CN211782291U - Microwave drying equipment for preventing materials from being excessively dried and ignited and enabling microorganisms to reach standards - Google Patents

Abstract

A microwave drying device for preventing materials from being excessively dried and catching fire and enabling microorganisms to reach the standard comprises a pre-humidifying device, a conveyor belt and a microwave drying oven, wherein the pre-humidifying device comprises a box body, a feeding bin, a baffle plate, a steam pipe network and a swing mechanism, at least two baffle plates are arranged in the box body from top to bottom, the steam pipe network comprises a steam main pipe, a steam branch pipe and a steam nozzle, and the steam injection direction of the steam nozzle points to the free end of the baffle plate. The water content and the microorganism content reach the standard, the original color, nutrition and flavor of the vegetables can be kept, the energy consumption is low, and the efficiency is high.

Description

Microwave drying equipment for preventing materials from being excessively dried and ignited and enabling microorganisms to reach standards

Technical Field

The utility model relates to a dehydrated vegetable production facility technical field, in particular to prevent that too dry of material catches fire and microorganism microwave drying equipment up to standard.

Background

The dehydrated vegetable is also called rehydrated vegetable, which is a dried vegetable prepared by processing and manufacturing fresh vegetables through washing, drying and the like and removing most of water in the vegetables. The original color and nutrient components of the vegetables are basically kept unchanged. The vegetable can be easily stored and transported, and the season of vegetable production is effectively adjusted, and when the vegetable is eaten, the vegetable can be recovered by only immersing the vegetable in clean water, and the original color, nutrition and flavor of the vegetable are kept. The vegetables are high-moisture materials, the moisture content of the vegetables is more than 80 percent mostly, and the moisture content of the vegetables is more than 90-95 percent, the moisture content of the vegetables exists in 3 different states of free water, colloid bound water and chemical bound water, and most of the free water and the colloid bound water are removed in the drying process. Chemically bound water is water chemically bound to a solid, and water is present in the molecules of the material and generally cannot be removed by drying, nor is it classified as a drying process. The moisture content after drying exceeds the standard, the microorganism content in the vegetables does not reach the standard, and the dried vegetables are difficult to store. Common dehydrated vegetable processing technologies comprise a normal-pressure hot air drying technology, freeze drying and microwave drying, and the normal-pressure hot air drying technology is mature for enterprises, but has the problems of large energy consumption, low efficiency and the like. Compared with the normal pressure hot air technology, the vacuum freezing technology has good product quality and increased added value. The freeze-drying production equipment has low efficiency and high energy consumption, and the development of the vacuum freezing technology is hindered. The drying time by adopting the microwave drying technology is shortened, the product quality is higher, however, if the moisture content of the vegetables to be dried is too high, the additional value is increased, and the moisture content is too low, the problem of ignition is easily caused.

Disclosure of Invention

In view of the above, there is a need to provide a microwave drying apparatus that can maintain the original color, nutrition and flavor of vegetables, has low energy consumption, high efficiency, low added value, and can prevent materials from being excessively dried and catching fire, and the microorganisms reach the standard, and the moisture and microorganism content of the vegetables reach the standard.

