Microwave drying equipment

Abstract

The present application discloses a microwave drying device, comprising: a barrel having a storage space for accommodating granular materials; a feeding mechanism for conveying granular materials, the feeding mechanism being connected to the barrel; a turning mechanism being connected to the barrel and performing feeding and turning processing on the granular materials in the barrel; and a microwave drying mechanism being arranged on the barrel and performing drying processing on the granular materials in the barrel. Compared with the prior art, the present application uses microwaves as a heating source to dry the granular materials at a relatively low heating temperature, and has the advantages of energy saving, high efficiency, less heat dissipation to the environment, and less air pollution.

Description

Technical Field

[0001] The present application belongs to the technical field of microwave drying, and specifically relates to a microwave drying device. Background Art

[0002] In the production and processing of plastic products, if the plastic particles contain a high amount of water, it will have a great impact on the dimensional accuracy and product quality of the parts, and even cause the parts to be scrapped. Therefore, before the parts are formed, the plastic particles with strong water absorption need to be dried.

[0003] In order to reduce the moisture in the particles, the industry generally adopts drying measures before injection molding. Usually, electric heating tube ovens or hot air ovens are used to heat the air in the ovens with electric heating wires, and blowers are used to blow the generated heat into the drying device to dry plastic and other granular materials. However, there are technical defects such as excessive power consumption and low energy utilization; long drying cycle and low production efficiency; high heating temperature for particles, which destroys the original properties of particles; and continuous discharge of heat and dust to the external environment during the drying process.

[0004] Microwave drying is a new drying method. During drying, microwave energy directly acts on the medium molecules and is converted into heat energy. Since microwaves have penetrating properties, the medium is heated both inside and outside at the same time, and no external heat conduction is required, so the heating speed is very fast and the drying speed can be greatly shortened. At the same time, regardless of the shape of the object, since the medium of the object is heated both inside and outside at the same time, the temperature difference between the inside and outside of the material is small, and the heating is uniform. The situation of external coking and internal generation in conventional heating will not occur, which greatly improves the drying quality. Therefore, the present application proposes a microwave drying device that uses microwaves as a heating source to dry granular materials at a relatively low heating temperature, and has the characteristics of energy saving, high efficiency, low heat dissipation to the environment, and low air pollution. Summary of the invention

[0005] In view of the above-mentioned shortcomings or deficiencies of the prior art, the technical problem to be solved by the present application is to provide a microwave drying device.

[0006] To solve the above technical problems, this application is implemented through the following technical solutions:

[0007] A microwave drying device comprises: a barrel having a storage space for accommodating granular materials; a feeding mechanism for conveying granular materials, the feeding mechanism being connected to the barrel; a turning mechanism connected to the barrel and performing feeding and turning processing on the granular materials in the barrel; and a microwave drying mechanism, which is arranged on the barrel and performs drying processing on the granular materials in the barrel.

[0008] Furthermore, in the above-mentioned microwave drying equipment, the material turning mechanism includes: a blowing pipe, a positive pressure conveying mechanism and an air source conveying channel that are transparently arranged at the top and bottom; the blowing pipe is arranged in the barrel and connected to the bottom of the barrel, and a plurality of feeding holes are also provided on the blowing pipe; the positive pressure conveying mechanism is connected to the bottom of the blowing pipe through the air source conveying channel.

[0009] Furthermore, in the above-mentioned microwave drying equipment, a cover is also provided on the blowing pipe, and the cover is arranged close to the bottom of the blowing pipe and above the feeding hole.

[0010] Furthermore, in the above-mentioned microwave drying equipment, the cover is detachably connected to the blowing pipe and can slide up and down along the blowing pipe.

[0011] Furthermore, in the above-mentioned microwave drying equipment, a protrusion structure is also provided on the blowing pipe, wherein the protrusion structure is arranged between the feed hole and the cover.

[0012] Furthermore, in the above-mentioned microwave drying equipment, the cover is a hat-shaped cover.

[0013] Furthermore, in the above-mentioned microwave drying equipment, a bulk material tray is also installed on the top of the blowing pipe, and a particle material dispersion channel is also reserved between the top of the blowing pipe and the bulk material tray.

[0014] Furthermore, in the above-mentioned microwave drying equipment, the bulk material tray is detachably mounted on the top of the blowing pipe via a bracket.

[0015] Furthermore, in the above-mentioned microwave drying equipment, the bulk material tray is made of glass or ceramic material.

[0016] Furthermore, in the above-mentioned microwave drying equipment, the surface of the bulk material tray is provided with a metal nano coating.

[0017] Furthermore, in the above-mentioned microwave drying equipment, a discharge channel is also provided at the bottom of the blowing pipe.

[0018] Furthermore, in the above-mentioned microwave drying equipment, the bottom of the blowing pipe is connected to the first port of the three-way electric ball valve, the second port of the three-way electric ball valve is connected to the gas source delivery channel, and the third port of the three-way electric ball valve is connected to the discharge channel.

[0019] Furthermore, in the above-mentioned microwave drying equipment, the bottom of the blowing pipe is connected to the first port of the three-way electric ball valve through a connecting pipeline.

[0020] Furthermore, in the above-mentioned microwave drying equipment, the connecting pipeline has a horizontal section.

[0021] Furthermore, in the above-mentioned microwave drying equipment, the feeding mechanism includes: a negative pressure conveying mechanism, a negative pressure conveying channel connected to the negative pressure conveying mechanism, and a feeding hopper, wherein the negative pressure conveying channel is also connected to the air outlet of the barrel, and the feeding hopper is connected to the feeding port of the barrel through a feeding pipe.

