Log microwave quarantine treatment system

Abstract

The utility model discloses a log microwave quarantine treatment system, which belongs to the technical field of quarantine and inactivation of log diseases and insect pests and comprises a high-temperature steam inactivation chamber, a microwave treatment chamber and a log conveying line. A log conveying line sequentially penetrates through the high-temperature steam inactivation chamber and the high-temperature steam inactivation chamber, a steam spraying pipe is arranged in the high-temperature steam inactivation chamber, a steam exhaust port and a steam collecting cover are arranged on the top wall of the microwave treatment chamber, a cut-off waveguide is arranged in the steam exhaust port, and the steam exhaust port is covered with the inlet end of the steam collecting cover. The outlet end of the steam collecting cover is communicated with the steam spraying pipe through a steam conveying pipeline, and an air suction device is arranged on the steam conveying pipeline. High-temperature steam in the microwave treatment chamber can be pumped into the high-temperature steam inactivation chamber to be subjected to high-temperature inactivation, the problem of high-temperature steam energy waste is solved, meanwhile, two-time inactivation is achieved in cooperation with microwave inactivation, and the problem that the single microwave inactivation effect is poor is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of quarantine inactivation of pests and diseases of logs, in particular to a microwave quarantine treatment system for logs. Background Technique

[0002] Logs are one of the most important imported bulk commodities in China. The import of a large number of logs hides the problems of the spread and control of alien harmful organisms brought in with the logs, that is, the quarantine treatment problem. In the past, the world's common quarantine treatment method was mainly fumigation treatment with the chemical agent methyl bromide, but it has serious environmental pollution problems. Therefore, the International Plant Protection Organization encourages contracting parties to carry out the replacement of methyl bromide fumigation with microwave dielectric heating in wood quarantine treatment. The mechanism of microwave insecticidal effect is still inconclusive at present. Generally, there are several effects: 1) Thermal effect; 2) Non-thermal effect; 3) Comprehensive effect. Microwave insecticidal effect is mainly based on the thermal effect and supplemented by the non-thermal effect, which is the result of the combined action of multiple effects.

[0003] At present, the log microwave treatment system is mainly divided into a sealed cabin type treatment system and a microwave tunnel type treatment system. Microwave is supplied into the sealed cabin or the microwave tunnel through the microwave irradiation feed system, and then the logs can be subjected to microwave insecticidal treatment. The microwave irradiation feed system mainly includes a microwave frequency source, a feed waveguide, and a microwave antenna. The microwave frequency source and the feed waveguide are located outside the sealed cabin or the microwave tunnel, and the microwave antenna is located inside the sealed cabin or the microwave tunnel. The microwave generated by the microwave frequency source is introduced into the microwave antenna through the feed waveguide, and then can be introduced into the sealed cabin or the microwave tunnel through the microwave outlet of the microwave antenna to treat the logs. During the treatment of the logs, the logs are heated by the microwave, and the internal moisture will be heated and evaporated, generating a large amount of high-temperature steam. At present, the treatment of this part of high-temperature steam is to directly discharge it into the atmosphere, and the high-temperature steam contains a large amount of heat energy. Direct exhaust is undoubtedly a waste of resources. Content of the Utility Model

[0004] The purpose of the utility model is to solve the above technical problems, and provide a microwave quarantine treatment system for logs, which can pump the high-temperature water vapor in the microwave treatment room to the high-temperature steam inactivation room to inactivate the logs at high temperature, solve the problem of energy waste caused by direct external discharge of high-temperature steam, and at the same time, the high-temperature steam can moisten the surface of the logs, improve the absorption of the logs to the microwave, enhance the effect of microwave inactivation treatment, and moreover, the high-temperature inactivation is combined with the microwave inactivation to realize the two-time inactivation treatment of the logs, and also solve the problem that the inactivation effect may not be good in single microwave inactivation.

