Circulating drying device and drying method for standardized processing of radix paeoniae alba

Abstract

The circulating drying device comprises a shell, an air heater, a drying chamber and a drying frame, the air heater is composed of a machine box, an air blower, an electric heating element and a control circuit, and the air heater comprises a vertical air heater installed at the upper end of the shell and transverse air heaters installed on the two sides of the shell; the drying chamber is located in the shell, the rear surface of the drying chamber is fixedly attached to the interior of the shell, a hollow-square-shaped circulating air duct used for hot air circulation is formed by a gap between the drying chamber and the shell, and a lifting mechanism and a diameter changing mechanism are fixedly installed at the upper end of the drying frame. According to the circulating drying device for white peony root standardized processing and the drying method, hot air circulation is achieved through cooperation of a vertical air heater and a transverse air heater and a concentric-square-shaped circulating air duct, a lifting and reducing mechanism is matched to enable a material tray to ascend and descend in a curve mode, local drying non-uniformity is avoided, and it is guaranteed that all parts of white peony roots are evenly heated.

Description

Technical Field

[0001] The invention relates to the technical field of white peony root processing, and in particular to a circulating drying device and a drying method for standardized processing of white peony root. Background Art

[0002] White peony root is a commonly used Chinese medicinal material. Its processing steps are as follows: cleaning - peeling - slicing = drying - screening - packaging. The drying step is crucial to ensuring the quality and efficacy of the medicinal material, and directly affects the quality of white peony root and the retention of its medicinal ingredients.

[0003] Traditional drying methods have many shortcomings. For example, some simple drying equipment uses a single-direction hot air supply, and the hot air cannot evenly cover all parts of the white peony being dried, resulting in over-drying of the part close to the hot air source and insufficient drying of the part far from the hot air source. This uneven drying condition not only affects the appearance quality of the white peony, but may also affect its intrinsic quality and medicinal ingredients due to local moisture residue or over-drying.

[0004] Secondly, during the drying process, white peony root is usually placed on a relatively fixed drying rack, which is not conducive to uniform heating. As the drying time goes by, this fixed placement will aggravate the uneven drying phenomenon and reduce the overall quality of the product.

[0005] In summary, we propose a circulating drying device and drying method for standardized processing of white peony root to solve the above-mentioned problems. Summary of the invention

[0006] The purpose of the present invention is to provide a circulating drying device and drying method for standardized processing of white peony root, which realizes hot air circulation through the cooperation of vertical and horizontal hot air blowers and a U-shaped circulating air duct, and cooperates with the lifting and reducing mechanism to make the supporting plate rise and fall in a curve, so as to avoid local uneven drying, ensure that all parts of the white peony root are evenly heated, and improve the drying quality.

[0007] To achieve the above object, the present invention proposes the following scheme:

[0008] A circulating drying device for standardized processing of white peony root comprises a housing, a hot air blower, a drying chamber and a drying rack, wherein the hot air blower is composed of a housing, a blower, an electric heating element and a control circuit;

[0009] The hot air blower includes a vertical hot air blower installed at the upper end of the shell and a horizontal hot air blower installed at both sides of the shell. The hot air blower is used to heat the air and transport the high-temperature air to the inside of the drying chamber to dry the white peony. The wind force of the vertical hot air blower is higher than the wind force of the horizontal hot air blower.

[0010] The drying chamber is located inside the shell, and its rear surface is fixedly attached to the inside of the shell, and the gap between the drying chamber and the shell forms a U-shaped circulation air duct for hot air circulation;

[0011] A lifting mechanism and a reducing mechanism are fixedly installed on the upper end of the drying rack. A supporting tray that can be lifted and lowered in a curve is also arranged on the upper end of the drying rack. The lifting mechanism and the reducing mechanism cooperate to lift and lower the supporting tray in a curve so that the white peony root carried inside the supporting tray is evenly heated.

[0012] A vertical air outlet is provided on the upper surface of the shell for conveying the hot air generated by the vertical hot air blower from above to the inside of the circulating air duct. Horizontal air outlets are provided on both sides of the shell for conveying the hot air generated by the horizontal hot air blower from both sides to the inside of the circulating air duct.