[0022] Furthermore, in the above-mentioned microwave drying equipment, the feeding mechanism also includes a negative pressure filter box, and the negative pressure filter box is connected and arranged on the negative pressure conveying channel.

[0023] Furthermore, in the above-mentioned microwave drying equipment, a wire mesh arranged in a horizontal, vertical or inclined manner is provided in the negative pressure filter box.

[0024] Further, in the above-mentioned microwave drying equipment, the wire mesh divides the negative pressure filter box into a first cavity and a second cavity, wherein a first interface arranged on the first cavity is connected to a first negative pressure delivery sub-channel in the negative pressure delivery channel; and a second interface arranged on the second cavity is connected to a second negative pressure delivery sub-channel in the negative pressure delivery channel.

[0025] Furthermore, in the above-mentioned microwave drying equipment, the negative pressure filter box is made of a transparent material.

[0026] Furthermore, in the above-mentioned microwave drying equipment, the negative pressure conveying mechanism and the positive pressure conveying mechanism use the same blower, wherein the negative pressure conveying mechanism is connected to the positive pressure output port of the blower through a negative pressure conveying channel, and the positive pressure conveying mechanism is connected to the negative pressure output port of the blower through an air source conveying channel.

[0027] Furthermore, in the above-mentioned microwave drying equipment, an exhaust pipe is also provided on the barrel, and a one-way check valve is also configured at the outlet of the exhaust pipe.

[0028] Furthermore, in the above-mentioned microwave drying equipment, the one-way check valve includes an outer cage and a sphere, wherein the outer cage includes a accommodating portion and a first cage opening, the accommodating portion has a flow channel through the first cage opening and the hole arranged on the outer cage, and the accommodating portion is used to accommodate the sphere; the sphere is placed in the accommodating portion, and the outer diameter of the sphere is slightly larger than the mouth size of the first cage opening.

[0029] Furthermore, in the above-mentioned microwave drying equipment, one end of the outer cage has a first conical structure, and a first cage opening is arranged on the first conical structure; the other end of the outer cage has a second conical structure, and a second cage opening is also arranged on the second conical structure, wherein the mouth size of the second cage opening is slightly smaller than the outer diameter of the sphere; the first conical structure and the second conical structure are connected to form the outer cage, or the first conical structure and the second conical structure are connected to form the outer cage.

[0030] Furthermore, in the above-mentioned microwave drying equipment, the cone surface angle of the first cone structure is 90-2α°, and the rolling inclination angle α is 10-20°, wherein the rolling inclination angle α is the radial angle between the gravity direction and the cage edge of the first cone structure.

[0031] Furthermore, in the above-mentioned microwave drying equipment, the sphere is one of a hollow rubber ball, a lightweight high-density sponge ball, a Teflon ball, a glass ball or a steel ball.

[0032] Furthermore, in the above-mentioned microwave drying equipment, the inner corner where the exhaust pipe is connected to the first cage opening is a smooth annular chamfer, wherein the annular chamfer forms an inner conical surface that is convenient for closely fitting with the surface of the sphere.

[0033] Furthermore, in the above-mentioned microwave drying equipment, the exhaust pipe and the air outlet are both provided with a tube extended inwardly, wherein the aspect ratio of the tube is greater than or equal to 2.

[0034] Furthermore, in the above-mentioned microwave drying equipment, the microwave drying mechanism includes a microwave magnetron, and the microwave magnetron is installed on the barrel through a waveguide port.

[0035] Furthermore, in the above-mentioned microwave drying equipment, the bottom of the waveguide opening is covered with a Teflon plate, and the waveguide opening is fixed to the cover on the top of the barrel through the Teflon plate.

[0036] Furthermore, the above-mentioned microwave drying equipment further includes a temperature sensor, and the temperature sensor is arranged on the upper part of the barrel.

[0037] Furthermore, the above-mentioned microwave drying equipment further includes a first material level sensor and a second material level sensor, and the first material level sensor and the second material level sensor are respectively arranged at the upper part and the lower part of the barrel.

[0038] Furthermore, the above-mentioned microwave drying equipment also includes a control electrical box, which is electrically connected to the microwave magnetron, the three-way electric ball valve, the first three-way valve, the second three-way valve, the positive pressure conveying mechanism and the negative pressure conveying mechanism respectively.

[0039] Furthermore, the above-mentioned microwave drying equipment further includes a mounting frame with casters, and the mounting frame is used to install the barrel.

[0040] Compared with the prior art, this application has the following technical effects:

[0041] The present invention has low energy consumption and high energy efficiency. It utilizes the characteristics of microwave heating from the inside of water-containing particles and cooperates with a blower to circulate the granular material. It also uses microwaves as a heating source to dry the granular material at a relatively low heating temperature, which is energy-saving, high-efficiency, less heat dissipation to the environment, and less air pollution.

[0042] The negative pressure filter box provided in the feeding mechanism of the present application can increase the area to reduce the velocity of the negative pressure airflow, and can precipitate fine particles and other materials to prevent the fine particles and other materials from being sucked into the exhaust fan and damaging its blades, thereby ensuring the stable operation of the entire feeding system;

[0043] The negative pressure conveying mechanism and the positive pressure conveying mechanism in the present application can share a blower, which can realize the air source conveying and negative pressure extraction operation, reducing the investment cost of using separate equipment;

[0044] The present invention has a short drying time and high working efficiency. The present invention can shorten the drying time of the traditional externally heated pellet material drying method by about half. According to experimental measurements, the drying effect required by production can be achieved by using the drying equipment of the present invention in 40 minutes to 1 hour.

