Microwave vacuum low-temperature liquid continuous belt dryer and liquid product drying process

Abstract

The invention discloses a microwave vacuum low-temperature liquid continuous belt dryer which comprises a concentration device, a main machine device, a material distributing device, a material collecting device, a packaging device, a vacuum device and a cold water device. Wherein the liquid product is primarily evaporated through the concentration device; the host device comprises a cavity and a plurality of belt conveying modules; a plurality of groups of first microwave generators are arranged on the cavity; the distributing device is connected with the concentrating device and the plurality of belt conveying modules respectively; the material collecting device is connected with the plurality of belt conveying modules; the packaging device is connected with the material collecting device; a vacuum port of the vacuum device is respectively communicated with the top and two sides of the cavity through a plurality of groups of vacuum pipes; a cooling water pipe of the cold water device is communicated with the first microwave generator; and the cold water device is used for cooling the first microwave generator and the microwave power supply. The invention further discloses a liquid product drying process. The device is high in automation degree, high in efficiency and capable of continuously running for a long time.

Description

Technical Field

[0001] The invention relates to the technical field of microwave vacuum low-temperature drying equipment, in particular to a microwave vacuum low-temperature liquid continuous belt dryer and a drying process for liquid products. Background Art

[0002] Vacuum continuous liquid belt dryer is a kind of drying equipment with a wide range of applications. It is widely used in food, pharmaceutical, chemical and other industries. The existing vacuum continuous belt dryer uses steam, superheated water, thermal oil and other media as heat sources, and requires supporting infrastructure such as steam. Its heat transfer method mainly relies on conduction. The heat is transferred from the heating plate to the crawler, and then from the crawler to the material. The heat transfer coefficient is low, which seriously affects the drying efficiency. For heat-sensitive materials (such as Chinese medicine powder, etc.), due to the upper temperature limit, the temperature of the heating medium needs to be maintained at a low temperature to prevent damage to the internal molecular structure of the product to be evaporated, etc. Therefore, its drying efficiency will be lower. Therefore, technicians have developed a microwave vacuum low-temperature drying equipment, which can evaporate the moisture in the product to be dried at a low temperature, thereby achieving the purpose of drying.

[0003] The patent document with the patent publication number CN118031574A discloses a tunnel type microwave vacuum ultra-low temperature drying equipment and a material drying process, which is used for drying materials. The tunnel type microwave vacuum ultra-low temperature drying equipment includes: a main device, the main device includes a cavity and a plurality of first microwave generators, the cavity is a cylindrical structure, the cross-sectional shape of the cavity is a regular polygon, and the plurality of first microwave generators are respectively arranged on the outer wall surface of the cavity, and are arranged in sequence at least along the length direction of the cavity; a vacuum unit, the vacuum port of the vacuum unit is connected to the cavity through a pipeline; a chiller, the cooling water pipe of the chiller is connected to the first microwave generator, and the chiller is used to cool the first microwave generator. By utilizing the characteristics of microwave polar molecules oscillating and heating, the vacuum unit is used to evacuate the cavity, so that the water-containing material in the cavity is quickly evaporated at low temperature in a vacuum environment to achieve drying, the drying efficiency is high, and the material temperature can be prevented from being damaged due to excessive temperature. However, the invention has the following deficiencies: 1) The invention belongs to intermittent microwave low-temperature evaporation, that is, after evaporating a batch of products, the cavity needs to be opened and new products to be evaporated are fed in. Its continuity is not very high, and it is mainly aimed at the evaporation of solid products, especially packaging paper bag products; 2) It is not suitable for the evaporation of liquid products, especially continuous evaporation; 3) The requirements for the conveyor inside the cavity are not high.

[0004] In addition, the following issues need to be addressed for low-temperature concentration of liquids: 1) How to clean the inside of the cavity; 2) How to control the initial concentration of the liquid entering the vacuum cavity; 3) How to evenly distribute the liquid on the conveying mechanism to ensure the evaporation effect; 4) How to correct and clean the belt of the conveying mechanism; 5) How to collect and pack the dried product under vacuum; 6) How to drain the water in the water collection tank in a continuous vacuum environment; 7) How to save energy as much as possible. Summary of the invention

[0005] According to an embodiment of the present invention, a microwave vacuum low-temperature liquid continuous belt dryer is provided, comprising: A concentration device, through which the liquid product undergoes preliminary evaporation; A host device, the host device comprises a cavity and a plurality of belt conveyor modules; a plurality of groups of first microwave generators are arranged on the cavity, and the plurality of groups of first microwave generators are matched with the plurality of belt conveyor modules respectively; A material distribution device, which is connected with the concentration device and a plurality of belt conveyor modules respectively, and can evenly distribute the liquid product in the concentration device on the plurality of belt conveyor modules; The material collecting device is connected with several belt conveyor modules to collect and crush the dried products; A packaging device (prior art), the packaging device is connected to the collecting device and can pack the crushed product; A vacuum device, wherein the vacuum port of the vacuum device is respectively connected to the top and both sides of the cavity through a plurality of vacuum tubes; A cooling water device (prior art), wherein a cooling water pipe of the cooling water device is connected to the first microwave generator, and the cooling water device is used to cool the first microwave generator and its microwave power supply.

[0006] Further, the concentration device comprises: a raw material tank, at least one first microwave heating tank and at least one first evaporation tank; Raw material tanks are used to hold liquid products; A first support frame is arranged in the first microwave heating tank, a first coil is wound around the first support frame from bottom to top, the first coil is connected with the raw material tank, and the liquid product in the raw material tank can enter the first coil through a delivery pump; A plurality of second microwave generators are arranged on the first microwave heating tank; A spherical distributor is arranged in the first evaporation tank, a plurality of first nozzles are arranged on the spherical distributor, and the spherical distributor is connected to the first coil; the first evaporation tank is connected to an external vacuum device through a vacuum tube; a discharge port is arranged at the bottom of the first evaporation tank, and the liquid product after preliminary evaporation can return to the raw material tank through a pipeline from the discharge port or enter the next process; and / or The first microwave heating tanks and the first evaporation tanks are arranged alternately.

