TW201511618A - Microwave heating and drying device - Google Patents

Abstract

A microwave heating and drying device includes a waveguide assembly, an impedance-matching microwave radiating antenna disposed under the waveguide assembly, a shielding shell covering the impedance-matching microwave radiating antenna, and a microwave absorbing device disposed in the shielding cover. Microwaves emitted by a microwave source are converted from linear polarization to circular polarization in the waveguide assembly, such that the uniformly-distributed field intensity is further generated in the shielding shell so as to perform quick and uniform heating and drying processing on an object to be heated that is placed on the microwave absorbing device.

Description

Microwave heating and drying device

The invention relates to a microwave heating and drying device for heating and drying a workpiece to be heated by using microwave.

The traditional heating method, whether it is heat radiation or conduction through air, is conducted from the heating source indirectly through the surface of the object to be heated to the inside of the object to be heated. Such heating method is poor for most heat conduction performance. For medium or metal powder, heating can only be carried out at a slow rate, and during heating, a relatively high proportion of the heat generated by the heating source is dissipated in the furnace for holding the object to be heated and consumed. Among the air scattered around the object to be heated, the energy utilization rate is extremely low.

In order to solve the above problem of low energy utilization when heating by radiation or conduction, the prior art has high-power microwaves for heating the object to be heated, such as the above medium, metal powder, or such as grain, frozen fresh Meat, etc., using the high-power microwave to force the water molecules in the object to be heated to vibrate, and the waiting heating object can be directly and quickly heated to inhibit the hatching of the insect eggs mixed in the grain or to thaw the frozen fresh meat. It has the advantage of high energy efficiency.

However, the greatest disadvantage of the above-mentioned prior art high-power microwave for heating the object to be heated is that the microwave field intensity distribution is uneven, that is, The hot spot and the cold spot are generated at different positions in one of the working chambers irradiated by the high-power microwave, thereby causing a problem that the object to be heated has uneven heating. In order to accommodate a region having a uniform field strength in the active cavity of the high-power microwave, only a small volume or a small portion of the object to be heated may be placed in the local uniform field strength region for heating each time; or all the waiting The heating object is rotated on a turntable to make the area of the field strength of the high-power microwave passing through the high-power microwave uniform and uneven, waiting for the heating object to be repeated, but this method can only be slowed down, but the problem cannot be completely solved and eliminated. The problem that high power microwaves cannot be uniformly heated.

In addition, in general, high-quality meat such as black squid sashimi or raw beef sashimi can be stored for a long time if it is between -40 ° C and -60 ° C until a customer reservation. Then, gradually warmed up to 0 °C from the first few days of the scheduled date of consumption, in preparation for serving on the table. However, this slow heating method takes three to four days. If the high-quality microwave is heated by the above-mentioned high-power microwave uneven heating method to heat the high-quality meat quickly, the partial area is easily caused. It is still in a frozen state, but some areas are exposed to blood and water due to overheating, which affects the taste of food.

In addition, in a general high-power microwave irradiation system, in order to avoid damage to the microwave source caused by reflected microwaves caused by impedance mismatch between the transmission line and the action cavity, most of the expensive microwaves are added between the microwave source and the active cavity. A microwave circulator or a unidirectional isolator, and a multi-stub tuner, thus make the high-power microwave system have the disadvantage of high hardware equipment cost.

In view of the problems of the prior art described above, it is an object of the present invention to provide a microwave heating and drying apparatus which can uniformly heat a workpiece to be heated and which is low in cost.

