A microwave heating box and a slab microwave heating system

Abstract

The utility model relates to the field of plate blank production equipment discloses a microwave heating box and plate blank microwave heating system, and the microwave heating box includes the outer box, and the middle part of outer box is divided into the upper part closed space and the lower space that forms the plate conveying channel through a baffle, and the upper part closed space is distributed with a plurality of first waveguide boxes for guiding microwave to enter into the lower space, is equipped with a magnetron on every first waveguide box, and a microwave transmission opening is set up in the position department of every first waveguide box on the baffle, still including a plurality of second waveguide boxes, and the lower surface of baffle is set up with a second waveguide box in the position department of every microwave transmission opening downwardly extending, the utility model has the advantages of: can better protection effect to magnetron, promotes the service life of magnetron.

Description

Technical Field

[0001] This utility model relates to the technical field of slab production equipment, specifically a microwave heating box and a slab microwave heating system. Background Technology

[0002] Microwaves are electromagnetic waves with extremely short wavelengths, ranging from 1 mm to 1 m, and corresponding frequencies between 300 GHz and 300 MHz. To prevent microwaves from interfering with radio communications, broadcasting, and radar, the internationally designated frequencies for microwave heating and microwave drying are: 915 MHz with a center wavelength of 330 mm; and 2450 MHz with a center wavelength of 122 mm.

[0003] Microwaves are generated by applying direct current or 50Hz alternating current to vacuum tubes or semiconductor devices, utilizing the special motion of electrons in a magnetic field. This special motion can be explained as follows: From an electrical structure perspective, there are two types of dielectrics: nonpolar and polar. Under normal circumstances, they are arranged randomly. When placed in an alternating electric field, the orientation of the polar molecules in these dielectrics changes with the polarity of the electric field; this is called polarization. The stronger the applied electric field, the stronger the polarization; the faster the polarity of the applied electric field changes, the faster the polarization, and the more intense the thermal motion of the molecules and the friction between adjacent molecules. In this process, electromagnetic energy is converted into thermal energy. When the material to be heated is placed in a microwave field, its polar molecules oscillate and rub back and forth at a high frequency of billions of times per second, generating enough heat to heat and dry the material in a very short time.

[0004] Currently, microwave heating systems are frequently used for heating the core surface of particleboard, MDF, plywood and other board products. For example, Chinese utility model patent application number CN201821661459.6 discloses a microwave preheating device for preparing particleboard. However, existing microwave heating devices suffer from the problem of magnetron damage during use. The reasons include: 1. Microwaves not absorbed by the material are easily reflected back to the magnetron (commonly known as "backbone"), easily causing damage; 2. The magnetron requires cooling water, and currently, corrugated pipes or hydraulic pipes are generally used to deliver cooling water to the magnetron. Because corrugated pipes or hydraulic pipes have a shielding effect and cannot remove heat from the top space of the magnetron, this is detrimental to extending the magnetron's lifespan; 3. To prevent water vapor and other impurities generated during heating from entering the magnetron through the waveguide box, ceramic or asbestos partitions are installed at the bottom of the waveguide box. However, ceramic partitions are easily broken, and asbestos partitions are easily burned through. Therefore, it is impossible to effectively prevent water vapor and other impurities from entering the magnetron and causing damage. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides a microwave heating box and a microwave heating system for slabs, which solves the problem of easy damage to the magnetron in existing microwave heating devices and can improve the service life of the magnetron.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] In a first aspect, a microwave heating box includes an outer casing, the middle of which is divided into an upper enclosed space and a lower space with a plate conveying channel by a partition. The upper enclosed space contains a plurality of first waveguide boxes for guiding microwaves into the lower space, each of which is provided with a magnetron. A microwave conduction opening is provided on the partition at the position corresponding to each first waveguide box. The box also includes a plurality of second waveguide boxes, the lower surface of which is provided with a second waveguide box extending downward at the position corresponding to each microwave conduction opening.

[0008] Furthermore, a high-transparency plate is provided inside the first waveguide box or the second waveguide box.

[0009] Furthermore, the high-transparency plate is a polytetrafluoroethylene plate.

