Sodium hydrosulfite microwave drying device and drying method

Abstract

The invention relates to the technical field of sodium hydrosulfite drying, and discloses a sodium hydrosulfite microwave drying device and method.The sodium hydrosulfite microwave drying device comprises a drying cylinder, three baffles are linearly installed in the drying cylinder, and the drying cylinder is divided into three drying cavities and a cooling cavity by the baffles from left to right; a vacuum meter is fixedly connected to the upper wall of the drying cylinder in an inserted mode, vacuumizing pipes externally connected with a vacuum source are fixedly connected to the upper walls of the three drying cavities in an inserted mode, and infrared radiation thermometers and thermocouple thermometers are fixedly connected to the upper walls of the three drying cavities and the upper wall of the cooling cavity. Through microwave vacuum drying, sodium hydrosulfite in each tray driven by the material conveying assembly to operate is heated internally and externally at the same time, the heating speed is high, heating is uniform, drying energy consumption is low, the condition of external coke and internal generation in conventional heating is avoided, the heating temperatures in different drying cavities can be automatically controlled, and the drying efficiency is improved. The drying treatment temperature distribution required by sodium hydrosulfite is ensured, over-temperature of sodium hydrosulfite is prevented, the drying effect is good, and safety and reliability are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of sodium hydrosulfite drying, and in particular to a sodium hydrosulfite microwave drying device and a drying method. Background Art

[0002] Sodium hydrosulfite, chemically known as sodium dithionite, is a white crystalline powdered inorganic compound. It is active in nature, easily oxidized in the air, and has strong reducing properties. It is mainly used as a printing and dyeing auxiliary, papermaking bleaching agent, pharmaceutical intermediate, clay bleaching agent, food additive, etc. At present, after the production of sodium hydrosulfite, it needs to be dried to remove moisture after filtration and washing. In addition, since methanol is used as a solvent for processing during the production of sodium hydrosulfite, a small amount of methanol will be contained in the final sodium hydrosulfite, and the methanol will also turn into gaseous precipitation during drying.

[0003] Authorized patent CN213300775U discloses a printing and dyeing industry insurance powder drying device that can improve the yield rate, including a drum, a jacket and a bracket, a filter cartridge welded in the middle of the drum, an inlet pipe welded at the bottom of the jacket, an outlet pipe welded at the top of the jacket, a hopper arranged at one end of the drum, a discharge pipe arranged at the other end of the drum, and a discharge pipe welded at the top of the outlet pipe. The patent heats the airflow blown in by the fan through an electric heating wire to form hot air, uses the hot air to dry the insurance powder, and can control the temperature of the drying hot air to keep it within a reasonable range to ensure the safety of the insurance powder, limit the insurance powder to the inner side of the filter cartridge to prevent the insurance powder from being blown into the air, automatically clean the filter cartridge to avoid clogging of the filter cartridge, avoid incomplete drying of the insurance powder due to accumulation, ensure that the insurance powder is evenly dried, and improve the dryness of the insurance powder, which is suitable for drying insurance powder.

[0004] When the insurance powder drying device in the above patent is in use, the filter cartridge is driven by a drum to continuously turn the insurance powder and dry it with the aid of hot air. Since an external heat source is used to conduct heat to the insurance powder through air, the thermal efficiency is low, the overall drying rate is slow, and the energy consumption is large. When the amount of insurance powder dried is large, the main body of the insurance powder exists at the bottom of the filter cartridge. The hot air blown upward by the wind pipe at the bottom of the filter cartridge is difficult to uniformly contact and conduct heat with the insurance powder in various areas. There is a temperature difference in the insurance powder distributed in different areas, and the drying and heating temperature control effect of the insurance powder is poor. When the insurance powder is dried, it is easy to be blown away and oxidized by hot air, and an explosive mixture is formed in the air. At the same time, the volatilized methanol gas will also mix with the air, which is prone to explosion risks and has low drying safety. Summary of the invention

[0005] The purpose of the present invention is to solve the problems of slow drying rate, high energy consumption, poor temperature control effect of different outputs and low safety in general drying of sodium hydrosulfite. The present invention provides a sodium hydrosulfite microwave drying device and a drying method.