In order to achieve the above object, the technical means utilized by the present invention is such that a microwave heating and drying apparatus comprises: a waveguide assembly comprising a microwave mode converter, a lower waveguide, an upper waveguide, and two a side waveguide and an adjustable shorting piece, wherein a microwave mode converter converts the linear polarization microwave into a circularly polarized microwave or a longitudinally penetrating between the upper end and the lower end The circularly polarized microwave is converted into a linearly polarized microwave, and the lower waveguide is disposed at a lower end of the microwave mode converter, and an open end of the lower waveguide is docked with a lower end of the microwave mode converter. The waveguide is disposed at the upper end of the microwave mode converter, and a lower open end of the upper waveguide is opposite to the upper end of the microwave mode converter, and a second through hole is formed in the wall of the upper waveguide. The two through holes are located at a radial relative position of the upper waveguide, and the two side waveguides are mounted on the upper waveguide along the radial direction of the upper waveguide, and respectively correspond to Two-way hole of the waveguide, the adjustable short The sheet is hollow and mounted in an open end of one of the upper waveguides; an impedance matching microwave radiating antenna is in the shape of a cover and is sleeved at a lower open end of the lower waveguide; a shielded cover The shielding cover is formed by a metal material that can shield the microwave. The inside of the shielding cover forms a microwave action cavity, the shielding cover covers the impedance matching microwave radiation antenna, and a microwave absorption device is disposed on the shielding cover. The microwave acts in the cavity and is spaced correspondingly to the opening of one of the impedance matching microwave radiation antennas Below the end, the microwave absorbing device comprises a cavity and a dielectric cover, the cavity is made of a metal material that can shield the microwave, the cavity has an upper opening, and the dielectric cover is made of a microwave transparent material. The dielectric cover covers the opening above the receptacle.

The positioning spring is further disposed on the outer wall surface of the lower waveguide near the lower end of the lower waveguide, and the lower positioning spring is made of metal and is positioned within the impedance matching microwave radiation antenna. In the wall surface, the outer wall surface of the adjustable short-circuiting piece may further be provided with an upper positioning spring piece, and the upper positioning spring piece is made of metal material and is positioned on the inner wall surface of the upper waveguide tube.

The microwave absorbing device may further include a carrying platform that is mounted on the dielectric cover and that is adapted to impedance match the open end of the microwave radiating antenna.

The above-mentioned carrier can be a fixed platform or a movable conveying platform.

The above-mentioned carrying platform for the movable conveying platform may comprise two conveying rollers and a conveyor belt, and the two conveying rollers are spaced apart and arranged in parallel with each other, and the conveyor belt is wound around and coupled to the two conveying rollers.

A microwave permeable glass plate may be further disposed in the microwave action cavity of the shielding cover, and the glass plate is blocked between the microwave absorbing device and the impedance matching microwave radiation antenna.

The ring wall of the impedance matching microwave radiation antenna may have a step shape in which the diameter gradually changes.

The ring wall of the impedance matching microwave radiation antenna may be in the form of a step having an increasing diameter from the top to the bottom of the class, or from the top to the bottom of each class. The form of the gradual shrinking class.

The annular wall surface of the cavity of the microwave absorbing device may be provided with an inlet pipe and an outlet pipe, and the inlet pipe and the outlet pipe communicate with the inside of the cavity and the outside of the shielding cover.

The two through holes of the upper waveguide may be located at an angular interval of 90 degrees.

The two side waveguides can respectively connect a set of microwave sources with a matching load, and place a to-be-heated object on the carrying platform, and the microwaves emitted from the microwave source are in a TE10 linear polarization mode. The side waveguide enters the upper waveguide to become a TE11 linear polarization mode microwave, and the TE11 linear polarization mode microwave is gradually converted into a TE11 circular polarization mode microwave through the cavity of the microwave mode converter, the TE11 circle The polarization mode microwave can generate a uniformly distributed field strength in the microwave action cavity of the shielding cover, and all the microwave energy is used to quickly and uniformly the large volume and large area of the object to be heated provided on the stage. Under the heat irradiation treatment, other TE11 circularly polarized mode microwaves penetrating the object to be heated can be absorbed by the water contained in the lower tank.

By this design, the microwave heating and drying device of the invention can not only efficiently heat and dry the metal powder or the grain waiting for the heating object, but also uniformly heat a frozen fresh meat to greatly shorten the freezing. The warming time of fresh meat does not affect the taste of the fresh meat due to uneven heating, and ensures the economic value of the fresh meat. In addition, since the TE11 circularly polarized mode microwave reflected in the microwave action cavity of the shielding cover is gradually converted into the TE11 linear polarization mode microwave while passing through the cavity of the microwave mode converter, and is matched by the matching negative The absorption is absorbed to avoid damage to the microwave source. Therefore, the microwave heating and drying device of the present invention does not need to be equipped with an expensive microwave circulator or an isolator, and does not need to be equipped with a multi-column. The multi-stub tuner effectively reduces the cost of the cost.