[0005] To achieve the above object, the present utility model provides the following solution: The present utility model discloses a log microwave quarantine treatment system, which includes a high-temperature steam inactivation chamber, a microwave treatment chamber, and a log conveyor line. The feeding end of the microwave treatment chamber is communicated with the discharging end of the high-temperature steam inactivation chamber. The log conveyor line sequentially passes through the feeding end and the discharging end of the high-temperature steam inactivation chamber, and the feeding end and the discharging end of the high-temperature steam inactivation chamber. A steam spray pipe is provided in the high-temperature steam inactivation chamber. A steam discharge port and a steam collection hood are provided on the top wall of the microwave treatment chamber. A cutoff waveguide is provided in the steam discharge port. The inlet end of the steam collection hood covers the steam discharge port therein. The outlet end of the steam collection hood is communicated with the steam spray pipe through a steam delivery pipeline. An air suction device is provided on the steam delivery pipeline.

[0006] Preferably, the microwave treatment chamber includes a microwave sealing chamber and a waveguide feeding device for feeding microwaves into the microwave sealing chamber. The feeding end of the microwave sealing chamber is communicated with the discharging end of the high-temperature steam inactivation chamber. Shielding doors are respectively provided at the feeding end and the discharging end of the microwave sealing chamber. The steam discharge port and the steam collection hood are provided on the top wall of the microwave sealing chamber.

[0007] Preferably, the microwave treatment chamber includes a feeding microwave suppressor, a microwave treatment tunnel, a discharging microwave suppressor, and a waveguide feeding device for feeding microwaves into the microwave treatment tunnel. The feeding end and the discharging end of the microwave treatment tunnel are respectively communicated with the feeding microwave suppressor and the discharging microwave suppressor. The feeding microwave suppressor is communicated with the discharging end of the high-temperature steam inactivation chamber. The steam discharge port and the steam collection hood are provided on the top wall of the microwave treatment tunnel.

[0008] Preferably, an air supply hood is provided on the top wall of the high-temperature steam inactivation chamber. The air supply hood includes an outer hood and an inner hood. The top wall of the outer hood is communicated with the steam delivery pipeline. The bottom wall of the inner hood is communicated with the steam spray pipe. The inner hood is located inside the outer hood. Air inlets are uniformly arranged circumferentially on the side wall of the inner hood.

[0009] Preferably, the air inlet is a strip-shaped opening, and the strip-shaped opening is vertically arranged on the side wall of the inner hood.

[0010] Preferably, the air suction device is a suction fan.

[0011] Preferably, the waveguide feeding device includes a microwave generator, a feeding waveguide, and a microwave antenna connected in sequence. The microwave generator is installed outside the microwave shielding chamber or the microwave treatment tunnel, and the microwave antenna is installed inside the microwave shielding chamber or the microwave treatment tunnel.

[0012] Preferably, a three-pin tuner is communicated between the microwave generator and the feeding waveguide.

[0013] Preferably, a microwave stirrer is provided inside the microwave shielding chamber or the microwave treatment tunnel.

[0014] Preferably, a temperature monitoring device and a video monitoring device are also provided inside the microwave shielding chamber or the microwave treatment tunnel.

[0015] The utility model has achieved the following technical effects compared with the prior art:

[0016] In the log microwave quarantine treatment system of the utility model, through the air suction device, the steam delivery pipeline and the steam collection hood, the high-temperature water vapor generated by the microwave treatment of logs in the microwave treatment chamber can be pumped into the high-temperature steam inactivation chamber, and the logs are subjected to preliminary high-temperature inactivation in the high-temperature steam inactivation chamber, and then microwave inactivation is carried out in the microwave treatment chamber. This solves the problem of energy waste caused by the direct discharge of high-temperature water vapor outside the microwave treatment chamber. At the same time, the high-temperature steam can moisten the surface of the logs, improve the absorption of microwaves by the logs, enhance the effect of microwave inactivation treatment, and the two inactivation treatments of high-temperature inactivation and microwave inactivation also solve the problem that the inactivation effect may not be good in single microwave inactivation. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of the log microwave quarantine treatment system;

[0019] Figure 2 It is a schematic structural diagram of the microwave treatment tunnel;

[0020] Figure 3 It is a partially enlarged schematic diagram of the microwave treatment tunnel;

[0021] Figure 4 It is a schematic structural diagram of the high-temperature steam inactivation chamber;

[0022] Figure 5 It is a schematic structural diagram of the air supply hood;

[0023] Figure 6 It is a schematic structural diagram of the inner hood;

[0024] Figure 7 It is a positional relationship diagram of the microwave treatment tunnel and the waveguide feeding device;

[0025] Figure 8 It is a schematic structural diagram of the waveguide feeding device.

