CN212948727U

CN212948727U - Microwave curing equipment

Info

Publication number: CN212948727U
Application number: CN202021150075.5U
Authority: CN
Inventors: 孟博; 林大庆; 黎昱; 陈维强; 张玉生; 朱大雷; 蒋贵刚; 崔林如; 沈宇新
Original assignee: Beijing Satellite Manufacturing Factory Co Ltd
Current assignee: Beijing Satellite Manufacturing Factory Co Ltd
Priority date: 2020-06-19
Filing date: 2020-06-19
Publication date: 2021-04-13
Anticipated expiration: 2030-06-19

Abstract

The utility model provides a microwave curing device, which comprises a microwave unit, a conveyor belt unit and an air outlet system, wherein the conveyor belt unit carries the material sprayed with the adhesive and enters a cavity of the microwave unit, and the microwave unit heats and cures the adhesive through microwaves; the microwave unit is divided into a preheating area, a curing area and a post-processing area, wherein the power of a magnetron in the preheating area accounts for 2/5-3/5 of the total power, the material is dried, the power of the magnetron in the curing area accounts for 3/10-1/2 of the total power, the adhesive is heated and cured, the power of the magnetron in the post-processing area accounts for 1/10 of the total power, and the heating and curing are continuously carried out; the air outlet system is communicated with the microwave unit and discharges steam generated by microwave heating through an air outlet pipeline. The utility model provides an use traditional heat source to heat low heat conduction material, the problem of inefficiency uses the microwave heating mode, has improved energy utilization greatly, has shortened combined material curing cycle for big batch, streamlined production become possible.

Description

Microwave curing equipment

Technical Field

The utility model belongs to heated board production facility field, in particular to microwave curing equipment suitable for heated board production.

Background

The appearance of the novel heat-insulation board solves the dilemma that fireproof materials do not preserve heat and heat-insulation materials do not prevent fire, and has the characteristics of being green, non-toxic and the like. Along with the gradual maturity and stability of novel heated board technique, market demand is more obvious, and batch production, the novel heated board of supply become the problem that is compelling.

The composite material for heat insulating board is new material and has the core characteristic of very low heat conducting coefficient. The novel insulation board composite material production process relates to a curing process, however, no complete batch production line equipment and process can be referred to in the market. Combine laboratory research and development to explore, common solidification technology and equipment of combined material trade can not satisfy the fast curing demand of the novel heated board of low heat conduction, if adopt conventional heating furnace or baking house, can appear following problem:

(i) because the thermal conductivity coefficient of the insulation board material is very low, the heat is transferred from outside to inside very slowly, and the curing period is very long;

(ii) due to the fact that heat transfer is very slow, temperature gradient occurs inside the material, the insulation board is not uniform in solidification and prone to layering, and performance is not stable;

(iii) the product is warped due to the internal temperature gradient, and the flatness is unqualified;

(iv) the heat loss caused by (i) is large, resulting in energy loss.

(v) The production efficiency is low due to the long curing period, which is caused by (i), and large-scale mass production cannot be satisfied.

Accordingly, there is a need to develop a new curing apparatus to solve at least one of the above problems.

SUMMERY OF THE UTILITY MODEL

In order to overcome the deficiencies in the prior art, the inventor has carried out keen study, a microwave curing device is provided, the bonding force between molecular activity and composition is improved through electromagnetic wave activation adhesive polar molecule, through carrying out the subregion to microwave curing device according to the product characteristic, the problem of low heat conduction material solidification inhomogeneously, the quality is poor has been solved, the thermal insulation performance and the mechanical properties (vertical plate surface tensile strength) of heated board have been improved, the curing time has been shortened, the curing pressure has been removed, the curing temperature has been reduced, the use of curing auxiliary agent has been reduced, the energy utilization rate has been improved, the energy consumption has been greatly reduced, the cost is reduced, thereby accomplish the utility model discloses.