10‧‧‧guide tube assembly

11‧‧‧Microwave mode converter

111‧‧‧ chamber

12‧‧‧ lower waveguide

121‧‧‧ Positioning reeds

13‧‧‧Upper waveguide

131‧‧‧through hole

14, 14'‧‧‧ side guide tube

15‧‧‧Adjustable short circuit

151‧‧‧Upper reed

20, 20A, 20B‧‧‧ impedance matching microwave radiation antenna

21, 21A, 21B‧‧‧

30, 30E‧‧‧Shielding cover

31, 31E‧‧‧ microwave action chamber

32E‧‧‧glass plate

40, 40D‧‧‧ microwave absorption device

41, 41D‧‧‧ 容容

411‧‧‧ water inlet

412‧‧‧Outlet

42, 42D, 42E‧‧‧ media cover

43, 43C‧‧‧bearing station

431C‧‧‧Transport roller

432C‧‧‧ conveyor belt

44‧‧‧ water

51‧‧‧ microwave source

52‧‧‧ Non-contact thermometer

61‧‧‧TE10 linear polarization mode microwave

62, 62'‧‧‧TE11 linear polarization mode microwave

63, 63', 64, 64', 65, 65'‧‧‧TE11 circular polarization mode microwave

71D‧‧‧ items to be heated

72E‧‧‧Fresh meat

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side cross-sectional view showing a first preferred embodiment of the present invention.

2 is a perspective view of the waveguide assembly and the impedance matching microwave radiation antenna of the present invention.

Figure 3 is a side cross-sectional view showing the first preferred embodiment of the present invention in use.

4 is a side cross-sectional view showing a second preferred embodiment of the present invention.

Figure 5 is a side cross-sectional view showing a third preferred embodiment of the present invention.

Figure 6 is a side cross-sectional view showing a fourth preferred embodiment of the present invention.

Figure 7 is a side cross-sectional view showing a fifth preferred embodiment of the present invention.

Figure 8 is a side cross-sectional view showing a sixth preferred embodiment of the present invention.

The technical means adopted by the present invention for achieving the intended purpose of the invention are further described below in conjunction with the drawings and preferred embodiments of the invention.

Referring to Figure 1, the microwave heating and drying apparatus of the present invention comprises a waveguide assembly 10, an impedance matching microwave radiating antenna 20, a shield housing 30 and a microwave absorbing device 40.

Referring to FIG. 2, the waveguide assembly 10 includes a microwave mode converter 11, a lower waveguide 12, an upper waveguide 13, two side waveguides 14, 14' and an adjustable short circuit 15 .

The microwave mode converter 11 has a hollow circular tube shape and has an upper end and a lower end. A cavity 111 is formed between the upper end and the lower end of the microwave mode converter 11. The microwave mode converter 11 can linearly polarize the microwave. Convert to circularly polarized microwaves or convert circularly polarized microwaves into linearly polarized microwaves.

The lower waveguide 12 is disposed at a lower end of the microwave mode converter 11. The lower waveguide 12 is a hollow circular tube body and has an upper open end and a lower open end. The lower waveguide 12 is above the lower waveguide 12 The open end is opposite to the lower end of the microwave mode converter 11, and the positioning spring 21 is disposed on the outer wall surface of the lower waveguide 12 near the lower end of the lower waveguide 12, and the lower positioning spring 121 is disposed. Made of metal.

The upper waveguide 13 is disposed at the upper end of the microwave mode converter 11. The upper waveguide 13 is a hollow circular tube body and has an upper open end, a lower open end and two through holes 131. The open end of the waveguide 13 is opposite to the upper end of the microwave mode converter 11. The two through holes 131 are formed at intervals along the wall of the upper waveguide 13, and the two through holes 131 are located at non-edges. The upper waveguide tube 13 is at a radial relative position. In a specific embodiment of the invention, the two through holes 131 are located at an angular interval of 90 degrees.