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A microwave drying device for sodium hypochlorite comprises a drying cylinder, three baffles are linearly installed inside the drying cylinder, the baffles respectively divide the drying cylinder into three drying chambers and a cooling chamber from left to right, a vacuum gauge is fixedly plugged into the upper wall of the drying cylinder, a vacuum pumping tube connected to an external vacuum source is fixedly plugged into the upper walls of the three drying chambers, an infrared radiation thermometer and a thermocouple thermometer are fixedly connected to the upper walls of the three drying chambers and the upper walls of the cooling chamber, monitors are fixedly connected to the upper walls on both sides of the inner cavity of the drying cylinder, a condenser is fixedly connected to the middle of the cooling chamber, a plurality of rows of microwave generators are circumferentially installed on the upper wall of the drying cylinder, and a magnetron extending into the drying chamber is arranged at the bottom of the microwave generator; A feeding assembly is provided in the middle of the inner cavity of the drying cylinder, and the feeding assembly includes a plurality of trays that can be operated in a ring shape. A spreading device is fixedly connected to the left side of the inner cavity of the drying cylinder, a screw metering pump tube is fixedly connected to the top of the spreading device, and a hopper arranged on the upper side of the drying cylinder is fixedly connected to the top of the screw metering pump tube; A material receiving trough is provided on the lower right wall of the drying cylinder, and a material receiving assembly is fixedly connected to the bottom of the material receiving trough. A microwave source program controller and a screen display controller are respectively fixedly connected to the front side of the drying cylinder. The microwave source program controller electrically controls each microwave generator, and the screen display controller is electrically connected to the microwave source program controller, the infrared radiation thermometer, the thermocouple thermometer, the monitor and the condenser.

[0007] Furthermore, the lengths of the three drying chambers decrease sequentially from left to right, and the numbers of the microwave generators corresponding to the tops of the three drying chambers decrease sequentially from left to right.

[0008] Furthermore, the feeding assembly also includes gear rollers rotatably connected to the left and right sides of the inner cavity of the drying cylinder, the rear wall of the drying cylinder is fixedly connected to a reduction motor connected to the output of the gear rollers on the right side, two groups of transmission chains are movably connected between the gear rollers, and a plurality of trays are equidistantly movably connected between the two groups of transmission chains, the transmission chain movably passes through each of the baffles, and the baffles are provided with through grooves adapted to the transmission chains.

[0009] Furthermore, an upper supporting bar and a lower supporting bar are respectively provided on the front and rear walls of the inner cavity of the drying cylinder, the upper supporting bar is movably abutted against the bottom of the upper tray, and the lower supporting bar is movably abutted against the bottom of the lower tray.

[0010] Furthermore, the condenser is located in the cooling cavity and is respectively located in the inner cavities of the two groups of transmission chains, and the heat dissipation end of the condenser is located at the rear side of the drying cylinder.

[0011] Furthermore, the spreader is located on the upper side of the pallet, and the width of the outlet at the lower end of the spreader is smaller than the filling width of the pallet.

[0012] Furthermore, the material receiving assembly includes an upper gate valve fixedly connected to the bottom of the material receiving trough, the lower end of the upper gate valve is fixedly connected to the finished product bin, the lower end of the finished product bin is fixedly connected to the lower gate valve, the left wall of the finished product bin is fixedly connected to a three-way pipe, a filter is provided at the connecting end of the three-way pipe and the finished product bin, a three-way valve is installed in the middle of the three-way pipe, the rear end of the three-way pipe is connected to an external vacuum source, and the front end of the three-way pipe is connected to the outside world.

[0013] Furthermore, the screen display controller is composed of a PLC programmable controller and a touch-type graphic display operation terminal.

[0014] Furthermore, legs are fixedly connected to the left and right sides of the bottom of the drying cylinder, and the height of the bottom ends of the legs is lower than the height of the lower end outlet of the lower gate valve.

