Convenient tunnel drying machine for vermicelli

Abstract

The present application discloses a convenient tunnel drying machine for vermicelli, comprising: a feeding section, a drying section, and a discharging section, wherein the feeding section is arranged on one side of the drying section; the discharging section is arranged on the other side of the drying section; a plurality of middle-section ventilation components are arranged on the middle section of the drying rack in the Z direction, and each middle-section ventilation component is arranged in the drying rack at intervals along the Y direction. By arranging a plurality of fans on the plane of the middle section in the Z direction of the drying rack, the air flow rate in the plane inside the drying rack is increased, the temperature in the area is reduced, and a hard shell is avoided from forming on the periphery or surface of vermicelli, and a channel is reserved for the overflow of moisture contained in the central area of ​​the powder cake and the inside of the vermicelli, and by accelerating the air flow, the overflowing wet air leaves the surface of the powder cake in time, the internal moisture migration rate is increased, and the outer wall of the powder cake is avoided from being scorched, the product quality is improved, and the overall moisture content of the powder cake is guaranteed to meet the requirements.

Description

Technical Field

[0001] The present application relates to a tunnel drying machine for instant vermicelli, belonging to the technical field of food drying machinery. Background Art

[0002] All kinds of existing vermicelli products need to go through a drying process. During the drying process, tower dryers are mostly used for vermicelli strips. Although this type of dryer occupies a small area, it has poor dehumidification effect and a long drying time. It can only be dried in batches in the oven, and cannot achieve continuous large-scale production. The production efficiency is low. The degree of dryness of vermicelli dried in the same batch is different, and there are often products with excessive moisture content. If the moisture content is tested one by one, it is time-consuming and labor-intensive; if the material is discharged directly, it will affect the shelf life of the product.

[0003] Existing tunnel drying devices for vermicelli often have the problem that the outer periphery of the powder cake is too dry, while the inner center area of ​​the powder cake is not dry. Such products are difficult to detect accurately and are easily missed. Once sold, they will become corrupt within the shelf life, seriously affecting product quality.

[0004] In the existing vermicelli drying process, in order to avoid local gelatinization of vermicelli and achieve comprehensive drying of the powder cake, low temperature and long time are usually used to achieve comprehensive drying. However, in this kind of drying process, since the wet vermicelli is exposed to low temperature conditions for a long time, the local bacteria content of the vermicelli will exceed the standard, and even the vermicelli itself will be fermented during the drying process, affecting the quality of the dried product. Summary of the invention

[0005] The present application provides a convenient tunnel drying machine for vermicelli, which is used to solve the technical problems in the prior art that the central area of ​​the powder cake is difficult to completely dry after drying, the degree of drying is uneven, the quality of the powder cake is reduced, and the bacterial content exceeds the standard.

[0006] The present application provides a convenient tunnel drying machine for vermicelli, comprising: a feeding section, a drying section, and a discharging section, wherein the feeding section is arranged on one side of the drying section; the discharging section is arranged on the other side of the drying section;

[0007] The feeding section includes: a feeding frame, a first gear set, a first chain section, and a plurality of powder box components. The first gear set is rotatably installed in the first end of the feeding frame; the first end of the first chain section is meshed with the first gear set; the two ends of the powder box component are respectively hinged to the inner wall of the first chain section; the drying section includes: a drying frame, a plurality of hot air generators arranged at intervals, a dehumidification pipeline, a plurality of gear sets, and a plurality of middle section ventilation components; the air outlet end of the hot air generator is arranged on the top surface of the drying frame; the air inlet end of the hot air generator is arranged on the bottom surface of the drying frame; the hot air is discharged on the drying frame The air in the drying rack circulates from top to bottom; the dehumidification pipeline is arranged in the middle section of the drying rack in the Y direction, an exhaust fan is arranged at one end of the dehumidification pipeline, and is connected to the bottom of the drying rack, and the other end of the dehumidification pipeline is emptied; the wet air in the rack is discharged along the dehumidification pipeline; multiple sets of gear sets are symmetrically arranged at both ends of the drying rack, and each gear set is meshed with the first chain segment; the fan box assembly is driven by the first chain segment and passes through the gear sets arranged in the drying rack in sequence, and after reciprocating in the drying rack along the Y direction of the drying rack, it enters the discharge section from the discharge port arranged on the side wall of the bottom of the drying rack;

[0008] A plurality of middle section ventilation components are arranged in the middle section of the drying rack in the Z direction, and each middle section ventilation component is arranged in the drying rack at intervals along the Y direction.