Each of the waveguides 14 and 14' is a hollow square tube, and the two side waveguides 14 and 14' are mounted on the upper waveguide 13 along the radial direction of the upper waveguide 13, and The two side waveguides 14 and 14' respectively correspond to the two through holes 131 of the upper waveguide 13, thereby communicating the inside of the upper waveguide 13, the chamber 111 of the microwave mode converter 11, and the lower waveguide. 12 internal.

The adjustable short circuit piece 15 is hollow and is attached to the upper guide An upper positioning spring 151 is disposed on the outer wall surface of the adjustable short circuit piece 15. The upper positioning spring 151 is made of a metal material, and the upper positioning spring 151 is supported by the upper guiding spring 151. The inner wall surface of the wave tube 13 can fix the relative position of the adjustable short circuit piece 15 and the upper waveguide tube 13, and the adjustable short circuit piece 15 can also be moved as needed to adjust the adjustable short circuit piece 15 at the upper guide. The position in the wave tube 13.

The impedance matching microwave radiation antenna 20 has a cover shape and is sleeved at an open end of the lower waveguide tube 12. The impedance matching microwave radiation antenna 20 has an upper open end, a lower open end and a ring wall 21, The open end of the impedance matching microwave radiation antenna 20 is sleeved on the lower open end of the lower waveguide 12, and the lower positioning reed 121 provided on the outer wall surface of the lower waveguide 12 abuts against the impedance matching microwave radiation The inner wall surface of the antenna 20 can fix the relative position of the impedance matching microwave radiation antenna 20 and the lower waveguide 12, and the impedance matching microwave ring antenna 20 has a stepped shape in which the aperture gradually changes. The impedance matching microwave radiation antenna 20 can perform geometrical dimensions according to actual antenna matching degrees, such as bandwidth, transmittance, reflectivity, etc., for different class numbers, caliber sizes of each class, and height of each class. Optimized design.

The shielding cover 30 is made of a metal material that can shield the microwave. The inside of the shielding cover 30 forms a microwave action cavity 31. The shielding cover 30 covers the impedance matching microwave radiation antenna 20 to match the impedance to the microwave radiation antenna. The lower end of the lower end 20 extends into the microwave action chamber 31 of the shield housing 30.

The microwave absorbing device 40 is disposed in the microwave action cavity 31 of the shielding cover 30, and is correspondingly located in the impedance matching microwave radiation antenna 20 Below the open end, the microwave absorbing device 40 includes a receiving slot 41, a dielectric cover 42 and a carrying platform 43. The receiving slot 41 is made of a metal material that can shield the microwave, and the receiving slot 41 has a In the upper opening, the cavity 41 is configured to receive the microwave-absorbing water 44, and the inlet wall 411 and the outlet pipe 412 are disposed on the wall surface of the 41-ring of the cavity, and the inlet pipe 411 and the outlet pipe 412 are connected to the cavity. The inside of the casing 41 and the outside of the shielding cover 30 are such that water in the receiving tank 41 can flow out of the receiving tank 41 via the water outlet pipe 412, and water for replenishment can flow into the receiving tank 41 via the inlet pipe 411. The media cover 42 is made of a microwave permeable material. The dielectric cover 42 is disposed on the cavity 41 and covers the opening of the cavity 41. The carrier 43 is further mounted on the On the dielectric cover 42, the corresponding impedance is matched to the open end of the microwave radiating antenna 20.