[0007] Furthermore, the host device further comprises: a cleaning module, a detection module, a pair of sealing doors and a pair of first driving modules; The cleaning module includes a water storage tank and several groups of cleaning nozzles. The water storage tank is connected to the several groups of cleaning nozzles through a water pipe, and the water in the water storage tank can be transported to the several groups of cleaning nozzles through a water pump; a nozzle fixing part that can be threadedly connected to the cleaning nozzle is provided on the cavity, and the cleaning nozzle is fixed inside the cavity through the nozzle fixing part; The detection module includes a plurality of pressure sensors, a plurality of temperature sensors, a plurality of cameras, a plurality of explosion-proof lamps and a plurality of first exhaust valves; the plurality of pressure sensors and the plurality of first exhaust valves are respectively arranged at the top of the cavity; the plurality of temperature sensors and the plurality of explosion-proof lamps are respectively arranged at the top and both sides of the cavity; the plurality of cameras are respectively arranged on the sealing door and arranged in sequence from top to bottom along the sealing door; A pair of sealing doors are arranged at both ends of the cavity to seal the cavity; the sealing doors are double-layered, and thermal insulation cotton is arranged between the double-layered doors; A pair of first driving modules is connected to a pair of sealing doors in a one-to-one correspondence, and can drive the sealing doors to open and close.

[0008] Further, the first driving module comprises: a first fixing frame, a first driving motor, a first driving shaft, a pair of first chains and a pair of second fixing frames; The first driving motor is connected to the first driving shaft and can drive the first driving shaft to rotate; A pair of first chains are arranged at two ends of the first driving shaft, and the first driving shaft can drive the pair of first chains to move; Both sides of the sealing door are respectively connected to a pair of second fixing frames through first guide rails for sliding, and a plurality of first driving cylinders are arranged on the second fixing frames, and the output ends of the first driving cylinders are connected to the sealing door to drive the forward and backward movement; A pair of second guide rails and a pair of third guide rails are provided on the first fixing frame, and the second guide rails are V-shaped; the pair of second guide rails and the pair of third guide rails correspond to the pair of second fixing frames one by one respectively; The second fixed frame is provided with a plurality of first pulleys, a fall arrester, a pair of elastic pull rods (existing technology), and a pair of first position sensors. A plurality of first pulleys are slidably connected to the second guide rail, and a V-shaped groove is provided on the first pulley; The anti-fall device is slidably connected to the third guide rail and is used for emergency braking of the sealed door; A pair of elastic pull rods are respectively connected to two ends of the first chain; A pair of first position sensors respectively correspond to the pair of elastic pull rods one by one and are used for detecting the positions of the pair of elastic pull rods.

[0009] Further, the belt conveyor module comprises: a third fixed frame, a second driving motor, a conveyor belt, a driving roller and a driven roller; The output end of the second driving motor is connected to the driving roller; the conveying belt is connected to the driving roller and the driven roller respectively; the driving roller and the driven roller are respectively arranged at two ends of the third fixing frame; the second driving motor is arranged outside the cavity and connected to the cavity through a magnetic fluid sealing structure; A pair of first limiting strips are arranged at the upper end of the conveyor belt, and a pair of second limiting strips are arranged at the lower end thereof, and the first limiting strips and the second limiting strips are of the same length as the conveyor belt; The driving roller and the driven roller are provided with a first annular groove coupled with the second limiting strip.

[0010] Furthermore, the belt conveyor module further comprises: a plurality of first support rollers, a pair of first adjusting rollers, a second adjusting roller, a plurality of first support plates, a cooling plate and a scraper; A plurality of first support rollers are respectively connected to the third fixing frame and are arranged below the conveyor belt, and the top of the first support roller is placed between a pair of first limit strips; A pair of first adjusting rollers are respectively connected to the third fixing frame and are arranged between the upper and lower layers of the conveyor belt, and the bottom of the first adjusting roller is placed between the pair of second limiting strips; The second adjusting roller is located below the conveyor belt and is arranged between the pair of first adjusting rollers. The top of the second adjusting roller is located between the pair of first limiting strips. Both ends of the second adjusting roller are connected to the third fixing frame through a pair of first adjusting bolts. The first adjusting bolts can adjust the upper and lower positions of the second adjusting roller. A plurality of first support plates are sequentially arranged below the upper conveyor belt and between a pair of second limit strips of the upper conveyor belt to support and limit the conveyor belt; The first support plate is provided with a plurality of first water leakage holes; The cooling plate is arranged adjacent to the first support plate, is disposed below the output end of the conveyor belt, and is connected to an external cooling device; Both ends of the scraper are connected to the third fixing frame and are arranged at the output end of the conveyor belt to separate the dried product from the conveyor belt.

[0011] Further, the material distribution device comprises: a first material storage tank, a first rotor pump and a plurality of first screw pumps, a material distribution frame and a material distribution drive motor; The first storage tank is connected to the concentration device and is used to store the concentrated liquid product; The first rotor pump is respectively connected with the first storage tank and the plurality of first screw pumps, and transports the liquid product to the plurality of first screw pumps through the pipeline; The cloth driving motor is arranged at the top of the cavity, and its output end is connected to the cloth frame, which can drive the cloth frame to swing back and forth; The material distribution frame is arranged at the input end of the belt conveyor module, and a plurality of swing rods are arranged on the frame, and a material distribution nozzle is arranged on the swing rod, and the plurality of swing rods correspond to the plurality of belt conveyor modules; A plurality of first screw pumps are respectively connected to the material distributing nozzles on a plurality of swing arms through pipelines.