[0013] A vertical air inlet is provided on the upper surface of the drying chamber for receiving hot air from above, and horizontal air inlets are provided on the surfaces of both sides of the drying chamber for receiving hot air from both sides.

[0014] A universal wheel is installed at the lower end of the drying rack, and a push-pull rod is installed at the front side of the upper end of the drying rack. The push-pull rod cooperates with the universal wheel to facilitate use by staff.

[0015] A motor, a lead screw and a lifting block are installed inside the lifting mechanism. The motor is transmission-connected to the lead screw, and the outer surface of the lead screw is threadedly connected to the lifting block.

[0016] A support rod for supporting the support tray is fixedly connected to the outer surface of the lifting block, a slide groove is provided on the upper surface of the support rod, a slider is slidably connected inside the slide groove, and the upper end of the slider is fixedly connected to the support tray.

[0017] A curved serpentine groove is provided on the front surface of the diameter-changing mechanism, and a lifting roller rolls inside the serpentine groove.

[0018] The outer end of the lifting roller is rotatably connected with a connecting plate, one side of the supporting tray is fixedly connected with the connecting plate, and a plurality of air holes are opened on the bottom surface of the supporting tray.

[0019] The present invention provides a method for circulating and drying white peony root:

[0020] Step 1: Spread the sliced ​​white peony slices evenly on the tray with a stacking thickness of 1-2 cm, push the drying rack into the drying room, and close the door.

[0021] Step 2: Start the vertical hot air blower and the horizontal hot air blower to perform the heating operation. The vertical hot air blower fan speed is set to 800 rpm, the air supply is 1800 cubic meters per hour, the horizontal hot air blower speed is set to 600 / minute, the air supply is 1200 cubic meters per hour, and the heating rate is controlled at 1-2° per minute. The heating power of the electric heating element is 3 kilowatts. The heating wire of the electric heating element is made of nickel-chromium alloy with a resistance value of 30 ohms. It can quickly and stably convert electrical energy into thermal energy, so that the air temperature rises evenly.

[0022] Step 3: After the temperature inside the drying chamber reaches 45°, the temperature rise is stopped, the heating element provides heat stably, and the temperature fluctuation range is controlled within ±1°C. At this time, the heating power of the hot air blower is adjusted to 2 kilowatts to maintain a stable temperature. A high-precision temperature sensor is installed inside the drying chamber 2 with a measurement accuracy of ±0.5°C. It can monitor the temperature changes inside the drying chamber in real time and feed back the signal to the control circuit. The control circuit accurately adjusts the power of the heating element according to the feedback signal to ensure temperature stability.

[0023] Step 4: Increase the speed of the hot air blower fan. The speed of the vertical hot air blower fan is increased to 1500 rpm, the air supply volume is increased to 3200 cubic meters per hour, the speed of the horizontal hot air blower is increased to 1200 / minute, and the air supply volume is increased to 2400 cubic meters per hour. The wind force generated by the vertical hot air blower blows the air inside the drying room back to the circulating air duct through the hot air outlet, and then is blown back to the drying room by the horizontal hot air blower through the vertical air inlet to achieve circulating drying. The hot air speed in the circulating air duct 13 is 2 meters per second, and the wind pressure in the air duct is 300 Pascals, which can ensure that the hot air flows smoothly in the circulating air duct and can effectively transfer heat to the white peony root.

[0024] Step 5: When the hot air blower is started, the motor is started synchronously. The motor drives the lifting block and the supporting rod to lift and lower back and forth through the screw rod. The lifting speed is 10 cm per minute, so that the supporting tray supported by the supporting rod can lift and lower back and forth. Such a lifting speed can ensure that the white peony is evenly heated, and will not cause the white peony slices to shift in the supporting tray due to too fast lifting.

[0025] Step 6: When the support tray is lifted and lowered back and forth, the position and height of the support tray are constantly changed through the slider and the serpentine groove curve, so as to achieve uniform heating and maintain constant drying speed for 4 hours.