The microwave drying equipment comprises a pre-humidifying device, a conveyor belt and a microwave drying oven, wherein the pre-humidifying device comprises a box body, a feeding bin, a baffle plate, a steam pipe network and a swinging mechanism, the box body is rectangular, the top and the bottom of the box body are open, an outlet of the feeding bin is connected with an opening at the top of the box body, at least two baffle plates are arranged in the box body from top to bottom, the width of each baffle plate is equal to the width of an inner cavity of the box body, the length of the projection of each baffle plate on the bottom wall of the box body is smaller than the length of the inner cavity of the box body, one end of each baffle plate at the left side of the box body is connected with the left side wall of the box body, the other end of each baffle plate at the left side of the box body is a free end, the other end of each baffle plate at the right side of the box body is, two adjacent baffle plates are arranged on the left side and the right side of the inner cavity of the box body in a staggered mode, the steam pipe network comprises a main steam pipe, branch steam pipes and steam nozzles, the main steam pipe is provided with an inlet and a plurality of outlets, the inlet of the main steam pipe is connected with a steam source, the lower surface of each baffle plate is provided with the branch steam pipes, the number of the outlets of the main steam pipe corresponds to the number of the branch steam pipes, one end of each branch steam pipe is closed, the other end of each branch steam pipe is connected with the outlet of the main steam pipe, the branch steam nozzles are arranged on each branch steam pipe, the inlets of the steam nozzles are communicated with the branch steam pipes, the steam spraying directions of the steam nozzles point to the free ends of the baffle plates, one end of the conveying belt is located right below the opening in the bottom of the box body, the motor is fixed on the outer wall of the box body, one end of the connecting rod is rotatably connected with the output end face of the motor, the connecting point of the connecting rod and the motor deviates from the circle center of the output end face of the motor, the other end of the connecting rod is hinged with the lower surface of one of the baffle plates, each baffle plate is rotatably connected with the linkage rod, and the baffle plates are pivotally connected with the box body.

Preferably, the steam injection direction of the steam nozzle is parallel to the lower surface of the baffle plate.

Preferably, the steam jet direction of the steam nozzle is directed to the falling point of the material on the upper-layer baffle plate to the lower-layer baffle plate.

Preferably, 5 baffle plates are arranged in the box body from top to bottom.

Preferably, the angle between the baffle and the horizontal plane is 30 °.

Preferably, prevent that the material from excessively drying to catch fire and microwave drying equipment that microorganism is up to standard still includes processing apparatus, humidity transducer arranges the box in, processing apparatus is connected with humidity transducer, motor respectively.

Preferably, the microwave oven comprises a plurality of microwave generating sources, the microwave generating sources are fixedly arranged in an inner cavity of the microwave oven, and the microwave generating sources are positioned right above the conveyor belt and uniformly arranged along the length direction of the conveyor belt.

Preferably, air inlet holes are densely distributed on the side walls of the two sides of the microwave drying oven.

Preferably, the microwave drying oven includes the hydrofuge device, the hydrofuge device is responsible for, the hydrofuge branch pipe including the hydrofuge, the hydrofuge is responsible for and includes a hydrofuge export and a plurality of hydrofuge entry, the entry of hydrofuge fan and the hydrofuge exit linkage who is responsible for of hydrofuge, the one end of hydrofuge branch pipe and the inner chamber intercommunication of microwave drying oven, the other end of hydrofuge branch pipe and the hydrofuge entry linkage who is responsible for of a hydrofuge, a plurality of hydrofuge branch pipes are along microwave drying oven length direction equipartitions.

Preferably, the microwave drying oven comprises a closed cooling tower, and an inlet and an outlet of the closed cooling tower are both communicated with an inner cavity of the microwave drying oven.

The utility model discloses in, adopt the drying equipment that pre-humidifying device and microwave oven combine, the pre-humidifying device can effectively carry out earlier stage drying, and microwave oven can effectively carry out later stage drying, and more importantly, the pre-humidifying device can replenish partial moisture for the vegetables before getting into microwave oven, improve the moisture content in the vegetables, it is between the heating temperature interval that provides the broad for microwave drying, the dehydrated vegetable of this drying equipment production, not only moisture and microbial content are up to standard, and can keep original color and luster of vegetables, nutrition and flavor, the energy consumption is low, high efficiency, the added value is low.

Drawings

FIG. 1 is an isometric view of the microwave drying apparatus for preventing over-drying and ignition of materials and for achieving microbial compliance.

Fig. 2 is a sectional view of the microwave drying equipment for preventing the materials from being excessively dried and catching fire and reaching the standards of microorganisms.

Fig. 3 is an enlarged view of a portion of the pre-wetting apparatus.

