A flour drying device

Abstract

The present invention relates to a powder drying device, comprising a frame equipped with a conveyor chain, a circulating fan, a radiator, a positive pressure bin, a negative pressure bin, and a return air duct. The circulating fan, radiator, positive pressure bin, and negative pressure bin are all located above the conveyor chain. The air outlet and air inlet of the circulating fan are respectively connected to the upper portion of the positive pressure bin and the negative pressure bin, and the radiator is located between the air outlet of the circulating fan and the positive pressure bin. The return air duct is located below the conveyor chain, and the bottoms of the positive pressure bin and the negative pressure bin are connected by the return air duct. The airflow blown out by the circulating fan passes through the radiator to form hot air. After drying the upper surface of the powder cake in the positive pressure zone, the hot air passes downward through the conveyor chain into the return air duct. From the return air duct, it dries the lower surface of the powder cake while passing upward through the conveyor chain, and then flows back to the air inlet of the circulating fan, forming a circulating hot air flow. The powder cake undergoes drying on both the upper and lower surfaces, significantly improving drying efficiency and minimizing the difference in drying effect between the upper and lower surfaces.

Description

Technical Field

[0001] The invention relates to the technical field of food processing, in particular to a noodle drying device. Background Art

[0002] There is a very important drying process in the production of cake-shaped rice noodles, vermicelli, and noodles. The rice noodles or noodles are cut into strips and put into the powder box, or the rice noodles and noodles are squeezed into strips and put into the powder box, and then dried together with the powder box.

[0003] The dryer in the prior art usually includes a frame, a conveyor chain and a hot air blower. The hot air blower is arranged above the middle section of the frame, and the conveyor chain is arranged on the frame. The conveyor chain drives multiple powder boxes to be input in sequence from one end of the frame, and the powder boxes are transported to the hot air blower for drying. Then, the conveyor chain drives the powder boxes to be output from the other end of the frame.

[0004] It has the following technical problems:

[0005] The drying efficiency is low and the drying time is long. It is usually necessary to extend the drying time of the powder cake in the dryer. The drying time is more than 130 minutes. The drying temperature is low, and the drying effect of the upper and lower surfaces of the powder cake is quite different. At the same time, in order to enhance the drying effect, the structure usually has multi-layer dryers and vertical hanging dryers. The structure is relatively complex, the dryer is bulky, and occupies a large area. Summary of the Invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a powder drying device with a simple structure, high drying efficiency, and little difference in drying effect between the upper and lower surfaces of the powder cake.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A flour drying device comprises a frame, the frame is provided with a conveyor chain, the frame is provided with a circulating fan, a radiator, a positive pressure bin, a negative pressure bin and a return air duct;

[0009] The circulating fan, radiator, positive pressure bin and negative pressure bin are all installed above the conveyor chain;

[0010] The air outlet and air inlet of the circulation fan are connected to the upper part of the positive pressure chamber and the negative pressure chamber respectively, and the radiator is arranged between the air outlet of the circulation fan and the positive pressure chamber;

[0011] The return air duct is located below the conveyor chain, and the bottoms of the positive pressure bin and the negative pressure bin are connected through the return air duct.

[0012] Furthermore, the frame is provided with a moisture exhaust fan, which is connected to the negative pressure chamber, and the negative pressure chamber is provided with an air inlet with built-in filter cotton.

[0013] Furthermore, at least two drying bin units are provided on the frame, each drying bin unit includes a circulating fan, a radiator, a positive pressure bin, a negative pressure bin and a return air duct, the dehumidification fan is connected to a dehumidification pipe, the dehumidification pipe is respectively connected to the negative pressure bins of at least two drying bin units, and an air volume regulating valve is provided at the place where the dehumidification pipe is connected to the negative pressure bin.

[0014] Furthermore, the positive pressure bin is connected to an insulation door, and an annular insulation board is provided at the inward narrowing part of the insulation door frame. An annular groove is provided on the positive pressure bin, and an annular sealing strip is provided in the annular groove. The annular sealing strip abuts against the annular insulation board to form a seal.