[0026] Step 7: After constant speed drying, enter the speed reduction drying stage, slowly reduce the temperature inside the drying chamber to 35°, the cooling rate is 0.5° per minute, reduce the vertical hot air fan speed to 600 rpm, the air supply volume to 1000 cubic meters per hour, reduce the horizontal hot air fan speed to 400 / minute, the air supply volume to 800 cubic meters per hour, and finish drying for 2 hours.

[0027] Step 8: After the final drying is completed, stop heating and continue to run the fan to ensure humidity until the drying room reaches room temperature, open the door, collect the materials, and end the drying.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] (1) The circulating drying device and drying method for standardized processing of white peony root of the present invention realizes the circulation of hot air in the drying chamber through the cooperation of the vertical hot air blower and the horizontal hot air blower and the unique U-shaped circulating air duct. The hot air can fully contact the white peony root from different directions and angles, avoiding the problem of partial over-drying or under-drying existing in the traditional drying method.

[0030] (2) In the present invention, a circulating drying device and drying method for standardized processing of white peony root are provided, wherein the lifting mechanism and the diameter-changing mechanism cooperate to enable the support plate to be lifted and lowered in a curved shape. During the drying process, the support plate continuously changes position and height, further enhancing the uniformity of heating of the white peony root, so that all parts of the white peony root can be fully dried during the entire drying process.

[0031] (3) The present invention provides a circulating drying device and drying method for standardized processing of white peony root. The hot air circulation system of the device enables the hot air in the drying room to be continuously circulated and used, and the heat is fully utilized. The vertical hot air blower blows the hot air inside the drying room back to the circulating air duct, and then the horizontal hot air blower blows it back to the drying room. This circulation method reduces heat loss, reduces energy consumption, improves energy utilization efficiency, and has a good energy-saving effect.

[0032] (4) The circulating drying device and drying method for standardized processing of white peony root of the present invention have a heating rate controlled at 1-2° per minute, and a temperature fluctuation range in the constant temperature stage controlled within ±1°C. The drying temperature can be precisely adjusted according to the characteristics of white peony root and drying requirements, which is beneficial to ensuring that the medicinal ingredients of white peony root are not destroyed and improving the product quality.

[0033] (5) In the circulating drying device and drying method for standardized processing of white peony root of the present invention, the wind speed of the vertical hot air blower and the horizontal hot air blower can be reasonably adjusted in different drying stages. By adjusting the fan speed in different stages such as heating, constant speed drying and speed reduction drying, the flow speed and intensity of the hot air can be accurately controlled to meet the drying requirements of different stages, thereby further ensuring the accuracy of the drying process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the overall appearance of the present invention;

[0035] Figure 2 A schematic diagram of the overall interior of the present invention;

[0036] Figure 3 It is a schematic diagram of the interior of the drying chamber of the present invention;

[0037] Figure 4 It is a schematic diagram of the housing and the air outlet position of the drying chamber of the present invention;

[0038] Figure 5 It is a schematic diagram of the hot air circulation trend of the present invention;

[0039] Figure 6 It is a schematic diagram of the drying rack structure of the present invention;

[0040] Figure 7 It is a schematic diagram of the lifting mechanism and the diameter-changing mechanism structure of the present invention;

[0041] Figure 8 It is a schematic diagram of the supporting tray structure of the present invention.

[0042] In the figure:

[0043] 1. Shell; 11. Vertical hot air blower; 111. Vertical air outlet; 12. Horizontal hot air blower; 121. Horizontal air outlet; 13. Circulation air duct;

[0044] 2. Drying room; 21. Vertical air inlet; 22. Horizontal air inlet; 23. Hot air outlet;

[0045] 3. Drying rack; 31. Universal wheel; 32. Push-pull rod;

[0046] 33. lifting mechanism; 331. motor; 332. screw rod; 333. lifting block; 334. supporting rod; 3341. slideway; 3342. slider;

[0047] 34. Variable diameter mechanism; 341. Serpentine groove; 342. Lifting roller;

[0048] 35. Support tray; 351. Connecting plate; 352. Air vent. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] See also Figure 1-8 , a circulating drying device for standardized processing of white peony root, comprising a housing 1, a hot air blower, a drying chamber 2 and a drying rack 3, wherein the hot air blower is composed of a chassis, a blower, an electric heating element and a control circuit;

[0051] The hot air blower includes a vertical hot air blower 11 installed at the upper end of the housing 1 and a horizontal hot air blower 12 installed at both sides of the housing 1. The hot air blower is used to heat the air and transport the high-temperature air to the drying chamber 2 to dry the white peony root. The wind force of the vertical hot air blower 11 is higher than the wind force of the horizontal hot air blower 12.