[0010] Furthermore, the lower end of the first waveguide box and the upper end of the second waveguide box both extend outward to form extension pieces for fixed connection with the partition, and the high-transparency plate is pressed tightly onto the partition through the extension pieces.

[0011] Furthermore, both the first waveguide box and the second waveguide box have a square structure.

[0012] Furthermore, it also includes a magnetron cooling mechanism;

[0013] The magnetron cooling mechanism includes an inlet pipe located outside the outer casing and extending into the upper enclosed space, an outlet pipe located in the upper enclosed space and extending into the outer casing, a first connecting pipe connecting the inlet pipe and at least one magnetron, a second connecting pipe connecting the outlet pipe and at least one magnetron, and a third connecting pipe connecting the tops of two adjacent magnetrons.

[0014] Furthermore, each of the first connecting tube, the second connecting tube, and the third connecting tube is made of pure silicone tubing.

[0015] Furthermore, the water inlet pipe is equipped with a control valve.

[0016] Furthermore, the outer casing is provided with an oven door at the corresponding lower space position, and the oven door is provided with a shielding strip to prevent microwave leakage.

[0017] Secondly, a slab microwave heating system, wherein the slab microwave heating system employs the aforementioned microwave heating box.

[0018] By adopting the above-described technical solution of this utility model, at least the following beneficial effects are achieved:

[0019] 1. By designing a second waveguide box extending downwards at each microwave conduction opening on the lower surface of the partition, the microwave energy generated by the magnetron is conducted to the material to be heated (such as a slab) through the first waveguide box, the microwave conduction opening, and the second waveguide box during operation, thereby achieving microwave heating of the material. On the other hand, due to the obstruction of the second waveguide box, microwaves not absorbed by the material are less likely to be reflected back to the magnetron, thus effectively reducing the damage to the magnetron caused by microwave reflection.

[0020] 2. By designing the high-transparency plate as a polytetrafluoroethylene plate, it can prevent the high-transparency plate from being penetrated by microwaves during use and avoid breakage due to external forces. Therefore, it can better protect the magnetron and help extend the service life of the magnetron.

[0021] 3. By designing the first, second, and third connecting pipes to all be made of pure silicone tubing, on the one hand, it can better withstand the instantaneous pressure caused by pipe blockage during actual use without bursting or leaking water, thereby reducing damage to the magnetron; on the other hand, it can form a circulation system with a built-in water load suppressor, thereby suppressing microwaves and removing heat from the upper enclosed space, thus reducing the temperature in the upper enclosed space and helping to extend the service life of the magnetron.

[0022] 4. By installing a shielding strip on the oven door, microwave leakage from the oven door can be effectively prevented. Attached Figure Description

[0023] Figure 1 This is a front view of the microwave heating box of this utility model;

[0024] Figure 2 This is a three-dimensional structural diagram of the microwave heating box of this utility model;

[0025] Figure 3 This is a left view of the microwave heating box of this utility model;

[0026] Figure 4 This is a cross-sectional view of the microwave heating box of this utility model;

[0027] Figure 5 for Figure 4 Enlarged view of part A in the middle;

[0028] Figure 6This is a structural diagram of the microwave heating system for slabs according to this utility model.

[0029] Figure label:

[0030] Microwave heating box 100;

[0031] 200 slab microwave heating system;

[0032] Outer casing 1, partition 11, microwave conduction opening 111, upper enclosed space 12, lower space 13, plate conveying channel 131, furnace door 14, shielding strip 15;

[0033] First waveguide box 2;

[0034] Magnetron 3;

[0035] Second waveguide box 4;

[0036] High-transparency panel 5;

[0037] Extension piece 6;

[0038] Magnetron cooling mechanism 7, water inlet pipe 71, water outlet pipe 72, first connecting pipe 73, second connecting pipe 74, third connecting pipe 75, control valve 76;

[0039] Conveyor 8;