Referring to FIG. 3, the microwave heating and drying device of the present invention is used in such a manner that one side of the waveguide 14 is connected to a set of microwave sources 51 and the other side of the waveguide 14' is connected to a matching load. A heating object is placed on the carrying platform 43, the object to be heated may be, for example, metal powder, grain, frozen fresh meat, etc., the microwave emitted from the microwave source 51, in the TE10 linear polarization mode microwave 61 is corresponding The square side waveguide 14 enters the circular upper waveguide 13 to become the TE11 linear polarization mode microwave 62. In order to achieve an optimum coupling amount and minimum reflection, the microwave frequency and movement of the microwave source 51 can be adjusted. The position of the hollow adjustable shorting piece 15 is performed to perform TE10 linear polarization in the side waveguide 14, and the impedance matching between the mode microwave 61 and the TE11 linear polarization mode microwave 62 in the upper waveguide 13 is optimized; TE11 line pole optimized by coupling in the upper waveguide 13 The mode mode microwave 62 is gradually converted into the TE11 circular polarization mode microwave 63 after passing through the chamber 111 of the microwave mode converter 11, and further enters the lower waveguide tube 12 in the TE11 circular polarization mode microwave 64, and then the TE11. The circular polarization mode microwave 65 enters the impedance matching microwave radiation antenna 20, and the TE11 circular polarization mode microwave 65 can generate a uniformly distributed field in the microwave action cavity 31 of the shielding cover 30. Strongly, all the microwave energy is used for the rapid and uniform heating treatment of the large-volume, large-area object to be heated provided on the carrying platform 43, and most of the TE11 circular polarization penetrating the object to be heated The mode microwave 65 can be effectively absorbed by the water 44 in the lower tank 41, and the water 44 in the tank 41 can be circulated out and flowing from the outlet pipe 412 and the inlet pipe 411, and the water temperature can be controlled within a certain range. Through the hollow upper waveguide 13, the microwave mode converter 11, the lower waveguide 12 and the impedance matching microwave radiation antenna 20, the user can also measure the shielding cover from the far end by using a non-contact thermometer 52. 30, the temperature of the object to be heated in the microwave action chamber 31, and then feedback the parameter conditions of the respective processes for controlling the microwave heating according to the measured temperature, for example, the power level of the microwave source 51, and the start/stop operation of the microwave source 51 If the ratio is high or low, if the object to be heated is heated by a continuous process, the length of time during which the object to be heated receives the microwave through the microwave action chamber 31 can be additionally controlled.

Furthermore, when the TE11 circular polarization mode microwave 65 illuminates the object to be heated, if a part of the TE11 circular polarization mode microwave 65' is reflected in the microwave action cavity 31, and the microwave radiation antenna 20 and the lower electrode are matched via the impedance. When the wave tube 12 enters the chamber 111 of the microwave mode converter 11, The lower waveguide 12 is first entered into the TE11 circular polarization mode microwave 64', and then enters the microwave mode converter 11 in the TE11 circular polarization mode microwave 63', and then gradually converted into the TE11 linear polarization mode microwave 62'. Entering the upper waveguide 13, but the spatial radial field distribution of the reflected TE11 linear polarization mode microwave 62' is turned 90 degrees compared with the original TE11 linear polarization mode 62, so the TE11 line after the reflection The polarization mode microwave 62' does not return to the side waveguide 14 connected to the microwave source 51 to cause damage to the microwave source 51, but will enter the other side waveguide 14' connected to the matching load, and is matched by the matching load. Absorbing, therefore, the microwave heating and drying device of the present invention does not need to be equipped with an expensive microwave circulator or a unidirectional isolator, and does not need to be equipped with a multi-stub tuner. Achieve the purpose of reducing the cost of construction.

In addition, if the shielding cover 30 and the impedance matching microwave radiation antenna 20 are properly controlled by impedance matching without reflecting microwaves, the side waveguide 14' originally used to connect the matching load can also be used to connect a group of microwave sources. In this way, the total microwave power of the whole system can be increased to further heat the object to be heated; wherein the metal positioning spring 151 disposed on the outer wall surface of the adjustable short circuit piece 15 and the lower guide The metal lower positioning reed 121 provided on the outer wall surface of the wave tube 12 can prevent the microwaves 62, 62', 64, 64' in the upper waveguide 13 and the lower waveguide 12 from being leaked. The positioning reed 121 is similar to the design of the quick-release device, and allows the user to quickly replace the impedance-matching microwave radiation antenna 20.