[0009] Preferably, the middle section ventilation assembly comprises: a ventilation bracket and a ventilation fan, the two ends of the ventilation bracket are respectively connected to the inner side wall of the middle section of the drying rack; the ventilation fan is arranged in the middle section of the ventilation bracket.

[0010] Preferably, the adjacently arranged ventilation fans include: a ventilation fan and another ventilation fan, and projections of one ventilation fan on a ventilation bracket of the other ventilation fan are arranged at intervals from each other.

[0011] Preferably, the gear set includes: a second gear set, a third gear set, a fifth gear set, a sixth gear set, and a seventh gear set;

[0012] The second gear set, the third gear set, the fifth gear set, the sixth gear set and the seventh gear set are arranged in pairs at two ends of the drying frame;

[0013] The second gear set is symmetrically arranged at the feed inlet and the discharge outlet of the lower part of the drying frame, and the second gear set arranged at the feed inlet is meshed with the first chain segment;

[0014] The second chain segment is connected to one end of the first chain segment; after the second gear set arranged at the feed inlet is meshed with the second chain segment, the second chain segment is meshed with the third gear set, the fifth gear set, the sixth gear set and the seventh gear set in sequence.

[0015] Preferably, the third gear set is arranged on the top of the drying frame, and the third gear set includes: a first gear and a second gear arranged in pairs at both ends of the drying frame; the second chain segment is meshed with the first gear in the third gear set; and the second chain segment is extended along the drying frame and meshed with the second gear in the third gear set.

[0016] Preferably, the seventh gear set is arranged opposite to the second gear set and between the second gear sets arranged in pairs;

[0017] The sixth gear set is arranged above the outer side of the seventh gear set; the fifth gear set is arranged above the inner side of the sixth gear set; and the third gear set is arranged above the outer side of the fifth gear set.

[0018] Preferably, it comprises: a powder pressing assembly, which is arranged on the top surface of the feeding end of the drying rack and is arranged opposite to each powder box assembly on the top surface of the feeding end of the drying rack.

[0019] Preferably, the powder pressing assembly comprises: a powder pressing frame, a powder pressing chain segment, a powder pressing gear set, and a powder pressing rod.

[0020] The powder pressing machine frame is mounted on the top surface of the feeding end of the drying machine frame;

[0021] The powder pressing gear groups are arranged in pairs at both ends of the powder pressing machine frame;

[0022] The powder pressing gear set at the feeding end is meshed with the third gear set;

[0023] Both ends of the powder pressing chain segment are respectively meshed with the powder pressing gear set;

[0024] The two ends of the powder pressing rod are respectively hinged to the inner side of the powder pressing chain segment.

[0025] Preferably, the vermicelli box assembly comprises: a plurality of vermicelli tubes, a box body, a hinge, and a fixing block, and each vermicelli tube is placed in the box body;

[0026] The fixing blocks are symmetrically arranged on the outer side walls at both ends of the box body;

[0027] The hinge is arranged at the middle of the top surface of the fixed block and is hinged to the first chain segment;

[0028] Preferably, the hot air generator comprises: a heating chamber, an exhaust fan, and a circulating air duct.

[0029] The first end cover of the heating chamber is arranged on the top surface of the drying frame;

[0030] The second end of the heating chamber extends out of the drying frame and is connected to the first end of the circulating air duct;

[0031] The circulating air duct extends along the outer side wall of the drying rack toward the bottom surface of the drying rack to form an extended end;

[0032] The exhaust fan is arranged on the extended end of the circulating air duct;

[0033] The air suction port of the exhaust fan is extended into the drying frame.

[0034] Another aspect of the present application also provides a convenient tunnel drying method for vermicelli, which is carried out in the tunnel drying machine as described above, and comprises the following steps:

[0035] Dry at 50~80℃ for 1~3 hours; the moisture content of the powder cake is 45~55% when entering, and 13~16% when leaving;

[0036] The vermicelli has a diameter of 0.5 mm to 5 cm in the shape of square strips;

[0037] Each powder weighs 10~200g;

[0038] Preferably, each portion of vermicelli weighs 30-70 g;

[0039] Preferably, the vermicelli is sweet potato flour, potato flour or rice flour.

[0040] The beneficial effects of this application include:

[0041] 1) The convenient vermicelli tunnel dryer provided in the present application increases the air flow rate in the plane inside the drying rack and reduces the temperature in the area by arranging multiple fans on the middle plane of the drying rack in the Z direction, thereby avoiding the formation of a hard shell on the periphery or surface of the vermicelli, and reserving a channel for the overflow of moisture contained in the central area of ​​the powder cake and the inside of the vermicelli. By accelerating the air flow, the overflowing wet air leaves the surface of the powder cake in time, increasing the rate of internal moisture migration, avoiding the outer wall of the powder cake from burning, improving product quality, and ensuring that the overall moisture content of the powder cake meets the requirements.