[0052] The drying chamber 2 is located inside the outer shell 1, and its rear surface is fixedly attached to the inner part of the outer shell 1. The gap between the drying chamber 2 and the outer shell 1 forms a U-shaped circulation air duct 13 for hot air circulation;

[0053] A lifting mechanism 33 and a reducing mechanism 34 are fixedly installed on the upper end of the drying rack 3. A supporting tray 35 that can be lifted and lowered in a curve is also provided on the upper end of the drying rack 3. The lifting mechanism 33 and the reducing mechanism 34 cooperate to lift and lower the supporting tray 35 in a curve so that the white peony carried inside the supporting tray 35 is evenly heated. When in use, the wind force of the vertical hot air blower 11 is greater than the wind force of the horizontal hot air blower 12. Specifically, in the heating operation stage, the fan speed of the vertical hot air fan 11 is set to 800 rpm, the air supply volume is 1800 cubic meters / hour, and the speed of the horizontal hot air fan 12 is set to 600 rpm, and the air supply volume is 1200 cubic meters / hour; when entering the circulation drying stage, the fan speed of the vertical hot air fan 11 is increased to 1500 rpm, the air supply volume is increased to 3200 cubic meters / hour, and the speed of the horizontal hot air fan 12 is increased to 1200 rpm, and the air supply volume is increased to 2400 cubic meters / hour. Under the effect of such wind force difference, the hot air inside the drying chamber 2 will be blown back into the circulating air duct 13 from the hot air outlet 23. At this time, the hot air reflux speed at the hot air outlet 23 is about 3.8 meters / second. Then, when the hot air circulates in the circulating air duct 13 to the cross wind inlet 22, it is blown back into the drying chamber 2 by the cross wind blower 12. The air inlet speed at the cross wind inlet 22 is about 3.2 m / s. The wind direction is as follows: Figure 5 As shown, through such an arrangement, hot air circulation is achieved, so that the hot air circulates in the drying chamber 2 in a relatively stable and uniform state, and can fully contact the white peony root from different directions and angles. Under the continuous blowing of hot air, all parts of the white peony root can be heated evenly, avoiding problems such as local over-drying (such as excessive local temperature causing burning of the white peony root, loss of effective ingredients, etc.) or local under-drying (such as excessive local moisture residue, affecting storage and subsequent processing, etc.), thereby effectively ensuring the quality and effect of drying the white peony root.

[0054] Furthermore, a vertical air outlet 111 is provided on the upper surface of the shell 1 for conveying the hot air generated by the vertical hot air blower 11 to the inside of the circulating air duct 13 from above, and horizontal air outlets 121 are provided on both side surfaces of the shell 1 for conveying the hot air generated by the horizontal hot air blower 12 to the inside of the circulating air duct 13 from both sides. When the drying work starts, the vertical hot air blower 11 and the horizontal hot air blower 12 are started at the same time to heat the air. At this time, the fan speed of the vertical hot air blower 11 is set to 800 rpm, and the air supply volume is 1800 cubic meters per hour. The temperature of the hot air generated by it gradually rises at a heating rate of 1-2° per minute. The vertical hot air blower 11 will convey the hot air to the inside of the circulating air duct 13 through the vertical air outlet 111 at a wind speed of about 2.5 m / s. At the same time, the speed of the horizontal hot air blower 12 is set to 600 rpm, and the air supply volume is 1200 cubic meters per hour. The hot air generated also rises at a heating rate of 1-2° per minute. The temperature is gradually increased at a rate of 2°. The transverse hot air blower 12 will transport the hot air to the inside of the circulating air duct 13 through the transverse air outlet 121 at a wind speed of about 1.8 m / s. Such parameter settings can make the hot air enter the circulating air duct 13 more evenly and stably, providing a suitable hot air environment for subsequent drying work.