[0015] A method for drying sodium hydrosulfite by microwave, comprising the following steps: S1, control the vacuum source to evacuate the drying cylinder through each of the vacuum pipes, and control the operation of the feeding assembly to add the raw materials into the hopper, the screw metering pump tube automatically inputs the raw materials to the spreader in a quantitative manner, and the spreader automatically spreads the raw materials into the operating tray; S2, the tray drives the raw material to move from left to right in the inner cavity of the drying cylinder, and passes through three drying chambers and one cooling chamber. The microwave generators on the three drying chambers respectively emit microwaves through the magnetron to heat the raw material step by step. During this period, the infrared radiation thermometer in each drying chamber and the cooling chamber monitors the temperature of the raw material, and the thermocouple thermometer monitors the temperature of the corresponding cavity; S3, the screen display controller automatically controls the microwave source program controller to adjust the required power of the microwave generators on different drying chambers according to the temperature signals of the corresponding areas collected by the infrared radiation thermometer and the thermocouple thermometer, so as to control the heating temperature distribution, and automatically adjust the cooling temperature required by the condenser; S4. The completely dried raw materials entering the cooling chamber are automatically cooled by the condenser after absorbing heat, and are then dumped into the receiving trough by the tray and automatically output by the receiving assembly.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention heats the internal and external sides of the sodium hydrosulfite in each tray driven by the feeding assembly simultaneously through microwave vacuum drying, with fast heating speed, uniform heating, low drying energy consumption, and no external coke and internal growth that occurs in conventional heating, thereby achieving good drying effect.

[0017] 2. The present invention adopts an infrared radiation thermometer to monitor the temperature of the raw materials, and adopts a thermocouple thermometer to monitor the temperature of the corresponding cavity. The screen controller automatically controls the microwave source program controller to adjust the power of the microwave generators on different drying cavities according to the temperature signals collected by the infrared radiation thermometer and the thermocouple thermometer in each drying cavity, so as to control the heating temperature in different drying cavities, thereby ensuring the drying treatment temperature distribution required by the insurance powder, preventing it from overheating, and achieving good drying effect. The screen controller can be used to set the parameter value of the drying temperature required for the insurance powder, thereby automatically adjusting the power of the microwave generators on different drying cavities, and meeting the highest output production according to demand.

[0018] 3. The present invention uses microwave vacuum drying, so the insurance powder does not need to be blown away, and avoids contact with air during drying. At the same time, it avoids the volatilization of methanol gas and mixing with air, and the drying is safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural diagram of the drying device of the present invention; Figure 2 The present invention is a three-dimensional section of the drying cylinder of the drying device Figure 1 ; Figure 3 It is a three-dimensional structural diagram of the transmission chain part of the drying device of the present invention; Figure 4 The present invention is a three-dimensional section of the drying cylinder of the drying device Figure 2 ; Figure 5 It is a three-dimensional cutaway view of the material receiving trough portion of the drying device of the present invention; Figure 6 It is a three-dimensional cutaway view of the three-way pipe portion of the drying device of the present invention.

[0020] Figure numerals: 1. Drying cylinder; 11. Baffle; 12. Vacuum gauge; 13. Vacuum tube; 14. Infrared radiation thermometer; 15. Thermocouple thermometer; 16. Monitor; 17. Condenser; 18. Upper support bar; 19. Lower support bar; 2. Microwave generator; 21. Magnetron; 3. Gear roller; 31. Transmission chain; 32. Tray; 4. Material spreader; 41. Screw metering pump tube; 42. Hopper; 5. Material receiving trough; 51. Upper gate valve; 52. Finished product bin; 53. Lower gate valve; 54. Three-way pipe; 55. Three-way valve; 6. Microwave source program controller; 7. Screen controller; 8. Support leg. DETAILED DESCRIPTION

[0021] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Embodiment 1

[0022] like Figure 1-Figure 6 As shown, a microwave drying device for sodium hypochlorite comprises a drying cylinder 1, three baffles 11 are linearly installed inside the drying cylinder 1, and the baffles 11 respectively divide the drying cylinder 1 into three drying chambers and a cooling chamber from left to right, a vacuum gauge 12 is fixedly plugged into the upper wall of the drying cylinder 1, and a vacuum pumping tube 13 connected to an external vacuum source is fixedly plugged into the upper walls of the three drying chambers, an infrared radiation thermometer 14 and a thermocouple thermometer 15 are fixedly connected to the upper walls of the three drying chambers and the cooling chamber, monitors 16 are fixedly connected to the upper walls on both sides of the inner cavity of the drying cylinder 1, a condenser 17 is fixedly connected to the middle of the cooling chamber, a plurality of rows of microwave generators 2 are installed on the circumference of the upper wall of the drying cylinder 1, and a magnetron 21 extending into the drying chamber is arranged at the bottom of the microwave generator 2; A feeding assembly is provided in the middle of the inner cavity of the drying cylinder 1, and the feeding assembly includes a plurality of trays 32 that can be operated in a ring shape. A spreading device 4 is fixedly connected to the left side of the inner cavity of the drying cylinder 1, a screw metering pump tube 41 is fixedly connected to the top of the spreading device 4, and a hopper 42 arranged on the upper side of the drying cylinder 1 is fixedly connected to the top of the screw metering pump tube 41; A material receiving trough 5 is provided on the lower right wall of the drying cylinder 1, and a material receiving assembly is fixedly connected to the bottom of the material receiving trough 5. A microwave source program controller 6 and a screen display controller 7 are fixedly connected to the front side of the drying cylinder 1. The microwave source program controller 6 electrically controls each microwave generator 2. The screen display controller 7 is electrically connected to the microwave source program controller 6, the infrared radiation thermometer 14, the thermocouple thermometer 15, the monitor 16 and the condenser 17.