The utility model provides a technical scheme as follows:

a microwave curing device comprises a microwave unit, a conveyor belt unit and an air outlet system, wherein the microwave unit is provided with a cavity structure, the conveyor belt unit carries a material sprayed with an adhesive and enters the cavity of the microwave unit, and the microwave unit heats and cures the adhesive through microwaves;

the heating element of the microwave unit is a magnetron, the magnetron is arranged at the top of the inner cavity of the microwave unit and is used for heating materials passing through the lower part of the magnetron in a microwave manner;

the microwave unit is divided into a preheating area, a curing area and a post-processing area, wherein the power of a magnetron in the preheating area accounts for 2/5-3/5 of the total power, the material is dried, the power of the magnetron in the curing area accounts for 3/10-1/2 of the total power, the adhesive is heated and cured, the power of the magnetron in the post-processing area accounts for 1/10 of the total power, and the heating and curing are continuously carried out;

the air outlet system is communicated with the microwave unit and discharges steam generated by microwave heating through an air outlet pipeline.

Furthermore, the microwave curing equipment also comprises a hot air system, the hot air system comprises an RTO incinerator and a hot air compensation pipeline, organic matters carried by steam discharged from the microwave unit enter the incinerator for combustion, and hot air generated by combustion in the incinerator enters the microwave unit from the aftertreatment area through a hot air inlet on the aftertreatment area.

According to the utility model provides a pair of microwave curing equipment has following beneficial effect:

(1) the device of the utility model solves the problem that the low heat conduction material is heated by the traditional heat source and has low efficiency, when the insulation board is produced, the microwave heating mode is used, the penetrating fiber directly acts on the adhesive (water-soluble thermosetting resin), the energy utilization rate is greatly improved, the energy consumption is reduced, the curing period of the composite material is shortened, the mass and flow line production is possible, and the problem of batch production of the novel insulation board is solved;

(2) the device of the utility model is different from the traditional curing device, and redefines the composite material curing assembly line;

(3) the utility model solves the problems of uneven solidification and poor quality of low heat conduction materials and production accidents caused by easy burning of materials at the rear section of microwave solidification by setting the microwave solidification equipment in different areas;

(4) the utility model discloses a hot air system's setting has realized the zero release of pollutant in the production process.

Drawings

FIG. 1 is a schematic structural view of a microwave curing apparatus according to a preferred embodiment of the present invention;

fig. 2 shows a schematic structural view of an RTO incinerator in a preferred embodiment of the present invention.

Description of the reference numerals

101-magnetron, 102-air outlet, 103-hot air inlet, 104-press roll, 201-conveyor belt, 202-gear, 203-support roll, 301-waste gas inlet, 302-waste gas pipeline, 303-heat storage chamber, 304-hearth and 305-drain pipe.

Detailed Description

The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.

Aiming at the problems existing in the prior art of curing of the insulation board material, the inventor of the invention carries out a great deal of research and finds that the curing efficiency can be effectively improved by activating polar molecules of the adhesive by microwaves and improving the binding force between the molecular activity and the components. However, in order to realize industrialization, a plurality of microwave manufacturers and a plurality of microwave devices are tested by visiting, the problem of long curing period caused by low thermal conductivity of the material can be generally solved, the curing period is shortened, but the following problems occur:

(i) oxidizing and igniting the material;

(ii) the material cannot be cured;

(iii) because the developed novel heat insulation board material adopts the fiber material and the water-soluble adhesive (such as water-soluble phenolic resin which is thermosetting resol), the cured composite material cannot be removed due to the fact that the original water is coated by the resin, and the curing fails;

(iv) the whole material is deformed and warped;

(v) the temperature of the material is difficult to control, and the adhesive is decomposed to generate unpleasant odor.