[0042] 2) The convenient vermicelli tunnel drying machine provided in the present application forms multiple heating zones and cooling zones in the drying rack by arranging multiple hot air generators at intervals along the Y direction of the drying rack, so that the powder cake passes through the heating and cooling zones repeatedly, thereby accelerating the speed of moisture migration inside the powder cake and effectively killing bacteria on the surface of the powder cake to prevent the powder cake from fermenting during the drying process.

[0043] 3) The instant vermicelli tunnel dryer provided in the present application is particularly suitable for processing sweet potato flour and potato flour. After drying with the device, the crushing rate and the broken rate of the sweet potato flour and the potato flour are improved. At the same time, it only takes 5 hours of drying to obtain a powder cake with a moisture content of less than 15% in each part. The drying efficiency is high and the powder cake quality is good. After drying with the device, the moisture content of each area of ​​the obtained powder cake is about 15%, the rehydration time is 4 minutes, and the broken rate is 3%. All parameters are far better than those of the control group without setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Schematic diagram of the three-dimensional structure of the convenient vermicelli tunnel drying machine provided in this application; (the X, Y, and Z directions in this application refer to Figure 1 Directions shown in

[0045] Figure 2 A schematic diagram of the three-dimensional structure of the feeding section provided in this application;

[0046] Figure 3 for Figure 1 A local enlarged schematic diagram of point A in the middle;

[0047] Figure 4 A schematic diagram of the three-dimensional structure of the reciprocating drying section provided in this application;

[0048] Figure 5 A schematic diagram of the three-dimensional structure of the feeding end of the drying section provided in this application;

[0049] Figure 6 A schematic diagram of the top view of the drying section provided in this application;

[0050] Figure 7 for Figure 5 A schematic diagram of the local enlarged structure of point B in the middle;

[0051] Legend:

[0052] 10. Feeding section; 11. Feeding rack; 12. First gear set; 121. First chain section; 13. Vermicelli box assembly; 131. Vermicelli tube; 133. Box body; 132. Hinged member; 134. Fixed block; 20. Drying section; 201. Drying rack; 203, second gear set; 204, third gear set; 207, fifth gear set; 208, sixth gear set; 209, seventh gear set; 21, hot air generator; 211, heating chamber; 214, exhaust fan; 213, circulating air duct; 202, powder pressing machine frame; 241, powder pressing chain segment; 243, powder pressing rod; 205, powder pressing gear set; 206, synchronous gear set; 27, ventilation bracket; 271, ventilation fan; 22, dehumidification pipeline; 221, exhaust fan; 23, driving motor; 30, discharging section; 31, eighth gear set. DETAILED DESCRIPTION

[0053] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0054] See also Figure 1 The instant vermicelli tunnel drying machine provided in the present application comprises: a feeding section 10, a drying section 20, and a discharging section 30, wherein the feeding section 10 is arranged on one side of the drying section 20; and the discharging section 30 is arranged on the other side of the drying section 20;

[0055] See also Figure 3 The feeding section 10 includes: a feeding frame 11, a first gear set 12, a first chain segment 121, and a plurality of powder box components 13. The first gear set 12 is rotatably installed in the first end of the feeding frame 11; the first end of the first chain segment 121 is meshed with the first gear set 12; the two ends of the powder box component 13 are respectively hinged to the inner wall of the first chain segment 121; the powder box component 13 and the first gear set 12 are arranged in parallel in the feeding frame 11;

[0056] See also Figures 2~5 The drying section 20 includes: a drying rack 201, a plurality of hot air generators 21 arranged at intervals, a dehumidification pipeline 22, a plurality of gear sets, and a plurality of middle section ventilation components; the air outlet end of the hot air generator 21 is arranged on the top surface of the drying rack 201; the air inlet end of the hot air generator 21 is arranged on the bottom surface of the drying rack 201; the hot air circulates from top to bottom in the drying rack 201; the dehumidification pipeline 22 is arranged in the middle section of the drying rack 201Y, and an exhaust fan 221 is arranged at one end of the dehumidification pipeline 22, and is connected to the drying rack 20 1 is connected at the bottom, and the other end of the dehumidification pipeline 22 is emptied; the humid air in the frame is discharged along the dehumidification pipeline 22; multiple sets of gear sets are symmetrically arranged at both ends of the drying frame 201, and each gear set is meshed with the first chain segment 121; the vermicelli box assembly 13 passes through the gear sets arranged in the drying frame 201 in sequence under the drive of the first chain segment 121, and after reciprocating along the Y direction of the drying frame 201 in the drying frame 201, it enters the discharge section 30 from the discharge port arranged on the side wall of the bottom of the drying frame 201;