[0023] Furthermore, the screen display controller 7 is composed of a PLC programmable controller and a touch-type graphic display operation terminal, and has stable control performance. When in use, it can automatically adjust the microwave source program controller 6 to change the microwave generating power of the microwave generator 2 according to the set temperature parameter value, and can control production with the highest output. Moreover, since the touch-type graphic display operation terminal is a human-machine interface, the microwave generating power of the microwave generator 2 can be forcibly controlled through the terminal, and the screen display controller 7 can collect information on the working conditions of the magnetron 21 and related circuits, and can automatically alarm in case of damage, so as to facilitate timely troubleshooting.

[0024] When the sodium hypochlorite is dried, the inside of the drying cylinder 1 is evacuated by controlling the external vacuum source through the vacuum tube 13. The vacuum degree inside the drying cylinder 1 can be observed by the vacuum meter 12. The feeding assembly is controlled to drive the tray 32 to rotate in a circular manner. The sodium hypochlorite raw materials with corresponding moisture content after pressure filtration and washing are continuously added to the hopper 42. The screw metering pump tube 41 automatically conveys a certain amount of raw materials to the spreader 4. After receiving the raw materials, the spreader 4 automatically spreads the raw materials on the running tray 32. The tray 32 drives the raw materials to rotate horizontally from left to right in the inner cavity of the drying cylinder 1, and passes through the drying cylinder 1. The microwave generators 2 on the three drying chambers emit microwaves downward through the magnetrons 21 respectively. The microwave energy directly acts on the raw material molecules, causing them to vibrate, rotate, collide and generate heat. The raw materials are fully and evenly irradiated with microwaves, and the materials are dried evenly. During this period, each infrared radiation thermometer 14 monitors the temperature of the raw materials, and each thermocouple thermometer 15 monitors the temperature of the corresponding cavity. The screen display controller 7 automatically controls the microwave source program controller 6 to adjust the temperature of different drying chambers according to the temperature signals collected by the infrared radiation thermometer 14 and the thermocouple thermometer 15 in each drying chamber. The microwave generator 2 on the drying chamber is adjusted to the power required to adjust the heating temperature in different drying chambers, and the different drying chambers are separated by baffles 11 to avoid accidental mutual influence of microwaves of different powers. During the drying period, the water vapor and methanol vapor volatilized by heat in the sodium hydroxide raw material are automatically extracted and processed by the external vacuum source through three vacuum tubes 13. The raw materials passing through the three drying chambers are completely dried and enter the cooling chamber, and are automatically cooled by the condenser 17 by absorbing heat. When the feeding component drives the tray 32 to the rightmost side of the cooling chamber, the dried and cooled sodium hydroxide in the tray 32 is poured into the receiving trough 5 and automatically output by the receiving component. During this period, the left and right monitors 16 automatically monitor the input and output of the sodium hydroxide raw material by the feeding component, and the monitoring information is automatically collected by the screen controller 7. The infrared radiation thermometer 14 in the cooling chamber automatically monitors the temperature of the sodium hydroxide to be output, and the thermocouple thermometer 15 monitors the temperature in the cooling chamber. Similarly, the screen controller 7 can automatically control the cooling power of the condenser 17 in the cooling chamber according to the collected temperature signal to ensure the required sodium hydroxide output collection temperature. Embodiment 2

[0025] like Figure 2 As shown, the lengths of the three drying chambers decrease from left to right, and the numbers of the microwave generators 2 corresponding to the tops of the three drying chambers decrease from left to right.