[0055] Furthermore, a vertical wind inlet 21 is provided on the upper surface of the drying chamber 2 for receiving hot air from above, and transverse wind inlets 22 are provided on the two side surfaces of the drying chamber 2 for receiving hot air from both sides. After the heated air enters the circulating air duct 13, it is affected by the wind pressure (at this time, the wind pressure in the circulating air duct 13 is about 250 Pascals), and continues to enter the drying chamber 2 through the vertical wind inlet 21 and the transverse wind inlet 22 to heat the white peony in the supporting tray 35. The hot air speed entering the drying chamber 2 from the vertical wind inlet 21 is about 2.2 m / s, and the hot air speed entering the drying chamber 2 from the transverse wind inlet 22 is about 1.6 m / s. Such a wind speed setting can ensure that the hot air covers the white peony in the supporting tray 35 more evenly, thereby realizing a stable and effective heating and drying process.

[0056] Furthermore, a universal wheel 31 is installed at the lower end of the drying rack 3, and a push-pull rod 32 is installed at the front side of the upper end of the drying rack 3. The push-pull rod 32 cooperates with the universal wheel 31 to facilitate use by the staff. When in use, the staff can flexibly operate the drying rack 3 through the push-pull rod 32 and the universal wheel 31.

[0057] Furthermore, a motor 331, a screw rod 332 and a lifting block 333 are installed inside the lifting mechanism 33. The motor 331 is transmission-connected to the screw rod 332, and the outer surface of the screw rod 332 is threadedly connected to the lifting block 333. When drying, the motor 331 inside the lifting mechanism 33 is started, and the rated speed of the motor 331 is set to 1200 rpm. The motor 331 drives the screw rod 332 to rotate at a speed of 30 rpm. The pitch of the screw rod 332 is 5 mm. For each rotation, the lifting block 333 moves 5 mm axially on the screw rod 332. As the screw rod 332 rotates, the lifting block 333 is lifted and lowered at a speed of 15 cm per minute, thereby driving the support rod 334 and the supporting tray 35 to rise and fall synchronously. The supporting tray 35 is controlled by the motor 331 to perform reciprocating lifting and lowering. The lifting stroke is set to 30 cm, and each lifting cycle is 6 minutes (3 minutes for rising and 3 minutes for falling), so that the supporting tray 35 can continuously change its height. Such numerical parameter settings can keep the support tray 35 in a suitable state of movement in the drying chamber, so that the white peony in the support tray 35 is evenly heated at different heights, further achieving the purpose of uniform heating, effectively avoiding the problem of uneven local heating caused by fixed position, and improving the quality and effect of drying the white peony.

[0058] Furthermore, a support rod 334 for supporting the support tray 35 is fixedly connected to the outer surface of the lifting block 333, and a slide groove 3341 is provided on the upper surface of the support rod 334. A slider 3342 is slidably connected inside the slide groove 3341. The upper end of the slider 3342 is fixedly connected to the support tray 35. When in use, the support tray 35 is lifted and lowered reciprocatingly. Figure 6 As shown, its lifting trajectory is affected by the serpentine groove 341 and performs a curved lifting. When the supporting tray 35 is lifted or lowered, the slider 3342 at the lower end continuously slides inside the slide groove 3341 and will not be limited.

[0059] Furthermore, a curved serpentine groove 341 is provided on the front surface of the diameter-changing mechanism 34, and a lifting roller 342 rolls inside the serpentine groove 341. When in use, when the supporting tray 35 is lifted and lowered through the serpentine groove 341, the lifting roller 342 connected to the supporting tray 35 by rotation through the connecting plate 351 rolls inside the serpentine groove 341, thereby reducing wear during lifting and lowering.

[0060] Furthermore, the outer end of the lifting roller 342 is rotatably connected to a connecting plate 351, one side of the supporting tray 35 is fixedly connected to the connecting plate 351, and a plurality of air holes 352 are provided on the bottom surface of the supporting tray 35. When in use, the air holes 352 can enhance the heating effect of the white peony inside the supporting tray 35.