In the figure: the device comprises a pre-humidifying device 10, a box body 11, a feeding bin 12, a baffle plate 13, a steam pipe network 14, a steam main pipe 141, a steam branch pipe 142, a steam nozzle 143, a swing mechanism 15, a motor 151, a connecting rod 152, a linkage rod 153, a conveyor belt 20, a microwave drying oven 30, a microwave generating source 31, an air inlet hole 32, a dehumidifying device 33, a dehumidifying main pipe 331, a dehumidifying branch pipe 332 and a closed cooling tower 34.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Referring to fig. 1 to 3, an embodiment of the present invention provides a microwave drying apparatus for preventing materials from being excessively dried and catching fire and microorganisms reaching standards, including a pre-humidifying device 10, a conveyor belt 20, and a microwave drying oven 30, the pre-humidifying device 10 includes a box 11, a feeding bin 12, a baffle plate 13, a steam pipe network 14, and a swing mechanism 15, the box 11 is rectangular, the top and bottom of the box 11 are open, an outlet of the feeding bin 12 is connected with the top opening of the box 11, at least two baffle plates 13 are arranged in the box 11 from top to bottom, the width of the baffle plate 13 is equal to the width of an inner cavity of the box 11, the length of a projection of the baffle plate 13 on the bottom wall of the box 11 is smaller than the length of the inner cavity of the box 11, one end of the baffle plate 13 on the left side of the box 11 is connected with the left side wall of the box 11, the other end of, the other end of the baffle plate 13 on the right side of the box body 11 is a free end, the horizontal height of the free end of the baffle plate 13 is lower than that of the end of the baffle plate 13 connected with the box body 11, two adjacent baffle plates 13 are arranged on the left side and the right side of the inner cavity of the box body 11 in a staggered manner, the steam pipe network 14 comprises a main steam pipe 141, branch steam pipes 142 and steam nozzles 143, the main steam pipe 141 is provided with an inlet and a plurality of outlets, the inlet of the main steam pipe 141 is connected with a steam source, a branch steam pipe 142 is arranged on the lower surface of each baffle plate 13, the number of the outlets of the main steam pipe 141 corresponds to the number of the branch steam pipes 142, one end of each branch steam pipe 142 is closed, the other end of each branch steam pipe 142 is connected with the outlet of the main steam pipe 141, a plurality of steam nozzles 143 are arranged, one end of the conveyor belt 20 is located right below the bottom opening of the box body 11, the other end of the conveyor belt 20 horizontally penetrates through the inner cavity of the microwave drying oven 30, the swing mechanism 15 comprises a motor 151, a connecting rod 152 and a linkage rod 153, the motor 151 is fixed on the outer wall of the box body 11, one end of the connecting rod 152 is rotatably connected with the output end face of the motor 151, the connecting point of the connecting rod 152 and the motor 151 deviates from the circle center of the output end face of the motor 151, the other end of the connecting rod 152 is hinged with the lower surface of one of the baffle plates 13, each baffle plate 13 is rotatably connected with the linkage rod 153, and the baffle plates 13 are pivotally connected.

According to different drying stages of vegetables, a combined drying mode is adopted to remove most of free water and colloid combined water in the vegetables, steam drying is adopted in the initial drying stage, the quality of the vegetables can be well ensured, the vegetables are good in color and luster after drying and high in product grade, in the middle and later drying stages, as the mass transfer coefficient between air and the vegetables is reduced, the removal of the residual moisture requires long drying time and consumes more energy, the microwave drying has the advantages that microwave heating is not surface heating but volume heating, as the power of microwaves penetrates to generate different temperature distributions, relatively large temperature gradients and simultaneously generated moisture concentration gradients, the transfer of heat and quality in materials is accelerated, the microwave drying is more suitable for removing the residual moisture, when the moisture content of the vegetables reaches the vicinity of a critical value, the drying rate is sharply improved, more importantly, in the subsequent microwave drying process, the moisture content of the vegetables subjected to pre-drying is too low, and ignition is easy to happen.