[0015] Furthermore, a crossbeam is fixed to the top of the frame, with both ends of the crossbeam protruding from both sides of the frame. An upper platform is provided on the crossbeam, the circulating fan and the radiator are provided in the middle of the upper platform, and the dehumidification fan is provided on the side of the upper platform.

[0016] Furthermore, the frame is provided with a first slide rail extending along the frame direction, the first slide rail is slidably connected to a sprocket that cooperates with the conveyor chain for transmission, and a driving device is provided on one side of the sprocket for driving the sprocket to slide along the first slide rail.

[0017] Furthermore, an adjusting screw is connected to one side of the sprocket, a spring and a nut are sequentially sleeved on the adjusting screw, and the driving device is in contact with the spring.

[0018] Furthermore, the frame is provided with a second slide rail extending along the frame direction, the second slide rail is slidably connected to the tensioning frame, the first slide rail is opened on the tensioning frame, the tensioning frame is provided with a baffle, the baffle abuts against the spring, and the driving device abuts against the tensioning frame.

[0019] Furthermore, the driving device includes a motor, a coupling, a push rod and a sleeve; the motor is fixed to the frame and connected to one end of the push rod through the coupling, the other end of the push rod is threadedly connected to the inner cavity of the sleeve, and a tail slot is provided on the side of the tensioning frame facing the sleeve, and a semicircular head is provided at one end of the sleeve, and the semicircular head abuts against the tail slot.

[0020] Furthermore, a limiting device is provided on both sides of the tensioning frame, and the limiting device is fixed to the frame and arranged corresponding to the tensioning frame.

[0021] In general, the present invention has the following advantages:

[0022] During operation, the conveyor chain transports the powder cakes to the drying station. Air from the circulating fan outlet passes through a radiator and is heated. After drying the upper surface of the powder cakes in the positive pressure zone, the hot air then flows downward through the conveyor chain into the return air duct. Because the negative pressure chamber is connected to both the return air duct and the circulating fan inlet, the pressure inside the negative pressure chamber is lower than that in the return air duct. This pressure difference draws the hot air from the return air duct into the negative pressure chamber. As the hot air travels upward through the conveyor chain, it dries the lower surface of the powder cakes passing through this zone. After passing through the negative pressure zone, the hot air returns to the circulating fan inlet and is blown out again through the circulating fan outlet, creating a recirculated hot air flow. By utilizing this return flow of hot air for secondary drying of the powder cakes during transport, each powder cake undergoes drying on both its upper and lower surfaces. This significantly improves drying efficiency, shortens drying time, minimizes the difference in drying effect between the upper and lower surfaces, and reduces the size and footprint of the powder drying equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the planar structure of the present invention.

[0024] Figure 2 This is a schematic diagram from another perspective of the present invention.

[0025] Figure 3 It is a structural schematic diagram of the thermal insulation door of the present invention.

[0026] Figure 4 It is a schematic structural diagram of the tensioning device of the present invention after tensioning.

[0027] Figure 5 It is a structural schematic diagram of the tensioning device of the present invention before tensioning.

[0028] Figure 6 for Figure 5 AA enlarged schematic diagram.

[0029] In the picture:

[0030] 11-frame, 12-powder box, 13-crossbeam, 14-cleaning port;

[0031] 21-circulation fan, 22-dehumidification fan, 221-air volume control valve, 23-radiator, 24-positive pressure chamber, 25-negative pressure chamber, 251-air inlet, 252-filter cotton, 26-return air duct, 27-perforated partition;

[0032] 31-insulated door, 32-annular heat insulation board, 33-annular slot, 34-annular sealing strip;

[0033] 41-tensioning frame, 411-tail slot, 421-first slide rail, 422-second slide rail, 423-micro switch, 43-spring, 44-adjusting screw, 45-sleeve, 46-push rod, 47-bearing seat, 48-coupling, 49-motor;