[0061] A circulating drying method for white peony root, comprising:

[0062] Step 1: Evenly spread the sliced ​​white peony root slices in the support tray 35 to a stacking thickness of 1-2 cm, push the drying rack 3 into the drying chamber 2, and close the door.

[0063] Step 2: Start the vertical hot air blower 11 and the horizontal hot air blower 12 to perform heating operation. The fan speed of the vertical hot air blower 11 is set to 800 rpm, and the air supply is 1800 cubic meters per hour. The speed of the horizontal hot air blower 12 is set to 600 / minute, and the air supply is 1200 cubic meters per hour. The heating rate is controlled at 1-2° per minute. The heating power of the electric heating element is 3 kilowatts. The heating wire of the electric heating element is made of nickel-chromium alloy with a resistance value of 30 ohms. It can quickly and stably convert electrical energy into thermal energy to make the air temperature rise evenly.

[0064] Step 3: After the internal temperature of the drying chamber 2 reaches 45°, the temperature rise is stopped, the heating element provides heat stably, and the temperature fluctuation range is controlled within ±1°C. At this time, the heating power of the hot air blower is adjusted to 2 kilowatts to maintain a stable temperature. A high-precision temperature sensor is installed inside the drying chamber 2 with a measurement accuracy of ±0.5°C. It can monitor the temperature changes inside the drying chamber in real time and feed the signal back to the control circuit. The control circuit accurately adjusts the power of the heating element according to the feedback signal to ensure temperature stability.

[0065] Step 4: Increase the speed of the hot air blower fan. The speed of the vertical hot air blower 11 is increased to 1500 rpm, and the air supply volume is increased to 3200 cubic meters per hour. The speed of the horizontal hot air blower 12 is increased to 1200 / minute, and the air supply volume is increased to 2400 cubic meters per hour. The wind force generated by the vertical hot air blower 11 blows the air inside the drying chamber 2 back to the circulating air duct 13 through the hot air outlet 23, and then is blown back into the drying chamber 2 through the vertical air inlet 21 by the horizontal hot air blower 12 to realize circulating drying. The hot air speed in the circulating air duct 13 is 2 meters per second, and the wind pressure in the air duct is 300 Pascals, which can ensure that the hot air flows smoothly in the circulating air duct and can effectively transfer heat to the white peony.

[0066] Step 5: When the hot air blower is started, the motor 331 is started synchronously. The motor 331 drives the lifting block 333 and the supporting rod 334 to lift and lower back and forth through the screw rod 332. The lifting speed is 10 cm per minute, so that the supporting tray 35 supported by the supporting rod 334 lifts and lowers back and forth. Such a lifting speed can ensure that the white peony root is evenly heated, and will not cause the white peony root slices to shift in the supporting tray due to too fast lifting.

[0067] Step 6: When the support tray 35 is lifted and lowered back and forth, the support tray 35 continuously changes position and height through the slider 3342 and the serpentine groove 341 to achieve uniform heating and maintain constant drying speed for 4 hours.

[0068] Step 7: After constant speed drying, enter the speed reduction drying stage, slowly reduce the internal temperature of the drying chamber 2 to 35°, the cooling rate is 0.5° per minute, reduce the vertical hot air blower 11 wind speed to 600 rpm, and the air supply volume is reduced to 1000 cubic meters per hour. Reduce the horizontal hot air blower 12 wind speed to 400 / minute, and the air supply volume is reduced to 800 cubic meters per hour. Finish drying for 2 hours.

[0069] Step 8: After the final drying is completed, stop heating and continue to run the fan to ensure humidity until the drying chamber 2 reaches room temperature, open the door, collect the materials, and end the drying.

