and ventilation and circulation, as well as their constructive execution

- a small number (up to 30%) of the total volume of the furnace with a uniform operating temperature, owing to the presence in the working space of the furnace zones overheating and podstugivaniya, which negatively affects the quality of manufactured products, because in such conditions, the polymerization process over the entire area of the workpiece is uneven,

- yellowing paints applied to products due to education during operation of the furnace gaseous products of polymerization,

- low environmental the traveler security, as the polymerization products, during operation of the furnace, through various technological holes, including cracks, proceed to the shop, which adversely affects the health of staff.

The task, which directed the claimed technical solution is the development of a fundamentally new method of melting and polymerization in an oven powder coating, which can eliminate the above disadvantages inherent in similar ways.

The technical result of the claimed solution is to improve the quality of the processed in the furnace products, with simultaneous improvement of furnace heating, ventilation and circulation.

This problem is solved due to the fact that in the method of melting and polymerization in an oven powder coatings, including loading of items into the furnace, heating to the implementation of the polymerization of the coating and cooling, according to the claimed technical solution before heating in the working space of the furnace creates a vacuum through the provisional inclusion of ventilation and circulation, after heating to a predetermined temperature, produce periodic stopping and starting of the electric furnace, thus shall exhaust air from the furnace through the outlet of the centrifugal fan circulation system and ventilation by the periodic switching regulating valve fan, to maintain a constant temperature throughout the working volume of the furnace through at least one production hole in the furnace periodically submit a new batch of cold air, then carry out cooling, in which the heater completely off, and saturated with products of the polymerization of the air is removed from the oven, creating a depression and served in the oven a new batch of cold air.

In addition, for the implementation of heating using the heater made of steel plates and rectangular metal tubing made with holes for placement is made in the form of tubes supporting the spiral rod and the supporting spiral heater rods are made mulitocrementerrestrial ceramics.

In addition, use the heater with spiral from fehrle.

In addition, use the heater with the retainer plate.

In addition, use the heater with the cold end, made in the form of a rod.

In addition, use of the heater, spiral which is the core of the cold end is connected by welding with tokoyoda plate.

In addition, use a fan with control valve in the form of a metal plate, attached to the axis.

In addition, the regulating valve fan sets with in what zmoznostjo fixation in various positions.

Below is a description of the presented graphics of one of the embodiments of the claimed technical solution is in no way limiting all possible ways of its implementation.

Figure 1 - schematic representation of the furnace polymerization, in which the claimed method, figure 2 - schematic representation of the centrifugal fan, figure 3 - schematic representation of the heater.

Figure 1 presents:

1 - building an oven,

11, 12, 13, 14section high temperature sandwich panels (made of basalt),

2 - heater

3 - centrifugal fan,

Figure 2 presents:

5 - the main shell of the fan housing,

6 - inlet pipe fan header,

7 - fan impeller,

8 - the first outlet of the fan.

9, the second outlet of the fan,

10 - additional wall fan,

11 - additional shell fan, designed as a continuation of the main shell (5) of the fan housing,

12 - regulating valve fan,

13 - the axis on which is fixed a valve fan,

141- the relative position (A) valve fan, wherein the fan operating mode "ventilation",

142- conditional is ulozhenie (In) valve fan when the fan is running at full removal of air masses from the working space of the furnace.

Figure 3 presents:

15 - main frame of the electric heater

16 - steel plate,

17 - spiral

18 is a rectangular metal tube,

19 - hole,

20 supporting rods

21 - locking plate

22 - current terminals,

23 - tokoyoda plate,

24 wall oven.

Below is one of the possible examples of implementation of the claimed method does not restrict all possible variations in its implementation.

The use of the inventive method the electric heater in the form described above, including through the use in the manufacture of spirals of fehrle, allows to use it in open mode, i.e. when the spiral is not covered by any devices (e.g., cover, warm-up which also takes energy) to ensure the longevity of their work and avoid formation of scale and their subsequent failure. This implementation of the heater is achieved a significant reduction in its thermal inertia, as in the manufacture of heater use materials with a low heat capacity.

Before you begin, products being processed in the furnace, is loaded into the working space of the furnace, e.g. the measures on rail hanging system. Next, the control unit sets the mode and time of operation of the furnace (the furnace power is supplied from three-phase alternating current with frequency of 50 Hz with a nominal voltage of 380/220 V with tolerance ±10% from the nominal value.).

After this starts the motor ventilation and circulation (see figure 2) and in the working space of the furnace creates negative pressure (pressure below atmospheric), due to pumping the fan out of the oven air masses in amounts larger than they do in the working space of the furnace provided through its construction of the additional apertures (not shown).

Then voltage is applied to the heater (2)containing the structural frame (15), made of steel plates (16) and a rectangular metal tubes (18), made with holes (19) for placement in the form of tubes supporting a coil (17) of the rods (20). Regulating valve (12) centrifugal fan (3) under the control of the actuator (not shown) moves into position (141), is the blowout of the electric heater (2) through the first outlet port (8) fan (3), the air withdrawn from the ceiling of the furnace polymerization. Flap (4) holes spontaneously opens to partially compensate the loss of air.