[0012] Further, the material collecting device comprises: a first driving mechanism, a crushing rack, a first screw conveyor, a hammer mill, a second screw conveyor, a pneumatic butterfly valve, a first blower and a second storage tank; The first driving mechanism is arranged at the top of the cavity, and its output end is connected to the crushing frame, and can drive the crushing frame to move up and down; The chip rack is arranged at the output end of the belt conveyor module, and comprises a plurality of chip boards, and the plurality of chip boards correspond to the plurality of belt conveyor modules one by one; The first screw conveyor is arranged below the crushing rack and connected with the output end of the belt conveyor module to convey the dried product out of the cavity; The hammer mill is connected to the first screw conveyor and is used to crush the product; the motor of the hammer mill and the crushing bin are sealed by a magnetic fluid sealing structure; A pneumatic butterfly valve, through which the second screw conveyor is connected to the first blower; One end of the second screw conveyor is connected to the hammer mill, and the other end is connected to the second storage tank through the first blower, so as to convey the crushed product into the second storage tank; the second storage tank is connected to the packaging device.

[0013] Further, the packaging device includes: a material suction mechanism (prior art) and an automatic packaging machine (prior art); The suction mechanism draws the material from the second storage tank and sends it to the automatic packaging machine for packaging.

[0014] Further, it also includes an ultra-low temperature water capture system (prior art) and a water collection tank; The ultra-low temperature water capture system includes a refrigeration unit, a heat exchanger, an evaporator and a condenser. The vacuum port of the vacuum device is connected to the cavity after passing through the condenser and evaporator of the ultra-low temperature water capture system. The water collecting tank is divided into an upper water collecting chamber and a lower water collecting chamber. The top of the upper water collecting chamber is respectively connected to the condenser and the vacuum pipe of the vacuum device; the lower water collecting chamber is connected to the condenser through a first connecting pipe, and a first control valve is arranged on the first connecting pipe; The bottom of the upper water collecting chamber and the top of the lower water collecting chamber are connected through a second connecting pipe, and a second control valve is arranged on the second connecting pipe; A liquid level gauge and a second exhaust valve are arranged on one side of the lower water collecting chamber, a drainage pump is connected to the bottom thereof, and a third control valve is arranged between the drainage pump and the lower water collecting chamber.

[0015] According to another embodiment of the present invention, a drying process for a liquid product is provided, wherein the drying is performed using the microwave vacuum low-temperature liquid continuous belt dryer of the previous embodiment; the drying process comprises the following steps: S1. The product enters the concentration equipment for preliminary concentration; S2, the concentrated product enters the microwave vacuum drying chamber for drying; S3, cooling, crushing and collecting the dried product; S4. Put the collected products into an automatic packaging machine for packaging.

[0016] The beneficial effects of the embodiments of the present invention are as follows: 1) It is suitable for drying liquid products, and adopts vacuum microwave concentration drying to reduce the drying temperature of liquid products, avoiding the damage of high temperature drying to the molecular structure or performance of products; 2) A limit strip is set on the conveying belt, and the automatic deviation correction cylinder is removed, which simplifies the structure, reduces the consumption of electric energy, and avoids the interference of the deviation correction cylinder with the microwave in the cavity when it is working; 3) The cleaning nozzle is set on the cavity wall, and the spray rack is not set in the cavity, which also avoids the interference of the spray rack with the microwave; 4) The concentration device is adopted to control the concentration of the liquid product entering the cavity; 5) The first rotor pump is set in the distribution device to adjust the flow rate of the liquid product entering the first screw pumps to be the same, so that the injection flow rate of each distribution nozzle is consistent; 6) The sealing door adopts the up and down movement mode to reduce the occupied area; At the same time, the anti-falling mechanism and the induction mechanism are adopted to prevent the sealing door from falling, and to prevent the first drive motor from continuing to rotate after falling; 7) It can operate continuously for a long time, and the water in the water collector does not need to be stopped when it is discharged; 8) The degree of automation is high, and the dried products can be output, crushed, collected and packaged in time.

[0017] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a partial structural schematic diagram of a microwave vacuum low-temperature liquid continuous belt dryer according to an embodiment of the present invention; Figure 2 is a first structural schematic diagram of a host device according to an embodiment of the present invention; Figure 3 for Figure 2 The main view of Figure 4 for Figure 3 AA section view; Figure 5 for Figure 4 A magnified image of point A; Figure 6 for Figure 4 A magnified view of point B; Figure 7 is a schematic structural diagram of a concentrating device according to an embodiment of the present invention; Figure 8 is a schematic structural diagram of a first microwave heating tank according to an embodiment of the present invention; Fig. 9 is a schematic diagram of the internal structure of a concentration device according to an embodiment of the present invention; Fig.10 is a partial enlarged view of the cavity surface according to an embodiment of the present invention; Fig.11 is a schematic structural diagram of a material distribution device according to an embodiment of the present invention; Fig.12 It is a schematic structural diagram of several belt conveyor modules according to an embodiment of the present invention; Fig.13 for Fig.12 The main view; Fig.14 for Fig.13 AA section view; Fig.15 for Fig.14 The enlarged view of point E; Fig.16 for Fig.13 BB section view; Fig.17 A top view of a belt conveyor module according to an embodiment of the present invention after the conveyor belt is removed; Fig.18 is a schematic diagram of the structure between the first adjusting roller, the second adjusting roller and the conveying belt according to an embodiment of the present invention; Fig.19 A partial enlarged view of the output end of the belt conveyor module according to an embodiment of the present invention; Fig. 20 is a partial structural schematic diagram of a material collecting device according to an embodiment of the present invention; Fig.21 is an assembly diagram between a sealing door and a first driving module according to an embodiment of the present invention; Fig. 22 for Fig.21 The enlarged view of point F; Fig.23 for Fig.21 The main view; Fig.24 for Fig.21 A top view of Fig.25 It is a partial enlarged view between the sealing door and the first driving module; Fig.26 A schematic diagram of a water collecting tank connected to a vacuum device and a condenser according to an embodiment of the present invention; Fig. 27 is a schematic structural diagram of a water collecting tank according to an embodiment of the present invention; Fig.28 Schematic diagram of the internal structure of a water collecting tank according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings to further illustrate the present invention.