[0026] Description of reference numerals: 1. Microwave treatment tunnel; 2. Feed microwave suppressor; 3. Discharge microwave suppressor; 4. High-temperature steam inactivation chamber; 5. Log conveyor line; 6. Steam discharge port; 7. Steam collection hood; 8. Steam delivery pipeline; 9. Steam nozzle; 10. Exhaust fan; 11. Outer cover; 12. Inner cover; 13. Air inlet; 14. Microwave antenna; 15. Camera; 16. Infrared temperature sensor; 17. Tray; 18. Log; 19. Microwave suppression sheet; 20. Microwave stirrer; 21. Cut-off waveguide; 22. Microwave generator; 23. Feeding waveguide; 24. Three-pin tuner; 25. Ventilation waveguide; 26. Blower; 27. Arc detector; 28. Polytetrafluoroethylene plate. Specific implementation mode

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0028] This embodiment provides a log microwave quarantine treatment system, as Figures 1 to 8 shown, including a high-temperature steam inactivation chamber 4, a microwave treatment chamber, and a log conveyor line 5. The feed end of the microwave treatment chamber is communicated with the discharge end of the high-temperature steam inactivation chamber 4, and the log conveyor line 5 sequentially passes through the feed end and the discharge end of the high-temperature steam inactivation chamber 4, and the feed end and the discharge end of the high-temperature steam inactivation chamber. A steam nozzle 9 is provided in the high-temperature steam inactivation chamber 4, and the number of the steam nozzles 9 can be set according to actual needs, and it is necessary to be uniformly arranged along the inlet to the outlet of the high-temperature steam inactivation chamber 4. A steam discharge port 6 and a steam collection hood 7 are provided on the top wall of the microwave treatment chamber. A cut-off waveguide 21 is provided in the steam discharge port 6 to prevent microwaves from escaping outward through the steam discharge port 6. The inlet end of the steam collection hood 7 covers the steam discharge port 6 therein, and the outlet end of the steam collection hood 7 is communicated with the steam nozzle 9 through a steam delivery pipeline 8. An air suction device is provided on the steam delivery pipeline 8. When the air suction device is started, the steam collection hood 7 will generate a suction force, and the high-temperature steam generated by microwave treatment of the log 18 in the microwave treatment chamber will be drawn into the steam collection hood 7 through the steam discharge port 6, and then sent to the steam nozzle 9 through the steam delivery pipeline 8. By opening the steam nozzle 9, high-temperature steam can be supplied into the high-temperature steam inactivation chamber 4 to perform high-temperature quarantine inactivation on the log 18 sent into the high-temperature steam inactivation chamber 4, eliminate insect poisons and diseases, and at the same time, the high-temperature steam will make the surface of the log 18 more moist, and use the water medium to improve the microwave absorption ability of the log 18 epidermis, so as to improve the temperature uniformity of the epidermis and the inner layer to effectively kill insect pests and viruses, etc.

[0029] In this embodiment, as Figures 1 to 8 shown, the microwave treatment chamber includes a microwave sealed cabin (not shown) and a waveguide feeding device. The waveguide feeding device is used to feed microwaves into the microwave sealed cabin to perform microwave quarantine inactivation on the logs 18 transported into the microwave treatment chamber, eliminating insect pests, diseases, etc. The feeding end of the microwave sealed cabin is communicated with the discharging end of the high-temperature steam inactivation chamber 4. Shielding doors are respectively arranged at the feeding end and the discharging end of the microwave sealed cabin. When the microwave sealed cabin performs microwave treatment on the logs 18, the shielding doors need to be closed to prevent microwave leakage. The steam discharge port 6 and the steam collection hood 7 are arranged on the top wall of the microwave sealed cabin. The whole system forms a sealed cabin type treatment system. Preferably, the microwave sealed cabin can be welded by galvanized steel plates and can be of a rectangular structure, and the specific dimensions are set according to actual needs. The shielding door can be a vertically lifting type shielding door.