[0045] The drying process temperature of this application is relatively low. Due to the good room temperature wind or the circulation of gas such as N2, the particle drying process temperature is moderate, basically below 100°C, and the physical and chemical properties of the particles are not damaged;

[0046] The overall structure of this application is compact, the floor space is small, the equipment cost is not high, and it has obvious advantages over traditional hot air drying equipment;

[0047] This application is not only applicable to the plastic products industry, but can also be used for drying granular materials in other industries, such as chemical fiber, textile, medicine, food, feed and other industries, and is also applicable to production processes that require drying granular materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0049] Figure 1 :The three-dimensional microwave drying equipment of this application Figure 1 ;

[0050] Figure 2 :The three-dimensional microwave drying equipment of this application Figure 2 ;

[0051] Figure 3 : Longitudinal section of the microwave drying equipment of the present application Figure 1 ;

[0052] Figure 4 : Longitudinal section of the microwave drying equipment of the present application Figure 2 ;

[0053] Figure 5 : The working principle diagram of the turning and drying of the granular material in this application;

[0054] Figure 6 : A schematic diagram of the structure of the microwave drying mechanism in this application;

[0055] Figure 7 : A schematic diagram of the structure of the blowing pipe in this application;

[0056] Figure 8 : The three-dimensional structure of the one-way check valve in this application Figure 1 ;

[0057] Fig. 9 :like Figure 8 The usage status of the structure shown Figure 1 ;

[0058] Fig.10 :like Figure 8 The usage status of the structure shown Figure 2 ;

[0059] Fig.11 : The three-dimensional structure of the one-way check valve in this application Figure 2 ;

[0060] Fig.12 :like Fig.11 A usage state diagram of the structure;

[0061] Fig.13 : The three-dimensional structure of the one-way check valve in this application Figure 3 . DETAILED DESCRIPTION

[0062] The concept, specific structure and technical effects of the present application will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present application.

[0063] like Figures 1 to 5As shown, the microwave drying equipment of this embodiment includes: a barrel 02, which has a accommodating space for accommodating granular materials; a feeding mechanism, which is used to convey granular materials and is connected to the barrel 02; a turning mechanism, which is connected to the barrel 02 and performs feeding and turning processes on the granular materials in the barrel 02; and a microwave drying mechanism 13, which is arranged on the barrel 02 and performs drying processes on the granular materials in the barrel 02.

[0064] The barrel 02 includes a cylindrical structure 0201 disposed at the top and a funnel-shaped structure 0202 disposed at the bottom, the cylindrical structure 0201 and the funnel-shaped structure 0202 are smoothly connected, and the barrel 02 is preferably an integrally formed structure. The inclination angle of the funnel-shaped structure 0202 is preferably about 45°.

[0065] In this embodiment, the barrel 02 is preferably made of stainless steel, and the blowing tube 03 is also preferably made of stainless steel. The barrel 02 may also be made of a glass tube. Although the cost of opening a hole in a glass tube is higher, the wear resistance is better.

[0066] This embodiment is also provided with a mounting frame 01, and the mounting frame 01 is used to mount the barrel 02. The barrel 02 can be uprightly seated on the mounting frame 01, and a plurality of casters are installed at the lower end of the mounting frame 01 for moving the equipment.

[0067] The upper part of the barrel 02 is also provided with an openable lid 0204, and after the lid 0204 is closed, the barrel 02 forms a sealed space.

[0068] like Figure 6 As shown, the microwave drying mechanism 13 includes a microwave magnetron 1301 , and the microwave magnetron 1301 is installed on the barrel 02 through a waveguide port 1302 .

[0069] Furthermore, the bottom of the waveguide port 1302 is also covered with a Teflon plate 1303, and the waveguide port 1302 is fixed to the cover 0204 at the top of the barrel 02 through the Teflon plate 1303. Furthermore, the Teflon plate 1303 is fixed to the Teflon plate 1303 disposed inside the cover 0204 by screws. The Teflon plate 1303 covers and protects the waveguide port 1302 from the pressure shock of the external air changes, and can prevent foreign matter from entering and damaging the microwave magnetron 1301.

[0070] Of course, in order to obtain a better drying effect, the microwave drying mechanism 13 can be provided in plurality, and it can be provided on the side or bottom of the upper part (cylindrical structure 0201) of the barrel 02. Of course, the specific arrangement can be uniform or non-uniform, such as uniformly arranging a plurality of microwave drying mechanisms 13 along the circumference of the circular structure. Among them, the waveguide port 1302 is arranged toward the surface of the granular material. For example, when the microwave drying mechanism 13 is arranged at the top of the barrel 02, the waveguide port 1302 is arranged downward and toward the upper surface of the granular material.

[0071] like Figures 1 to 5 as well as Figure 7 As shown, the material turning mechanism includes: a blowing pipe 03 that is transparent at the top and bottom, a positive pressure conveying mechanism and an air source conveying channel 06; the blowing pipe 03 is arranged in the barrel 02 and is connected to the bottom of the barrel 02, and a plurality of feeding holes 0301 are also provided on the wall of the blowing pipe 03 near the bottom; the positive pressure conveying mechanism is connected to the bottom of the blowing pipe 03 through the air source conveying channel 06.

[0072] In this embodiment, pneumatic blowing is adopted from the lowest point of the blowing tube 03 to blow upwards in sequence, and the upper granular materials are sequentially moved downwards to realize the sequential circulation and turning of the granular materials. At the same time, the granules are heated in cooperation with the microwave drying mechanism 13 described above. The characteristics of microwaves being sensitive to polar molecules and preferentially heating the moisture in the granules are utilized to heat the granules from the inside to drive out the moisture. The granular materials are stirred and the heat is evenly dissipated in cooperation with pneumatic stirring. The airflow exchanges gas inside and outside the barrel 02 through the positive pressure conveying mechanism. After multiple cycles, the granular materials to be dried are dehydrated and the drying effect is achieved under the working condition of suitable temperature (below 100°C).