[0034] 51- conveyor chain, 52- sprocket, 53- outer spherical ball bearing with slider seat. DETAILED DESCRIPTION

[0035] This invention has developed a rapid noodle drying technology that replaces the traditional complex multi-layer drying or vertical hanging dryer structures with a single-layer dryer with one outgoing and one return layer. Drying temperatures can reach over 120°C, with a maximum of 150°C, and complete drying in just 25 to 35 minutes. This significantly shortens drying time by nearly four times and significantly reduces the dryer's size, requiring less space. Another important advantage is significantly improved product quality. The high-temperature drying process significantly increases the product's gelatinization degree, greatly reduces soupiness, and improves the noodle product's toughness and taste.

[0036] The present invention will be described in further detail below.

[0037] like Figure 1 、 Figure 2 As shown, a powder drying device includes a frame 11, the frame 11 is provided with a conveyor chain 51 for conveying powder cakes, and the frame 11 is provided with a plurality of drying bin units. In this embodiment, the number of drying bin units is two, and the two drying bin units are arranged in sequence along the extension direction of the frame 11.

[0038] Each drying chamber unit is equipped with a circulating fan 21, a radiator 23, a positive pressure chamber 24, a perforated partition 27, a negative pressure chamber 25 and a return air duct 26;

[0039] The circulating fan 21, the radiator 23, the positive pressure chamber 24 and the negative pressure chamber 25 are all arranged above the conveyor chain 51;

[0040] The air outlet and air inlet of the circulation fan 21 are respectively connected to the upper part of the positive pressure chamber 24 and the negative pressure chamber 25, and the radiator 23 is provided between the air outlet of the circulation fan 21 and the positive pressure chamber 24;

[0041] The return air duct 26 is located below the conveyor chain 51 , and the bottoms of the positive pressure bin 24 and the negative pressure bin 25 are connected through the return air duct 26 .

[0042] During operation, the pressed powder is weighed and placed into the powder box 12. The conveyor chain 51 transports the powder box 12 containing the pressed powder to the drying station. The airflow from the outlet of the circulating fan 21 passes through the radiator 23 to form hot air. A perforated partition 27 is located between the radiator 23 and the conveyor chain 51, allowing the passing hot air to be evenly blown onto the pressed powder below. After the hot air passes through the perforated partition 27 in the positive pressure zone to dry the upper surface of the pressed powder, it passes downward through the conveyor chain 51 and enters the return air duct 26. Because the negative pressure bin 25 is connected to the return air duct 26 and the air inlet of the circulating fan 21, respectively, the pressure in the negative pressure bin 25 is lower than that in the return air duct 26. Due to the pressure difference, the hot air from the return air duct 26 is drawn into the negative pressure bin 25. As the hot air passes upward from the return air duct 26 through the conveyor chain 51, it dries the lower surface of the pressed powder passing through this area. After passing through the negative pressure zone, the hot air flows back to the inlet of the circulating fan 21 and is blown out again from the outlet of the circulating fan 21, forming a circulating hot air flow. Because the hot air's return flow is used to secondary dry the pressed powder during transport, each pressed powder undergoes air drying on both its upper and lower surfaces. This significantly improves drying efficiency and greatly shortens drying time. The difference in drying effect between the upper and lower surfaces of the pressed powder is minimal. The single-layer dryer reduces the size of the powder drying device, and compared to multi-layer drying or vertical hanging systems, the present invention has a simpler structure.

[0043] In this embodiment, holes are provided at the bottom of the powder box 12 so that more air can pass through the holes of the powder box 12 and enter and exit the return air duct 26, thereby enhancing the powder drying effect.