[0040] Microwave suppressor 9. Detailed Implementation

[0041] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] Example 1

[0043] Please see the appendix Figures 1 to 5As shown, this utility model provides a microwave heating box 100, which includes an outer box 1. The middle of the outer box 1 is divided into an upper enclosed space 12 and a lower space 13 with a plate conveying channel 131 by a partition 11. The plate conveying channel 131 is used to realize the input and output of the plate and to microwave heat the plate in the lower space 13. Several first waveguide boxes 2 are distributed in the upper enclosed space 12 to guide microwaves into the lower space 13. Each first waveguide box 2 is provided with a magnetron 3. The partition 11 is provided with a corresponding position for each first waveguide box 2. A microwave conduction opening 111 is provided. During operation, the magnetron 3 is controlled to generate microwaves, which are then conducted to the lower space 13 through the first waveguide box 2 and the microwave conduction opening 111. The microwave heating box 100 also includes several second waveguide boxes 4. A second waveguide box 4 is provided downwardly at the position corresponding to each microwave conduction opening 111 on the lower surface of the partition 11. In the specific implementation of this utility model, since the lower space 13 forms a plate conveying channel 131 for conveying the plate to be heated, it is necessary to ensure that the lower end of the second waveguide box 4 does not touch the plate to ensure that the normal conveying of the plate is not affected.

[0044] This invention designs a second waveguide box 4 extending downwards from the lower surface of the partition 11 at each microwave conduction opening 111. This allows the microwave energy generated by the magnetron 3 to be conducted to the material to be heated (such as a slab) through the first waveguide box 2, the microwave conduction opening 111, and the second waveguide box 4 during operation, thereby achieving microwave heating of the material. On the other hand, the second waveguide box 4 prevents microwaves not absorbed by the material from being reflected back to the magnetron 3, thus effectively reducing damage to the magnetron 3 caused by microwave reflection.

[0045] In some embodiments of this utility model, in order to prevent impurities such as water vapor from entering the magnetron 3 through the second waveguide box 4 and the first waveguide box 2 during the production process and thus reducing the service life of the magnetron 3, a high-transparency plate 5 is provided inside the first waveguide box 2 or the second waveguide box 4. By using the high-transparency plate 5, it can both block impurities such as water vapor and ensure that microwave energy is better conducted.

[0046] In a preferred embodiment of this invention, the high-transparency plate 5 is a polytetrafluoroethylene (PTFE) plate. By designing the high-transparency plate 5 as a PTFE plate, this invention can prevent the high-transparency plate 5 from being penetrated by microwaves during use and avoid breakage due to external forces. Therefore, it can provide better protection for the magnetron 3 and help extend the service life of the magnetron 3.

[0047] In some embodiments of this utility model, in order to better fix the high-transparency plate 5, the lower end of the first waveguide box 2 and the upper end of the second waveguide box 4 both extend outward to form extension pieces 6 for fixed connection with the partition 11, and the high-transparency plate 5 is pressed onto the partition 11 by the extension pieces 6. In specific implementations of this utility model, the high-transparency plate 5 can be pressed onto the upper surface of the partition 11 by the extension pieces 6 of the first waveguide box 2, or the high-transparency plate 5 can be pressed onto the lower surface of the partition 11 by the extension pieces 6 of the second waveguide box 4.

[0048] In one specific embodiment of this utility model, both the first waveguide box 2 and the second waveguide box 4 are square structures. Of course, the above is only one specific embodiment of this utility model, but the utility model is not limited to this. In specific implementations, other structural designs can be adopted according to actual usage needs, such as cylindrical structures.

[0049] In some embodiments of this utility model, the microwave heating box 100 further includes a magnetron cooling mechanism 7 to cool the magnetron 3.

[0050] The magnetron cooling mechanism 7 includes an inlet pipe 71 located outside the outer casing 1 and extending into the upper enclosed space 12, an outlet pipe 72 located in the upper enclosed space 12 and extending into the outer casing 1, a first connecting pipe 73 connecting the inlet pipe 71 and at least one magnetron 3, a second connecting pipe 74 connecting the outlet pipe 72 and at least one magnetron 3, and a third connecting pipe 75 connecting the tops of two adjacent magnetrons 3. In one specific embodiment of this utility model, several rows of magnetrons 3 are neatly arranged in the upper enclosed space 12. The first magnetron 3 in the same row is connected to the water inlet pipe 71 through the first connecting pipe 73, and the last magnetron 3 in the same row is connected to the water outlet pipe 72 through the second connecting pipe 74. At the same time, two adjacent magnetrons 3 in the same row are connected through the third connecting pipe 75. Of course, the above is only one specific embodiment of this utility model, but this utility model is not limited to this. Other connection methods can be adopted according to actual needs in specific implementation.