The problem of local ignition also occurs due to non-uniform moisture content of the pre-dried vegetables. The utility model discloses in the pre-humidification device 10 that sets up, steam nozzle 143's the directional baffling board 13's of steam jet direction free end, the vegetables on the baffling board 13 receive steam impact along the whereabouts in-process, form with box 11 lateral wall at lower floor baffling board 13 and turn back, strike each other with steam again, promote the all-round contact of vegetables and steam greatly, make vegetables moisture content even unanimous. Steam meets the baffling board 13 that the temperature is lower in box 11, can produce the comdenstion water, the comdenstion water of production can be followed the free end of baffling board 13 and flowed into on the lower floor vegetables, cause the local moisture of vegetables too high, because the steam jet direction of steam jet 143 points to the free end design of baffling board 13, the comdenstion water is at the in-process that drops, meets with high-pressure steam and is hit the bits of broken glass, the dispersion is small drop of water, can avoid the too high problem of the local moisture of vegetables that steam comdenstion water caused. The baffle plates 13 arranged in a staggered mode form a zigzag rotary conveying channel, vegetables are continuously turned over in the conveying process, the humidity of the vegetables can be guaranteed to be uniform, the microwave drying temperature can be improved to the maximum extent, and the phenomenon that the subsequent vegetables catch fire due to overhigh relative temperature at a place with low moisture content due to uneven moisture content after entering the microwave drying oven 30 is avoided. In the case of uniform moisture content, when the drying temperature is low in other heating methods, the inner layer is dried slowly and the drying time is long, and when the drying temperature is high, the moisture content of the surface layer is low, and the problem of ignition is also easily caused.

The utility model discloses in, motor 151 drives the baffling board 13 luffing motion on connecting rod 152 drive upper strata, and baffling board 13 on upper strata drives other baffling board 13 synchronous swings of connecting rod 152 drive, makes vegetables have fixed dwell time in box 11, can effectively keep the moisture content at a relatively invariable through the vegetables after the drying of pre-humidifying device 10, humidification, under baffling board 13's swing effect, vegetables are through rolling by a wide margin, and moisture content is more even.

The utility model discloses in, adopt the drying equipment that pre-humidifying device 10 and microwave drying oven 30 combine, pre-humidifying device 10 can effectively carry out earlier stage drying, and microwave drying oven 30 can effectively carry out later stage drying, more importantly, pre-humidifying device 10 can supply partial moisture for the vegetables before getting into microwave drying oven 30, improve the moisture content in the vegetables, it is between the heating temperature interval that provides the broad for microwave drying, the dehydrated vegetable of this drying equipment production, not only moisture and microbial content are up to standard, and can keep original color and luster of vegetables, nutrition and flavor, the energy consumption is low, high efficiency, the added value is low.

For example, in the original drying device, when microwave drying is adopted alone, the moisture content of the vegetables entering the microwave drying oven 30 is 6%, the process requirement of the microbial content of the vegetables after microwave drying, such as bacteria, is 30w, and the moisture content is lower than 3%, so that the standard requirement can be met, then, when the moisture content of the entering vegetables is 6%, in order to reduce the microbial content below 30w, at this time, because the moisture content in the vegetables is low, the microwave drying can cause the vegetables to be over-dried and catch fire, therefore, only by the idea of the present invention, before entering the microwave drying, the moisture content in the vegetables is increased to 13% by adopting the pre-humidifying device 10, so that after entering the microwave drying oven 30, because the moisture content in the vegetables is increased, the temperature and time of the microwave drying can be properly increased, and the purpose of sterilization is achieved, the microorganism content of the vegetables after microwave drying is not more than 30w, and the water content of the vegetables after microwave drying can be controlled to be lower than 3%. Therefore, the microbial content during microwave sterilization can be met, and the problem of fire caused by over-drying of vegetables can be avoided.

Referring to fig. 1 to 3, further, the steam injection direction of the steam nozzle 143 is parallel to the lower surface of the baffle 13.

Referring to fig. 1 to 3, further, the steam injection direction of the steam nozzle 143 is directed to the falling point of the material on the upper-layer baffle 13 to the lower-layer baffle 13.