[0057] The multiple gear sets include a feed gear set, which is arranged opposite to the first gear set 12, and the feed gear set is respectively connected to the first gear set 12 and a gear set chain arranged on the top surface of the drying frame 201; according to this arrangement, the height of the material can be effectively increased;

[0058] A plurality of middle section ventilation components are arranged in the middle section of the drying rack 201 in the Z direction, and each middle section ventilation component is arranged in the drying rack 201 at intervals from each other along the Y direction.

[0059] The hot air generator 21 can be any common heat source such as a heat pump or a steam heat exchanger.

[0060] By setting the middle section ventilation assembly, the hot air flowability in the area below the Y-direction extension plane of the middle section of the drying rack 201 in the Z direction can be enhanced. The hot air in the drying rack 201 first acts on the air inlet of each hot air generator 21, and the heat is mainly concentrated in the upper part of the drying rack 201. The above gear set structure can first lift the wet powder to the upper layer with higher temperature, and quickly reduce the moisture content of the powder, thereby avoiding the problem of excessive bacteria content caused by long-term low-temperature drying.

[0061] When the vermicelli is on the upper layer of the drying rack 201, most of the moisture has been evaporated and the surface wetness has also been significantly reduced; the hot air temperature in the middle of the drying rack 201 has dropped significantly. Since the periphery of the vermicelli that has run to this point has been dried, the water contained in the vermicelli and the dry matter of the vermicelli have interacted closely, the powder has shrunk significantly, and the internal structure of the powder after shrinkage is denser. The channel for the moisture inside the powder cake to diffuse outward is further reduced, and continuing to increase the overall temperature in the box is difficult to ensure that the moisture inside the powder cake is fully evaporated.

[0062] When the vermicelli runs to the middle of the drying rack 201, the main drying objects are the moisture on the vermicelli surface and the moisture inside the vermicelli in the central area of ​​the powder cake; at this time, the evaporation rate of the moisture inside the powder cake is controlled by the rate at which the moisture moves in the material. By adding multiple ventilation fans 271 in the middle of the drying rack 201, the temperature of the area below the middle section of the drying rack 201 can be reduced, and the air flow rate can be increased, thereby increasing the rate at which the moisture inside the vermicelli moves outward, improving the internal drying efficiency, and at the same time, the humid air moved to the outer wall of the powder cake is taken away in time, thereby achieving complete drying of the inner central area of ​​the powder cake under the same drying time.

[0063] The dryer with this structure can realize online batch drying of powder cakes. After drying, the rehydration time and breaking rate of the powder cakes are good. The moisture content in the center and the periphery of the powder cakes is the same, both below 15%, meeting the factory requirements. At the same time, the color of the vermicelli does not change, avoiding the yellowing or burning of the powder cake surface, improving product quality.

[0064] See also Figures 5 and 6 Preferably, the middle section ventilation assembly includes: a ventilation bracket 27 and a ventilation fan 271, the two ends of the ventilation bracket 27 are respectively connected to the inner side wall of the middle section of the drying rack 201; the ventilation fan 271 is arranged in the middle section of the ventilation bracket 27.

[0065] Preferably, the adjacently arranged ventilation fans 271 include: a ventilation fan 271 and another ventilation fan 271 , and the projections of one ventilation fan 271 on the ventilation bracket 27 of the other ventilation fan 271 are arranged at intervals from each other.

[0066] According to this arrangement, a staggered air duct can be formed below the middle section of the drying rack 201. By forming airflows of uniform strength in different areas, the degree of dryness of the middle portion of the final powder cake can be effectively improved, and the problem of excessive moisture content in the middle portion can be completely avoided. At the same time, the powder cake obtained after drying using the device of this structure has a lower breaking rate, which can avoid the problem of a high breaking rate caused by drying for too long a time, thereby improving the product quality of the obtained powder cake.

[0067] Preferably, the gear set includes: a second chain segment, a second gear set 203, a third gear set 204, a fifth gear set 207, a sixth gear set 208, and a seventh gear set 209; the second gear set 203, the third gear set 204, the fifth gear set 207, the sixth gear set 208, and the seventh gear set 209 are arranged in pairs at both ends of the drying frame 201; the second gear set 203 is symmetrically arranged at the feed port and the discharge port at the lower part of the drying frame 201, and the second gear set 203 arranged at the feed port is meshed with the first chain segment 121; the second chain segment is connected to one end of the first chain segment 121; after the second gear set 203 arranged at the feed port is meshed with the second chain segment, the second chain segment is meshed with the third gear set 204, the fifth gear set 207, the sixth gear set 208, and the seventh gear set 209 in sequence.