[0073] The positive pressure conveying mechanism is installed on the lower layer of the mounting frame 01, with the air inlet facing downward to prevent the inhalation of foreign matter. The positive pressure conveying mechanism can use a blower 07, and preferably a turbo blower, and the wind pressure is less than 50Kpa to meet the requirements. The pneumatic stirring of the granular material is more energy-saving, efficient, less heat dissipation to the environment, and less air pollution.

[0074] In this embodiment, the positive pressure delivery mechanism and the negative pressure delivery mechanism described below can use the same blower 07, wherein the negative pressure delivery mechanism is connected to the positive pressure output port 0701 of the blower 07 through the negative pressure delivery channel, and the positive pressure delivery mechanism is connected to the negative pressure output port 0702 of the blower 07 through the air source delivery channel 06. This embodiment only illustrates the case where the negative pressure delivery mechanism and the positive pressure delivery mechanism use the same blower. Figure 3 and Figure 4Of course, in specific implementation, the positive pressure conveying mechanism and the negative pressure conveying mechanism may also adopt different structures respectively. When different structures are adopted, the positive pressure conveying mechanism may adopt N2 gas source, etc. in addition to adopting the blower 07 mentioned above to perform pneumatic turning of materials.

[0075] Furthermore, if Figure 3 , Figure 4 and Figure 5 As shown, an internal threaded tube 0203 is welded to the bottom of the barrel 02, and the bottom outer wall of the blowing tube 03 is provided with an external threaded structure matching with the threaded tube. The blowing tube 03 and the barrel 02 are fixed by the coordinated use of the external threaded structure and the internal threaded tube 0203.

[0076] The blowing pipe 03 is preferably fixed at the center of the barrel 02. The blowing pipe 03 adopts a structure in which air enters from the bottom, the wall of the pipe near the bottom is opened for feeding, and the top outlet is used for discharging. The feeding hole 0301 is a vertical rectangle, and the number of holes is 4. Figure 7 The structure and number of the above-mentioned feed holes 0301 are only one of the possible implementation methods, and do not limit the protection scope of the present application. Those skilled in the art can adopt other structures or other numbers of feed holes 0301 according to actual needs.

[0077] like Figure 7 As shown, the blowing tube 03 is further provided with a protruding structure 0305, wherein the protruding structure 0305 is arranged between the feeding hole 0301 and the cover 0304. The protruding structure 0305 can prevent the cover 0304 from being excessively adjusted downward to contact the inner wall of the funnel-shaped structure 0202, thereby closing the feeding hole 0301.

[0078] like Figure 7 As shown, the blowing tube 03 is also provided with a cover 0304, which is arranged near the bottom of the blowing tube 03 and above the feeding hole 0301. The cover 0304 is used to disperse the granular material to the feeding hole 0301, so that the granular material in the barrel 02 can evenly enter the blowing tube 03 from all sides through the feeding hole 0301, but the height of the granular material entering the blowing tube 03 will not exceed the upper end of the feeding hole 0301.

[0079] The cover 0304 is detachably connected to the blowing tube 03 and can slide up and down along the blowing tube 03 to adjust the distance between the lower edge of the cover 0304 and the bottom of the funnel-shaped structure 0202, thereby controlling the speed at which the granular material enters the blowing tube 03.

[0080] Furthermore, the cover 0304 is a hat-shaped cover, wherein the cover 0304 is preferably made of non-metallic materials, preferably heat-resistant plastics or glass. The angle between the inclined surface of the hat-shaped cover and the horizontal plane is preferably 45°, and the inclined surface and the surface of the corresponding funnel-shaped structure 0202 are arranged perpendicular to each other. The lower end of the central circular ring of the hat-shaped cover is welded with a hat-shaped edge, which is sleeved on the blowing pipe 03 through the central ring and fixed on the blowing pipe 03 with screws.

[0081] In this embodiment, if Figure 7 As shown, a bulk material tray 0303 is also installed on the top of the blowing pipe 03, wherein a granular material dispersing channel is reserved between the top of the blowing pipe 03 and the bulk material tray 0303. The bulk material tray 0303 is preferably an arc-shaped structure, wherein a small hole for installation and fixing is configured in the center of the bulk material tray 0303.

[0082] The bulk material tray 0303 is detachably mounted on the top of the blowing tube 03 through a bracket 0302. The bulk material tray 0303 is mounted on the top of the bracket 0302 through the holes configured therein to ensure that there is a space distance between the bulk material tray 0303 and the top of the blowing tube 03, which is reserved as a dispersion channel for the granular material.

[0083] like Figure 7 As shown, a circular ring is provided at the bottom of the bracket 0302, and the top of the herringbone bracket 0302 has a section of thread inserted into the hole of the bulk material tray 0303 and fixed by a nut. The circular ring is inserted into the top of the blowing tube 03, and the side can be locked on the blowing tube 03 with a set screw.

[0084] The bulk material tray 0303 is made of glass or ceramic material. Glass and ceramic materials are hard and wear-resistant and do not block microwaves. When drying and turning materials, they are used to disperse the granular materials blown up from the blowing tube 03 to prevent the granular materials from directly impacting the microwave drying mechanism 13. When adding materials into the blowing tube 02 by wind force, the bulk material tray 0303 can disperse the impact force of the incoming particles. The bulk material tray 0303 at the opening of the blowing tube 03 can also prevent the granular materials from entering the blowing tube 03 from the upper opening, causing the blowing tube 03 to be blocked due to excessive accumulation of materials.