[0044] The humid air in the negative pressure bin 25 needs to be discharged from the machine body to avoid affecting the drying effect of the flour. Therefore, the frame 11 is provided with a dehumidification fan 22, and the dehumidification fan 22 is connected to the negative pressure bin 25. Since one dehumidification fan 22 simultaneously discharges the humid air in multiple drying bin units, if only exhaust is performed without intake, the vacuum degree in the drying bin unit will increase, and air will enter the drying bin unit from both ends of the machine. The air flow in the drying bin unit will become turbulent, and the vacuum degree will increase in the middle. The method of using hot air as the drying medium will cause a sharp drop in the drying effect due to the lack of air circulation. Therefore, an air inlet 251 is provided on the door of the negative pressure bin 25 to replenish air for the drying bin unit, so that the air flow in the drying bin unit is more orderly and the drying effect is improved. The air inlet 251 is equipped with a filter cotton 252 to filter dust and impurities in the air to prevent the product from being contaminated.

[0045] Specifically, the dehumidification fan 22 is connected to a dehumidification pipe, which is respectively connected to the negative pressure bins 25 of the two drying bin units. Since the distances between the air intakes of the negative pressure bins 25 connected to the dehumidification pipes and the dehumidification fan 22 are different, in order to better control the dehumidification volume of each drying bin unit, an air volume regulating valve 221 is installed in front of the dehumidification outlet. The opening of the air volume regulating valve 221 can be controlled according to the actual required dehumidification volume, thereby better controlling the powder drying effect.

[0046] like Figure 3 As shown, in order to ensure that the hot air inside the positive pressure chamber 24 does not leak out, the present invention designs a heat-insulating door 31 at the positive pressure chamber 24 that can both seal and insulate. The outer frame of the heat-insulating door 31 in the prior art is made of stainless steel metal with high thermal conductivity. When the hot air inside the machine contacts the heat-insulating door 31 plate, it is easy to conduct outward from the stainless steel outer frame of the heat-insulating door 31, resulting in a high heat loss. In order to reduce the leakage of hot air inside the positive pressure chamber 24, an annular heat-insulating plate 32 is provided at the inwardly narrowed part of the door frame of the heat-insulating door 31, and a corresponding annular groove 33 is provided on the positive pressure chamber 24. An annular sealing strip 34 is provided in the annular groove 33. When installed, the annular sealing strip 34 just abuts against the annular heat-insulating plate 32 to form a seal. The thermal insulation door 31 is pressed against the positive pressure chamber 24 with the help of the door handle to ensure that the hot air in the machine will not escape. The inner and outer panels of the thermal insulation door 31 are separated by an annular insulation board 32 with low thermal conductivity and an annular sealing strip 34. In this way, only a small amount of heat can be transferred to the outside of the machine, reducing heat loss and improving drying efficiency.

[0047] like Figure 2 As shown, to facilitate cleaning of the air duct and other components, as well as routine inspections, a platform is required on the frame 11. Conventional platforms typically weld crossbeams 13 to the uprights of the frame 11's side walls, supported by diagonal braces, and then the platform is placed on crossbeams 13. This design takes up a significant amount of side space and is inconvenient to open the side door.

[0048] To solve this problem, the present invention uses a whole rectangular tube as a crossbeam 13 supported on the top of the frame 11. The crossbeam 13 and the frame 11 are connected with bolts. The two ends of the crossbeam 13 protrude from both sides of the frame 11 respectively. The left and right platform units of the on-board platform are directly laid on top of the crossbeam 13. The circulating fan 21, radiator 23 and cleaning port 14 are installed in the middle of the on-board platform, which increases the stability of the crossbeam 13 and the on-board platform. The dehumidification fan 22 is arranged on the side of the on-board platform. In this way, there is no need for diagonal bracing and excessive welding, which increases the operating space on the side and reduces the amount of welding. The on-board platform can be easily disassembled and installed.