[0030] In this embodiment, as Figures 1 to 8 shown, the microwave treatment chamber includes a microwave treatment tunnel 1, a feeding microwave suppressor 2, a discharging microwave suppressor 3, and a waveguide feeding device. The feeding end and the discharging end of the microwave treatment tunnel 1 are respectively communicated with the feeding microwave suppressor 2 and the discharging microwave suppressor 3, and the feeding microwave suppressor 2 is communicated with the discharging end of the high-temperature steam inactivation chamber 4. The log conveying line 5 passes through the high-temperature steam inactivation chamber 4, the feeding microwave suppressor 2, the microwave treatment tunnel 1, and the discharging microwave suppressor 3 in sequence along the conveying direction. The steam discharge port 6 and the steam collection hood 7 are arranged on the top wall of the microwave treatment tunnel 1. The waveguide feeding device is used to feed microwaves into the microwave treatment chamber to perform microwave quarantine inactivation on the logs 18 transported into the microwave treatment chamber, eliminating insect pests, diseases, etc. The whole system forms a microwave tunnel type treatment system. Preferably, the microwave treatment tunnel 1 can be welded by galvanized steel plates and can be of a rectangular structure, and the specific dimensions are set according to actual needs. The shielding door can be a vertically lifting type shielding door.

[0031] Furthermore, in order to improve the uniformity of the steam output of each steam nozzle 9, in this embodiment, as Figures 1 to 8 shown, a air supply hood is arranged on the top wall of the high-temperature steam inactivation chamber 4. The air supply hood includes an outer hood 11 and an inner hood 12. The top wall of the outer hood 11 is communicated with the steam conveying pipeline 8, and the bottom wall of the inner hood 12 is communicated with the steam nozzle 9. The outer hood 11 covers the outer of the inner hood 12, and air inlets 13 are evenly arranged circumferentially on the side wall of the inner hood. After the air suction device is started, the high-temperature steam drawn by the steam conveying pipeline 8 will first enter the outer hood 11 and fill the outer hood 11 first, and then enter the inner hood 12 from all directions through the air inlets 13 on the peripheral wall of the inner hood 12. After the inner hood 12 is quickly filled, it is ejected by each steam nozzle 9. Preferably, both the inner hood 12 and the outer hood 11 are circular, and the arrangement of the steam nozzles 9 can be arranged in a circular array or in a rectangular array.

[0032] In this embodiment, asFigures 1 to 8 As shown, the air inlet 13 is a strip-shaped opening, which is vertically arranged on the side wall of the inner cover 12 and extends from the top end to the bottom end of the inner cover 12.

[0033] In this embodiment, Figures 1 to 8 As shown, the air suction device is an exhaust fan 10. Of course, other devices that can play an exhaust effect are also acceptable.

[0034] Further, in this embodiment, if Figures 1 to 8 As shown, the log conveying line 5 is disconnected from each other and spaced apart between the parts in the high-temperature steam deactivation chamber 4, the feed microwave suppressor 2, the microwave treatment tunnel 1, and the discharge microwave suppressor 3. The height of the conveying surface of the log conveying line 5 in the high-temperature steam deactivation chamber 4, the feed microwave suppressor 2, the microwave treatment tunnel 1, and the discharge microwave suppressor 3 is successively reduced to facilitate the transfer of logs, preferably by 2 cm. Of course, the above is only one embodiment, and in fact, the log conveying line 5 in the high-temperature steam deactivation chamber 4, the feed microwave suppressor 2, the microwave treatment tunnel 1, and the discharge microwave suppressor 3 can also be a whole conveying line, or partially disconnected.

[0035] Further, in this embodiment, if Figures 1 to 8 As shown, the carrying capacity of the log conveyor line 5 is not less than 15 tons. The log conveyor line 5 in the microwave treatment tunnel 1 (or microwave shielding cabin) adopts a conveyor belt, which can be a non-metallic woven belt or a non-metallic chain plate conveyor belt, such as a high-strength plastic chain plate, so that the high-power microwave will not cause ignition during operation in the microwave treatment tunnel 1.