[0085] Of course, a metal nano-coating can also be provided on the surface of the bulk material tray 0303, which is used to disperse the granular material blown up from the blowing tube 03 when drying and turning the material, and prevent the particles from rushing toward the microwave drying mechanism 13; when adding material into the blowing tube 02 by wind force, the bulk material tray 0303 provided with a metal nano-coating can disperse the impact force of the incoming particles, and the bulk material tray 0303 at the mouth of the blowing tube 03 can also prevent the granular material from entering the blowing tube 03 from the upper mouth, causing the granular material accumulated in the blowing tube 03 to be too high and blocked, etc.

[0086] In this embodiment, a discharge channel 08 is also provided at the bottom of the blowing pipe 03 .

[0087] Furthermore, the bottom of the blowing pipe 03 is connected to the first port A of the three-way electric ball valve 05, the second port B of the three-way electric ball valve 05 is connected to the gas source delivery channel 06, and the third port C of the three-way electric ball valve 05 is connected to the discharge channel 08. The three-way electric ball valve 05 is used to control the turning and discharging of materials.

[0088] The bottom of the blowing pipe 03 is connected to the first port A of the three-way electric ball valve 05 through a connecting pipe 04. The connecting pipe 04 has a horizontal section, which can prevent excessive granular materials from falling into the three-way electric ball valve 05 and accumulating, thus affecting the switching opening and closing of the three-way electric ball valve 05.

[0089] Furthermore, a first three-way valve 0501 is provided on the gas source delivery channel 06, and the opening and closing of the gas source delivery channel 06 are controlled by operating the first three-way valve 0501.

[0090] In this embodiment, the barrel 02 is also provided with an exhaust pipe 11, wherein the exhaust pipe 11 is also provided with a one-way check valve 12. The connection between the exhaust pipe 11 and the one-way check valve 12 can be made by welding, plugging, bonding and other existing connection methods. When negative pressure feeding is completed, the negative pressure conveying mechanism is closed, the exhaust pipe 11 is opened, and the discharge operation can be carried out by gravity and / or the valve provided at the discharge port; when negative pressure feeding is carried out, the exhaust pipe 11 is closed.

[0091] The above-mentioned air outlet 09 and exhaust pipe 11 are arranged parallel to the waveguide port 1302 of the microwave drying mechanism 13. The air outlet 09 and the exhaust pipe 11 are both provided with a pipe that is extended inward, wherein the aspect ratio of the pipe is greater than or equal to 2, so as to reduce the microwave from being reflected from the inside of the pipe to the outside of the barrel 02 and leaking out. According to actual measurements during the prototype operation, when the aspect ratio of the pipe is greater than or equal to 2, the microwave instrument can hardly detect microwave leakage at the pipe port. In the actual measurement state of this embodiment, the diameter of the pipe is 50 mm and the length is 120 mm, but when the pipe diameter is thickened, the aspect ratio may need to be increased.

[0092] like Figures 8 to 13 As shown, the one-way check valve 12 includes an outer cage A10 and a ball A20, wherein the outer cage A10 includes a accommodating portion and a first cage opening A11, and the accommodating portion has a flow channel through the first cage opening A11 and a hole A101 arranged on the outer cage A10, and the accommodating portion is used to accommodate the ball A20; the ball A20 is built into the accommodating portion, and the outer diameter of the ball A20 is slightly larger than the mouth size of the first cage opening A11.

[0093] In this embodiment, the outer cage A10 and the exhaust pipe 11 can be made of metal, plastic or other materials.

[0094] The exhaust pipe 11 can be a straight pipe or a curved pipe. Furthermore, the curved pipe can be Figures 8 to 12 The 45° elbow shown in the figure is only an example and does not limit the scope of protection of this application. In specific applications, you can choose to use a straight pipe or a bent pipe according to the actual situation. The straight pipe is simple to manufacture and is suitable for vertical installation or small angle inclination, while the bent pipe has a wider range of applications and can be installed at a large angle or even horizontally. Fig. 9 and Fig.12 The figure shows the vertical installation of the elbow. Fig.10 The figure shows the horizontal installation of the elbow. Fig.13 The above diagram is only for explanation and does not limit the protection scope of the present application.

[0095] In this embodiment, one end of the outer cage A10 has a first conical structure A12, and the first conical structure A12 is provided with a first cage opening A11; the other end of the outer cage A10 has a second conical structure A14, and the second conical structure A14 is provided with a second cage opening A13, wherein the mouth size of the second cage opening A13 is slightly smaller than the outer diameter of the sphere A20; the first conical structure A12 and the second conical structure A14 are connected to form the outer cage A10, or the first conical structure A12 and the second conical structure A14 are connected to form the outer cage A10 with a connector A15, wherein the connector A15 can be a cylindrical structure.

[0096] like Fig. 9 As shown, the cone angle of the first conical structure A12 is 90-2α°, and the rolling inclination angle α is preferably 10-20°, wherein the rolling inclination angle α is the radial angle between the gravity direction and the cage edge of the first conical structure A12. The above arrangement ensures that the ball A20 can smoothly roll to the first cage opening A11 by its own weight, and can also easily roll out of the first cage opening A11 under relatively small wind pressure. Since the rolling inclination angle α is relatively small, the power required for the ball movement is small, and the one-way check valve of this structure can be opened or closed under a small pressure difference; and the ball material is soft, and the sealing effect is better than that of a plate-type one-way valve.