Passing che the ez heater (2) hot air enters the working chamber from the bottom along the floor. Heat is transferred to the product, followed by heating, while the heated air carries away up the furnace the products of polymerization and then hits the fan. Then the main part of the already heated air is directed through the first outlet port (8) fan (3) to heater (2) and the cycle is repeated (i.e. recycling). This mode of operation of the furnace is called "heat".

This convection flow, the air will collect in the upper part of the furnace is heated again, passing through the fan on the heater, and served in the lower part of the furnace. The air in the furnace moves almost in a steady stream from the bottom up with a sufficiently high speed to ensure rapid heating of coated products, but not sufficient for ablation of paint with products and not rocking them.

When the temperature of coated products 160-180°begins With the formation of gaseous products of polymerization, which can cause yellowing of light-colored paints and deteriorating sanitary conditions. In the operation of the furnace there is a special removal system these products of polymerization, which is activated automatically when the set temperature is reached. This mode of operation of the furnace is called "drainage" (excerpt).

When using the oven in the "drainage" electroneg ewetel (2) periodically disables, then it turns on and the control valve (12) of the fan (3) periodically transferred from (141in (142and the air from the upper part of the chamber from time to time discharged through the outlet (9) (II) of the fan (3). Thus, in the working space of the furnace from time to time creates a powerful vacuum and a new cold air periodically (depending on the specified parameters), then flows through the filter in the furnace wall holes, inside the furnace by lifting the flap (4)is sent down the furnace, and then upward, thereby cooling products. Then this air, in accordance with a given periodicity enters the fan (3) and discharged through the outlet (9) (II) of the fan (2). The main objective of this stage of the furnace - cyclical upgrading of air masses furnace to maintain the desired temperature throughout its working volume, and removing the products of polymerization.

After the operation of the furnace in the "drainage" (excerpt) automatically/manually turns on the third mode is "ventilation".

When using the oven in the ventilation mode, the heater (2) is turned off, and the control valve (12) of the fan (3) is fully in position 142and the air from the upper part of the chamber is expelled through the outlet (9) (dt the e) fan (3). Creates a powerful vacuum and a new cold air goes through the filter in the furnace wall holes, inside the furnace by lifting the flap (4)is sent down the furnace, and then upward, thereby cooling products. Then this air enters the fan (3) and discharged through the outlet (9) (II) of the fan (2).

After the end of the operation of the furnace "ventilation" has already been processed products are removed from the furnace, cooled, suitable for further transport and handling.

In respect of the execution of the furnace perhaps more of the following additions. Spiral (17) electric heater (3) can be made from fehrle. The heater (2) the furnace can hold the lock plate (21), preventing the loss of housing supporting a coil (17) of the rods (20). Also the heater (2) may contain the current terminals (22)made in the form of a rod, and a coil (17) and the core of the cold end (22) can be attached, for example by welding, to tokoyoda plate (23). Regulating valve (12) of the fan can be made in the form of a metal plate, attached to the axis (13), can be locked in different positions (141) and (142).

As can be seen from the above example, through the development of a fundamentally new method of melting and floor is merisalo in the oven powder coating eliminates the above disadvantages, inherent in similar ways.

The improved heating system of the furnace and ventilation and circulation that allows you to organize and more uniform heating of products, curing of the coating on the product, the configuration of any complexity, with the impact on the quality of processed products, as well as improving the environmental safety of the furnace during operation.

Testing and production of the polymerization furnace operating in accordance opened the way, confirmed the achievement of the above-mentioned characteristics as well as high consumer quality products.

1. Method of melting and polymerization in an oven powder coatings, including loading of items into the furnace, heating to the implementation of the polymerization of the coating and cooling, characterized in that before heating in the working space of the furnace creates a vacuum through the provisional inclusion of ventilation and circulation, after heating to a predetermined temperature to produce periodic stopping and starting of the electric furnace, thus shall exhaust air from the furnace through the outlet of the centrifugal fan circulation system and ventilation through periodic switching regulating valve fan to maintain a constant temperature throughout the working volume of the furnace Cerezo least one production hole in the furnace periodically submit a portion of cold air, then carry out cooling, in which the heater completely off, and saturated with products of the polymerization of the air is removed from the oven, creating a vacuum and served in the oven a new batch of cold air.

2. The method according to claim 1, characterized in that heating use heater made of steel plates and rectangular metal tubing made with holes for placement is made in the form of tubes supporting the spiral rod and the supporting spiral heater rods are made mulitocrementerrestrial ceramics.

3. The method according to claim 2, characterized in that use heater with spiral from fehrle.

4. The method according to claim 1 or 2, characterized in that use the heater with the retainer plate.

5. The method according to claim 1 or 2, characterized in that use the heater with the cold end, made in the form of a rod.

6. The method according to claim 5, characterized in that use electric heater, spiral which is the core of the cold end is connected by welding with tokoyoda plate.

7. The method according to claim 1 or 2, characterized in that use fan with control valve in the form of a metal plate, attached to the axis.

8. The method according to claim 1 or 2, characterized in that the regulating valve fan mouth is avleat can be locked in various positions.



 

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