[0036] In this embodiment, Figures 1 to 8 As shown, the waveguide feeding device includes a microwave generator 22, a microwave antenna 14 and a feeding waveguide 23. The microwave generator 22 is installed outside the microwave treatment tunnel 1 (or microwave shielding cabin), and the microwave antenna 14 is installed inside the microwave treatment tunnel 1 (or microwave shielding cabin). A microwave outlet is arranged on the microwave antenna 14. The microwave generator 22, the feeding waveguide 23 and the microwave antenna 14 are connected in sequence. The microwave generator 22 provides a microwave source, and the feeding waveguide 23 is responsible for supplying the microwave source into the microwave antenna 14, and then the microwave outlet of the microwave antenna 14 is used to provide microwaves into the microwave treatment tunnel 1 (or microwave shielding cabin), so as to perform microwave inactivation treatment on the logs 18 in the microwave treatment tunnel 1 (or microwave shielding cabin).

[0037] Further, in this embodiment, if Figures 1 to 8As shown in the figure, a three-pin tuner 24 is connected between the microwave generator 22 and the feed waveguide 23. Since microwaves will be reflected inside the microwave processing tunnel 1 (or microwave shielding chamber), it is very likely that microwaves will enter the interior of the microwave antenna 14. The energy received by the microwave antenna 14 will enter the microwave generator 22, and the change in the standing wave ratio will cause damage to the microwave generator 22. Therefore, when the standing wave ratio deteriorates, it is necessary to adjust the standing wave of the microwave antenna 14 through the three-pin tuner 24 to achieve a standing wave ratio not higher than 2 and protect the microwave generator 22. The three-pin tuner 24 is also a section of waveguide. Three holes are opened in the middle of the waveguide and three pins are inserted. The depth of the three pins is controlled by a motor, and the depth of the pins is controlled in real time according to the measured standing wave ratio of the antenna to adjust the standing wave of the antenna.

[0038] In order to prevent the water vapor generated by the heating of the log from entering the microwave antenna 14, resulting in the condensation of internal water vapor and causing discharge and ignition, in this embodiment, as Figures 1 to 8 shown in the figure, a ventilation waveguide 25 is connected between the three-pin tuner 24 and the feed waveguide 23. An air inlet hole and a blower 26 for supplying air to the air inlet hole are provided on the ventilation waveguide 25. Keep the positive pressure inside the feed waveguide 23 and the microwave antenna 14 to remove water vapor and debris, and prevent water vapor and debris from entering valuable devices such as the three-pin tuner 24 and the microwave generator 22. Preferably, the air inlet holes are round holes arranged in a matrix, and the round holes are very small to shield microwaves. Usually, the diameter of the round holes is less than 1 cm.

[0039] Furthermore, in this embodiment, as Figures 1 to 8 shown in the figure, a metal air hood capable of shielding microwaves is provided at the air outlet end of the blower 26. The metal air hood covers the air inlet holes, and dry air can be provided through the blower 26.

[0040] In this embodiment, as Figures 1 to 8 shown in the figure, a polytetrafluoroethylene plate 28 is covered on the microwave outlet of the microwave antenna 14 to prevent water vapor from entering the microwave antenna 14 from the microwave outlet.

[0041] Furthermore, in this embodiment, as Figures 1 to 8 shown in the figure, an arc detector 27 is provided on the feed waveguide 23 to monitor the ignition phenomenon in the waveguide. If an ignition phenomenon occurs, a trigger signal will be generated to the frequency source, and the microwave generator 22 will automatically shut down after receiving the signal to avoid continuous ignition and causing accidents.

[0042] In this embodiment, as Figures 1 to 8As shown in the figure, there are two rows of microwave antennas 14 arranged vertically in the microwave treatment tunnel 1 (or microwave shielding cabin), and the log conveyor line 5 is located between the two rows of microwave antennas 14. Specifically, the number of microwave antennas 14 provided in each of the two rows of microwave antennas 14 is set according to actual needs and engineering designs. For example, four microwave antennas 14 can also be provided in the upper row, and four in the lower row. As long as the microwave energy in the microwave treatment tunnel 1 can be evenly distributed, the number is not overly restricted.