[0097] The ball A20 is a hollow rubber ball or a light high-density sponge ball. In this embodiment, a hollow rubber ball is used to reduce the weight; or a light high-density sponge ball is used; the ball A20 is soft, wear-resistant, smooth and easy to deform, can adapt to the shape of the first cage opening A11 and fit the exhaust pipe 11 opening, and tightly seal the exhaust pipe 11 opening.

[0098] In this embodiment, in order to facilitate the replacement of the ball A20, a second cage opening A13 is reserved in this embodiment, and the cage opening size is slightly smaller than the ball A20, so that the ball A20 can be easily loaded or removed without escaping the cage. Preferably, the mouth size of the second cage opening A13 is slightly smaller than the outer diameter of the ball A20 by 2-5 mm.

[0099] It should be noted that, due to the limitation of the material of the ball A20, the ball A20 described above is suitable for use at room temperature or low temperature; if the temperature is higher, corresponding high temperature materials such as Teflon, glass or even steel balls can be used. When the ball A20 uses the above-mentioned hard ball, in order to facilitate the replacement of the ball A20, the outer cage A10 is further configured as an openable combined cage.

[0100] The outer cage A10 is a ball cage structure, which has a plurality of holes A101. The holes A101 form a flow channel with the first cage opening A11 on the one hand, and can be used to conveniently observe the working state inside the outer cage A10 on the other hand. The ball cage structure can be formed by steel wire weaving, welding or plate punching. The holes A101 can be circular holes, waist holes, square holes, trapezoidal holes, triangular holes or elliptical holes, etc. The specific shapes of the above holes 101 are only for illustration and do not limit the protection scope of this application.

[0101] The inner surface of the outer cage A10 is a smooth surface, the ball A20 is easy to roll, and the ball A20 does not damage the surface of the ball A20 when moving inside.

[0102] For ease of manufacturing and processing, the outer cage A10 is preferably an integrally formed structure.

[0103] When the pressure inside the barrel 02 is greater than the external pressure, the sphere A20 jumps up with the airflow to release the pressure, and the circulation channel is opened; when the pressure inside the barrel 02 is less than the external pressure, the sphere A20 is adsorbed at the first cage mouth A11 to close the circulation channel; when the pressure inside the inner cavity of the barrel 02 is equal to the external pressure, the sphere A20 can fall to the first cage mouth A11 by its own weight without blocking the circulation channel.

[0104] like Figures 1 to 4 As shown, the feeding mechanism includes: a negative pressure conveying mechanism, a negative pressure conveying channel connected to the negative pressure conveying mechanism, and a feeding hopper 1002, wherein the negative pressure conveying channel is also connected to the air outlet 09 of the barrel 02, and the feeding hopper is connected to the feeding port 10 of the barrel 02 through a feeding pipe 1001.

[0105] The feeding mechanism further includes a negative pressure filter box 0902, which is connected to the negative pressure conveying channel. In this embodiment, the negative pressure filter box 0902 is provided to increase the area to reduce the negative pressure air flow velocity, and can precipitate fine particles and other materials to prevent the fine particles and other materials from being sucked into the exhaust fan and damaging the exhaust fan blades.

[0106] A wire mesh 0903 is provided in the negative pressure filter box 0902. The wire mesh 0903 is used to precipitate materials such as fine particles, wherein the wire mesh 0903 is preferably made of materials such as stainless steel.

[0107] The wire mesh 0903 may be arranged in the negative pressure filter box 0902 in a horizontal, vertical or inclined manner.

[0108] like Figure 3 As shown, the wire mesh 0903 divides the negative pressure filter box 0902 into a first cavity and a second cavity, wherein a first interface arranged on the first cavity is connected to the first negative pressure delivery sub-channel 0901 in the negative pressure delivery channel; and a second interface arranged on the second cavity is connected to the second negative pressure delivery sub-channel 0703 in the negative pressure delivery channel.

[0109] This embodiment illustrates the situation where the wire mesh 0903 is installed in a horizontal manner, and the first cavity is set below the second cavity, that is, the setting height of the first interface is lower than the setting height of the second interface. Then, the negative pressure airflow in the negative pressure delivery channel passes through the first negative pressure delivery sub-channel 0901 and first passes through the first interface to enter the first cavity set below. Due to the interception and filtration effect of the wire mesh 0903, the fine particles will gradually settle in the first cavity; then the negative pressure airflow passes through the wire mesh 0903 to enter the second cavity, and then enters the second negative pressure delivery sub-channel 0703 from the second interface. The above-mentioned setting method of the wire mesh 0903 is only for example, and it does not limit the scope of protection of this application.

[0110] The second negative pressure delivery sub-channel 0703 is also provided with a second three-way valve 0704, and the connectivity of the second negative pressure delivery sub-channel 0703 can be switched and controlled by operating the second three-way valve 0704.

[0111] The negative pressure filter box 0902 is made of transparent materials or other existing materials, such as organic glass, etc. This transparent setting makes it easier to observe the working conditions in the negative pressure filter box 0902. When the filtered fine particles accumulate more, operations such as cleaning or replacement can be carried out in time.

[0112] This embodiment is also equipped with a temperature sensor 15, which is arranged at the upper part of the barrel 02, and is used to monitor the working temperature of the granular material.

[0113] This embodiment is also equipped with a first material level sensor 16 and a second material level sensor 17, which are respectively arranged at the upper part of the barrel 02 and the lower part of the barrel 02. The first material level sensor 16 is arranged near the upper half of the barrel 02, and the second material level sensor 17 is arranged near the discharge port of the barrel 02. The first material level sensor 16 is used to detect whether the material is added to the set position, and the second material level sensor 17 is used to detect the material level state of the material near the discharge port.