[0049] like Figure 4-Figure 6As shown, during the powder drying process, the powder box 12 needs to be installed on the conveyor chain 51 for long-distance transmission in the dryer, and the transmission distance may even vary from tens of meters to hundreds of meters. Therefore, the conveyor chain 51 also has a long length, and the longer conveyor chain 51 requires necessary tensioning during operation. The conveyor chain 51 will also stretch or shorten when the temperature changes. When tensioning, the impact of the length change must also be considered, so it is necessary to design an appropriate tensioning frame 41. In the past, the design of the tensioning frame 41 only considered manual adjustment of the tension. When encountering a conveyor chain 51 with a long adjustment stroke and a heavy load, manual adjustment will be much more difficult. To solve this problem, the present invention has designed an electric adjustment device, which automatically controls the tensioning and relaxation processes and only requires manual start-up.

[0050] Specifically, the frame 11 is provided with a first slide rail 421 extending along the frame 11. A sprocket 52 seat is slidably connected to the first slide rail 421. The sprocket 52 seat is equipped with an outer spherical ball bearing 53 with a slider seat for mounting the sprocket 52. The sprocket 52 cooperates with the conveyor chain 51 for transmission. A drive device is provided on one side of the sprocket 52 seat. The drive device is used to drive the sprocket 52 to slide along the first slide rail 421 to tighten or loosen the conveyor chain 51. An adjustment screw 44 is connected to one side of the sprocket 52. The adjustment screw 44 is sequentially mounted with a spring 43 and a nut. The nut is used to limit the position of the spring 43. The drive device abuts the spring 43. The conveyor chain 51 is pre-tensioned by adjusting the spring 43. By pushing the spring 43 by the drive device, the sprocket 52 tensions the conveyor chain 51.

[0051] However, when the drive device pushes the spring 43 over a long distance, the spring 43 tends to bend, generating lateral force, which increases the friction of the first slide rail 421 and the load on the drive device. Therefore, the present invention provides a second slide rail 422 extending along the frame 11. The second slide rail 422 is slidably connected to the tensioning frame 41. The first slide rail 421 is located on the tensioning frame 41. The tensioning frame 41 is equipped with a baffle that abuts the spring 43 to limit the spring 43. The drive device abuts the tensioning frame 41.

[0052] Preferably, the drive device includes a motor 49, a coupling 48, a bearing seat 47, a push rod 46, and a sleeve 45. The motor 49 and the bearing seat 47 are fixed to the frame 11. The motor 49 is connected to one end of the push rod 46 via the coupling 48. The inner cavity of the sleeve 45 is provided with a trapezoidal internal thread. The other end of the push rod 46 passes through the bearing seat 47 and is threadedly connected to the inner cavity of the sleeve 45. The tensioning frame 41 has a tail slot 411 on the side facing the sleeve 45. The sleeve 45 has a semicircular head at one end, which abuts the tail slot 411. The tail slot 411 structure limits the rotation of the sleeve 45 but does not limit its micro-movement up and down, forward and backward. The semicircular head of the sleeve 45 can compensate for a certain amount of eccentricity.

[0053] When installing the conveyor chain 51, the motor 49 is started. The motor 49 rotates the push rod 46, which drives the sleeve 45 to move linearly on the push rod 46. The sleeve 45 drives the tensioning frame 41 and the sprocket 52 to slide along the second slide rail 422 toward the motor 49, moving the sleeve 45 to the end of the bearing seat 47. At this time, the tensioning frame 41 is in a relaxed state, and the conveyor chain 51 is not tensioned, facilitating the connection of the conveyor chain 51 connector. After the conveyor chain 51 is connected, the motor 49 drives the push rod 46 to rotate in the opposite direction. The push rod 46 pushes the sleeve 45, the tensioning frame 41, and the sprocket 52 to move along the second slide rail 422 away from the motor 49. When the chain is initially tensioned, the conveyor chain 51 pulls on the sprocket 52, so the sprocket 52 no longer moves with the tensioning frame 41. At this time, when the tensioning frame 41 continues to move, the sprocket 52 seat moves on the tensioning frame 41 along the first slide rail 421, and the baffle on the tensioning frame 41 presses against the spring 43 and compresses the spring 43, pushing the sprocket 52 seat to continue to move away from the motor 49 to continuously tighten the conveyor chain 51 until the conveyor chain 51 reaches a predetermined tensioning level.