[0026] When the tray 32 drives the sodium hypochlorite raw material to move horizontally from left to right in the inner cavity of the drying cylinder 1 and passes through three drying chambers respectively, the first drying chamber plays a role in heating and drying the main body of the raw material, while the subsequent two drying chambers can adaptively reduce or increase the drying power according to the raw material and chamber temperature in the previous drying chamber and continue to assist in drying the raw material with the residual temperature. The drying is gentle and easy to control, avoiding the burning of the raw material. Embodiment 3

[0027] Provide a feeding component structure: like Figure 2-Figure 4 As shown, the feeding assembly also includes gear rollers 3 rotatably connected to the left and right sides of the inner cavity of the drying cylinder 1, a reduction motor connected to the output of the right gear roller 3 is fixedly connected to the rear wall of the drying cylinder 1, two groups of transmission chains 31 are movably connected between the gear rollers 3, and a plurality of trays 32 are equidistantly movably connected between the two groups of transmission chains 31, and the transmission chain 31 movably passes through each baffle 11, and a through groove adapted to the transmission chain 31 is opened on the baffle 11.

[0028] Furthermore, an upper supporting bar 18 and a lower supporting bar 19 are respectively provided on the front and rear walls of the inner cavity of the drying cylinder 1. The upper supporting bar 18 movably abuts against the bottom of the upper tray 32, and the lower supporting bar 19 movably abuts against the bottom of the lower tray 32.

[0029] When the feeding assembly is running, the reduction motor drives the gear roller 3 on the right side to make the transmission chain 31 run at a low speed, and each tray 32 rotates around the horizontal central axis. The tray 32 on the upper side of the transmission chain 31 drives the insurance powder raw material to always move horizontally, and the raw material transportation is safe and stable without falling off. The transmission chain 31 drives the tray 32 so that the insurance powder raw material can be fully and evenly irradiated with microwaves, so that the raw material is dried evenly. During the operation of the transmission chain 31, the upper supporting bar 18 and the lower supporting bar 19 respectively support the trays 32 on the upper and lower sides, thereby ensuring the safe operation of the tray 32 and extending the service life of the transmission chain 31. Embodiment 4

[0030] like Figure 2 As shown, the condenser 17 is located in the cooling cavity and is respectively located in the inner cavities of the two sets of transmission chains 31 , and the heat dissipation end of the condenser 17 is located at the rear side of the drying cylinder 1 .

[0031] When the condenser 17 is in operation, it can absorb heat and cool the hydrosulfite raw material conveyed by the tray 32 after drying at the closest position, and the absorbed heat can be discharged from the outside of the drying cylinder 1. Embodiment 5

[0032] like Figure 3 As shown, the spreader 4 is located on the upper side of the pallet 32 ​​, and the width of the outlet at the lower end of the spreader 4 is smaller than the filling width of the pallet 32 ​​.

[0033] The design that the outlet width at the lower end of the spreader 4 is smaller than the loading width of the tray 32 can prevent the sodium-sulfur powder raw material from leaking when the spreader 4 outputs the sodium-sulfur powder raw material to the tray 32 . Embodiment 6

[0034] Provide a material connection component structure: like Figure 5-Figure 6 As shown, the material receiving assembly includes an upper gate valve 51 fixedly connected to the bottom of the material receiving trough 5, the lower end of the upper gate valve 51 is fixedly connected to the finished product bin 52, the lower end of the finished product bin 52 is fixedly connected to the lower gate valve 53, the left wall of the finished product bin 52 is fixedly connected to a three-way pipe 54, a filter is provided at the connecting end of the three-way pipe 54 and the finished product bin 52, a three-way valve 55 is installed in the middle of the three-way pipe 54, the rear end of the three-way pipe 54 is connected to an external vacuum source, and the front end of the three-way pipe 54 is connected to the outside.

[0035] Initially, the upper gate valve 51 and the lower gate valve 53 are both in the closed state, and the finished product bin 52 is vacuumed. When the insurance powder raw material in the tray 32 is dumped into the receiving trough 5, the upper gate valve 51 automatically opens to release the insurance powder raw material into the finished product bin 52 and then closes, the lower gate valve 53 automatically opens and the three-way valve 55 operates to control the finished product bin 52 to communicate with the outside through the front port, so as to facilitate the discharge of the internal and external air pressure balance. After the discharge, the lower gate valve 53 automatically closes, and the three-way valve 55 resets to control the finished product bin 52 to communicate with the vacuum source through the rear port, so as to evacuate the finished product bin 52 again to prevent air from entering the drying cylinder 1 during subsequent discharge and affecting the drying safety. Embodiment 7

[0036] like Figure 1 As shown, legs 8 are fixedly connected to the left and right sides of the bottom of the drying cylinder 1, and the bottom end height of the legs 8 is lower than the outlet height of the lower end of the lower gate valve 53.