[0068] Preferably, the third gear set 204 is arranged on the top of the drying frame 201, and the third gear set 204 includes: a first gear and a second gear arranged in pairs at both ends of the drying frame 201; the second chain segment is meshed with the first gear in the third gear set 204; and the second chain segment is extended along the drying frame 201 and meshed with the second gear in the third gear set 204.

[0069] Preferably, the seventh gear set 209 is arranged opposite to the second gear sets 203 and between the second gear sets 203 arranged in pairs.

[0070] Preferably, the sixth gear set 208 is disposed above and outside the seventh gear set 209 ; the fifth gear set 207 is disposed above and inside the sixth gear set 208 ; and the third gear set 204 is disposed above and outside the fifth gear set 207 .

[0071] The rotation installation method of each gear set is set according to the existing installation method and will not be repeated here.

[0072] Preferably, the first end of the second chain segment is connected to the second end of the first chain segment 121; the second chain segment is respectively meshed with the second gear set 203 and the third gear set 204, the fifth gear set 207, the sixth gear set 208, and the seventh gear set 209 arranged in pairs.

[0073] When in use, the powder puff is contained in the powder box assembly 13, and the powder box assembly 13 is hinged to the inner side of the first chain segment 121, and reciprocates at both ends of the drying frame 201 with the first chain segment 121 and the second chain segment, so that the powder puff can reciprocate multiple times in the Y direction of the drying frame 201, and pass through the circulating hot air zone formed by the hot air generator 21 in the drying frame 201 in sequence for multiple times. The ambient temperature of the area outside the air outlet of the hot air generator 21 is lower than the temperature of the area directly facing the air outlet of the hot air generator 21. Through the reciprocating motion, the powder puff can repeatedly enter and exit different ambient temperature areas, thereby accelerating the speed of the water inside the powder puff to move outward, and avoiding the damage to the strength and toughness of the powder puff on the periphery of the powder puff due to continuous heating, thereby reducing the powder puff breakage rate and improving product quality.

[0074] Preferably, it includes: a powder pressing component, which is arranged on the top surface of the feeding end of the drying rack 201 and is arranged directly opposite to each powder box component 13 on the top surface of the feeding end of the drying rack 201.

[0075] According to this setting, the powder cake that is too fluffy after feeding can be squeezed, so as to prevent the powder from falling off from the powder box component 13 and causing waste of raw materials.

[0076] See also Figure 5 and 7 Preferably, it includes: a powder pressing frame, a powder pressing chain segment 241, a powder pressing gear set 205, and a powder pressing rod 243. The powder pressing frame is mounted on the top surface of the feeding end of the drying frame 201; the powder pressing gear sets 205 are arranged in pairs at both ends of the powder pressing frame; the powder pressing gear set 205 at the feeding end is meshed with the third gear set 204 to achieve synchronous rotation; the two ends of the powder pressing chain segment 241 are respectively meshed with the powder pressing gear set 205; the two ends of the powder pressing rod 243 are respectively hinged to the inner side of the powder pressing chain segment 241.

[0077] In a specific embodiment, the powder pressing gear set 205 and the third gear set 204 are meshed to realize synchronous rotation, so as to ensure that when a new powder cake enters the drying frame 201, the powder pressing rod 243 moves along the lower section of the powder pressing chain section 241 to the far end of the powder pressing gear set 205. In this process, the powder cake is dried at a high temperature in the cylinder and basically takes shape, and then the powder pressing rod 243 moves along the upper section of the powder pressing chain section 241 to the feeding end, and the above process is repeated again.

[0078] Preferably, the powder pressing rod 243 includes: a rod body, a plurality of small rods, and a plurality of discs, wherein the first ends of the small rods are arranged on the bottom surface of the rod body at intervals; a disc is arranged on the second end of the small rod, and the disc is directly smaller than the inner diameter of the powder cone 131; and the two ends of the rod body are respectively hinged to the inner wall of the powder pressing chain segment 241.

[0079] Preferably, the synchronous gear group 206 includes synchronous gears arranged in pairs at the powder pressing gear group 205 and one end of the third gear group 204, and the synchronous gears are meshed; the first synchronous gear is arranged on the top surface of the second synchronous gear, and the first synchronous gear is connected to the gear at one end of the powder pressing gear group 205; the second synchronous gear is connected to the gear at one end of the third gear group 204.