Referring to fig. 1 to 3, further, 5 baffles 13 are arranged in the box 11 from top to bottom.

Referring to fig. 1 to 3, further, the angle between the baffle 13 and the horizontal plane is 30 °.

Referring to fig. 1 to 3, further, the microwave drying apparatus for preventing the material from being excessively dried and ignited and enabling the microorganisms to reach the standard further includes a processing device, a humidity sensor, the humidity sensor is disposed in the box body 11, and the processing device is respectively connected with the humidity sensor and the motor 151.

In this embodiment, the processor controls the rotation speed of the motor 151 according to the humidity value signal generated by the humidity sensor and the pre-stored reference humidity value by the processing device, so that the humidity of the vegetables in the box 11 corresponds to the pre-stored reference humidity value, and the moisture content of the vegetables is ensured to be kept in the predetermined range.

Referring to fig. 1 to 3, further, the microwave oven 30 includes a plurality of microwave generating sources 31, the microwave generating sources 31 are fixedly installed in the inner cavity of the microwave oven 30, and the microwave generating sources 31 are located right above the conveyor belt 20 and are uniformly arranged along the length direction of the conveyor belt 20.

Referring to fig. 1 to 3, air inlet holes 32 are further densely distributed on both side walls of the microwave oven 30.

Referring to fig. 1 to 3, further, the microwave drying oven 30 includes a moisture discharging device 33, the moisture discharging device 33 includes a main moisture discharging pipe 331 and a branch moisture discharging pipe 332, the main moisture discharging pipe 331 includes a moisture discharging outlet and a plurality of moisture discharging inlets, an inlet of a moisture discharging fan is connected to the moisture discharging outlet of the main moisture discharging pipe 331, one end of the branch moisture discharging pipe 332 is communicated with an inner cavity of the microwave drying oven 30, the other end of the branch moisture discharging pipe 332 is connected to the moisture discharging inlet of the main moisture discharging pipe 331, and the plurality of branch moisture discharging pipes 332 are uniformly distributed along the length direction of the microwave drying oven 30.

Referring to fig. 1 to 3, further, the microwave drying oven 30 includes a closed cooling tower 34, and an inlet and an outlet of the closed cooling tower 34 are both communicated with an inner cavity of the microwave drying oven 30.

In a specific embodiment, the microwave generating sources 31 near the inlet end of the microwave oven 30 are dense, and the microwave generating sources 31 near the outlet end of the microwave oven 30 are sparse, so that the temperature near the inlet end of the microwave oven 30 in the microwave oven 30 is high, the temperature near the outlet end of the microwave oven 30 in the microwave oven 30 is low, and after the vegetables enter the microwave oven 30, the moisture content is reduced continuously, and the drying temperature is reduced continuously, which is beneficial to reducing the ignition probability after the moisture content of the vegetables is reduced.

The embodiment of the utility model provides a module or unit in the device can merge, divide and delete according to actual need.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

Claims (10)