[0020] First, combine Figures 1 to 28 The microwave vacuum low-temperature liquid continuous belt dryer according to an embodiment of the present invention is described, which is used in the chemical, food, pharmaceutical and other industries and has a wide range of application scenarios.

[0021] like Figures 1 to 28 As shown, the microwave vacuum low-temperature liquid continuous belt dryer according to the embodiment of the present invention comprises: Concentrator 1, the liquid product is initially evaporated through the concentrator 1; The host device 2 comprises a cavity 21 and a plurality of belt conveyor modules 22; a plurality of groups of first microwave generators 23 are arranged on the cavity 21, and the plurality of groups of first microwave generators 23 are matched with the plurality of belt conveyor modules 22 respectively; A material distribution device 28, which is connected to the concentration device 1 and the plurality of belt conveyor modules 22 respectively, and can evenly distribute the liquid product in the concentration device 1 on the plurality of belt conveyor modules 22; A material collecting device 29, which is connected to a plurality of belt conveyor modules 22, can collect and crush the dried product; The packaging device 5 is connected with the collecting device 29 and can pack the crushed product; A vacuum device 6, wherein the vacuum port of the vacuum device 6 is respectively connected to the top and both sides of the cavity 21 through a plurality of vacuum tubes 61; The cooling water device 7, the cooling water pipe of the cooling water device 7 is connected with the first microwave generator 23, and the cooling water device 7 is used to cool the first microwave generator 23 and the microwave power supply thereof.

[0022] Further, if Figures 7-9 As shown, in this embodiment, the concentration device 1 comprises: a raw material tank 11, at least one first microwave heating tank 12 and at least one first evaporation tank 13; The raw material tank 11 is used to hold liquid products; A first support frame 121 is provided in the first microwave heating tank 12. A first coil 122 is wound around the first support frame 121 from bottom to top. The first coil 122 is connected to the raw material tank 11. The liquid product in the raw material tank 11 can enter the first coil 122 through a delivery pump. A plurality of second microwave generators 123 are disposed on the first microwave heating tank 12, and the second microwave generators 123 perform microwave heating on the first microwave heating tank 12; A spherical distributor 131 is provided in the first evaporation tank 13, and a plurality of first nozzles 1311 are provided on the spherical distributor 131. The spherical distributor 131 is connected to the first coil 122, and the first evaporation tank 13 is connected to an external vacuum device through a vacuum tube. When working, the first evaporation tank 13 is in a vacuum state, and after the liquid product heated by microwaves is sprayed into the first evaporation tank 13, part of the water in the liquid product flashes and becomes water vapor and is sucked away by the external vacuum device. A discharge port is provided at the bottom of the first evaporation tank 13, and the liquid product after preliminary evaporation can be returned to the raw material tank 11 through a pipeline from the discharge port or enter the next process. When there is only one evaporation tank, the product can be sent back to the raw material tank 11 for secondary evaporation and drying, and can directly enter the next process when the product concentration is qualified; and / or The first microwave heating tanks 12 and the first evaporation tanks 13 are arranged alternately, and the number of the first microwave heating tanks 12 and the first evaporation tanks 13 can be selected according to demand or site space.

[0023] Further, if Figures 1 to 4 , 21 to 25, in this embodiment, the host device 2 further includes: a cleaning module 24, a detection module 25, a pair of sealing doors 26 and a pair of first driving modules 27; The cleaning module 24 includes a water storage tank 241 and a plurality of cleaning nozzles 242. The water storage tank 241 is connected to the plurality of cleaning nozzles 242 through a water pipe. The water in the water storage tank 241 can be transported to the plurality of cleaning nozzles 242 through a water pump. The water pump is connected to the cleaning nozzles 242 through a water pipe. A nozzle fixing part 243 that can be threadedly connected to the cleaning nozzles 242 is provided on the cavity 21. The cleaning nozzles 242 are fixed inside the cavity 21 through the nozzle fixing part 243, so that the nozzles are detachably arranged on the inner wall of the cavity 21. The detection module 25 includes a plurality of pressure sensors 251, a plurality of temperature sensors 252, a plurality of cameras 253, a plurality of explosion-proof lamps 254 and a plurality of first exhaust valves; the plurality of pressure sensors 251 and the plurality of first exhaust valves are respectively arranged at the top of the cavity 21; the plurality of temperature sensors 252 and the plurality of explosion-proof lamps 254 are respectively arranged at the top and both sides of the cavity 21; the plurality of cameras 253 are respectively arranged on the sealing door 26, and are arranged in sequence from top to bottom along the sealing door 26, corresponding to the plurality of belt conveyor modules 22, so as to detect the drying condition of the products on the corresponding belt conveyor modules 22; A pair of sealing doors 26 are arranged at both ends of the cavity 21 to seal the cavity 21; the sealing doors 26 are double-layered, and thermal insulation cotton is arranged between the double-layered doors; A pair of first driving modules 27 and a pair of sealing doors 26 are connected in a one-to-one correspondence, and can drive the sealing doors 26 to open and close.