In order to allow the fixed power microwave source 51 to reach the maximum unit area for a particular object to be heated in an area of suitable area size The microwave irradiation heating of the accumulated power can be used in combination with the impedance matching microwave radiation antenna 20 having a suitable irradiation area; as shown in the first preferred embodiment of the present invention shown in FIG. 1, the impedance matching microwave ring antenna 20 of the ring wall 21 In the second preferred embodiment of the present invention, as shown in FIG. 4, the ring wall 21A of the impedance matching microwave radiation antenna 20A is also viewed from top to bottom. The gradual increase in the class shape of the class, but the amplitude variation of each stage of the impedance matching microwave radiating antenna 20A of the second preferred embodiment is larger than that of the impedance matching microwave radiating antenna 20 of the first preferred embodiment. The amplitude variation range is small; as shown in Fig. 5, in the third preferred embodiment of the present invention, the ring wall 21B of the impedance matching microwave radiation antenna 20B has a stepped shape in which the diameters of the upper and lower stages are tapered.

Moreover, in the first to third preferred embodiments of the present invention as shown in FIG. 1, FIG. 4 and FIG. 5, the loading platform 43 is a fixed platform, and the object to be heated is in a batch processing manner. First, a batch of the object to be heated is placed on the carrying platform 43 in the shielding cover 30, and then taken out after heating and drying, and placed in the next batch of objects to be heated; further see the first embodiment of the present invention shown in FIG. In a preferred embodiment, the object to be heated is heated and dried by a continuous process, and the stage 43C is a movable transport platform such that the waiting heating object can be placed from one side of the stage 43C. On the carrying platform 43C, the carrying platform 43C drives the waiting heating object to move through the lower closing end of the impedance matching microwave radiating antenna 20 to be irradiated by the TE11 circular polarization mode microwave 65. Heating is then carried out to the other side of the stage 43C for removal. Specifically, the carrying platform 43C includes two conveying rollers 431C and a conveyor belt 432C. The two conveying rollers 431C are spaced apart from each other and disposed parallel to each other. The conveyor belt 432C is wound around and coupled to the two conveying rollers 431C, and the object to be heated is It is disposed on the conveyor belt 432C to move.

Referring to FIG. 7 , in the fifth preferred embodiment of the present invention, the microwave absorbing device 40D can also omit the loading platform. The cavity 41D of the microwave absorbing device 40D is filled with liquid or mud. The object is heated, and the tank 41D is connected to a vacuum pumping system, so that the TE11 circularly polarized mode microwave 65 can be irradiated through the medium cover 42D and heat and dry the liquid or mud in the tank 41D. The object 71D is heated.

Referring to the sixth preferred embodiment of the present invention shown in FIG. 8, a microwave transparent glass plate 32E is further disposed in the microwave action cavity 31E of the shielding cover 30E, and the glass plate 32E is blocked by the microwave. Between the absorption device 40E and the impedance matching microwave radiation antenna 20, a frozen fresh meat 72E can be placed on the dielectric cover 42E of the microwave absorption device 40E to be heated by microwave irradiation. By using the microwave heating and drying device of the present invention, each portion of the frozen raw meat 72E can be uniformly heated to greatly shorten the heating time of the frozen fresh meat 72E without affecting the heating unevenness. The taste of raw fresh meat 72E ensures the economic value of the fresh meat 72E.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. The present invention has been described above by way of preferred embodiments, but is not intended to limit the present invention, and any skilled person skilled in the art. According to the invention, without departing from the scope of the technical solution of the invention Technical Substantials Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

10‧‧‧guide tube assembly

11‧‧‧Microwave mode converter

111‧‧‧ chamber

12‧‧‧ lower waveguide

121‧‧‧ Positioning reeds

13‧‧‧Upper waveguide

131‧‧‧through hole

14‧‧‧ side guide tube

15‧‧‧Adjustable short circuit

151‧‧‧Upper reed

20‧‧‧Imped matching microwave radiation antenna

21‧‧‧Circle

30‧‧‧Shield housing

31‧‧‧Microwave action chamber

40‧‧‧Microwave absorption device

41‧‧‧ 容容

411‧‧‧ water inlet

412‧‧‧Outlet

42‧‧‧Media cover

43‧‧‧Loading station

44‧‧‧ water

Claims (12)