Therefore, the inventor provides a novel microwave curing device to meet the application in practical production. The microwave curing equipment comprises a microwave unit, a conveyor belt unit and an air outlet system, wherein the microwave unit is provided with a cavity structure, the conveyor belt unit bears a material after the adhesive is sprayed and enters a cavity of the microwave unit, and the microwave unit heats and cures the adhesive through microwaves. Specifically, the heating element of the microwave unit is a magnetron 101, and the magnetron 101 is installed at the top of the inner cavity of the microwave unit and is used for microwave heating of the material passing below the magnetron 101.

As shown in fig. 1, the microwave unit is divided into a preheating zone, a curing zone and a post-treatment zone, wherein the magnetron power in the preheating zone accounts for 2/5-3/5 (preferably 1/2) of the total power, the magnetron power in the curing zone accounts for 3/10-1/2 (preferably 2/5) of the total power, and the magnetron power in the post-treatment zone accounts for 1/10 of the total power; the preheating zone is used for heating the fiber material and the adhesive and playing a role in drying the material; in the curing zone, the adhesive coated among the fiber materials realizes adhesion and curing, and the fiber surface has viscosity; in the post-treatment area, the curing degree of the adhesive can reach more than 98 percent by further heating, and the stability of the heat-insulating material is enhanced. Power partitioning is carried out according to the characteristics of the product, so that the effect similar to that of fiber boiling in warm water caused by slow temperature rise in a preheating zone is avoided on the premise of average power distribution, the material cannot be dried in time, and finally solidification is not finished, so that the product performance is poor; the power is divided according to the characteristics of the product, and the risks of high temperature of a post-processing area, oxidation of phenolic resin and fire on the premise of average power distribution are avoided.

The microwave unit is provided with a plurality of air outlets 102, and each air outlet 102 is communicated with an air outlet pipeline of the air outlet system and used for discharging steam generated by microwave heating. The setting of air outlet satisfies that preheating zone air-out flow is not less than 3/5 of total air-out flow, solidification zone air-out flow is not less than 3/20 of total air-out flow, aftertreatment district does not have air-out flow when equipment is worked, but aftertreatment district sets up at least one air outlet, and the air outlet of aftertreatment district is closed completely when equipment is worked, does not have air-out flow, but in order to guarantee production safety, in time dispel the heat when the condition such as material burning takes place, aftertreatment district reserves the air outlet. Further, the air outlets 102 in each zone are of the same size, and the air outlets 102 in each zone are evenly distributed. The distribution of the air outlet 102/air outlet flow avoids that the steam in the preheating area caused by the average distribution of the air outlet 102/air outlet flow cannot be quickly discharged, is condensed on the ceiling of the cavity of the equipment and drops on the surface of the material to cause surface 'mottling'; the waste of hot gas in a curing area is avoided, and the energy utilization rate is improved; the waste of hot air inlet when a hot air system is used in the post-treatment area is avoided, and the energy utilization rate is improved.

The inventor discovers in production that the use of microwave has the phenomenon that the heated board is wholly deformed and warped, and then confirms, installs at least one compression roller 104 in the microwave unit, and compression roller 104 exerts pressure to the material that bears on the conveyer belt unit, and the roughness of final product can be guaranteed to the suppression through the compression roller, and the material warp when avoiding high temperature curing leads to final shaping heated board surface unevenness.

Further, the press roll 104 is installed at the end of the preheating zone and/or the initial stage of the curing zone. The installation position of the press rolls is very relevant for the shaping of the product material, and contact pressure is applied at the end of the preheating zone and/or at the beginning of the curing zone.

The utility model discloses in, the conveyer belt unit includes conveyer belt 201, and conveyer belt 201 drives through the gear 202 that is located microwave unit both ends, and the processing of conveyer belt 201 bottom is fluted, and the tooth on recess and the gear 202 cooperatees.

Further, the gear 202 is driven by a servo motor, and the servo motor drives the gear 202 to rotate by monitoring the incoming material speed, so that the speed of the conveyor belt 201 is the same as the incoming material speed.