[0024] Further, if Figures 21 to 25 As shown, in this embodiment, the first driving module 27 includes: a first fixing frame 271, a first driving motor 272, a first driving shaft 273, a pair of first chains 274 and a pair of second fixing frames 275; The first driving motor 272 is connected to the first driving shaft 273 and can drive the first driving shaft 273 to rotate; A pair of first chains 274 are disposed at both ends of the first driving shaft 273, and the first driving shaft 273 can drive the pair of first chains 274 to move; The two sides of the sealing door 26 are respectively connected to a pair of second fixing frames 275 through first guide rails 2751 for sliding. The second fixing frames 275 are provided with a plurality of first driving cylinders 2752. The output ends of the first driving cylinders 2752 are connected to the sealing door 26 to drive the sealing door 26 to move forward and backward, so that the sealing door 26 is close to the seal or away from the cavity 21. A pair of second guide rails 2711 and a pair of third guide rails 2712 are provided on the first fixing frame 271, and the second guide rails 2711 are V-shaped; the pair of second guide rails 2711 and the pair of third guide rails 2712 correspond to the pair of second fixing frames 275 one by one respectively; The second fixing frame 275 is provided with a plurality of first pulleys 2753, a fall arrester 2754, a pair of elastic pull rods 2755, and a pair of first position sensors 2756. A plurality of first pulleys 2753 are slidably connected to the second guide rail 2711 , and a V-shaped groove is provided on the first pulley 2753 , and the V-shaped groove is slidably coupled to the second guide rail 2711 ; The anti-fall device 2754 is slidably connected to the third guide rail 2712 and is used for emergency braking of the sealing door 26 to prevent the sealing door 26 from falling; A pair of elastic pull rods 2755 are respectively connected to the two ends of the first chain 274, and the first chain 274 can drive the second fixing frame 275 to move up and down through the pair of elastic pull rods 2755; A pair of first position sensors 2756 correspond one-to-one to a pair of elastic pull rods 2755, and are communicated with the first drive motor 272 for detecting the position of the pair of elastic pull rods 2755; the elastic pull rod 2755 includes a pull rod and a spring. When the chain is tensioned, the pull rod is tightened and the spring is stretched or compressed; when the first chain 274 breaks, the pull rod is reset due to the spring force, and the position sensor detects and transmits it to the first drive motor 272, which shuts down and avoids a secondary accident.

[0025] Further, if Figures 4 to 6, 12 to 19, in this embodiment, the belt conveyor module 22 includes: a third fixing frame 221, a second driving motor 222, a conveyor belt 223, an active roller 224 and a driven roller 225; The output end of the second driving motor 222 is connected to the driving roller 224; the conveying belt 223 is connected to the driving roller 224 and the driven roller 225 respectively; the driving roller 224 and the driven roller 225 are respectively arranged at two ends of the third fixed frame 221; A pair of first limiting strips 2231 are provided at the upper end of the conveying belt 223, and a pair of second limiting strips 2232 are provided at the lower end thereof. The first limiting strips 2231 and the second limiting strips 2232 are of the same length as the conveying belt 223; the pair of first limiting strips 2231 are used to prevent the liquid product from escaping from the conveying belt 223; The driving roller 224 and the driven roller 225 are provided with a first annular groove 2241 coupled with the second limiting strip 2232 to prevent the conveying belt 223 from deviating from the driving roller 224 or the driven roller 225 .

[0026] Further, if Figures 16 to 19 As shown, in this embodiment, the belt conveyor module 22 further includes: a plurality of first support rollers 226, a pair of first adjustment rollers 227, a second adjustment roller 228, a plurality of first support plates 2210, a cooling plate 2211 and a scraper; A plurality of first support rollers 226 are respectively connected to the third fixing frame 221 and are arranged below the conveying belt 223. The top of the first support roller 226 is placed between a pair of first limiting bars 2231. A pair of first adjusting rollers 227 are respectively connected to the third fixing frame 221 and are arranged between the upper and lower layers of the conveying belt 223. The bottom of the first adjusting roller 227 is placed between a pair of second limiting strips 2232. The second adjusting roller 228 is located below the conveying belt 223 and is disposed between the pair of first adjusting rollers 227. The top of the second adjusting roller 228 is located between the pair of first limiting bars 2231. Both ends of the second adjusting roller 228 are connected to the third fixing frame 221 through a pair of first adjusting bolts 229. The first adjusting bolts 229 can adjust the upper and lower positions of the second adjusting roller 228. A plurality of first support plates 2210 are sequentially arranged below the upper conveyor belt 223 and between a pair of second limit bars 2232 of the upper conveyor belt 223 to support and limit the conveyor belt 223; The first support plate 2210 is provided with a plurality of first water leakage holes, which facilitate water to flow out when the machine is shut down for cleaning; The cooling plate 2211 is arranged adjacent to the first support plate 2210, is disposed below the output end of the conveyor belt 223, and is connected to an external cooling device. When the product is completely dried, it is cooled by the cooling plate 2211; Both ends of the scraper are connected to the third fixing frame 221 and are arranged at the output end of the conveyor belt 223 to separate the dried product from the conveyor belt 223 .