[0080] See also Figure 3 The vermicelli box assembly 13 includes: a plurality of vermicelli tubes 131, a box body 133, a hinge 132, and a fixing block 134. Each vermicelli tube 131 is placed in the box body 133; the fixing blocks 134 are symmetrically arranged on the outer side walls of both ends of the box body 133; the hinge 132 is arranged in the middle of the top surface of the fixing block 134, and is hinged to the first chain segment 121;

[0081] The first chain segment 121 and the second chain segment are hinged to form a chain, which is artificially divided into segments for the convenience of description.

[0082] By setting the fixed block 134, it is convenient to counterweight the box body 133 to prevent it from reversing during operation. At the same time, by setting the hinge 132 in the middle of the fixed block 134, it is convenient to make the box body 133 shake according to the force conditions during operation to prevent the box body 133 from completely reversing and causing the powder to fall out.

[0083] Preferably, a plurality of vents are provided on the surface of the powder tube 131; and a plurality of vents are provided on the surface of the box body 133. This arrangement can improve the exhaust effect of the powder in the tube, reduce the accumulation of moisture in the tube, and improve the drying efficiency.

[0084] See also Figure 4 Preferably, the hot air generator 21 includes: a heating chamber 211, an exhaust fan 221, and a circulating air duct. The first end of the heating chamber 211 is covered on the top surface of the drying rack 201; the second end of the heating chamber 211 extends outward from the drying rack 201 and is connected to the first end of the circulating air duct; the circulating air duct extends along the outer wall of the drying rack 201 to the bottom surface of the drying rack 201 to form an extended end; the exhaust fan 221 is arranged on the extended end of the circulating air duct; the exhaust port of the exhaust fan 221 extends into the drying rack 201. According to this arrangement, the hot air can be evenly circulated from the top surface to the bottom surface of the drying rack 201.

[0085] The hot air generator 21 adopting this structure can form multiple heating zones and cooling zones at intervals in the Y direction of the drying rack 201. The powder cake repeatedly passes through the heating zone and the cooling zone, which can not only accelerate the outward migration speed of the moisture in the central area, but also achieve comprehensive sterilization of the powder cake, reduce bacterial growth, and prevent the powder cake from running to the low-temperature area at the bottom of the drying rack 201, where bacteria ferment in the powder cake and damage the product quality.

[0086] Preferably, the dehumidification pipeline 22 includes: an exhaust fan 221 and a pipeline, wherein the air inlet end of the exhaust fan 221 extends into the drying rack 201 and is arranged on the bottom surface of the drying rack 201; the first end of the pipeline is connected to the air outlet of the exhaust fan 221; the second end of the pipeline extends along the Z direction of the drying rack 201 toward the top surface of the drying rack 201 to form an emptying end.

[0087] According to this arrangement, the structure is simple and the suction force is strong. It can reduce the moisture content of the air below the drying rack 201, avoid bacterial growth, and facilitate the movement of moisture inside the powder to the air with lower moisture content, thereby improving the drying efficiency and achieving the drying of the moisture inside the powder.

[0088] Preferably, a driving motor 23 is included, which is disposed at the lower part of the drying frame 201 and is drivingly connected to one end of the second chain segment.

[0089] Preferably, the discharging section 30 comprises: a discharging frame, an eighth gear set 31, one end of the discharging frame is connected to the lower part of the drying frame 201, and the other end of the discharging frame is rotatably provided with the eighth gear set 31, and the eighth gear set 31 is connected to the seventh gear set 209 through a second chain. According to this arrangement, the dried powder cake can directly enter the discharging section 30, and after air cooling in the discharging section 30, it can be automatically discharged after rolling at the eighth gear set 31 as the powder box assembly 13 moves.

[0090] Another aspect of the present application includes a convenient vermicelli tunnel drying method, which is carried out in a tunnel dryer as described above, and includes the following steps: drying at 50-80°C for 1-3 hours; the moisture content of the powder entering is 45-55%, and the moisture content of the powder when discharged is 13-16%; the vermicelli is a square strip with a diameter of 0.5mm-5cm; the weight of each powder is 10-200g, preferably, the weight of each vermicelli is 30-70g; preferably, the vermicelli is sweet potato flour, potato flour or rice flour.

[0091] The device provided by the present application is particularly suitable for processing materials such as sweet potato flour, potato flour or rice flour. Example

[0092] Test objects: A: The sweet potato powder cake was obtained by drying in the above-mentioned dryer; B: The sweet potato powder cake was obtained by drying in a tunnel dryer without a mid-section ventilation component; the other process parameters of Group A and Group B were exactly the same.