[0043] Furthermore, in this embodiment, as Figures 1 to 8 shown in the figure, a microwave stirrer 20 can also be provided in the microwave treatment tunnel 1 (or microwave shielding cabin) to expand the microwave coverage range and uniformity.

[0044] In this embodiment, as Figures 1 to 8 shown in the figure, when the log conveyor line 5 conveys the logs 18, pallets 17 are used to carry the logs 18 to prevent the logs 18 from rolling. Preferably, the pallets 17 are made of special fiberglass-reinforced plastic pallets. Their outer frames are welded from steel structures, galvanized on the surface, with a zinc layer thickness of more than 50 microns. There are forklift holes at the bottom and lifting holes identical to those of containers at the top. The fiberglass-reinforced plastic pallet surface is composed of fiberglass-reinforced plastic crossbeams 3.2 m long and fiberglass-reinforced plastic flat plates. The fiberglass-reinforced plastic crossbeams have a log-carrying capacity of 15 tons, and the fiberglass-reinforced plastic flat plates are used to prevent sundries from falling onto the ground inside the cabin. The area of 2.6 m wide * 12 m long in the middle of the fiberglass-reinforced plastic pallet is the log-carrying area. The logs 18 are arranged in a single layer. The volume of logs 18 laid flat on a single pallet 17 is about 10 cubic meters, ensuring that the logs 18 are irradiated by microwaves in both the up and down directions. Of course, the above is only the preferred method. If the microwave energy is sufficient, the logs 18 can also be arranged in multiple layers to improve the single-batch processing speed.

[0045] In this embodiment, as Figures 1 to 8 shown in the figure, the ground of the microwave treatment tunnel 1 (or microwave shielding cabin) is a slope that gradually decreases from the middle to both sides. Both sides refer to the two sides perpendicular to the log conveying direction, and drain outlets are provided at the bottom of the slope. The slope is conducive to the water flow formed by the condensation of the water vapor evaporated from the logs 18 flowing to both sides of the microwave treatment tunnel 1 (or microwave shielding cabin), and the drain outlets can timely drain the converged water without leaving residual water. The slope can be a 3% gradient, and the drain outlets can be circular holes of 30 mm * 60 mm. Preferably, a detachable filter screen is provided inside the drain outlets. By replacing the filter screen in a timely manner, the drain outlets can be prevented from being blocked.

[0046] In this embodiment, as Figures 1 to 8As shown in the figure, a temperature monitoring device and a video monitoring device are provided inside the microwave treatment tunnel 1 (or the microwave shielding cabin). The temperature monitoring device includes an optical fiber temperature sensor and an infrared temperature sensor 16. The optical fiber temperature sensor is buried in the log 18 for monitoring the temperature inside the log 18. The infrared temperature sensor 16 is located inside the microwave treatment tunnel 1 (or the microwave shielding cabin) for measuring the surface temperature of the log 18. The video monitoring device includes a lighting lamp and a camera 15 located inside the microwave treatment tunnel 1 (or the microwave shielding cabin).

[0047] Specifically, the temperature monitoring device combines an optical fiber temperature sensor and an infrared temperature sensor 16. The optical fiber temperature sensor realizes contact temperature measurement. First, a drill is used to drill holes in the log 18 along the radial direction into the log 18 to bury the optical fiber temperature sensor to measure the internal temperature of the log 18. The infrared temperature sensor 16 realizes non-contact measurement of the surface of the log 18. The infrared temperature sensor 16 is installed between the upper and lower sets of microwave antennas 14. The infrared temperature sensor 16 is provided with strong electromagnetic field protection by a cutoff circular waveguide.

[0048] In this embodiment, as Figures 1 to 8 shown, the feed microwave suppressor 2 and the discharge microwave suppressor 3 can use the same type of microwave suppressor. Specifically, a common form on the market can be adopted. The following provides the specific structure of a common microwave suppressor. The microwave suppressor is made of stainless steel as a whole. Along the conveying direction, several vertical microwave suppression sheets 19 are provided at the top of the inner cavity of the microwave suppressor. The microwave suppression sheets 19 are stainless steel sheets, and the microwave suppression sheets 19 divide the inner cavity of the microwave suppressor into at least two resonant cavities. Microwave absorbing plates are attached to both the microwave suppression sheets 19 and the surface of the inner cavity of the microwave suppressor for absorbing microwave energy. Microwaves are absorbed by the microwave absorbing plates in each resonant cavity, and the microwave energy that is not completely absorbed is reflected by the microwave suppression sheets 19 and the stainless steel shell of the microwave suppressor, causing the microwave energy to continuously attenuate in multiple resonant cavities. The microwave absorbing plate can be a sheet-shaped silicon carbide plate, which has good microwave absorption performance and has the advantages of light weight and good heat resistance. The thickness of the silicon carbide plate is 30 - 50 mm.