[0037] The use of the legs 8 allows the drying cylinder 1 to be off the ground, making it easier for humans to view and operate the microwave source program controller 6 and the screen display controller 7, as well as to inspect and maintain the drying cylinder 1 as a whole. At the same time, the design that the bottom end of the legs 8 is lower than the height of the lower end outlet of the lower gate valve 53 ensures that there is output space for the insurance powder raw material at the lower end of the lower gate valve 53. Embodiment 8

[0038] A method for microwave drying of sodium hydrosulfite is provided, comprising the following steps: S1, control the vacuum source to evacuate the drying cylinder 1 through the vacuum pipes 13, and control the operation of the feeding assembly to add the raw materials into the hopper 42, and the screw metering pump pipe 41 automatically inputs the raw materials into the spreader 4 in a quantitative manner, and the spreader 4 automatically spreads the raw materials into the running tray 32; S2, the tray 32 drives the raw material to move from left to right in the inner cavity of the drying cylinder 1, and passes through three drying chambers and one cooling chamber. The microwave generators 2 on the three drying chambers respectively emit microwaves through the magnetron 21 to heat the raw material step by step. During this period, the infrared radiation thermometer 14 in each drying chamber and cooling chamber monitors the temperature of the raw material, and the thermocouple thermometer 15 monitors the temperature of the corresponding cavity; S3, the screen display controller 7 automatically controls the microwave source program controller 6 to adjust the required power of the microwave generators 2 on different drying chambers according to the temperature signals of the corresponding areas collected by the infrared radiation thermometer 14 and the thermocouple thermometer 15, so as to control the heating temperature distribution, and automatically adjust the required cooling temperature of the condenser 17; S4. The completely dried raw materials entering the cooling chamber are automatically cooled by the condenser 17 after absorbing heat, and are then poured into the receiving trough 5 by the tray 32 and automatically output by the receiving assembly.

[0039] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hydrosulfite microwave drying device, comprising a drying cylinder (1), characterized in that: Three baffles (11) are linearly installed inside the drying cylinder (1), and the baffles (11) respectively divide the drying cylinder (1) into three drying chambers and one cooling chamber from left to right. A vacuum gauge (12) is fixedly plugged into the upper wall of the drying cylinder (1), and a vacuum pumping tube (13) connected to an external vacuum source is fixedly plugged into the upper walls of the three drying chambers. An infrared radiation thermometer (14) and a thermocouple thermometer (15) are fixedly connected to the upper walls of the three drying chambers and the cooling chamber. Monitors (16) are fixedly connected to the upper walls on both sides of the inner cavity of the drying cylinder (1), and a condenser (17) is fixedly connected to the middle of the cooling chamber. Multiple rows of microwave generators (2) are installed on the circumference of the upper wall of the drying cylinder (1), and a magnetron (21) extending into the drying chamber is arranged at the bottom of the microwave generator (2); A material conveying assembly is arranged in the middle of the inner cavity of the drying cylinder (1), and the material conveying assembly includes a plurality of trays (32) that can be rotated in a ring shape. A material spreader (4) is fixedly connected to the left side of the inner cavity of the drying cylinder (1), a screw metering pump tube (41) is fixedly connected to the top of the material spreader (4), and a hopper (42) arranged on the upper side of the drying cylinder (1) is fixedly connected to the top of the screw metering pump tube (41); A material receiving trough (5) is provided on the lower wall of the right side of the drying cylinder (1), and a material receiving assembly is fixedly connected to the bottom of the material receiving trough (5). A microwave source program controller (6) and a screen display controller (7) are respectively fixedly connected to the front side of the drying cylinder (1). The microwave source program controller (6) electrically controls each microwave generator (2), and the screen display controller (7) is electrically connected to the microwave source program controller (6), the infrared radiation thermometer (14), the thermocouple thermometer (15), the monitor (16), and the condenser (17).