[0070] In summary, the present invention proposes a circulating drying device and a drying method for standardized processing of white peony root. When in use, the electric heating elements in the vertical hot air blower 11 and the horizontal hot air blower 12 heat the air, and the blower sends the hot air into the U-shaped circulating air duct 13 between the shell 1 and the drying chamber 2 through the vertical air outlet 111 and the horizontal air outlet 121, and then enters the drying chamber 2 through the vertical air inlet 21 and the horizontal air inlet 22 to dry the white peony root in the support tray 35. Since the vertical hot air blower 11 has a stronger wind force than the horizontal hot air blower 12, the hot air in the drying chamber 2 will be blown back into the circulating air duct 13 through the hot air outlet 23, and then the hot air will be blown back into the circulating air duct 13 through the horizontal hot air outlet 23. The hot air blower 12 blows back to the drying chamber 2 to form a hot air circulation to ensure that all parts of the white peony are evenly heated. At the same time, the motor 331 of the lifting mechanism 33 drives the screw rod 332 to rotate, so that the lifting block 333 and the supporting rod 334 drive the supporting tray 35 to rise and fall, and the serpentine groove 341 of the variable diameter mechanism 34 cooperates with the lifting roller 342 to make the supporting tray 35 rise and fall in a curve, constantly changing the position and height, and further enhancing the uniformity of heating. During the drying process, the temperature and wind speed of the hot air blower are accurately controlled by the control circuit, and the hot air circulation system and the dynamic adjustment system of the supporting tray 35 work together to achieve standardized and high-quality drying of the white peony.

Claims

1. A circulating drying device for standardized processing of white peony root, comprising a housing (1), a hot air blower, a drying chamber (2) and a drying rack (3), wherein the hot air blower is composed of a housing, a blower, an electric heating element and a control circuit; Features: The hot air blower comprises a vertical hot air blower (11) installed at the upper end of the housing (1) and a horizontal hot air blower (12) installed at both sides of the housing (1), the hot air blower is used to heat air and transport the high-temperature air to the inside of the drying chamber (2) to dry the white peony root, and the wind force of the vertical hot air blower (11) is higher than the wind force of the horizontal hot air blower (12); The drying chamber (2) is located inside the outer shell (1), and its rear surface is fixedly attached to the inside of the outer shell (1), and the gap between the drying chamber (2) and the outer shell (1) forms a U-shaped circulation air duct (13) for hot air circulation; A lifting mechanism (33) and a diameter-changing mechanism (34) are fixedly mounted on the upper end of the drying rack (3). A supporting tray (35) that can be lifted and lowered in a curved shape is also arranged on the upper end of the drying rack (3). The lifting mechanism (33) and the diameter-changing mechanism (34) cooperate to lift and lower the supporting tray (35) in a curved shape, so that the white peony root carried in the supporting tray (35) is evenly heated.

2. A circulating drying device for standardized processing of white peony root according to claim 1, characterized in that: The upper surface of the outer shell (1) is provided with a vertical air outlet (111) for conveying hot air generated by the vertical hot air blower (11) from above to the inside of the circulating air duct (13); the surfaces of both sides of the outer shell (1) are provided with horizontal air outlets (121) for conveying hot air generated by the horizontal hot air blower (12) from both sides to the inside of the circulating air duct (13).

3. A circulating drying device for standardized processing of white peony root according to claim 2, characterized in that: A vertical air inlet (21) is provided on the upper surface of the drying chamber (2) for receiving hot air from above, and horizontal air inlets (22) are provided on the two side surfaces of the drying chamber (2) for receiving hot air from both sides.

4. A circulating drying device for standardized processing of white peony root according to claim 3, characterized in that: A universal wheel (31) is installed at the lower end of the drying rack (3), and a push-pull rod (32) is installed at the front side of the upper end of the drying rack (3). The push-pull rod (32) cooperates with the universal wheel (31) to facilitate use by staff.

5. A circulating drying device for standardized processing of white peony root according to claim 4, characterized in that: A motor (331), a screw rod (332) and a lifting block (333) are installed inside the lifting mechanism (33); the motor (331) is transmission-connected to the screw rod (332); and the outer surface of the screw rod (332) is threadedly connected to the lifting block (333).

6. A circulating drying device for standardized processing of white peony root according to claim 5, characterized in that: A support rod (334) for supporting the material support tray (35) is fixedly connected to the outer surface of the lifting block (333), a slide groove (3341) is provided on the upper surface of the support rod (334), a slider (3342) is slidably connected inside the slide groove (3341), and the upper end of the slider (3342) is fixedly connected to the material support tray (35).