[0114] This embodiment is also equipped with a driving power supply 14 , and the driving power supply 14 is electrically connected to the microwave magnetron 1301 .

[0115] This embodiment is also equipped with a control box 18, which is installed on the mounting frame 01. The control box 18 is electrically connected to the microwave magnetron 1301, the three-way electric ball valve 05, the first three-way valve 0501, the second three-way valve 0704, the positive pressure delivery mechanism and the negative pressure delivery mechanism. The control box 18 is equipped with a microcomputer and an electrical control switch, which are used to control the coordinated work of the microwave magnetron 1301, the three-way electric ball valve 05, the first three-way valve 0501, the second three-way valve 0704, the positive pressure delivery mechanism and the negative pressure delivery mechanism according to the set program.

[0116] Here's how this application works:

[0117] The feeding process of the granular material: the control electrical box 18 automatically starts the blower 07 to draw negative pressure and form a negative pressure environment in the barrel 02. During the process of drawing negative pressure, the granular material in the feed hopper 1002 is continuously pumped into the barrel 02. When the first material level sensor 16 detects that the material is full or the material is added to the set position, the feeding is stopped. In particular, during the process of drawing negative pressure, the negative pressure filter box 0902 arranged in the negative pressure conveying channel can increase the area to reduce the negative pressure airflow velocity, and can precipitate fine granular materials and the like to prevent fine granular materials and the like from being sucked into the exhaust fan and damaging its blades.

[0118] Working process of turning over and heating: the control electric box 18 automatically starts the blower 07 to blow air, and the wind passes through the air source conveying channel 06 and then through the B port of the three-way electric ball valve 05 to the lower end of the blowing tube 03 to blow upward, blowing the granular material that enters the blowing tube 03 through the feed hole 0301 at the bottom upward, and the granular material hits the bulk material tray 0303 at the top and spreads around with the wind, and falls to the top layer of the granular material. When the blower 07 is started to blow and turn over the material, the microwave drying mechanism 13 also starts to work, and microwaves are heated from the top. During the working process, the granular material moves down and turns up layer by layer. Microwaves emit microwaves to the granular material, and dynamically and evenly heat the granular material. In the process of the bottom granular material turning up with the wind, the wind cools the granular material again, and the drying of the granular material is completed after multiple cycles. During the drying process, the granular material is heated and cooled evenly, and there will be no local overheating or lack of heating.

[0119] Microwave irradiation drying and wind-driven turning of the pellets can be performed simultaneously, or the air supply / transportation gas source and the working time of the microwave drying mechanism 13 can be controlled separately according to the set program. The program can appropriately adjust the working time ratio according to the initial temperature conditions and the drying intensity requirements. When the temperature sensor 15 detects that the heating temperature is low, the working mode of the blower 07 can be adjusted to intermittent operation, while the microwave drying mechanism 13 is always working. When the set temperature is reached, the microcomputer in the control box 18 automatically controls to reduce the working intensity of the microwave drying mechanism 13 to prevent the pellets from being overheated. When the heating and drying time reaches the time preset by the program, the control program automatically stops heating and blowing to complete the drying of a tube of pellets.

[0120] Discharging process: After drying is completed, prepare for discharging. The control box 18 controls the three-way electric ball valve 05 to rotate, so that the first port A and the second port B in the three-way electric ball valve 05 are disconnected, and the first port A and the third port C are connected. Then the blower 07 is turned off, and the granular material flows downward along the blowing pipe 03 through the feed hole 0301 under the action of gravity, enters the discharge channel 08 through the three-way electric ball valve 05 and finally reaches the storage box 0801, completing the discharging. When the second material level sensor 17 at the bottom detects that there is no material, it stops working and the working cycle ends. Wait for instructions to enter the next drying cycle, and work reciprocatingly.

[0121] It should be understood that, although the terms first, second, third, etc. may be used to describe certain components in the embodiments of the present application, these components should not be limited to these terms. These terms are only used to distinguish the components from each other. For example, without departing from the scope of the embodiments of the present application, the first so-and-so component may also be referred to as the second so-and-so component, and similarly, the second so-and-so component may also be referred to as the first so-and-so component.

[0122] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0123] The above embodiments are only used to illustrate the technical solution of the present application but not to limit it. The present application is described in detail with reference to the preferred embodiments. It should be understood by those skilled in the art that the technical solution of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application, and should be included in the scope of the claims of the present application.

Claims

1. A microwave drying device, characterized in that: include: A barrel having a receiving space for receiving granular material; A feeding mechanism, the feeding mechanism for conveying granular material is connected to the barrel, the feeding mechanism includes a negative pressure conveying mechanism, a negative pressure conveying channel connected to the negative pressure conveying mechanism, and a feeding hopper, wherein the negative pressure conveying channel is also connected to the air outlet of the barrel, the feeding hopper is connected to the feeding port of the barrel through a feeding pipe, the negative pressure conveying mechanism and the positive pressure conveying mechanism share the same blower and a motor used in conjunction with the blower, wherein the negative pressure conveying mechanism is connected to the positive pressure output port of the blower through the negative pressure conveying channel, and the positive pressure conveying mechanism is connected to the negative pressure output port of the blower through the air source conveying channel; A turning mechanism, which is connected to the barrel and performs feeding and turning processing on the granular material in the barrel, the turning mechanism comprises a blowing pipe, a positive pressure conveying mechanism and an air source conveying channel which are transparently arranged at the top and bottom; the blowing pipe is arranged in the barrel and connected to the bottom of the barrel, and a plurality of feeding holes are also arranged at the bottom of the blowing pipe; the positive pressure conveying mechanism is connected to the bottom of the blowing pipe through the air source conveying channel; a cover is also arranged on the blowing pipe, the cover is arranged near the bottom of the blowing pipe and above the feeding hole, the cover is detachably connected to the blowing pipe and can slide up and down along the blowing pipe, and the bottom of the blowing pipe is also connected with a discharge channel; And a microwave drying mechanism is arranged on the barrel and dries the granular material in the barrel.