[0054] To ensure that the tensioning frame 41 does not exceed the adjustment range when loosening or tightening, a limit device is provided on both sides of the tensioning frame 41. The limit device is fixed to the frame 11 and arranged corresponding to the tensioning frame 41. Preferably, the limit device is a micro switch 423.

[0055] The present invention provides double slide rails inside and outside the tensioning frame 41, so that the tensioning frame 41 and the sprocket 52 seat can be horizontally moved and adjusted during the tensioning process, avoiding pushing the spring 43 at the beginning of the tensioning process, and preventing the spring 43 from being pushed over a long distance, which causes the spring 43 to be easily bent and generate lateral force, thereby reducing the friction of the first slide rail 421 and alleviating the load on the motor 49.

[0056] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A flour drying device, comprising a frame provided with a conveyor chain, characterized in that: The rack is equipped with a circulating fan, radiator, positive pressure chamber, negative pressure chamber and return air duct; The circulating fan, radiator, positive pressure bin and negative pressure bin are all installed above the conveyor chain; The air outlet and air inlet of the circulation fan are connected to the upper part of the positive pressure chamber and the negative pressure chamber respectively, and the radiator is arranged between the air outlet of the circulation fan and the positive pressure chamber; The return air duct is located below the conveyor chain, and the bottoms of the positive pressure bin and the negative pressure bin are connected through the return air duct; The frame is equipped with a dehumidification fan, which is connected to the negative pressure chamber. The negative pressure chamber has an air inlet with built-in filter cotton. The frame is provided with a first slide rail extending along the frame direction, the first slide rail is slidably connected to a sprocket that cooperates with the conveyor chain for transmission, and a driving device is provided on one side of the sprocket, which is used to drive the sprocket to slide along the first slide rail; An adjusting screw is connected to one side of the sprocket, a spring and a nut are sequentially sleeved on the adjusting screw, and the driving device abuts against the spring; The frame is provided with a second slide rail extending along the frame direction, the second slide rail is slidably connected to the tensioning frame, the first slide rail is opened on the tensioning frame, the tensioning frame is provided with a baffle, the baffle abuts against the spring, and the driving device abuts against the tensioning frame; The positive pressure chamber is connected to a heat preservation door, and an annular heat insulation plate is provided at the inward narrowing part of the heat preservation door frame. An annular groove is provided on the positive pressure chamber, and an annular sealing strip is provided in the annular groove. The annular sealing strip abuts against the annular heat insulation plate to form a seal; The driving device includes a motor, a coupling, a push rod and a sleeve; the motor is fixed to the frame and connected to one end of the push rod through the coupling, the other end of the push rod is threadedly connected to the inner cavity of the sleeve, and a tail slot is provided on the side of the tensioning frame facing the sleeve, and a semicircular head is provided at one end of the sleeve, which abuts against the tail slot.

2. A noodle drying device according to claim 1, characterized in that: At least two drying bin units are provided on the frame, each drying bin unit includes a circulating fan, a radiator, a positive pressure bin, a negative pressure bin and a return air duct, the dehumidification fan is connected to a dehumidification pipe, and the dehumidification pipes are respectively connected to the negative pressure bins of at least two drying bin units, and an air volume regulating valve is provided at the place where the dehumidification pipe is connected to the negative pressure bin.

3. The noodle drying device according to claim 1, characterized in that: A crossbeam is fixed to the top of the frame, with both ends of the crossbeam protruding from both sides of the frame. An upper platform is provided on the crossbeam, the circulating fan and radiator are arranged in the middle of the upper platform, and the dehumidification fan is arranged on the side of the upper platform.

4. The noodle drying device according to claim 1, characterized in that: Limiting devices are respectively provided on both sides of the tensioning frame. The limiting devices are fixed to the frame and arranged corresponding to the tensioning frame.

Images