[0093] Bar breakage rate test:

[0094] Test method: Take the dried sweet potato powder sample and boil it in boiling water for 10 minutes, pick out the broken powder, weigh the broken powder, and calculate the percentage of the weight of the broken powder to the total mass of the sweet potato powder as the broken powder rate.

[0095] Test results: The broken rate of samples in group A was 3%; the broken rate of samples in group B was 15%.

[0096] From the above, it can be seen that the tunnel drying machine provided in this application can effectively reduce the breakage rate of sweet potato flour after drying and improve product quality.

[0097] Rehydration time test:

[0098] Test method: Soak the sample in 60℃ water and observe until the sample disperses and the vermicelli becomes soft. The time is taken as the rehydration time.

[0099] Test results: The rehydration time of group A samples was 4 minutes; the rehydration time of group B samples was 6 minutes.

[0100] After the sweet potato flour is dried using the device provided by the present application, the powder cake has a short rehydration time and a low breakage rate. Compared with the powder cake without a middle-section ventilation component, the drying effect is improved, the product quality is good, and the overall moisture content meets the standard.

[0101] Measurement of moisture content of powder:

[0102] The samples in groups A and B were measured according to the existing measurement method. The moisture content in each area of ​​group A samples was less than 15%. The moisture content in the central area of ​​group B was 30%, and the moisture content in the outer vermicelli was 10%.

[0103] From the above, it can be seen that by using the device provided in this application, the moisture content of each area of ​​the powder cake can be evenly reduced to the required level; if the middle ventilation component is not provided, the interior of the powder cake cannot be dried, and the moisture content of the outer powder is too low, which seriously affects the product quality.

[0104] The "one embodiment", "another embodiment", "embodiment", "preferred embodiment" and the like mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when a specific feature, structure or characteristic is described in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0105] Although the present application is described herein with reference to a plurality of illustrative embodiments of the present application, it should be understood that those skilled in the art may devise many other modifications and implementations that fall within the scope and spirit of the principles disclosed herein. More specifically, within the scope of the present disclosure and claims, a variety of variations and improvements may be made to the components and / or layout of the subject combination layout. In addition to the variations and improvements made to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. A convenient tunnel drying machine for vermicelli, characterized in that: include: A feeding section (10), a drying section (20), and a discharging section (30), wherein the feeding section (10) is arranged on one side of the drying section (20); The discharging section (30) is arranged on the other side of the drying section (20); The feeding section (10) comprises: a feeding frame (11), a first gear group (12), a first chain section (121), and a plurality of vermicelli box components (13); the first gear group (12) is rotatably mounted in the first end of the feeding frame (11); the first end of the first chain section (121) is meshed with the first gear group (12); the two ends of the vermicelli box component (13) are respectively hinged to the inner wall of the first chain section (121); the drying section (20) comprises: a drying frame (201), a plurality of hot air generators (21) arranged at intervals, a dehumidification pipeline (22), a plurality of gear groups, and a plurality of middle section ventilation components; the air outlet end of the hot air generator (21) is arranged on the top surface of the drying frame (201); The air inlet end of the hot air generator (21) is arranged on the bottom surface of the drying rack (201); the hot air circulates from top to bottom in the drying rack (201); The dehumidification pipeline (22) is arranged at the middle section of the drying rack (201) in the Y direction; an exhaust fan (221) is arranged at one end of the dehumidification pipeline (22) and is connected to the bottom of the drying rack (201); the other end of the dehumidification pipeline (22) is emptied; the humid air in the rack is discharged outside along the dehumidification pipeline (22); A plurality of gear sets are symmetrically arranged at two ends of the drying frame (201), and each gear set is meshed with the first chain segment (121); The vermicelli box assembly (13) is driven by the first chain segment (121) to sequentially pass through the gear sets arranged in the drying rack (201), and after reciprocating in the drying rack (201) along the Y direction of the drying rack (201), enters the discharge section (30) from the discharge port arranged on a side wall of the bottom of the drying rack (201); A plurality of middle section ventilation components are arranged in the middle section of the drying rack (201) in the Z direction, and the middle section ventilation components are arranged in the drying rack (201) at intervals along the Y direction; The middle section ventilation assembly comprises: a ventilation bracket (27) and a ventilation fan (271); two ends of the ventilation bracket (27) are respectively connected to the inner side wall of the middle section of the drying rack (201); the ventilation fan (271) is arranged in the middle section of the ventilation bracket (27). The adjacently arranged ventilation fans (271) include: a ventilation fan (271) and another ventilation fan (271), wherein projections of the ventilation fan (271) on the ventilation bracket (27) of the other ventilation fan (271) are arranged at intervals from each other; The gear set comprises: a second gear set (203), a third gear set (204), a fifth gear set (207), a sixth gear set (208), and a seventh gear set (209); The second gear set (203), the third gear set (204), the fifth gear set (207), the sixth gear set (208), and the seventh gear set (209) are arranged in pairs at two ends of the drying frame (201); The second gear set (203) is symmetrically arranged at the feed inlet and the discharge outlet of the lower part of the drying frame (201), and the second gear set (203) arranged at the feed inlet is meshed with the first chain segment (121); The second chain segment is connected to one end of the first chain segment (121); after the second gear set (203) disposed at the feed inlet is meshed with the second chain segment, the second chain segment is meshed with the third gear set (204), the fifth gear set (207), the sixth gear set (208), and the seventh gear set (209) in sequence.