[0027] Further, if Figure 1 , 11 As shown, in this embodiment, the material distribution device 28 includes: a first material storage tank (not shown in the figure), a first rotor pump 282 and a plurality of first screw pumps 283, a material distribution frame 284 and a material distribution drive motor 285; The first storage tank is connected to the concentration device 1 and is used to store the concentrated liquid product; The first rotor pump 282 is respectively connected to the first storage tank and the plurality of first screw pumps 283, and transports the liquid product to the plurality of first screw pumps 283 through pipelines; The cloth driving motor 285 is arranged at the top of the cavity 21, and its output end is connected to the cloth rack 284, and can drive the cloth rack 284 to swing back and forth; The material distribution frame 284 is arranged at the input end of the belt conveyor module 22, and is provided with a plurality of swing rods 2841, on which a material distribution nozzle 2842 is arranged, and the plurality of swing rods 2841 corresponds to the plurality of belt conveyor modules 22; A plurality of first screw pumps 283 are connected to corresponding material distribution nozzles 2842 on a plurality of rocker arms 2841 through pipelines; the first rotor pump 282 provides a certain pressure so that the pressure of the liquid material entering each first screw pump 283 is the same, thereby playing a role of equalizing pressure and preventing the microwave drying effect from being affected by the different flow rates of each material distribution nozzle 2842 due to gravity.

[0028] Further, if Figure 6 , 20 As shown, in this embodiment, the material collecting device 29 comprises: a first driving mechanism 291, a crushing rack 292, a first screw conveyor 293, a hammer mill 294, a second screw conveyor 295, a pneumatic butterfly valve (not shown in the figure), a first air shut-off fan 296 and a second material storage tank 297; The first driving mechanism 291 is disposed at the top of the cavity 21, and its output end is connected to the crushing frame 292, and can drive the crushing frame 292 to move up and down; The chip rack 292 is disposed at the output end of the belt conveyor module 22 and includes a plurality of chip boards 2921 , and the plurality of chip boards 2921 correspond to the plurality of belt conveyor modules 22 one by one; The first screw conveyor 293 is disposed below the crushing rack 292 and connected to the output end of the belt conveyor module 22 to convey the dried product out of the cavity 21; The hammer mill 294 is connected to the first screw conveyor 293 and is used to crush the product; the motor of the hammer mill 294 and the crushing chamber are sealed by a magnetic fluid sealing structure 2941; Pneumatic butterfly valve, the second screw conveyor 295 is connected to the first air shut-off fan 296 through the pneumatic butterfly valve; One end of the second screw conveyor 295 is connected to the hammer mill 294 , and the other end is connected to the second storage tank 297 through the first blower 296 , so as to convey the crushed product into the second storage tank 297 ; the second storage tank 297 is connected to the packaging device 5 .

[0029] In the initial state, the pneumatic butterfly valve is in a closed state. When the hammer mill 294 is working, the pneumatic butterfly valve opens, and the crushed materials enter the second storage tank 297 through the first blower 296.

[0030] Further, if Figure 1 As shown, in this embodiment, the packaging device 5 includes: a suction mechanism 51 and an automatic packaging machine 52; The suction mechanism 51 draws the material from the second material storage tank 297 and sends it to the automatic packaging machine 52 for packaging.

[0031] Further, if Figure 1 , 26 As shown in Figure 28, in this embodiment, an ultra-low temperature water capture system 3 (existing technology) and a water collection tank 4 are also included; The ultra-low temperature water capture system 3 includes a refrigeration unit, a heat exchanger, an evaporator and a condenser 31. The vacuum port of the vacuum device 6 is connected to the cavity 21 after passing through the condenser 31 and the evaporator of the ultra-low temperature water capture system 3. The water collecting tank 4 is divided into an upper water collecting chamber 41 and a lower water collecting chamber 42. The top of the upper water collecting chamber 41 is respectively connected to the condenser 31 and the vacuum tube of the vacuum device 6; the lower water collecting chamber 42 is connected to the condenser 31 through a first connecting pipe 43. The first connecting pipe 43 is provided with a first control valve 44, and the first control valve 44 is used to control the on-off of the first connecting pipe 43; The bottom of the upper water collecting chamber 41 and the top of the lower water collecting chamber 42 are connected through a second connecting pipe 45, and a second control valve 46 is provided on the second connecting pipe. The second control valve 46 is used to control the opening and closing of the second connecting pipe 45; A liquid level gauge 47 and a second exhaust valve 410 are provided on one side of the lower water collecting chamber 42, a drainage pump 48 is connected to the bottom thereof, and a third control valve 49 is provided between the drainage pump 48 and the lower water collecting chamber 42, and the third control valve 49 is used to control the connection and disconnection between the lower water collecting chamber and the drainage pump 48; During operation, the upper water collecting chamber 41 and the lower water collecting chamber 42 are both in a vacuum state, the first control valve 44 and the second control valve 46 are opened, and the third control valve 49 is closed; the vacuum device 6 extracts water vapor from the cavity 21 and condenses and liquefies it through the condenser 31, and the liquefied water flows into the upper water collecting chamber 41 and enters the lower water collecting chamber 42 through the second connecting pipe 45; when the liquid level meter 47 detects that the water in the lower water collecting chamber 42 reaches a predetermined position, the first control valve 44 and the second control valve 46 are closed, and the second exhaust valve 410 is opened. When the pressure in the lower water collecting chamber 42 returns to normal, the third control valve 49 is opened, and the drainage pump 48 discharges the water in the lower water collecting chamber 42; then the third control valve 49 is closed, the first control valve 44 is opened, and after the lower water collecting chamber 42 returns to a vacuum state, the second control valve 46 is opened, and the water in the upper water collecting chamber 41 continues to flow into the lower water collecting chamber 42 due to gravity.

[0032] According to another embodiment of the present invention, a drying process for a liquid product is provided, wherein the drying is performed using the microwave vacuum low-temperature liquid continuous belt dryer of the previous embodiment; the drying process comprises the following steps: S1. The product enters the concentration equipment for preliminary concentration; S2, the concentrated product enters the microwave vacuum drying cavity 21 for drying; S3, cooling, crushing and collecting the dried product; S4, putting the collected products into the automatic packaging machine 52 for packaging.