2. The hydrosulfur powder microwave drying device according to claim 1, characterized in that: The lengths of the three drying chambers decrease sequentially from left to right, and the number of microwave generators (2) corresponding to the tops of the three drying chambers decreases sequentially from left to right.

3. The hydrosulfur powder microwave drying device according to claim 2, characterized in that: The feeding assembly further comprises toothed rollers (3) rotatably connected to the left and right sides of the inner cavity of the drying cylinder (1); a reduction motor connected to the output of the toothed rollers (3) on the right side is fixedly connected to the rear wall of the drying cylinder (1); two groups of transmission chains (31) are movably connected between the toothed rollers (3); a plurality of trays (32) are movably connected between the two groups of transmission chains (31) at equal intervals; the transmission chains (31) movably pass through each of the baffles (11); and a through groove adapted to the transmission chains (31) is provided on the baffles (11).

4. The hydrosulfur powder microwave drying device according to claim 3, characterized in that: An upper supporting bar (18) and a lower supporting bar (19) are respectively provided on the front and rear walls of the inner cavity of the drying cylinder (1); the upper supporting bar (18) is movably abutted against the bottom of the upper tray (32); and the lower supporting bar (19) is movably abutted against the bottom of the lower tray (32).

5. The hydrosulfur powder microwave drying device according to claim 4, characterized in that: The condenser (17) is located in the cooling cavity and is respectively located in the inner cavities of the two sets of transmission chains (31); the heat dissipation end of the condenser (17) is located at the rear side of the drying cylinder (1).

6. The hydrosulfur powder microwave drying device according to claim 5, characterized in that: The spreader (4) is located on the upper side of the tray (32), and the width of the outlet at the lower end of the spreader (4) is smaller than the filling width of the tray (32).

7. The hydrosulfur powder microwave drying device according to claim 6, characterized in that: The material receiving assembly comprises an upper gate valve (51) fixedly connected to the bottom of the material receiving trough (5); the lower end of the upper gate valve (51) is fixedly connected to a finished product bin (52); the lower end of the finished product bin (52) is fixedly connected to a lower gate valve (53); a three-way pipe (54) is fixedly connected to the left wall of the finished product bin (52); a filter screen is provided at the connecting end of the three-way pipe (54) and the finished product bin (52); a three-way valve (55) is installed in the middle of the three-way pipe (54); the rear end of the three-way pipe (54) is externally connected to a vacuum source; and the front end of the three-way pipe (54) is connected to the outside.

8. The hydrosulfur powder microwave drying device according to claim 7, characterized in that: The screen display controller (7) is composed of a PLC programmable controller and a touch-type graphic display operation terminal.

9. The hydrosulfur powder microwave drying device according to claim 8, characterized in that: Support legs (8) are fixedly connected to both left and right sides of the bottom of the drying cylinder (1), and the height of the bottom ends of the support legs (8) is lower than the height of the lower outlet of the lower gate valve (53).

10. A method for drying sodium hydrosulfite by microwave, characterized in that: A microwave drying device for sodium hypochlorite as claimed in any one of claims 1 to 9, comprising the following steps: S1, controlling the vacuum source to evacuate the drying cylinder (1) through each of the vacuum pipes (13), and controlling the operation of the feeding assembly to add the raw material into the hopper (42), the screw metering pump tube (41) automatically inputs the raw material into the spreader (4) in a quantitative manner, and the spreader (4) automatically spreads the raw material into the operating tray (32); S2, the tray (32) drives the raw material to move from left to right in the inner cavity of the drying cylinder (1), and passes through three drying chambers and one cooling chamber. The microwave generators (2) on the three drying chambers respectively emit microwaves through the magnetrons (21) to heat the raw material in steps. During this period, the infrared radiation thermometer (14) in each drying chamber and cooling chamber monitors the temperature of the raw material, and the thermocouple thermometer (15) monitors the temperature of the corresponding cavity. S3, the screen display controller (7) automatically controls the microwave source program controller (6) to adjust the power of the microwave generators (2) on different drying chambers according to the temperature signals of the corresponding areas collected by the infrared radiation thermometer (14) and the thermocouple thermometer (15), so as to control the heating temperature distribution, and automatically adjust the cooling temperature required by the condenser (17); S4. The completely dried raw materials entering the cooling chamber are automatically cooled by the condenser (17) after absorbing heat, and are then poured into the receiving trough (5) by the tray (32) and automatically output by the receiving assembly.

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