7. A circulating drying device for standardized processing of white peony root according to claim 6, characterized in that: A curved serpentine groove (341) is provided on the front surface of the diameter-changing mechanism (34), and a lifting roller (342) rolls inside the serpentine groove (341).

8. A circulating drying device for standardized processing of white peony root according to claim 7, characterized in that: The outer end of the lifting roller (342) is rotatably connected to a connecting plate (351), one side of the supporting tray (35) is fixedly connected to the connecting plate (351), and a plurality of air holes (352) are provided on the bottom surface of the supporting tray (35).

9. A circulation drying method for white peony root, characterized in that: include: Step 1: evenly spread the sliced ​​white peony root slices in the support tray (35) to a stacking thickness of 1-2 cm, push the drying rack (3) into the drying chamber (2), and close the door. Step 2: Start the vertical hot air blower (11) and the horizontal hot air blower (12) to perform a heating operation. The vertical hot air blower (11) fan speed is set to 800 revolutions per minute, and the air supply volume is 1800 cubic meters per hour. The horizontal hot air blower (12) speed is set to 600 revolutions per minute, and the air supply volume is 1200 cubic meters per hour. The heating speed is controlled at 1-2 degrees per minute. The heating power of the electric heating element is 3 kilowatts. The heating wire of the electric heating element is made of nickel-chromium alloy, and its resistance value is 30 ohms. It can quickly and stably convert electrical energy into thermal energy, so that the air temperature rises evenly. Step 3: After the temperature inside the drying chamber (2) reaches 45°, the temperature rise is stopped, the heating element provides heat stably, and the temperature fluctuation range is controlled within ±1°C. At this time, the heating power of the hot air blower is adjusted to 2 kW to maintain a stable temperature. A high-precision temperature sensor is installed inside the drying chamber 2 with a measurement accuracy of ±0.5°C. It can monitor the temperature changes inside the drying chamber in real time and feed back the signal to the control circuit. The control circuit accurately adjusts the power of the heating element according to the feedback signal to ensure temperature stability. Step 4: Increase the speed of the hot air blower. The speed of the vertical hot air blower (11) is increased to 1500 revolutions per minute, and the air supply volume is increased to 3200 cubic meters per hour. The speed of the horizontal hot air blower (12) is increased to 1200 revolutions per minute, and the air supply volume is increased to 2400 cubic meters per hour. The wind force generated by the vertical hot air blower (11) blows the air inside the drying chamber (2) back to the circulating air duct (13) through the hot air outlet (23), and then is blown back into the drying chamber (2) by the horizontal hot air blower (12) through the vertical air inlet (21) to achieve circulating drying. The hot air speed in the circulating air duct 13 is 2 meters per second, and the wind pressure in the air duct is 300 Pascals, which can ensure that the hot air flows smoothly in the circulating air duct and can effectively transfer heat to the white peony root. Step 5: When the hot air blower is started, the motor (331) is started synchronously. The motor (331) drives the lifting block (333) and the supporting rod (334) to lift and lower back and forth through the screw rod (332). The lifting speed is 10 cm per minute, so that the supporting tray (35) supported by the supporting rod (334) lifts and lowers back and forth. Such a lifting speed can ensure that the white peony root is evenly heated, and will not cause the white peony root slices to shift in the supporting tray due to excessive lifting. Step 6: When the support plate (35) is lifted and lowered reciprocatingly, the support plate (35) is lifted and lowered in a curve through the slider (3342) and the serpentine groove (341), and the position and height of the support plate (35) are constantly changed to achieve uniform heating and maintain a constant drying speed for 4 hours. Step 7: After constant speed drying, enter the speed reduction drying stage, slowly reduce the internal temperature of the drying chamber (2) to 35°, the cooling rate is 0.5° per minute, reduce the wind speed of the vertical hot air blower (11) to 600 rpm, reduce the air supply volume to 1000 cubic meters per hour, reduce the wind speed of the horizontal hot air blower (12) to 400 / minute, reduce the air supply volume to 800 cubic meters per hour, and finish drying for 2 hours. Step 8: After the drying is finished, stop heating and continue to run the fan to ensure humidity until the drying chamber (2) reaches room temperature. Then open the door, collect the materials, and end the drying.

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