[0033] Working principle: First, the sealing door 26 is closed, and the first evaporation tank 13 and the cavity 21 are evacuated into a vacuum state; then, the liquid product is placed in the raw material tank 11, and then enters the first microwave heating tank 12 for microwave heating, and then enters the first evaporation tank 13 in a vacuum state through the spherical distributor 131 to achieve flash evaporation; when the liquid product reaches a predetermined concentration, it enters the cavity 21 through the distributor 28, and is evenly arranged on the corresponding conveyor belt 223, is dried on the conveyor belt 223, and then is cooled by the cooling plate, and then enters the first screw conveyor 293 for output, is crushed by the hammer mill 294, and then enters the second storage tank 297, and then enters the packaging device 5 from the second storage tank 297 for packaging.

[0034] Above, refer to Figures 1 to 28 The invention describes a microwave vacuum low-temperature liquid continuous belt dryer and a drying process for liquid products according to an embodiment of the invention, which have high automation, high efficiency and can operate continuously for a long time.

[0035] It should be noted that, in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the present invention. After reading the above content, it will be apparent to those skilled in the art that various modifications and substitutions of the present invention will occur. Therefore, the protection scope of the present invention should be limited by the appended claims.

Claims

1. A microwave vacuum low-temperature liquid continuous belt dryer, characterized in that: Include: a concentrating device through which the liquid product is initially evaporated; A host device, the host device comprises a cavity and a plurality of belt conveyor modules; the cavity is provided with a plurality of groups of first microwave generators, the plurality of groups of first microwave generators are matched with the plurality of belt conveyor modules respectively; A material distribution device, wherein the material distribution device is connected with the concentration device and the plurality of belt conveyor modules respectively, and can evenly distribute the liquid product in the concentration device on the plurality of belt conveyor modules; A material collecting device, which is connected to the plurality of belt conveyor modules and can collect and crush the dried product; A packaging device, which is connected to the collecting device and can pack the crushed product; A vacuum device, wherein the vacuum port of the vacuum device is respectively connected to the top and both sides of the cavity through a plurality of vacuum tubes; A cooling water device, wherein a cooling water pipe of the cooling water device is connected to the first microwave generator, and the cooling water device is used to cool the first microwave generator and its microwave power supply.

2. The microwave vacuum low-temperature liquid continuous belt dryer according to claim 1, characterized in that: The concentrating device comprises: a raw material tank, at least one first microwave heating tank and at least one first evaporation tank; The raw material tank is used to hold the liquid product; A first support frame is provided in the first microwave heating tank, a first coil is wound around the first support frame from bottom to top, the first coil is connected to the raw material tank, and the liquid product in the raw material tank can enter the first coil through a delivery pump; The first microwave heating tank is provided with a plurality of second microwave generators; A spherical distributor is provided in the first evaporation tank, a plurality of first nozzles are provided on the spherical distributor, and the spherical distributor is connected to the first coil; the first evaporation tank is connected to an external vacuum device through a vacuum tube; a discharge port is provided at the bottom of the first evaporation tank, and the liquid product after preliminary evaporation can be returned to the raw material tank through a pipeline from the discharge port or enter the next process; and / or The first microwave heating tanks and the first evaporation tanks are arranged alternately.

3. The microwave vacuum low-temperature liquid continuous belt dryer according to claim 1, characterized in that: The host device further comprises: a cleaning module, a detection module, a pair of sealing doors and a pair of first driving modules; The cleaning module comprises a water storage tank and a plurality of cleaning nozzles, wherein the water storage tank is connected to the plurality of cleaning nozzles through a water pipe, and the water in the water storage tank can be transported to the plurality of cleaning nozzles through a water pump; a nozzle fixing part which can be threadedly connected to the cleaning nozzle is provided on the cavity, and the cleaning nozzle is fixed inside the cavity through the nozzle fixing part; The detection module comprises a plurality of pressure sensors, a plurality of temperature sensors, a plurality of cameras, a plurality of explosion-proof lamps and a plurality of first exhaust valves; the plurality of pressure sensors and the plurality of first exhaust valves are respectively arranged at the top of the cavity; the plurality of temperature sensors and the plurality of explosion-proof lamps are respectively arranged at the top and both sides of the cavity; the plurality of cameras are respectively arranged on the sealing door and are arranged in sequence from top to bottom along the sealing door; The pair of sealing doors are arranged at both ends of the cavity, and are used to seal the cavity; the sealing doors are double-layered, and thermal insulation cotton is arranged between the double-layered doors; The pair of first driving modules are connected to the pair of sealing doors in a one-to-one correspondence, and can drive the sealing doors to open and close.

4. The microwave vacuum low-temperature liquid continuous belt dryer according to claim 3, characterized in that: The first driving module comprises: a first fixing frame, a first driving motor, a first driving shaft, a pair of first chains and a pair of second fixing frames; The first driving motor is connected to the first driving shaft and can drive the first driving shaft to rotate; The pair of first chains are arranged at two ends of the first driving shaft, and the first driving shaft can drive the pair of first chains to move; Both sides of the sealing door are respectively slidably connected with the pair of second fixing frames through first guide rails, and a plurality of first driving cylinders are arranged on the second fixing frames, and the output ends of the first driving cylinders are connected with the sealing door to drive the forward and backward movement; A pair of second guide rails and a pair of third guide rails are provided on the first fixing frame, and the second guide rails are V-shaped; The second fixing frame is provided with a plurality of first pulleys, a fall arrester, a pair of elastic pull rods, and a pair of first position sensors. The plurality of first pulleys are slidably connected to the second guide rail, and the first pulleys are provided with V-shaped grooves; The fall arrester is slidably connected to the third guide rail and is used for emergency braking of the sealed door; The pair of elastic pull rods are respectively connected to two ends of the first chain; The pair of first position sensors respectively correspond to the pair of elastic pull rods one by one and are used for detecting the positions of the pair of elastic pull rods.