Further, a support roller 203 is installed at a lower portion of the conveyor belt 201 at an interval, and the support roller 203 is in contact with a rear surface of the conveyor belt 201 to position the entire conveyor belt 201 at a desired height. The support roller 203 is a passive roller, and is driven by the conveyor belt to rotate, so that the conveyor belt speed is not interfered.

The utility model discloses in, microwave curing equipment still includes hot air system, and this hot air system includes RTO (regenerative Thermal oxidizer) burns burning furnace and hot-blast compensation pipeline, and microwave unit exhaust steam carries the organic matter among the adhesive and gets into to burn burning furnace burning, burns burning furnace burning production hot-blast entry 103 on the aftertreatment district and gets into the microwave unit by the aftertreatment district, realizes Thermal compensation. In the curing zone, the adhesive is basically cured, in order to realize continuous curing, the stability of the product is improved, the microwave power required by the post-treatment zone must be increased, but the action time is required to be very short, so that the microwave heating is extremely difficult to control, the temperature rises instantly by hundreds of degrees, materials and equipment are easy to burn, and production accidents are caused. Therefore, through research and development, it is determined that high-power microwaves are not used in a post-treatment area, a hot air system and microwaves are combined initially, and after the temperature is stable, the hot air system is only used for further curing the adhesive. Hot air system/thermal compensation function is realizing the utility model discloses when the zero pollution of microwave curing equipment, process accurate control and production safety have been guaranteed. The compensation flow of the hot air system is related to the productivity and the total power and is not less than the air outlet flow of the curing area.

The inventor discovers in production, adopt current RTO incinerator can not satisfy the hot-blast compensation demand of continuous stability completely, the reason lies in carrying a large amount of steam by microwave unit exhaust steam, steam is condensed by waste gas import 301 entering RTO incinerator back steam, the siltation can't in time effectively discharge in exhaust duct 302, water siltation blocks up exhaust duct 302 after serious, can't make follow-up steam get into regenerator 303 heat transfer, and then can't get into furnace 304 burning and produce the flue gas and supply to the microwave unit, only can start production after the equipment stall drainage, cause assembly line production not to be consistent, reduce production efficiency. To this end, the inventor modified the existing equipment to add a self-draining device to the exhaust pipe 302 at the end of the exhaust inlet 301. The self-draining device comprises an S-shaped drain pipe 305, one end of the drain pipe 305 is communicated with the waste gas pipeline 302, and water accumulated in the waste gas pipeline 302 enters the drain pipe 305 and is discharged from the other end opening of the drain pipe, as shown in figure 2. Due to the S-shaped design of the drain pipe and the water sealing function of the water reserved in the pipeline, the steam entering the incinerator cannot overflow from the incinerator except the condensed water.

The utility model discloses in, when adopting above-mentioned microwave curing equipment to implement the solidification process, can adopt following step:

step 1, determining the power of each area of the microwave curing equipment, the flow distribution and setting of the air outlet 102, the heat energy compensation amount and the speed of a conveyor belt according to the capacity;

step 2, in the starting stage of the microwave curing equipment, microwaves of all areas are started along with the material process; after the materials pass through the preheating zone, opening an air outlet system, and after the materials pass through the curing zone, opening a hot air system; wherein the power of the magnetron 101 in the preheating zone accounts for 2/5-3/5 (preferably 1/2) of the total power, the power of the magnetron 101 in the curing zone accounts for 3/10-1/2 (preferably 2/5) of the total power, and the power of the magnetron 101 in the post-treatment zone accounts for 1/10 of the total power; the air outlet flow in the preheating zone is not lower than 3/5 of the total air outlet flow, the air outlet flow in the curing zone is not lower than 3/20 of the total air outlet flow, and the air outlet flow in the post-treatment zone is not higher than;

and 3, after the material is discharged from the microwave curing equipment and the microwave curing equipment establishes thermal environment balance, carrying out magnetron shutdown adjustment according to power partitions, and if the power of the preheating zone 1/5-1/4 is shut down, shutting down the whole power of the post-processing zone.