1. The utility model provides a prevent that material overdry catches fire and microwave drying equipment that microorganism is up to standard which characterized in that: the microwave oven comprises a pre-humidifying device, a conveying belt and a microwave drying oven, wherein the pre-humidifying device comprises a box body, a feeding bin, a baffle plate, a steam pipe network and a swinging mechanism, the box body is rectangular, the top and the bottom of the box body are open, the outlet of the feeding bin is connected with the top opening of the box body, at least two baffle plates are arranged in the box body from top to bottom, the width of each baffle plate is equal to the width of an inner cavity of the box body, the projection length of each baffle plate on the bottom wall of the box body is smaller than the length of the inner cavity of the box body, one end of each baffle plate on the left side of the box body is connected with the left side wall of the box body, the other end of each baffle plate on the left side of the box body is a free end, one end of each baffle plate on the right side of the box body is connected with, the steam pipe network comprises a steam main pipe, steam branch pipes and steam nozzles, wherein the steam main pipe is provided with an inlet and a plurality of outlets, the inlet of the steam main pipe is connected with a steam source, the lower surface of each baffle plate is provided with one steam branch pipe, the number of the outlets of the steam main pipe is corresponding to the number of the steam branch pipes, one end of each steam branch pipe is closed, the other end of each steam branch pipe is connected with the outlet of the steam main pipe, each steam branch pipe is provided with a plurality of steam nozzles, the inlet of each steam nozzle is communicated with the corresponding steam branch pipe, the steam spraying direction of each steam nozzle points to the free end of each baffle plate, one end of a conveying belt is positioned right below an opening at the bottom of a box body, the other end of the conveying belt horizontally penetrates through an inner cavity of the microwave drying oven, the swing mechanism comprises a, one end of the connecting rod is rotatably connected with the end face of the output end of the motor, the connecting point of the connecting rod and the motor deviates from the circle center of the end face of the output end of the motor, the other end of the connecting rod is hinged with the lower surface of one of the baffle plates, each baffle plate is rotatably connected with the linkage rod, and the baffle plates are pivotally connected with the box body.

2. The microwave drying apparatus for preventing the material from being over-dried and ignited and reaching the standard of microorganism according to claim 1, is characterized in that: the steam spraying direction of the steam nozzle is parallel to the lower surface of the baffle plate.

3. The microwave drying apparatus for preventing the material from being over-dried and ignited and reaching the standard of microorganism according to claim 1, is characterized in that: the steam jet direction of the steam jet nozzles is directed to the falling point of the material on the upper layer baffle plate to the lower layer baffle plate.

4. The microwave drying apparatus for preventing the material from being over-dried and ignited and reaching the standard of microorganism according to claim 1, is characterized in that: 5 baffle plates are arranged in the box body from top to bottom.

5. The microwave drying apparatus for preventing the material from being over-dried and ignited and reaching the standard of microorganism according to claim 1, is characterized in that: the included angle between the baffle plate and the horizontal plane is 30 degrees.

6. The microwave drying apparatus for preventing the material from being over-dried and ignited and reaching the standard of microorganism according to claim 1, is characterized in that: prevent that material overdry catches fire and microwave drying equipment that microorganism is up to standard still includes processing apparatus, humidity transducer arranges the box in, processing apparatus is connected with humidity transducer, motor respectively.

7. The microwave drying apparatus for preventing the material from being over-dried and ignited and reaching the standard of microorganism according to claim 1, is characterized in that: the microwave drying oven comprises a plurality of microwave generating sources, the microwave generating sources are fixedly arranged in an inner cavity of the microwave drying oven, and the microwave generating sources are positioned right above the conveyor belt and are uniformly arranged along the length direction of the conveyor belt.

8. The microwave drying apparatus for preventing the material from being over-dried and ignited and reaching the standard of microorganism according to claim 1, is characterized in that: air inlet holes are densely distributed on the side walls of the two sides of the microwave drying oven.

9. The microwave drying apparatus for preventing the material from being over-dried and ignited and reaching the standard of microorganism according to claim 1, is characterized in that: the microwave drying oven comprises a dehumidifying device, the dehumidifying device comprises a dehumidifying main pipe and a dehumidifying branch pipe, the dehumidifying main pipe comprises a dehumidifying outlet and a plurality of dehumidifying inlets, the inlet of a dehumidifying fan is connected with the dehumidifying outlet of the dehumidifying main pipe, one end of the dehumidifying branch pipe is communicated with the inner cavity of the microwave drying oven, the other end of the dehumidifying branch pipe is connected with the dehumidifying inlet of the dehumidifying main pipe, and the plurality of dehumidifying branch pipes are uniformly distributed along the length direction of the microwave drying oven.

10. The microwave drying apparatus for preventing the material from being over-dried and ignited and reaching the standard of microorganism according to claim 1, is characterized in that: the microwave drying oven comprises a closed cooling tower, and an inlet and an outlet of the closed cooling tower are communicated with an inner cavity of the microwave drying oven.

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