[0051] In a preferred embodiment of this utility model, each of the first connecting pipe 71, the second connecting pipe 72 and the third connecting pipe 73 is made of pure silicone tubing.

[0052] This invention utilizes pure silicone tubing for the first connecting pipe 71, the second connecting pipe 72, and the third connecting pipe 73. This design allows the tubing to better withstand the instantaneous pressure caused by pipe blockage during use, preventing pipe bursts and leaks, thus reducing damage to the magnetron 3. Furthermore, it creates a circulation system with a built-in water load suppressor, suppressing microwaves and removing heat from the upper enclosed space 12, thereby lowering its temperature and extending the lifespan of the magnetron 3.

[0053] In some embodiments of this utility model, the water inlet pipe 71 is equipped with a control valve 76, which can control whether to supply cooling water to each magnetron 3 for cooling according to actual needs during operation.

[0054] In some embodiments of this invention, the outer casing 1 is provided with an oven door 14 at a position corresponding to the lower space 13, and the oven door 14 is provided with a shielding strip 15 to prevent microwave leakage. This invention effectively prevents microwave leakage from the oven door 14 by providing a shielding strip 15 on the oven door 14.

[0055] Example 2

[0056] Please see Figures 1 to 6 As shown, this utility model discloses a slab microwave heating system 200. The slab microwave heating system 200 includes a microwave heating box 100, a conveyor 8, and a microwave suppressor 9. Several microwave heating boxes 100 are arranged side by side above the conveyor 8, and a microwave suppressor 9 is provided at the input end of the first microwave heating box 100 and the output end of the last microwave heating box 100. The microwave suppressor 9 can be an existing microwave suppressor, such as the microwave suppressor used in CN201821661459.6. The specific structure of the microwave heating box 100 and the beneficial technical effects obtained are exactly the same as those in Embodiment 1. For details, please refer to the detailed description of Embodiment 1, which will not be repeated here. The conveyor 8 can be a belt conveyor.

[0057] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A microwave heating box, comprising an outer casing, the middle of which is divided by a partition into an upper enclosed space and a lower space forming a plate conveying channel; the upper enclosed space contains a plurality of first waveguide boxes for guiding microwaves into the lower space; each first waveguide box is provided with a magnetron; and the partition has a microwave conduction opening at the position corresponding to each first waveguide box; characterized in that... It also includes several second waveguide boxes, and a second waveguide box is provided on the lower surface of the partition at the position corresponding to each microwave conduction opening.

2. The microwave heating box according to claim 1, characterized in that, A high-transparency plate is provided inside the first waveguide box or the second waveguide box.

3. A microwave heating box according to claim 2, characterized in that, The high-transparency plate is a polytetrafluoroethylene plate.

4. A microwave heating box according to claim 2, characterized in that, The lower end of the first waveguide box and the upper end of the second waveguide box both extend outward to form extension plates for fixed connection with the partition, and the high-transparency plate is pressed tightly onto the partition through the extension plates.

5. A microwave heating box according to claim 1, characterized in that, Both the first waveguide box and the second waveguide box have a square structure.

6. A microwave heating box according to claim 1, characterized in that, It also includes a magnetron cooling mechanism; The magnetron cooling mechanism includes an inlet pipe located outside the outer casing and extending into the upper enclosed space, an outlet pipe located in the upper enclosed space and extending into the outer casing, a first connecting pipe connecting the inlet pipe and at least one magnetron, a second connecting pipe connecting the outlet pipe and at least one magnetron, and a third connecting pipe connecting the tops of two adjacent magnetrons.

7. A microwave heating box according to claim 6, characterized in that, Each of the first, second, and third connecting tubes is made of pure silicone tubing.

8. A microwave heating box according to claim 6, characterized in that, The water inlet pipeline is equipped with a control valve.

9. A microwave heating box according to claim 1, characterized in that, The outer casing has an oven door located in the corresponding lower space, and the oven door is equipped with a shielding strip to prevent microwave leakage.

10. A microwave heating system for slabs, characterized in that, The slab microwave heating system uses a microwave heating box as described in any one of claims 1-9.

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