After the thermal balance is realized, the working states of all working units of the equipment are supervised, the power of all areas does not need to be regulated, and the curing process can be stably carried out.

The present invention has been described in detail with reference to the specific embodiments and the exemplary embodiments, but the description should not be construed as limiting the present invention. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and embodiments thereof without departing from the spirit and scope of the present invention, and all fall within the scope of the present invention. The protection scope of the present invention is subject to the appended claims.

The details of the present invention not described in detail in the specification are well known to those skilled in the art.

Claims

1. A microwave curing device is characterized by comprising a microwave unit, a conveyor belt unit and an air outlet system, wherein the microwave unit is provided with a cavity structure, the conveyor belt unit bears a material sprayed with an adhesive and enters the cavity of the microwave unit, and the microwave unit heats and cures the adhesive through microwaves;

the heating element of the microwave unit is a magnetron (101), the magnetron (101) is arranged at the top of the inner cavity of the microwave unit and is used for heating materials passing through the lower part of the magnetron (101) in a microwave mode;

2. The microwave curing apparatus according to claim 1, wherein a plurality of air outlets (102) are disposed in the microwave unit, each air outlet (102) is connected to an air outlet duct of the air outlet system, the arrangement of the air outlets satisfies that the air outlet flow rate of the preheating zone is not lower than 3/5 of the total air outlet flow rate, the air outlet flow rate of the curing zone is not lower than 3/20 of the total air outlet flow rate, the air outlet flow rate of the post-processing zone is not higher, but at least one air outlet is disposed in the post-processing zone.

3. Microwave curing apparatus according to claim 1, characterized in that at least one press roll (104) is installed in the microwave unit, the press roll (104) applying pressure to the material carried on the conveyor unit.

4. A microwave curing apparatus according to claim 3, characterized in that the press rolls (104) are installed at the end of the preheating zone and/or at the beginning of the curing zone.

5. Microwave curing device according to claim 1, characterized in that the conveyor unit comprises a conveyor belt (201), the conveyor belt (201) is driven by gears (202) located at both ends of the microwave unit, and the bottom of the conveyor belt (201) is provided with grooves which fit with the teeth on the gears (202).

6. Microwave curing apparatus according to claim 1, characterized in that the gear (202) is driven by a servo motor which drives the rotation of the gear (202) by monitoring the incoming material speed, so that the conveyor belt (201) speed is the same as the incoming material speed.

7. The microwave curing apparatus according to claim 1, wherein the lower portion of the conveyor belt (201) is provided with a plurality of support rollers (203) at intervals, and the support rollers (203) are in contact with the back surface of the conveyor belt (201) so that the conveyor belt (201) is located at a desired height as a whole.

8. The microwave curing apparatus of claim 1, further comprising a hot air system, wherein the hot air system comprises an RTO incinerator and a hot air compensation pipeline, the steam discharged from the microwave unit is burnt in the incinerator with organic matters, and hot air generated by burning in the incinerator enters the microwave unit from the post-treatment area through a hot air inlet (103) on the post-treatment area.

9. The microwave curing apparatus according to claim 8, wherein the RTO incinerator comprises an exhaust gas inlet (301) and an exhaust gas pipe (302), the steam discharged from the microwave unit carries organic matters from the exhaust gas inlet (301) into the exhaust gas pipe (302), and a self-draining device is added on the exhaust gas pipe (302) at the end of the exhaust gas inlet (301).

10. Microwave curing apparatus according to claim 9, characterized in that the self-draining means comprises an S-shaped drain pipe (305), one end of the drain pipe (305) is connected to the exhaust gas pipe (302), and water accumulated in the exhaust gas pipe (302) enters the drain pipe (305) and is discharged from the other end opening of the drain pipe.