[0049] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A log microwave quarantine treatment system, characterized in that: It includes a high-temperature steam inactivation chamber, a microwave treatment chamber and a log conveying line. The feed end of the microwave treatment chamber is connected with the discharge end of the high-temperature steam inactivation chamber. The log conveying line passes through the feed end and the discharge end of the high-temperature steam inactivation chamber, and the feed end and the discharge end of the high-temperature steam inactivation chamber in sequence. A steam nozzle is arranged in the high-temperature steam inactivation chamber. A steam exhaust port and a steam collecting hood are arranged on the top wall of the microwave treatment chamber. A cutoff waveguide is arranged in the steam exhaust port. The steam exhaust port covers the steam exhaust port at the inlet end of the steam collecting hood. The outlet end of the steam collecting hood is connected with the steam nozzle through a steam conveying pipeline. A suction device is arranged on the steam conveying pipeline.

2. A log microwave quarantine treatment system according to claim 1, characterized in that: The microwave processing chamber includes a microwave sealed cabin and a waveguide feeding device for feeding microwaves into the microwave sealed cabin. The feed end of the microwave sealed cabin is connected to the discharge end of the high-temperature steam inactivation chamber. The feed end and the discharge end of the microwave sealed cabin are respectively provided with shielding doors. The steam exhaust port and the steam collection hood are arranged on the top wall of the microwave sealed cabin.

3. A log microwave quarantine treatment system according to claim 1, characterized in that: The microwave treatment chamber includes a feed microwave suppressor, a microwave treatment tunnel, a discharge microwave suppressor and a waveguide feeding device for feeding microwaves into the microwave treatment tunnel. The feed end and the discharge end of the microwave treatment tunnel are respectively connected to the feed microwave suppressor and the discharge microwave suppressor, the feed microwave suppressor is connected to the discharge end of the high-temperature steam inactivation chamber, and the steam exhaust port and the steam collection hood are arranged on the top wall of the microwave treatment tunnel.

4. A log microwave quarantine treatment system according to any one of claims 1 to 3, characterized in that: An air supply hood is provided on the top wall of the high-temperature steam inactivation chamber, and the air supply hood includes an outer hood and an inner hood. The top wall of the outer hood is connected to the steam delivery pipeline, and the bottom wall of the inner hood is connected to the steam nozzle. The inner hood is located in the outer hood, and the side walls of the inner hood are evenly provided with air inlets in a circumferential direction.

5. A log microwave quarantine treatment system according to claim 4, characterized in that: The air inlet is a strip-shaped opening, and the strip-shaped opening is vertically arranged on the side wall of the inner cover.

6. A log microwave quarantine treatment system according to claim 5, characterized in that: The air suction device is an exhaust fan.

7. A log microwave quarantine treatment system according to claim 2 or 3, characterized in that: The waveguide feeding device comprises a microwave generator, a feeding waveguide and a microwave antenna which are connected in sequence. The microwave generator is installed outside a microwave shielding cabin or a microwave processing tunnel, and the microwave antenna is installed inside the microwave shielding cabin or the microwave processing tunnel.

8. A log microwave quarantine treatment system according to claim 7, characterized in that: A three-pin tuner is connected between the microwave generator and the feeding waveguide.

9. A log microwave quarantine treatment system according to claim 2 or 3, characterized in that: A microwave agitator is arranged in the microwave shielding cabin or the microwave processing tunnel.

10. A log microwave quarantine treatment system according to claim 2 or 3, characterized in that: Temperature monitoring equipment and video surveillance equipment are also installed in the microwave shielding cabin or microwave processing tunnel.

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