5. The microwave vacuum low-temperature liquid continuous belt dryer according to claim 1, characterized in that: The belt conveyor module comprises: a third fixed frame, a second driving motor, a conveyor belt, a driving roller and a driven roller; The output end of the second driving motor is connected to the active roller; the conveying belt is connected to the active roller and the driven roller respectively; the active roller and the driven roller are respectively arranged at two ends of the third fixed frame; A pair of first limiting strips are arranged at the upper end of the conveyor belt, and a pair of second limiting strips are arranged at the lower end thereof, wherein the first limiting strips and the second limiting strips are of the same length as the conveyor belt; The active roller and the driven roller are provided with a first annular groove coupled with the second limiting strip.

6. The microwave vacuum low-temperature liquid continuous belt dryer according to claim 5, characterized in that: The belt conveyor module further comprises: a plurality of first supporting rollers, a pair of first adjusting rollers, a second adjusting roller, a plurality of first supporting plates, a cooling plate and a scraper; The plurality of first support rollers are respectively connected to the third fixing frame and are arranged below the conveyor belt, and the top of the first support roller is placed between the pair of first limiting strips; The pair of first adjusting rollers are respectively connected to the third fixing frame and are arranged between the upper and lower layers of the conveyor belt, and the bottom of the first adjusting roller is placed between the pair of second limiting strips; The second adjusting roller is located below the conveying belt and is disposed between the pair of first adjusting rollers, with its top located between the pair of first limiting strips, and its two ends are respectively connected to the third fixing frame through a pair of first adjusting bolts, and the first adjusting bolts can adjust the upper and lower positions of the second adjusting roller; A plurality of first support plates are sequentially arranged below the conveyor belt of the upper layer and between a pair of second limit strips of the conveyor belt of the upper layer, so as to support and limit the conveyor belt; The first support plate is provided with a plurality of first water leakage holes; The cooling plate is arranged adjacent to the first support plate, is disposed below the output end of the conveyor belt, and is connected to an external cooling device; The two ends of the scraper are connected to the third fixing frame and are arranged at the output end of the conveyor belt to separate the dried product from the conveyor belt.

7. The microwave vacuum low-temperature liquid continuous belt dryer according to claim 1, characterized in that: The material distribution device comprises: a first material storage tank, a first rotor pump and a plurality of first screw pumps, a material distribution frame and a material distribution drive motor; The first storage tank is connected to the concentration device and is used to store the concentrated liquid product; The first rotor pump is respectively connected to the first storage tank and the plurality of first screw pumps, and transports the liquid product to the plurality of first screw pumps through pipelines; The material distribution drive motor is arranged at the top of the cavity, and its output end is connected to the material distribution frame, and can drive the material distribution frame to swing back and forth; The material distribution frame is arranged at the input end of the belt conveyor module, and is provided with a plurality of swing rods, on which a material distribution nozzle is arranged, and the plurality of swing rods respectively correspond to the plurality of belt conveyor modules; The plurality of first screw pumps are respectively connected to the material distributing nozzles on the plurality of swing arms through pipelines.

8. The microwave vacuum low-temperature liquid continuous belt dryer according to claim 1, characterized in that: The material collecting device comprises: a first driving mechanism, a crushing rack, a first screw conveyor, a hammer mill, a second screw conveyor, a pneumatic butterfly valve, a first air shut-off fan and a second material storage tank; The first driving mechanism is arranged at the top of the cavity, and its output end is connected to the crushing frame, and can drive the crushing frame to move up and down; The chip rack is arranged at the output end of the belt conveyor module, and comprises a plurality of chip boards, and the plurality of chip boards correspond to the plurality of belt conveyor modules one by one; The first screw conveyor is arranged below the crushing rack and connected with the output end of the belt conveyor module, and is used to convey the dried product out of the cavity; The hammer mill is connected to the first screw conveyor and is used to crush the product; the motor of the hammer mill and the crushing bin are sealed by a magnetic fluid sealing structure; A pneumatic butterfly valve, through which the second screw conveyor is connected to the first blower; One end of the second screw conveyor is connected to the hammer mill, and the other end is connected to the second storage tank through the first air shut-off fan, so as to convey the crushed product into the second storage tank.

9. The microwave vacuum low-temperature liquid continuous belt dryer according to claim 1, characterized in that: It also includes an ultra-low temperature water capture system and water collection tanks; The ultra-low temperature water capture system includes a refrigeration unit, a heat exchanger, an evaporator and a condenser, and the vacuum port of the vacuum device is connected to the cavity after passing through the condenser and evaporator of the ultra-low temperature water capture system; The water collecting tank is divided into an upper water collecting chamber and a lower water collecting chamber, the top of the upper water collecting chamber is respectively connected to the condenser and the vacuum pipe of the vacuum device; the lower water collecting chamber is connected to the condenser through a first connecting pipe, and the first connecting pipe is provided with a first control valve; The bottom of the upper water collecting chamber and the top of the lower water collecting chamber are connected through a second connecting pipe, and a second control valve is provided on the second connecting pipe; A liquid level gauge and a second exhaust valve are arranged on one side of the lower water collecting chamber, a drainage pump is connected to the bottom thereof, and a third control valve is arranged between the drainage pump and the lower water collecting chamber.

10. A drying process for liquid products, using the microwave vacuum low-temperature liquid continuous belt dryer as claimed in any one of claims 1 to 9 for drying, characterized in that: The following steps are involved: S1. The product enters the concentration equipment for preliminary concentration; S2, the concentrated product enters the microwave vacuum drying chamber for drying; S3, cooling, crushing and collecting the dried product; S4. Put the collected products into an automatic packaging machine for packaging.

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