2. The microwave drying equipment according to claim 1, characterized in that: The blowing pipe is also provided with a protruding structure, wherein the protruding structure is arranged between the feeding hole and the cover.

3. The microwave drying equipment according to claim 2, characterized in that: The cover is a hat-shaped cover.

4. The microwave drying equipment according to claim 1, characterized in that: A bulk material tray is also installed on the top of the blowing pipe, wherein a granular material dispersing channel is reserved between the top of the blowing pipe and the bulk material tray.

5. The microwave drying equipment according to claim 4, characterized in that: The bulk material tray is detachably mounted on the top of the blowing pipe through a bracket.

6. The microwave drying equipment according to claim 4, characterized in that: The bulk material tray is made of glass or ceramic material.

7. The microwave drying equipment according to claim 4, characterized in that: The surface of the bulk material tray is provided with a metal nano coating.

8. The microwave drying equipment according to claim 1, characterized in that: The bottom of the blowing pipe is connected to the first port of the three-way electric ball valve, the second port of the three-way electric ball valve is connected to the gas source delivery channel, and the third port of the three-way electric ball valve is connected to the discharge channel.

9. The microwave drying equipment according to claim 8, characterized in that: The bottom of the blowing pipe is connected to the first port of the three-way electric ball valve through a connecting pipeline.

10. The microwave drying equipment according to claim 9, characterized in that: The connecting pipeline has a horizontal section.

11. The microwave drying equipment according to claim 1, characterized in that: The feeding mechanism further comprises a negative pressure filter box, and the negative pressure filter box is connected and arranged on the negative pressure conveying channel.

12. The microwave drying equipment according to claim 11, characterized in that: The negative pressure filter box is provided with a wire mesh arranged in a horizontal, vertical or inclined manner.

13. The microwave drying equipment according to claim 12, characterized in that: The wire mesh divides the negative pressure filter box into a first cavity and a second cavity, wherein a first interface arranged on the first cavity is connected to a first negative pressure delivery sub-channel in the negative pressure delivery channel; and a second interface arranged on the second cavity is connected to a second negative pressure delivery sub-channel in the negative pressure delivery channel.

14. The microwave drying equipment according to claim 11, characterized in that: The negative pressure filter box is made of transparent material.

15. The microwave drying equipment according to claim 1, characterized in that: The barrel is also provided with an exhaust pipe, wherein the pipe opening of the exhaust pipe is also provided with a one-way check valve.

16. The microwave drying equipment according to claim 15, characterized in that: The one-way check valve comprises an outer cage and a sphere, wherein the outer cage comprises a accommodating portion and a first cage opening, the accommodating portion has a flow passage through the first cage opening and a hole arranged on the outer cage, and the accommodating portion is used to accommodate the sphere; the sphere is placed in the accommodating portion, and the outer diameter of the sphere is slightly larger than the size of the mouth of the first cage opening.

17. The microwave drying equipment according to claim 16, characterized in that: One end of the outer cage has a first conical structure, and a first cage opening is arranged on the first conical structure; the other end of the outer cage has a second conical structure, and a second cage opening is also arranged on the second conical structure, wherein the mouth size of the second cage opening is slightly smaller than the outer diameter of the sphere; the first conical structure and the second conical structure are connected to form the outer cage, or the first conical structure and the second conical structure are connected to form the outer cage.

18. The microwave drying equipment according to claim 17, characterized in that: The cone surface angle of the first cone structure is 90-2α°, and the rolling inclination angle α is 10-20°, wherein the rolling inclination angle α is the radial angle between the gravity direction and the cage edge of the first cone structure.

19. The microwave drying equipment according to claim 16, characterized in that: The sphere is one of a hollow rubber ball, a light high-density sponge ball, a Teflon ball, a glass ball or a steel ball.

20. The microwave drying equipment according to claim 16, characterized in that: The inner corner where the exhaust pipe is connected to the first cage opening is a smooth annular chamfer, wherein the annular chamfer forms an inner conical surface that is convenient for closely fitting with the surface of the sphere.

21. The microwave drying equipment according to claim 16, characterized in that: The exhaust pipe and the air outlet are both provided with a tube that is extended inwardly, wherein the aspect ratio of the tube is greater than or equal to 2.

22. The microwave drying equipment according to claim 1, characterized in that: The microwave drying mechanism comprises a microwave magnetron, and the microwave magnetron is installed on the barrel through a waveguide port.

23. The microwave drying equipment according to claim 22, characterized in that: The bottom of the waveguide opening is covered with a Teflon plate, and the waveguide opening is fixed to the cover at the top of the barrel through the Teflon plate.

24. The microwave drying equipment according to claim 1, characterized in that: A temperature sensor is also included, and the temperature sensor is arranged on the upper part of the barrel.

25. The microwave drying equipment according to claim 1, characterized in that: It also includes a first material level sensor and a second material level sensor, wherein the first material level sensor and the second material level sensor are respectively arranged at the upper part and the lower part of the barrel.

26. The microwave drying equipment according to claim 1, characterized in that: It also includes a control electric box, which is electrically connected to the microwave magnetron, the three-way electric ball valve, the first three-way valve, the second three-way valve, the positive pressure delivery mechanism and the negative pressure delivery mechanism.

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