2. The instant vermicelli tunnel drying machine according to claim 1, characterized in that: The third gear set (204) is arranged on the top of the drying rack (201), and the third gear set (204) comprises: A first gear and a second gear arranged in pairs at two ends of a drying frame (201); The second chain segment is meshed with the first gear in the third gear set (204); After extending along the drying frame (201), the second chain segment meshes with the second gear in the third gear set (204).

3. The instant vermicelli tunnel drying machine according to claim 1, characterized in that: The seventh gear set (209) is arranged opposite to the second gear set (203) and between the second gear sets (203) arranged in pairs; The sixth gear set (208) is arranged at an outer oblique position above the seventh gear set (209); the fifth gear set (207) is arranged at an inner oblique position above the sixth gear set (208); and the third gear set (204) is arranged at an outer oblique position above the fifth gear set (207).

4. The instant vermicelli tunnel drying machine according to claim 1, characterized in that: include: A powder pressing component is arranged on the top surface of the feed end of the drying frame (201) and is arranged directly opposite to each powder box component (13) on the top surface of the feed end of the drying frame (201).

5. The instant vermicelli tunnel drying machine according to claim 4, characterized in that: The powder pressing assembly comprises: a powder pressing machine frame, a powder pressing chain segment (241), a powder pressing gear set (205), and a powder pressing rod (243). The powder pressing machine frame is mounted on the top surface of the feeding end of the drying machine frame (201); The powder pressing gear sets (205) are arranged in pairs at two ends of the powder pressing machine frame; The powder pressing gear set (205) at the feeding end is meshed with the third gear set (204); Both ends of the powder pressing chain segment (241) are respectively meshed with the powder pressing gear set (205); Both ends of the powder pressing rod (243) are respectively hinged to the inner side of the powder pressing chain segment (241).

6. The instant vermicelli tunnel drying machine according to claim 1, characterized in that: The vermicelli box assembly (13) comprises: a plurality of vermicelli tubes (131), a box body (133), a hinge (132), and a fixing block (134), wherein each vermicelli tube (131) is placed in the box body (133); The fixing blocks (134) are symmetrically arranged on the outer side walls at both ends of the box body (133); The hinge (132) is arranged at the middle of the top surface of the fixed block (134) and is hinged to the first chain segment (121).

7. The instant vermicelli tunnel drying machine according to claim 1, characterized in that: The hot air generator (21) comprises: a heating chamber (211), an exhaust fan (221), and a circulating air duct. The first end cover of the heating chamber (211) is arranged on the top surface of the drying frame (201); The second end of the heating chamber (211) extends outside the drying rack (201) and is connected to the first end of the circulating air duct; The circulating air duct extends along the outer side wall of the drying rack (201) toward the bottom surface of the drying rack (201) to form an extended end; The exhaust fan (221) is arranged on the extended end of the circulating air duct; The air suction port of the exhaust fan (221) is arranged to extend into the drying frame (201).

8. A convenient vermicelli tunnel drying method, characterized in that: Drying is carried out in a tunnel dryer according to any one of claims 1 to 7, comprising the following steps: Dry at 50~80℃ for 1~3 hours; the moisture content of the powder cake entering is 45~55%, and the moisture content of the powder cake leaving is 13~16%.

9. The instant vermicelli tunnel drying method according to claim 8, characterized in that: The vermicelli is in the shape of square strips with a diameter of 0.5 mm to 5 cm.

10. The instant vermicelli tunnel drying method according to claim 8, characterized in that: The vermicelli is sweet potato flour, potato flour or rice flour.

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