A microwave heating and drying device comprising a waveguide assembly, an impedance matching microwave radiation antenna, a shielding cover and a microwave absorbing device, wherein: the waveguide assembly comprises a microwave mode converter, a lower waveguide, An upper waveguide, a two-side waveguide and an adjustable short-circuiting piece, wherein a microwave mode converter vertically extends between the upper end and the lower end to form a chamber, and the microwave mode converter can convert the linear polarization microwave Converting the circularly polarized microwave or converting the circularly polarized microwave into a linearly polarized microwave, the lower waveguide is disposed at a lower end of the microwave mode converter, and the open end of the lower waveguide is connected to the microwave mode converter The lower end is connected to each other, and the upper waveguide is disposed at the upper end of the microwave mode converter, and a lower open end of the upper waveguide is opposite to the upper end of the microwave mode converter, and the upper waveguide is on the wall of the waveguide Intersecting a two-way hole, the two-way hole is located at a position opposite to a radial direction of the upper waveguide, and the two-side waveguide is mounted on the upper waveguide along a radial direction of the upper waveguide Upper and corresponding respectively a second through hole, the adjustable short circuit piece is hollow and installed in an open end of one of the upper waveguides; the impedance matching microwave radiation antenna is in a cover shape, and is sleeved on the lower waveguide The shielding cover is made of a metal material that can shield the microwave, the inside of the shielding cover forms a microwave action cavity, and the shielding cover covers the impedance matching microwave radiation antenna; the microwave absorption device is disposed on the shielding The microwave absorbing cavity of the outer cover is spaced below the lower open end of one of the impedance matching microwave radiation antennas, and the microwave absorbing device comprises a cavity and a dielectric cover, the cavity The metal material of the microwave can be shielded, the cavity has an upper opening, and the dielectric cover is made of a microwave transparent material, and the dielectric cover covers the opening above the cavity. The microwave heating and drying device of claim 1, wherein the outer wall of the lower waveguide is further disposed adjacent to the lower end of the lower waveguide, and the positioning spring is metal. The material is placed on the inner wall surface of the impedance matching microwave radiation antenna, and an outer positioning spring is further disposed on the outer wall surface of the adjustable short circuit piece. The upper positioning spring is made of metal material and is positioned on the upper guiding wave. The inner wall of the tube. The microwave heating and drying device of claim 2, wherein the microwave absorbing device further comprises a carrying platform that is mounted on the dielectric cover and that is adapted to impedance match the open end of the microwave radiating antenna. The microwave heating and drying device according to claim 3, wherein the carrier of the microwave absorbing device is a fixed platform. The microwave heating and drying device according to claim 3, wherein the carrying platform of the microwave absorbing device is a movable conveying platform. The microwave heating and drying device of claim 5, wherein the carrier of the microwave absorbing device comprises two conveying rollers and a conveyor belt, the two conveying rollers are spaced apart and arranged in parallel with each other, and the conveyor belt is wound around and coupled to The two conveying rollers. The microwave heating and drying device according to any one of claims 3 to 6, wherein a microwave-permeable glass plate is further disposed in the microwave action chamber of the shielding cover, and the glass plate is blocked by the microwave absorption device. Between the impedance matching microwave radiating antenna. The microwave heating and drying device according to any one of claims 1 to 7 The ring wall of the impedance matching microwave radiation antenna has a step shape in which the diameter gradually changes. The microwave heating and drying device according to claim 8, wherein the ring wall of the impedance matching microwave radiation antenna has a stepped shape in which the diameters of the upper and lower stages gradually increase. The microwave heating and drying apparatus according to claim 8, wherein the ring wall of the impedance matching microwave radiation antenna has a stepped shape in which the diameters of the upper and lower stages are tapered. The microwave heating and drying device according to any one of claims 1 to 7, wherein the annular wall surface of the cavity of the microwave absorbing device is provided with an inlet pipe and an outlet pipe, and the inlet pipe and the outlet pipe are connected to each other. The inside of the slot and the outside of the shield housing. The microwave heating and drying apparatus according to any one of claims 1 to 7, wherein the two through holes of the upper waveguide are located at an angular interval of 90 degrees.